src/or/or.h

   1 /* Copyright 2001,2002,2003 Roger Dingledine, Matej Pfajfar. */
   2 /* See LICENSE for licensing information */
   3 /* $Id$ */
   4
   5 #ifndef __OR_H
   6 #define __OR_H
   7
   8 #include "orconfig.h"
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <limits.h>
  13 #ifdef HAVE_UNISTD_H
  14 #include <unistd.h>
  15 #endif
  16 #ifdef HAVE_STRING_H
  17 #include <string.h>
  18 #endif
  19 #ifdef HAVE_SIGNAL_H
  20 #include <signal.h>
  21 #endif
  22 #ifdef HAVE_NETDB_H
  23 #include <netdb.h>
  24 #endif
  25 #ifdef HAVE_CTYPE_H
  26 #include <ctype.h>
  27 #endif
  28 #include "../common/torint.h"
  29 #ifdef HAVE_SYS_POLL_H
  30 #include <sys/poll.h>
  31 #elif HAVE_POLL_H
  32 #include <poll.h>
  33 #else
  34 #include "../common/fakepoll.h"
  35 #endif
  36 #ifdef HAVE_SYS_TYPES_H
  37 #include <sys/types.h> /* Must be included before sys/stat.h for Ultrix */
  38 #endif
  39 #ifdef HAVE_SYS_WAIT_H
  40 #include <sys/wait.h>
  41 #endif
  42 #ifdef HAVE_SYS_FCNTL_H
  43 #include <sys/fcntl.h>
  44 #endif
  45 #ifdef HAVE_FCNTL_H
  46 #include <fcntl.h>
  47 #endif
  48 #ifdef HAVE_SYS_IOCTL_H
  49 #include <sys/ioctl.h>
  50 #endif
  51 #ifdef HAVE_SYS_SOCKET_H
  52 #include <sys/socket.h>
  53 #endif
  54 #ifdef HAVE_SYS_TIME_H
  55 #include <sys/time.h>
  56 #endif
  57 #ifdef HAVE_SYS_STAT_H
  58 #include <sys/stat.h>
  59 #endif
  60 #ifdef HAVE_NETINET_IN_H
  61 #include <netinet/in.h>
  62 #endif
  63 #ifdef HAVE_ARPA_INET_H
  64 #include <arpa/inet.h>
  65 #endif
  66 #ifdef HAVE_ERRNO_H
  67 #include <errno.h>
  68 #endif
  69 #ifdef HAVE_ASSERT_H
  70 #include <assert.h>
  71 #endif
  72 #ifdef HAVE_TIME_H
  73 #include <time.h>
  74 #endif
  75 #ifdef HAVE_PWD_H
  76 #include <pwd.h>
  77 #endif
  78 #ifdef HAVE_GRP_H
  79 #include <grp.h>
  80 #endif
  81 #ifdef HAVE_WINSOCK_H
  82 #include <winsock.h>
  83 #endif
  84 #if _MSC_VER > 1300
  85 #include <winsock2.h>
  86 #include <ws2tcpip.h>
  87 #elif defined(_MSC_VER)
  88 #include <winsock.h>
  89 #endif
  90
  91 #ifdef MS_WINDOWS
  92 #include <io.h>
  93 #include <process.h>
  94 #define WIN32_LEAN_AND_MEAN
  95 #include <windows.h>
  96 #define snprintf _snprintf
  97 #endif
  98
  99 #include "../common/crypto.h"
 100 #include "../common/tortls.h"
 101 #include "../common/log.h"
 102 #include "../common/util.h"
 103
 104 #define MAXCONNECTIONS 1000 /* upper bound on max connections.
