/* Copyright 2001,2002,2003 Roger Dingledine, Matej Pfajfar. */ /* See LICENSE for licensing information */ /* $Id$ */ /** * \file or.h * * \brief Master header file for Tor-specific functionality. */ #ifndef __OR_H #define __OR_H #include "orconfig.h" #ifdef MS_WINDOWS #define WIN32_WINNT 0x400 #define _WIN32_WINNT 0x400 #define WIN32_LEAN_AND_MEAN #endif #include #include #include #ifdef HAVE_UNISTD_H #include #endif #ifdef HAVE_STRING_H #include #endif #ifdef HAVE_SIGNAL_H #include #endif #ifdef HAVE_NETDB_H #include #endif #ifdef HAVE_CTYPE_H #include #endif #include "../common/torint.h" #include "../common/fakepoll.h" #ifdef HAVE_INTTYPES_H #include #endif #ifdef HAVE_SYS_PARAM_H #include /* FreeBSD needs this to know what version it is */ #endif #ifdef HAVE_SYS_LIMITS_H #include #endif #ifdef HAVE_MACHINE_LIMITS_H #ifndef __FreeBSD__ /* FreeBSD has a bug where it complains that this file is obsolete, and I should migrate to using sys/limits.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 #endif #endif #ifdef HAVE_SYS_TYPES_H #include /* Must be included before sys/stat.h for Ultrix */ #endif #ifdef HAVE_SYS_WAIT_H #include #endif #ifdef HAVE_SYS_FCNTL_H #include #endif #ifdef HAVE_FCNTL_H #include #endif #ifdef HAVE_SYS_IOCTL_H #include #endif #ifdef HAVE_SYS_SOCKET_H #include #endif #ifdef HAVE_SYS_TIME_H #include #endif #ifdef HAVE_SYS_STAT_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif #ifdef HAVE_ARPA_INET_H #include #endif #ifdef HAVE_ERRNO_H #include #endif #ifdef HAVE_ASSERT_H #include #endif #ifdef HAVE_TIME_H #include #endif #ifdef MS_WINDOWS #if (_MSC_VER <= 1300) #include #else #include #include #endif #endif #ifdef MS_WINDOWS #include #include #include #include #define snprintf _snprintf #endif #include "../common/crypto.h" #include "../common/tortls.h" #include "../common/log.h" #include "../common/util.h" #include "../common/torgzip.h" /** Upper bound on maximum simultaneous connections; can be lowered by * config file. */ #define MAXCONNECTIONS 10000 #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 #define MAX_DIR_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 (15*60) #endif /** How often do we rotate onion keys? */ #define OLD_MIN_ONION_KEY_LIFETIME (12*60*60) /* twice a day */ #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) #define CIRC_ID_TYPE_LOWER 0 #define CIRC_ID_TYPE_HIGHER 1 #define _CONN_TYPE_MIN 3 /** Type for sockets listening for OR connections. */ #define CONN_TYPE_OR_LISTENER 3 /** Type for OR-to-OR or OP-to-OR connections. */ #define CONN_TYPE_OR 4 /** Type for connections from final OR to chosen destination. */ #define CONN_TYPE_EXIT 5 /** Type for sockets listening for SOCKS connections. */ #define CONN_TYPE_AP_LISTENER 6 /** Type for SOCKS connections to OP. */ #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 /** Type for connections to local dnsworker processes. */ #define CONN_TYPE_DNSWORKER 10 /** Type for connections to local cpuworker processes. */ #define CONN_TYPE_CPUWORKER 11 #define _CONN_TYPE_MAX 11 /** 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: SSL is handshaking, not done yet. */ #define OR_CONN_STATE_HANDSHAKING 2 /** State for a connection to an OR: Ready to send/receive cells. */ #define OR_CONN_STATE_OPEN 3 #define _OR_CONN_STATE_MAX 3 #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 #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 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 /** State for a SOCKS connection: waiting for a completed circuit. */ #define AP_CONN_STATE_CIRCUIT_WAIT 7 /** State for a SOCKS connection: sent BEGIN, waiting for CONNECTED. */ #define AP_CONN_STATE_CONNECT_WAIT 8 /** State for a SOCKS connection: send RESOLVE, waiting for RESOLVED. */ #define AP_CONN_STATE_RESOLVE_WAIT 9 /** State for a SOCKS connection: ready to send and receive. */ #define AP_CONN_STATE_OPEN 10 #define _AP_CONN_STATE_MAX 10 #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 at directory server: waiting for HTTP request. */ #define DIR_CONN_STATE_SERVER_COMMAND_WAIT 4 /** State for connection at directory server: sending HTTP response. */ #define DIR_CONN_STATE_SERVER_WRITING 5 #define _DIR_CONN_STATE_MAX 5 #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 /** Purpose for connection to directory server: upload a server descriptor. */ #define DIR_PURPOSE_UPLOAD_DIR 5 /** Purpose for connection to directory server: upload a rendezvous * descriptor. */ #define DIR_PURPOSE_UPLOAD_RENDDESC 6 /** Purpose for connection at a directory server. */ #define DIR_PURPOSE_SERVER 7 #define _DIR_PURPOSE_MAX 7 #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 #define _CIRCUIT_PURPOSE_MAX 16 /** True iff the circuit purpose p 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 _MIN_END_STREAM_REASON 