1 /* $NetBSD: checkmount_default.c,v 1.1.1.2 2009/03/20 20:26:50 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2009 Erez Zadok 5 * Copyright (c) 1990 Jan-Simon Pendry 6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine 7 * Copyright (c) 1990 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/conf/checkmount/checkmount_default.c 43 * 44 */ 45 46 #ifdef HAVE_CONFIG_H 47 # include <config.h> 48 #endif /* HAVE_CONFIG_H */ 49 #include <am_defs.h> 50 51 #ifndef _PATH_MTAB 52 #define _PATH_MTAB "/etc/mtab" 53 #endif /* not _PATH_MTAB */ 54 55 extern int is_same_host(char *name1, char *name2, struct in_addr addr2); 56 57 58 int 59 fixmount_check_mount(char *host, struct in_addr hostaddr, char *path) 60 { 61 FILE *mtab; 62 mntent_t *ment; 63 int found = 0; 64 65 /* scan mtab for path */ 66 if (!(mtab = setmntent(_PATH_MTAB, "r"))) { 67 perror(_PATH_MTAB); 68 exit(1); 69 } 70 71 /* 72 * setmntent() doesn't do locking in read-only mode. Too bad -- it seems to 73 * rely on mount() and friends to do atomic updates by renaming the file. 74 * Well, our patched amd rewrites mtab in place to avoid NFS lossage, so 75 * better do the locking ourselves. 76 */ 77 #ifdef HAVE_FLOCK 78 if (flock(fileno(mtab), LOCK_SH) < 0) { 79 #else /* not HAVE_FLOCK */ 80 if (lockf(fileno(mtab), F_LOCK, 0) < 0) { 81 #endif /* not HAVE_FLOCK */ 82 perror(_PATH_MTAB); 83 exit(1); 84 } 85 86 while (!found && (ment = getmntent(mtab))) { 87 char *colon; 88 89 if ((colon = strchr(ment->mnt_fsname, ':'))) { 90 *colon = '\0'; 91 if ((STREQ(colon + 1, path) || 92 STREQ(ment->mnt_dir, path)) && 93 is_same_host(ment->mnt_fsname, host, hostaddr)) 94 found = 1; 95 } 96 } 97 98 (void) endmntent(mtab); 99 100 if (!found) { 101 char *swap; 102 103 /* swap files never show up in mtab, only root fs */ 104 if ((swap = strstr(path, "swap"))) { 105 strncpy(swap, "root", 4); /* this should NOT use xstrlcpy */ 106 found = fixmount_check_mount(host, hostaddr, path); 107 strncpy(swap, "swap", 4); /* this should NOT use xstrlcpy */ 108 } 109 } 110 return found; 111 } 112