3 * $Id: tripe.c,v 1.12 2003/11/29 23:49:32 mdw Exp $
7 * (c) 2001 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Trivial IP Encryption (TrIPE).
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.
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.
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.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.12 2003/11/29 23:49:32 mdw
35 * Revision 1.11 2003/05/17 11:02:03 mdw
36 * Document the new `-b' option.
38 * Revision 1.10 2003/05/16 12:09:03 mdw
39 * Allow binding to a chosen address.
41 * Revision 1.9 2003/04/15 14:11:09 mdw
42 * Rationalize the behaviour of the `-G' and `-U' options.
44 * Revision 1.8 2002/01/13 17:28:29 mdw
45 * Don't turn tracing on if tracing is turned off (!).
47 * Revision 1.7 2002/01/13 17:14:05 mdw
48 * Don't include the tracing option in the help if not compiled in.
50 * Revision 1.6 2001/06/19 22:08:37 mdw
51 * Moved buffers to peer.c.
53 * Revision 1.5 2001/02/16 21:43:12 mdw
54 * Provide a more helpful usage message.
56 * Revision 1.4 2001/02/16 21:41:31 mdw
59 * Revision 1.3 2001/02/04 17:10:40 mdw
60 * Remove a debugging @abort@ call.
62 * Revision 1.2 2001/02/03 22:33:00 mdw
63 * Stuff more randomness into the pool in the interval timer.
65 * Revision 1.1 2001/02/03 20:26:37 mdw
70 /*----- Header files ------------------------------------------------------*/
74 /*----- Global variables --------------------------------------------------*/
78 /*----- Static variables --------------------------------------------------*/
81 #define T_INTERVAL MIN(1)
83 /*----- Main code ---------------------------------------------------------*/
85 /* --- @interval@ --- *
87 * Arguments: @struct timeval *tv@ = time when called
88 * @void *v@ = boring pointer
92 * Use: Called periodically to do housekeeping tasks.
95 void interval(struct timeval *tv, void *v)
98 T( trace(T_PEER, "peer: interval timer"); )
99 rand_seed(RAND_GLOBAL, HASHSZ);
102 tvv.tv_sec += T_INTERVAL;
103 sel_addtimer(&sel, &it, &tvv, interval, v);
108 * Arguments: @int argc@ = number of command line arguments
109 * @char *argv[]@ = vector of arguments
111 * Returns: Zero if OK, nonzero on error.
113 * Use: Main program. Provides a simple VPN.
116 static void usage(FILE *fp)
118 pquis(fp, "Usage: $ [-D] [-d dir] [-b addr] [-p port]\n\
119 [-U user] [-G group] [-a socket] [-T trace-opts]\n\
120 [-k priv-keyring] [-K pub-keyring] [-t key-tag]\n");
123 static void version(FILE *fp)
125 pquis(fp, "$, version " VERSION "\n");
128 static void help(FILE *fp)
136 -h, --help Display this help text.\n\
137 -v, --version Display version number.\n\
138 -u, --usage Display pointless usage message.\n\
140 -D, --daemon Run in the background.\n\
141 -d, --directory=DIR Switch to directory DIR [default " CONFIGDIR "].\n\
142 -b, --bind-address=ADDR Bind UDP socket to this IP ADDR.\n\
143 -p, --port=PORT Select UDP port to listen to.\n\
144 -U, --setuid=USER Set uid to USER after initialization.\n\
145 -G, --setgid=GROUP Set gid to GROUP after initialization.\n\
146 -k, --priv-keyring=FILE Get private key from FILE.\n\
147 -K, --pub-keyring=FILE Get public keys from FILE.\n\
