410c8acf |
1 | /* -*-c-*- |
2 | * |
2d752320 |
3 | * $Id$ |
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 | |
410c8acf |
29 | /*----- Header files ------------------------------------------------------*/ |
30 | |
73189848 |
31 | #include "config.h" |
32 | |
410c8acf |
33 | #include <ctype.h> |
34 | #include <errno.h> |
35 | #include <signal.h> |
36 | #include <stdio.h> |
37 | #include <stdlib.h> |
38 | #include <string.h> |
39 | #include <time.h> |
40 | |
41 | #include <sys/types.h> |
42 | #include <sys/time.h> |
43 | #include <unistd.h> |
44 | #include <fcntl.h> |
45 | #include <sys/wait.h> |
46 | #include <syslog.h> |
47 | |
48 | #include <sys/socket.h> |
49 | #include <sys/un.h> |
50 | #include <arpa/inet.h> |
51 | #include <netdb.h> |
52 | |
53 | #include <mLib/alloc.h> |
54 | #include <mLib/darray.h> |
55 | #include <mLib/dstr.h> |
410c8acf |
56 | #include <mLib/mdwopt.h> |
57 | #include <mLib/quis.h> |
58 | #include <mLib/report.h> |
59 | #include <mLib/sel.h> |
60 | #include <mLib/selbuf.h> |
5f5150b1 |
61 | #include <mLib/sig.h> |
410c8acf |
62 | #include <mLib/str.h> |
63 | |
64 | #include "util.h" |
65 | |
66 | #undef sun |
67 | |
68 | /*----- Data structures ---------------------------------------------------*/ |
69 | |
70 | #ifndef STRING_V |
71 | # define STRING_V |
72 | DA_DECL(string_v, char *); |
73 | #endif |
74 | |
75 | /*----- Static variables --------------------------------------------------*/ |
76 | |
06b2a088 |
77 | static const char *pidfile = 0; |
78 | static const char *logname = 0; |
410c8acf |
79 | static FILE *logfp = 0; |
80 | static unsigned f = 0; |
81 | static int fd; |
de014da6 |
82 | static const char *bgtag = 0; |
410c8acf |
83 | |
84 | #define f_bogus 1u |
85 | #define f_spawn 2u |
86 | #define f_daemon 4u |
87 | #define f_spawnopts 8u |
88 | #define f_syslog 16u |
89 | #define f_command 32u |
90 | #define f_noinput 64u |
91 | #define f_warn 128u |
92 | #define f_uclose 256u |
93 | |
94 | /*----- Main code ---------------------------------------------------------*/ |
95 | |
96 | static void reap(int sig) |
97 | { |
410c8acf |
98 | int e = errno; |
06b2a088 |
99 | while (waitpid(-1, 0, WNOHANG) > 0) |
410c8acf |
100 | ; |
101 | errno = e; |
102 | } |
103 | |
104 | static void writelog(const char *cat, const char *msg) |
105 | { |
106 | char buf[256]; |
107 | time_t t = time(0); |
108 | struct tm *tm = localtime(&t); |
109 | strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm); |
110 | fprintf(logfp, "%s %s: %s\n", buf, cat, msg); |
111 | } |
112 | |
de014da6 |
113 | static void checkbg(char **p) |
114 | { |
115 | char *q = str_getword(p); |
116 | if (!q) |
117 | die(EXIT_FAILURE, "missing background tag"); |
118 | if (!bgtag || strcmp(bgtag, q) != 0) |
119 | die(EXIT_FAILURE, "unexpected background tag `%s'", q); |
