| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Main program |
| 4 | * |
| 5 | * (c) 2001 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of Trivial IP Encryption (TrIPE). |
| 11 | * |
| 12 | * TrIPE is free software: you can redistribute it and/or modify it under |
| 13 | * the terms of the GNU General Public License as published by the Free |
| 14 | * Software Foundation; either version 3 of the License, or (at your |
| 15 | * option) any later version. |
| 16 | * |
| 17 | * TrIPE is distributed in the hope that it will be useful, but WITHOUT |
| 18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 20 | * for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with TrIPE. If not, see <https://www.gnu.org/licenses/>. |
| 24 | */ |
| 25 | |
| 26 | /*----- Header files ------------------------------------------------------*/ |
| 27 | |
| 28 | #include "tripe.h" |
| 29 | |
| 30 | /*----- Global variables --------------------------------------------------*/ |
| 31 | |
| 32 | sel_state sel; |
| 33 | |
| 34 | /*----- Static variables --------------------------------------------------*/ |
| 35 | |
| 36 | static sel_timer it; |
| 37 | #define T_INTERVAL MIN(1) |
| 38 | |
| 39 | static unsigned iv_nreasons = 0; |
| 40 | static struct timeval iv_next = { 0, 0 }; |
| 41 | static int lpdone = 0; |
| 42 | |
| 43 | /*----- The interval timer ------------------------------------------------*/ |
| 44 | |
| 45 | /* --- @interval@ --- * |
| 46 | * |
| 47 | * Arguments: @struct timeval *tv@ = time when called |
| 48 | * @void *v@ = boring pointer |
| 49 | * |
| 50 | * Returns: --- |
| 51 | * |
| 52 | * Use: Called periodically to do housekeeping tasks. |
| 53 | */ |
| 54 | |
| 55 | static void interval(struct timeval *tv, void *v) |
| 56 | { |
| 57 | T( trace(T_PEER, "peer: interval timer"); ) |
| 58 | iv_next = *tv; |
| 59 | rand_seed(RAND_GLOBAL, MAXHASHSZ); |
| 60 | p_interval(); |
| 61 | iv_next.tv_sec += T_INTERVAL; |
| 62 | sel_addtimer(&sel, &it, &iv_next, interval, v); |
| 63 | } |
| 64 | |
| 65 | /* --- @iv_addreason@ --- * |
| 66 | * |
| 67 | * Arguments: --- |
| 68 | * |
| 69 | * Returns: --- |
| 70 | * |
| 71 | * Use: Adds an `interval timer reason'; if there are no others, the |
| 72 | * interval timer is engaged. |
| 73 | */ |
| 74 | |
| 75 | void iv_addreason(void) |
| 76 | { |
| 77 | struct timeval tv; |
| 78 | |
| 79 | if (!iv_nreasons) { |
| 80 | gettimeofday(&tv, 0); |
| 81 | if (TV_CMP(&tv, >=, &iv_next)) interval(&tv, 0); |
| 82 | else sel_addtimer(&sel, &it, &iv_next, interval, 0); |
| 83 | } |
| 84 | iv_nreasons++; |
| 85 | } |
| 86 | |
| 87 | /* --- @iv_rmreason@ --- * |
| 88 | * |
| 89 | * Arguments: --- |
| 90 | * |
| 91 | * Returns: --- |
| 92 | * |
| 93 | * Use: Removes an interval timer reason; if there are none left, the |
| 94 | * interval timer is disengaged. |
| 95 | */ |
| 96 | |
| 97 | void iv_rmreason(void) |
| 98 | { |
| 99 | assert(iv_nreasons); iv_nreasons--; |
| 100 | if (!iv_nreasons) sel_rmtimer(&it); |
| 101 | } |
| 102 | |
| 103 | /*----- The main loop -----------------------------------------------------*/ |
| 104 | |
| 105 | /* --- @lp_init@ --- * |
| 106 | * |
| 107 | * Arguments: --- |
| 108 | * |
| 109 | * Returns: --- |
| 110 | * |
| 111 | * Use: Initializes the main loop. Most importantly, this sets up |
| 112 | * the select multiplexor that everything else hooks onto. |
