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 __FBSDID("$FreeBSD$"); 37 38 #include <errno.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <syslog.h> 43 #include <unistd.h> 44 #include <sys/types.h> 45 #include <sys/param.h> 46 #include <sys/socket.h> 47 #include <netinet/in.h> 48 #include <arpa/inet.h> 49 #include <rpc/rpc.h> 50 #include <rpc/clnt.h> 51 #include <rpcsvc/yp.h> 52 #include <rpcsvc/ypclnt.h> 53 #include <rpcsvc/ypxfrd.h> 54 #include "ypxfr_extern.h" 55 56 int debug = 1; 57 58 char *progname = "ypxfr"; 59 char *yp_dir = _PATH_YP; 60 int _rpcpmstart = 0; 61 static int ypxfr_use_yplib = 0; /* Assume the worst. */ 62 static int ypxfr_clear = 1; 63 static int ypxfr_prognum = 0; 64 static struct sockaddr_in ypxfr_callback_addr; 65 static struct yppushresp_xfr ypxfr_resp; 66 static DB *dbp; 67 68 static void 69 ypxfr_exit(ypxfrstat retval, char *temp) 70 { 71 CLIENT *clnt; 72 int sock = RPC_ANYSOCK; 73 struct timeval timeout; 74 75 /* Clean up no matter what happened previously. */ 76 if (temp != NULL) { 77 if (dbp != NULL) 78 (void)(dbp->close)(dbp); 79 if (unlink(temp) == -1) { 80 yp_error("failed to unlink %s",strerror(errno)); 81 } 82 } 83 84 if (ypxfr_prognum) { 85 timeout.tv_sec = 20; 86 timeout.tv_usec = 0; 87 88 if ((clnt = clntudp_create(&ypxfr_callback_addr, ypxfr_prognum, 89 1, timeout, &sock)) == NULL) { 90 yp_error("%s", clnt_spcreateerror("failed to " 91 "establish callback handle")); 92 exit(1); 93 } 94 95 ypxfr_resp.status = (yppush_status)retval; 96 97 if (yppushproc_xfrresp_1(&ypxfr_resp, clnt) == NULL) { 98 yp_error("%s", clnt_sperror(clnt, "callback failed")); 99 clnt_destroy(clnt); 100 exit(1); 101 } 102 clnt_destroy(clnt); 103 } else { 104 yp_error("Exiting: %s", ypxfrerr_string(retval)); 105 } 106 107 exit(0); 108 } 109 110 static void 111 usage(void) 112 { 113 if (_rpcpmstart) { 114 ypxfr_exit(YPXFR_BADARGS,NULL); 115 } else { 116 fprintf(stderr, "%s\n%s\n%s\n", 117 "usage: ypxfr [-f] [-c] [-d target domain] [-h source host]", 118 " [-s source domain] [-p path]", 119 " [-C taskid program-number ipaddr port] mapname"); 120 exit(1); 121 } 122 } 123 124 int 125 ypxfr_foreach(int status, char *key, int keylen, char *val, int vallen, 126 char *data) 127 { 128 DBT dbkey, dbval; 129 130 if (status != YP_TRUE) 131 return (status); 132 133 /* 134 * XXX Do not attempt to write zero-length keys or 135 * data into a Berkeley DB hash database. It causes a 136 * strange failure mode where sequential searches get 137 * caught in an infinite loop. 138 */ 139 if (keylen) { 140 dbkey.data = key; 141 dbkey.size = keylen; 142 } else { 143 dbkey.data = ""; 144 dbkey.size = 1; 145 } 146 if (vallen) { 147 dbval.data = val; 148 dbval.size = vallen; 149 } else { 150 dbval.data = ""; 151 dbval.size = 1; 152 } 153 154 if (yp_put_record(dbp, &dbkey, &dbval, 0) != YP_TRUE) 155 return(yp_errno); 156 157 return (0); 158 } 159 160 int 161 main(int argc, char *argv[]) 162 { 163 int ch; 164 int ypxfr_force = 0; 165 char *ypxfr_dest_domain = NULL; 166 char *ypxfr_source_host = NULL; 167 char *ypxfr_source_domain = NULL; 168 char *ypxfr_local_domain = NULL; 169 char *ypxfr_master = NULL; 170 unsigned long ypxfr_order = -1, ypxfr_skew_check = -1; 171 char *ypxfr_mapname = NULL; 172 int ypxfr_args = 0; 173 char ypxfr_temp_map[MAXPATHLEN + 2]; 174 char tempmap[MAXPATHLEN + 2]; 175 char buf[MAXPATHLEN + 2]; 176 DBT key, data; 