rpcbind.c revision 1.13
1 /* $NetBSD: rpcbind.c,v 1.13 2007/05/16 14:42:08 christos 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 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 getrlimit(RLIMIT_NOFILE, &rl); 122 if (rl.rlim_cur < 128) { 123 if (rl.rlim_max <= 128) 124 rl.rlim_cur = rl.rlim_max; 125 else 126 rl.rlim_cur = 128; 127 setrlimit(RLIMIT_NOFILE, &rl); 128 } 129 if (geteuid()) /* This command allowed only to root */ 130 errx(1, "Sorry. You are not superuser"); 131 nc_handle = setnetconfig(); /* open netconfig file */ 132 if (nc_handle == NULL) 133 errx(1, "could not read /etc/netconfig"); 134 #ifdef PORTMAP 135 udptrans = ""; 136 tcptrans = ""; 137 #endif 138 139 nconf = getnetconfigent("local"); 140 if (nconf == NULL) 141 errx(1, "can't find local transport"); 142 143 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec); 144 145 init_transport(nconf); 146 147 while ((nconf = getnetconfig(nc_handle))) { 148 if (nconf->nc_flag & NC_VISIBLE) 149 init_transport(nconf); 150 } 151 endnetconfig(nc_handle); 152 153 /* catch the usual termination signals for graceful exit */ 154 (void) signal(SIGCHLD, reap); 155 (void) signal(SIGINT, terminate); 156 (void) signal(SIGTERM, terminate); 157 (void) signal(SIGQUIT, terminate); 158 /* ignore others that could get sent */ 159 (void) signal(SIGPIPE, SIG_IGN); 160 (void) signal(SIGHUP, SIG_IGN); 161 (void) signal(SIGUSR1, SIG_IGN); 162 (void) signal(SIGUSR2, SIG_IGN); 163 #ifdef WARMSTART 164 if (warmstart) { 165 read_warmstart(); 166 } 167 #endif 168 if (debugging) { 169 printf("rpcbind debugging enabled."); 170 if (doabort) { 171 printf(" Will abort on errors!\n"); 172 } else { 173 printf("\n"); 174 } 175 } else { 176 if (daemon(0, 0)) 177 err(1, "fork failed"); 178 } 179 180 openlog("rpcbind", 0, LOG_DAEMON); 181 pidfile(NULL); 182 183 if (runasdaemon) { 184 struct passwd *p; 185 186 if((p = getpwnam(RUN_AS)) == NULL) { 187 syslog(LOG_ERR, "cannot get uid of daemon: %m"); 188 exit(1); 189 } 190 if (setuid(p->pw_uid) == -1) { 191 syslog(LOG_ERR, "setuid to daemon failed: %m"); 192 exit(1); 193 } 194 } 195 196 network_init(); 197 198 my_svc_run(); 199 syslog(LOG_ERR, "svc_run returned unexpectedly"); 200 rpcbind_abort(); 201 /* NOTREACHED */ 202 203 return 0; 204 } 205 206 /* 207 * Adds the entry into the rpcbind database. 208 * If PORTMAP, then for UDP and TCP, it adds the entries for version 2 also 209 * Returns 0 if succeeds, else fails 210 */ 211 static int 212 init_transport(struct netconfig *nconf) 213 { 214 int fd; 215 struct t_bind taddr; 216 struct addrinfo hints, *res = NULL; 217 struct __rpc_sockinfo si; 218 SVCXPRT *my_xprt; 219 int status; /* bound checking ? */ 220 int aicode; 221 int addrlen; 222 struct sockaddr *sa; 223 struct sockaddr_un sun; 224 const int one = 1; 225 226 if ((nconf->nc_semantics != NC_TPI_CLTS) && 227 (nconf->nc_semantics != NC_TPI_COTS) && 228 (nconf->nc_semantics != NC_TPI_COTS_ORD)) 229 return 1; /* not my type */ 230 #ifdef ND_DEBUG 231 if (debugging) { 232 int i; 233 char **s; 234 235 (void)fprintf(stderr, "%s: %ld lookup routines :\n", 236 nconf->nc_netid, nconf->nc_nlookups); 237 for (i = 0, s = nconf->nc_lookups; i < nconf->nc_nlookups; 238 i++, s++) 239 (void)fprintf(stderr, "[%d] - %s\n", i, *s); 240 } 241 #endif 242 243 /* 244 * XXX - using RPC library internal functions. 