usr.sbin/ypserv/yp_main.c

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