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
|
/* Copyright (C) 1997-2005 Luke Howard.
This file is part of the nss_ldap library.
Contributed by Luke Howard, <lukeh@padl.com>, 1997.
(The author maintains a non-exclusive licence to distribute this file
under their own conditions.)
The nss_ldap library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The nss_ldap library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the nss_ldap library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/*
* Support DNS SRV records. I look up the SRV record for
* _ldap._tcp.gnu.org.
* and build the DN DC=gnu,DC=org.
* Thanks to Assar & co for resolve.[ch].
*/
static char rcsId[] =
"$Id: dnsconfig.c,v 2.45 2007/10/01 14:25:30 lukeh Exp $";
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/param.h>
#include <netdb.h>
#include <syslog.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <string.h>
#ifdef HAVE_LBER_H
#include <lber.h>
#endif
#ifdef HAVE_LDAP_H
#include <ldap.h>
#endif
#ifndef HAVE_SNPRINTF
#include "snprintf.h"
#endif
#include "ldap-nss.h"
#include "util.h"
#include "resolve.h"
#include "dnsconfig.h"
/* map gnu.org into DC=gnu,DC=org */
NSS_STATUS
_nss_ldap_getdnsdn (char *src_domain,
char **rval, char **buffer, size_t * buflen)
{
char *p;
int len = 0;
#ifdef HAVE_STRTOK_R
char *st = NULL;
#endif
char *bptr;
char *domain, *domain_copy;
/* we need to take a copy of domain, because strtok() modifies
* it in place. Bad.
*/
domain_copy = strdup (src_domain);
if (domain_copy == NULL)
{
return NSS_TRYAGAIN;
}
domain = domain_copy;
bptr = *rval = *buffer;
**rval = '\0';
#ifndef HAVE_STRTOK_R
while ((p = strtok (domain, ".")))
#else
while ((p = strtok_r (domain, ".", &st)))
#endif
{
len = strlen (p);
if (*buflen < (size_t) (len + DC_ATTR_AVA_LEN + 1 /* D C = [,|\0] */ ))
{
free (domain_copy);
return NSS_TRYAGAIN;
}
if (domain == NULL)
{
strcpy (bptr, ",");
bptr++;
}
else
{
domain = NULL;
}
strcpy (bptr, DC_ATTR_AVA);
bptr += DC_ATTR_AVA_LEN;
strcpy (bptr, p);
bptr += len; /* don't include comma */
*buffer += len + DC_ATTR_AVA_LEN + 1;
*buflen -= len + DC_ATTR_AVA_LEN + 1;
}
if (bptr != NULL)
{
(*rval)[bptr - *rval] = '\0';
}
free (domain_copy);
return NSS_SUCCESS;
}
NSS_STATUS
_nss_ldap_mergeconfigfromdns (ldap_config_t * result,
char **buffer, size_t *buflen)
{
NSS_STATUS stat = NSS_SUCCESS;
struct dns_reply *r;
struct resource_record *rr;
char domain[MAXHOSTNAMELEN + 1];
char *pDomain;
char uribuf[NSS_BUFSIZ];
if ((_res.options & RES_INIT) == 0 && res_init () == -1)
{
return NSS_UNAVAIL;
}
snprintf (domain, sizeof (domain), "_ldap._tcp.%s.",
result->ldc_srv_domain ? result->ldc_srv_domain : _res.defdname);
pDomain = domain;
r = dns_lookup (pDomain, "srv");
if (r == NULL)
{
return NSS_NOTFOUND;
}
/* XXX sort by priority */
for (rr = r->head; rr != NULL; rr = rr->next)
{
if (rr->type == T_SRV)
{
snprintf (uribuf, sizeof(uribuf), "ldap%s://%s:%d",
(rr->u.srv->port == LDAPS_PORT) ? "s" : "",
rr->u.srv->target,
rr->u.srv->port);
stat = _nss_ldap_add_uri (result, uribuf, buffer, buflen);
if (stat != NSS_SUCCESS)
{
break;
}
}
}
dns_free_data (r);
stat = NSS_SUCCESS;
if (result->ldc_base == NULL)
{
stat = _nss_ldap_getdnsdn (_res.defdname, &result->ldc_base,
buffer, buflen);
}
return stat;
}
|
