usr.sbin/nfsd/nfsd.c

   1 /*
   2  * Copyright (c) 1989, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Rick Macklem at The University of Guelph.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #ifndef lint
  38 static const char copyright[] =
  39 "@(#) Copyright (c) 1989, 1993, 1994\n\
  40         The Regents of the University of California.  All rights reserved.\n";
  41 #endif /* not lint */
  42
  43 #ifndef lint
  44 #if 0
  45 static char sccsid[] = "@(#)nfsd.c      8.9 (Berkeley) 3/29/95";
  46 #endif
  47 static const char rcsid[] =
  48   "$FreeBSD$";
  49 #endif /* not lint */
  50
  51 #include <sys/param.h>
  52 #include <sys/syslog.h>
  53 #include <sys/wait.h>
  54 #include <sys/mount.h>
  55 #include <sys/linker.h>
  56 #include <sys/module.h>
  57
  58 #include <rpc/rpc.h>
  59 #include <rpc/pmap_clnt.h>
  60
  61 #include <netdb.h>
  62 #include <arpa/inet.h>
  63 #include <nfs/rpcv2.h>
  64 #include <nfs/nfsproto.h>
  65 #include <nfsserver/nfs.h>
  66
  67 #include <err.h>
  68 #include <errno.h>
  69 #include <signal.h>
  70 #include <stdio.h>
  71 #include <stdlib.h>
  72 #include <string.h>
  73 #include <unistd.h>
  74 #include <netdb.h>
  75
  76 /* Global defs */
  77 #ifdef DEBUG
  78 #define syslog(e, s...) fprintf(stderr,s)
  79 int     debug = 1;
  80 #else
  81 int     debug = 0;
  82 #endif
  83
  84 #define MAXNFSDCNT      20
  85 #define DEFNFSDCNT       4
  86 pid_t   children[MAXNFSDCNT];   /* PIDs of children */
  87 int     nfsdcnt;                /* number of children */
  88
  89 void    cleanup(int);
  90 void    child_cleanup(int);
  91 void    killchildren(void);
  92 void    nfsd_exit(int);
  93 void    nonfs(int);
  94 void    reapchild(int);
  95 int     setbindhost(struct addrinfo **ia, const char *bindhost,
  96             struct addrinfo hints);
  97 void    start_server(int);
  98 void    unregistration(void);
  99 void    usage(void);
 100
 101 /*
 102  * Nfs server daemon mostly just a user context for nfssvc()
 103  *
 104  * 1 - do file descriptor and signal cleanup
 105  * 2 - fork the nfsd(s)
 106  * 3 - create server socket(s)
 107  * 4 - register socket with rpcbind
 108  *
 109  * For connectionless protocols, just pass the socket into the kernel via.
 110  * nfssvc().
 111  * For connection based sockets, loop doing accepts. When you get a new
 112  * socket from accept, pass the msgsock into the kernel via. nfssvc().
 113  * The arguments are:
 114  *      -r - reregister with rpcbind
 115  *      -d - unregister with rpcbind
 116  *      -t - support tcp nfs clients
 117  *      -u - support udp nfs clients
 118  * followed by "n" which is the number of nfsds' to fork off
 119  */
 120 int
 121 main(argc, argv, envp)
 122         int argc;
 123         char *argv[], *envp[];
 124 {
 125         struct nfsd_args nfsdargs;
 126         struct addrinfo *ai_udp, *ai_tcp, *ai_udp6, *ai_tcp6, hints;
 127         struct netconfig *nconf_udp, *nconf_tcp, *nconf_udp6, *nconf_tcp6;
 128         struct netbuf nb_udp, nb_tcp, nb_udp6, nb_tcp6;
 129         struct sockaddr_in inetpeer;
 130         struct sockaddr_in6 inet6peer;
 131         fd_set ready, sockbits;
 132         fd_set v4bits, v6bits;
 133         int ch, connect_type_cnt, i, len, maxsock, msgsock;
 134         int on = 1, unregister, reregister, sock;
 135         int tcp6sock, ip6flag, tcpflag, tcpsock;
 136         int udpflag, ecode, s, srvcnt;
 137         int bindhostc, bindanyflag, rpcbreg, rpcbregcnt;
 138         char **bindhost = NULL;
 139         pid_t pid;
 140
 141         if (modfind("nfsserver") < 0) {
 142                 /* Not present in kernel, try loading it */
 143                 if (kldload("nfsserver") < 0 || modfind("nfsserver") < 0)
 144                         errx(1, "NFS server is not available");
 145         }
 146
 147         nfsdcnt = DEFNFSDCNT;
 148         unregister = reregister = tcpflag = maxsock = 0;
 149         bindanyflag = udpflag = connect_type_cnt = bindhostc = 0;
 150 #define GETOPT  "ah:n:rdtu"
 151 #define USAGE   "[-ardtu] [-n num_servers] [-h bindip]"
 152         while ((ch = getopt(argc, argv, GETOPT)) != -1)
 153                 switch (ch) {
 154                 case 'a':
 155                         bindanyflag = 1;
