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tor/src/or/or.h

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/* Copyright 2001 Matej Pfajfar.
* Copyright 2001-2004 Roger Dingledine.
* Copyright 2004-2005 Roger Dingledine, Nick Mathewson. */
/* See LICENSE for licensing information */
/* $Id$ */
/**
* \file or.h
* \brief Master header file for Tor-specific functionality.
**/
#ifndef __OR_H
#define __OR_H
#define OR_H_ID "$Id$"
#include "orconfig.h"
#ifdef MS_WINDOWS
#define WIN32_WINNT 0x400
#define _WIN32_WINNT 0x400
#define WIN32_LEAN_AND_MEAN
#endif
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_CTYPE_H
#include <ctype.h>
#endif
#include "../common/torint.h"
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h> /* FreeBSD needs this to know what version it is */
#endif
#ifdef HAVE_SYS_LIMITS_H
#include <sys/limits.h>
#endif
#ifdef HAVE_MACHINE_LIMITS_H
#ifndef __FreeBSD__
/* FreeBSD has a bug where it complains that this file is obsolete,
and I should migrate to using sys/limits. It complains even when
I include both. */
#include <machine/limits.h>
#endif
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h> /* Must be included before sys/stat.h for Ultrix */
#endif
#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_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.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
/** Upper bound on maximum simultaneous connections; can be lowered by
* config file. */
#define MAXCONNECTIONS 15000
#ifdef MS_WINDOWS
/* No, we don't need to redefine FD_SETSIZE before including winsock:
* we use libevent now, and libevent handles the select() stuff. Yes,
* some documents imply that we need to redefine anyway if we're using
* select() anywhere in our application or in anything it links to: these
* documents are either the holy texts of a cargo cult of network
* programmers, or more likely a simplification of what's going on for
* people who haven't read winsock[2].c for themselves.
*/
#if (_MSC_VER <= 1300)
#include <winsock.h>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#endif
#ifdef MS_WINDOWS
#include <io.h>
#include <process.h>
#include <direct.h>
#include <windows.h>
#define snprintf _snprintf
#endif
#ifdef HAVE_EVENT_H
#include <event.h>
#else
#error "Tor requires libevent to build."
#endif
#include "../common/crypto.h"
#include "../common/tortls.h"
#include "../common/log.h"
#include "../common/compat.h"
#include "../common/container.h"
#include "../common/util.h"
#include "../common/torgzip.h"
/* These signals are defined to help control_signal_act work.
* XXXX Move into compat.h ?
*/
#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
#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
#define DEFAULT_BANDWIDTH_OP (1024 * 1000)
#define MAX_NICKNAME_LEN 19
/* Hex digest plus dollar sign. */
#define MAX_HEX_NICKNAME_LEN (HEX_DIGEST_LEN+1)
/** Maximum size, in bytes, for resized buffers. */
#define MAX_BUF_SIZE ((1<<24)-1)
#define MAX_DIR_SIZE MAX_BUF_SIZE
/* For http parsing */
#define MAX_HEADERS_SIZE 50000
#define MAX_BODY_SIZE 500000
#ifdef TOR_PERF
/** How long do we keep DNS cache entries before purging them? */
#define MAX_DNS_ENTRY_AGE (150*60)
#else
#define MAX_DNS_ENTRY_AGE (30*60)
#endif
/** How often do we rotate onion keys? */
#define MIN_ONION_KEY_LIFETIME (7*24*60*60) /* once a week */
/** How often do we rotate TLS contexts? */
#define MAX_SSL_KEY_LIFETIME (120*60)
/** How old do we allow a router to get before removing it, either
* from the descriptor list (for dirservers) or the router list (for others)?
* In seconds. */
#define ROUTER_MAX_AGE (60*60*24)
typedef enum {
CIRC_ID_TYPE_LOWER=0,
CIRC_ID_TYPE_HIGHER=1
} 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 DNS worker process. */
#define CONN_TYPE_DNSWORKER 10
/** Connection from the main process to a CPU worker process. */
#define CONN_TYPE_CPUWORKER 11
/** Type for listenting for connections from user interface process */
#define CONN_TYPE_CONTROL_LISTENER 12
/** Type for connections from user interface process */
#define CONN_TYPE_CONTROL 13
#define _CONN_TYPE_MAX 13
#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 _DNSWORKER_STATE_MIN 1
/** State for a connection to a dnsworker process that's idle. */
#define DNSWORKER_STATE_IDLE 1
/** State for a connection to a dnsworker process that's resolving a hostname. */
#define DNSWORKER_STATE_BUSY 2
#define _DNSWORKER_STATE_MAX 2
#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 command to flush. */
#define OR_CONN_STATE_PROXY_FLUSHING 2
/** State for a connection to an OR: waiting for proxy response. */
#define OR_CONN_STATE_PROXY_READING 3
/** State for a connection to an OR: SSL is handshaking, not done yet. */
#define OR_CONN_STATE_HANDSHAKING 4
/** State for a connection to an OR: Ready to send/receive cells. */
#define OR_CONN_STATE_OPEN 5
#define _OR_CONN_STATE_MAX 5
#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 rescriptor. */
#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: send 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
#define _AP_CONN_STATE_MAX 11
#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
#define _CONTROL_CONN_STATE_MIN 1
#define CONTROL_CONN_STATE_OPEN_V0 1
#define CONTROL_CONN_STATE_OPEN_V1 2
#define CONTROL_CONN_STATE_NEEDAUTH_V0 3
#define CONTROL_CONN_STATE_NEEDAUTH_V1 4
#define _CONTROL_CONN_STATE_MAX 4
#define _DIR_PURPOSE_MIN 1
/** Purpose for connection to directory server: download a directory. */
#define DIR_PURPOSE_FETCH_DIR 1
/** Purpose for connection to directory server: download just the list
* of running routers. */
#define DIR_PURPOSE_FETCH_RUNNING_LIST 2
/** Purpose for connection to directory server: download a rendezvous
* descriptor. */
#define DIR_PURPOSE_FETCH_RENDDESC 3
/** Purpose for connection to 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 network-status
* objects */
#define DIR_PURPOSE_FETCH_NETWORKSTATUS 5
/** A connection to a directory server: download one or more server
* descriptors. */
#define DIR_PURPOSE_FETCH_SERVERDESC 6
/** Purpose for connection to directory server: upload a server descriptor. */
#define DIR_PURPOSE_UPLOAD_DIR 7
/** Purpose for connection to directory server: upload a rendezvous
* descriptor. */
#define DIR_PURPOSE_UPLOAD_RENDDESC 8
/** Purpose for connection at a directory server. */
#define DIR_PURPOSE_SERVER 9
#define _DIR_PURPOSE_MAX 9
#define _EXIT_PURPOSE_MIN 1
#define EXIT_PURPOSE_CONNECT 1
#define EXIT_PURPOSE_RESOLVE 2
#define _EXIT_PURPOSE_MAX 2
/** Circuit state: I'm the OP, 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_conn is still connecting. */
#define CIRCUIT_STATE_OR_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
/** Hidden-service-side circuit purpose: at Bob, waiting for introductions. */
#define CIRCUIT_PURPOSE_S_ESTABLISH_INTRO 13
/** Hidden-service-side circuit purpose: at Bob, successfully established
* intro. */
#define CIRCUIT_PURPOSE_S_INTRO 14
/** Hidden-service-side circuit purpose: at Bob, connecting to rend point. */
#define CIRCUIT_PURPOSE_S_CONNECT_REND 15
/** Hidden-service-side circuit purpose: at Bob, rendezvous established. */
#define CIRCUIT_PURPOSE_S_REND_JOINED 16
/** A testing circuit; not meant to be used for actual traffic. */
#define CIRCUIT_PURPOSE_TESTING 17
#define _CIRCUIT_PURPOSE_MAX 17
/** True iff the circuit purpose <b>p</b> is for a circuit at the OP
* that this OP has originated. */
#define CIRCUIT_PURPOSE_IS_ORIGIN(p) ((p)>_CIRCUIT_PURPOSE_OR_MAX)
#define CIRCUIT_IS_ORIGIN(c) (CIRCUIT_PURPOSE_IS_ORIGIN((c)->purpose))
#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_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
#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
/* 8 is unallocated. */
#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
/* 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. */
#define END_STREAM_REASON_ALREADY_SOCKS_REPLIED 256
#define END_STREAM_REASON_CANT_ATTACH 257
#define END_STREAM_REASON_NET_UNREACHABLE 258
#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
/** Length of 'y' portion of 'y.onion' URL. */
#define REND_SERVICE_ID_LEN 16
#define CELL_DIRECTION_IN 1
#define CELL_DIRECTION_OUT 2
#ifdef TOR_PERF
#define CIRCWINDOW_START 10000
#define CIRCWINDOW_INCREMENT 1000
