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 * $Id: ypxfr_main.c,v 1.17 1996/06/03 03:11:39 wpaul Exp $ 33 */ 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <unistd.h> 37 #include <string.h> 38 #include <syslog.h> 39 #include <errno.h> 40 #include <sys/types.h> 41 #include <sys/param.h> 42 #include <sys/socket.h> 43 #include <netinet/in.h> 44 #include <arpa/inet.h> 45 #include <rpc/rpc.h> 46 #include <rpc/clnt.h> 47 #include <rpcsvc/yp.h> 48 struct dom_binding {}; 49 #include <rpcsvc/ypclnt.h> 50 #include <rpcsvc/ypxfrd.h> 51 #include "ypxfr_extern.h" 52 53 #ifndef lint 54 static const char rcsid[] = "$Id: ypxfr_main.c,v 1.17 1996/06/03 03:11:39 wpaul Exp $"; 55 #endif 56 57 char *progname = "ypxfr"; 58 char *yp_dir = _PATH_YP; 59 int _rpcpmstart = 0; 60 int ypxfr_use_yplib = 0; /* Assume the worst. */ 61 int ypxfr_clear = 1; 62 int ypxfr_prognum = 0; 63 struct sockaddr_in ypxfr_callback_addr; 64 struct yppushresp_xfr ypxfr_resp; 65 DB *dbp; 66 67 static void ypxfr_exit(retval, temp) 68 ypxfrstat retval; 69 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 (_rpcpmstart) { 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 = 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 usage() 111 { 112 if (_rpcpmstart) { 113 ypxfr_exit(YPXFR_BADARGS,NULL); 114 } else { 115 fprintf(stderr,"usage: %s [-f] [-c] [-d target domain] \ 116 [-h source host] [-s source domain]\n", progname); 117 fprintf(stderr,"\t [-p path] [-C taskid program-number \ 118 ipaddr port] mapname\n"); 119 exit(1); 120 } 121 } 122 123 int ypxfr_foreach(status, key, keylen, val, vallen, data) 124 int status; 125 char *key; 126 int keylen; 127 char *val; 128 int vallen; 129 char *data; 130 { 131 DBT dbkey, dbval; 132 133 if (status != YP_TRUE) 134 return (status); 135 136 dbkey.data = key; 137 dbkey.size = keylen; 138 dbval.data = val; 139 dbval.size = vallen; 140 141 if (yp_put_record(dbp, &dbkey, &dbval, 0) != YP_TRUE) 142 return(yp_errno); 143 144 return (0); 145 } 146 147 main(argc,argv) 148 int argc; 149 char *argv[]; 150 { 151 int ch; 152 int ypxfr_force = 0; 153 char *ypxfr_dest_domain = NULL; 154 char *ypxfr_source_host = NULL; 155 char *ypxfr_source_domain = NULL; 156 char *ypxfr_local_domain = NULL; 157 char *ypxfr_master = NULL; 158 unsigned long ypxfr_order = -1, ypxfr_skew_check = -1; 159 char *ypxfr_mapname = NULL; 160 int ypxfr_args = 0; 161 char ypxfr_temp_map[MAXPATHLEN + 2]; 162 char tempmap[MAXPATHLEN + 2]; 163 char buf[MAXPATHLEN + 2]; 164 DBT key, data; 165 166 debug = 1; 167 168 if (!isatty(fileno(stderr))) { 169 openlog(progname, LOG_PID, LOG_DAEMON); 170 _rpcpmstart = 1; 171 } 172 173 if (argc < 2) 174 usage(); 175 176 while ((ch = getopt(argc, argv, "fcd:h:s:p:C:")) != EOF) { 177 int my_optind; 178 switch(ch) { 179 case 'f': 180 ypxfr_force++; 181 ypxfr_args++; 182 break; 183 case 'c': 184 ypxfr_clear = 0; 185 ypxfr_args++; 186 break; 187 case 'd': 188 ypxfr_dest_domain = optarg; 189 ypxfr_args += 2; 190 break; 191 case 'h': 192 ypxfr_source_host = optarg; 193 ypxfr_args += 2; 194 break; 195 case 's': 196 ypxfr_source_domain = optarg; 197 ypxfr_args += 2; 198 break; 199 case 'p': 200 