 156                         break;
 157                 case 'n':
 158                         nfsdcnt = atoi(optarg);
 159                         if (nfsdcnt < 1 || nfsdcnt > MAXNFSDCNT) {
 160                                 warnx("nfsd count %d; reset to %d", nfsdcnt,
 161                                     DEFNFSDCNT);
 162                                 nfsdcnt = DEFNFSDCNT;
 163                         }
 164                         break;
 165                 case 'h':
 166                         bindhostc++;
 167                         bindhost = realloc(bindhost,sizeof(char *)*bindhostc);
 168                         if (bindhost == NULL)
 169                                 errx(1, "Out of memory");
 170                         bindhost[bindhostc-1] = strdup(optarg);
 171                         if (bindhost[bindhostc-1] == NULL)
 172                                 errx(1, "Out of memory");
 173                         break;
 174                 case 'r':
 175                         reregister = 1;
 176                         break;
 177                 case 'd':
 178                         unregister = 1;
 179                         break;
 180                 case 't':
 181                         tcpflag = 1;
 182                         break;
 183                 case 'u':
 184                         udpflag = 1;
 185                         break;
 186                 default:
 187                 case '?':
 188                         usage();
 189                 };
 190         if (!tcpflag && !udpflag)
 191                 udpflag = 1;
 192         argv += optind;
 193         argc -= optind;
 194
 195         /*
 196          * XXX
 197          * Backward compatibility, trailing number is the count of daemons.
 198          */
 199         if (argc > 1)
 200                 usage();
 201         if (argc == 1) {
 202                 nfsdcnt = atoi(argv[0]);
 203                 if (nfsdcnt < 1 || nfsdcnt > MAXNFSDCNT) {
 204                         warnx("nfsd count %d; reset to %d", nfsdcnt,
 205                             DEFNFSDCNT);
 206                         nfsdcnt = DEFNFSDCNT;
 207                 }
 208         }
 209
 210         ip6flag = 1;
 211         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 212         if (s == -1) {
 213                 if (errno != EPROTONOSUPPORT)
 214                         err(1, "socket");
 215                 ip6flag = 0;
 216         } else if (getnetconfigent("udp6") == NULL ||
 217                 getnetconfigent("tcp6") == NULL) {
 218                 ip6flag = 0;
 219         }
 220         if (s != -1)
 221                 close(s);
 222
 223         if (bindhostc == 0 || bindanyflag) {
 224                 bindhostc++;
 225                 bindhost = realloc(bindhost,sizeof(char *)*bindhostc);
 226                 if (bindhost == NULL)
 227                         errx(1, "Out of memory");
 228                 bindhost[bindhostc-1] = strdup("*");
 229                 if (bindhost[bindhostc-1] == NULL)
 230                         errx(1, "Out of memory");
 231         }
 232
 233         if (unregister) {
 234                 unregistration();
 235                 exit (0);
 236         }
 237         if (reregister) {
 238                 if (udpflag) {
 239                         memset(&hints, 0, sizeof hints);
 240                         hints.ai_flags = AI_PASSIVE;
 241                         hints.ai_family = AF_INET;
 242                         hints.ai_socktype = SOCK_DGRAM;
 243                         hints.ai_protocol = IPPROTO_UDP;
 244                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp);
 245                         if (ecode != 0)
 246                                 err(1, "getaddrinfo udp: %s", gai_strerror(ecode));
 247                         nconf_udp = getnetconfigent("udp");
 248                         if (nconf_udp == NULL)
 249                                 err(1, "getnetconfigent udp failed");
 250                         nb_udp.buf = ai_udp->ai_addr;
 251                         nb_udp.len = nb_udp.maxlen = ai_udp->ai_addrlen;
 252                         if ((!rpcb_set(RPCPROG_NFS, 2, nconf_udp, &nb_udp)) ||
 253                             (!rpcb_set(RPCPROG_NFS, 3, nconf_udp, &nb_udp)))
