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  * 4. Neither the name of the University nor the names of its 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 THE REGENTS 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 THE REGENTS 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 #ifndef lint
  34 static const char copyright[] =
  35 "@(#) Copyright (c) 1989, 1993, 1994\n\
  36         The Regents of the University of California.  All rights reserved.\n";
  37 #endif /* not lint */
  38
  39 #ifndef lint
  40 #if 0
  41 static char sccsid[] = "@(#)nfsd.c      8.9 (Berkeley) 3/29/95";
  42 #endif
  43 static const char rcsid[] =
  44   "$FreeBSD$";
  45 #endif /* not lint */
  46
  47 #include <sys/param.h>
  48 #include <sys/syslog.h>
  49 #include <sys/wait.h>
  50 #include <sys/mount.h>
  51 #include <sys/fcntl.h>
  52 #include <sys/linker.h>
  53 #include <sys/module.h>
  54
  55 #include <rpc/rpc.h>
  56 #include <rpc/pmap_clnt.h>
  57 #include <rpcsvc/nfs_prot.h>
  58
  59 #include <netdb.h>
  60 #include <arpa/inet.h>
  61 #include <nfsserver/nfs.h>
  62 #include <nfs/nfssvc.h>
  63
  64 #include <err.h>
  65 #include <errno.h>
  66 #include <signal.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #include <unistd.h>
  71 #include <netdb.h>
  72
  73 /* Global defs */
  74 #ifdef DEBUG
  75 #define syslog(e, s...) fprintf(stderr,s)
  76 int     debug = 1;
  77 #else
  78 int     debug = 0;
  79 #endif
  80
  81 #define NFSD_STABLERESTART      "/var/db/nfs-stablerestart"
  82 #define MAXNFSDCNT      256
  83 #define DEFNFSDCNT       4
  84 pid_t   children[MAXNFSDCNT];   /* PIDs of children */
  85 int     nfsdcnt;                /* number of children */
  86 int     new_syscall;
  87 int     run_v4server = 0;       /* Force running of nfsv4 server */
  88 int     nfssvc_nfsd;            /* Set to correct NFSSVC_xxx flag */
  89
  90 void    cleanup(int);
  91 void    child_cleanup(int);
  92 void    killchildren(void);
  93 void    nfsd_exit(int);
  94 void    nonfs(int);
  95 void    reapchild(int);
  96 int     setbindhost(struct addrinfo **ia, const char *bindhost,
  97             struct addrinfo hints);
  98 void    start_server(int);
  99 void    unregistration(void);
 100 void    usage(void);
 101
 102 /*
 103  * Nfs server daemon mostly just a user context for nfssvc()
 104  *
 105  * 1 - do file descriptor and signal cleanup
 106  * 2 - fork the nfsd(s)
 107  * 3 - create server socket(s)
 108  * 4 - register socket with rpcbind
 109  *
 110  * For connectionless protocols, just pass the socket into the kernel via.
 111  * nfssvc().
 112  * For connection based sockets, loop doing accepts. When you get a new
 113  * socket from accept, pass the msgsock into the kernel via. nfssvc().
 114  * The arguments are:
 115  *      -r - reregister with rpcbind
 116  *      -d - unregister with rpcbind
 117  *      -t - support tcp nfs clients
 118  *      -u - support udp nfs clients
 119  *      -e - forces it to run a server that supports nfsv4
 120  * followed by "n" which is the number of nfsds' to fork off
 121  */
 122 int
 123 main(int argc, char **argv)
 124 {
 125         struct nfsd_addsock_args addsockargs;
 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, maxsock, msgsock;
 134         socklen_t len;
 135         int on = 1, unregister, reregister, sock;
 136         int tcp6sock, ip6flag, tcpflag, tcpsock;
 137         int udpflag, ecode, error, s, srvcnt;
 138         int bindhostc, bindanyflag, rpcbreg, rpcbregcnt;
 139         int stablefd, nfssvc_addsock;
 140         char **bindhost = NULL;
 141         pid_t pid;
 142
 143         nfsdcnt = DEFNFSDCNT;
 144         unregister = reregister = tcpflag = maxsock = 0;
 145         bindanyflag = udpflag = connect_type_cnt = bindhostc = 0;
 146 #define GETOPT  "ah:n:rdtue"
 147 #define USAGE   "[-ardtue] [-n num_servers] [-h bindip]"
 148         while ((ch = getopt(argc, argv, GETOPT)) != -1)
 149                 switch (ch) {
 150                 case 'a':
 151                         bindanyflag = 1;
 152                         break;
 153                 case 'n':
 154                         nfsdcnt = atoi(optarg);
 155                         if (nfsdcnt < 1 || nfsdcnt > MAXNFSDCNT) {
 156                                 warnx("nfsd count %d; reset to %d", nfsdcnt,
 157                                     DEFNFSDCNT);
 158                                 nfsdcnt = DEFNFSDCNT;
 159                         }
 160                         break;
 161                 case 'h':
 162                         bindhostc++;
 163                         bindhost = realloc(bindhost,sizeof(char *)*bindhostc);
 164                         if (bindhost == NULL)
 165                                 errx(1, "Out of memory");
 166                         bindhost[bindhostc-1] = strdup(optarg);
 167                         if (bindhost[bindhostc-1] == NULL)
 168                                 errx(1, "Out of memory");
 169                         break;
 170                 case 'r':
 171                         reregister = 1;
 172                         break;
 173                 case 'd':
 174                         unregister = 1;
 175                         break;
 176                 case 't':
 177                         tcpflag = 1;
 178                         break;
 179                 case 'u':
 180                         udpflag = 1;
 181                         break;
 182                 case 'e':
 183                         run_v4server = 1;
 184                         break;
 185                 default:
 186                 case '?':
 187                         usage();
 188                 };
 189         if (!tcpflag && !udpflag)
 190                 udpflag = 1;
 191         argv += optind;
 192         argc -= optind;
 193
 194         /*
 195          * XXX
 196          * Backward compatibility, trailing number is the count of daemons.
