mdw@git.distorted.org.uk Git - tripe/blob - client/tripectl.c

   1 /* -*-c-*-
   2  *
   3  * $Id$
   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 /*----- Header files ------------------------------------------------------*/
  30
  31 #include "config.h"
  32
  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>
  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>
  61 #include <mLib/sig.h>
  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
  77 static const char *pidfile = 0;
  78 static const char *logname = 0;
  79 static FILE *logfp = 0;
  80 static unsigned f = 0;
  81 static int fd;
  82 static const char *bgtag = 0;
  83
  84 #define f_bogus 1u
  85 #define f_spawn 2u
  86 #define f_daemon 4u
  87 #define f_spawnopts 8u
  88 #define f_syslog 16u
  89 #define f_command 32u
  90 #define f_noinput 64u
  91 #define f_warn 128u
  92 #define f_uclose 256u
  93
  94 /*----- Main code ---------------------------------------------------------*/
  95
  96 static void reap(int sig)
  97 {
  98   int e = errno;
  99   while (waitpid(-1, 0, WNOHANG) > 0)
 100     ;
 101   errno = e;
 102 }
 103
 104 static void writelog(const char *cat, const char *msg)
 105 {
 106   char buf[256];
 107   time_t t = time(0);
 108   struct tm *tm = localtime(&t);
 109   strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm);
 110   fprintf(logfp, "%s %s: %s\n", buf, cat, msg);
 111 }
 112
 113 static void checkbg(char **p)
 114 {
 115   char *q = str_getword(p);
 116   if (!q)
 117     die(EXIT_FAILURE, "missing background tag");
 118   if (!bgtag || strcmp(bgtag, q) != 0)
 119     die(EXIT_FAILURE, "unexpected background tag `%s'", q);
 120 }
 121
 122 static void checkfg(void)
 123 {
 124   if (bgtag)
 125     die(EXIT_FAILURE, "unexpected foreground response");
 126 }
 127
 128 static void cline(char *p, size_t len, void *b)
 129 {
 130   char *q;
 131   if (!p) {
 132     if (f & f_command)
 133       die(EXIT_FAILURE, "server dropped the connection");
 134     exit(0);
 135   }
 136   q = str_getword(&p);
 137   if (!q)
 138     return;
 139   if (strcmp(q, "WARN") == 0) {
 140     if (f & f_syslog)
 141       syslog(LOG_WARNING, "%s", p);
 142     if (logfp)
 143       writelog("warning", p);
 144     if (f & f_warn)
 145       fprintf(stderr, "Warning: %s\n", p);
 146   } else if (strcmp(q, "TRACE") == 0) {
 147     if (f & f_syslog)
 148       syslog(LOG_DEBUG, "%s", p);
 149     if (logfp)
 150       writelog("debug", p);
 151   } else if (!(f & f_command)) {
 152     if (f & f_syslog)
 153       syslog(LOG_ERR, "unexpected output `%s %s'", q, p);
 154     if (logfp) {
 155       dstr d = DSTR_INIT;
 156       dstr_putf(&d, "unexpected output `%s %s'", q, p);
 157       writelog("error", d.buf);
 158       dstr_destroy(&d);
 159     }
 160   } else if (strcmp(q, "FAIL") == 0) {
 161     checkfg();
 162     die(EXIT_FAILURE, "%s", p);
 163   } else if (strcmp(q, "INFO") == 0) {
 164     checkfg();
 165     puts(p);
 166   } else if (strcmp(q, "OK") == 0) {
 167     checkfg();
 168     exit(0);
 169   } else if (strcmp(q, "BGDETACH") == 0) {
 170     if (bgtag)
 171       die(EXIT_FAILURE, "repeat detach");
 172     bgtag = xstrdup(p);
 173   } else if (strcmp(q, "BGOK") == 0) {
 174     checkbg(&p);
 175     exit(0);
 176   } else if (strcmp(q, "BGINFO") == 0) {
 177     checkbg(&p);
 178     puts(p);
 179   } else if (strcmp(q, "BGFAIL") == 0) {
 180     checkbg(&p);
 181     die(EXIT_FAILURE, "%s", p);
 182   } else
 183     die(EXIT_FAILURE, "unexpected output `%s %s'", q, p);
 184 }
 185
 186 static void sline(char *p, size_t len, void *b)
 187 {
 188   if (!p) {
 189     if (!(f & f_uclose))
 190       moan("server closed the connection");
 191     exit(0);
 192   }
 193   puts(p);
 194 }
 195
 196 static void uline(char *p, size_t len, void *b)
