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1 | /* -*-c-*- |
2 | * |
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3 | * $Id$ |
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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 | |
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29 | /*----- Header files ------------------------------------------------------*/ |
30 | |
31 | #include "tripe.h" |
32 | |
33 | /*----- Global variables --------------------------------------------------*/ |
34 | |
35 | sel_state sel; |
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36 | |
37 | /*----- Static variables --------------------------------------------------*/ |
38 | |
39 | static sel_timer it; |
40 | #define T_INTERVAL MIN(1) |
41 | |
42 | /*----- Main code ---------------------------------------------------------*/ |
43 | |
44 | /* --- @interval@ --- * |
45 | * |
46 | * Arguments: @struct timeval *tv@ = time when called |
47 | * @void *v@ = boring pointer |
48 | * |
49 | * Returns: --- |
50 | * |
51 | * Use: Called periodically to do housekeeping tasks. |
52 | */ |
53 | |
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54 | static void interval(struct timeval *tv, void *v) |
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55 | { |
56 | struct timeval tvv; |
57 | T( trace(T_PEER, "peer: interval timer"); ) |
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58 | rand_seed(RAND_GLOBAL, MAXHASHSZ); |
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59 | p_interval(); |
60 | tvv = *tv; |
61 | tvv.tv_sec += T_INTERVAL; |
62 | sel_addtimer(&sel, &it, &tvv, interval, v); |
63 | } |
64 | |
42da2a58 |
65 | /* --- @mystrieq@ --- * |
66 | * |
67 | * Arguments: @const char *x, *y@ = two strings |
68 | * |
69 | * Returns: True if @x@ and @y are equal, up to case. |
70 | */ |
71 | |
72 | int mystrieq(const char *x, const char *y) |
73 | { |
74 | for (;;) { |
75 | if (!*x && !*y) return (1); |
76 | if (tolower((unsigned char)*x) != tolower((unsigned char)*y)) |
77 | return (0); |
78 | x++; y++; |
79 | } |
80 | } |
81 | |
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82 | /* --- @main@ --- * |
83 | * |
84 | * Arguments: @int argc@ = number of command line arguments |
85 | * @char *argv[]@ = vector of arguments |
86 | * |
87 | * Returns: Zero if OK, nonzero on error. |
88 | * |
89 | * Use: Main program. Provides a simple VPN. |
90 | */ |
91 | |
92 | static void usage(FILE *fp) |
93 | { |
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94 | pquis(fp, "Usage: $ [-D] [-d DIR] [-b ADDR] [-p PORT] [-n TUNNEL]\n\ |
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95 | [-U USER] [-G GROUP] [-a SOCKET] [-T TRACE-OPTS]\n\ |
96 | [-k PRIV-KEYRING] [-K PUB-KEYRING] [-t KEY-TAG]\n"); |
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97 | } |
98 | |
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99 | static void version(FILE *fp) { pquis(fp, "$, version " VERSION "\n"); } |
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100 | |
101 | static void help(FILE *fp) |
102 | { |
103 | version(fp); |
104 | fputc('\n', fp); |
105 | usage(fp); |
106 | fputs("\n\ |
107 | Options:\n\ |
108 | \n\ |
109 | -h, --help Display this help text.\n\ |
110 | -v, --version Display version number.\n\ |
111 | -u, --usage Display pointless usage message.\n\ |
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112 | --tunnels Display IP tunnel drivers and exit.\n\ |
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113 | \n\ |
114 | -D, --daemon Run in the background.\n\ |
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115 | -d, --directory=DIR Switch to directory DIR [default " CONFIGDIR "].\n\ |
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116 | -b, --bind-address=ADDR Bind UDP socket to this IP ADDR.\n\ |
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117 | -p, --port=PORT Select UDP port to listen to.\n\ |
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118 | -n, --tunnel=TUNNEL Seelect default tunnel driver.\n\ |
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119 | -U, --setuid=USER Set uid to USER after initialization.\n\ |
120 | -G, --setgid=GROUP Set gid to GROUP after initialization.\n\ |
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121 | -k, --priv-keyring=FILE Get private key from FILE.\n\ |
122 | -K, --pub-keyring=FILE Get public keys from FILE.\n\ |
123 | -t, --tag=KEYTAG Use private key labelled TAG.\n\ |
124 | -a, --admin-socket=FILE Use FILE as the adminstration socket.\n\ |
