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tor/src/or/or.h

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/* Copyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2012, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file or.h
* \brief Master header file for Tor-specific functionality.
**/
#ifndef TOR_OR_H
#define TOR_OR_H
#include "orconfig.h"
#ifdef __COVERITY__
/* If we're building for a static analysis, turn on all the off-by-default
* features. */
#ifndef INSTRUMENT_DOWNLOADS
#define INSTRUMENT_DOWNLOADS 1
#endif
#endif
#ifdef _WIN32
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0501
#endif
#define WIN32_LEAN_AND_MEAN
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h> /* FreeBSD needs this to know what version it is */
#endif
#include "torint.h"
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_SYS_FCNTL_H
#include <sys/fcntl.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_ASSERT_H
#include <assert.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifdef _WIN32
#include <io.h>
#include <process.h>
#include <direct.h>
#include <windows.h>
#define snprintf _snprintf
#endif
#ifdef USE_BUFFEREVENTS
#include <event2/bufferevent.h>
#include <event2/buffer.h>
#include <event2/util.h>
#endif
#include "crypto.h"
#include "tortls.h"
#include "../common/torlog.h"
#include "container.h"
#include "torgzip.h"
#include "address.h"
#include "compat_libevent.h"
#include "ht.h"
#include "replaycache.h"
/* These signals are defined to help handle_control_signal work.
*/
#ifndef SIGHUP
#define SIGHUP 1
#endif
#ifndef SIGINT
#define SIGINT 2
#endif
#ifndef SIGUSR1
#define SIGUSR1 10
#endif
#ifndef SIGUSR2
#define SIGUSR2 12
#endif
#ifndef SIGTERM
#define SIGTERM 15
#endif
/* Controller signals start at a high number so we don't
* conflict with system-defined signals. */
#define SIGNEWNYM 129
#define SIGCLEARDNSCACHE 130
#if (SIZEOF_CELL_T != 0)
/* On Irix, stdlib.h defines a cell_t type, so we need to make sure
* that our stuff always calls cell_t something different. */
#define cell_t tor_cell_t
#endif
#ifdef ENABLE_TOR2WEB_MODE
#define NON_ANONYMOUS_MODE_ENABLED 1
#endif
/** Length of longest allowable configured nickname. */
#define MAX_NICKNAME_LEN 19
/** Length of a router identity encoded as a hexadecimal digest, plus
* possible dollar sign. */
#define MAX_HEX_NICKNAME_LEN (HEX_DIGEST_LEN+1)
/** Maximum length of verbose router identifier: dollar sign, hex ID digest,
* equal sign or tilde, nickname. */
#define MAX_VERBOSE_NICKNAME_LEN (1+HEX_DIGEST_LEN+1+MAX_NICKNAME_LEN)
/** Maximum size, in bytes, for resized buffers. */
#define MAX_BUF_SIZE ((1<<24)-1) /* 16MB-1 */
/** Maximum size, in bytes, for any directory object that we've downloaded. */
#define MAX_DIR_DL_SIZE MAX_BUF_SIZE
/** For HTTP parsing: Maximum number of bytes we'll accept in the headers
* of an HTTP request or response. */
#define MAX_HEADERS_SIZE 50000
/** Maximum size, in bytes, for any directory object that we're accepting
* as an upload. */
#define MAX_DIR_UL_SIZE MAX_BUF_SIZE
/** Maximum size, in bytes, of a single router descriptor uploaded to us
* as a directory authority. Caches and clients fetch whatever descriptors
* the authorities tell them to fetch, and don't care about size. */
#define MAX_DESCRIPTOR_UPLOAD_SIZE 20000
/** Maximum size of a single extrainfo document, as above. */
#define MAX_EXTRAINFO_UPLOAD_SIZE 50000
/** How long do we keep DNS cache entries before purging them (regardless of
* their TTL)? */
#define MAX_DNS_ENTRY_AGE (30*60)
/** How long do we cache/tell clients to cache DNS records when no TTL is
* known? */
#define DEFAULT_DNS_TTL (30*60)
/** How long can a TTL be before we stop believing it? */
#define MAX_DNS_TTL (3*60*60)
/** How small can a TTL be before we stop believing it? Provides rudimentary
* pinning. */
#define MIN_DNS_TTL 60
/** How often do we rotate onion keys? */
#define MIN_ONION_KEY_LIFETIME (7*24*60*60)
/** How often do we rotate TLS contexts? */
#define MAX_SSL_KEY_LIFETIME_INTERNAL (2*60*60)
/** What expiry time shall we place on our SSL certs? */
#define MAX_SSL_KEY_LIFETIME_ADVERTISED (365*24*60*60)
/** How old do we allow a router to get before removing it
* from the router list? In seconds. */
#define ROUTER_MAX_AGE (60*60*48)
/** How old can a router get before we (as a server) will no longer
* consider it live? In seconds. */
#define ROUTER_MAX_AGE_TO_PUBLISH (60*60*24)
/** How old do we let a saved descriptor get before force-removing it? */
#define OLD_ROUTER_DESC_MAX_AGE (60*60*24*5)
/** Possible rules for generating circuit IDs on an OR connection. */
typedef enum {
CIRC_ID_TYPE_LOWER=0, /**< Pick from 0..1<<15-1. */
CIRC_ID_TYPE_HIGHER=1, /**< Pick from 1<<15..1<<16-1. */
/** The other side of a connection is an OP: never create circuits to it,
* and let it use any circuit ID it wants. */
CIRC_ID_TYPE_NEITHER=2
} circ_id_type_t;
#define CONN_TYPE_MIN_ 3
/** Type for sockets listening for OR connections. */
#define CONN_TYPE_OR_LISTENER 3
/** A bidirectional TLS connection transmitting a sequence of cells.
* May be from an OR to an OR, or from an OP to an OR. */
#define CONN_TYPE_OR 4
/** A TCP connection from an onion router to a stream's destination. */
#define CONN_TYPE_EXIT 5
/** Type for sockets listening for SOCKS connections. */
#define CONN_TYPE_AP_LISTENER 6
/** A SOCKS proxy connection from the user application to the onion
* proxy. */
#define CONN_TYPE_AP 7
/** Type for sockets listening for HTTP connections to the directory server. */
#define CONN_TYPE_DIR_LISTENER 8
/** Type for HTTP connections to the directory server. */
#define CONN_TYPE_DIR 9
/** Connection from the main process to a CPU worker process. */
#define CONN_TYPE_CPUWORKER 10
/** Type for listening for connections from user interface process. */
#define CONN_TYPE_CONTROL_LISTENER 11
/** Type for connections from user interface process. */
#define CONN_TYPE_CONTROL 12
/** Type for sockets listening for transparent connections redirected by pf or
* netfilter. */
#define CONN_TYPE_AP_TRANS_LISTENER 13
/** Type for sockets listening for transparent connections redirected by
* natd. */
#define CONN_TYPE_AP_NATD_LISTENER 14
/** Type for sockets listening for DNS requests. */
#define CONN_TYPE_AP_DNS_LISTENER 15
#define CONN_TYPE_MAX_ 15
/* !!!! If CONN_TYPE_MAX_ is ever over 15, we must grow the type field in
* connection_t. */
/* Proxy client types */
#define PROXY_NONE 0
#define PROXY_CONNECT 1
#define PROXY_SOCKS4 2
#define PROXY_SOCKS5 3
/* !!!! If there is ever a PROXY_* type over 2, we must grow the proxy_type
* field in or_connection_t */
/* pluggable transports proxy type */
#define PROXY_PLUGGABLE 4
/* Proxy client handshake states */
/* We use a proxy but we haven't even connected to it yet. */
#define PROXY_INFANT 1
/* We use an HTTP proxy and we've sent the CONNECT command. */
#define PROXY_HTTPS_WANT_CONNECT_OK 2
/* We use a SOCKS4 proxy and we've sent the CONNECT command. */
#define PROXY_SOCKS4_WANT_CONNECT_OK 3
/* We use a SOCKS5 proxy and we try to negotiate without
any authentication . */
#define PROXY_SOCKS5_WANT_AUTH_METHOD_NONE 4
/* We use a SOCKS5 proxy and we try to negotiate with
Username/Password authentication . */
#define PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929 5
/* We use a SOCKS5 proxy and we just sent our credentials. */
#define PROXY_SOCKS5_WANT_AUTH_RFC1929_OK 6
/* We use a SOCKS5 proxy and we just sent our CONNECT command. */
#define PROXY_SOCKS5_WANT_CONNECT_OK 7
/* We use a proxy and we CONNECTed successfully!. */
#define PROXY_CONNECTED 8
/** True iff <b>x</b> is an edge connection. */
#define CONN_IS_EDGE(x) \
((x)->type == CONN_TYPE_EXIT || (x)->type == CONN_TYPE_AP)
/** State for any listener connection. */
#define LISTENER_STATE_READY 0
#define CPUWORKER_STATE_MIN_ 1
/** State for a connection to a cpuworker process that's idle. */
#define CPUWORKER_STATE_IDLE 1
/** State for a connection to a cpuworker process that's processing a
* handshake. */
#define CPUWORKER_STATE_BUSY_ONION 2
#define CPUWORKER_STATE_MAX_ 2
#define CPUWORKER_TASK_ONION CPUWORKER_STATE_BUSY_ONION
#define OR_CONN_STATE_MIN_ 1
/** State for a connection to an OR: waiting for connect() to finish. */
#define OR_CONN_STATE_CONNECTING 1
/** State for a connection to an OR: waiting for proxy handshake to complete */
#define OR_CONN_STATE_PROXY_HANDSHAKING 2
/** State for an OR connection client: SSL is handshaking, not done
* yet. */
#define OR_CONN_STATE_TLS_HANDSHAKING 3
/** State for a connection to an OR: We're doing a second SSL handshake for
* renegotiation purposes. (V2 handshake only.) */
#define OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING 4
/** State for a connection at an OR: We're waiting for the client to
* renegotiate (to indicate a v2 handshake) or send a versions cell (to
* indicate a v3 handshake) */
#define OR_CONN_STATE_TLS_SERVER_RENEGOTIATING 5
/** State for an OR connection: We're done with our SSL handshake, we've done
* renegotiation, but we haven't yet negotiated link protocol versions and
* sent a netinfo cell. */
#define OR_CONN_STATE_OR_HANDSHAKING_V2 6
/** State for an OR connection: We're done with our SSL handshake, but we
* haven't yet negotiated link protocol versions, done a V3 handshake, and
* sent a netinfo cell. */
#define OR_CONN_STATE_OR_HANDSHAKING_V3 7
/** State for an OR connection: Ready to send/receive cells. */
#define OR_CONN_STATE_OPEN 8
#define OR_CONN_STATE_MAX_ 8
#define EXIT_CONN_STATE_MIN_ 1
/** State for an exit connection: waiting for response from DNS farm. */
#define EXIT_CONN_STATE_RESOLVING 1
/** State for an exit connection: waiting for connect() to finish. */
#define EXIT_CONN_STATE_CONNECTING 2
/** State for an exit connection: open and ready to transmit data. */
#define EXIT_CONN_STATE_OPEN 3
/** State for an exit connection: waiting to be removed. */
#define EXIT_CONN_STATE_RESOLVEFAILED 4
#define EXIT_CONN_STATE_MAX_ 4
/* The AP state values must be disjoint from the EXIT state values. */
#define AP_CONN_STATE_MIN_ 5
/** State for a SOCKS connection: waiting for SOCKS request. */
#define AP_CONN_STATE_SOCKS_WAIT 5
/** State for a SOCKS connection: got a y.onion URL; waiting to receive
* rendezvous descriptor. */
#define AP_CONN_STATE_RENDDESC_WAIT 6
/** The controller will attach this connection to a circuit; it isn't our
* job to do so. */
#define AP_CONN_STATE_CONTROLLER_WAIT 7
/** State for a SOCKS connection: waiting for a completed circuit. */
#define AP_CONN_STATE_CIRCUIT_WAIT 8
/** State for a SOCKS connection: sent BEGIN, waiting for CONNECTED. */
#define AP_CONN_STATE_CONNECT_WAIT 9
/** State for a SOCKS connection: sent RESOLVE, waiting for RESOLVED. */
#define AP_CONN_STATE_RESOLVE_WAIT 10
/** State for a SOCKS connection: ready to send and receive. */
#define AP_CONN_STATE_OPEN 11
/** State for a transparent natd connection: waiting for original
* destination. */
#define AP_CONN_STATE_NATD_WAIT 12
#define AP_CONN_STATE_MAX_ 12
/** True iff the AP_CONN_STATE_* value <b>s</b> means that the corresponding
* edge connection is not attached to any circuit. */
#define AP_CONN_STATE_IS_UNATTACHED(s) \
((s) <= AP_CONN_STATE_CIRCUIT_WAIT || (s) == AP_CONN_STATE_NATD_WAIT)
#define DIR_CONN_STATE_MIN_ 1
/** State for connection to directory server: waiting for connect(). */
#define DIR_CONN_STATE_CONNECTING 1
/** State for connection to directory server: sending HTTP request. */
#define DIR_CONN_STATE_CLIENT_SENDING 2
/** State for connection to directory server: reading HTTP response. */
#define DIR_CONN_STATE_CLIENT_READING 3
/** State for connection to directory server: happy and finished. */
#define DIR_CONN_STATE_CLIENT_FINISHED 4
/** State for connection at directory server: waiting for HTTP request. */
#define DIR_CONN_STATE_SERVER_COMMAND_WAIT 5
/** State for connection at directory server: sending HTTP response. */
#define DIR_CONN_STATE_SERVER_WRITING 6
#define DIR_CONN_STATE_MAX_ 6
/** True iff the purpose of <b>conn</b> means that it's a server-side
* directory connection. */
#define DIR_CONN_IS_SERVER(conn) ((conn)->purpose == DIR_PURPOSE_SERVER)
#define CONTROL_CONN_STATE_MIN_ 1
/** State for a control connection: Authenticated and accepting v1 commands. */
#define CONTROL_CONN_STATE_OPEN 1
/** State for a control connection: Waiting for authentication; speaking
* protocol v1. */
#define CONTROL_CONN_STATE_NEEDAUTH 2
#define CONTROL_CONN_STATE_MAX_ 2
#define DIR_PURPOSE_MIN_ 3
/** A connection to a directory server: download a rendezvous
* descriptor. */
#define DIR_PURPOSE_FETCH_RENDDESC 3
/** A connection to a directory server: set after a rendezvous
* descriptor is downloaded. */
#define DIR_PURPOSE_HAS_FETCHED_RENDDESC 4
/** A connection to a directory server: download one or more v2
* network-status objects */
#define DIR_PURPOSE_FETCH_V2_NETWORKSTATUS 5
/** A connection to a directory server: download one or more server
* descriptors. */
#define DIR_PURPOSE_FETCH_SERVERDESC 6
/** A connection to a directory server: download one or more extra-info
* documents. */
#define DIR_PURPOSE_FETCH_EXTRAINFO 7
/** A connection to a directory server: upload a server descriptor. */
#define DIR_PURPOSE_UPLOAD_DIR 8
/** A connection to a directory server: upload a rendezvous
* descriptor. */
#define DIR_PURPOSE_UPLOAD_RENDDESC 9
/** A connection to a directory server: upload a v3 networkstatus vote. */
#define DIR_PURPOSE_UPLOAD_VOTE 10
/** A connection to a directory server: upload a v3 consensus signature */
#define DIR_PURPOSE_UPLOAD_SIGNATURES 11
/** A connection to a directory server: download one or more v3 networkstatus
* votes. */
#define DIR_PURPOSE_FETCH_STATUS_VOTE 12
/** A connection to a directory server: download a v3 detached signatures
* object for a consensus. */
#define DIR_PURPOSE_FETCH_DETACHED_SIGNATURES 13
/** A connection to a directory server: download a v3 networkstatus
* consensus. */
#define DIR_PURPOSE_FETCH_CONSENSUS 14
/** A connection to a directory server: download one or more directory
* authority certificates. */
#define DIR_PURPOSE_FETCH_CERTIFICATE 15
/** Purpose for connection at a directory server. */
#define DIR_PURPOSE_SERVER 16
/** A connection to a hidden service directory server: upload a v2 rendezvous
* descriptor. */
#define DIR_PURPOSE_UPLOAD_RENDDESC_V2 17
/** A connection to a hidden service directory server: download a v2 rendezvous
* descriptor. */
#define DIR_PURPOSE_FETCH_RENDDESC_V2 18
/** A connection to a directory server: download a microdescriptor. */
#define DIR_PURPOSE_FETCH_MICRODESC 19
#define DIR_PURPOSE_MAX_ 19
/** True iff <b>p</b> is a purpose corresponding to uploading data to a
* directory server. */
#define DIR_PURPOSE_IS_UPLOAD(p) \
((p)==DIR_PURPOSE_UPLOAD_DIR || \
(p)==DIR_PURPOSE_UPLOAD_RENDDESC || \
(p)==DIR_PURPOSE_UPLOAD_VOTE || \
(p)==DIR_PURPOSE_UPLOAD_SIGNATURES)
#define EXIT_PURPOSE_MIN_ 1
/** This exit stream wants to do an ordinary connect. */
#define EXIT_PURPOSE_CONNECT 1
/** This exit stream wants to do a resolve (either normal or reverse). */
#define EXIT_PURPOSE_RESOLVE 2
#define EXIT_PURPOSE_MAX_ 2
/* !!!! If any connection purpose is ever over 31, we must grow the type
* field in connection_t. */
/** Circuit state: I'm the origin, still haven't done all my handshakes. */
#define CIRCUIT_STATE_BUILDING 0
/** Circuit state: Waiting to process the onionskin. */
#define CIRCUIT_STATE_ONIONSKIN_PENDING 1
/** Circuit state: I'd like to deliver a create, but my n_chan is still
* connecting. */
#define CIRCUIT_STATE_CHAN_WAIT 2
/** Circuit state: onionskin(s) processed, ready to send/receive cells. */
#define CIRCUIT_STATE_OPEN 3
#define CIRCUIT_PURPOSE_MIN_ 1
/* these circuits were initiated elsewhere */
#define CIRCUIT_PURPOSE_OR_MIN_ 1
/** OR-side circuit purpose: normal circuit, at OR. */
#define CIRCUIT_PURPOSE_OR 1
/** OR-side circuit purpose: At OR, from Bob, waiting for intro from Alices. */
#define CIRCUIT_PURPOSE_INTRO_POINT 2
/** OR-side circuit purpose: At OR, from Alice, waiting for Bob. */
#define CIRCUIT_PURPOSE_REND_POINT_WAITING 3
/** OR-side circuit purpose: At OR, both circuits have this purpose. */
#define CIRCUIT_PURPOSE_REND_ESTABLISHED 4
#define CIRCUIT_PURPOSE_OR_MAX_ 4
/* these circuits originate at this node */
/* here's how circ client-side purposes work:
* normal circuits are C_GENERAL.
* circuits that are c_introducing are either on their way to
* becoming open, or they are open and waiting for a
* suitable rendcirc before they send the intro.
* circuits that are c_introduce_ack_wait have sent the intro,
* but haven't gotten a response yet.
* circuits that are c_establish_rend are either on their way
* to becoming open, or they are open and have sent the
* establish_rendezvous cell but haven't received an ack.
* circuits that are c_rend_ready are open and have received a
* rend ack, but haven't heard from bob yet. if they have a
* buildstate->pending_final_cpath then they're expecting a
* cell from bob, else they're not.
* circuits that are c_rend_ready_intro_acked are open, and
* some intro circ has sent its intro and received an ack.
* circuits that are c_rend_joined are open, have heard from
* bob, and are talking to him.