120 | } |
121 | |
122 | static void checkfg(void) |
123 | { |
124 | if (bgtag) |
125 | die(EXIT_FAILURE, "unexpected foreground response"); |
126 | } |
127 | |
6be88c14 |
128 | static void cline(char *p, size_t len, void *b) |
410c8acf |
129 | { |
130 | char *q; |
131 | if (!p) { |
132 | if (f & f_command) |
133 | die(EXIT_FAILURE, "server dropped the connection"); |
134 | exit(0); |
135 | } |
136 | q = str_getword(&p); |
137 | if (!q) |
138 | return; |
139 | if (strcmp(q, "WARN") == 0) { |
140 | if (f & f_syslog) |
141 | syslog(LOG_WARNING, "%s", p); |
142 | if (logfp) |
143 | writelog("warning", p); |
144 | if (f & f_warn) |
145 | fprintf(stderr, "Warning: %s\n", p); |
146 | } else if (strcmp(q, "TRACE") == 0) { |
147 | if (f & f_syslog) |
148 | syslog(LOG_DEBUG, "%s", p); |
149 | if (logfp) |
150 | writelog("debug", p); |
151 | } else if (!(f & f_command)) { |
152 | if (f & f_syslog) |
153 | syslog(LOG_ERR, "unexpected output `%s %s'", q, p); |
154 | if (logfp) { |
155 | dstr d = DSTR_INIT; |
156 | dstr_putf(&d, "unexpected output `%s %s'", q, p); |
157 | writelog("error", d.buf); |
158 | dstr_destroy(&d); |
159 | } |
de014da6 |
160 | } else if (strcmp(q, "FAIL") == 0) { |
161 | checkfg(); |
410c8acf |
162 | die(EXIT_FAILURE, "%s", p); |
de014da6 |
163 | } else if (strcmp(q, "INFO") == 0) { |
164 | checkfg(); |
410c8acf |
165 | puts(p); |
de014da6 |
166 | } else if (strcmp(q, "OK") == 0) { |
167 | checkfg(); |
168 | exit(0); |
169 | } else if (strcmp(q, "BGDETACH") == 0) { |
170 | if (bgtag) |
171 | die(EXIT_FAILURE, "repeat detach"); |
172 | bgtag = xstrdup(p); |
173 | } else if (strcmp(q, "BGOK") == 0) { |
174 | checkbg(&p); |
410c8acf |
175 | exit(0); |
de014da6 |
176 | } else if (strcmp(q, "BGINFO") == 0) { |
177 | checkbg(&p); |
178 | puts(p); |
179 | } else if (strcmp(q, "BGFAIL") == 0) { |
180 | checkbg(&p); |
181 | die(EXIT_FAILURE, "%s", p); |
182 | } else |
410c8acf |
183 | die(EXIT_FAILURE, "unexpected output `%s %s'", q, p); |
184 | } |
185 | |
6be88c14 |
186 | static void sline(char *p, size_t len, void *b) |
410c8acf |
187 | { |
188 | if (!p) { |
189 | if (!(f & f_uclose)) |
190 | moan("server closed the connection"); |
191 | exit(0); |
192 | } |
193 | puts(p); |
194 | } |
195 | |
6be88c14 |
196 | static void uline(char *p, size_t len, void *b) |
410c8acf |
197 | { |
410c8acf |
198 | if (!p) { |
199 | selbuf_destroy(b); |
200 | shutdown(fd, 1); |
201 | f |= f_uclose; |
202 | } else { |
6be88c14 |
203 | p[len] = '\n'; |
3cdc3f3a |
204 | errno = EIO; |
205 | if (write(fd, p, len + 1) != len + 1) |
206 | moan("write failed: %s", strerror(errno)); |
207 | } |
208 | } |
209 | |
210 | static void setup(const char *cmd) |
211 | { |
212 | dstr d = DSTR_INIT; |
213 | char ch; |
214 | char *p, *q; |
215 | int n; |
216 | |
