Update.
[glibc.git] / nis / nis_lookup.c
blob924931c0211f527a2c4ab0840b174e1acf079182
1 /* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Thorsten Kukuk <kukuk@uni-paderborn.de>, 1997.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <string.h>
21 #include <rpcsvc/nis.h>
22 #include "nis_xdr.h"
23 #include "nis_intern.h"
25 nis_result *
26 nis_lookup (const_nis_name name, const unsigned int flags)
28 nis_result *res = calloc (1, sizeof (nis_result));
29 struct ns_request req;
30 nis_name *names;
31 nis_error status;
32 int link_first_try = 0;
33 int count_links = 0; /* We will follow only 16 links in the deep */
34 int done = 0;
35 int name_nr = 0;
36 nis_name namebuf[2] = {NULL, NULL};
38 if (res == NULL)
39 return NULL;
41 if ((flags & EXPAND_NAME) && (name[strlen (name) - 1] != '.'))
43 names = nis_getnames (name);
44 if (names == NULL)
46 NIS_RES_STATUS (res) = NIS_NAMEUNREACHABLE;
47 return res;
50 else
52 names = namebuf;
53 names[0] = (nis_name)name;
56 req.ns_name = names[0];
57 while (!done)
59 dir_binding bptr;
60 directory_obj *dir = NULL;
61 req.ns_object.ns_object_len = 0;
62 req.ns_object.ns_object_val = NULL;
64 status = __nisfind_server (req.ns_name, &dir);
65 if (status != NIS_SUCCESS)
67 NIS_RES_STATUS (res) = status;
68 return res;
71 status = __nisbind_create (&bptr, dir->do_servers.do_servers_val,
72 dir->do_servers.do_servers_len, flags);
73 if (status != NIS_SUCCESS)
75 NIS_RES_STATUS (res) = status;
76 nis_free_directory (dir);
77 return res;
80 while (__nisbind_connect (&bptr) != NIS_SUCCESS)
82 if (__nisbind_next (&bptr) != NIS_SUCCESS)
84 __nisbind_destroy (&bptr);
85 nis_free_directory (dir);
86 NIS_RES_STATUS (res) = NIS_NAMEUNREACHABLE;
87 return res;
93 static struct timeval RPCTIMEOUT = {10, 0};
94 enum clnt_stat result;
96 again:
97 result = clnt_call (bptr.clnt, NIS_LOOKUP,
98 (xdrproc_t) _xdr_ns_request,
99 (caddr_t) &req, (xdrproc_t) _xdr_nis_result,
100 (caddr_t) res, RPCTIMEOUT);
102 if (result != RPC_SUCCESS)
103 status = NIS_RPCERROR;
104 else
106 status = NIS_SUCCESS;
108 if (NIS_RES_STATUS (res) == NIS_SUCCESS)
110 if (__type_of(NIS_RES_OBJECT (res)) == NIS_LINK_OBJ &&
111 flags & FOLLOW_LINKS) /* We are following links */
113 if (count_links)
114 free (req.ns_name);
115 /* if we hit the link limit, bail */
116 if (count_links > NIS_MAXLINKS)
118 NIS_RES_STATUS (res) = NIS_LINKNAMEERROR;
119 break;
121 ++count_links;
122 req.ns_name =
123 strdup (NIS_RES_OBJECT (res)->LI_data.li_name);
124 if (req.ns_name == NULL)
125 return NULL;
127 nis_freeresult (res);
128 res = calloc (1, sizeof (nis_result));
129 if (res == NULL)
131 __nisbind_destroy (&bptr);
132 return NULL;
135 link_first_try = 1; /* Try at first the old binding */
136 goto again;
139 else
140 if ((NIS_RES_STATUS (res) == NIS_SYSTEMERROR) ||
141 (NIS_RES_STATUS (res) == NIS_NOSUCHNAME) ||
142 (NIS_RES_STATUS (res) == NIS_NOT_ME))
144 if (link_first_try)
146 __nisbind_destroy (&bptr);
147 nis_free_directory (dir);
149 if (__nisfind_server (req.ns_name, &dir) != NIS_SUCCESS)
150 return res;
152 if (__nisbind_create (&bptr,
153 dir->do_servers.do_servers_val,
154 dir->do_servers.do_servers_len,
155 flags) != NIS_SUCCESS)
157 nis_free_directory (dir);
158 return res;
161 else
162 if (__nisbind_next (&bptr) != NIS_SUCCESS)
163 break; /* No more servers to search */
165 while (__nisbind_connect (&bptr) != NIS_SUCCESS)
167 if (__nisbind_next (&bptr) != NIS_SUCCESS)
169 __nisbind_destroy (&bptr);
170 nis_free_directory (dir);
171 return res;
174 goto again;
176 break;
178 link_first_try = 0; /* Set it back */
180 while ((flags & HARD_LOOKUP) && status == NIS_RPCERROR);
182 __nisbind_destroy (&bptr);
183 nis_free_directory (dir);
185 if (status != NIS_SUCCESS)
187 NIS_RES_STATUS (res) = status;
188 return res;
191 switch (NIS_RES_STATUS (res))
193 case NIS_PARTIAL:
194 case NIS_SUCCESS:
195 case NIS_S_SUCCESS:
196 case NIS_LINKNAMEERROR: /* We follow to max links */
197 case NIS_UNAVAIL: /* NIS+ is not installed, or all servers are down */
198 ++done;
199 break;
200 default:
201 /* Try the next domainname if we don't follow a link */
202 if (count_links)
204 free (req.ns_name);
205 NIS_RES_STATUS (res) = NIS_LINKNAMEERROR;
206 ++done;
207 break;
209 ++name_nr;
210 if (names[name_nr] == NULL)
212 ++done;
213 break;
215 req.ns_name = names[name_nr];
216 break;
220 if (names != namebuf)
221 nis_freenames (names);
223 return res;