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; |
82 | |
83 | #define f_bogus 1u |
84 | #define f_spawn 2u |
85 | #define f_daemon 4u |
86 | #define f_spawnopts 8u |
87 | #define f_syslog 16u |
88 | #define f_command 32u |
89 | #define f_noinput 64u |
90 | #define f_warn 128u |
91 | #define f_uclose 256u |
92 | |
93 | /*----- Main code ---------------------------------------------------------*/ |
94 | |
95 | static void reap(int sig) |
96 | { |
410c8acf |
97 | int e = errno; |
06b2a088 |
98 | while (waitpid(-1, 0, WNOHANG) > 0) |
410c8acf |
99 | ; |
100 | errno = e; |
101 | } |
102 | |
103 | static void writelog(const char *cat, const char *msg) |
104 | { |
105 | char buf[256]; |
106 | time_t t = time(0); |
107 | struct tm *tm = localtime(&t); |
108 | strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm); |
109 | fprintf(logfp, "%s %s: %s\n", buf, cat, msg); |
110 | } |
111 | |
6be88c14 |
112 | static void cline(char *p, size_t len, void *b) |
410c8acf |
113 | { |
114 | char *q; |
115 | if (!p) { |
116 | if (f & f_command) |
117 | die(EXIT_FAILURE, "server dropped the connection"); |
118 | exit(0); |
119 | } |
120 | q = str_getword(&p); |
121 | if (!q) |
122 | return; |
123 | if (strcmp(q, "WARN") == 0) { |
124 | if (f & f_syslog) |
125 | syslog(LOG_WARNING, "%s", p); |
126 | if (logfp) |
127 | writelog("warning", p); |
128 | if (f & f_warn) |
129 | fprintf(stderr, "Warning: %s\n", p); |
130 | } else if (strcmp(q, "TRACE") == 0) { |
131 | if (f & f_syslog) |
132 | syslog(LOG_DEBUG, "%s", p); |
133 | if (logfp) |
134 | writelog("debug", p); |
135 | } else if (!(f & f_command)) { |
136 | if (f & f_syslog) |
137 | syslog(LOG_ERR, "unexpected output `%s %s'", q, p); |
138 | if (logfp) { |
139 | dstr d = DSTR_INIT; |
140 | dstr_putf(&d, "unexpected output `%s %s'", q, p); |
141 | writelog("error", d.buf); |
142 | dstr_destroy(&d); |
143 | } |
7fadfa0d |
144 | } else if (strcmp(q, "FAIL") == 0) |
410c8acf |
145 | die(EXIT_FAILURE, "%s", p); |
146 | else if (strcmp(q, "INFO") == 0) |
147 | puts(p); |
148 | else if (strcmp(q, "OK") == 0) |
149 | exit(0); |
150 | else |
151 | die(EXIT_FAILURE, "unexpected output `%s %s'", q, p); |
152 | } |
153 | |
6be88c14 |
154 | static void sline(char *p, size_t len, void *b) |
410c8acf |
155 | { |
156 | if (!p) { |
157 | if (!(f & f_uclose)) |
158 | moan("server closed the connection"); |
159 | exit(0); |
160 | } |
161 | puts(p); |
162 | } |
163 | |
6be88c14 |
164 | static void uline(char *p, size_t len, void *b) |
410c8acf |
165 | { |
410c8acf |
166 | if (!p) { |
167 | selbuf_destroy(b); |
168 | shutdown(fd, 1); |
169 | f |= f_uclose; |
170 | } else { |
6be88c14 |
171 | p[len] = '\n'; |
3cdc3f3a |
172 | errno = EIO; |
173 | if (write(fd, p, len + 1) != len + 1) |
174 | moan("write failed: %s", strerror(errno)); |
175 | } |
176 | } |
177 | |
178 | static void setup(const char *cmd) |
179 | { |
180 | dstr d = DSTR_INIT; |
181 | char ch; |
182 | char *p, *q; |
183 | int n; |
184 | |
185 | dstr_puts(&d, cmd); |
186 | dstr_putc(&d, '\n'); |
187 | errno = EIO; /* Relax: be vague */ |
188 | if (write(fd, d.buf, d.len) != d.len) { |
189 | die(EXIT_FAILURE, "error sending setup command `%s': %s", |
190 | cmd, strerror(errno)); |
191 | } |
192 | dstr_reset(&d); |
193 | for (;;) { |
194 | n = read(fd, &ch, 1); |
195 | if (!n) |
196 | die(EXIT_FAILURE, "unexpected EOF during setup"); |
197 | if (n < 0) { |