*/
/** Client-side circuit purpose: Normal circuit, with cpath. */
#define CIRCUIT_PURPOSE_C_GENERAL 5
/** Client-side circuit purpose: at Alice, connecting to intro point. */
#define CIRCUIT_PURPOSE_C_INTRODUCING 6
/** Client-side circuit purpose: at Alice, sent INTRODUCE1 to intro point,
* waiting for ACK/NAK. */
#define CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT 7
/** Client-side circuit purpose: at Alice, introduced and acked, closing. */
#define CIRCUIT_PURPOSE_C_INTRODUCE_ACKED 8
/** Client-side circuit purpose: at Alice, waiting for ack. */
#define CIRCUIT_PURPOSE_C_ESTABLISH_REND 9
/** Client-side circuit purpose: at Alice, waiting for Bob. */
#define CIRCUIT_PURPOSE_C_REND_READY 10
/** Client-side circuit purpose: at Alice, waiting for Bob, INTRODUCE
* has been acknowledged. */
#define CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED 11
/** Client-side circuit purpose: at Alice, rendezvous established. */
#define CIRCUIT_PURPOSE_C_REND_JOINED 12
/** This circuit is used for build time measurement only */
#define CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT 13
#define CIRCUIT_PURPOSE_C_MAX_ 13
/** Hidden-service-side circuit purpose: at Bob, waiting for introductions. */
#define CIRCUIT_PURPOSE_S_ESTABLISH_INTRO 14
/** Hidden-service-side circuit purpose: at Bob, successfully established
* intro. */
#define CIRCUIT_PURPOSE_S_INTRO 15
/** Hidden-service-side circuit purpose: at Bob, connecting to rend point. */
#define CIRCUIT_PURPOSE_S_CONNECT_REND 16
/** Hidden-service-side circuit purpose: at Bob, rendezvous established. */
#define CIRCUIT_PURPOSE_S_REND_JOINED 17
/** A testing circuit; not meant to be used for actual traffic. */
#define CIRCUIT_PURPOSE_TESTING 18
/** A controller made this circuit and Tor should not use it. */
#define CIRCUIT_PURPOSE_CONTROLLER 19
#define CIRCUIT_PURPOSE_MAX_ 19
/** A catch-all for unrecognized purposes. Currently we don't expect
* to make or see any circuits with this purpose. */
#define CIRCUIT_PURPOSE_UNKNOWN 255
/** True iff the circuit purpose <b>p</b> is for a circuit that
* originated at this node. */
#define CIRCUIT_PURPOSE_IS_ORIGIN(p) ((p)>CIRCUIT_PURPOSE_OR_MAX_)
/** True iff the circuit purpose <b>p</b> is for a circuit that originated
* here to serve as a client. (Hidden services don't count here.) */
#define CIRCUIT_PURPOSE_IS_CLIENT(p) \
((p)> CIRCUIT_PURPOSE_OR_MAX_ && \
(p)<=CIRCUIT_PURPOSE_C_MAX_)
/** True iff the circuit_t <b>c</b> is actually an origin_circuit_t. */
#define CIRCUIT_IS_ORIGIN(c) (CIRCUIT_PURPOSE_IS_ORIGIN((c)->purpose))
/** True iff the circuit purpose <b>p</b> is for an established rendezvous
* circuit. */
#define CIRCUIT_PURPOSE_IS_ESTABLISHED_REND(p) \
((p) == CIRCUIT_PURPOSE_C_REND_JOINED || \
(p) == CIRCUIT_PURPOSE_S_REND_JOINED)
/** How many circuits do we want simultaneously in-progress to handle
* a given stream? */
#define MIN_CIRCUITS_HANDLING_STREAM 2
/* These RELAY_COMMAND constants define values for relay cell commands, and
* must match those defined in tor-spec.txt. */
#define RELAY_COMMAND_BEGIN 1
#define RELAY_COMMAND_DATA 2
#define RELAY_COMMAND_END 3
#define RELAY_COMMAND_CONNECTED 4
#define RELAY_COMMAND_SENDME 5
#define RELAY_COMMAND_EXTEND 6
#define RELAY_COMMAND_EXTENDED 7
#define RELAY_COMMAND_TRUNCATE 8
#define RELAY_COMMAND_TRUNCATED 9
#define RELAY_COMMAND_DROP 10
#define RELAY_COMMAND_RESOLVE 11
#define RELAY_COMMAND_RESOLVED 12
#define RELAY_COMMAND_BEGIN_DIR 13
#define RELAY_COMMAND_ESTABLISH_INTRO 32
#define RELAY_COMMAND_ESTABLISH_RENDEZVOUS 33
#define RELAY_COMMAND_INTRODUCE1 34
#define RELAY_COMMAND_INTRODUCE2 35
#define RELAY_COMMAND_RENDEZVOUS1 36
#define RELAY_COMMAND_RENDEZVOUS2 37
#define RELAY_COMMAND_INTRO_ESTABLISHED 38
#define RELAY_COMMAND_RENDEZVOUS_ESTABLISHED 39
#define RELAY_COMMAND_INTRODUCE_ACK 40
/* Reasons why an OR connection is closed. */
#define END_OR_CONN_REASON_DONE 1
#define END_OR_CONN_REASON_REFUSED 2 /* connection refused */
#define END_OR_CONN_REASON_OR_IDENTITY 3
#define END_OR_CONN_REASON_CONNRESET 4 /* connection reset by peer */
#define END_OR_CONN_REASON_TIMEOUT 5
#define END_OR_CONN_REASON_NO_ROUTE 6 /* no route to host/net */
#define END_OR_CONN_REASON_IO_ERROR 7 /* read/write error */
#define END_OR_CONN_REASON_RESOURCE_LIMIT 8 /* sockets, buffers, etc */
#define END_OR_CONN_REASON_MISC 9
/* Reasons why we (or a remote OR) might close a stream. See tor-spec.txt for
* documentation of these. The values must match. */
#define END_STREAM_REASON_MISC 1
#define END_STREAM_REASON_RESOLVEFAILED 2
#define END_STREAM_REASON_CONNECTREFUSED 3
#define END_STREAM_REASON_EXITPOLICY 4
#define END_STREAM_REASON_DESTROY 5
#define END_STREAM_REASON_DONE 6
#define END_STREAM_REASON_TIMEOUT 7
#define END_STREAM_REASON_NOROUTE 8
#define END_STREAM_REASON_HIBERNATING 9
#define END_STREAM_REASON_INTERNAL 10
#define END_STREAM_REASON_RESOURCELIMIT 11
#define END_STREAM_REASON_CONNRESET 12
#define END_STREAM_REASON_TORPROTOCOL 13
#define END_STREAM_REASON_NOTDIRECTORY 14
#define END_STREAM_REASON_ENTRYPOLICY 15
/* These high-numbered end reasons are not part of the official spec,
* and are not intended to be put in relay end cells. They are here
* to be more informative when sending back socks replies to the
* application. */
/* XXXX 256 is no longer used; feel free to reuse it. */
/** We were unable to attach the connection to any circuit at all. */
/* XXXX the ways we use this one don't make a lot of sense. */
#define END_STREAM_REASON_CANT_ATTACH 257
/** We can't connect to any directories at all, so we killed our streams
* before they can time out. */
#define END_STREAM_REASON_NET_UNREACHABLE 258
/** This is a SOCKS connection, and the client used (or misused) the SOCKS
* protocol in a way we couldn't handle. */
#define END_STREAM_REASON_SOCKSPROTOCOL 259
/** This is a transparent proxy connection, but we can't extract the original
* target address:port. */
#define END_STREAM_REASON_CANT_FETCH_ORIG_DEST 260
/** This is a connection on the NATD port, and the destination IP:Port was
* either ill-formed or out-of-range. */
#define END_STREAM_REASON_INVALID_NATD_DEST 261
/** The target address is in a private network (like 127.0.0.1 or 10.0.0.1);
* you don't want to do that over a randomly chosen exit */
#define END_STREAM_REASON_PRIVATE_ADDR 262
/** Bitwise-and this value with endreason to mask out all flags. */
#define END_STREAM_REASON_MASK 511
/** Bitwise-or this with the argument to control_event_stream_status
* to indicate that the reason came from an END cell. */
#define END_STREAM_REASON_FLAG_REMOTE 512
/** Bitwise-or this with the argument to control_event_stream_status
* to indicate that we already sent a CLOSED stream event. */
#define END_STREAM_REASON_FLAG_ALREADY_SENT_CLOSED 1024
/** Bitwise-or this with endreason to indicate that we already sent
* a socks reply, and no further reply needs to be sent from
* connection_mark_unattached_ap(). */
#define END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED 2048
/** Reason for remapping an AP connection's address: we have a cached
* answer. */
#define REMAP_STREAM_SOURCE_CACHE 1
/** Reason for remapping an AP connection's address: the exit node told us an
* answer. */
#define REMAP_STREAM_SOURCE_EXIT 2
/* 'type' values to use in RESOLVED cells. Specified in tor-spec.txt. */
#define RESOLVED_TYPE_HOSTNAME 0
#define RESOLVED_TYPE_IPV4 4
#define RESOLVED_TYPE_IPV6 6
#define RESOLVED_TYPE_ERROR_TRANSIENT 0xF0
#define RESOLVED_TYPE_ERROR 0xF1
/* Negative reasons are internal: we never send them in a DESTROY or TRUNCATE
* call; they only go to the controller for tracking */
/** Our post-timeout circuit time measurement period expired.
* We must give up now */
#define END_CIRC_REASON_MEASUREMENT_EXPIRED -3
/** We couldn't build a path for this circuit. */
#define END_CIRC_REASON_NOPATH -2
/** Catch-all "other" reason for closing origin circuits. */
#define END_CIRC_AT_ORIGIN -1
/* Reasons why we (or a remote OR) might close a circuit. See tor-spec.txt for
* documentation of these. */
#define END_CIRC_REASON_MIN_ 0
#define END_CIRC_REASON_NONE 0
#define END_CIRC_REASON_TORPROTOCOL 1
#define END_CIRC_REASON_INTERNAL 2
#define END_CIRC_REASON_REQUESTED 3
#define END_CIRC_REASON_HIBERNATING 4
#define END_CIRC_REASON_RESOURCELIMIT 5
#define END_CIRC_REASON_CONNECTFAILED 6
#define END_CIRC_REASON_OR_IDENTITY 7
#define END_CIRC_REASON_CHANNEL_CLOSED 8
#define END_CIRC_REASON_FINISHED 9
#define END_CIRC_REASON_TIMEOUT 10
#define END_CIRC_REASON_DESTROYED 11
#define END_CIRC_REASON_NOSUCHSERVICE 12
#define END_CIRC_REASON_MAX_ 12
/** Bitwise-OR this with the argument to circuit_mark_for_close() or
* control_event_circuit_status() to indicate that the reason was
* passed through from a destroy or truncate cell. */
#define END_CIRC_REASON_FLAG_REMOTE 512
/** Length of 'y' portion of 'y.onion' URL. */
#define REND_SERVICE_ID_LEN_BASE32 16
/** Length of 'y.onion' including '.onion' URL. */
#define REND_SERVICE_ADDRESS_LEN (16+1+5)
/** Length of a binary-encoded rendezvous service ID. */
#define REND_SERVICE_ID_LEN 10
/** Time period for which a v2 descriptor will be valid. */
#define REND_TIME_PERIOD_V2_DESC_VALIDITY (24*60*60)
/** Time period within which two sets of v2 descriptors will be uploaded in
* parallel. */
#define REND_TIME_PERIOD_OVERLAPPING_V2_DESCS (60*60)
/** Number of non-consecutive replicas (i.e. distributed somewhere
* in the ring) for a descriptor. */
#define REND_NUMBER_OF_NON_CONSECUTIVE_REPLICAS 2
/** Number of consecutive replicas for a descriptor. */
#define REND_NUMBER_OF_CONSECUTIVE_REPLICAS 3
/** Length of v2 descriptor ID (32 base32 chars = 160 bits). */
#define REND_DESC_ID_V2_LEN_BASE32 32
/** Length of the base32-encoded secret ID part of versioned hidden service
* descriptors. */
#define REND_SECRET_ID_PART_LEN_BASE32 32
/** Length of the base32-encoded hash of an introduction point's
* identity key. */
#define REND_INTRO_POINT_ID_LEN_BASE32 32
/** Length of the descriptor cookie that is used for client authorization
* to hidden services. */
#define REND_DESC_COOKIE_LEN 16
/** Length of the base64-encoded descriptor cookie that is used for
* exchanging client authorization between hidden service and client. */
#define REND_DESC_COOKIE_LEN_BASE64 22
/** Length of client identifier in encrypted introduction points for hidden
* service authorization type 'basic'. */
#define REND_BASIC_AUTH_CLIENT_ID_LEN 4
/** Multiple of the number of clients to which the real number of clients
* is padded with fake clients for hidden service authorization type
* 'basic'. */
#define REND_BASIC_AUTH_CLIENT_MULTIPLE 16
/** Length of client entry consisting of client identifier and encrypted
* session key for hidden service authorization type 'basic'. */
#define REND_BASIC_AUTH_CLIENT_ENTRY_LEN (REND_BASIC_AUTH_CLIENT_ID_LEN \
+ CIPHER_KEY_LEN)
/** Maximum size of v2 hidden service descriptors. */
#define REND_DESC_MAX_SIZE (20 * 1024)
/** Legal characters for use in authorized client names for a hidden
* service. */
#define REND_LEGAL_CLIENTNAME_CHARACTERS \
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+-_"
/** Maximum length of authorized client names for a hidden service. */
#define REND_CLIENTNAME_MAX_LEN 16
/** Length of the rendezvous cookie that is used to connect circuits at the
* rendezvous point. */
#define REND_COOKIE_LEN DIGEST_LEN
/** Client authorization type that a hidden service performs. */
typedef enum rend_auth_type_t {
REND_NO_AUTH = 0,
REND_BASIC_AUTH = 1,
REND_STEALTH_AUTH = 2,
} rend_auth_type_t;
/** Client-side configuration of authorization for a hidden service. */
typedef struct rend_service_authorization_t {
char descriptor_cookie[REND_DESC_COOKIE_LEN];
char onion_address[REND_SERVICE_ADDRESS_LEN+1];
rend_auth_type_t auth_type;
} rend_service_authorization_t;
/** Client- and server-side data that is used for hidden service connection
* establishment. Not all fields contain data depending on where this struct
* is used. */
typedef struct rend_data_t {
/** Onion address (without the .onion part) that a client requests. */
char onion_address[REND_SERVICE_ID_LEN_BASE32+1];
/** (Optional) descriptor cookie that is used by a client. */
char descriptor_cookie[REND_DESC_COOKIE_LEN];
/** Authorization type for accessing a service used by a client. */
rend_auth_type_t auth_type;
/** Hash of the hidden service's PK used by a service. */
char rend_pk_digest[DIGEST_LEN];
/** Rendezvous cookie used by both, client and service. */
char rend_cookie[REND_COOKIE_LEN];
} rend_data_t;
/** Time interval for tracking replays of DH public keys received in
* INTRODUCE2 cells. Used only to avoid launching multiple
* simultaneous attempts to connect to the same rendezvous point. */
#define REND_REPLAY_TIME_INTERVAL (5 * 60)
/** Used to indicate which way a cell is going on a circuit. */
typedef enum {
CELL_DIRECTION_IN=1, /**< The cell is moving towards the origin. */
CELL_DIRECTION_OUT=2, /**< The cell is moving away from the origin. */
} cell_direction_t;
/** Initial value for both sides of a circuit transmission window when the
* circuit is initialized. Measured in cells. */
#define CIRCWINDOW_START 1000
#define CIRCWINDOW_START_MIN 100
#define CIRCWINDOW_START_MAX 1000
/** Amount to increment a circuit window when we get a circuit SENDME. */
#define CIRCWINDOW_INCREMENT 100
/** Initial value on both sides of a stream transmission window when the
* stream is initialized. Measured in cells. */
#define STREAMWINDOW_START 500
/** Amount to increment a stream window when we get a stream SENDME. */
#define STREAMWINDOW_INCREMENT 50
/* Cell commands. These values are defined in tor-spec.txt. */
#define CELL_PADDING 0
#define CELL_CREATE 1
#define CELL_CREATED 2
#define CELL_RELAY 3
#define CELL_DESTROY 4
#define CELL_CREATE_FAST 5
#define CELL_CREATED_FAST 6
#define CELL_VERSIONS 7
#define CELL_NETINFO 8
#define CELL_RELAY_EARLY 9
#define CELL_VPADDING 128
#define CELL_CERTS 129
#define CELL_AUTH_CHALLENGE 130
#define CELL_AUTHENTICATE 131
#define CELL_AUTHORIZE 132
/** How long to test reachability before complaining to the user. */
#define TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT (20*60)
/** Legal characters in a nickname. */
#define LEGAL_NICKNAME_CHARACTERS \
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
/** Name to use in client TLS certificates if no nickname is given. Once
* Tor 0.1.2.x is obsolete, we can remove this. */
#define DEFAULT_CLIENT_NICKNAME "client"
/** Name chosen by routers that don't configure nicknames */
#define UNNAMED_ROUTER_NICKNAME "Unnamed"
/** Number of bytes in a SOCKS4 header. */
#define SOCKS4_NETWORK_LEN 8
/*
* Relay payload:
* Relay command [1 byte]
* Recognized [2 bytes]
* Stream ID [2 bytes]
* Partial SHA-1 [4 bytes]
* Length [2 bytes]
* Relay payload [498 bytes]
*/
/** Number of bytes in a cell, minus cell header. */
#define CELL_PAYLOAD_SIZE 509
/** Number of bytes in a cell transmitted over the network. */
#define CELL_NETWORK_SIZE 512
/** Length of a header on a variable-length cell. */
#define VAR_CELL_HEADER_SIZE 5
/** Number of bytes in a relay cell's header (not including general cell
* header). */
#define RELAY_HEADER_SIZE (1+2+2+4+2)
/** Largest number of bytes that can fit in a relay cell payload. */
#define RELAY_PAYLOAD_SIZE (CELL_PAYLOAD_SIZE-RELAY_HEADER_SIZE)
/** Identifies a circuit on an or_connection */
typedef uint16_t circid_t;
/** Identifies a stream on a circuit */
typedef uint16_t streamid_t;
/* channel_t typedef; struct channel_s is in channel.h */
typedef struct channel_s channel_t;
/* channel_listener_t typedef; struct channel_listener_s is in channel.h */
typedef struct channel_listener_s channel_listener_t;
/* channel states for channel_t */
typedef enum {
/*
* Closed state - channel is inactive
*
* Permitted transitions from:
* - CHANNEL_STATE_CLOSING
* Permitted transitions to:
* - CHANNEL_STATE_OPENING
*/
CHANNEL_STATE_CLOSED = 0,
/*
* Opening state - channel is trying to connect
*
* Permitted transitions from:
* - CHANNEL_STATE_CLOSED
* Permitted transitions to:
* - CHANNEL_STATE_CLOSING
* - CHANNEL_STATE_ERROR
* - CHANNEL_STATE_OPEN
*/
CHANNEL_STATE_OPENING,
/*
* Open state - channel is active and ready for use
*
* Permitted transitions from:
* - CHANNEL_STATE_MAINT
* - CHANNEL_STATE_OPENING
* Permitted transitions to:
* - CHANNEL_STATE_CLOSING
* - CHANNEL_STATE_ERROR
* - CHANNEL_STATE_MAINT
*/
CHANNEL_STATE_OPEN,
/*
* Maintenance state - channel is temporarily offline for subclass specific
* maintenance activities such as TLS renegotiation.
*
* Permitted transitions from:
* - CHANNEL_STATE_OPEN
* Permitted transitions to:
* - CHANNEL_STATE_CLOSING
* - CHANNEL_STATE_ERROR
* - CHANNEL_STATE_OPEN
*/
CHANNEL_STATE_MAINT,
/*
* Closing state - channel is shutting down
*
* Permitted transitions from:
* - CHANNEL_STATE_MAINT
* - CHANNEL_STATE_OPEN
* Permitted transitions to:
* - CHANNEL_STATE_CLOSED,
* - CHANNEL_STATE_ERROR
*/
CHANNEL_STATE_CLOSING,
/*
* Error state - channel has experienced a permanent error
*
* Permitted transitions from:
* - CHANNEL_STATE_CLOSING
* - CHANNEL_STATE_MAINT
* - CHANNEL_STATE_OPENING
* - CHANNEL_STATE_OPEN
* Permitted transitions to:
* - None
*/
CHANNEL_STATE_ERROR,
/*
* Placeholder for maximum state value
*/
CHANNEL_STATE_LAST
} channel_state_t;
/* channel listener states for channel_listener_t */
typedef enum {
/*
* Closed state - channel listener is inactive
*
* Permitted transitions from:
* - CHANNEL_LISTENER_STATE_CLOSING
* Permitted transitions to:
* - CHANNEL_LISTENER_STATE_LISTENING
*/
CHANNEL_LISTENER_STATE_CLOSED = 0,
/*
* Listening state - channel listener is listening for incoming
* connections
*
* Permitted transitions from:
* - CHANNEL_LISTENER_STATE_CLOSED
* Permitted transitions to:
* - CHANNEL_LISTENER_STATE_CLOSING
* - CHANNEL_LISTENER_STATE_ERROR
*/
CHANNEL_LISTENER_STATE_LISTENING,
/*
* Closing state - channel listener is shutting down
*
* Permitted transitions from:
* - CHANNEL_LISTENER_STATE_LISTENING
* Permitted transitions to:
* - CHANNEL_LISTENER_STATE_CLOSED,
* - CHANNEL_LISTENER_STATE_ERROR
*/
CHANNEL_LISTENER_STATE_CLOSING,
/*
* Error state - channel listener has experienced a permanent error
*
* Permitted transitions from:
* - CHANNEL_STATE_CLOSING
* - CHANNEL_STATE_LISTENING
* Permitted transitions to:
* - None
*/
CHANNEL_LISTENER_STATE_ERROR,
/*
* Placeholder for maximum state value
*/
CHANNEL_LISTENER_STATE_LAST
} channel_listener_state_t;
/* TLS channel stuff */
typedef struct channel_tls_s channel_tls_t;
/* circuitmux_t typedef; struct circuitmux_s is in circuitmux.h */
typedef struct circuitmux_s circuitmux_t;
/** Parsed onion routing cell. All communication between nodes
* is via cells. */
typedef struct cell_t {
circid_t circ_id; /**< Circuit which received the cell. */
uint8_t command; /**< Type of the cell: one of CELL_PADDING, CELL_CREATE,
* CELL_DESTROY, etc */
uint8_t payload[CELL_PAYLOAD_SIZE]; /**< Cell body. */
} cell_t;
/** Parsed variable-length onion routing cell. */
typedef struct var_cell_t {
/** Type of the cell: CELL_VERSIONS, etc. */
uint8_t command;
/** Circuit thich received the cell */
circid_t circ_id;
/** Number of bytes actually stored in <b>payload</b> */
uint16_t payload_len;
/** Payload of this cell */
uint8_t payload[FLEXIBLE_ARRAY_MEMBER];
} var_cell_t;
/** A cell as packed for writing to the network. */
typedef struct packed_cell_t {
struct packed_cell_t *next; /**< Next cell queued on this circuit. */
char body[CELL_NETWORK_SIZE]; /**< Cell as packed for network. */
} packed_cell_t;
/** Number of cells added to a circuit queue including their insertion
* time on 10 millisecond detail; used for buffer statistics. */
typedef struct insertion_time_elem_t {
struct insertion_time_elem_t *next; /**< Next element in queue. */
uint32_t insertion_time; /**< When were cells inserted (in 10 ms steps
* starting at 0:00 of the current day)? */
unsigned counter; /**< How many cells were inserted? */
} insertion_time_elem_t;
/** Queue of insertion times. */
typedef struct insertion_time_queue_t {
struct insertion_time_elem_t *first; /**< First element in queue. */
struct insertion_time_elem_t *last; /**< Last element in queue. */
} insertion_time_queue_t;
/** A queue of cells on a circuit, waiting to be added to the
* or_connection_t's outbuf. */
typedef struct cell_queue_t {
packed_cell_t *head; /**< The first cell, or NULL if the queue is empty. */
packed_cell_t *tail; /**< The last cell, or NULL if the queue is empty. */
int n; /**< The number of cells in the queue. */
insertion_time_queue_t *insertion_times; /**< Insertion times of cells. */
} cell_queue_t;
/** Beginning of a RELAY cell payload. */
typedef struct {
uint8_t command; /**< The end-to-end relay command. */
uint16_t recognized; /**< Used to tell whether cell is for us. */
streamid_t stream_id; /**< Which stream is this cell associated with? */
char integrity[4]; /**< Used to tell whether cell is corrupted. */
uint16_t length; /**< How long is the payload body? */
} relay_header_t;
typedef struct buf_t buf_t;
typedef struct socks_request_t socks_request_t;
#ifdef USE_BUFFEREVENTS
#define generic_buffer_t struct evbuffer
#else
#define generic_buffer_t buf_t
#endif
/* Values for connection_t.magic: used to make sure that downcasts (casts from
* connection_t to foo_connection_t) are safe. */
#define BASE_CONNECTION_MAGIC 0x7C3C304Eu
#define OR_CONNECTION_MAGIC 0x7D31FF03u
#define EDGE_CONNECTION_MAGIC 0xF0374013u
#define ENTRY_CONNECTION_MAGIC 0xbb4a5703
#define DIR_CONNECTION_MAGIC 0x9988ffeeu
#define CONTROL_CONNECTION_MAGIC 0x8abc765du
#define LISTENER_CONNECTION_MAGIC 0x1a1ac741u
/** Description of a connection to another host or process, and associated
* data.
*
* A connection is named based on what it's connected to -- an "OR
* connection" has a Tor node on the other end, an "exit
* connection" has a website or other server on the other end, and an
* "AP connection" has an application proxy (and thus a user) on the
* other end.
*
* Every connection has a type and a state. Connections never change
* their type, but can go through many state changes in their lifetime.
*
* Every connection has two associated input and output buffers.
* Listeners don't use them. For non-listener connections, incoming
* data is appended to conn->inbuf, and outgoing data is taken from
* conn->outbuf. Connections differ primarily in the functions called
* to fill and drain these buffers.
*/
typedef struct connection_t {
uint32_t magic; /**< For memory debugging: must equal one of
* *_CONNECTION_MAGIC. */
uint8_t state; /**< Current state of this connection. */
unsigned int type:4; /**< What kind of connection is this? */
unsigned int purpose:5; /**< Only used for DIR and EXIT types currently. */
/* The next fields are all one-bit booleans. Some are only applicable to
* connection subtypes, but we hold them here anyway, to save space.
