5 * (c) 2001 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Trivial IP Encryption (TrIPE).
12 * TrIPE is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * TrIPE is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with TrIPE; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 /*----- Header files ------------------------------------------------------*/
39 #include <sys/types.h>
46 #include <sys/socket.h>
48 #include <arpa/inet.h>
51 #include <mLib/alloc.h>
52 #include <mLib/daemonize.h>
53 #include <mLib/darray.h>
54 #include <mLib/dstr.h>
55 #include <mLib/mdwopt.h>
56 #include <mLib/quis.h>
57 #include <mLib/report.h>
59 #include <mLib/selbuf.h>
62 #include <mLib/versioncmp.h>
68 /*----- Data structures ---------------------------------------------------*/
72 DA_DECL(string_v, char *);
75 /*----- Static variables --------------------------------------------------*/
78 static const char *pidfile = 0;
79 static const char *logname = 0;
80 static FILE *logfp = 0;
81 static unsigned f = 0;
83 static const char *bgtag = 0;
88 #define f_spawnopts 8u
95 /*----- Main code ---------------------------------------------------------*/
97 static void reap(int sig)
100 while (waitpid(-1, 0, WNOHANG) > 0)
105 static void writelog(const char *cat, const char *msg)
109 struct tm *tm = localtime(&t);
110 strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm);
111 fprintf(logfp, "%s %s: %s\n", buf, cat, msg);
114 static void checkbg(char **p)
116 char *q = str_getword(p);
118 die(EXIT_FAILURE, "missing background tag");
119 if (!bgtag || strcmp(bgtag, q) != 0)
120 die(EXIT_FAILURE, "unexpected background tag `%s'", q);
123 static void checkfg(void)
124 { if (bgtag) die(EXIT_FAILURE, "unexpected foreground response"); }
126 static void cline(char *p, size_t len, void *b)
131 die(EXIT_FAILURE, "server dropped the connection");
137 if (strcmp(q, "WARN") == 0) {
139 syslog(LOG_WARNING, "%s", p);
141 writelog("warning", p);
143 fprintf(stderr, "Warning: %s\n", p);
144 } else if (strcmp(q, "TRACE") == 0) {
146 syslog(LOG_DEBUG, "%s", p);
148 writelog("debug", p);
149 } else if (!(f & f_command)) {
151 syslog(LOG_ERR, "unexpected output `%s %s'", q, p);
154 dstr_putf(&d, "unexpected output `%s %s'", q, p);
155 writelog("error", d.buf);
158 } else if (strcmp(q, "FAIL") == 0) {
160 die(EXIT_FAILURE, "%s", p);
161 } else if (strcmp(q, "INFO") == 0) {
165 } else if (strcmp(q, "OK") == 0) {
168 } else if (strcmp(q, "BGDETACH") == 0) {
170 die(EXIT_FAILURE, "repeat detach");
172 } else if (strcmp(q, "BGOK") == 0) {
175 } else if (strcmp(q, "BGINFO") == 0) {
179 } else if (strcmp(q, "BGFAIL") == 0) {
181 die(EXIT_FAILURE, "%s", p);
183 die(EXIT_FAILURE, "unexpected output `%s %s'", q, p);
186 static void sline(char *p, size_t len, void *b)
190 moan("server closed the connection");
197 static void uline(char *p, size_t len, void *b)
206 if (write(fd, p, len + 1) != len + 1)
207 moan("write failed: %s", strerror(errno));
211 static void setup(const char *cmd)
220 errno = EIO; /* Relax: be vague */
221 if (write(fd, d.buf, d.len) != d.len) {
222 die(EXIT_FAILURE, "error sending setup command `%s': %s",
223 cmd, strerror(errno));
227 n = read(fd, &ch, 1);
229 die(EXIT_FAILURE, "unexpected EOF during setup");
231 die(EXIT_FAILURE, "error receiving reply to `%s': %s",
232 cmd, strerror(errno));
241 else if (strcmp(q, "OK") == 0)
243 else if (strcmp(q, "FAIL") == 0)
244 die(EXIT_FAILURE, "setup command `%s' failed: %s", cmd, p);
250 static void logfile(const char *name)
254 if ((fp = fopen(name, "a")) != 0) {
258 setvbuf(logfp, 0, _IOLBF, BUFSIZ);
261 dstr_putf(&d, "error opening logfile `%s': %s", name, strerror(errno));
263 writelog("error", d.buf);
265 die(EXIT_FAILURE, d.buf);
267 syslog(LOG_ERR, d.buf);
272 static void sighup(int sig, void *v) { logfile(logname); }
274 static void cleanup(void) { if (pidfile) unlink(pidfile); }
276 static void sigdie(int sig)
277 { cleanup(); signal(sig, SIG_DFL); raise(sig); }
279 static void putarg(string_v *av, const char *fmt, ...)
