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