1 /* $NetBSD: rpcbind.c,v 1.15 2007/08/27 19:53:33 dsl 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 RPCBIND_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 if (errno == EAFNOSUPPORT) 248 return 1; 249 warn("Cannot create socket for `%s'", nconf->nc_netid); 250 return 1; 251 } 252 253 if (!__rpc_nconf2sockinfo(nconf, &si)) { 254 warnx("Cannot get information for `%s'", nconf->nc_netid); 255 return 1; 256 } 257 258 if (si.si_af == AF_INET6) { 259 /* 260 * We're doing host-based access checks here, so don't allow 261 * v4-in-v6 to confuse things. 262 */ 263 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, 264 sizeof one) < 0) { 265 warn("Can't make socket ipv6 only"); 266 return 1; 267 } 268 } 269 270 271 if (!strcmp(nconf->nc_netid, "local")) { 272 (void)memset(&sun, 0, sizeof sun); 273 sun.sun_family = AF_LOCAL; 274 (void)unlink(_PATH_RPCBINDSOCK); 275 (void)strlcpy(sun.sun_path, _PATH_RPCBINDSOCK, 276 sizeof(sun.sun_path)); 277 sun.sun_len = SUN_LEN(&sun); 278 addrlen = sizeof(struct sockaddr_un); 279 sa = (struct sockaddr *)&sun; 280 } else { 281 /* Get rpcbind's address on this transport */ 282 283 (void)memset(&hints, 0, sizeof hints); 284 hints.ai_flags = AI_PASSIVE; 285 hints.ai_family = si.si_af; 286 hints.ai_socktype = si.si_socktype; 287 hints.ai_protocol = si.si_proto; 288 if ((aicode = getaddrinfo(NULL, servname, &hints, &res)) != 0) { 289 warnx("Cannot get local address for `%s' (%s)", 290 nconf->nc_netid, gai_strerror(aicode)); 291 return 1; 292 } 293 addrlen = res->ai_addrlen; 294 sa = (struct sockaddr *)res->ai_addr; 295 } 296 297 if (bind(fd, sa, addrlen) < 0) { 298 warn("Cannot bind `%s'", nconf->nc_netid); 299 if (res != NULL) 300 freeaddrinfo(res); 301 return 1; 302 } 303 if (sa->sa_family == AF_LOCAL) 304 if (chmod(sun.sun_path, S_IRWXU|S_IRWXG|S_IRWXO) == -1) 305 warn("Cannot chmod `%s'", sun.sun_path); 306 307 /* Copy the address */ 308 taddr.addr.len = taddr.addr.maxlen = addrlen; 309 taddr.addr.buf = malloc(addrlen); 310 if (taddr.addr.buf == NULL) { 311 warn("Cannot allocate memory for `%s' address", 312 nconf->nc_netid); 313 if (res != NULL) 314 freeaddrinfo(res); 315 return 1; 316 } 317 (void)memcpy(taddr.addr.buf, sa, addrlen); 318 #ifdef RPCBIND_DEBUG 319 if (debugging) { 320 /* for debugging print out our universal address */ 321 char *uaddr; 322 struct netbuf nb; 323 324 nb.buf = sa; 325 nb.len = nb.maxlen = sa->sa_len; 326 uaddr = taddr2uaddr(nconf, &nb); 327 (void)fprintf(stderr, "rpcbind: my address is %s\n", uaddr); 328 (void)free(uaddr); 329 } 330 #endif 331 332 if (res != NULL) 333 freeaddrinfo(res); 334 335 if (nconf->nc_semantics != NC_TPI_CLTS) 336 listen(fd, SOMAXCONN); 337 338 my_xprt = (SVCXPRT *)svc_tli_create(fd, nconf, &taddr, RPC_MAXDATASIZE, 339 RPC_MAXDATASIZE); 340 if (my_xprt == (SVCXPRT *)NULL) { 341 warnx("Could not create service for `%s'", nconf->nc_netid); 342 goto error; 343 } 344 345 #ifdef PORTMAP 346 /* 347 * Register both the versions for tcp/ip, udp/ip and local. 