1 /* 2 * Copyright (c) 1999 Martin Blapp 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/syslog.h> 32 33 #include <rpc/rpc.h> 34 #include <rpcsvc/mount.h> 35 36 #include <err.h> 37 #include <errno.h> 38 #include <limits.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #include "mounttab.h" 45 46 struct mtablist *mtabhead; 47 48 static void badline(const char *field, const char *bad); 49 50 /* 51 * Add an entry to PATH_MOUNTTAB for each mounted NFS filesystem, 52 * so the client can notify the NFS server even after reboot. 53 */ 54 int 55 add_mtab(char *hostp, char *dirp) 56 { 57 FILE *mtabfile; 58 59 if ((mtabfile = fopen(PATH_MOUNTTAB, "a")) == NULL) 60 return (0); 61 else { 62 fprintf(mtabfile, "%ld\t%s\t%s\n", 63 (long)time(NULL), hostp, dirp); 64 fclose(mtabfile); 65 return (1); 66 } 67 } 68 69 /* 70 * Read mounttab line for line and return struct mtablist. 71 */ 72 int 73 read_mtab(void) 74 { 75 struct mtablist **mtabpp, *mtabp; 76 char *hostp, *dirp, *cp; 77 char str[STRSIZ]; 78 char *timep, *endp; 79 time_t actiontime; 80 u_long ultmp; 81 FILE *mtabfile; 82 83 if ((mtabfile = fopen(PATH_MOUNTTAB, "r")) == NULL) { 84 if (errno == ENOENT) 85 return (0); 86 else { 87 syslog(LOG_ERR, "can't open %s", PATH_MOUNTTAB); 88 return (0); 89 } 90 } 91 actiontime = 0; 92 mtabpp = &mtabhead; 93 while (fgets(str, STRSIZ, mtabfile) != NULL) { 94 cp = str; 95 errno = 0; 96 if (*cp == '#' || *cp == ' ' || *cp == '\n') 97 continue; 98 timep = strsep(&cp, " \t\n"); 99 if (timep == NULL || *timep == '\0') { 100 badline("time", timep); 101 continue; 102 } 103 hostp = strsep(&cp, " \t\n"); 104 if (hostp == NULL || *hostp == '\0') { 105 badline("host", hostp); 106 continue; 107 } 108 dirp = strsep(&cp, " \t\n"); 109 if (dirp == NULL || *dirp == '\0') { 110 badline("dir", dirp); 111 continue; 112 } 113 ultmp = strtoul(timep, &endp, 10); 114 if (ultmp == ULONG_MAX || *endp != '\0') { 115 badline("time", timep); 116 continue; 117 } 118 actiontime = ultmp; 119 if ((mtabp = malloc(sizeof (struct mtablist))) == NULL) { 120 syslog(LOG_ERR, "malloc"); 121 fclose(mtabfile); 122 return (0); 123 } 124 mtabp->mtab_time = actiontime; 125 memmove(mtabp->mtab_host, hostp, MNTNAMLEN); 126 mtabp->mtab_host[MNTNAMLEN - 1] = '\0'; 127 memmove(mtabp->mtab_dirp, dirp, MNTPATHLEN); 128 mtabp->mtab_dirp[MNTPATHLEN - 1] = '\0'; 129 mtabp->mtab_next = (struct mtablist *)NULL; 130 *mtabpp = mtabp; 131 mtabpp = &mtabp->mtab_next; 132 } 133 fclose(mtabfile); 134 return (1); 135 } 136 137 /* 138 * Rewrite PATH_MOUNTTAB from scratch and skip bad entries. 139 * Unlink PATH_MOUNTAB if no entry is left. 140 */ 141 int 142 write_mtab(int verbose) 143 { 144 struct mtablist *mtabp, *mp; 145 FILE *mtabfile; 146 int line; 147 148 if ((mtabfile = fopen(PATH_MOUNTTAB, "w")) == NULL) { 149 syslog(LOG_ERR, "can't write to %s", PATH_MOUNTTAB); 150 return (0); 151 } 152 line = 0; 153 for (mtabp = mtabhead; mtabp != NULL; mtabp = mtabp->mtab_next) { 154 if (mtabp->mtab_host[0] == '\0') 155 continue; 156 /* Skip if a later (hence more recent) entry is identical. */ 157 for (mp = mtabp->mtab_next; mp != NULL; mp = mp->mtab_next) 158 if (strcmp(mtabp->mtab_host, mp->mtab_host) == 0 && 159 strcmp(mtabp->mtab_dirp, mp->mtab_dirp) == 0) 160 break; 161 if (mp != NULL) 162 continue; 163 164 fprintf(mtabfile, "%ld\t%s\t%s\n", 165 (long)mtabp->mtab_time, mtabp->mtab_host, 166 mtabp->mtab_dirp); 167 if (verbose) 168 warnx("write mounttab entry %s:%s", 169 mtabp->mtab_host, mtabp->mtab_dirp); 170 line++; 171 } 172 fclose(mtabfile); 173 if (line == 0) { 174 if (unlink(PATH_MOUNTTAB) == -1) { 175 syslog(LOG_ERR, "can't remove %s", PATH_MOUNTTAB); 176 return (0); 177 } 178 } 179 return (1); 180 } 181 182 /* 183 * Mark the entries as clean where RPC calls have been done successfully. 184 */ 185 void 186 clean_mtab(char *hostp, char *dirp, int verbose) 187 { 188 struct mtablist *mtabp; 189 char *host; 190 191 /* Copy hostp in case it points to an entry that we are zeroing out. */ 192 host = strdup(hostp); 193 for (mtabp = mtabhead; mtabp != NULL; mtabp = mtabp->mtab_next) { 194 if (strcmp(mtabp->mtab_host, host) != 0) 195 continue; 196 if (dirp != NULL && strcmp(mtabp->mtab_dirp, dirp) != 0) 197 continue; 198 199 if (verbose) 200 warnx("delete mounttab entry%s %s:%s", 201 (dirp == NULL) ? " by host" : "", 202 mtabp->mtab_host, mtabp->mtab_dirp); 203 bzero(mtabp->mtab_host, MNTNAMLEN); 204 } 205 free(host); 206 } 207 208 /* 209 * Free struct mtablist mtab. 210 */ 211 void 212 free_mtab(void) 213 { 214 struct mtablist *mtabp; 215 216 while ((mtabp = mtabhead) != NULL) { 217 mtabhead = mtabhead->mtab_next; 218 free(mtabp); 219 } 220 } 221 222 /* 223 * Print bad lines to syslog. 224 */ 225 static void 226 badline(const char *field, const char *bad) 227 { 228 syslog(LOG_ERR, "bad mounttab %s field '%s'", field, 229 (bad == NULL) ? "<null>" : bad); 230 } 231