amfs_program.c revision 277879 
1/*
2 * Copyright (c) 1997-2006 Erez Zadok
3 * Copyright (c) 1989 Jan-Simon Pendry
4 * Copyright (c) 1989 Imperial College of Science, Technology & Medicine
5 * Copyright (c) 1989 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry at Imperial College, London.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgment:
21 *      This product includes software developed by the University of
22 *      California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 *    may be used to endorse or promote products derived from this software
25 *    without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 *
40 * File: am-utils/amd/amfs_program.c
41 *
42 */
43
44/*
45 * Program file system
46 */
47
48#ifdef HAVE_CONFIG_H
49# include <config.h>
50#endif /* HAVE_CONFIG_H */
51#include <am_defs.h>
52#include <amd.h>
53
54/* forward definitions */
55static char *amfs_program_match(am_opts *fo);
56static int amfs_program_mount(am_node *am, mntfs *mf);
57static int amfs_program_umount(am_node *am, mntfs *mf);
58static int amfs_program_init(mntfs *mf);
59
60/*
61 * Ops structure
62 */
63am_ops amfs_program_ops =
64{
65  "program",
66  amfs_program_match,
67  amfs_program_init,
68  amfs_program_mount,
69  amfs_program_umount,
70  amfs_error_lookup_child,
71  amfs_error_mount_child,
72  amfs_error_readdir,
73  0,				/* amfs_program_readlink */
74  0,				/* amfs_program_mounted */
75  0,				/* amfs_program_umounted */
76  amfs_generic_find_srvr,
77  0,				/* amfs_program_get_wchan */
78  FS_MKMNT | FS_BACKGROUND | FS_AMQINFO,	/* nfs_fs_flags */
79#ifdef HAVE_FS_AUTOFS
80  AUTOFS_PROGRAM_FS_FLAGS,
81#endif /* HAVE_FS_AUTOFS */
82};
83
84
85/*
86 * Execute needs a mount and unmount command.
87 */
88static char *
89amfs_program_match(am_opts *fo)
90{
91  char *prog;
92
93  if (fo->opt_unmount && fo->opt_umount) {
94    plog(XLOG_ERROR, "program: cannot specify both unmount and umount options");
95    return 0;
96  }
97  if (!fo->opt_mount) {
98    plog(XLOG_ERROR, "program: must specify mount command");
99    return 0;
100  }
101  if (!fo->opt_unmount && !fo->opt_umount) {
102    fo->opt_unmount = str3cat(NULL, UNMOUNT_PROGRAM, " umount ", fo->opt_fs);
103    plog(XLOG_INFO, "program: un/umount not specified; using default \"%s\"",
104	 fo->opt_unmount);
105  }
106  prog = strchr(fo->opt_mount, ' ');
107
108  return strdup(prog ? prog + 1 : fo->opt_mount);
109}
110
111
112static int
113amfs_program_init(mntfs *mf)
114{
115  /* check if already saved value */
116  if (mf->mf_private != NULL)
117    return 0;
118
119  /* save unmount (or umount) command */
120  if (mf->mf_fo->opt_unmount != NULL)
121    mf->mf_private = (opaque_t) strdup(mf->mf_fo->opt_unmount);
122  else
123    mf->mf_private = (opaque_t) strdup(mf->mf_fo->opt_umount);
124  mf->mf_prfree = (void (*)(opaque_t)) free;
125
126  return 0;
127}
128
129
130static int
131amfs_program_exec(char *info)
132{
133  char **xivec;
134  int error;
135
136  /*
137   * Split copy of command info string
138   */
139  info = strdup(info);
140  if (info == 0)
141    return ENOBUFS;
142  xivec = strsplit(info, ' ', '\'');
143
144  /*
145   * Put stdout to stderr
146   */
147  (void) fclose(stdout);
148  if (!logfp)
149    logfp = stderr;		/* initialize before possible first use */
150    if (dup(fileno(logfp)) == -1)
151      return errno;
152  if (fileno(logfp) != fileno(stderr)) {
153    (void) fclose(stderr);
154    if (dup(fileno(logfp)) == -1)
155      return errno;
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
196static int
197amfs_program_mount(am_node *am, mntfs *mf)
198{
199  return amfs_program_exec(mf->mf_fo->opt_mount);
200}
201
202
203static int
204amfs_program_umount(am_node *am, mntfs *mf)
205{
206  return amfs_program_exec((char *) mf->mf_private);
207}
208