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