 197          */
 198         if (argc > 1)
 199                 usage();
 200         if (argc == 1) {
 201                 nfsdcnt = atoi(argv[0]);
 202                 if (nfsdcnt < 1 || nfsdcnt > MAXNFSDCNT) {
 203                         warnx("nfsd count %d; reset to %d", nfsdcnt,
 204                             DEFNFSDCNT);
 205                         nfsdcnt = DEFNFSDCNT;
 206                 }
 207         }
 208
 209         /*
 210          * If the "-e" option was specified OR only the nfsd module is
 211          * found in the server, run "nfsd".
 212          * Otherwise, try and run "nfsserver".
 213          */
 214         if (run_v4server > 0) {
 215                 if (modfind("nfsd") < 0) {
 216                         /* Not present in kernel, try loading it */
 217                         if (kldload("nfsd") < 0 || modfind("nfsd") < 0)
 218                                 errx(1, "NFS server is not available");
 219                 }
 220         } else if (modfind("nfsserver") < 0 && modfind("nfsd") >= 0) {
 221                 run_v4server = 1;
 222         } else if (modfind("nfsserver") < 0) {
 223                 /* Not present in kernel, try loading it */
 224                 if (kldload("nfsserver") < 0 || modfind("nfsserver") < 0)
 225                         errx(1, "NFS server is not available");
 226         }
 227
 228         ip6flag = 1;
 229         s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
 230         if (s == -1) {
 231                 if (errno != EPROTONOSUPPORT)
 232                         err(1, "socket");
 233                 ip6flag = 0;
 234         } else if (getnetconfigent("udp6") == NULL ||
 235                 getnetconfigent("tcp6") == NULL) {
 236                 ip6flag = 0;
 237         }
 238         if (s != -1)
 239                 close(s);
 240
 241         if (bindhostc == 0 || bindanyflag) {
 242                 bindhostc++;
 243                 bindhost = realloc(bindhost,sizeof(char *)*bindhostc);
 244                 if (bindhost == NULL)
 245                         errx(1, "Out of memory");
 246                 bindhost[bindhostc-1] = strdup("*");
 247                 if (bindhost[bindhostc-1] == NULL)
 248                         errx(1, "Out of memory");
 249         }
 250
 251         if (unregister) {
 252                 unregistration();
 253                 exit (0);
 254         }
 255         if (reregister) {
 256                 if (udpflag) {
 257                         memset(&hints, 0, sizeof hints);
 258                         hints.ai_flags = AI_PASSIVE;
 259                         hints.ai_family = AF_INET;
 260                         hints.ai_socktype = SOCK_DGRAM;
 261                         hints.ai_protocol = IPPROTO_UDP;
 262                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp);
 263                         if (ecode != 0)
 264                                 err(1, "getaddrinfo udp: %s", gai_strerror(ecode));
 265                         nconf_udp = getnetconfigent("udp");
 266                         if (nconf_udp == NULL)
 267                                 err(1, "getnetconfigent udp failed");
 268                         nb_udp.buf = ai_udp->ai_addr;
 269                         nb_udp.len = nb_udp.maxlen = ai_udp->ai_addrlen;
 270                         if ((!rpcb_set(NFS_PROGRAM, 2, nconf_udp, &nb_udp)) ||
 271                             (!rpcb_set(NFS_PROGRAM, 3, nconf_udp, &nb_udp)))
 272                                 err(1, "rpcb_set udp failed");
 273                         freeaddrinfo(ai_udp);
 274                 }
 275                 if (udpflag && ip6flag) {
 276                         memset(&hints, 0, sizeof hints);
 277                         hints.ai_flags = AI_PASSIVE;
 278                         hints.ai_family = AF_INET6;
 279                         hints.ai_socktype = SOCK_DGRAM;
 280                         hints.ai_protocol = IPPROTO_UDP;
 281                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp6);
 282                         if (ecode != 0)
 283                                 err(1, "getaddrinfo udp6: %s", gai_strerror(ecode));
 284                         nconf_udp6 = getnetconfigent("udp6");
 285                         if (nconf_udp6 == NULL)
 286                                 err(1, "getnetconfigent udp6 failed");
 287                         nb_udp6.buf = ai_udp6->ai_addr;
 288                         nb_udp6.len = nb_udp6.maxlen = ai_udp6->ai_addrlen;
 289                         if ((!rpcb_set(NFS_PROGRAM, 2, nconf_udp6, &nb_udp6)) ||
 290                             (!rpcb_set(NFS_PROGRAM, 3, nconf_udp6, &nb_udp6)))
 291                                 err(1, "rpcb_set udp6 failed");
 292                         freeaddrinfo(ai_udp6);
 293                 }
 294                 if (tcpflag) {
 295                         memset(&hints, 0, sizeof hints);
 296                         hints.ai_flags = AI_PASSIVE;
 297                         hints.ai_family = AF_INET;
