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 * $FreeBSD: src/usr.sbin/rpc.umntall/mounttab.c,v 1.2.2.1 2001/12/13 01:27:20 iedowse Exp $ 27 * $DragonFly: src/usr.sbin/rpc.umntall/mounttab.c,v 1.4 2008/11/12 21:44:59 swildner Exp $ 28 */ 29 30 #include <sys/syslog.h> 31 32 #include <rpc/rpc.h> 33 #include <nfs/rpcv2.h> 34 35 #include <err.h> 36 #include <errno.h> 37 #include <limits.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #include "mounttab.h" 44 45 struct mtablist *mtabhead; 46 47 static void badline(const char *field, const char *bad); 48 49 /* 50 * Add an entry to PATH_MOUNTTAB for each mounted NFS filesystem, 51 * so the client can notify the NFS server even after reboot. 52 */ 53 int 54 add_mtab(char *hostp, char *dirp) { 55 FILE *mtabfile; 56 57 if ((mtabfile = fopen(PATH_MOUNTTAB, "a")) == NULL) 58 return (0); 59 else { 60 fprintf(mtabfile, "%ld\t%s\t%s\n", 61 (long)time(NULL), hostp, dirp); 62 fclose(mtabfile); 63 return (1); 64 } 65 } 66 67 /* 68 * Read mounttab line for line and return struct mtablist. 69 */ 70 int 71 read_mtab(void) { 72 struct mtablist **mtabpp, *mtabp; 73 char *hostp, *dirp, *cp; 74 char str[STRSIZ]; 75 char *timep, *endp; 76 time_t mnt_time; 77 u_long ultmp; 78 FILE *mtabfile; 79 80 if ((mtabfile = fopen(PATH_MOUNTTAB, "r")) == NULL) { 81 if (errno == ENOENT) 82 return (0); 83 else { 84 syslog(LOG_ERR, "can't open %s", PATH_MOUNTTAB); 85 return (0); 86 } 87 } 88 mnt_time = 0; 89 mtabpp = &mtabhead; 90 while (fgets(str, STRSIZ, mtabfile) != NULL) { 91 cp = str; 92 errno = 0; 93 if (*cp == '#' || *cp == ' ' || *cp == '\n') 94 continue; 95 timep = strsep(&cp, " \t\n"); 96 if (timep == NULL || *timep == '\0') { 97 badline("time", timep); 98 continue; 99 } 100 hostp = strsep(&cp, " \t\n"); 101 if (hostp == NULL || *hostp == '\0') { 102 badline("host", hostp); 103 continue; 104 } 105 dirp = strsep(&cp, " \t\n"); 106 if (dirp == NULL || *dirp == '\0') { 107 badline("dir", dirp); 108 continue; 109 } 110 ultmp = strtoul(timep, &endp, 10); 111 if (ultmp == ULONG_MAX || *endp != '\0') { 112 badline("time", timep); 113 continue; 114 } 115 mnt_time = ultmp; 116 if ((mtabp = malloc(sizeof (struct mtablist))) == NULL) { 117 syslog(LOG_ERR, "malloc"); 118 fclose(mtabfile); 119 return (0); 120 } 121 mtabp->mtab_time = mnt_time; 122 memmove(mtabp->mtab_host, hostp, RPCMNT_NAMELEN); 123 mtabp->mtab_host[RPCMNT_NAMELEN - 1] = '\0'; 124 memmove(mtabp->mtab_dirp, dirp, RPCMNT_PATHLEN); 125 mtabp->mtab_dirp[RPCMNT_PATHLEN - 1] = '\0'; 126 mtabp->mtab_next = NULL; 127 *mtabpp = mtabp; 128 mtabpp = &mtabp->mtab_next; 129 } 130 fclose(mtabfile); 131 return (1); 132 } 133 134 /* 135 * Rewrite PATH_MOUNTTAB from scratch and skip bad entries. 136 * Unlink PATH_MOUNTAB if no entry is left. 137 */ 138 int 139 write_mtab(int verbose) { 140 struct mtablist *mtabp, *mp; 141 FILE *mtabfile; 142 int line; 143 144 if ((mtabfile = fopen(PATH_MOUNTTAB, "w")) == NULL) { 145 syslog(LOG_ERR, "can't write to %s", PATH_MOUNTTAB); 146 return (0); 147 } 148 line = 0; 149 for (mtabp = mtabhead; mtabp != NULL; mtabp = mtabp->mtab_next) { 150 if (mtabp->mtab_host[0] == '\0') 151 continue; 152 /* Skip if a later (hence more recent) entry is identical. */ 153 for (mp = mtabp->mtab_next; mp != NULL; mp = mp->mtab_next) 154 if (strcmp(mtabp->mtab_host, mp->mtab_host) == 0 && 155 strcmp(mtabp->mtab_dirp, mp->mtab_dirp) == 0) 156 break; 157 if (mp != NULL) 158 continue; 159 160 fprintf(mtabfile, "%ld\t%s\t%s\n", 161 (long)mtabp->mtab_time, mtabp->mtab_host, 162 mtabp->mtab_dirp); 163 if (verbose) 164 warnx("write mounttab entry %s:%s", 165 mtabp->mtab_host, mtabp->mtab_dirp); 166 line++; 167 } 168 fclose(mtabfile); 169 if (line == 0) { 170 if (unlink(PATH_MOUNTTAB) == -1) { 171 syslog(LOG_ERR, "can't remove %s", PATH_MOUNTTAB); 172 return (0); 173 } 174 } 175 return (1); 176 } 177 178 /* 179 * Mark the entries as clean where RPC calls have been done successfully. 180 */ 181 void 182 clean_mtab(char *hostp, char *dirp, int verbose) { 183 struct mtablist *mtabp; 184 char *host; 185 186 /* Copy hostp in case it points to an entry that we are zeroing out. */ 187 host = strdup(hostp); 188 for (mtabp = mtabhead; mtabp != NULL; mtabp = mtabp->mtab_next) { 189 if (strcmp(mtabp->mtab_host, host) != 0) 190 continue; 191 if (dirp != NULL && strcmp(mtabp->mtab_dirp, dirp) != 0) 192 continue; 193 194 if (verbose) 195 warnx("delete mounttab entry%s %s:%s", 196 (dirp == NULL) ? " by host" : "", 197 mtabp->mtab_host, mtabp->mtab_dirp); 198 bzero(mtabp->mtab_host, RPCMNT_NAMELEN); 199 } 200 free(host); 201 } 202 203 /* 204 * Free struct mtablist mtab. 205 */ 206 void 207 free_mtab(void) { 208 struct mtablist *mtabp; 209 210 while ((mtabp = mtabhead) != NULL) { 211 mtabhead = mtabhead->mtab_next; 212 free(mtabp); 213 } 214 } 215 216 /* 217 * Print bad lines to syslog. 218 */ 219 static void 220 badline(const char *field, const char *bad) { 221 syslog(LOG_ERR, "bad mounttab %s field '%s'", field, 222 (bad == NULL) ? "<null>" : bad); 223 } 224