217 | dstr_puts(&d, cmd); |
218 | dstr_putc(&d, '\n'); |
219 | errno = EIO; /* Relax: be vague */ |
220 | if (write(fd, d.buf, d.len) != d.len) { |
221 | die(EXIT_FAILURE, "error sending setup command `%s': %s", |
222 | cmd, strerror(errno)); |
223 | } |
224 | dstr_reset(&d); |
225 | for (;;) { |
226 | n = read(fd, &ch, 1); |
227 | if (!n) |
228 | die(EXIT_FAILURE, "unexpected EOF during setup"); |
229 | if (n < 0) { |
230 | die(EXIT_FAILURE, "error receiving reply to `%s': %s", |
231 | cmd, strerror(errno)); |
232 | } |
233 | if (d.len < 256) |
234 | dstr_putc(&d, ch); |
235 | if (ch == '\n') { |
236 | p = d.buf; |
237 | q = str_getword(&p); |
238 | if (!q) |
239 | ; |
240 | else if (strcmp(q, "OK") == 0) |
241 | return; |
242 | else if (strcmp(q, "FAIL") == 0) |
243 | die(EXIT_FAILURE, "setup command `%s' failed: %s", cmd, p); |
244 | dstr_reset(&d); |
245 | } |
410c8acf |
246 | } |
247 | } |
248 | |
9dd01bc6 |
249 | static void logfile(const char *name) |
250 | { |
fa4bef80 |
251 | FILE *fp; |
252 | |
253 | if ((fp = fopen(name, "a")) != 0) { |
254 | if (logfp) |
255 | fclose(logfp); |
256 | logfp = fp; |
257 | setvbuf(logfp, 0, _IOLBF, BUFSIZ); |
258 | } else { |
259 | dstr d = DSTR_INIT; |
260 | dstr_putf(&d, "error opening logfile `%s': %s", name, strerror(errno)); |
261 | if (logfp) |
262 | writelog("error", d.buf); |
263 | else if (logname) |
264 | die(EXIT_FAILURE, d.buf); |
265 | if (f & f_syslog) |
266 | syslog(LOG_ERR, d.buf); |
267 | dstr_destroy(&d); |
9dd01bc6 |
268 | } |
9dd01bc6 |
269 | } |
270 | |
f98df549 |
271 | static void sighup(int sig, void *v) { logfile(logname); } |
5f5150b1 |
272 | |
06b2a088 |
273 | static void cleanup(void) |
274 | { |
275 | if (pidfile) |
276 | unlink(pidfile); |
277 | } |
278 | |
279 | static void sigdie(int sig) |
280 | { |
281 | cleanup(); |
282 | signal(sig, SIG_DFL); |
283 | raise(sig); |
284 | } |
285 | |
410c8acf |
286 | static void version(FILE *fp) |
f98df549 |
287 | { pquis(fp, "$, TrIPE version " VERSION "\n"); } |
410c8acf |
288 | |
289 | static void usage(FILE *fp) |
290 | { |
291 | pquis(fp, "\ |
292 | Usage:\n\ |
2d752320 |
293 | $ [-w] [-OPTIONS] [COMMAND [ARGS]...]\n\ |
294 | $ [-Dl] [-f FILE] [-OPTIONS]\n\ |
410c8acf |
295 | Options:\n\ |
2d752320 |
296 | [-s] [-d DIRECTORY] [-a SOCKET] [-P PIDFILE]\n\ |
297 | [-p PROGRAM] [-S ARG,ARG,...]\n\ |
410c8acf |
298 | "); |
299 | } |
300 | |
301 | static void help(FILE *fp) |
302 | { |
303 | version(fp); |
304 | fputc('\n', fp); |
305 | usage(fp); |
306 | fputs("\ |
307 | \n\ |
308 | Options in full:\n\ |
309 | \n\ |
310 | -h, --help Show this help text.\n\ |
311 | -v, --version Show version number.\n\ |
312 | -u, --usage Show brief usage message.\n\ |
313 | \n\ |
314 | -D, --daemon Become a background task after connecting.\n\ |
ef4a1ab7 |
