1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
|
/*
* utils/mountd/rmtab.c
*
* Manage the rmtab file for mountd.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "misc.h"
#include "exportfs.h"
#include "xio.h"
#include "mountd.h"
#include "ha-callout.h"
#include <limits.h> /* PATH_MAX */
#include <errno.h>
extern int reverse_resolve;
/* If new path is a link do not destroy it but place the
* file where the link points.
*/
static int
slink_safe_rename(const char * oldpath, const char * newpath)
{
int r;
struct stat s;
char slink_path[PATH_MAX];
const char *real_newpath = newpath;
if ((lstat(newpath, &s) == 0) && S_ISLNK(s.st_mode)) {
/* New path is a symbolic link, do not destroy but follow */
if ((r = readlink(newpath, slink_path, PATH_MAX - 1)) == -1)
return -1;
slink_path[r] = '\0';
real_newpath = slink_path;
}
return rename(oldpath, real_newpath);
}
void
mountlist_add(char *host, const char *path)
{
struct rmtabent xe;
struct rmtabent *rep;
int lockid;
long pos;
if ((lockid = xflock(_PATH_RMTABLCK, "a")) < 0)
return;
setrmtabent("r+");
while ((rep = getrmtabent(1, &pos)) != NULL) {
if (strcmp (rep->r_client,
host) == 0
&& strcmp(rep->r_path, path) == 0) {
rep->r_count++;
/* PRC: do the HA callout: */
ha_callout("mount", rep->r_client, rep->r_path, rep->r_count);
putrmtabent(rep, &pos);
endrmtabent();
xfunlock(lockid);
return;
}
}
endrmtabent();
strncpy(xe.r_client, host,
sizeof (xe.r_client) - 1);
xe.r_client [sizeof (xe.r_client) - 1] = '\0';
strncpy(xe.r_path, path, sizeof (xe.r_path) - 1);
xe.r_path [sizeof (xe.r_path) - 1] = '\0';
xe.r_count = 1;
if (setrmtabent("a")) {
/* PRC: do the HA callout: */
ha_callout("mount", xe.r_client, xe.r_path, xe.r_count);
putrmtabent(&xe, NULL);
endrmtabent();
}
xfunlock(lockid);
}
void
mountlist_del(char *hname, const char *path)
{
struct rmtabent *rep;
FILE *fp;
int lockid;
int match;
if ((lockid = xflock(_PATH_RMTABLCK, "w")) < 0)
return;
if (!setrmtabent("r")) {
xfunlock(lockid);
return;
}
if (!(fp = fsetrmtabent(_PATH_RMTABTMP, "w"))) {
endrmtabent();
xfunlock(lockid);
return;
}
while ((rep = getrmtabent(1, NULL)) != NULL) {
match = !strcmp (rep->r_client, hname)
&& !strcmp(rep->r_path, path);
if (match) {
rep->r_count--;
/* PRC: do the HA callout: */
ha_callout("unmount", rep->r_client, rep->r_path, rep->r_count);
}
if (!match || rep->r_count)
fputrmtabent(fp, rep, NULL);
}
if (slink_safe_rename(_PATH_RMTABTMP, _PATH_RMTAB) < 0) {
xlog(L_ERROR, "couldn't rename %s to %s",
_PATH_RMTABTMP, _PATH_RMTAB);
}
endrmtabent(); /* close & unlink */
fendrmtabent(fp);
xfunlock(lockid);
}
void
mountlist_del_all(const struct sockaddr *sap)
{
char *hostname;
struct rmtabent *rep;
FILE *fp;
int lockid;
if ((lockid = xflock(_PATH_RMTABLCK, "w")) < 0)
return;
hostname = host_canonname(sap);
if (hostname == NULL) {
char buf[INET6_ADDRSTRLEN];
xlog(L_ERROR, "can't get hostname of %s",
host_ntop(sap, buf, sizeof(buf)));
goto out_unlock;
}
if (!setrmtabent("r"))
goto out_free;
if (!(fp = fsetrmtabent(_PATH_RMTABTMP, "w")))
goto out_close;
while ((rep = getrmtabent(1, NULL)) != NULL) {
if (strcmp(rep->r_client, hostname) == 0 &&
auth_authenticate("umountall", sap, rep->r_path) != NULL)
continue;
fputrmtabent(fp, rep, NULL);
}
if (slink_safe_rename(_PATH_RMTABTMP, _PATH_RMTAB) < 0) {
xlog(L_ERROR, "couldn't rename %s to %s",
_PATH_RMTABTMP, _PATH_RMTAB);
}
fendrmtabent(fp);
out_close:
endrmtabent(); /* close & unlink */
out_free:
free(hostname);
out_unlock:
xfunlock(lockid);
}
static void
mountlist_freeall(mountlist list)
{
while (list != NULL) {
mountlist m = list;
list = m->ml_next;
free(m->ml_hostname);
free(m->ml_directory);
free(m);
}
}
mountlist
mountlist_list(void)
{
static mountlist mlist = NULL;
static time_t last_mtime = 0;
mountlist m;
struct rmtabent *rep;
struct stat stb;
int lockid;
if ((lockid = xflock(_PATH_RMTABLCK, "r")) < 0)
return NULL;
if (stat(_PATH_RMTAB, &stb) < 0) {
xlog(L_ERROR, "can't stat %s: %s",
_PATH_RMTAB, strerror(errno));
xfunlock(lockid);
return NULL;
}
if (stb.st_mtime != last_mtime) {
mountlist_freeall(mlist);
mlist = NULL;
last_mtime = stb.st_mtime;
setrmtabent("r");
while ((rep = getrmtabent(1, NULL)) != NULL) {
m = calloc(1, sizeof(*m));
if (m == NULL) {
mountlist_freeall(mlist);
mlist = NULL;
xlog(L_ERROR, "%s: memory allocation failed",
__func__);
break;
}
if (reverse_resolve) {
struct addrinfo *ai;
ai = host_pton(rep->r_client);
if (ai != NULL) {
m->ml_hostname = host_canonname(ai->ai_addr);
freeaddrinfo(ai);
}
}
if (m->ml_hostname == NULL)
m->ml_hostname = strdup(rep->r_client);
m->ml_directory = strdup(rep->r_path);
if (m->ml_hostname == NULL || m->ml_directory == NULL) {
mountlist_freeall(mlist);
mlist = NULL;
xlog(L_ERROR, "%s: memory allocation failed",
__func__);
break;
}
m->ml_next = mlist;
mlist = m;
}
endrmtabent();
}
xfunlock(lockid);
return mlist;
}
|
