usr.bin/rdist/docmd.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)docmd.c  8.1 (Berkeley) 6/9/93
  34  * $FreeBSD: src/usr.bin/rdist/docmd.c,v 1.12 1999/08/28 01:05:06 peter Exp $
  35  * $DragonFly: src/usr.bin/rdist/docmd.c,v 1.5 2008/10/16 01:52:32 swildner Exp $
  36  */
  37
  38 #include <sys/types.h>
  39
  40 #include <netdb.h>
  41 #include <regex.h>
  42 #include <setjmp.h>
  43
  44 #include "defs.h"
  45
  46 FILE    *lfp;                   /* log file for recording files updated */
  47 struct  subcmd *subcmds;        /* list of sub-commands for current cmd */
  48 jmp_buf env;
  49
  50 static int       makeconn(char *);
  51 static int       okname(char *);
  52 static void      closeconn(void);
  53 static void      cmptime(char *);
  54 static void      doarrow(char **,
  55                     struct namelist *, char *, struct subcmd *);
  56 static void      dodcolon(char **,
  57                     struct namelist *, char *, struct subcmd *);
  58 static void      notify(char *, char *, struct namelist *, time_t);
  59 static void      rcmptime(struct stat *);
  60 static int       remotecmd(char *, char *, char *, char *);
  61
  62 /*
  63  * Do the commands in cmds (initialized by yyparse).
  64  */
  65 void
  66 docmds(char **dhosts, int argc, char **argv)
  67 {
  68         struct cmd *c;
  69         struct namelist *f;
  70         char **cpp;
  71         extern struct cmd *cmds;
  72
  73         signal(SIGHUP, cleanup);
  74         signal(SIGINT, cleanup);
  75         signal(SIGQUIT, cleanup);
  76         signal(SIGTERM, cleanup);
  77
  78         for (c = cmds; c != NULL; c = c->c_next) {
  79                 if (dhosts != NULL && *dhosts != NULL) {
  80                         for (cpp = dhosts; *cpp; cpp++)
  81                                 if (strcmp(c->c_name, *cpp) == 0)
  82                                         goto fndhost;
  83                         continue;
  84                 }
  85         fndhost:
  86                 if (argc) {
  87                         for (cpp = argv; *cpp; cpp++) {
  88                                 if (c->c_label != NULL &&
  89                                     strcmp(c->c_label, *cpp) == 0) {
  90                                         cpp = NULL;
  91                                         goto found;
  92                                 }
  93                                 for (f = c->c_files; f != NULL; f = f->n_next)
  94                                         if (strcmp(f->n_name, *cpp) == 0)
  95                                                 goto found;
  96                         }
  97                         continue;
  98                 } else
  99                         cpp = NULL;
 100         found:
 101                 switch (c->c_type) {
 102                 case ARROW:
 103                         doarrow(cpp, c->c_files, c->c_name, c->c_cmds);
 104                         break;
 105                 case DCOLON:
 106                         dodcolon(cpp, c->c_files, c->c_name, c->c_cmds);
 107                         break;
 108                 default:
 109                         fatal("illegal command type %d\n", c->c_type);
 110                 }
 111         }
 112         closeconn();
 113 }
 114
 115 /*
 116  * Process commands for sending files to other machines.