348 */ 349 if ((strcmp(nconf->nc_protofmly, NC_INET) == 0 && 350 (strcmp(nconf->nc_proto, NC_TCP) == 0 || 351 strcmp(nconf->nc_proto, NC_UDP) == 0)) || 352 strcmp(nconf->nc_netid, "local") == 0) { 353 struct pmaplist *pml; 354 355 if (!svc_register(my_xprt, PMAPPROG, PMAPVERS, 356 pmap_service, 0)) { 357 warn("Could not register on `%s'", nconf->nc_netid); 358 goto error; 359 } 360 pml = malloc(sizeof (struct pmaplist)); 361 if (pml == NULL) { 362 warn("Cannot allocate memory"); 363 goto error; 364 } 365 pml->pml_map.pm_prog = PMAPPROG; 366 pml->pml_map.pm_vers = PMAPVERS; 367 pml->pml_map.pm_port = PMAPPORT; 368 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 369 if (tcptrans[0]) { 370 warnx( 371 "Cannot have more than one TCP transport"); 372 free(pml); 373 goto error; 374 } 375 tcptrans = strdup(nconf->nc_netid); 376 if (tcptrans == NULL) { 377 free(pml); 378 warn("Cannot allocate memory"); 379 goto error; 380 } 381 pml->pml_map.pm_prot = IPPROTO_TCP; 382 383 /* Let's snarf the universal address */ 384 /* "h1.h2.h3.h4.p1.p2" */ 385 tcp_uaddr = taddr2uaddr(nconf, &taddr.addr); 386 } else if (strcmp(nconf->nc_proto, NC_UDP) == 0) { 387 if (udptrans[0]) { 388 free(pml); 389 warnx( 390 "Cannot have more than one UDP transport"); 391 goto error; 392 } 393 udptrans = strdup(nconf->nc_netid); 394 if (udptrans == NULL) { 395 free(pml); 396 warn("Cannot allocate memory"); 397 goto error; 398 } 399 pml->pml_map.pm_prot = IPPROTO_UDP; 400 401 /* Let's snarf the universal address */ 402 /* "h1.h2.h3.h4.p1.p2" */ 403 udp_uaddr = taddr2uaddr(nconf, &taddr.addr); 404 } 405 pml->pml_next = list_pml; 406 list_pml = pml; 407 408 /* Add version 3 information */ 409 pml = malloc(sizeof (struct pmaplist)); 410 if (pml == NULL) { 411 warn("Cannot allocate memory"); 412 goto error; 413 } 414 pml->pml_map = list_pml->pml_map; 415 pml->pml_map.pm_vers = RPCBVERS; 416 pml->pml_next = list_pml; 417 list_pml = pml; 418 419 /* Add version 4 information */ 420 pml = malloc(sizeof (struct pmaplist)); 421 if (pml == NULL) { 422 warn("Cannot allocate memory"); 423 goto error; 424 } 425 pml->pml_map = list_pml->pml_map; 426 pml->pml_map.pm_vers = RPCBVERS4; 427 pml->pml_next = list_pml; 428 list_pml = pml; 429 430 /* Also add version 2 stuff to rpcbind list */ 431 rbllist_add(PMAPPROG, PMAPVERS, nconf, &taddr.addr); 432 } 433 #endif 434 435 /* version 3 registration */ 436 if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS, rpcb_service_3, NULL)) { 437 warn("Could not register %s version 3", nconf->nc_netid); 438 goto error; 439 } 440 rbllist_add(RPCBPROG, RPCBVERS, nconf, &taddr.addr); 441 442 /* version 4 registration */ 443 if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS4, rpcb_service_4, NULL)) { 444 warn("Could not register %s version 4", nconf->nc_netid); 445 goto error; 446 } 447 rbllist_add(RPCBPROG, RPCBVERS4, nconf, &taddr.addr); 448 449 /* decide if bound checking works for this transport */ 450 status = add_bndlist(nconf, &taddr.addr); 