410c8acf |
1 | /* -*-c-*- |
2 | * |
dd9647cc |
3 | * $Id: client.c,v 1.12 2003/10/15 09:29:38 mdw Exp $ |
410c8acf |
4 | * |
5 | * Client for TrIPE |
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: client.c,v $ |
dd9647cc |
32 | * Revision 1.12 2003/10/15 09:29:38 mdw |
33 | * Cosmetic fix to changelog comment. |
34 | * |
7ed14135 |
35 | * Revision 1.11 2003/07/13 11:19:49 mdw |
dd9647cc |
36 | * Incompatible protocol fix! Include message type code under MAC tag to |
37 | * prevent cut-and-paste from key-exchange messages to general packet |
38 | * transport. |
7ed14135 |
39 | * |
a803add7 |
40 | * Revision 1.10 2003/05/17 10:59:19 mdw |
41 | * Put a newline in the pidfile. |
42 | * |
6be88c14 |
43 | * Revision 1.9 2002/01/13 14:57:18 mdw |
44 | * Track @lbuf@ changes in mLib. |
45 | * |
d071d798 |
46 | * Revision 1.8 2001/06/19 22:09:37 mdw |
47 | * Move the program name to the right place when constructing the arguments |
48 | * to pass to a new server. |
49 | * |
06b2a088 |
50 | * Revision 1.7 2001/02/22 09:07:54 mdw |
51 | * Write a pidfile on request, and delete it when finished. |
52 | * |
fa4bef80 |
53 | * Revision 1.6 2001/02/22 09:06:08 mdw |
54 | * Fix logfile rotation to avoid program collapse. |
55 | * |
5f5150b1 |
56 | * Revision 1.5 2001/02/16 21:23:39 mdw |
57 | * Use reliable signal handling for reopening logs. |
58 | * |
7fadfa0d |
59 | * Revision 1.4 2001/02/06 09:34:53 mdw |
60 | * Change ERR response to FAIL for consistency with other programs. |
61 | * |
9dd01bc6 |
62 | * Revision 1.3 2001/02/04 17:10:15 mdw |
63 | * Reopen logfiles on receipt of @SIGHUP@ (not done very well). Don't |
64 | * change directory -- just mangle pathnames instead. |
65 | * |
73189848 |
66 | * Revision 1.2 2001/02/04 01:17:54 mdw |
67 | * Create a configuration header file to tidy up command lines. |
68 | * |
410c8acf |
69 | * Revision 1.1 2001/02/03 20:26:37 mdw |
70 | * Initial checkin. |
71 | * |
72 | */ |
73 | |
74 | /*----- Header files ------------------------------------------------------*/ |
75 | |
73189848 |
76 | #include "config.h" |
77 | |
410c8acf |
78 | #include <ctype.h> |
79 | #include <errno.h> |
80 | #include <signal.h> |
81 | #include <stdio.h> |
82 | #include <stdlib.h> |
83 | #include <string.h> |
84 | #include <time.h> |
85 | |
86 | #include <sys/types.h> |
87 | #include <sys/time.h> |
88 | #include <unistd.h> |
89 | #include <fcntl.h> |
90 | #include <sys/wait.h> |
91 | #include <syslog.h> |
92 | |
93 | #include <sys/socket.h> |
94 | #include <sys/un.h> |
95 | #include <arpa/inet.h> |
96 | #include <netdb.h> |
97 | |
98 | #include <mLib/alloc.h> |
99 | #include <mLib/darray.h> |
100 | #include <mLib/dstr.h> |
410c8acf |
101 | #include <mLib/mdwopt.h> |
102 | #include <mLib/quis.h> |
103 | #include <mLib/report.h> |
104 | #include <mLib/sel.h> |
105 | #include <mLib/selbuf.h> |
5f5150b1 |
106 | #include <mLib/sig.h> |
410c8acf |
107 | #include <mLib/str.h> |
108 | |
109 | #include "util.h" |
110 | |
111 | #undef sun |
112 | |
113 | /*----- Data structures ---------------------------------------------------*/ |
114 | |
115 | #ifndef STRING_V |
116 | # define STRING_V |
117 | DA_DECL(string_v, char *); |
118 | #endif |
119 | |