 105                               can be lowered by config file */
 106
 107 #define DEFAULT_BANDWIDTH_OP (1024 * 1000)
 108 #define MAX_NICKNAME_LEN 32
 109 #define MAX_DIR_SIZE 50000 /* XXX, big enough? */
 110
 111 #define MAX_DNS_ENTRY_AGE (15*60)
 112
 113 #define CIRC_ID_TYPE_LOWER 0
 114 #define CIRC_ID_TYPE_HIGHER 1
 115
 116 #define _CONN_TYPE_MIN 3
 117 #define CONN_TYPE_OR_LISTENER 3
 118 #define CONN_TYPE_OR 4
 119 #define CONN_TYPE_EXIT 5
 120 #define CONN_TYPE_AP_LISTENER 6
 121 #define CONN_TYPE_AP 7
 122 #define CONN_TYPE_DIR_LISTENER 8
 123 #define CONN_TYPE_DIR 9
 124 #define CONN_TYPE_DNSWORKER 10
 125 #define CONN_TYPE_CPUWORKER 11
 126 #define _CONN_TYPE_MAX 11
 127
 128 #define LISTENER_STATE_READY 0
 129
 130 #define _DNSWORKER_STATE_MIN 1
 131 #define DNSWORKER_STATE_IDLE 1
 132 #define DNSWORKER_STATE_BUSY 2
 133 #define _DNSWORKER_STATE_MAX 2
 134
 135 #define _CPUWORKER_STATE_MIN 1
 136 #define CPUWORKER_STATE_IDLE 1
 137 #define CPUWORKER_STATE_BUSY_ONION 2
 138 #define CPUWORKER_STATE_BUSY_HANDSHAKE 3
 139 #define _CPUWORKER_STATE_MAX 3
 140
 141 #define CPUWORKER_TASK_ONION CPUWORKER_STATE_BUSY_ONION
 142
 143 #define _OR_CONN_STATE_MIN 1
 144 #define OR_CONN_STATE_CONNECTING 1 /* waiting for connect() to finish */
 145 #define OR_CONN_STATE_HANDSHAKING 2 /* SSL is handshaking, not done yet */
 146 #define OR_CONN_STATE_OPEN 3 /* ready to send/receive cells. */
 147 #define _OR_CONN_STATE_MAX 3
 148
 149 #define _EXIT_CONN_STATE_MIN 1
 150 #define EXIT_CONN_STATE_RESOLVING 1 /* waiting for response from dns farm */
 151 #define EXIT_CONN_STATE_CONNECTING 2 /* waiting for connect() to finish */
 152 #define EXIT_CONN_STATE_OPEN 3
 153 #define _EXIT_CONN_STATE_MAX 3
 154 #if 0
 155 #define EXIT_CONN_STATE_CLOSE 3 /* flushing the buffer, then will close */
 156 #define EXIT_CONN_STATE_CLOSE_WAIT 4 /* have sent a destroy, awaiting a confirmation */
 157 #endif
 158
 159 /* the AP state values must be disjoint from the EXIT state values */
 160 #define _AP_CONN_STATE_MIN 4
 161 #define AP_CONN_STATE_SOCKS_WAIT 4
 162 #define AP_CONN_STATE_CIRCUIT_WAIT 5
 163 #define AP_CONN_STATE_OPEN 6
 164 #define _AP_CONN_STATE_MAX 6
 165
 166 #define _DIR_CONN_STATE_MIN 1
 167 #define DIR_CONN_STATE_CONNECTING_FETCH 1
 168 #define DIR_CONN_STATE_CONNECTING_UPLOAD 2
 169 #define DIR_CONN_STATE_CLIENT_SENDING_FETCH 3
 170 #define DIR_CONN_STATE_CLIENT_SENDING_UPLOAD 4
 171 #define DIR_CONN_STATE_CLIENT_READING_FETCH 5
 172 #define DIR_CONN_STATE_CLIENT_READING_UPLOAD 6
 173 #define DIR_CONN_STATE_SERVER_COMMAND_WAIT 7
 174 #define DIR_CONN_STATE_SERVER_WRITING 8
 175 #define _DIR_CONN_STATE_MAX 8
 176
 177 #define CIRCUIT_STATE_BUILDING 0 /* I'm the OP, still haven't done all my handshakes */
 178 #define CIRCUIT_STATE_ONIONSKIN_PENDING 1 /* waiting to process the onionskin */
 179 #define CIRCUIT_STATE_OR_WAIT 2 /* I'm the OP, my firsthop is still connecting */
 180 #define CIRCUIT_STATE_OPEN 3 /* onionskin(s) processed, ready to send/receive cells */
 181
 182 #define RELAY_COMMAND_BEGIN 1
 183 #define RELAY_COMMAND_DATA 2
 184 #define RELAY_COMMAND_END 3
 185 #define RELAY_COMMAND_CONNECTED 4
 186 #define RELAY_COMMAND_SENDME 5
 187 #define RELAY_COMMAND_EXTEND 6
 188 #define RELAY_COMMAND_EXTENDED 7
 189 #define RELAY_COMMAND_TRUNCATE 8
 190 #define RELAY_COMMAND_TRUNCATED 9
 191 #define RELAY_COMMAND_DROP 10
 192
 193 #define RELAY_HEADER_SIZE 8
 194
 195 #define END_STREAM_REASON_MISC 1
 196 #define END_STREAM_REASON_RESOLVEFAILED 2
 197 #define END_STREAM_REASON_CONNECTFAILED 3
