libexec/ypxfr/ypxfr_main.c

   1 /*
   2  * Copyright (c) 1995
   3  *      Bill Paul <wpaul@ctr.columbia.edu>.  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 Bill Paul.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/libexec/ypxfr/ypxfr_main.c,v 1.14.2.1 2002/02/15 00:46:54 des Exp $
  33  */
  34
  35 #include <errno.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <syslog.h>
  40 #include <unistd.h>
  41 #include <sys/types.h>
  42 #include <sys/param.h>
  43 #include <sys/socket.h>
  44 #include <netinet/in.h>
  45 #include <arpa/inet.h>
  46 #include <rpc/rpc.h>
  47 #include <rpc/clnt.h>
  48 #include <rpcsvc/yp.h>
  49 struct dom_binding {};
  50 #include <rpcsvc/ypclnt.h>
  51 #include <rpcsvc/ypxfrd.h>
  52 #include "ypxfr_extern.h"
  53
  54 int debug = 1;
  55
  56 const char *progname = "ypxfr";
  57 const char *yp_dir = _PATH_YP;
  58 int _rpcpmstart = 0;
  59 static int ypxfr_use_yplib = 0; /* Assume the worst. */
  60 static int ypxfr_clear = 1;
  61 static int ypxfr_prognum = 0;
  62 static struct sockaddr_in ypxfr_callback_addr;
  63 static struct yppushresp_xfr ypxfr_resp;
  64 static DB *dbp;
  65
  66 static void
  67 ypxfr_exit(ypxfrstat retval, char *temp)
  68 {
  69         CLIENT *clnt;
  70         int sock = RPC_ANYSOCK;
  71         struct timeval timeout;
  72
  73         /* Clean up no matter what happened previously. */
  74         if (temp != NULL) {
  75                 if (dbp != NULL)
  76                         (void)(dbp->close)(dbp);
  77                 if (unlink(temp) == -1) {
  78                         yp_error("failed to unlink %s",strerror(errno));
  79                 }
  80         }
  81
  82         if (ypxfr_prognum) {
  83                 timeout.tv_sec = 20;
  84                 timeout.tv_usec = 0;
  85
  86                 if ((clnt = clntudp_create(&ypxfr_callback_addr, ypxfr_prognum,
  87                                         1, timeout, &sock)) == NULL) {
  88                         yp_error("%s", clnt_spcreateerror("failed to "
  89                             "establish callback handle"));
  90                         exit(1);
  91                 }
  92
  93                 ypxfr_resp.status = retval;
  94
  95                 if (yppushproc_xfrresp_1(&ypxfr_resp, clnt) == NULL) {
  96                         yp_error("%s", clnt_sperror(clnt, "callback failed"));
  97                         clnt_destroy(clnt);
  98                         exit(1);
  99                 }
 100                 clnt_destroy(clnt);
 101         } else {
 102                 yp_error("Exiting: %s", ypxfrerr_string(retval));
 103         }
 104
 105         exit(0);
 106 }
 107
 108 static void
 109 usage(void)
 110 {
 111         if (_rpcpmstart) {
 112                 ypxfr_exit(YPXFR_BADARGS,NULL);
 113         } else {
 114                 fprintf(stderr, "%s\n%s\n%s\n",
 115         "usage: ypxfr [-f] [-c] [-d target domain] [-h source host]",
 116         "             [-s source domain] [-p path]",
 117         "             [-C taskid program-number ipaddr port] mapname");
 118                 exit(1);
 119         }
 120 }
 121
 122 static int
 123 ypxfr_foreach(int status, char *key, int keylen, char *val, int vallen,
 124     char *data __unused)
 125 {
 126         DBT dbkey, dbval;
 127
 128         if (status != YP_TRUE)
 129                 return (status);
 130
 131         /*
 132          * XXX Do not attempt to write zero-length keys or
 133          * data into a Berkeley DB hash database. It causes a
 134          * strange failure mode where sequential searches get
 135          * caught in an infinite loop.