315 | -d, --directory=DIR Select current directory [default " CONFIGDIR "].\n\ |
3cdc3f3a |
316 | -a, --admin-socket=FILE Select socket to connect to\n\ |
ef4a1ab7 |
317 | [default " SOCKETDIR "/tripesock].\n\ |
06b2a088 |
318 | -P, --pidfile=FILE Write process-id to FILE.\n\ |
410c8acf |
319 | \n\ |
320 | -s, --spawn Start server rather than connecting.\n\ |
321 | -p, --spawn-path=PATH Specify path to executable.\n\ |
322 | -S, --spawn-args=ARGS Specify comma-separated arguments.\n\ |
323 | \n\ |
324 | -l, --syslog Log messages to system log.\n\ |
325 | -f, --logfile=FILE Log messages to FILE.\n\ |
326 | -w, --warnings Show warnings when running commands.\n\ |
327 | ", fp); |
328 | } |
329 | |
330 | int main(int argc, char *argv[]) |
331 | { |
ef4a1ab7 |
332 | const char *dir = CONFIGDIR; |
333 | const char *sock = SOCKETDIR "/tripesock"; |
410c8acf |
334 | const char *spawnpath = "tripe"; |
335 | string_v spawnopts = DA_INIT; |
336 | char *p; |
06b2a088 |
337 | FILE *pidfp = 0; |
410c8acf |
338 | |
339 | ego(argv[0]); |
340 | |
341 | if ((p = getenv("TRIPEDIR")) != 0) |
342 | dir = p; |
343 | |
344 | /* --- Parse the arguments --- */ |
345 | |
346 | for (;;) { |
347 | static const struct option opts[] = { |
348 | { "help", 0, 0, 'h' }, |
349 | { "version", 0, 0, 'v' }, |
350 | { "usage", 0, 0, 'u' }, |
351 | { "daemon", 0, 0, 'D' }, |
352 | { "directory", OPTF_ARGREQ, 0, 'd' }, |
353 | { "admin-socket", OPTF_ARGREQ, 0, 'a' }, |
354 | { "spawn", 0, 0, 's' }, |
355 | { "spawn-path", OPTF_ARGREQ, 0, 'p' }, |
356 | { "spawn-args", OPTF_ARGREQ, 0, 'S' }, |
357 | { "syslog", 0, 0, 'l' }, |
358 | { "logfile", OPTF_ARGREQ, 0, 'f' }, |
359 | { "warnings", 0, 0, 'w' }, |
06b2a088 |
360 | { "pidfile", OPTF_ARGREQ, 0, 'P' }, |
410c8acf |
361 | { 0, 0, 0, 0 } |
362 | }; |
363 | |
06b2a088 |
364 | int i = mdwopt(argc, argv, "+hvuDd:a:sp:S:lwf:nP:", opts, 0, 0, 0); |
410c8acf |
365 | if (i < 0) |
366 | break; |
367 | switch (i) { |
368 | case 'h': |
369 | help(stdout); |
370 | exit(0); |
371 | case 'v': |
372 | version(stdout); |
373 | exit(0); |
374 | case 'u': |
375 | usage(stdout); |
376 | exit(0); |
377 | case 'D': |
378 | f |= f_daemon | f_noinput; |
379 | break; |
380 | case 'd': |
381 | dir = optarg; |
382 | break; |
383 | case 'a': |
384 | sock = optarg; |
385 | break; |
386 | case 's': |
387 | f |= f_spawn; |
388 | break; |
389 | case 'p': |
390 | f |= f_spawn; |
391 | spawnpath = optarg; |
392 | break; |
393 | case 'S': |
394 | f |= f_spawn | f_spawnopts; |
395 | for (p = strtok(optarg, ","); p; p = strtok(0, ",")) |
396 | DA_PUSH(&spawnopts, p); |
397 | break; |
398 | case 'l': |
399 | f |= f_syslog | f_noinput; |
400 | break; |
401 | case 'w': |
402 | f |= f_warn; |
403 | break; |
404 | case 'f': |
9dd01bc6 |
405 | logname = optarg; |
410c8acf |
406 | f |= f_noinput; |