 198 #define END_STREAM_REASON_EXITPOLICY 4
 199 #define END_STREAM_REASON_DESTROY 5
 200 #define END_STREAM_REASON_DONE 6
 201
 202 /* default cipher function */
 203 #define DEFAULT_CIPHER CRYPTO_CIPHER_AES_CTR
 204 /* Used to en/decrypt onion skins */
 205 #define ONION_CIPHER      DEFAULT_CIPHER
 206 /* Used to en/decrypt RELAY cells */
 207 #define CIRCUIT_CIPHER    DEFAULT_CIPHER
 208
 209 #define CELL_DIRECTION_IN 1
 210 #define CELL_DIRECTION_OUT 2
 211 #define EDGE_EXIT CONN_TYPE_EXIT
 212 #define EDGE_AP CONN_TYPE_AP
 213 #define CELL_DIRECTION(x) ((x) == EDGE_EXIT ? CELL_DIRECTION_IN : CELL_DIRECTION_OUT)
 214
 215 #define CIRCWINDOW_START 1000
 216 #define CIRCWINDOW_INCREMENT 100
 217
 218 #define STREAMWINDOW_START 500
 219 #define STREAMWINDOW_INCREMENT 50
 220
 221 /* cell commands */
 222 #define CELL_PADDING 0
 223 #define CELL_CREATE 1
 224 #define CELL_CREATED 2
 225 #define CELL_RELAY 3
 226 #define CELL_DESTROY 4
 227
 228 #define CELL_PAYLOAD_SIZE 248
 229 #define CELL_NETWORK_SIZE 256
 230
 231 /* legal characters in a filename */
 232 #define CONFIG_LEGAL_FILENAME_CHARACTERS "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-_/"
 233 /* legal characters in a nickname */
 234 #define LEGAL_NICKNAME_CHARACTERS "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
 235
 236 #define SOCKS4_NETWORK_LEN 8
 237
 238 typedef uint16_t circ_id_t;
 239
 240 /* cell definition */
 241 typedef struct {
 242   circ_id_t circ_id;
 243   unsigned char command;
 244   unsigned char length; /* of payload if relay cell */
 245   uint32_t seq; /* sequence number */
 246
 247   unsigned char payload[CELL_PAYLOAD_SIZE];
 248 } cell_t;
 249 #define CELL_RELAY_COMMAND(c)         (*(uint8_t*)((c).payload))
 250 #define SET_CELL_RELAY_COMMAND(c,cmd) (*(uint8_t*)((c).payload) = (cmd))
 251 #define STREAM_ID_SIZE 7
 252 #define SET_CELL_STREAM_ID(c,id)      memcpy((c).payload+1,(id),STREAM_ID_SIZE)
 253 #define CELL_RELAY_COMMAND_END_REASON(c) (*(uint8_t)((c).payload+1))
 254
 255 #define ZERO_STREAM "\0\0\0\0\0\0\0\0"
 256
 257 typedef struct buf_t buf_t;
 258 typedef struct socks_request_t socks_request_t;
 259
 260 struct connection_t {
 261
 262   uint8_t type;
 263   uint8_t state;
 264   uint8_t wants_to_read; /* should we start reading again once
 265                           * the bandwidth throttler allows it?
 266                           */
 267   uint8_t wants_to_write; /* should we start writing again once
 268                            * the bandwidth throttler allows reads?
 269                            */
 270   int s; /* our socket */
 271   int poll_index; /* index of this conn into the poll_array */
 272   int marked_for_close; /* should we close this conn on the next
 273                          * iteration of the main loop?
 274                          */
 275
 276   buf_t *inbuf;
 277   int inbuf_reached_eof; /* did read() return 0 on this conn? */
 278   time_t timestamp_lastread; /* when was the last time poll() said we could read? */
 279
 280   buf_t *outbuf;
 281   int outbuf_flushlen; /* how much data should we try to flush from the outbuf? */
 282   time_t timestamp_lastwritten; /* when was the last time poll() said we could write? */
 283
 284   time_t timestamp_created; /* when was this connection_t created? */
 285
 286   uint32_t addr; /* these two uniquely identify a router. Both in host order. */
 287   uint16_t port; /* if non-zero, they identify the guy on the other end
 288                   * of the connection. */
 289   char *address; /* FQDN (or IP) of the guy on the other end.