 298                         hints.ai_socktype = SOCK_STREAM;
 299                         hints.ai_protocol = IPPROTO_TCP;
 300                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp);
 301                         if (ecode != 0)
 302                                 err(1, "getaddrinfo tcp: %s", gai_strerror(ecode));
 303                         nconf_tcp = getnetconfigent("tcp");
 304                         if (nconf_tcp == NULL)
 305                                 err(1, "getnetconfigent tcp failed");
 306                         nb_tcp.buf = ai_tcp->ai_addr;
 307                         nb_tcp.len = nb_tcp.maxlen = ai_tcp->ai_addrlen;
 308                         if ((!rpcb_set(NFS_PROGRAM, 2, nconf_tcp, &nb_tcp)) ||
 309                             (!rpcb_set(NFS_PROGRAM, 3, nconf_tcp, &nb_tcp)))
 310                                 err(1, "rpcb_set tcp failed");
 311                         freeaddrinfo(ai_tcp);
 312                 }
 313                 if (tcpflag && ip6flag) {
 314                         memset(&hints, 0, sizeof hints);
 315                         hints.ai_flags = AI_PASSIVE;
 316                         hints.ai_family = AF_INET6;
 317                         hints.ai_socktype = SOCK_STREAM;
 318                         hints.ai_protocol = IPPROTO_TCP;
 319                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp6);
 320                         if (ecode != 0)
 321                                 err(1, "getaddrinfo tcp6: %s", gai_strerror(ecode));
 322                         nconf_tcp6 = getnetconfigent("tcp6");
 323                         if (nconf_tcp6 == NULL)
 324                                 err(1, "getnetconfigent tcp6 failed");
 325                         nb_tcp6.buf = ai_tcp6->ai_addr;
 326                         nb_tcp6.len = nb_tcp6.maxlen = ai_tcp6->ai_addrlen;
 327                         if ((!rpcb_set(NFS_PROGRAM, 2, nconf_tcp6, &nb_tcp6)) ||
 328                             (!rpcb_set(NFS_PROGRAM, 3, nconf_tcp6, &nb_tcp6)))
 329                                 err(1, "rpcb_set tcp6 failed");
 330                         freeaddrinfo(ai_tcp6);
 331                 }
 332                 exit (0);
 333         }
 334         if (debug == 0) {
 335                 daemon(0, 0);
 336                 (void)signal(SIGHUP, SIG_IGN);
 337                 (void)signal(SIGINT, SIG_IGN);
 338                 /*
 339                  * nfsd sits in the kernel most of the time.  It needs
 340                  * to ignore SIGTERM/SIGQUIT in order to stay alive as long
 341                  * as possible during a shutdown, otherwise loopback
 342                  * mounts will not be able to unmount.
 343                  */
 344                 (void)signal(SIGTERM, SIG_IGN);
 345                 (void)signal(SIGQUIT, SIG_IGN);
 346         }
 347         (void)signal(SIGSYS, nonfs);
 348         (void)signal(SIGCHLD, reapchild);
 349
 350         openlog("nfsd", LOG_PID, LOG_DAEMON);
 351
 352         /*
 353          * For V4, we open the stablerestart file and call nfssvc()
 354          * to get it loaded. This is done before the daemons do the
 355          * regular nfssvc() call to service NFS requests.
 356          * (This way the file remains open until the last nfsd is killed
 357          *  off.)
 358          * Note that this file is not created by this daemon and can
 359          * only be relocated by recompiling the daemon, in order to
 360          * minimize accidentally starting up with the wrong file.
 361          * If should be created as an empty file Read and Write for
 362          * root before the first time you run NFS v4 and should never
 363          * be re-initialized if at all possible. It should live on a
 364          * local, non-volatile storage device that does not do hardware
 365          * level write-back caching. (See SCSI doc for more information
 366          * on how to prevent write-back caching on SCSI disks.)
 367          */
 368         if (run_v4server > 0) {
 369                 stablefd = open(NFSD_STABLERESTART, O_RDWR, 0);
 370                 if (stablefd < 0) {
 371                         syslog(LOG_ERR, "Can't open %s\n", NFSD_STABLERESTART);
 372                         exit(1);
 373                 }
 374                 if (nfssvc(NFSSVC_STABLERESTART, (caddr_t)&stablefd) < 0) {
 375                         syslog(LOG_ERR, "Can't read stable storage file\n");
 376                         exit(1);
 377                 }
 378                 nfssvc_addsock = NFSSVC_NFSDADDSOCK;
 379                 nfssvc_nfsd = NFSSVC_NFSDNFSD;
 380                 new_syscall = TRUE;
 381         } else {
 382                 nfssvc_addsock = NFSSVC_ADDSOCK;
 383                 nfssvc_nfsd = NFSSVC_NFSD;
 384                 /*
 385                  * Figure out if the kernel supports the new-style
 386                  * NFSSVC_NFSD. Old kernels will return ENXIO because they
 387                  * don't recognise the flag value, new ones will return EINVAL
 388                  * because argp is NULL.
