rpcbind.c revision 1.21
1 /* $NetBSD: rpcbind.c,v 1.21 2015/05/09 18:22:37 dholland Exp $ */ 2 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31 /* 32 * Copyright (c) 1984 - 1991 by Sun Microsystems, Inc. 33 */ 34 35 /* #ident "@(#)rpcbind.c 1.19 94/04/25 SMI" */ 36 37 #if 0 38 #ifndef lint 39 static char sccsid[] = "@(#)rpcbind.c 1.35 89/04/21 Copyr 1984 Sun Micro"; 40 #endif 41 #endif 42 43 /* 44 * rpcbind.c 45 * Implements the program, version to address mapping for rpc. 46 * 47 */ 48 49 #include <sys/types.h> 50 #include <sys/stat.h> 51 #include <sys/errno.h> 52 #include <sys/time.h> 53 #include <sys/resource.h> 54 #include <sys/wait.h> 55 #include <sys/signal.h> 56 #include <sys/socket.h> 57 #include <sys/un.h> 58 #include <rpc/rpc.h> 59 #ifdef PORTMAP 60 #include <netinet/in.h> 61 #endif 62 #include <netdb.h> 63 #include <stdio.h> 64 #include <netconfig.h> 65 #include <stdlib.h> 66 #include <unistd.h> 67 #include <syslog.h> 68 #include <err.h> 69 #include <util.h> 70 #include <pwd.h> 71 #include <string.h> 72 #include <errno.h> 73 #include "rpcbind.h" 74 75 /* Global variables */ 76 int debugging = 0; /* Tell me what's going on */ 77 int doabort = 0; /* When debugging, do an abort on errors */ 78 rpcblist_ptr list_rbl; /* A list of version 3/4 rpcbind services */ 79 80 /* who to suid to if -s is given */ 81 #define RUN_AS "daemon" 82 83 int runasdaemon = 0; 84 int insecure = 0; 85 int oldstyle_local = 0; 86 int verboselog = 0; 87 88 #ifdef WARMSTART 89 /* Local Variable */ 90 static int warmstart = 0; /* Grab a old copy of registrations */ 91 #endif 92 93 #ifdef PORTMAP 94 struct pmaplist *list_pml; /* A list of version 2 rpcbind services */ 95 const char *udptrans; /* Name of UDP transport */ 96 const char *tcptrans; /* Name of TCP transport */ 97 const char *udp_uaddr; /* Universal UDP address */ 98 const char *tcp_uaddr; /* Universal TCP address */ 99 #endif 100 static const char servname[] = "sunrpc"; 101 102 const char rpcbind_superuser[] = "superuser"; 103 const char rpcbind_unknown[] = "unknown"; 104 105 static int init_transport(struct netconfig *); 106 static void rbllist_add(rpcprog_t, rpcvers_t, struct netconfig *, 107 struct netbuf *); 108 __dead static void terminate(int); 109 static void parseargs(int, char *[]); 110 111 int 112 main(int argc, char *argv[]) 113 { 114 struct netconfig *nconf; 115 void *nc_handle; /* Net config handle */ 116 struct rlimit rl; 117 int maxrec = RPC_MAXDATASIZE; 118 119 parseargs(argc, argv); 120 121 if (getrlimit(RLIMIT_NOFILE, &rl) != -1 && rl.rlim_cur < 128) { 122 if (rl.rlim_max <= 128) 123 rl.rlim_cur = rl.rlim_max; 124 else 125 rl.rlim_cur = 128; 126 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 127 err(EXIT_FAILURE, "setrlimit(RLIMIT_NOFILE)"); 128 } 129 } 130 nc_handle = setnetconfig(); /* open netconfig file */ 131 if (nc_handle == NULL) 132 errx(1, "could not read /etc/netconfig"); 