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125 | " T( "\ |
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126 | -T, --trace=OPTIONS Turn on tracing options.\n\ |
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127 | " ) "\ |
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128 | ", fp); |
129 | } |
130 | |
131 | int main(int argc, char *argv[]) |
132 | { |
133 | const char *kr_priv = "keyring", *kr_pub = "keyring.pub"; |
134 | const char *tag_priv = "tripe-dh"; |
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135 | const char *csock = SOCKETDIR "/tripesock"; |
136 | const char *dir = CONFIGDIR; |
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137 | const char *p; |
138 | unsigned port = 0; |
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139 | struct in_addr baddr = { INADDR_ANY }; |
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140 | unsigned f = 0; |
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141 | int i; |
142 | int selerr = 0; |
143 | struct timeval tv; |
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144 | uid_t u = -1; |
145 | gid_t g = -1; |
146 | |
147 | #define f_bogus 1u |
148 | #define f_daemon 2u |
149 | |
150 | ego(argv[0]); |
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151 | T( trace_on(stderr, 0); ) |
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152 | |
153 | if ((p = getenv("TRIPEDIR")) != 0) |
154 | dir = p; |
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155 | tun_default = tunnels[0]; |
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156 | |
157 | for (;;) { |
158 | static const struct option opts[] = { |
159 | { "help", 0, 0, 'h' }, |
160 | { "version", 0, 0, 'v' }, |
161 | { "usage", 0, 0, 'u' }, |
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162 | { "tunnels", 0, 0, '0' }, |
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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' }, |
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169 | { "bind-address", OPTF_ARGREQ, 0, 'b' }, |
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170 | { "tunnel", OPTF_ARGREQ, 0, 'n' }, |
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171 | { "port", OPTF_ARGREQ, 0, 'p' }, |
172 | { "directory", OPTF_ARGREQ, 0, 'd' }, |
173 | { "priv-keyring", OPTF_ARGREQ, 0, 'k' }, |
174 | { "pub-keyring", OPTF_ARGREQ, 0, 'K' }, |
175 | { "tag", OPTF_ARGREQ, 0, 't' }, |
176 | { "admin-socket", OPTF_ARGREQ, 0, 'a' }, |
177 | #ifndef NTRACE |
178 | { "trace", OPTF_ARGREQ, 0, 'T' }, |
179 | #endif |
180 | |
181 | { 0, 0, 0, 0 } |
182 | }; |
183 | |
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184 | i = mdwopt(argc, argv, "hvuDU:G:b:p:d:k:K:t:a:" T("T:"), |
185 | opts, 0, 0, 0); |
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186 | if (i < 0) |
187 | break; |
188 | switch (i) { |
189 | case 'h': |
190 | help(stdout); |
191 | exit(0); |
192 | case 'v': |
193 | version(stdout); |
194 | exit(0); |
195 | case 'u': |
196 | usage(stdout); |
197 | exit(0); |
198 | |
199 | case 'D': |
200 | f |= f_daemon; |
201 | break; |
202 | case 'U': { |
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203 | struct passwd *pw; |
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204 | char *p; |
205 | unsigned long i = strtoul(optarg, &p, 0); |
206 | if (!*p) |
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207 | pw = getpwuid(i); |
208 | else |
209 | pw = getpwnam(optarg); |
210 | if (!pw) |
211 | die(EXIT_FAILURE, "user `%s' not found", optarg); |
212 | u = pw->pw_uid; |
213 | if (g == -1) |
214 | g = pw->pw_gid; |
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215 | } break; |
216 | case 'G': { |
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217 | struct group *gr; |
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218 | char *p; |
219 | unsigned long i = strtoul(optarg, &p, 0); |
220 | if (!*p) |
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221 | gr = getgrgid(i); |
222 | else |
223 | gr = getgrnam(optarg); |
224 | if (!gr) |
225 | die(EXIT_FAILURE, "group `%s' not found", optarg); |
226 | g = gr->gr_gid; |
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227 | } break; |
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228 | |
229 | case 'b': { |
230 | struct hostent *h = gethostbyname(optarg); |
231 | if (!h) |
232 | die(EXIT_FAILURE, "unknown host name `%s'", optarg); |
233 | memcpy(&baddr, h->h_addr, sizeof(struct in_addr)); |
234 | } break; |
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235 | case 'p': { |
236 | char *p; |