 254                                 err(1, "rpcb_set udp failed");
 255                         freeaddrinfo(ai_udp);
 256                 }
 257                 if (udpflag && ip6flag) {
 258                         memset(&hints, 0, sizeof hints);
 259                         hints.ai_flags = AI_PASSIVE;
 260                         hints.ai_family = AF_INET6;
 261                         hints.ai_socktype = SOCK_DGRAM;
 262                         hints.ai_protocol = IPPROTO_UDP;
 263                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp6);
 264                         if (ecode != 0)
 265                                 err(1, "getaddrinfo udp6: %s", gai_strerror(ecode));
 266                         nconf_udp6 = getnetconfigent("udp6");
 267                         if (nconf_udp6 == NULL)
 268                                 err(1, "getnetconfigent udp6 failed");
 269                         nb_udp6.buf = ai_udp6->ai_addr;
 270                         nb_udp6.len = nb_udp6.maxlen = ai_udp6->ai_addrlen;
 271                         if ((!rpcb_set(RPCPROG_NFS, 2, nconf_udp6, &nb_udp6)) ||
 272                             (!rpcb_set(RPCPROG_NFS, 3, nconf_udp6, &nb_udp6)))
 273                                 err(1, "rpcb_set udp6 failed");
 274                         freeaddrinfo(ai_udp6);
 275                 }
 276                 if (tcpflag) {
 277                         memset(&hints, 0, sizeof hints);
 278                         hints.ai_flags = AI_PASSIVE;
 279                         hints.ai_family = AF_INET;
 280                         hints.ai_socktype = SOCK_STREAM;
 281                         hints.ai_protocol = IPPROTO_TCP;
 282                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp);
 283                         if (ecode != 0)
 284                                 err(1, "getaddrinfo tcp: %s", gai_strerror(ecode));
 285                         nconf_tcp = getnetconfigent("tcp");
 286                         if (nconf_tcp == NULL)
 287                                 err(1, "getnetconfigent tcp failed");
 288                         nb_tcp.buf = ai_tcp->ai_addr;
 289                         nb_tcp.len = nb_tcp.maxlen = ai_tcp->ai_addrlen;
 290                         if ((!rpcb_set(RPCPROG_NFS, 2, nconf_tcp, &nb_tcp)) ||
 291                             (!rpcb_set(RPCPROG_NFS, 3, nconf_tcp, &nb_tcp)))
 292                                 err(1, "rpcb_set tcp failed");
 293                         freeaddrinfo(ai_tcp);
 294                 }
 295                 if (tcpflag && ip6flag) {
 296                         memset(&hints, 0, sizeof hints);
 297                         hints.ai_flags = AI_PASSIVE;
 298                         hints.ai_family = AF_INET6;
 299                         hints.ai_socktype = SOCK_STREAM;
 300                         hints.ai_protocol = IPPROTO_TCP;
 301                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp6);
 302                         if (ecode != 0)
 303                                 err(1, "getaddrinfo tcp6: %s", gai_strerror(ecode));
 304                         nconf_tcp6 = getnetconfigent("tcp6");
 305                         if (nconf_tcp6 == NULL)
 306                                 err(1, "getnetconfigent tcp6 failed");
 307                         nb_tcp6.buf = ai_tcp6->ai_addr;
 308                         nb_tcp6.len = nb_tcp6.maxlen = ai_tcp6->ai_addrlen;
 309                         if ((!rpcb_set(RPCPROG_NFS, 2, nconf_tcp6, &nb_tcp6)) ||
 310                             (!rpcb_set(RPCPROG_NFS, 3, nconf_tcp6, &nb_tcp6)))
 311                                 err(1, "rpcb_set tcp6 failed");
 312                         freeaddrinfo(ai_tcp6);
 313                 }
 314                 exit (0);
 315         }
 316         if (debug == 0) {
 317                 daemon(0, 0);
 318                 (void)signal(SIGHUP, SIG_IGN);
 319                 (void)signal(SIGINT, SIG_IGN);
 320                 /*
 321                  * nfsd sits in the kernel most of the time.  It needs
 322                  * to ignore SIGTERM/SIGQUIT in order to stay alive as long
 323                  * as possible during a shutdown, otherwise loopback
 324                  * mounts will not be able to unmount.
