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
|
/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@uni-paderborn.de>, 1997.
The GNU C 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 GNU C 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 GNU C 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. */
#include <string.h>
#include <rpcsvc/nis.h>
#include "nis_xdr.h"
#include "nis_intern.h"
nis_result *
nis_lookup (const_nis_name name, const unsigned int flags)
{
nis_result *res = calloc (1, sizeof (nis_result));
struct ns_request req;
nis_name *names;
nis_error status;
int link_first_try = 0;
int count_links = 0; /* We will follow only 16 links in the deep */
int done = 0;
int name_nr = 0;
nis_name namebuf[2] = {NULL, NULL};
if (res == NULL)
return NULL;
if ((flags & EXPAND_NAME) && (name[strlen (name) - 1] != '.'))
{
names = nis_getnames (name);
if (names == NULL)
{
NIS_RES_STATUS (res) = NIS_NAMEUNREACHABLE;
return res;
}
}
else
{
names = namebuf;
names[0] = (nis_name)name;
}
req.ns_name = names[0];
while (!done)
{
dir_binding bptr;
directory_obj *dir = NULL;
req.ns_object.ns_object_len = 0;
req.ns_object.ns_object_val = NULL;
status = __nisfind_server (req.ns_name, &dir);
if (status != NIS_SUCCESS)
{
NIS_RES_STATUS (res) = status;
return res;
}
status = __nisbind_create (&bptr, dir->do_servers.do_servers_val,
dir->do_servers.do_servers_len, flags);
if (status != NIS_SUCCESS)
{
NIS_RES_STATUS (res) = status;
nis_free_directory (dir);
return res;
}
while (__nisbind_connect (&bptr) != NIS_SUCCESS)
{
if (__nisbind_next (&bptr) != NIS_SUCCESS)
{
__nisbind_destroy (&bptr);
nis_free_directory (dir);
NIS_RES_STATUS (res) = NIS_NAMEUNREACHABLE;
return res;
}
}
do
{
static struct timeval RPCTIMEOUT = {10, 0};
enum clnt_stat result;
again:
result = clnt_call (bptr.clnt, NIS_LOOKUP,
(xdrproc_t) _xdr_ns_request,
(caddr_t) &req, (xdrproc_t) _xdr_nis_result,
(caddr_t) res, RPCTIMEOUT);
if (result != RPC_SUCCESS)
status = NIS_RPCERROR;
else
{
status = NIS_SUCCESS;
if (NIS_RES_STATUS (res) == NIS_SUCCESS)
{
if (__type_of(NIS_RES_OBJECT (res)) == NIS_LINK_OBJ &&
flags & FOLLOW_LINKS) /* We are following links */
{
if (count_links)
free (req.ns_name);
/* if we hit the link limit, bail */
if (count_links > NIS_MAXLINKS)
{
NIS_RES_STATUS (res) = NIS_LINKNAMEERROR;
break;
}
++count_links;
req.ns_name =
strdup (NIS_RES_OBJECT (res)->LI_data.li_name);
if (req.ns_name == NULL)
return NULL;
nis_freeresult (res);
res = calloc (1, sizeof (nis_result));
if (res == NULL)
return NULL;
link_first_try = 1; /* Try at first the old binding */
goto again;
}
}
else
if ((NIS_RES_STATUS (res) == NIS_SYSTEMERROR) ||
(NIS_RES_STATUS (res) == NIS_NOSUCHNAME) ||
(NIS_RES_STATUS (res) == NIS_NOT_ME))
{
if (link_first_try)
{
__nisbind_destroy (&bptr);
nis_free_directory (dir);
if (__nisfind_server (req.ns_name, &dir) != NIS_SUCCESS)
return res;
if (__nisbind_create (&bptr,
dir->do_servers.do_servers_val,
dir->do_servers.do_servers_len,
flags) != NIS_SUCCESS)
{
nis_free_directory (dir);
return res;
}
}
else
if (__nisbind_next (&bptr) != NIS_SUCCESS)
break; /* No more servers to search */
while (__nisbind_connect (&bptr) != NIS_SUCCESS)
{
if (__nisbind_next (&bptr) != NIS_SUCCESS)
{
__nisbind_destroy (&bptr);
nis_free_directory (dir);
return res;
}
}
goto again;
}
break;
}
link_first_try = 0; /* Set it back */
}
while ((flags & HARD_LOOKUP) && status == NIS_RPCERROR);
__nisbind_destroy (&bptr);
nis_free_directory (dir);
if (status != NIS_SUCCESS)
{
NIS_RES_STATUS (res) = status;
return res;
}
switch (NIS_RES_STATUS (res))
{
case NIS_PARTIAL:
case NIS_SUCCESS:
case NIS_S_SUCCESS:
case NIS_LINKNAMEERROR: /* We follow to max links */
case NIS_UNAVAIL: /* NIS+ is not installed, or all servers are down */
++done;
break;
default:
/* Try the next domainname if we don't follow a link */
if (count_links)
{
free (req.ns_name);
NIS_RES_STATUS (res) = NIS_LINKNAMEERROR;
++done;
break;
}
++name_nr;
if (names[name_nr] == NULL)
{
++done;
break;
}
req.ns_name = names[name_nr];
break;
}
}
if (names != namebuf)
nis_freenames (names);
return res;
}
|
