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Sourcecode: freebsd-utils version File versions

mount_nfs.c

/*
 * copyright (c) 2003
 * the regents of the university of michigan
 * all rights reserved
 * 
 * permission is granted to use, copy, create derivative works and redistribute
 * this software and such derivative works for any purpose, so long as the name
 * of the university of michigan is not used in any advertising or publicity
 * pertaining to the use or distribution of this software without specific,
 * written prior authorization.  if the above copyright notice or any other
 * identification of the university of michigan is included in any copy of any
 * portion of this software, then the disclaimer below must also be included.
 * 
 * this software is provided as is, without representation from the university
 * of michigan as to its fitness for any purpose, and without warranty by the
 * university of michigan of any kind, either express or implied, including
 * without limitation the implied warranties of merchantability and fitness for
 * a particular purpose. the regents of the university of michigan shall not be
 * liable for any damages, including special, indirect, incidental, or
 * consequential damages, with respect to any claim arising out of or in
 * connection with the use of the software, even if it has been or is hereafter
 * advised of the possibility of such damages.
 */

/*
 * Copyright (c) 1992, 1993, 1994
 *    The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if 0
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1992, 1993, 1994\n\
      The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)mount_nfs.c   8.11 (Berkeley) 5/4/95";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sbin/mount_nfs/mount_nfs.c,v 1.72.6.1 2008/11/25 02:59:29 kensmith Exp $");

#include <sys/param.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syslog.h>
#include <sys/uio.h>

#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>

#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfsclient/nfs.h>
#include <nfsclient/nfsargs.h>

#include <arpa/inet.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sysexits.h>
#include <unistd.h>

#include "mntopts.h"
#include "mounttab.h"

#define     ALTF_BG           0x1
#define ALTF_NOCONN     0x2
#define ALTF_DUMBTIMR   0x4
#define ALTF_INTR 0x8
#define ALTF_NFSV3      0x20
#define ALTF_RDIRPLUS   0x40
#define ALTF_MNTUDP     0x80
#define ALTF_RESVPORT   0x100
#define ALTF_SEQPACKET  0x200
#define ALTF_SOFT 0x800
#define ALTF_TCP  0x1000
#define ALTF_PORT 0x2000
#define ALTF_NFSV2      0x4000
#define ALTF_ACREGMIN   0x8000
#define ALTF_ACREGMAX   0x10000
#define ALTF_ACDIRMIN   0x20000
#define ALTF_ACDIRMAX   0x40000
#define ALTF_NOLOCKD    0x80000
#define ALTF_NOINET4    0x100000
#define ALTF_NOINET6    0x200000

struct mntopt mopts[] = {
      MOPT_STDOPTS,
      MOPT_FORCE,
      MOPT_UPDATE,
      MOPT_ASYNC,
      { "bg", 0, ALTF_BG, 1 },
      { "fg", 1, ALTF_BG, 1 },
      { "conn", 1, ALTF_NOCONN, 1 },
      { "dumbtimer", 0, ALTF_DUMBTIMR, 1 },
      { "intr", 0, ALTF_INTR, 1 },
      { "nfsv3", 0, ALTF_NFSV3, 1 },
      { "rdirplus", 0, ALTF_RDIRPLUS, 1 },
      { "mntudp", 0, ALTF_MNTUDP, 1 },
      { "resvport", 0, ALTF_RESVPORT, 1 },
      { "soft", 0, ALTF_SOFT, 1 },
      { "hard", 1, ALTF_SOFT, 1 },
      { "tcp", 0, ALTF_TCP, 1 },
      { "port=", 0, ALTF_PORT, 1 },
      { "nfsv2", 0, ALTF_NFSV2, 1 },
      { "acregmin=", 0, ALTF_ACREGMIN, 1 },
      { "acregmax=", 0, ALTF_ACREGMAX, 1 },
      { "acdirmin=", 0, ALTF_ACDIRMIN, 1 },
      { "acdirmax=", 0, ALTF_ACDIRMAX, 1 },
      { "lockd", 1, ALTF_NOLOCKD, 1 },
      { "inet4", 1, ALTF_NOINET4, 1 },
      { "inet6", 1, ALTF_NOINET6, 1 },
      MOPT_END
};

struct nfs_args nfsdefargs = {
      NFS_ARGSVERSION,
      NULL,
      sizeof (struct sockaddr_in),
      SOCK_DGRAM,
      0,
      NULL,
      0,
      NFSMNT_RESVPORT,
      NFS_WSIZE,
      NFS_RSIZE,
      NFS_READDIRSIZE,
      10,
      NFS_RETRANS,
      NFS_MAXGRPS,
      NFS_DEFRAHEAD,
      0,                /* was: NQ_DEFLEASE */
      NFS_MAXDEADTHRESH,      /* was: NQ_DEADTHRESH */
      NULL,
      /* args version 4 */
      NFS_MINATTRTIMO,
      NFS_MAXATTRTIMO,
      NFS_MINDIRATTRTIMO,
      NFS_MAXDIRATTRTIMO,
};