 290                   * strdup into this, because free_connection frees it
 291                   */
 292   crypto_pk_env_t *onion_pkey; /* public RSA key for the other side's onions */
 293   crypto_pk_env_t *link_pkey; /* public RSA key for the other side's TLS */
 294   crypto_pk_env_t *identity_pkey; /* public RSA key for the other side's signing */
 295   char *nickname;
 296
 297 /* Used only by OR connections: */
 298   tor_tls *tls;
 299   circ_id_t next_circ_id; /* Which circ_id do we try to use next on this connection?
 300                            * This is always in the range 0..1<<15-1.*/
 301
 302   /* bandwidth and receiver_bucket only used by ORs in OPEN state: */
 303   uint32_t bandwidth; /* connection bandwidth. */
 304   int receiver_bucket; /* when this hits 0, stop receiving. Every second we
 305                         * add 'bandwidth' to this, capping it at 10*bandwidth.
 306                         */
 307
 308 /* Used only by edge connections: */
 309   char stream_id[STREAM_ID_SIZE];
 310   struct connection_t *next_stream; /* points to the next stream at this edge, if any */
 311   struct crypt_path_t *cpath_layer; /* a pointer to which node in the circ this conn exits at */
 312   int package_window; /* how many more relay cells can i send into the circuit? */
 313   int deliver_window; /* how many more relay cells can end at me? */
 314
 315   int done_sending; /* for half-open connections; not used currently */
 316   int done_receiving;
 317   char has_sent_end; /* for debugging: set once we've set the stream end,
 318                         and check in circuit_about_to_close_connection() */
 319
 320   /* Used only by AP connections */
 321   socks_request_t *socks_request;
 322 };
 323
 324 typedef struct connection_t connection_t;
 325
 326 #define EXIT_POLICY_ACCEPT 1
 327 #define EXIT_POLICY_REJECT 2
 328
 329 struct exit_policy_t {
 330   char policy_type;
 331   char *string;
 332   uint32_t addr;
 333   uint32_t msk;
 334   uint16_t prt_min;
 335   uint16_t prt_max;
 336
 337   struct exit_policy_t *next;
 338 };
 339
 340 /* config stuff we know about the other ORs in the network */
 341 typedef struct {
 342   char *address;
 343   char *nickname;
 344
 345   uint32_t addr; /* all host order */
 346   uint16_t or_port;
 347   uint16_t socks_port;
 348   uint16_t dir_port;
 349
 350   time_t published_on;
 351
 352   crypto_pk_env_t *onion_pkey; /* public RSA key for onions */
 353   crypto_pk_env_t *link_pkey;  /* public RSA key for TLS */
 354   crypto_pk_env_t *identity_pkey;  /* public RSA key for signing */
 355
 356   int is_running;
 357
 358   /* link info */
 359   uint32_t bandwidth;
 360   struct exit_policy_t *exit_policy;
 361 } routerinfo_t;
 362
 363 #define MAX_ROUTERS_IN_DIR 1024
 364 typedef struct {
 365   routerinfo_t **routers;
 366   int n_routers;
 367   char *software_versions;
 368   time_t published_on;
 369 } routerlist_t;
 370
 371 struct crypt_path_t {
 372
 373   /* crypto environments */
 374   crypto_cipher_env_t *f_crypto;
 375   crypto_cipher_env_t *b_crypto;
 376
 377   crypto_dh_env_t *handshake_state;
 378
 379   uint32_t addr;
 380   uint16_t port;
 381
 382   uint8_t state;
 383 #define CPATH_STATE_CLOSED 0
 384 #define CPATH_STATE_AWAITING_KEYS 1
 385 #define CPATH_STATE_OPEN 2
 386   struct crypt_path_t *next;
 387   struct crypt_path_t *prev; /* doubly linked list */
 388
 389   int package_window;
 390   int deliver_window;
 391 };
 392
 393 #define DH_KEY_LEN CRYPTO_DH_SIZE
 394 #define DH_ONIONSKIN_LEN DH_KEY_LEN+16
 395
 396 typedef struct crypt_path_t crypt_path_t;
 397
 398 typedef struct {
 399   int desired_path_len;
 400   char *chosen_exit; /* nickname of planned exit node */
 401 } cpath_build_state_t;
 402
 403 /* struct for a path (circuit) through the network */
 404 struct circuit_t {
 405   uint32_t n_addr;
 406   uint16_t n_port;
 407   connection_t *p_conn;
 408   connection_t *n_conn; /* for the OR conn, if there is one */
