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

   1 /* -*-c-*-
   2  *
   3  * Client for TrIPE
   4  *
   5  * (c) 2001 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Trivial IP Encryption (TrIPE).
  11  *
  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.
  16  *
  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.
  21  *
  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.
  25  */
  26
  27 /*----- Header files ------------------------------------------------------*/
  28
  29 #include "config.h"
  30
  31 #include <ctype.h>
  32 #include <errno.h>
  33 #include <signal.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <time.h>
  38
  39 #include <sys/types.h>
  40 #include <sys/time.h>
  41 #include <unistd.h>
  42 #include <fcntl.h>
  43 #include <sys/wait.h>
  44 #include <syslog.h>
  45
  46 #include <sys/socket.h>
  47 #include <sys/un.h>
  48 #include <arpa/inet.h>
  49 #include <netdb.h>
  50
  51 #include <mLib/alloc.h>
  52 #include <mLib/daemonize.h>
  53 #include <mLib/darray.h>
  54 #include <mLib/dstr.h>
  55 #include <mLib/macros.h>
  56 #include <mLib/mdup.h>
  57 #include <mLib/mdwopt.h>
  58 #include <mLib/quis.h>
  59 #include <mLib/report.h>
  60 #include <mLib/sel.h>
  61 #include <mLib/selbuf.h>
  62 #include <mLib/sig.h>
  63 #include <mLib/str.h>
  64 #include <mLib/versioncmp.h>
  65
  66 #include "util.h"
  67
  68 #undef sun
  69
  70 /*----- Data structures ---------------------------------------------------*/
  71
  72 #ifndef STRING_V
  73 #  define STRING_V
  74    DA_DECL(string_v, char *);
  75 #endif
  76
  77 /*----- Static variables --------------------------------------------------*/
  78
  79 static sel_state sel;
  80 static const char *pidfile = 0;
  81 static const char *logname = 0;
  82 static FILE *logfp = 0;
  83 static unsigned f = 0;
  84 static int fd;
  85 static const char *bgtag = 0;
  86
  87 #define f_bogus 1u
  88 #define f_spawn 2u
  89 #define f_daemon 4u
  90 #define f_spawnopts 8u
  91 #define f_syslog 16u
  92 #define f_command 32u
  93 #define f_noinput 64u
  94 #define f_warn 128u
  95 #define f_uclose 256u
  96 #define f_losing 512u
  97 #define f_nostamp 1024u
  98
  99 /*----- Main code ---------------------------------------------------------*/
 100
 101 static void reap(int sig)
 102 {
 103   int e = errno;
 104   while (waitpid(-1, 0, WNOHANG) > 0)
 105     ;
 106   errno = e;
 107 }
 108
 109 static void writelog(const char *cat, const char *msg)
 110 {
 111   char buf[256];
 112   time_t t = time(0);
 113   struct tm *tm = localtime(&t);
 114   if (f & f_nostamp) buf[0] = 0;
 115   else strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S ", tm);
 116   fprintf(logfp, "%s%s: %s\n", buf, cat, msg);
 117 }
 118
 119 static void checkbg(char **p)
 120 {
 121   char *q = str_getword(p);
 122   if (!q)
 123     die(EXIT_FAILURE, "missing background tag");
 124   if (!bgtag || strcmp(bgtag, q) != 0)
 125     die(EXIT_FAILURE, "unexpected background tag `%s'", q);
 126 }
 127
 128 static void PRINTF_LIKE(2, 3) dolog(int prio, const char *msg, ...)
