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
|
/*
* support/export/xtab.c
*
* Interface to the xtab file.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#include "config.h"
#include <sys/fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "xmalloc.h"
#include "nfslib.h"
#include "exportfs.h"
#include "xio.h"
#include "xlog.h"
static int
xtab_read(char *xtab, int is_export)
{
/* is_export == 0 => reading /proc/fs/nfs/exports - we know these things are exported to kernel
* is_export == 1 => reading /var/lib/nfs/etab - these things are allowed to be exported
* is_export == 2 => reading /var/lib/nfs/xtab - these things might be known to kernel
*/
struct exportent *xp;
nfs_export *exp;
int lockid;
if ((lockid = xflock(xtab, "r")) < 0)
return 0;
setexportent(xtab, "r");
while ((xp = getexportent(is_export==0)) != NULL) {
if (!(exp = export_lookup(xp->e_hostname, xp->e_path, is_export != 1)) &&
!(exp = export_create(xp, is_export!=1))) {
continue;
}
switch (is_export) {
case 0:
exp->m_exported = 1;
break;
case 1:
exp->m_xtabent = 1;
exp->m_mayexport = 1;
break;
case 2:
exp->m_exported = -1;/* may be exported */
break;
}
}
endexportent();
xfunlock(lockid);
return 0;
}
int
xtab_mount_read(void)
{
int fd;
if ((fd=open(_PATH_PROC_EXPORTS, O_RDONLY))>=0) {
close(fd);
return xtab_read(_PATH_PROC_EXPORTS, 0);
} else
return xtab_read(_PATH_XTAB, 2);
}
int
xtab_export_read(void)
{
return xtab_read(_PATH_ETAB, 1);
}
static int
xtab_write(char *xtab, char *xtabtmp, int is_export)
{
struct exportent xe;
nfs_export *exp;
int lockid, i;
if ((lockid = xflock(xtab, "w")) < 0) {
xlog(L_ERROR, "can't lock %s for writing", xtab);
return 0;
}
setexportent(xtabtmp, "w");
for (i = 0; i < MCL_MAXTYPES; i++) {
for (exp = exportlist[i]; exp; exp = exp->m_next) {
if (is_export && !exp->m_xtabent)
continue;
if (!is_export && ! exp->m_exported)
continue;
/* write out the export entry using the FQDN */
xe = exp->m_export;
strncpy(xe.e_hostname,
exp->m_client->m_hostname,
sizeof (xe.e_hostname) - 1);
xe.e_hostname[sizeof (xe.e_hostname) - 1] = '\0';
putexportent(&xe);
}
}
endexportent();
rename(xtabtmp, xtab);
xfunlock(lockid);
return 1;
}
int
xtab_export_write()
{
return xtab_write(_PATH_ETAB, _PATH_ETABTMP, 1);
}
int
xtab_mount_write()
{
return xtab_write(_PATH_XTAB, _PATH_XTABTMP, 0);
}
void
xtab_append(nfs_export *exp)
{
struct exportent xe;
int lockid;
if ((lockid = xflock(_PATH_XTAB, "w")) < 0)
return;
setexportent(_PATH_XTAB, "a");
xe = exp->m_export;
strncpy(xe.e_hostname, exp->m_client->m_hostname,
sizeof (xe.e_hostname) - 1);
xe.e_hostname[sizeof (xe.e_hostname) - 1] = '\0';
putexportent(&xe);
endexportent();
xfunlock(lockid);
exp->m_xtabent = 1;
}
|