 409   connection_t *p_streams;
 410   connection_t *n_streams;
 411   int package_window;
 412   int deliver_window;
 413
 414   circ_id_t p_circ_id; /* circuit identifiers */
 415   circ_id_t n_circ_id;
 416
 417   crypto_cipher_env_t *p_crypto; /* used only for intermediate hops */
 418   crypto_cipher_env_t *n_crypto;
 419
 420   cpath_build_state_t *build_state;
 421   crypt_path_t *cpath;
 422
 423   char onionskin[DH_ONIONSKIN_LEN]; /* for storage while onionskin pending */
 424   time_t timestamp_created;
 425   time_t timestamp_dirty; /* when the circuit was first used, or 0 if clean */
 426
 427   uint8_t state;
 428
 429   void *next;
 430 };
 431
 432 typedef struct circuit_t circuit_t;
 433
 434 typedef struct {
 435   char *LogLevel;
 436   char *LogFile;
 437   char *DebugLogFile;
 438   char *DataDirectory;
 439   char *RouterFile;
 440   char *Nickname;
 441   char *Address;
 442   char *PidFile;
 443   char *ExitNodes;
 444   char *EntryNodes;
 445   char *ExcludedNodes;
 446   char *ExitPolicy;
 447   char *SocksBindAddress;
 448   char *ORBindAddress;
 449   char *DirBindAddress;
 450   char *RecommendedVersions;
 451   char *User;
 452   char *Group;
 453   double PathlenCoinWeight;
 454   int ORPort;
 455   int SocksPort;
 456   int DirPort;
 457   int MaxConn;
 458   int TrafficShaping;
 459   int LinkPadding;
 460   int IgnoreVersion;
 461   int RunAsDaemon;
 462   int DirRebuildPeriod;
 463   int DirFetchPostPeriod;
 464   int KeepalivePeriod;
 465   int MaxOnionsPending;
 466   int NewCircuitPeriod;
 467   int TotalBandwidth;
 468   int NumCpus;
 469   int loglevel;
 470 } or_options_t;
 471
 472 #define MAX_SOCKS_REPLY_LEN 256
 473 /* Not 256; addresses must fit in a begin cell. */
 474 #define MAX_SOCKS_ADDR_LEN 200
 475 struct socks_request_t {
 476   char socks_version;
 477   int replylen;
 478   char reply[MAX_SOCKS_REPLY_LEN];
 479   char address[MAX_SOCKS_ADDR_LEN];
 480   uint16_t port;
 481 };
 482
 483 /* all the function prototypes go here */
 484
 485 /********************************* buffers.c ***************************/
 486
 487 int find_on_inbuf(char *string, int string_len, buf_t *buf);
 488
 489 buf_t *buf_new();
 490 buf_t *buf_new_with_capacity(size_t size);
 491 void buf_free(buf_t *buf);
 492
 493 size_t buf_datalen(const buf_t *buf);
 494 size_t buf_capacity(const buf_t *buf);
 495 const char *_buf_peek_raw_buffer(const buf_t *buf);
 496
 497 int read_to_buf(int s, int at_most, buf_t *buf, int *reached_eof);
 498 int read_to_buf_tls(tor_tls *tls, int at_most, buf_t *buf);
 499
 500 int flush_buf(int s, buf_t *buf, int *buf_flushlen);
 501 int flush_buf_tls(tor_tls *tls, buf_t *buf, int *buf_flushlen);
 502
 503 int write_to_buf(const char *string, int string_len, buf_t *buf);
 504 int fetch_from_buf(char *string, int string_len, buf_t *buf);
 505 int fetch_from_buf_http(buf_t *buf,
 506                         char *headers_out, int max_headerlen,
 507                         char *body_out, int max_bodylen);
 508 int fetch_from_buf_socks(buf_t *buf, socks_request_t *req);
 509
 510 /********************************* circuit.c ***************************/
 511
 512 void circuit_add(circuit_t *circ);
 513 void circuit_remove(circuit_t *circ);
 514 circuit_t *circuit_new(circ_id_t p_circ_id, connection_t *p_conn);
 515 void circuit_free(circuit_t *circ);
 516 void circuit_free_cpath(crypt_path_t *cpath);
 517
 518 circuit_t *circuit_get_by_circ_id_conn(circ_id_t circ_id, connection_t *conn);
 519 circuit_t *circuit_get_by_conn(connection_t *conn);
 520 circuit_t *circuit_get_newest(connection_t *conn, int must_be_open);
 521
 522 void circuit_expire_building(void);
 523 int circuit_count_building(void);
 524 int circuit_stream_is_being_handled(connection_t *conn);
 525
 526 int circuit_deliver_relay_cell(cell_t *cell, circuit_t *circ,
 527                                int cell_direction, crypt_path_t *layer_hint);
 528 int relay_crypt(circuit_t *circ, char *in, int inlen, char cell_direction,
