source: branches/samba-3.2.x/source/winbindd/nss_info.c@ 201

Last change on this file since 201 was 133, checked in by Paul Smedley, 18 years ago

Update trunk to 3.2.0pre3
File size: 7.9 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 Idmap NSS headers
4
5 Copyright (C) Gerald Carter 2006
6
7 This library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 3 of the License, or (at your option) any later version.
11
12 This library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Library General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19*/
20
21#include "includes.h"
22#include "nss_info.h"
23
24static struct nss_function_entry *backends = NULL;
25static struct nss_domain_entry *nss_domain_list = NULL;
26
27/**********************************************************************
28 Get idmap nss methods.
29**********************************************************************/
30
31static struct nss_function_entry *nss_get_backend(const char *name )
32{
33 struct nss_function_entry *entry = backends;
34
35 for(entry = backends; entry; entry = entry->next) {
36 if ( strequal(entry->name, name) )
37 return entry;
38 }
39
40 return NULL;
41}
42
43/*********************************************************************
44 Allow a module to register itself as a backend.
45**********************************************************************/
46
47 NTSTATUS smb_register_idmap_nss(int version, const char *name, struct nss_info_methods *methods)
48{
49 struct nss_function_entry *entry;
50
51 if ((version != SMB_NSS_INFO_INTERFACE_VERSION)) {
52 DEBUG(0, ("smb_register_idmap_nss: Failed to register idmap_nss module.\n"
53 "The module was compiled against SMB_NSS_INFO_INTERFACE_VERSION %d,\n"
54 "current SMB_NSS_INFO_INTERFACE_VERSION is %d.\n"
55 "Please recompile against the current version of samba!\n",
56 version, SMB_NSS_INFO_INTERFACE_VERSION));
57 return NT_STATUS_OBJECT_TYPE_MISMATCH;
58 }
59
60 if (!name || !name[0] || !methods) {
61 DEBUG(0,("smb_register_idmap_nss: called with NULL pointer or empty name!\n"));
62 return NT_STATUS_INVALID_PARAMETER;
63 }
64
65 if ( nss_get_backend(name) ) {
66 DEBUG(0,("smb_register_idmap_nss: idmap module %s "
67 "already registered!\n", name));
68 return NT_STATUS_OBJECT_NAME_COLLISION;
69 }
70
71 entry = SMB_XMALLOC_P(struct nss_function_entry);
72 entry->name = smb_xstrdup(name);
73 entry->methods = methods;
74
75 DLIST_ADD(backends, entry);
76 DEBUG(5, ("smb_register_idmap_nss: Successfully added idmap "
77 "nss backend '%s'\n", name));
78
79 return NT_STATUS_OK;
80}
81
82/********************************************************************
83 *******************************************************************/
84
85static bool parse_nss_parm( const char *config, char **backend, char **domain )
86{
87 char *p;
88 char *q;
89 int len;
90
91 *backend = *domain = NULL;
92
93 if ( !config )
94 return False;
95
96 p = strchr( config, ':' );
97
98 /* if no : then the string must be the backend name only */
99
100 if ( !p ) {
101 *backend = SMB_STRDUP( config );
102 return (*backend != NULL);
103 }
104
105 /* split the string and return the two parts */
106
107 if ( strlen(p+1) > 0 ) {
108 *domain = SMB_STRDUP( p+1 );
109 }
110
111 len = PTR_DIFF(p,config)+1;
112 if ( (q = SMB_MALLOC_ARRAY( char, len )) == NULL ) {
113 SAFE_FREE( *backend );
114 return False;
115 }
116
117 StrnCpy( q, config, len-1);
118 q[len-1] = '\0';
119 *backend = q;
120
121 return True;
122}
123
124/********************************************************************
125 Each nss backend must not store global state, but rather be able
126 to initialize the state on a per domain basis.
127 *******************************************************************/
128
129 NTSTATUS nss_init( const char **nss_list )
130{
131 NTSTATUS status;
132 static NTSTATUS nss_initialized = NT_STATUS_UNSUCCESSFUL;
133 int i;
134 char *backend, *domain;
135 struct nss_function_entry *nss_backend;
136 struct nss_domain_entry *nss_domain;
137
138 /* check for previous successful initializations */
139
140 if ( NT_STATUS_IS_OK(nss_initialized) )
141 return NT_STATUS_OK;
142
143 /* The "template" backend should alqays be registered as it
144 is a static module */
145
146 if ( (nss_backend = nss_get_backend( "template" )) == NULL ) {
147 static_init_nss_info;
148 }
149
150 /* Create the list of nss_domains (loading any shared plugins
151 as necessary) */
152
153 for ( i=0; nss_list && nss_list[i]; i++ ) {
154
155 if ( !parse_nss_parm(nss_list[i], &backend, &domain) ) {
156 DEBUG(0,("nss_init: failed to parse \"%s\"!\n",
157 nss_list[i]));
158 continue;
159 }
160
161 /* validate the backend */
162
163 if ( (nss_backend = nss_get_backend( backend )) == NULL ) {
164 /* attempt to register the backend */
165 status = smb_probe_module( "nss_info", backend );
166 if ( !NT_STATUS_IS_OK(status) ) {
167 continue;
168 }
169
170 /* try again */
171 if ( (nss_backend = nss_get_backend( backend )) == NULL ) {
172 DEBUG(0,("nss_init: unregistered backend %s!. Skipping\n",
173 backend));
174 continue;
175 }
176
177 }
178
179 /* fill in the nss_domain_entry and add it to the
180 list of domains */
181
182 nss_domain = TALLOC_ZERO_P( nss_domain_list, struct nss_domain_entry );
183 if ( !nss_domain ) {
184 DEBUG(0,("nss_init: talloc() failure!\n"));
185 return NT_STATUS_NO_MEMORY;
186 }
187