*/
unsigned int read_blocked_on_bw:1; /**< Boolean: should we start reading
* again once the bandwidth throttler allows it? */
unsigned int write_blocked_on_bw:1; /**< Boolean: should we start writing
* again once the bandwidth throttler allows
* writes? */
unsigned int hold_open_until_flushed:1; /**< Despite this connection's being
* marked for close, do we flush it
* before closing it? */
unsigned int inbuf_reached_eof:1; /**< Boolean: did read() return 0 on this
* conn? */
/** Set to 1 when we're inside connection_flushed_some to keep us from
* calling connection_handle_write() recursively. */
unsigned int in_flushed_some:1;
/* For linked connections:
*/
unsigned int linked:1; /**< True if there is, or has been, a linked_conn. */
/** True iff we'd like to be notified about read events from the
* linked conn. */
unsigned int reading_from_linked_conn:1;
/** True iff we're willing to write to the linked conn. */
unsigned int writing_to_linked_conn:1;
/** True iff we're currently able to read on the linked conn, and our
* read_event should be made active with libevent. */
unsigned int active_on_link:1;
/** True iff we've called connection_close_immediate() on this linked
* connection. */
unsigned int linked_conn_is_closed:1;
/** CONNECT/SOCKS proxy client handshake state (for outgoing connections). */
unsigned int proxy_state:4;
/** Our socket; set to TOR_INVALID_SOCKET if this connection is closed,
* or has no socket. */
tor_socket_t s;
int conn_array_index; /**< Index into the global connection array. */
struct event *read_event; /**< Libevent event structure. */
struct event *write_event; /**< Libevent event structure. */
buf_t *inbuf; /**< Buffer holding data read over this connection. */
buf_t *outbuf; /**< Buffer holding data to write over this connection. */
size_t outbuf_flushlen; /**< How much data should we try to flush from the
* outbuf? */
time_t timestamp_lastread; /**< When was the last time libevent said we could
* read? */
time_t timestamp_lastwritten; /**< When was the last time libevent said we
* could write? */
#ifdef USE_BUFFEREVENTS
struct bufferevent *bufev; /**< A Libevent buffered IO structure. */
#endif
time_t timestamp_created; /**< When was this connection_t created? */
/* XXXX_IP6 make this IPv6-capable */
int socket_family; /**< Address family of this connection's socket. Usually
* AF_INET, but it can also be AF_UNIX, or in the future
* AF_INET6 */
tor_addr_t addr; /**< IP of the other side of the connection; used to
* identify routers, along with port. */
uint16_t port; /**< If non-zero, port on the other end
* of the connection. */
uint16_t marked_for_close; /**< Should we close this conn on the next
* iteration of the main loop? (If true, holds
* the line number where this connection was
* marked.) */
const char *marked_for_close_file; /**< For debugging: in which file were
* we marked for close? */
char *address; /**< FQDN (or IP) of the guy on the other end.
* strdup into this, because free_connection() frees it. */
/** Another connection that's connected to this one in lieu of a socket. */
struct connection_t *linked_conn;
/** Unique identifier for this connection on this Tor instance. */
uint64_t global_identifier;
} connection_t;
/** Subtype of connection_t; used for a listener socket. */
typedef struct listener_connection_t {
connection_t base_;
/** If the connection is a CONN_TYPE_AP_DNS_LISTENER, this field points
* to the evdns_server_port it uses to listen to and answer connections. */
struct evdns_server_port *dns_server_port;
/** @name Isolation parameters
*
* For an AP listener, these fields describe how to isolate streams that
* arrive on the listener.
*
* @{
*/
/** The session group for this listener. */
int session_group;
/** One or more ISO_ flags to describe how to isolate streams. */
uint8_t isolation_flags;
/**@}*/
/** For a SOCKS listener, these fields describe whether we should
* allow IPv4 and IPv6 addresses from our exit nodes, respectively.
*
* @{
*/
unsigned int socks_ipv4_traffic : 1;
unsigned int socks_ipv6_traffic : 1;
/** @} */
/** For a socks listener: should we tell the exit that we prefer IPv6
* addresses? */
unsigned int socks_prefer_ipv6 : 1;
} listener_connection_t;
/** Minimum length of the random part of an AUTH_CHALLENGE cell. */
#define OR_AUTH_CHALLENGE_LEN 32
/**
* @name Certificate types for CERTS cells.
*
* These values are defined by the protocol, and affect how an X509
* certificate in a CERTS cell is interpreted and used.
*
* @{ */
/** A certificate that authenticates a TLS link key. The subject key
* must match the key used in the TLS handshake; it must be signed by
* the identity key. */
#define OR_CERT_TYPE_TLS_LINK 1
/** A self-signed identity certificate. The subject key must be a
* 1024-bit RSA key. */
#define OR_CERT_TYPE_ID_1024 2
/** A certificate that authenticates a key used in an AUTHENTICATE cell
* in the v3 handshake. The subject key must be a 1024-bit RSA key; it
* must be signed by the identity key */
#define OR_CERT_TYPE_AUTH_1024 3
/**@}*/
/** The one currently supported type of AUTHENTICATE cell. It contains
* a bunch of structures signed with an RSA1024 key. The signed
* structures include a HMAC using negotiated TLS secrets, and a digest
* of all cells sent or received before the AUTHENTICATE cell (including
* the random server-generated AUTH_CHALLENGE cell).
*/
#define AUTHTYPE_RSA_SHA256_TLSSECRET 1
/** The length of the part of the AUTHENTICATE cell body that the client and
* server can generate independently (when using RSA_SHA256_TLSSECRET). It
* contains everything except the client's timestamp, the client's randomly
* generated nonce, and the signature. */
#define V3_AUTH_FIXED_PART_LEN (8+(32*6))
/** The length of the part of the AUTHENTICATE cell body that the client
* signs. */
#define V3_AUTH_BODY_LEN (V3_AUTH_FIXED_PART_LEN + 8 + 16)
/** Stores flags and information related to the portion of a v2/v3 Tor OR
* connection handshake that happens after the TLS handshake is finished.
*/
typedef struct or_handshake_state_t {
/** When was the VERSIONS cell sent on this connection? Used to get
* an estimate of the skew in the returning NETINFO reply. */
time_t sent_versions_at;
/** True iff we originated this connection */
unsigned int started_here : 1;
/** True iff we have received and processed a VERSIONS cell. */
unsigned int received_versions : 1;
/** True iff we have received and processed an AUTH_CHALLENGE cell */
unsigned int received_auth_challenge : 1;
/** True iff we have received and processed a CERTS cell. */
unsigned int received_certs_cell : 1;
/** True iff we have received and processed an AUTHENTICATE cell */
unsigned int received_authenticate : 1;
/* True iff we've received valid authentication to some identity. */
unsigned int authenticated : 1;
/** True iff we should feed outgoing cells into digest_sent and
* digest_received respectively.
*
* From the server's side of the v3 handshake, we want to capture everything
* from the VERSIONS cell through and including the AUTH_CHALLENGE cell.
* From the client's, we want to capture everything from the VERSIONS cell
* through but *not* including the AUTHENTICATE cell.
*
* @{ */
unsigned int digest_sent_data : 1;
unsigned int digest_received_data : 1;
/**@}*/
/** Identity digest that we have received and authenticated for our peer
* on this connection. */
uint8_t authenticated_peer_id[DIGEST_LEN];
/** Digests of the cells that we have sent or received as part of a V3
* handshake. Used for making and checking AUTHENTICATE cells.
*
* @{
*/
crypto_digest_t *digest_sent;
crypto_digest_t *digest_received;
/** @} */
/** Certificates that a connection initiator sent us in a CERTS cell; we're
* holding on to them until we get an AUTHENTICATE cell.
*
* @{
*/
/** The cert for the key that's supposed to sign the AUTHENTICATE cell */
tor_cert_t *auth_cert;
/** A self-signed identity certificate */
tor_cert_t *id_cert;
/**@}*/
} or_handshake_state_t;
/** Subtype of connection_t for an "OR connection" -- that is, one that speaks
* cells over TLS. */
typedef struct or_connection_t {
connection_t base_;
/** Hash of the public RSA key for the other side's identity key, or zeroes
* if the other side hasn't shown us a valid identity key. */
char identity_digest[DIGEST_LEN];
char *nickname; /**< Nickname of OR on other side (if any). */
tor_tls_t *tls; /**< TLS connection state. */
int tls_error; /**< Last tor_tls error code. */
/** When we last used this conn for any client traffic. If not
* recent, we can rate limit it further. */
/* Channel using this connection */
channel_tls_t *chan;
tor_addr_t real_addr; /**< The actual address that this connection came from
* or went to. The <b>addr</b> field is prone to
* getting overridden by the address from the router
* descriptor matching <b>identity_digest</b>. */
/** Should this connection be used for extending circuits to the server
* matching the <b>identity_digest</b> field? Set to true if we're pretty
* sure we aren't getting MITMed, either because we're connected to an
* address listed in a server descriptor, or because an authenticated
* NETINFO cell listed the address we're connected to as recognized. */
unsigned int is_canonical:1;
/** True iff we have decided that the other end of this connection
* is a client. Connections with this flag set should never be used
* to satisfy an EXTEND request. */
unsigned int is_connection_with_client:1;
/** True iff this is an outgoing connection. */
unsigned int is_outgoing:1;
unsigned int proxy_type:2; /**< One of PROXY_NONE...PROXY_SOCKS5 */
uint8_t link_proto; /**< What protocol version are we using? 0 for
* "none negotiated yet." */
or_handshake_state_t *handshake_state; /**< If we are setting this connection
* up, state information to do so. */
time_t timestamp_lastempty; /**< When was the outbuf last completely empty?*/
time_t timestamp_last_added_nonpadding; /** When did we last add a
* non-padding cell to the outbuf? */
/* bandwidth* and *_bucket only used by ORs in OPEN state: */
int bandwidthrate; /**< Bytes/s added to the bucket. (OPEN ORs only.) */
int bandwidthburst; /**< Max bucket size for this conn. (OPEN ORs only.) */
#ifndef USE_BUFFEREVENTS
int read_bucket; /**< When this hits 0, stop receiving. Every second we
* add 'bandwidthrate' to this, capping it at
* bandwidthburst. (OPEN ORs only) */
int write_bucket; /**< When this hits 0, stop writing. Like read_bucket. */
#else
/** A rate-limiting configuration object to determine how this connection
* set its read- and write- limits. */
/* XXXX we could share this among all connections. */
struct ev_token_bucket_cfg *bucket_cfg;
#endif
struct or_connection_t *next_with_same_id; /**< Next connection with same
* identity digest as this one. */
} or_connection_t;
/** Subtype of connection_t for an "edge connection" -- that is, an entry (ap)
* connection, or an exit. */
typedef struct edge_connection_t {
connection_t base_;
struct edge_connection_t *next_stream; /**< Points to the next stream at this
* edge, if any */
int package_window; /**< How many more relay cells can I send into the
* circuit? */
int deliver_window; /**< How many more relay cells can end at me? */
struct circuit_t *on_circuit; /**< The circuit (if any) that this edge
* connection is using. */
/** A pointer to which node in the circ this conn exits at. Set for AP
* connections and for hidden service exit connections. */
struct crypt_path_t *cpath_layer;
/** What rendezvous service are we querying for (if an AP) or providing (if
* an exit)? */
rend_data_t *rend_data;
uint32_t address_ttl; /**< TTL for address-to-addr mapping on exit
* connection. Exit connections only. */
uint32_t begincell_flags; /** Flags sent or received in the BEGIN cell
* for this connection */
streamid_t stream_id; /**< The stream ID used for this edge connection on its
* circuit */
/** The reason why this connection is closing; passed to the controller. */
uint16_t end_reason;
/** Bytes read since last call to control_event_stream_bandwidth_used() */
uint32_t n_read;
/** Bytes written since last call to control_event_stream_bandwidth_used() */
uint32_t n_written;
/** True iff this connection is for a DNS request only. */
unsigned int is_dns_request:1;
/** True iff this connection is for a PTR DNS request. (exit only) */
unsigned int is_reverse_dns_lookup:1;
unsigned int edge_has_sent_end:1; /**< For debugging; only used on edge
* connections. Set once we've set the stream end,
* and check in connection_about_to_close_connection().
*/
/** True iff we've blocked reading until the circuit has fewer queued
* cells. */
unsigned int edge_blocked_on_circ:1;
/** Unique ID for directory requests; this used to be in connection_t, but
* that's going away and being used on channels instead. We still tag
* edge connections with dirreq_id from circuits, so it's copied here. */
uint64_t dirreq_id;
} edge_connection_t;
/** Subtype of edge_connection_t for an "entry connection" -- that is, a SOCKS
* connection, a DNS request, a TransPort connection or a NATD connection */
typedef struct entry_connection_t {
edge_connection_t edge_;
/** Nickname of planned exit node -- used with .exit support. */
char *chosen_exit_name;
socks_request_t *socks_request; /**< SOCKS structure describing request (AP
* only.) */
/* === Isolation related, AP only. === */
/** AP only: based on which factors do we isolate this stream? */
uint8_t isolation_flags;
/** AP only: what session group is this stream in? */
int session_group;
/** AP only: The newnym epoch in which we created this connection. */
unsigned nym_epoch;
/** AP only: The original requested address before we rewrote it. */
char *original_dest_address;
/* Other fields to isolate on already exist. The ClientAddr is addr. The
ClientProtocol is a combination of type and socks_request->
socks_version. SocksAuth is socks_request->username/password.
DestAddr is in socks_request->address. */
/** Number of times we've reassigned this application connection to
* a new circuit. We keep track because the timeout is longer if we've
* already retried several times. */
uint8_t num_socks_retries;
/** For AP connections only: buffer for data that we have sent
* optimistically, which we might need to re-send if we have to
* retry this connection. */
generic_buffer_t *pending_optimistic_data;
/* For AP connections only: buffer for data that we previously sent
* optimistically which we are currently re-sending as we retry this
* connection. */
generic_buffer_t *sending_optimistic_data;
/** If this is a DNSPort connection, this field holds the pending DNS
* request that we're going to try to answer. */
struct evdns_server_request *dns_server_request;
#define NUM_CIRCUITS_LAUNCHED_THRESHOLD 10
/** Number of times we've launched a circuit to handle this stream. If
* it gets too high, that could indicate an inconsistency between our
* "launch a circuit to handle this stream" logic and our "attach our
* stream to one of the available circuits" logic. */
unsigned int num_circuits_launched:4;
/** True iff this stream must attach to a one-hop circuit (e.g. for
* begin_dir). */
unsigned int want_onehop:1;
/** True iff this stream should use a BEGIN_DIR relay command to establish
* itself rather than BEGIN (either via onehop or via a whole circuit). */
unsigned int use_begindir:1;
/** For AP connections only. If 1, and we fail to reach the chosen exit,
* stop requiring it. */
unsigned int chosen_exit_optional:1;
/** For AP connections only. If non-zero, this exit node was picked as
* a result of the TrackHostExit, and the value decrements every time
* we fail to complete a circuit to our chosen exit -- if it reaches
* zero, abandon the associated mapaddress. */
unsigned int chosen_exit_retries:3;
/** True iff this is an AP connection that came from a transparent or
* NATd connection */
unsigned int is_transparent_ap:1;
/** For AP connections only: Set if this connection's target exit node
* allows optimistic data (that is, data sent on this stream before
* the exit has sent a CONNECTED cell) and we have chosen to use it.
*/
unsigned int may_use_optimistic_data : 1;
/** Should we permit IPv4 and IPv6 traffic to use this connection?
*
* @{ */
unsigned int ipv4_traffic_ok : 1;
unsigned int ipv6_traffic_ok : 1;
/** @} */
/** Should we say we prefer IPv6 traffic? */
unsigned int prefer_ipv6_traffic : 1;
} entry_connection_t;
/** Subtype of connection_t for an "directory connection" -- that is, an HTTP
* connection to retrieve or serve directory material. */
typedef struct dir_connection_t {
connection_t base_;
/** Which 'resource' did we ask the directory for? This is typically the part
* of the URL string that defines, relative to the directory conn purpose,
* what thing we want. For example, in router descriptor downloads by
* descriptor digest, it contains "d/", then one ore more +-separated
* fingerprints.
**/
char *requested_resource;
unsigned int dirconn_direct:1; /**< Is this dirconn direct, or via Tor? */
/* Used only for server sides of some dir connections, to implement
* "spooling" of directory material to the outbuf. Otherwise, we'd have
* to append everything to the outbuf in one enormous chunk. */
/** What exactly are we spooling right now? */
enum {
DIR_SPOOL_NONE=0, DIR_SPOOL_SERVER_BY_DIGEST, DIR_SPOOL_SERVER_BY_FP,
DIR_SPOOL_EXTRA_BY_DIGEST, DIR_SPOOL_EXTRA_BY_FP,
DIR_SPOOL_CACHED_DIR, DIR_SPOOL_NETWORKSTATUS,
DIR_SPOOL_MICRODESC, /* NOTE: if we add another entry, add another bit. */
} dir_spool_src : 3;
/** If we're fetching descriptors, what router purpose shall we assign
* to them? */
uint8_t router_purpose;
/** List of fingerprints for networkstatuses or descriptors to be spooled. */
smartlist_t *fingerprint_stack;
/** A cached_dir_t object that we're currently spooling out */
struct cached_dir_t *cached_dir;
/** The current offset into cached_dir. */
off_t cached_dir_offset;
/** The zlib object doing on-the-fly compression for spooled data. */
tor_zlib_state_t *zlib_state;
/** What rendezvous service are we querying for? */
rend_data_t *rend_data;
char identity_digest[DIGEST_LEN]; /**< Hash of the public RSA key for
* the directory server's signing key. */
/** Unique ID for directory requests; this used to be in connection_t, but
* that's going away and being used on channels instead. The dirserver still
* needs this for the incoming side, so it's moved here. */
uint64_t dirreq_id;
} dir_connection_t;
/** Subtype of connection_t for an connection to a controller. */
typedef struct control_connection_t {
connection_t base_;
uint32_t event_mask; /**< Bitfield: which events does this controller
* care about? */
/** True if we have sent a protocolinfo reply on this connection. */
unsigned int have_sent_protocolinfo:1;
/** True if we have received a takeownership command on this
* connection. */
unsigned int is_owning_control_connection:1;
/** If we have sent an AUTHCHALLENGE reply on this connection and
* have not received a successful AUTHENTICATE command, points to
* the value which the client must send to authenticate itself;
* otherwise, NULL. */
char *safecookie_client_hash;
/** Amount of space allocated in incoming_cmd. */
uint32_t incoming_cmd_len;
/** Number of bytes currently stored in incoming_cmd. */
uint32_t incoming_cmd_cur_len;
/** A control command that we're reading from the inbuf, but which has not
* yet arrived completely. */
char *incoming_cmd;
} control_connection_t;
/** Cast a connection_t subtype pointer to a connection_t **/
#define TO_CONN(c) (&(((c)->base_)))
/** Helper macro: Given a pointer to to.base_, of type from*, return &to. */
#define DOWNCAST(to, ptr) ((to*)SUBTYPE_P(ptr, to, base_))
/** Cast a entry_connection_t subtype pointer to a edge_connection_t **/
#define ENTRY_TO_EDGE_CONN(c) (&(((c))->edge_))
/** Cast a entry_connection_t subtype pointer to a connection_t **/
#define ENTRY_TO_CONN(c) (TO_CONN(ENTRY_TO_EDGE_CONN(c)))
/** Convert a connection_t* to an or_connection_t*; assert if the cast is
* invalid. */
static or_connection_t *TO_OR_CONN(connection_t *);
/** Convert a connection_t* to a dir_connection_t*; assert if the cast is
* invalid. */
static dir_connection_t *TO_DIR_CONN(connection_t *);
/** Convert a connection_t* to an edge_connection_t*; assert if the cast is
* invalid. */
static edge_connection_t *TO_EDGE_CONN(connection_t *);
/** Convert a connection_t* to an entry_connection_t*; assert if the cast is
* invalid. */
static entry_connection_t *TO_ENTRY_CONN(connection_t *);
/** Convert a edge_connection_t* to an entry_connection_t*; assert if the cast
* is invalid. */
static entry_connection_t *EDGE_TO_ENTRY_CONN(edge_connection_t *);
/** Convert a connection_t* to an control_connection_t*; assert if the cast is
* invalid. */
static control_connection_t *TO_CONTROL_CONN(connection_t *);
/** Convert a connection_t* to an listener_connection_t*; assert if the cast is
* invalid. */
static listener_connection_t *TO_LISTENER_CONN(connection_t *);
static INLINE or_connection_t *TO_OR_CONN(connection_t *c)
{
tor_assert(c->magic == OR_CONNECTION_MAGIC);
return DOWNCAST(or_connection_t, c);
}
static INLINE dir_connection_t *TO_DIR_CONN(connection_t *c)
{
tor_assert(c->magic == DIR_CONNECTION_MAGIC);
return DOWNCAST(dir_connection_t, c);
}
static INLINE edge_connection_t *TO_EDGE_CONN(connection_t *c)
{
tor_assert(c->magic == EDGE_CONNECTION_MAGIC ||
c->magic == ENTRY_CONNECTION_MAGIC);
return DOWNCAST(edge_connection_t, c);
}
static INLINE entry_connection_t *TO_ENTRY_CONN(connection_t *c)
{
tor_assert(c->magic == ENTRY_CONNECTION_MAGIC);
return (entry_connection_t*) SUBTYPE_P(c, entry_connection_t, edge_.base_);
}
static INLINE entry_connection_t *EDGE_TO_ENTRY_CONN(edge_connection_t *c)
{
tor_assert(c->base_.magic == ENTRY_CONNECTION_MAGIC);
return (entry_connection_t*) SUBTYPE_P(c, entry_connection_t, edge_);
}
static INLINE control_connection_t *TO_CONTROL_CONN(connection_t *c)
{
tor_assert(c->magic == CONTROL_CONNECTION_MAGIC);
return DOWNCAST(control_connection_t, c);
}
static INLINE listener_connection_t *TO_LISTENER_CONN(connection_t *c)
{
tor_assert(c->magic == LISTENER_CONNECTION_MAGIC);
return DOWNCAST(listener_connection_t, c);
}
/* Conditional macros to help write code that works whether bufferevents are
disabled or not.