407 | break; |
06b2a088 |
408 | case 'P': |
409 | pidfile = optarg; |
410 | break; |
410c8acf |
411 | default: |
412 | f |= f_bogus; |
413 | break; |
414 | } |
415 | } |
416 | if ((f & f_bogus) || ((f & f_noinput) && optind < argc)) { |
417 | usage(stderr); |
418 | exit(EXIT_FAILURE); |
419 | } |
420 | |
06b2a088 |
421 | /* --- Set various things up --- */ |
422 | |
423 | if (chdir(dir)) { |
424 | die(EXIT_FAILURE, "couldn't set `%s' as current directory: %s", |
425 | dir, strerror(errno)); |
426 | } |
427 | if (logname) |
428 | logfile(logname); |
429 | if (!pidfile && (f & f_daemon) && ((f & f_syslog) || logname)) |
430 | pidfile = "tripectl.pid"; |
431 | if (pidfile && (pidfp = fopen(pidfile, "w")) == 0) { |
432 | die(EXIT_FAILURE, "couldn't open `%s' for writing: %s", |
433 | pidfile, strerror(errno)); |
434 | } |
435 | signal(SIGINT, sigdie); |
436 | signal(SIGQUIT, sigdie); |
437 | signal(SIGTERM, sigdie); |
438 | atexit(cleanup); |
439 | |
410c8acf |
440 | /* --- Connect to the server --- */ |
441 | |
442 | if (f & f_spawn) { |
443 | int pfd[2]; |
444 | pid_t kid; |
445 | struct sigaction sa; |
446 | sigset_t newmask, oldmask; |
447 | |
448 | sa.sa_handler = reap; |
449 | sigemptyset(&sa.sa_mask); |
450 | sa.sa_flags = SA_NOCLDSTOP; |
451 | #ifdef SA_RESTART |
452 | sa.sa_flags |= SA_RESTART; |
453 | #endif |
454 | sigaction(SIGCHLD, &sa, 0); |
455 | |
06b2a088 |
456 | DA_UNSHIFT(&spawnopts, (char *)sock); |
457 | DA_UNSHIFT(&spawnopts, "-a"); |
458 | DA_UNSHIFT(&spawnopts, "-d."); |
d071d798 |
459 | DA_UNSHIFT(&spawnopts, (char *)spawnpath); |
410c8acf |
460 | DA_PUSH(&spawnopts, 0); |
461 | if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd)) |
462 | die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno)); |
463 | sigemptyset(&newmask); |
464 | sigaddset(&newmask, SIGCHLD); |
465 | sigprocmask(SIG_BLOCK, &newmask, &oldmask); |
466 | if ((kid = fork()) < 0) |
467 | die(EXIT_FAILURE, "fork failed: %s", strerror(errno)); |
468 | if (!kid) { |
469 | dup2(pfd[1], STDIN_FILENO); |
470 | dup2(pfd[1], STDOUT_FILENO); |
471 | close(pfd[1]); |
472 | close(pfd[0]); |
9dd01bc6 |
473 | if (logfp) |
474 | fclose(logfp); |
7ed14135 |
475 | if (pidfp) |
476 | fclose(pidfp); |
9dd01bc6 |
477 | closelog(); |
06b2a088 |
478 | if (f & f_daemon) |
479 | u_detach(); |
410c8acf |
480 | execvp(DA(&spawnopts)[0], DA(&spawnopts)); |
481 | die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno)); |
482 | } |
483 | sigprocmask(SIG_SETMASK, &oldmask, 0); |
484 | fd = pfd[0]; |
485 | close(pfd[1]); |
486 | } else { |
487 | struct sockaddr_un sun; |
488 | size_t sz = strlen(sock) + 1; |
06b2a088 |
489 | if (sz > sizeof(sun.sun_path)) |
410c8acf |
490 | die(EXIT_FAILURE, "socket name `%s' too long", sock); |
491 | memset(&sun, 0, sizeof(sun)); |