 325                  */
 326                 (void)signal(SIGTERM, SIG_IGN);
 327                 (void)signal(SIGQUIT, SIG_IGN);
 328         }
 329         (void)signal(SIGSYS, nonfs);
 330         (void)signal(SIGCHLD, reapchild);
 331
 332         openlog("nfsd", LOG_PID, LOG_DAEMON);
 333
 334         /* If we use UDP only, we start the last server below. */
 335         srvcnt = tcpflag ? nfsdcnt : nfsdcnt - 1;
 336         for (i = 0; i < srvcnt; i++) {
 337                 switch ((pid = fork())) {
 338                 case -1:
 339                         syslog(LOG_ERR, "fork: %m");
 340                         nfsd_exit(1);
 341                 case 0:
 342                         break;
 343                 default:
 344                         children[i] = pid;
 345                         continue;
 346                 }
 347                 (void)signal(SIGUSR1, child_cleanup);
 348                 setproctitle("server");
 349
 350                 start_server(0);
 351         }
 352
 353         (void)signal(SIGUSR1, cleanup);
 354         FD_ZERO(&v4bits);
 355         FD_ZERO(&v6bits);
 356         FD_ZERO(&sockbits);
 357
 358         rpcbregcnt = 0;
 359         /* Set up the socket for udp and rpcb register it. */
 360         if (udpflag) {
 361                 rpcbreg = 0;
 362                 for (i = 0; i < bindhostc; i++) {
 363                         memset(&hints, 0, sizeof hints);
 364                         hints.ai_flags = AI_PASSIVE;
 365                         hints.ai_family = AF_INET;
 366                         hints.ai_socktype = SOCK_DGRAM;
 367                         hints.ai_protocol = IPPROTO_UDP;
 368                         if (setbindhost(&ai_udp, bindhost[i], hints) == 0) {
 369                                 rpcbreg = 1;
 370                                 rpcbregcnt++;
 371                                 if ((sock = socket(ai_udp->ai_family,
 372                                     ai_udp->ai_socktype,
 373                                     ai_udp->ai_protocol)) < 0) {
 374                                         syslog(LOG_ERR,
 375                                             "can't create udp socket");
 376                                         nfsd_exit(1);
 377                                 }
 378                                 if (bind(sock, ai_udp->ai_addr,
 379                                     ai_udp->ai_addrlen) < 0) {
 380                                         syslog(LOG_ERR,
 381                                             "can't bind udp addr %s: %m",
 382                                             bindhost[i]);
 383                                         nfsd_exit(1);
 384                                 }
 385                                 freeaddrinfo(ai_udp);
 386                                 nfsdargs.sock = sock;
 387                                 nfsdargs.name = NULL;
 388                                 nfsdargs.namelen = 0;
 389                                 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) {
 390                                         syslog(LOG_ERR, "can't Add UDP socket");
 391                                         nfsd_exit(1);
 392                                 }
 393                                 (void)close(sock);
 394                         }
 395                 }
 396                 if (rpcbreg == 1) {
 397                         memset(&hints, 0, sizeof hints);
 398                         hints.ai_flags = AI_PASSIVE;
 399                         hints.ai_family = AF_INET;
 400                         hints.ai_socktype = SOCK_DGRAM;
 401                         hints.ai_protocol = IPPROTO_UDP;
 402                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp);
 403                         if (ecode != 0) {
 404                                 syslog(LOG_ERR, "getaddrinfo udp: %s",
 405                                    gai_strerror(ecode));
 406                                 nfsd_exit(1);
 407                         }
 408                         nconf_udp = getnetconfigent("udp");
 409                         if (nconf_udp == NULL)
 410                                 err(1, "getnetconfigent udp failed");
 411                         nb_udp.buf = ai_udp->ai_addr;
 412                         nb_udp.len = nb_udp.maxlen = ai_udp->ai_addrlen;
 413                         if ((!rpcb_set(RPCPROG_NFS, 2, nconf_udp, &nb_udp)) ||
 414                             (!rpcb_set(RPCPROG_NFS, 3, nconf_udp, &nb_udp)))
 415                                 err(1, "rpcb_set udp failed");
 416                         freeaddrinfo(ai_udp);
 417                 }
 418         }
 419
 420         /* Set up the socket for udp6 and rpcb register it. */
 421         if (udpflag && ip6flag) {
 422                 rpcbreg = 0;
 423                 for (i = 0; i < bindhostc; i++) {
 424                         memset(&hints, 0, sizeof hints);
 425                         hints.ai_flags = AI_PASSIVE;
