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[tripe] / client.c
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410c8acf 1/* -*-c-*-
2 *
b4e56668 3 * $Id: client.c,v 1.14 2004/04/08 01:36:17 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
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 77static const char *pidfile = 0;
78static const char *logname = 0;
410c8acf 79static FILE *logfp = 0;
80static unsigned f = 0;
81static 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
95static 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
103static 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 112static 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 154static 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 164static 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';
172 write(fd, p, len + 1);
410c8acf 173 }
174}
175
9dd01bc6 176static void logfile(const char *name)
177{
fa4bef80 178 FILE *fp;
179
180 if ((fp = fopen(name, "a")) != 0) {
181 if (logfp)
182 fclose(logfp);
183 logfp = fp;
184 setvbuf(logfp, 0, _IOLBF, BUFSIZ);
185 } else {
186 dstr d = DSTR_INIT;
187 dstr_putf(&d, "error opening logfile `%s': %s", name, strerror(errno));
188 if (logfp)
189 writelog("error", d.buf);
190 else if (logname)
191 die(EXIT_FAILURE, d.buf);
192 if (f & f_syslog)
193 syslog(LOG_ERR, d.buf);
194 dstr_destroy(&d);
9dd01bc6 195 }
9dd01bc6 196}
197
5f5150b1 198static void sighup(int sig, void *v)
199{
200 logfile(logname);
201}
202
06b2a088 203static void cleanup(void)
204{
205 if (pidfile)
206 unlink(pidfile);
207}
208
209static void sigdie(int sig)
210{
211 cleanup();
212 signal(sig, SIG_DFL);
213 raise(sig);
214}
215
410c8acf 216static void version(FILE *fp)
217{
218 pquis(fp, "$, TrIPE version " VERSION "\n");
219}
220
221static void usage(FILE *fp)
222{
223 pquis(fp, "\
224Usage:\n\
225 $ [-w] [-options] [command [args]...]\n\
226 $ [-Dl] [-f file] [-options]\n\
227Options:\n\
06b2a088 228 [-s] [-d directory] [-a socket] [-P pidfile]\n\
229 [-p program] [-S arg,arg,...]\n\
410c8acf 230");
231}
232
233static void help(FILE *fp)
234{
235 version(fp);
236 fputc('\n', fp);
237 usage(fp);
238 fputs("\
239\n\
240Options in full:\n\
241\n\
242-h, --help Show this help text.\n\
243-v, --version Show version number.\n\
244-u, --usage Show brief usage message.\n\
245\n\
246-D, --daemon Become a background task after connecting.\n\
ef4a1ab7 247-d, --directory=DIR Select current directory [default " CONFIGDIR "].\n\
248-a, --admin-socket=FILE Select socket to connect to
249 [default " SOCKETDIR "/tripesock].\n\
06b2a088 250-P, --pidfile=FILE Write process-id to FILE.\n\
410c8acf 251\n\
252-s, --spawn Start server rather than connecting.\n\
253-p, --spawn-path=PATH Specify path to executable.\n\
254-S, --spawn-args=ARGS Specify comma-separated arguments.\n\
255\n\
256-l, --syslog Log messages to system log.\n\
257-f, --logfile=FILE Log messages to FILE.\n\
258-w, --warnings Show warnings when running commands.\n\
259", fp);
260}
261
262int main(int argc, char *argv[])
263{
ef4a1ab7 264 const char *dir = CONFIGDIR;
