mdw@git.distorted.org.uk Git - tripe/blob - server/tripe.c

   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 /*----- Main code ---------------------------------------------------------*/
  40
  41 /* --- @interval@ --- *
  42  *
  43  * Arguments:   @struct timeval *tv@ = time when called
  44  *              @void *v@ = boring pointer
  45  *
  46  * Returns:     ---
  47  *
  48  * Use:         Called periodically to do housekeeping tasks.
  49  */
  50
  51 static void interval(struct timeval *tv, void *v)
  52 {
  53   struct timeval tvv;
  54   T( trace(T_PEER, "peer: interval timer"); )
  55   rand_seed(RAND_GLOBAL, MAXHASHSZ);
  56   p_interval();
  57   tvv = *tv;
  58   tvv.tv_sec += T_INTERVAL;
  59   sel_addtimer(&sel, &it, &tvv, interval, v);
  60 }
  61
  62 /* --- @main@ --- *
  63  *
  64  * Arguments:   @int argc@ = number of command line arguments
  65  *              @char *argv[]@ = vector of arguments
  66  *
  67  * Returns:     Zero if OK, nonzero on error.
  68  *
  69  * Use:         Main program.  Provides a simple VPN.
  70  */
  71
  72 static void usage(FILE *fp)
  73 {
  74   pquis(fp, "Usage: $ [-DF] [-d DIR] [-b ADDR] [-p PORT] [-n TUNNEL]\n\
  75         [-U USER] [-G GROUP] [-a SOCKET] [-m MODE] [-T TRACE-OPTS]\n\
  76         [-k PRIV-KEYRING] [-K PUB-KEYRING] [-t KEY-TAG]\n");
  77 }
  78
  79 static void version(FILE *fp) { pquis(fp, "$, version " VERSION "\n"); }
  80
  81 static void help(FILE *fp)
  82 {
  83   version(fp);
  84   fputc('\n', fp);
  85   usage(fp);
  86   fputs("\n\
  87 Options:\n\
  88 \n\
  89 -h, --help              Display this help text.\n\
  90 -v, --version           Display version number.\n\
  91 -u, --usage             Display pointless usage message.\n\
  92     --tunnels           Display IP tunnel drivers and exit.\n\
  93 \n\
  94 -4, --ipv4              Transport over IPv4 only.\n\
  95 -6, --ipv6              Transport over IPv6 only.\n\
  96 -D, --daemon            Run in the background.\n\
  97 -F, --foreground        Quit when stdin reports end-of-file.\n\
  98 -d, --directory=DIR     Switch to directory DIR [default " CONFIGDIR "].\n\
  99 -b, --bind-address=ADDR Bind UDP socket to this IP ADDR.\n\
 100 -p, --port=PORT         Select UDP port to listen to "
 101         "[default " STR(TRIPE_PORT) "].\n\
 102 -n, --tunnel=TUNNEL     Seelect default tunnel driver.\n\
 103 -U, --setuid=USER       Set uid to USER after initialization.\n\
 104 -G, --setgid=GROUP      Set gid to GROUP after initialization.\n\
 105 -k, --priv-keyring=FILE Get private key from FILE.\n\
 106 -K, --pub-keyring=FILE  Get public keys from FILE.\n\
 107 -t, --tag=KEYTAG        Use private key labelled TAG.\n\
 108 -a, --admin-socket=FILE Use FILE as the adminstration socket.\n\
 109 -m, --admin-perms=MODE  Permissions to set on admin socket [default 600].\n\
 110 " T( "\
 111 -T, --trace=OPTIONS     Turn on tracing options.\n\
 112 " ) "\
 113 ", fp);
 114 }
 115
 116 int main(int argc, char *argv[])
 117 {
 118   const char *kr_priv = "keyring", *kr_pub = "keyring.pub";
 119   const char *tag_priv = 0;
 120   const char *csock = SOCKETDIR "/tripesock";
 121   int csockmode = 0600;
 122   const char *dir = CONFIGDIR;
 123   const char *p;
 124   const char *bindhost = 0, *bindsvc = STR(TRIPE_PORT);
 125   struct addrinfo aihint = { 0 }, *ailist;
 126   unsigned f = 0;
 127   int i;