 426                         hints.ai_family = AF_INET6;
 427                         hints.ai_socktype = SOCK_DGRAM;
 428                         hints.ai_protocol = IPPROTO_UDP;
 429                         if (setbindhost(&ai_udp6, bindhost[i], hints) == 0) {
 430                                 rpcbreg = 1;
 431                                 rpcbregcnt++;
 432                                 if ((sock = socket(ai_udp6->ai_family,
 433                                     ai_udp6->ai_socktype,
 434                                     ai_udp6->ai_protocol)) < 0) {
 435                                         syslog(LOG_ERR,
 436                                                 "can't create udp6 socket");
 437                                         nfsd_exit(1);
 438                                 }
 439                                 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
 440                                     &on, sizeof on) < 0) {
 441                                         syslog(LOG_ERR,
 442                                             "can't set v6-only binding for "
 443                                             "udp6 socket: %m");
 444                                         nfsd_exit(1);
 445                                 }
 446                                 if (bind(sock, ai_udp6->ai_addr,
 447                                     ai_udp6->ai_addrlen) < 0) {
 448                                         syslog(LOG_ERR,
 449                                             "can't bind udp6 addr %s: %m",
 450                                             bindhost[i]);
 451                                         nfsd_exit(1);
 452                                 }
 453                                 freeaddrinfo(ai_udp6);
 454                                 nfsdargs.sock = sock;
 455                                 nfsdargs.name = NULL;
 456                                 nfsdargs.namelen = 0;
 457                                 if (nfssvc(NFSSVC_ADDSOCK, &nfsdargs) < 0) {
 458                                         syslog(LOG_ERR,
 459                                             "can't add UDP6 socket");
 460                                         nfsd_exit(1);
 461                                 }
 462                                 (void)close(sock);
 463                         }
 464                 }
 465                 if (rpcbreg == 1) {
 466                         memset(&hints, 0, sizeof hints);
 467                         hints.ai_flags = AI_PASSIVE;
 468                         hints.ai_family = AF_INET6;
 469                         hints.ai_socktype = SOCK_DGRAM;
 470                         hints.ai_protocol = IPPROTO_UDP;
 471                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp6);
 472                         if (ecode != 0) {
 473                                 syslog(LOG_ERR, "getaddrinfo udp6: %s",
 474                                    gai_strerror(ecode));
 475                                 nfsd_exit(1);
 476                         }
 477                         nconf_udp6 = getnetconfigent("udp6");
 478                         if (nconf_udp6 == NULL)
 479                                 err(1, "getnetconfigent udp6 failed");
 480                         nb_udp6.buf = ai_udp6->ai_addr;
 481                         nb_udp6.len = nb_udp6.maxlen = ai_udp6->ai_addrlen;
 482                         if ((!rpcb_set(RPCPROG_NFS, 2, nconf_udp6, &nb_udp6)) ||
 483                             (!rpcb_set(RPCPROG_NFS, 3, nconf_udp6, &nb_udp6)))
 484                                 err(1, "rpcb_set udp6 failed");
 485                         freeaddrinfo(ai_udp6);
 486                 }
 487         }
 488
 489         /* Set up the socket for tcp and rpcb register it. */
 490         if (tcpflag) {
 491                 rpcbreg = 0;
 492                 for (i = 0; i < bindhostc; i++) {
 493                         memset(&hints, 0, sizeof hints);
 494                         hints.ai_flags = AI_PASSIVE;
 495                         hints.ai_family = AF_INET;
 496                         hints.ai_socktype = SOCK_STREAM;
 497                         hints.ai_protocol = IPPROTO_TCP;
 498                         if (setbindhost(&ai_tcp, bindhost[i], hints) == 0) {
 499                                 rpcbreg = 1;
 500                                 rpcbregcnt++;
 501                                 if ((tcpsock = socket(AF_INET, SOCK_STREAM,
 502                                     0)) < 0) {
 503                                         syslog(LOG_ERR,
 504                                             "can't create tpc socket");
 505                                         nfsd_exit(1);
 506                                 }
 507                                 if (setsockopt(tcpsock, SOL_SOCKET,
 508                                     SO_REUSEADDR,
 509                                     (char *)&on, sizeof(on)) < 0)
 510                                         syslog(LOG_ERR,
