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mount_nfs.c

/*
 * Copyright (c) 1999-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.0 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License."
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 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.
 */


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

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

#ifdef ISO
#include <netiso/iso.h>
#endif

#ifdef NFSKERB
#include <kerberosIV/des.h>
#include <kerberosIV/krb.h>
#endif

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

#include <arpa/inet.h>

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

#include "mntopts.h"

#define     ALTF_BG           0x1
#define ALTF_NOCONN     0x2
#define ALTF_DUMBTIMR   0x4
#define ALTF_INTR 0x8
#define ALTF_KERB 0x10
#define ALTF_NFSV3      0x20
#define ALTF_RDIRPLUS   0x40
#define     ALTF_MNTUDP 0x80
#define ALTF_RESVPORT   0x100
#define ALTF_SEQPACKET  0x200
#define ALTF_UDP  0x400
#define ALTF_SOFT 0x800
#define ALTF_TCP  0x1000
#define ALTF_NFSV2      0x2000
#define ALTF_NOLOCKS    0x4000
#define ALTF_ATTRCACHE  0x8000
#define ALTF_RSIZE      0x10000
#define ALTF_WSIZE      0x20000
#define ALTF_READAHEAD  0x40000
#define ALTF_NFSVERS    0x80000
#define ALTF_TIMEO      0x100000
#define ALTF_RETRANS    0x200000

struct mntopt mopts[] = {
      MOPT_STDOPTS,
      MOPT_FORCE,
      MOPT_UPDATE,
      { "bg", 0, ALTF_BG, 1 },
      { "conn", 1, ALTF_NOCONN, 1 },
      { "dumbtimer", 0, ALTF_DUMBTIMR, 1 },
      { "intr", 0, ALTF_INTR, 1 },
#ifdef NFSKERB
      { "kerb", 0, ALTF_KERB, 1 },
#endif
      { "nfsv3", 0, ALTF_NFSV3, 1 },
      { "rdirplus", 0, ALTF_RDIRPLUS, 1 },
      { "mntudp", 0, ALTF_MNTUDP, 1 },
      { "resvport", 0, ALTF_RESVPORT, 1 },
#ifdef ISO
      { "seqpacket", 0, ALTF_SEQPACKET, 1 },
#endif
      { "udp", 0, ALTF_UDP, 1 },
      { "soft", 0, ALTF_SOFT, 1 },
      { "tcp", 0, ALTF_TCP, 1 },
      { "nfsv2", 0, ALTF_NFSV2, 1 },
      { "acregmin=", 0, ALTF_ATTRCACHE, 1 },
      { "acregmax=", 0, ALTF_ATTRCACHE, 1 },
      { "acdirmin=", 0, ALTF_ATTRCACHE, 1 },
      { "acdirmax=", 0, ALTF_ATTRCACHE, 1 },
      { "actimeo=", 0, ALTF_ATTRCACHE, 1 },
      { "ac", 1, ALTF_ATTRCACHE, 1 },
      { "locks", 1, ALTF_NOLOCKS, 1 },
      { "lockd", 1, ALTF_NOLOCKS, 1 },
      { "lock", 1, ALTF_NOLOCKS, 1 },
      { "nlm", 1, ALTF_NOLOCKS, 1 },
      { "rsize=", 0, ALTF_RSIZE, 1 },
      { "wsize=", 0, ALTF_WSIZE, 1 },
      { "rwsize=", 0, ALTF_RSIZE|ALTF_WSIZE, 1 },
      { "readahead=", 0, ALTF_READAHEAD, 1 },
      { "nfsvers=", 0, ALTF_NFSVERS, 1 },
      { "vers=", 0, ALTF_NFSVERS, 1 },
      { "timeo=", 0, ALTF_TIMEO, 1 },
      { "retrans=", 0, ALTF_RETRANS, 1 },
      { NULL }
};

