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
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * TrIPE is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with TrIPE; if not, write to the Free Software Foundation,
  24  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 /*----- Header files ------------------------------------------------------*/
  28
  29 #include "tripe.h"
  30
  31 /*----- Global variables --------------------------------------------------*/
  32
  33 sel_state sel;
  34
  35 /*----- Static variables --------------------------------------------------*/
  36
  37 static sel_timer it;
  38 #define T_INTERVAL MIN(1)
  39
  40 /*----- Main code ---------------------------------------------------------*/
  41
  42 /* --- @interval@ --- *
  43  *
  44  * Arguments:   @struct timeval *tv@ = time when called
  45  *              @void *v@ = boring pointer
  46  *
  47  * Returns:     ---
  48  *
  49  * Use:         Called periodically to do housekeeping tasks.
  50  */
  51
  52 static void interval(struct timeval *tv, void *v)
  53 {
  54   struct timeval tvv;
  55   T( trace(T_PEER, "peer: interval timer"); )
  56   rand_seed(RAND_GLOBAL, MAXHASHSZ);
  57   p_interval();
  58   tvv = *tv;
  59   tvv.tv_sec += T_INTERVAL;
  60   sel_addtimer(&sel, &it, &tvv, interval, v);
  61 }
  62
  63 /* --- @main@ --- *
  64  *
  65  * Arguments:   @int argc@ = number of command line arguments
  66  *              @char *argv[]@ = vector of arguments
  67  *
  68  * Returns:     Zero if OK, nonzero on error.
  69  *
  70  * Use:         Main program.  Provides a simple VPN.
  71  */
  72
  73 static void usage(FILE *fp)
  74 {
  75   pquis(fp, "Usage: $ [-DF] [-d DIR] [-b ADDR] [-p PORT] [-n TUNNEL]\n\
  76         [-U USER] [-G GROUP] [-a SOCKET] [-T TRACE-OPTS]\n\
  77         [-k PRIV-KEYRING] [-K PUB-KEYRING] [-t KEY-TAG]\n");
  78 }
  79
  80 static void version(FILE *fp) { pquis(fp, "$, version " VERSION "\n"); }
  81
  82 static void help(FILE *fp)
  83 {
  84   version(fp);
  85   fputc('\n', fp);
  86   usage(fp);
  87   fputs("\n\
  88 Options:\n\
  89 \n\
  90 -h, --help              Display this help text.\n\
  91 -v, --version           Display version number.\n\
  92 -u, --usage             Display pointless usage message.\n\
  93     --tunnels           Display IP tunnel drivers and exit.\n\
  94 \n\
  95 -D, --daemon            Run in the background.\n\
  96 -F, --foreground        Quit when stdin reports end-of-file.\n\
  97 -d, --directory=DIR     Switch to directory DIR [default " CONFIGDIR "].\n\
  98 -b, --bind-address=ADDR Bind UDP socket to this IP ADDR.\n\
  99 -p, --port=PORT         Select UDP port to listen to "
 100         "[default " STR(TRIPE_PORT) "].\n\
 101 -n, --tunnel=TUNNEL     Seelect default tunnel driver.\n\
 102 -U, --setuid=USER       Set uid to USER after initialization.\n\
 103 -G, --setgid=GROUP      Set gid to GROUP after initialization.\n\
 104 -k, --priv-keyring=FILE Get private key from FILE.\n\
 105 -K, --pub-keyring=FILE  Get public keys from FILE.\n\
 106 -t, --tag=KEYTAG        Use private key labelled TAG.\n\
 107 -a, --admin-socket=FILE Use FILE as the adminstration socket.\n\
 108 " T( "\
 109 -T, --trace=OPTIONS     Turn on tracing options.\n\
 110 " ) "\
 111 ", fp);
 112 }
 113
 114 int main(int argc, char *argv[])
 115 {
 116   const char *kr_priv = "keyring", *kr_pub = "keyring.pub";
 117   const char *tag_priv = "tripe-dh";
 118   const char *csock = SOCKETDIR "/tripesock";
 119   const char *dir = CONFIGDIR;
 120   const char *p;
 121   unsigned port = TRIPE_PORT;
 122   struct in_addr baddr = { INADDR_ANY };
 123   unsigned f = 0;
 124   int i;
 125   int selerr = 0;
 126   unsigned af;
 127   struct timeval tv;
 128   uid_t u = -1;
 129   gid_t g = -1;
 130
 131 #define f_bogus 1u
 132 #define f_daemon 2u
 133 #define f_foreground 4u
 134
 135   ego(argv[0]);
 136   T( trace_on(stderr, 0); )
 137
 138   if ((p = getenv("TRIPEDIR")) != 0)
 139     dir = p;
 140   if ((p = getenv("TRIPESOCK")) != 0)
 141     csock = p;
 142   tun_default = tunnels[0];
 143
 144   for (;;) {
 145     static const struct option opts[] = {
 146       { "help",         0,              0,      'h' },
 147       { "version",      0,              0,      'v' },
 148       { "usage",        0,              0,      'u' },
 149       { "tunnels",      0,              0,      '0' },
 150
 151       { "daemon",       0,              0,      'D' },
 152       { "foreground",   0,              0,      'F' },
 153       { "uid",          OPTF_ARGREQ,    0,      'U' },
