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 <nfs/rpcv2.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(char *field, 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 FILE *mtabfile; 57 58 if ((mtabfile = fopen(PATH_MOUNTTAB, "a")) == NULL) 59 return (0); 60 else { 61 fprintf(mtabfile, "%ld\t%s\t%s\n", 62 (long)time(NULL), hostp, dirp); 63 fclose(mtabfile); 64 return (1); 65 } 66 } 67 68 /* 69 * Read mounttab line for line and return struct mtablist. 70 */ 71 int 72 read_mtab() { 73 struct mtablist **mtabpp, *mtabp; 74 char *hostp, *dirp, *cp; 75 char str[STRSIZ]; 76 char *timep, *endp; 77 time_t time; 78 u_long ultmp; 79 FILE *mtabfile; 80 81 if ((mtabfile = fopen(PATH_MOUNTTAB, "r")) == NULL) { 82 if (errno == ENOENT) 83 return (0); 84 else { 85 syslog(LOG_ERR, "can't open %s", PATH_MOUNTTAB); 86 return (0); 87 } 88 } 89 time = 0; 90 mtabpp = &mtabhead; 91 while (fgets(str, STRSIZ, mtabfile) != NULL) { 92 cp = str; 93 errno = 0; 94 if (*cp == '#' || *cp == ' ' || *cp == '\n') 95 continue; 96 timep = strsep(&cp, " \t\n"); 97 if (timep == NULL || *timep == '\0') { 98 badline("time", timep); 99 continue; 100 } 101 hostp = strsep(&cp, " \t\n"); 102 if (hostp == NULL || *hostp == '\0') { 103 badline("host", hostp); 104 continue; 105 } 106 dirp = strsep(&cp, " \t\n"); 107 if (dirp == NULL || *dirp == '\0') { 108 badline("dir", dirp); 109 continue; 110 } 111 ultmp = strtoul(timep, &endp, 10); 112 if (ultmp == ULONG_MAX || *endp != '\0') { 113 badline("time", timep); 114 continue; 115 } 116 time = ultmp; 117 if ((mtabp = malloc(sizeof (struct mtablist))) == NULL) { 118 syslog(LOG_ERR, "malloc"); 119 fclose(mtabfile); 120 return (0); 121 } 122 mtabp->mtab_time = time; 123 memmove(mtabp->mtab_host, hostp, RPCMNT_NAMELEN); 124 mtabp->mtab_host[RPCMNT_NAMELEN - 1] = '\0'; 125 memmove(mtabp->mtab_dirp, dirp, RPCMNT_PATHLEN); 126 mtabp->mtab_dirp[RPCMNT_PATHLEN - 1] = '\0'; 127 mtabp->mtab_next = (struct mtablist *)NULL; 128 *mtabpp = mtabp; 129 mtabpp = &mtabp->mtab_next; 130 } 131 fclose(mtabfile); 132 return (1); 133 } 134 135 /* 136 * Rewrite PATH_MOUNTTAB from scratch and skip bad entries. 137 * Unlink PATH_MOUNTAB if no entry is left. 138 */ 139 int 140 write_mtab(int verbose) { 141 struct mtablist *mtabp, *mp; 142 FILE *mtabfile; 143 int line; 144 145 if ((mtabfile = fopen(PATH_MOUNTTAB, "w")) == NULL) { 146 syslog(LOG_ERR, "can't write to %s", PATH_MOUNTTAB); 147 return (0); 148 } 149 line = 0; 150 for (mtabp = mtabhead; mtabp != NULL; mtabp = mtabp->mtab_next) { 151 if (mtabp->mtab_host[0] == '\0') 152 continue; 153 /* Skip if a later (hence more recent) entry is identical. */ 154 for (mp = mtabp->mtab_next; mp != NULL; mp = mp->mtab_next) 155 if (strcmp(mtabp->mtab_host, mp->mtab_host) == 0 && 156 strcmp(mtabp->mtab_dirp, mp->mtab_dirp) == 0) 157 break; 158 if (mp != NULL) 159 continue; 160 161 fprintf(mtabfile, "%ld\t%s\t%s\n", 162 (long)mtabp->mtab_time, mtabp->mtab_host, 163 mtabp->mtab_dirp); 164 if (verbose) 165 warnx("write mounttab entry %s:%s", 166 mtabp->mtab_host, mtabp->mtab_dirp); 167 line++; 168 } 169 fclose(mtabfile); 170 if (line == 0) { 171 if (unlink(PATH_MOUNTTAB) == -1) { 172 syslog(LOG_ERR, "can't remove %s", PATH_MOUNTTAB); 173 return (0); 174 } 175 } 176 return (1); 177 } 178 179 /* 180 * Mark the entries as clean where RPC calls have been done successfully. 181 */ 182 void 183 clean_mtab(char *hostp, char *dirp, int verbose) { 184 struct mtablist *mtabp; 185 char *host; 186 187 /* Copy hostp in case it points to an entry that we are zeroing out. */ 188 host = strdup(hostp); 189 for (mtabp = mtabhead; mtabp != NULL; mtabp = mtabp->mtab_next) { 190 if (strcmp(mtabp->mtab_host, host) != 0) 191 continue; 192 if (dirp != NULL && strcmp(mtabp->mtab_dirp, dirp) != 0) 193 continue; 194 195 if (verbose) 196 warnx("delete mounttab entry%s %s:%s", 197 (dirp == NULL) ? " by host" : "", 198 mtabp->mtab_host, mtabp->mtab_dirp); 199 bzero(mtabp->mtab_host, RPCMNT_NAMELEN); 200 } 201 free(host); 202 } 203 204 /* 205 * Free struct mtablist mtab. 206 */ 207 void 208 free_mtab() { 209 struct mtablist *mtabp; 210 211 while ((mtabp = mtabhead) != NULL) { 212 mtabhead = mtabhead->mtab_next; 213 free(mtabp); 214 } 215 } 216 217 /* 218 * Print bad lines to syslog. 219 */ 220 static void 221 badline(char *field, char *bad) { 222 syslog(LOG_ERR, "bad mounttab %s field '%s'", field, 223 (bad == NULL) ? "<null>" : bad); 224 } 225