 529                 crypt_path_t **layer_hint, char *recognized, connection_t **conn);
 530 int relay_check_recognized(circuit_t *circ, int cell_direction, char *stream, connection_t **conn);
 531
 532 void circuit_resume_edge_reading(circuit_t *circ, int edge_type, crypt_path_t *layer_hint);
 533 int circuit_consider_stop_edge_reading(circuit_t *circ, int edge_type, crypt_path_t *layer_hint);
 534 int circuit_consider_sending_sendme(circuit_t *circ, int edge_type, crypt_path_t *layer_hint);
 535
 536 void circuit_close(circuit_t *circ);
 537 void circuit_about_to_close_connection(connection_t *conn);
 538
 539 void circuit_dump_by_conn(connection_t *conn, int severity);
 540
 541 void circuit_expire_unused_circuits(void);
 542 int circuit_launch_new(void);
 543 void circuit_increment_failure_count(void);
 544 void circuit_reset_failure_count(void);
 545 int circuit_establish_circuit(void);
 546 void circuit_n_conn_open(connection_t *or_conn);
 547 int circuit_send_next_onion_skin(circuit_t *circ);
 548 int circuit_extend(cell_t *cell, circuit_t *circ);
 549 int circuit_finish_handshake(circuit_t *circ, char *reply);
 550 int circuit_truncated(circuit_t *circ, crypt_path_t *layer);
 551
 552 void assert_cpath_ok(const crypt_path_t *c);
 553 void assert_cpath_layer_ok(const crypt_path_t *c);
 554 void assert_circuit_ok(const circuit_t *c);
 555
 556 extern unsigned long stats_n_relay_cells_relayed;
 557 extern unsigned long stats_n_relay_cells_delivered;
 558
 559 /********************************* command.c ***************************/
 560
 561 void command_process_cell(cell_t *cell, connection_t *conn);
 562
 563 extern unsigned long stats_n_padding_cells_processed;
 564 extern unsigned long stats_n_create_cells_processed;
 565 extern unsigned long stats_n_created_cells_processed;
 566 extern unsigned long stats_n_relay_cells_processed;
 567 extern unsigned long stats_n_destroy_cells_processed;
 568
 569 /********************************* config.c ***************************/
 570
 571 int getconfig(int argc, char **argv, or_options_t *options);
 572
 573 /********************************* connection.c ***************************/
 574
 575 connection_t *connection_new(int type);
 576 void connection_free(connection_t *conn);
 577
 578 int connection_create_listener(char *bindaddress, uint16_t bindport, int type);
 579
 580 int connection_connect(connection_t *conn, char *address, uint32_t addr, uint16_t port);
 581 int retry_all_connections(void);
 582
 583 int connection_handle_read(connection_t *conn);
 584 int connection_read_to_buf(connection_t *conn);
 585
 586 int connection_fetch_from_buf(char *string, int len, connection_t *conn);
 587 int connection_find_on_inbuf(char *string, int len, connection_t *conn);
 588
 589 int connection_wants_to_flush(connection_t *conn);
 590 int connection_outbuf_too_full(connection_t *conn);
 591 int connection_handle_write(connection_t *conn);
 592 void connection_write_to_buf(const char *string, int len, connection_t *conn);
 593
 594 connection_t *connection_twin_get_by_addr_port(uint32_t addr, uint16_t port);
 595 connection_t *connection_exact_get_by_addr_port(uint32_t addr, uint16_t port);
 596
 597 connection_t *connection_get_by_type(int type);
 598 connection_t *connection_get_by_type_state(int type, int state);
 599 connection_t *connection_get_by_type_state_lastwritten(int type, int state);
 600
 601 int connection_receiver_bucket_should_increase(connection_t *conn);
 602
 603 #define connection_speaks_cells(conn) ((conn)->type == CONN_TYPE_OR)
 604 #define connection_has_pending_tls_data(conn) \
 605   ((conn)->type == CONN_TYPE_OR && \
 606    (conn)->state == OR_CONN_STATE_OPEN && \
 607    tor_tls_get_pending_bytes(conn->tls))
 608 int connection_is_listener(connection_t *conn);
 609 int connection_state_is_open(connection_t *conn);
 610
 611 int connection_send_destroy(circ_id_t circ_id, connection_t *conn);
 612
 613 int connection_process_inbuf(connection_t *conn);
 614 int connection_finished_flushing(connection_t *conn);
