| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: tripe.c,v 1.11 2003/05/17 11:02:03 mdw Exp $ |
| 4 | * |
| 5 | * Main program |
| 6 | * |
| 7 | * (c) 2001 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of Trivial IP Encryption (TrIPE). |
| 13 | * |
| 14 | * TrIPE is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * TrIPE is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with TrIPE; if not, write to the Free Software Foundation, |
| 26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 27 | */ |
| 28 | |
| 29 | /*----- Revision history --------------------------------------------------* |
| 30 | * |
| 31 | * $Log: tripe.c,v $ |
| 32 | * Revision 1.11 2003/05/17 11:02:03 mdw |
| 33 | * Document the new `-b' option. |
| 34 | * |
| 35 | * Revision 1.10 2003/05/16 12:09:03 mdw |
| 36 | * Allow binding to a chosen address. |
| 37 | * |
| 38 | * Revision 1.9 2003/04/15 14:11:09 mdw |
| 39 | * Rationalize the behaviour of the `-G' and `-U' options. |
| 40 | * |
| 41 | * Revision 1.8 2002/01/13 17:28:29 mdw |
| 42 | * Don't turn tracing on if tracing is turned off (!). |
| 43 | * |
| 44 | * Revision 1.7 2002/01/13 17:14:05 mdw |
| 45 | * Don't include the tracing option in the help if not compiled in. |
| 46 | * |
| 47 | * Revision 1.6 2001/06/19 22:08:37 mdw |
| 48 | * Moved buffers to peer.c. |
| 49 | * |
| 50 | * Revision 1.5 2001/02/16 21:43:12 mdw |
| 51 | * Provide a more helpful usage message. |
| 52 | * |
| 53 | * Revision 1.4 2001/02/16 21:41:31 mdw |
| 54 | * Add a new buffer. |
| 55 | * |
| 56 | * Revision 1.3 2001/02/04 17:10:40 mdw |
| 57 | * Remove a debugging @abort@ call. |
| 58 | * |
| 59 | * Revision 1.2 2001/02/03 22:33:00 mdw |
| 60 | * Stuff more randomness into the pool in the interval timer. |
| 61 | * |
| 62 | * Revision 1.1 2001/02/03 20:26:37 mdw |
| 63 | * Initial checkin. |
| 64 | * |
| 65 | */ |
| 66 | |
| 67 | /*----- Header files ------------------------------------------------------*/ |
| 68 | |
| 69 | #include "tripe.h" |
| 70 | |
| 71 | /*----- Global variables --------------------------------------------------*/ |
| 72 | |
| 73 | sel_state sel; |
| 74 | |
| 75 | /*----- Static variables --------------------------------------------------*/ |
| 76 | |
| 77 | static sel_timer it; |
| 78 | #define T_INTERVAL MIN(1) |
| 79 | |
| 80 | /*----- Main code ---------------------------------------------------------*/ |
| 81 | |
| 82 | /* --- @interval@ --- * |
| 83 | * |
| 84 | * Arguments: @struct timeval *tv@ = time when called |
| 85 | * @void *v@ = boring pointer |
| 86 | * |
| 87 | * Returns: --- |
| 88 | * |
| 89 | * Use: Called periodically to do housekeeping tasks. |
| 90 | */ |
| 91 | |
| 92 | void interval(struct timeval *tv, void *v) |
| 93 | { |
| 94 | struct timeval tvv; |
| 95 | T( trace(T_PEER, "peer: interval timer"); ) |
| 96 | rand_seed(RAND_GLOBAL, HASHSZ); |
| 97 | p_interval(); |
| 98 | tvv = *tv; |
| 99 | tvv.tv_sec += T_INTERVAL; |
| 100 | sel_addtimer(&sel, &it, &tvv, interval, v); |
| 101 | } |
| 102 | |
| 103 | /* --- @main@ --- * |
| 104 | * |
| 105 | * Arguments: @int argc@ = number of command line arguments |
| 106 | * @char *argv[]@ = vector of arguments |
| 107 | * |
| 108 | * Returns: Zero if OK, nonzero on error. |
| 109 | * |
| 110 | * Use: Main program. Provides a simple VPN. |
| 111 | */ |
| 112 | |
| 113 | static void usage(FILE *fp) |
| 114 | { |
| 115 | pquis(fp, "Usage: $ [-D] [-d dir] [-b addr] [-p port]\n\ |
| 116 | [-U user] [-G group] [-a socket] [-T trace-opts]\n\ |
| 117 | [-k priv-keyring] [-K pub-keyring] [-t key-tag]\n"); |
| 118 | } |
| 119 | |