/* Table for af,sotype -> netid conversions. */
struct nc_protos {
      char *netid;
      int af;
      int sotype;
} nc_protos[] = {
      {"udp",           AF_INET,    SOCK_DGRAM},
      {"tcp",           AF_INET,    SOCK_STREAM},
      {"udp6",    AF_INET6,   SOCK_DGRAM},
      {"tcp6",    AF_INET6,   SOCK_STREAM},
      {NULL,            0,          0}
};

struct nfhret {
      u_long            stat;
      long        vers;
      long        auth;
      long        fhsize;
      u_char            nfh[NFSX_V3FHMAX];
};
#define     BGRND 1
#define     ISBGRND     2
#define     OF_NOINET4  4
#define     OF_NOINET6  8
int retrycnt = -1;
int opflags = 0;
int nfsproto = IPPROTO_UDP;
int mnttcp_ok = 1;
char *portspec = NULL;  /* Server nfs port; NULL means look up via rpcbind. */
enum mountmode {
      ANY,
      V2,
      V3,
      V4
} mountmode = ANY;

/* Return codes for nfs_tryproto. */
enum tryret {
      TRYRET_SUCCESS,
      TRYRET_TIMEOUT,         /* No response received. */
      TRYRET_REMOTEERR, /* Error received from remote server. */
      TRYRET_LOCALERR         /* Local failure. */
};

int   getnfsargs(char *, struct nfs_args *);
int   getnfs4args(char *, struct nfs_args *);
/* void     set_rpc_maxgrouplist(int); */
struct netconfig *getnetconf_cached(const char *netid);
char  *netidbytype(int af, int sotype);
void  usage(void) __dead2;
int   xdr_dir(XDR *, char *);
int   xdr_fh(XDR *, struct nfhret *);
enum tryret nfs_tryproto(struct nfs_args *nfsargsp, struct addrinfo *ai,
    char *hostp, char *spec, char **errstr);
enum tryret nfs4_tryproto(struct nfs_args *nfsargsp, struct addrinfo *ai,
    char *hostp, char *spec, char **errstr);
enum tryret returncode(enum clnt_stat stat, struct rpc_err *rpcerr);

/*
 * Used to set mount flags with getmntopts.  Call with dir=TRUE to
 * initialize altflags from the current mount flags.  Call with
 * dir=FALSE to update mount flags with the new value of altflags after
 * the call to getmntopts.
 */
static void
set_flags(int* altflags, int* nfsflags, int dir)
{
#define F2(af, nf)                              \
      if (dir) {                          \
            if (*nfsflags & NFSMNT_##nf)        \
                  *altflags |= ALTF_##af;       \
            else                          \
                  *altflags &= ~ALTF_##af;      \
      } else {                            \
            if (*altflags & ALTF_##af)          \
                  *nfsflags |= NFSMNT_##nf;     \
            else                          \
                  *nfsflags &= ~NFSMNT_##nf;    \
      }
#define F(f)      F2(f,f)

      F(NOCONN);
      F(DUMBTIMR);
      F2(INTR, INT);
      F(RDIRPLUS);
      F(RESVPORT);
      F(SOFT);
      F(ACREGMIN);
      F(ACREGMAX);
      F(ACDIRMIN);
      F(ACDIRMAX);
      F(NOLOCKD);

#undef F
#undef F2
}

int
main(int argc, char *argv[])
{
      int c;
      struct nfs_args *nfsargsp;
      struct nfs_args nfsargs;
      struct iovec *iov;
      int mntflags, altflags, num;
      int iovlen;
      char *name, *p, *spec, *fstype;
      char mntpath[MAXPATHLEN], errmsg[255];

      mntflags = 0;
      altflags = 0;
      nfsargs = nfsdefargs;
      nfsargsp = &nfsargs;
      iov = NULL;
      iovlen = 0;
      memset(errmsg, 0, sizeof(errmsg));

      fstype = strrchr(argv[0], '_');
      if (fstype == NULL)
            errx(EX_USAGE, "argv[0] must end in _fstype");

