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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: tripe.c,v 1.7 2002/01/13 17:14:05 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 1.7 2002/01/13 17:14:05 mdw |
33 | * Don't include the tracing option in the help if not compiled in. |
34 | * |
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35 | * Revision 1.6 2001/06/19 22:08:37 mdw |
36 | * Moved buffers to peer.c. |
37 | * |
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38 | * Revision 1.5 2001/02/16 21:43:12 mdw |
39 | * Provide a more helpful usage message. |
40 | * |
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41 | * Revision 1.4 2001/02/16 21:41:31 mdw |
42 | * Add a new buffer. |
43 | * |
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44 | * Revision 1.3 2001/02/04 17:10:40 mdw |
45 | * Remove a debugging @abort@ call. |
46 | * |
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47 | * Revision 1.2 2001/02/03 22:33:00 mdw |
48 | * Stuff more randomness into the pool in the interval timer. |
49 | * |
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50 | * Revision 1.1 2001/02/03 20:26:37 mdw |
51 | * Initial checkin. |
52 | * |
53 | */ |
54 | |
55 | /*----- Header files ------------------------------------------------------*/ |
56 | |
57 | #include "tripe.h" |
58 | |
59 | /*----- Global variables --------------------------------------------------*/ |
60 | |
61 | sel_state sel; |
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62 | |
63 | /*----- Static variables --------------------------------------------------*/ |
64 | |
65 | static sel_timer it; |
66 | #define T_INTERVAL MIN(1) |
67 | |
68 | /*----- Main code ---------------------------------------------------------*/ |
69 | |
70 | /* --- @interval@ --- * |
71 | * |
72 | * Arguments: @struct timeval *tv@ = time when called |
73 | * @void *v@ = boring pointer |
74 | * |
75 | * Returns: --- |
76 | * |
77 | * Use: Called periodically to do housekeeping tasks. |
78 | */ |
79 | |
80 | void interval(struct timeval *tv, void *v) |
81 | { |
82 | struct timeval tvv; |
83 | T( trace(T_PEER, "peer: interval timer"); ) |
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84 | rand_seed(RAND_GLOBAL, HASHSZ); |
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85 | p_interval(); |
86 | tvv = *tv; |
87 | tvv.tv_sec += T_INTERVAL; |
88 | sel_addtimer(&sel, &it, &tvv, interval, v); |
89 | } |
90 | |
91 | /* --- @main@ --- * |
92 | * |
93 | * Arguments: @int argc@ = number of command line arguments |
94 | * @char *argv[]@ = vector of arguments |
95 | * |
96 | * Returns: Zero if OK, nonzero on error. |
97 | * |
98 | * Use: Main program. Provides a simple VPN. |
99 | */ |
100 | |
101 | static void usage(FILE *fp) |
102 | { |
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103 | pquis(fp, "Usage: $ [-D] [-p port] [-T trace-opts] [-d dir] [-a socket]\n\ |
104 | [-k priv-keyring] [-K pub-keyring] [-t key-tag]\n"); |
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105 | } |
106 | |
107 | static void version(FILE *fp) |
108 | { |
109 | pquis(fp, "$, version " VERSION "\n"); |
110 | } |
111 | |