struct nfs_args nfsdefargs = {
      NFS_ARGSVERSION,
      (struct sockaddr *)0,
      sizeof (struct sockaddr_in),
      SOCK_DGRAM,
      0,
      (u_char *)0,
      0,
      NFSMNT_NFSV3,
      NFS_WSIZE,
      NFS_RSIZE,
      NFS_READDIRSIZE,
      10,
      NFS_RETRANS,
      NFS_MAXGRPS,
      NFS_DEFRAHEAD,
      0,
      0,
      (char *)0,
      NFS_MINATTRTIMO,
      NFS_MAXATTRTIMO,
      NFS_MINDIRATTRTIMO,
      NFS_MAXDIRATTRTIMO,
};

struct nfhret {
      u_long            stat;
      long        vers;
      long        auth;
      long        fhsize;
      u_char            nfh[NFSX_V3FHMAX];
};
#define     DEF_RETRY   10000
#define     BGRND 1
#define     ISBGRND     2
int retrycnt = DEF_RETRY;
int opflags = 0;
int nfsproto = IPPROTO_UDP;
int mnttcp_ok = 1;
int force2 = 0;
int force3 = 0;

#ifdef NFSKERB
char inst[INST_SZ];
char realm[REALM_SZ];
struct {
      u_long            kind;
      KTEXT_ST    kt;
} ktick;
struct nfsrpc_nickverf kverf;
struct nfsrpc_fullblock kin, kout;
NFSKERBKEY_T kivec;
CREDENTIALS kcr;
struct timeval ktv;
NFSKERBKEYSCHED_T kerb_keysched;
#endif

uid_t real_uid, eff_uid;

int   getnfsargs __P((char *, struct nfs_args *));
#ifdef ISO
struct      iso_addr *iso_addr __P((const char *));
#endif
void  set_rpc_maxgrouplist __P((int));
__dead      void usage __P((void));
int   xdr_dir __P((XDR *, char *));
int   xdr_fh __P((XDR *, struct nfhret *));

int
main(argc, argv)
      int argc;
      char *argv[];
{
      register int c;
      register struct nfs_args *nfsargsp;
      struct nfs_args nfsargs;
      struct nfsd_cargs ncd;
      int mntflags, altflags, i, nfssvc_flag, num;
      char name[MAXPATHLEN], *p, *p2, *spec;
#ifdef NFSKERB
      uid_t last_ruid;

      last_ruid = -1;
      (void)strcpy(realm, KRB_REALM);
      if (sizeof (struct nfsrpc_nickverf) != RPCX_NICKVERF ||
          sizeof (struct nfsrpc_fullblock) != RPCX_FULLBLOCK ||
          ((char *)&ktick.kt) - ((char *)&ktick) != NFSX_UNSIGNED ||
          ((char *)ktick.kt.dat) - ((char *)&ktick) != 2 * NFSX_UNSIGNED)
            fprintf(stderr, "Yikes! NFSKERB structs not packed!!\n");
#endif /* NFSKERB */

      /* drop setuid root privs asap */
      eff_uid = geteuid();
      real_uid = getuid();
      seteuid(real_uid); 

      retrycnt = DEF_RETRY;

