1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1995 5 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Bill Paul. 18 * 4. Neither the name of the author nor the names of any co-contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 /* 37 * ypserv startup function. 38 * We need out own main() since we have to do some additional work 39 * that rpcgen won't do for us. Most of this file was generated using 40 * rpcgen.new, and later modified. 41 */ 42 43 #include <sys/types.h> 44 #include <sys/mman.h> 45 #include <sys/queue.h> 46 #include <sys/socket.h> 47 #include <sys/wait.h> 48 #include "yp.h" 49 #include <err.h> 50 #include <errno.h> 51 #include <memory.h> 52 #include <stdio.h> 53 #include <signal.h> 54 #include <stdarg.h> 55 #include <stdlib.h> /* getenv, exit */ 56 #include <string.h> /* strcmp */ 57 #include <syslog.h> 58 #include <unistd.h> 59 #ifdef __cplusplus 60 #include <sysent.h> /* getdtablesize, open */ 61 #endif /* __cplusplus */ 62 #include <netinet/in.h> 63 #include <netdb.h> 64 #include "yp_extern.h" 65 #include <netconfig.h> 66 #include <rpc/rpc.h> 67 #include <rpc/rpc_com.h> 68 69 #ifndef SIG_PF 70 #define SIG_PF void(*)(int) 71 #endif 72 73 #define _RPCSVC_CLOSEDOWN 120 74 int _rpcpmstart; /* Started by a port monitor ? */ 75 static int _rpcfdtype; /* Whether Stream or Datagram? */ 76 static int _rpcaf; 77 static int _rpcfd; 78 79 /* States a server can be in wrt request */ 80 #define _IDLE 0 81 #define _SERVED 1 82 #define _SERVING 2 83 84 extern void ypprog_1(struct svc_req *, SVCXPRT *); 85 extern void ypprog_2(struct svc_req *, SVCXPRT *); 86 extern int _rpc_dtablesize(void); 87 extern int _rpcsvcstate; /* Set when a request is serviced */ 88 char *progname = "ypserv"; 89 char *yp_dir = _PATH_YP; 90 int debug; 91 int do_dns = 0; 92 int resfd; 93 94 struct socklistent { 95 int sle_sock; 96 struct sockaddr_storage sle_ss; 97 SLIST_ENTRY(socklistent) sle_next; 98 }; 99 static SLIST_HEAD(, socklistent) sle_head = 100 SLIST_HEAD_INITIALIZER(sle_head); 101 102 struct bindaddrlistent { 103 const char *ble_hostname; 104 SLIST_ENTRY(bindaddrlistent) ble_next; 105 }; 106 static SLIST_HEAD(, bindaddrlistent) ble_head = 107 SLIST_HEAD_INITIALIZER(ble_head); 108 109 static char *servname = "0"; 110 111 static 112 void _msgout(char* msg, ...) 113 { 114 va_list ap; 115 116 va_start(ap, msg); 117 if (debug) { 118 if (_rpcpmstart) 119 vsyslog(LOG_ERR, msg, ap); 120 else 121 vwarnx(msg, ap); 122 } else 123 vsyslog(LOG_ERR, msg, ap); 124 va_end(ap); 125 } 126 127 pid_t yp_pid; 128 129 static void 130 yp_svc_run(void) 131 { 132 #ifdef FD_SETSIZE 133 fd_set readfds; 134 #else 135 int readfds; 136 #endif /* def FD_SETSIZE */ 137 int fd_setsize = _rpc_dtablesize(); 138 struct timeval timeout; 139 140 /* Establish the identity of the parent ypserv process. */ 141 yp_pid = getpid(); 142 143 for (;;) { 144 #ifdef FD_SETSIZE 145 readfds = svc_fdset; 146 #else 147 readfds = svc_fds; 148 #endif /* def FD_SETSIZE */ 149 150 FD_SET(resfd, &readfds); 151 152 timeout.tv_sec = RESOLVER_TIMEOUT; 153 timeout.tv_usec = 0; 154 switch (select(fd_setsize, &readfds, NULL, NULL, 155 &timeout)) { 156 case -1: 157 if (errno == EINTR) { 158 continue; 159 } 160 warn("svc_run: - select failed"); 161 return; 162 case 0: 163 if (getpid() == yp_pid) 164 yp_prune_dnsq(); 165 break; 166 default: 167 if (getpid() == yp_pid) { 168 if (FD_ISSET(resfd, &readfds)) { 169 yp_run_dnsq(); 170 FD_CLR(resfd, &readfds); 171 } 172 svc_getreqset(&readfds); 173 } 174 } 175 if (yp_pid != getpid()) 176 _exit(0); 177 } 178 } 179 180 static void 181 unregister(void) 182 { 183 (void)svc_unreg(YPPROG, YPVERS); 184 (void)svc_unreg(YPPROG, YPOLDVERS); 185 } 186 187 static void 188 reaper(int sig) 189 { 190 int status; 191 int saved_errno; 192 193 saved_errno = errno; 194 195 if (sig == SIGHUP) { 196 load_securenets(); 197 #ifdef DB_CACHE 198 yp_flush_all(); 199 #endif 200 errno = saved_errno; 201 return; 202 } 203 204 if (sig == SIGCHLD) { 205 while (wait3(&status, WNOHANG, NULL) > 0) 206 children--; 207 } else { 208 unregister(); 209 exit(0); 210 } 211 errno = saved_errno; 212 return; 213 } 214 215 static void 216 usage(void) 217 { 218 fprintf(stderr, "usage: ypserv [-h addr] [-d] [-n] [-p path] [-P port]\n"); 219 exit(1); 220 } 221 222 static void 223 closedown(int sig) 224 { 225 if (_rpcsvcstate == _IDLE) { 226 extern fd_set svc_fdset; 227 static int size; 228 int i, openfd; 229 230 if (_rpcfdtype == SOCK_DGRAM) { 231 unregister(); 232 exit(0); 233 } 234 if (size == 0) { 235 size = getdtablesize(); 236 } 237 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 238 if (FD_ISSET(i, &svc_fdset)) 239 openfd++; 240 if (openfd <= 1) { 241 unregister(); 242 exit(0); 243 } 244 } 245 if (_rpcsvcstate == _SERVED) 246 _rpcsvcstate = _IDLE; 247 248 (void) signal(SIGALRM, (SIG_PF) closedown); 249 (void) alarm(_RPCSVC_CLOSEDOWN/2); 250 } 251 252 static int 253 create_service(const int sock, const struct netconfig *nconf, 254 const struct __rpc_sockinfo *si) 255 { 256 int error; 257 258 SVCXPRT *transp; 259 struct addrinfo hints, *res, *res0; 260 struct socklistent *slep; 261 struct bindaddrlistent *blep; 262 struct netbuf svcaddr; 263 264 SLIST_INIT(&sle_head); 265 memset(&hints, 0, sizeof(hints)); 266 memset(&svcaddr, 0, sizeof(svcaddr)); 267 268 hints.ai_family = si->si_af; 269 hints.ai_socktype = si->si_socktype; 270 hints.ai_protocol = si->si_proto; 271 272 /* 273 * Build socketlist from bindaddrlist. 274 */ 275 if (sock == RPC_ANYFD) { 276 SLIST_FOREACH(blep, &ble_head, ble_next) { 277 if (blep->ble_hostname == NULL) 278 hints.ai_flags = AI_PASSIVE; 279 else 280 hints.ai_flags = 0; 281 error = getaddrinfo(blep->ble_hostname, servname, 282 &hints, &res0); 283 if (error) { 284 _msgout("getaddrinfo(): %s", 285 gai_strerror(error)); 286 return -1; 287 } 288 for (res = res0; res; res = res->ai_next) { 289 int s; 290 291 s = __rpc_nconf2fd(nconf); 292 if (s < 0) { 293 if (errno == EAFNOSUPPORT) 294 _msgout("unsupported" 295 " transport: %s", 296 nconf->nc_netid); 297 else 298 _msgout("cannot create" 299 " %s socket: %s", 300 nconf->nc_netid, 301 strerror(errno)); 302 freeaddrinfo(res0); 303 return -1; 304 } 305 if (bindresvport_sa(s, res->ai_addr) == -1) { 306 if ((errno != EPERM) || 307 (bind(s, res->ai_addr, 308 res->ai_addrlen) == -1)) { 309 _msgout("cannot bind " 310 "%s socket: %s", 311 nconf->nc_netid, 312 strerror(errno)); 313 freeaddrinfo(res0); 314 close(sock); 