| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: client.c,v 1.7 2001/02/22 09:07:54 mdw Exp $ |
| 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 $ |
| 32 | * Revision 1.7 2001/02/22 09:07:54 mdw |
| 33 | * Write a pidfile on request, and delete it when finished. |
| 34 | * |
| 35 | * Revision 1.6 2001/02/22 09:06:08 mdw |
| 36 | * Fix logfile rotation to avoid program collapse. |
| 37 | * |
| 38 | * Revision 1.5 2001/02/16 21:23:39 mdw |
| 39 | * Use reliable signal handling for reopening logs. |
| 40 | * |
| 41 | * Revision 1.4 2001/02/06 09:34:53 mdw |
| 42 | * Change ERR response to FAIL for consistency with other programs. |
| 43 | * |
| 44 | * Revision 1.3 2001/02/04 17:10:15 mdw |
| 45 | * Reopen logfiles on receipt of @SIGHUP@ (not done very well). Don't |
| 46 | * change directory -- just mangle pathnames instead. |
| 47 | * |
| 48 | * Revision 1.2 2001/02/04 01:17:54 mdw |
| 49 | * Create a configuration header file to tidy up command lines. |
| 50 | * |
| 51 | * Revision 1.1 2001/02/03 20:26:37 mdw |
| 52 | * Initial checkin. |
| 53 | * |
| 54 | */ |
| 55 | |
| 56 | /*----- Header files ------------------------------------------------------*/ |
| 57 | |
| 58 | #include "config.h" |
| 59 | |
| 60 | #include <ctype.h> |
| 61 | #include <errno.h> |
| 62 | #include <signal.h> |
| 63 | #include <stdio.h> |
| 64 | #include <stdlib.h> |
| 65 | #include <string.h> |
| 66 | #include <time.h> |
| 67 | |
| 68 | #include <sys/types.h> |
| 69 | #include <sys/time.h> |
| 70 | #include <unistd.h> |
| 71 | #include <fcntl.h> |
| 72 | #include <sys/wait.h> |
| 73 | #include <syslog.h> |
| 74 | |
| 75 | #include <sys/socket.h> |
| 76 | #include <sys/un.h> |
| 77 | #include <arpa/inet.h> |
| 78 | #include <netdb.h> |
| 79 | |
| 80 | #include <mLib/alloc.h> |
| 81 | #include <mLib/darray.h> |
| 82 | #include <mLib/dstr.h> |
| 83 | #include <mLib/mdwopt.h> |
| 84 | #include <mLib/quis.h> |
| 85 | #include <mLib/report.h> |
| 86 | #include <mLib/sel.h> |
| 87 | #include <mLib/selbuf.h> |
| 88 | #include <mLib/sig.h> |
| 89 | #include <mLib/str.h> |
| 90 | |
| 91 | #include "util.h" |
| 92 | |
| 93 | #undef sun |
| 94 | |
| 95 | /*----- Data structures ---------------------------------------------------*/ |
| 96 | |
| 97 | #ifndef STRING_V |
| 98 | # define STRING_V |
| 99 | DA_DECL(string_v, char *); |
| 100 | #endif |
| 101 | |
| 102 | /*----- Static variables --------------------------------------------------*/ |
| 103 | |
| 104 | static const char *pidfile = 0; |
| 105 | static const char *logname = 0; |
| 106 | static FILE *logfp = 0; |
| 107 | static unsigned f = 0; |
| 108 | static int fd; |
| 109 | |
| 110 | #define f_bogus 1u |
| 111 | #define f_spawn 2u |
| 112 | #define f_daemon 4u |
| 113 | #define f_spawnopts 8u |
| 114 | #define f_syslog 16u |
| 115 | #define f_command 32u |
| 116 | #define f_noinput 64u |
| 117 | #define f_warn 128u |
| 118 | #define f_uclose 256u |
| 119 | |
| 120 | /*----- Main code ---------------------------------------------------------*/ |
| 121 | |
| 122 | static void reap(int sig) |