      ++fstype;

      if (strcmp(fstype, "nfs4") == 0) {
            nfsproto = IPPROTO_TCP;
            portspec = "2049";
            nfsdefargs.sotype = SOCK_STREAM;
            mountmode = V4;
      }

      while ((c = getopt(argc, argv,
          "234a:bcdD:g:I:iLlNo:PR:r:sTt:w:x:U")) != -1)
            switch (c) {
            case '2':
                  mountmode = V2;
                  break;
            case '3':
                  mountmode = V3;
                  break;
            case '4':
                  mountmode = V4;
                  fstype = "nfs4";
                  break;
            case 'a':
                  num = strtol(optarg, &p, 10);
                  if (*p || num < 0)
                        errx(1, "illegal -a value -- %s", optarg);
                  nfsargsp->readahead = num;
                  nfsargsp->flags |= NFSMNT_READAHEAD;
                  break;
            case 'b':
                  opflags |= BGRND;
                  break;
            case 'c':
                  nfsargsp->flags |= NFSMNT_NOCONN;
                  break;
            case 'D':
                  num = strtol(optarg, &p, 10);
                  if (*p || num <= 0)
                        errx(1, "illegal -D value -- %s", optarg);
                  nfsargsp->deadthresh = num;
                  nfsargsp->flags |= NFSMNT_DEADTHRESH;
                  break;
            case 'd':
                  nfsargsp->flags |= NFSMNT_DUMBTIMR;
                  break;
#if 0 /* XXXX */
            case 'g':
                  num = strtol(optarg, &p, 10);
                  if (*p || num <= 0)
                        errx(1, "illegal -g value -- %s", optarg);
                  set_rpc_maxgrouplist(num);
                  nfsargsp->maxgrouplist = num;
                  nfsargsp->flags |= NFSMNT_MAXGRPS;
                  break;
#endif
            case 'I':
                  num = strtol(optarg, &p, 10);
                  if (*p || num <= 0)
                        errx(1, "illegal -I value -- %s", optarg);
                  nfsargsp->readdirsize = num;
                  nfsargsp->flags |= NFSMNT_READDIRSIZE;
                  break;
            case 'i':
                  nfsargsp->flags |= NFSMNT_INT;
                  break;
            case 'L':
                  nfsargsp->flags |= NFSMNT_NOLOCKD;
                  break;
            case 'l':
                  nfsargsp->flags |= NFSMNT_RDIRPLUS;
                  break;
            case 'N':
                  nfsargsp->flags &= ~NFSMNT_RESVPORT;
                  break;
            case 'o':
                  altflags = 0;
                  set_flags(&altflags, &nfsargsp->flags, TRUE);
                  if (mountmode == V2)
                        altflags |= ALTF_NFSV2;
                  else if (mountmode == V3)
                        altflags |= ALTF_NFSV3;
                  getmntopts(optarg, mopts, &mntflags, &altflags);
                  set_flags(&altflags, &nfsargsp->flags, FALSE);
                  /*
                   * Handle altflags which don't map directly to
                   * mount flags.
                   */
                  if (altflags & ALTF_BG)
                        opflags |= BGRND;
                  if (altflags & ALTF_NOINET4)
                        opflags |= OF_NOINET4;
                  if (altflags & ALTF_NOINET6)
                        opflags |= OF_NOINET6;
                  if (altflags & ALTF_MNTUDP)
                        mnttcp_ok = 0;
                  if (altflags & ALTF_TCP) {
                        nfsargsp->sotype = SOCK_STREAM;
                        nfsproto = IPPROTO_TCP;
                  }
                  if (altflags & ALTF_PORT) {
                        /*
                         * XXX Converting from a string to an int
                         * and back again is silly, and we should
                         * allow /etc/services names.
                         */
                        p = strstr(optarg, "port=");
                        if (p) {
                              asprintf(&portspec, "%d",
                                  atoi(p + 5));
                              if (portspec == NULL)
                                    err(1, "asprintf");
                        }
                  }
                  mountmode = ANY;
                  if (altflags & ALTF_NFSV2)
                        mountmode = V2;
                  if (altflags & ALTF_NFSV3)
                        mountmode = V3;
                  if (altflags & ALTF_ACREGMIN) {
                        p = strstr(optarg, "acregmin=");
                        if (p)
                              nfsargsp->acregmin = atoi(p + 9);
                  }
                  if (altflags & ALTF_ACREGMAX) {
                        p = strstr(optarg, "acregmax=");
                        if (p)
                              nfsargsp->acregmax = atoi(p + 9);
                  }
                  if (altflags & ALTF_ACDIRMIN) {
                        p = strstr(optarg, "acdirmin=");
                        if (p)
                              nfsargsp->acdirmin = atoi(p + 9);
                  }
                  if (altflags & ALTF_ACDIRMAX) {
                        p = strstr(optarg, "acdirmax=");
                        if (p)
                              nfsargsp->acdirmax = atoi(p + 9);
                  }
                  break;
            case 'P':
                  /* obsolete for NFSMNT_RESVPORT, now default */
                  break;
            case 'R':
                  num = strtol(optarg, &p, 10);
                  if (*p || num < 0)
                        errx(1, "illegal -R value -- %s", optarg);
                  retrycnt = num;
                  break;
            case 'r':
                  num = strtol(optarg, &p, 10);
                  if (*p || num <= 0)
                        errx(1, "illegal -r value -- %s", optarg);
                  nfsargsp->rsize = num;
                  nfsargsp->flags |= NFSMNT_RSIZE;
                  break;
            case 's':
                  nfsargsp->flags |= NFSMNT_SOFT;
                  break;
            case 'T':
                  nfsargsp->sotype = SOCK_STREAM;
                  nfsproto = IPPROTO_TCP;
                  break;
            case 't':
                  num = strtol(optarg, &p, 10);
                  if (*p || num <= 0)
                        errx(1, "illegal -t value -- %s", optarg);
                  nfsargsp->timeo = num;
                  nfsargsp->flags |= NFSMNT_TIMEO;
                  break;
            case 'w':
                  num = strtol(optarg, &p, 10);
                  if (*p || num <= 0)
                        errx(1, "illegal -w value -- %s", optarg);
                  nfsargsp->wsize = num;
                  nfsargsp->flags |= NFSMNT_WSIZE;
                  break;
            case 'x':
                  num = strtol(optarg, &p, 10);
                  if (*p || num <= 0)
                        errx(1, "illegal -x value -- %s", optarg);
                  nfsargsp->retrans = num;
                  nfsargsp->flags |= NFSMNT_RETRANS;
                  break;
            case 'U':
                  mnttcp_ok = 0;
                  nfsargsp->sotype = SOCK_DGRAM;
                  nfsproto = IPPROTO_UDP;
                  break;
            default:
                  usage();
                  break;
            }
      argc -= optind;
      argv += optind;

