| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Initialization for the standalone server |
| 4 | * |
| 5 | * (c) 2018 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 | /*----- Tunnel table ------------------------------------------------------*/ |
| 31 | |
| 32 | static const tunnel_ops *tunnels[] = { |
| 33 | #ifdef TUN_LINUX |
| 34 | &tun_linux, |
| 35 | #endif |
| 36 | #ifdef TUN_BSD |
| 37 | &tun_bsd, |
| 38 | #endif |
| 39 | #ifdef TUN_UNET |
| 40 | &tun_unet, |
| 41 | #endif |
| 42 | &tun_slip, |
| 43 | }; |
| 44 | |
| 45 | /*----- Main code ---------------------------------------------------------*/ |
| 46 | |
| 47 | /* --- @main@ --- * |
| 48 | * |
| 49 | * Arguments: @int argc@ = number of command line arguments |
| 50 | * @char *argv[]@ = vector of arguments |
| 51 | * |
| 52 | * Returns: Zero if OK, nonzero on error. |
| 53 | * |
| 54 | * Use: Main program. Provides a simple VPN. |
| 55 | */ |
| 56 | |
| 57 | static void usage(FILE *fp) |
| 58 | { |
| 59 | pquis(fp, "Usage: $ [-DF] [-d DIR] [-b ADDR] [-p PORT] [-n TUNNEL]\n\ |
| 60 | [-U USER] [-G GROUP] [-a SOCKET] [-m MODE] [-T TRACE-OPTS]\n\ |
| 61 | [-k PRIV-KEYRING] [-K PUB-KEYRING] [-t KEY-TAG]\n"); |
| 62 | } |
| 63 | |
| 64 | static void version(FILE *fp) { pquis(fp, "$, version " VERSION "\n"); } |
| 65 | |
| 66 | static void help(FILE *fp) |
| 67 | { |
| 68 | version(fp); |
| 69 | fputc('\n', fp); |
| 70 | usage(fp); |
| 71 | fputs("\n\ |
| 72 | Options:\n\ |
| 73 | \n\ |
| 74 | -h, --help Display this help text.\n\ |
| 75 | -v, --version Display version number.\n\ |
| 76 | -u, --usage Display pointless usage message.\n\ |
| 77 | --tunnels Display IP tunnel drivers and exit.\n\ |
| 78 | \n\ |
| 79 | -4, --ipv4 Transport over IPv4 only.\n\ |
| 80 | -6, --ipv6 Transport over IPv6 only.\n\ |
| 81 | -D, --daemon Run in the background.\n\ |
| 82 | -F, --foreground Quit when stdin reports end-of-file.\n\ |
| 83 | -d, --directory=DIR Switch to directory DIR [default " CONFIGDIR "].\n\ |
| 84 | -b, --bind-address=ADDR Bind UDP socket to this IP ADDR.\n\ |
| 85 | -p, --port=PORT Select UDP port to listen to " |
| 86 | "[default " STR(TRIPE_PORT) "].\n\ |
| 87 | -n, --tunnel=TUNNEL Seelect default tunnel driver.\n\ |
| 88 | -U, --setuid=USER Set uid to USER after initialization.\n\ |
| 89 | -G, --setgid=GROUP Set gid to GROUP after initialization.\n\ |
| 90 | -k, --priv-keyring=FILE Get private key from FILE.\n\ |
| 91 | -K, --pub-keyring=FILE Get public keys from FILE.\n\ |
| 92 | -t, --tag=KEYTAG Use private key labelled TAG.\n\ |
| 93 | -a, --admin-socket=FILE Use FILE as the adminstration socket.\n\ |
| 94 | -m, --admin-perms=MODE Permissions to set on admin socket [default 600].\n\ |
| 95 | " T( "\ |
| 96 | -T, --trace=OPTIONS Turn on tracing options.\n\ |
| 97 | " ) "\ |
| 98 | ", fp); |
| 99 | } |
| 100 | |
| 101 | int main(int argc, char *argv[]) |
| 102 | { |
| 103 | const char *kr_priv = "keyring", *kr_pub = "keyring.pub"; |
| 104 | const char *tag_priv = 0; |