#define STREAMWINDOW_START 5000
#define STREAMWINDOW_INCREMENT 500
#else
#define CIRCWINDOW_START 1000
#define CIRCWINDOW_INCREMENT 100
#define STREAMWINDOW_START 500
#define STREAMWINDOW_INCREMENT 50
#endif
/* cell commands */
#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
/* people behind fascist firewalls use only these ports */
#define REQUIRED_FIREWALL_DIRPORT 80
#define REQUIRED_FIREWALL_ORPORT 443
/* legal characters in a nickname */
#define LEGAL_NICKNAME_CHARACTERS "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
/** Name to use in client TLS certificates if no nickname is given.*/
#define DEFAULT_CLIENT_NICKNAME "client"
#define SOCKS4_NETWORK_LEN 8
typedef enum {
SOCKS5_SUCCEEDED = 0x00,
SOCKS5_GENERAL_ERROR = 0x01,
SOCKS5_NOT_ALLOWED = 0x02,
SOCKS5_NET_UNREACHABLE = 0x03,
SOCKS5_HOST_UNREACHABLE = 0x04,
SOCKS5_CONNECTION_REFUSED = 0x05,
SOCKS5_TTL_EXPIRED = 0x06,
SOCKS5_COMMAND_NOT_SUPPORTED = 0x07,
SOCKS5_ADDRESS_TYPE_NOT_SUPPORTED = 0x08,
} socks5_reply_status_t;
/*
* 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]
*/
#define CELL_PAYLOAD_SIZE 509
#define CELL_NETWORK_SIZE 512
#define RELAY_HEADER_SIZE (1+2+2+4+2)
#define RELAY_PAYLOAD_SIZE (CELL_PAYLOAD_SIZE-RELAY_HEADER_SIZE)
/** Parsed onion routing cell. All communication from OP-to-OR, or from
* OR-to-OR, is via cells. */
typedef struct {
uint16_t circ_id; /**< Circuit which received the cell. */
uint8_t command; /**< Type of the cell: one of PADDING, CREATE, RELAY,
* or DESTROY. */
char payload[CELL_PAYLOAD_SIZE]; /**< Cell body. */
} cell_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. */
uint16_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;
#define CONNECTION_MAGIC 0x7C3C304Eu
/** 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 an onion router on the other end, an "OP connection"
* (nearly obsolete) has an onion proxy 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.
*/
struct connection_t {
uint32_t magic; /**< For memory debugging: must equal CONNECTION_MAGIC. */
uint8_t type; /**< What kind of connection is this? */
uint8_t state; /**< Current state of this connection. */
uint8_t purpose; /**< Only used for DIR types currently. */
uint8_t wants_to_read; /**< Boolean: should we start reading again once
* the bandwidth throttler allows it?
*/
uint8_t wants_to_write; /**< Boolean: should we start writing again once
* the bandwidth throttler allows reads?
*/
int s; /**< Our socket; -1 if this connection is closed. */
int poll_index; /* XXXX rename. */
struct event *read_event; /**< libevent event structure. */
struct event *write_event; /**< libevent event structure. */
int marked_for_close; /**< Boolean: should we close this conn on the next
* iteration of the main loop?
*/
const char *marked_for_close_file; /**< For debugging: in which file were
* we marked for close? */
int hold_open_until_flushed; /**< Despite this connection's being marked
* for close, do we flush it before closing it?
*/
buf_t *inbuf; /**< Buffer holding data read over this connection. */
int inbuf_reached_eof; /**< Boolean: did read() return 0 on this conn? */
time_t timestamp_lastread; /**< When was the last time poll() said we could read? */
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_lastwritten; /**< When was the last time poll() said we could write? */
time_t timestamp_created; /**< When was this connection_t created? */
time_t timestamp_lastempty; /**< When was the outbuf last completely empty?*/
uint32_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. */
char *address; /**< FQDN (or IP) of the guy on the other end.
* strdup into this, because free_connection frees it.
*/
crypto_pk_env_t *identity_pkey; /**< Public RSA key for the other side's
* signing key. */
char identity_digest[DIGEST_LEN]; /**< Hash of identity_pkey */
char *nickname; /**< Nickname of OR on other side (if any). */
/** Nickname of planned exit node -- used with .exit support. */
char *chosen_exit_name;
/* Used only by OR connections: */
tor_tls *tls; /**< TLS connection state (OR only.) */
uint16_t next_circ_id; /**< Which circ_id do we try to use next on
* this connection? This is always in the
* range 0..1<<15-1. (OR only.)*/
/* bandwidth and receiver_bucket only used by ORs in OPEN state: */
int bandwidth; /**< Connection bandwidth. (OPEN ORs only.) */
int receiver_bucket; /**< When this hits 0, stop receiving. Every second we
* add 'bandwidth' to this, capping it at 10*bandwidth.
* (OPEN ORs only)
*/
circ_id_type_t circ_id_type; /**< When we send CREATE cells along this
* connection, which half of the space should
* we use? */
/* Used only by DIR and AP connections: */
char rend_query[REND_SERVICE_ID_LEN+1]; /**< What rendezvous service are we
* querying for? (DIR/AP only) */
/* Used only by edge connections: */
uint16_t stream_id;
struct connection_t *next_stream; /**< Points to the next stream at this
* edge, if any (Edge only). */
struct crypt_path_t *cpath_layer; /**< A pointer to which node in the circ
* this conn exits at. (Edge only.) */
int package_window; /**< How many more relay cells can i send into the
* circuit? (Edge only.) */
int deliver_window; /**< How many more relay cells can end at me? (Edge
* only.) */
int done_sending; /**< For half-open connections; not used currently. */
int done_receiving; /**< For half-open connections; not used currently. */
char has_sent_end; /**< For debugging: set once we've set the stream end,
and check in circuit_about_to_close_connection(). */
struct circuit_t *on_circuit; /**< The circuit (if any) that this edge
* connection is using. */
/* Used only by Dir connections */
char *requested_resource; /**< Which 'resource' did we ask the directory for?*/
/* Used only by AP connections */
socks_request_t *socks_request; /**< SOCKS structure describing request (AP
* only.) */
/** Quasi-global identifier for this connection; used for control.c */
/* XXXX NM This can get re-used after 2**32 circuits. */
uint32_t global_identifier;
/* Used only by control connections */
uint32_t event_mask;
uint32_t incoming_cmd_len;
uint32_t incoming_cmd_cur_len;
char *incoming_cmd;
/* Used only by control v0 connections */
uint16_t incoming_cmd_type;
};
typedef struct connection_t connection_t;
typedef enum {
ADDR_POLICY_ACCEPT=1,
ADDR_POLICY_REJECT=2,
} addr_policy_action_t;
/** A linked list of policy rules */
typedef struct addr_policy_t {
addr_policy_action_t policy_type; /**< What to do when the policy matches.*/
char *string; /**< String representation of this rule. */
uint32_t addr; /**< Base address to accept or reject. */
uint32_t msk; /**< Accept/reject all addresses <b>a</b> such that
* a &amp; msk == <b>addr</b> &amp; msk . */
uint16_t prt_min; /**< Lowest port number to accept/reject. */
uint16_t prt_max; /**< Highest port number to accept/reject. */
struct addr_policy_t *next; /**< Next rule in list. */
} 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 */
char *dir_z; /**< Compressed contents of this object. */
size_t dir_len; /**< Length of <b>dir</b> */
size_t dir_z_len; /**< Length of <b>dir_z</b> */
time_t published; /**< When was this object published */
} cached_dir_t;
/** Information about another onion router in the network. */
typedef struct {
char *signed_descriptor; /**< The original signed descriptor for this router*/
size_t signed_descriptor_len; /**< The length of signed_descriptor */
char signed_descriptor_digest[DIGEST_LEN]; /**< The digest of the signed descriptor. */
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 OR-to-OR and OP-to-OR connections. */
uint16_t dir_port; /**< Port for HTTP directory connections. */
time_t published_on; /**< When was the information in this routerinfo_t
* published? */
crypto_pk_env_t *onion_pkey; /**< Public RSA key for onions. */
crypto_pk_env_t *identity_pkey; /**< Public RSA key for signing. */
char identity_digest[DIGEST_LEN]; /**< Digest of identity key */
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;
addr_policy_t *exit_policy; /**< What streams will this OR permit
* to exit? */
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 */
/* local info */
unsigned int is_running:1; /**< As far as we know, is this OR currently
* running? */
unsigned int is_verified:1; /**< Has a trusted dirserver validated this OR?
