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 -D, --daemon            Run in the background.\n\
  95 -F, --foreground        Quit when stdin reports end-of-file.\n\
  96 -d, --directory=DIR     Switch to directory DIR [default " CONFIGDIR "].\n\
  97 -b, --bind-address=ADDR Bind UDP socket to this IP ADDR.\n\
  98 -p, --port=PORT         Select UDP port to listen to "
  99         "[default " STR(TRIPE_PORT) "].\n\
 100 -n, --tunnel=TUNNEL     Seelect default tunnel driver.\n\
 101 -U, --setuid=USER       Set uid to USER after initialization.\n\
 102 -G, --setgid=GROUP      Set gid to GROUP after initialization.\n\
 103 -k, --priv-keyring=FILE Get private key from FILE.\n\
 104 -K, --pub-keyring=FILE  Get public keys from FILE.\n\
 105 -t, --tag=KEYTAG        Use private key labelled TAG.\n\
 106 -a, --admin-socket=FILE Use FILE as the adminstration socket.\n\
 107 -m, --admin-perms=MODE  Permissions to set on admin socket [default 600].\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 = 0;
 118   const char *csock = SOCKETDIR "/tripesock";
 119   int csockmode = 0600;
 120   const char *dir = CONFIGDIR;
 121   const char *p;
 122   const char *bindhost = 0, *bindsvc = STR(TRIPE_PORT);
 123   struct addrinfo aihint = { 0 }, *ailist;
 124   unsigned f = 0;
 125   int i;
 126   int err, selerr = 0;
 127   unsigned af;
 128   struct timeval tv;
 129   uid_t u = -1;
 130   gid_t g = -1;
 131
 132 #define f_bogus 1u
 133 #define f_daemon 2u
 134 #define f_foreground 4u
 135
 136   ego(argv[0]);
 137   T( trace_on(stderr, 0); )
 138
 139   if ((p = getenv("TRIPEDIR")) != 0)
 140     dir = p;
 141   if ((p = getenv("TRIPESOCK")) != 0)
 142     csock = p;
 143   tun_default = tunnels[0];
 144   aihint.ai_family = AF_INET;
 145
 146   for (;;) {
 147     static const struct option opts[] = {
 148       { "help",         0,              0,      'h' },
 149       { "version",      0,              0,      'v' },
 150       { "usage",        0,              0,      'u' },
 151       { "tunnels",      0,              0,      '0' },
 152
 153       { "daemon",       0,              0,      'D' },
 154       { "foreground",   0,              0,      'F' },
 155       { "uid",          OPTF_ARGREQ,    0,      'U' },
 156       { "setuid",       OPTF_ARGREQ,    0,      'U' },
 157       { "gid",          OPTF_ARGREQ,    0,      'G' },
 158       { "setgid",       OPTF_ARGREQ,    0,      'G' },
 159       { "bind-address", OPTF_ARGREQ,    0,      'b' },
 160       { "tunnel",       OPTF_ARGREQ,    0,      'n' },
 161       { "port",         OPTF_ARGREQ,    0,      'p' },
 162       { "directory",    OPTF_ARGREQ,    0,      'd' },
 163       { "priv-keyring", OPTF_ARGREQ,    0,      'k' },
 164       { "pub-keyring",  OPTF_ARGREQ,    0,      'K' },
 165       { "tag",          OPTF_ARGREQ,    0,      't' },
 166       { "admin-socket", OPTF_ARGREQ,    0,      'a' },
 167       { "admin-perms",  OPTF_ARGREQ,    0,      'm' },
 168 #ifndef NTRACE
 169       { "trace",        OPTF_ARGREQ,    0,      'T' },
 170 #endif
 171
 172       { 0,              0,              0,      0 }
 173     };
 174
 175     i = mdwopt(argc, argv, "hvuDFU:G:b:n:p:d:k:K:t:a:m:" T("T:"),
 176                opts, 0, 0, 0);
 177     if (i < 0)
 178       break;
 179     switch (i) {
 180       case 'h':
 181         help(stdout);
 182         exit(0);
 183       case 'v':
 184         version(stdout);
 185         exit(0);
 186       case 'u':
 187         usage(stdout);
 188         exit(0);
 189
 190       case 'D':
 191         f |= f_daemon;
 192         break;
 193       case 'U':
 194         u = u_getuser(optarg, &g);
 195         break;
 196       case 'G':
 197         g = u_getgroup(optarg);
 198         break;
 199       case 'F':
