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tor/src/or/or.h

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/* Copyright 2001,2002,2003 Roger Dingledine, Matej Pfajfar. */
/* See LICENSE for licensing information */
/* $Id$ */
#ifndef __OR_H
#define __OR_H
#include "orconfig.h"
#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_SYS_POLL_H
#include <sys/poll.h>
#elif HAVE_POLL_H
#include <poll.h>
#else
#include "../common/fakepoll.h"
#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
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#ifdef HAVE_WINSOCK_H
#include <winsock.h>
#endif
#if _MSC_VER > 1300
#include <winsock2.h>
#include <ws2tcpip.h>
#elif defined(_MSC_VER)
#include <winsock.h>
#endif
#ifdef MS_WINDOWS
#include <io.h>
#include <process.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#define snprintf _snprintf
#endif
#include "../common/crypto.h"
#include "../common/tortls.h"
#include "../common/log.h"
#include "../common/util.h"
#define MAXCONNECTIONS 1000 /* upper bound on max connections.
can be lowered by config file */
#define DEFAULT_BANDWIDTH_OP (1024 * 1000)
#define MAX_NICKNAME_LEN 32
#define MAX_DIR_SIZE 500000
#ifdef TOR_PERF
#define MAX_DNS_ENTRY_AGE (150*60)
#else
#define MAX_DNS_ENTRY_AGE (15*60)
#endif
#define CIRC_ID_TYPE_LOWER 0
#define CIRC_ID_TYPE_HIGHER 1
#define _CONN_TYPE_MIN 3
#define CONN_TYPE_OR_LISTENER 3
#define CONN_TYPE_OR 4
#define CONN_TYPE_EXIT 5
#define CONN_TYPE_AP_LISTENER 6
#define CONN_TYPE_AP 7
#define CONN_TYPE_DIR_LISTENER 8
#define CONN_TYPE_DIR 9
#define CONN_TYPE_DNSWORKER 10
#define CONN_TYPE_CPUWORKER 11
#define _CONN_TYPE_MAX 11
#define LISTENER_STATE_READY 0
#define _DNSWORKER_STATE_MIN 1
#define DNSWORKER_STATE_IDLE 1
#define DNSWORKER_STATE_BUSY 2
#define _DNSWORKER_STATE_MAX 2
#define _CPUWORKER_STATE_MIN 1
#define CPUWORKER_STATE_IDLE 1
#define CPUWORKER_STATE_BUSY_ONION 2
#define CPUWORKER_STATE_BUSY_HANDSHAKE 3
#define _CPUWORKER_STATE_MAX 3
#define CPUWORKER_TASK_ONION CPUWORKER_STATE_BUSY_ONION
#define _OR_CONN_STATE_MIN 1
#define OR_CONN_STATE_CONNECTING 1 /* waiting for connect() to finish */
#define OR_CONN_STATE_HANDSHAKING 2 /* SSL is handshaking, not done yet */
#define OR_CONN_STATE_OPEN 3 /* ready to send/receive cells. */
#define _OR_CONN_STATE_MAX 3
#define _EXIT_CONN_STATE_MIN 1
#define EXIT_CONN_STATE_RESOLVING 1 /* waiting for response from dns farm */
#define EXIT_CONN_STATE_CONNECTING 2 /* waiting for connect() to finish */
#define EXIT_CONN_STATE_OPEN 3
#define _EXIT_CONN_STATE_MAX 3
#if 0
#define EXIT_CONN_STATE_CLOSE 3 /* flushing the buffer, then will close */
#define EXIT_CONN_STATE_CLOSE_WAIT 4 /* have sent a destroy, awaiting a confirmation */
#endif
/* the AP state values must be disjoint from the EXIT state values */
#define _AP_CONN_STATE_MIN 4
#define AP_CONN_STATE_SOCKS_WAIT 4
#define AP_CONN_STATE_CIRCUIT_WAIT 5
#define AP_CONN_STATE_CONNECTING 6
#define AP_CONN_STATE_OPEN 7
#define _AP_CONN_STATE_MAX 7
#define _DIR_CONN_STATE_MIN 1
#define DIR_CONN_STATE_CONNECTING_FETCH 1
#define DIR_CONN_STATE_CONNECTING_UPLOAD 2
#define DIR_CONN_STATE_CLIENT_SENDING_FETCH 3
#define DIR_CONN_STATE_CLIENT_SENDING_UPLOAD 4
#define DIR_CONN_STATE_CLIENT_READING_FETCH 5
#define DIR_CONN_STATE_CLIENT_READING_UPLOAD 6