* (For Authdir: Have we validated this OR?)
*/
/*XXXX Make this get used once we think we do naming right. NM */
unsigned int is_named:1; /* Do we believe the nickname that this OR gives us? */
/* 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;
/** When did we start testing reachability for this OR? */
time_t testing_since;
/** How many times has a descriptor been posted and we believed
* this router to be unreachable? We only actually warn on the third. */
int num_unreachable_notifications;
} routerinfo_t;
#if 0
/** Contents of a running-routers list */
typedef struct running_routers_t {
time_t published_on; /**< When was the list marked as published? */
/** Which ORs are on the list? Entries may be prefixed with ! and $. */
smartlist_t *running_routers;
} running_routers_t;
#endif
/** Contents of a single per-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. */
char descriptor_digest[DIGEST_LEN]; /**< Digest of the router's most recent
* descriptor. */
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. */
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. */
unsigned int is_running:1; /**< True iff this router is up. */
unsigned int is_named:1; /**< True iff "nickname" belongs to this router. */
unsigned int is_valid:1; /**< True iff this router is validated. */
} routerstatus_t;
/** Contents of a (v2 or later) network status object. */
typedef struct networkstatus_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. */
char identity_digest[DIGEST_LEN]; /**< Digest of signing key. */
char *contact; /**< How to contact directory admin? (may be NULL). */
crypto_pk_env_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. */
int binds_names:1; /**< True iff this directory server binds names. */
smartlist_t *entries; /**< List of router_status_t*. This list is kept
* sorted by identity_digest. */
} networkstatus_t;
/** Contents of a directory of onion routers. */
typedef struct {
/** List of routerinfo_t. */
smartlist_t *routers;
/** When was the most recent directory that contributed to this list
* published? */
/* XXXX011 NM This field is only used in moribund code; remove it
* once the moribund code is dead. */
time_t published_on_xx;
#if 0
/** Which versions of tor are recommended by this directory? */
char *software_versions;
time_t running_routers_updated_on;
/** What is the most recently received running_routers structure? */
running_routers_t *running_routers;
#endif
} 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.) */
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. */
uint32_t addr; /**< IP address in host order. */
uint16_t port; /**< OR port. */
crypto_pk_env_t *onion_key; /**< Current onionskin key. */
} extend_info_t;
#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_env_t *f_crypto;
/** Encryption key and counter for cells heading back from the OR at this
* step. */
crypto_cipher_env_t *b_crypto;
/** Digest state for cells heading towards the OR at this step. */
crypto_digest_env_t *f_digest; /* for integrity checking */
/** Digest state for cells heading away from the OR at this step. */
crypto_digest_env_t *b_digest;
/** Current state of Diffie-Hellman key negotiation with the OR at this
* step. */
crypto_dh_env_t *dh_handshake_state;
char 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 bytes are we allowed to originate ending
* at this step? */
int deliver_window; /**< How many bytes are we willing to deliver originating
* at this step? */
} crypt_path_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)
#define REND_COOKIE_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. */
int need_uptime;
/** Whether every node in the circ must have adequate capacity. */
int need_capacity;
/** Whether the last hop was picked with exiting in mind. */
int is_internal;
/** The crypt_path_t to append after rendezvous: used for rendezvous. */
crypt_path_t *pending_final_cpath;
/** 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 CIRCUIT_MAGIC 0x35315243u
/**
* 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 fills two roles. First, a 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, a 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.
*/
struct circuit_t {
uint32_t magic; /**< For memory debugging: must equal CIRCUIT_MAGIC. */
int marked_for_close; /**< Should we close this circuit at the end of the
* main loop? */
const char *marked_for_close_file; /**< For debugging: in which file was this
* circuit marked for close? */
/** The IPv4 address of the OR that is next in this circuit. */
uint32_t n_addr;
/** The port for the OR that is next in this circuit. */
uint16_t n_port;
/** The OR connection that is previous in this circuit. */
connection_t *p_conn;
/** The OR connection that is next in this circuit. */
connection_t *n_conn;
/** The identity hash of n_conn. */
char n_conn_id_digest[DIGEST_LEN];
/** Linked list of AP streams associated with this circuit. */
connection_t *p_streams;
/** Linked list of Exit streams associated with this circuit. */
connection_t *n_streams;
/** Linked list of Exit streams associated with this circuit that are
* still being resolved. */
connection_t *resolving_streams;
/** The next stream_id that will be tried when we're attempting to
* construct a new AP stream originating at this circuit. */
uint16_t next_stream_id;
/** 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;
/** The circuit_id used in the previous (backward) hop of this circuit. */
uint16_t p_circ_id;
/** The circuit_id used in the next (forward) hop of this circuit. */
uint16_t n_circ_id;
/** The cipher used by intermediate hops for cells heading toward the
* OP. */
crypto_cipher_env_t *p_crypto;
/** The cipher used by intermediate hops for cells heading away from
* the OP. */
crypto_cipher_env_t *n_crypto;
/** The integrity-checking digest used by intermediate hops, for
* cells packaged here and heading towards the OP.
*/
crypto_digest_env_t *p_digest;
/** The integrity-checking digest used by intermediate hops, for
* cells packaged at the OP and arriving here.
*/
crypto_digest_env_t *n_digest;
/** 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.
*
* The cpath field is defined only when we are the circuit's origin.
*/
crypt_path_t *cpath;
/** For storage while passing to cpuworker, or while n_conn is pending. */
char onionskin[ONIONSKIN_CHALLENGE_LEN];
char handshake_digest[DIGEST_LEN]; /**< Stores KH for intermediate hops. */
time_t timestamp_created; /**< When was this circuit created? */
time_t timestamp_dirty; /**< When the circuit was first used, or 0 if the
* circuit is clean. */
uint8_t state; /**< Current status of this circuit. */
uint8_t purpose; /**< Why are we creating this circuit? */
/**
* The rend_query field holds y portion of y.onion (nul-terminated)
* if purpose is C_INTRODUCING or C_ESTABLISH_REND, or is a C_GENERAL
* for a hidden service, or is S_*.
*/
char rend_query[REND_SERVICE_ID_LEN+1];
/** The rend_pk_digest field holds a hash of location-hidden service's
* PK if purpose is INTRO_POINT or S_ESTABLISH_INTRO or S_RENDEZVOUSING.
*/
char rend_pk_digest[DIGEST_LEN];
/** Holds rendezvous cookie if purpose is REND_POINT_WAITING or
* C_ESTABLISH_REND. Filled with zeroes otherwise.
