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