#define DIR_CONN_STATE_SERVER_COMMAND_WAIT 7
#define DIR_CONN_STATE_SERVER_WRITING 8
#define _DIR_CONN_STATE_MAX 8
#define CIRCUIT_STATE_BUILDING 0 /* I'm the OP, still haven't done all my handshakes */
#define CIRCUIT_STATE_ONIONSKIN_PENDING 1 /* waiting to process the onionskin */
#define CIRCUIT_STATE_OR_WAIT 2 /* I'm the OP, my firsthop is still connecting */
#define CIRCUIT_STATE_OPEN 3 /* onionskin(s) processed, ready to send/receive cells */
#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 END_STREAM_REASON_MISC 1
#define END_STREAM_REASON_RESOLVEFAILED 2
#define END_STREAM_REASON_CONNECTFAILED 3
#define END_STREAM_REASON_EXITPOLICY 4
#define END_STREAM_REASON_DESTROY 5
#define END_STREAM_REASON_DONE 6
/* default cipher function */
#define DEFAULT_CIPHER CRYPTO_CIPHER_AES_CTR
/* Used to en/decrypt onion skins */
#define ONION_CIPHER DEFAULT_CIPHER
/* Used to en/decrypt RELAY cells */
#define CIRCUIT_CIPHER DEFAULT_CIPHER
#define CELL_DIRECTION_IN 1
#define CELL_DIRECTION_OUT 2
#define EDGE_EXIT CONN_TYPE_EXIT
#define EDGE_AP CONN_TYPE_AP
#define CELL_DIRECTION(x) ((x) == EDGE_EXIT ? CELL_DIRECTION_IN : CELL_DIRECTION_OUT)
#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
/* legal characters in a filename */
#define CONFIG_LEGAL_FILENAME_CHARACTERS "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-_/"
/* legal characters in a nickname */
#define LEGAL_NICKNAME_CHARACTERS "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
#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]
*/
#if 0
#define CELL_RELAY_COMMAND(c) (*(uint8_t*)((c).payload))
#define SET_CELL_RELAY_COMMAND(c,cmd) (*(uint8_t*)((c).payload) = (cmd))
#define CELL_RELAY_RECOGNIZED(c) (ntohs(*(uint16_t*)((c).payload+1)))
#define SET_CELL_RELAY_RECOGNIZED(c,r) (*(uint16_t*)((c).payload+1) = htons(r))
#define STREAM_ID_SIZE 2
//#define SET_CELL_STREAM_ID(c,id) memcpy((c).payload+1,(id),STREAM_ID_SIZE)
#define CELL_RELAY_STREAM_ID(c) (ntohs(*(uint16_t*)((c).payload+3)))
#define SET_CELL_RELAY_STREAM_ID(c,id) (*(uint16_t*)((c).payload+3) = htons(id))
#define ZERO_STREAM 0
/* integrity is the first 32 bits (in network order) of a sha-1 of all
* cell payloads that are relay cells that have been sent / delivered
* to the hop on the * circuit (the integrity is zeroed while doing
* each calculation)
*/
#define CELL_RELAY_INTEGRITY(c) (ntohl(*(uint32_t*)((c).payload+5)))
#define SET_CELL_RELAY_INTEGRITY(c,i) (*(uint32_t*)((c).payload+5) = htonl(i))
/* relay length is how many bytes are used in the cell payload past relay_header_size */
#define CELL_RELAY_LENGTH(c) (ntohs(*(uint16_t*)((c).payload+9)))
#define SET_CELL_RELAY_LENGTH(c,len) (*(uint16_t*)((c).payload+9) = htons(len))
#endif
#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)
/* cell definition */
typedef struct {
uint16_t circ_id;
unsigned char command;
unsigned char payload[CELL_PAYLOAD_SIZE];
} cell_t;
typedef struct {
uint8_t command;
uint16_t recognized;
uint16_t stream_id;
char integrity[4];
uint16_t length;
} relay_header_t;
typedef struct buf_t buf_t;
typedef struct socks_request_t socks_request_t;
struct connection_t {
uint8_t type;
uint8_t state;
uint8_t wants_to_read; /* should we start reading again once
* the bandwidth throttler allows it?
