1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1995 5 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Bill Paul. 18 * 4. Neither the name of the author nor the names of any co-contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #include <errno.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <syslog.h> 41 #include <unistd.h> 42 #include <sys/types.h> 43 #include <sys/param.h> 44 #include <sys/socket.h> 45 #include <netinet/in.h> 46 #include <arpa/inet.h> 47 #include <rpc/rpc.h> 48 #include <rpc/clnt.h> 49 #include <rpcsvc/yp.h> 50 #include <rpcsvc/ypclnt.h> 51 #include <rpcsvc/ypxfrd.h> 52 #include "ypxfr_extern.h" 53 54 int debug = 1; 55 56 char *progname = "ypxfr"; 57 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 = (yppush_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 int 123 ypxfr_foreach(int status, char *key, int keylen, char *val, int vallen, 124 char *data) 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]; 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 if (!isatty(fileno(stderr))) { 180 openlog("ypxfr", LOG_PID, LOG_DAEMON); 181 _rpcpmstart = 1; 182 } 183 184 if (argc < 2) 185 usage(); 186 187 while ((ch = getopt(argc, argv, "fcd:h:s:p:C:")) != -1) { 188 int my_optind; 189 switch (ch) { 190 case 'f': 191 ypxfr_force++; 192 ypxfr_args++; 193 break; 194 case 'c': 195 ypxfr_clear = 0; 196 ypxfr_args++; 197 break; 198 case 'd': 199 ypxfr_dest_domain = optarg; 200 ypxfr_args += 2; 201 break; 202 case 'h': 203 ypxfr_source_host = optarg; 204 ypxfr_args += 2; 205 break; 206 case 's': 207 ypxfr_source_domain = optarg; 208 ypxfr_args += 2; 209 break; 210 case 'p': 211 yp_dir = optarg; 212 ypxfr_args += 2; 213 break; 214 case 'C': 215 /* 216 * Whoever decided that the -C flag should take 217 * four arguments is a twit. 218 */ 219 my_optind = optind - 1; 220 if (argv[my_optind] == NULL || !strlen(argv[my_optind])) { 221 yp_error("transaction ID not specified"); 222 usage(); 223 } 224 ypxfr_resp.transid = atol(argv[my_optind]); 225 my_optind++; 226 if (argv[my_optind] == NULL || !strlen(argv[my_optind])) { 227 yp_error("RPC program number not specified"); 228 usage(); 229 } 230 ypxfr_prognum = atol(argv[my_optind]); 231 my_optind++; 232 if (argv[my_optind] == NULL || !strlen(argv[my_optind])) { 233 yp_error("address not specified"); 234 usage(); 235 } 236 if (!inet_aton(argv[my_optind], &ypxfr_callback_addr.sin_addr)) { 237 yp_error("failed to convert '%s' to IP addr", 238 argv[my_optind]); 239 exit(1); 240 } 241 my_optind++; 242 if (argv[my_optind] == NULL || !strlen(argv[my_optind])) { 243 yp_error("port not specified"); 244 usage(); 245 } 246 ypxfr_callback_addr.sin_port = htons((u_short)atoi(argv[my_optind])); 247 ypxfr_args += 5; 248 break; 249 default: 250 usage(); 251 break; 252 } 253 } 254 255 ypxfr_mapname = argv[ypxfr_args + 1]; 256 257 if (ypxfr_mapname == NULL) { 258 yp_error("no map name specified"); 259 usage(); 260 } 261 262 /* Always the case. */ 263 ypxfr_callback_addr.sin_family = AF_INET; 264 265 /* Determine if local NIS client facilities are turned on. */ 266 if (!yp_get_default_domain(&ypxfr_local_domain) && 267 _yp_check(&ypxfr_local_domain)) 268 ypxfr_use_yplib = 1; 269 270 /* 271 * If no destination domain is specified, assume that the 272 * local default domain is to be used and try to obtain it. 273 * Fails if NIS client facilities are turned off. 274 */ 275 if (ypxfr_dest_domain == NULL) { 276 if (ypxfr_use_yplib) { 277 yp_get_default_domain(&ypxfr_dest_domain); 278 } else { 279 yp_error("no destination domain specified and \ 280 the local domain name isn't set"); 281 ypxfr_exit(YPXFR_BADARGS,NULL); 282 } 283 } 284 285 /* 286 * If a source domain is not specified, assume it to 287 * be the same as the destination domain. 