237 | unsigned long i = strtoul(optarg, &p, 0); |
238 | if (*p) { |
239 | struct servent *s = getservbyname(optarg, "udp"); |
240 | if (!s) |
241 | die(EXIT_FAILURE, "unknown service name `%s'", optarg); |
242 | i = ntohs(s->s_port); |
243 | } |
244 | if (i == 0 || i >= 65536) |
245 | die(EXIT_FAILURE, "bad port number %lu", i); |
246 | port = i; |
247 | } break; |
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248 | case 'n': { |
249 | int i; |
250 | for (i = 0;; i++) { |
251 | if (!tunnels[i]) |
252 | die(EXIT_FAILURE, "unknown tunnel `%s'", optarg); |
253 | if (mystrieq(optarg, tunnels[i]->name)) |
254 | break; |
255 | } |
256 | tun_default = tunnels[i]; |
257 | } break; |
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258 | case 'd': |
259 | dir = optarg; |
260 | break; |
261 | case 'k': |
262 | kr_priv = optarg; |
263 | break; |
264 | case 'K': |
265 | kr_pub = optarg; |
266 | break; |
267 | case 'a': |
268 | csock = optarg; |
269 | break; |
270 | case 't': |
271 | tag_priv = optarg; |
272 | break; |
273 | #ifndef NTRACE |
274 | case 'T': |
275 | tr_flags = traceopt(tr_opts, optarg, tr_flags, 0); |
276 | trace_level(tr_flags); |
277 | break; |
278 | #endif |
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279 | case '0': { |
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280 | int i; |
281 | for (i = 0; tunnels[i]; i++) |
282 | puts(tunnels[i]->name); |
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283 | exit(0); |
284 | } break; |
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285 | default: |
286 | f |= f_bogus; |
287 | break; |
288 | } |
289 | } |
290 | |
291 | if (optind < argc || (f & f_bogus)) { |
292 | usage(stderr); |
293 | exit(EXIT_FAILURE); |
294 | } |
295 | |
296 | if (chdir(dir)) { |
297 | die(EXIT_FAILURE, "can't set current directory to `%s': %s", |
298 | dir, strerror(errno)); |
299 | } |
300 | |
301 | sel_init(&sel); |
302 | sig_init(&sel); |
303 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
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304 | rand_seed(RAND_GLOBAL, MAXHASHSZ); |
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305 | signal(SIGPIPE, SIG_IGN); |
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306 | for (i = 0; tunnels[i]; i++) |
307 | tunnels[i]->init(); |
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308 | p_init(baddr, port); |
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309 | if (!(f & f_daemon)) { |
310 | #ifndef NTRACE |
311 | a_create(STDIN_FILENO, STDOUT_FILENO, AF_TRACE | AF_WARN); |
312 | #else |
313 | a_create(STDIN_FILENO, STDOUT_FILENO, AF_WARN); |
314 | #endif |
315 | } |
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316 | if (g != (gid_t)-1) { |
317 | if (setgid(g) || (getuid() == 0 && setgroups(1, &g))) { |
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318 | die(EXIT_FAILURE, "couldn't setgid to %u: %s", |
319 | (unsigned)g, strerror(errno)); |
320 | } |
321 | } |
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322 | if (u != (uid_t)-1) { |
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323 | if (setuid(u)) { |
324 | die(EXIT_FAILURE, "couldn't setuid to %u: %s", |
325 | (unsigned)u, strerror(errno)); |
326 | } |
327 | } |
328 | km_init(kr_priv, kr_pub, tag_priv); |
329 | a_init(csock); |
330 | if (f & f_daemon) { |
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331 | if (u_daemon()) |
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332 | die(EXIT_FAILURE, "couldn't become a daemon: %s", strerror(errno)); |
333 | a_daemon(); |
334 | } |
335 | |
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336 | tv.tv_sec = time(0) + T_INTERVAL; |
337 | tv.tv_usec = 0; |
338 | sel_addtimer(&sel, &it, &tv, interval, 0); |
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339 | |
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340 | for (;;) { |
341 | if (!sel_select(&sel)) |
342 | selerr = 0; |
343 | else if (errno != EINTR && errno != EAGAIN) { |
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344 | a_warn("SERVER", "select-error", "?ERRNO", A_END); |
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345 | selerr++; |
346 | if (selerr > 8) { |
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347 | a_warn("ABORT", "repeated-select-errors", A_END); |
42da2a58 |
348 | abort(); |
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349 | } |
350 | } |
351 | } |
352 | |
353 | return (0); |
354 | } |
355 | |
356 | /*----- That's all, folks -------------------------------------------------*/ |