      mntflags = 0;
      altflags = 0;
      nfsargs = nfsdefargs;
      nfsargsp = &nfsargs;
      while ((c = getopt(argc, argv,
          "23a:bcdD:g:I:iKLlm:o:PpqR:r:sTt:Uw:x:")) != EOF)
            switch (c) {
            case '3':
                  if (force2)
                        errx(1, "-2 and -3 are mutually exclusive");
                  force3 = 1;
                  break;
            case '2':
                  if (force3)
                        errx(1, "-2 and -3 are mutually exclusive");
                  force2 = 1;
                  nfsargsp->flags &= ~NFSMNT_NFSV3;
                  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':
                  warnx("NQNFS not supported; -D option deprecated");
                  break;
            case 'd':
                  nfsargsp->flags |= NFSMNT_DUMBTIMR;
                  break;
            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;
            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;
#ifdef NFSKERB
            case 'K':
                  nfsargsp->flags |= NFSMNT_KERB;
                  break;
#endif
            case 'L':
                  nfsargsp->flags |= NFSMNT_NOLOCKS;
                  break;
            case 'l':
                  nfsargsp->flags |= NFSMNT_RDIRPLUS;
                  break;
#ifdef NFSKERB
            case 'm':
                  (void)strncpy(realm, optarg, REALM_SZ - 1);
                  realm[REALM_SZ - 1] = '\0';
                  break;
#endif
            case 'o':
                  getmntopts(optarg, mopts, &mntflags, &altflags);
                  if(altflags & ALTF_BG)
                        opflags |= BGRND;
                  if(altflags & ALTF_NOCONN)
                        nfsargsp->flags |= NFSMNT_NOCONN;
                  if(altflags & ALTF_DUMBTIMR)
                        nfsargsp->flags |= NFSMNT_DUMBTIMR;
                  if(altflags & ALTF_INTR)
                        nfsargsp->flags |= NFSMNT_INT;
#ifdef NFSKERB
                  if(altflags & ALTF_KERB)
                        nfsargsp->flags |= NFSMNT_KERB;
#endif
                  if(altflags & ALTF_NFSV3) {
                        if (force2)
                              errx(1,"conflicting NFS version options");
                        force3 = 1;
                  }
                  if(altflags & ALTF_NFSV2) {
                        if (force3)
                              errx(1,"conflicting NFS version options");
                        force2 = 1;
                        nfsargsp->flags &= ~NFSMNT_NFSV3;
                  }
                  if(altflags & ALTF_RDIRPLUS)
                        nfsargsp->flags |= NFSMNT_RDIRPLUS;
                  if(altflags & ALTF_MNTUDP)
                        mnttcp_ok = 0;
                  if(altflags & ALTF_RESVPORT)
                        nfsargsp->flags |= NFSMNT_RESVPORT;
#ifdef ISO
                  if(altflags & ALTF_SEQPACKET)
                        nfsargsp->sotype = SOCK_SEQPACKET;
#endif
                  if(altflags & ALTF_SOFT)
                        nfsargsp->flags |= NFSMNT_SOFT;
                  if(altflags & ALTF_UDP) {
                        nfsargsp->sotype = SOCK_DGRAM;
                        nfsproto = IPPROTO_UDP;
                  }
                  if(altflags & ALTF_TCP) {
                        nfsargsp->sotype = SOCK_STREAM;
                        nfsproto = IPPROTO_TCP;
                  }
                  if(altflags & ALTF_NOLOCKS)
                        nfsargsp->flags |= NFSMNT_NOLOCKS;
                  if(altflags & ALTF_ATTRCACHE) {
                        if ((p = strcasestr(optarg, "actimeo="))) {
                              p2 = strchr(p, '=') + 1;
                              num = strtol(p2, &p, 10);
                              if ((num < 0) || ((*p != '\0') && (*p != ',')))
                                    errx(1, "illegal actimeo value -- %s", p2);
                              nfsargsp->acregmin = num;
                              nfsargsp->acregmax = nfsargsp->acregmin;
                              nfsargsp->acdirmin = nfsargsp->acregmin;
                              nfsargsp->acdirmax = nfsargsp->acregmin;
                              nfsargsp->flags |= NFSMNT_ACREGMIN;
