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1 | /* -*-c-*- |
2 | * |
ef4a1ab7 |
3 | * $Id: tripe.c,v 1.12 2003/11/29 23:49:32 mdw Exp $ |
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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 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: tripe.c,v $ |
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32 | * Revision 1.12 2003/11/29 23:49:32 mdw |
33 | * Debianization. |
34 | * |
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35 | * Revision 1.11 2003/05/17 11:02:03 mdw |
36 | * Document the new `-b' option. |
37 | * |
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38 | * Revision 1.10 2003/05/16 12:09:03 mdw |
39 | * Allow binding to a chosen address. |
40 | * |
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41 | * Revision 1.9 2003/04/15 14:11:09 mdw |
42 | * Rationalize the behaviour of the `-G' and `-U' options. |
43 | * |
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44 | * Revision 1.8 2002/01/13 17:28:29 mdw |
45 | * Don't turn tracing on if tracing is turned off (!). |
46 | * |
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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. |
49 | * |
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50 | * Revision 1.6 2001/06/19 22:08:37 mdw |
51 | * Moved buffers to peer.c. |
52 | * |
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53 | * Revision 1.5 2001/02/16 21:43:12 mdw |
54 | * Provide a more helpful usage message. |
55 | * |
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56 | * Revision 1.4 2001/02/16 21:41:31 mdw |
57 | * Add a new buffer. |
58 | * |
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59 | * Revision 1.3 2001/02/04 17:10:40 mdw |
60 | * Remove a debugging @abort@ call. |
61 | * |
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62 | * Revision 1.2 2001/02/03 22:33:00 mdw |
63 | * Stuff more randomness into the pool in the interval timer. |
64 | * |
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65 | * Revision 1.1 2001/02/03 20:26:37 mdw |
66 | * Initial checkin. |
67 | * |
68 | */ |
69 | |
70 | /*----- Header files ------------------------------------------------------*/ |
71 | |
72 | #include "tripe.h" |
73 | |
74 | /*----- Global variables --------------------------------------------------*/ |
75 | |
76 | sel_state sel; |
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77 | |
78 | /*----- Static variables --------------------------------------------------*/ |
79 | |
80 | static sel_timer it; |
81 | #define T_INTERVAL MIN(1) |
82 | |
83 | /*----- Main code ---------------------------------------------------------*/ |
84 | |
85 | /* --- @interval@ --- * |
86 | * |
87 | * Arguments: @struct timeval *tv@ = time when called |
88 | * @void *v@ = boring pointer |
89 | * |
90 | * Returns: --- |
91 | * |
92 | * Use: Called periodically to do housekeeping tasks. |
93 | */ |
94 | |
95 | void interval(struct timeval *tv, void *v) |
96 | { |
97 | struct timeval tvv; |
98 | T( trace(T_PEER, "peer: interval timer"); ) |
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99 | rand_seed(RAND_GLOBAL, HASHSZ); |
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100 | p_interval(); |
101 | tvv = *tv; |
102 | tvv.tv_sec += T_INTERVAL; |
103 | sel_addtimer(&sel, &it, &tvv, interval, v); |
104 | } |
105 | |
106 | /* --- @main@ --- * |
107 | * |
108 | * Arguments: @int argc@ = number of command line arguments |
109 | * @char *argv[]@ = vector of arguments |
110 | * |
111 | * Returns: Zero if OK, nonzero on error. |
112 | * |
113 | * Use: Main program. Provides a simple VPN. |
114 | */ |
115 | |
116 | static void usage(FILE *fp) |
117 | { |
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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"); |
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121 | } |
122 | |
123 | static void version(FILE *fp) |
124 | { |
125 | pquis(fp, "$, version " VERSION "\n"); |
126 | } |
127 | |
128 | static void help(FILE *fp) |
129 | { |
130 | version(fp); |
131 | fputc('\n', fp); |
132 | usage(fp); |
133 | fputs("\n\ |
134 | Options:\n\ |
135 | \n\ |