 117  */
 118 static void
 119 doarrow(char **filev, struct namelist *files, char *rhost, struct subcmd *cmds)
 120 {
 121         struct namelist *f;
 122         struct subcmd *sc;
 123         char **cpp;
 124         int n, ddir, opts = options;
 125
 126         if (debug)
 127                 printf("doarrow(%p, %s, %p)\n", files, rhost, cmds);
 128
 129         if (files == NULL) {
 130                 error("no files to be updated\n");
 131                 return;
 132         }
 133
 134         subcmds = cmds;
 135         ddir = files->n_next != NULL;   /* destination is a directory */
 136         if (nflag)
 137                 printf("updating host %s\n", rhost);
 138         else {
 139                 if (setjmp(env))
 140                         goto done;
 141                 signal(SIGPIPE, lostconn);
 142                 if (!makeconn(rhost))
 143                         return;
 144                 if ((lfp = fopen(tempfile, "w")) == NULL) {
 145                         fatal("cannot open %s\n", tempfile);
 146                         exit(1);
 147                 }
 148         }
 149         for (f = files; f != NULL; f = f->n_next) {
 150                 if (filev) {
 151                         for (cpp = filev; *cpp; cpp++)
 152                                 if (strcmp(f->n_name, *cpp) == 0)
 153                                         goto found;
 154                         if (!nflag)
 155                                 fclose(lfp);
 156                         continue;
 157                 }
 158         found:
 159                 n = 0;
 160                 for (sc = cmds; sc != NULL; sc = sc->sc_next) {
 161                         if (sc->sc_type != INSTALL)
 162                                 continue;
 163                         n++;
 164                         install(f->n_name, sc->sc_name,
 165                                 sc->sc_name == NULL ? 0 : ddir, sc->sc_options);
 166                         opts = sc->sc_options;
 167                 }
 168                 if (n == 0)
 169                         install(f->n_name, NULL, 0, options);
 170         }
 171 done:
 172         if (!nflag) {
 173                 signal(SIGPIPE, cleanup);
 174                 if (lfp)
 175                         fclose(lfp);
 176                 lfp = NULL;
 177         }
 178         for (sc = cmds; sc != NULL; sc = sc->sc_next)
 179                 if (sc->sc_type == NOTIFY)
 180                         notify(tempfile, rhost, sc->sc_args, 0);
 181         if (!nflag) {
 182                 struct linkbuf *nextihead;
 183
 184                 unlink(tempfile);
 185                 for (; ihead != NULL; ihead = nextihead) {
 186                         nextihead = ihead->nextp;
 187                         if ((opts & IGNLNKS) || ihead->count == 0)
 188                                 continue;
 189                         dolog(lfp, "%s: Warning: missing links\n",
 190                                 ihead->pathname);
 191                         free(ihead);
 192                 }
 193         }
 194 }
 195
 196 static int remotecmd(char *rhost, char *luser, char *ruser, char *cmd)
 197 {
 198         int desc;
 199         static int port = -1;
 200
 201         if (debug) {
 202                 printf("local user = %s remote user = %s\n", luser, ruser);
 203                 printf("Remote command = '%s'\n", cmd);
 204         }
 205
 206         fflush(stdout);
 207         fflush(stderr);
 208         signal(SIGALRM, cleanup);
 209         alarm(RTIMEOUT);
 210
 211         if (geteuid() == 0 && strcmp(path_rsh, _PATH_RSH) == 0) {
 212                 if (debug)
 213                         printf("I am root, therefore direct rcmd\n");
 214
 215                 signal(SIGPIPE, cleanup);
 216
 217                 if (port < 0) {
 218                         struct servent *sp;
 219
 220                         if ((sp = getservbyname("shell", "tcp")) == NULL)
 221                                 fatal("shell/tcp: unknown service");
 222                         port = sp->s_port;
 223                 }
 224
 225                 desc = rcmd(&rhost, port, luser, ruser, cmd, 0);
 226         } else {
 227                 if (debug)
 228                         printf("Remote shell command = '%s'\n", path_rsh);
 229                 signal(SIGPIPE, SIG_IGN);
 230                 desc = rshrcmd(&rhost, -1, luser, ruser, cmd, 0);
 231                 if (desc > 0)
 232                         signal(SIGPIPE, cleanup);
 233         }
 234
 235         alarm(0);
 236
 237         return(desc);
 238 }
 239
 240
 241 /*
 242  * Create a connection to the rdist server on the machine rhost.