 136          */
 137         if (keylen) {
 138                 dbkey.data = key;
 139                 dbkey.size = keylen;
 140         } else {
 141                 dbkey.data = "";
 142                 dbkey.size = 1;
 143         }
 144         if (vallen) {
 145                 dbval.data = val;
 146                 dbval.size = vallen;
 147         } else {
 148                 dbval.data = "";
 149                 dbval.size = 1;
 150         }
 151
 152         if (yp_put_record(dbp, &dbkey, &dbval, 0) != YP_TRUE)
 153                 return(yp_errno);
 154
 155         return (0);
 156 }
 157
 158 int
 159 main(int argc, char *argv[])
 160 {
 161         int ch;
 162         int ypxfr_force = 0;
 163         char *ypxfr_dest_domain = NULL;
 164         char *ypxfr_source_host = NULL;
 165         char *ypxfr_source_domain = NULL;
 166         char *ypxfr_local_domain = NULL;
 167         char *ypxfr_master = NULL;
 168         unsigned long ypxfr_order = -1, ypxfr_skew_check = -1;
 169         char *ypxfr_mapname = NULL;
 170         int ypxfr_args = 0;
 171         char ypxfr_temp_map[MAXPATHLEN + 2 + 3];
 172         char tempmap[MAXPATHLEN + 2];
 173         char buf[MAXPATHLEN + 2];
 174         DBT key, data;
 175         int remoteport;
 176         int interdom = 0;
 177         int secure = 0;
 178
 179         debug = 1;
 180
 181         if (!isatty(fileno(stderr))) {
 182                 openlog("ypxfr", LOG_PID, LOG_DAEMON);
 183                 _rpcpmstart = 1;
 184         }
 185
 186         if (argc < 2)
 187                 usage();
 188
 189         while ((ch = getopt(argc, argv, "fcd:h:s:p:C:")) != -1) {
 190                 int my_optind;
 191                 switch (ch) {
 192                 case 'f':
 193                         ypxfr_force++;
 194                         ypxfr_args++;
 195                         break;
 196                 case 'c':
 197                         ypxfr_clear = 0;
 198                         ypxfr_args++;
 199                         break;
 200                 case 'd':
 201                         ypxfr_dest_domain = optarg;
 202                         ypxfr_args += 2;
 203                         break;
 204                 case 'h':
 205                         ypxfr_source_host = optarg;
 206                         ypxfr_args += 2;
 207                         break;
 208                 case 's':
 209                         ypxfr_source_domain = optarg;
 210                         ypxfr_args += 2;
 211                         break;
 212                 case 'p':
 213                         yp_dir = optarg;
 214                         ypxfr_args += 2;
 215                         break;
 216                 case 'C':
 217                         /*
 218                          * Whoever decided that the -C flag should take
 219                          * four arguments is a twit.
 220                          */
 221                         my_optind = optind - 1;
 222                         if (argv[my_optind] == NULL || !strlen(argv[my_optind])) {
 223                                 yp_error("transaction ID not specified");
 224                                 usage();
 225                         }
 226                         ypxfr_resp.transid = atol(argv[my_optind]);
 227                         my_optind++;
 228                         if (argv[my_optind] == NULL || !strlen(argv[my_optind])) {
 229                                 yp_error("RPC program number not specified");
 230                                 usage();
 231                         }
 232                         ypxfr_prognum = atol(argv[my_optind]);
 233                         my_optind++;
 234                         if (argv[my_optind] == NULL || !strlen(argv[my_optind])) {
 235                                 yp_error("address not specified");
 236                                 usage();
 237                         }
 238                         if (!inet_aton(argv[my_optind], &ypxfr_callback_addr.sin_addr)) {
 239                                 yp_error("failed to convert '%s' to IP addr",
 240                                         argv[my_optind]);
 241                                 exit(1);
 242                         }
 243                         my_optind++;
 244                         if (argv[my_optind] == NULL || !strlen(argv[my_optind])) {
 245                                 yp_error("port not specified");
 246                                 usage();
 247                         }
 248                         ypxfr_callback_addr.sin_port = htons((u_short)atoi(argv[my_optind]));
 249                         ypxfr_args += 5;
 250                         break;
 251                 default:
 252                         usage();
 253                         break;
 254                 }
 255         }
 256
 257         ypxfr_mapname = argv[ypxfr_args + 1];
 258
 259         if (ypxfr_mapname == NULL) {
 260                 yp_error("no map name specified");
 261                 usage();
 262         }
 263
 264         /* Always the case. */
 265         ypxfr_callback_addr.sin_family = AF_INET;
 266
 267         /* Determine if local NIS client facilities are turned on. */
 268         if (!yp_get_default_domain(&ypxfr_local_domain) &&
 269             _yp_check(&ypxfr_local_domain))
 270                 ypxfr_use_yplib = 1;
 271
 272         /*
 273          * If no destination domain is specified, assume that the
 274          * local default domain is to be used and try to obtain it.