We can't just write:
if (conn->bufev) {
do bufferevent stuff;
} else {
do other stuff;
}
because the bufferevent stuff won't even compile unless we have a fairly
new version of Libevent. Instead, we say:
IF_HAS_BUFFEREVENT(conn, { do_bufferevent_stuff } );
or:
IF_HAS_BUFFEREVENT(conn, {
do bufferevent stuff;
}) ELSE_IF_NO_BUFFEREVENT {
do non-bufferevent stuff;
}
If we're compiling with bufferevent support, then the macros expand more or
less to:
if (conn->bufev) {
do_bufferevent_stuff;
} else {
do non-bufferevent stuff;
}
and if we aren't using bufferevents, they expand more or less to:
{ do non-bufferevent stuff; }
*/
#ifdef USE_BUFFEREVENTS
#define HAS_BUFFEREVENT(c) (((c)->bufev) != NULL)
#define IF_HAS_BUFFEREVENT(c, stmt) \
if ((c)->bufev) do { \
stmt ; \
} while (0)
#define ELSE_IF_NO_BUFFEREVENT ; else
#define IF_HAS_NO_BUFFEREVENT(c) \
if (NULL == (c)->bufev)
#else
#define HAS_BUFFEREVENT(c) (0)
#define IF_HAS_BUFFEREVENT(c, stmt) (void)0
#define ELSE_IF_NO_BUFFEREVENT ;
#define IF_HAS_NO_BUFFEREVENT(c) \
if (1)
#endif
/** What action type does an address policy indicate: accept or reject? */
typedef enum {
ADDR_POLICY_ACCEPT=1,
ADDR_POLICY_REJECT=2,
} addr_policy_action_t;
/** A reference-counted address policy rule. */
typedef struct addr_policy_t {
int refcnt; /**< Reference count */
addr_policy_action_t policy_type:2;/**< What to do when the policy matches.*/
unsigned int is_private:1; /**< True iff this is the pseudo-address,
* "private". */
unsigned int is_canonical:1; /**< True iff this policy is the canonical
* copy (stored in a hash table to avoid
* duplication of common policies) */
maskbits_t maskbits; /**< Accept/reject all addresses <b>a</b> such that the
* first <b>maskbits</b> bits of <b>a</b> match
* <b>addr</b>. */
/** Base address to accept or reject.
*
* Note that wildcards are treated
* differntly depending on address family. An AF_UNSPEC address means
* "All addresses, IPv4 or IPv6." An AF_INET address with maskbits==0 means
* "All IPv4 addresses" and an AF_INET6 address with maskbits == 0 means
* "All IPv6 addresses".
**/
tor_addr_t addr;
uint16_t prt_min; /**< Lowest port number to accept/reject. */
uint16_t prt_max; /**< Highest port number to accept/reject. */
} addr_policy_t;
/** A cached_dir_t represents a cacheable directory object, along with its
* compressed form. */
typedef struct cached_dir_t {
char *dir; /**< Contents of this object, NUL-terminated. */
char *dir_z; /**< Compressed contents of this object. */
size_t dir_len; /**< Length of <b>dir</b> (not counting its NUL). */
size_t dir_z_len; /**< Length of <b>dir_z</b>. */
time_t published; /**< When was this object published. */
digests_t digests; /**< Digests of this object (networkstatus only) */
int refcnt; /**< Reference count for this cached_dir_t. */
} cached_dir_t;
/** Enum used to remember where a signed_descriptor_t is stored and how to
* manage the memory for signed_descriptor_body. */
typedef enum {
/** The descriptor isn't stored on disk at all: the copy in memory is
* canonical; the saved_offset field is meaningless. */
SAVED_NOWHERE=0,
/** The descriptor is stored in the cached_routers file: the
* signed_descriptor_body is meaningless; the signed_descriptor_len and
* saved_offset are used to index into the mmaped cache file. */
SAVED_IN_CACHE,
/** The descriptor is stored in the cached_routers.new file: the
* signed_descriptor_body and saved_offset fields are both set. */
/* FFFF (We could also mmap the file and grow the mmap as needed, or
* lazy-load the descriptor text by using seek and read. We don't, for
* now.)
*/
SAVED_IN_JOURNAL
} saved_location_t;
/** Enumeration: what kind of download schedule are we using for a given
* object? */
typedef enum {
DL_SCHED_GENERIC = 0,
DL_SCHED_CONSENSUS = 1,
DL_SCHED_BRIDGE = 2,
} download_schedule_t;
/** Information about our plans for retrying downloads for a downloadable
* object. */
typedef struct download_status_t {
time_t next_attempt_at; /**< When should we try downloading this descriptor
* again? */
uint8_t n_download_failures; /**< Number of failures trying to download the
* most recent descriptor. */
download_schedule_t schedule : 8;
} download_status_t;
/** If n_download_failures is this high, the download can never happen. */
#define IMPOSSIBLE_TO_DOWNLOAD 255
/** The max size we expect router descriptor annotations we create to
* be. We'll accept larger ones if we see them on disk, but we won't
* create any that are larger than this. */
#define ROUTER_ANNOTATION_BUF_LEN 256
/** Information need to cache an onion router's descriptor. */
typedef struct signed_descriptor_t {
/** Pointer to the raw server descriptor, preceded by annotations. Not
* necessarily NUL-terminated. If saved_location is SAVED_IN_CACHE, this
* pointer is null. */
char *signed_descriptor_body;
/** Length of the annotations preceding the server descriptor. */
size_t annotations_len;
/** Length of the server descriptor. */
size_t signed_descriptor_len;
/** Digest of the server descriptor, computed as specified in
* dir-spec.txt. */
char signed_descriptor_digest[DIGEST_LEN];
/** Identity digest of the router. */
char identity_digest[DIGEST_LEN];
/** Declared publication time of the descriptor. */
time_t published_on;
/** For routerdescs only: digest of the corresponding extrainfo. */
char extra_info_digest[DIGEST_LEN];
/** For routerdescs only: Status of downloading the corresponding
* extrainfo. */
download_status_t ei_dl_status;
/** Where is the descriptor saved? */
saved_location_t saved_location;
/** If saved_location is SAVED_IN_CACHE or SAVED_IN_JOURNAL, the offset of
* this descriptor in the corresponding file. */
off_t saved_offset;
/** What position is this descriptor within routerlist->routers or
* routerlist->old_routers? -1 for none. */
int routerlist_index;
/** The valid-until time of the most recent consensus that listed this
* descriptor, or a bit after the publication time of the most recent v2
* networkstatus that listed it. 0 for "never listed in a consensus or
* status, so far as we know." */
time_t last_listed_as_valid_until;
/* If true, we do not ever try to save this object in the cache. */
unsigned int do_not_cache : 1;
/* If true, this item is meant to represent an extrainfo. */
unsigned int is_extrainfo : 1;
/* If true, we got an extrainfo for this item, and the digest was right,
* but it was incompatible. */
unsigned int extrainfo_is_bogus : 1;
/* If true, we are willing to transmit this item unencrypted. */
unsigned int send_unencrypted : 1;
} signed_descriptor_t;
/** A signed integer representing a country code. */
typedef int16_t country_t;
/** Information about another onion router in the network. */
typedef struct {
signed_descriptor_t cache_info;
char *address; /**< Location of OR: either a hostname or an IP address. */
char *nickname; /**< Human-readable OR name. */
uint32_t addr; /**< IPv4 address of OR, in host order. */
uint16_t or_port; /**< Port for TLS connections. */
uint16_t dir_port; /**< Port for HTTP directory connections. */
/** A router's IPv6 address, if it has one. */
/* XXXXX187 Actually these should probably be part of a list of addresses,
* not just a special case. Use abstractions to access these; don't do it
* directly. */
tor_addr_t ipv6_addr;
uint16_t ipv6_orport;
crypto_pk_t *onion_pkey; /**< Public RSA key for onions. */
crypto_pk_t *identity_pkey; /**< Public RSA key for signing. */
char *platform; /**< What software/operating system is this OR using? */
/* link info */
uint32_t bandwidthrate; /**< How many bytes does this OR add to its token
* bucket per second? */
uint32_t bandwidthburst; /**< How large is this OR's token bucket? */
/** How many bytes/s is this router known to handle? */
uint32_t bandwidthcapacity;
smartlist_t *exit_policy; /**< What streams will this OR permit
* to exit on IPv4? NULL for 'reject *:*'. */
/** What streams will this OR permit to exit on IPv6?
* NULL for 'reject *:*' */
struct short_policy_t *ipv6_exit_policy;
long uptime; /**< How many seconds the router claims to have been up */
smartlist_t *declared_family; /**< Nicknames of router which this router
* claims are its family. */
char *contact_info; /**< Declared contact info for this router. */
unsigned int is_hibernating:1; /**< Whether the router claims to be
* hibernating */
unsigned int caches_extra_info:1; /**< Whether the router says it caches and
* serves extrainfo documents. */
unsigned int allow_single_hop_exits:1; /**< Whether the router says
* it allows single hop exits. */
unsigned int wants_to_be_hs_dir:1; /**< True iff this router claims to be
* a hidden service directory. */
unsigned int policy_is_reject_star:1; /**< True iff the exit policy for this
* router rejects everything. */
/** True if, after we have added this router, we should re-launch
* tests for it. */
unsigned int needs_retest_if_added:1;
/** Tor can use this router for general positions in circuits; we got it
* from a directory server as usual, or we're an authority and a server
* uploaded it. */
#define ROUTER_PURPOSE_GENERAL 0
/** Tor should avoid using this router for circuit-building: we got it
* from a crontroller. If the controller wants to use it, it'll have to
* ask for it by identity. */
#define ROUTER_PURPOSE_CONTROLLER 1
/** Tor should use this router only for bridge positions in circuits: we got
* it via a directory request from the bridge itself, or a bridge
* authority. x*/
#define ROUTER_PURPOSE_BRIDGE 2
/** Tor should not use this router; it was marked in cached-descriptors with
* a purpose we didn't recognize. */
#define ROUTER_PURPOSE_UNKNOWN 255
/* In what way did we find out about this router? One of ROUTER_PURPOSE_*.
* Routers of different purposes are kept segregated and used for different
* things; see notes on ROUTER_PURPOSE_* macros above.
*/
uint8_t purpose;
} routerinfo_t;
/** Information needed to keep and cache a signed extra-info document. */
typedef struct extrainfo_t {
signed_descriptor_t cache_info;
/** The router's nickname. */
char nickname[MAX_NICKNAME_LEN+1];
/** True iff we found the right key for this extra-info, verified the
* signature, and found it to be bad. */
unsigned int bad_sig : 1;
/** If present, we didn't have the right key to verify this extra-info,
* so this is a copy of the signature in the document. */
char *pending_sig;
/** Length of pending_sig. */
size_t pending_sig_len;
} extrainfo_t;
/** Contents of a single router entry in a network status object.
*/
typedef struct routerstatus_t {
time_t published_on; /**< When was this router published? */
char nickname[MAX_NICKNAME_LEN+1]; /**< The nickname this router says it
* has. */
char identity_digest[DIGEST_LEN]; /**< Digest of the router's identity
* key. */
/** Digest of the router's most recent descriptor or microdescriptor.
* If it's a descriptor, we only use the first DIGEST_LEN bytes. */
char descriptor_digest[DIGEST256_LEN];
uint32_t addr; /**< IPv4 address for this router. */
uint16_t or_port; /**< OR port for this router. */
uint16_t dir_port; /**< Directory port for this router. */
tor_addr_t ipv6_addr; /**< IPv6 address for this router. */
uint16_t ipv6_orport; /**<IPV6 OR port for this router. */
unsigned int is_authority:1; /**< True iff this router is an authority. */
unsigned int is_exit:1; /**< True iff this router is a good exit. */
unsigned int is_stable:1; /**< True iff this router stays up a long time. */
unsigned int is_fast:1; /**< True iff this router has good bandwidth. */
/** True iff this router is called 'running' in the consensus. We give it
* this funny name so that we don't accidentally use this bit as a view of
* whether we think the router is *currently* running. If that's what you
* want to know, look at is_running in node_t. */
unsigned int is_flagged_running:1;
unsigned int is_named:1; /**< True iff "nickname" belongs to this router. */
unsigned int is_unnamed:1; /**< True iff "nickname" belongs to another
* router. */
unsigned int is_valid:1; /**< True iff this router isn't invalid. */
unsigned int is_v2_dir:1; /**< True iff this router can serve directory
* information with v2 of the directory
* protocol. (All directory caches cache v1
* directories.) */
unsigned int is_possible_guard:1; /**< True iff this router would be a good
* choice as an entry guard. */
unsigned int is_bad_exit:1; /**< True iff this node is a bad choice for
* an exit node. */
unsigned int is_bad_directory:1; /**< Do we think this directory is junky,
* underpowered, or otherwise useless? */
unsigned int is_hs_dir:1; /**< True iff this router is a v2-or-later hidden
* service directory. */
/** True iff we know version info for this router. (i.e., a "v" entry was
* included.) We'll replace all these with a big tor_version_t or a char[]
* if the number of traits we care about ever becomes incredibly big. */
unsigned int version_known:1;
/** True iff this router is a version that, if it caches directory info,
* we can get microdescriptors from. */
unsigned int version_supports_microdesc_cache:1;
/** True iff this router is a version that allows DATA cells to arrive on
* a stream before it has sent a CONNECTED cell. */
unsigned int version_supports_optimistic_data:1;
unsigned int has_bandwidth:1; /**< The vote/consensus had bw info */
unsigned int has_exitsummary:1; /**< The vote/consensus had exit summaries */
unsigned int has_measured_bw:1; /**< The vote/consensus had a measured bw */
uint32_t measured_bw; /**< Measured bandwidth (capacity) of the router */
uint32_t bandwidth; /**< Bandwidth (capacity) of the router as reported in
* the vote/consensus, in kilobytes/sec. */
char *exitsummary; /**< exit policy summary -
* XXX weasel: this probably should not stay a string. */
/* ---- The fields below aren't derived from the networkstatus; they
* hold local information only. */
/** True if we, as a directory mirror, want to download the corresponding
* routerinfo from the authority who gave us this routerstatus. (That is,
* if we don't have the routerinfo, and if we haven't already tried to get it
* from this authority.) Applies in v2 networkstatus document only.
*/
unsigned int need_to_mirror:1;
time_t last_dir_503_at; /**< When did this router last tell us that it
* was too busy to serve directory info? */
download_status_t dl_status;
} routerstatus_t;
/** A single entry in a parsed policy summary, describing a range of ports. */
typedef struct short_policy_entry_t {
uint16_t min_port, max_port;
} short_policy_entry_t;
/** A short_poliy_t is the parsed version of a policy summary. */
typedef struct short_policy_t {
/** True if the members of 'entries' are port ranges to accept; false if
* they are port ranges to reject */
unsigned int is_accept : 1;
/** The actual number of values in 'entries'. */
unsigned int n_entries : 31;
/** An array of 0 or more short_policy_entry_t values, each describing a
* range of ports that this policy accepts or rejects (depending on the
* value of is_accept).
*/
short_policy_entry_t entries[FLEXIBLE_ARRAY_MEMBER];
} short_policy_t;
/** A microdescriptor is the smallest amount of information needed to build a
* circuit through a router. They are generated by the directory authorities,
* using information from the uploaded routerinfo documents. They are not
* self-signed, but are rather authenticated by having their hash in a signed
* networkstatus document. */
typedef struct microdesc_t {
/** Hashtable node, used to look up the microdesc by its digest. */
HT_ENTRY(microdesc_t) node;
/* Cache information */
/** When was this microdescriptor last listed in a consensus document?
* Once a microdesc has been unlisted long enough, we can drop it.
*/
time_t last_listed;
/** Where is this microdescriptor currently stored? */
saved_location_t saved_location : 3;
/** If true, do not attempt to cache this microdescriptor on disk. */
unsigned int no_save : 1;
/** If true, this microdesc has an entry in the microdesc_map */
unsigned int held_in_map : 1;
/** Reference count: how many node_ts have a reference to this microdesc? */
unsigned int held_by_nodes;
/** If saved_location == SAVED_IN_CACHE, this field holds the offset of the
* microdescriptor in the cache. */
off_t off;
/* The string containing the microdesc. */
/** A pointer to the encoded body of the microdescriptor. If the
* saved_location is SAVED_IN_CACHE, then the body is a pointer into an
* mmap'd region. Otherwise, it is a malloc'd string. The string might not
* be NUL-terminated; take the length from <b>bodylen</b>. */
char *body;
/** The length of the microdescriptor in <b>body</b>. */
size_t bodylen;
/** A SHA256-digest of the microdescriptor. */
char digest[DIGEST256_LEN];
/* Fields in the microdescriptor. */
/** As routerinfo_t.onion_pkey */
crypto_pk_t *onion_pkey;
/** As routerinfo_t.ipv6_add */
tor_addr_t ipv6_addr;
/** As routerinfo_t.ipv6_orport */
uint16_t ipv6_orport;
/** As routerinfo_t.family */
smartlist_t *family;
/** IPv4 exit policy summary */
short_policy_t *exit_policy;
/** IPv6 exit policy summary */
short_policy_t *ipv6_exit_policy;
} microdesc_t;
/** A node_t represents a Tor router.
*
* Specifically, a node_t is a Tor router as we are using it: a router that
* we are considering for circuits, connections, and so on. A node_t is a
* thin wrapper around the routerstatus, routerinfo, and microdesc for a
* single wrapper, and provides a consistent interface for all of them.
*
* Also, a node_t has mutable state. While a routerinfo, a routerstatus,
* and a microdesc have[*] only the information read from a router
* descriptor, a consensus entry, and a microdescriptor (respectively)...
* a node_t has flags based on *our own current opinion* of the node.
*
* [*] Actually, there is some leftover information in each that is mutable.
* We should try to excise that.
*/
typedef struct node_t {
/* Indexing information */
/** Used to look up the node_t by its identity digest. */
HT_ENTRY(node_t) ht_ent;
/** Position of the node within the list of nodes */
int nodelist_idx;
/** The identity digest of this node_t. No more than one node_t per
* identity may exist at a time. */
char identity[DIGEST_LEN];
microdesc_t *md;
routerinfo_t *ri;
routerstatus_t *rs;
/* local info: copied from routerstatus, then possibly frobbed based
* on experience. Authorities set this stuff directly. Note that
* these reflect knowledge of the primary (IPv4) OR port only. */
unsigned int is_running:1; /**< As far as we know, is this OR currently
* running? */
unsigned int is_valid:1; /**< Has a trusted dirserver validated this OR?
* (For Authdir: Have we validated this OR?) */
unsigned int is_fast:1; /** Do we think this is a fast OR? */
unsigned int is_stable:1; /** Do we think this is a stable OR? */
unsigned int is_possible_guard:1; /**< Do we think this is an OK guard? */
unsigned int is_exit:1; /**< Do we think this is an OK exit? */
unsigned int is_bad_exit:1; /**< Do we think this exit is censored, borked,
* or otherwise nasty? */
unsigned int is_bad_directory:1; /**< Do we think this directory is junky,
* underpowered, or otherwise useless? */
unsigned int is_hs_dir:1; /**< True iff this router is a hidden service
* directory according to the authorities. */
/* Local info: warning state. */
unsigned int name_lookup_warned:1; /**< Have we warned the user for referring
* to this (unnamed) router by nickname?
*/
/** Local info: we treat this node as if it rejects everything */
unsigned int rejects_all:1;
/* Local info: derived. */
/** True if the IPv6 OR port is preferred over the IPv4 OR port. */
unsigned int ipv6_preferred:1;
/** According to the geoip db what country is this router in? */
/* XXXprop186 what is this suppose to mean with multiple OR ports? */
country_t country;
/* The below items are used only by authdirservers for
* reachability testing. */
/** When was the last time we could reach this OR? */
time_t last_reachable; /* IPv4. */
time_t last_reachable6; /* IPv6. */
} node_t;
/** How many times will we try to download a router's descriptor before giving
* up? */
#define MAX_ROUTERDESC_DOWNLOAD_FAILURES 8
/** How many times will we try to download a microdescriptor before giving
* up? */
#define MAX_MICRODESC_DOWNLOAD_FAILURES 8
/** Contents of a v2 (non-consensus, non-vote) network status object. */
typedef struct networkstatus_v2_t {
/** When did we receive the network-status document? */
time_t received_on;
/** What was the digest of the document? */
char networkstatus_digest[DIGEST_LEN];
/* These fields come from the actual network-status document.*/
time_t published_on; /**< Declared publication date. */
char *source_address; /**< Canonical directory server hostname. */
uint32_t source_addr; /**< Canonical directory server IP. */
uint16_t source_dirport; /**< Canonical directory server dirport. */
unsigned int binds_names:1; /**< True iff this directory server binds
* names. */
unsigned int recommends_versions:1; /**< True iff this directory server
* recommends client and server software
* versions. */
unsigned int lists_bad_exits:1; /**< True iff this directory server marks
* malfunctioning exits as bad. */
/** True iff this directory server marks malfunctioning directories as
* bad. */
unsigned int lists_bad_directories:1;
char identity_digest[DIGEST_LEN]; /**< Digest of signing key. */
char *contact; /**< How to contact directory admin? (may be NULL). */
crypto_pk_t *signing_key; /**< Key used to sign this directory. */
char *client_versions; /**< comma-separated list of recommended client
* versions. */
char *server_versions; /**< comma-separated list of recommended server
* versions. */
smartlist_t *entries; /**< List of routerstatus_t*. This list is kept
* sorted by identity_digest. */
} networkstatus_v2_t;
/** Linked list of microdesc hash lines for a single router in a directory
* vote.
*/
typedef struct vote_microdesc_hash_t {
/** Next element in the list, or NULL. */
struct vote_microdesc_hash_t *next;
/** The raw contents of the microdesc hash line, excluding the "m". */
char *microdesc_hash_line;
} vote_microdesc_hash_t;
/** The claim about a single router, made in a vote. */
typedef struct vote_routerstatus_t {
routerstatus_t status; /**< Underlying 'status' object for this router.