*/
char rend_cookie[REND_COOKIE_LEN];
/** Points to spliced circuit if purpose is REND_ESTABLISHED, and circuit
* is not marked for close. */
struct circuit_t *rend_splice;
/** 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;
struct circuit_t *next; /**< Next circuit in linked list. */
};
typedef struct circuit_t circuit_t;
#define ALLOW_UNVERIFIED_ENTRY 1
#define ALLOW_UNVERIFIED_EXIT 2
#define ALLOW_UNVERIFIED_MIDDLE 4
#define ALLOW_UNVERIFIED_RENDEZVOUS 8
#define ALLOW_UNVERIFIED_INTRODUCTION 16
typedef struct exit_redirect_t {
uint32_t addr;
uint32_t mask;
uint16_t port_min;
uint16_t port_max;
int is_redirect;
uint32_t addr_dest;
uint16_t port_dest;
} exit_redirect_t;
typedef struct config_line_t {
char *key;
char *value;
struct config_line_t *next;
} config_line_t;
/** 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 *OldLogOptions; /**< List of configuration lines
* for logfiles, old style. */
config_line_t *Logs; /**< New-style list of configuration lines
* for logs */
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. */
char *ExitNodes; /**< Comma-separated list of nicknames of ORs to consider
* as exits. */
char *EntryNodes; /**< Comma-separated list of nicknames of ORs to consider
* as entry points. */
int StrictExitNodes; /**< Boolean: When none of our ExitNodes are up, do we
* stop building circuits? */
int StrictEntryNodes; /**< Boolean: When none of our EntryNodes are up, do we
* stop building circuits? */
char *ExcludeNodes; /**< Comma-separated list of nicknames of ORs not to
* use in circuits. */
char *RendNodes; /**< Comma-separated list of nicknames used as introduction
* points. */
char *RendExcludeNodes; /**< Comma-separated list of nicknames not to use
* as introduction points. */
smartlist_t *AllowUnverifiedNodes; /**< List of "entry", "middle", "exit" */
int _AllowUnverified; /**< Bitmask; derived from AllowUnverifiedNodes; */
config_line_t *ExitPolicy; /**< Lists of exit policy components. */
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 *SocksBindAddress;
/** Addresses to bind for listening for OR connections. */
config_line_t *ORBindAddress;
/** Addresses to bind for listening for directory connections. */
config_line_t *DirBindAddress;
/** Local address to bind outbound sockets */
char *OutboundBindAddress;
/** 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 refuse router descriptors with private IPs. */
int DirAllowPrivateAddresses;
char *User; /**< Name of user to run Tor as. */
char *Group; /**< Name of group to run Tor as. */
double PathlenCoinWeight; /**< Parameter used to configure average path
* length (alpha in geometric distribution). */
int ORPort; /**< Port to listen on for OR connections. */
int SocksPort; /**< Port to listen on for SOCKS connections. */
int ControlPort; /**< Port to listen on for control connections. */
int DirPort; /**< Port to listen on for directory connections. */
int AssumeReachable; /**< Whether to publish our descriptor regardless. */
int AuthoritativeDir; /**< Boolean: is this an authoritative directory? */
int V1AuthoritativeDir; /**< Boolean: is this an authoritative directory? */
int ClientOnly; /**< Boolean: should we never evolve into a server role? */
int NoPublish; /**< Boolean: should we never publish a descriptor? */
int ConnLimit; /**< Requested maximum number of simultaneous connections. */
int _ConnLimit; /**< Actual maximum number of simultaneous connections. */
int IgnoreVersion; /**< If true, run no matter what versions of Tor the
* directory recommends. */
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; /**< Which IP:ports our firewall allows
* (exit policy.) */
/** Application ports that require all nodes in circ to have sufficient uptime. */
smartlist_t *LongLivedPorts;
/** 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 DirFetchPeriod; /**< How often do we fetch new directories? */
int DirPostPeriod; /**< How often do we post our server descriptor to the
* authoritative directory servers? */
int RendPostPeriod; /**< How often do we post each rendezvous service
* descriptor? Remember to publish them independently. */
int StatusFetchPeriod; /**< How often do we fetch running-routers lists? */
int KeepalivePeriod; /**< How often do we send padding cells to keep
* connections alive? */
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? */
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. */
char *ContactInfo; /**< Contact info to be published in the directory */
char *HttpProxy; /**< hostname[:port] to use as http proxy, if any */
uint32_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 */
uint32_t HttpsProxyAddr; /**< Parsed IPv4 addr for https proxy, if any */
uint16_t HttpsProxyPort; /**< Parsed port for https proxy, if any */
char *HttpsProxyAuthenticator; /**< username:password string, if any */
config_line_t *DirServers; /**< List of configuration lines
* for directory servers. */
char *MyFamily; /**< Declared family for this OR. */
config_line_t *NodeFamilies; /**< List of config lines for
* node families */
config_line_t *RedirectExit; /**< List of config lines for simple
* addr/port redirection */
smartlist_t *RedirectExitList; /**< List of exit_redirect_t */
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." */
int _AccountingMaxKB; /**< How many KB do we allow per accounting
* interval before hibernation? 0 for "never
* hibernate." (Based on a deprecated option)*/
char *HashedControlPassword; /**< Base64-encoded hash of a password for
* the control system. */
int CookieAuthentication; /**< Boolean: do we enable cookie-based auth for
* the control system? */
int LeaveStreamsUnattached; /**< Boolean: Does Tor attach new streams to
* circuits itself (0), or does it expect a controller
* to cope? (1) */
int ShutdownWaitLength; /**< When we get a SIGINT and we're a server, how
* long do we wait before exiting? */
int SafeLogging; /**< Boolean: are we allowed to log sensitive strings
* such as addresses (0), or do we scrub them first (1)? */
int HardwareAccel; /**< Boolean: Should we enable OpenSSL hardware
* acceleration where available? */
int UseHelperNodes; /**< Boolean: Do we try to enter from a smallish number
* of fixed nodes? */
int NumHelperNodes; /**< How many helper nodes do we try to establish? */
int RephistTrackTime; /**< How many seconds do we keep rephist info? */
addr_policy_t *reachable_addr_policy; /**< Parsed from ReachableAddresses */
} or_options_t;
/** Persistent state for an onion router, as saved to disk. */
typedef struct {
uint32_t _magic;
int dirty;
/* XXXX These options aren't actually attached to anything yet. */
time_t LastWritten;
time_t AccountingIntervalStart;
uint64_t AccountingBytesReadInInterval;
uint64_t AccountingBytesWrittenInInterval;
int AccountingSecondsActive;
uint64_t AccountingExpectedUsage;
config_line_t *HelperNodes;
} or_state_t;
#define MAX_SOCKS_REPLY_LEN 1024
#define MAX_SOCKS_ADDR_LEN 256
#define SOCKS_COMMAND_CONNECT 0x01
#define SOCKS_COMMAND_RESOLVE 0xF0
/** State of a SOCKS request from a user to an OP */
struct socks_request_t {
char socks_version; /**< Which version of SOCKS did the client use? */
int command; /**< What has the user requested? One of CONNECT or RESOLVE. */
size_t replylen; /**< Length of <b>reply</b>. */
char 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.
*/
int has_finished; /**< Has the SOCKS handshake finished? */
char address[MAX_SOCKS_ADDR_LEN]; /**< What address did the client ask to connect to? */
uint16_t port; /**< What port did the client ask to connect to? */
};
/* all the function prototypes go here */
/********************************* buffers.c ***************************/
buf_t *buf_new(void);
buf_t *buf_new_with_capacity(size_t size);
void buf_free(buf_t *buf);
void buf_clear(buf_t *buf);
void buf_shrink(buf_t *buf);
size_t buf_datalen(const buf_t *buf);
size_t buf_capacity(const buf_t *buf);
const char *_buf_peek_raw_buffer(const buf_t *buf);
int read_to_buf(int s, size_t at_most, buf_t *buf, int *reached_eof);
int read_to_buf_tls(tor_tls *tls, size_t at_most, buf_t *buf);
int flush_buf(int s, buf_t *buf, size_t *buf_flushlen);
int flush_buf_tls(tor_tls *tls, buf_t *buf, size_t *buf_flushlen);
int write_to_buf(const char *string, size_t string_len, buf_t *buf);
int fetch_from_buf(char *string, size_t string_len, buf_t *buf);
int fetch_from_buf_http(buf_t *buf,
char **headers_out, size_t max_headerlen,
char **body_out, size_t *body_used, size_t max_bodylen);
int fetch_from_buf_socks(buf_t *buf, socks_request_t *req);
int fetch_from_buf_control0(buf_t *buf, uint32_t *len_out, uint16_t *type_out,