120 | /*----- Static variables --------------------------------------------------*/ |
121 | |
06b2a088 |
122 | static const char *pidfile = 0; |
123 | static const char *logname = 0; |
410c8acf |
124 | static FILE *logfp = 0; |
125 | static unsigned f = 0; |
126 | static int fd; |
127 | |
128 | #define f_bogus 1u |
129 | #define f_spawn 2u |
130 | #define f_daemon 4u |
131 | #define f_spawnopts 8u |
132 | #define f_syslog 16u |
133 | #define f_command 32u |
134 | #define f_noinput 64u |
135 | #define f_warn 128u |
136 | #define f_uclose 256u |
137 | |
138 | /*----- Main code ---------------------------------------------------------*/ |
139 | |
140 | static void reap(int sig) |
141 | { |
410c8acf |
142 | int e = errno; |
06b2a088 |
143 | while (waitpid(-1, 0, WNOHANG) > 0) |
410c8acf |
144 | ; |
145 | errno = e; |
146 | } |
147 | |
148 | static void writelog(const char *cat, const char *msg) |
149 | { |
150 | char buf[256]; |
151 | time_t t = time(0); |
152 | struct tm *tm = localtime(&t); |
153 | strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm); |
154 | fprintf(logfp, "%s %s: %s\n", buf, cat, msg); |
155 | } |
156 | |
6be88c14 |
157 | static void cline(char *p, size_t len, void *b) |
410c8acf |
158 | { |
159 | char *q; |
160 | if (!p) { |
161 | if (f & f_command) |
162 | die(EXIT_FAILURE, "server dropped the connection"); |
163 | exit(0); |
164 | } |
165 | q = str_getword(&p); |
166 | if (!q) |
167 | return; |
168 | if (strcmp(q, "WARN") == 0) { |
169 | if (f & f_syslog) |
170 | syslog(LOG_WARNING, "%s", p); |
171 | if (logfp) |
172 | writelog("warning", p); |
173 | if (f & f_warn) |
174 | fprintf(stderr, "Warning: %s\n", p); |
175 | } else if (strcmp(q, "TRACE") == 0) { |
176 | if (f & f_syslog) |
177 | syslog(LOG_DEBUG, "%s", p); |
178 | if (logfp) |
179 | writelog("debug", p); |
180 | } else if (!(f & f_command)) { |
181 | if (f & f_syslog) |
182 | syslog(LOG_ERR, "unexpected output `%s %s'", q, p); |
183 | if (logfp) { |
184 | dstr d = DSTR_INIT; |
185 | dstr_putf(&d, "unexpected output `%s %s'", q, p); |
186 | writelog("error", d.buf); |
187 | dstr_destroy(&d); |
188 | } |
7fadfa0d |
189 | } else if (strcmp(q, "FAIL") == 0) |
410c8acf |
190 | die(EXIT_FAILURE, "%s", p); |
191 | else if (strcmp(q, "INFO") == 0) |
192 | puts(p); |
193 | else if (strcmp(q, "OK") == 0) |
194 | exit(0); |
195 | else |
196 | die(EXIT_FAILURE, "unexpected output `%s %s'", q, p); |
197 | } |
198 | |
6be88c14 |
199 | static void sline(char *p, size_t len, void *b) |
410c8acf |
200 | { |
201 | if (!p) { |
202 | if (!(f & f_uclose)) |
203 | moan("server closed the connection"); |
204 | exit(0); |
205 | } |
206 | puts(p); |
207 | } |
208 | |
6be88c14 |
209 | static void uline(char *p, size_t len, void *b) |
410c8acf |
210 | { |
410c8acf |
211 | if (!p) { |
212 | selbuf_destroy(b); |
213 | shutdown(fd, 1); |
214 | f |= f_uclose; |
215 | } else { |
6be88c14 |
216 | p[len] = '\n'; |
217 | write(fd, p, len + 1); |
410c8acf |
218 | } |
219 | } |
220 | |
9dd01bc6 |
221 | static void logfile(const char *name) |
222 | { |
fa4bef80 |
223 | FILE *fp; |
224 | |
225 | if ((fp = fopen(name, "a")) != 0) { |
226 | if (logfp) |
227 | fclose(logfp); |
228 | logfp = fp; |