112 | static void help(FILE *fp) |
113 | { |
114 | version(fp); |
115 | fputc('\n', fp); |
116 | usage(fp); |
117 | fputs("\n\ |
118 | Options:\n\ |
119 | \n\ |
120 | -h, --help Display this help text.\n\ |
121 | -v, --version Display version number.\n\ |
122 | -u, --usage Display pointless usage message.\n\ |
123 | \n\ |
124 | -D, --daemon Run in the background.\n\ |
125 | -d, --directory=DIR Switch to directory DIR (default $TRIPEDIR).\n\ |
126 | -p, --port=PORT Select UDP port to listen to.\n\ |
127 | -k, --priv-keyring=FILE Get private key from FILE.\n\ |
128 | -K, --pub-keyring=FILE Get public keys from FILE.\n\ |
129 | -t, --tag=KEYTAG Use private key labelled TAG.\n\ |
130 | -a, --admin-socket=FILE Use FILE as the adminstration socket.\n\ |
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131 | " T( "\ |
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132 | -T, --trace=OPTIONS Turn on tracing options.\n\ |
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133 | " ) "\ |
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134 | ", fp); |
135 | } |
136 | |
137 | int main(int argc, char *argv[]) |
138 | { |
139 | const char *kr_priv = "keyring", *kr_pub = "keyring.pub"; |
140 | const char *tag_priv = "tripe-dh"; |
141 | const char *csock = "tripesock"; |
142 | const char *dir = "/var/lib/tripe"; |
143 | const char *p; |
144 | unsigned port = 0; |
145 | unsigned f = 0; |
146 | uid_t u = -1; |
147 | gid_t g = -1; |
148 | |
149 | #define f_bogus 1u |
150 | #define f_daemon 2u |
151 | |
152 | ego(argv[0]); |
153 | trace_on(stderr, 0); |
154 | |
155 | if ((p = getenv("TRIPEDIR")) != 0) |
156 | dir = p; |
157 | |
158 | for (;;) { |
159 | static const struct option opts[] = { |
160 | { "help", 0, 0, 'h' }, |
161 | { "version", 0, 0, 'v' }, |
162 | { "usage", 0, 0, 'u' }, |
163 | |
164 | { "daemon", 0, 0, 'D' }, |
165 | { "uid", OPTF_ARGREQ, 0, 'U' }, |
166 | { "setuid", OPTF_ARGREQ, 0, 'U' }, |
167 | { "gid", OPTF_ARGREQ, 0, 'G' }, |
168 | { "setgid", OPTF_ARGREQ, 0, 'G' }, |
169 | { "port", OPTF_ARGREQ, 0, 'p' }, |
170 | { "directory", OPTF_ARGREQ, 0, 'd' }, |
171 | { "priv-keyring", OPTF_ARGREQ, 0, 'k' }, |
172 | { "pub-keyring", OPTF_ARGREQ, 0, 'K' }, |
173 | { "tag", OPTF_ARGREQ, 0, 't' }, |
174 | { "admin-socket", OPTF_ARGREQ, 0, 'a' }, |
175 | #ifndef NTRACE |
176 | { "trace", OPTF_ARGREQ, 0, 'T' }, |
177 | #endif |
178 | |
179 | { 0, 0, 0, 0 } |
180 | }; |
181 | |
182 | int i = mdwopt(argc, argv, "hvu DU:G: p:d:k:K:t:a:" T("T:"), |
183 | opts, 0, 0, 0); |
184 | if (i < 0) |
185 | break; |
186 | switch (i) { |
187 | case 'h': |
188 | help(stdout); |
189 | exit(0); |
190 | case 'v': |
191 | version(stdout); |
192 | exit(0); |
193 | case 'u': |
194 | usage(stdout); |
195 | exit(0); |
196 | |
197 | case 'D': |
198 | f |= f_daemon; |
199 | break; |
200 | case 'U': { |
201 | char *p; |
202 | unsigned long i = strtoul(optarg, &p, 0); |
203 | if (!*p) |
204 | u = i; |
205 | else { |
206 | struct passwd *pw; |
207 | if ((pw = getpwnam(optarg)) == 0) |
208 | die(EXIT_FAILURE, "user name `%s' not found", optarg); |
209 | u = pw->pw_uid; |
210 | } |
211 | } break; |
212 | case 'G': { |
213 | char *p; |