*/
uint8_t wants_to_write; /* should we start writing again once
* the bandwidth throttler allows reads?
*/
int s; /* our socket */
int poll_index; /* index of this conn into the poll_array */
int marked_for_close; /* should we close this conn on the next
* iteration of the main loop?
*/
buf_t *inbuf;
int inbuf_reached_eof; /* did read() return 0 on this conn? */
time_t timestamp_lastread; /* when was the last time poll() said we could read? */
buf_t *outbuf;
int 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? */
uint32_t addr; /* these two uniquely identify a router. Both in host order. */
uint16_t port; /* if non-zero, they identify the guy 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 *onion_pkey; /* public RSA key for the other side's onions */
crypto_pk_env_t *link_pkey; /* public RSA key for the other side's TLS */
crypto_pk_env_t *identity_pkey; /* public RSA key for the other side's signing */
char *nickname;
/* Used only by OR connections: */
tor_tls *tls;
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.*/
/* bandwidth and receiver_bucket only used by ORs in OPEN state: */
uint32_t bandwidth; /* connection bandwidth. */
int receiver_bucket; /* when this hits 0, stop receiving. Every second we
* add 'bandwidth' to this, capping it at 10*bandwidth.
*/
/* Used only by edge connections: */
uint16_t stream_id;
struct connection_t *next_stream; /* points to the next stream at this edge, if any */
struct crypt_path_t *cpath_layer; /* a pointer to which node in the circ this conn exits at */
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? */
int done_sending; /* for half-open connections; not used currently */
int done_receiving;
char has_sent_end; /* for debugging: set once we've set the stream end,
and check in circuit_about_to_close_connection() */
/* Used only by AP connections */
socks_request_t *socks_request;
};
typedef struct connection_t connection_t;
#define EXIT_POLICY_ACCEPT 1
#define EXIT_POLICY_REJECT 2
struct exit_policy_t {
char policy_type;
char *string;
uint32_t addr;
uint32_t msk;
uint16_t prt_min;
uint16_t prt_max;
struct exit_policy_t *next;
};
/* config stuff we know about the other ORs in the network */
typedef struct {
char *address;
char *nickname;
uint32_t addr; /* all host order */
uint16_t or_port;
uint16_t socks_port;
uint16_t dir_port;
time_t published_on;
crypto_pk_env_t *onion_pkey; /* public RSA key for onions */
crypto_pk_env_t *link_pkey; /* public RSA key for TLS */
crypto_pk_env_t *identity_pkey; /* public RSA key for signing */
int is_running;
/* link info */
uint32_t bandwidthrate;
uint32_t bandwidthburst;
struct exit_policy_t *exit_policy;
} routerinfo_t;
#define MAX_ROUTERS_IN_DIR 1024
typedef struct {
routerinfo_t **routers;
int n_routers;
char *software_versions;
time_t published_on;
} routerlist_t;
struct crypt_path_t {
/* crypto environments */
crypto_cipher_env_t *f_crypto;
crypto_cipher_env_t *b_crypto;
crypto_digest_env_t *f_digest; /* for integrity checking */
crypto_digest_env_t *b_digest;
crypto_dh_env_t *handshake_state;
uint32_t addr;
uint16_t port;
uint8_t state;
#define CPATH_STATE_CLOSED 0
#define CPATH_STATE_AWAITING_KEYS 1
#define CPATH_STATE_OPEN 2
struct crypt_path_t *next;
struct crypt_path_t *prev; /* doubly linked list */
int package_window;
int deliver_window;
};
#define DH_KEY_LEN CRYPTO_DH_SIZE
#define ONIONSKIN_CHALLENGE_LEN (16+DH_KEY_LEN)
#define ONIONSKIN_REPLY_LEN (DH_KEY_LEN+20)
typedef struct crypt_path_t crypt_path_t;
typedef struct {
int desired_path_len;
char *chosen_exit; /* nickname of planned exit node */
} cpath_build_state_t;
/* struct for a path (circuit) through the network */
struct circuit_t {
uint32_t n_addr;
uint16_t n_port;
connection_t *p_conn;
connection_t *n_conn; /* for the OR conn, if there is one */
connection_t *p_streams;
connection_t *n_streams;
uint16_t next_stream_id;
int package_window;
