1 /* Netgroup file parser in nss_files modules.
2 Copyright (C) 1996, 1997, 2000, 2004, 2005 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 Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the 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 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 #include <stdio_ext.h>
31 #define DATAFILE "/etc/netgroup"
33 libnss_files_hidden_proto (_nss_files_endnetgrent)
35 #define EXPAND(needed) \
38 size_t old_cursor = result->cursor - result->data; \
39 void *old_data = result->data; \
41 result->data_size += 512 > 2 * needed ? 512 : 2 * needed; \
42 result->data = realloc (result->data, result->data_size); \
44 if (result->data == NULL) \
47 status = NSS_STATUS_UNAVAIL; \
51 result->cursor = result->data + old_cursor; \
57 _nss_files_setnetgrent (const char *group, struct __netgrent *result)
60 enum nss_status status;
63 return NSS_STATUS_UNAVAIL;
65 /* Find the netgroups file and open it. */
66 fp = fopen (DATAFILE, "r");
68 status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
71 /* Read the file line by line and try to find the description
72 GROUP. We must take care for long lines. */
75 const ssize_t group_len = strlen (group);
77 status = NSS_STATUS_NOTFOUND;
78 result->cursor = result->data;
80 __fsetlocking (fp, FSETLOCKING_BYCALLER);
82 while (!feof_unlocked (fp))
84 ssize_t curlen = getline (&line, &line_len, fp);
89 status = NSS_STATUS_NOTFOUND;
93 found = (curlen > group_len && strncmp (line, group, group_len) == 0
94 && isspace (line[group_len]));
96 /* Read the whole line (including continuation) and store it
97 if FOUND in nonzero. Otherwise we don't need it. */
100 /* Store the data from the first line. */
101 EXPAND (curlen - group_len);
102 memcpy (result->cursor, &line[group_len + 1],
104 result->cursor += (curlen - group_len) - 1;
107 while (line[curlen - 1] == '\n' && line[curlen - 2] == '\\')
109 /* Yes, we have a continuation line. */
111 /* Remove these characters from the stored line. */
115 curlen = getline (&line, &line_len, fp);
121 /* Make sure we have enough room. */
122 EXPAND (1 + curlen + 1);
124 /* Add separator in case next line starts immediately. */
125 *result->cursor++ = ' ';
128 memcpy (result->cursor, line, curlen + 1);
129 result->cursor += curlen;
135 /* Now we have read the line. */
136 status = NSS_STATUS_SUCCESS;
137 result->cursor = result->data;
144 /* We don't need the file and the line buffer anymore. */
148 if (status != NSS_STATUS_SUCCESS)
149 _nss_files_endnetgrent (result);
157 _nss_files_endnetgrent (struct __netgrent *result)
159 /* Free allocated memory for data if some is present. */
162 result->data_size = 0;
163 result->cursor = NULL;
164 return NSS_STATUS_SUCCESS;
166 libnss_files_hidden_def (_nss_files_endnetgrent)
169 strip_whitespace (char *str)
173 /* Skip leading spaces. */
174 while (isspace (*cp))
178 while (*cp != '\0' && ! isspace(*cp))
181 /* Null-terminate, stripping off any trailing spaces. */
184 return *str == '\0' ? NULL : str;
188 _nss_netgroup_parseline (char **cursor, struct __netgrent *result,
189 char *buffer, size_t buflen, int *errnop)
191 enum nss_status status;
192 const char *host, *user, *domain;
195 /* Some sanity checks. */
197 return NSS_STATUS_NOTFOUND;
199 /* First skip leading spaces. */
200 while (isspace (*cp))
205 /* We have a list of other netgroups. */
208 while (*cp != '\0' && ! isspace (*cp))
213 /* It is another netgroup name. */
214 int last = *cp == '\0';
216 result->type = group_val;
217 result->val.group = name;
224 return NSS_STATUS_SUCCESS;
227 return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN;
230 /* Match host name. */
234 return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN;
236 /* Match user name. */
240 return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN;
242 /* Match domain name. */
246 return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN;
250 /* When we got here we have found an entry. Before we can copy it
251 to the private buffer we have to make sure it is big enough. */
252 if (cp - host > buflen)
255 status = NSS_STATUS_UNAVAIL;
259 memcpy (buffer, host, cp - host);
260 result->type = triple_val;
262 buffer[(user - host) - 1] = '\0'; /* Replace ',' with '\0'. */
263 result->val.triple.host = strip_whitespace (buffer);
265 buffer[(domain - host) - 1] = '\0'; /* Replace ',' with '\0'. */
266 result->val.triple.user = strip_whitespace (buffer + (user - host));
268 buffer[(cp - host) - 1] = '\0'; /* Replace ')' with '\0'. */
269 result->val.triple.domain = strip_whitespace (buffer + (domain - host));
271 status = NSS_STATUS_SUCCESS;
273 /* Remember where we stopped reading. */
281 libnss_files_hidden_def (_nss_netgroup_parseline)
285 _nss_files_getnetgrent_r (struct __netgrent *result, char *buffer,
286 size_t buflen, int *errnop)
288 enum nss_status status;
290 status = _nss_netgroup_parseline (&result->cursor, result, buffer, buflen,