285 dstr_vputf(&d, fmt, &ap);
288 DA_UNSHIFT(av, xstrdup(d.buf));
292 static void version(FILE *fp)
293 { pquis(fp, "$, TrIPE version " VERSION "\n"); }
295 static void usage(FILE *fp)
299 $ [-w] [-OPTIONS] [COMMAND [ARGS]...]\n\
300 $ [-Dl] [-f FILE] [-OPTIONS]\n\
302 [-s] [-d DIRECTORY] [-a SOCKET] [-P PIDFILE]\n\
303 [-p PROGRAM] [-S ARG,ARG,...]\n\
307 static void help(FILE *fp)
316 -h, --help Show this help text.\n\
317 -v, --version Show version number.\n\
318 -u, --usage Show brief usage message.\n\
320 -D, --daemon Become a background task after connecting.\n\
321 -d, --directory=DIR Select current directory [default " CONFIGDIR "].\n\
322 -U, --setuid=USER Set uid to USER after initialization.\n\
323 -G, --setgid=GROUP Set gid to GROUP after initialization.\n\
324 -a, --admin-socket=FILE Select socket to connect to\n\
325 [default " SOCKETDIR "/tripesock].\n\
326 -P, --pidfile=FILE Write process-id to FILE.\n\
328 -s, --spawn Start server rather than connecting.\n\
329 -p, --spawn-path=PATH Specify path to executable.\n\
330 -S, --spawn-args=ARGS Specify comma-separated arguments.\n\
332 -l, --syslog Log messages to system log.\n\
333 -f, --logfile=FILE Log messages to FILE.\n\
334 -w, --warnings Show warnings when running commands.\n\
338 int main(int argc, char *argv[])
340 const char *dir = CONFIGDIR;
341 const char *sock = SOCKETDIR "/tripesock";
342 const char *spawnpath = "tripe";
343 string_v spawnopts = DA_INIT;
353 sigset_t newmask, oldmask;
354 struct sockaddr_un sun;
361 if ((p = getenv("TRIPEDIR")) != 0)
363 if ((p = getenv("TRIPESOCK")) != 0)
366 /* --- Parse the arguments --- */
369 static const struct option opts[] = {
370 { "help", 0, 0, 'h' },
371 { "version", 0, 0, 'v' },
372 { "usage", 0, 0, 'u' },
373 { "daemon", 0, 0, 'D' },
374 { "uid", OPTF_ARGREQ, 0, 'U' },
375 { "setuid", OPTF_ARGREQ, 0, 'U' },
376 { "gid", OPTF_ARGREQ, 0, 'G' },
377 { "setgid", OPTF_ARGREQ, 0, 'G' },
378 { "directory", OPTF_ARGREQ, 0, 'd' },
379 { "admin-socket", OPTF_ARGREQ, 0, 'a' },
380 { "spawn", 0, 0, 's' },
381 { "spawn-path", OPTF_ARGREQ, 0, 'p' },
382 { "spawn-args", OPTF_ARGREQ, 0, 'S' },
383 { "syslog", 0, 0, 'l' },
384 { "logfile", OPTF_ARGREQ, 0, 'f' },
385 { "warnings", 0, 0, 'w' },
386 { "pidfile", OPTF_ARGREQ, 0, 'P' },
390 i = mdwopt(argc, argv, "+hvuDU:G:d:a:sp:S:lwf:nP:", opts, 0, 0, 0);
404 f |= f_daemon | f_noinput;
407 u = u_getuser(optarg, &g);
410 g = u_getgroup(optarg);
426 f |= f_spawn | f_spawnopts;
427 for (p = strtok(optarg, ","); p; p = strtok(0, ","))
428 DA_PUSH(&spawnopts, p);
431 f |= f_syslog | f_noinput;
448 if ((f & f_bogus) || ((f & f_noinput) && optind < argc)) {
453 /* --- Set various things up --- */
456 die(EXIT_FAILURE, "couldn't set `%s' as current directory: %s",
457 dir, strerror(errno));
461 if (!pidfile && (f & f_daemon) && ((f & f_syslog) || logname))
462 pidfile = "tripectl.pid";
463 if (pidfile && (pidfp = fopen(pidfile, "w")) == 0) {
464 die(EXIT_FAILURE, "couldn't open `%s' for writing: %s",
