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