 511                                              "setsockopt SO_REUSEADDR: %m");
 512                                 if (bind(tcpsock, ai_tcp->ai_addr,
 513                                     ai_tcp->ai_addrlen) < 0) {
 514                                         syslog(LOG_ERR,
 515                                             "can't bind tcp addr %s: %m",
 516                                             bindhost[i]);
 517                                         nfsd_exit(1);
 518                                 }
 519                                 if (listen(tcpsock, 5) < 0) {
 520                                         syslog(LOG_ERR, "listen failed");
 521                                         nfsd_exit(1);
 522                                 }
 523                                 freeaddrinfo(ai_tcp);
 524                                 FD_SET(tcpsock, &sockbits);
 525                                 FD_SET(tcpsock, &v4bits);
 526                                 maxsock = tcpsock;
 527                                 connect_type_cnt++;
 528                         }
 529                 }
 530                 if (rpcbreg == 1) {
 531                         memset(&hints, 0, sizeof hints);
 532                         hints.ai_flags = AI_PASSIVE;
 533                         hints.ai_family = AF_INET;
 534                         hints.ai_socktype = SOCK_STREAM;
 535                         hints.ai_protocol = IPPROTO_TCP;
 536                         ecode = getaddrinfo(NULL, "nfs", &hints,
 537                              &ai_tcp);
 538                         if (ecode != 0) {
 539                                 syslog(LOG_ERR, "getaddrinfo tcp: %s",
 540                                    gai_strerror(ecode));
 541                                 nfsd_exit(1);
 542                         }
 543                         nconf_tcp = getnetconfigent("tcp");
 544                         if (nconf_tcp == NULL)
 545                                 err(1, "getnetconfigent tcp failed");
 546                         nb_tcp.buf = ai_tcp->ai_addr;
 547                         nb_tcp.len = nb_tcp.maxlen = ai_tcp->ai_addrlen;
 548                         if ((!rpcb_set(RPCPROG_NFS, 2, nconf_tcp,
 549                             &nb_tcp)) || (!rpcb_set(RPCPROG_NFS, 3,
 550                             nconf_tcp, &nb_tcp)))
 551                                 err(1, "rpcb_set tcp failed");
 552                         freeaddrinfo(ai_tcp);
 553                 }
 554         }
 555
 556         /* Set up the socket for tcp6 and rpcb register it. */
 557         if (tcpflag && ip6flag) {
 558                 rpcbreg = 0;
 559                 for (i = 0; i < bindhostc; i++) {
 560                         memset(&hints, 0, sizeof hints);
 561                         hints.ai_flags = AI_PASSIVE;
 562                         hints.ai_family = AF_INET6;
 563                         hints.ai_socktype = SOCK_STREAM;
 564                         hints.ai_protocol = IPPROTO_TCP;
 565                         if (setbindhost(&ai_tcp6, bindhost[i], hints) == 0) {
 566                                 rpcbreg = 1;
 567                                 rpcbregcnt++;
 568                                 if ((tcp6sock = socket(ai_tcp6->ai_family,
 569                                     ai_tcp6->ai_socktype,
 570                                     ai_tcp6->ai_protocol)) < 0) {
 571                                         syslog(LOG_ERR,
 572                                             "can't create tcp6 socket");
 573                                         nfsd_exit(1);
 574                                 }
 575                                 if (setsockopt(tcp6sock, SOL_SOCKET,
 576                                     SO_REUSEADDR,
 577                                     (char *)&on, sizeof(on)) < 0)
 578                                         syslog(LOG_ERR,
 579                                             "setsockopt SO_REUSEADDR: %m");
 580                                 if (setsockopt(tcp6sock, IPPROTO_IPV6,
 581                                     IPV6_V6ONLY, &on, sizeof on) < 0) {
 582                                         syslog(LOG_ERR,
 583                                         "can't set v6-only binding for tcp6 "
 584                                             "socket: %m");
 585                                         nfsd_exit(1);
 586                                 }
 587                                 if (bind(tcp6sock, ai_tcp6->ai_addr,
 588                                     ai_tcp6->ai_addrlen) < 0) {
 589                                         syslog(LOG_ERR,
 590                                             "can't bind tcp6 addr %s: %m",
 591                                             bindhost[i]);
 592                                         nfsd_exit(1);
 593                                 }
 594                                 if (listen(tcp6sock, 5) < 0) {
 595                                         syslog(LOG_ERR, "listen failed");