| 123 | { |
| 124 | int e = errno; |
| 125 | while (waitpid(-1, 0, WNOHANG) > 0) |
| 126 | ; |
| 127 | errno = e; |
| 128 | } |
| 129 | |
| 130 | static void writelog(const char *cat, const char *msg) |
| 131 | { |
| 132 | char buf[256]; |
| 133 | time_t t = time(0); |
| 134 | struct tm *tm = localtime(&t); |
| 135 | strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm); |
| 136 | fprintf(logfp, "%s %s: %s\n", buf, cat, msg); |
| 137 | } |
| 138 | |
| 139 | static void cline(char *p, void *b) |
| 140 | { |
| 141 | char *q; |
| 142 | if (!p) { |
| 143 | if (f & f_command) |
| 144 | die(EXIT_FAILURE, "server dropped the connection"); |
| 145 | exit(0); |
| 146 | } |
| 147 | q = str_getword(&p); |
| 148 | if (!q) |
| 149 | return; |
| 150 | if (strcmp(q, "WARN") == 0) { |
| 151 | if (f & f_syslog) |
| 152 | syslog(LOG_WARNING, "%s", p); |
| 153 | if (logfp) |
| 154 | writelog("warning", p); |
| 155 | if (f & f_warn) |
| 156 | fprintf(stderr, "Warning: %s\n", p); |
| 157 | } else if (strcmp(q, "TRACE") == 0) { |
| 158 | if (f & f_syslog) |
| 159 | syslog(LOG_DEBUG, "%s", p); |
| 160 | if (logfp) |
| 161 | writelog("debug", p); |
| 162 | } else if (!(f & f_command)) { |
| 163 | if (f & f_syslog) |
| 164 | syslog(LOG_ERR, "unexpected output `%s %s'", q, p); |
| 165 | if (logfp) { |
| 166 | dstr d = DSTR_INIT; |
| 167 | dstr_putf(&d, "unexpected output `%s %s'", q, p); |
| 168 | writelog("error", d.buf); |
| 169 | dstr_destroy(&d); |
| 170 | } |
| 171 | } else if (strcmp(q, "FAIL") == 0) |
| 172 | die(EXIT_FAILURE, "%s", p); |
| 173 | else if (strcmp(q, "INFO") == 0) |
| 174 | puts(p); |
| 175 | else if (strcmp(q, "OK") == 0) |
| 176 | exit(0); |
| 177 | else |
| 178 | die(EXIT_FAILURE, "unexpected output `%s %s'", q, p); |
| 179 | } |
| 180 | |
| 181 | static void sline(char *p, void *b) |
| 182 | { |
| 183 | if (!p) { |
| 184 | if (!(f & f_uclose)) |
| 185 | moan("server closed the connection"); |
| 186 | exit(0); |
| 187 | } |
| 188 | puts(p); |
| 189 | } |
| 190 | |
| 191 | static void uline(char *p, void *b) |
| 192 | { |
| 193 | size_t sz; |
| 194 | if (!p) { |
| 195 | selbuf_destroy(b); |
| 196 | shutdown(fd, 1); |
| 197 | f |= f_uclose; |
| 198 | } else { |
| 199 | sz = strlen(p); |
| 200 | p[sz] = '\n'; |
| 201 | write(fd, p, sz + 1); |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | static void logfile(const char *name) |
| 206 | { |
| 207 | FILE *fp; |
| 208 | |
| 209 | if ((fp = fopen(name, "a")) != 0) { |
| 210 | if (logfp) |
| 211 | fclose(logfp); |
| 212 | logfp = fp; |
| 213 | setvbuf(logfp, 0, _IOLBF, BUFSIZ); |
| 214 | } else { |
| 215 | dstr d = DSTR_INIT; |
| 216 | dstr_putf(&d, "error opening logfile `%s': %s", name, strerror(errno)); |
| 217 | if (logfp) |
| 218 | writelog("error", d.buf); |
| 219 | else if (logname) |
| 220 | die(EXIT_FAILURE, d.buf); |
| 221 | if (f & f_syslog) |
| 222 | syslog(LOG_ERR, d.buf); |
| 223 | dstr_destroy(&d); |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | static void sighup(int sig, void *v) |
| 228 | { |
| 229 | logfile(logname); |