288 */ 289 if (ypxfr_source_domain == NULL) { 290 ypxfr_source_domain = ypxfr_dest_domain; 291 } 292 293 /* 294 * If the source host is not specified, assume it to be the 295 * master for the specified map. If local NIS client facilities 296 * are turned on, we can figure this out using yp_master(). 297 * If not, we have to see if a local copy of the map exists 298 * and extract its YP_MASTER_NAME record. If _that_ fails, 299 * we are stuck and must ask the user for more information. 300 */ 301 if (ypxfr_source_host == NULL) { 302 if (!ypxfr_use_yplib) { 303 /* 304 * Double whammy: NIS isn't turned on and the user 305 * didn't specify a source host. 306 */ 307 char *dptr; 308 key.data = "YP_MASTER_NAME"; 309 key.size = sizeof("YP_MASTER_NAME") - 1; 310 311 if (yp_get_record(ypxfr_dest_domain, ypxfr_mapname, 312 &key, &data, 1) != YP_TRUE) { 313 yp_error("no source host specified"); 314 ypxfr_exit(YPXFR_BADARGS,NULL); 315 } 316 dptr = data.data; 317 dptr[data.size] = '\0'; 318 ypxfr_master = ypxfr_source_host = strdup(dptr); 319 } 320 } else { 321 if (ypxfr_use_yplib) 322 ypxfr_use_yplib = 0; 323 } 324 325 if (ypxfr_master == NULL) { 326 if ((ypxfr_master = ypxfr_get_master(ypxfr_source_domain, 327 ypxfr_mapname, 328 ypxfr_source_host, 329 ypxfr_use_yplib)) == NULL) { 330 yp_error("failed to find master of %s in domain %s: %s", 331 ypxfr_mapname, ypxfr_source_domain, 332 ypxfrerr_string((ypxfrstat)yp_errno)); 333 ypxfr_exit(YPXFR_MADDR,NULL); 334 } 335 } 336 337 /* 338 * If we got here and ypxfr_source_host is still undefined, 339 * it means we had to resort to using yp_master() to find the 340 * master server for the map. The source host and master should 341 * be identical. 342 */ 343 if (ypxfr_source_host == NULL) 344 ypxfr_source_host = ypxfr_master; 345 346 /* 347 * Don't talk to ypservs on unprivileged ports. 348 */ 349 remoteport = getrpcport(ypxfr_source_host, YPPROG, YPVERS, IPPROTO_UDP); 350 if (remoteport >= IPPORT_RESERVED) { 351 yp_error("ypserv on %s not running on reserved port", 352 ypxfr_source_host); 353 ypxfr_exit(YPXFR_REFUSED, NULL); 354 } 355 356 if ((ypxfr_order = ypxfr_get_order(ypxfr_source_domain, 357 ypxfr_mapname, 358 ypxfr_master, 0)) == 0) { 359 yp_error("failed to get order number of %s: %s", 360 ypxfr_mapname, yp_errno == YP_TRUE ? 361 "map has order 0" : 362 ypxfrerr_string((ypxfrstat)yp_errno)); 363 ypxfr_exit(YPXFR_YPERR,NULL); 364 } 365 366 if (ypxfr_match(ypxfr_master, ypxfr_source_domain, ypxfr_mapname, 367 "YP_INTERDOMAIN", sizeof("YP_INTERDOMAIN") - 1)) 368 interdom++; 369 370 if (ypxfr_match(ypxfr_master, ypxfr_source_domain, ypxfr_mapname, 371 "YP_SECURE", sizeof("YP_SECURE") - 1)) 372 secure++; 373 374 key.data = "YP_LAST_MODIFIED"; 375 key.size = sizeof("YP_LAST_MODIFIED") - 1; 376 377 /* The order number is immaterial when the 'force' flag is set. */ 378 379 if (!ypxfr_force) { 380 int ignore = 0; 381 if (yp_get_record(ypxfr_dest_domain,ypxfr_mapname,&key,&data,1) != YP_TRUE) { 382 switch (yp_errno) { 383 case YP_NOKEY: 384 ypxfr_exit(YPXFR_FORCE,NULL); 385 break; 386 case YP_NOMAP: 387 /* 388 * If the map doesn't exist, we're 389 * creating it. Ignore the error. 390 */ 391 ignore++; 392 break; 393 case YP_BADDB: 394 default: 395 ypxfr_exit(YPXFR_DBM,NULL); 396 break; 397 } 398 } 399 if (!ignore && ypxfr_order <= atoi(data.data)) 400 ypxfr_exit(YPXFR_AGE, NULL); 401 402 } 403 404 /* Construct a temporary map file name */ 405 snprintf(tempmap, sizeof(tempmap), "%s.