1 /* $NetBSD: rpcbind.c,v 1.9 2006/06/14 16:25:17 ginsbach 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 char *udptrans; /* Name of UDP transport */ 96 char *tcptrans; /* Name of TCP transport */ 97 char *udp_uaddr; /* Universal UDP address */ 98 char *tcp_uaddr; /* Universal TCP address */ 99 #endif 100 static char servname[] = "rpcbind"; 101 static char superuser[] = "superuser"; 102 103 int main __P((int, char *[])); 104 105 static int init_transport __P((struct netconfig *)); 106 static void rbllist_add __P((rpcprog_t, rpcvers_t, struct netconfig *, 107 struct netbuf *)); 108 static void terminate __P((int)); 109 static void parseargs __P((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 openlog("rpcbind", 0, LOG_DAEMON); 130 if (geteuid()) { /* This command allowed only to root */ 131 fprintf(stderr, "Sorry. You are not superuser\n"); 132 exit(1); 133 } 134 nc_handle = setnetconfig(); /* open netconfig file */ 135 if (nc_handle == NULL) { 136 syslog(LOG_ERR, "could not read /etc/netconfig"); 137 exit(1); 138 } 139 #ifdef PORTMAP 140 udptrans = ""; 141 tcptrans = ""; 142 #endif 143 144 nconf = getnetconfigent("local"); 145 if (nconf == NULL) { 146 syslog(LOG_ERR, "%s: can't find local transport\n", argv[0]); 147 exit(1); 148 } 149 150 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec); 151 152 init_transport(nconf); 153 154 while ((nconf = getnetconfig(nc_handle))) { 155 if (nconf->nc_flag & NC_VISIBLE) 156 init_transport(nconf); 157 } 158 endnetconfig(nc_handle); 159 160 /* catch the usual termination signals for graceful exit */ 161 (void) signal(SIGCHLD, reap); 162 (void) signal(SIGINT, terminate); 163 (void) signal(SIGTERM, terminate); 164 (void) signal(SIGQUIT, terminate); 165 /* ignore others that could get sent */ 166 (void) signal(SIGPIPE, SIG_IGN); 167 (void) signal(SIGHUP, SIG_IGN); 168 (void) signal(SIGUSR1, SIG_IGN); 169 (void) signal(SIGUSR2, SIG_IGN); 170 #ifdef WARMSTART 171 if (warmstart) { 172 read_warmstart(); 173 } 174 #endif 175 if (debugging) { 176 printf("rpcbind debugging enabled."); 177 if (doabort) { 178 printf(" Will abort on errors!\n"); 179 } else { 180 printf("\n"); 181 } 182 } else { 183 if (daemon(0, 0)) 184 err(1, "fork failed"); 185 } 186 pidfile(NULL); 187 188 if (runasdaemon) { 189 struct passwd *p; 190 191 if((p = getpwnam(RUN_AS)) == NULL) { 192 syslog(LOG_ERR, "cannot get uid of daemon: %m"); 193 exit(1); 194 } 195 if (setuid(p->pw_uid) == -1) { 196 syslog(LOG_ERR, "setuid to daemon failed: %m"); 197 exit(1); 198 } 199 } 200 201 network_init(); 202 203 my_svc_run(); 204 syslog(LOG_ERR, "svc_run returned unexpectedly"); 205 rpcbind_abort(); 206 /* NOTREACHED */ 207 208 return 0; 209 } 210 211 /* 212 * Adds the entry into the rpcbind database. 