| 230 | } |
| 231 | |
| 232 | static void cleanup(void) |
| 233 | { |
| 234 | if (pidfile) |
| 235 | unlink(pidfile); |
| 236 | } |
| 237 | |
| 238 | static void sigdie(int sig) |
| 239 | { |
| 240 | cleanup(); |
| 241 | signal(sig, SIG_DFL); |
| 242 | raise(sig); |
| 243 | } |
| 244 | |
| 245 | static void version(FILE *fp) |
| 246 | { |
| 247 | pquis(fp, "$, TrIPE version " VERSION "\n"); |
| 248 | } |
| 249 | |
| 250 | static void usage(FILE *fp) |
| 251 | { |
| 252 | pquis(fp, "\ |
| 253 | Usage:\n\ |
| 254 | $ [-w] [-options] [command [args]...]\n\ |
| 255 | $ [-Dl] [-f file] [-options]\n\ |
| 256 | Options:\n\ |
| 257 | [-s] [-d directory] [-a socket] [-P pidfile]\n\ |
| 258 | [-p program] [-S arg,arg,...]\n\ |
| 259 | "); |
| 260 | } |
| 261 | |
| 262 | static void help(FILE *fp) |
| 263 | { |
| 264 | version(fp); |
| 265 | fputc('\n', fp); |
| 266 | usage(fp); |
| 267 | fputs("\ |
| 268 | \n\ |
| 269 | Options in full:\n\ |
| 270 | \n\ |
| 271 | -h, --help Show this help text.\n\ |
| 272 | -v, --version Show version number.\n\ |
| 273 | -u, --usage Show brief usage message.\n\ |
| 274 | \n\ |
| 275 | -D, --daemon Become a background task after connecting.\n\ |
| 276 | -d, --directory=DIR Select current directory [default /var/lib/tripe]\n\ |
| 277 | -a, --admin-socket=FILE Select socket to connect to.\n\ |
| 278 | -P, --pidfile=FILE Write process-id to FILE.\n\ |
| 279 | \n\ |
| 280 | -s, --spawn Start server rather than connecting.\n\ |
| 281 | -p, --spawn-path=PATH Specify path to executable.\n\ |
| 282 | -S, --spawn-args=ARGS Specify comma-separated arguments.\n\ |
| 283 | \n\ |
| 284 | -l, --syslog Log messages to system log.\n\ |
| 285 | -f, --logfile=FILE Log messages to FILE.\n\ |
| 286 | -w, --warnings Show warnings when running commands.\n\ |
| 287 | ", fp); |
| 288 | } |
| 289 | |
| 290 | int main(int argc, char *argv[]) |
| 291 | { |
| 292 | const char *dir = "/var/lib/tripe"; |
| 293 | const char *sock = "tripesock"; |
| 294 | const char *spawnpath = "tripe"; |
| 295 | string_v spawnopts = DA_INIT; |
| 296 | char *p; |
| 297 | FILE *pidfp = 0; |
| 298 | |
| 299 | ego(argv[0]); |
| 300 | |
| 301 | if ((p = getenv("TRIPEDIR")) != 0) |
| 302 | dir = p; |
| 303 | |
| 304 | /* --- Parse the arguments --- */ |
| 305 | |
| 306 | for (;;) { |
| 307 | static const struct option opts[] = { |
| 308 | { "help", 0, 0, 'h' }, |
| 309 | { "version", 0, 0, 'v' }, |
| 310 | { "usage", 0, 0, 'u' }, |
| 311 | { "daemon", 0, 0, 'D' }, |
| 312 | { "directory", OPTF_ARGREQ, 0, 'd' }, |
| 313 | { "admin-socket", OPTF_ARGREQ, 0, 'a' }, |
| 314 | { "spawn", 0, 0, 's' }, |
| 315 | { "spawn-path", OPTF_ARGREQ, 0, 'p' }, |
| 316 | { "spawn-args", OPTF_ARGREQ, 0, 'S' }, |
| 317 | { "syslog", 0, 0, 'l' }, |
| 318 | { "logfile", OPTF_ARGREQ, 0, 'f' }, |
| 319 | { "warnings", 0, 0, 'w' }, |
| 320 | { "pidfile", OPTF_ARGREQ, 0, 'P' }, |
| 321 | { 0, 0, 0, 0 } |
| 322 | }; |
| 323 | |
| 324 | int i = mdwopt(argc, argv, "+hvuDd:a:sp:S:lwf:nP:", opts, 0, 0, 0); |
| 325 | if (i < 0) |
| 326 | break; |
| 327 | switch (i) { |