229 | setvbuf(logfp, 0, _IOLBF, BUFSIZ); |
230 | } else { |
231 | dstr d = DSTR_INIT; |
232 | dstr_putf(&d, "error opening logfile `%s': %s", name, strerror(errno)); |
233 | if (logfp) |
234 | writelog("error", d.buf); |
235 | else if (logname) |
236 | die(EXIT_FAILURE, d.buf); |
237 | if (f & f_syslog) |
238 | syslog(LOG_ERR, d.buf); |
239 | dstr_destroy(&d); |
9dd01bc6 |
240 | } |
9dd01bc6 |
241 | } |
242 | |
5f5150b1 |
243 | static void sighup(int sig, void *v) |
244 | { |
245 | logfile(logname); |
246 | } |
247 | |
06b2a088 |
248 | static void cleanup(void) |
249 | { |
250 | if (pidfile) |
251 | unlink(pidfile); |
252 | } |
253 | |
254 | static void sigdie(int sig) |
255 | { |
256 | cleanup(); |
257 | signal(sig, SIG_DFL); |
258 | raise(sig); |
259 | } |
260 | |
410c8acf |
261 | static void version(FILE *fp) |
262 | { |
263 | pquis(fp, "$, TrIPE version " VERSION "\n"); |
264 | } |
265 | |
266 | static void usage(FILE *fp) |
267 | { |
268 | pquis(fp, "\ |
269 | Usage:\n\ |
270 | $ [-w] [-options] [command [args]...]\n\ |
271 | $ [-Dl] [-f file] [-options]\n\ |
272 | Options:\n\ |
06b2a088 |
273 | [-s] [-d directory] [-a socket] [-P pidfile]\n\ |
274 | [-p program] [-S arg,arg,...]\n\ |
410c8acf |
275 | "); |
276 | } |
277 | |
278 | static void help(FILE *fp) |
279 | { |
280 | version(fp); |
281 | fputc('\n', fp); |
282 | usage(fp); |
283 | fputs("\ |
284 | \n\ |
285 | Options in full:\n\ |
286 | \n\ |
287 | -h, --help Show this help text.\n\ |
288 | -v, --version Show version number.\n\ |
289 | -u, --usage Show brief usage message.\n\ |
290 | \n\ |
291 | -D, --daemon Become a background task after connecting.\n\ |
292 | -d, --directory=DIR Select current directory [default /var/lib/tripe]\n\ |
293 | -a, --admin-socket=FILE Select socket to connect to.\n\ |
06b2a088 |
294 | -P, --pidfile=FILE Write process-id to FILE.\n\ |
410c8acf |
295 | \n\ |
296 | -s, --spawn Start server rather than connecting.\n\ |
297 | -p, --spawn-path=PATH Specify path to executable.\n\ |
298 | -S, --spawn-args=ARGS Specify comma-separated arguments.\n\ |
299 | \n\ |
300 | -l, --syslog Log messages to system log.\n\ |
301 | -f, --logfile=FILE Log messages to FILE.\n\ |
302 | -w, --warnings Show warnings when running commands.\n\ |
303 | ", fp); |
304 | } |
305 | |
306 | int main(int argc, char *argv[]) |
307 | { |
308 | const char *dir = "/var/lib/tripe"; |
309 | const char *sock = "tripesock"; |
310 | const char *spawnpath = "tripe"; |
311 | string_v spawnopts = DA_INIT; |
312 | char *p; |
06b2a088 |
313 | FILE *pidfp = 0; |
410c8acf |
314 | |
315 | ego(argv[0]); |
316 | |
317 | if ((p = getenv("TRIPEDIR")) != 0) |
318 | dir = p; |
319 | |
320 | /* --- Parse the arguments --- */ |
321 | |
322 | for (;;) { |
323 | static const struct option opts[] = { |
324 | { "help", 0, 0, 'h' }, |
325 | { "version", 0, 0, 'v' }, |
326 | { "usage", 0, 0, 'u' }, |
327 | { "daemon", 0, 0, 'D' }, |
328 | { "directory", OPTF_ARGREQ, 0, 'd' }, |
329 | { "admin-socket", OPTF_ARGREQ, 0, 'a' }, |
330 | { "spawn", 0, 0, 's' }, |
331 | { "spawn-path", OPTF_ARGREQ, 0, 'p' }, |
332 | { "spawn-args", OPTF_ARGREQ, 0, 'S' }, |
333 | { "syslog", 0, 0, 'l' }, |
334 | { "logfile", OPTF_ARGREQ, 0, 'f' }, |