      if (argc != 2) {
            usage();
            /* NOTREACHED */
      }

      spec = *argv++;
      name = *argv;

      if (retrycnt == -1)
            /* The default is to keep retrying forever. */
            retrycnt = 0;

      if (mountmode == V4) {
            if (!getnfs4args(spec, nfsargsp))
                  exit(1);
      } else { 
            if (!getnfsargs(spec, nfsargsp))
                  exit(1);
      }

      /* resolve the mountpoint with realpath(3) */
      (void)checkpath(name, mntpath);

      build_iovec(&iov, &iovlen, "nfs_args", nfsargsp, sizeof(*nfsargsp));
      build_iovec(&iov, &iovlen, "fstype", fstype, (size_t)-1);
      build_iovec(&iov, &iovlen, "fspath", mntpath, (size_t)-1);
      build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));

      if (nmount(iov, iovlen, mntflags))
            err(1, "%s, %s", mntpath, errmsg);

      exit(0);
}

int
getnfsargs(char *spec, struct nfs_args *nfsargsp)
{
      struct addrinfo hints, *ai_nfs, *ai;
      enum tryret ret;
      int ecode, speclen, remoteerr;
      char *hostp, *delimp, *errstr;
      size_t len;
      static char nam[MNAMELEN + 1];

      if ((delimp = strrchr(spec, ':')) != NULL) {
            hostp = spec;
            spec = delimp + 1;
      } else if ((delimp = strrchr(spec, '@')) != NULL) {
            warnx("path@server syntax is deprecated, use server:path");
            hostp = delimp + 1;
      } else {
            warnx("no <host>:<dirpath> nfs-name");
            return (0);
      }
      *delimp = '\0';

      /*
       * If there has been a trailing slash at mounttime it seems
       * that some mountd implementations fail to remove the mount
       * entries from their mountlist while unmounting.
       */
      for (speclen = strlen(spec); 
            speclen > 1 && spec[speclen - 1] == '/';
            speclen--)
            spec[speclen - 1] = '\0';
      if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
            warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
            return (0);
      }
      /* Make both '@' and ':' notations equal */
      if (*hostp != '\0') {
            len = strlen(hostp);
            memmove(nam, hostp, len);
            nam[len] = ':';
            memmove(nam + len + 1, spec, speclen);
            nam[len + speclen + 1] = '\0';
      }