 200         f |= f_foreground;
 201         break;
 202
 203       case 'b':
 204         bindhost = optarg;
 205         break;
 206       case 'p':
 207         bindsvc = optarg;
 208         break;
 209       case 'n': {
 210         int i;
 211         for (i = 0;; i++) {
 212           if (!tunnels[i])
 213             die(EXIT_FAILURE, "unknown tunnel `%s'", optarg);
 214           if (mystrieq(optarg, tunnels[i]->name))
 215             break;
 216         }
 217         tun_default = tunnels[i];
 218       } break;
 219       case 'd':
 220         dir = optarg;
 221         break;
 222       case 'k':
 223         kr_priv = optarg;
 224         break;
 225       case 'K':
 226         kr_pub = optarg;
 227         break;
 228       case 'a':
 229         csock = optarg;
 230         break;
 231       case 'm': {
 232         char *p;
 233         csockmode = strtol(optarg, &p, 8);
 234         if (*p) die(EXIT_FAILURE, "bad permissions: `%s'", optarg);
 235       } break;
 236       case 't':
 237         tag_priv = optarg;
 238         break;
 239 #ifndef NTRACE
 240       case 'T':
 241         tr_flags = traceopt(tr_opts, optarg, tr_flags, 0);
 242         trace_level(tr_flags);
 243         break;
 244 #endif
 245       case '0': {
 246         int i;
 247         for (i = 0; tunnels[i]; i++)
 248           puts(tunnels[i]->name);
 249         exit(0);
 250       } break;
 251       default:
 252         f |= f_bogus;
 253         break;
 254     }
 255   }
 256
 257   if (optind < argc || (f & f_bogus)) {
 258     usage(stderr);
 259     exit(EXIT_FAILURE);
 260   }
 261   if (!(~f & (f_daemon | f_foreground)))
 262     die(EXIT_FAILURE, "foreground operation for a daemon is silly");
 263
 264   aihint.ai_protocol = IPPROTO_UDP;
 265   aihint.ai_socktype = SOCK_DGRAM;
 266   aihint.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
 267   if ((err = getaddrinfo(bindhost, bindsvc, &aihint, &ailist)) != 0) {
 268     die(EXIT_FAILURE, "couldn't resolve hostname %c%s%c, port `%s': %s",
 269         bindhost ? '`' : '<',
 270         bindhost ? bindhost : "nil",
 271         bindhost ? '\'' : '>',
 272         bindsvc, gai_strerror(err));
 273   }
 274
 275   if (chdir(dir)) {
 276     die(EXIT_FAILURE, "can't set current directory to `%s': %s",
 277         dir, strerror(errno));
 278   }
 279
 280   sel_init(&sel);
 281   sig_init(&sel);
 282   rand_noisesrc(RAND_GLOBAL, &noise_source);
 283   rand_seed(RAND_GLOBAL, MAXHASHSZ);
 284   signal(SIGPIPE, SIG_IGN);
 285   for (i = 0; tunnels[i]; i++)
 286     tunnels[i]->init();
 287   p_init(ailist); freeaddrinfo(ailist);
 288   if (!(f & f_daemon)) {
 289     af = AF_WARN;
 290 #ifndef NTRACE
 291     af |= AF_TRACE;
 292 #endif
 293     if (f & f_foreground)
 294       af |= AF_FOREGROUND;
 295     a_create(STDIN_FILENO, STDOUT_FILENO, af);
 296   }
 297   ps_split(f & f_daemon);
 298   a_init(csock, u, g, csockmode);
 299   u_setugid(u, g);
 300   km_init(kr_priv, kr_pub, tag_priv);
 301   if (f & f_daemon) {
 302     if (daemonize())
 303       die(EXIT_FAILURE, "couldn't become a daemon: %s", strerror(errno));
 304     a_daemon();
 305   }
 306
 307   tv.tv_sec = time(0) + T_INTERVAL;
 308   tv.tv_usec = 0;
 309   sel_addtimer(&sel, &it, &tv, interval, 0);
 310
 311   for (;;) {
 312     a_preselect();
 313     if (!sel_select(&sel))
 314       selerr = 0;
 315     else if (errno != EINTR && errno != EAGAIN) {
 316       a_warn("SERVER", "select-error", "?ERRNO", A_END);
 317       selerr++;
 318       if (selerr > 8) {
 319         a_warn("ABORT", "repeated-select-errors", A_END);
 320         abort();
 321       }
 322     }
 323   }
 324
 325   return (0);
 326 }
 327
 328 /*----- That's all, folks -------------------------------------------------*/