136 | -h, --help Display this help text.\n\ |
137 | -v, --version Display version number.\n\ |
138 | -u, --usage Display pointless usage message.\n\ |
139 | \n\ |
140 | -D, --daemon Run in the background.\n\ |
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141 | -d, --directory=DIR Switch to directory DIR [default " CONFIGDIR "].\n\ |
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142 | -b, --bind-address=ADDR Bind UDP socket to this IP ADDR.\n\ |
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143 | -p, --port=PORT Select UDP port to listen to.\n\ |
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144 | -U, --setuid=USER Set uid to USER after initialization.\n\ |
145 | -G, --setgid=GROUP Set gid to GROUP after initialization.\n\ |
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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\ |
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150 | " T( "\ |
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151 | -T, --trace=OPTIONS Turn on tracing options.\n\ |
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152 | " ) "\ |
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153 | ", fp); |
154 | } |
155 | |
156 | int main(int argc, char *argv[]) |
157 | { |
158 | const char *kr_priv = "keyring", *kr_pub = "keyring.pub"; |
159 | const char *tag_priv = "tripe-dh"; |
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160 | const char *csock = SOCKETDIR "/tripesock"; |
161 | const char *dir = CONFIGDIR; |
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162 | const char *p; |
163 | unsigned port = 0; |
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164 | struct in_addr baddr = { INADDR_ANY }; |
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165 | unsigned f = 0; |
166 | uid_t u = -1; |
167 | gid_t g = -1; |
168 | |
169 | #define f_bogus 1u |
170 | #define f_daemon 2u |
171 | |
172 | ego(argv[0]); |
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173 | T( trace_on(stderr, 0); ) |
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174 | |
175 | if ((p = getenv("TRIPEDIR")) != 0) |
176 | dir = p; |
177 | |
178 | for (;;) { |
179 | static const struct option opts[] = { |
180 | { "help", 0, 0, 'h' }, |
181 | { "version", 0, 0, 'v' }, |
182 | { "usage", 0, 0, 'u' }, |
183 | |
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' }, |
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189 | { "bind-address", OPTF_ARGREQ, 0, 'b' }, |
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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' }, |
196 | #ifndef NTRACE |
197 | { "trace", OPTF_ARGREQ, 0, 'T' }, |
198 | #endif |
199 | |
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200 | { "tunnel", 0, 0, '0' }, |
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201 | { 0, 0, 0, 0 } |
202 | }; |
203 | |
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204 | int i = mdwopt(argc, argv, "hvu DU:G: b:p:d:k:K:t:a:" T("T:"), |
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205 | opts, 0, 0, 0); |
206 | if (i < 0) |
207 | break; |
208 | switch (i) { |
209 | case 'h': |
210 | help(stdout); |
211 | exit(0); |
212 | case 'v': |
213 | version(stdout); |
214 | exit(0); |
215 | case 'u': |
216 | usage(stdout); |
217 | exit(0); |
218 | |
219 | case 'D': |
220 | f |= f_daemon; |
221 | break; |
222 | case 'U': { |
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223 | struct passwd *pw; |
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224 | char *p; |
225 | unsigned long i = strtoul(optarg, &p, 0); |
226 | if (!*p) |
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227 | pw = getpwuid(i); |
228 | else |
229 | pw = getpwnam(optarg); |
230 | if (!pw) |
231 | die(EXIT_FAILURE, "user `%s' not found", optarg); |
232 | u = pw->pw_uid; |
233 | if (g == -1) |
234 | g = pw->pw_gid; |
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235 | } break; |
236 | case 'G': { |
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237 | struct group *gr; |
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238 | char *p; |
239 | unsigned long i = strtoul(optarg, &p, 0); |
240 | if (!*p) |