 128   int err, selerr = 0;
 129   unsigned af;
 130   struct timeval tv;
 131   uid_t u = -1;
 132   gid_t g = -1;
 133
 134 #define f_bogus 1u
 135 #define f_daemon 2u
 136 #define f_foreground 4u
 137
 138   ego(argv[0]);
 139   T( trace_on(stderr, 0); )
 140
 141   if ((p = getenv("TRIPEDIR")) != 0)
 142     dir = p;
 143   if ((p = getenv("TRIPESOCK")) != 0)
 144     csock = p;
 145   tun_default = tunnels[0];
 146   aihint.ai_family = AF_UNSPEC;
 147
 148   for (;;) {
 149     static const struct option opts[] = {
 150       { "help",         0,              0,      'h' },
 151       { "version",      0,              0,      'v' },
 152       { "usage",        0,              0,      'u' },
 153       { "tunnels",      0,              0,      '0' },
 154
 155       { "ipv4",         0,              0,      '4' },
 156       { "ipv6",         0,              0,      '6' },
 157       { "daemon",       0,              0,      'D' },
 158       { "foreground",   0,              0,      'F' },
 159       { "uid",          OPTF_ARGREQ,    0,      'U' },
 160       { "setuid",       OPTF_ARGREQ,    0,      'U' },
 161       { "gid",          OPTF_ARGREQ,    0,      'G' },
 162       { "setgid",       OPTF_ARGREQ,    0,      'G' },
 163       { "bind-address", OPTF_ARGREQ,    0,      'b' },
 164       { "tunnel",       OPTF_ARGREQ,    0,      'n' },
 165       { "port",         OPTF_ARGREQ,    0,      'p' },
 166       { "directory",    OPTF_ARGREQ,    0,      'd' },
 167       { "priv-keyring", OPTF_ARGREQ,    0,      'k' },
 168       { "pub-keyring",  OPTF_ARGREQ,    0,      'K' },
 169       { "tag",          OPTF_ARGREQ,    0,      't' },
 170       { "admin-socket", OPTF_ARGREQ,    0,      'a' },
 171       { "admin-perms",  OPTF_ARGREQ,    0,      'm' },
 172 #ifndef NTRACE
 173       { "trace",        OPTF_ARGREQ,    0,      'T' },
 174 #endif
 175
 176       { 0,              0,              0,      0 }
 177     };
 178
 179     i = mdwopt(argc, argv, "hvu46DFU:G:b:n:p:d:k:K:t:a:m:" T("T:"),
 180                opts, 0, 0, 0);
 181     if (i < 0)
 182       break;
 183     switch (i) {
 184       case 'h':
 185         help(stdout);
 186         exit(0);
 187       case 'v':
 188         version(stdout);
 189         exit(0);
 190       case 'u':
 191         usage(stdout);
 192         exit(0);
 193
 194       case '4':
 195         aihint.ai_family = AF_INET;
 196         break;
 197       case '6':
 198         aihint.ai_family = AF_INET6;
 199         break;
 200       case 'D':
 201         f |= f_daemon;
 202         break;
 203       case 'U':
 204         u = u_getuser(optarg, &g);
 205         break;
 206       case 'G':
 207         g = u_getgroup(optarg);
 208         break;
 209       case 'F':
 210         f |= f_foreground;
 211         break;
 212
 213       case 'b':
 214         bindhost = optarg;
 215         break;
 216       case 'p':
 217         bindsvc = optarg;
 218         break;
 219       case 'n': {
 220         int i;
 221         for (i = 0;; i++) {
 222           if (!tunnels[i])
 223             die(EXIT_FAILURE, "unknown tunnel `%s'", optarg);
 224           if (mystrieq(optarg, tunnels[i]->name))
 225             break;
 226         }
 227         tun_default = tunnels[i];
 228       } break;
 229       case 'd':
 230         dir = optarg;
 231         break;
 232       case 'k':
 233         kr_priv = optarg;