 129 {
 130   va_list ap;
 131   dstr d = DSTR_INIT;
 132   const char *cat;
 133
 134   va_start(ap, msg);
 135   dstr_vputf(&d, msg, &ap);
 136   va_end(ap);
 137   if (f & f_syslog) syslog(prio, "%s", d.buf);
 138   if (logfp) {
 139     switch (prio) {
 140       case LOG_WARNING: cat = "warning"; break;
 141       case LOG_DEBUG: cat = "debug"; break;
 142       case LOG_ERR: cat = "error"; break;
 143       default: cat = "message"; break;
 144     }
 145     writelog(cat, d.buf);
 146   }
 147   if (prio == LOG_WARNING && (f & f_warn))
 148     fprintf(stderr, "Warning: %s\n", d.buf);
 149   dstr_destroy(&d);
 150 }
 151
 152 static void checkfg(void)
 153   { if (bgtag) die(EXIT_FAILURE, "unexpected foreground response"); }
 154
 155 static void cline(char *p, size_t len, void *b)
 156 {
 157   char *q;
 158   if (!p) {
 159     if (f & f_command)
 160       die(EXIT_FAILURE, "server dropped the connection");
 161     f &= ~f_losing;
 162     exit(0);
 163   }
 164   q = str_getword(&p);
 165   if (!q)
 166     return;
 167   if (strcmp(q, "WARN") == 0)
 168     dolog(LOG_WARNING, "%s", p);
 169   else if (strcmp(q, "TRACE") == 0)
 170     dolog(LOG_DEBUG, "%s", p);
 171   else if (!(f & f_command))
 172     dolog(LOG_ERR, "unexpected output `%s %s'", q, p);
 173   else if (strcmp(q, "FAIL") == 0) {
 174     checkfg();
 175     die(EXIT_FAILURE, "%s", p);
 176   } else if (strcmp(q, "INFO") == 0) {
 177     checkfg();
 178     puts(p);
 179     fflush(stdout);
 180   } else if (strcmp(q, "OK") == 0) {
 181     checkfg();
 182     exit(0);
 183   } else if (strcmp(q, "BGDETACH") == 0) {
 184     if (bgtag)
 185       die(EXIT_FAILURE, "repeat detach");
 186     bgtag = xstrdup(p);
 187   } else if (strcmp(q, "BGOK") == 0) {
 188     checkbg(&p);
 189     exit(0);
 190   } else if (strcmp(q, "BGINFO") == 0) {
 191     checkbg(&p);
 192     puts(p);
 193     fflush(stdout);
 194   } else if (strcmp(q, "BGFAIL") == 0) {
 195     checkbg(&p);
 196     die(EXIT_FAILURE, "%s", p);
 197   } else
 198     die(EXIT_FAILURE, "unexpected output `%s %s'", q, p);
 199 }
 200
 201 static void sline(char *p, size_t len, void *b)
 202 {
 203   if (!p) {
 204     if (!(f & f_uclose))
 205       moan("server closed the connection");
 206     exit(0);
 207   }
 208   puts(p);
 209   fflush(stdout);
 210 }
 211
 212 static void uline(char *p, size_t len, void *b)
 213 {
 214   if (!p) {
 215     selbuf_destroy(b);
 216     shutdown(fd, 1);
 217     f |= f_uclose;
 218   } else {
 219     p[len] = '\n';
 220     errno = EIO;
 221     if (write(fd, p, len + 1) != len + 1)
 222       moan("write failed: %s", strerror(errno));
 223   }
 224 }
 225
 226 static void eline(char *p, size_t len, void *b)
 227 {
 228   if (p)
 229     dolog(LOG_WARNING, "(stderr): %s", p);
 230   else {
 231     selbuf_destroy(b);
 232     close(fd);
 233   }
 234 }
 235
 236 static void setup(const char *cmd)
 237 {
 238   dstr d = DSTR_INIT;
 239   char ch;
 240   char *p, *q;
 241   int n;
 242
 243   dstr_puts(&d, cmd);
 244   dstr_putc(&d, '\n');
 245   errno = EIO; /* Relax: be vague */
 246   if (write(fd, d.buf, d.len) != d.len) {
 247     die(EXIT_FAILURE, "error sending setup command `%s': %s",
 248         cmd, strerror(errno));
 249   }
 250   dstr_reset(&d);
 251   for (;;) {
 252     n = read(fd, &ch, 1);
 253     if (!n)
 254       die(EXIT_FAILURE, "unexpected EOF during setup");
 255     if (n < 0) {
 256       die(EXIT_FAILURE, "error receiving reply to `%s': %s",
 257           cmd, strerror(errno));
 258     }
 259     if (d.len < 256)
 260       dstr_putc(&d, ch);
 261     if (ch == '\n') {
 262       p = d.buf;
 263       q = str_getword(&p);
 264       if (!q)
 265         ;
 266       else if (strcmp(q, "OK") == 0)
 267         return;
 268       else if (strcmp(q, "FAIL") == 0)
 269         die(EXIT_FAILURE, "setup command `%s' failed: %s", cmd, p);
 270       dstr_reset(&d);
 271     }
 272   }
 273 }
 274
 275 static void logfile(const char *name)
 276 {
 277   FILE *fp;
 278
 279   if (strcmp(name, "-") == 0)
 280     logfp = stdout;
 281   else if (strcmp(name, "!") == 0)
 282     logfp = stderr;
 283   else if ((fp = fopen(name, "a")) != 0) {
 284     if (logfp)
 285       fclose(logfp);
 286     logfp =  fp;
 287     setvbuf(logfp, 0, _IOLBF, BUFSIZ);
 288   } else {
 289     dstr d = DSTR_INIT;
 290     dstr_putf(&d, "error opening logfile `%s': %s", name, strerror(errno));
 291     if (logfp)
 292       writelog("error", d.buf);
 293     else if (logname)
 294       die(EXIT_FAILURE, "%s", d.buf);
 295     if (f & f_syslog)
 296       syslog(LOG_ERR, "%s", d.buf);
 297     dstr_destroy(&d);
 298   }
 299 }
 300
 301 static void sighup(int sig, void *v) { logfile(logname); }
 302
 303 static void cleanup(void) { if (pidfile) unlink(pidfile); }
 304
 305 static void sigdie(int sig)
 306   { cleanup(); signal(sig, SIG_DFL); raise(sig); }
 307
 308 static void PRINTF_LIKE(2, 3) putarg(string_v *av, const char *fmt, ...)
