| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id$ |
| 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 | /*----- Header files ------------------------------------------------------*/ |
| 30 | |
| 31 | #include "tripe.h" |
| 32 | |
| 33 | /*----- Global variables --------------------------------------------------*/ |
| 34 | |
| 35 | sel_state sel; |
| 36 | |
| 37 | /*----- Static variables --------------------------------------------------*/ |
| 38 | |
| 39 | static sel_timer it; |
| 40 | #define T_INTERVAL MIN(1) |
| 41 | |
| 42 | /*----- Main code ---------------------------------------------------------*/ |
| 43 | |
| 44 | /* --- @interval@ --- * |
| 45 | * |
| 46 | * Arguments: @struct timeval *tv@ = time when called |
| 47 | * @void *v@ = boring pointer |
| 48 | * |
| 49 | * Returns: --- |
| 50 | * |
| 51 | * Use: Called periodically to do housekeeping tasks. |
| 52 | */ |
| 53 | |
| 54 | void interval(struct timeval *tv, void *v) |
| 55 | { |
| 56 | struct timeval tvv; |
| 57 | T( trace(T_PEER, "peer: interval timer"); ) |
| 58 | rand_seed(RAND_GLOBAL, MAXHASHSZ); |
| 59 | p_interval(); |
| 60 | tvv = *tv; |
| 61 | tvv.tv_sec += T_INTERVAL; |
| 62 | sel_addtimer(&sel, &it, &tvv, interval, v); |
| 63 | } |
| 64 | |
| 65 | /* --- @main@ --- * |
| 66 | * |
| 67 | * Arguments: @int argc@ = number of command line arguments |
| 68 | * @char *argv[]@ = vector of arguments |
| 69 | * |
| 70 | * Returns: Zero if OK, nonzero on error. |
| 71 | * |
| 72 | * Use: Main program. Provides a simple VPN. |
| 73 | */ |
| 74 | |
| 75 | static void usage(FILE *fp) |
| 76 | { |
| 77 | pquis(fp, "Usage: $ [-D] [-d DIR] [-b ADDR] [-p PORT]\n\ |
| 78 | [-U USER] [-G GROUP] [-a SOCKET] [-T TRACE-OPTS]\n\ |
| 79 | [-k PRIV-KEYRING] [-K PUB-KEYRING] [-t KEY-TAG]\n"); |
| 80 | } |
| 81 | |
| 82 | static void version(FILE *fp) |
| 83 | { |
| 84 | pquis(fp, "$, version " VERSION "\n"); |
| 85 | } |
| 86 | |
| 87 | static void help(FILE *fp) |
| 88 | { |
| 89 | version(fp); |
| 90 | fputc('\n', fp); |
| 91 | usage(fp); |
| 92 | fputs("\n\ |
| 93 | Options:\n\ |
| 94 | \n\ |
| 95 | -h, --help Display this help text.\n\ |
| 96 | -v, --version Display version number.\n\ |
| 97 | -u, --usage Display pointless usage message.\n\ |
| 98 | \n\ |
| 99 | -D, --daemon Run in the background.\n\ |
| 100 | -d, --directory=DIR Switch to directory DIR [default " CONFIGDIR "].\n\ |
| 101 | -b, --bind-address=ADDR Bind UDP socket to this IP ADDR.\n\ |
| 102 | -p, --port=PORT Select UDP port to listen to.\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 | " T( "\ |
| 110 | -T, --trace=OPTIONS Turn on tracing options.\n\ |
| 111 | " ) "\ |
| 112 | ", fp); |
| 113 | } |
| 114 | |
| 115 | int main(int argc, char *argv[]) |
| 116 | { |
| 117 | const char *kr_priv = "keyring", *kr_pub = "keyring.pub"; |
| 118 | const char *tag_priv = "tripe-dh"; |
| 119 | const char *csock = SOCKETDIR "/tripesock"; |
| 120 | const char *dir = CONFIGDIR; |
