mounttab.c revision 53494 
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#ifndef lint
29static const char rcsid[] =
30  "$FreeBSD: head/usr.sbin/rpc.umntall/mounttab.c 53494 1999-11-21 08:06:00Z dillon $";
31#endif /* not lint */
32
33#include <sys/syslog.h>
34
35#include <rpc/rpc.h>
36#include <nfs/rpcv2.h>
37
38#include <err.h>
39#include <errno.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43#include <unistd.h>
44
45#include "mounttab.h"
46
47int verbose;
48struct mtablist *mtabhead;
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 */
54int
55add_mtab(char *hostp, char *dirp) {
56	FILE *mtabfile;
57	time_t *now;
58
59	now = NULL;
60	if ((mtabfile = fopen(PATH_MOUNTTAB, "a")) == NULL)
61		return (0);
62	else {
63		fprintf(mtabfile, "%ld\t%s\t%s\n", time(now), hostp, dirp);
64		fclose(mtabfile);
65		return (1);
66	}
67}
68
69/*
70 * Read mounttab line for line and return struct mtablist.
71 */
72int
73read_mtab(struct mtablist *mtabp) {
74	struct mtablist **mtabpp;
75	char *hostp, *dirp, *cp;
76	char str[STRSIZ];
77	char *timep;
78	time_t time;
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 == ' ' || *timep == '\n') {
98			badline(timep);
99			continue;
100		}
101		hostp = strsep(&cp, " \t\n");
102		if (hostp == NULL || *hostp == ' ' || *hostp == '\n') {
103			badline(hostp);
104			continue;
105		}
106		dirp = strsep(&cp, " \t\n");
107		if (dirp == NULL || *dirp == ' ' || *dirp == '\n') {
108			badline(dirp);
109			continue;
110		}
111		time = strtoul(timep, (char **)NULL, 10);
112		if (errno == ERANGE) {
113			badline(timep);
114			continue;
115		}
116		if ((mtabp = malloc(sizeof (struct mtablist))) == NULL) {
117			syslog(LOG_ERR, "malloc");
118			fclose(mtabfile);
119			return (0);
120		}
121		mtabp->mtab_time = 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 = (struct mtablist *)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 */
138int
139write_mtab() {
140	struct mtablist *mtabp;
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 != NULL &&
151		    strlen(mtabp->mtab_host) > 0) {
152			fprintf(mtabfile, "%ld\t%s\t%s\n", mtabp->mtab_time,
153			    mtabp->mtab_host, mtabp->mtab_dirp);
154			line++;
155		}
156	}
157	fclose(mtabfile);
158	if (line == 0) {
159		if (unlink(PATH_MOUNTTAB) == -1) {
160			syslog(LOG_ERR, "can't remove %s", PATH_MOUNTTAB);
161			return (0);
162		}
163	}
164	return (1);
165}
166
167/*
168 * Mark the entries as clean where RPC calls have been done successfully.
169 */
170void
171clean_mtab(char *hostp, char *dirp) {
172	struct mtablist *mtabp;
173	char *host;
174
175	host = strdup(hostp);
176	for (mtabp = mtabhead; mtabp != NULL; mtabp = mtabp->mtab_next) {
177		if (mtabp->mtab_host != NULL &&
178		    strcmp(mtabp->mtab_host, host) == 0) {
179			if (dirp == NULL) {
180				if (verbose) {
181					warnx("entries deleted for "
182					    "host %s", host);
183				}
184				bzero(mtabp->mtab_host, RPCMNT_NAMELEN);
185			} else {
186				if (strcmp(mtabp->mtab_dirp, dirp) == 0) {
187					if (verbose) {
188						warnx("entry deleted for "
189						    "%s:%s", host, dirp);
190					}
191					bzero(mtabp->mtab_host, RPCMNT_NAMELEN);
192				}
193			}
194		}
195	}
196	free(host);
197}
198
199/*
200 * Free struct mtablist mtab.
201 */
202void
203free_mtab() {
204	struct mtablist *mtabp;
205	struct mtablist *mtab_next;
206
207	for (mtabp = mtabhead; mtabp != NULL; mtabp = mtab_next) {
208		mtab_next = mtabp->mtab_next;
209		free(mtabp);
210		mtabp = mtab_next;
211	}
212}
213
214/*
215 * Print bad lines to syslog.
216 */
217void
218badline(char *bad) {
219
220	syslog(LOG_ERR, "skipped bad line in mounttab with entry %s", bad);
221}
222