      /*
       * Handle an internet host address.
       */
      memset(&hints, 0, sizeof hints);
      hints.ai_flags = AI_NUMERICHOST;
      hints.ai_socktype = nfsargsp->sotype;
      if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) != 0) {
            hints.ai_flags = 0;
            if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
                != 0) {
                  if (portspec == NULL)
                        errx(1, "%s: %s", hostp, gai_strerror(ecode));
                  else
                        errx(1, "%s:%s: %s", hostp, portspec,
                            gai_strerror(ecode));
                  return (0);
            }
      }

      ret = TRYRET_LOCALERR;
      for (;;) {
            /*
             * Try each entry returned by getaddrinfo(). Note the
             * occurence of remote errors by setting `remoteerr'.
             */
            remoteerr = 0;
            for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
                  if ((ai->ai_family == AF_INET6) &&
                      (opflags & OF_NOINET6))
                        continue;
                  if ((ai->ai_family == AF_INET) && 
                      (opflags & OF_NOINET4))
                        continue;
                  ret = nfs_tryproto(nfsargsp, ai, hostp, spec, &errstr);
                  if (ret == TRYRET_SUCCESS)
                        break;
                  if (ret != TRYRET_LOCALERR)
                        remoteerr = 1;
                  if ((opflags & ISBGRND) == 0)
                        fprintf(stderr, "%s\n", errstr);
            }
            if (ret == TRYRET_SUCCESS)
                  break;

            /* Exit if all errors were local. */
            if (!remoteerr)
                  exit(1);

            /*
             * If retrycnt == 0, we are to keep retrying forever.
             * Otherwise decrement it, and exit if it hits zero.
             */
            if (retrycnt != 0 && --retrycnt == 0)
                  exit(1);

            if ((opflags & (BGRND | ISBGRND)) == BGRND) {
                  warnx("Cannot immediately mount %s:%s, backgrounding",
                      hostp, spec);
                  opflags |= ISBGRND;
                  if (daemon(0, 0) != 0)
                        err(1, "daemon");
            }
            sleep(60);
      }
      freeaddrinfo(ai_nfs);
      nfsargsp->hostname = nam;
      /* Add mounted file system to PATH_MOUNTTAB */
      if (!add_mtab(hostp, spec))
            warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
      return (1);
}


int
getnfs4args(char *spec, struct nfs_args *nfsargsp)
{
      struct addrinfo hints, *ai_nfs, *ai;
      enum tryret ret;
      int ecode, speclen, remoteerr;
      char *hostp, *delimp, *errstr;
      size_t len;
      static char nam[MNAMELEN + 1];

      if ((delimp = strrchr(spec, ':')) != NULL) {
            hostp = spec;
            spec = delimp + 1;
      } else if ((delimp = strrchr(spec, '@')) != NULL) {
            warnx("path@server syntax is deprecated, use server:path");
            hostp = delimp + 1;
      } else {
            warnx("no <host>:<dirpath> nfs-name");
            return (0);
      }
      *delimp = '\0';

      /*
       * If there has been a trailing slash at mounttime it seems
       * that some mountd implementations fail to remove the mount
       * entries from their mountlist while unmounting.
       */
      for (speclen = strlen(spec); 
            speclen > 1 && spec[speclen - 1] == '/';
            speclen--)
            spec[speclen - 1] = '\0';
      if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
            warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
            return (0);
      }
      /* Make both '@' and ':' notations equal */
      if (*hostp != '\0') {
            len = strlen(hostp);
            memmove(nam, hostp, len);
            nam[len] = ':';
            memmove(nam + len + 1, spec, speclen);
            nam[len + speclen + 1] = '\0';
      }

      /*
       * Handle an internet host address.
       */
      memset(&hints, 0, sizeof hints);
      hints.ai_flags = AI_NUMERICHOST;
      hints.ai_socktype = nfsargsp->sotype;
      if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) != 0) {
            hints.ai_flags = 0;
            if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
                != 0) {
                  if (portspec == NULL)
                        errx(1, "%s: %s", hostp, gai_strerror(ecode));
                  else
                        errx(1, "%s:%s: %s", hostp, portspec,
                            gai_strerror(ecode));
                  return (0);
            }
      }

      ret = TRYRET_LOCALERR;
      for (;;) {
            /*
             * Try each entry returned by getaddrinfo(). Note the
             * occurence of remote errors by setting `remoteerr'.
             */
            remoteerr = 0;
            for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
                  if ((ai->ai_family == AF_INET6) &&
                      (opflags & OF_NOINET6))
                        continue;
                  if ((ai->ai_family == AF_INET) && 
                      (opflags & OF_NOINET4))
                        continue;
                  ret = nfs4_tryproto(nfsargsp, ai, hostp, spec, &errstr);
                  if (ret == TRYRET_SUCCESS)
                        break;
                  if (ret != TRYRET_LOCALERR)
                        remoteerr = 1;
                  if ((opflags & ISBGRND) == 0)
                        fprintf(stderr, "%s\n", errstr);
            }
            if (ret == TRYRET_SUCCESS)
                  break;