1 #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 #define END_STREAM_REASON_TIMEOUT 7 #define _MAX_END_STREAM_REASON 7 #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 /* 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" #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] */ #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. */ unsigned char command; /**< Type of the cell: one of PADDING, CREATE, RELAY, * or DESTROY. */ unsigned 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. */ 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; /**< Index of this conn into the poll_array. */ 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? */ 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). */ /* 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) */ /* 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(). */ char num_retries; /**< How many times have we re-tried beginning this stream? (Edge only) */ /* Used only by AP connections */ socks_request_t *socks_request; /**< SOCKS structure describing request (AP * only.) */ }; typedef struct connection_t connection_t; #define EXIT_POLICY_ACCEPT 1 #define EXIT_POLICY_REJECT 2 /** A linked list of exit policy rules */ struct exit_policy_t { char policy_type; /**< One of EXIT_POLICY_ACCEPT or EXIT_POLICY_REJECT. */ char *string; /**< String representation of this rule. */ uint32_t addr; /**< Base address to accept or reject. */ uint32_t msk; /**< Accept/reject all addresses a such that a & msk == * addr & msk . */ uint16_t prt_min; /**< Lowest port number to accept/reject. */ uint16_t prt_max; /**< Highest port number to accept/reject. */ struct exit_policy_t *next; /**< Next rule in list. */ }; /** Information about another onion router in the network. */ typedef struct { 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 socks_port; /**< Port for SOCKS 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; struct exit_policy_t *exit_policy; /**< What streams will this OR permit * to exit? */ long uptime; /**< How many seconds the router claims to have been up */ /* local info */ int is_running; /**< As far as we know, is this OR currently running? */ time_t status_set_at; /**< When did we last update is_running? */ int is_verified; /**< Has a trusted dirserver validated this OR? */ smartlist_t *declared_family; /**< Nicknames of router which this router * claims are its family. */ } routerinfo_t; /** Contents of a directory of onion routers. */ typedef struct { /** List of routerinfo_t */ smartlist_t *routers; /** Which versions of tor are recommended by this directory? */ char *software_versions; /** When was the most recent directory that contributed to this list * published? */ time_t published_on; time_t running_routers_updated_on; /** Which router is claimed to have signed it? */ char *signing_router; } routerlist_t; /** 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; int is_running_routers_format; /**< Are we using the old entry format? */ } running_routers_t; /** Holds accounting information for a single step in the layered encryption * performed by a circuit. Used only at the client edge of a circuit. */ struct crypt_path_t { /* 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 *handshake_state; /** Negotiated key material shared with the OR at this step. */ char handshake_digest[DIGEST_LEN];/* KH in tor-spec.txt */ /** IP4 address of the OR at this step. */ uint32_t addr; /** Port of the OR at this step. */ uint16_t port; /** Identity key digest of the OR at this step. */ char identity_digest[DIGEST_LEN]; /** 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? */ }; #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 typedef struct crypt_path_t crypt_path_t; /** Information used to build a circuit. */ typedef struct { /** Intended length of the final circuit. */ int desired_path_len; /** Nickname of planned exit node. */ char *chosen_exit_name; /** Identity of planned exit node. */ char chosen_exit_digest[DIGEST_LEN]; /** The crypt_path_t to append after rendezvous: used for rendezvous. */ struct crypt_path_t *pending_final_cpath; /** How many times has building a circuit for this task failed? */ int failure_count; } cpath_build_state_t; #define CIRCUIT_MAGIC 0x35315243u /** Struct for a path (circuit) through the onion routing network. */ 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; 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; /** Configuration options for a Tor process */ typedef struct { /** What should the tor process actually do? */ enum { CMD_RUN_TOR=0, CMD_LIST_FINGERPRINT } command; struct config_line_t *LogOptions; /**< List of configuration lines * for logfiles */ 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; */ struct config_line_t *ExitPolicy; /**< Lists