265 const char *sock = SOCKETDIR "/tripesock";
410c8acf 266 const char *spawnpath = "tripe";
267 string_v spawnopts = DA_INIT;
268 char *p;
06b2a088 269 FILE *pidfp = 0;
410c8acf 270
271 ego(argv[0]);
272
273 if ((p = getenv("TRIPEDIR")) != 0)
274 dir = p;
275
276 /* --- Parse the arguments --- */
277
278 for (;;) {
279 static const struct option opts[] = {
280 { "help", 0, 0, 'h' },
281 { "version", 0, 0, 'v' },
282 { "usage", 0, 0, 'u' },
283 { "daemon", 0, 0, 'D' },
284 { "directory", OPTF_ARGREQ, 0, 'd' },
285 { "admin-socket", OPTF_ARGREQ, 0, 'a' },
286 { "spawn", 0, 0, 's' },
287 { "spawn-path", OPTF_ARGREQ, 0, 'p' },
288 { "spawn-args", OPTF_ARGREQ, 0, 'S' },
289 { "syslog", 0, 0, 'l' },
290 { "logfile", OPTF_ARGREQ, 0, 'f' },
291 { "warnings", 0, 0, 'w' },
06b2a088 292 { "pidfile", OPTF_ARGREQ, 0, 'P' },
410c8acf 293 { 0, 0, 0, 0 }
294 };
295
06b2a088 296 int i = mdwopt(argc, argv, "+hvuDd:a:sp:S:lwf:nP:", opts, 0, 0, 0);
410c8acf 297 if (i < 0)
298 break;
299 switch (i) {
300 case 'h':
301 help(stdout);
302 exit(0);
303 case 'v':
304 version(stdout);
305 exit(0);
306 case 'u':
307 usage(stdout);
308 exit(0);
309 case 'D':
310 f |= f_daemon | f_noinput;
311 break;
312 case 'd':
313 dir = optarg;
314 break;
315 case 'a':
316 sock = optarg;
317 break;
318 case 's':
319 f |= f_spawn;
320 break;
321 case 'p':
322 f |= f_spawn;
323 spawnpath = optarg;
324 break;
325 case 'S':
326 f |= f_spawn | f_spawnopts;
327 for (p = strtok(optarg, ","); p; p = strtok(0, ","))
328 DA_PUSH(&spawnopts, p);
329 break;
330 case 'l':
331 f |= f_syslog | f_noinput;
332 break;
333 case 'w':
334 f |= f_warn;
335 break;
336 case 'f':
9dd01bc6 337 logname = optarg;
410c8acf 338 f |= f_noinput;
339 break;
06b2a088 340 case 'P':
341 pidfile = optarg;
342 break;
410c8acf 343 default:
344 f |= f_bogus;
345 break;
346 }
347 }
348 if ((f & f_bogus) || ((f & f_noinput) && optind < argc)) {
349 usage(stderr);
350 exit(EXIT_FAILURE);
351 }
352
06b2a088 353 /* --- Set various things up --- */
354
355 if (chdir(dir)) {
356 die(EXIT_FAILURE, "couldn't set `%s' as current directory: %s",
357 dir, strerror(errno));
358 }
359 if (logname)
360 logfile(logname);
361 if (!pidfile && (f & f_daemon) && ((f & f_syslog) || logname))
362 pidfile = "tripectl.pid";
363 if (pidfile && (pidfp = fopen(pidfile, "w")) == 0) {
364 die(EXIT_FAILURE, "couldn't open `%s' for writing: %s",
365 pidfile, strerror(errno));
366 }
367 signal(SIGINT, sigdie);
368 signal(SIGQUIT, sigdie);
369 signal(SIGTERM, sigdie);
370 atexit(cleanup);
371
410c8acf 372 /* --- Connect to the server --- */
373
374 if (f & f_spawn) {
375 int pfd[2];
376 pid_t kid;
377 struct sigaction sa;
378 sigset_t newmask, oldmask;
379
380 sa.sa_handler = reap;
381 sigemptyset(&sa.sa_mask);
382 sa.sa_flags = SA_NOCLDSTOP;
383#ifdef SA_RESTART
384 sa.sa_flags |= SA_RESTART;
385#endif
386 sigaction(SIGCHLD, &sa, 0);
387
06b2a088 388 DA_UNSHIFT(&spawnopts, (char *)sock);
389 DA_UNSHIFT(&spawnopts, "-a");
390 DA_UNSHIFT(&spawnopts, "-d.");
d071d798 391 DA_UNSHIFT(&spawnopts, (char *)spawnpath);
410c8acf 392 DA_PUSH(&spawnopts, 0);
393 if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd))