 389                  */
 390                 new_syscall = FALSE;
 391                 if (nfssvc(NFSSVC_NFSD, NULL) < 0 && errno == EINVAL)
 392                         new_syscall = TRUE;
 393         }
 394
 395         if (!new_syscall) {
 396                 /* If we use UDP only, we start the last server below. */
 397                 srvcnt = tcpflag ? nfsdcnt : nfsdcnt - 1;
 398                 for (i = 0; i < srvcnt; i++) {
 399                         switch ((pid = fork())) {
 400                         case -1:
 401                                 syslog(LOG_ERR, "fork: %m");
 402                                 nfsd_exit(1);
 403                         case 0:
 404                                 break;
 405                         default:
 406                                 children[i] = pid;
 407                                 continue;
 408                         }
 409                         (void)signal(SIGUSR1, child_cleanup);
 410                         setproctitle("server");
 411
 412                         start_server(0);
 413                 }
 414         } else if (tcpflag) {
 415                 /*
 416                  * For TCP mode, we fork once to start the first
 417                  * kernel nfsd thread. The kernel will add more
 418                  * threads as needed.
 419                  */
 420                 pid = fork();
 421                 if (pid == -1) {
 422                         syslog(LOG_ERR, "fork: %m");
 423                         nfsd_exit(1);
 424                 }
 425                 if (pid) {
 426                         children[0] = pid;
 427                 } else {
 428                         (void)signal(SIGUSR1, child_cleanup);
 429                         setproctitle("server");
 430                         start_server(0);
 431                 }
 432         }
 433
 434         (void)signal(SIGUSR1, cleanup);
 435         FD_ZERO(&v4bits);
 436         FD_ZERO(&v6bits);
 437         FD_ZERO(&sockbits);
 438
 439         rpcbregcnt = 0;
 440         /* Set up the socket for udp and rpcb register it. */
 441         if (udpflag) {
 442                 rpcbreg = 0;
 443                 for (i = 0; i < bindhostc; i++) {
 444                         memset(&hints, 0, sizeof hints);
 445                         hints.ai_flags = AI_PASSIVE;
 446                         hints.ai_family = AF_INET;
 447                         hints.ai_socktype = SOCK_DGRAM;
 448                         hints.ai_protocol = IPPROTO_UDP;
 449                         if (setbindhost(&ai_udp, bindhost[i], hints) == 0) {
 450                                 rpcbreg = 1;
 451                                 rpcbregcnt++;
 452                                 if ((sock = socket(ai_udp->ai_family,
 453                                     ai_udp->ai_socktype,
 454                                     ai_udp->ai_protocol)) < 0) {
 455                                         syslog(LOG_ERR,
 456                                             "can't create udp socket");
 457                                         nfsd_exit(1);
 458                                 }
 459                                 if (bind(sock, ai_udp->ai_addr,
 460                                     ai_udp->ai_addrlen) < 0) {
 461                                         syslog(LOG_ERR,
 462                                             "can't bind udp addr %s: %m",
 463                                             bindhost[i]);
 464                                         nfsd_exit(1);
 465                                 }
 466                                 freeaddrinfo(ai_udp);
 467                                 addsockargs.sock = sock;
 468                                 addsockargs.name = NULL;
 469                                 addsockargs.namelen = 0;
 470                                 if (nfssvc(nfssvc_addsock, &addsockargs) < 0) {
 471                                         syslog(LOG_ERR, "can't Add UDP socket");
 472                                         nfsd_exit(1);
 473                                 }
 474                                 (void)close(sock);
 475                         }
 476                 }
 477                 if (rpcbreg == 1) {
 478                         memset(&hints, 0, sizeof hints);
 479                         hints.ai_flags = AI_PASSIVE;
 480                         hints.ai_family = AF_INET;
 481                         hints.ai_socktype = SOCK_DGRAM;
 482                         hints.ai_protocol = IPPROTO_UDP;
 483                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp);
 484                         if (ecode != 0) {
 485                                 syslog(LOG_ERR, "getaddrinfo udp: %s",
 486                                    gai_strerror(ecode));
 487                                 nfsd_exit(1);
 488                         }
 489                         nconf_udp = getnetconfigent("udp");
 490                         if (nconf_udp == NULL)
 491                                 err(1, "getnetconfigent udp failed");
 492                         nb_udp.buf = ai_udp->ai_addr;
 493                         nb_udp.len = nb_udp.maxlen = ai_udp->ai_addrlen;
 494                         if ((!rpcb_set(NFS_PROGRAM, 2, nconf_udp, &nb_udp)) ||
 495                             (!rpcb_set(NFS_PROGRAM, 3, nconf_udp, &nb_udp)))
 496                                 err(1, "rpcb_set udp failed");
 497                         freeaddrinfo(ai_udp);
 498                 }
 499         }
 500
 501         /* Set up the socket for udp6 and rpcb register it. */
 502         if (udpflag && ip6flag) {
 503                 rpcbreg = 0;
 504                 for (i = 0; i < bindhostc; i++) {
 505                         memset(&hints, 0, sizeof hints);
 506                         hints.ai_flags = AI_PASSIVE;
 507                         hints.ai_family = AF_INET6;
 508                         hints.ai_socktype = SOCK_DGRAM;
 509                         hints.ai_protocol = IPPROTO_UDP;
 510                         if (setbindhost(&ai_udp6, bindhost[i], hints) == 0) {
 511                                 rpcbreg = 1;
 512                                 rpcbregcnt++;