335 | { "warnings", 0, 0, 'w' }, |
06b2a088 |
336 | { "pidfile", OPTF_ARGREQ, 0, 'P' }, |
410c8acf |
337 | { 0, 0, 0, 0 } |
338 | }; |
339 | |
06b2a088 |
340 | int i = mdwopt(argc, argv, "+hvuDd:a:sp:S:lwf:nP:", opts, 0, 0, 0); |
410c8acf |
341 | if (i < 0) |
342 | break; |
343 | switch (i) { |
344 | case 'h': |
345 | help(stdout); |
346 | exit(0); |
347 | case 'v': |
348 | version(stdout); |
349 | exit(0); |
350 | case 'u': |
351 | usage(stdout); |
352 | exit(0); |
353 | case 'D': |
354 | f |= f_daemon | f_noinput; |
355 | break; |
356 | case 'd': |
357 | dir = optarg; |
358 | break; |
359 | case 'a': |
360 | sock = optarg; |
361 | break; |
362 | case 's': |
363 | f |= f_spawn; |
364 | break; |
365 | case 'p': |
366 | f |= f_spawn; |
367 | spawnpath = optarg; |
368 | break; |
369 | case 'S': |
370 | f |= f_spawn | f_spawnopts; |
371 | for (p = strtok(optarg, ","); p; p = strtok(0, ",")) |
372 | DA_PUSH(&spawnopts, p); |
373 | break; |
374 | case 'l': |
375 | f |= f_syslog | f_noinput; |
376 | break; |
377 | case 'w': |
378 | f |= f_warn; |
379 | break; |
380 | case 'f': |
9dd01bc6 |
381 | logname = optarg; |
410c8acf |
382 | f |= f_noinput; |
383 | break; |
06b2a088 |
384 | case 'P': |
385 | pidfile = optarg; |
386 | break; |
410c8acf |
387 | default: |
388 | f |= f_bogus; |
389 | break; |
390 | } |
391 | } |
392 | if ((f & f_bogus) || ((f & f_noinput) && optind < argc)) { |
393 | usage(stderr); |
394 | exit(EXIT_FAILURE); |
395 | } |
396 | |
06b2a088 |
397 | /* --- Set various things up --- */ |
398 | |
399 | if (chdir(dir)) { |
400 | die(EXIT_FAILURE, "couldn't set `%s' as current directory: %s", |
401 | dir, strerror(errno)); |
402 | } |
403 | if (logname) |
404 | logfile(logname); |
405 | if (!pidfile && (f & f_daemon) && ((f & f_syslog) || logname)) |
406 | pidfile = "tripectl.pid"; |
407 | if (pidfile && (pidfp = fopen(pidfile, "w")) == 0) { |
408 | die(EXIT_FAILURE, "couldn't open `%s' for writing: %s", |
409 | pidfile, strerror(errno)); |
410 | } |
411 | signal(SIGINT, sigdie); |
412 | signal(SIGQUIT, sigdie); |
413 | signal(SIGTERM, sigdie); |
414 | atexit(cleanup); |
415 | |
410c8acf |
416 | /* --- Connect to the server --- */ |
417 | |
418 | if (f & f_spawn) { |
419 | int pfd[2]; |
420 | pid_t kid; |
421 | struct sigaction sa; |
422 | sigset_t newmask, oldmask; |
423 | |
424 | sa.sa_handler = reap; |
425 | sigemptyset(&sa.sa_mask); |
426 | sa.sa_flags = SA_NOCLDSTOP; |
427 | #ifdef SA_RESTART |
428 | sa.sa_flags |= SA_RESTART; |
429 | #endif |
430 | sigaction(SIGCHLD, &sa, 0); |
431 | |
06b2a088 |
432 | DA_UNSHIFT(&spawnopts, (char *)sock); |
433 | DA_UNSHIFT(&spawnopts, "-a"); |
434 | DA_UNSHIFT(&spawnopts, "-d."); |
d071d798 |
435 | DA_UNSHIFT(&spawnopts, (char *)spawnpath); |
410c8acf |
436 | DA_PUSH(&spawnopts, 0); |
437 | if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd)) |
438 | die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno)); |
439 | sigemptyset(&newmask); |
440 | sigaddset(&newmask, SIGCHLD); |
441 | sigprocmask(SIG_BLOCK, &newmask, &oldmask); |
442 | if ((kid = fork()) < 0) |
443 | die(EXIT_FAILURE, "fork failed: %s", strerror(errno)); |
444 | if (!kid) { |
445 | dup2(pfd[1], STDIN_FILENO); |
446 | dup2(pfd[1], STDOUT_FILENO); |