                              nfsargsp->flags |= NFSMNT_ACREGMAX;
                              nfsargsp->flags |= NFSMNT_ACDIRMIN;
                              nfsargsp->flags |= NFSMNT_ACDIRMAX;
                        }
                        if ((p = strcasestr(optarg, "acregmin="))) {
                              p2 = strchr(p, '=') + 1;
                              num = strtol(p2, &p, 10);
                              if ((num < 0) || ((*p != '\0') && (*p != ',')))
                                    errx(1, "illegal acregmin value -- %s", p2);
                              nfsargsp->acregmin = num;
                              nfsargsp->flags |= NFSMNT_ACREGMIN;
                        }
                        if ((p = strcasestr(optarg, "acregmax="))) {
                              p2 = strchr(p, '=') + 1;
                              num = strtol(p2, &p, 10);
                              if ((num < 0) || ((*p != '\0') && (*p != ',')))
                                    errx(1, "illegal acregmax value -- %s", p2);
                              nfsargsp->acregmax = num;
                              nfsargsp->flags |= NFSMNT_ACREGMAX;
                        }
                        if ((p = strcasestr(optarg, "acdirmin="))) {
                              p2 = strchr(p, '=') + 1;
                              num = strtol(p2, &p, 10);
                              if ((num < 0) || ((*p != '\0') && (*p != ',')))
                                    errx(1, "illegal acdirmin value -- %s", p2);
                              nfsargsp->acdirmin = num;
                              nfsargsp->flags |= NFSMNT_ACDIRMIN;
                        }
                        if ((p = strcasestr(optarg, "acdirmax="))) {
                              p2 = strchr(p, '=') + 1;
                              num = strtol(p2, &p, 10);
                              if ((num < 0) || ((*p != '\0') && (*p != ',')))
                                    errx(1, "illegal acdirmax value -- %s", p2);
                              nfsargsp->acdirmax = num;
                              nfsargsp->flags |= NFSMNT_ACDIRMAX;
                        }
                        if ((p = strcasestr(optarg, "noac"))) {
                              nfsargsp->acregmin = 0;
                              nfsargsp->acregmax = 0;
                              nfsargsp->acdirmin = 0;
                              nfsargsp->acdirmax = 0;
                              nfsargsp->flags |= NFSMNT_ACREGMIN;
                              nfsargsp->flags |= NFSMNT_ACREGMAX;
                              nfsargsp->flags |= NFSMNT_ACDIRMIN;
                              nfsargsp->flags |= NFSMNT_ACDIRMAX;
                        }
                  }
                  if(altflags & ALTF_RSIZE) {
                        p = strcasestr(optarg, "rwsize=");
                        if (!p)
                              p = strcasestr(optarg, "rsize=");
                        if (p) {
                              p2 = strchr(p, '=') + 1;
                              num = strtol(p2, &p, 10);
                              if ((*p == 'k') || (*p == 'K')) {
                                    num *= 1024;
                                    p++;
                              }
                              if ((num <= 0) || ((*p != '\0') && (*p != ',')))
                                    errx(1, "illegal rsize value -- %s", p2);
                              nfsargsp->rsize = num;
                              nfsargsp->flags |= NFSMNT_RSIZE;
                        }
                  }
                  if(altflags & ALTF_WSIZE) {
                        p = strcasestr(optarg, "rwsize=");
                        if (!p)
                              p = strcasestr(optarg, "wsize=");
                        if (p) {
                              p2 = strchr(p, '=') + 1;
                              num = strtol(p2, &p, 10);
                              if ((*p == 'k') || (*p == 'K')) {
                                    num *= 1024;
                                    p++;
                              }
                              if ((num <= 0) || ((*p != '\0') && (*p != ',')))
                                    errx(1, "illegal wsize value -- %s", p2);