 513                                 if ((sock = socket(ai_udp6->ai_family,
 514                                     ai_udp6->ai_socktype,
 515                                     ai_udp6->ai_protocol)) < 0) {
 516                                         syslog(LOG_ERR,
 517                                                 "can't create udp6 socket");
 518                                         nfsd_exit(1);
 519                                 }
 520                                 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
 521                                     &on, sizeof on) < 0) {
 522                                         syslog(LOG_ERR,
 523                                             "can't set v6-only binding for "
 524                                             "udp6 socket: %m");
 525                                         nfsd_exit(1);
 526                                 }
 527                                 if (bind(sock, ai_udp6->ai_addr,
 528                                     ai_udp6->ai_addrlen) < 0) {
 529                                         syslog(LOG_ERR,
 530                                             "can't bind udp6 addr %s: %m",
 531                                             bindhost[i]);
 532                                         nfsd_exit(1);
 533                                 }
 534                                 freeaddrinfo(ai_udp6);
 535                                 addsockargs.sock = sock;
 536                                 addsockargs.name = NULL;
 537                                 addsockargs.namelen = 0;
 538                                 if (nfssvc(nfssvc_addsock, &addsockargs) < 0) {
 539                                         syslog(LOG_ERR,
 540                                             "can't add UDP6 socket");
 541                                         nfsd_exit(1);
 542                                 }
 543                                 (void)close(sock);
 544                         }
 545                 }
 546                 if (rpcbreg == 1) {
 547                         memset(&hints, 0, sizeof hints);
 548                         hints.ai_flags = AI_PASSIVE;
 549                         hints.ai_family = AF_INET6;
 550                         hints.ai_socktype = SOCK_DGRAM;
 551                         hints.ai_protocol = IPPROTO_UDP;
 552                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_udp6);
 553                         if (ecode != 0) {
 554                                 syslog(LOG_ERR, "getaddrinfo udp6: %s",
 555                                    gai_strerror(ecode));
 556                                 nfsd_exit(1);
 557                         }
 558                         nconf_udp6 = getnetconfigent("udp6");
 559                         if (nconf_udp6 == NULL)
 560                                 err(1, "getnetconfigent udp6 failed");
 561                         nb_udp6.buf = ai_udp6->ai_addr;
 562                         nb_udp6.len = nb_udp6.maxlen = ai_udp6->ai_addrlen;
 563                         if ((!rpcb_set(NFS_PROGRAM, 2, nconf_udp6, &nb_udp6)) ||
 564                             (!rpcb_set(NFS_PROGRAM, 3, nconf_udp6, &nb_udp6)))
 565                                 err(1, "rpcb_set udp6 failed");
 566                         freeaddrinfo(ai_udp6);
 567                 }
 568         }
 569
 570         /* Set up the socket for tcp and rpcb register it. */
 571         if (tcpflag) {
 572                 rpcbreg = 0;
 573                 for (i = 0; i < bindhostc; i++) {
 574                         memset(&hints, 0, sizeof hints);
 575                         hints.ai_flags = AI_PASSIVE;
 576                         hints.ai_family = AF_INET;
 577                         hints.ai_socktype = SOCK_STREAM;
 578                         hints.ai_protocol = IPPROTO_TCP;
 579                         if (setbindhost(&ai_tcp, bindhost[i], hints) == 0) {
 580                                 rpcbreg = 1;
 581                                 rpcbregcnt++;
 582                                 if ((tcpsock = socket(AF_INET, SOCK_STREAM,
 583                                     0)) < 0) {
 584                                         syslog(LOG_ERR,
 585                                             "can't create tpc socket");
 586                                         nfsd_exit(1);
 587                                 }
 588                                 if (setsockopt(tcpsock, SOL_SOCKET,
 589                                     SO_REUSEADDR,
 590                                     (char *)&on, sizeof(on)) < 0)
 591                                         syslog(LOG_ERR,
 592                                              "setsockopt SO_REUSEADDR: %m");
 593                                 if (bind(tcpsock, ai_tcp->ai_addr,
 594                                     ai_tcp->ai_addrlen) < 0) {
 595                                         syslog(LOG_ERR,
 596                                             "can't bind tcp addr %s: %m",
 597                                             bindhost[i]);
 598                                         nfsd_exit(1);
 599                                 }
 600                                 if (listen(tcpsock, 5) < 0) {
 601                                         syslog(LOG_ERR, "listen failed");
 602                                         nfsd_exit(1);
 603                                 }
 604                                 freeaddrinfo(ai_tcp);
 605                                 FD_SET(tcpsock, &sockbits);
 606                                 FD_SET(tcpsock, &v4bits);
 607                                 maxsock = tcpsock;
 608                                 connect_type_cnt++;
 609                         }
 610                 }
 611                 if (rpcbreg == 1) {
 612                         memset(&hints, 0, sizeof hints);
 613                         hints.ai_flags = AI_PASSIVE;
 614                         hints.ai_family = AF_INET;
 615                         hints.ai_socktype = SOCK_STREAM;
 616                         hints.ai_protocol = IPPROTO_TCP;
 617                         ecode = getaddrinfo(NULL, "nfs", &hints,