133 #ifdef PORTMAP 134 udptrans = ""; 135 tcptrans = ""; 136 #endif 137 138 nconf = getnetconfigent("local"); 139 if (nconf == NULL) 140 errx(1, "can't find local transport"); 141 142 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec); 143 144 init_transport(nconf); 145 146 while ((nconf = getnetconfig(nc_handle))) { 147 if (nconf->nc_flag & NC_VISIBLE) 148 init_transport(nconf); 149 } 150 endnetconfig(nc_handle); 151 152 /* catch the usual termination signals for graceful exit */ 153 (void) signal(SIGCHLD, reap); 154 (void) signal(SIGINT, terminate); 155 (void) signal(SIGTERM, terminate); 156 (void) signal(SIGQUIT, terminate); 157 /* ignore others that could get sent */ 158 (void) signal(SIGPIPE, SIG_IGN); 159 (void) signal(SIGHUP, SIG_IGN); 160 (void) signal(SIGUSR1, SIG_IGN); 161 (void) signal(SIGUSR2, SIG_IGN); 162 #ifdef WARMSTART 163 if (warmstart) { 164 read_warmstart(); 165 } 166 #endif 167 if (debugging) { 168 printf("rpcbind debugging enabled."); 169 if (doabort) { 170 printf(" Will abort on errors!\n"); 171 } else { 172 printf("\n"); 173 } 174 } else { 175 if (daemon(0, 0)) 176 err(1, "fork failed"); 177 } 178 179 openlog("rpcbind", 0, LOG_DAEMON); 180 pidfile(NULL); 181 182 if (runasdaemon) { 183 struct passwd *p; 184 185 if((p = getpwnam(RUN_AS)) == NULL) { 186 syslog(LOG_ERR, "cannot get uid of daemon: %m"); 187 exit(1); 188 } 189 if (setuid(p->pw_uid) == -1) { 190 syslog(LOG_ERR, "setuid to daemon failed: %m"); 191 exit(1); 192 } 193 } 194 195 network_init(); 196 197 my_svc_run(); 198 syslog(LOG_ERR, "svc_run returned unexpectedly"); 199 rpcbind_abort(); 200 /* NOTREACHED */ 201 202 return 0; 203 } 204 205 /* 206 * Adds the entry into the rpcbind database. 207 * If PORTMAP, then for UDP and TCP, it adds the entries for version 2 also 208 * Returns 0 if succeeds, else fails 209 */ 210 static int 211 init_transport(struct netconfig *nconf) 212 { 213 int fd; 214 struct t_bind taddr; 215 struct addrinfo hints, *res = NULL; 216 struct __rpc_sockinfo si; 217 SVCXPRT *my_xprt; 218 int status; /* bound checking ? */ 219 int aicode; 220 int addrlen; 221 struct sockaddr *sa; 222 struct sockaddr_un sun; 223 const int one = 1; 224 225 if ((nconf->nc_semantics != NC_TPI_CLTS) && 226 (nconf->nc_semantics != NC_TPI_COTS) && 227 (nconf->nc_semantics != NC_TPI_COTS_ORD)) 228 return 1; /* not my type */ 229 #ifdef RPCBIND_DEBUG 230 if (debugging) { 231 int i; 232 char **s; 233 234 (void)fprintf(stderr, "%s: %ld lookup routines :\n", 235 nconf->nc_netid, nconf->nc_nlookups); 236 for (i = 0, s = nconf->nc_lookups; i < nconf->nc_nlookups; 237 i++, s++) 238 (void)fprintf(stderr, "[%d] - %s\n", i, *s); 239 } 240 #endif 241 242 /* 243 * XXX - using RPC library internal functions. 244 */ 245 if ((fd = __rpc_nconf2fd(nconf)) < 0) { 246 if (errno == EAFNOSUPPORT) 247 return 1; 248 warn("Cannot create socket for `%s'", nconf->nc_netid); 249 return 1; 250 } 251 252 if (!