char **body_out, int check_for_v1);
int fetch_from_buf_line(buf_t *buf, char *data_out, size_t *data_len);
void assert_buf_ok(buf_t *buf);
/********************************* circuitbuild.c **********************/
char *circuit_list_path(circuit_t *circ, int verbose);
void circuit_log_path(int severity, circuit_t *circ);
void circuit_rep_hist_note_result(circuit_t *circ);
void circuit_dump_by_conn(connection_t *conn, int severity);
circuit_t *circuit_init(uint8_t purpose, int need_uptime,
int need_capacity, int internal);
circuit_t *circuit_establish_circuit(uint8_t purpose, extend_info_t *exit,
int need_uptime, int need_capacity, int internal);
int circuit_handle_first_hop(circuit_t *circ);
void circuit_n_conn_done(connection_t *or_conn, int status);
int circuit_send_next_onion_skin(circuit_t *circ);
void circuit_note_clock_jumped(int seconds_elapsed);
int circuit_extend(cell_t *cell, circuit_t *circ);
int circuit_init_cpath_crypto(crypt_path_t *cpath, char *key_data, int reverse);
int circuit_finish_handshake(circuit_t *circ, uint8_t cell_type, char *reply);
int circuit_truncated(circuit_t *circ, crypt_path_t *layer);
int onionskin_answer(circuit_t *circ, uint8_t cell_type, char *payload, char *keys);
int circuit_all_predicted_ports_handled(time_t now, int *need_uptime,
int *need_capacity);
int circuit_append_new_exit(circuit_t *circ, extend_info_t *info);
int circuit_extend_to_new_exit(circuit_t *circ, extend_info_t *info);
void onion_append_to_cpath(crypt_path_t **head_ptr, crypt_path_t *new_hop);
extend_info_t *extend_info_from_router(routerinfo_t *r);
extend_info_t *extend_info_dup(extend_info_t *info);
void extend_info_free(extend_info_t *info);
routerinfo_t *build_state_get_exit_router(cpath_build_state_t *state);
const char *build_state_get_exit_nickname(cpath_build_state_t *state);
void helper_node_set_status(const char *digest, int succeeded);
void helper_nodes_set_status_from_directory(void);
int helper_nodes_update_state(or_state_t *state);
int helper_nodes_parse_state(or_state_t *state, int set, const char **err);
int helper_nodes_getinfo_helper(const char *question, char **answer);
/********************************* circuitlist.c ***********************/
circuit_t * _circuit_get_global_list(void);
const char *circuit_state_to_string(int state);
enum which_conn_changed_t { P_CONN_CHANGED=1, N_CONN_CHANGED=0 };
void circuit_set_circid_orconn(circuit_t *circ, uint16_t id,
connection_t *conn,
enum which_conn_changed_t which);
void circuit_close_all_marked(void);
circuit_t *circuit_new(uint16_t p_circ_id, connection_t *p_conn);
circuit_t *circuit_get_by_circid_orconn(uint16_t circ_id, connection_t *conn);
circuit_t *circuit_get_by_edge_conn(connection_t *conn);
circuit_t *circuit_get_by_conn(connection_t *conn);
circuit_t *circuit_get_by_global_id(uint32_t id);
circuit_t *circuit_get_by_rend_query_and_purpose(const char *rend_query, uint8_t purpose);
circuit_t *circuit_get_next_by_pk_and_purpose(circuit_t *start,
const char *digest, uint8_t purpose);
circuit_t *circuit_get_rendezvous(const char *cookie);
circuit_t *circuit_get_clean_open(uint8_t purpose, int need_uptime,
int need_capacity, int internal);
void circuit_mark_all_unused_circs(void);
void _circuit_mark_for_close(circuit_t *circ, int line, const char *file);
#define circuit_mark_for_close(c) \
_circuit_mark_for_close((c), __LINE__, _SHORT_FILE_)
void assert_cpath_layer_ok(const crypt_path_t *cp);
void assert_circuit_ok(const circuit_t *c);
void circuit_free_all(void);
/********************************* circuituse.c ************************/
void circuit_expire_building(time_t now);
void circuit_remove_handled_ports(smartlist_t *needed_ports);
int circuit_stream_is_being_handled(connection_t *conn, uint16_t port, int min);
void circuit_build_needed_circs(time_t now);
void circuit_detach_stream(circuit_t *circ, connection_t *conn);
void circuit_about_to_close_connection(connection_t *conn);
void circuit_has_opened(circuit_t *circ);
void circuit_build_failed(circuit_t *circ);
circuit_t *circuit_launch_by_nickname(uint8_t purpose, const char *exit_nickname,
int need_uptime, int need_capacity, int is_internal);
circuit_t *circuit_launch_by_extend_info(uint8_t purpose,
extend_info_t *info,
int need_uptime, int need_capacity, int is_internal);
circuit_t *circuit_launch_by_router(uint8_t purpose, routerinfo_t *exit,
int need_uptime, int need_capacity, int is_internal);
void circuit_reset_failure_count(int timeout);
int connection_ap_handshake_attach_chosen_circuit(connection_t *conn,
circuit_t *circ);
int connection_ap_handshake_attach_circuit(connection_t *conn);
/********************************* command.c ***************************/
void command_process_cell(cell_t *cell, connection_t *conn);
extern unsigned long stats_n_padding_cells_processed;
extern unsigned long stats_n_create_cells_processed;
extern unsigned long stats_n_created_cells_processed;
extern unsigned long stats_n_relay_cells_processed;
extern unsigned long stats_n_destroy_cells_processed;
/********************************* config.c ***************************/
or_options_t *get_options(void);
int set_options(or_options_t *new_val);
void config_free_all(void);
const char *safe_str(const char *address);
int config_get_lines(char *string, config_line_t **result);
void config_free_lines(config_line_t *front);
int options_trial_assign(config_line_t *list, int use_defaults, int clear_first);
int resolve_my_address(or_options_t *options, uint32_t *addr,
char **hostname_out);
void options_init(or_options_t *options);
int options_init_from_torrc(int argc, char **argv);
int options_init_logs(or_options_t *options, int validate_only);
int config_parse_addr_policy(config_line_t *cfg,
addr_policy_t **dest,
int assume_action);
void options_append_default_exit_policy(addr_policy_t **policy);
void addr_policy_free(addr_policy_t *p);
int option_is_recognized(const char *key);
const char *option_get_canonical_name(const char *key);
config_line_t *option_get_assignment(or_options_t *options,
const char *key);
char *options_dump(or_options_t *options, int minimal);
int options_save_current(void);
const char *get_torrc_fname(void);
or_state_t *get_or_state(void);
int or_state_load(void);
int or_state_save(void);
int config_getinfo_helper(const char *question, char **answer);
int firewall_is_fascist(void);
int fascist_firewall_allows_address(uint32_t addr, uint16_t port);
/********************************* connection.c ***************************/
const char *conn_type_to_string(int type);
const char *conn_state_to_string(int type, int state);
connection_t *connection_new(int type);
void connection_unregister(connection_t *conn);
void connection_free(connection_t *conn);
void connection_free_all(void);
void connection_about_to_close_connection(connection_t *conn);
void connection_close_immediate(connection_t *conn);
void _connection_mark_for_close(connection_t *conn,int line, const char *file);
#define connection_mark_for_close(c) \
_connection_mark_for_close((c), __LINE__, _SHORT_FILE_)
void connection_expire_held_open(void);
int connection_connect(connection_t *conn, char *address, uint32_t addr, uint16_t port);
int retry_all_listeners(int force, smartlist_t *replaced_conns,
smartlist_t *new_conns);
void connection_bucket_init(void);
void connection_bucket_refill(struct timeval *now);
int connection_handle_read(connection_t *conn);
int connection_fetch_from_buf(char *string, size_t len, connection_t *conn);
int connection_wants_to_flush(connection_t *conn);
int connection_outbuf_too_full(connection_t *conn);
int connection_handle_write(connection_t *conn);
void _connection_controller_force_write(connection_t *conn);
void connection_write_to_buf(const char *string, size_t len, connection_t *conn);
connection_t *connection_or_exact_get_by_addr_port(uint32_t addr, uint16_t port);
connection_t *connection_get_by_identity_digest(const char *digest, int type);
connection_t *connection_get_by_global_id(uint32_t id);
connection_t *connection_get_by_type(int type);
connection_t *connection_get_by_type_purpose(int type, int purpose);
connection_t *connection_get_by_type_addr_port_purpose(int type, uint32_t addr,
uint16_t port, int purpose);
connection_t *connection_get_by_type_state(int type, int state);
connection_t *connection_get_by_type_state_lastwritten(int type, int state);
connection_t *connection_get_by_type_state_rendquery(int type, int state, const char *rendquery);
#define connection_speaks_cells(conn) ((conn)->type == CONN_TYPE_OR)
#define connection_has_pending_tls_data(conn) \
((conn)->type == CONN_TYPE_OR && \