| 105 | const char *csock = SOCKETDIR "/tripesock"; |
| 106 | int csockmode = 0600; |
| 107 | const char *dir = CONFIGDIR; |
| 108 | const char *p; |
| 109 | const char *bindhost = 0, *bindsvc = STR(TRIPE_PORT); |
| 110 | struct addrinfo aihint = { 0 }, *ailist; |
| 111 | const tunnel_ops *dflt = 0; |
| 112 | unsigned f = 0; |
| 113 | int i; |
| 114 | int err; |
| 115 | unsigned af; |
| 116 | uid_t u = -1; |
| 117 | gid_t g = -1; |
| 118 | |
| 119 | #define f_bogus 1u |
| 120 | #define f_daemon 2u |
| 121 | #define f_foreground 4u |
| 122 | |
| 123 | ego(argv[0]); |
| 124 | T( trace_on(stderr, 0); ) |
| 125 | |
| 126 | if ((p = getenv("TRIPEDIR")) != 0) |
| 127 | dir = p; |
| 128 | if ((p = getenv("TRIPESOCK")) != 0) |
| 129 | csock = p; |
| 130 | aihint.ai_family = AF_UNSPEC; |
| 131 | |
| 132 | for (;;) { |
| 133 | static const struct option opts[] = { |
| 134 | { "help", 0, 0, 'h' }, |
| 135 | { "version", 0, 0, 'v' }, |
| 136 | { "usage", 0, 0, 'u' }, |
| 137 | { "tunnels", 0, 0, '0' }, |
| 138 | |
| 139 | { "ipv4", 0, 0, '4' }, |
| 140 | { "ipv6", 0, 0, '6' }, |
| 141 | { "daemon", 0, 0, 'D' }, |
| 142 | { "foreground", 0, 0, 'F' }, |
| 143 | { "uid", OPTF_ARGREQ, 0, 'U' }, |
| 144 | { "setuid", OPTF_ARGREQ, 0, 'U' }, |
| 145 | { "gid", OPTF_ARGREQ, 0, 'G' }, |
| 146 | { "setgid", OPTF_ARGREQ, 0, 'G' }, |
| 147 | { "bind-address", OPTF_ARGREQ, 0, 'b' }, |
| 148 | { "tunnel", OPTF_ARGREQ, 0, 'n' }, |
| 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 | { "admin-perms", OPTF_ARGREQ, 0, 'm' }, |
| 156 | #ifndef NTRACE |
| 157 | { "trace", OPTF_ARGREQ, 0, 'T' }, |
| 158 | #endif |
| 159 | |
| 160 | { 0, 0, 0, 0 } |
| 161 | }; |
| 162 | |
| 163 | i = mdwopt(argc, argv, "hvu46DFU:G:b:n:p:d:k:K:t:a:m:" 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 '4': |
| 179 | aihint.ai_family = AF_INET; |
| 180 | break; |
| 181 | case '6': |
| 182 | aihint.ai_family = AF_INET6; |
| 183 | break; |
| 184 | case 'D': |
| 185 | f |= f_daemon; |
| 186 | break; |
| 187 | case 'U': |
| 188 | u = u_getuser(optarg, &g); |
| 189 | break; |
| 190 | case 'G': |
| 191 | g = u_getgroup(optarg); |
| 192 | break; |
| 193 | case 'F': |
| 194 | f |= f_foreground; |
| 195 | break; |
| 196 | |
| 197 | case 'b': |
| 198 | bindhost = optarg; |
| 199 | break; |
| 200 | case 'p': |
| 201 | bindsvc = optarg; |
| 202 | break; |
| 203 | case 'n': { |
| 204 | int i; |
| 205 | for (i = 0; i < N(tunnels); i++) |
| 206 | if (mystrieq(optarg, tunnels[i]->name)) |
| 207 | { dflt = tunnels[i]; goto found_tun; } |
| 208 | die(EXIT_FAILURE, "unknown tunnel `%s'", optarg); |
| 209 | found_tun:; |
| 210 | } break; |
| 211 | case 'd': |
| 212 | dir = optarg; |
| 213 | break; |
| 214 | case 'k': |
| 215 | kr_priv = optarg; |
| 216 | break; |
| 217 | case 'K': |
| 218 | kr_pub = optarg; |
| 219 | break; |
| 220 | case 'a': |
| 221 | csock = optarg; |
| 222 | break; |
| 223 | case 'm': { |
| 224 | char *p; |
| 225 | csockmode = strtol(optarg, &p, 8); |
| 226 | if (*p) die(EXIT_FAILURE, "bad permissions: `%s'", optarg); |
| 227 | } break; |