492 | sun.sun_family = AF_UNIX; |
06b2a088 |
493 | memcpy(sun.sun_path, sock, sz); |
494 | sz = sz + offsetof(struct sockaddr_un, sun_path); |
410c8acf |
495 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
496 | die(EXIT_FAILURE, "error making socket: %s", strerror(errno)); |
497 | if (connect(fd, (struct sockaddr *)&sun, sz)) { |
498 | die(EXIT_FAILURE, "error connecting to `%s': %s", |
9dd01bc6 |
499 | sun.sun_path, strerror(errno)); |
410c8acf |
500 | } |
501 | } |
502 | |
503 | if (f & f_daemon) { |
504 | if (u_daemon()) |
505 | die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno)); |
506 | } |
06b2a088 |
507 | if (pidfp) { |
a803add7 |
508 | fprintf(pidfp, "%li\n", (long)getpid()); |
06b2a088 |
509 | fclose(pidfp); |
510 | } |
3cdc3f3a |
511 | signal(SIGPIPE, SIG_IGN); |
410c8acf |
512 | |
513 | /* --- If we're meant to be interactive, do that --- */ |
514 | |
3cdc3f3a |
515 | if (optind == argc) |
516 | setup("WATCH -A+tw"); |
410c8acf |
517 | if (!(f & f_noinput) && optind == argc) { |
518 | sel_state sel; |
519 | selbuf bu, bs; |
520 | |
521 | sel_init(&sel); |
522 | selbuf_init(&bu, &sel, STDIN_FILENO, uline, &bu); |
523 | selbuf_init(&bs, &sel, fd, sline, &bs); |
524 | for (;;) { |
5f5150b1 |
525 | if (sel_select(&sel) && errno != EINTR && errno != EAGAIN) |
410c8acf |
526 | die(EXIT_FAILURE, "select failed: %s", strerror(errno)); |
527 | } |
528 | } |
529 | |
530 | /* --- If there's a command, submit it --- */ |
531 | |
532 | if (optind < argc) { |
533 | dstr d = DSTR_INIT; |
3cdc3f3a |
534 | setup((f & f_warn) ? "WATCH -A+w" : "WATCH -A"); |
410c8acf |
535 | dstr_puts(&d, argv[optind++]); |
536 | while (optind < argc) { |
537 | dstr_putc(&d, ' '); |
538 | dstr_puts(&d, argv[optind++]); |
539 | } |
540 | dstr_putc(&d, '\n'); |
3cdc3f3a |
541 | errno = EIO; |
542 | if (write(fd, d.buf, d.len) != d.len || shutdown(fd, 1)) |
543 | die(EXIT_FAILURE, "write failed: %s", strerror(errno)); |
410c8acf |
544 | dstr_destroy(&d); |
545 | f |= f_command; |
546 | } |
547 | |
548 | /* --- Pull everything else out of the box --- */ |
549 | |
550 | { |
5f5150b1 |
551 | sel_state sel; |
552 | selbuf b; |
553 | sig hup; |
554 | |
555 | sel_init(&sel); |
556 | selbuf_init(&b, &sel, fd, cline, 0); |
557 | |
410c8acf |
558 | if (f & f_syslog) |
559 | openlog(QUIS, 0, LOG_DAEMON); |
9dd01bc6 |
560 | if (logfp) { |
5f5150b1 |
561 | sig_init(&sel); |
562 | sig_add(&hup, SIGHUP, sighup, 0); |
9dd01bc6 |
563 | } |
410c8acf |
564 | for (;;) { |
5f5150b1 |
565 | if (sel_select(&sel) && errno != EINTR && errno != EAGAIN) |
566 | die(EXIT_FAILURE, "select failed: %s", strerror(errno)); |
410c8acf |
567 | } |
410c8acf |
568 | } |
569 | |
570 | return (0); |
571 | } |
572 | |
573 | /*----- That's all, folks -------------------------------------------------*/ |