                              nfsargsp->wsize = num;
                              nfsargsp->flags |= NFSMNT_WSIZE;
                        }
                  }
                  if(altflags & ALTF_READAHEAD) {
                        if ((p = strcasestr(optarg, "readahead="))) {
                              p2 = strchr(p, '=') + 1;
                              num = strtol(p2, &p, 10);
                              if ((num < 0) || ((*p != '\0') && (*p != ',')))
                                    errx(1, "illegal readahead value -- %s", p2);
                              nfsargsp->readahead = num;
                              nfsargsp->flags |= NFSMNT_READAHEAD;
                        }
                  }
                  if(altflags & ALTF_NFSVERS) {
                        if ((p = strcasestr(optarg, "vers="))) {
                              p2 = strchr(p, '=') + 1;
                              num = strtol(p2, &p, 10);
                              if ((*p != '\0') && (*p != ','))
                                    num = 0;
                              switch (num) {
                              case 2:
                                    if (force3)
                                          errx(1, "conflicting NFS version options");
                                    force2 = 1;
                                    nfsargsp->flags &= ~NFSMNT_NFSV3;
                                    break;
                              case 3:
                                    if (force2)
                                          errx(1, "conflicting NFS version options");
                                    force3 = 1;
                                    break;
                              default:
                                    errx(1, "illegal NFS version value -- %s", p2);
                                    break;
                              }
                        }
                  }
                  if(altflags & ALTF_TIMEO) {
                        /* need to make sure not to accidentally grab "actimeo=" */
                        p = optarg - 1;
                        do {
                              p++;
                              p = strcasestr(p, "timeo=");
                        } while (p && (p > optarg) && (*(p-1) != ','));
                        if (p) {
                              p2 = strchr(p, '=') + 1;
                              num = strtol(p2, &p, 10);
                              if ((num <= 0) || ((*p != '\0') && (*p != ',')))
                                    errx(1, "illegal timeout value -- %s", p2);
                              nfsargsp->timeo = num;
                              nfsargsp->flags |= NFSMNT_TIMEO;
                        }
                  }
                  if(altflags & ALTF_RETRANS) {
                        if ((p = strcasestr(optarg, "retrans="))) {
                              p2 = strchr(p, '=') + 1;
                              num = strtol(p2, &p, 10);
                              if ((num <= 0) || ((*p != '\0') && (*p != ',')))
                                    errx(1, "illegal retrans value -- %s", p2);
                              nfsargsp->retrans = num;
                              nfsargsp->flags |= NFSMNT_RETRANS;
                        }
                  }
                  altflags = 0;
                  break;
            case 'P':
                  nfsargsp->flags |= NFSMNT_RESVPORT;
                  break;
#ifdef ISO
            case 'p':
                  nfsargsp->sotype = SOCK_SEQPACKET;
                  break;
#endif
            case 'q':
                  warnx("NQNFS not supported; -q option deprecated");
                  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 == 'k') || (*p == 'K')) {
                        num *= 1024;
                        p++;
                  }
                  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 == 'k') || (*p == 'K')) {
                        num *= 1024;
                        p++;
                  }
                  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;
                  break;
            default:
                  usage();
                  break;
            }
      argc -= optind;
      argv += optind;