213 * If PORTMAP, then for UDP and TCP, it adds the entries for version 2 also 214 * Returns 0 if succeeds, else fails 215 */ 216 static int 217 init_transport(struct netconfig *nconf) 218 { 219 int fd; 220 struct t_bind taddr; 221 struct addrinfo hints, *res = NULL; 222 struct __rpc_sockinfo si; 223 SVCXPRT *my_xprt; 224 int status; /* bound checking ? */ 225 int aicode; 226 int addrlen; 227 struct sockaddr *sa; 228 struct sockaddr_un sun; 229 const int one = 1; 230 231 if ((nconf->nc_semantics != NC_TPI_CLTS) && 232 (nconf->nc_semantics != NC_TPI_COTS) && 233 (nconf->nc_semantics != NC_TPI_COTS_ORD)) 234 return (1); /* not my type */ 235 #ifdef ND_DEBUG 236 if (debugging) { 237 int i; 238 char **s; 239 240 (void) fprintf(stderr, "%s: %ld lookup routines :\n", 241 nconf->nc_netid, nconf->nc_nlookups); 242 for (i = 0, s = nconf->nc_lookups; i < nconf->nc_nlookups; 243 i++, s++) 244 fprintf(stderr, "[%d] - %s\n", i, *s); 245 } 246 #endif 247 248 /* 249 * XXX - using RPC library internal functions. 250 */ 251 if ((fd = __rpc_nconf2fd(nconf)) < 0) { 252 int non_fatal; 253 254 non_fatal = (errno == EAFNOSUPPORT || errno == EPROTONOSUPPORT); 255 syslog(non_fatal?LOG_DEBUG:LOG_ERR, 256 "cannot create socket for %s", nconf->nc_netid); 257 return (1); 258 } 259 260 if (!__rpc_nconf2sockinfo(nconf, &si)) { 261 syslog(LOG_ERR, "cannot get information for %s", 262 nconf->nc_netid); 263 return (1); 264 } 265 266 if (si.si_af == AF_INET6) { 267 /* 268 * We're doing host-based access checks here, so don't allow 269 * v4-in-v6 to confuse things. 270 */ 271 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, 272 sizeof one) < 0) { 273 syslog(LOG_ERR, "can't make socket ipv6 only"); 274 return (1); 275 } 276 } 277 278 279 if (!strcmp(nconf->nc_netid, "local")) { 280 memset(&sun, 0, sizeof sun); 281 sun.sun_family = AF_LOCAL; 282 unlink(_PATH_RPCBINDSOCK); 283 strlcpy(sun.sun_path, _PATH_RPCBINDSOCK, sizeof(sun.sun_path)); 284 sun.sun_len = SUN_LEN(&sun); 285 addrlen = sizeof (struct sockaddr_un); 286 sa = (struct sockaddr *)&sun; 287 } else { 288 /* Get rpcbind's address on this transport */ 289 290 memset(&hints, 0, sizeof hints); 291 hints.ai_flags = AI_PASSIVE; 292 hints.ai_family = si.si_af; 293 hints.ai_socktype = si.si_socktype; 294 hints.ai_protocol = si.si_proto; 295 if ((aicode = getaddrinfo(NULL, servname, &hints, &res)) != 0) { 296 syslog(LOG_ERR, "cannot get local address for %s: %s", 297 nconf->nc_netid, gai_strerror(aicode)); 298 return 1; 299 } 300 addrlen = res->ai_addrlen; 301 sa = (struct sockaddr *)res->ai_addr; 302 } 303 304 if (bind(fd, sa, addrlen) < 0) { 305 syslog(LOG_ERR, "cannot bind %s: %m", nconf->nc_netid); 306 if (res != NULL) 307 freeaddrinfo(res); 308 return 1; 309 } 310 311 /* Copy the address */ 312 taddr.addr.len = taddr.addr.maxlen = addrlen; 313 taddr.addr.buf = malloc(addrlen); 314 if (taddr.addr.buf == NULL) { 315 syslog(LOG_ERR, "cannot allocate memory for %s address", 316 nconf->nc_netid); 317 if (res != NULL) 318 freeaddrinfo(res); 319 return 1; 320 } 321 memcpy(taddr.addr.buf, sa, addrlen); 322 #ifdef ND_DEBUG 323 if (debugging) { 324 /* for debugging print out our universal address */ 325 char *uaddr; 326 struct netbuf nb; 327 328 nb.buf = sa; 329 nb.len = nb.maxlen = sa->sa_len; 330 uaddr = taddr2uaddr(nconf, &nb); 331 (void) fprintf(stderr, "rpcbind : my address is %s\n", uaddr); 332 (void) free(uaddr); 333 } 334 #endif 335 336 if (res != NULL) 337 freeaddrinfo(res); 338 339 if (nconf->nc_semantics != NC_TPI_CLTS) 340 listen(fd, SOMAXCONN); 341 342 my_xprt = (SVCXPRT *)svc_tli_create(fd, nconf, &taddr, RPC_MAXDATASIZE, 343 RPC_MAXDATASIZE); 344 if (my_xprt == (SVCXPRT *)NULL) { 345 syslog(LOG_ERR, "%s: could not create service", 346 nconf->nc_netid); 347 goto error; 348 } 349 350 #ifdef PORTMAP 351 /* 352 * Register both the versions for tcp/ip, udp/ip and local. 