__rpc_nconf2sockinfo(nconf, &si)) { 253 warnx("Cannot get information for `%s'", nconf->nc_netid); 254 return 1; 255 } 256 257 if (si.si_af == AF_INET6) { 258 /* 259 * We're doing host-based access checks here, so don't allow 260 * v4-in-v6 to confuse things. 261 */ 262 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, 263 sizeof one) < 0) { 264 warn("Can't make socket ipv6 only"); 265 return 1; 266 } 267 } 268 269 270 if (!strcmp(nconf->nc_netid, "local")) { 271 (void)memset(&sun, 0, sizeof sun); 272 sun.sun_family = AF_LOCAL; 273 (void)unlink(_PATH_RPCBINDSOCK); 274 (void)strlcpy(sun.sun_path, _PATH_RPCBINDSOCK, 275 sizeof(sun.sun_path)); 276 sun.sun_len = SUN_LEN(&sun); 277 addrlen = sizeof(struct sockaddr_un); 278 sa = (struct sockaddr *)&sun; 279 } else { 280 /* Get rpcbind's address on this transport */ 281 282 (void)memset(&hints, 0, sizeof hints); 283 hints.ai_flags = AI_PASSIVE; 284 hints.ai_family = si.si_af; 285 hints.ai_socktype = si.si_socktype; 286 hints.ai_protocol = si.si_proto; 287 if ((aicode = getaddrinfo(NULL, servname, &hints, &res)) != 0) { 288 warnx("Cannot get local address for `%s' (%s)", 289 nconf->nc_netid, gai_strerror(aicode)); 290 return 1; 291 } 292 addrlen = res->ai_addrlen; 293 sa = (struct sockaddr *)res->ai_addr; 294 } 295 296 if (bind(fd, sa, addrlen) < 0) { 297 warn("Cannot bind `%s'", nconf->nc_netid); 298 if (res != NULL) 299 freeaddrinfo(res); 300 return 1; 301 } 302 if (sa->sa_family == AF_LOCAL) 303 if (chmod(sun.sun_path, S_IRWXU|S_IRWXG|S_IRWXO) == -1) 304 warn("Cannot chmod `%s'", sun.sun_path); 305 306 /* Copy the address */ 307 taddr.addr.len = taddr.addr.maxlen = addrlen; 308 taddr.addr.buf = malloc(addrlen); 309 if (taddr.addr.buf == NULL) { 310 warn("Cannot allocate memory for `%s' address", 311 nconf->nc_netid); 312 if (res != NULL) 313 freeaddrinfo(res); 314 return 1; 315 } 316 (void)memcpy(taddr.addr.buf, sa, addrlen); 317 #ifdef RPCBIND_DEBUG 318 if (debugging) { 319 /* for debugging print out our universal address */ 320 char *uaddr; 321 struct netbuf nb; 322 323 nb.buf = sa; 324 nb.len = nb.maxlen = sa->sa_len; 325 uaddr = taddr2uaddr(nconf, &nb); 326 (void)fprintf(stderr, "rpcbind: my address is %s\n", uaddr); 327 (void)free(uaddr); 328 } 329 #endif 330 331 if (res != NULL) 332 freeaddrinfo(res); 333 334 if (nconf->nc_semantics != NC_TPI_CLTS) 335 listen(fd, SOMAXCONN); 336 337 my_xprt = (SVCXPRT *)svc_tli_create(fd, nconf, &taddr, RPC_MAXDATASIZE, 338 RPC_MAXDATASIZE); 339 if (my_xprt == NULL) { 340 warnx("Could not create service for `%s'", nconf->nc_netid); 341 goto error; 342 } 343 344 #ifdef PORTMAP 345 /* 346 * Register both the versions for tcp/ip, udp/ip and local. 