 596                                         nfsd_exit(1);
 597                                 }
 598                                 freeaddrinfo(ai_tcp6);
 599                                 FD_SET(tcp6sock, &sockbits);
 600                                 FD_SET(tcp6sock, &v6bits);
 601                                 if (maxsock < tcp6sock)
 602                                         maxsock = tcp6sock;
 603                                 connect_type_cnt++;
 604                         }
 605                 }
 606                 if (rpcbreg == 1) {
 607                         memset(&hints, 0, sizeof hints);
 608                         hints.ai_flags = AI_PASSIVE;
 609                         hints.ai_family = AF_INET6;
 610                         hints.ai_socktype = SOCK_STREAM;
 611                         hints.ai_protocol = IPPROTO_TCP;
 612                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp6);
 613                         if (ecode != 0) {
 614                                 syslog(LOG_ERR, "getaddrinfo tcp6: %s",
 615                                    gai_strerror(ecode));
 616                                 nfsd_exit(1);
 617                         }
 618                         nconf_tcp6 = getnetconfigent("tcp6");
 619                         if (nconf_tcp6 == NULL)
 620                                 err(1, "getnetconfigent tcp6 failed");
 621                         nb_tcp6.buf = ai_tcp6->ai_addr;
 622                         nb_tcp6.len = nb_tcp6.maxlen = ai_tcp6->ai_addrlen;
 623                         if ((!rpcb_set(RPCPROG_NFS, 2, nconf_tcp6, &nb_tcp6)) ||
 624                             (!rpcb_set(RPCPROG_NFS, 3, nconf_tcp6, &nb_tcp6)))
 625                                 err(1, "rpcb_set tcp6 failed");
 626                         freeaddrinfo(ai_tcp6);
 627                 }
 628         }
 629
 630         if (rpcbregcnt == 0) {
 631                 syslog(LOG_ERR, "rpcb_set() failed, nothing to do: %m");
 632                 nfsd_exit(1);
 633         }
 634
 635         if (tcpflag && connect_type_cnt == 0) {
 636                 syslog(LOG_ERR, "tcp connects == 0, nothing to do: %m");
 637                 nfsd_exit(1);
 638         }
 639
 640         setproctitle("master");
 641         /*
 642          * We always want a master to have a clean way to to shut nfsd down
 643          * (with unregistration): if the master is killed, it unregisters and
 644          * kills all children. If we run for UDP only (and so do not have to
 645          * loop waiting waiting for accept), we instead make the parent
 646          * a "server" too. start_server will not return.
 647          */
 648         if (!tcpflag)
 649                 start_server(1);
 650
 651         /*
 652          * Loop forever accepting connections and passing the sockets
 653          * into the kernel for the mounts.
 654          */
 655         for (;;) {
 656                 ready = sockbits;
 657                 if (connect_type_cnt > 1) {
 658                         if (select(maxsock + 1,
 659                             &ready, NULL, NULL, NULL) < 1) {
 660                                 syslog(LOG_ERR, "select failed: %m");
 661                                 nfsd_exit(1);
 662                         }
 663                 }
 664                 for (tcpsock = 0; tcpsock <= maxsock; tcpsock++) {
 665                         if (FD_ISSET(tcpsock, &ready)) {
 666                                 if (FD_ISSET(tcpsock, &v4bits)) {
 667                                         len = sizeof(inetpeer);
 668                                         if ((msgsock = accept(tcpsock,
 669                                             (struct sockaddr *)&inetpeer, &len)) < 0) {
 670                                                 syslog(LOG_ERR, "accept failed: %m");
 671                                                 nfsd_exit(1);
 672                                         }
 673                                         memset(inetpeer.sin_zero, 0,
 674                                                 sizeof(inetpeer.sin_zero));
 675                                         if (setsockopt(msgsock, SOL_SOCKET,
 676                                             SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0)
 677                                                 syslog(LOG_ERR,
 678                                                     "setsockopt SO_KEEPALIVE: %m");
 679                                         nfsdargs.sock = msgsock;
 680                                         nfsdargs.name = (caddr_t)&inetpeer;
 681                                         nfsdargs.namelen = len;
 682                                         nfssvc(NFSSVC_ADDSOCK, &nfsdargs);
 683                                         (void)close(msgsock);
 684                                 } else if (FD_ISSET(tcpsock, &v6bits)) {
 685                                         len = sizeof(inet6peer);