 197 {
 198   if (!p) {
 199     selbuf_destroy(b);
 200     shutdown(fd, 1);
 201     f |= f_uclose;
 202   } else {
 203     p[len] = '\n';
 204     errno = EIO;
 205     if (write(fd, p, len + 1) != len + 1)
 206       moan("write failed: %s", strerror(errno));
 207   }
 208 }
 209
 210 static void setup(const char *cmd)
 211 {
 212   dstr d = DSTR_INIT;
 213   char ch;
 214   char *p, *q;
 215   int n;
 216
 217   dstr_puts(&d, cmd);
 218   dstr_putc(&d, '\n');
 219   errno = EIO; /* Relax: be vague */
 220   if (write(fd, d.buf, d.len) != d.len) {
 221     die(EXIT_FAILURE, "error sending setup command `%s': %s",
 222         cmd, strerror(errno));
 223   }
 224   dstr_reset(&d);
 225   for (;;) {
 226     n = read(fd, &ch, 1);
 227     if (!n)
 228       die(EXIT_FAILURE, "unexpected EOF during setup");
 229     if (n < 0) {
 230       die(EXIT_FAILURE, "error receiving reply to `%s': %s",
 231           cmd, strerror(errno));
 232     }
 233     if (d.len < 256)
 234       dstr_putc(&d, ch);
 235     if (ch == '\n') {
 236       p = d.buf;
 237       q = str_getword(&p);
 238       if (!q)
 239         ;
 240       else if (strcmp(q, "OK") == 0)
 241         return;
 242       else if (strcmp(q, "FAIL") == 0)
 243         die(EXIT_FAILURE, "setup command `%s' failed: %s", cmd, p);
 244       dstr_reset(&d);
 245     }
 246   }
 247 }
 248
 249 static void logfile(const char *name)
 250 {
 251   FILE *fp;
 252
 253   if ((fp = fopen(name, "a")) != 0) {
 254     if (logfp)
 255       fclose(logfp);
 256     logfp =  fp;
 257     setvbuf(logfp, 0, _IOLBF, BUFSIZ);
 258   } else {
 259     dstr d = DSTR_INIT;
 260     dstr_putf(&d, "error opening logfile `%s': %s", name, strerror(errno));
 261     if (logfp)
 262       writelog("error", d.buf);
 263     else if (logname)
 264       die(EXIT_FAILURE, d.buf);
 265     if (f & f_syslog)
 266       syslog(LOG_ERR, d.buf);
 267     dstr_destroy(&d);
 268   }
 269 }
 270
 271 static void sighup(int sig, void *v) { logfile(logname); }
 272
 273 static void cleanup(void)
 274 {
 275   if (pidfile)
 276     unlink(pidfile);
 277 }
 278
 279 static void sigdie(int sig)
 280 {
 281   cleanup();
 282   signal(sig, SIG_DFL);
 283   raise(sig);
 284 }
 285
 286 static void version(FILE *fp)
 287   { pquis(fp, "$, TrIPE version " VERSION "\n"); }
 288
 289 static void usage(FILE *fp)
 290 {
 291   pquis(fp, "\
 292 Usage:\n\
 293         $ [-w] [-OPTIONS] [COMMAND [ARGS]...]\n\
 294         $ [-Dl] [-f FILE] [-OPTIONS]\n\
 295 Options:\n\
 296         [-s] [-d DIRECTORY] [-a SOCKET] [-P PIDFILE]\n\
 297         [-p PROGRAM] [-S ARG,ARG,...]\n\
 298 ");
 299 }
 300
 301 static void help(FILE *fp)
 302 {
 303   version(fp);
 304   fputc('\n', fp);
 305   usage(fp);
 306   fputs("\
 307 \n\
 308 Options in full:\n\
 309 \n\
 310 -h, --help              Show this help text.\n\
 311 -v, --version           Show version number.\n\
 312 -u, --usage             Show brief usage message.\n\
 313 \n\
 314 -D, --daemon            Become a background task after connecting.\n\
 315 -d, --directory=DIR     Select current directory [default " CONFIGDIR "].\n\
 316 -a, --admin-socket=FILE Select socket to connect to\n\
 317                           [default " SOCKETDIR "/tripesock].\n\
 318 -P, --pidfile=FILE      Write process-id to FILE.\n\
 319 \n\
 320 -s, --spawn             Start server rather than connecting.\n\
 321 -p, --spawn-path=PATH   Specify path to executable.\n\
 322 -S, --spawn-args=ARGS   Specify comma-separated arguments.\n\
 323 \n\
 324 -l, --syslog            Log messages to system log.\n\
 325 -f, --logfile=FILE      Log messages to FILE.\n\
 326 -w, --warnings          Show warnings when running commands.\n\
 327 ", fp);
 328 }
 329
 330 int main(int argc, char *argv[])
 331 {
 332   const char *dir = CONFIGDIR;