            /* Exit if all errors were local. */
            if (!remoteerr)
                  exit(1);

            /*
             * If retrycnt == 0, we are to keep retrying forever.
             * Otherwise decrement it, and exit if it hits zero.
             */
            if (retrycnt != 0 && --retrycnt == 0)
                  exit(1);

            if ((opflags & (BGRND | ISBGRND)) == BGRND) {
                  warnx("Cannot immediately mount %s:%s, backgrounding",
                      hostp, spec);
                  opflags |= ISBGRND;
                  if (daemon(0, 0) != 0)
                        err(1, "daemon");
            }
            sleep(60);
      }
      freeaddrinfo(ai_nfs);
      nfsargsp->hostname = nam;
      /* Add mounted file system to PATH_MOUNTTAB */
      if (!add_mtab(hostp, spec))
            warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
      return (1);
}

/*
 * Try to set up the NFS arguments according to the address
 * family, protocol (and possibly port) specified in `ai'.
 *
 * Returns TRYRET_SUCCESS if successful, or:
 *   TRYRET_TIMEOUT           The server did not respond.
 *   TRYRET_REMOTEERR         The server reported an error.
 *   TRYRET_LOCALERR          Local failure.
 *
 * In all error cases, *errstr will be set to a statically-allocated string
 * describing the error.
 */
enum tryret
nfs_tryproto(struct nfs_args *nfsargsp, struct addrinfo *ai, char *hostp,
    char *spec, char **errstr)
{
      static char errbuf[256];
      struct sockaddr_storage nfs_ss;
      struct netbuf nfs_nb;
      struct nfhret nfhret;
      struct timeval try;
      struct rpc_err rpcerr;
      CLIENT *clp;
      struct netconfig *nconf, *nconf_mnt;
      char *netid, *netid_mnt;
      int doconnect, nfsvers, mntvers;
      enum clnt_stat stat;
      enum mountmode trymntmode;

      trymntmode = mountmode;
      errbuf[0] = '\0';
      *errstr = errbuf;

      if ((netid = netidbytype(ai->ai_family, nfsargsp->sotype)) == NULL) {
            snprintf(errbuf, sizeof errbuf,
                "af %d sotype %d not supported", ai->ai_family,
                nfsargsp->sotype);
            return (TRYRET_LOCALERR);
      }
      if ((nconf = getnetconf_cached(netid)) == NULL) {
            snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
            return (TRYRET_LOCALERR);
      }
      /* The RPCPROG_MNT netid may be different. */
      if (mnttcp_ok) {
            netid_mnt = netid;
            nconf_mnt = nconf;
      } else {
            if ((netid_mnt = netidbytype(ai->ai_family, SOCK_DGRAM))
                 == NULL) {
                  snprintf(errbuf, sizeof errbuf,
                      "af %d sotype SOCK_DGRAM not supported",
                       ai->ai_family);
                  return (TRYRET_LOCALERR);
            }
            if ((nconf_mnt = getnetconf_cached(netid_mnt)) == NULL) {
                  snprintf(errbuf, sizeof errbuf, "%s: %s", netid_mnt,
                      nc_sperror());
                  return (TRYRET_LOCALERR);
            }
      }

tryagain:
      if (trymntmode == V2) {
            nfsvers = 2;
            mntvers = 1;
      } else {
            nfsvers = 3;
            mntvers = 3;
      }

      if (portspec != NULL) {
            /* `ai' contains the complete nfsd sockaddr. */
            nfs_nb.buf = ai->ai_addr;
            nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
      } else {
            /* Ask the remote rpcbind. */
            nfs_nb.buf = &nfs_ss;
            nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;

            if (!rpcb_getaddr(RPCPROG_NFS, nfsvers, nconf, &nfs_nb,
                hostp)) {
                  if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
                      trymntmode == ANY) {
                        trymntmode = V2;
                        goto tryagain;
                  }
                  snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
                      netid, hostp, spec,
                      clnt_spcreateerror("RPCPROG_NFS"));
                  return (returncode(rpc_createerr.cf_stat,
                      &rpc_createerr.cf_error));
            }
      }

