sbin/mount_nfs/getnfsargs_small.c

   1 /*      $NetBSD: getnfsargs_small.c,v 1.7 2007/03/10 00:30:37 hubertf Exp $     */
   2
   3 /*-
   4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by David Laight.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*-
  33  *  Copyright (c) 1993 John Brezak
  34  *  All rights reserved.
  35  *
  36  *  Redistribution and use in source and binary forms, with or without
  37  *  modification, are permitted provided that the following conditions
  38  *  are met:
  39  *  1. Redistributions of source code must retain the above copyright
  40  *     notice, this list of conditions and the following disclaimer.
  41  *  2. Redistributions in binary form must reproduce the above copyright
  42  *     notice, this list of conditions and the following disclaimer in the
  43  *     documentation and/or other materials provided with the distribution.
  44  *  3. The name of the author may not be used to endorse or promote products
  45  *     derived from this software without specific prior written permission.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
  48  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  49  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  50  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  51  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  52  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  53  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  55  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  56  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  57  * POSSIBILITY OF SUCH DAMAGE.
  58  */
  59
  60 /*
  61  * Copyright (c) 1992, 1993, 1994
  62  *      The Regents of the University of California.  All rights reserved.
  63  *
  64  * This code is derived from software contributed to Berkeley by
  65  * Rick Macklem at The University of Guelph.
  66  *
  67  * Redistribution and use in source and binary forms, with or without
  68  * modification, are permitted provided that the following conditions
  69  * are met:
  70  * 1. Redistributions of source code must retain the above copyright
  71  *    notice, this list of conditions and the following disclaimer.
  72  * 2. Redistributions in binary form must reproduce the above copyright
  73  *    notice, this list of conditions and the following disclaimer in the
  74  *    documentation and/or other materials provided with the distribution.
  75  * 3. Neither the name of the University nor the names of its contributors
  76  *    may be used to endorse or promote products derived from this software
  77  *    without specific prior written permission.
  78  *
  79  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  80  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  81  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  82  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  83  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  84  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  85  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  86  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  87  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  88  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  89  * SUCH DAMAGE.
  90  */
  91
  92 #include <sys/cdefs.h>
  93 __RCSID("$NetBSD: getnfsargs_small.c,v 1.7 2007/03/10 00:30:37 hubertf Exp $");
  94
  95 #include <sys/param.h>
  96 #include <sys/mount.h>
  97 #include <sys/socket.h>
  98 #include <sys/stat.h>
  99 #include <syslog.h>
 100
 101 #include <nfs/rpcv2.h>
 102 #include <nfs/nfsproto.h>
 103 #include <nfs/nfs.h>
 104 #include <nfs/nfsmount.h>
 105
 106 #include <arpa/inet.h>
 107
 108 #include <err.h>
 109 #include <errno.h>
 110 #include <fcntl.h>
 111 #include <netdb.h>
 112 #include <signal.h>
 113 #include <stdio.h>
 114 #include <stdlib.h>
 115 #include <string.h>
 116 #include <unistd.h>
 117 #include <util.h>
 118
 119 #include "mount_nfs.h"
 120
 121 #include "iodesc.h"
 122 typedef int32_t n_long;
 123 #include "rpc.h"
 124
 125 #define RPC_HEADER_WORDS 28     /* more than enough */
 126 #define FNAME_SIZE 512
 127
 128 struct nfhret {
 129         long            fhsize;
 130         u_char          nfh[NFSX_V3FHMAX];
 131 };
 132
 133 /* Ripped from src/sys/arch/i386/stand/libsa/nfs.c */
 134 static int