* Flags are redundant. */
/** How many known-flags are allowed in a vote? This is the width of
* the flags field of vote_routerstatus_t */
#define MAX_KNOWN_FLAGS_IN_VOTE 64
uint64_t flags; /**< Bit-field for all recognized flags; index into
* networkstatus_t.known_flags. */
char *version; /**< The version that the authority says this router is
* running. */
/** The hash or hashes that the authority claims this microdesc has. */
vote_microdesc_hash_t *microdesc;
} vote_routerstatus_t;
/** A signature of some document by an authority. */
typedef struct document_signature_t {
/** Declared SHA-1 digest of this voter's identity key */
char identity_digest[DIGEST_LEN];
/** Declared SHA-1 digest of signing key used by this voter. */
char signing_key_digest[DIGEST_LEN];
/** Algorithm used to compute the digest of the document. */
digest_algorithm_t alg;
/** Signature of the signed thing. */
char *signature;
/** Length of <b>signature</b> */
int signature_len;
unsigned int bad_signature : 1; /**< Set to true if we've tried to verify
* the sig, and we know it's bad. */
unsigned int good_signature : 1; /**< Set to true if we've verified the sig
* as good. */
} document_signature_t;
/** Information about a single voter in a vote or a consensus. */
typedef struct networkstatus_voter_info_t {
/** Declared SHA-1 digest of this voter's identity key */
char identity_digest[DIGEST_LEN];
char *nickname; /**< Nickname of this voter */
/** Digest of this voter's "legacy" identity key, if any. In vote only; for
* consensuses, we treat legacy keys as additional signers. */
char legacy_id_digest[DIGEST_LEN];
char *address; /**< Address of this voter, in string format. */
uint32_t addr; /**< Address of this voter, in IPv4, in host order. */
uint16_t dir_port; /**< Directory port of this voter */
uint16_t or_port; /**< OR port of this voter */
char *contact; /**< Contact information for this voter. */
char vote_digest[DIGEST_LEN]; /**< Digest of this voter's vote, as signed. */
/* Nothing from here on is signed. */
/** The signature of the document and the signature's status. */
smartlist_t *sigs;
} networkstatus_voter_info_t;
/** Enumerates the possible seriousness values of a networkstatus document. */
typedef enum {
NS_TYPE_VOTE,
NS_TYPE_CONSENSUS,
NS_TYPE_OPINION,
} networkstatus_type_t;
/** Enumerates recognized flavors of a consensus networkstatus document. All
* flavors of a consensus are generated from the same set of votes, but they
* present different types information to different versions of Tor. */
typedef enum {
FLAV_NS = 0,
FLAV_MICRODESC = 1,
} consensus_flavor_t;
/** How many different consensus flavors are there? */
#define N_CONSENSUS_FLAVORS ((int)(FLAV_MICRODESC)+1)
/** A common structure to hold a v3 network status vote, or a v3 network
* status consensus. */
typedef struct networkstatus_t {
networkstatus_type_t type : 8; /**< Vote, consensus, or opinion? */
consensus_flavor_t flavor : 8; /**< If a consensus, what kind? */
time_t published; /**< Vote only: Time when vote was written. */
time_t valid_after; /**< Time after which this vote or consensus applies. */
time_t fresh_until; /**< Time before which this is the most recent vote or
* consensus. */
time_t valid_until; /**< Time after which this vote or consensus should not
* be used. */
/** Consensus only: what method was used to produce this consensus? */
int consensus_method;
/** Vote only: what methods is this voter willing to use? */
smartlist_t *supported_methods;
/** How long does this vote/consensus claim that authorities take to
* distribute their votes to one another? */
int vote_seconds;
/** How long does this vote/consensus claim that authorities take to
* distribute their consensus signatures to one another? */
int dist_seconds;
/** Comma-separated list of recommended client software, or NULL if this
* voter has no opinion. */
char *client_versions;
char *server_versions;
/** List of flags that this vote/consensus applies to routers. If a flag is
* not listed here, the voter has no opinion on what its value should be. */
smartlist_t *known_flags;
/** List of key=value strings for the parameters in this vote or
* consensus, sorted by key. */
smartlist_t *net_params;
/** List of key=value strings for the bw weight parameters in the
* consensus. */
smartlist_t *weight_params;
/** List of networkstatus_voter_info_t. For a vote, only one element
* is included. For a consensus, one element is included for every voter
* whose vote contributed to the consensus. */
smartlist_t *voters;
struct authority_cert_t *cert; /**< Vote only: the voter's certificate. */
/** Digests of this document, as signed. */
digests_t digests;
/** List of router statuses, sorted by identity digest. For a vote,
* the elements are vote_routerstatus_t; for a consensus, the elements
* are routerstatus_t. */
smartlist_t *routerstatus_list;
/** If present, a map from descriptor digest to elements of
* routerstatus_list. */
digestmap_t *desc_digest_map;
} networkstatus_t;
/** A set of signatures for a networkstatus consensus. Unless otherwise
* noted, all fields are as for networkstatus_t. */
typedef struct ns_detached_signatures_t {
time_t valid_after;
time_t fresh_until;
time_t valid_until;
strmap_t *digests; /**< Map from flavor name to digestset_t */
strmap_t *signatures; /**< Map from flavor name to list of
* document_signature_t */
} ns_detached_signatures_t;
/** Allowable types of desc_store_t. */
typedef enum store_type_t {
ROUTER_STORE = 0,
EXTRAINFO_STORE = 1
} store_type_t;
/** A 'store' is a set of descriptors saved on disk, with accompanying
* journal, mmaped as needed, rebuilt as needed. */
typedef struct desc_store_t {
/** Filename (within DataDir) for the store. We append .tmp to this
* filename for a temporary file when rebuilding the store, and .new to this
* filename for the journal. */
const char *fname_base;
/** Alternative (obsolete) value for fname_base: if the file named by
* fname_base isn't present, we read from here instead, but we never write
* here. */
const char *fname_alt_base;
/** Human-readable description of what this store contains. */
const char *description;
tor_mmap_t *mmap; /**< A mmap for the main file in the store. */
store_type_t type; /**< What's stored in this store? */
/** The size of the router log, in bytes. */
size_t journal_len;
/** The size of the router store, in bytes. */
size_t store_len;
/** Total bytes dropped since last rebuild: this is space currently
* used in the cache and the journal that could be freed by a rebuild. */
size_t bytes_dropped;
} desc_store_t;
/** Contents of a directory of onion routers. */
typedef struct {
/** Map from server identity digest to a member of routers. */
struct digest_ri_map_t *identity_map;
/** Map from server descriptor digest to a signed_descriptor_t from
* routers or old_routers. */
struct digest_sd_map_t *desc_digest_map;
/** Map from extra-info digest to an extrainfo_t. Only exists for
* routers in routers or old_routers. */
struct digest_ei_map_t *extra_info_map;
/** Map from extra-info digests to a signed_descriptor_t for a router
* descriptor having that extra-info digest. Only exists for
* routers in routers or old_routers. */
struct digest_sd_map_t *desc_by_eid_map;
/** List of routerinfo_t for all currently live routers we know. */
smartlist_t *routers;
/** List of signed_descriptor_t for older router descriptors we're
* caching. */
smartlist_t *old_routers;
/** Store holding server descriptors. If present, any router whose
* cache_info.saved_location == SAVED_IN_CACHE is stored in this file
* starting at cache_info.saved_offset */
desc_store_t desc_store;
/** Store holding extra-info documents. */
desc_store_t extrainfo_store;
} routerlist_t;
/** Information on router used when extending a circuit. We don't need a
* full routerinfo_t to extend: we only need addr:port:keyid to build an OR
* connection, and onion_key to create the onionskin. Note that for onehop
* general-purpose tunnels, the onion_key is NULL. */
typedef struct extend_info_t {
char nickname[MAX_HEX_NICKNAME_LEN+1]; /**< This router's nickname for
* display. */
char identity_digest[DIGEST_LEN]; /**< Hash of this router's identity key. */
uint16_t port; /**< OR port. */
tor_addr_t addr; /**< IP address. */
crypto_pk_t *onion_key; /**< Current onionskin key. */
} extend_info_t;
/** Certificate for v3 directory protocol: binds long-term authority identity
* keys to medium-term authority signing keys. */
typedef struct authority_cert_t {
/** Information relating to caching this cert on disk and looking it up. */
signed_descriptor_t cache_info;
/** This authority's long-term authority identity key. */
crypto_pk_t *identity_key;
/** This authority's medium-term signing key. */
crypto_pk_t *signing_key;
/** The digest of <b>signing_key</b> */
char signing_key_digest[DIGEST_LEN];
/** The listed expiration time of this certificate. */
time_t expires;
/** This authority's IPv4 address, in host order. */
uint32_t addr;
/** This authority's directory port. */
uint16_t dir_port;
/** True iff this certificate was cross-certified by signing the identity
* key with the signing key. */
uint8_t is_cross_certified;
} authority_cert_t;
/** Bitfield enum type listing types of information that directory authorities
* can be authoritative about, and that directory caches may or may not cache.
*
* Note that the granularity here is based on authority granularity and on
* cache capabilities. Thus, one particular bit may correspond in practice to
* a few types of directory info, so long as every authority that pronounces
* officially about one of the types prounounces officially about all of them,
* and so long as every cache that caches one of them caches all of them.
*/
typedef enum {
NO_DIRINFO = 0,
/** Serves/signs v1 directory information: Big lists of routers, and short
* routerstatus documents. */
V1_DIRINFO = 1 << 0,
/** Serves/signs v2 directory information: i.e. v2 networkstatus documents */
V2_DIRINFO = 1 << 1,
/** Serves/signs v3 directory information: votes, consensuses, certs */
V3_DIRINFO = 1 << 2,
/** Serves hidden service descriptors. */
HIDSERV_DIRINFO = 1 << 3,
/** Serves bridge descriptors. */
BRIDGE_DIRINFO = 1 << 4,
/** Serves extrainfo documents. */
EXTRAINFO_DIRINFO=1 << 5,
/** Serves microdescriptors. */
MICRODESC_DIRINFO=1 << 6,
} dirinfo_type_t;
#define ALL_DIRINFO ((dirinfo_type_t)((1<<7)-1))
#define CRYPT_PATH_MAGIC 0x70127012u
/** Holds accounting information for a single step in the layered encryption
* performed by a circuit. Used only at the client edge of a circuit. */
typedef struct crypt_path_t {
uint32_t magic;
/* crypto environments */
/** Encryption key and counter for cells heading towards the OR at this
* step. */
crypto_cipher_t *f_crypto;
/** Encryption key and counter for cells heading back from the OR at this
* step. */
crypto_cipher_t *b_crypto;
/** Digest state for cells heading towards the OR at this step. */
crypto_digest_t *f_digest; /* for integrity checking */
/** Digest state for cells heading away from the OR at this step. */
crypto_digest_t *b_digest;
/** Current state of Diffie-Hellman key negotiation with the OR at this
* step. */
crypto_dh_t *dh_handshake_state;
/** Current state of 'fast' (non-PK) key negotiation with the OR at this
* step. Used to save CPU when TLS is already providing all the
* authentication, secrecy, and integrity we need, and we're already
* distinguishable from an OR.
*/
uint8_t fast_handshake_state[DIGEST_LEN];
/** Negotiated key material shared with the OR at this step. */
char handshake_digest[DIGEST_LEN];/* KH in tor-spec.txt */
/** Information to extend to the OR at this step. */
extend_info_t *extend_info;
/** Is the circuit built to this step? Must be one of:
* - CPATH_STATE_CLOSED (The circuit has not been extended to this step)
* - CPATH_STATE_AWAITING_KEYS (We have sent an EXTEND/CREATE to this step
* and not received an EXTENDED/CREATED)
* - CPATH_STATE_OPEN (The circuit has been extended to this step) */
uint8_t state;
#define CPATH_STATE_CLOSED 0
#define CPATH_STATE_AWAITING_KEYS 1
#define CPATH_STATE_OPEN 2
struct crypt_path_t *next; /**< Link to next crypt_path_t in the circuit.
* (The list is circular, so the last node
* links to the first.) */
struct crypt_path_t *prev; /**< Link to previous crypt_path_t in the
* circuit. */
int package_window; /**< How many cells are we allowed to originate ending
* at this step? */
int deliver_window; /**< How many cells are we willing to deliver originating
* at this step? */
} crypt_path_t;
/** A reference-counted pointer to a crypt_path_t, used only to share
* the final rendezvous cpath to be used on a service-side rendezvous
* circuit among multiple circuits built in parallel to the same
* destination rendezvous point. */
typedef struct {
/** The reference count. */
unsigned int refcount;
/** The pointer. Set to NULL when the crypt_path_t is put into use
* on an opened rendezvous circuit. */
crypt_path_t *cpath;
} crypt_path_reference_t;
#define CPATH_KEY_MATERIAL_LEN (20*2+16*2)
#define DH_KEY_LEN DH_BYTES
#define ONIONSKIN_CHALLENGE_LEN (PKCS1_OAEP_PADDING_OVERHEAD+\
CIPHER_KEY_LEN+\
DH_KEY_LEN)
#define ONIONSKIN_REPLY_LEN (DH_KEY_LEN+DIGEST_LEN)
/** Information used to build a circuit. */
typedef struct {
/** Intended length of the final circuit. */
int desired_path_len;
/** How to extend to the planned exit node. */
extend_info_t *chosen_exit;
/** Whether every node in the circ must have adequate uptime. */
unsigned int need_uptime : 1;
/** Whether every node in the circ must have adequate capacity. */
unsigned int need_capacity : 1;
/** Whether the last hop was picked with exiting in mind. */
unsigned int is_internal : 1;
/** Did we pick this as a one-hop tunnel (not safe for other streams)?
* These are for encrypted dir conns that exit to this router, not
* for arbitrary exits from the circuit. */
unsigned int onehop_tunnel : 1;
/** The crypt_path_t to append after rendezvous: used for rendezvous. */
crypt_path_t *pending_final_cpath;
/** A ref-counted reference to the crypt_path_t to append after
* rendezvous; used on the service side. */
crypt_path_reference_t *service_pending_final_cpath_ref;
/** How many times has building a circuit for this task failed? */
int failure_count;
/** At what time should we give up on this task? */
time_t expiry_time;
} cpath_build_state_t;
#define ORIGIN_CIRCUIT_MAGIC 0x35315243u
#define OR_CIRCUIT_MAGIC 0x98ABC04Fu
/**
* A circuit is a path over the onion routing
* network. Applications can connect to one end of the circuit, and can
* create exit connections at the other end of the circuit. AP and exit
* connections have only one circuit associated with them (and thus these
* connection types are closed when the circuit is closed), whereas
* OR connections multiplex many circuits at once, and stay standing even
* when there are no circuits running over them.
*
* A circuit_t structure can fill one of two roles. First, a or_circuit_t
* links two connections together: either an edge connection and an OR
* connection, or two OR connections. (When joined to an OR connection, a
* circuit_t affects only cells sent to a particular circID on that
* connection. When joined to an edge connection, a circuit_t affects all
* data.)
* Second, an origin_circuit_t holds the cipher keys and state for sending data
* along a given circuit. At the OP, it has a sequence of ciphers, each
* of which is shared with a single OR along the circuit. Separate
* ciphers are used for data going "forward" (away from the OP) and
* "backward" (towards the OP). At the OR, a circuit has only two stream
* ciphers: one for data going forward, and one for data going backward.
*/
typedef struct circuit_t {
uint32_t magic; /**< For memory and type debugging: must equal
* ORIGIN_CIRCUIT_MAGIC or OR_CIRCUIT_MAGIC. */
/** The channel that is next in this circuit. */
channel_t *n_chan;
/**
* The circuit_id used in the next (forward) hop of this circuit;
* this is unique to n_chan, but this ordered pair is globally
* unique:
*
* (n_chan->global_identifier, n_circ_id)
*/
circid_t n_circ_id;
/**
* Circuit mux associated with n_chan to which this circuit is attached;
* NULL if we have no n_chan.
*/
circuitmux_t *n_mux;
/** Queue of cells waiting to be transmitted on n_chan */
cell_queue_t n_chan_cells;
/**
* The hop to which we want to extend this circuit. Should be NULL if
* the circuit has attached to a channel.
*/
extend_info_t *n_hop;
/** True iff we are waiting for n_chan_cells to become less full before
* allowing p_streams to add any more cells. (Origin circuit only.) */
unsigned int streams_blocked_on_n_chan : 1;
/** True iff we are waiting for p_chan_cells to become less full before
* allowing n_streams to add any more cells. (OR circuit only.) */
unsigned int streams_blocked_on_p_chan : 1;
uint8_t state; /**< Current status of this circuit. */
uint8_t purpose; /**< Why are we creating this circuit? */
/** How many relay data cells can we package (read from edge streams)
* on this circuit before we receive a circuit-level sendme cell asking
* for more? */
int package_window;
/** How many relay data cells will we deliver (write to edge streams)
* on this circuit? When deliver_window gets low, we send some
* circuit-level sendme cells to indicate that we're willing to accept
* more. */
int deliver_window;
/** For storage while n_chan is pending
* (state CIRCUIT_STATE_CHAN_WAIT). When defined, it is always
* length ONIONSKIN_CHALLENGE_LEN. */
char *n_chan_onionskin;
/** When was this circuit created? We keep this timestamp with a higher
* resolution than most so that the circuit-build-time tracking code can
* get millisecond resolution. */
struct timeval timestamp_created;
/** When the circuit was first used, or 0 if the circuit is clean.
*
* XXXX023 Note that some code will artifically adjust this value backward
* in time in order to indicate that a circuit shouldn't be used for new
* streams, but that it can stay alive as long as it has streams on it.
* That's a kludge we should fix.
*
* XXX023 The CBT code uses this field to record when HS-related
* circuits entered certain states. This usage probably won't
* interfere with this field's primary purpose, but we should
* document it more thoroughly to make sure of that.
*/
time_t timestamp_dirty;
uint16_t marked_for_close; /**< Should we close this circuit at the end of
* the main loop? (If true, holds the line number
* where this circuit was marked.) */
const char *marked_for_close_file; /**< For debugging: in which file was this
* circuit marked for close? */
/** Unique ID for measuring tunneled network status requests. */
uint64_t dirreq_id;
struct circuit_t *next; /**< Next circuit in linked list of all circuits. */
/** Next circuit in the doubly-linked ring of circuits waiting to add
* cells to n_conn. NULL if we have no cells pending, or if we're not
* linked to an OR connection. */
struct circuit_t *next_active_on_n_chan;
/** Previous circuit in the doubly-linked ring of circuits waiting to add
* cells to n_conn. NULL if we have no cells pending, or if we're not
* linked to an OR connection. */
struct circuit_t *prev_active_on_n_chan;
} circuit_t;
/** Largest number of relay_early cells that we can send on a given
* circuit. */
#define MAX_RELAY_EARLY_CELLS_PER_CIRCUIT 8
/**
* Describes the circuit building process in simplified terms based
* on the path bias accounting state for a circuit. Created to prevent
* overcounting due to unknown cases of circuit reuse. See Bug #6475.
*/
typedef enum {
/** This circuit is "new". It has not yet completed a first hop
* or been counted by the path bias code. */
PATH_STATE_NEW_CIRC = 0,
/** This circuit has completed a first hop, and has been counted by
* the path bias logic. */
PATH_STATE_DID_FIRST_HOP = 1,
/** This circuit has been completely built, and has been counted as
* successful by the path bias logic. */
PATH_STATE_SUCCEEDED = 2,
} path_state_t;
/** An origin_circuit_t holds data necessary to build and use a circuit.
*/
typedef struct origin_circuit_t {
circuit_t base_;
/** Linked list of AP streams (or EXIT streams if hidden service)
* associated with this circuit. */
edge_connection_t *p_streams;
/** Build state for this circuit. It includes the intended path
* length, the chosen exit router, rendezvous information, etc.
*/
cpath_build_state_t *build_state;
/** The doubly-linked list of crypt_path_t entries, one per hop,
* for this circuit. This includes ciphers for each hop,
* integrity-checking digests for each hop, and package/delivery
* windows for each hop.
*/
crypt_path_t *cpath;
/** Holds all rendezvous data on either client or service side. */
rend_data_t *rend_data;
/** How many more relay_early cells can we send on this circuit, according
* to the specification? */
unsigned int remaining_relay_early_cells : 4;
/** Set if this circuit is insanely old and we already informed the user */
unsigned int is_ancient : 1;
/** Set if this circuit has already been opened. Used to detect
* cannibalized circuits. */
unsigned int has_opened : 1;
/** Kludge to help us prevent the warn in bug #6475 and eventually
* debug why we are not seeing first hops in some cases. */
path_state_t path_state : 2;
/** Set iff this is a hidden-service circuit which has timed out
* according to our current circuit-build timeout, but which has
* been kept around because it might still succeed in connecting to
* its destination, and which is not a fully-connected rendezvous
* circuit.
*
* (We clear this flag for client-side rendezvous circuits when they
* are 'joined' to the other side's rendezvous circuit, so that
* connection_ap_handshake_attach_circuit can put client streams on
* the circuit. We also clear this flag for service-side rendezvous
* circuits when they are 'joined' to a client's rend circ, but only
* for symmetry with the client case. Client-side introduction
* circuits are closed when we get a joined rend circ, and
* service-side introduction circuits never have this flag set.) */
unsigned int hs_circ_has_timed_out : 1;
/** Set iff this is a service-side rendezvous circuit for which a
* new connection attempt has been launched. We consider launching
* a new service-side rend circ to a client when the previous one
* fails; now that we don't necessarily close a service-side rend
* circ when we launch a new one to the same client, this flag keeps
* us from launching two retries for the same failed rend circ. */
unsigned int hs_service_side_rend_circ_has_been_relaunched : 1;
/** What commands were sent over this circuit that decremented the
* RELAY_EARLY counter? This is for debugging task 878. */
uint8_t relay_early_commands[MAX_RELAY_EARLY_CELLS_PER_CIRCUIT];
/** How many RELAY_EARLY cells have been sent over this circuit? This is
* for debugging task 878, too. */
int relay_early_cells_sent;
/** The next stream_id that will be tried when we're attempting to
* construct a new AP stream originating at this circuit. */
streamid_t next_stream_id;
/* The intro key replaces the hidden service's public key if purpose is
* S_ESTABLISH_INTRO or S_INTRO, provided that no unversioned rendezvous
* descriptor is used. */
crypto_pk_t *intro_key;
/** Quasi-global identifier for this circuit; used for control.c */
/* XXXX NM This can get re-used after 2**32 circuits. */
uint32_t global_identifier;
/** True if we have associated one stream to this circuit, thereby setting
* the isolation paramaters for this circuit. Note that this doesn't
* necessarily mean that we've <em>attached</em> any streams to the circuit:
* we may only have marked up this circuit during the launch process.
*/
unsigned int isolation_values_set : 1;
/** True iff any stream has <em>ever</em> been attached to this circuit.
*
* In a better world we could use timestamp_dirty for this, but
* timestamp_dirty is far too overloaded at the moment.
*/
unsigned int isolation_any_streams_attached : 1;
/** A bitfield of ISO_* flags for every isolation field such that this
* circuit has had streams with more than one value for that field
* attached to it. */
uint8_t isolation_flags_mixed;
/** @name Isolation parameters
*
* If any streams have been associated with this circ (isolation_values_set
* == 1), and all streams associated with the circuit have had the same
* value for some field ((isolation_flags_mixed & ISO_FOO) == 0), then these
* elements hold the value for that field.
*
* Note again that "associated" is not the same as "attached": we
* preliminarily associate streams with a circuit while the circuit is being
* launched, so that we can tell whether we need to launch more circuits.
*
* @{
*/
uint8_t client_proto_type;
uint8_t client_proto_socksver;
uint16_t dest_port;
tor_addr_t client_addr;
char *dest_address;
int session_group;
unsigned nym_epoch;
size_t socks_username_len;
uint8_t socks_password_len;
/* Note that the next two values are NOT NUL-terminated; see
socks_username_len and socks_password_len for their lengths. */
char *socks_username;
char *socks_password;
/** Global identifier for the first stream attached here; used by
* ISO_STREAM. */
uint64_t associated_isolated_stream_global_id;
/**@}*/
} origin_circuit_t;
/** An or_circuit_t holds information needed to implement a circuit at an
* OR. */
typedef struct or_circuit_t {
circuit_t base_;
/** Next circuit in the doubly-linked ring of circuits waiting to add
* cells to p_chan. NULL if we have no cells pending, or if we're not
* linked to an OR connection. */
struct circuit_t *next_active_on_p_chan;
/** Previous circuit in the doubly-linked ring of circuits waiting to add
* cells to p_chan. NULL if we have no cells pending, or if we're not
* linked to an OR connection. */
struct circuit_t *prev_active_on_p_chan;
/** The circuit_id used in the previous (backward) hop of this circuit. */
circid_t p_circ_id;
/** Queue of cells waiting to be transmitted on p_conn. */
cell_queue_t p_chan_cells;
/** The channel that is previous in this circuit. */
channel_t *p_chan;
/**
* Circuit mux associated with p_chan to which this circuit is attached;
* NULL if we have no p_chan.