447 | close(pfd[1]); |
448 | close(pfd[0]); |
9dd01bc6 |
449 | if (logfp) |
450 | fclose(logfp); |
7ed14135 |
451 | if (pidfp) |
452 | fclose(pidfp); |
9dd01bc6 |
453 | closelog(); |
06b2a088 |
454 | if (f & f_daemon) |
455 | u_detach(); |
410c8acf |
456 | execvp(DA(&spawnopts)[0], DA(&spawnopts)); |
457 | die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno)); |
458 | } |
459 | sigprocmask(SIG_SETMASK, &oldmask, 0); |
460 | fd = pfd[0]; |
461 | close(pfd[1]); |
462 | } else { |
463 | struct sockaddr_un sun; |
464 | size_t sz = strlen(sock) + 1; |
06b2a088 |
465 | if (sz > sizeof(sun.sun_path)) |
410c8acf |
466 | die(EXIT_FAILURE, "socket name `%s' too long", sock); |
467 | memset(&sun, 0, sizeof(sun)); |
468 | sun.sun_family = AF_UNIX; |
06b2a088 |
469 | memcpy(sun.sun_path, sock, sz); |
470 | sz = sz + offsetof(struct sockaddr_un, sun_path); |
410c8acf |
471 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
472 | die(EXIT_FAILURE, "error making socket: %s", strerror(errno)); |
473 | if (connect(fd, (struct sockaddr *)&sun, sz)) { |
474 | die(EXIT_FAILURE, "error connecting to `%s': %s", |
9dd01bc6 |
475 | sun.sun_path, strerror(errno)); |
410c8acf |
476 | } |
477 | } |
478 | |
479 | if (f & f_daemon) { |
480 | if (u_daemon()) |
481 | die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno)); |
482 | } |
06b2a088 |
483 | if (pidfp) { |
a803add7 |
484 | fprintf(pidfp, "%li\n", (long)getpid()); |
06b2a088 |
485 | fclose(pidfp); |
486 | } |
410c8acf |
487 | |
488 | /* --- If we're meant to be interactive, do that --- */ |
489 | |
490 | if (!(f & f_noinput) && optind == argc) { |
491 | sel_state sel; |
492 | selbuf bu, bs; |
493 | |
494 | sel_init(&sel); |
495 | selbuf_init(&bu, &sel, STDIN_FILENO, uline, &bu); |
496 | selbuf_init(&bs, &sel, fd, sline, &bs); |
497 | for (;;) { |
5f5150b1 |
498 | if (sel_select(&sel) && errno != EINTR && errno != EAGAIN) |
410c8acf |
499 | die(EXIT_FAILURE, "select failed: %s", strerror(errno)); |
500 | } |
501 | } |
502 | |
503 | /* --- If there's a command, submit it --- */ |
504 | |
505 | if (optind < argc) { |
506 | dstr d = DSTR_INIT; |
507 | dstr_puts(&d, argv[optind++]); |
508 | while (optind < argc) { |
509 | dstr_putc(&d, ' '); |
510 | dstr_puts(&d, argv[optind++]); |
511 | } |
512 | dstr_putc(&d, '\n'); |
513 | write(fd, d.buf, d.len); |
514 | shutdown(fd, 1); |
515 | dstr_destroy(&d); |
516 | f |= f_command; |
517 | } |
518 | |
519 | /* --- Pull everything else out of the box --- */ |
520 | |
521 | { |
5f5150b1 |
522 | sel_state sel; |
523 | selbuf b; |
524 | sig hup; |
525 | |
526 | sel_init(&sel); |
527 | selbuf_init(&b, &sel, fd, cline, 0); |
528 | |
410c8acf |
529 | if (f & f_syslog) |
530 | openlog(QUIS, 0, LOG_DAEMON); |
9dd01bc6 |
531 | if (logfp) { |
5f5150b1 |
532 | sig_init(&sel); |
533 | sig_add(&hup, SIGHUP, sighup, 0); |
9dd01bc6 |
534 | } |
410c8acf |
535 | for (;;) { |
5f5150b1 |
536 | if (sel_select(&sel) && errno != EINTR && errno != EAGAIN) |
537 | die(EXIT_FAILURE, "select failed: %s", strerror(errno)); |
410c8acf |
538 | } |
410c8acf |
539 | } |
540 | |
541 | return (0); |
542 | } |
543 | |
544 | /*----- That's all, folks -------------------------------------------------*/ |