| 120 | static void version(FILE *fp) |
| 121 | { |
| 122 | pquis(fp, "$, version " VERSION "\n"); |
| 123 | } |
| 124 | |
| 125 | static void help(FILE *fp) |
| 126 | { |
| 127 | version(fp); |
| 128 | fputc('\n', fp); |
| 129 | usage(fp); |
| 130 | fputs("\n\ |
| 131 | Options:\n\ |
| 132 | \n\ |
| 133 | -h, --help Display this help text.\n\ |
| 134 | -v, --version Display version number.\n\ |
| 135 | -u, --usage Display pointless usage message.\n\ |
| 136 | \n\ |
| 137 | -D, --daemon Run in the background.\n\ |
| 138 | -d, --directory=DIR Switch to directory DIR (default $TRIPEDIR).\n\ |
| 139 | -b, --bind-address=ADDR Bind UDP socket to this IP ADDR.\n\ |
| 140 | -p, --port=PORT Select UDP port to listen to.\n\ |
| 141 | -U, --setuid=USER Set uid to USER after initialization.\n\ |
| 142 | -G, --setgid=GROUP Set gid to GROUP after initialization.\n\ |
| 143 | -k, --priv-keyring=FILE Get private key from FILE.\n\ |
| 144 | -K, --pub-keyring=FILE Get public keys from FILE.\n\ |
| 145 | -t, --tag=KEYTAG Use private key labelled TAG.\n\ |
| 146 | -a, --admin-socket=FILE Use FILE as the adminstration socket.\n\ |
| 147 | " T( "\ |
| 148 | -T, --trace=OPTIONS Turn on tracing options.\n\ |
| 149 | " ) "\ |
| 150 | ", fp); |
| 151 | } |
| 152 | |
| 153 | int main(int argc, char *argv[]) |
| 154 | { |
| 155 | const char *kr_priv = "keyring", *kr_pub = "keyring.pub"; |
| 156 | const char *tag_priv = "tripe-dh"; |
| 157 | const char *csock = "tripesock"; |
| 158 | const char *dir = "/var/lib/tripe"; |
| 159 | const char *p; |
| 160 | unsigned port = 0; |
| 161 | struct in_addr baddr = { INADDR_ANY }; |
| 162 | unsigned f = 0; |
| 163 | uid_t u = -1; |
| 164 | gid_t g = -1; |
| 165 | |
| 166 | #define f_bogus 1u |
| 167 | #define f_daemon 2u |
| 168 | |
| 169 | ego(argv[0]); |
| 170 | T( trace_on(stderr, 0); ) |
| 171 | |
| 172 | if ((p = getenv("TRIPEDIR")) != 0) |
| 173 | dir = p; |
| 174 | |
| 175 | for (;;) { |
| 176 | static const struct option opts[] = { |
| 177 | { "help", 0, 0, 'h' }, |
| 178 | { "version", 0, 0, 'v' }, |
| 179 | { "usage", 0, 0, 'u' }, |
| 180 | |
| 181 | { "daemon", 0, 0, 'D' }, |
| 182 | { "uid", OPTF_ARGREQ, 0, 'U' }, |
| 183 | { "setuid", OPTF_ARGREQ, 0, 'U' }, |
| 184 | { "gid", OPTF_ARGREQ, 0, 'G' }, |
| 185 | { "setgid", OPTF_ARGREQ, 0, 'G' }, |
| 186 | { "bind-address", OPTF_ARGREQ, 0, 'b' }, |
| 187 | { "port", OPTF_ARGREQ, 0, 'p' }, |
| 188 | { "directory", OPTF_ARGREQ, 0, 'd' }, |
| 189 | { "priv-keyring", OPTF_ARGREQ, 0, 'k' }, |
| 190 | { "pub-keyring", OPTF_ARGREQ, 0, 'K' }, |
| 191 | { "tag", OPTF_ARGREQ, 0, 't' }, |
| 192 | { "admin-socket", OPTF_ARGREQ, 0, 'a' }, |
| 193 | #ifndef NTRACE |
| 194 | { "trace", OPTF_ARGREQ, 0, 'T' }, |
| 195 | #endif |
| 196 | |
| 197 | { 0, 0, 0, 0 } |
| 198 | }; |
| 199 | |
| 200 | int i = mdwopt(argc, argv, "hvu DU:G: b:p:d:k:K:t:a:" T("T:"), |
| 201 | opts, 0, 0, 0); |
| 202 | if (i < 0) |
| 203 | break; |
| 204 | switch (i) { |
| 205 | case 'h': |
| 206 | help(stdout); |
| 207 | exit(0); |
| 208 | case 'v': |
| 209 | version(stdout); |
| 210 | exit(0); |
| 211 | case 'u': |
| 212 | usage(stdout); |
| 213 | exit(0); |
| 214 | |
| 215 | case 'D': |
| 216 | f |= f_daemon; |
| 217 | break; |
| 218 | case 'U': { |
| 219 | struct passwd *pw; |
| 220 | char *p; |
| 221 | unsigned long i = strtoul(optarg, &p, 0); |
| 222 | if (!*p) |
| 223 | pw = getpwuid(i); |
| 224 | else |
| 225 | pw = getpwnam(optarg); |
| 226 | if (!pw) |
| 227 | die(EXIT_FAILURE, "user `%s' not found", optarg); |
| 228 | u = pw->pw_uid; |
| 229 | if (g == -1) |
| 230 | g = pw->pw_gid; |
| 231 | } break; |