 243  */
 244 static int
 245 makeconn(char *rhost)
 246 {
 247         char *ruser, *cp;
 248         static char *cur_host = NULL;
 249         static int port = -1;
 250         char tuser[20];
 251         int n;
 252         extern char user[];
 253 #if defined(DIRECT_RCMD)
 254         extern int userid;
 255 #endif
 256
 257         if (debug)
 258                 printf("makeconn(%s)\n", rhost);
 259
 260         if (cur_host != NULL && rem >= 0) {
 261                 if (strcmp(cur_host, rhost) == 0)
 262                         return(1);
 263                 closeconn();
 264         }
 265         cur_host = rhost;
 266         cp = index(rhost, '@');
 267         if (cp != NULL) {
 268                 char c = *cp;
 269
 270                 *cp = '\0';
 271                 strncpy(tuser, rhost, sizeof(tuser)-1);
 272                 *cp = c;
 273                 rhost = cp + 1;
 274                 ruser = tuser;
 275                 if (*ruser == '\0')
 276                         ruser = user;
 277                 else if (!okname(ruser))
 278                         return(0);
 279         } else
 280                 ruser = user;
 281         if (!qflag)
 282                 printf("updating host %s\n", rhost);
 283         snprintf(buf, sizeof(buf), "%s -Server%s", _PATH_RDIST, qflag ? " -q" : "");
 284         if (port < 0) {
 285                 struct servent *sp;
 286
 287                 if ((sp = getservbyname("shell", "tcp")) == NULL)
 288                         fatal("shell/tcp: unknown service");
 289                 port = sp->s_port;
 290         }
 291
 292         if (debug) {
 293                 printf("port = %d, luser = %s, ruser = %s\n", ntohs(port), user, ruser);
 294                 printf("buf = %s\n", buf);
 295         }
 296
 297         fflush(stdout);
 298 #if defined(DIRECT_RCMD)
 299         seteuid(0);
 300         rem = rcmd(&rhost, port, user, ruser, buf, 0);
 301         seteuid(userid);
 302 #else
 303         rem = remotecmd(rhost, user, ruser, buf);
 304 #endif
 305         if (rem < 0)
 306                 return(0);
 307         cp = buf;
 308         if (read(rem, cp, 1) != 1)
 309                 lostconn(0);
 310         if (*cp == 'V') {
 311                 do {
 312                         if (read(rem, cp, 1) != 1)
 313                                 lostconn(0);
 314                 } while (*cp++ != '\n' && cp < &buf[BUFSIZ]);
 315                 *--cp = '\0';
 316                 cp = buf;
 317                 n = 0;
 318                 while (*cp >= '0' && *cp <= '9')
 319                         n = (n * 10) + (*cp++ - '0');
 320                 if (*cp == '\0' && n == VERSION)
 321                         return(1);
 322                 error("connection failed: version numbers don't match (local %d, remote %d)\n", VERSION, n);
 323         } else {
 324                 error("connection failed: version numbers don't match\n");
 325                 error("got unexpected input:");
 326                 do {
 327                         error("%c", *cp);
 328                 } while (*cp != '\n' && read(rem, cp, 1) == 1);
 329         }
 330         closeconn();
 331         return(0);
 332 }
 333
 334 /*
 335  * Signal end of previous connection.
 336  */
 337 static void
 338 closeconn(void)
 339 {
 340         if (debug)
 341                 printf("closeconn()\n");
 342
 343         if (rem >= 0) {
 344                 write(rem, "\2\n", 2);
 345                 close(rem);
 346                 rem = -1;
 347         }
 348 }
 349
 350 void
 351 lostconn(int signo)
 352 {
 353         if (iamremote)
 354                 cleanup(0);
 355         dolog(lfp, "rdist: lost connection\n");
 356         longjmp(env, 1);
 357 }
 358
 359 static int
 360 okname(char *name)
 361 {
 362         char *cp;
 363         int c;
 364
 365         cp = name;
 366
 367         do {
 368                 c = *cp;
 369                 if (c & 0200)
 370                         goto bad;
 371                 if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
 372                         goto bad;
 373                 cp++;
 374         } while (*cp);
 375         return(1);
 376 bad:
 377         error("invalid user name %s\n", name);
 378         return(0);
 379 }
 380
 381 time_t  lastmod;
 382 FILE    *tfp;
 383 extern  char target[], *tp;
 384
 385 /*
 386  * Process commands for comparing files to time stamp files.