 686                                         if ((msgsock = accept(tcpsock,
 687                                             (struct sockaddr *)&inet6peer,
 688                                             &len)) < 0) {
 689                                                 syslog(LOG_ERR,
 690                                                      "accept failed: %m");
 691                                                 nfsd_exit(1);
 692                                         }
 693                                         if (setsockopt(msgsock, SOL_SOCKET,
 694                                             SO_KEEPALIVE, (char *)&on,
 695                                             sizeof(on)) < 0)
 696                                                 syslog(LOG_ERR, "setsockopt "
 697                                                     "SO_KEEPALIVE: %m");
 698                                         nfsdargs.sock = msgsock;
 699                                         nfsdargs.name = (caddr_t)&inet6peer;
 700                                         nfsdargs.namelen = len;
 701                                         nfssvc(NFSSVC_ADDSOCK, &nfsdargs);
 702                                         (void)close(msgsock);
 703                                 }
 704                         }
 705                 }
 706         }
 707 }
 708
 709 int
 710 setbindhost(struct addrinfo **ai, const char *bindhost, struct addrinfo hints)
 711 {
 712         int ecode;
 713         u_int32_t host_addr[4];  /* IPv4 or IPv6 */
 714         const char *hostptr;
 715
 716         if (bindhost == NULL || strcmp("*", bindhost) == 0)
 717                 hostptr = NULL;
 718         else
 719                 hostptr = bindhost;
 720
 721         if (hostptr != NULL) {
 722                 switch (hints.ai_family) {
 723                 case AF_INET:
 724                         if (inet_pton(AF_INET, hostptr, host_addr) == 1) {
 725                                 hints.ai_flags = AI_NUMERICHOST;
 726                         } else {
 727                                 if (inet_pton(AF_INET6, hostptr,
 728                                     host_addr) == 1)
 729                                         return (1);
 730                         }
 731                         break;
 732                 case AF_INET6:
 733                         if (inet_pton(AF_INET6, hostptr, host_addr) == 1) {
 734                                 hints.ai_flags = AI_NUMERICHOST;
 735                         } else {
 736                                 if (inet_pton(AF_INET, hostptr,
 737                                     host_addr) == 1)
 738                                         return (1);
 739                         }
 740                         break;
 741                 default:
 742                         break;
 743                 }
 744         }
 745
 746         ecode = getaddrinfo(hostptr, "nfs", &hints, ai);
 747         if (ecode != 0) {
 748                 syslog(LOG_ERR, "getaddrinfo %s: %s", bindhost,
 749                     gai_strerror(ecode));
 750                 return (1);
 751         }
 752         return (0);
 753 }
 754
 755 void
 756 usage()
 757 {
 758         (void)fprintf(stderr, "usage: nfsd %s\n", USAGE);
 759         exit(1);
 760 }
 761
 762 void
 763 nonfs(signo)
 764         int signo;
 765 {
 766         syslog(LOG_ERR, "missing system call: NFS not available");
 767 }
 768
 769 void
 770 reapchild(signo)
 771         int signo;
 772 {
 773         pid_t pid;
 774         int i;
 775
 776         while ((pid = wait3(NULL, WNOHANG, NULL)) > 0) {
 777                 for (i = 0; i < nfsdcnt; i++)
 778                         if (pid == children[i])
 779                                 children[i] = -1;
 780         }
 781 }
 782
 783 void
 784 unregistration()
 785 {
 786         if ((!rpcb_unset(RPCPROG_NFS, 2, NULL)) ||
 787             (!rpcb_unset(RPCPROG_NFS, 3, NULL)))
 788                 syslog(LOG_ERR, "rpcb_unset failed");
 789 }
 790
 791 void
 792 killchildren()
 793 {
 794         int i;
 795
 796         for (i = 0; i < nfsdcnt; i++) {
 797                 if (children[i] > 0)
 798                         kill(children[i], SIGKILL);
 799         }
 800 }
 801
 802 /*
 803  * Cleanup master after SIGUSR1.
 804  */
 805 void
 806 cleanup(signo)
 807 {
 808         nfsd_exit(0);
 809 }
 810
 811 /*
 812  * Cleanup child after SIGUSR1.
 813  */
 814 void
 815 child_cleanup(signo)
 816 {
 817         exit(0);
 818 }
 819
 820 void
 821 nfsd_exit(int status)
 822 {
 823         killchildren();
 824         unregistration();
 825         exit(status);
 826 }
 827
 828 void
 829 start_server(int master)
 830 {
 831         int status;
 832
 833         status = 0;
 834         if (nfssvc(NFSSVC_NFSD, NULL) < 0) {
 835                 syslog(LOG_ERR, "nfssvc: %m");
 836                 status = 1;
 837         }
 838         if (master)
 839                 nfsd_exit(status);
 840         else
 841                 exit(status);
 842 }