*/
circuitmux_t *p_mux;
/** Linked list of Exit streams associated with this circuit. */
edge_connection_t *n_streams;
/** Linked list of Exit streams associated with this circuit that are
* still being resolved. */
edge_connection_t *resolving_streams;
/** The cipher used by intermediate hops for cells heading toward the
* OP. */
crypto_cipher_t *p_crypto;
/** The cipher used by intermediate hops for cells heading away from
* the OP. */
crypto_cipher_t *n_crypto;
/** The integrity-checking digest used by intermediate hops, for
* cells packaged here and heading towards the OP.
*/
crypto_digest_t *p_digest;
/** The integrity-checking digest used by intermediate hops, for
* cells packaged at the OP and arriving here.
*/
crypto_digest_t *n_digest;
/** Points to spliced circuit if purpose is REND_ESTABLISHED, and circuit
* is not marked for close. */
struct or_circuit_t *rend_splice;
#if REND_COOKIE_LEN >= DIGEST_LEN
#define REND_TOKEN_LEN REND_COOKIE_LEN
#else
#define REND_TOKEN_LEN DIGEST_LEN
#endif
/** A hash of location-hidden service's PK if purpose is INTRO_POINT, or a
* rendezvous cookie if purpose is REND_POINT_WAITING. Filled with zeroes
* otherwise.
* ???? move to a subtype or adjunct structure? Wastes 20 bytes. -NM
*/
char rend_token[REND_TOKEN_LEN];
/* ???? move to a subtype or adjunct structure? Wastes 20 bytes -NM */
char handshake_digest[DIGEST_LEN]; /**< Stores KH for the handshake. */
/** How many more relay_early cells can we send on this circuit, according
* to the specification? */
unsigned int remaining_relay_early_cells : 4;
/** True iff this circuit was made with a CREATE_FAST cell. */
unsigned int is_first_hop : 1;
/** Number of cells that were removed from circuit queue; reset every
* time when writing buffer stats to disk. */
uint32_t processed_cells;
/** Total time in milliseconds that cells spent in both app-ward and
* exit-ward queues of this circuit; reset every time when writing
* buffer stats to disk. */
uint64_t total_cell_waiting_time;
} or_circuit_t;
/** Convert a circuit subtype to a circuit_t. */
#define TO_CIRCUIT(x) (&((x)->base_))
/** Convert a circuit_t* to a pointer to the enclosing or_circuit_t. Assert
* if the cast is impossible. */
static or_circuit_t *TO_OR_CIRCUIT(circuit_t *);
/** Convert a circuit_t* to a pointer to the enclosing origin_circuit_t.
* Assert if the cast is impossible. */
static origin_circuit_t *TO_ORIGIN_CIRCUIT(circuit_t *);
static INLINE or_circuit_t *TO_OR_CIRCUIT(circuit_t *x)
{
tor_assert(x->magic == OR_CIRCUIT_MAGIC);
return DOWNCAST(or_circuit_t, x);
}
static INLINE origin_circuit_t *TO_ORIGIN_CIRCUIT(circuit_t *x)
{
tor_assert(x->magic == ORIGIN_CIRCUIT_MAGIC);
return DOWNCAST(origin_circuit_t, x);
}
/** Bitfield type: things that we're willing to use invalid routers for. */
typedef enum invalid_router_usage_t {
ALLOW_INVALID_ENTRY =1,
ALLOW_INVALID_EXIT =2,
ALLOW_INVALID_MIDDLE =4,
ALLOW_INVALID_RENDEZVOUS =8,
ALLOW_INVALID_INTRODUCTION=16,
} invalid_router_usage_t;
/* limits for TCP send and recv buffer size used for constrained sockets */
#define MIN_CONSTRAINED_TCP_BUFFER 2048
#define MAX_CONSTRAINED_TCP_BUFFER 262144 /* 256k */
/** @name Isolation flags
Ways to isolate client streams
@{
*/
/** Isolate based on destination port */
#define ISO_DESTPORT (1u<<0)
/** Isolate based on destination address */
#define ISO_DESTADDR (1u<<1)
/** Isolate based on SOCKS authentication */
#define ISO_SOCKSAUTH (1u<<2)
/** Isolate based on client protocol choice */
#define ISO_CLIENTPROTO (1u<<3)
/** Isolate based on client address */
#define ISO_CLIENTADDR (1u<<4)
/** Isolate based on session group (always on). */
#define ISO_SESSIONGRP (1u<<5)
/** Isolate based on newnym epoch (always on). */
#define ISO_NYM_EPOCH (1u<<6)
/** Isolate all streams (Internal only). */
#define ISO_STREAM (1u<<7)
/**@}*/
/** Default isolation level for ports. */
#define ISO_DEFAULT (ISO_CLIENTADDR|ISO_SOCKSAUTH|ISO_SESSIONGRP|ISO_NYM_EPOCH)
/** Indicates that we haven't yet set a session group on a port_cfg_t. */
#define SESSION_GROUP_UNSET -1
/** Session group reserved for directory connections */
#define SESSION_GROUP_DIRCONN -2
/** Session group reserved for resolve requests launched by a controller */
#define SESSION_GROUP_CONTROL_RESOLVE -3
/** First automatically allocated session group number */
#define SESSION_GROUP_FIRST_AUTO -4
/** Configuration for a single port that we're listening on. */
typedef struct port_cfg_t {
tor_addr_t addr; /**< The actual IP to listen on, if !is_unix_addr. */
int port; /**< The configured port, or CFG_AUTO_PORT to tell Tor to pick its
* own port. */
uint8_t type; /**< One of CONN_TYPE_*_LISTENER */
unsigned is_unix_addr : 1; /**< True iff this is an AF_UNIX address. */
/* Client port types (socks, dns, trans, natd) only: */
uint8_t isolation_flags; /**< Zero or more isolation flags */
int session_group; /**< A session group, or -1 if this port is not in a
* session group. */
/* Server port types (or, dir) only: */
unsigned int no_advertise : 1;
unsigned int no_listen : 1;
unsigned int all_addrs : 1;
unsigned int bind_ipv4_only : 1;
unsigned int bind_ipv6_only : 1;
unsigned int ipv4_traffic : 1;
unsigned int ipv6_traffic : 1;
unsigned int prefer_ipv6 : 1;
/* Unix sockets only: */
/** Path for an AF_UNIX address */
char unix_addr[FLEXIBLE_ARRAY_MEMBER];
} port_cfg_t;
/** Ordinary configuration line. */
#define CONFIG_LINE_NORMAL 0
/** Appends to previous configuration for the same option, even if we
* would ordinary replace it. */
#define CONFIG_LINE_APPEND 1
/* Removes all previous configuration for an option. */
#define CONFIG_LINE_CLEAR 2
/** A linked list of lines in a config file. */
typedef struct config_line_t {
char *key;
char *value;
struct config_line_t *next;
/** What special treatment (if any) does this line require? */
unsigned int command:2;
/** If true, subsequent assignments to this linelist should replace
* it, not extend it. Set only on the first item in a linelist in an
* or_options_t. */
unsigned int fragile:1;
} config_line_t;
typedef struct routerset_t routerset_t;
/** A magic value for the (Socks|OR|...)Port options below, telling Tor
* to pick its own port. */
#define CFG_AUTO_PORT 0xc4005e
/** Configuration options for a Tor process. */
typedef struct {
uint32_t magic_;
/** What should the tor process actually do? */
enum {
CMD_RUN_TOR=0, CMD_LIST_FINGERPRINT, CMD_HASH_PASSWORD,
CMD_VERIFY_CONFIG, CMD_RUN_UNITTESTS
} command;
const char *command_arg; /**< Argument for command-line option. */
config_line_t *Logs; /**< New-style list of configuration lines
* for logs */
int LogTimeGranularity; /**< Log resolution in milliseconds. */
int LogMessageDomains; /**< Boolean: Should we log the domain(s) in which
* each log message occurs? */
char *DebugLogFile; /**< Where to send verbose log messages. */
char *DataDirectory; /**< OR only: where to store long-term data. */
char *Nickname; /**< OR only: nickname of this onion router. */
char *Address; /**< OR only: configured address for this onion router. */
char *PidFile; /**< Where to store PID of Tor process. */
int DynamicDHGroups; /**< Dynamic generation of prime moduli for use in DH.*/
routerset_t *ExitNodes; /**< Structure containing nicknames, digests,
* country codes and IP address patterns of ORs to
* consider as exits. */
routerset_t *EntryNodes;/**< Structure containing nicknames, digests,
* country codes and IP address patterns of ORs to
* consider as entry points. */
int StrictNodes; /**< Boolean: When none of our EntryNodes or ExitNodes
* are up, or we need to access a node in ExcludeNodes,
* do we just fail instead? */
routerset_t *ExcludeNodes;/**< Structure containing nicknames, digests,
* country codes and IP address patterns of ORs
* not to use in circuits. But see StrictNodes
* above. */
routerset_t *ExcludeExitNodes;/**< Structure containing nicknames, digests,
* country codes and IP address patterns of
* ORs not to consider as exits. */
/** Union of ExcludeNodes and ExcludeExitNodes */
routerset_t *ExcludeExitNodesUnion_;
int DisableAllSwap; /**< Boolean: Attempt to call mlockall() on our
* process for all current and future memory. */
/** List of "entry", "middle", "exit", "introduction", "rendezvous". */
smartlist_t *AllowInvalidNodes;
/** Bitmask; derived from AllowInvalidNodes. */
invalid_router_usage_t AllowInvalid_;
config_line_t *ExitPolicy; /**< Lists of exit policy components. */
int ExitPolicyRejectPrivate; /**< Should we not exit to local addresses? */
config_line_t *SocksPolicy; /**< Lists of socks policy components */
config_line_t *DirPolicy; /**< Lists of dir policy components */
/** Addresses to bind for listening for SOCKS connections. */
config_line_t *SocksListenAddress;
/** Addresses to bind for listening for transparent pf/netfilter
* connections. */
config_line_t *TransListenAddress;
/** Addresses to bind for listening for transparent natd connections */
config_line_t *NATDListenAddress;
/** Addresses to bind for listening for SOCKS connections. */
config_line_t *DNSListenAddress;
/** Addresses to bind for listening for OR connections. */
config_line_t *ORListenAddress;
/** Addresses to bind for listening for directory connections. */
config_line_t *DirListenAddress;
/** Addresses to bind for listening for control connections. */
config_line_t *ControlListenAddress;
/** Local address to bind outbound sockets */
config_line_t *OutboundBindAddress;
/** IPv4 address derived from OutboundBindAddress. */
tor_addr_t OutboundBindAddressIPv4_;
/** IPv6 address derived from OutboundBindAddress. */
tor_addr_t OutboundBindAddressIPv6_;
/** Directory server only: which versions of
* Tor should we tell users to run? */
config_line_t *RecommendedVersions;
config_line_t *RecommendedClientVersions;
config_line_t *RecommendedServerVersions;
/** Whether dirservers allow router descriptors with private IPs. */
int DirAllowPrivateAddresses;
/** Whether routers accept EXTEND cells to routers with private IPs. */
int ExtendAllowPrivateAddresses;
char *User; /**< Name of user to run Tor as. */
char *Group; /**< Name of group to run Tor as. */
config_line_t *ORPort_lines; /**< Ports to listen on for OR connections. */
/** Ports to listen on for SOCKS connections. */
config_line_t *SocksPort_lines;
/** Ports to listen on for transparent pf/netfilter connections. */
config_line_t *TransPort_lines;
config_line_t *NATDPort_lines; /**< Ports to listen on for transparent natd
* connections. */
config_line_t *ControlPort_lines; /**< Ports to listen on for control
* connections. */
config_line_t *ControlSocket; /**< List of Unix Domain Sockets to listen on
* for control connections. */
int ControlSocketsGroupWritable; /**< Boolean: Are control sockets g+rw? */
/** Ports to listen on for directory connections. */
config_line_t *DirPort_lines;
config_line_t *DNSPort_lines; /**< Ports to listen on for DNS requests. */
/** @name port booleans
*
* Derived booleans: True iff there is a non-listener port on an AF_INET or
* AF_INET6 address of the given type configured in one of the _lines
* options above.
*
* @{
*/
unsigned int ORPort_set : 1;
unsigned int SocksPort_set : 1;
unsigned int TransPort_set : 1;
unsigned int NATDPort_set : 1;
unsigned int ControlPort_set : 1;
unsigned int DirPort_set : 1;
unsigned int DNSPort_set : 1;
/**@}*/
int AssumeReachable; /**< Whether to publish our descriptor regardless. */
int AuthoritativeDir; /**< Boolean: is this an authoritative directory? */
int V1AuthoritativeDir; /**< Boolean: is this an authoritative directory
* for version 1 directories? */
int V2AuthoritativeDir; /**< Boolean: is this an authoritative directory
* for version 2 directories? */
int V3AuthoritativeDir; /**< Boolean: is this an authoritative directory
* for version 3 directories? */
int HSAuthoritativeDir; /**< Boolean: does this an authoritative directory
* handle hidden service requests? */
int NamingAuthoritativeDir; /**< Boolean: is this an authoritative directory
* that's willing to bind names? */
int VersioningAuthoritativeDir; /**< Boolean: is this an authoritative
* directory that's willing to recommend
* versions? */
int BridgeAuthoritativeDir; /**< Boolean: is this an authoritative directory
* that aggregates bridge descriptors? */
/** If set on a bridge authority, it will answer requests on its dirport
* for bridge statuses -- but only if the requests use this password. */
char *BridgePassword;
/** If BridgePassword is set, this is a SHA256 digest of the basic http
* authenticator for it. Used so we can do a time-independent comparison. */
char *BridgePassword_AuthDigest_;
int UseBridges; /**< Boolean: should we start all circuits with a bridge? */
config_line_t *Bridges; /**< List of bootstrap bridge addresses. */
config_line_t *ClientTransportPlugin; /**< List of client
transport plugins. */
config_line_t *ServerTransportPlugin; /**< List of client
transport plugins. */
/** List of TCP/IP addresses that transports should listen at. */
config_line_t *ServerTransportListenAddr;
int BridgeRelay; /**< Boolean: are we acting as a bridge relay? We make
* this explicit so we can change how we behave in the
* future. */
/** Boolean: if we know the bridge's digest, should we get new
* descriptors from the bridge authorities or from the bridge itself? */
int UpdateBridgesFromAuthority;
int AvoidDiskWrites; /**< Boolean: should we never cache things to disk?
* Not used yet. */
int ClientOnly; /**< Boolean: should we never evolve into a server role? */
/** To what authority types do we publish our descriptor? Choices are
* "v1", "v2", "v3", "bridge", or "". */
smartlist_t *PublishServerDescriptor;
/** A bitfield of authority types, derived from PublishServerDescriptor. */
dirinfo_type_t PublishServerDescriptor_;
/** Boolean: do we publish hidden service descriptors to the HS auths? */
int PublishHidServDescriptors;
int FetchServerDescriptors; /**< Do we fetch server descriptors as normal? */
int FetchHidServDescriptors; /**< and hidden service descriptors? */
int FetchV2Networkstatus; /**< Do we fetch v2 networkstatus documents when
* we don't need to? */
int HidServDirectoryV2; /**< Do we participate in the HS DHT? */
int VoteOnHidServDirectoriesV2; /**< As a directory authority, vote on
* assignment of the HSDir flag? */
int MinUptimeHidServDirectoryV2; /**< As directory authority, accept hidden
* service directories after what time? */
int FetchUselessDescriptors; /**< Do we fetch non-running descriptors too? */
int AllDirActionsPrivate; /**< Should every directory action be sent
* through a Tor circuit? */
/** Run in 'tor2web mode'? (I.e. only make client connections to hidden
* services, and use a single hop for all hidden-service-related
* circuits.) */
int Tor2webMode;
/** Close hidden service client circuits immediately when they reach
* the normal circuit-build timeout, even if they have already sent
* an INTRODUCE1 cell on its way to the service. */
int CloseHSClientCircuitsImmediatelyOnTimeout;
/** Close hidden-service-side rendezvous circuits immediately when
* they reach the normal circuit-build timeout. */
int CloseHSServiceRendCircuitsImmediatelyOnTimeout;
int ConnLimit; /**< Demanded minimum number of simultaneous connections. */
int ConnLimit_; /**< Maximum allowed number of simultaneous connections. */
int RunAsDaemon; /**< If true, run in the background. (Unix only) */
int FascistFirewall; /**< Whether to prefer ORs reachable on open ports. */
smartlist_t *FirewallPorts; /**< Which ports our firewall allows
* (strings). */
config_line_t *ReachableAddresses; /**< IP:ports our firewall allows. */
config_line_t *ReachableORAddresses; /**< IP:ports for OR conns. */
config_line_t *ReachableDirAddresses; /**< IP:ports for Dir conns. */
int ConstrainedSockets; /**< Shrink xmit and recv socket buffers. */
uint64_t ConstrainedSockSize; /**< Size of constrained buffers. */
/** Whether we should drop exit streams from Tors that we don't know are
* relays. One of "0" (never refuse), "1" (always refuse), or "-1" (do
* what the consensus says, defaulting to 'refuse' if the consensus says
* nothing). */
int RefuseUnknownExits;
/** Application ports that require all nodes in circ to have sufficient
* uptime. */
smartlist_t *LongLivedPorts;
/** Application ports that are likely to be unencrypted and
* unauthenticated; we reject requests for them to prevent the
* user from screwing up and leaking plaintext secrets to an
* observer somewhere on the Internet. */
smartlist_t *RejectPlaintextPorts;
/** Related to RejectPlaintextPorts above, except this config option
* controls whether we warn (in the log and via a controller status
* event) every time a risky connection is attempted. */
smartlist_t *WarnPlaintextPorts;
/** Should we try to reuse the same exit node for a given host */
smartlist_t *TrackHostExits;
int TrackHostExitsExpire; /**< Number of seconds until we expire an
* addressmap */
config_line_t *AddressMap; /**< List of address map directives. */
int AutomapHostsOnResolve; /**< If true, when we get a resolve request for a
* hostname ending with one of the suffixes in
* <b>AutomapHostsSuffixes</b>, map it to a
* virtual address. */
smartlist_t *AutomapHostsSuffixes; /**< List of suffixes for
* <b>AutomapHostsOnResolve</b>. */
int RendPostPeriod; /**< How often do we post each rendezvous service
* descriptor? Remember to publish them independently. */
int KeepalivePeriod; /**< How often do we send padding cells to keep
* connections alive? */
int SocksTimeout; /**< How long do we let a socks connection wait
* unattached before we fail it? */
int LearnCircuitBuildTimeout; /**< If non-zero, we attempt to learn a value
* for CircuitBuildTimeout based on timeout
* history */
int CircuitBuildTimeout; /**< Cull non-open circuits that were born at
* least this many seconds ago. Used until
* adaptive algorithm learns a new value. */
int CircuitIdleTimeout; /**< Cull open clean circuits that were born
* at least this many seconds ago. */
int CircuitStreamTimeout; /**< If non-zero, detach streams from circuits
* and try a new circuit if the stream has been
* waiting for this many seconds. If zero, use
* our default internal timeout schedule. */
int MaxOnionsPending; /**< How many circuit CREATE requests do we allow
* to wait simultaneously before we start dropping
* them? */
int NewCircuitPeriod; /**< How long do we use a circuit before building
* a new one? */
int MaxCircuitDirtiness; /**< Never use circs that were first used more than
this interval ago. */
uint64_t BandwidthRate; /**< How much bandwidth, on average, are we willing
* to use in a second? */
uint64_t BandwidthBurst; /**< How much bandwidth, at maximum, are we willing
* to use in a second? */
uint64_t MaxAdvertisedBandwidth; /**< How much bandwidth are we willing to
* tell people we have? */
uint64_t RelayBandwidthRate; /**< How much bandwidth, on average, are we
* willing to use for all relayed conns? */
uint64_t RelayBandwidthBurst; /**< How much bandwidth, at maximum, will we
* use in a second for all relayed conns? */
uint64_t PerConnBWRate; /**< Long-term bw on a single TLS conn, if set. */
uint64_t PerConnBWBurst; /**< Allowed burst on a single TLS conn, if set. */
int NumCPUs; /**< How many CPUs should we try to use? */
//int RunTesting; /**< If true, create testing circuits to measure how well the
// * other ORs are running. */
config_line_t *RendConfigLines; /**< List of configuration lines
* for rendezvous services. */
config_line_t *HidServAuth; /**< List of configuration lines for client-side
* authorizations for hidden services */
char *ContactInfo; /**< Contact info to be published in the directory. */
int HeartbeatPeriod; /**< Log heartbeat messages after this many seconds
* have passed. */
char *HTTPProxy; /**< hostname[:port] to use as http proxy, if any. */
tor_addr_t HTTPProxyAddr; /**< Parsed IPv4 addr for http proxy, if any. */
uint16_t HTTPProxyPort; /**< Parsed port for http proxy, if any. */
char *HTTPProxyAuthenticator; /**< username:password string, if any. */
char *HTTPSProxy; /**< hostname[:port] to use as https proxy, if any. */
tor_addr_t HTTPSProxyAddr; /**< Parsed addr for https proxy, if any. */
uint16_t HTTPSProxyPort; /**< Parsed port for https proxy, if any. */
char *HTTPSProxyAuthenticator; /**< username:password string, if any. */
char *Socks4Proxy; /**< hostname:port to use as a SOCKS4 proxy, if any. */
tor_addr_t Socks4ProxyAddr; /**< Derived from Socks4Proxy. */
uint16_t Socks4ProxyPort; /**< Derived from Socks4Proxy. */
char *Socks5Proxy; /**< hostname:port to use as a SOCKS5 proxy, if any. */
tor_addr_t Socks5ProxyAddr; /**< Derived from Sock5Proxy. */
uint16_t Socks5ProxyPort; /**< Derived from Socks5Proxy. */
char *Socks5ProxyUsername; /**< Username for SOCKS5 authentication, if any */
char *Socks5ProxyPassword; /**< Password for SOCKS5 authentication, if any */
/** List of configuration lines for replacement directory authorities.
* If you just want to replace one class of authority at a time,
* use the "Alternate*Authority" options below instead. */
config_line_t *DirAuthorities;
/** List of fallback directory servers */
config_line_t *FallbackDir;
/** Weight to apply to all directory authority rates if considering them
* along with fallbackdirs */
double DirAuthorityFallbackRate;
/** If set, use these main (currently v3) directory authorities and
* not the default ones. */
config_line_t *AlternateDirAuthority;
/** If set, use these bridge authorities and not the default one. */
config_line_t *AlternateBridgeAuthority;
/** If set, use these HS authorities and not the default ones. */
config_line_t *AlternateHSAuthority;
char *MyFamily; /**< Declared family for this OR. */
config_line_t *NodeFamilies; /**< List of config lines for
* node families */
smartlist_t *NodeFamilySets; /**< List of parsed NodeFamilies values. */
config_line_t *AuthDirBadDir; /**< Address policy for descriptors to
* mark as bad dir mirrors. */
config_line_t *AuthDirBadExit; /**< Address policy for descriptors to
* mark as bad exits. */
config_line_t *AuthDirReject; /**< Address policy for descriptors to
* reject. */
config_line_t *AuthDirInvalid; /**< Address policy for descriptors to
* never mark as valid. */
/** @name AuthDir...CC
*
* Lists of country codes to mark as BadDir, BadExit, or Invalid, or to
* reject entirely.