353 */ 354 if ((strcmp(nconf->nc_protofmly, NC_INET) == 0 && 355 (strcmp(nconf->nc_proto, NC_TCP) == 0 || 356 strcmp(nconf->nc_proto, NC_UDP) == 0)) || 357 strcmp(nconf->nc_netid, "local") == 0) { 358 struct pmaplist *pml; 359 360 if (!svc_register(my_xprt, PMAPPROG, PMAPVERS, 361 pmap_service, 0)) { 362 syslog(LOG_ERR, "could not register on %s", 363 nconf->nc_netid); 364 goto error; 365 } 366 pml = malloc(sizeof (struct pmaplist)); 367 if (pml == NULL) { 368 syslog(LOG_ERR, "no memory!"); 369 exit(1); 370 } 371 pml->pml_map.pm_prog = PMAPPROG; 372 pml->pml_map.pm_vers = PMAPVERS; 373 pml->pml_map.pm_port = PMAPPORT; 374 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 375 if (tcptrans[0]) { 376 syslog(LOG_ERR, 377 "cannot have more than one TCP transport"); 378 free(pml); 379 goto error; 380 } 381 tcptrans = strdup(nconf->nc_netid); 382 pml->pml_map.pm_prot = IPPROTO_TCP; 383 384 /* Let's snarf the universal address */ 385 /* "h1.h2.h3.h4.p1.p2" */ 386 tcp_uaddr = taddr2uaddr(nconf, &taddr.addr); 387 } else if (strcmp(nconf->nc_proto, NC_UDP) == 0) { 388 if (udptrans[0]) { 389 syslog(LOG_ERR, 390 "cannot have more than one UDP transport"); 391 goto error; 392 } 393 udptrans = strdup(nconf->nc_netid); 394 pml->pml_map.pm_prot = IPPROTO_UDP; 395 396 /* Let's snarf the universal address */ 397 /* "h1.h2.h3.h4.p1.p2" */ 398 udp_uaddr = taddr2uaddr(nconf, &taddr.addr); 399 } 400 pml->pml_next = list_pml; 401 list_pml = pml; 402 403 /* Add version 3 information */ 404 pml = malloc(sizeof (struct pmaplist)); 405 if (pml == NULL) { 406 syslog(LOG_ERR, "no memory!"); 407 exit(1); 408 } 409 pml->pml_map = list_pml->pml_map; 410 pml->pml_map.pm_vers = RPCBVERS; 411 pml->pml_next = list_pml; 412 list_pml = pml; 413 414 /* Add version 4 information */ 415 pml = malloc(sizeof (struct pmaplist)); 416 if (pml == NULL) { 417 syslog(LOG_ERR, "no memory!"); 418 exit(1); 419 } 420 pml->pml_map = list_pml->pml_map; 421 pml->pml_map.pm_vers = RPCBVERS4; 422 pml->pml_next = list_pml; 423 list_pml = pml; 424 425 /* Also add version 2 stuff to rpcbind list */ 426 rbllist_add(PMAPPROG, PMAPVERS, nconf, &taddr.addr); 427 } 428 #endif 429 430 /* version 3 registration */ 431 if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS, rpcb_service_3, NULL)) { 432 syslog(LOG_ERR, "could not register %s version 3", 433 nconf->nc_netid); 434 goto error; 435 } 436 rbllist_add(RPCBPROG, RPCBVERS, nconf, &taddr.addr); 437 438 /* version 4 registration */ 439 if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS4, rpcb_service_4, NULL)) { 440 syslog(LOG_ERR, "could not register %s version 4", 441 nconf->nc_netid); 442 goto error; 443 } 444 