| 232 | case 'G': { |
| 233 | struct group *gr; |
| 234 | char *p; |
| 235 | unsigned long i = strtoul(optarg, &p, 0); |
| 236 | if (!*p) |
| 237 | gr = getgrgid(i); |
| 238 | else |
| 239 | gr = getgrnam(optarg); |
| 240 | if (!gr) |
| 241 | die(EXIT_FAILURE, "group `%s' not found", optarg); |
| 242 | g = gr->gr_gid; |
| 243 | } break; |
| 244 | |
| 245 | case 'b': { |
| 246 | struct hostent *h = gethostbyname(optarg); |
| 247 | if (!h) |
| 248 | die(EXIT_FAILURE, "unknown host name `%s'", optarg); |
| 249 | memcpy(&baddr, h->h_addr, sizeof(struct in_addr)); |
| 250 | } break; |
| 251 | case 'p': { |
| 252 | char *p; |
| 253 | unsigned long i = strtoul(optarg, &p, 0); |
| 254 | if (*p) { |
| 255 | struct servent *s = getservbyname(optarg, "udp"); |
| 256 | if (!s) |
| 257 | die(EXIT_FAILURE, "unknown service name `%s'", optarg); |
| 258 | i = ntohs(s->s_port); |
| 259 | } |
| 260 | if (i == 0 || i >= 65536) |
| 261 | die(EXIT_FAILURE, "bad port number %lu", i); |
| 262 | port = i; |
| 263 | } break; |
| 264 | case 'd': |
| 265 | dir = optarg; |
| 266 | break; |
| 267 | case 'k': |
| 268 | kr_priv = optarg; |
| 269 | break; |
| 270 | case 'K': |
| 271 | kr_pub = optarg; |
| 272 | break; |
| 273 | case 'a': |
| 274 | csock = optarg; |
| 275 | break; |
| 276 | case 't': |
| 277 | tag_priv = optarg; |
| 278 | break; |
| 279 | #ifndef NTRACE |
| 280 | case 'T': |
| 281 | tr_flags = traceopt(tr_opts, optarg, tr_flags, 0); |
| 282 | trace_level(tr_flags); |
| 283 | break; |
| 284 | #endif |
| 285 | default: |
| 286 | f |= f_bogus; |
| 287 | break; |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | if (optind < argc || (f & f_bogus)) { |
| 292 | usage(stderr); |
| 293 | exit(EXIT_FAILURE); |
| 294 | } |
| 295 | |
| 296 | if (chdir(dir)) { |
| 297 | die(EXIT_FAILURE, "can't set current directory to `%s': %s", |
| 298 | dir, strerror(errno)); |
| 299 | } |
| 300 | |
| 301 | sel_init(&sel); |
| 302 | sig_init(&sel); |
| 303 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
| 304 | rand_seed(RAND_GLOBAL, RMD160_HASHSZ); |
| 305 | signal(SIGPIPE, SIG_IGN); |
| 306 | tun_init(); |
| 307 | p_init(baddr, port); |
| 308 | if (!(f & f_daemon)) |
| 309 | a_create(STDIN_FILENO, STDOUT_FILENO); |
| 310 | if (g != (gid_t)-1) { |
| 311 | if (setgid(g) || (getuid() == 0 && setgroups(1, &g))) { |
| 312 | die(EXIT_FAILURE, "couldn't setgid to %u: %s", |
| 313 | (unsigned)g, strerror(errno)); |
| 314 | } |
| 315 | } |
| 316 | if (u != (uid_t)-1) { |
| 317 | if (setuid(u)) { |
| 318 | die(EXIT_FAILURE, "couldn't setuid to %u: %s", |
| 319 | (unsigned)u, strerror(errno)); |
| 320 | } |
| 321 | } |
| 322 | km_init(kr_priv, kr_pub, tag_priv); |
| 323 | a_init(csock); |
| 324 | if (f & f_daemon) { |
| 325 | if (u_daemon()) |
| 326 | die(EXIT_FAILURE, "couldn't become a daemon: %s", strerror(errno)); |
| 327 | a_daemon(); |
| 328 | } |
| 329 | |
| 330 | { |
| 331 | struct timeval tv; |
| 332 | tv.tv_sec = time(0) + T_INTERVAL; |
| 333 | tv.tv_usec = 0; |
| 334 | sel_addtimer(&sel, &it, &tv, interval, 0); |
| 335 | } |
| 336 | |
| 337 | { |
| 338 | int selerr = 0; |
| 339 | for (;;) { |
| 340 | if (!sel_select(&sel)) |
| 341 | selerr = 0; |
| 342 | else if (errno != EINTR && errno != EAGAIN) { |
| 343 | a_warn("select failed: %s", strerror(errno)); |
| 344 | selerr++; |
| 345 | if (selerr > 8) { |
| 346 | a_warn("too many select errors: bailing out"); |
| 347 | a_quit(); |
| 348 | } |
| 349 | } |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | return (0); |
| 354 | } |
| 355 | |
| 356 | /*----- That's all, folks -------------------------------------------------*/ |