(conn)->state == OR_CONN_STATE_OPEN && \
tor_tls_get_pending_bytes((conn)->tls))
int connection_is_listener(connection_t *conn);
int connection_state_is_open(connection_t *conn);
int connection_state_is_connecting(connection_t *conn);
int connection_send_destroy(uint16_t circ_id, connection_t *conn);
char *alloc_http_authenticator(const char *authenticator);
void assert_connection_ok(connection_t *conn, time_t now);
int connection_or_nonopen_was_started_here(connection_t *conn);
/********************************* connection_edge.c ***************************/
#define connection_mark_unattached_ap(conn, endreason) \
_connection_mark_unattached_ap((conn), (endreason), __LINE__, _SHORT_FILE_)
void _connection_mark_unattached_ap(connection_t *conn, int endreason,
int line, const char *file);
int connection_edge_reached_eof(connection_t *conn);
int connection_edge_process_inbuf(connection_t *conn, int package_partial);
int connection_edge_destroy(uint16_t circ_id, connection_t *conn);
int connection_edge_end(connection_t *conn, char reason, crypt_path_t *cpath_layer);
int connection_edge_end_errno(connection_t *conn, crypt_path_t *cpath_layer);
int connection_edge_finished_flushing(connection_t *conn);
int connection_edge_finished_connecting(connection_t *conn);
int connection_ap_handshake_send_begin(connection_t *ap_conn, circuit_t *circ);
int connection_ap_handshake_send_resolve(connection_t *ap_conn, circuit_t *circ);
int connection_ap_make_bridge(char *address, uint16_t port);
void connection_ap_handshake_socks_reply(connection_t *conn, char *reply,
size_t replylen,
socks5_reply_status_t status);
void connection_ap_handshake_socks_resolved(connection_t *conn,
int answer_type,
size_t answer_len,
const char *answer,
int ttl);
int connection_exit_begin_conn(cell_t *cell, circuit_t *circ);
int connection_exit_begin_resolve(cell_t *cell, circuit_t *circ);
void connection_exit_connect(connection_t *conn);
int connection_edge_is_rendezvous_stream(connection_t *conn);
int connection_ap_can_use_exit(connection_t *conn, routerinfo_t *exit);
void connection_ap_expire_beginning(void);
void connection_ap_attach_pending(void);
int connection_ap_detach_retriable(connection_t *conn, circuit_t *circ);
void addressmap_init(void);
void addressmap_clean(time_t now);
void addressmap_clear_configured(void);
void addressmap_clear_transient(void);
void addressmap_free_all(void);
void addressmap_rewrite(char *address, size_t maxlen);
int addressmap_already_mapped(const char *address);
void addressmap_register(const char *address, char *new_address, time_t expires);
int client_dns_incr_failures(const char *address);
void client_dns_clear_failures(const char *address);
void client_dns_set_addressmap(const char *address, uint32_t val, const char *exitname, int ttl);
const char *addressmap_register_virtual_address(int type, char *new_address);
void addressmap_get_mappings(smartlist_t *sl, time_t min_expires, time_t max_expires);
void parse_socks_policy(void);
void free_socks_policy(void);
int socks_policy_permits_address(uint32_t addr);
void set_exit_redirects(smartlist_t *lst);
typedef enum hostname_type_t {
NORMAL_HOSTNAME, ONION_HOSTNAME, EXIT_HOSTNAME, BAD_HOSTNAME
} hostname_type_t;
hostname_type_t parse_extended_hostname(char *address);
/********************************* connection_or.c ***************************/
int connection_or_reached_eof(connection_t *conn);
int connection_or_process_inbuf(connection_t *conn);
int connection_or_finished_flushing(connection_t *conn);
int connection_or_finished_connecting(connection_t *conn);
connection_t *connection_or_connect(uint32_t addr, uint16_t port,
const char *id_digest);
int connection_tls_start_handshake(connection_t *conn, int receiving);
int connection_tls_continue_handshake(connection_t *conn);
void connection_or_write_cell_to_buf(const cell_t *cell, connection_t *conn);
void connection_or_update_nickname(connection_t *conn);
/********************************* control.c ***************************/
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;
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_status_event_t;
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_status_event_t;
void control_update_global_event_mask(void);
void control_adjust_event_log_severity(void);
void disable_control_logging(void);
void enable_control_logging(void);
#define CONN_LOG_PROTECT(conn, stmt) \
do { \
int _log_conn_is_control = (conn && conn->type == CONN_TYPE_CONTROL); \
if (_log_conn_is_control) \
disable_control_logging(); \
do {stmt;} while (0); \
if (_log_conn_is_control) \
enable_control_logging(); \
} while (0)
#define LOG_FN_CONN(conn, args) \
CONN_LOG_PROTECT(conn, log_fn args)
int connection_control_finished_flushing(connection_t *conn);
int connection_control_reached_eof(connection_t *conn);
int connection_control_process_inbuf(connection_t *conn);
int control_event_circuit_status(circuit_t *circ, circuit_status_event_t e);
int control_event_stream_status(connection_t *conn, stream_status_event_t e);
int control_event_or_conn_status(connection_t *conn, or_conn_status_event_t e);
int control_event_bandwidth_used(uint32_t n_read, uint32_t n_written);
void control_event_logmsg(int severity, const char *msg);
int control_event_descriptors_changed(smartlist_t *routers);
int control_event_address_mapped(const char *from, const char *to,time_t expires);
int init_cookie_authentication(int enabled);
int decode_hashed_password(char *buf, const char *hashed);
/********************************* cpuworker.c *****************************/
void cpu_init(void);
void cpuworkers_rotate(void);
int connection_cpu_finished_flushing(connection_t *conn);
int connection_cpu_reached_eof(connection_t *conn);
int connection_cpu_process_inbuf(connection_t *conn);
int assign_to_cpuworker(connection_t *cpuworker, uint8_t question_type,
void *task);
/********************************* directory.c ***************************/
int dir_policy_permits_address(uint32_t addr);
void directory_post_to_dirservers(uint8_t purpose, const char *payload,
size_t payload_len);
void directory_get_from_dirserver(uint8_t purpose, const char *resource,
int retry_if_no_servers);
void directory_initiate_command_router(routerinfo_t *router, uint8_t purpose,
int private_connection, const char *resource,
const char *payload, size_t payload_len);
int parse_http_response(const char *headers, int *code, time_t *date,
int *compression, char **response);
int connection_dir_reached_eof(connection_t *conn);
int connection_dir_process_inbuf(connection_t *conn);
int connection_dir_finished_flushing(connection_t *conn);
int connection_dir_finished_connecting(connection_t *conn);
void connection_dir_request_failed(connection_t *conn);
void parse_dir_policy(void);
void free_dir_policy(void);
/********************************* dirserv.c ***************************/
int dirserv_add_own_fingerprint(const char *nickname, crypto_pk_env_t *pk);
int dirserv_parse_fingerprint_file(const char *fname);
int dirserv_router_fingerprint_is_known(const routerinfo_t *router);
void dirserv_free_fingerprint_list(void);
const char *dirserv_get_nickname_by_digest(const char *digest);
int dirserv_add_descriptor(const char *desc, const char **msg);
char *dirserver_getinfo_unregistered(const char *question);
void dirserv_free_descriptors(void);
int dirserv_thinks_router_is_blatantly_unreachable(routerinfo_t *router,
time_t now);
int list_server_status(smartlist_t *routers, char **router_status_out);
int dirserv_dump_directory_to_string(char **dir_out,
crypto_pk_env_t *private_key);
void directory_set_dirty(void);
size_t dirserv_get_directory(const char **cp, int compress);
size_t dirserv_get_runningrouters(const char **rr, int compress);
void dirserv_set_cached_directory(const char *directory, time_t when,
int is_running_routers);
void dirserv_set_cached_networkstatus_v2(const char *directory, const char *fp,
time_t published);
int dirserv_get_networkstatus_v2(smartlist_t *result, const char *key);
void dirserv_get_routerdescs(smartlist_t *descs_out, const char *key);
void dirserv_orconn_tls_done(const char *address,
uint16_t or_port,
const char *digest_rcvd,
const char *nickname,
int as_advertised);
int dirserv_wants_to_reject_router(routerinfo_t *ri, int *verified,
const char **msg);
void dirserv_free_all(void);
/********************************* dns.c ***************************/
void dns_init(void);
void dns_free_all(void);
int connection_dns_finished_flushing(connection_t *conn);
int connection_dns_reached_eof(connection_t *conn);
int connection_dns_process_inbuf(connection_t *conn);