 387  */
 388 static void
 389 dodcolon(char **filev, struct namelist *files, char *stamp, struct subcmd *cmds)
 390 {
 391         struct subcmd *sc;
 392         struct namelist *f;
 393         char **cpp;
 394         struct timeval tv[2];
 395         struct timezone tz;
 396         struct stat stb;
 397
 398         if (debug)
 399                 printf("dodcolon()\n");
 400
 401         if (files == NULL) {
 402                 error("no files to be updated\n");
 403                 return;
 404         }
 405         if (stat(stamp, &stb) < 0) {
 406                 error("%s: %s\n", stamp, strerror(errno));
 407                 return;
 408         }
 409         if (debug)
 410                 printf("%s: %ld\n", stamp, stb.st_mtime);
 411
 412         subcmds = cmds;
 413         lastmod = stb.st_mtime;
 414         if (nflag || (options & VERIFY))
 415                 tfp = NULL;
 416         else {
 417                 if ((tfp = fopen(tempfile, "w")) == NULL) {
 418                         error("%s: %s\n", stamp, strerror(errno));
 419                         return;
 420                 }
 421                 gettimeofday(&tv[0], &tz);
 422                 tv[1] = tv[0];
 423                 utimes(stamp, tv);
 424         }
 425
 426         for (f = files; f != NULL; f = f->n_next) {
 427                 if (filev) {
 428                         for (cpp = filev; *cpp; cpp++)
 429                                 if (strcmp(f->n_name, *cpp) == 0)
 430                                         goto found;
 431                         continue;
 432                 }
 433         found:
 434                 tp = NULL;
 435                 cmptime(f->n_name);
 436         }
 437
 438         if (tfp != NULL)
 439                 fclose(tfp);
 440         for (sc = cmds; sc != NULL; sc = sc->sc_next)
 441                 if (sc->sc_type == NOTIFY)
 442                         notify(tempfile, NULL, sc->sc_args, lastmod);
 443         if (!nflag && !(options & VERIFY))
 444                 unlink(tempfile);
 445 }
 446
 447 /*
 448  * Compare the mtime of file to the list of time stamps.
 449  */
 450 static void
 451 cmptime(char *name)
 452 {
 453         struct stat stb;
 454
 455         if (debug)
 456                 printf("cmptime(%s)\n", name);
 457
 458         if (except(name))
 459                 return;
 460
 461         if (nflag) {
 462                 printf("comparing dates: %s\n", name);
 463                 return;
 464         }
 465
 466         /*
 467          * first time cmptime() is called?
 468          */
 469         if (tp == NULL) {
 470                 if (exptilde(target, name, sizeof(target)) == NULL)
 471                         return;
 472                 tp = name = target;
 473                 while (*tp)
 474                         tp++;
 475         }
 476         if (access(name, 4) < 0 || stat(name, &stb) < 0) {
 477                 error("%s: %s\n", name, strerror(errno));
 478                 return;
 479         }
 480
 481         switch (stb.st_mode & S_IFMT) {
 482         case S_IFREG:
 483                 break;
 484
 485         case S_IFDIR:
 486                 rcmptime(&stb);
 487                 return;
 488
 489         default:
 490                 error("%s: not a plain file\n", name);
 491                 return;
 492         }
 493
 494         if (stb.st_mtime > lastmod)
 495                 dolog(tfp, "new: %s\n", name);
 496 }
 497
 498 static void
 499 rcmptime(struct stat *st)
 500 {
 501         DIR *d;
 502         struct dirent *dp;
 503         char *cp;
 504         char *otp;
 505         int len;
 506
 507         if (debug)
 508                 printf("rcmptime(%p)\n", st);
 509
 510         if ((d = opendir(target)) == NULL) {
 511                 error("%s: %s\n", target, strerror(errno));
 512                 return;
 513         }
 514         otp = tp;
 515         len = tp - target;
 516         while ((dp = readdir(d))) {
 517                 if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
 518                         continue;
 519                 if (len + 1 + strlen(dp->d_name) >= BUFSIZ - 1) {
 520                         error("%s/%s: Name too long\n", target, dp->d_name);
 521                         continue;
 522                 }
 523                 tp = otp;
 524                 *tp++ = '/';
 525                 cp = dp->d_name;
 526                 while ((*tp++ = *cp++))
 527                         ;
 528                 tp--;
 529                 cmptime(target);
 530         }
 531         closedir(d);
 532         tp = otp;
 533         *tp = '\0';
 534 }
 535
 536 /*
 537  * Notify the list of people the changes that were made.
 538  * rhost == NULL if we are mailing a list of changes compared to at time
 539  * stamp file.