| 328 | case 'h': |
| 329 | help(stdout); |
| 330 | exit(0); |
| 331 | case 'v': |
| 332 | version(stdout); |
| 333 | exit(0); |
| 334 | case 'u': |
| 335 | usage(stdout); |
| 336 | exit(0); |
| 337 | case 'D': |
| 338 | f |= f_daemon | f_noinput; |
| 339 | break; |
| 340 | case 'd': |
| 341 | dir = optarg; |
| 342 | break; |
| 343 | case 'a': |
| 344 | sock = optarg; |
| 345 | break; |
| 346 | case 's': |
| 347 | f |= f_spawn; |
| 348 | break; |
| 349 | case 'p': |
| 350 | f |= f_spawn; |
| 351 | spawnpath = optarg; |
| 352 | break; |
| 353 | case 'S': |
| 354 | f |= f_spawn | f_spawnopts; |
| 355 | for (p = strtok(optarg, ","); p; p = strtok(0, ",")) |
| 356 | DA_PUSH(&spawnopts, p); |
| 357 | break; |
| 358 | case 'l': |
| 359 | f |= f_syslog | f_noinput; |
| 360 | break; |
| 361 | case 'w': |
| 362 | f |= f_warn; |
| 363 | break; |
| 364 | case 'f': |
| 365 | logname = optarg; |
| 366 | f |= f_noinput; |
| 367 | break; |
| 368 | case 'P': |
| 369 | pidfile = optarg; |
| 370 | break; |
| 371 | default: |
| 372 | f |= f_bogus; |
| 373 | break; |
| 374 | } |
| 375 | } |
| 376 | if ((f & f_bogus) || ((f & f_noinput) && optind < argc)) { |
| 377 | usage(stderr); |
| 378 | exit(EXIT_FAILURE); |
| 379 | } |
| 380 | |
| 381 | /* --- Set various things up --- */ |
| 382 | |
| 383 | if (chdir(dir)) { |
| 384 | die(EXIT_FAILURE, "couldn't set `%s' as current directory: %s", |
| 385 | dir, strerror(errno)); |
| 386 | } |
| 387 | if (logname) |
| 388 | logfile(logname); |
| 389 | if (!pidfile && (f & f_daemon) && ((f & f_syslog) || logname)) |
| 390 | pidfile = "tripectl.pid"; |
| 391 | if (pidfile && (pidfp = fopen(pidfile, "w")) == 0) { |
| 392 | die(EXIT_FAILURE, "couldn't open `%s' for writing: %s", |
| 393 | pidfile, strerror(errno)); |
| 394 | } |
| 395 | signal(SIGINT, sigdie); |
| 396 | signal(SIGQUIT, sigdie); |
| 397 | signal(SIGTERM, sigdie); |
| 398 | atexit(cleanup); |
| 399 | |
| 400 | /* --- Connect to the server --- */ |
| 401 | |
| 402 | if (f & f_spawn) { |
| 403 | int pfd[2]; |
| 404 | pid_t kid; |
| 405 | struct sigaction sa; |
| 406 | sigset_t newmask, oldmask; |
| 407 | |
| 408 | sa.sa_handler = reap; |
| 409 | sigemptyset(&sa.sa_mask); |
| 410 | sa.sa_flags = SA_NOCLDSTOP; |
| 411 | #ifdef SA_RESTART |
| 412 | sa.sa_flags |= SA_RESTART; |
| 413 | #endif |
| 414 | sigaction(SIGCHLD, &sa, 0); |
| 415 | |
| 416 | DA_UNSHIFT(&spawnopts, (char *)spawnpath); |
| 417 | DA_UNSHIFT(&spawnopts, (char *)sock); |
| 418 | DA_UNSHIFT(&spawnopts, "-a"); |
| 419 | DA_UNSHIFT(&spawnopts, "-d."); |
| 420 | DA_PUSH(&spawnopts, 0); |
| 421 | if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd)) |
| 422 | die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno)); |
| 423 | sigemptyset(&newmask); |
| 424 | sigaddset(&newmask, SIGCHLD); |
| 425 | sigprocmask(SIG_BLOCK, &newmask, &oldmask); |
| 426 | if ((kid = fork()) < 0) |
| 427 | die(EXIT_FAILURE, "fork failed: %s", strerror(errno)); |
| 428 | if (!kid) { |
| 429 | dup2(pfd[1], STDIN_FILENO); |
| 430 | dup2(pfd[1], STDOUT_FILENO); |
| 431 | close(pfd[1]); |