void dnsworkers_rotate(void);
void connection_dns_remove(connection_t *conn);
void assert_connection_edge_not_dns_pending(connection_t *conn);
void assert_all_pending_dns_resolves_ok(void);
void dns_cancel_pending_resolve(char *question);
int dns_resolve(connection_t *exitconn);
/********************************* hibernate.c **********************/
int accounting_parse_options(or_options_t *options, int validate_only);
int accounting_is_enabled(or_options_t *options);
void configure_accounting(time_t now);
void accounting_run_housekeeping(time_t now);
void accounting_add_bytes(size_t n_read, size_t n_written, int seconds);
int accounting_record_bandwidth_usage(time_t now);
void hibernate_begin_shutdown(void);
int we_are_hibernating(void);
void consider_hibernation(time_t now);
int accounting_getinfo_helper(const char *question, char **answer);
void accounting_set_bandwidth_usage_from_state(or_state_t *state);
/********************************* main.c ***************************/
int connection_add(connection_t *conn);
int connection_remove(connection_t *conn);
int connection_in_array(connection_t *conn);
void add_connection_to_closeable_list(connection_t *conn);
int connection_is_on_closeable_list(connection_t *conn);
void get_connection_array(connection_t ***array, int *n);
void connection_watch_events(connection_t *conn, short events);
int connection_is_reading(connection_t *conn);
void connection_stop_reading(connection_t *conn);
void connection_start_reading(connection_t *conn);
int connection_is_writing(connection_t *conn);
void connection_stop_writing(connection_t *conn);
void connection_start_writing(connection_t *conn);
void directory_all_unreachable(time_t now);
void directory_has_arrived(time_t now, char *identity_digest);
int control_signal_act(int the_signal);
void handle_signals(int is_parent);
void tor_cleanup(void);
void tor_free_all(int postfork);
int tor_main(int argc, char *argv[]);
/********************************* onion.c ***************************/
int onion_pending_add(circuit_t *circ);
circuit_t *onion_next_task(void);
void onion_pending_remove(circuit_t *circ);
int onion_skin_create(crypto_pk_env_t *router_key,
crypto_dh_env_t **handshake_state_out,
char *onion_skin_out);
int onion_skin_server_handshake(const char *onion_skin,
crypto_pk_env_t *private_key,
crypto_pk_env_t *prev_private_key,
char *handshake_reply_out,
char *key_out,
size_t key_out_len);
int onion_skin_client_handshake(crypto_dh_env_t *handshake_state,
const char *handshake_reply,
char *key_out,
size_t key_out_len);
int fast_server_handshake(const char *key_in,
char *handshake_reply_out,
char *key_out,
size_t key_out_len);
int fast_client_handshake(const char *handshake_state,
const char *handshake_reply_out,
char *key_out,
size_t key_out_len);
void clear_pending_onions(void);
/********************************* relay.c ***************************/
extern unsigned long stats_n_relay_cells_relayed;
extern unsigned long stats_n_relay_cells_delivered;
int circuit_receive_relay_cell(cell_t *cell, circuit_t *circ,
int cell_direction);
void relay_header_pack(char *dest, const relay_header_t *src);
void relay_header_unpack(relay_header_t *dest, const char *src);
int connection_edge_send_command(connection_t *fromconn, circuit_t *circ,
int relay_command, const char *payload,
size_t payload_len, crypt_path_t *cpath_layer);
int connection_edge_package_raw_inbuf(connection_t *conn, int package_partial);
void connection_edge_consider_sending_sendme(connection_t *conn);
socks5_reply_status_t connection_edge_end_reason_socks5_response(int reason);
int errno_to_end_reason(int e);
extern uint64_t stats_n_data_cells_packaged;
extern uint64_t stats_n_data_bytes_packaged;
extern uint64_t stats_n_data_cells_received;
extern uint64_t stats_n_data_bytes_received;
/********************************* rephist.c ***************************/
void rep_hist_init(void);
void rep_hist_note_connect_failed(const char* nickname, time_t when);
void rep_hist_note_connect_succeeded(const char* nickname, time_t when);
void rep_hist_note_disconnect(const char* nickname, time_t when);
void rep_hist_note_connection_died(const char* nickname, time_t when);
void rep_hist_note_extend_succeeded(const char *from_name,
const char *to_name);
void rep_hist_note_extend_failed(const char *from_name, const char *to_name);
void rep_hist_dump_stats(time_t now, int severity);
void rep_hist_note_bytes_read(int num_bytes, time_t when);
void rep_hist_note_bytes_written(int num_bytes, time_t when);
int rep_hist_bandwidth_assess(void);
char *rep_hist_get_bandwidth_lines(void);
void rep_history_clean(time_t before);
void rep_hist_note_used_port(uint16_t port, time_t now);
smartlist_t *rep_hist_get_predicted_ports(time_t now);
void rep_hist_note_used_hidserv(time_t now, int need_uptime, int need_capacity);
int rep_hist_get_predicted_hidserv(time_t now, int *need_uptime, int *need_capacity);
void rep_hist_note_used_resolve(time_t now);
int rep_hist_get_predicted_resolve(time_t now);
void rep_hist_free_all(void);
/********************************* rendclient.c ***************************/
void rend_client_introcirc_has_opened(circuit_t *circ);
void rend_client_rendcirc_has_opened(circuit_t *circ);
int rend_client_introduction_acked(circuit_t *circ, const char *request, size_t request_len);
void rend_client_refetch_renddesc(const char *query);
int rend_client_remove_intro_point(extend_info_t *failed_intro, const char *query);
int rend_client_rendezvous_acked(circuit_t *circ, const char *request, size_t request_len);
int rend_client_receive_rendezvous(circuit_t *circ, const char *request, size_t request_len);
void rend_client_desc_here(const char *query);
extend_info_t *rend_client_get_random_intro(const char *query);
int rend_client_send_introduction(circuit_t *introcirc, circuit_t *rendcirc);
/********************************* rendcommon.c ***************************/
/** Information used to connect to a hidden service. */
typedef struct rend_service_descriptor_t {
crypto_pk_env_t *pk; /**< This service's public key. */
int version; /**< 0 or 1. */
time_t timestamp; /**< Time when the descriptor was generated. */
uint16_t protocols; /**< Bitmask: which rendezvous protocols are supported?
* (We allow bits '0', '1', and '2' to be set.) */
int n_intro_points; /**< Number of introduction points. */
/** Array of n_intro_points elements for this service's introduction points'
* nicknames. Elements are removed from this array if introduction attempts
* fail. */
char **intro_points;
/** Array of n_intro_points elements for this service's introduction points'
* extend_infos, or NULL if this descriptor is V0. Elements are removed
* from this array if introduction attempts fail. If this array is present,
* its elements correspond to the elements of intro_points. */
extend_info_t **intro_point_extend_info;
} rend_service_descriptor_t;
int rend_cmp_service_ids(const char *one, const char *two);
void rend_process_relay_cell(circuit_t *circ, int command, size_t length,
const char *payload);
void rend_service_descriptor_free(rend_service_descriptor_t *desc);
int rend_encode_service_descriptor(rend_service_descriptor_t *desc,
int version,
crypto_pk_env_t *key,
char **str_out,
size_t *len_out);
rend_service_descriptor_t *rend_parse_service_descriptor(const char *str, size_t len);
int rend_get_service_id(crypto_pk_env_t *pk, char *out);
typedef struct rend_cache_entry_t {
size_t len; /* Length of desc */
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;
void rend_cache_init(void);
void rend_cache_clean(void);
void rend_cache_free_all(void);
int rend_valid_service_id(const char *query);
int rend_cache_lookup_desc(const char *query, int version, const char **desc, size_t *desc_len);
int rend_cache_lookup_entry(const char *query, int version, rend_cache_entry_t **entry_out);
int rend_cache_store(const char *desc, size_t desc_len);
/********************************* rendservice.c ***************************/
int num_rend_services(void);
int rend_config_services(or_options_t *options, int validate_only);
int rend_service_load_keys(void);
void rend_services_init(void);
void rend_services_introduce(void);
void rend_consider_services_upload(time_t now);
void rend_service_intro_has_opened(circuit_t *circuit);
int rend_service_intro_established(circuit_t *circuit, const char *request, size_t request_len);
void rend_service_rendezvous_has_opened(circuit_t *circuit);
int rend_service_introduce(circuit_t *circuit, const char *request, size_t request_len);
void rend_service_relaunch_rendezvous(circuit_t *oldcirc);
