external/bsd/am-utils/dist/amd/amfs_program.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1997-2009 Erez Zadok
   5  * Copyright (c) 1989 Jan-Simon Pendry
   6  * Copyright (c) 1989 Imperial College of Science, Technology & Medicine
   7  * Copyright (c) 1989 The Regents of the University of California.
   8  * All rights reserved.
   9  *
  10  * This code is derived from software contributed to Berkeley by
  11  * Jan-Simon Pendry at Imperial College, London.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgment:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  *
  41  *
  42  * File: am-utils/amd/amfs_program.c
  43  *
  44  */
  45
  46 /*
  47  * Program file system
  48  */
  49
  50 #ifdef HAVE_CONFIG_H
  51 # include <config.h>
  52 #endif /* HAVE_CONFIG_H */
  53 #include <am_defs.h>
  54 #include <amd.h>
  55
  56 /* forward definitions */
  57 static char *amfs_program_match(am_opts *fo);
  58 static int amfs_program_mount(am_node *am, mntfs *mf);
  59 static int amfs_program_umount(am_node *am, mntfs *mf);
  60 static int amfs_program_init(mntfs *mf);
  61
  62 /*
  63  * Ops structure
  64  */
  65 am_ops amfs_program_ops =
  66 {
  67   "program",
  68   amfs_program_match,
  69   amfs_program_init,
  70   amfs_program_mount,
  71   amfs_program_umount,
  72   amfs_error_lookup_child,
  73   amfs_error_mount_child,
  74   amfs_error_readdir,
  75   0,                            /* amfs_program_readlink */
  76   0,                            /* amfs_program_mounted */
  77   0,                            /* amfs_program_umounted */
  78   amfs_generic_find_srvr,
  79   0,                            /* amfs_program_get_wchan */
  80   FS_MKMNT | FS_BACKGROUND | FS_AMQINFO,        /* nfs_fs_flags */
  81 #ifdef HAVE_FS_AUTOFS
  82   AUTOFS_PROGRAM_FS_FLAGS,
  83 #endif /* HAVE_FS_AUTOFS */
  84 };
  85
  86
  87 /*
  88  * Execute needs a mount and unmount command.
  89  */
  90 static char *
  91 amfs_program_match(am_opts *fo)
  92 {
  93   char *prog;
  94
  95   if (fo->opt_unmount && fo->opt_umount) {
  96     plog(XLOG_ERROR, "program: cannot specify both unmount and umount options");
  97     return 0;
  98   }
  99   if (!fo->opt_mount) {
 100     plog(XLOG_ERROR, "program: must specify mount command");
 101     return 0;
 102   }
 103   if (!fo->opt_unmount && !fo->opt_umount) {
 104     fo->opt_unmount = str3cat(NULL, UNMOUNT_PROGRAM, " umount ", fo->opt_fs);
 105     plog(XLOG_INFO, "program: un/umount not specified; using default \"%s\"",
 106          fo->opt_unmount);
 107   }
 108   prog = strchr(fo->opt_mount, ' ');
 109
 110   return strdup(prog ? prog + 1 : fo->opt_mount);
 111 }
 112
 113
 114 static int
 115 amfs_program_init(mntfs *mf)
 116 {
 117   /* check if already saved value */
 118   if (mf->mf_private != NULL)
 119     return 0;
 120
 121   /* save unmount (or umount) command */
 122   if (mf->mf_fo->opt_unmount != NULL)
 123     mf->mf_private = (opaque_t) strdup(mf->mf_fo->opt_unmount);
 124   else
 125     mf->mf_private = (opaque_t) strdup(mf->mf_fo->opt_umount);
 126   mf->mf_prfree = (void (*)(opaque_t)) free;
 127
 128   return 0;
 129 }
 130
 131
 132 static int
 133 amfs_program_exec(char *info)
 134 {
 135   char **xivec;
 136   int error;
 137
 138   /*
 139    * Split copy of command info string
 140    */
 141   info = strdup(info);
 142   if (info == 0)
 143     return ENOBUFS;
 144   xivec = strsplit(info, ' ', '\'');
 145
 146   /*
 147    * Put stdout to stderr
 148    */
 149   (void) fclose(stdout);
 150   if (!logfp)
 151     logfp = stderr;             /* initialize before possible first use */
 152   (void) dup(fileno(logfp));
 153   if (fileno(logfp) != fileno(stderr)) {
 154     (void) fclose(stderr);
 155     (void) dup(fileno(logfp));
 156   }
 157
 158   /*
 159    * Try the exec
 160    */
 161   if (amuDebug(D_FULL)) {
 162     char **cp = xivec;
 163     plog(XLOG_DEBUG, "executing (un)mount command...");
 164     while (*cp) {
 165       plog(XLOG_DEBUG, "arg[%ld] = '%s'", (long) (cp - xivec), *cp);
 166       cp++;
 167     }
 168   }
 169
 170   if (xivec[0] == 0 || xivec[1] == 0) {
 171     errno = EINVAL;
 172     plog(XLOG_USER, "1st/2nd args missing to (un)mount program");
 173   } else {
 174     (void) execv(xivec[0], xivec + 1);
 175   }
 176
 177   /*
 178    * Save error number
 179    */
 180   error = errno;
 181   plog(XLOG_ERROR, "exec failed: %m");
 182
 183   /*
 184    * Free allocate memory
 185    */
 186   XFREE(info);
 187   XFREE(xivec);
 188
 189   /*
 190    * Return error
 191    */
 192   return error;
 193 }
 194
 195
 196 static int
 197 amfs_program_mount(am_node *am, mntfs *mf)
 198 {
 199   return amfs_program_exec(mf->mf_fo->opt_mount);
 200 }
 201
 202
 203 static int
 204 amfs_program_umount(am_node *am, mntfs *mf)
 205 {
 206   return amfs_program_exec((char *) mf->mf_private);
 207 }