| 432 | close(pfd[0]); |
| 433 | if (logfp) |
| 434 | fclose(logfp); |
| 435 | closelog(); |
| 436 | if (f & f_daemon) |
| 437 | u_detach(); |
| 438 | execvp(DA(&spawnopts)[0], DA(&spawnopts)); |
| 439 | die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno)); |
| 440 | } |
| 441 | sigprocmask(SIG_SETMASK, &oldmask, 0); |
| 442 | fd = pfd[0]; |
| 443 | close(pfd[1]); |
| 444 | } else { |
| 445 | struct sockaddr_un sun; |
| 446 | size_t sz = strlen(sock) + 1; |
| 447 | if (sz > sizeof(sun.sun_path)) |
| 448 | die(EXIT_FAILURE, "socket name `%s' too long", sock); |
| 449 | memset(&sun, 0, sizeof(sun)); |
| 450 | sun.sun_family = AF_UNIX; |
| 451 | memcpy(sun.sun_path, sock, sz); |
| 452 | sz = sz + offsetof(struct sockaddr_un, sun_path); |
| 453 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
| 454 | die(EXIT_FAILURE, "error making socket: %s", strerror(errno)); |
| 455 | if (connect(fd, (struct sockaddr *)&sun, sz)) { |
| 456 | die(EXIT_FAILURE, "error connecting to `%s': %s", |
| 457 | sun.sun_path, strerror(errno)); |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | if (f & f_daemon) { |
| 462 | if (u_daemon()) |
| 463 | die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno)); |
| 464 | } |
| 465 | if (pidfp) { |
| 466 | fprintf(pidfp, "%li", (long)getpid()); |
| 467 | fclose(pidfp); |
| 468 | } |
| 469 | |
| 470 | /* --- If we're meant to be interactive, do that --- */ |
| 471 | |
| 472 | if (!(f & f_noinput) && optind == argc) { |
| 473 | sel_state sel; |
| 474 | selbuf bu, bs; |
| 475 | |
| 476 | sel_init(&sel); |
| 477 | selbuf_init(&bu, &sel, STDIN_FILENO, uline, &bu); |
| 478 | selbuf_init(&bs, &sel, fd, sline, &bs); |
| 479 | for (;;) { |
| 480 | if (sel_select(&sel) && errno != EINTR && errno != EAGAIN) |
| 481 | die(EXIT_FAILURE, "select failed: %s", strerror(errno)); |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | /* --- If there's a command, submit it --- */ |
| 486 | |
| 487 | if (optind < argc) { |
| 488 | dstr d = DSTR_INIT; |
| 489 | dstr_puts(&d, argv[optind++]); |
| 490 | while (optind < argc) { |
| 491 | dstr_putc(&d, ' '); |
| 492 | dstr_puts(&d, argv[optind++]); |
| 493 | } |
| 494 | dstr_putc(&d, '\n'); |
| 495 | write(fd, d.buf, d.len); |
| 496 | shutdown(fd, 1); |
| 497 | dstr_destroy(&d); |
| 498 | f |= f_command; |
| 499 | } |
| 500 | |
| 501 | /* --- Pull everything else out of the box --- */ |
| 502 | |
| 503 | { |
| 504 | sel_state sel; |
| 505 | selbuf b; |
| 506 | sig hup; |
| 507 | |
| 508 | sel_init(&sel); |
| 509 | selbuf_init(&b, &sel, fd, cline, 0); |
| 510 | |
| 511 | if (f & f_syslog) |
| 512 | openlog(QUIS, 0, LOG_DAEMON); |
| 513 | if (logfp) { |
| 514 | sig_init(&sel); |
| 515 | sig_add(&hup, SIGHUP, sighup, 0); |
| 516 | } |
| 517 | for (;;) { |
| 518 | if (sel_select(&sel) && errno != EINTR && errno != EAGAIN) |
| 519 | die(EXIT_FAILURE, "select failed: %s", strerror(errno)); |
| 520 | } |
| 521 | } |
| 522 | |
| 523 | return (0); |
| 524 | } |
| 525 | |
| 526 | /*----- That's all, folks -------------------------------------------------*/ |