*
* @{
*/
smartlist_t *AuthDirBadDirCCs;
smartlist_t *AuthDirBadExitCCs;
smartlist_t *AuthDirInvalidCCs;
smartlist_t *AuthDirRejectCCs;
/**@}*/
int AuthDirListBadDirs; /**< True iff we should list bad dirs,
* and vote for all other dir mirrors as good. */
int AuthDirListBadExits; /**< True iff we should list bad exits,
* and vote for all other exits as good. */
int AuthDirRejectUnlisted; /**< Boolean: do we reject all routers that
* aren't named in our fingerprint file? */
int AuthDirMaxServersPerAddr; /**< Do not permit more than this
* number of servers per IP address. */
int AuthDirMaxServersPerAuthAddr; /**< Do not permit more than this
* number of servers per IP address shared
* with an authority. */
int AuthDirHasIPv6Connectivity; /**< Boolean: are we on IPv6? */
/** If non-zero, always vote the Fast flag for any relay advertising
* this amount of capacity or more. */
uint64_t AuthDirFastGuarantee;
/** If non-zero, this advertised capacity or more is always sufficient
* to satisfy the bandwidth requirement for the Guard flag. */
uint64_t AuthDirGuardBWGuarantee;
char *AccountingStart; /**< How long is the accounting interval, and when
* does it start? */
uint64_t AccountingMax; /**< How many bytes do we allow per accounting
* interval before hibernation? 0 for "never
* hibernate." */
/** Base64-encoded hash of accepted passwords for the control system. */
config_line_t *HashedControlPassword;
/** As HashedControlPassword, but not saved. */
config_line_t *HashedControlSessionPassword;
int CookieAuthentication; /**< Boolean: do we enable cookie-based auth for
* the control system? */
char *CookieAuthFile; /**< Location of a cookie authentication file. */
int CookieAuthFileGroupReadable; /**< Boolean: Is the CookieAuthFile g+r? */
int LeaveStreamsUnattached; /**< Boolean: Does Tor attach new streams to
* circuits itself (0), or does it expect a controller
* to cope? (1) */
int DisablePredictedCircuits; /**< Boolean: does Tor preemptively
* make circuits in the background (0),
* or not (1)? */
/** Process specifier for a controller that ‘owns’ this Tor
* instance. Tor will terminate if its owning controller does. */
char *OwningControllerProcess;
int ShutdownWaitLength; /**< When we get a SIGINT and we're a server, how
* long do we wait before exiting? */
char *SafeLogging; /**< Contains "relay", "1", "0" (meaning no scrubbing). */
/* Derived from SafeLogging */
enum {
SAFELOG_SCRUB_ALL, SAFELOG_SCRUB_RELAY, SAFELOG_SCRUB_NONE
} SafeLogging_;
int SafeSocks; /**< Boolean: should we outright refuse application
* connections that use socks4 or socks5-with-local-dns? */
#define LOG_PROTOCOL_WARN (get_options()->ProtocolWarnings ? \
LOG_WARN : LOG_INFO)
int ProtocolWarnings; /**< Boolean: when other parties screw up the Tor
* protocol, is it a warn or an info in our logs? */
int TestSocks; /**< Boolean: when we get a socks connection, do we loudly
* log whether it was DNS-leaking or not? */
int HardwareAccel; /**< Boolean: Should we enable OpenSSL hardware
* acceleration where available? */
/** Token Bucket Refill resolution in milliseconds. */
int TokenBucketRefillInterval;
char *AccelName; /**< Optional hardware acceleration engine name. */
char *AccelDir; /**< Optional hardware acceleration engine search dir. */
int UseEntryGuards; /**< Boolean: Do we try to enter from a smallish number
* of fixed nodes? */
int NumEntryGuards; /**< How many entry guards do we try to establish? */
int RephistTrackTime; /**< How many seconds do we keep rephist info? */
int FastFirstHopPK; /**< If Tor believes it is safe, should we save a third
* of our PK time by sending CREATE_FAST cells? */
/** Should we always fetch our dir info on the mirror schedule (which
* means directly from the authorities) no matter our other config? */
int FetchDirInfoEarly;
/** Should we fetch our dir info at the start of the consensus period? */
int FetchDirInfoExtraEarly;
char *VirtualAddrNetwork; /**< Address and mask to hand out for virtual
* MAPADDRESS requests. */
int ServerDNSSearchDomains; /**< Boolean: If set, we don't force exit
* addresses to be FQDNs, but rather search for them in
* the local domains. */
int ServerDNSDetectHijacking; /**< Boolean: If true, check for DNS failure
* hijacking. */
int ServerDNSRandomizeCase; /**< Boolean: Use the 0x20-hack to prevent
* DNS poisoning attacks. */
char *ServerDNSResolvConfFile; /**< If provided, we configure our internal
* resolver from the file here rather than from
* /etc/resolv.conf (Unix) or the registry (Windows). */
char *DirPortFrontPage; /**< This is a full path to a file with an html
disclaimer. This allows a server administrator to show
that they're running Tor and anyone visiting their server
will know this without any specialized knowledge. */
int DisableDebuggerAttachment; /**< Currently Linux only specific attempt to
disable ptrace; needs BSD testing. */
/** Boolean: if set, we start even if our resolv.conf file is missing
* or broken. */
int ServerDNSAllowBrokenConfig;
/** Boolean: if set, then even connections to private addresses will get
* rate-limited. */
int CountPrivateBandwidth;
smartlist_t *ServerDNSTestAddresses; /**< A list of addresses that definitely
* should be resolvable. Used for
* testing our DNS server. */
int EnforceDistinctSubnets; /**< If true, don't allow multiple routers in the
* same network zone in the same circuit. */
int TunnelDirConns; /**< If true, use BEGIN_DIR rather than BEGIN when
* possible. */
int PreferTunneledDirConns; /**< If true, avoid dirservers that don't
* support BEGIN_DIR, when possible. */
int PortForwarding; /**< If true, use NAT-PMP or UPnP to automatically
* forward the DirPort and ORPort on the NAT device */
char *PortForwardingHelper; /** < Filename or full path of the port
forwarding helper executable */
int AllowNonRFC953Hostnames; /**< If true, we allow connections to hostnames
* with weird characters. */
/** If true, we try resolving hostnames with weird characters. */
int ServerDNSAllowNonRFC953Hostnames;
/** If true, we try to download extra-info documents (and we serve them,
* if we are a cache). For authorities, this is always true. */
int DownloadExtraInfo;
/** If true, and we are acting as a relay, allow exit circuits even when
* we are the first hop of a circuit. */
int AllowSingleHopExits;
/** If true, don't allow relays with AllowSingleHopExits=1 to be used in
* circuits that we build. */
int ExcludeSingleHopRelays;
/** If true, and the controller tells us to use a one-hop circuit, and the
* exit allows it, we use it. */
int AllowSingleHopCircuits;
/** If true, we convert "www.google.com.foo.exit" addresses on the
* socks/trans/natd ports into "www.google.com" addresses that
* exit from the node "foo". Disabled by default since attacking
* websites and exit relays can use it to manipulate your path
* selection. */
int AllowDotExit;
/** If true, we will warn if a user gives us only an IP address
* instead of a hostname. */
int WarnUnsafeSocks;
/** If true, the user wants us to collect statistics on clients
* requesting network statuses from us as directory. */
int DirReqStatistics;
/** If true, the user wants us to collect statistics on port usage. */
int ExitPortStatistics;
/** If true, the user wants us to collect connection statistics. */
int ConnDirectionStatistics;
/** If true, the user wants us to collect cell statistics. */
int CellStatistics;
/** If true, the user wants us to collect statistics as entry node. */
int EntryStatistics;
/** If true, include statistics file contents in extra-info documents. */
int ExtraInfoStatistics;
/** If true, do not believe anybody who tells us that a domain resolves
* to an internal address, or that an internal address has a PTR mapping.
* Helps avoid some cross-site attacks. */
int ClientDNSRejectInternalAddresses;
/** If true, do not accept any requests to connect to internal addresses
* over randomly chosen exits. */
int ClientRejectInternalAddresses;
/** If true, clients may connect over IPv6. XXX we don't really
enforce this -- clients _may_ set up outgoing IPv6 connections
even when this option is not set. */
int ClientUseIPv6;
/** If true, prefer an IPv6 OR port over an IPv4 one. */
int ClientPreferIPv6ORPort;
/** The length of time that we think a consensus should be fresh. */
int V3AuthVotingInterval;
/** The length of time we think it will take to distribute votes. */
int V3AuthVoteDelay;
/** The length of time we think it will take to distribute signatures. */
int V3AuthDistDelay;
/** The number of intervals we think a consensus should be valid. */
int V3AuthNIntervalsValid;
/** Should advertise and sign consensuses with a legacy key, for key
* migration purposes? */
int V3AuthUseLegacyKey;
/** Location of bandwidth measurement file */
char *V3BandwidthsFile;
/** Authority only: key=value pairs that we add to our networkstatus
* consensus vote on the 'params' line. */
char *ConsensusParams;
/** The length of time that we think an initial consensus should be fresh.
* Only altered on testing networks. */
int TestingV3AuthInitialVotingInterval;
/** The length of time we think it will take to distribute initial votes.
* Only altered on testing networks. */
int TestingV3AuthInitialVoteDelay;
/** The length of time we think it will take to distribute initial
* signatures. Only altered on testing networks.*/
int TestingV3AuthInitialDistDelay;
/** If an authority has been around for less than this amount of time, it
* does not believe its reachability information is accurate. Only
* altered on testing networks. */
int TestingAuthDirTimeToLearnReachability;
/** Clients don't download any descriptor this recent, since it will
* probably not have propagated to enough caches. Only altered on testing
* networks. */
int TestingEstimatedDescriptorPropagationTime;
/** If true, we take part in a testing network. Change the defaults of a
* couple of other configuration options and allow to change the values
* of certain configuration options. */
int TestingTorNetwork;
/** File to check for a consensus networkstatus, if we don't have one
* cached. */
char *FallbackNetworkstatusFile;
/** If true, and we have GeoIP data, and we're a bridge, keep a per-country
* count of how many client addresses have contacted us so that we can help
* the bridge authority guess which countries have blocked access to us. */
int BridgeRecordUsageByCountry;
/** Optionally, IPv4 and IPv6 GeoIP data. */
char *GeoIPFile;
char *GeoIPv6File;
/** If true, SIGHUP should reload the torrc. Sometimes controllers want
* to make this false. */
int ReloadTorrcOnSIGHUP;
/* The main parameter for picking circuits within a connection.
*
* If this value is positive, when picking a cell to relay on a connection,
* we always relay from the circuit whose weighted cell count is lowest.
* Cells are weighted exponentially such that if one cell is sent
* 'CircuitPriorityHalflife' seconds before another, it counts for half as
* much.
*
* If this value is zero, we're disabling the cell-EWMA algorithm.
*
* If this value is negative, we're using the default approach
* according to either Tor or a parameter set in the consensus.
*/
double CircuitPriorityHalflife;
/** If true, do not enable IOCP on windows with bufferevents, even if
* we think we could. */
int DisableIOCP;
/** For testing only: will go away eventually. */
int UseFilteringSSLBufferevents;
/** Set to true if the TestingTorNetwork configuration option is set.
* This is used so that options_validate() has a chance to realize that
* the defaults have changed. */
int UsingTestNetworkDefaults_;
/** If 1, we try to use microdescriptors to build circuits. If 0, we don't.
* If -1, Tor decides. */
int UseMicrodescriptors;
/** File where we should write the ControlPort. */
char *ControlPortWriteToFile;
/** Should that file be group-readable? */
int ControlPortFileGroupReadable;
#define MAX_MAX_CLIENT_CIRCUITS_PENDING 1024
/** Maximum number of non-open general-purpose origin circuits to allow at
* once. */
int MaxClientCircuitsPending;
/** If 1, we always send optimistic data when it's supported. If 0, we
* never use it. If -1, we do what the consensus says. */
int OptimisticData;
/** If 1, and we are using IOCP, we set the kernel socket SNDBUF and RCVBUF
* to 0 to try to save kernel memory and avoid the dread "Out of buffers"
* issue. */
int UserspaceIOCPBuffers;
/** If 1, we accept and launch no external network connections, except on
* control ports. */
int DisableNetwork;
/**
* Parameters for path-bias detection.
* @{
*/
int PathBiasCircThreshold;
double PathBiasNoticeRate;
double PathBiasDisableRate;
int PathBiasScaleThreshold;
int PathBiasScaleFactor;
/** @} */
int IPv6Exit; /**< Do we support exiting to IPv6 addresses? */
} or_options_t;
/** Persistent state for an onion router, as saved to disk. */
typedef struct {
uint32_t magic_;
/** The time at which we next plan to write the state to the disk. Equal to
* TIME_MAX if there are no savable changes, 0 if there are changes that
* should be saved right away. */
time_t next_write;
/** When was the state last written to disk? */
time_t LastWritten;
/** Fields for accounting bandwidth use. */
time_t AccountingIntervalStart;
uint64_t AccountingBytesReadInInterval;
uint64_t AccountingBytesWrittenInInterval;
int AccountingSecondsActive;
int AccountingSecondsToReachSoftLimit;
time_t AccountingSoftLimitHitAt;
uint64_t AccountingBytesAtSoftLimit;
uint64_t AccountingExpectedUsage;
/** A list of Entry Guard-related configuration lines. */
config_line_t *EntryGuards;
config_line_t *TransportProxies;
/** These fields hold information on the history of bandwidth usage for
* servers. The "Ends" fields hold the time when we last updated the
* bandwidth usage. The "Interval" fields hold the granularity, in seconds,
* of the entries of Values. The "Values" lists hold decimal string
* representations of the number of bytes read or written in each
* interval. The "Maxima" list holds decimal strings describing the highest
* rate achieved during the interval.
*/
time_t BWHistoryReadEnds;
int BWHistoryReadInterval;
smartlist_t *BWHistoryReadValues;
smartlist_t *BWHistoryReadMaxima;
time_t BWHistoryWriteEnds;
int BWHistoryWriteInterval;
smartlist_t *BWHistoryWriteValues;
smartlist_t *BWHistoryWriteMaxima;
time_t BWHistoryDirReadEnds;
int BWHistoryDirReadInterval;
smartlist_t *BWHistoryDirReadValues;
smartlist_t *BWHistoryDirReadMaxima;
time_t BWHistoryDirWriteEnds;
int BWHistoryDirWriteInterval;
smartlist_t *BWHistoryDirWriteValues;
smartlist_t *BWHistoryDirWriteMaxima;
/** Build time histogram */
config_line_t * BuildtimeHistogram;
unsigned int TotalBuildTimes;
unsigned int CircuitBuildAbandonedCount;
/** What version of Tor wrote this state file? */
char *TorVersion;
/** Holds any unrecognized values we found in the state file, in the order
* in which we found them. */
config_line_t *ExtraLines;
/** When did we last rotate our onion key? "0" for 'no idea'. */
time_t LastRotatedOnionKey;
} or_state_t;
/** Change the next_write time of <b>state</b> to <b>when</b>, unless the
* state is already scheduled to be written to disk earlier than <b>when</b>.
*/
static INLINE void or_state_mark_dirty(or_state_t *state, time_t when)
{
if (state->next_write > when)
state->next_write = when;
}
#define MAX_SOCKS_REPLY_LEN 1024
#define MAX_SOCKS_ADDR_LEN 256
#define SOCKS_NO_AUTH 0x00
#define SOCKS_USER_PASS 0x02
/** Please open a TCP connection to this addr:port. */
#define SOCKS_COMMAND_CONNECT 0x01
/** Please turn this FQDN into an IP address, privately. */
#define SOCKS_COMMAND_RESOLVE 0xF0
/** Please turn this IP address into an FQDN, privately. */
#define SOCKS_COMMAND_RESOLVE_PTR 0xF1
#define SOCKS_COMMAND_IS_CONNECT(c) ((c)==SOCKS_COMMAND_CONNECT)
#define SOCKS_COMMAND_IS_RESOLVE(c) ((c)==SOCKS_COMMAND_RESOLVE || \
(c)==SOCKS_COMMAND_RESOLVE_PTR)
/** State of a SOCKS request from a user to an OP. Also used to encode other
* information for non-socks user request (such as those on TransPort and
* DNSPort) */
struct socks_request_t {
/** Which version of SOCKS did the client use? One of "0, 4, 5" -- where
* 0 means that no socks handshake ever took place, and this is just a
* stub connection (e.g. see connection_ap_make_link()). */
uint8_t socks_version;
/** If using socks5 authentication, which authentication type did we
* negotiate? currently we support 0 (no authentication) and 2
* (username/password). */
uint8_t auth_type;
/** What is this stream's goal? One of the SOCKS_COMMAND_* values */
uint8_t command;
/** Which kind of listener created this stream? */
uint8_t listener_type;
size_t replylen; /**< Length of <b>reply</b>. */
uint8_t reply[MAX_SOCKS_REPLY_LEN]; /**< Write an entry into this string if
* we want to specify our own socks reply,
* rather than using the default socks4 or
* socks5 socks reply. We use this for the
* two-stage socks5 handshake.
*/
char address[MAX_SOCKS_ADDR_LEN]; /**< What address did the client ask to
connect to/resolve? */
uint16_t port; /**< What port did the client ask to connect to? */
unsigned int has_finished : 1; /**< Has the SOCKS handshake finished? Used to
* make sure we send back a socks reply for
* every connection. */
unsigned int got_auth : 1; /**< Have we received any authentication data? */
/** Number of bytes in username; 0 if username is NULL */
size_t usernamelen;
/** Number of bytes in password; 0 if password is NULL */
uint8_t passwordlen;
/** The negotiated username value if any (for socks5), or the entire
* authentication string (for socks4). This value is NOT nul-terminated;
* see usernamelen for its length. */
char *username;
/** The negotiated password value if any (for socks5). This value is NOT
* nul-terminated; see passwordlen for its length. */
char *password;
};
/********************************* circuitbuild.c **********************/
/** How many hops does a general-purpose circuit have by default? */
#define DEFAULT_ROUTE_LEN 3
/* Circuit Build Timeout "public" structures. */
/** Precision multiplier for the Bw weights */
#define BW_WEIGHT_SCALE 10000
#define BW_MIN_WEIGHT_SCALE 1
#define BW_MAX_WEIGHT_SCALE INT32_MAX
/** Total size of the circuit timeout history to accumulate.
* 1000 is approx 2.5 days worth of continual-use circuits. */
#define CBT_NCIRCUITS_TO_OBSERVE 1000
/** Width of the histogram bins in milliseconds */
#define CBT_BIN_WIDTH ((build_time_t)50)
/** Number of modes to use in the weighted-avg computation of Xm */
#define CBT_DEFAULT_NUM_XM_MODES 3
#define CBT_MIN_NUM_XM_MODES 1
#define CBT_MAX_NUM_XM_MODES 20
/** A build_time_t is milliseconds */
typedef uint32_t build_time_t;
/**
* CBT_BUILD_ABANDONED is our flag value to represent a force-closed
* circuit (Aka a 'right-censored' pareto value).
*/
#define CBT_BUILD_ABANDONED ((build_time_t)(INT32_MAX-1))
#define CBT_BUILD_TIME_MAX ((build_time_t)(INT32_MAX))
/** Save state every 10 circuits */
#define CBT_SAVE_STATE_EVERY 10
/* Circuit build times consensus parameters */
/**
* How long to wait before actually closing circuits that take too long to
* build in terms of CDF quantile.
*/
#define CBT_DEFAULT_CLOSE_QUANTILE 95
#define CBT_MIN_CLOSE_QUANTILE CBT_MIN_QUANTILE_CUTOFF
#define CBT_MAX_CLOSE_QUANTILE CBT_MAX_QUANTILE_CUTOFF
/**
* How many circuits count as recent when considering if the
* connection has gone gimpy or changed.
*/
#define CBT_DEFAULT_RECENT_CIRCUITS 20
#define CBT_MIN_RECENT_CIRCUITS 3
#define CBT_MAX_RECENT_CIRCUITS 1000
/**
* Maximum count of timeouts that finish the first hop in the past
* RECENT_CIRCUITS before calculating a new timeout.
*
* This tells us whether to abandon timeout history and set
* the timeout back to whatever circuit_build_times_get_initial_timeout()
* gives us.
*/
#define CBT_DEFAULT_MAX_RECENT_TIMEOUT_COUNT (CBT_DEFAULT_RECENT_CIRCUITS*9/10)
#define CBT_MIN_MAX_RECENT_TIMEOUT_COUNT 3
#define CBT_MAX_MAX_RECENT_TIMEOUT_COUNT 10000
/** Minimum circuits before estimating a timeout */
#define CBT_DEFAULT_MIN_CIRCUITS_TO_OBSERVE 100
#define CBT_MIN_MIN_CIRCUITS_TO_OBSERVE 1
#define CBT_MAX_MIN_CIRCUITS_TO_OBSERVE 10000
/** Cutoff percentile on the CDF for our timeout estimation. */
#define CBT_DEFAULT_QUANTILE_CUTOFF 80
#define CBT_MIN_QUANTILE_CUTOFF 10
#define CBT_MAX_QUANTILE_CUTOFF 99
double circuit_build_times_quantile_cutoff(void);
/** How often in seconds should we build a test circuit */
#define CBT_DEFAULT_TEST_FREQUENCY 60
#define CBT_MIN_TEST_FREQUENCY 1
#define CBT_MAX_TEST_FREQUENCY INT32_MAX
/** Lowest allowable value for CircuitBuildTimeout in milliseconds */
#define CBT_DEFAULT_TIMEOUT_MIN_VALUE (1500)
#define CBT_MIN_TIMEOUT_MIN_VALUE 500
#define CBT_MAX_TIMEOUT_MIN_VALUE INT32_MAX
/** Initial circuit build timeout in milliseconds */
#define CBT_DEFAULT_TIMEOUT_INITIAL_VALUE (60*1000)
#define CBT_MIN_TIMEOUT_INITIAL_VALUE CBT_MIN_TIMEOUT_MIN_VALUE
#define CBT_MAX_TIMEOUT_INITIAL_VALUE INT32_MAX
int32_t circuit_build_times_initial_timeout(void);
#if CBT_DEFAULT_MAX_RECENT_TIMEOUT_COUNT < CBT_MIN_MAX_RECENT_TIMEOUT_COUNT
#error "RECENT_CIRCUITS is set too low."