 540  */
 541 static void
 542 notify(char *file, char *rhost, struct namelist *to, time_t lmod)
 543 {
 544         int fd, len;
 545         struct stat stb;
 546         FILE *pf;
 547
 548         if ((options & VERIFY) || to == NULL)
 549                 return;
 550         if (!qflag) {
 551                 printf("notify ");
 552                 if (rhost)
 553                         printf("@%s ", rhost);
 554                 prnames(to);
 555         }
 556         if (nflag)
 557                 return;
 558
 559         if ((fd = open(file, 0)) < 0) {
 560                 error("%s: %s\n", file, strerror(errno));
 561                 return;
 562         }
 563         if (fstat(fd, &stb) < 0) {
 564                 error("%s: %s\n", file, strerror(errno));
 565                 close(fd);
 566                 return;
 567         }
 568         if (stb.st_size == 0) {
 569                 close(fd);
 570                 return;
 571         }
 572         /*
 573          * Create a pipe to mailling program.
 574          */
 575         snprintf(buf, sizeof(buf), "%s -oi -t", _PATH_SENDMAIL);
 576         pf = popen(buf, "w");
 577         if (pf == NULL) {
 578                 error("notify: \"%s\" failed\n", _PATH_SENDMAIL);
 579                 close(fd);
 580                 return;
 581         }
 582         /*
 583          * Output the proper header information.
 584          */
 585         fprintf(pf, "From: rdist (Remote distribution program)\n");
 586         fprintf(pf, "To:");
 587         if (!any('@', to->n_name) && rhost != NULL)
 588                 fprintf(pf, " %s@%s", to->n_name, rhost);
 589         else
 590                 fprintf(pf, " %s", to->n_name);
 591         to = to->n_next;
 592         while (to != NULL) {
 593                 if (!any('@', to->n_name) && rhost != NULL)
 594                         fprintf(pf, ", %s@%s", to->n_name, rhost);
 595                 else
 596                         fprintf(pf, ", %s", to->n_name);
 597                 to = to->n_next;
 598         }
 599         putc('\n', pf);
 600         if (rhost != NULL)
 601                 fprintf(pf, "Subject: files updated by rdist from %s to %s\n",
 602                         host, rhost);
 603         else
 604                 fprintf(pf, "Subject: files updated after %s\n", ctime(&lmod));
 605         putc('\n', pf);
 606
 607         while ((len = read(fd, buf, BUFSIZ)) > 0)
 608                 fwrite(buf, 1, len, pf);
 609
 610         close(fd);
 611         pclose(pf);
 612 }
 613
 614 /*
 615  * Return true if name is in the list.
 616  */
 617 int
 618 inlist(struct namelist *list, char *file)
 619 {
 620         struct namelist *nl;
 621
 622         for (nl = list; nl != NULL; nl = nl->n_next)
 623                 if (!strcmp(file, nl->n_name))
 624                         return(1);
 625         return(0);
 626 }
 627
 628 /*
 629  * Return TRUE if file is in the exception list.
 630  */
 631 int
 632 except(char *file)
 633 {
 634         struct  subcmd *sc;
 635         struct  namelist *nl;
 636         regex_t rx;
 637         int val;
 638
 639         if (debug)
 640                 printf("except(%s)\n", file);
 641
 642         for (sc = subcmds; sc != NULL; sc = sc->sc_next) {
 643                 if (sc->sc_type != EXCEPT && sc->sc_type != PATTERN)
 644                         continue;
 645                 for (nl = sc->sc_args; nl != NULL; nl = nl->n_next) {
 646                         if (sc->sc_type == EXCEPT) {
 647                                 if (!strcmp(file, nl->n_name))
 648                                         return(1);
 649                                 continue;
 650                         }
 651                         val = regcomp(&rx, nl->n_name,
 652                                       REG_EXTENDED | REG_NOSUB);
 653                         if (!regexec(&rx, file, 0, 0, 0)) {
 654                                 regfree(&rx);
 655                                 return 1;
 656                         }
 657                         regfree(&rx);
 658                 }
 659         }
 660         return(0);
 661 }
 662
 663 char *
 664 colon(char *cp)
 665 {
 666
 667         while (*cp) {
 668                 if (*cp == ':')
 669                         return(cp);
 670                 if (*cp == '/')
 671                         return(0);
 672                 cp++;
 673         }
 674         return(0);
 675 }