347 */ 348 if ((strcmp(nconf->nc_protofmly, NC_INET) == 0 && 349 (strcmp(nconf->nc_proto, NC_TCP) == 0 || 350 strcmp(nconf->nc_proto, NC_UDP) == 0)) || 351 strcmp(nconf->nc_netid, "local") == 0) { 352 struct pmaplist *pml; 353 354 if (!svc_register(my_xprt, PMAPPROG, PMAPVERS, 355 pmap_service, 0)) { 356 warn("Could not register on `%s'", nconf->nc_netid); 357 goto error; 358 } 359 pml = malloc(sizeof (struct pmaplist)); 360 if (pml == NULL) { 361 warn("Cannot allocate memory"); 362 goto error; 363 } 364 pml->pml_map.pm_prog = PMAPPROG; 365 pml->pml_map.pm_vers = PMAPVERS; 366 pml->pml_map.pm_port = PMAPPORT; 367 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 368 if (tcptrans[0]) { 369 warnx( 370 "Cannot have more than one TCP transport"); 371 free(pml); 372 goto error; 373 } 374 tcptrans = strdup(nconf->nc_netid); 375 if (tcptrans == NULL) { 376 free(pml); 377 warn("Cannot allocate memory"); 378 goto error; 379 } 380 pml->pml_map.pm_prot = IPPROTO_TCP; 381 382 /* Let's snarf the universal address */ 383 /* "h1.h2.h3.h4.p1.p2" */ 384 tcp_uaddr = taddr2uaddr(nconf, &taddr.addr); 385 } else if (strcmp(nconf->nc_proto, NC_UDP) == 0) { 386 if (udptrans[0]) { 387 free(pml); 388 warnx( 389 "Cannot have more than one UDP transport"); 390 goto error; 391 } 392 udptrans = strdup(nconf->nc_netid); 393 if (udptrans == NULL) { 394 free(pml); 395 warn("Cannot allocate memory"); 396 goto error; 397 } 398 pml->pml_map.pm_prot = IPPROTO_UDP; 399 400 /* Let's snarf the universal address */ 401 /* "h1.h2.h3.h4.p1.p2" */ 402 udp_uaddr = taddr2uaddr(nconf, &taddr.addr); 403 } 404 pml->pml_next = list_pml; 405 list_pml = pml; 406 407 /* Add version 3 information */ 408 pml = malloc(sizeof (struct pmaplist)); 409 if (pml == NULL) { 410 warn("Cannot allocate memory"); 411 goto error; 412 } 413 pml->pml_map = list_pml->pml_map; 414 pml->pml_map.pm_vers = RPCBVERS; 415 pml->pml_next = list_pml; 416 list_pml = pml; 417 418 /* Add version 4 information */ 419 pml = malloc(sizeof (struct pmaplist)); 420 if (pml == NULL) { 421 warn("Cannot allocate memory"); 422 goto error; 423 } 424 pml->pml_map = list_pml->pml_map; 425 pml->pml_map.pm_vers = RPCBVERS4; 426 pml->pml_next = list_pml; 427 list_pml = pml; 428 429 /* Also add version 2 stuff to rpcbind list */ 430 rbllist_add(PMAPPROG, PMAPVERS, nconf, &taddr.addr); 431 } 432 #endif 433 434 /* version 3 registration */ 435 if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS, rpcb_service_3, NULL)) { 436 warn("Could not register %s version 3", nconf->nc_netid); 437 goto error; 438 } 439 rbllist_add(RPCBPROG, RPCBVERS, nconf, &taddr.addr); 440 441 /* version 4 registration */ 442 if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS4, rpcb_service_4, NULL)) { 443 warn("Could not register %s version 4", nconf->nc_netid); 444 goto error; 445 } 446 rbllist_add(RPCBPROG, RPCBVERS4, nconf, &taddr.addr); 447 448 /* decide if bound checking works for this transport */ 449 status = add_bndlist(nconf, &taddr.addr); 450 #ifdef RPCBIND_DEBUG 451 if (debugging) { 452 if (status < 0) { 453 fprintf(stderr, "Error in finding bind status for %s\n", 454 