214 | unsigned long i = strtoul(optarg, &p, 0); |
215 | if (!*p) |
216 | g = i; |
217 | else { |
218 | struct group *gr; |
219 | if ((gr = getgrnam(optarg)) == 0) |
220 | die(EXIT_FAILURE, "group name `%s' not found", optarg); |
221 | g = gr->gr_gid; |
222 | } |
223 | } break; |
224 | |
225 | case 'p': { |
226 | char *p; |
227 | unsigned long i = strtoul(optarg, &p, 0); |
228 | if (*p) { |
229 | struct servent *s = getservbyname(optarg, "udp"); |
230 | if (!s) |
231 | die(EXIT_FAILURE, "unknown service name `%s'", optarg); |
232 | i = ntohs(s->s_port); |
233 | } |
234 | if (i == 0 || i >= 65536) |
235 | die(EXIT_FAILURE, "bad port number %lu", i); |
236 | port = i; |
237 | } break; |
238 | case 'd': |
239 | dir = optarg; |
240 | break; |
241 | case 'k': |
242 | kr_priv = optarg; |
243 | break; |
244 | case 'K': |
245 | kr_pub = optarg; |
246 | break; |
247 | case 'a': |
248 | csock = optarg; |
249 | break; |
250 | case 't': |
251 | tag_priv = optarg; |
252 | break; |
253 | #ifndef NTRACE |
254 | case 'T': |
255 | tr_flags = traceopt(tr_opts, optarg, tr_flags, 0); |
256 | trace_level(tr_flags); |
257 | break; |
258 | #endif |
259 | default: |
260 | f |= f_bogus; |
261 | break; |
262 | } |
263 | } |
264 | |
265 | if (optind < argc || (f & f_bogus)) { |
266 | usage(stderr); |
267 | exit(EXIT_FAILURE); |
268 | } |
269 | |
270 | if (chdir(dir)) { |
271 | die(EXIT_FAILURE, "can't set current directory to `%s': %s", |
272 | dir, strerror(errno)); |
273 | } |
274 | |
275 | sel_init(&sel); |
276 | sig_init(&sel); |
277 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
278 | rand_seed(RAND_GLOBAL, RMD160_HASHSZ); |
279 | signal(SIGPIPE, SIG_IGN); |
280 | tun_init(); |
281 | p_init(port); |
282 | if (!(f & f_daemon)) |
283 | a_create(STDIN_FILENO, STDOUT_FILENO); |
284 | if (g != -1) { |
285 | if (setgid(g)) { |
286 | die(EXIT_FAILURE, "couldn't setgid to %u: %s", |
287 | (unsigned)g, strerror(errno)); |
288 | } |
289 | } |
290 | if (u != -1) { |
291 | if (setuid(u)) { |
292 | die(EXIT_FAILURE, "couldn't setuid to %u: %s", |
293 | (unsigned)u, strerror(errno)); |
294 | } |
295 | } |
296 | km_init(kr_priv, kr_pub, tag_priv); |
297 | a_init(csock); |
298 | if (f & f_daemon) { |
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299 | if (u_daemon()) |
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300 | die(EXIT_FAILURE, "couldn't become a daemon: %s", strerror(errno)); |
301 | a_daemon(); |
302 | } |
303 | |
304 | { |
305 | struct timeval tv; |
306 | tv.tv_sec = time(0) + T_INTERVAL; |
307 | tv.tv_usec = 0; |
308 | sel_addtimer(&sel, &it, &tv, interval, 0); |
309 | } |
310 | |
311 | { |
312 | int selerr = 0; |
313 | for (;;) { |
314 | if (!sel_select(&sel)) |
315 | selerr = 0; |
316 | else if (errno != EINTR && errno != EAGAIN) { |
317 | a_warn("select failed: %s", strerror(errno)); |
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318 | selerr++; |
319 | if (selerr > 8) { |
320 | a_warn("too many select errors: bailing out"); |
321 | a_quit(); |
322 | } |
323 | } |
324 | } |
325 | } |
326 | |
327 | return (0); |
328 | } |
329 | |
330 | /*----- That's all, folks -------------------------------------------------*/ |