 333   const char *sock = SOCKETDIR "/tripesock";
 334   const char *spawnpath = "tripe";
 335   string_v spawnopts = DA_INIT;
 336   char *p;
 337   FILE *pidfp = 0;
 338
 339   ego(argv[0]);
 340
 341   if ((p = getenv("TRIPEDIR")) != 0)
 342     dir = p;
 343
 344   /* --- Parse the arguments --- */
 345
 346   for (;;) {
 347     static const struct option opts[] = {
 348       { "help",         0,              0,      'h' },
 349       { "version",      0,              0,      'v' },
 350       { "usage",        0,              0,      'u' },
 351       { "daemon",       0,              0,      'D' },
 352       { "directory",    OPTF_ARGREQ,    0,      'd' },
 353       { "admin-socket", OPTF_ARGREQ,    0,      'a' },
 354       { "spawn",        0,              0,      's' },
 355       { "spawn-path",   OPTF_ARGREQ,    0,      'p' },
 356       { "spawn-args",   OPTF_ARGREQ,    0,      'S' },
 357       { "syslog",       0,              0,      'l' },
 358       { "logfile",      OPTF_ARGREQ,    0,      'f' },
 359       { "warnings",     0,              0,      'w' },
 360       { "pidfile",      OPTF_ARGREQ,    0,      'P' },
 361       { 0,              0,              0,      0 }
 362     };
 363
 364     int i = mdwopt(argc, argv, "+hvuDd:a:sp:S:lwf:nP:", opts, 0, 0, 0);
 365     if (i < 0)
 366       break;
 367     switch (i) {
 368       case 'h':
 369         help(stdout);
 370         exit(0);
 371       case 'v':
 372         version(stdout);
 373         exit(0);
 374       case 'u':
 375         usage(stdout);
 376         exit(0);
 377       case 'D':
 378         f |= f_daemon | f_noinput;
 379         break;
 380       case 'd':
 381         dir = optarg;
 382         break;
 383       case 'a':
 384         sock = optarg;
 385         break;
 386       case 's':
 387         f |= f_spawn;
 388         break;
 389       case 'p':
 390         f |= f_spawn;
 391         spawnpath = optarg;
 392         break;
 393       case 'S':
 394         f |= f_spawn | f_spawnopts;
 395         for (p = strtok(optarg, ","); p; p = strtok(0, ","))
 396           DA_PUSH(&spawnopts, p);
 397         break;
 398       case 'l':
 399         f |= f_syslog | f_noinput;
 400         break;
 401       case 'w':
 402         f |= f_warn;
 403         break;
 404       case 'f':
 405         logname = optarg;
 406         f |= f_noinput;
 407         break;
 408       case 'P':
 409         pidfile = optarg;
 410         break;
 411       default:
 412         f |= f_bogus;
 413         break;
 414     }
 415   }
 416   if ((f & f_bogus) || ((f & f_noinput) && optind < argc)) {
 417     usage(stderr);
 418     exit(EXIT_FAILURE);
 419   }
 420
 421   /* --- Set various things up --- */
 422
 423   if (chdir(dir)) {
 424     die(EXIT_FAILURE, "couldn't set `%s' as current directory: %s",
 425         dir, strerror(errno));
 426   }
 427   if (logname)
 428     logfile(logname);
 429   if (!pidfile && (f & f_daemon) && ((f & f_syslog) || logname))
 430     pidfile = "tripectl.pid";
 431   if (pidfile && (pidfp = fopen(pidfile, "w")) == 0) {
 432     die(EXIT_FAILURE, "couldn't open `%s' for writing: %s",
 433         pidfile, strerror(errno));
 434   }
 435   signal(SIGINT, sigdie);
 436   signal(SIGQUIT, sigdie);
 437   signal(SIGTERM, sigdie);
 438   atexit(cleanup);
 439
 440   /* --- Connect to the server --- */
 441
 442   if (f & f_spawn) {
 443     int pfd[2];
 444     pid_t kid;
 445     struct sigaction sa;
 446     sigset_t newmask, oldmask;
 447
 448     sa.sa_handler = reap;
 449     sigemptyset(&sa.sa_mask);
 450     sa.sa_flags = SA_NOCLDSTOP;
 451 #ifdef SA_RESTART
 452     sa.sa_flags |= SA_RESTART;
 453 #endif
 454     sigaction(SIGCHLD, &sa, 0);
 455
 456     DA_UNSHIFT(&spawnopts, (char *)sock);
 457     DA_UNSHIFT(&spawnopts, "-a");