yp_dir = optarg; 201 ypxfr_args += 2; 202 break; 203 case 'C': 204 /* 205 * Whoever decided that the -C flag should take 206 * four arguments is a twit. 207 */ 208 my_optind = optind - 1; 209 if (argv[my_optind] == NULL || !strlen(argv[my_optind])) { 210 yp_error("transaction ID not specified"); 211 usage(); 212 } 213 ypxfr_resp.transid = atol(argv[my_optind]); 214 my_optind++; 215 if (argv[my_optind] == NULL || !strlen(argv[my_optind])) { 216 yp_error("RPC program number not specified"); 217 usage(); 218 } 219 ypxfr_prognum = atol(argv[my_optind]); 220 my_optind++; 221 if (argv[my_optind] == NULL || !strlen(argv[my_optind])) { 222 yp_error("address not specified"); 223 usage(); 224 } 225 if (!inet_aton(argv[my_optind], &ypxfr_callback_addr.sin_addr)) { 226 yp_error("failed to convert '%s' to IP addr", 227 argv[my_optind]); 228 exit(1); 229 } 230 my_optind++; 231 if (argv[my_optind] == NULL || !strlen(argv[my_optind])) { 232 yp_error("port not specified"); 233 usage(); 234 } 235 ypxfr_callback_addr.sin_port = htons((u_short)atoi(argv[my_optind])); 236 ypxfr_args += 5; 237 break; 238 default: 239 usage(); 240 break; 241 } 242 } 243 244 ypxfr_mapname = argv[ypxfr_args + 1]; 245 246 if (ypxfr_mapname == NULL) { 247 yp_error("no map name specified"); 248 usage(); 249 } 250 251 /* Always the case. */ 252 ypxfr_callback_addr.sin_family = AF_INET; 253 254 /* Determine if local NIS client facilities are turned on. */ 255 if (!yp_get_default_domain(&ypxfr_local_domain) && 256 _yp_check(&ypxfr_local_domain)) 257 ypxfr_use_yplib = 1; 258 259 /* 260 * If no destination domain is specified, assume that the 261 * local default domain is to be used and try to obtain it. 262 * Fails if NIS client facilities are turned off. 263 */ 264 if (ypxfr_dest_domain == NULL) { 265 if (ypxfr_use_yplib) { 266 yp_get_default_domain(&ypxfr_dest_domain); 267 } else { 268 yp_error("no destination domain specified and \ 269 the local domain name isn't set"); 270 ypxfr_exit(YPXFR_BADARGS,NULL); 271 } 272 } 273 274 /* 275 * If a source domain is not specified, assume it to 276 * be the same as the destination domain. 277 */ 278 if (ypxfr_source_domain == NULL) { 279 ypxfr_source_domain = ypxfr_dest_domain; 280 } 281 282 /* 283 * If the source host is not specified, assume it to be the 284 * master for the specified map. If local NIS client facilities 285 * are turned on, we can figure this out using yp_master(). 286 * If not, we have to see if a local copy of the map exists 287 * and extract its YP_MASTER_NAME record. If _that_ fails, 288 * we are stuck and must ask the user for more information. 289 */ 290 if (ypxfr_source_host == NULL) { 291 if (!ypxfr_use_yplib) { 292 /* 293 * Double whammy: NIS isn't turned on and the user 294 * didn't specify a source host. 295 */ 296 char *dptr; 297 key.data = "YP_MASTER_NAME"; 298 key.size = sizeof("YP_MASTER_NAME") - 1; 299 300 if (yp_get_record(ypxfr_dest_domain, ypxfr_mapname, 301 &key, &data, 1) != YP_TRUE) { 302 yp_error("no source host specified"); 303 ypxfr_exit(YPXFR_BADARGS,NULL); 304 } 305 dptr = data.data; 306 dptr[data.size] = '\0'; 307 ypxfr_master = ypxfr_source_host = strdup(dptr); 308 } 309 } else { 310 if (ypxfr_use_yplib) 311 ypxfr_use_yplib = 0; 312 } 313 314 if (ypxfr_master == NULL) { 315 if ((ypxfr_master = ypxfr_get_master(ypxfr_source_domain, 316 ypxfr_mapname, 317 ypxfr_source_host, 318 ypxfr_use_yplib)) == NULL) { 319 yp_error("failed to find master of %s in domain %s: %s", 320 ypxfr_mapname, ypxfr_source_domain, 321 ypxfrerr_string(yp_errno)); 322 ypxfr_exit(YPXFR_MADDR,NULL); 323 } 324 } 325 326 /* 327 * If we got here and ypxfr_source_host is still undefined, 328 * it means we had to resort to using yp_master() to find the 329 * master server for the map. The source host and master should 330 * be identical. 331 */ 332 if (ypxfr_source_host == NULL) 333 ypxfr_source_host = ypxfr_master; 334 335 if ((ypxfr_order = ypxfr_get_order(ypxfr_source_domain, 336 ypxfr_mapname, 337 ypxfr_master, 0)) == 0) { 338 yp_error("failed to get order number of %s: %s", 339 ypxfr_mapname, yp_errno == YPXFR_SUCC ? 340 "map has order 0" : ypxfrerr_string(yp_errno)); 341 ypxfr_exit(YPXFR_YPERR,NULL); 342 } 343 344 key.data = "YP_LAST_MODIFIED"; 345 key.size = sizeof("YP_LAST_MODIFIED") - 1; 346 347 /* The order number is immaterial when the 'force' flag is set. */ 348 349 if (!ypxfr_force) { 350 int ignore = 0; 351 if (yp_get_record(ypxfr_dest_domain,ypxfr_mapname,&key,&data,1) != YP_TRUE) { 352 switch(yp_errno) { 353 case YP_NOKEY: 354 ypxfr_exit(YPXFR_FORCE,NULL); 355 break; 356 case YP_NOMAP: 357 /* 358 * If the map doesn't exist, we're 359 * creating it. Ignore the error. 360 */ 361 ignore++; 362 break; 363 case YP_BADDB: 364 default: 365 ypxfr_exit(YPXFR_DBM,NULL); 366 break; 367 } 368 } 369 if (!ignore && ypxfr_order <= atoi(data.data)) 370 ypxfr_exit(YPXFR_AGE, NULL); 371 372 } 373 374 /* Construct a temporary map file name */ 375 snprintf(tempmap, sizeof(tempmap), "%s.%d",ypxfr_mapname, getpid()); 376 snprintf(ypxfr_temp_map, sizeof(ypxfr_temp_map), "%s/%s/%s", yp_dir, 377 ypxfr_dest_domain, tempmap); 378 379 if (getrpcport(ypxfr_master, YPXFRD_FREEBSD_PROG, 380 YPXFRD_FREEBSD_VERS, IPPROTO_TCP)) { 381 /* Try to send using ypxfrd. If it fails, use old method. */ 382 if (!ypxfrd_get_map(ypxfr_master, ypxfr_mapname, 383 ypxfr_source_domain, ypxfr_temp_map)) 384 goto leave; 385 } 386 387 /* Open the temporary map read/write. */ 388 if ((dbp = yp_open_db_rw(ypxfr_dest_domain, tempmap, 0)) == NULL) { 389 yp_error("failed to open temporary map file"); 390 ypxfr_exit(YPXFR_DBM,NULL); 391 } 392 393 /* 394 * Fill in the keys we already know, such as the order number, 395 * master name, input file name (we actually make up a bogus 396 * name for that) and output file name. 397 */ 398 snprintf(buf, sizeof(buf), "%d", ypxfr_order); 399 data.data = buf; 400 data.size = strlen(buf); 401 402 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 403 yp_error("failed to write order number to database"); 404 ypxfr_exit(YPXFR_DBM,&ypxfr_temp_map); 405 } 406 407 key.data = "YP_MASTER_NAME"; 408 key.size = sizeof("YP_MASTER_NAME") - 1; 409 data.data = ypxfr_master; 410 data.size = strlen(ypxfr_master); 411 412 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 413 yp_error("failed