rpcbind.c revision 1.7
1 /* $NetBSD: rpcbind.c,v 1.7 2004/05/20 12:22:23 martin 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 = errno == EPROTONOSUPPORT; 253 syslog(non_fatal?LOG_DEBUG:LOG_ERR, "cannot create socket for %s", nconf->nc_netid); 254 return (1); 255 } 256 257 if (!__rpc_nconf2sockinfo(nconf, &si)) { 258 syslog(LOG_ERR, "cannot get information for %s", 259 nconf->nc_netid); 260 return (1); 261 } 262 263 if (si.si_af == AF_INET6) { 264 /* 265 * We're doing host-based access checks here, so don't allow 266 * v4-in-v6 to confuse things. 267 */ 268 if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, 269 sizeof one) < 0) { 270 syslog(LOG_ERR, "can't make socket ipv6 only"); 271 return (1); 272 } 273 } 274 275 276 if (!strcmp(nconf->nc_netid, "local")) { 277 memset(&sun, 0, sizeof sun); 278 sun.sun_family = AF_LOCAL; 279 unlink(_PATH_RPCBINDSOCK); 280 strlcpy(sun.sun_path, _PATH_RPCBINDSOCK, sizeof(sun.sun_path)); 281 sun.sun_len = SUN_LEN(&sun); 282 addrlen = sizeof (struct sockaddr_un); 283 sa = (struct sockaddr *)&sun; 284 } else { 285 /* Get rpcbind's address on this transport */ 286 287 memset(&hints, 0, sizeof hints); 288 hints.ai_flags = AI_PASSIVE; 289 hints.ai_family = si.si_af; 290 hints.ai_socktype = si.si_socktype; 291 hints.ai_protocol = si.si_proto; 292 if ((aicode = getaddrinfo(NULL, servname, &hints, &res)) != 0) { 293 syslog(LOG_ERR, "cannot get local address for %s: %s", 294 nconf->nc_netid, gai_strerror(aicode)); 295 return 1; 296 } 297 addrlen = res->ai_addrlen; 298 sa = (struct sockaddr *)res->ai_addr; 299 } 300 301 if (bind(fd, sa, addrlen) < 0) { 302 syslog(LOG_ERR, "cannot bind %s: %m", nconf->nc_netid); 303 if (res != NULL) 304 freeaddrinfo(res); 305 return 1; 306 } 307 308 /* Copy the address */ 309 taddr.addr.len = taddr.addr.maxlen = addrlen; 310 taddr.addr.buf = malloc(addrlen); 311 if (taddr.addr.buf == NULL) { 312 syslog(LOG_ERR, "cannot allocate memory for %s address", 313 nconf->nc_netid); 314 if (res != NULL) 315 freeaddrinfo(res); 316 return 1; 317 } 318 memcpy(taddr.addr.buf, sa, addrlen); 319 #ifdef ND_DEBUG 320 if (debugging) { 321 /* for debugging print out our universal address */ 322 char *uaddr; 323 struct netbuf nb; 324 325 nb.buf = sa; 326 nb.len = nb.maxlen = sa->sa_len; 327 uaddr = taddr2uaddr(nconf, &nb); 328 (void) fprintf(stderr, "rpcbind : my address is %s\n", uaddr); 329 (void) free(uaddr); 330 } 331 #endif 332 333 if (res != NULL) 334 freeaddrinfo(res); 335 336 if (nconf->nc_semantics != NC_TPI_CLTS) 337 listen(fd, SOMAXCONN); 338 339 my_xprt = (SVCXPRT *)svc_tli_create(fd, nconf, &taddr, RPC_MAXDATASIZE, 340 RPC_MAXDATASIZE); 341 if (my_xprt == (SVCXPRT *)NULL) { 342 syslog(LOG_ERR, "%s: could not create service", 343 nconf->nc_netid); 344 goto error; 345 } 346 347 #ifdef PORTMAP 348 /* 349 * Register both the versions for tcp/ip, udp/ip and local. 