 309 {
 310   va_list ap;
 311   dstr d = DSTR_INIT;
 312
 313   va_start(ap, fmt);
 314   dstr_vputf(&d, fmt, &ap);
 315   dstr_putz(&d);
 316   va_end(ap);
 317   DA_UNSHIFT(av, xstrdup(d.buf));
 318   dstr_destroy(&d);
 319 }
 320
 321 static void version(FILE *fp)
 322   { pquis(fp, "$, TrIPE version " VERSION "\n"); }
 323
 324 static void usage(FILE *fp)
 325 {
 326   pquis(fp, "\
 327 Usage:\n\
 328         $ [-w] [-OPTIONS] [COMMAND [ARGS]...]\n\
 329         $ [-Dl] [-f FILE] [-OPTIONS]\n\
 330 Options:\n\
 331         [-s] [-d DIRECTORY] [-a SOCKET] [-P PIDFILE]\n\
 332         [-p PROGRAM] [-S ARG,ARG,...]\n\
 333 ");
 334 }
 335
 336 static void help(FILE *fp)
 337 {
 338   version(fp);
 339   fputc('\n', fp);
 340   usage(fp);
 341   fputs("\
 342 \n\
 343 Options in full:\n\
 344 \n\
 345 -h, --help              Show this help text.\n\
 346 -v, --version           Show version number.\n\
 347 -u, --usage             Show brief usage message.\n\
 348 \n\
 349 -D, --daemon            Become a background task after connecting.\n\
 350 -d, --directory=DIR     Select current directory [default " CONFIGDIR "].\n\
 351 -U, --setuid=USER       Set uid to USER after initialization.\n\
 352 -G, --setgid=GROUP      Set gid to GROUP after initialization.\n\
 353 -a, --admin-socket=FILE Select socket to connect to\n\
 354                           [default " SOCKETDIR "/tripesock].\n\
 355 -P, --pidfile=FILE      Write process-id to FILE.\n\
 356 \n\
 357 -s, --spawn             Start server rather than connecting.\n\
 358 -p, --spawn-path=PATH   Specify path to executable.\n\
 359 -S, --spawn-args=ARGS   Specify comma-separated arguments.\n\
 360 \n\
 361 -l, --syslog            Log messages to system log.\n\
 362 -f, --logfile=FILE      Log messages to FILE.\n\
 363 -t, --no-timestamp      When logging to a file, don't emit timestamps.\n\
 364 -w, --warnings          Show warnings when running commands.\n\
 365 ", fp);
 366 }
 367
 368 int main(int argc, char *argv[])
 369 {
 370   const char *dir = CONFIGDIR;
 371   const char *sock = SOCKETDIR "/tripesock";
 372   const char *spawnpath = "tripe";
 373   string_v spawnopts = DA_INIT;
 374   char *p;
 375   FILE *pidfp = 0;
 376   int i;
 377   size_t sz;
 378   uid_t u = -1;
 379   gid_t g = -1;
 380   int pfd[2], efd[2];
 381   mdup_fd md[3];
 382   pid_t kid;
 383   struct sigaction sa;
 384   sigset_t newmask, oldmask;
 385   struct sockaddr_un sun;
 386   selbuf bu, bs, be;
 387   dstr d = DSTR_INIT;
 388   sig hup;
 389
 390   ego(argv[0]);
 391
 392   if ((p = getenv("TRIPEDIR")) != 0)
 393     dir = p;
 394   if ((p = getenv("TRIPESOCK")) != 0)
 395     sock = p;
 396
 397   /* --- Parse the arguments --- */
 398
 399   for (;;) {
 400     static const struct option opts[] = {
 401       { "help",         0,              0,      'h' },
 402       { "version",      0,              0,      'v' },
 403       { "usage",        0,              0,      'u' },
 404       { "daemon",       0,              0,      'D' },
 405       { "uid",          OPTF_ARGREQ,    0,      'U' },
 406       { "setuid",       OPTF_ARGREQ,    0,      'U' },
 407       { "gid",          OPTF_ARGREQ,    0,      'G' },
 408       { "setgid",       OPTF_ARGREQ,    0,      'G' },
 409       { "directory",    OPTF_ARGREQ,    0,      'd' },
 410       { "admin-socket", OPTF_ARGREQ,    0,      'a' },
 411       { "spawn",        0,              0,      's' },
 412       { "spawn-path",   OPTF_ARGREQ,    0,      'p' },
