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