350 */ 351 if ((strcmp(nconf->nc_protofmly, NC_INET) == 0 && 352 (strcmp(nconf->nc_proto, NC_TCP) == 0 || 353 strcmp(nconf->nc_proto, NC_UDP) == 0)) || 354 strcmp(nconf->nc_netid, "local") == 0) { 355 struct pmaplist *pml; 356 357 if (!svc_register(my_xprt, PMAPPROG, PMAPVERS, 358 pmap_service, 0)) { 359 syslog(LOG_ERR, "could not register on %s", 360 nconf->nc_netid); 361 goto error; 362 } 363 pml = (struct pmaplist *)malloc((u_int)sizeof (struct pmaplist)); 364 if (pml == (struct pmaplist *)NULL) { 365 syslog(LOG_ERR, "no memory!"); 366 exit(1); 367 } 368 pml->pml_map.pm_prog = PMAPPROG; 369 pml->pml_map.pm_vers = PMAPVERS; 370 pml->pml_map.pm_port = PMAPPORT; 371 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 372 if (tcptrans[0]) { 373 syslog(LOG_ERR, 374 "cannot have more than one TCP transport"); 375 goto error; 376 } 377 tcptrans = strdup(nconf->nc_netid); 378 pml->pml_map.pm_prot = IPPROTO_TCP; 379 380 /* Let's snarf the universal address */ 381 /* "h1.h2.h3.h4.p1.p2" */ 382 tcp_uaddr = taddr2uaddr(nconf, &taddr.addr); 383 } else if (strcmp(nconf->nc_proto, NC_UDP) == 0) { 384 if (udptrans[0]) { 385 syslog(LOG_ERR, 386 "cannot have more than one UDP transport"); 387 goto error; 388 } 389 udptrans = strdup(nconf->nc_netid); 390 pml->pml_map.pm_prot = IPPROTO_UDP; 391 392 /* Let's snarf the universal address */ 393 /* "h1.h2.h3.h4.p1.p2" */ 394 udp_uaddr = taddr2uaddr(nconf, &taddr.addr); 395 } 396 pml->pml_next = list_pml; 397 list_pml = pml; 398 399 /* Add version 3 information */ 400 pml = (struct pmaplist *)malloc((u_int)sizeof (struct pmaplist)); 401 if (pml == (struct pmaplist *)NULL) { 402 syslog(LOG_ERR, "no memory!"); 403 exit(1); 404 } 405 pml->pml_map = list_pml->pml_map; 406 pml->pml_map.pm_vers = RPCBVERS; 407 pml->pml_next = list_pml; 408 list_pml = pml; 409 410 /* Add version 4 information */ 411 pml = (struct pmaplist *)malloc((u_int)sizeof (struct pmaplist)); 412 if (pml == (struct pmaplist *)NULL) { 413 syslog(LOG_ERR, "no memory!"); 414 exit(1); 415 } 416 pml->pml_map = list_pml->pml_map; 417 pml->pml_map.pm_vers = RPCBVERS4; 418 pml->pml_next = list_pml; 419 list_pml = pml; 420 421 /* Also add version 2 stuff to rpcbind list */ 422 rbllist_add(PMAPPROG, PMAPVERS, nconf, &taddr.addr); 423 } 424 #endif 425 426 /* version 3 registration */ 427 if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS, rpcb_service_3, NULL)) { 428 syslog(LOG_ERR, "could not register %s version 3", 429 nconf->nc_netid); 430 goto error; 431 } 432 rbllist_add(RPCBPROG, RPCBVERS, nconf, &taddr.addr); 433 434 /* version 4 registration */ 435 if (!svc_reg(my_xprt, RPCBPROG, RPCBVERS4, rpcb_service_4, NULL)) { 436 syslog(LOG_ERR, "could not register %s version 4", 437 nconf->nc_netid); 438 goto error; 439 } 440 rbllist_add(RPCBPROG, RPCBVERS4, nconf, &taddr.addr); 441 442 /* decide if bound checking works for this transport */ 443 status = add_bndlist(nconf, &taddr.addr); 444 #ifdef BIND_DEBUG 445 if (debugging) { 446 if (status < 0) { 447 fprintf(stderr, "Error in finding