of exit policy components. */ struct config_line_t *SocksPolicy; /**< Lists of socks policy components */ struct config_line_t *DirPolicy; /**< Lists of dir policy components */ /** Addresses to bind for listening for SOCKS connections. */ struct config_line_t *SocksBindAddress; /** Addresses to bind for listening for OR connections. */ struct config_line_t *ORBindAddress; /** Addresses to bind for listening for directory connections. */ struct config_line_t *DirBindAddress; /** Local address to bind outbound sockets */ char *OutboundBindAddress; struct config_line_t *RecommendedVersions; /**< Directory server only: which versions of * Tor should we tell users to run? */ 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 DirPort; /**< Port to listen on for directory connections. */ int AuthoritativeDir; /**< Boolean: is this an authoritative directory? */ int ClientOnly; /**< Boolean: should we never evolve into a server role? */ int MaxConn; /**< 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. */ int DirFetchPostPeriod; /**< How often do we fetch new directories * and post server descriptros to the directory * server? */ 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 BandwidthRate; /**< How much bandwidth, on average, are we willing to * use in a second? */ int BandwidthBurst; /**< How much bandwidth, at maximum, are we willing to * use in a second? */ 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. */ struct 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 */ struct config_line_t *DirServers; /**< List of configuration lines * for directory servers. */ char *MyFamily; /**< Declared family for this OR. */ struct config_line_t *NodeFamilies; /**< List of config lines for * node families */ struct config_line_t *RedirectExit; /**< List of config lines for simple * addr/port redirection */ smartlist_t *RedirectExitList; /**< List of exit_redirect_t */ } or_options_t; /* XXX are these good enough defaults? */ #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 reply. */ 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); 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); void assert_buf_ok(buf_t *buf); /********************************* circuitbuild.c **********************/ 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_establish_circuit(uint8_t purpose, const char *exit_digest); void circuit_n_conn_done(connection_t *or_conn, int success); int circuit_send_next_onion_skin(circuit_t *circ); 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, char *reply); int circuit_truncated(circuit_t *circ, crypt_path_t *layer); int onionskin_answer(circuit_t *circ, unsigned char *payload, unsigned char *keys); void onion_append_to_cpath(crypt_path_t **head_ptr, crypt_path_t *new_hop); /********************************* circuitlist.c ***********************/ extern const char *circuit_state_to_string[]; void circuit_close_all_marked(void); circuit_t *circuit_new(uint16_t p_circ_id, connection_t *p_conn); void circuit_free_cpath_node(crypt_path_t *victim); 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_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); int circuit_count_building(uint8_t purpose); circuit_t *circuit_get_youngest_clean_open(uint8_t purpose); int _circuit_mark_for_close(circuit_t *circ); #define circuit_mark_for_close(c) \ do { \ if (_circuit_mark_for_close(c)<0) { \ log(LOG_WARN,"Duplicate call to circuit_mark_for_close at %s:%d (first at %s:%d)", \ __FILE__,__LINE__,c->marked_for_close_file,c->marked_for_close); \ } else { \ c->marked_for_close_file = __FILE__; \ c->marked_for_close = __LINE__; \ } \ } while (0) void assert_cpath_layer_ok(const crypt_path_t *cp); void assert_circuit_ok(const circuit_t *c); /********************************* circuituse.c ************************/ void circuit_expire_building(time_t now); int circuit_stream_is_being_handled(connection_t *conn); 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); circuit_t *circuit_launch_by_identity(uint8_t purpose, const char *exit_digest); void circuit_reset_failure_count(int timeout); int connection_ap_handshake_attach_circuit(connection_t *conn); int circuit_init_cpath_crypto(crypt_path_t *cpath, char *key_data,int reverse); int circuit_finish_handshake(circuit_t *circ, char *reply); int circuit_truncated(circuit_t *circ, crypt_path_t *layer); void assert_cpath_layer_ok(const crypt_path_t *c); void assert_circuit_ok(const circuit_t *c); /********************************* 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 ***************************/ struct config_line_t { char *key; char *value; struct config_line_t *next; }; int config_assign_default_dirservers(void); int resolve_my_address(const char *address, uint32_t *addr); int getconfig(int argc, char **argv, or_options_t *options); int config_init_logs(or_options_t *options); void config_parse_exit_policy(struct config_line_t *cfg, struct exit_policy_t **dest); void exit_policy_free(struct exit_policy_t *p); const char *get_data_directory(or_options_t *options); /********************************* connection.c ***************************/ #define CONN_TYPE_TO_STRING(t) (((t) < _CONN_TYPE_MIN || (t) > _CONN_TYPE_MAX) ? \ "Unknown" : conn_type_to_string[(t)]) extern const char *conn_type_to_string[]; extern const char *conn_state_to_string[][_CONN_TYPE_MAX+1]; connection_t *connection_new(int type); 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); int _connection_mark_for_close(connection_t *conn); #define connection_mark_for_close(c) \ do { \ if (_connection_mark_for_close(c)<0) { \ log(LOG_WARN,"Duplicate call to connection_mark_for_close at %s:%d (first at %s:%d)", \ __FILE__,__LINE__,c->marked_for_close_file,c->marked_for_close); \ } else { \ c->marked_for_close_file = __FILE__; \ c->marked_for_close = __LINE__; \ } \ } while (0) 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); 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_write_to_buf(const char *string, size_t len, connection_t *conn); connection_t *connection_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_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); connection_t *connection_get_by_type_rendquery(int type, 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); void assert_connection_ok(connection_t *conn, time_t now); int connection_or_nonopen_was_started_here(connection_t *conn); /********************************* connection_edge.c ***************************/ int connection_edge_process_inbuf(connection_t *conn); 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_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, int success); void connection_ap_handshake_socks_resolved(connection_t *conn, int answer_type, size_t answer_len, const char *answer); 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 socks_policy_permits_address(uint32_t addr); void client_dns_init(void); uint32_t client_dns_lookup_entry(const char *address); int client_dns_incr_failures(const char *address); void client_dns_set_entry(const char *address, uint32_t val); void client_dns_clean(void); /********************************* connection_or.c ***************************/ 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); /********************************* cpuworker.c *****************************/ void cpu_init(void); void cpuworkers_rotate(void); int connection_cpu_finished_flushing(connection_t *conn); int connection_cpu_process_inbuf(connection_t *conn); int assign_to_cpuworker(connection_t *cpuworker, unsigned char 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 *payload, size_t payload_len); int connection_dir_process_inbuf(connection_t *conn); int connection_dir_finished_flushing(connection_t *conn); int connection_dir_finished_connecting(connection_t *conn); /********************************* 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); int dirserv_load_from_directory_string(const char *dir); void dirserv_free_descriptors(void); void dirserv_remove_old_servers(int age); int dirserv_dump_directory_to_string(char *s, size_t maxlen, 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); void dirserv_set_cached_directory(const char *directory, time_t when); /********************************* dns.c ***************************/ void dns_init(void); int connection_dns_finished_flushing(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); /********************************* main.c ***************************/ int connection_add(connection_t *conn); int connection_remove(connection_t *conn); int connection_in_array(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_has_arrived(time_t now); int authdir_mode(void); int clique_mode(void); int server_mode(void); int advertised_server_mode(void); int proxy_mode(void); void handle_signals(int is_parent); void tor_cleanup(void); /********************************* 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(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, char *handshake_reply, char *key_out, size_t key_out_len); /********************************* 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); void connection_edge_consider_sending_sendme(connection_t *conn); 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); /********************************* 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(char *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_fetched(char *query, int success); char *rend_client_get_random_intro(char *query); int rend_parse_rendezvous_address(char *address); int rend_client_send_introduction(circuit_t *introcirc, circuit_t *rendcirc); /********************************* rendcommon.c ***************************/ typedef struct rend_service_descriptor_t { crypto_pk_env_t *pk; time_t timestamp; int n_intro_points; char **intro_points; } 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, 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 did we get the descriptor? */ 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); int rend_valid_service_id(const char *query); int rend_cache_lookup_desc(const char *query, const char **desc, size_t *desc_len); int rend_cache_lookup_entry(const char *query, rend_cache_entry_t **entry_out); int rend_cache_store(const char *desc, size_t desc_len); /********************************* rendservice.c ***************************/ int rend_config_services(or_options_t *options); int rend_service_load_keys(void); void rend_services_init(void); void rend_services_introduce(void); void rend_services_upload(int force); 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); /********************************* 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 ***************************/ 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); void dup_onion_keys(crypto_pk_env_t **key, crypto_pk_env_t **last); int init_keys(void); crypto_pk_env_t *init_key_from_file(const char *fname); void rotate_onion_key(void); void router_set_bandwidth_capacity(int bw); int router_get_bandwidth_capacity(void); void router_retry_connections(void); int router_is_clique_mode(routerinfo_t *router); void router_upload_dir_desc_to_dirservers(void); 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_is_me(routerinfo_t *router); int router_rebuild_descriptor(void); 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); /********************************* routerlist.c ***************************/ typedef struct trusted_dir_server_t { char *address; uint32_t addr; uint16_t dir_port; char digest[DIGEST_LEN]; int is_running; } trusted_dir_server_t; int router_reload_router_list(void); void router_get_trusted_dir_servers(smartlist_t **outp); routerinfo_t *router_pick_directory_server(int requireothers, int fascistfirewall); trusted_dir_server_t *router_pick_trusteddirserver(int requireothers, int fascistfirewall); int all_trusted_directory_servers_down(void); struct smartlist_t; void routerlist_add_family(struct smartlist_t *sl, routerinfo_t *router); void add_nickname_list_to_smartlist(struct smartlist_t *sl, const char *list, int warn_if_down); int router_nickname_is_in_list(routerinfo_t *router, const char *list); routerinfo_t *routerlist_find_my_routerinfo(void); int router_nickname_matches(routerinfo_t *router, const char *nickname); int router_is_unreliable_router(routerinfo_t *router, int need_uptime, int need_bw); routerinfo_t *routerlist_sl_choose_by_bandwidth(smartlist_t *sl); routerinfo_t *router_choose_random_node(const char *preferred, const char *excluded, struct smartlist_t *excludedsmartlist, int preferuptime, int preferbandwidth, int allow_unverified, int strict); routerinfo_t *router_get_by_addr_port(uint32_t addr, uint16_t port); 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); time_t routerlist_get_published_time(void); void routerlist_free(routerlist_t *routerlist); void routerinfo_free(routerinfo_t *router); 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_load_routerlist_from_directory(const char *s,crypto_pk_env_t *pkey, int check_version); 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); void running_routers_free(running_routers_t *rr); void routerlist_update_from_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 rr_format); int router_update_status_from_smartlist(routerinfo_t *r, time_t list_time, smartlist_t *running_list, int rr_format); void add_trusted_dir_server(const char *addr, uint16_t port,const char *digest); void clear_trusted_dir_servers(void); /********************************* routerparse.c ************************/ typedef struct tor_version_t { int major; int minor; int micro; enum { VER_PRE=0, VER_RC=1, VER_RELEASE=2 } status; int patchlevel; enum { IS_CVS=0, IS_NOT_CVS=1} cvs; } 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_parse_list_from_string(const char **s, routerlist_t **dest, smartlist_t *good_nickname_list, int rr_format, time_t published); int router_parse_routerlist_from_directory(const char *s, routerlist_t **dest, crypto_pk_env_t *pkey, int check_version); running_routers_t *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); struct exit_policy_t *router_parse_exit_policy_from_string(const char *s); int check_software_version_against_directory(const char *directory, int ignoreversion); 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); #endif /* Local Variables: mode:c indent-tabs-mode:nil c-basic-offset:2 End: */