 618                              &ai_tcp);
 619                         if (ecode != 0) {
 620                                 syslog(LOG_ERR, "getaddrinfo tcp: %s",
 621                                    gai_strerror(ecode));
 622                                 nfsd_exit(1);
 623                         }
 624                         nconf_tcp = getnetconfigent("tcp");
 625                         if (nconf_tcp == NULL)
 626                                 err(1, "getnetconfigent tcp failed");
 627                         nb_tcp.buf = ai_tcp->ai_addr;
 628                         nb_tcp.len = nb_tcp.maxlen = ai_tcp->ai_addrlen;
 629                         if ((!rpcb_set(NFS_PROGRAM, 2, nconf_tcp,
 630                             &nb_tcp)) || (!rpcb_set(NFS_PROGRAM, 3,
 631                             nconf_tcp, &nb_tcp)))
 632                                 err(1, "rpcb_set tcp failed");
 633                         freeaddrinfo(ai_tcp);
 634                 }
 635         }
 636
 637         /* Set up the socket for tcp6 and rpcb register it. */
 638         if (tcpflag && ip6flag) {
 639                 rpcbreg = 0;
 640                 for (i = 0; i < bindhostc; i++) {
 641                         memset(&hints, 0, sizeof hints);
 642                         hints.ai_flags = AI_PASSIVE;
 643                         hints.ai_family = AF_INET6;
 644                         hints.ai_socktype = SOCK_STREAM;
 645                         hints.ai_protocol = IPPROTO_TCP;
 646                         if (setbindhost(&ai_tcp6, bindhost[i], hints) == 0) {
 647                                 rpcbreg = 1;
 648                                 rpcbregcnt++;
 649                                 if ((tcp6sock = socket(ai_tcp6->ai_family,
 650                                     ai_tcp6->ai_socktype,
 651                                     ai_tcp6->ai_protocol)) < 0) {
 652                                         syslog(LOG_ERR,
 653                                             "can't create tcp6 socket");
 654                                         nfsd_exit(1);
 655                                 }
 656                                 if (setsockopt(tcp6sock, SOL_SOCKET,
 657                                     SO_REUSEADDR,
 658                                     (char *)&on, sizeof(on)) < 0)
 659                                         syslog(LOG_ERR,
 660                                             "setsockopt SO_REUSEADDR: %m");
 661                                 if (setsockopt(tcp6sock, IPPROTO_IPV6,
 662                                     IPV6_V6ONLY, &on, sizeof on) < 0) {
 663                                         syslog(LOG_ERR,
 664                                         "can't set v6-only binding for tcp6 "
 665                                             "socket: %m");
 666                                         nfsd_exit(1);
 667                                 }
 668                                 if (bind(tcp6sock, ai_tcp6->ai_addr,
 669                                     ai_tcp6->ai_addrlen) < 0) {
 670                                         syslog(LOG_ERR,
 671                                             "can't bind tcp6 addr %s: %m",
 672                                             bindhost[i]);
 673                                         nfsd_exit(1);
 674                                 }
 675                                 if (listen(tcp6sock, 5) < 0) {
 676                                         syslog(LOG_ERR, "listen failed");
 677                                         nfsd_exit(1);
 678                                 }
 679                                 freeaddrinfo(ai_tcp6);
 680                                 FD_SET(tcp6sock, &sockbits);
 681                                 FD_SET(tcp6sock, &v6bits);
 682                                 if (maxsock < tcp6sock)
 683                                         maxsock = tcp6sock;
 684                                 connect_type_cnt++;
 685                         }
 686                 }
 687                 if (rpcbreg == 1) {
 688                         memset(&hints, 0, sizeof hints);
 689                         hints.ai_flags = AI_PASSIVE;
 690                         hints.ai_family = AF_INET6;
 691                         hints.ai_socktype = SOCK_STREAM;
 692                         hints.ai_protocol = IPPROTO_TCP;
 693                         ecode = getaddrinfo(NULL, "nfs", &hints, &ai_tcp6);
 694                         if (ecode != 0) {
 695                                 syslog(LOG_ERR, "getaddrinfo tcp6: %s",
 696                                    gai_strerror(ecode));
 697                                 nfsd_exit(1);
 698                         }
 699                         nconf_tcp6 = getnetconfigent("tcp6");
 700                         if (nconf_tcp6 == NULL)
 701                                 err(1, "getnetconfigent tcp6 failed");
 702                         nb_tcp6.buf = ai_tcp6->ai_addr;
 703                         nb_tcp6.len = nb_tcp6.maxlen = ai_tcp6->ai_addrlen;
 704                         if ((!rpcb_set(NFS_PROGRAM, 2, nconf_tcp6, &nb_tcp6)) ||
 705                             (!rpcb_set(NFS_PROGRAM, 3, nconf_tcp6, &nb_tcp6)))
 706                                 err(1, "rpcb_set tcp6 failed");
 707                         freeaddrinfo(ai_tcp6);
 708                 }
 709         }
 710
 711         if (rpcbregcnt == 0) {
 712                 syslog(LOG_ERR, "rpcb_set() failed, nothing to do: %m");
 713                 nfsd_exit(1);
 714         }
 715
 716         if (tcpflag && connect_type_cnt == 0) {
 717                 syslog(LOG_ERR, "tcp connects == 0, nothing to do: %m");
 718                 nfsd_exit(1);
 719         }
 720
 721         setproctitle("master");
 722         /*
 723          * We always want a master to have a clean way to to shut nfsd down
 724          * (with unregistration): if the master is killed, it unregisters and
 725          * kills all children. If we run for UDP only (and so do not have to
 726          * loop waiting waiting for accept), we instead make the parent
 727          * a "server" too. start_server will not return.