198 | die(EXIT_FAILURE, "error receiving reply to `%s': %s", |
199 | cmd, strerror(errno)); |
200 | } |
201 | if (d.len < 256) |
202 | dstr_putc(&d, ch); |
203 | if (ch == '\n') { |
204 | p = d.buf; |
205 | q = str_getword(&p); |
206 | if (!q) |
207 | ; |
208 | else if (strcmp(q, "OK") == 0) |
209 | return; |
210 | else if (strcmp(q, "FAIL") == 0) |
211 | die(EXIT_FAILURE, "setup command `%s' failed: %s", cmd, p); |
212 | dstr_reset(&d); |
213 | } |
410c8acf |
214 | } |
215 | } |
216 | |
9dd01bc6 |
217 | static void logfile(const char *name) |
218 | { |
fa4bef80 |
219 | FILE *fp; |
220 | |
221 | if ((fp = fopen(name, "a")) != 0) { |
222 | if (logfp) |
223 | fclose(logfp); |
224 | logfp = fp; |
225 | setvbuf(logfp, 0, _IOLBF, BUFSIZ); |
226 | } else { |
227 | dstr d = DSTR_INIT; |
228 | dstr_putf(&d, "error opening logfile `%s': %s", name, strerror(errno)); |
229 | if (logfp) |
230 | writelog("error", d.buf); |
231 | else if (logname) |
232 | die(EXIT_FAILURE, d.buf); |
233 | if (f & f_syslog) |
234 | syslog(LOG_ERR, d.buf); |
235 | dstr_destroy(&d); |
9dd01bc6 |
236 | } |
9dd01bc6 |
237 | } |
238 | |
5f5150b1 |
239 | static void sighup(int sig, void *v) |
240 | { |
241 | logfile(logname); |
242 | } |
243 | |
06b2a088 |
244 | static void cleanup(void) |
245 | { |
246 | if (pidfile) |
247 | unlink(pidfile); |
248 | } |
249 | |
250 | static void sigdie(int sig) |
251 | { |
252 | cleanup(); |
253 | signal(sig, SIG_DFL); |
254 | raise(sig); |
255 | } |
256 | |
410c8acf |
257 | static void version(FILE *fp) |
258 | { |
259 | pquis(fp, "$, TrIPE version " VERSION "\n"); |
260 | } |
261 | |
262 | static void usage(FILE *fp) |
263 | { |
264 | pquis(fp, "\ |
265 | Usage:\n\ |
2d752320 |
266 | $ [-w] [-OPTIONS] [COMMAND [ARGS]...]\n\ |
267 | $ [-Dl] [-f FILE] [-OPTIONS]\n\ |
410c8acf |
268 | Options:\n\ |
2d752320 |
269 | [-s] [-d DIRECTORY] [-a SOCKET] [-P PIDFILE]\n\ |
270 | [-p PROGRAM] [-S ARG,ARG,...]\n\ |
410c8acf |
271 | "); |
272 | } |
273 | |
274 | static void help(FILE *fp) |
275 | { |
276 | version(fp); |
277 | fputc('\n', fp); |
278 | usage(fp); |
279 | fputs("\ |
280 | \n\ |
281 | Options in full:\n\ |
282 | \n\ |
283 | -h, --help Show this help text.\n\ |
284 | -v, --version Show version number.\n\ |
285 | -u, --usage Show brief usage message.\n\ |
286 | \n\ |
287 | -D, --daemon Become a background task after connecting.\n\ |
ef4a1ab7 |
288 | -d, --directory=DIR Select current directory [default " CONFIGDIR "].\n\ |
3cdc3f3a |
289 | -a, --admin-socket=FILE Select socket to connect to\n\ |
ef4a1ab7 |
290 | [default " SOCKETDIR "/tripesock].\n\ |
06b2a088 |
291 | -P, --pidfile=FILE Write process-id to FILE.\n\ |
410c8acf |
292 | \n\ |
293 | -s, --spawn Start server rather than connecting.\n\ |
294 | -p, --spawn-path=PATH Specify path to executable.\n\ |
295 | -S, --spawn-args=ARGS Specify comma-separated arguments.\n\ |
296 | \n\ |
297 | -l, --syslog Log messages to system log.\n\ |
298 | -f, --logfile=FILE Log messages to FILE.\n\ |
299 | -w, --warnings Show warnings when running commands.\n\ |
300 | ", fp); |
301 | } |
302 | |
303 | int main(int argc, char *argv[]) |
304 | { |
ef4a1ab7 |
305 | const char *dir = CONFIGDIR; |
306 | const char *sock = SOCKETDIR "/tripesock"; |
410c8acf |
307 | const char *spawnpath = "tripe"; |
308 | string_v spawnopts = DA_INIT; |
309 | char *p; |
06b2a088 |
310 | FILE *pidfp = 0; |
410c8acf |
311 | |
312 | ego(argv[0]); |
313 | |