%d",ypxfr_mapname, getpid()); 406 snprintf(ypxfr_temp_map, sizeof(ypxfr_temp_map), "%s/%s/%s", yp_dir, 407 ypxfr_dest_domain, tempmap); 408 409 if ((remoteport = getrpcport(ypxfr_source_host, YPXFRD_FREEBSD_PROG, 410 YPXFRD_FREEBSD_VERS, IPPROTO_TCP))) { 411 412 /* Don't talk to rpc.ypxfrds on unprovileged ports. */ 413 if (remoteport >= IPPORT_RESERVED) { 414 yp_error("rpc.ypxfrd on %s not using privileged port", 415 ypxfr_source_host); 416 ypxfr_exit(YPXFR_REFUSED, NULL); 417 } 418 419 /* Try to send using ypxfrd. If it fails, use old method. */ 420 if (!ypxfrd_get_map(ypxfr_source_host, ypxfr_mapname, 421 ypxfr_source_domain, ypxfr_temp_map)) 422 goto leave; 423 } 424 425 /* Open the temporary map read/write. */ 426 if ((dbp = yp_open_db_rw(ypxfr_dest_domain, tempmap, 0)) == NULL) { 427 yp_error("failed to open temporary map file"); 428 ypxfr_exit(YPXFR_DBM,NULL); 429 } 430 431 /* 432 * Fill in the keys we already know, such as the order number, 433 * master name, input file name (we actually make up a bogus 434 * name for that) and output file name. 435 */ 436 snprintf(buf, sizeof(buf), "%lu", ypxfr_order); 437 data.data = buf; 438 data.size = strlen(buf); 439 440 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 441 yp_error("failed to write order number to database"); 442 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 443 } 444 445 key.data = "YP_MASTER_NAME"; 446 key.size = sizeof("YP_MASTER_NAME") - 1; 447 data.data = ypxfr_master; 448 data.size = strlen(ypxfr_master); 449 450 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 451 yp_error("failed to write master name to database"); 452 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 453 } 454 455 key.data = "YP_DOMAIN_NAME"; 456 key.size = sizeof("YP_DOMAIN_NAME") - 1; 457 data.data = ypxfr_dest_domain; 458 data.size = strlen(ypxfr_dest_domain); 459 460 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 461 yp_error("failed to write domain name to database"); 462 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 463 } 464 465 snprintf (buf, sizeof(buf), "%s:%s", ypxfr_source_host, ypxfr_mapname); 466 467 key.data = "YP_INPUT_NAME"; 468 key.size = sizeof("YP_INPUT_NAME") - 1; 469 data.data = &buf; 470 data.size = strlen(buf); 471 472 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 473 yp_error("failed to write input name to database"); 474 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 475 476 } 477 478 snprintf(buf, sizeof(buf), "%s/%s/%s", yp_dir, ypxfr_dest_domain, 479 ypxfr_mapname); 480 481 key.data = "YP_OUTPUT_NAME"; 482 key.size = sizeof("YP_OUTPUT_NAME") - 1; 483 data.data = &buf; 484 data.size = strlen(buf); 485 486 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 487 yp_error("failed to write output name to database"); 488 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 489 } 490 491 if (interdom) { 492 key.data = "YP_INTERDOMAIN"; 493 key.size = sizeof("YP_INTERDOMAIN") - 1; 494 data.data = ""; 495 data.size = 0; 496 497 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 498 yp_error("failed to add interdomain flag to database"); 499 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 500 } 501 } 502 503 if (secure) { 504 key.data = "YP_SECURE"; 505 key.size = sizeof("YP_SECURE") - 1; 506 data.data = ""; 507 data.size = 0; 508 509 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 510 yp_error("failed to add secure flag to database"); 511 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 512 } 513 } 514 515 /* Now suck over the contents of the map from the master. */ 516 517 if (ypxfr_get_map(ypxfr_mapname,ypxfr_source_domain, 518 ypxfr_source_host, ypxfr_foreach)){ 519 yp_error("failed to retrieve map from source host"); 520 ypxfr_exit(YPXFR_YPERR,ypxfr_temp_map); 521 } 522 523 (void)(dbp->close)(dbp); 524 dbp = NULL; /* <- yes, it seems this is necessary. */ 525 526 leave: 527 528 snprintf(buf, sizeof(buf), "%s/%s/%s", yp_dir, ypxfr_dest_domain, 529 ypxfr_mapname); 530 531 /* Peek at the order number again and check for skew. */ 532 if ((ypxfr_skew_check = ypxfr_get_order(ypxfr_source_domain, 533 ypxfr_mapname, 534 ypxfr_master, 0)) == 0) { 535 yp_error("failed to get order number of %s: %s", 536 ypxfr_mapname, yp_errno == YP_TRUE ? 537 "map has order 0" : 538 ypxfrerr_string((ypxfrstat)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 } 578