 275          * Fails if NIS client facilities are turned off.
 276          */
 277         if (ypxfr_dest_domain == NULL) {
 278                 if (ypxfr_use_yplib) {
 279                         yp_get_default_domain(&ypxfr_dest_domain);
 280                 } else {
 281                         yp_error("no destination domain specified and \
 282 the local domain name isn't set");
 283                         ypxfr_exit(YPXFR_BADARGS,NULL);
 284                 }
 285         }
 286
 287         /*
 288          * If a source domain is not specified, assume it to
 289          * be the same as the destination domain.
 290          */
 291         if (ypxfr_source_domain == NULL) {
 292                 ypxfr_source_domain = ypxfr_dest_domain;
 293         }
 294
 295         /*
 296          * If the source host is not specified, assume it to be the
 297          * master for the specified map. If local NIS client facilities
 298          * are turned on, we can figure this out using yp_master().
 299          * If not, we have to see if a local copy of the map exists
 300          * and extract its YP_MASTER_NAME record. If _that_ fails,
 301          * we are stuck and must ask the user for more information.
 302          */
 303         if (ypxfr_source_host == NULL) {
 304                 if (!ypxfr_use_yplib) {
 305                 /*
 306                  * Double whammy: NIS isn't turned on and the user
 307                  * didn't specify a source host.
 308                  */
 309                         char *dptr;
 310                         key.data = "YP_MASTER_NAME";
 311                         key.size = sizeof("YP_MASTER_NAME") - 1;
 312
 313                         if (yp_get_record(ypxfr_dest_domain, ypxfr_mapname,
 314                                          &key, &data, 1) != YP_TRUE) {
 315                                 yp_error("no source host specified");
 316                                 ypxfr_exit(YPXFR_BADARGS,NULL);
 317                         }
 318                         dptr = data.data;
 319                         dptr[data.size] = '\0';
 320                         ypxfr_master = ypxfr_source_host = strdup(dptr);
 321                 }
 322         } else {
 323                 if (ypxfr_use_yplib)
 324                         ypxfr_use_yplib = 0;
 325         }
 326
 327         if (ypxfr_master == NULL) {
 328                 if ((ypxfr_master = ypxfr_get_master(ypxfr_source_domain,
 329                                                  ypxfr_mapname,
 330                                                 ypxfr_source_host,
 331                                                 ypxfr_use_yplib)) == NULL) {
 332                         yp_error("failed to find master of %s in domain %s: %s",
 333                                   ypxfr_mapname, ypxfr_source_domain,
 334                                   ypxfrerr_string(yp_errno));
 335                         ypxfr_exit(YPXFR_MADDR,NULL);
 336                 }
 337         }
 338
 339         /*
 340          * If we got here and ypxfr_source_host is still undefined,
 341          * it means we had to resort to using yp_master() to find the
 342          * master server for the map. The source host and master should
 343          * be identical.
 344          */
 345         if (ypxfr_source_host == NULL)
 346                 ypxfr_source_host = ypxfr_master;
 347
 348         /*
 349          * Don't talk to ypservs on unprivileged ports.
 350          */
 351         remoteport = getrpcport(ypxfr_source_host, YPPROG, YPVERS, IPPROTO_UDP);
 352         if (remoteport >= IPPORT_RESERVED) {
 353                 yp_error("ypserv on %s not running on reserved port",
 354                                                 ypxfr_source_host);
 355                 ypxfr_exit(YPXFR_REFUSED, NULL);
 356         }
 357
 358         if ((ypxfr_order = ypxfr_get_order(ypxfr_source_domain,
 359                                              ypxfr_mapname,
 360                                              ypxfr_master, 0)) == 0) {
 361                 yp_error("failed to get order number of %s: %s",
 362                                 ypxfr_mapname, yp_errno == YP_TRUE ?
