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