451 #ifdef RPCBIND_DEBUG 452 if (debugging) { 453 if (status < 0) { 454 fprintf(stderr, "Error in finding bind status for %s\n", 455 nconf->nc_netid); 456 } else if (status == 0) { 457 fprintf(stderr, "check binding for %s\n", 458 nconf->nc_netid); 459 } else if (status > 0) { 460 fprintf(stderr, "No check binding for %s\n", 461 nconf->nc_netid); 462 } 463 } 464 #endif 465 /* 466 * rmtcall only supported on CLTS transports for now. 467 */ 468 if (nconf->nc_semantics == NC_TPI_CLTS) { 469 status = create_rmtcall_fd(nconf); 470 471 #ifdef RPCBIND_DEBUG 472 if (debugging) { 473 if (status < 0) { 474 fprintf(stderr, 475 "Could not create rmtcall fd for %s\n", 476 nconf->nc_netid); 477 } else { 478 fprintf(stderr, "rmtcall fd for %s is %d\n", 479 nconf->nc_netid, status); 480 } 481 } 482 #endif 483 } 484 return (0); 485 error: 486 (void)close(fd); 487 return (1); 488 } 489 490 static void 491 rbllist_add(rpcprog_t prog, rpcvers_t vers, struct netconfig *nconf, 492 struct netbuf *addr) 493 { 494 rpcblist_ptr rbl; 495 496 rbl = malloc(sizeof(rpcblist)); 497 if (rbl == NULL) { 498 warn("Out of memory"); 499 return; 500 } 501 502 rbl->rpcb_map.r_prog = prog; 503 rbl->rpcb_map.r_vers = vers; 504 rbl->rpcb_map.r_netid = strdup(nconf->nc_netid); 505 rbl->rpcb_map.r_addr = taddr2uaddr(nconf, addr); 506 rbl->rpcb_map.r_owner = strdup(rpcbind_superuser); 507 rbl->rpcb_next = list_rbl; /* Attach to global list */ 508 list_rbl = rbl; 509 } 510 511 /* 512 * Catch the signal and die 513 */ 514 static void 515 terminate(int dummy) 516 { 517 #ifdef WARMSTART 518 syslog(LOG_ERR, 519 "rpcbind terminating on signal. Restart with \"rpcbind -w\""); 520 write_warmstart(); /* Dump yourself */ 521 #endif 522 exit(2); 523 } 524 525 void 526 rpcbind_abort() 527 { 528 #ifdef WARMSTART 529 write_warmstart(); /* Dump yourself */ 530 #endif 531 abort(); 532 } 533 534 /* get command line options */ 535 static void 536 parseargs(int argc, char *argv[]) 537 { 538 int c; 539 540 while ((c = getopt(argc, argv, "dwailLs")) != -1) { 541 switch (c) { 542 case 'a': 543 doabort = 1; /* when debugging, do an abort on */ 544 break; /* errors; for rpcbind developers */ 545 /* only! */ 546 case 'd': 547 debugging = 1; 548 break; 549 case 'i': 550 insecure = 1; 551 break; 552 case 'L': 553 oldstyle_local = 1; 554 break; 555 case 'l': 556 verboselog = 1; 557 break; 558 case 's': 559 runasdaemon = 1; 560 break; 561 #ifdef WARMSTART 562 case 'w': 563 warmstart = 1; 564 break; 565 #endif 566 default: /* error */ 567 fprintf(stderr, "usage: rpcbind [-Idwils]\n"); 568 exit (1); 569 } 570 } 571 if (doabort && !debugging) { 572 fprintf(stderr, 573 "-a (abort) specified without -d (debugging) -- ignored.\n"); 574 doabort = 0; 575 } 576 } 577 578 void 579 reap(int dummy) 580 { 581 int save_errno = errno; 582 583 while (wait3(NULL, WNOHANG, NULL) > 0) 584 ; 585 errno = save_errno; 586 } 587 588 void 589 toggle_verboselog(int dummy) 590 { 591 verboselog = !verboselog; 592 } 593