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

      spec = *argv++;

      if (realpath(*argv, name) == NULL)
            err(1, "realpath %s", name);

      if (!getnfsargs(spec, nfsargsp))
            exit(1);

      if (mount("nfs", name, mntflags, nfsargsp))
            err(1, "%s", name);
      if (nfsargsp->flags & NFSMNT_KERB) {
            if ((opflags & ISBGRND) == 0) {
                  if (i = fork()) {
                        if (i == -1)
                              err(1, "nfskerb 1");
                        exit(0);
                  }
                  (void) setsid();
                  (void) close(STDIN_FILENO);
                  (void) close(STDOUT_FILENO);
                  (void) close(STDERR_FILENO);
                  (void) chdir("/");
            }
            openlog("mount_nfs:", LOG_PID, LOG_DAEMON);
            nfssvc_flag = NFSSVC_MNTD;
            ncd.ncd_dirp = name;
            while (nfssvc(nfssvc_flag, (caddr_t)&ncd) < 0) {
                  if (errno != ENEEDAUTH) {
                        syslog(LOG_ERR, "nfssvc err %m");
                        continue;
                  }
                  nfssvc_flag =
                      NFSSVC_MNTD | NFSSVC_GOTAUTH | NFSSVC_AUTHINFAIL;
#ifdef NFSKERB
                  /*
                   * Set up as ncd_authuid for the kerberos call.
                   * Must set ruid to ncd_authuid and reset the
                   * ticket name iff ncd_authuid is not the same
                   * as last time, so that the right ticket file
                   * is found.
                   * Get the Kerberos credential structure so that
                   * we have the seesion key and get a ticket for
                   * this uid.
                   * For more info see the IETF Draft "Authentication
                   * in ONC RPC".
                   */
                  if (ncd.ncd_authuid != last_ruid) {
                        krb_set_tkt_string("");
                        last_ruid = ncd.ncd_authuid;
                  }
                  setreuid(ncd.ncd_authuid, 0);
                  kret = krb_get_cred(NFS_KERBSRV, inst, realm, &kcr);
                  if (kret == RET_NOTKT) {
                        kret = get_ad_tkt(NFS_KERBSRV, inst, realm,
                        DEFAULT_TKT_LIFE);
                      if (kret == KSUCCESS)
                        kret = krb_get_cred(NFS_KERBSRV, inst, realm,
                            &kcr);
                  }
                  if (kret == KSUCCESS)
                      kret = krb_mk_req(&ktick.kt, NFS_KERBSRV, inst,
                        realm, 0);

                  /*
                   * Fill in the AKN_FULLNAME authenticator and verfier.
                   * Along with the Kerberos ticket, we need to build
                   * the timestamp verifier and encrypt it in CBC mode.
                   */
                  if (kret == KSUCCESS &&
                      ktick.kt.length <= (RPCAUTH_MAXSIZ-3*NFSX_UNSIGNED)
                      && gettimeofday(&ktv, (struct timezone *)0) == 0) {
                      ncd.ncd_authtype = RPCAUTH_KERB4;
                      ncd.ncd_authstr = (u_char *)&ktick;
                      ncd.ncd_authlen = nfsm_rndup(ktick.kt.length) +
                        3 * NFSX_UNSIGNED;
                      ncd.ncd_verfstr = (u_char *)&kverf;
                      ncd.ncd_verflen = sizeof (kverf);
                      memmove(ncd.ncd_key, kcr.session,
                        sizeof (kcr.session));
                      kin.t1 = htonl(ktv.tv_sec);
                      kin.t2 = htonl(ktv.tv_usec);
                      kin.w1 = htonl(NFS_KERBTTL);
                      kin.w2 = htonl(NFS_KERBTTL - 1);
                      bzero((caddr_t)kivec, sizeof (kivec));

                      /*
                       * Encrypt kin in CBC mode using the session
                       * key in kcr.
                       */
                      XXX

                      /*
                       * Finally, fill the timestamp verifier into the
                       * authenticator and verifier.
                       */
                      ktick.kind = htonl(RPCAKN_FULLNAME);
                      kverf.kind = htonl(RPCAKN_FULLNAME);
                      NFS_KERBW1(ktick.kt) = kout.w1;
                      ktick.kt.length = htonl(ktick.kt.length);
                      kverf.verf.t1 = kout.t1;
                      kverf.verf.t2 = kout.t2;
                      kverf.verf.w2 = kout.w2;
                      nfssvc_flag = NFSSVC_MNTD | NFSSVC_GOTAUTH;
                  }
                  setreuid(0, 0);
#endif /* NFSKERB */
            }
      }
      exit(0);
}

int
getnfsargs(spec, nfsargsp)
      char *spec;
      struct nfs_args *nfsargsp;
{
      register CLIENT *clp;
      struct hostent *hp;
      static struct sockaddr_in saddr;
#ifdef ISO
      static struct sockaddr_iso isoaddr;
      struct iso_addr *isop;
      int isoflag = 0;
#endif
      struct timeval pertry, try;
      enum clnt_stat clnt_stat;
      int so = RPC_ANYSOCK, i, nfsvers, mntvers, orgcnt;
      char *hostp, *delimp;
#ifdef NFSKERB
      char *cp;
#endif
      u_short tport = 0;
      static struct nfhret nfhret;
      static char nam[MNAMELEN + 1];