 363                                 "map has order 0" : ypxfrerr_string(yp_errno));
 364                 ypxfr_exit(YPXFR_YPERR,NULL);
 365         }
 366
 367         if (ypxfr_match(ypxfr_master, ypxfr_source_domain, ypxfr_mapname,
 368                         "YP_INTERDOMAIN", sizeof("YP_INTERDOMAIN") - 1))
 369                 interdom++;
 370
 371         if (ypxfr_match(ypxfr_master, ypxfr_source_domain, ypxfr_mapname,
 372                         "YP_SECURE", sizeof("YP_SECURE") - 1))
 373                 secure++;
 374
 375         key.data = "YP_LAST_MODIFIED";
 376         key.size = sizeof("YP_LAST_MODIFIED") - 1;
 377
 378         /* The order number is immaterial when the 'force' flag is set. */
 379
 380         if (!ypxfr_force) {
 381                 int ignore = 0;
 382                 if (yp_get_record(ypxfr_dest_domain,ypxfr_mapname,&key,&data,1) != YP_TRUE) {
 383                         switch (yp_errno) {
 384                         case YP_NOKEY:
 385                                 ypxfr_exit(YPXFR_FORCE,NULL);
 386                                 break;
 387                         case YP_NOMAP:
 388                                 /*
 389                                  * If the map doesn't exist, we're
 390                                  * creating it. Ignore the error.
 391                                  */
 392                                 ignore++;
 393                                 break;
 394                         case YP_BADDB:
 395                         default:
 396                                 ypxfr_exit(YPXFR_DBM,NULL);
 397                                 break;
 398                         }
 399                 }
 400                 if (!ignore && ypxfr_order <= (unsigned)atoi(data.data))
 401                         ypxfr_exit(YPXFR_AGE, NULL);
 402
 403         }
 404
 405         /* Construct a temporary map file name */
 406         snprintf(tempmap, sizeof(tempmap), "%s.%d",ypxfr_mapname, getpid());
 407         snprintf(ypxfr_temp_map, sizeof(ypxfr_temp_map), "%s/%s/%s", yp_dir,
 408                  ypxfr_dest_domain, tempmap);
 409
 410         if ((remoteport = getrpcport(ypxfr_source_host, YPXFRD_FREEBSD_PROG,
 411                                         YPXFRD_FREEBSD_VERS, IPPROTO_TCP))) {
 412
 413                 /* Don't talk to rpc.ypxfrds on unprovileged ports. */
 414                 if (remoteport >= IPPORT_RESERVED) {
 415                         yp_error("rpc.ypxfrd on %s not using privileged port",
 416                                                         ypxfr_source_host);
 417                         ypxfr_exit(YPXFR_REFUSED, NULL);
 418                 }
 419
 420                 /* Try to send using ypxfrd. If it fails, use old method. */
 421                 if (!ypxfrd_get_map(ypxfr_source_host, ypxfr_mapname,
 422                                         ypxfr_source_domain, ypxfr_temp_map))
 423                         goto leave;
 424         }
 425
 426         /* Open the temporary map read/write. */
 427         if ((dbp = yp_open_db_rw(ypxfr_dest_domain, tempmap, 0)) == NULL) {
 428                 yp_error("failed to open temporary map file");
 429                 ypxfr_exit(YPXFR_DBM,NULL);
 430         }
 431
 432         /*
 433          * Fill in the keys we already know, such as the order number,
 434          * master name, input file name (we actually make up a bogus
 435          * name for that) and output file name.
 436          */
 437         snprintf(buf, sizeof(buf), "%lu", ypxfr_order);
 438         data.data = buf;
 439         data.size = strlen(buf);
 440
 441         if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
 442                 yp_error("failed to write order number to database");
 443                 ypxfr_exit(YPXFR_DBM, ypxfr_temp_map);
 444         }
 445
 446         key.data = "YP_MASTER_NAME";
 447         key.size = sizeof("YP_MASTER_NAME") - 1;
 448         data.data = ypxfr_master;
 449         data.size = strlen(ypxfr_master);
 450
 451         if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
 452                 yp_error("failed to write master name to database");
 453                 ypxfr_exit(YPXFR_DBM, ypxfr_temp_map);
 454         }
 455
 456         key.data = "YP_DOMAIN_NAME";
 457         key.size = sizeof("YP_DOMAIN_NAME") - 1;
 458         data.data = ypxfr_dest_domain;
 459         data.size = strlen(ypxfr_dest_domain);
 460
 461         if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
 462                 yp_error("failed to write domain name to database");
 463                 ypxfr_exit(YPXFR_DBM, ypxfr_temp_map);
 464         }
 465
 466         snprintf (buf, sizeof(buf), "%s:%s", ypxfr_source_host, ypxfr_mapname);