 458     DA_UNSHIFT(&spawnopts, "-d.");
 459     DA_UNSHIFT(&spawnopts, (char *)spawnpath);
 460     DA_PUSH(&spawnopts, 0);
 461     if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd))
 462       die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno));
 463     sigemptyset(&newmask);
 464     sigaddset(&newmask, SIGCHLD);
 465     sigprocmask(SIG_BLOCK, &newmask, &oldmask);
 466     if ((kid = fork()) < 0)
 467       die(EXIT_FAILURE, "fork failed: %s", strerror(errno));
 468     if (!kid) {
 469       dup2(pfd[1], STDIN_FILENO);
 470       dup2(pfd[1], STDOUT_FILENO);
 471       close(pfd[1]);
 472       close(pfd[0]);
 473       if (logfp)
 474         fclose(logfp);
 475       if (pidfp)
 476         fclose(pidfp);
 477       closelog();
 478       if (f & f_daemon)
 479         u_detach();
 480       execvp(DA(&spawnopts)[0], DA(&spawnopts));
 481       die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno));
 482     }
 483     sigprocmask(SIG_SETMASK, &oldmask, 0);
 484     fd = pfd[0];
 485     close(pfd[1]);
 486   } else {
 487     struct sockaddr_un sun;
 488     size_t sz = strlen(sock) + 1;
 489     if (sz > sizeof(sun.sun_path))
 490       die(EXIT_FAILURE, "socket name `%s' too long", sock);
 491     memset(&sun, 0, sizeof(sun));
 492     sun.sun_family = AF_UNIX;
 493     memcpy(sun.sun_path, sock, sz);
 494     sz = sz + offsetof(struct sockaddr_un, sun_path);
 495     if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
 496       die(EXIT_FAILURE, "error making socket: %s", strerror(errno));
 497     if (connect(fd, (struct sockaddr *)&sun, sz)) {
 498       die(EXIT_FAILURE, "error connecting to `%s': %s",
 499           sun.sun_path, strerror(errno));
 500     }
 501   }
 502
 503   if (f & f_daemon) {
 504     if (u_daemon())
 505       die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno));
 506   }
 507   if (pidfp) {
 508     fprintf(pidfp, "%li\n", (long)getpid());
 509     fclose(pidfp);
 510   }
 511   signal(SIGPIPE, SIG_IGN);
 512
 513   /* --- If we're meant to be interactive, do that --- */
 514
 515   if (optind == argc)
 516     setup("WATCH -A+tw");
 517   if (!(f & f_noinput) && optind == argc) {
 518     sel_state sel;
 519     selbuf bu, bs;
 520
 521     sel_init(&sel);
 522     selbuf_init(&bu, &sel, STDIN_FILENO, uline, &bu);
 523     selbuf_init(&bs, &sel, fd, sline, &bs);
 524     for (;;) {
 525       if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
 526         die(EXIT_FAILURE, "select failed: %s", strerror(errno));
 527     }
 528   }
 529
 530   /* --- If there's a command, submit it --- */
 531
 532   if (optind < argc) {
 533     dstr d = DSTR_INIT;
 534     setup((f & f_warn) ? "WATCH -A+w" : "WATCH -A");
 535     dstr_puts(&d, argv[optind++]);
 536     while (optind < argc) {
 537       dstr_putc(&d, ' ');
 538       dstr_puts(&d, argv[optind++]);
 539     }
 540     dstr_putc(&d, '\n');
 541     errno = EIO;
 542     if (write(fd, d.buf, d.len) != d.len || shutdown(fd, 1))
 543       die(EXIT_FAILURE, "write failed: %s", strerror(errno));
 544     dstr_destroy(&d);
 545     f |= f_command;
 546   }
 547
 548   /* --- Pull everything else out of the box --- */
 549
 550   {
 551     sel_state sel;
 552     selbuf b;
 553     sig hup;
 554
 555     sel_init(&sel);
 556     selbuf_init(&b, &sel, fd, cline, 0);
 557
 558     if (f & f_syslog)
 559       openlog(QUIS, 0, LOG_DAEMON);
 560     if (logfp) {
 561       sig_init(&sel);
 562       sig_add(&hup, SIGHUP, sighup, 0);
 563     }
 564     for (;;) {
 565       if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
 566         die(EXIT_FAILURE, "select failed: %s", strerror(errno));
 567     }
 568   }
 569
 570   return (0);
 571 }
 572
 573 /*----- That's all, folks -------------------------------------------------*/