315 return -1; 316 } 317 } 318 if (nconf->nc_semantics != NC_TPI_CLTS) 319 listen(s, SOMAXCONN); 320 321 slep = malloc(sizeof(*slep)); 322 if (slep == NULL) { 323 _msgout("malloc failed: %s", 324 strerror(errno)); 325 freeaddrinfo(res0); 326 close(s); 327 return -1; 328 } 329 memset(slep, 0, sizeof(*slep)); 330 memcpy(&slep->sle_ss, res->ai_addr, 331 res->ai_addrlen); 332 slep->sle_sock = s; 333 SLIST_INSERT_HEAD(&sle_head, slep, sle_next); 334 335 /* 336 * If servname == "0", redefine it by using 337 * the bound socket. 338 */ 339 if (strncmp("0", servname, 1) == 0) { 340 struct sockaddr *sap; 341 socklen_t slen; 342 char *sname; 343 344 sname = malloc(NI_MAXSERV); 345 if (sname == NULL) { 346 _msgout("malloc(): %s", 347 strerror(errno)); 348 freeaddrinfo(res0); 349 close(s); 350 return -1; 351 } 352 memset(sname, 0, NI_MAXSERV); 353 354 sap = (struct sockaddr *)&slep->sle_ss; 355 slen = sizeof(*sap); 356 error = getsockname(s, sap, &slen); 357 if (error) { 358 _msgout("getsockname(): %s", 359 strerror(errno)); 360 freeaddrinfo(res0); 361 close(s); 362 free(sname); 363 return -1; 364 } 365 error = getnameinfo(sap, slen, 366 NULL, 0, 367 sname, NI_MAXSERV, 368 NI_NUMERICHOST | NI_NUMERICSERV); 369 if (error) { 370 _msgout("getnameinfo(): %s", 371 strerror(errno)); 372 freeaddrinfo(res0); 373 close(s); 374 free(sname); 375 return -1; 376 } 377 servname = sname; 378 } 379 } 380 freeaddrinfo(res0); 381 } 382 } else { 383 slep = malloc(sizeof(*slep)); 384 if (slep == NULL) { 385 _msgout("malloc failed: %s", strerror(errno)); 386 return -1; 387 } 388 memset(slep, 0, sizeof(*slep)); 389 slep->sle_sock = sock; 390 SLIST_INSERT_HEAD(&sle_head, slep, sle_next); 391 } 392 393 /* 394 * Traverse socketlist and create rpc service handles for each socket. 395 */ 396 SLIST_FOREACH(slep, &sle_head, sle_next) { 397 if (nconf->nc_semantics == NC_TPI_CLTS) 398 transp = svc_dg_create(slep->sle_sock, 0, 0); 399 else 400 transp = svc_vc_create(slep->sle_sock, RPC_MAXDATASIZE, 401 RPC_MAXDATASIZE); 402 if (transp == NULL) { 403 _msgout("unable to create service: %s", 404 nconf->nc_netid); 405 continue; 406 } 407 if (!svc_reg(transp, YPPROG, YPOLDVERS, ypprog_1, NULL)) { 408 svc_destroy(transp); 409 close(slep->sle_sock); 410 _msgout("unable to register (YPPROG, YPOLDVERS, %s):" 411 " %s", nconf->nc_netid, strerror(errno)); 412 continue; 413 } 414 if (!svc_reg(transp, YPPROG, YPVERS, ypprog_2, NULL)) { 415 svc_destroy(transp); 416 close(slep->sle_sock); 417 _msgout("unable to register (YPPROG, YPVERS, %s): %s", 418 nconf->nc_netid, strerror(errno)); 419 continue; 420 } 421 } 422 while(!(SLIST_EMPTY(&sle_head))) 423 SLIST_REMOVE_HEAD(&sle_head, sle_next); 424 425 /* 426 * Register RPC service to rpcbind by using AI_PASSIVE address. 