| 121 | const char *p; |
| 122 | unsigned port = 0; |
| 123 | struct in_addr baddr = { INADDR_ANY }; |
| 124 | unsigned f = 0; |
| 125 | uid_t u = -1; |
| 126 | gid_t g = -1; |
| 127 | |
| 128 | #define f_bogus 1u |
| 129 | #define f_daemon 2u |
| 130 | |
| 131 | ego(argv[0]); |
| 132 | T( trace_on(stderr, 0); ) |
| 133 | |
| 134 | if ((p = getenv("TRIPEDIR")) != 0) |
| 135 | dir = p; |
| 136 | |
| 137 | for (;;) { |
| 138 | static const struct option opts[] = { |
| 139 | { "help", 0, 0, 'h' }, |
| 140 | { "version", 0, 0, 'v' }, |
| 141 | { "usage", 0, 0, 'u' }, |
| 142 | |
| 143 | { "daemon", 0, 0, 'D' }, |
| 144 | { "uid", OPTF_ARGREQ, 0, 'U' }, |
| 145 | { "setuid", OPTF_ARGREQ, 0, 'U' }, |
| 146 | { "gid", OPTF_ARGREQ, 0, 'G' }, |
| 147 | { "setgid", OPTF_ARGREQ, 0, 'G' }, |
| 148 | { "bind-address", OPTF_ARGREQ, 0, 'b' }, |
| 149 | { "port", OPTF_ARGREQ, 0, 'p' }, |
| 150 | { "directory", OPTF_ARGREQ, 0, 'd' }, |
| 151 | { "priv-keyring", OPTF_ARGREQ, 0, 'k' }, |
| 152 | { "pub-keyring", OPTF_ARGREQ, 0, 'K' }, |
| 153 | { "tag", OPTF_ARGREQ, 0, 't' }, |
| 154 | { "admin-socket", OPTF_ARGREQ, 0, 'a' }, |
| 155 | #ifndef NTRACE |
| 156 | { "trace", OPTF_ARGREQ, 0, 'T' }, |
| 157 | #endif |
| 158 | |
| 159 | { "tunnel", 0, 0, '0' }, |
| 160 | { 0, 0, 0, 0 } |
| 161 | }; |
| 162 | |
| 163 | int i = mdwopt(argc, argv, "hvuDU:G:b:p:d:k:K:t:a:" T("T:"), |
| 164 | opts, 0, 0, 0); |
| 165 | if (i < 0) |
| 166 | break; |
| 167 | switch (i) { |
| 168 | case 'h': |
| 169 | help(stdout); |
| 170 | exit(0); |
| 171 | case 'v': |
| 172 | version(stdout); |
| 173 | exit(0); |
| 174 | case 'u': |
| 175 | usage(stdout); |
| 176 | exit(0); |
| 177 | |
| 178 | case 'D': |
| 179 | f |= f_daemon; |
| 180 | break; |
| 181 | case 'U': { |
| 182 | struct passwd *pw; |
| 183 | char *p; |
| 184 | unsigned long i = strtoul(optarg, &p, 0); |
| 185 | if (!*p) |
| 186 | pw = getpwuid(i); |
| 187 | else |
| 188 | pw = getpwnam(optarg); |
| 189 | if (!pw) |
| 190 | die(EXIT_FAILURE, "user `%s' not found", optarg); |
| 191 | u = pw->pw_uid; |
| 192 | if (g == -1) |
| 193 | g = pw->pw_gid; |
| 194 | } break; |
| 195 | case 'G': { |
| 196 | struct group *gr; |
| 197 | char *p; |
| 198 | unsigned long i = strtoul(optarg, &p, 0); |
| 199 | if (!*p) |
| 200 | gr = getgrgid(i); |
| 201 | else |
| 202 | gr = getgrnam(optarg); |
| 203 | if (!gr) |
| 204 | die(EXIT_FAILURE, "group `%s' not found", optarg); |
| 205 | g = gr->gr_gid; |
| 206 | } break; |
| 207 | |
| 208 | case 'b': { |
| 209 | struct hostent *h = gethostbyname(optarg); |
| 210 | if (!h) |
| 211 | die(EXIT_FAILURE, "unknown host name `%s'", optarg); |
| 212 | memcpy(&baddr, h->h_addr, sizeof(struct in_addr)); |
| 213 | } break; |
| 214 | case 'p': { |
| 215 | char *p; |
| 216 | unsigned long i = strtoul(optarg, &p, 0); |
| 217 | if (*p) { |
| 218 | struct servent *s = getservbyname(optarg, "udp"); |
| 219 | if (!s) |
| 220 | die(EXIT_FAILURE, "unknown service name `%s'", optarg); |