 728          */
 729         if (!tcpflag)
 730                 start_server(1);
 731
 732         /*
 733          * Loop forever accepting connections and passing the sockets
 734          * into the kernel for the mounts.
 735          */
 736         for (;;) {
 737                 ready = sockbits;
 738                 if (connect_type_cnt > 1) {
 739                         if (select(maxsock + 1,
 740                             &ready, NULL, NULL, NULL) < 1) {
 741                                 error = errno;
 742                                 syslog(LOG_ERR, "select failed: %m");
 743                                 if (error == EINTR)
 744                                         continue;
 745                                 nfsd_exit(1);
 746                         }
 747                 }
 748                 for (tcpsock = 0; tcpsock <= maxsock; tcpsock++) {
 749                         if (FD_ISSET(tcpsock, &ready)) {
 750                                 if (FD_ISSET(tcpsock, &v4bits)) {
 751                                         len = sizeof(inetpeer);
 752                                         if ((msgsock = accept(tcpsock,
 753                                             (struct sockaddr *)&inetpeer, &len)) < 0) {
 754                                                 error = errno;
 755                                                 syslog(LOG_ERR, "accept failed: %m");
 756                                                 if (error == ECONNABORTED ||
 757                                                     error == EINTR)
 758                                                         continue;
 759                                                 nfsd_exit(1);
 760                                         }
 761                                         memset(inetpeer.sin_zero, 0,
 762                                                 sizeof(inetpeer.sin_zero));
 763                                         if (setsockopt(msgsock, SOL_SOCKET,
 764                                             SO_KEEPALIVE, (char *)&on, sizeof(on)) < 0)
 765                                                 syslog(LOG_ERR,
 766                                                     "setsockopt SO_KEEPALIVE: %m");
 767                                         addsockargs.sock = msgsock;
 768                                         addsockargs.name = (caddr_t)&inetpeer;
 769                                         addsockargs.namelen = len;
 770                                         nfssvc(nfssvc_addsock, &addsockargs);
 771                                         (void)close(msgsock);
 772                                 } else if (FD_ISSET(tcpsock, &v6bits)) {
 773                                         len = sizeof(inet6peer);
 774                                         if ((msgsock = accept(tcpsock,
 775                                             (struct sockaddr *)&inet6peer,
 776                                             &len)) < 0) {
 777                                                 error = errno;
 778                                                 syslog(LOG_ERR,
 779                                                      "accept failed: %m");
 780                                                 if (error == ECONNABORTED ||
 781                                                     error == EINTR)
 782                                                         continue;
 783                                                 nfsd_exit(1);
 784                                         }
 785                                         if (setsockopt(msgsock, SOL_SOCKET,
 786                                             SO_KEEPALIVE, (char *)&on,
 787                                             sizeof(on)) < 0)
 788                                                 syslog(LOG_ERR, "setsockopt "
 789                                                     "SO_KEEPALIVE: %m");
 790                                         addsockargs.sock = msgsock;
 791                                         addsockargs.name = (caddr_t)&inet6peer;
 792                                         addsockargs.namelen = len;
 793                                         nfssvc(nfssvc_addsock, &addsockargs);
 794                                         (void)close(msgsock);
 795                                 }
 796                         }
 797                 }
 798         }
 799 }
 800
 801 int
 802 setbindhost(struct addrinfo **ai, const char *bindhost, struct addrinfo hints)
 803 {
 804         int ecode;
 805         u_int32_t host_addr[4];  /* IPv4 or IPv6 */
 806         const char *hostptr;
 807
 808         if (bindhost == NULL || strcmp("*", bindhost) == 0)
 809                 hostptr = NULL;
 810         else
 811                 hostptr = bindhost;
 812
 813         if (hostptr != NULL) {
 814                 switch (hints.ai_family) {
 815                 case AF_INET:
 816                         if (inet_pton(AF_INET, hostptr, host_addr) == 1) {
 817                                 hints.ai_flags = AI_NUMERICHOST;
 818                         } else {
 819                                 if (inet_pton(AF_INET6, hostptr,
 820                                     host_addr) == 1)