148 -t, --tag=KEYTAG Use private key labelled TAG.\n\
149 -a, --admin-socket=FILE Use FILE as the adminstration socket.\n\
151 -T, --trace=OPTIONS Turn on tracing options.\n\
156 int main(int argc, char *argv[])
158 const char *kr_priv = "keyring", *kr_pub = "keyring.pub";
159 const char *tag_priv = "tripe-dh";
160 const char *csock = SOCKETDIR "/tripesock";
161 const char *dir = CONFIGDIR;
164 struct in_addr baddr = { INADDR_ANY };
173 T( trace_on(stderr, 0); )
175 if ((p = getenv("TRIPEDIR")) != 0)
179 static const struct option opts[] = {
180 { "help", 0, 0, 'h' },
181 { "version", 0, 0, 'v' },
182 { "usage", 0, 0, 'u' },
184 { "daemon", 0, 0, 'D' },
185 { "uid", OPTF_ARGREQ, 0, 'U' },
186 { "setuid", OPTF_ARGREQ, 0, 'U' },
187 { "gid", OPTF_ARGREQ, 0, 'G' },
188 { "setgid", OPTF_ARGREQ, 0, 'G' },
189 { "bind-address", OPTF_ARGREQ, 0, 'b' },
190 { "port", OPTF_ARGREQ, 0, 'p' },
191 { "directory", OPTF_ARGREQ, 0, 'd' },
192 { "priv-keyring", OPTF_ARGREQ, 0, 'k' },
193 { "pub-keyring", OPTF_ARGREQ, 0, 'K' },
194 { "tag", OPTF_ARGREQ, 0, 't' },
195 { "admin-socket", OPTF_ARGREQ, 0, 'a' },
197 { "trace", OPTF_ARGREQ, 0, 'T' },
200 { "tunnel", 0, 0, '0' },
204 int i = mdwopt(argc, argv, "hvu DU:G: b:p:d:k:K:t:a:" T("T:"),
225 unsigned long i = strtoul(optarg, &p, 0);
229 pw = getpwnam(optarg);
231 die(EXIT_FAILURE, "user `%s' not found", optarg);
239 unsigned long i = strtoul(optarg, &p, 0);
243 gr = getgrnam(optarg);
245 die(EXIT_FAILURE, "group `%s' not found", optarg);
250 struct hostent *h = gethostbyname(optarg);
252 die(EXIT_FAILURE, "unknown host name `%s'", optarg);
253 memcpy(&baddr, h->h_addr, sizeof(struct in_addr));
257 unsigned long i = strtoul(optarg, &p, 0);
259 struct servent *s = getservbyname(optarg, "udp");
261 die(EXIT_FAILURE, "unknown service name `%s'", optarg);
262 i = ntohs(s->s_port);
264 if (i == 0 || i >= 65536)
265 die(EXIT_FAILURE, "bad port number %lu", i);
285 tr_flags = traceopt(tr_opts, optarg, tr_flags, 0);
286 trace_level(tr_flags);
290 static const char *tun[] = { "notdef", "unet", "bsd", "linux" };
300 if (optind < argc || (f & f_bogus)) {
306 die(EXIT_FAILURE, "can't set current directory to `%s': %s",
307 dir, strerror(errno));
312 rand_noisesrc(RAND_GLOBAL, &noise_source);
313 rand_seed(RAND_GLOBAL, RMD160_HASHSZ);
314 signal(SIGPIPE, SIG_IGN);
318 a_create(STDIN_FILENO, STDOUT_FILENO);
319 if (g != (gid_t)-1) {
320 if (setgid(g) || (getuid() == 0 && setgroups(1, &g))) {
321 die(EXIT_FAILURE, "couldn't setgid to %u: %s",
322 (unsigned)g, strerror(errno));
325 if (u != (uid_t)-1) {
327 die(EXIT_FAILURE, "couldn't setuid to %u: %s",
328 (unsigned)u, strerror(errno));
331 km_init(kr_priv, kr_pub, tag_priv);
335 die(EXIT_FAILURE, "couldn't become a daemon: %s", strerror(errno));
341 tv.tv_sec = time(0) + T_INTERVAL;
343 sel_addtimer(&sel, &it, &tv, interval, 0);
349 if (!sel_select(&sel))
351 else if (errno != EINTR && errno != EAGAIN) {
352 a_warn("select failed: %s", strerror(errno));
355 a_warn("too many select errors: bailing out");
365 /*----- That's all, folks -------------------------------------------------*/