1
/* Mail alias file parser in nss_db module.
2
Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
3
This file is part of the GNU C Library.
4
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
6
The GNU C Library is free software; you can redistribute it and/or
7
modify it under the terms of the GNU Library General Public License as
8
published by the Free Software Foundation; either version 2 of the
9
License, or (at your option) any later version.
11
The GNU C Library is distributed in the hope that it will be useful,
12
but WITHOUT ANY WARRANTY; without even the implied warranty of
13
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14
Library General Public License for more details.
16
You should have received a copy of the GNU Library General Public
17
License along with the GNU C Library; see the file COPYING.LIB. If not,
18
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19
Boston, MA 02111-1307, USA. */
29
#include <bits/libc-lock.h>
33
/* Locks the static variables in this file. */
34
__libc_lock_define_initialized (static, lock)
36
/* Maintenance of the shared handle open on the database. */
40
static unsigned int entidx; /* Index for `getaliasent_r'. */
45
_nss_db_setaliasent (int stayopen)
47
enum nss_status status;
49
__libc_lock_lock (lock);
51
status = internal_setent (_PATH_VARDB "aliases.db", &db);
53
/* Remember STAYOPEN flag. */
57
/* Reset the sequential index. */
60
__libc_lock_unlock (lock);
68
_nss_db_endaliasent (void)
70
__libc_lock_lock (lock);
72
internal_endent (&db);
74
/* Reset STAYOPEN flag. */
77
__libc_lock_unlock (lock);
79
return NSS_STATUS_SUCCESS;
82
/* We provide the parse function here. The parser in libnss_files
83
cannot be used. The generation of the db file already resolved all
84
:include: statements so we simply have to parse the list and store
86
static enum nss_status
87
lookup (DBT *key, struct aliasent *result, char *buffer,
88
size_t buflen, int *errnop)
90
enum nss_status status;
93
/* Open the database. */
96
status = internal_setent (_PATH_VARDB "aliases.db", &db);
97
if (status != NSS_STATUS_SUCCESS)
105
if (db->get (db, NULL, key, &value, 0) == 0)
107
const char *src = value.data;
111
result->alias_members_len = 0;
113
/* We now have to fill the BUFFER with all the information. */
114
if (buflen < key->size + 1)
118
return NSS_STATUS_TRYAGAIN;
121
buffer = stpncpy (buffer, key->data, key->size) + 1;
122
buflen -= key->size + 1;
126
const char *end, *upto;
127
while (isspace (*src))
130
end = strchr (src, ',');
132
end = strchr (src, '\0');
133
for (upto = end; upto > src && isspace (upto[-1]); --upto);
137
if ((upto - src) + __alignof__ (char *) > buflen)
139
buffer = stpncpy (buffer, src, upto - src) + 1;
140
buflen -= (upto - src) + __alignof (char *);
141
++result->alias_members_len;
143
src = end + (*end != '\0');
146
/* Now prepare the return. Provide string pointers for the
147
currently selected aliases. */
149
/* Adjust the pointer so it is aligned for storing pointers. */
150
buffer += __alignof__ (char *) - 1;
151
buffer -= ((buffer - (char *) 0) % __alignof__ (char *));
152
result->alias_members = (char **) buffer;
154
/* Compute addresses of alias entry strings. */
155
cp = result->alias_name;
156
for (cnt = 0; cnt < result->alias_members_len; ++cnt)
158
cp = strchr (cp, '\0') + 1;
159
result->alias_members[cnt] = cp;
162
status = (result->alias_members_len == 0
163
? NSS_STATUS_RETURN : NSS_STATUS_SUCCESS);
166
status = NSS_STATUS_NOTFOUND;
169
internal_endent (&db);
175
_nss_db_getaliasent_r (struct aliasent *result, char *buffer, size_t buflen,
178
/* Return next entry in alias file. */
179
enum nss_status status;
183
__libc_lock_lock (lock);
184
key.size = snprintf (key.data = buf, sizeof buf, "0%u", entidx++);
186
status = lookup (&key, result, buffer, buflen, errnop);
187
if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
188
/* Give the user a chance to get the same entry with a larger buffer. */
190
__libc_lock_unlock (lock);
197
_nss_db_getaliasbyname_r (const char *name, struct aliasent *result,
198
char *buffer, size_t buflen, int *errnop)
201
enum nss_status status;
203
key.size = 1 + strlen (name);
205
key.data = alloca (key.size);
206
((char *) key.data)[0] = '.';
207
memcpy (&((char *) key.data)[1], name, key.size - 1);
210
__libc_lock_lock (lock);
211
status = lookup (&key, result, buffer, buflen, errnop);
212
__libc_lock_unlock (lock);