int deliver_window;
uint16_t p_circ_id; /* circuit identifiers */
uint16_t n_circ_id;
crypto_cipher_env_t *p_crypto; /* used only for intermediate hops */
crypto_cipher_env_t *n_crypto;
crypto_digest_env_t *p_digest; /* for integrity checking, */
crypto_digest_env_t *n_digest; /* intermediate hops only */
cpath_build_state_t *build_state;
crypt_path_t *cpath;
char onionskin[ONIONSKIN_CHALLENGE_LEN]; /* for storage while onionskin pending */
time_t timestamp_created;
time_t timestamp_dirty; /* when the circuit was first used, or 0 if clean */
uint8_t state;
void *next;
};
typedef struct circuit_t circuit_t;
typedef struct {
char *LogLevel;
char *LogFile;
char *DebugLogFile;
char *DataDirectory;
char *RouterFile;
char *Nickname;
char *Address;
char *PidFile;
char *ExitNodes;
char *EntryNodes;
char *ExcludedNodes;
char *ExitPolicy;
char *SocksBindAddress;
char *ORBindAddress;
char *DirBindAddress;
char *RecommendedVersions;
char *User;
char *Group;
double PathlenCoinWeight;
int ORPort;
int SocksPort;
int DirPort;
int MaxConn;
int TrafficShaping;
int LinkPadding;
int IgnoreVersion;
int RunAsDaemon;
int DirRebuildPeriod;
int DirFetchPostPeriod;
int KeepalivePeriod;
int MaxOnionsPending;
int NewCircuitPeriod;
int BandwidthRate;
int BandwidthBurst;
int NumCpus;
int loglevel;
} or_options_t;
/* XXX are these good enough defaults? */
#define MAX_SOCKS_REPLY_LEN 256
/* Not 256; addresses must fit in a begin cell. */
#define MAX_SOCKS_ADDR_LEN 200
struct socks_request_t {
char socks_version;
int replylen;
char reply[MAX_SOCKS_REPLY_LEN];
char address[MAX_SOCKS_ADDR_LEN];
uint16_t port;
};
/* all the function prototypes go here */
/********************************* buffers.c ***************************/
int find_on_inbuf(char *string, int string_len, buf_t *buf);
buf_t *buf_new();
buf_t *buf_new_with_capacity(size_t size);
void buf_free(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, int at_most, buf_t *buf, int *reached_eof);
int read_to_buf_tls(tor_tls *tls, int at_most, buf_t *buf);
int flush_buf(int s, buf_t *buf, int *buf_flushlen);
int flush_buf_tls(tor_tls *tls, buf_t *buf, int *buf_flushlen);
int write_to_buf(const char *string, int string_len, buf_t *buf);
int fetch_from_buf(char *string, int string_len, buf_t *buf);
int fetch_from_buf_http(buf_t *buf,
char **headers_out, int max_headerlen,
char **body_out, int max_bodylen);
int fetch_from_buf_socks(buf_t *buf, socks_request_t *req);
/********************************* circuit.c ***************************/
void circuit_add(circuit_t *circ);
void circuit_remove(circuit_t *circ);
circuit_t *circuit_new(uint16_t p_circ_id, connection_t *p_conn);
void circuit_free(circuit_t *circ);
void circuit_free_cpath(crypt_path_t *cpath);
circuit_t *circuit_get_by_circ_id_conn(uint16_t circ_id, connection_t *conn);
circuit_t *circuit_get_by_conn(connection_t *conn);
circuit_t *circuit_get_newest(connection_t *conn, int must_be_open);
void circuit_expire_building(void);
int circuit_count_building(void);
int circuit_stream_is_being_handled(connection_t *conn);
int circuit_receive_relay_cell(cell_t *cell, circuit_t *circ,
int cell_direction);
int circuit_package_relay_cell(cell_t *cell, circuit_t *circ,
int cell_direction, crypt_path_t *layer_hint);
void circuit_resume_edge_reading(circuit_t *circ, int edge_type, crypt_path_t *layer_hint);
int circuit_consider_stop_edge_reading(circuit_t *circ, int edge_type, crypt_path_t *layer_hint);
void circuit_consider_sending_sendme(circuit_t *circ, int edge_type, crypt_path_t *layer_hint);
void circuit_close(circuit_t *circ);
void circuit_about_to_close_connection(connection_t *conn);
void circuit_log_path(int severity, circuit_t *circ);
void circuit_dump_by_conn(connection_t *conn, int severity);
void circuit_expire_unused_circuits(void);
int circuit_launch_new(void);
void circuit_increment_failure_count(void);