245 */ 246 if ((fd = __rpc_nconf2fd(nconf)) < 0) { 247 warn("Cannot create socket for `%s' (%m)", nconf->nc_netid); 248 return 1; 249 } 250 251 if (!__rpc_nconf2sockinfo(nconf, &si)) { 252 warnx("Cannot get information for `%s'", nconf->nc_netid); 253 return 1; 254 } 255 256 if (si.si_af == AF_INET6) { 257 /* 258 * We're doing host-based access checks here, so don't allow 259 * v4-in-v6 to confuse things. 260 */ 261 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, 262 sizeof one) < 0) { 263 warn("Can't make socket ipv6 only"); 264 return 1; 265 } 266 } 267 268 269 if (!strcmp(nconf->nc_netid, "local")) { 270 (void)memset(&sun, 0, sizeof sun); 271 sun.sun_family = AF_LOCAL; 272 (void)unlink(_PATH_RPCBINDSOCK); 273 (void)strlcpy(sun.sun_path, _PATH_RPCBINDSOCK, 274 sizeof(sun.sun_path)); 275 sun.sun_len = SUN_LEN(&sun); 276 addrlen = sizeof(struct sockaddr_un); 277 sa = (struct sockaddr *)&sun; 278 } else { 279 /* Get rpcbind's address on this transport */ 280 281 (void)memset(&hints, 0, sizeof hints); 282 hints.ai_flags = AI_PASSIVE; 283 hints.ai_family = si.si_af; 284 hints.ai_socktype = si.si_socktype; 285 hints.ai_protocol = si.si_proto; 286 if ((aicode = getaddrinfo(NULL, servname, &hints, &res)) != 0) { 287 warnx("Cannot get local address for `%s' (%s)", 288 nconf->nc_netid, gai_strerror(aicode)); 289 return 1; 290 } 291 addrlen = res->ai_addrlen; 292 sa = (struct sockaddr *)res->ai_addr; 293 } 294 295 if (bind(fd, sa, addrlen) < 0) { 296 warn("Cannot bind `%s'", nconf->nc_netid); 297 if (res != NULL) 298 freeaddrinfo(res); 299 return 1; 300 } 301 if (sa->sa_family == AF_LOCAL) 302 if (chmod(sun.sun_path, S_IRWXU|S_IRWXG|S_IRWXO) == -1) 303 warn("Cannot chmod `%s'", sun.sun_path); 304 305 /* Copy the address */ 306 taddr.addr.len = taddr.addr.maxlen = addrlen; 307 taddr.addr.buf = malloc(addrlen); 308 if (taddr.addr.buf == NULL) { 309 warn("Cannot allocate memory for `%s' address", 310 nconf->nc_netid); 311 if (res != NULL) 312 freeaddrinfo(res); 313 return 1; 314 } 315 (void)memcpy(taddr.addr.buf, sa, addrlen); 316 #ifdef ND_DEBUG 317 if (debugging) { 318 /* for debugging print out our universal address */ 319 char *uaddr; 320 struct netbuf nb; 321 322 nb.buf = sa; 323 nb.len = nb.maxlen = sa->sa_len; 324 uaddr = taddr2uaddr(nconf, &nb); 325 (void)fprintf(stderr, "rpcbind: my address is %s\n", uaddr); 326 (void)free(uaddr); 327 } 328 #endif 329 330 if (res != NULL) 331 freeaddrinfo(res); 332 333 if (nconf->nc_semantics != NC_TPI_CLTS) 334 listen(fd, SOMAXCONN); 335 336 my_xprt = (SVCXPRT *)svc_tli_create(fd, nconf, &taddr, RPC_MAXDATASIZE, 337 RPC_MAXDATASIZE); 338 if (my_xprt == (SVCXPRT *)NULL) { 339 warnx("Could not create service for `%s'", nconf->nc_netid); 340 goto error; 341 } 342 343 #ifdef PORTMAP 344 /* 345 * Register both the versions for tcp/ip, udp/ip and local. 