| 113 | */ |
| 114 | |
| 115 | void lp_init(void) |
| 116 | { |
| 117 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
| 118 | rand_seed(RAND_GLOBAL, MAXHASHSZ); |
| 119 | gettimeofday(&iv_next, 0); iv_next.tv_sec += T_INTERVAL; |
| 120 | signal(SIGPIPE, SIG_IGN); |
| 121 | sel_init(&sel); |
| 122 | sig_init(&sel); |
| 123 | } |
| 124 | |
| 125 | /* --- @lp_end@ --- * |
| 126 | * |
| 127 | * Arguments: --- |
| 128 | * |
| 129 | * Returns: --- |
| 130 | * |
| 131 | * Use: Requests an exit from the main loop. |
| 132 | */ |
| 133 | |
| 134 | void lp_end(void) { lpdone = 1; } |
| 135 | |
| 136 | /* --- @lp_run@ --- * |
| 137 | * |
| 138 | * Arguments: --- |
| 139 | * |
| 140 | * Returns: Zero on successful termination; @-1@ if things went wrong. |
| 141 | * |
| 142 | * Use: Cranks the main loop until it should be cranked no more. |
| 143 | */ |
| 144 | |
| 145 | int lp_run(void) |
| 146 | { |
| 147 | int nerr = 0; |
| 148 | |
| 149 | for (;;) { |
| 150 | a_preselect(); |
| 151 | if (lpdone) break; |
| 152 | if (!sel_select(&sel)) nerr = 0; |
| 153 | else if (errno != EINTR && errno != EAGAIN) { |
| 154 | a_warn("SERVER", "select-error", "?ERRNO", A_END); |
| 155 | nerr++; |
| 156 | if (nerr > 8) { |
| 157 | a_warn("ABORT", "repeated-select-errors", A_END); |
| 158 | abort(); |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | lpdone = 0; |
| 163 | return (0); |
| 164 | } |
| 165 | |
| 166 | /*----- Main code ---------------------------------------------------------*/ |
| 167 | |
| 168 | /* --- @main@ --- * |
| 169 | * |
| 170 | * Arguments: @int argc@ = number of command line arguments |
| 171 | * @char *argv[]@ = vector of arguments |
| 172 | * |
| 173 | * Returns: Zero if OK, nonzero on error. |
| 174 | * |
| 175 | * Use: Main program. Provides a simple VPN. |
| 176 | */ |
| 177 | |
| 178 | static void usage(FILE *fp) |
| 179 | { |
| 180 | pquis(fp, "Usage: $ [-DF] [-d DIR] [-b ADDR] [-p PORT] [-n TUNNEL]\n\ |
| 181 | [-U USER] [-G GROUP] [-a SOCKET] [-m MODE] [-T TRACE-OPTS]\n\ |
| 182 | [-k PRIV-KEYRING] [-K PUB-KEYRING] [-t KEY-TAG]\n"); |
| 183 | } |
| 184 | |
| 185 | static void version(FILE *fp) { pquis(fp, "$, version " VERSION "\n"); } |
| 186 | |
| 187 | static void help(FILE *fp) |
| 188 | { |
| 189 | version(fp); |
| 190 | fputc('\n', fp); |
| 191 | usage(fp); |
| 192 | fputs("\n\ |
| 193 | Options:\n\ |
| 194 | \n\ |
| 195 | -h, --help Display this help text.\n\ |
| 196 | -v, --version Display version number.\n\ |
| 197 | -u, --usage Display pointless usage message.\n\ |
| 198 | --tunnels Display IP tunnel drivers and exit.\n\ |
| 199 | \n\ |
| 200 | -4, --ipv4 Transport over IPv4 only.\n\ |
| 201 | -6, --ipv6 Transport over IPv6 only.\n\ |
| 202 | -D, --daemon Run in the background.\n\ |
| 203 | -F, --foreground Quit when stdin reports end-of-file.\n\ |
| 204 | -d, --directory=DIR Switch to directory DIR [default " CONFIGDIR "].\n\ |
| 205 | -b, --bind-address=ADDR Bind UDP socket to this IP ADDR.\n\ |
| 206 | -p, --port=PORT Select UDP port to listen to " |
| 207 | "[default " STR(TRIPE_PORT) "].\n\ |
| 208 | -n, --tunnel=TUNNEL Seelect default tunnel driver.\n\ |
| 209 | -U, --setuid=USER Set uid to USER after initialization.\n\ |
| 210 | -G, --setgid=GROUP Set gid to GROUP after initialization.\n\ |
| 211 | -k, --priv-keyring=FILE Get private key from FILE.\n\ |
