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
|
/*
Unix SMB/Netbios implementation.
Version 2.0
a WINS nsswitch module
Copyright (C) Andrew Tridgell 1999
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define NO_SYSLOG
#include "includes.h"
#include <nss.h>
extern int DEBUGLEVEL;
#ifndef INADDRSZ
#define INADDRSZ 4
#endif
/* Use our own create socket code so we don't recurse.... */
static int wins_lookup_open_socket_in(void)
{
struct sockaddr_in sock;
int val=1;
int res;
memset((char *)&sock,'\0',sizeof(sock));
#ifdef HAVE_SOCK_SIN_LEN
sock.sin_len = sizeof(sock);
#endif
sock.sin_port = 0;
sock.sin_family = AF_INET;
sock.sin_addr.s_addr = interpret_addr("0.0.0.0");
res = socket(AF_INET, SOCK_DGRAM, 0);
if (res == -1)
return -1;
setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val));
#ifdef SO_REUSEPORT
setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val));
#endif /* SO_REUSEPORT */
/* now we've got a socket - we need to bind it */
if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) < 0)
return(-1);
return res;
}
struct in_addr *lookup_backend(const char *name, int *count)
{
int fd;
static int initialised;
struct in_addr *ret;
struct in_addr p;
int j;
if (!initialised) {
initialised = 1;
DEBUGLEVEL = 0;
TimeInit();
setup_logging("nss_wins",True);
charset_initialise();
lp_load(CONFIGFILE,True,False,False);
load_interfaces();
}
*count = 0;
fd = wins_lookup_open_socket_in();
if (fd == -1)
return NULL;
set_socket_options(fd,"SO_BROADCAST");
/* The next four lines commented out by JHT
and replaced with the four lines following */
/* if( !zero_ip( wins_ip ) ) {
* ret = name_query( fd, name, 0x20, False, True, wins_src_ip(), count );
* goto out;
* }
*/
p = wins_srv_ip();
if( !zero_ip(p) ) {
ret = name_query(fd,name,0x20,False,True, p, count);
goto out;
}
if (lp_wins_support()) {
/* we are our own WINS server */
ret = name_query(fd,name,0x20,False,True, *interpret_addr2("127.0.0.1"), count);
goto out;
}
/* uggh, we have to broadcast to each interface in turn */
for (j=iface_count() - 1;
j >= 0;
j--) {
struct in_addr *bcast = iface_n_bcast(j);
ret = name_query(fd,name,0x20,True,True,*bcast,count);
if (ret) break;
}
out:
close(fd);
return ret;
}
/****************************************************************************
gethostbyname() - we ignore any domain portion of the name and only
handle names that are at most 15 characters long
**************************************************************************/
enum nss_status
_nss_wins_gethostbyname_r(const char *name, struct hostent *he,
char *buffer, size_t buflen, int *errnop,
int *h_errnop)
{
char **host_addresses;
struct in_addr *ip_list;
int i, count;
size_t namelen = strlen(name) + 1;
ip_list = lookup_backend(name, &count);
if (!ip_list) {
return NSS_STATUS_NOTFOUND;
}
if (buflen < namelen + (2*count+1)*INADDRSZ) {
/* no ENOMEM error type?! */
return NSS_STATUS_NOTFOUND;
}
host_addresses = (char **)buffer;
he->h_addr_list = host_addresses;
host_addresses[count] = NULL;
buffer += (count + 1) * INADDRSZ;
buflen += (count + 1) * INADDRSZ;
he->h_addrtype = AF_INET;
he->h_length = INADDRSZ;
for (i=0;i<count;i++) {
memcpy(buffer, &ip_list[i].s_addr, INADDRSZ);
*host_addresses = buffer;
buffer += INADDRSZ;
buflen -= INADDRSZ;
host_addresses++;
}
if (ip_list)
free(ip_list);
memcpy(buffer, name, namelen);
he->h_name = buffer;
return NSS_STATUS_SUCCESS;
}
|
