chiark / gitweb /
More documentation.
[tripe] / client.c
CommitLineData
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
98static FILE *logfp = 0;
99static unsigned f = 0;
5f5150b1 100static const char *logname = 0;
410c8acf 101static 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
115static 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
124static 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
133static 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
175static 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
185static 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
9dd01bc6 199static 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 210static void sighup(int sig, void *v)
211{
212 logfile(logname);
213}
214
410c8acf 215static void version(FILE *fp)
216{
217 pquis(fp, "$, TrIPE version " VERSION "\n");
218}
219
220static void usage(FILE *fp)
221{
222 pquis(fp, "\
223Usage:\n\
224 $ [-w] [-options] [command [args]...]\n\
225 $ [-Dl] [-f file] [-options]\n\
226Options:\n\
227 [-s] [-d directory] [-a socket] [-p program] [-S arg,arg,...]\n\
228");
229}
230
231static void help(FILE *fp)
232{
233 version(fp);
234 fputc('\n', fp);
235 usage(fp);
236 fputs("\
237\n\
238Options 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
258int 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 -------------------------------------------------*/