nconf->nc_netid); 455 } else if (status == 0) { 456 fprintf(stderr, "check binding for %s\n", 457 nconf->nc_netid); 458 } else if (status > 0) { 459 fprintf(stderr, "No check binding for %s\n", 460 nconf->nc_netid); 461 } 462 } 463 #else 464 __USE(status); 465 #endif 466 /* 467 * rmtcall only supported on CLTS transports for now. 468 */ 469 if (nconf->nc_semantics == NC_TPI_CLTS) { 470 status = create_rmtcall_fd(nconf); 471 472 #ifdef RPCBIND_DEBUG 473 if (debugging) { 474 if (status < 0) { 475 fprintf(stderr, 476 "Could not create rmtcall fd for %s\n", 477 nconf->nc_netid); 478 } else { 479 fprintf(stderr, "rmtcall fd for %s is %d\n", 480 nconf->nc_netid, status); 481 } 482 } 483 #endif 484 } 485 return (0); 486 error: 487 (void)close(fd); 488 return (1); 489 } 490 491 static void 492 rbllist_add(rpcprog_t prog, rpcvers_t vers, struct netconfig *nconf, 493 struct netbuf *addr) 494 { 495 rpcblist_ptr rbl; 496 497 rbl = malloc(sizeof(rpcblist)); 498 if (rbl == NULL) { 499 warn("Out of memory"); 500 return; 501 } 502 503 rbl->rpcb_map.r_prog = prog; 504 rbl->rpcb_map.r_vers = vers; 505 rbl->rpcb_map.r_netid = strdup(nconf->nc_netid); 506 rbl->rpcb_map.r_addr = taddr2uaddr(nconf, addr); 507 rbl->rpcb_map.r_owner = strdup(rpcbind_superuser); 508 rbl->rpcb_next = list_rbl; /* Attach to global list */ 509 list_rbl = rbl; 510 } 511 512 /* 513 * Catch the signal and die 514 */ 515 static void 516 terminate(int dummy) 517 { 518 #ifdef WARMSTART 519 syslog(LOG_ERR, 520 "rpcbind terminating on signal. Restart with \"rpcbind -w\""); 521 write_warmstart(); /* Dump yourself */ 522 #endif 523 exit(2); 524 } 525 526 void 527 rpcbind_abort() 528 { 529 #ifdef WARMSTART 530 write_warmstart(); /* Dump yourself */ 531 #endif 532 abort(); 533 } 534 535 /* get command line options */ 536 static void 537 parseargs(int argc, char *argv[]) 538 { 539 int c; 540 541 while ((c = getopt(argc, argv, "dwailLs")) != -1) { 542 switch (c) { 543 case 'a': 544 doabort = 1; /* when debugging, do an abort on */ 545 break; /* errors; for rpcbind developers */ 546 /* only! */ 547 case 'd': 548 debugging = 1; 549 break; 550 case 'i': 551 insecure = 1; 552 break; 553 case 'L': 554 oldstyle_local = 1; 555 break; 556 case 'l': 557 verboselog = 1; 558 break; 559 case 's': 560 runasdaemon = 1; 561 break; 562 #ifdef WARMSTART 563 case 'w': 564 warmstart = 1; 565 break; 566 #endif 567 default: /* error */ 568 fprintf(stderr, "usage: rpcbind [-Idwils]\n"); 569 exit (1); 570 } 571 } 572 if (doabort && !debugging) { 573 fprintf(stderr, 574 "-a (abort) specified without -d (debugging) -- ignored.\n"); 575 doabort = 0; 576 } 577 } 578 579 void 580 reap(int dummy) 581 { 582 int save_errno = errno; 583 584 while (wait3(NULL, WNOHANG, NULL) > 0) 585 ; 586 errno = save_errno; 587 } 588 589 void 590 toggle_verboselog(int dummy) 591 { 592 verboselog = !verboselog; 593 } 594
Indexes created Tue Sep 23 02:09:52 GMT 2025