int rend_service_set_connection_addr_port(connection_t *conn, circuit_t *circ);
void rend_service_dump_stats(int severity);
void rend_service_free_all(void);
/********************************* rendmid.c *******************************/
int rend_mid_establish_intro(circuit_t *circ, const char *request, size_t request_len);
int rend_mid_introduce(circuit_t *circ, const char *request, size_t request_len);
int rend_mid_establish_rendezvous(circuit_t *circ, const char *request, size_t request_len);
int rend_mid_rendezvous(circuit_t *circ, const char *request, size_t request_len);
/********************************* router.c ***************************/
typedef enum {
ADDR_POLICY_ACCEPTED=0,
ADDR_POLICY_REJECTED=-1,
ADDR_POLICY_PROBABLY_ACCEPTED=1,
ADDR_POLICY_PROBABLY_REJECTED=2
} addr_policy_result_t;
void set_onion_key(crypto_pk_env_t *k);
crypto_pk_env_t *get_onion_key(void);
crypto_pk_env_t *get_previous_onion_key(void);
time_t get_onion_key_set_at(void);
void set_identity_key(crypto_pk_env_t *k);
crypto_pk_env_t *get_identity_key(void);
int identity_key_is_set(void);
void dup_onion_keys(crypto_pk_env_t **key, crypto_pk_env_t **last);
void rotate_onion_key(void);
crypto_pk_env_t *init_key_from_file(const char *fname);
int init_keys(void);
int check_whether_orport_reachable(void);
int check_whether_dirport_reachable(void);
void consider_testing_reachability(void);
void router_orport_found_reachable(void);
void router_dirport_found_reachable(void);
void server_has_changed_ip(void);
void consider_publishable_server(time_t now, int force);
int authdir_mode(or_options_t *options);
int clique_mode(or_options_t *options);
int server_mode(or_options_t *options);
int advertised_server_mode(void);
int proxy_mode(or_options_t *options);
void router_retry_connections(int force);
int router_is_clique_mode(routerinfo_t *router);
void router_upload_dir_desc_to_dirservers(int force);
void mark_my_descriptor_dirty_if_older_than(time_t when);
void mark_my_descriptor_dirty(void);
void check_descriptor_bandwidth_changed(time_t now);
int router_compare_to_my_exit_policy(connection_t *conn);
routerinfo_t *router_get_my_routerinfo(void);
const char *router_get_my_descriptor(void);
int router_digest_is_me(const char *digest);
int router_is_me(routerinfo_t *router);
int router_fingerprint_is_me(const char *fp);
int router_rebuild_descriptor(int force);
int router_dump_router_to_string(char *s, size_t maxlen, routerinfo_t *router,
crypto_pk_env_t *ident_key);
int is_legal_nickname(const char *s);
int is_legal_nickname_or_hexdigest(const char *s);
void router_free_all_keys(void);
/********************************* routerlist.c ***************************/
/** Represents information about a single trusted directory server. */
typedef struct trusted_dir_server_t {
char *address; /**< Hostname */
uint32_t addr; /**< IPv4 address */
uint16_t dir_port; /**< Directory port */
char digest[DIGEST_LEN]; /**< Digest of identity key */
unsigned int is_running:1; /**< True iff we think this server is running. */
unsigned int supports_v1_protocol:1; /**< True iff this server is an
* authority for the older ("v1")
* directory protocol.*/
int n_networkstatus_failures; /**< How many times have we asked for this
* server's network-status unsuccessfully? */
} trusted_dir_server_t;
int router_reload_router_list(void);
int router_reload_networkstatus(void);
void router_get_trusted_dir_servers(smartlist_t **outp);
routerinfo_t *router_pick_directory_server(int requireother,
int fascistfirewall,
int for_v2_directory,
int retry_if_no_servers);
trusted_dir_server_t *router_pick_trusteddirserver(int need_v1_support,
int requireother,
int fascistfirewall,
int retry_if_no_servers);
trusted_dir_server_t *router_get_trusteddirserver_by_digest(
const char *digest);
int all_trusted_directory_servers_down(void);
void routerlist_add_family(smartlist_t *sl, routerinfo_t *router);
void add_nickname_list_to_smartlist(smartlist_t *sl, const char *list, int warn_if_down);
routerinfo_t *routerlist_find_my_routerinfo(void);
int exit_policy_implicitly_allows_local_networks(addr_policy_t *policy,
int warn);
/** How many seconds a router must be up before we'll use it for
* reliability-critical node positions.
*/
#define ROUTER_REQUIRED_MIN_UPTIME (24*3600) /* a day */
#define ROUTER_REQUIRED_MIN_BANDWIDTH 10000
routerinfo_t *router_find_exact_exit_enclave(const char *address, uint16_t port);
int router_is_unreliable(routerinfo_t *router, int need_uptime, int need_capacity);
routerinfo_t *routerlist_sl_choose_by_bandwidth(smartlist_t *sl);
routerinfo_t *router_choose_random_node(const char *preferred,
const char *excluded,
smartlist_t *excludedsmartlist,
int need_uptime, int need_bandwidth,
int allow_unverified, int strict);
routerinfo_t *router_get_by_nickname(const char *nickname);
routerinfo_t *router_get_by_hexdigest(const char *hexdigest);
routerinfo_t *router_get_by_digest(const char *digest);
int router_digest_is_trusted_dir(const char *digest);
void router_get_routerlist(routerlist_t **prouterlist);
#if 0
time_t routerlist_get_published_time(void);
#endif
void routerlist_free(routerlist_t *routerlist);
void routerinfo_free(routerinfo_t *router);
void routerstatus_free(routerstatus_t *routerstatus);
void networkstatus_free(networkstatus_t *networkstatus);
void routerlist_free_all(void);
routerinfo_t *routerinfo_copy(const routerinfo_t *router);
void router_mark_as_down(const char *digest);
void routerlist_remove_old_routers(int age);
int router_add_to_routerlist(routerinfo_t *router, const char **msg);
int router_load_single_router(const char *s, const char **msg);
int router_load_routerlist_from_directory(const char *s,crypto_pk_env_t *pkey,
int dir_is_recent, int dir_is_cached);
typedef enum { NS_FROM_CACHE, NS_FROM_DIR, NS_GENERATED} networkstatus_source_t;
int router_set_networkstatus(const char *s, time_t arrived_at,
networkstatus_source_t source,
smartlist_t *requested_fingerprints);
addr_policy_result_t router_compare_addr_to_addr_policy(uint32_t addr,
uint16_t port, addr_policy_t *policy);
int router_exit_policy_all_routers_reject(uint32_t addr, uint16_t port,
int need_uptime);
int router_exit_policy_rejects_all(routerinfo_t *router);
#if 0
void running_routers_free(running_routers_t *rr);
void routerlist_set_runningrouters(routerlist_t *list, running_routers_t *rr);
int routers_update_status_from_entry(smartlist_t *routers,
time_t list_time,
const char *s);
int router_update_status_from_smartlist(routerinfo_t *r,
time_t list_time,
smartlist_t *running_list);
#endif
void add_trusted_dir_server(const char *addr, uint16_t port,
const char *digest, int supports_v1);
void clear_trusted_dir_servers(void);
networkstatus_t *networkstatus_get_by_digest(const char *digest);
void update_networkstatus_cache_downloads(time_t now);
void update_networkstatus_client_downloads(time_t now);
void routers_update_all_from_networkstatus(void);
void routers_update_status_from_networkstatus(smartlist_t *routers);
smartlist_t *router_list_superseded(void);
/********************************* 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;
/** CVS status. For version in the post-0.1 format, this is always
* IS_NOT_CVS */
enum { IS_CVS=0, IS_NOT_CVS=1} cvs;
char status_tag[MAX_STATUS_TAG_LEN];
} tor_version_t;
int router_get_router_hash(const char *s, char *digest);
int router_get_dir_hash(const char *s, char *digest);
int router_get_runningrouters_hash(const char *s, char *digest);
int router_get_networkstatus_v2_hash(const char *s, char *digest);
int router_append_dirobj_signature(char *buf, size_t buf_len, const char *digest,
crypto_pk_env_t *private_key);
int router_parse_list_from_string(const char **s,
smartlist_t *dest,
time_t published);
int router_parse_routerlist_from_directory(const char *s,
routerlist_t **dest,
crypto_pk_env_t *pkey,
int check_version,
int write_to_cache);
int router_parse_runningrouters(const char *str);
routerinfo_t *router_parse_entry_from_string(const char *s, const char *end);
int router_add_exit_policy_from_string(routerinfo_t *router, const char *s);
addr_policy_t *router_parse_addr_policy_from_string(const char *s,
int assume_action);
int check_software_version_against_directory(const char *directory);
int tor_version_parse(const char *s, tor_version_t *out);
int tor_version_as_new_as(const char *platform, const char *cutoff);
int tor_version_compare(tor_version_t *a, tor_version_t *b);
void assert_addr_policy_ok(addr_policy_t *t);
networkstatus_t *networkstatus_parse_from_string(const char *s);
#endif
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