diff options
Diffstat (limited to 'conf/checkmount/checkmount_default.c')
-rw-r--r-- | conf/checkmount/checkmount_default.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/conf/checkmount/checkmount_default.c b/conf/checkmount/checkmount_default.c new file mode 100644 index 000000000000..18d8fe335fec --- /dev/null +++ b/conf/checkmount/checkmount_default.c @@ -0,0 +1,105 @@ +/* + * Copyright (c) 1997-2014 Erez Zadok + * Copyright (c) 1990 Jan-Simon Pendry + * Copyright (c) 1990 Imperial College of Science, Technology & Medicine + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Jan-Simon Pendry at Imperial College, London. + * + * 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. 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. + * + * + * File: am-utils/conf/checkmount/checkmount_default.c + * + */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif /* HAVE_CONFIG_H */ +#include <am_defs.h> + +#ifndef _PATH_MTAB +#define _PATH_MTAB "/etc/mtab" +#endif /* not _PATH_MTAB */ + +extern int is_same_host(char *name1, char *name2, struct in_addr addr2); + + +int +fixmount_check_mount(char *host, struct in_addr hostaddr, char *path) +{ + FILE *mtab; + mntent_t *ment; + int found = 0; + + /* scan mtab for path */ + if (!(mtab = setmntent(_PATH_MTAB, "r"))) { + perror(_PATH_MTAB); + exit(1); + } + + /* + * setmntent() doesn't do locking in read-only mode. Too bad -- it seems to + * rely on mount() and friends to do atomic updates by renaming the file. + * Well, our patched amd rewrites mtab in place to avoid NFS lossage, so + * better do the locking ourselves. + */ +#ifdef HAVE_FLOCK + if (flock(fileno(mtab), LOCK_SH) < 0) { +#else /* not HAVE_FLOCK */ + if (lockf(fileno(mtab), F_LOCK, 0) < 0) { +#endif /* not HAVE_FLOCK */ + perror(_PATH_MTAB); + exit(1); + } + + while (!found && (ment = getmntent(mtab))) { + char *colon; + + if ((colon = strchr(ment->mnt_fsname, ':'))) { + *colon = '\0'; + if ((STREQ(colon + 1, path) || + STREQ(ment->mnt_dir, path)) && + is_same_host(ment->mnt_fsname, host, hostaddr)) + found = 1; + } + } + + (void) endmntent(mtab); + + if (!found) { + char *swap; + + /* swap files never show up in mtab, only root fs */ + if ((swap = strstr(path, "swap"))) { + strncpy(swap, "root", 4); /* this should NOT use xstrlcpy */ + found = fixmount_check_mount(host, hostaddr, path); + strncpy(swap, "swap", 4); /* this should NOT use xstrlcpy */ + } + } + return found; +} |