394 die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno));
395 sigemptyset(&newmask);
396 sigaddset(&newmask, SIGCHLD);
397 sigprocmask(SIG_BLOCK, &newmask, &oldmask);
398 if ((kid = fork()) < 0)
399 die(EXIT_FAILURE, "fork failed: %s", strerror(errno));
400 if (!kid) {
401 dup2(pfd[1], STDIN_FILENO);
402 dup2(pfd[1], STDOUT_FILENO);
403 close(pfd[1]);
404 close(pfd[0]);
9dd01bc6 405 if (logfp)
406 fclose(logfp);
7ed14135 407 if (pidfp)
408 fclose(pidfp);
9dd01bc6 409 closelog();
06b2a088 410 if (f & f_daemon)
411 u_detach();
410c8acf 412 execvp(DA(&spawnopts)[0], DA(&spawnopts));
413 die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno));
414 }
415 sigprocmask(SIG_SETMASK, &oldmask, 0);
416 fd = pfd[0];
417 close(pfd[1]);
418 } else {
419 struct sockaddr_un sun;
420 size_t sz = strlen(sock) + 1;
06b2a088 421 if (sz > sizeof(sun.sun_path))
410c8acf 422 die(EXIT_FAILURE, "socket name `%s' too long", sock);
423 memset(&sun, 0, sizeof(sun));
424 sun.sun_family = AF_UNIX;
06b2a088 425 memcpy(sun.sun_path, sock, sz);
426 sz = sz + offsetof(struct sockaddr_un, sun_path);
410c8acf 427 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
428 die(EXIT_FAILURE, "error making socket: %s", strerror(errno));
429 if (connect(fd, (struct sockaddr *)&sun, sz)) {
430 die(EXIT_FAILURE, "error connecting to `%s': %s",
9dd01bc6 431 sun.sun_path, strerror(errno));
410c8acf 432 }
433 }
434
435 if (f & f_daemon) {
436 if (u_daemon())
437 die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno));
438 }
06b2a088 439 if (pidfp) {
a803add7 440 fprintf(pidfp, "%li\n", (long)getpid());
06b2a088 441 fclose(pidfp);
442 }
410c8acf 443
444 /* --- If we're meant to be interactive, do that --- */
445
446 if (!(f & f_noinput) && optind == argc) {
447 sel_state sel;
448 selbuf bu, bs;
449
450 sel_init(&sel);
451 selbuf_init(&bu, &sel, STDIN_FILENO, uline, &bu);
452 selbuf_init(&bs, &sel, fd, sline, &bs);
453 for (;;) {
5f5150b1 454 if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
410c8acf 455 die(EXIT_FAILURE, "select failed: %s", strerror(errno));
456 }
457 }
458
459 /* --- If there's a command, submit it --- */
460
461 if (optind < argc) {
462 dstr d = DSTR_INIT;
463 dstr_puts(&d, argv[optind++]);
464 while (optind < argc) {
465 dstr_putc(&d, ' ');
466 dstr_puts(&d, argv[optind++]);
467 }
468 dstr_putc(&d, '\n');
469 write(fd, d.buf, d.len);
470 shutdown(fd, 1);
471 dstr_destroy(&d);
472 f |= f_command;
473 }
474
475 /* --- Pull everything else out of the box --- */
476
477 {
5f5150b1 478 sel_state sel;
479 selbuf b;
480 sig hup;
481
482 sel_init(&sel);
483 selbuf_init(&b, &sel, fd, cline, 0);
484
410c8acf 485 if (f & f_syslog)
486 openlog(QUIS, 0, LOG_DAEMON);
9dd01bc6 487 if (logfp) {
5f5150b1 488 sig_init(&sel);
489 sig_add(&hup, SIGHUP, sighup, 0);
9dd01bc6 490 }
410c8acf 491 for (;;) {
5f5150b1 492 if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
493 die(EXIT_FAILURE, "select failed: %s", strerror(errno));
410c8acf 494 }
410c8acf 495 }
496
497 return (0);
498}
499
500/*----- That's all, folks -------------------------------------------------*/