314 | if ((p = getenv("TRIPEDIR")) != 0) |
315 | dir = p; |
316 | |
317 | /* --- Parse the arguments --- */ |
318 | |
319 | for (;;) { |
320 | static const struct option opts[] = { |
321 | { "help", 0, 0, 'h' }, |
322 | { "version", 0, 0, 'v' }, |
323 | { "usage", 0, 0, 'u' }, |
324 | { "daemon", 0, 0, 'D' }, |
325 | { "directory", OPTF_ARGREQ, 0, 'd' }, |
326 | { "admin-socket", OPTF_ARGREQ, 0, 'a' }, |
327 | { "spawn", 0, 0, 's' }, |
328 | { "spawn-path", OPTF_ARGREQ, 0, 'p' }, |
329 | { "spawn-args", OPTF_ARGREQ, 0, 'S' }, |
330 | { "syslog", 0, 0, 'l' }, |
331 | { "logfile", OPTF_ARGREQ, 0, 'f' }, |
332 | { "warnings", 0, 0, 'w' }, |
06b2a088 |
333 | { "pidfile", OPTF_ARGREQ, 0, 'P' }, |
410c8acf |
334 | { 0, 0, 0, 0 } |
335 | }; |
336 | |
06b2a088 |
337 | int i = mdwopt(argc, argv, "+hvuDd:a:sp:S:lwf:nP:", opts, 0, 0, 0); |
410c8acf |
338 | if (i < 0) |
339 | break; |
340 | switch (i) { |
341 | case 'h': |
342 | help(stdout); |
343 | exit(0); |
344 | case 'v': |
345 | version(stdout); |
346 | exit(0); |
347 | case 'u': |
348 | usage(stdout); |
349 | exit(0); |
350 | case 'D': |
351 | f |= f_daemon | f_noinput; |
352 | break; |
353 | case 'd': |
354 | dir = optarg; |
355 | break; |
356 | case 'a': |
357 | sock = optarg; |
358 | break; |
359 | case 's': |
360 | f |= f_spawn; |
361 | break; |
362 | case 'p': |
363 | f |= f_spawn; |
364 | spawnpath = optarg; |
365 | break; |
366 | case 'S': |
367 | f |= f_spawn | f_spawnopts; |
368 | for (p = strtok(optarg, ","); p; p = strtok(0, ",")) |
369 | DA_PUSH(&spawnopts, p); |
370 | break; |
371 | case 'l': |
372 | f |= f_syslog | f_noinput; |
373 | break; |
374 | case 'w': |
375 | f |= f_warn; |
376 | break; |
377 | case 'f': |
9dd01bc6 |
378 | logname = optarg; |
410c8acf |
379 | f |= f_noinput; |
380 | break; |
06b2a088 |
381 | case 'P': |
382 | pidfile = optarg; |
383 | break; |
410c8acf |
384 | default: |
385 | f |= f_bogus; |
386 | break; |
387 | } |
388 | } |
389 | if ((f & f_bogus) || ((f & f_noinput) && optind < argc)) { |
390 | usage(stderr); |
391 | exit(EXIT_FAILURE); |
392 | } |
393 | |
06b2a088 |
394 | /* --- Set various things up --- */ |
395 | |
396 | if (chdir(dir)) { |
397 | die(EXIT_FAILURE, "couldn't set `%s' as current directory: %s", |
398 | dir, strerror(errno)); |
399 | } |
400 | if (logname) |
401 | logfile(logname); |
402 | if (!pidfile && (f & f_daemon) && ((f & f_syslog) || logname)) |
403 | pidfile = "tripectl.pid"; |
404 | if (pidfile && (pidfp = fopen(pidfile, "w")) == 0) { |
405 | die(EXIT_FAILURE, "couldn't open `%s' for writing: %s", |
406 | pidfile, strerror(errno)); |
407 | } |
408 | signal(SIGINT, sigdie); |
409 | signal(SIGQUIT, sigdie); |
410 | signal(SIGTERM, sigdie); |
411 | atexit(cleanup); |
412 | |
410c8acf |
413 | /* --- Connect to the server --- */ |
414 | |
415 | if (f & f_spawn) { |
416 | int pfd[2]; |
417 | pid_t kid; |
418 | struct sigaction sa; |
419 | sigset_t newmask, oldmask; |
420 | |
421 | sa.sa_handler = reap; |
422 | sigemptyset(&sa.sa_mask); |
423 | sa.sa_flags = SA_NOCLDSTOP; |
424 | #ifdef SA_RESTART |
425 | sa.sa_flags |= SA_RESTART; |
426 | #endif |
427 | sigaction(SIGCHLD, &sa, 0); |
428 | |
06b2a088 |
429 | DA_UNSHIFT(&spawnopts, (char *)sock); |
430 | DA_UNSHIFT(&spawnopts, "-a"); |
431 | DA_UNSHIFT(&spawnopts, "-d."); |
d071d798 |
432 | DA_UNSHIFT(&spawnopts, (char *)spawnpath); |
410c8acf |
433 | DA_PUSH(&spawnopts, 0); |
434 | if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd)) |