 154       { "setuid",       OPTF_ARGREQ,    0,      'U' },
 155       { "gid",          OPTF_ARGREQ,    0,      'G' },
 156       { "setgid",       OPTF_ARGREQ,    0,      'G' },
 157       { "bind-address", OPTF_ARGREQ,    0,      'b' },
 158       { "tunnel",       OPTF_ARGREQ,    0,      'n' },
 159       { "port",         OPTF_ARGREQ,    0,      'p' },
 160       { "directory",    OPTF_ARGREQ,    0,      'd' },
 161       { "priv-keyring", OPTF_ARGREQ,    0,      'k' },
 162       { "pub-keyring",  OPTF_ARGREQ,    0,      'K' },
 163       { "tag",          OPTF_ARGREQ,    0,      't' },
 164       { "admin-socket", OPTF_ARGREQ,    0,      'a' },
 165 #ifndef NTRACE
 166       { "trace",        OPTF_ARGREQ,    0,      'T' },
 167 #endif
 168
 169       { 0,              0,              0,      0 }
 170     };
 171
 172     i = mdwopt(argc, argv, "hvuDFU:G:b:n:p:d:k:K:t:a:" T("T:"),
 173                opts, 0, 0, 0);
 174     if (i < 0)
 175       break;
 176     switch (i) {
 177       case 'h':
 178         help(stdout);
 179         exit(0);
 180       case 'v':
 181         version(stdout);
 182         exit(0);
 183       case 'u':
 184         usage(stdout);
 185         exit(0);
 186
 187       case 'D':
 188         f |= f_daemon;
 189         break;
 190       case 'U':
 191         u = u_getuser(optarg, &g);
 192         break;
 193       case 'G':
 194         g = u_getgroup(optarg);
 195         break;
 196       case 'F':
 197         f |= f_foreground;
 198         break;
 199
 200       case 'b': {
 201         struct hostent *h = gethostbyname(optarg);
 202         if (!h)
 203           die(EXIT_FAILURE, "unknown host name `%s'", optarg);
 204         memcpy(&baddr, h->h_addr, sizeof(struct in_addr));
 205       } break;
 206       case 'p': {
 207         char *p;
 208         unsigned long i = strtoul(optarg, &p, 0);
 209         if (*p) {
 210           struct servent *s = getservbyname(optarg, "udp");
 211           if (!s)
 212             die(EXIT_FAILURE, "unknown service name `%s'", optarg);
 213           i = ntohs(s->s_port);
 214         }
 215         if (i >= 65536)
 216           die(EXIT_FAILURE, "bad port number %lu", i);
 217         port = i;
 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 't':
 242         tag_priv = optarg;
 243         break;
 244 #ifndef NTRACE
 245       case 'T':
 246         tr_flags = traceopt(tr_opts, optarg, tr_flags, 0);
 247         trace_level(tr_flags);
 248         break;
 249 #endif
 250       case '0': {
 251         int i;
 252         for (i = 0; tunnels[i]; i++)
 253           puts(tunnels[i]->name);
 254         exit(0);
 255       } break;
 256       default:
 257         f |= f_bogus;
 258         break;
 259     }
 260   }
 261
 262   if (optind < argc || (f & f_bogus)) {
 263     usage(stderr);
 264     exit(EXIT_FAILURE);
 265   }
 266   if (!(~f & (f_daemon | f_foreground)))
 267     die(EXIT_FAILURE, "foreground operation for a daemon is silly");
 268
 269   if (chdir(dir)) {
 270     die(EXIT_FAILURE, "can't set current directory to `%s': %s",
 271         dir, strerror(errno));
 272   }
 273
 274   sel_init(&sel);
 275   sig_init(&sel);
 276   rand_noisesrc(RAND_GLOBAL, &noise_source);
 277   rand_seed(RAND_GLOBAL, MAXHASHSZ);
 278   signal(SIGPIPE, SIG_IGN);
 279   for (i = 0; tunnels[i]; i++)
 280     tunnels[i]->init();
 281   p_init(baddr, port);
 282   if (!(f & f_daemon)) {
 283     af = AF_WARN;
 284 #ifndef NTRACE
 285     af |= AF_TRACE;
 286 #endif
 287     if (f & f_foreground)
 288       af |= AF_FOREGROUND;
 289     a_create(STDIN_FILENO, STDOUT_FILENO, af);
 290   }
 291   ps_split(f & f_daemon);
 292   a_init(csock, u, g);
 293   u_setugid(u, g);
 294   km_init(kr_priv, kr_pub, tag_priv);
 295   if (f & f_daemon) {
 296     if (daemonize())
 297       die(EXIT_FAILURE, "couldn't become a daemon: %s", strerror(errno));
 298     a_daemon();
 299   }
 300
 301   tv.tv_sec = time(0) + T_INTERVAL;
 302   tv.tv_usec = 0;
 303   sel_addtimer(&sel, &it, &tv, interval, 0);
 304
 305   for (;;) {
 306     a_preselect();
 307     if (!sel_select(&sel))
 308       selerr = 0;
 309     else if (errno != EINTR && errno != EAGAIN) {
 310       a_warn("SERVER", "select-error", "?ERRNO", A_END);
 311       selerr++;
 312       if (selerr > 8) {
 313         a_warn("ABORT", "repeated-select-errors", A_END);
 314         abort();
 315       }
 316     }
 317   }
 318
 319   return (0);
 320 }
 321
 322 /*----- That's all, folks -------------------------------------------------*/