 413       { "spawn-args",   OPTF_ARGREQ,    0,      'S' },
 414       { "syslog",       0,              0,      'l' },
 415       { "logfile",      OPTF_ARGREQ,    0,      'f' },
 416       { "no-timestamp", 0,              0,      't' },
 417       { "warnings",     0,              0,      'w' },
 418       { "pidfile",      OPTF_ARGREQ,    0,      'P' },
 419       { 0,              0,              0,      0 }
 420     };
 421
 422     i = mdwopt(argc, argv, "+hvuDU:G:d:a:sp:S:lwf:nP:t", opts, 0, 0, 0);
 423     if (i < 0)
 424       break;
 425     switch (i) {
 426       case 'h':
 427         help(stdout);
 428         exit(0);
 429       case 'v':
 430         version(stdout);
 431         exit(0);
 432       case 'u':
 433         usage(stdout);
 434         exit(0);
 435       case 'D':
 436         f |= f_daemon | f_noinput;
 437         break;
 438       case 'U':
 439         u = u_getuser(optarg, &g);
 440         break;
 441       case 'G':
 442         g = u_getgroup(optarg);
 443         break;
 444       case 'd':
 445         dir = optarg;
 446         break;
 447       case 'a':
 448         sock = optarg;
 449         break;
 450       case 's':
 451         f |= f_spawn;
 452         break;
 453       case 'p':
 454         f |= f_spawn;
 455         spawnpath = optarg;
 456         break;
 457       case 'S':
 458         f |= f_spawn | f_spawnopts;
 459         for (p = strtok(optarg, ","); p; p = strtok(0, ","))
 460           DA_PUSH(&spawnopts, p);
 461         break;
 462       case 'l':
 463         f |= f_syslog | f_noinput;
 464         break;
 465       case 'w':
 466         f |= f_warn;
 467         break;
 468       case 'f':
 469         logname = optarg;
 470         f |= f_noinput;
 471         break;
 472       case 't':
 473         f |= f_nostamp;
 474         break;
 475       case 'P':
 476         pidfile = optarg;
 477         break;
 478       default:
 479         f |= f_bogus;
 480         break;
 481     }
 482   }
 483   if ((f & f_bogus) || ((f & f_noinput) && optind < argc)) {
 484     usage(stderr);
 485     exit(EXIT_FAILURE);
 486   }
 487
 488   /* --- Set various things up --- */
 489
 490   if (chdir(dir)) {
 491     die(EXIT_FAILURE, "couldn't set `%s' as current directory: %s",
 492         dir, strerror(errno));
 493   }
 494   if (!pidfile && (f & f_daemon) && ((f & f_syslog) || logname))
 495     pidfile = "tripectl.pid";
 496   if (pidfile && (pidfp = fopen(pidfile, "w")) == 0) {
 497     die(EXIT_FAILURE, "couldn't open `%s' for writing: %s",
 498         pidfile, strerror(errno));
 499   }
 500   sel_init(&sel);
 501   sig_init(&sel);
 502   signal(SIGINT, sigdie);
 503   signal(SIGQUIT, sigdie);
 504   signal(SIGTERM, sigdie);
 505   atexit(cleanup);
 506
 507   /* --- Connect to the server --- */
 508
 509   if (f & f_spawn) {
 510     sa.sa_handler = reap;
 511     sigemptyset(&sa.sa_mask);
 512     sa.sa_flags = SA_NOCLDSTOP;
 513 #ifdef SA_RESTART
 514     sa.sa_flags |= SA_RESTART;
 515 #endif
 516     sigaction(SIGCHLD, &sa, 0);
 517
 518     DA_PUSH(&spawnopts, 0);
 519     if (g != (gid_t)-1) putarg(&spawnopts, "-G%lu", (unsigned long)g);
 520     if (u != (uid_t)-1) putarg(&spawnopts, "-U%lu", (unsigned long)u);
 521     putarg(&spawnopts, "-a%s", sock);
 522     putarg(&spawnopts, "-d.");
 523     putarg(&spawnopts, "-F");
 524     putarg(&spawnopts, "%s", spawnpath);
 525     if (socketpair(PF_UNIX, SOCK_STREAM, 0, pfd) || pipe(efd))