| 228 | case 't': |
| 229 | tag_priv = optarg; |
| 230 | break; |
| 231 | #ifndef NTRACE |
| 232 | case 'T': |
| 233 | tr_flags = traceopt(tr_opts, optarg, tr_flags, 0); |
| 234 | trace_level(tr_flags); |
| 235 | break; |
| 236 | #endif |
| 237 | case '0': { |
| 238 | int i; |
| 239 | for (i = 0; i < N(tunnels); i++) |
| 240 | puts(tunnels[i]->name); |
| 241 | exit(0); |
| 242 | } break; |
| 243 | default: |
| 244 | f |= f_bogus; |
| 245 | break; |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | if (optind < argc || (f & f_bogus)) { |
| 250 | usage(stderr); |
| 251 | exit(EXIT_FAILURE); |
| 252 | } |
| 253 | if (!(~f & (f_daemon | f_foreground))) |
| 254 | die(EXIT_FAILURE, "foreground operation for a daemon is silly"); |
| 255 | |
| 256 | aihint.ai_protocol = IPPROTO_UDP; |
| 257 | aihint.ai_socktype = SOCK_DGRAM; |
| 258 | aihint.ai_flags = AI_PASSIVE | AI_ADDRCONFIG; |
| 259 | if ((err = getaddrinfo(bindhost, bindsvc, &aihint, &ailist)) != 0) { |
| 260 | die(EXIT_FAILURE, "couldn't resolve hostname %c%s%c, port `%s': %s", |
| 261 | bindhost ? '`' : '<', |
| 262 | bindhost ? bindhost : "nil", |
| 263 | bindhost ? '\'' : '>', |
| 264 | bindsvc, gai_strerror(err)); |
| 265 | } |
| 266 | |
| 267 | if (chdir(dir)) { |
| 268 | die(EXIT_FAILURE, "can't set current directory to `%s': %s", |
| 269 | dir, strerror(errno)); |
| 270 | } |
| 271 | |
| 272 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
| 273 | rand_seed(RAND_GLOBAL, MAXHASHSZ); |
| 274 | |
| 275 | lp_init(); |
| 276 | |
| 277 | if (!(f & f_daemon)) { |
| 278 | af = AF_WARN; |
| 279 | #ifndef NTRACE |
| 280 | af |= AF_TRACE; |
| 281 | #endif |
| 282 | if (f & f_foreground) |
| 283 | af |= AF_FOREGROUND; |
| 284 | a_create(STDIN_FILENO, STDOUT_FILENO, af); |
| 285 | a_switcherr(); |
| 286 | } |
| 287 | |
| 288 | p_init(); |
| 289 | for (i = 0; i < N(tunnels); i++) |
| 290 | if (p_addtun(tunnels[i])) exit(EXIT_FAILURE); |
| 291 | if (dflt) p_setdflttun(dflt); |
| 292 | if (p_bind(ailist)) exit(EXIT_FAILURE); |
| 293 | freeaddrinfo(ailist); |
| 294 | |
| 295 | for (i = 0; tunnels[i]; i++) { |
| 296 | if (tunnels[i]->flags&TUNF_PRIVOPEN) { |
| 297 | if (ps_split(f & f_daemon)) exit(EXIT_FAILURE); |
| 298 | break; |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | if (a_init()) exit(EXIT_FAILURE); |
| 303 | a_signals(); |
| 304 | if (a_listen(csock, u, g, csockmode)) exit(EXIT_FAILURE); |
| 305 | u_setugid(u, g); |
| 306 | if (km_init(kr_priv, kr_pub, tag_priv)) exit(EXIT_FAILURE); |
| 307 | kx_init(); |
| 308 | if (f & f_daemon) { |
| 309 | if (daemonize()) { |
| 310 | a_warn("SERVER", "daemon-error", "?ERRNO", A_END); |
| 311 | exit(EXIT_FAILURE); |
| 312 | } |
| 313 | a_daemon(); |
| 314 | a_switcherr(); |
| 315 | } |
| 316 | |
| 317 | lp_run(); |
| 318 | |
| 319 | p_destroyall(); |
| 320 | p_unbind(); |
| 321 | a_unlisten(); |
| 322 | km_clear(); |
| 323 | ps_quit(); |
| 324 | return (0); |
| 325 | } |
| 326 | |
| 327 | /*----- That's all, folks -------------------------------------------------*/ |