 821                                         return (1);
 822                         }
 823                         break;
 824                 case AF_INET6:
 825                         if (inet_pton(AF_INET6, hostptr, host_addr) == 1) {
 826                                 hints.ai_flags = AI_NUMERICHOST;
 827                         } else {
 828                                 if (inet_pton(AF_INET, hostptr,
 829                                     host_addr) == 1)
 830                                         return (1);
 831                         }
 832                         break;
 833                 default:
 834                         break;
 835                 }
 836         }
 837
 838         ecode = getaddrinfo(hostptr, "nfs", &hints, ai);
 839         if (ecode != 0) {
 840                 syslog(LOG_ERR, "getaddrinfo %s: %s", bindhost,
 841                     gai_strerror(ecode));
 842                 return (1);
 843         }
 844         return (0);
 845 }
 846
 847 void
 848 usage(void)
 849 {
 850         (void)fprintf(stderr, "usage: nfsd %s\n", USAGE);
 851         exit(1);
 852 }
 853
 854 void
 855 nonfs(__unused int signo)
 856 {
 857         syslog(LOG_ERR, "missing system call: NFS not available");
 858 }
 859
 860 void
 861 reapchild(__unused int signo)
 862 {
 863         pid_t pid;
 864         int i;
 865
 866         while ((pid = wait3(NULL, WNOHANG, NULL)) > 0) {
 867                 for (i = 0; i < nfsdcnt; i++)
 868                         if (pid == children[i])
 869                                 children[i] = -1;
 870         }
 871 }
 872
 873 void
 874 unregistration(void)
 875 {
 876         if ((!rpcb_unset(NFS_PROGRAM, 2, NULL)) ||
 877             (!rpcb_unset(NFS_PROGRAM, 3, NULL)))
 878                 syslog(LOG_ERR, "rpcb_unset failed");
 879 }
 880
 881 void
 882 killchildren(void)
 883 {
 884         int i;
 885
 886         for (i = 0; i < nfsdcnt; i++) {
 887                 if (children[i] > 0)
 888                         kill(children[i], SIGKILL);
 889         }
 890 }
 891
 892 /*
 893  * Cleanup master after SIGUSR1.
 894  */
 895 void
 896 cleanup(__unused int signo)
 897 {
 898         nfsd_exit(0);
 899 }
 900
 901 /*
 902  * Cleanup child after SIGUSR1.
 903  */
 904 void
 905 child_cleanup(__unused int signo)
 906 {
 907         exit(0);
 908 }
 909
 910 void
 911 nfsd_exit(int status)
 912 {
 913         killchildren();
 914         unregistration();
 915         exit(status);
 916 }
 917
 918 void
 919 start_server(int master)
 920 {
 921         char principal[MAXHOSTNAMELEN + 5];
 922         struct nfsd_nfsd_args nfsdargs;
 923         int status, error;
 924         char hostname[MAXHOSTNAMELEN + 1], *cp;
 925         struct addrinfo *aip, hints;
 926
 927         status = 0;
 928         if (new_syscall) {
 929                 gethostname(hostname, sizeof (hostname));
 930                 snprintf(principal, sizeof (principal), "nfs@%s", hostname);
 931                 if ((cp = strchr(hostname, '.')) == NULL ||
 932                     *(cp + 1) == '\0') {
 933                         /* If not fully qualified, try getaddrinfo() */
 934                         memset((void *)&hints, 0, sizeof (hints));
 935                         hints.ai_flags = AI_CANONNAME;
 936                         error = getaddrinfo(hostname, NULL, &hints, &aip);
 937                         if (error == 0) {
 938                                 if (aip->ai_canonname != NULL &&
 939                                     (cp = strchr(aip->ai_canonname, '.')) !=
 940                                     NULL && *(cp + 1) != '\0')
 941                                         snprintf(principal, sizeof (principal),
 942                                             "nfs@%s", aip->ai_canonname);
 943                                 freeaddrinfo(aip);
 944                         }
 945                 }
 946                 nfsdargs.principal = principal;
 947                 nfsdargs.minthreads = nfsdcnt;
 948                 nfsdargs.maxthreads = nfsdcnt;
 949                 error = nfssvc(nfssvc_nfsd, &nfsdargs);
 950                 if (error < 0 && errno == EAUTH) {
 951                         /*
 952                          * This indicates that it could not register the
 953                          * rpcsec_gss credentials, usually because the
 954                          * gssd daemon isn't running.
 955                          * (only the experimental server with nfsv4)
 956                          */
 957                         syslog(LOG_ERR, "No gssd, using AUTH_SYS only");
 958                         principal[0] = '\0';
 959                         error = nfssvc(nfssvc_nfsd, &nfsdargs);
 960                 }
 961                 if (error < 0) {
 962                         syslog(LOG_ERR, "nfssvc: %m");
 963                         status = 1;
 964                 }
 965         } else {
 966                 if (nfssvc(NFSSVC_OLDNFSD, NULL) < 0) {
 967                         syslog(LOG_ERR, "nfssvc: %m");
 968                         status = 1;
 969                 }
 970         }
 971         if (master)
 972                 nfsd_exit(status);
 973         else
 974                 exit(status);
 975 }