 615
 616 void assert_connection_ok(connection_t *conn, time_t now);
 617
 618 /********************************* connection_edge.c ***************************/
 619
 620 int connection_edge_process_inbuf(connection_t *conn);
 621 int connection_edge_end(connection_t *conn, char reason, crypt_path_t *cpath_layer);
 622
 623 int connection_edge_send_command(connection_t *fromconn, circuit_t *circ, int relay_command,
 624                                  void *payload, int payload_len, crypt_path_t *cpath_layer);
 625
 626 int connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, connection_t *conn,
 627                                        int edge_type, crypt_path_t *layer_hint);
 628 int connection_edge_finished_flushing(connection_t *conn);
 629
 630 int connection_edge_package_raw_inbuf(connection_t *conn);
 631
 632 void connection_exit_connect(connection_t *conn);
 633 int connection_ap_can_use_exit(connection_t *conn, routerinfo_t *exit);
 634 void connection_ap_attach_pending(void);
 635
 636 extern uint64_t stats_n_data_cells_packaged;
 637 extern uint64_t stats_n_data_bytes_packaged;
 638 extern uint64_t stats_n_data_cells_received;
 639 extern uint64_t stats_n_data_bytes_received;
 640
 641 void client_dns_init(void);
 642 void client_dns_clean(void);
 643
 644 /********************************* connection_or.c ***************************/
 645
 646 int connection_or_process_inbuf(connection_t *conn);
 647 int connection_or_finished_flushing(connection_t *conn);
 648
 649 void connection_or_init_conn_from_router(connection_t *conn, routerinfo_t *router);
 650 connection_t *connection_or_connect(routerinfo_t *router);
 651
 652 int connection_tls_start_handshake(connection_t *conn, int receiving);
 653 int connection_tls_continue_handshake(connection_t *conn);
 654
 655 void connection_or_write_cell_to_buf(const cell_t *cellp, connection_t *conn);
 656
 657 /********************************* cpuworker.c *****************************/
 658
 659 void cpu_init(void);
 660 int connection_cpu_finished_flushing(connection_t *conn);
 661 int connection_cpu_process_inbuf(connection_t *conn);
 662 int cpuworker_main(void *data);
 663 int assign_to_cpuworker(connection_t *cpuworker, unsigned char question_type,
 664                         void *task);
 665
 666 /********************************* directory.c ***************************/
 667
 668 void directory_initiate_command(routerinfo_t *router, int command);
 669 int connection_dir_process_inbuf(connection_t *conn);
 670 int connection_dir_finished_flushing(connection_t *conn);
 671
 672 /********************************* dns.c ***************************/
 673
 674 void dns_init(void);
 675 int connection_dns_finished_flushing(connection_t *conn);
 676 int connection_dns_process_inbuf(connection_t *conn);
 677 void dns_cancel_pending_resolve(char *question, connection_t *onlyconn);
 678 int dns_resolve(connection_t *exitconn);
 679
 680 /********************************* main.c ***************************/
 681
 682 int connection_add(connection_t *conn);
 683 int connection_remove(connection_t *conn);
 684 void connection_set_poll_socket(connection_t *conn);
 685
 686 void get_connection_array(connection_t ***array, int *n);
 687
 688 void connection_watch_events(connection_t *conn, short events);
 689 int connection_is_reading(connection_t *conn);
 690 void connection_stop_reading(connection_t *conn);
 691 void connection_start_reading(connection_t *conn);
 692 void connection_stop_writing(connection_t *conn);
 693 void connection_start_writing(connection_t *conn);
 694
 695 int main(int argc, char *argv[]);
 696
 697 /********************************* onion.c ***************************/
 698
 699 int decide_circ_id_type(char *local_nick, char *remote_nick);
 700
 701 int onion_pending_add(circuit_t *circ);
 702 circuit_t *onion_next_task(void);
 703 void onion_pending_remove(circuit_t *circ);
 704
 705 int onionskin_answer(circuit_t *circ, unsigned char *payload, unsigned char *keys);