 526       die(EXIT_FAILURE, "error from socketpair: %s", strerror(errno));
 527     sigemptyset(&newmask);
 528     sigaddset(&newmask, SIGCHLD);
 529     sigprocmask(SIG_BLOCK, &newmask, &oldmask);
 530     if ((kid = fork()) < 0)
 531       die(EXIT_FAILURE, "fork failed: %s", strerror(errno));
 532     if (!kid) {
 533       close(pfd[0]); close(efd[0]);
 534       sigprocmask(SIG_SETMASK, &oldmask, 0);
 535       md[0].cur = pfd[1]; md[0].want = STDIN_FILENO;
 536       md[1].cur = pfd[1]; md[1].want = STDOUT_FILENO;
 537       md[2].cur = efd[1]; md[2].want = STDERR_FILENO;
 538       mdup(md, 3);
 539       if (pidfp) fclose(pidfp);
 540       closelog();
 541       if (f & f_daemon) detachtty();
 542       execvp(DA(&spawnopts)[0], DA(&spawnopts));
 543       die(127, "couldn't exec `%s': %s", spawnpath, strerror(errno));
 544     }
 545     sigprocmask(SIG_SETMASK, &oldmask, 0);
 546     fd = pfd[0];
 547     close(pfd[1]); close(efd[1]);
 548     selbuf_init(&be, &sel, efd[0], eline, &be);
 549   } else {
 550     sz = strlen(sock) + 1;
 551     if (sz > sizeof(sun.sun_path))
 552       die(EXIT_FAILURE, "socket name `%s' too long", sock);
 553     memset(&sun, 0, sizeof(sun));
 554     sun.sun_family = AF_UNIX;
 555     memcpy(sun.sun_path, sock, sz);
 556     sz = sz + offsetof(struct sockaddr_un, sun_path);
 557     if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
 558       die(EXIT_FAILURE, "error making socket: %s", strerror(errno));
 559     if (connect(fd, (struct sockaddr *)&sun, sz)) {
 560       die(EXIT_FAILURE, "error connecting to `%s': %s",
 561           sun.sun_path, strerror(errno));
 562     }
 563   }
 564
 565   f |= f_losing; /* pessimism */
 566   u_setugid(u, g);
 567   if (logname)
 568     logfile(logname);
 569   if (f & f_daemon) {
 570     if (daemonize())
 571       die(EXIT_FAILURE, "error becoming daemon: %s", strerror(errno));
 572   }
 573   if (pidfp) {
 574     fprintf(pidfp, "%li\n", (long)getpid());
 575     fclose(pidfp);
 576   }
 577   signal(SIGPIPE, SIG_IGN);
 578
 579   /* --- If we're meant to be interactive, do that --- */
 580
 581   if (optind == argc)
 582     setup("WATCH -A+tw");
 583   if (!(f & f_noinput) && optind == argc) {
 584     selbuf_init(&bu, &sel, STDIN_FILENO, uline, &bu);
 585     selbuf_init(&bs, &sel, fd, sline, &bs);
 586     for (;;) {
 587       if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
 588         die(EXIT_FAILURE, "select failed: %s", strerror(errno));
 589     }
 590   }
 591
 592   /* --- If there's a command, submit it --- */
 593
 594   if (optind < argc) {
 595     setup((f & f_warn) ? "WATCH -A+w" : "WATCH -A");
 596     while (optind < argc)
 597       u_quotify(&d, argv[optind++]);
 598     dstr_putc(&d, '\n');
 599     errno = EIO;
 600     if (write(fd, d.buf, d.len) != d.len || shutdown(fd, 1))
 601       die(EXIT_FAILURE, "write failed: %s", strerror(errno));
 602     dstr_destroy(&d);
 603     f |= f_command;
 604   }
 605
 606   /* --- Pull everything else out of the box --- */
 607
 608   selbuf_init(&bs, &sel, fd, cline, 0);
 609
 610   if (f & f_syslog)
 611     openlog(QUIS, 0, LOG_DAEMON);
 612   if (logfp)
 613     sig_add(&hup, SIGHUP, sighup, 0);
 614   for (;;) {
 615     if (sel_select(&sel) && errno != EINTR && errno != EAGAIN)
 616       die(EXIT_FAILURE, "select failed: %s", strerror(errno));
 617   }
 618
 619   return (0);
 620 }
 621
 622 /*----- That's all, folks -------------------------------------------------*/