      strncpy(nam, spec, MNAMELEN);
      nam[MNAMELEN] = '\0';
      if ((delimp = strchr(spec, '@')) != NULL) {
            hostp = delimp + 1;
      } else if ((delimp = strchr(spec, ':')) != NULL) {
            hostp = spec;
            spec = delimp + 1;
      } else {
            warnx("no <host>:<dirpath> or <dirpath>@<host> spec");
            return (0);
      }
      *delimp = '\0';
      /*
       * DUMB!! Until the mount protocol works on iso transport, we must
       * supply both an iso and an inet address for the host.
       */
#ifdef ISO
      if (!strncmp(hostp, "iso=", 4)) {
            u_short isoport;

            hostp += 4;
            isoflag++;
            if ((delimp = strchr(hostp, '+')) == NULL) {
                  warnx("no iso+inet address");
                  return (0);
            }
            *delimp = '\0';
            if ((isop = iso_addr(hostp)) == NULL) {
                  warnx("bad ISO address");
                  return (0);
            }
            memset(&isoaddr, 0, sizeof (isoaddr));
            memmove(&isoaddr.siso_addr, isop, sizeof (struct iso_addr));
            isoaddr.siso_len = sizeof (isoaddr);
            isoaddr.siso_family = AF_ISO;
            isoaddr.siso_tlen = 2;
            isoport = htons(NFS_PORT);
            memmove(TSEL(&isoaddr), &isoport, isoaddr.siso_tlen);
            hostp = delimp + 1;
      }
#endif /* ISO */

      /*
       * Handle an internet host address and reverse resolve it if
       * doing Kerberos.
       */
      if (isdigit(*hostp)) {
            if ((saddr.sin_addr.s_addr = inet_addr(hostp)) == -1) {
                  warnx("bad net address %s", hostp);
                  return (0);
            }
      } else if ((hp = gethostbyname(hostp)) != NULL)
            memmove(&saddr.sin_addr, hp->h_addr, hp->h_length);
      else {
            warnx("can't get net id for host");
            return (0);
        }
#ifdef NFSKERB
      if ((nfsargsp->flags & NFSMNT_KERB)) {
            if ((hp = gethostbyaddr((char *)&saddr.sin_addr.s_addr,
                sizeof (u_long), AF_INET)) == (struct hostent *)0) {
                  warnx("can't reverse resolve net address");
                  return (0);
            }
            memmove(&saddr.sin_addr, hp->h_addr, hp->h_length);
            strncpy(inst, hp->h_name, INST_SZ);
            inst[INST_SZ - 1] = '\0';
            if (cp = strchr(inst, '.'))
                  *cp = '\0';
      }
#endif /* NFSKERB */