 135 nfs_getrootfh(struct iodesc *d, const char *path, int mntvers, struct nfhret *nfhret)
 136 {
 137         size_t len;
 138         struct args {
 139                 uint32_t len;
 140                 char    path[FNAME_SIZE];
 141         } *args;
 142         struct repl {
 143                 uint32_t errval;
 144                 u_char  fh[NFSX_V3FHMAX];
 145         } *repl;
 146         struct {
 147                 uint32_t h[RPC_HEADER_WORDS];
 148                 struct args d;
 149         } sdata;
 150         struct {
 151                 uint32_t h[RPC_HEADER_WORDS];
 152                 struct repl d;
 153         } rdata;
 154         ssize_t cc;
 155
 156         args = &sdata.d;
 157         repl = &rdata.d;
 158
 159         memset(args, 0, sizeof(*args));
 160         len = strlen(path);
 161         if (len > sizeof(args->path))
 162                 len = sizeof(args->path);
 163         args->len = htonl(len);
 164         memcpy(args->path, path, len);
 165         len = 4 + roundup(len, 4);
 166
 167         cc = rpc_call(d, RPCPROG_MNT, mntvers, RPCMNT_MOUNT,
 168             args, len, repl, sizeof(*repl));
 169         if (cc == -1) {
 170                 /* errno was set by rpc_call */
 171                 return errno;
 172         }
 173         if (cc < 4)
 174                 return EBADRPC;
 175         if (repl->errval)
 176                 return ntohl(repl->errval);
 177         nfhret->fhsize = cc;
 178         memcpy(nfhret->nfh, repl->fh, sizeof(repl->fh));
 179         return 0;
 180 }
 181
 182 int
 183 getnfsargs(char *spec, struct nfs_args *nfsargsp)
 184 {
 185         struct addrinfo hints, *ai_nfs;
 186         int ecode;
 187         int nfsvers, mntvers;
 188         char *hostp, *delimp;
 189         static struct nfhret nfhret;
 190         static char nam[MNAMELEN + 1];
 191         struct iodesc d;
 192         int nfs_port;
 193
 194         strlcpy(nam, spec, sizeof(nam));
 195         if ((delimp = strchr(spec, '@')) != NULL) {
 196                 hostp = delimp + 1;
 197         } else if ((delimp = strrchr(spec, ':')) != NULL) {
 198                 hostp = spec;
 199                 spec = delimp + 1;
 200         } else {
 201                 warnx("no <host>:<dirpath> or <dirpath>@<host> spec");
 202                 return 0;
 203         }
 204         *delimp = '\0';
 205
 206         memset(&hints, 0, sizeof hints);
 207         hints.ai_socktype = nfsargsp->sotype;
 208
 209         if ((ecode = getaddrinfo(hostp, "nfs", &hints, &ai_nfs)) != 0) {
 210                 warnx("can't get net id for host \"%s\": %s", hostp,
 211                     gai_strerror(ecode));
 212                 return 0;
 213         }
 214
 215         if ((nfsargsp->flags & NFSMNT_NFSV3) != 0) {
 216                 nfsvers = NFS_VER3;
 217                 mntvers = RPCMNT_VER3;
 218         } else {
 219                 nfsvers = NFS_VER2;
 220                 mntvers = RPCMNT_VER1;
 221         }
 222
 223         d.socket = -1;
 224         for (d.ai = ai_nfs; ; d.ai = d.ai->ai_next) {
 225                 if (d.ai == NULL) {
 226                         if (nfsvers == NFS_VER3 && !force3) {
 227                                 nfsvers = NFS_VER2;
 228                                 mntvers = RPCMNT_VER1;
 229                                 d.ai = ai_nfs;
 230                                 continue;
 231                         }
 232                         return 0;
 233                 }
 234                 nfs_port = rpc_getport(&d, RPCPROG_NFS, nfsvers);
 235                 if (nfs_port == -1)
 236                         continue;
 237                 if (nfs_getrootfh(&d, spec, mntvers, &nfhret) == 0)
 238                         break;
 239         }
 240
 241         if (port != 0)
 242                 nfs_port = port;
 243         set_port(d.ai->ai_addr, htons(nfs_port));
 244
 245         nfsargsp->hostname = nam;
 246         nfsargsp->addr = d.ai->ai_addr;
 247         nfsargsp->addrlen = d.ai->ai_addrlen;
 248
 249         nfsargsp->fh = nfhret.nfh;
 250         if (nfsvers == NFS_VER3) {
 251                 nfsargsp->fhsize = ntohl(*(uint32_t *)nfhret.nfh);
 252                 nfsargsp->fh += 4;
 253         } else {
 254                 nfsargsp->fhsize = NFSX_V2FH;
 255                 nfsargsp->flags &= ~NFSMNT_NFSV3;
 256         }
 257         return 1;
 258 }