#endif
/** Information about the state of our local network connection */
typedef struct {
/** The timestamp we last completed a TLS handshake or received a cell */
time_t network_last_live;
/** If the network is not live, how many timeouts has this caused? */
int nonlive_timeouts;
/** Circular array of circuits that have made it to the first hop. Slot is
* 1 if circuit timed out, 0 if circuit succeeded */
int8_t *timeouts_after_firsthop;
/** Number of elements allocated for the above array */
int num_recent_circs;
/** Index into circular array. */
int after_firsthop_idx;
} network_liveness_t;
/** Structure for circuit build times history */
typedef struct {
/** The circular array of recorded build times in milliseconds */
build_time_t circuit_build_times[CBT_NCIRCUITS_TO_OBSERVE];
/** Current index in the circuit_build_times circular array */
int build_times_idx;
/** Total number of build times accumulated. Max CBT_NCIRCUITS_TO_OBSERVE */
int total_build_times;
/** Information about the state of our local network connection */
network_liveness_t liveness;
/** Last time we built a circuit. Used to decide to build new test circs */
time_t last_circ_at;
/** "Minimum" value of our pareto distribution (actually mode) */
build_time_t Xm;
/** alpha exponent for pareto dist. */
double alpha;
/** Have we computed a timeout? */
int have_computed_timeout;
/** The exact value for that timeout in milliseconds. Stored as a double
* to maintain precision from calculations to and from quantile value. */
double timeout_ms;
/** How long we wait before actually closing the circuit. */
double close_ms;
} circuit_build_times_t;
/********************************* config.c ***************************/
/** An error from options_trial_assign() or options_init_from_string(). */
typedef enum setopt_err_t {
SETOPT_OK = 0,
SETOPT_ERR_MISC = -1,
SETOPT_ERR_PARSE = -2,
SETOPT_ERR_TRANSITION = -3,
SETOPT_ERR_SETTING = -4,
} setopt_err_t;
/********************************* connection_edge.c *************************/
/** Enumerates possible origins of a client-side address mapping. */
typedef enum {
/** We're remapping this address because the controller told us to. */
ADDRMAPSRC_CONTROLLER,
/** We're remapping this address because of an AutomapHostsOnResolve
* configuration. */
ADDRMAPSRC_AUTOMAP,
/** We're remapping this address because our configuration (via torrc, the
* command line, or a SETCONF command) told us to. */
ADDRMAPSRC_TORRC,
/** We're remapping this address because we have TrackHostExit configured,
* and we want to remember to use the same exit next time. */
ADDRMAPSRC_TRACKEXIT,
/** We're remapping this address because we got a DNS resolution from a
* Tor server that told us what its value was. */
ADDRMAPSRC_DNS,
/** No remapping has occurred. This isn't a possible value for an
* addrmap_entry_t; it's used as a null value when we need to answer "Why
* did this remapping happen." */
ADDRMAPSRC_NONE
} addressmap_entry_source_t;
/********************************* control.c ***************************/
/** Used to indicate the type of a circuit event passed to the controller.
* The various types are defined in control-spec.txt */
typedef enum circuit_status_event_t {
CIRC_EVENT_LAUNCHED = 0,
CIRC_EVENT_BUILT = 1,
CIRC_EVENT_EXTENDED = 2,
CIRC_EVENT_FAILED = 3,
CIRC_EVENT_CLOSED = 4,
} circuit_status_event_t;
/** Used to indicate the type of a CIRC_MINOR event passed to the controller.
* The various types are defined in control-spec.txt . */
typedef enum circuit_status_minor_event_t {
CIRC_MINOR_EVENT_PURPOSE_CHANGED,
CIRC_MINOR_EVENT_CANNIBALIZED,
} circuit_status_minor_event_t;
/** Used to indicate the type of a stream event passed to the controller.
* The various types are defined in control-spec.txt */
typedef enum stream_status_event_t {
STREAM_EVENT_SENT_CONNECT = 0,
STREAM_EVENT_SENT_RESOLVE = 1,
STREAM_EVENT_SUCCEEDED = 2,
STREAM_EVENT_FAILED = 3,
STREAM_EVENT_CLOSED = 4,
STREAM_EVENT_NEW = 5,
STREAM_EVENT_NEW_RESOLVE = 6,
STREAM_EVENT_FAILED_RETRIABLE = 7,
STREAM_EVENT_REMAP = 8
} stream_status_event_t;
/** Used to indicate the type of an OR connection event passed to the
* controller. The various types are defined in control-spec.txt */
typedef enum or_conn_status_event_t {
OR_CONN_EVENT_LAUNCHED = 0,
OR_CONN_EVENT_CONNECTED = 1,
OR_CONN_EVENT_FAILED = 2,
OR_CONN_EVENT_CLOSED = 3,
OR_CONN_EVENT_NEW = 4,
} or_conn_status_event_t;
/** Used to indicate the type of a buildtime event */
typedef enum buildtimeout_set_event_t {
BUILDTIMEOUT_SET_EVENT_COMPUTED = 0,
BUILDTIMEOUT_SET_EVENT_RESET = 1,
BUILDTIMEOUT_SET_EVENT_SUSPENDED = 2,
BUILDTIMEOUT_SET_EVENT_DISCARD = 3,
BUILDTIMEOUT_SET_EVENT_RESUME = 4
} buildtimeout_set_event_t;
/** Execute the statement <b>stmt</b>, which may log events concerning the
* connection <b>conn</b>. To prevent infinite loops, disable log messages
* being sent to controllers if <b>conn</b> is a control connection.
*
* Stmt must not contain any return or goto statements.
*/
#define CONN_LOG_PROTECT(conn, stmt) \
STMT_BEGIN \
int _log_conn_is_control; \
tor_assert(conn); \
_log_conn_is_control = (conn->type == CONN_TYPE_CONTROL); \
if (_log_conn_is_control) \
disable_control_logging(); \
STMT_BEGIN stmt; STMT_END; \
if (_log_conn_is_control) \
enable_control_logging(); \
STMT_END
/** Enum describing various stages of bootstrapping, for use with controller
* bootstrap status events. The values range from 0 to 100. */
typedef enum {
BOOTSTRAP_STATUS_UNDEF=-1,
BOOTSTRAP_STATUS_STARTING=0,
BOOTSTRAP_STATUS_CONN_DIR=5,
BOOTSTRAP_STATUS_HANDSHAKE=-2,
BOOTSTRAP_STATUS_HANDSHAKE_DIR=10,
BOOTSTRAP_STATUS_ONEHOP_CREATE=15,
BOOTSTRAP_STATUS_REQUESTING_STATUS=20,
BOOTSTRAP_STATUS_LOADING_STATUS=25,
BOOTSTRAP_STATUS_LOADING_KEYS=40,
BOOTSTRAP_STATUS_REQUESTING_DESCRIPTORS=45,
BOOTSTRAP_STATUS_LOADING_DESCRIPTORS=50,
BOOTSTRAP_STATUS_CONN_OR=80,
BOOTSTRAP_STATUS_HANDSHAKE_OR=85,
BOOTSTRAP_STATUS_CIRCUIT_CREATE=90,
BOOTSTRAP_STATUS_DONE=100
} bootstrap_status_t;
/********************************* directory.c ***************************/
/** A pair of digests created by dir_split_resource_info_fingerprint_pairs() */
typedef struct {
char first[DIGEST_LEN];
char second[DIGEST_LEN];
} fp_pair_t;
/********************************* dirserv.c ***************************/
/** An enum to describe what format we're generating a routerstatus line in.
*/
typedef enum {
/** For use in a v2 opinion */
NS_V2,
/** For use in a consensus networkstatus document (ns flavor) */
NS_V3_CONSENSUS,
/** For use in a vote networkstatus document */
NS_V3_VOTE,
/** For passing to the controlport in response to a GETINFO request */
NS_CONTROL_PORT,
/** For use in a consensus networkstatus document (microdesc flavor) */
NS_V3_CONSENSUS_MICRODESC
} routerstatus_format_type_t;
#ifdef DIRSERV_PRIVATE
typedef struct measured_bw_line_t {
char node_id[DIGEST_LEN];
char node_hex[MAX_HEX_NICKNAME_LEN+1];
long int bw;
} measured_bw_line_t;
#endif
/********************************* dirvote.c ************************/
/** Describes the schedule by which votes should be generated. */
typedef struct vote_timing_t {
/** Length in seconds between one consensus becoming valid and the next
* becoming valid. */
int vote_interval;
/** For how many intervals is a consensus valid? */
int n_intervals_valid;
/** Time in seconds allowed to propagate votes */
int vote_delay;
/** Time in seconds allowed to propagate signatures */
int dist_delay;
} vote_timing_t;
/********************************* geoip.c **************************/
/** Round all GeoIP results to the next multiple of this value, to avoid
* leaking information. */
#define DIR_RECORD_USAGE_GRANULARITY 8
/** Time interval: Flush geoip data to disk this often. */
#define DIR_ENTRY_RECORD_USAGE_RETAIN_IPS (24*60*60)
/** How long do we have to have observed per-country request history before
* we are willing to talk about it? */
#define DIR_RECORD_USAGE_MIN_OBSERVATION_TIME (12*60*60)
/** Indicates an action that we might be noting geoip statistics on.
* Note that if we're noticing CONNECT, we're a bridge, and if we're noticing
* the others, we're not.
*/
typedef enum {
/** We've noticed a connection as a bridge relay or entry guard. */
GEOIP_CLIENT_CONNECT = 0,
/** We've served a networkstatus consensus as a directory server. */
GEOIP_CLIENT_NETWORKSTATUS = 1,
/** We've served a v2 networkstatus consensus as a directory server. */
GEOIP_CLIENT_NETWORKSTATUS_V2 = 2,
} geoip_client_action_t;
/** Indicates either a positive reply or a reason for rejectng a network
* status request that will be included in geoip statistics. */
typedef enum {
/** Request is answered successfully. */
GEOIP_SUCCESS = 0,
/** V3 network status is not signed by a sufficient number of requested
* authorities. */
GEOIP_REJECT_NOT_ENOUGH_SIGS = 1,
/** Requested network status object is unavailable. */
GEOIP_REJECT_UNAVAILABLE = 2,
/** Requested network status not found. */
GEOIP_REJECT_NOT_FOUND = 3,
/** Network status has not been modified since If-Modified-Since time. */
GEOIP_REJECT_NOT_MODIFIED = 4,
/** Directory is busy. */
GEOIP_REJECT_BUSY = 5,
} geoip_ns_response_t;
#define GEOIP_NS_RESPONSE_NUM 6
/** Directory requests that we are measuring can be either direct or
* tunneled. */
typedef enum {
DIRREQ_DIRECT = 0,
DIRREQ_TUNNELED = 1,
} dirreq_type_t;
/** Possible states for either direct or tunneled directory requests that
* are relevant for determining network status download times. */
typedef enum {
/** Found that the client requests a network status; applies to both
* direct and tunneled requests; initial state of a request that we are
* measuring. */
DIRREQ_IS_FOR_NETWORK_STATUS = 0,
/** Finished writing a network status to the directory connection;
* applies to both direct and tunneled requests; completes a direct
* request. */
DIRREQ_FLUSHING_DIR_CONN_FINISHED = 1,
/** END cell sent to circuit that initiated a tunneled request. */
DIRREQ_END_CELL_SENT = 2,
/** Flushed last cell from queue of the circuit that initiated a
* tunneled request to the outbuf of the OR connection. */
DIRREQ_CIRC_QUEUE_FLUSHED = 3,
/** Flushed last byte from buffer of the channel belonging to the
* circuit that initiated a tunneled request; completes a tunneled
* request. */
DIRREQ_CHANNEL_BUFFER_FLUSHED = 4
} dirreq_state_t;
#define WRITE_STATS_INTERVAL (24*60*60)
/********************************* microdesc.c *************************/
typedef struct microdesc_cache_t microdesc_cache_t;
/********************************* networkstatus.c *********************/
/** Location where we found a v2 networkstatus. */
typedef enum {
NS_FROM_CACHE, NS_FROM_DIR_BY_FP, NS_FROM_DIR_ALL, NS_GENERATED
} v2_networkstatus_source_t;
/** Possible statuses of a version of Tor, given opinions from the directory
* servers. */
typedef enum version_status_t {
VS_RECOMMENDED=0, /**< This version is listed as recommended. */
VS_OLD=1, /**< This version is older than any recommended version. */
VS_NEW=2, /**< This version is newer than any recommended version. */
VS_NEW_IN_SERIES=3, /**< This version is newer than any recommended version
* in its series, but later recommended versions exist.
*/
VS_UNRECOMMENDED=4, /**< This version is not recommended (general case). */
VS_EMPTY=5, /**< The version list was empty; no agreed-on versions. */
VS_UNKNOWN, /**< We have no idea. */
} version_status_t;
/********************************* policies.c ************************/
/** Outcome of applying an address policy to an address. */
typedef enum {
/** The address was accepted */
ADDR_POLICY_ACCEPTED=0,
/** The address was rejected */
ADDR_POLICY_REJECTED=-1,
/** Part of the address was unknown, but as far as we can tell, it was
* accepted. */
ADDR_POLICY_PROBABLY_ACCEPTED=1,
/** Part of the address was unknown, but as far as we can tell, it was
* rejected. */
ADDR_POLICY_PROBABLY_REJECTED=2,
} addr_policy_result_t;
/********************************* rephist.c ***************************/
/** Possible public/private key operations in Tor: used to keep track of where
* we're spending our time. */
typedef enum {
SIGN_DIR, SIGN_RTR,
VERIFY_DIR, VERIFY_RTR,
ENC_ONIONSKIN, DEC_ONIONSKIN,
TLS_HANDSHAKE_C, TLS_HANDSHAKE_S,
REND_CLIENT, REND_MID, REND_SERVER,
} pk_op_t;
/********************************* rendcommon.c ***************************/
/** Hidden-service side configuration of client authorization. */
typedef struct rend_authorized_client_t {
char *client_name;
char descriptor_cookie[REND_DESC_COOKIE_LEN];
crypto_pk_t *client_key;
} rend_authorized_client_t;
/** ASCII-encoded v2 hidden service descriptor. */
typedef struct rend_encoded_v2_service_descriptor_t {
char desc_id[DIGEST_LEN]; /**< Descriptor ID. */
char *desc_str; /**< Descriptor string. */
} rend_encoded_v2_service_descriptor_t;
/** The maximum number of non-circuit-build-timeout failures a hidden
* service client will tolerate while trying to build a circuit to an
* introduction point. See also rend_intro_point_t.unreachable_count. */
#define MAX_INTRO_POINT_REACHABILITY_FAILURES 5
/** The maximum number of distinct INTRODUCE2 cells which a hidden
* service's introduction point will receive before it begins to
* expire.
*
* XXX023 Is this number at all sane? */
#define INTRO_POINT_LIFETIME_INTRODUCTIONS 16384
/** The minimum number of seconds that an introduction point will last
* before expiring due to old age. (If it receives
* INTRO_POINT_LIFETIME_INTRODUCTIONS INTRODUCE2 cells, it may expire
* sooner.)
*
* XXX023 Should this be configurable? */
#define INTRO_POINT_LIFETIME_MIN_SECONDS 18*60*60
/** The maximum number of seconds that an introduction point will last
* before expiring due to old age.
*
* XXX023 Should this be configurable? */
#define INTRO_POINT_LIFETIME_MAX_SECONDS 24*60*60
/** Introduction point information. Used both in rend_service_t (on
* the service side) and in rend_service_descriptor_t (on both the
* client and service side). */
typedef struct rend_intro_point_t {
extend_info_t *extend_info; /**< Extend info of this introduction point. */
crypto_pk_t *intro_key; /**< Introduction key that replaces the service
* key, if this descriptor is V2. */
/** (Client side only) Flag indicating that a timeout has occurred
* after sending an INTRODUCE cell to this intro point. After a
* timeout, an intro point should not be tried again during the same
* hidden service connection attempt, but it may be tried again
* during a future connection attempt. */
unsigned int timed_out : 1;
/** (Client side only) The number of times we have failed to build a
* circuit to this intro point for some reason other than our
* circuit-build timeout. See also MAX_INTRO_POINT_REACHABILITY_FAILURES. */
unsigned int unreachable_count : 3;
/** (Service side only) Flag indicating that this intro point was
* included in the last HS descriptor we generated. */
unsigned int listed_in_last_desc : 1;
/** (Service side only) Flag indicating that
* rend_service_note_removing_intro_point has been called for this
* intro point. */
unsigned int rend_service_note_removing_intro_point_called : 1;
/** (Service side only) A replay cache recording the RSA-encrypted parts
* of INTRODUCE2 cells this intro point's circuit has received. This is
* used to prevent replay attacks. */
replaycache_t *accepted_intro_rsa_parts;
/** (Service side only) Count of INTRODUCE2 cells accepted from this
* intro point.
*/
int accepted_introduce2_count;
/** (Service side only) The time at which this intro point was first
* published, or -1 if this intro point has not yet been
* published. */
time_t time_published;
/** (Service side only) The time at which this intro point should
* (start to) expire, or -1 if we haven't decided when this intro
* point should expire. */
time_t time_to_expire;
/** (Service side only) The time at which we decided that this intro
* point should start expiring, or -1 if this intro point is not yet
* expiring.
*
* This field also serves as a flag to indicate that we have decided
* to expire this intro point, in case intro_point_should_expire_now
* flaps (perhaps due to a clock jump; perhaps due to other
* weirdness, or even a (present or future) bug). */
time_t time_expiring;
} rend_intro_point_t;
#define REND_PROTOCOL_VERSION_BITMASK_WIDTH 16
/** Information used to connect to a hidden service. Used on both the
* service side and the client side. */
typedef struct rend_service_descriptor_t {
crypto_pk_t *pk; /**< This service's public key. */
int version; /**< Version of the descriptor format: 0 or 2. */
time_t timestamp; /**< Time when the descriptor was generated. */
/** Bitmask: which rendezvous protocols are supported?
* (We allow bits '0', '1', and '2' to be set.) */
int protocols : REND_PROTOCOL_VERSION_BITMASK_WIDTH;
/** List of the service's introduction points. Elements are removed if
* introduction attempts fail. */
smartlist_t *intro_nodes;
/** Has descriptor been uploaded to all hidden service directories? */
int all_uploads_performed;
/** List of hidden service directories to which an upload request for
* this descriptor could be sent. Smartlist exists only when at least one
* of the previous upload requests failed (otherwise it's not important
* to know which uploads succeeded and which not). */
smartlist_t *successful_uploads;
} rend_service_descriptor_t;
/** A cached rendezvous descriptor. */
typedef struct rend_cache_entry_t {
size_t len; /**< Length of <b>desc</b> */
time_t received; /**< When was the descriptor received? */
char *desc; /**< Service descriptor */
rend_service_descriptor_t *parsed; /**< Parsed value of 'desc' */
} rend_cache_entry_t;
/********************************* routerlist.c ***************************/
/** Represents information about a single trusted or fallback directory
* server. */
typedef struct dir_server_t {
char *description;
char *nickname;
char *address; /**< Hostname. */
uint32_t addr; /**< IPv4 address. */
uint16_t dir_port; /**< Directory port. */
uint16_t or_port; /**< OR port: Used for tunneling connections. */
double weight; /** Weight used when selecting this node at random */
char digest[DIGEST_LEN]; /**< Digest of identity key. */
char v3_identity_digest[DIGEST_LEN]; /**< Digest of v3 (authority only,
* high-security) identity key. */
unsigned int is_running:1; /**< True iff we think this server is running. */
unsigned int is_authority:1; /**< True iff this is a directory authority
* of some kind. */
/** True iff this server has accepted the most recent server descriptor
* we tried to upload to it. */
unsigned int has_accepted_serverdesc:1;
/** What kind of authority is this? (Bitfield.) */
dirinfo_type_t type;
download_status_t v2_ns_dl_status; /**< Status of downloading this server's
* v2 network status. */
time_t addr_current_at; /**< When was the document that we derived the
* address information from published? */
routerstatus_t fake_status; /**< Used when we need to pass this trusted
* dir_server_t to directory_initiate_command_*
* as a routerstatus_t. Not updated by the
* router-status management code!
**/
} dir_server_t;
#define ROUTER_REQUIRED_MIN_BANDWIDTH (20*1024)
#define ROUTER_MAX_DECLARED_BANDWIDTH INT32_MAX
/* Flags for pick_directory_server() and pick_trusteddirserver(). */
/** Flag to indicate that we should not automatically be willing to use
* ourself to answer a directory request.
* Passed to router_pick_directory_server (et al).*/
#define PDS_ALLOW_SELF (1<<0)
/** Flag to indicate that if no servers seem to be up, we should mark all
* directory servers as up and try again.
* Passed to router_pick_directory_server (et al).*/
#define PDS_RETRY_IF_NO_SERVERS (1<<1)
/** Flag to indicate that we should not exclude directory servers that
* our ReachableAddress settings would exclude. This usually means that
* we're going to connect to the server over Tor, and so we don't need to
* worry about our firewall telling us we can't.
* Passed to router_pick_directory_server (et al).*/
#define PDS_IGNORE_FASCISTFIREWALL (1<<2)
/** Flag to indicate that we should not use any directory authority to which
* we have an existing directory connection for downloading server descriptors
* or extrainfo documents.
*
* Passed to router_pick_directory_server (et al)
*
* [XXXX NOTE: This option is only implemented for pick_trusteddirserver,
* not pick_directory_server. If we make it work on pick_directory_server
* too, we could conservatively make it only prevent multiple fetches to
* the same authority, or we could aggressively make it prevent multiple
* fetches to _any_ single directory server.]
*/
#define PDS_NO_EXISTING_SERVERDESC_FETCH (1<<3)
#define PDS_NO_EXISTING_MICRODESC_FETCH (1<<4)
#define PDS_PREFER_TUNNELED_DIR_CONNS_ (1<<16)
/** Possible ways to weight routers when choosing one randomly. See
* routerlist_sl_choose_by_bandwidth() for more information.*/
typedef enum bandwidth_weight_rule_t {
NO_WEIGHTING, WEIGHT_FOR_EXIT, WEIGHT_FOR_MID, WEIGHT_FOR_GUARD,
WEIGHT_FOR_DIR
} bandwidth_weight_rule_t;
/** Flags to be passed to control router_choose_random_node() to indicate what
* kind of nodes to pick according to what algorithm. */
typedef enum {
CRN_NEED_UPTIME = 1<<0,
CRN_NEED_CAPACITY = 1<<1,
CRN_NEED_GUARD = 1<<2,
CRN_ALLOW_INVALID = 1<<3,
/* XXXX not used, apparently. */
CRN_WEIGHT_AS_EXIT = 1<<5,
CRN_NEED_DESC = 1<<6
} router_crn_flags_t;
/** Return value for router_add_to_routerlist() and dirserv_add_descriptor() */
typedef enum was_router_added_t {
ROUTER_ADDED_SUCCESSFULLY = 1,
ROUTER_ADDED_NOTIFY_GENERATOR = 0,
ROUTER_BAD_EI = -1,
ROUTER_WAS_NOT_NEW = -2,
ROUTER_NOT_IN_CONSENSUS = -3,
ROUTER_NOT_IN_CONSENSUS_OR_NETWORKSTATUS = -4,
ROUTER_AUTHDIR_REJECTS = -5,
ROUTER_WAS_NOT_WANTED = -6
} was_router_added_t;
/********************************* routerparse.c ************************/
#define MAX_STATUS_TAG_LEN 32
/** Structure to hold parsed Tor versions. This is a little messier
* than we would like it to be, because we changed version schemes with 0.1.0.
*
* See version-spec.txt for the whole business.
*/
typedef struct tor_version_t {
int major;
int minor;
int micro;
/** Release status. For version in the post-0.1 format, this is always
* VER_RELEASE. */
enum { VER_PRE=0, VER_RC=1, VER_RELEASE=2, } status;
int patchlevel;
char status_tag[MAX_STATUS_TAG_LEN];
int svn_revision;
int git_tag_len;
char git_tag[DIGEST_LEN];
} tor_version_t;
#endif
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