 467
 468         key.data = "YP_INPUT_NAME";
 469         key.size = sizeof("YP_INPUT_NAME") - 1;
 470         data.data = &buf;
 471         data.size = strlen(buf);
 472
 473         if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
 474                 yp_error("failed to write input name to database");
 475                 ypxfr_exit(YPXFR_DBM, ypxfr_temp_map);
 476
 477         }
 478
 479         snprintf(buf, sizeof(buf), "%s/%s/%s", yp_dir, ypxfr_dest_domain,
 480                                                         ypxfr_mapname);
 481
 482         key.data = "YP_OUTPUT_NAME";
 483         key.size = sizeof("YP_OUTPUT_NAME") - 1;
 484         data.data = &buf;
 485         data.size = strlen(buf);
 486
 487         if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
 488                 yp_error("failed to write output name to database");
 489                 ypxfr_exit(YPXFR_DBM, ypxfr_temp_map);
 490         }
 491
 492         if (interdom) {
 493                 key.data = "YP_INTERDOMAIN";
 494                 key.size = sizeof("YP_INTERDOMAIN") - 1;
 495                 data.data = "";
 496                 data.size = 0;
 497
 498                 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
 499                         yp_error("failed to add interdomain flag to database");
 500                         ypxfr_exit(YPXFR_DBM, ypxfr_temp_map);
 501                 }
 502         }
 503
 504         if (secure) {
 505                 key.data = "YP_SECURE";
 506                 key.size = sizeof("YP_SECURE") - 1;
 507                 data.data = "";
 508                 data.size = 0;
 509
 510                 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) {
 511                         yp_error("failed to add secure flag to database");
 512                         ypxfr_exit(YPXFR_DBM, ypxfr_temp_map);
 513                 }
 514         }
 515
 516         /* Now suck over the contents of the map from the master. */
 517
 518         if (ypxfr_get_map(ypxfr_mapname,ypxfr_source_domain,
 519                           ypxfr_source_host, ypxfr_foreach)){
 520                 yp_error("failed to retrieve map from source host");
 521                 ypxfr_exit(YPXFR_YPERR, ypxfr_temp_map);
 522         }
 523
 524         (void)(dbp->close)(dbp);
 525         dbp = NULL; /* <- yes, it seems this is necessary. */
 526
 527 leave:
 528
 529         snprintf(buf, sizeof(buf), "%s/%s/%s", yp_dir, ypxfr_dest_domain,
 530                                                         ypxfr_mapname);
 531
 532         /* Peek at the order number again and check for skew. */
 533         if ((ypxfr_skew_check = ypxfr_get_order(ypxfr_source_domain,
 534                                              ypxfr_mapname,
 535                                              ypxfr_master, 0)) == 0) {
 536                 yp_error("failed to get order number of %s: %s",
 537                                 ypxfr_mapname, yp_errno == YP_TRUE ?
 538                                 "map has order 0" : ypxfrerr_string(yp_errno));
 539                 ypxfr_exit(YPXFR_YPERR, ypxfr_temp_map);
 540         }
 541
 542         if (ypxfr_order != ypxfr_skew_check)
 543                 ypxfr_exit(YPXFR_SKEW, ypxfr_temp_map);
 544
 545         /*
 546          * Send a YPPROC_CLEAR to the local ypserv.
 547          */
 548         if (ypxfr_clear) {
 549                 char in = 0;
 550                 char *out = NULL;
 551                 int stat;
 552                 if ((stat = callrpc("localhost",YPPROG,YPVERS,YPPROC_CLEAR,
 553                         (xdrproc_t)xdr_void, (void *)&in,
 554                         (xdrproc_t)xdr_void, (void *)out)) != RPC_SUCCESS) {
 555                         yp_error("failed to send 'clear' to local ypserv: %s",
 556                                  clnt_sperrno((enum clnt_stat) stat));
 557                         ypxfr_exit(YPXFR_CLEAR, ypxfr_temp_map);
 558                 }
 559         }
 560
 561         /*
 562          * Put the new map in place immediately. I'm not sure if the
 563          * kernel does an unlink() and rename() atomically in the event
 564          * that we move a new copy of a map over the top of an existing
 565          * one, but there's less chance of a race condition happening
 566          * than if we were to do the unlink() ourselves.
 567          */
 568         if (rename(ypxfr_temp_map, buf) == -1) {
 569                 yp_error("rename(%s,%s) failed: %s", ypxfr_temp_map, buf,
 570                                                         strerror(errno));
 571                 ypxfr_exit(YPXFR_FILE,NULL);
 572         }
 573
 574         ypxfr_exit(YPXFR_SUCC,NULL);
 575
 576         return(1);
 577 }