bind status for %s\n", 448 nconf->nc_netid); 449 } else if (status == 0) { 450 fprintf(stderr, "check binding for %s\n", 451 nconf->nc_netid); 452 } else if (status > 0) { 453 fprintf(stderr, "No check binding for %s\n", 454 nconf->nc_netid); 455 } 456 } 457 #endif 458 /* 459 * rmtcall only supported on CLTS transports for now. 460 */ 461 if (nconf->nc_semantics == NC_TPI_CLTS) { 462 status = create_rmtcall_fd(nconf); 463 464 #ifdef BIND_DEBUG 465 if (debugging) { 466 if (status < 0) { 467 fprintf(stderr, 468 "Could not create rmtcall fd for %s\n", 469 nconf->nc_netid); 470 } else { 471 fprintf(stderr, "rmtcall fd for %s is %d\n", 472 nconf->nc_netid, status); 473 } 474 } 475 #endif 476 } 477 return (0); 478 error: 479 close(fd); 480 return (1); 481 } 482 483 static void 484 rbllist_add(rpcprog_t prog, rpcvers_t vers, struct netconfig *nconf, 485 struct netbuf *addr) 486 { 487 rpcblist_ptr rbl; 488 489 rbl = (rpcblist_ptr)malloc((u_int)sizeof (rpcblist)); 490 if (rbl == (rpcblist_ptr)NULL) { 491 syslog(LOG_ERR, "no memory!"); 492 exit(1); 493 } 494 495 rbl->rpcb_map.r_prog = prog; 496 rbl->rpcb_map.r_vers = vers; 497 rbl->rpcb_map.r_netid = strdup(nconf->nc_netid); 498 rbl->rpcb_map.r_addr = taddr2uaddr(nconf, addr); 499 rbl->rpcb_map.r_owner = strdup(superuser); 500 rbl->rpcb_next = list_rbl; /* Attach to global list */ 501 list_rbl = rbl; 502 } 503 504 /* 505 * Catch the signal and die 506 */ 507 static void 508 terminate(int dummy) 509 { 510 #ifdef WARMSTART 511 syslog(LOG_ERR, 512 "rpcbind terminating on signal. Restart with \"rpcbind -w\""); 513 write_warmstart(); /* Dump yourself */ 514 #endif 515 exit(2); 516 } 517 518 void 519 rpcbind_abort() 520 { 521 #ifdef WARMSTART 522 write_warmstart(); /* Dump yourself */ 523 #endif 524 abort(); 525 } 526 527 /* get command line options */ 528 static void 529 parseargs(int argc, char *argv[]) 530 { 531 int c; 532 533 while ((c = getopt(argc, argv, "dwailLs")) != -1) { 534 switch (c) { 535 case 'a': 536 doabort = 1; /* when debugging, do an abort on */ 537 break; /* errors; for rpcbind developers */ 538 /* only! */ 539 case 'd': 540 debugging = 1; 541 break; 542 case 'i': 543 insecure = 1; 544 break; 545 case 'L': 546 oldstyle_local = 1; 547 break; 548 case 'l': 549 verboselog = 1; 550 break; 551 case 's': 552 runasdaemon = 1; 553 break; 554 #ifdef WARMSTART 555 case 'w': 556 warmstart = 1; 557 break; 558 #endif 559 default: /* error */ 560 fprintf(stderr, "usage: rpcbind [-Idwils]\n"); 561 exit (1); 562 } 563 } 564 if (doabort && !debugging) { 565 fprintf(stderr, 566 "-a (abort) specified without -d (debugging) -- ignored.\n"); 567 doabort = 0; 568 } 569 } 570 571 void 572 reap(int dummy) 573 { 574 int save_errno = errno; 575 576 while (wait3(NULL, WNOHANG, NULL) > 0) 577 ; 578 errno = save_errno; 579 } 580 581 void 582 toggle_verboselog(int dummy) 583 { 584 verboselog = !verboselog; 585 } 586
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