void circuit_reset_failure_count(void);
int circuit_establish_circuit(void);
void circuit_n_conn_open(connection_t *or_conn);
int circuit_send_next_onion_skin(circuit_t *circ);
int circuit_extend(cell_t *cell, circuit_t *circ);
int circuit_finish_handshake(circuit_t *circ, char *reply);
int circuit_truncated(circuit_t *circ, crypt_path_t *layer);
void assert_cpath_ok(const crypt_path_t *c);
void assert_cpath_layer_ok(const crypt_path_t *c);
void assert_circuit_ok(const circuit_t *c);
extern unsigned long stats_n_relay_cells_relayed;
extern unsigned long stats_n_relay_cells_delivered;
/********************************* 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 ***************************/
int getconfig(int argc, char **argv, or_options_t *options);
/********************************* connection.c ***************************/
connection_t *connection_new(int type);
void connection_free(connection_t *conn);
void connection_free_all(void);
int connection_create_listener(char *bindaddress, uint16_t bindport, int type);
int connection_connect(connection_t *conn, char *address, uint32_t addr, uint16_t port);
int retry_all_connections(void);
int connection_handle_read(connection_t *conn);
int connection_read_to_buf(connection_t *conn);
int connection_fetch_from_buf(char *string, int len, connection_t *conn);
int connection_find_on_inbuf(char *string, int 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_write_to_buf(const char *string, int len, connection_t *conn);
connection_t *connection_twin_get_by_addr_port(uint32_t addr, uint16_t port);
connection_t *connection_exact_get_by_addr_port(uint32_t addr, uint16_t port);
connection_t *connection_get_by_type(int type);
connection_t *connection_get_by_type_state(int type, int state);
connection_t *connection_get_by_type_state_lastwritten(int type, int state);
int connection_receiver_bucket_should_increase(connection_t *conn);
#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_send_destroy(uint16_t circ_id, connection_t *conn);
int connection_process_inbuf(connection_t *conn);
int connection_finished_flushing(connection_t *conn);
void assert_connection_ok(connection_t *conn, time_t now);
/********************************* connection_edge.c ***************************/
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_process_inbuf(connection_t *conn);
int connection_edge_end(connection_t *conn, char reason, crypt_path_t *cpath_layer);
int connection_edge_send_command(connection_t *fromconn, circuit_t *circ, int relay_command,
void *payload, int payload_len, crypt_path_t *cpath_layer);
int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, connection_t *conn,
int edge_type, crypt_path_t *layer_hint);
int connection_edge_finished_flushing(connection_t *conn);
int connection_edge_package_raw_inbuf(connection_t *conn);
void connection_exit_connect(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);
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;
void client_dns_init(void);
void client_dns_clean(void);
/********************************* connection_or.c ***************************/
int connection_or_process_inbuf(connection_t *conn);
int connection_or_finished_flushing(connection_t *conn);
void connection_or_init_conn_from_router(connection_t *conn, routerinfo_t *router);
connection_t *connection_or_connect(routerinfo_t *router);
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);
/********************************* cpuworker.c *****************************/
void cpu_init(void);
int connection_cpu_finished_flushing(connection_t *conn);
int connection_cpu_process_inbuf(connection_t *conn);
int cpuworker_main(void *data);
int assign_to_cpuworker(connection_t *cpuworker, unsigned char question_type,
void *task);
/********************************* directory.c ***************************/
void directory_initiate_command(routerinfo_t *router, int command);