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241 | gr = getgrgid(i); |
242 | else |
243 | gr = getgrnam(optarg); |
244 | if (!gr) |
245 | die(EXIT_FAILURE, "group `%s' not found", optarg); |
246 | g = gr->gr_gid; |
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247 | } break; |
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248 | |
249 | case 'b': { |
250 | struct hostent *h = gethostbyname(optarg); |
251 | if (!h) |
252 | die(EXIT_FAILURE, "unknown host name `%s'", optarg); |
253 | memcpy(&baddr, h->h_addr, sizeof(struct in_addr)); |
254 | } break; |
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255 | case 'p': { |
256 | char *p; |
257 | unsigned long i = strtoul(optarg, &p, 0); |
258 | if (*p) { |
259 | struct servent *s = getservbyname(optarg, "udp"); |
260 | if (!s) |
261 | die(EXIT_FAILURE, "unknown service name `%s'", optarg); |
262 | i = ntohs(s->s_port); |
263 | } |
264 | if (i == 0 || i >= 65536) |
265 | die(EXIT_FAILURE, "bad port number %lu", i); |
266 | port = i; |
267 | } break; |
268 | case 'd': |
269 | dir = optarg; |
270 | break; |
271 | case 'k': |
272 | kr_priv = optarg; |
273 | break; |
274 | case 'K': |
275 | kr_pub = optarg; |
276 | break; |
277 | case 'a': |
278 | csock = optarg; |
279 | break; |
280 | case 't': |
281 | tag_priv = optarg; |
282 | break; |
283 | #ifndef NTRACE |
284 | case 'T': |
285 | tr_flags = traceopt(tr_opts, optarg, tr_flags, 0); |
286 | trace_level(tr_flags); |
287 | break; |
288 | #endif |
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289 | case '0': { |
290 | static const char *tun[] = { "notdef", "unet", "bsd", "linux" }; |
291 | puts(tun[TUN_TYPE]); |
292 | exit(0); |
293 | } break; |
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294 | default: |
295 | f |= f_bogus; |
296 | break; |
297 | } |
298 | } |
299 | |
300 | if (optind < argc || (f & f_bogus)) { |
301 | usage(stderr); |
302 | exit(EXIT_FAILURE); |
303 | } |
304 | |
305 | if (chdir(dir)) { |
306 | die(EXIT_FAILURE, "can't set current directory to `%s': %s", |
307 | dir, strerror(errno)); |
308 | } |
309 | |
310 | sel_init(&sel); |
311 | sig_init(&sel); |
312 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
313 | rand_seed(RAND_GLOBAL, RMD160_HASHSZ); |
314 | signal(SIGPIPE, SIG_IGN); |
315 | tun_init(); |
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316 | p_init(baddr, port); |
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317 | if (!(f & f_daemon)) |
318 | a_create(STDIN_FILENO, STDOUT_FILENO); |
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319 | if (g != (gid_t)-1) { |
320 | if (setgid(g) || (getuid() == 0 && setgroups(1, &g))) { |
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321 | die(EXIT_FAILURE, "couldn't setgid to %u: %s", |
322 | (unsigned)g, strerror(errno)); |
323 | } |
324 | } |
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325 | if (u != (uid_t)-1) { |
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326 | if (setuid(u)) { |
327 | die(EXIT_FAILURE, "couldn't setuid to %u: %s", |
328 | (unsigned)u, strerror(errno)); |
329 | } |
330 | } |
331 | km_init(kr_priv, kr_pub, tag_priv); |
332 | a_init(csock); |
333 | if (f & f_daemon) { |
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334 | if (u_daemon()) |
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335 | die(EXIT_FAILURE, "couldn't become a daemon: %s", strerror(errno)); |
336 | a_daemon(); |
337 | } |
338 | |
339 | { |
340 | struct timeval tv; |
341 | tv.tv_sec = time(0) + T_INTERVAL; |
342 | tv.tv_usec = 0; |
343 | sel_addtimer(&sel, &it, &tv, interval, 0); |
344 | } |
345 | |
346 | { |
347 | int selerr = 0; |
348 | for (;;) { |
349 | if (!sel_select(&sel)) |
350 | selerr = 0; |
351 | else if (errno != EINTR && errno != EAGAIN) { |
352 | a_warn("select failed: %s", strerror(errno)); |
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353 | selerr++; |
354 | if (selerr > 8) { |
355 | a_warn("too many select errors: bailing out"); |
356 | a_quit(); |
357 | } |
358 | } |
359 | } |
360 | } |
361 | |
362 | return (0); |
363 | } |
364 | |
365 | /*----- That's all, folks -------------------------------------------------*/ |