      if (force2) {
            nfsvers = NFS_VER2;
            mntvers = RPCMNT_VER1;
      } else {
            nfsvers = NFS_VER3;
            mntvers = RPCMNT_VER3;
      }
      orgcnt = retrycnt;
tryagain:
      nfhret.stat = EACCES;   /* Mark not yet successful */
      while (retrycnt > 0) {
            saddr.sin_family = AF_INET;
            saddr.sin_port = htons(PMAPPORT);
            if ((tport = pmap_getport(&saddr, RPCPROG_NFS,
                nfsvers, nfsproto)) == 0) {
                  if ((opflags & ISBGRND) == 0)
                        clnt_pcreateerror("NFS Portmap");
            } else {
                  saddr.sin_port = 0;
                  pertry.tv_sec = 10;
                  pertry.tv_usec = 0;
                  /*
                   * temporarily revert to root, to avoid reserved port
                   * number restriction (port# less than 1024)
                   */
                  seteuid(eff_uid);
                  if (mnttcp_ok && nfsargsp->sotype == SOCK_STREAM)
                      clp = clnttcp_create(&saddr, RPCPROG_MNT, mntvers,
                        &so, 0, 0);
                  else
                      clp = clntudp_create(&saddr, RPCPROG_MNT, mntvers,
                        pertry, &so);
                  seteuid(real_uid);
                  if (clp == NULL) {
                        if ((opflags & ISBGRND) == 0)
                              clnt_pcreateerror("Cannot MNT RPC");
                  } else {
                        clp->cl_auth = authunix_create_default();
                        try.tv_sec = 10;
                        try.tv_usec = 0;
                        if (nfsargsp->flags & NFSMNT_KERB)
                            nfhret.auth = RPCAUTH_KERB4;
                        else
                            nfhret.auth = RPCAUTH_UNIX;
                        nfhret.vers = mntvers;
                        clnt_stat = clnt_call(clp, RPCMNT_MOUNT,
                            xdr_dir, spec, xdr_fh, &nfhret, try);
                        switch (clnt_stat) {
                        case RPC_PROGVERSMISMATCH:
                              if (nfsvers == NFS_VER3 && !force3) {
                                    retrycnt = orgcnt;
                                    nfsvers = NFS_VER2;
                                    mntvers = RPCMNT_VER1;
                                    nfsargsp->flags &=
                                          ~NFSMNT_NFSV3;
                                    goto tryagain;
                              } else {
                                    errx(1, "%s", clnt_sperror(clp,
                                          "MNT RPC"));
                              }
                        case RPC_SUCCESS:
                              auth_destroy(clp->cl_auth);
                              clnt_destroy(clp);
                              retrycnt = 0;
                              break;
                        default:
                              /* XXX should give up on some errors */
                              if ((opflags & ISBGRND) == 0)
                                    warnx("%s", clnt_sperror(clp,
                                        "bad MNT RPC"));
                              break;
                        }
                  }
            }
            if (--retrycnt > 0) {
                  if (opflags & BGRND) {
                        opflags &= ~BGRND;
                        if (i = fork()) {
                              if (i == -1)
                                    err(1, "nfskerb 2");
                              exit(0);
                        }
                        (void) setsid();
                        (void) close(STDIN_FILENO);
                        (void) close(STDOUT_FILENO);
                        (void) close(STDERR_FILENO);
                        (void) chdir("/");
                        opflags |= ISBGRND;
                  }
                  sleep(60);
            }
      }
      if (nfhret.stat) {
            if (opflags & ISBGRND)
                  exit(1);
            warnx("can't access %s: %s", spec, strerror(nfhret.stat));
            return (0);
      }
      saddr.sin_port = htons(tport);
#ifdef ISO
      if (isoflag) {
            nfsargsp->addr = (struct sockaddr *) &isoaddr;
            nfsargsp->addrlen = sizeof (isoaddr);
      } else
#endif /* ISO */
      {
            nfsargsp->addr = (struct sockaddr *) &saddr;
            nfsargsp->addrlen = sizeof (saddr);
      }
      nfsargsp->fh = nfhret.nfh;
      nfsargsp->fhsize = nfhret.fhsize;
      nfsargsp->hostname = nam;
      return (1);
}

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

int
xdr_fh(xdrsp, np)
      XDR *xdrsp;
      register struct nfhret *np;
{
      register 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);
}

__dead void
usage()
{
      (void)fprintf(stderr, "usage: mount_nfs %s\n%s\n%s\n%s\n",
"[-23bcdiKkLlMPsT] [-a maxreadahead]",
"\t[-g maxgroups] [-m realm] [-o options] [-R retrycnt]",
"\t[-r readsize] [-t timeout] [-w writesize] [-x retrans]",
"\trhost:path node");
      exit(1);
}

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