      /* Check that the server (nfsd) responds on the port we have chosen. */
      clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, RPCPROG_NFS, nfsvers,
          0, 0);
      if (clp == NULL) {
            snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
                hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
            return (returncode(rpc_createerr.cf_stat,
                &rpc_createerr.cf_error));
      }
      if (nfsargsp->sotype == SOCK_DGRAM &&
          !(nfsargsp->flags & NFSMNT_NOCONN)) {
            /*
             * Use connect(), to match what the kernel does. This
             * catches cases where the server responds from the
             * wrong source address.
             */
            doconnect = 1;
            if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
                  clnt_destroy(clp);
                  snprintf(errbuf, sizeof errbuf,
                      "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
                      spec);
                  return (TRYRET_LOCALERR);
            }
      }

      try.tv_sec = 10;
      try.tv_usec = 0;
      stat = clnt_call(clp, NFSPROC_NULL, (xdrproc_t)xdr_void, NULL,
                   (xdrproc_t)xdr_void, NULL,
          try);
      if (stat != RPC_SUCCESS) {
            if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
                  clnt_destroy(clp);
                  trymntmode = V2;
                  goto tryagain;
            }
            clnt_geterr(clp, &rpcerr);
            snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
                hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
            clnt_destroy(clp);
            return (returncode(stat, &rpcerr));
      }
      clnt_destroy(clp);

      /* Send the RPCMNT_MOUNT RPC to get the root filehandle. */
      try.tv_sec = 10;
      try.tv_usec = 0;
      clp = clnt_tp_create(hostp, RPCPROG_MNT, mntvers, nconf_mnt);
      if (clp == NULL) {
            snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
                hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
            return (returncode(rpc_createerr.cf_stat,
                &rpc_createerr.cf_error));
      }
      clp->cl_auth = authsys_create_default();
      nfhret.auth = RPCAUTH_UNIX;
      nfhret.vers = mntvers;
      stat = clnt_call(clp, RPCMNT_MOUNT, (xdrproc_t)xdr_dir, spec, 
                   (xdrproc_t)xdr_fh, &nfhret,
          try);
      auth_destroy(clp->cl_auth);
      if (stat != RPC_SUCCESS) {
            if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
                  clnt_destroy(clp);
                  trymntmode = V2;
                  goto tryagain;
            }
            clnt_geterr(clp, &rpcerr);
            snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
                hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
            clnt_destroy(clp);
            return (returncode(stat, &rpcerr));
      }
      clnt_destroy(clp);

      if (nfhret.stat != 0) {
            snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
                hostp, spec, strerror(nfhret.stat));
            return (TRYRET_REMOTEERR);
      }

      /*
       * Store the filehandle and server address in nfsargsp, making
       * sure to copy any locally allocated structures.
       */
      nfsargsp->addrlen = nfs_nb.len;
      nfsargsp->addr = malloc(nfsargsp->addrlen);
      nfsargsp->fhsize = nfhret.fhsize;
      nfsargsp->fh = malloc(nfsargsp->fhsize);
      if (nfsargsp->addr == NULL || nfsargsp->fh == NULL)
            err(1, "malloc");
      bcopy(nfs_nb.buf, nfsargsp->addr, nfsargsp->addrlen);
      bcopy(nfhret.nfh, nfsargsp->fh, nfsargsp->fhsize);

      if (nfsvers == 3)
            nfsargsp->flags |= NFSMNT_NFSV3;
      else
            nfsargsp->flags &= ~NFSMNT_NFSV3;

      return (TRYRET_SUCCESS);
}


/*
 * Try to set up the NFS arguments according to the address
 * family, protocol (and possibly port) specified in `ai'.
 *
 * Returns TRYRET_SUCCESS if successful, or:
 *   TRYRET_TIMEOUT           The server did not respond.
 *   TRYRET_REMOTEERR         The server reported an error.
 *   TRYRET_LOCALERR          Local failure.
 *
 * In all error cases, *errstr will be set to a statically-allocated string
 * describing the error.
 */
enum tryret
nfs4_tryproto(struct nfs_args *nfsargsp, struct addrinfo *ai, char *hostp,
    char *spec, char **errstr)
{
      static char errbuf[256];
      struct sockaddr_storage nfs_ss;
      struct netbuf nfs_nb;
      struct netconfig *nconf;
      char *netid;
      int nfsvers;

      errbuf[0] = '\0';
      *errstr = errbuf;

      if ((netid = netidbytype(ai->ai_family, nfsargsp->sotype)) == NULL) {
            snprintf(errbuf, sizeof errbuf,
                "af %d sotype %d not supported", ai->ai_family,
                nfsargsp->sotype);
            return (TRYRET_LOCALERR);
      }
      if ((nconf = getnetconf_cached(netid)) == NULL) {
            snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
            return (TRYRET_LOCALERR);
      }

      nfsvers = 4;

      if (portspec != NULL && atoi(portspec) != 0) {
            /* `ai' contains the complete nfsd sockaddr. */
            nfs_nb.buf = ai->ai_addr;
            nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
      } else {
            /* Ask the remote rpcbind. */
            nfs_nb.buf = &nfs_ss;
            nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;

            if (!rpcb_getaddr(RPCPROG_NFS, nfsvers, nconf, &nfs_nb,
                hostp)) {
                  snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
                      netid, hostp, spec,
                      clnt_spcreateerror("RPCPROG_NFS"));
                  return (returncode(rpc_createerr.cf_stat,
                      &rpc_createerr.cf_error));
            }
      }