 706
 707 int onion_extend_cpath(crypt_path_t **head_ptr, cpath_build_state_t *state,
 708                        routerinfo_t **router_out);
 709
 710 int onion_skin_create(crypto_pk_env_t *router_key,
 711                       crypto_dh_env_t **handshake_state_out,
 712                       char *onion_skin_out); /* Must be DH_ONIONSKIN_LEN bytes long */
 713
 714 int onion_skin_server_handshake(char *onion_skin, /* DH_ONIONSKIN_LEN bytes long */
 715                                 crypto_pk_env_t *private_key,
 716                                 char *handshake_reply_out, /* DH_KEY_LEN bytes long */
 717                                 char *key_out,
 718                                 int key_out_len);
 719
 720 int onion_skin_client_handshake(crypto_dh_env_t *handshake_state,
 721                              char *handshake_reply,/* Must be DH_KEY_LEN bytes long*/
 722                              char *key_out,
 723                              int key_out_len);
 724
 725 cpath_build_state_t *onion_new_cpath_build_state(void);
 726
 727 /********************************* router.c ***************************/
 728
 729 void set_onion_key(crypto_pk_env_t *k);
 730 crypto_pk_env_t *get_onion_key(void);
 731 void set_identity_key(crypto_pk_env_t *k);
 732 crypto_pk_env_t *get_identity_key(void);
 733 crypto_pk_env_t *get_link_key(void);
 734 int init_keys(void);
 735
 736 void router_retry_connections(void);
 737 void router_upload_desc_to_dirservers(void);
 738 int router_compare_to_my_exit_policy(connection_t *conn);
 739 const char *router_get_my_descriptor(void);
 740 int router_rebuild_descriptor(void);
 741 int router_dump_router_to_string(char *s, int maxlen, routerinfo_t *router,
 742                                  crypto_pk_env_t *ident_key);
 743
 744 /********************************* routerlist.c ***************************/
 745
 746 routerinfo_t *router_pick_directory_server(void);
 747 routerinfo_t *router_get_by_addr_port(uint32_t addr, uint16_t port);
 748 routerinfo_t *router_get_by_link_pk(crypto_pk_env_t *pk);
 749 routerinfo_t *router_get_by_nickname(char *nickname);
 750 void router_get_routerlist(routerlist_t **prouterlist);
 751 void routerinfo_free(routerinfo_t *router);
 752 void router_mark_as_down(char *nickname);
 753 int router_set_routerlist_from_file(char *routerfile);
 754 int router_get_dir_hash(const char *s, char *digest);
 755 int router_get_router_hash(const char *s, char *digest);
 756 int router_set_routerlist_from_directory(const char *s, crypto_pk_env_t *pkey);
 757 routerinfo_t *router_get_entry_from_string(const char **s);
 758 int router_add_exit_policy_from_string(routerinfo_t *router, const char *s);
 759 int router_supports_exit_address(uint32_t addr, uint16_t port,
 760                                  routerinfo_t *router);
 761 int router_compare_addr_to_exit_policy(uint32_t addr, uint16_t port,
 762                                        struct exit_policy_t *policy);
 763 int router_exit_policy_all_routers_reject(uint32_t addr, uint16_t port);
 764 int router_exit_policy_rejects_all(routerinfo_t *router);
 765
 766 /********************************* dirserv.c ***************************/
 767 int dirserv_add_own_fingerprint(const char *nickname, crypto_pk_env_t *pk);
 768 int dirserv_parse_fingerprint_file(const char *fname);
 769 int dirserv_router_fingerprint_is_known(const routerinfo_t *router);
 770 void dirserv_free_fingerprint_list();
 771 int dirserv_add_descriptor(const char **desc);
 772 int dirserv_init_from_directory_string(const char *dir);
 773 void dirserv_free_descriptors();
 774 int dirserv_dump_directory_to_string(char *s, int maxlen,
 775                                      crypto_pk_env_t *private_key);
 776 void directory_set_dirty();
 777 size_t dirserv_get_directory(const char **cp);
 778
 779
 780 #endif
 781
 782 /*
 783   Local Variables:
 784   mode:c
 785   indent-tabs-mode:nil
 786   c-basic-offset:2
 787   End:
 788 */