346 */ 347 if ((strcmp(nconf->nc_protofmly, NC_INET) == 0 && 348 (strcmp(nconf->nc_proto, NC_TCP) == 0 || 349 strcmp(nconf->nc_proto, NC_UDP) == 0)) || 350 strcmp(nconf->nc_netid, "local") == 0) { 351 struct pmaplist *pml; 352 353 if (!svc_register(my_xprt, PMAPPROG, PMAPVERS, 354 pmap_service, 0)) { 355 warn("Could not register on `%s'", nconf->nc_netid); 356 goto error; 357 } 358 pml = malloc(sizeof (struct pmaplist)); 359 if (pml == NULL) { 360 warn("Cannot allocate memory"); 361 goto error; 362 } 363 pml->pml_map.pm_prog = PMAPPROG; 364 pml->pml_map.pm_vers = PMAPVERS; 365 pml->pml_map.pm_port = PMAPPORT; 366 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 367 if (tcptrans[0]) { 368 warnx( 369 "Cannot have more than one TCP transport"); 370 free(pml); 371 goto error; 372 } 373 tcptrans = strdup(nconf->nc_netid); 374 if (tcptrans == NULL) { 375 free(pml); 376 warn("Cannot allocate memory"); 377 goto error; 378 } 379 pml->pml_map.pm_prot = IPPROTO_TCP; 380 381 /* Let's snarf the universal address */ 382 /* "h1.h2.h3.h4.p1.p2" */ 383 tcp_uaddr = taddr2uaddr(nconf, &taddr.addr); 384 } else if (strcmp(nconf->nc_proto, NC_UDP) == 0) { 385 if (udptrans[0]) { 386 free(pml); 387 warnx( 388 "Cannot have more than one UDP transport"); 389 goto error; 390 } 391 udptrans = strdup(nconf->nc_netid); 392 if (udptrans == NULL) { 393 free(pml); 394 warn("Cannot allocate memory"); 395 goto error; 396 } 397 pml->pml_map.pm_prot = IPPROTO_UDP; 398 399 /* Let's snarf the universal address */ 400 /* "h1.h2.h3.h4.p1.p2" */ 401 udp_uaddr = taddr2uaddr(nconf, &taddr.addr); 402 } 403 pml->pml_next = list_pml; 404 list_pml = pml; 405 406 /* Add version 3 information */ 407 pml = malloc(sizeof (struct pmaplist)); 408 if (pml == NULL) { 409 warn("Cannot allocate memory"); 410 goto error; 411 } 412 pml->pml_map = list_pml->pml_map; 413 pml->pml_map.pm_vers = RPCBVERS; 414 pml->pml_next = list_pml; 415 list_pml = pml; 416 417 /* Add version 4 information */ 418 pml = malloc(sizeof (struct pmaplist)); 419 if (pml == NULL) { 420 warn("Cannot allocate memory"); 421 goto error; 422 } 423 pml->pml_map = list_pml->pml_map; 424 pml->pml_map.pm_vers = RPCBVERS4; 425 pml->pml_next = list_pml; 426 list_pml = pml; 427 428 /* Also add version 2 stuff to rpcbind list */ 429 rbllist_add(PMAPPROG, PMAPVERS, nconf, &taddr.addr); 430 } 431 #endif 432 433 /* version 3 registration */ 434 if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS, rpcb_service_3, NULL)) { 435 warn("Could not register %s version 3", nconf->nc_netid); 436 goto error; 437 } 438 rbllist_add(RPCBPROG, RPCBVERS, nconf, &taddr.addr); 439 440 /* version 4 registration */ 441 if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS4, rpcb_service_4, NULL)) { 442 warn("Could not register %s version 4", nconf->nc_netid); 443 goto error; 444 } 445 rbllist_add(RPCBPROG, RPCBVERS4, nconf, &taddr.addr); 446 447 /* decide if bound checking works for this transport */ 448 status = add_bndlist(nconf, &taddr.addr); 449 #ifdef BIND_DEBUG 450 if (debugging) { 451 if (status < 0) { 452 fprintf(stderr, "Error in finding bind status for %s\n", 453 nconf->nc_netid); 454 } else if (status == 0) { 455 fprintf(stderr, "check binding for %s\n", 456 nconf->nc_netid); 457 } else if (status > 0) { 458 fprintf(stderr, "No check binding for %s\n", 459 nconf->nc_netid); 460 } 461 } 462 #endif 463 /* 464 * rmtcall only supported on CLTS transports for now. 465 */ 466 if (nconf->nc_semantics == NC_TPI_CLTS) { 467 status = create_rmtcall_fd(nconf); 468 469 #ifdef BIND_DEBUG 470 if (debugging) { 471 if (status < 0) { 472 fprintf(stderr, 473 "Could not create rmtcall fd for %s\n", 474 nconf->nc_netid); 475 } else { 476 fprintf(stderr, "rmtcall fd for %s is %d\n", 477 nconf->nc_netid, status); 478 } 479 } 480 #endif 481 } 482 return (0); 483 error: 484 (void)close(fd); 485 return (1); 486 } 487 488 static void 489 rbllist_add(rpcprog_t prog, rpcvers_t vers, struct netconfig *nconf, 490 struct netbuf *addr) 491 { 492 rpcblist_ptr rbl; 493 494 rbl = malloc(sizeof(rpcblist)); 495 if (rbl == NULL) { 496 warn("Out of memory"); 497 return; 498 } 499 500 rbl->rpcb_map.r_prog = prog; 501 rbl->rpcb_map.r_vers = vers; 502 rbl->rpcb_map.r_netid = strdup(nconf->nc_netid); 503 rbl->rpcb_map.r_addr = taddr2uaddr(nconf, addr); 504 rbl->rpcb_map.r_owner = strdup(rpcbind_superuser); 505 rbl->rpcb_next = list_rbl; /* Attach to global list */ 506 list_rbl = rbl; 507 } 508 509 /* 510 * Catch the signal and die 511 */ 512 static void 513 terminate(int dummy) 514 { 515 #ifdef WARMSTART 516 syslog(LOG_ERR, 517 "rpcbind terminating on signal. Restart with \"rpcbind -w\""); 518 write_warmstart(); /* Dump yourself */ 519 #endif 520 exit(2); 521 } 522 523 void 524 rpcbind_abort() 525 { 526 #ifdef WARMSTART 527 write_warmstart(); /* Dump yourself */ 528 #endif 529 abort(); 530 } 531 532 /* get command line options */ 533 static void 534 parseargs(int argc, char *argv[]) 535 { 536 int c; 537 538 while ((c = getopt(argc, argv, "dwailLs")) != -1) { 539 switch (c) { 540 case 'a': 541 doabort = 1; /* when debugging, do an abort on */ 542 break; /* errors; for rpcbind developers */ 543 /* only! */ 544 case 'd': 545 debugging = 1; 546 break; 547 case 'i': 548 insecure = 1; 549 break; 550 case 'L': 551 oldstyle_local = 1; 552 break; 553 case 'l': 554 verboselog = 1; 555 break; 556 case 's': 557 runasdaemon = 1; 558 break; 559 #ifdef WARMSTART 560 case 'w': 561 warmstart = 1; 562 break; 563 #endif 564 default: /* error */ 565 fprintf(stderr, "usage: rpcbind [-Idwils]\n"); 566 exit (1); 567 } 568 } 569 if (doabort && !debugging) { 570 fprintf(stderr, 571 "-a (abort) specified without -d (debugging) -- ignored.\n"); 572 doabort = 0; 573 } 574 } 575 576 void 577 reap(int dummy) 578 { 579 int save_errno = errno; 580 581 while (wait3(NULL, WNOHANG, NULL) > 0) 582 ; 583 errno = save_errno; 584 } 585 586 void 587 toggle_verboselog(int dummy) 588 { 589 verboselog = !verboselog; 590 } 591
Indexes created Tue Sep 23 14:10:03 GMT 2025