465 pidfile, strerror(errno));
469 signal(SIGINT, sigdie);
470 signal(SIGQUIT, sigdie);
471 signal(SIGTERM, sigdie);
474 /* --- Connect to the server --- */
477 sa.sa_handler = reap;
478 sigemptyset(&sa.sa_mask);
479 sa.sa_flags = SA_NOCLDSTOP;
481 sa.sa_flags |= SA_RESTART;
483 sigaction(SIGCHLD, &sa, 0);
485 DA_PUSH(&spawnopts, 0);
486 if (g != (gid_t)-1) putarg(&spawnopts, "-G%lu", (unsigned long)g);
487 if (u != (uid_t)-1) putarg(&spawnopts, "-U%lu", (unsigned long)u);
488 putarg(&spawnopts, "-a%s", sock);
489 putarg(&spawnopts, "-d.");
490 putarg(&spawnopts, "-F");
491 putarg(&spawnopts, "%s", spawnpath);
492 if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd))
493 die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno));
494 sigemptyset(&newmask);
495 sigaddset(&newmask, SIGCHLD);
496 sigprocmask(SIG_BLOCK, &newmask, &oldmask);
497 if ((kid = fork()) < 0)
498 die(EXIT_FAILURE, "fork failed: %s", strerror(errno));
500 dup2(pfd[1], STDIN_FILENO);
501 dup2(pfd[1], STDOUT_FILENO);
504 if (logfp) fclose(logfp);
505 if (pidfp) fclose(pidfp);
507 if (f & f_daemon) detachtty();
508 execvp(DA(&spawnopts)[0], DA(&spawnopts));
509 die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno));
511 sigprocmask(SIG_SETMASK, &oldmask, 0);
515 sz = strlen(sock) + 1;
516 if (sz > sizeof(sun.sun_path))
517 die(EXIT_FAILURE, "socket name `%s' too long", sock);
518 memset(&sun, 0, sizeof(sun));
519 sun.sun_family = AF_UNIX;
520 memcpy(sun.sun_path, sock, sz);
521 sz = sz + offsetof(struct sockaddr_un, sun_path);
522 if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
523 die(EXIT_FAILURE, "error making socket: %s", strerror(errno));
524 if (connect(fd, (struct sockaddr *)&sun, sz)) {
525 die(EXIT_FAILURE, "error connecting to `%s': %s",
526 sun.sun_path, strerror(errno));
533 die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno));
536 fprintf(pidfp, "%li\n", (long)getpid());
539 signal(SIGPIPE, SIG_IGN);
541 /* --- If we're meant to be interactive, do that --- */
544 setup("WATCH -A+tw");
545 if (!(f & f_noinput) && optind == argc) {
546 selbuf_init(&bu, &sel, STDIN_FILENO, uline, &bu);
547 selbuf_init(&bs, &sel, fd, sline, &bs);
549 if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
550 die(EXIT_FAILURE, "select failed: %s", strerror(errno));
554 /* --- If there's a command, submit it --- */
557 setup((f & f_warn) ? "WATCH -A+w" : "WATCH -A");
558 while (optind < argc)
559 u_quotify(&d, argv[optind++]);
562 if (write(fd, d.buf, d.len) != d.len || shutdown(fd, 1))
563 die(EXIT_FAILURE, "write failed: %s", strerror(errno));
568 /* --- Pull everything else out of the box --- */
570 selbuf_init(&bs, &sel, fd, cline, 0);
573 openlog(QUIS, 0, LOG_DAEMON);
575 sig_add(&hup, SIGHUP, sighup, 0);
577 if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
578 die(EXIT_FAILURE, "select failed: %s", strerror(errno));
584 /*----- That's all, folks -------------------------------------------------*/