177 int remoteport; 178 int interdom = 0; 179 int secure = 0; 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((ypxfrstat)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" : 364 ypxfrerr_string((ypxfrstat)yp_errno)); 365 ypxfr_exit(YPXFR_YPERR,NULL); 366 } 367 368 if (ypxfr_match(ypxfr_master, ypxfr_source_domain, ypxfr_mapname, 369 "YP_INTERDOMAIN", sizeof("YP_INTERDOMAIN") - 1)) 370 interdom++; 371 372 if (ypxfr_match(ypxfr_master, ypxfr_source_domain, ypxfr_mapname, 373 "YP_SECURE", sizeof("YP_SECURE") - 1)) 374 secure++; 375 376 key.data = "YP_LAST_MODIFIED"; 377 key.size = sizeof("YP_LAST_MODIFIED") - 1; 378 379 /* The order number is immaterial when the 'force' flag is set. */ 380 381 if (!ypxfr_force) { 382 int ignore = 0; 383 if (yp_get_record(ypxfr_dest_domain,ypxfr_mapname,&key,&data,1) != YP_TRUE) { 384 switch (yp_errno) { 385 case YP_NOKEY: 386 ypxfr_exit(YPXFR_FORCE,NULL); 387 break; 388 case YP_NOMAP: 389 /* 390 * If the map doesn't exist, we're 391 * creating it. Ignore the error. 392 */ 393 ignore++; 394 break; 395 case YP_BADDB: 396 default: 397 ypxfr_exit(YPXFR_DBM,NULL); 398 break; 399 } 400 } 401 if (!ignore && ypxfr_order <= atoi(data.data)) 402 ypxfr_exit(YPXFR_AGE, NULL); 403 404 } 405 406 /* Construct a temporary map file name */ 407 snprintf(tempmap, sizeof(tempmap), "%s.%d",ypxfr_mapname, getpid()); 408 snprintf(ypxfr_temp_map, sizeof(ypxfr_temp_map), "%s/%s/%s", yp_dir, 409 ypxfr_dest_domain, tempmap); 410 411 if ((remoteport = getrpcport(ypxfr_source_host, YPXFRD_FREEBSD_PROG, 412 YPXFRD_FREEBSD_VERS, IPPROTO_TCP))) { 413 414 /* Don't talk to rpc.ypxfrds on unprovileged ports. */ 415 if (remoteport >= IPPORT_RESERVED) { 416 yp_error("rpc.ypxfrd on %s not using privileged port", 417 ypxfr_source_host); 418 ypxfr_exit(YPXFR_REFUSED, NULL); 419 } 420 421 /* Try to send using ypxfrd. If it fails, use old method. */ 422 if (!ypxfrd_get_map(ypxfr_source_host, ypxfr_mapname, 423 ypxfr_source_domain, ypxfr_temp_map)) 424 goto leave; 425 } 426 427 /* Open the temporary map read/write. */ 428 if ((dbp = yp_open_db_rw(ypxfr_dest_domain, tempmap, 0)) == NULL) { 429 yp_error("failed to open temporary map file"); 430 ypxfr_exit(YPXFR_DBM,NULL); 431 } 432 433 /* 434 * Fill in the keys we already know, such as the order number, 435 * master name, input file name (we actually make up a bogus 436 * name for that) and output file name. 437 */ 438 snprintf(buf, sizeof(buf), "%lu", ypxfr_order); 439 data.data = buf; 440 data.size = strlen(buf); 441 442 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 443 yp_error("failed to write order number to database"); 444 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 445 } 446 447 key.data = "YP_MASTER_NAME"; 448 key.size = sizeof("YP_MASTER_NAME") - 1; 449 data.data = ypxfr_master; 450 data.size = strlen(ypxfr_master); 451 452 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 453 yp_error("failed to write master name to database"); 454 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 455 } 456 457 key.data = "YP_DOMAIN_NAME"; 458 key.size = sizeof("YP_DOMAIN_NAME") - 1; 459 data.data = ypxfr_dest_domain; 460 data.size = strlen(ypxfr_dest_domain); 461 462 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 463 yp_error("failed to write domain name to database"); 464 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 465 } 466 467 snprintf (buf, sizeof(buf), "%s:%s", ypxfr_source_host, ypxfr_mapname); 468 469 key.data = "YP_INPUT_NAME"; 470 key.size = sizeof("YP_INPUT_NAME") - 1; 471 data.data = &buf; 472 data.size = strlen(buf); 473 474 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 475 yp_error("failed to write input name to database"); 476 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 477 478 } 479 480 snprintf(buf, sizeof(buf), "%s/%s/%s", yp_dir, ypxfr_dest_domain, 481 ypxfr_mapname); 482 483 key.data = "YP_OUTPUT_NAME"; 484 key.size = sizeof("YP_OUTPUT_NAME") - 1; 485 data.data = &buf; 486 data.size = strlen(buf); 487 488 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 489 yp_error("failed to write output name to database"); 490 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 491 } 492 493 if (interdom) { 494 key.data = "YP_INTERDOMAIN"; 495 key.size = sizeof("YP_INTERDOMAIN") - 1; 496 data.data = ""; 497 data.size = 0; 498 499 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 500 yp_error("failed to add interdomain flag to database"); 501 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 502 } 503 } 504 505 if (secure) { 506 key.data = "YP_SECURE"; 507 key.size = sizeof("YP_SECURE") - 1; 508 data.data = ""; 509 data.size = 0; 510 511 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 512 yp_error("failed to add secure flag to database"); 513 ypxfr_exit(YPXFR_DBM,ypxfr_temp_map); 514 } 515 } 516 517 /* Now suck over the contents of the map from the master. */ 518 519 if (ypxfr_get_map(ypxfr_mapname,ypxfr_source_domain, 520 ypxfr_source_host, ypxfr_foreach)){ 521 yp_error("failed to retrieve map from source host"); 522 ypxfr_exit(YPXFR_YPERR,ypxfr_temp_map); 523 } 524 525 (void)(dbp->close)(dbp); 526 dbp = NULL; /* <- yes, it seems this is necessary. */ 527 528 leave: 529 530 snprintf(buf, sizeof(buf), "%s/%s/%s", yp_dir, ypxfr_dest_domain, 531 ypxfr_mapname); 532 533 /* Peek at the order number again and check for skew. */ 534 if ((ypxfr_skew_check = ypxfr_get_order(ypxfr_source_domain, 535 ypxfr_mapname, 536 ypxfr_master, 0)) == 0) { 537 yp_error("failed to get order number of %s: %s", 538 ypxfr_mapname, yp_errno == YP_TRUE ? 539 "map has order 0" : 540 ypxfrerr_string((ypxfrstat)yp_errno)); 541 ypxfr_exit(YPXFR_YPERR,ypxfr_temp_map); 542 } 543 544 if (ypxfr_order != ypxfr_skew_check) 545 ypxfr_exit(YPXFR_SKEW,ypxfr_temp_map); 546 547 /* 548 * Send a YPPROC_CLEAR to the local ypserv. 549 */ 550 if (ypxfr_clear) { 551 char in = 0; 552 char *out = NULL; 553 int stat; 554 if ((stat = callrpc("localhost",YPPROG,YPVERS,YPPROC_CLEAR, 555 (xdrproc_t)xdr_void, (void *)&in, 556 (xdrproc_t)xdr_void, (void *)out)) != RPC_SUCCESS) { 557 yp_error("failed to send 'clear' to local ypserv: %s", 558 clnt_sperrno((enum clnt_stat) stat)); 559 ypxfr_exit(YPXFR_CLEAR, ypxfr_temp_map); 560 } 561 } 562 563 /* 564 * Put the new map in place immediately. I'm not sure if the 565 * kernel does an unlink() and rename() atomically in the event 566 * that we move a new copy of a map over the top of an existing 567 * one, but there's less chance of a race condition happening 568 * than if we were to do the unlink() ourselves. 569 */ 570 if (rename(ypxfr_temp_map, buf) == -1) { 571 yp_error("rename(%s,%s) failed: %s", ypxfr_temp_map, buf, 572 strerror(errno)); 573 ypxfr_exit(YPXFR_FILE,NULL); 574 } 575 576 ypxfr_exit(YPXFR_SUCC,NULL); 577 578 return(1); 579 } 580