| 212 | -K, --pub-keyring=FILE Get public keys from FILE.\n\ |
| 213 | -t, --tag=KEYTAG Use private key labelled TAG.\n\ |
| 214 | -a, --admin-socket=FILE Use FILE as the adminstration socket.\n\ |
| 215 | -m, --admin-perms=MODE Permissions to set on admin socket [default 600].\n\ |
| 216 | " T( "\ |
| 217 | -T, --trace=OPTIONS Turn on tracing options.\n\ |
| 218 | " ) "\ |
| 219 | ", fp); |
| 220 | } |
| 221 | |
| 222 | int main(int argc, char *argv[]) |
| 223 | { |
| 224 | const char *kr_priv = "keyring", *kr_pub = "keyring.pub"; |
| 225 | const char *tag_priv = 0; |
| 226 | const char *csock = SOCKETDIR "/tripesock"; |
| 227 | int csockmode = 0600; |
| 228 | const char *dir = CONFIGDIR; |
| 229 | const char *p; |
| 230 | const char *bindhost = 0, *bindsvc = STR(TRIPE_PORT); |
| 231 | struct addrinfo aihint = { 0 }, *ailist; |
| 232 | unsigned f = 0; |
| 233 | int i; |
| 234 | int err; |
| 235 | unsigned af; |
| 236 | uid_t u = -1; |
| 237 | gid_t g = -1; |
| 238 | |
| 239 | #define f_bogus 1u |
| 240 | #define f_daemon 2u |
| 241 | #define f_foreground 4u |
| 242 | |
| 243 | ego(argv[0]); |
| 244 | T( trace_on(stderr, 0); ) |
| 245 | |
| 246 | if ((p = getenv("TRIPEDIR")) != 0) |
| 247 | dir = p; |
| 248 | if ((p = getenv("TRIPESOCK")) != 0) |
| 249 | csock = p; |
| 250 | tun_default = tunnels[0]; |
| 251 | aihint.ai_family = AF_UNSPEC; |
| 252 | |
| 253 | for (;;) { |
| 254 | static const struct option opts[] = { |
| 255 | { "help", 0, 0, 'h' }, |
| 256 | { "version", 0, 0, 'v' }, |
| 257 | { "usage", 0, 0, 'u' }, |
| 258 | { "tunnels", 0, 0, '0' }, |
| 259 | |
| 260 | { "ipv4", 0, 0, '4' }, |
| 261 | { "ipv6", 0, 0, '6' }, |
| 262 | { "daemon", 0, 0, 'D' }, |
| 263 | { "foreground", 0, 0, 'F' }, |
| 264 | { "uid", OPTF_ARGREQ, 0, 'U' }, |
| 265 | { "setuid", OPTF_ARGREQ, 0, 'U' }, |
| 266 | { "gid", OPTF_ARGREQ, 0, 'G' }, |
| 267 | { "setgid", OPTF_ARGREQ, 0, 'G' }, |
| 268 | { "bind-address", OPTF_ARGREQ, 0, 'b' }, |
| 269 | { "tunnel", OPTF_ARGREQ, 0, 'n' }, |
| 270 | { "port", OPTF_ARGREQ, 0, 'p' }, |
| 271 | { "directory", OPTF_ARGREQ, 0, 'd' }, |
| 272 | { "priv-keyring", OPTF_ARGREQ, 0, 'k' }, |
| 273 | { "pub-keyring", OPTF_ARGREQ, 0, 'K' }, |
| 274 | { "tag", OPTF_ARGREQ, 0, 't' }, |
| 275 | { "admin-socket", OPTF_ARGREQ, 0, 'a' }, |
| 276 | { "admin-perms", OPTF_ARGREQ, 0, 'm' }, |
| 277 | #ifndef NTRACE |
| 278 | { "trace", OPTF_ARGREQ, 0, 'T' }, |
| 279 | #endif |
| 280 | |
| 281 | { 0, 0, 0, 0 } |
| 282 | }; |
| 283 | |
| 284 | i = mdwopt(argc, argv, "hvu46DFU:G:b:n:p:d:k:K:t:a:m:" T("T:"), |
| 285 | opts, 0, 0, 0); |
| 286 | if (i < 0) |
| 287 | break; |
| 288 | switch (i) { |
| 289 | case 'h': |
| 290 | help(stdout); |
| 291 | exit(0); |
| 292 | case 'v': |
| 293 | version(stdout); |
| 294 | exit(0); |
| 295 | case 'u': |
| 296 | usage(stdout); |
| 297 | exit(0); |
| 298 | |
| 299 | case '4': |
| 300 | aihint.ai_family = AF_INET; |
| 301 | break; |
| 302 | case '6': |
| 303 | aihint.ai_family = AF_INET6; |
| 304 | break; |
| 305 | case 'D': |
| 306 | f |= f_daemon; |
| 307 | break; |
| 308 | case 'U': |
| 309 | u = u_getuser(optarg, &g); |
| 310 | break; |
| 311 | case 'G': |
| 312 | g = u_getgroup(optarg); |
| 313 | break; |
| 314 | case 'F': |
| 315 | f |= f_foreground; |
| 316 | break; |
| 317 | |
| 318 | case 'b': |
| 319 | bindhost = optarg; |
| 320 | break; |
| 321 | case 'p': |
| 322 | bindsvc = optarg; |
| 323 | break; |