      /*
       * Store the filehandle and server address in nfsargsp, making
       * sure to copy any locally allocated structures.
       */
      nfsargsp->addrlen = nfs_nb.len;
      nfsargsp->addr = malloc(nfsargsp->addrlen);

      if (nfsargsp->addr == NULL)
            err(1, "malloc");
      bcopy(nfs_nb.buf, nfsargsp->addr, nfsargsp->addrlen);

      /* XXX hack */
      nfsargsp->flags |= (NFSMNT_NFSV3 | NFSMNT_NFSV4);

      return (TRYRET_SUCCESS);
}

/*
 * Catagorise a RPC return status and error into an `enum tryret'
 * return code.
 */
enum tryret
returncode(enum clnt_stat stat, struct rpc_err *rpcerr)
{
      switch (stat) {
      case RPC_TIMEDOUT:
            return (TRYRET_TIMEOUT);
      case RPC_PMAPFAILURE:
      case RPC_PROGNOTREGISTERED:
      case RPC_PROGVERSMISMATCH:
      /* XXX, these can be local or remote. */
      case RPC_CANTSEND:
      case RPC_CANTRECV:
            return (TRYRET_REMOTEERR);
      case RPC_SYSTEMERROR:
            switch (rpcerr->re_errno) {
            case ETIMEDOUT:
                  return (TRYRET_TIMEOUT);
            case ENOMEM:
                  break;
            default:
                  return (TRYRET_REMOTEERR);
            }
            /* FALLTHROUGH */
      default:
            break;
      }
      return (TRYRET_LOCALERR);
}

/*
 * Look up a netid based on an address family and socket type.
 * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
 *
 * XXX there should be a library function for this.
 */
char *
netidbytype(int af, int sotype)
{
      struct nc_protos *p;

      for (p = nc_protos; p->netid != NULL; p++) {
            if (af != p->af || sotype != p->sotype)
                  continue;
            return (p->netid);
      }
      return (NULL);
}

/*
 * Look up a netconfig entry based on a netid, and cache the result so
 * that we don't need to remember to call freenetconfigent().
 *
 * Otherwise it behaves just like getnetconfigent(), so nc_*error()
 * work on failure.
 */
struct netconfig *
getnetconf_cached(const char *netid)
{
      static struct nc_entry {
            struct netconfig *nconf;
            struct nc_entry *next;
      } *head;
      struct nc_entry *p;
      struct netconfig *nconf;

      for (p = head; p != NULL; p = p->next)
            if (strcmp(netid, p->nconf->nc_netid) == 0)
                  return (p->nconf);

      if ((nconf = getnetconfigent(netid)) == NULL)
            return (NULL);
      if ((p = malloc(sizeof(*p))) == NULL)
            err(1, "malloc");
      p->nconf = nconf;
      p->next = head;
      head = p;

      return (p->nconf);
}

/*
 * xdr routines for mount rpc's
 */
int
xdr_dir(XDR *xdrsp, char *dirp)
{
      return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
}

int
xdr_fh(XDR *xdrsp, struct nfhret *np)
{
      int i;
      long auth, authcnt, authfnd = 0;

      if (!xdr_u_long(xdrsp, &np->stat))
            return (0);
      if (np->stat)
            return (1);
      switch (np->vers) {
      case 1:
            np->fhsize = NFSX_V2FH;
            return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH));
      case 3:
            if (!xdr_long(xdrsp, &np->fhsize))
                  return (0);
            if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX)
                  return (0);
            if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
                  return (0);
            if (!xdr_long(xdrsp, &authcnt))
                  return (0);
            for (i = 0; i < authcnt; i++) {
                  if (!xdr_long(xdrsp, &auth))
                        return (0);
                  if (auth == np->auth)
                        authfnd++;
            }
            /*
             * Some servers, such as DEC's OSF/1 return a nil authenticator
             * list to indicate RPCAUTH_UNIX.
             */
            if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX))
                  np->stat = EAUTH;
            return (1);
      };
      return (0);
}

void
usage()
{
      (void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
"usage: mount_nfs [-234bcdiLlNPsTU] [-a maxreadahead] [-D deadthresh]",
"                 [-g maxgroups] [-I readdirsize] [-o options] [-R retrycnt]",
"                 [-r readsize] [-t timeout] [-w writesize] [-x retrans]",
"                 rhost:path node");
      exit(1);
}

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