rbllist_add(RPCBPROG, RPCBVERS4, nconf, &taddr.addr); 445 446 /* decide if bound checking works for this transport */ 447 status = add_bndlist(nconf, &taddr.addr); 448 #ifdef BIND_DEBUG 449 if (debugging) { 450 if (status < 0) { 451 fprintf(stderr, "Error in finding bind status for %s\n", 452 nconf->nc_netid); 453 } else if (status == 0) { 454 fprintf(stderr, "check binding for %s\n", 455 nconf->nc_netid); 456 } else if (status > 0) { 457 fprintf(stderr, "No check binding for %s\n", 458 nconf->nc_netid); 459 } 460 } 461 #endif 462 /* 463 * rmtcall only supported on CLTS transports for now. 464 */ 465 if (nconf->nc_semantics == NC_TPI_CLTS) { 466 status = create_rmtcall_fd(nconf); 467 468 #ifdef BIND_DEBUG 469 if (debugging) { 470 if (status < 0) { 471 fprintf(stderr, 472 "Could not create rmtcall fd for %s\n", 473 nconf->nc_netid); 474 } else { 475 fprintf(stderr, "rmtcall fd for %s is %d\n", 476 nconf->nc_netid, status); 477 } 478 } 479 #endif 480 } 481 return (0); 482 error: 483 close(fd); 484 return (1); 485 } 486 487 static void 488 rbllist_add(rpcprog_t prog, rpcvers_t vers, struct netconfig *nconf, 489 struct netbuf *addr) 490 { 491 rpcblist_ptr rbl; 492 493 rbl = malloc(sizeof(rpcblist)); 494 if (rbl == NULL) { 495 syslog(LOG_ERR, "no memory!"); 496 exit(1); 497 } 498 499 rbl->rpcb_map.r_prog = prog; 500 rbl->rpcb_map.r_vers = vers; 501 rbl->rpcb_map.r_netid = strdup(nconf->nc_netid); 502 rbl->rpcb_map.r_addr = taddr2uaddr(nconf, addr); 503 rbl->rpcb_map.r_owner = strdup(superuser); 504 rbl->rpcb_next = list_rbl; /* Attach to global list */ 505 list_rbl = rbl; 506 } 507 508 /* 509 * Catch the signal and die 510 */ 511 static void 512 terminate(int dummy) 513 { 514 #ifdef WARMSTART 515 syslog(LOG_ERR, 516 "rpcbind terminating on signal. Restart with \"rpcbind -w\""); 517 write_warmstart(); /* Dump yourself */ 518 #endif 519 exit(2); 520 } 521 522 void 523 rpcbind_abort() 524 { 525 #ifdef WARMSTART 526 write_warmstart(); /* Dump yourself */ 527 #endif 528 abort(); 529 } 530 531 /* get command line options */ 532 static void 533 parseargs(int argc, char *argv[]) 534 { 535 int c; 536 537 while ((c = getopt(argc, argv, "dwailLs")) != -1) { 538 switch (c) { 539 case 'a': 540 doabort = 1; /* when debugging, do an abort on */ 541 break; /* errors; for rpcbind developers */ 542 /* only! */ 543 case 'd': 544 debugging = 1; 545 break; 546 case 'i': 547 insecure = 1; 548 break; 549 case 'L': 550 oldstyle_local = 1; 551 break; 552 case 'l': 553 verboselog = 1; 554 break; 555 case 's': 556 runasdaemon = 1; 557 break; 558 #ifdef WARMSTART 559 case 'w': 560 warmstart = 1; 561 break; 562 #endif 563 default: /* error */ 564 fprintf(stderr, "usage: rpcbind [-Idwils]\n"); 565 exit (1); 566 } 567 } 568 if (doabort && !debugging) { 569 fprintf(stderr, 570 "-a (abort) specified without -d (debugging) -- ignored.\n"); 571 doabort = 0; 572 } 573 } 574 575 void 576 reap(int dummy) 577 { 578 int save_errno = errno; 579 580 while (wait3(NULL, WNOHANG, NULL) > 0) 581 ; 582 errno = save_errno; 583 } 584 585 void 586 toggle_verboselog(int dummy) 587 { 588 verboselog = !verboselog; 589 } 590