int connection_dir_process_inbuf(connection_t *conn);
int connection_dir_finished_flushing(connection_t *conn);
/********************************* dns.c ***************************/
void dns_init(void);
int connection_dns_finished_flushing(connection_t *conn);
int connection_dns_process_inbuf(connection_t *conn);
void dns_cancel_pending_resolve(char *question, connection_t *onlyconn);
int dns_resolve(connection_t *exitconn);
/********************************* main.c ***************************/
int connection_add(connection_t *conn);
int connection_remove(connection_t *conn);
void connection_set_poll_socket(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);
void connection_stop_writing(connection_t *conn);
void connection_start_writing(connection_t *conn);
int main(int argc, char *argv[]);
/********************************* onion.c ***************************/
int decide_circ_id_type(char *local_nick, char *remote_nick);
int onion_pending_add(circuit_t *circ);
circuit_t *onion_next_task(void);
void onion_pending_remove(circuit_t *circ);
int onionskin_answer(circuit_t *circ, unsigned char *payload, unsigned char *keys);
int onion_extend_cpath(crypt_path_t **head_ptr, cpath_build_state_t *state,
routerinfo_t **router_out);
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(char *onion_skin,
crypto_pk_env_t *private_key,
char *handshake_reply_out,
char *key_out,
int key_out_len);
int onion_skin_client_handshake(crypto_dh_env_t *handshake_state,
char *handshake_reply,
char *key_out,
int key_out_len);
cpath_build_state_t *onion_new_cpath_build_state(void);
/********************************* router.c ***************************/
void set_onion_key(crypto_pk_env_t *k);
crypto_pk_env_t *get_onion_key(void);
void set_identity_key(crypto_pk_env_t *k);
crypto_pk_env_t *get_identity_key(void);
crypto_pk_env_t *get_link_key(void);
int init_keys(void);
void router_retry_connections(void);
void router_upload_desc_to_dirservers(void);
int router_compare_to_my_exit_policy(connection_t *conn);
const char *router_get_my_descriptor(void);
int router_rebuild_descriptor(void);
int router_dump_router_to_string(char *s, int maxlen, routerinfo_t *router,
crypto_pk_env_t *ident_key);
/********************************* routerlist.c ***************************/
routerinfo_t *router_pick_directory_server(void);
routerinfo_t *router_get_by_addr_port(uint32_t addr, uint16_t port);
routerinfo_t *router_get_by_link_pk(crypto_pk_env_t *pk);
routerinfo_t *router_get_by_nickname(char *nickname);
void router_get_routerlist(routerlist_t **prouterlist);
void routerinfo_free(routerinfo_t *router);
void router_mark_as_down(char *nickname);
int router_set_routerlist_from_file(char *routerfile);
int router_get_dir_hash(const char *s, char *digest);
int router_get_router_hash(const char *s, char *digest);
int router_set_routerlist_from_directory(const char *s, crypto_pk_env_t *pkey);
routerinfo_t *router_get_entry_from_string(const char **s);
int router_add_exit_policy_from_string(routerinfo_t *router, const char *s);
int router_compare_addr_to_exit_policy(uint32_t addr, uint16_t port,
struct exit_policy_t *policy);
#define ADDR_POLICY_ACCEPTED 0
#define ADDR_POLICY_REJECTED -1
#define ADDR_POLICY_UNKNOWN 1
int router_exit_policy_all_routers_reject(uint32_t addr, uint16_t port);
int router_exit_policy_rejects_all(routerinfo_t *router);
/********************************* 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();
int dirserv_add_descriptor(const char **desc);
int dirserv_init_from_directory_string(const char *dir);
void dirserv_free_descriptors();
int dirserv_dump_directory_to_string(char *s, int maxlen,
crypto_pk_env_t *private_key);
void directory_set_dirty();
size_t dirserv_get_directory(const char **cp);
#endif
/*
Local Variables:
mode:c
indent-tabs-mode:nil
c-basic-offset:2
End:
*/
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