435 | die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno)); |
436 | sigemptyset(&newmask); |
437 | sigaddset(&newmask, SIGCHLD); |
438 | sigprocmask(SIG_BLOCK, &newmask, &oldmask); |
439 | if ((kid = fork()) < 0) |
440 | die(EXIT_FAILURE, "fork failed: %s", strerror(errno)); |
441 | if (!kid) { |
442 | dup2(pfd[1], STDIN_FILENO); |
443 | dup2(pfd[1], STDOUT_FILENO); |
444 | close(pfd[1]); |
445 | close(pfd[0]); |
9dd01bc6 |
446 | if (logfp) |
447 | fclose(logfp); |
7ed14135 |
448 | if (pidfp) |
449 | fclose(pidfp); |
9dd01bc6 |
450 | closelog(); |
06b2a088 |
451 | if (f & f_daemon) |
452 | u_detach(); |
410c8acf |
453 | execvp(DA(&spawnopts)[0], DA(&spawnopts)); |
454 | die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno)); |
455 | } |
456 | sigprocmask(SIG_SETMASK, &oldmask, 0); |
457 | fd = pfd[0]; |
458 | close(pfd[1]); |
459 | } else { |
460 | struct sockaddr_un sun; |
461 | size_t sz = strlen(sock) + 1; |
06b2a088 |
462 | if (sz > sizeof(sun.sun_path)) |
410c8acf |
463 | die(EXIT_FAILURE, "socket name `%s' too long", sock); |
464 | memset(&sun, 0, sizeof(sun)); |
465 | sun.sun_family = AF_UNIX; |
06b2a088 |
466 | memcpy(sun.sun_path, sock, sz); |
467 | sz = sz + offsetof(struct sockaddr_un, sun_path); |
410c8acf |
468 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
469 | die(EXIT_FAILURE, "error making socket: %s", strerror(errno)); |
470 | if (connect(fd, (struct sockaddr *)&sun, sz)) { |
471 | die(EXIT_FAILURE, "error connecting to `%s': %s", |
9dd01bc6 |
472 | sun.sun_path, strerror(errno)); |
410c8acf |
473 | } |
474 | } |
475 | |
476 | if (f & f_daemon) { |
477 | if (u_daemon()) |
478 | die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno)); |
479 | } |
06b2a088 |
480 | if (pidfp) { |
a803add7 |
481 | fprintf(pidfp, "%li\n", (long)getpid()); |
06b2a088 |
482 | fclose(pidfp); |
483 | } |
3cdc3f3a |
484 | signal(SIGPIPE, SIG_IGN); |
410c8acf |
485 | |
486 | /* --- If we're meant to be interactive, do that --- */ |
487 | |
3cdc3f3a |
488 | if (optind == argc) |
489 | setup("WATCH -A+tw"); |
410c8acf |
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; |
3cdc3f3a |
507 | setup((f & f_warn) ? "WATCH -A+w" : "WATCH -A"); |
410c8acf |
508 | dstr_puts(&d, argv[optind++]); |
509 | while (optind < argc) { |
510 | dstr_putc(&d, ' '); |
511 | dstr_puts(&d, argv[optind++]); |
512 | } |
513 | dstr_putc(&d, '\n'); |
3cdc3f3a |
514 | errno = EIO; |
515 | if (write(fd, d.buf, d.len) != d.len || shutdown(fd, 1)) |
516 | die(EXIT_FAILURE, "write failed: %s", strerror(errno)); |
410c8acf |
517 | dstr_destroy(&d); |
518 | f |= f_command; |
519 | } |
520 | |
521 | /* --- Pull everything else out of the box --- */ |
522 | |
523 | { |
5f5150b1 |
524 | sel_state sel; |
525 | selbuf b; |
526 | sig hup; |
527 | |
528 | sel_init(&sel); |
529 | selbuf_init(&b, &sel, fd, cline, 0); |
530 | |
410c8acf |
531 | if (f & f_syslog) |
532 | openlog(QUIS, 0, LOG_DAEMON); |
9dd01bc6 |
533 | if (logfp) { |
5f5150b1 |
534 | sig_init(&sel); |
535 | sig_add(&hup, SIGHUP, sighup, 0); |
9dd01bc6 |
536 | } |
410c8acf |
537 | for (;;) { |
5f5150b1 |
538 | if (sel_select(&sel) && errno != EINTR && errno != EAGAIN) |
539 | die(EXIT_FAILURE, "select failed: %s", strerror(errno)); |
410c8acf |
540 | } |
410c8acf |
541 | } |
542 | |
543 | return (0); |
544 | } |
545 | |
546 | /*----- That's all, folks -------------------------------------------------*/ |