427 */ 428 hints.ai_flags = AI_PASSIVE; 429 error = getaddrinfo(NULL, servname, &hints, &res0); 430 if (error) { 431 _msgout("getaddrinfo(): %s", gai_strerror(error)); 432 return -1; 433 } 434 svcaddr.buf = res0->ai_addr; 435 svcaddr.len = res0->ai_addrlen; 436 437 if (si->si_af == AF_INET) { 438 /* XXX: ignore error intentionally */ 439 rpcb_set(YPPROG, YPOLDVERS, nconf, &svcaddr); 440 } 441 /* XXX: ignore error intentionally */ 442 rpcb_set(YPPROG, YPVERS, nconf, &svcaddr); 443 freeaddrinfo(res0); 444 return 0; 445 } 446 447 int 448 main(int argc, char *argv[]) 449 { 450 int ch; 451 int error; 452 int ntrans; 453 454 void *nc_handle; 455 struct netconfig *nconf; 456 struct __rpc_sockinfo si; 457 struct bindaddrlistent *blep; 458 459 memset(&si, 0, sizeof(si)); 460 SLIST_INIT(&ble_head); 461 462 while ((ch = getopt(argc, argv, "dh:np:P:")) != -1) { 463 switch (ch) { 464 case 'd': 465 debug = ypdb_debug = 1; 466 break; 467 case 'h': 468 blep = malloc(sizeof(*blep)); 469 if (blep == NULL) 470 err(1, "malloc() failed: -h %s", optarg); 471 blep->ble_hostname = optarg; 472 SLIST_INSERT_HEAD(&ble_head, blep, ble_next); 473 break; 474 case 'n': 475 do_dns = 1; 476 break; 477 case 'p': 478 yp_dir = optarg; 479 break; 480 case 'P': 481 servname = optarg; 482 break; 483 default: 484 usage(); 485 } 486 } 487 /* 488 * Add "anyaddr" entry if no -h is specified. 489 */ 490 if (SLIST_EMPTY(&ble_head)) { 491 blep = malloc(sizeof(*blep)); 492 if (blep == NULL) 493 err(1, "malloc() failed"); 494 memset(blep, 0, sizeof(*blep)); 495 SLIST_INSERT_HEAD(&ble_head, blep, ble_next); 496 } 497 498 load_securenets(); 499 yp_init_resolver(); 500 #ifdef DB_CACHE 501 yp_init_dbs(); 502 #endif 503 nc_handle = setnetconfig(); 504 if (nc_handle == NULL) 505 err(1, "cannot read %s", NETCONFIG); 506 if (__rpc_fd2sockinfo(0, &si) != 0) { 507 /* invoked from inetd */ 508 _rpcpmstart = 1; 509 _rpcfdtype = si.si_socktype; 510 _rpcaf = si.si_af; 511 _rpcfd = 0; 512 openlog("ypserv", LOG_PID, LOG_DAEMON); 513 } else { 514 /* standalone mode */ 515 if (!debug) { 516 if (daemon(0,0)) { 517 err(1,"cannot fork"); 518 } 519 openlog("ypserv", LOG_PID, LOG_DAEMON); 520 } 521 _rpcpmstart = 0; 522 _rpcaf = AF_INET; 523 _rpcfd = RPC_ANYFD; 524 unregister(); 525 } 526 527 if (madvise(NULL, 0, MADV_PROTECT) != 0) 528 _msgout("madvise(): %s", strerror(errno)); 529 530 /* 531 * Create RPC service for each transport. 532 */ 533 ntrans = 0; 534 while((nconf = getnetconfig(nc_handle))) { 535 if ((nconf->nc_flag & NC_VISIBLE)) { 536 if (__rpc_nconf2sockinfo(nconf, &si) == 0) { 537 _msgout("cannot get information for %s. " 538 "Ignored.", nconf->nc_netid); 539 continue; 540 } 541 if (_rpcpmstart) { 542 if (si.si_socktype != _rpcfdtype || 543 si.si_af != _rpcaf) 544 continue; 545 } else if (si.si_af != _rpcaf) 546 continue; 547 error = create_service(_rpcfd, nconf, &si); 548 if (error) { 549 endnetconfig(nc_handle); 550 exit(1); 551 } 552 ntrans++; 553 } 554 } 555 endnetconfig(nc_handle); 556 while(!(SLIST_EMPTY(&ble_head))) 557 SLIST_REMOVE_HEAD(&ble_head, ble_next); 558 if (ntrans == 0) { 559 _msgout("no transport is available. Aborted."); 560 exit(1); 561 } 562 if (_rpcpmstart) { 563 (void) signal(SIGALRM, (SIG_PF) closedown); 564 (void) alarm(_RPCSVC_CLOSEDOWN/2); 565 } 566 /* 567 * Make sure SIGPIPE doesn't blow us away while servicing TCP 568 * connections. 569 */ 570 (void) signal(SIGPIPE, SIG_IGN); 571 (void) signal(SIGCHLD, (SIG_PF) reaper); 572 (void) signal(SIGTERM, (SIG_PF) reaper); 573 (void) signal(SIGINT, (SIG_PF) reaper); 574 (void) signal(SIGHUP, (SIG_PF) reaper); 575 yp_svc_run(); 576 _msgout("svc_run returned"); 577 exit(1); 578 /* NOTREACHED */ 579 } 580