 234         break;
 235       case 'K':
 236         kr_pub = optarg;
 237         break;
 238       case 'a':
 239         csock = optarg;
 240         break;
 241       case 'm': {
 242         char *p;
 243         csockmode = strtol(optarg, &p, 8);
 244         if (*p) die(EXIT_FAILURE, "bad permissions: `%s'", optarg);
 245       } break;
 246       case 't':
 247         tag_priv = optarg;
 248         break;
 249 #ifndef NTRACE
 250       case 'T':
 251         tr_flags = traceopt(tr_opts, optarg, tr_flags, 0);
 252         trace_level(tr_flags);
 253         break;
 254 #endif
 255       case '0': {
 256         int i;
 257         for (i = 0; tunnels[i]; i++)
 258           puts(tunnels[i]->name);
 259         exit(0);
 260       } break;
 261       default:
 262         f |= f_bogus;
 263         break;
 264     }
 265   }
 266
 267   if (optind < argc || (f & f_bogus)) {
 268     usage(stderr);
 269     exit(EXIT_FAILURE);
 270   }
 271   if (!(~f & (f_daemon | f_foreground)))
 272     die(EXIT_FAILURE, "foreground operation for a daemon is silly");
 273
 274   aihint.ai_protocol = IPPROTO_UDP;
 275   aihint.ai_socktype = SOCK_DGRAM;
 276   aihint.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
 277   if ((err = getaddrinfo(bindhost, bindsvc, &aihint, &ailist)) != 0) {
 278     die(EXIT_FAILURE, "couldn't resolve hostname %c%s%c, port `%s': %s",
 279         bindhost ? '`' : '<',
 280         bindhost ? bindhost : "nil",
 281         bindhost ? '\'' : '>',
 282         bindsvc, gai_strerror(err));
 283   }
 284
 285   if (chdir(dir)) {
 286     die(EXIT_FAILURE, "can't set current directory to `%s': %s",
 287         dir, strerror(errno));
 288   }
 289
 290   sel_init(&sel);
 291   sig_init(&sel);
 292   rand_noisesrc(RAND_GLOBAL, &noise_source);
 293   rand_seed(RAND_GLOBAL, MAXHASHSZ);
 294   signal(SIGPIPE, SIG_IGN);
 295
 296   if (!(f & f_daemon)) {
 297     af = AF_WARN;
 298 #ifndef NTRACE
 299     af |= AF_TRACE;
 300 #endif
 301     if (f & f_foreground)
 302       af |= AF_FOREGROUND;
 303     a_create(STDIN_FILENO, STDOUT_FILENO, af);
 304     a_switcherr();
 305   }
 306
 307   p_init();
 308   for (i = 0; tunnels[i]; i++)
 309     tunnels[i]->init();
 310   p_bind(ailist); freeaddrinfo(ailist);
 311
 312   for (i = 0; tunnels[i]; i++) {
 313     if (tunnels[i]->flags&TUNF_PRIVOPEN) {
 314       ps_split(f & f_daemon);
 315       break;
 316     }
 317   }
 318
 319   a_init();
 320   a_signals();
 321   a_listen(csock, u, g, csockmode);
 322   u_setugid(u, g);
 323   km_init(kr_priv, kr_pub, tag_priv);
 324   kx_init();
 325   if (f & f_daemon) {
 326     if (daemonize())
 327       die(EXIT_FAILURE, "couldn't become a daemon: %s", strerror(errno));
 328     a_daemon();
 329     a_switcherr();
 330   }
 331
 332   tv.tv_sec = time(0) + T_INTERVAL;
 333   tv.tv_usec = 0;
 334   sel_addtimer(&sel, &it, &tv, interval, 0);
 335
 336   for (;;) {
 337     a_preselect();
 338     if (!sel_select(&sel))
 339       selerr = 0;
 340     else if (errno != EINTR && errno != EAGAIN) {
 341       a_warn("SERVER", "select-error", "?ERRNO", A_END);
 342       selerr++;
 343       if (selerr > 8) {
 344         a_warn("ABORT", "repeated-select-errors", A_END);
 345         abort();
 346       }
 347     }
 348   }
 349
 350   return (0);
 351 }
 352
 353 /*----- That's all, folks -------------------------------------------------*/