| 324 | case 'n': { |
| 325 | int i; |
| 326 | for (i = 0;; i++) { |
| 327 | if (!tunnels[i]) |
| 328 | die(EXIT_FAILURE, "unknown tunnel `%s'", optarg); |
| 329 | if (mystrieq(optarg, tunnels[i]->name)) |
| 330 | break; |
| 331 | } |
| 332 | tun_default = tunnels[i]; |
| 333 | } break; |
| 334 | case 'd': |
| 335 | dir = optarg; |
| 336 | break; |
| 337 | case 'k': |
| 338 | kr_priv = optarg; |
| 339 | break; |
| 340 | case 'K': |
| 341 | kr_pub = optarg; |
| 342 | break; |
| 343 | case 'a': |
| 344 | csock = optarg; |
| 345 | break; |
| 346 | case 'm': { |
| 347 | char *p; |
| 348 | csockmode = strtol(optarg, &p, 8); |
| 349 | if (*p) die(EXIT_FAILURE, "bad permissions: `%s'", optarg); |
| 350 | } break; |
| 351 | case 't': |
| 352 | tag_priv = optarg; |
| 353 | break; |
| 354 | #ifndef NTRACE |
| 355 | case 'T': |
| 356 | tr_flags = traceopt(tr_opts, optarg, tr_flags, 0); |
| 357 | trace_level(tr_flags); |
| 358 | break; |
| 359 | #endif |
| 360 | case '0': { |
| 361 | int i; |
| 362 | for (i = 0; tunnels[i]; i++) |
| 363 | puts(tunnels[i]->name); |
| 364 | exit(0); |
| 365 | } break; |
| 366 | default: |
| 367 | f |= f_bogus; |
| 368 | break; |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | if (optind < argc || (f & f_bogus)) { |
| 373 | usage(stderr); |
| 374 | exit(EXIT_FAILURE); |
| 375 | } |
| 376 | if (!(~f & (f_daemon | f_foreground))) |
| 377 | die(EXIT_FAILURE, "foreground operation for a daemon is silly"); |
| 378 | |
| 379 | aihint.ai_protocol = IPPROTO_UDP; |
| 380 | aihint.ai_socktype = SOCK_DGRAM; |
| 381 | aihint.ai_flags = AI_PASSIVE | AI_ADDRCONFIG; |
| 382 | if ((err = getaddrinfo(bindhost, bindsvc, &aihint, &ailist)) != 0) { |
| 383 | die(EXIT_FAILURE, "couldn't resolve hostname %c%s%c, port `%s': %s", |
| 384 | bindhost ? '`' : '<', |
| 385 | bindhost ? bindhost : "nil", |
| 386 | bindhost ? '\'' : '>', |
| 387 | bindsvc, gai_strerror(err)); |
| 388 | } |
| 389 | |
| 390 | if (chdir(dir)) { |
| 391 | die(EXIT_FAILURE, "can't set current directory to `%s': %s", |
| 392 | dir, strerror(errno)); |
| 393 | } |
| 394 | |
| 395 | lp_init(); |
| 396 | |
| 397 | if (!(f & f_daemon)) { |
| 398 | af = AF_WARN; |
| 399 | #ifndef NTRACE |
| 400 | af |= AF_TRACE; |
| 401 | #endif |
| 402 | if (f & f_foreground) |
| 403 | af |= AF_FOREGROUND; |
| 404 | a_create(STDIN_FILENO, STDOUT_FILENO, af); |
| 405 | a_switcherr(); |
| 406 | } |
| 407 | |
| 408 | p_init(); |
| 409 | for (i = 0; tunnels[i]; i++) |
| 410 | tunnels[i]->init(); |
| 411 | p_bind(ailist); freeaddrinfo(ailist); |
| 412 | |
| 413 | for (i = 0; tunnels[i]; i++) { |
| 414 | if (tunnels[i]->flags&TUNF_PRIVOPEN) { |
| 415 | ps_split(f & f_daemon); |
| 416 | break; |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | a_init(); |
| 421 | a_signals(); |
| 422 | a_listen(csock, u, g, csockmode); |
| 423 | u_setugid(u, g); |
| 424 | km_init(kr_priv, kr_pub, tag_priv); |
| 425 | kx_init(); |
| 426 | if (f & f_daemon) { |
| 427 | if (daemonize()) { |
| 428 | a_warn("SERVER", "daemon-error", "?ERRNO", A_END); |
| 429 | exit(EXIT_FAILURE); |
| 430 | } |
| 431 | a_daemon(); |
| 432 | a_switcherr(); |
| 433 | } |
| 434 | |
| 435 | lp_run(); |
| 436 | |
| 437 | p_destroyall(); |
| 438 | a_unlisten(); |
| 439 | ps_quit(); |
| 440 | return (0); |
| 441 | } |
| 442 | |
| 443 | /*----- That's all, folks -------------------------------------------------*/ |