to write master name to database"); 414 ypxfr_exit(YPXFR_DBM,&ypxfr_temp_map); 415 } 416 417 key.data = "YP_DOMAIN_NAME"; 418 key.size = sizeof("YP_DOMAIN_NAME") - 1; 419 data.data = ypxfr_dest_domain; 420 data.size = strlen(ypxfr_dest_domain); 421 422 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 423 yp_error("failed to write domain name to database"); 424 ypxfr_exit(YPXFR_DBM,&ypxfr_temp_map); 425 } 426 427 snprintf (buf, sizeof(buf), "%s:%s", ypxfr_source_host, ypxfr_mapname); 428 429 key.data = "YP_INPUT_NAME"; 430 key.size = sizeof("YP_INPUT_NAME") - 1; 431 data.data = &buf; 432 data.size = strlen(buf); 433 434 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 435 yp_error("failed to write input name to database"); 436 ypxfr_exit(YPXFR_DBM,&ypxfr_temp_map); 437 438 } 439 440 snprintf(buf, sizeof(buf), "%s/%s/%s", yp_dir, ypxfr_dest_domain, 441 ypxfr_mapname); 442 443 key.data = "YP_OUTPUT_NAME"; 444 key.size = sizeof("YP_OUTPUT_NAME") - 1; 445 data.data = &buf; 446 data.size = strlen(buf); 447 448 if (yp_put_record(dbp, &key, &data, 0) != YP_TRUE) { 449 yp_error("failed to write output name to database"); 450 ypxfr_exit(YPXFR_DBM,&ypxfr_temp_map); 451 } 452 453 /* Now suck over the contents of the map from the master. */ 454 455 if (ypxfr_get_map(ypxfr_mapname,ypxfr_source_domain, 456 ypxfr_source_host, ypxfr_foreach)){ 457 yp_error("failed to retrieve map from source host"); 458 ypxfr_exit(YPXFR_YPERR,&ypxfr_temp_map); 459 } 460 461 (void)(dbp->close)(dbp); 462 dbp = NULL; /* <- yes, it seems this is necessary. */ 463 464 leave: 465 466 snprintf(buf, sizeof(buf), "%s/%s/%s", yp_dir, ypxfr_dest_domain, 467 ypxfr_mapname); 468 469 /* Peek at the order number again and check for skew. */ 470 if ((ypxfr_skew_check = ypxfr_get_order(ypxfr_source_domain, 471 ypxfr_mapname, 472 ypxfr_master, 0)) == 0) { 473 yp_error("failed to get order number of %s: %s", 474 ypxfr_mapname, yp_errno == YPXFR_SUCC ? 475 "map has order 0" : ypxfrerr_string(yp_errno)); 476 ypxfr_exit(YPXFR_YPERR,&ypxfr_temp_map); 477 } 478 479 if (ypxfr_order != ypxfr_skew_check) 480 ypxfr_exit(YPXFR_SKEW,&ypxfr_temp_map); 481 482 /* 483 * Send a YPPROC_CLEAR to the local ypserv. 484 */ 485 if (ypxfr_clear) { 486 char in = 0; 487 char *out = NULL; 488 int stat; 489 if ((stat = callrpc("localhost",YPPROG,YPVERS,YPPROC_CLEAR, 490 xdr_void, (void *)&in, 491 xdr_void, (void *)out)) != RPC_SUCCESS) { 492 yp_error("failed to send 'clear' to local ypserv: %s", 493 clnt_sperrno((enum clnt_stat) stat)); 494 ypxfr_exit(YPXFR_CLEAR, &ypxfr_temp_map); 495 } 496 } 497 498 /* 499 * Put the new map in place immediately. I'm not sure if the 500 * kernel does an unlink() and rename() atomically in the event 501 * that we move a new copy of a map over the top of an existing 502 * one, but there's less chance of a race condition happening 503 * than if we were to do the unlink() ourselves. 504 */ 505 if (rename(ypxfr_temp_map, buf) == -1) { 506 yp_error("rename(%s,%s) failed: %s", ypxfr_temp_map, buf, 507 strerror(errno)); 508 ypxfr_exit(YPXFR_FILE,NULL); 509 } 510 511 ypxfr_exit(YPXFR_SUCC,NULL); 512 513 return(1); 514 } 515