| 221 | i = ntohs(s->s_port); |
| 222 | } |
| 223 | if (i == 0 || i >= 65536) |
| 224 | die(EXIT_FAILURE, "bad port number %lu", i); |
| 225 | port = i; |
| 226 | } break; |
| 227 | case 'd': |
| 228 | dir = optarg; |
| 229 | break; |
| 230 | case 'k': |
| 231 | kr_priv = optarg; |
| 232 | break; |
| 233 | case 'K': |
| 234 | kr_pub = optarg; |
| 235 | break; |
| 236 | case 'a': |
| 237 | csock = optarg; |
| 238 | break; |
| 239 | case 't': |
| 240 | tag_priv = optarg; |
| 241 | break; |
| 242 | #ifndef NTRACE |
| 243 | case 'T': |
| 244 | tr_flags = traceopt(tr_opts, optarg, tr_flags, 0); |
| 245 | trace_level(tr_flags); |
| 246 | break; |
| 247 | #endif |
| 248 | case '0': { |
| 249 | static const char *tun[] = { "notdef", "unet", "bsd", "linux" }; |
| 250 | puts(tun[TUN_TYPE]); |
| 251 | exit(0); |
| 252 | } break; |
| 253 | default: |
| 254 | f |= f_bogus; |
| 255 | break; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | if (optind < argc || (f & f_bogus)) { |
| 260 | usage(stderr); |
| 261 | exit(EXIT_FAILURE); |
| 262 | } |
| 263 | |
| 264 | if (chdir(dir)) { |
| 265 | die(EXIT_FAILURE, "can't set current directory to `%s': %s", |
| 266 | dir, strerror(errno)); |
| 267 | } |
| 268 | |
| 269 | sel_init(&sel); |
| 270 | sig_init(&sel); |
| 271 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
| 272 | rand_seed(RAND_GLOBAL, MAXHASHSZ); |
| 273 | signal(SIGPIPE, SIG_IGN); |
| 274 | tun_init(); |
| 275 | p_init(baddr, port); |
| 276 | if (!(f & f_daemon)) |
| 277 | a_create(STDIN_FILENO, STDOUT_FILENO); |
| 278 | if (g != (gid_t)-1) { |
| 279 | if (setgid(g) || (getuid() == 0 && setgroups(1, &g))) { |
| 280 | die(EXIT_FAILURE, "couldn't setgid to %u: %s", |
| 281 | (unsigned)g, strerror(errno)); |
| 282 | } |
| 283 | } |
| 284 | if (u != (uid_t)-1) { |
| 285 | if (setuid(u)) { |
| 286 | die(EXIT_FAILURE, "couldn't setuid to %u: %s", |
| 287 | (unsigned)u, strerror(errno)); |
| 288 | } |
| 289 | } |
| 290 | km_init(kr_priv, kr_pub, tag_priv); |
| 291 | a_init(csock); |
| 292 | if (f & f_daemon) { |
| 293 | if (u_daemon()) |
| 294 | die(EXIT_FAILURE, "couldn't become a daemon: %s", strerror(errno)); |
| 295 | a_daemon(); |
| 296 | } |
| 297 | |
| 298 | { |
| 299 | struct timeval tv; |
| 300 | tv.tv_sec = time(0) + T_INTERVAL; |
| 301 | tv.tv_usec = 0; |
| 302 | sel_addtimer(&sel, &it, &tv, interval, 0); |
| 303 | } |
| 304 | |
| 305 | { |
| 306 | int selerr = 0; |
| 307 | for (;;) { |
| 308 | if (!sel_select(&sel)) |
| 309 | selerr = 0; |
| 310 | else if (errno != EINTR && errno != EAGAIN) { |
| 311 | a_warn("select failed: %s", strerror(errno)); |
| 312 | selerr++; |
| 313 | if (selerr > 8) { |
| 314 | a_warn("too many select errors: bailing out"); |
| 315 | a_quit(); |
| 316 | } |
| 317 | } |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | return (0); |
| 322 | } |
| 323 | |
| 324 | /*----- That's all, folks -------------------------------------------------*/ |