1 /* Netgroup file parser in nss_files modules.
2 Copyright (C) 1996, 1997, 2000, 2004 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
30 #define DATAFILE "/etc/netgroup"
33 #define EXPAND(needed) \
36 size_t old_cursor = result->cursor - result->data; \
37 void *old_data = result->data; \
39 result->data_size += 512 > 2 * needed ? 512 : 2 * needed; \
40 result->data = realloc (result->data, result->data_size); \
42 if (result->data == NULL) \
45 status = NSS_STATUS_UNAVAIL; \
49 result->cursor = result->data + old_cursor; \
55 _nss_files_setnetgrent (const char *group, struct __netgrent *result)
58 enum nss_status status;
61 return NSS_STATUS_UNAVAIL;
63 /* Find the netgroups file and open it. */
64 fp = fopen (DATAFILE, "r");
66 status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
69 /* Read the file line by line and try to find the description
70 GROUP. We must take care for long lines. */
73 const ssize_t group_len = strlen (group);
75 status = NSS_STATUS_NOTFOUND;
76 result->cursor = result->data;
80 ssize_t curlen = getline (&line, &line_len, fp);
85 status = NSS_STATUS_NOTFOUND;
89 found = (curlen > group_len && strncmp (line, group, group_len) == 0
90 && isspace (line[group_len]));
92 /* Read the whole line (including continuation) and store it
93 if FOUND in nonzero. Otherwise we don't need it. */
96 /* Store the data from the first line. */
97 EXPAND (curlen - group_len);
98 memcpy (result->cursor, &line[group_len + 1],
100 result->cursor += (curlen - group_len) - 1;
103 while (line[curlen - 1] == '\n' && line[curlen - 2] == '\\')
105 /* Yes, we have a continuation line. */
107 /* Remove these characters from the stored line. */
111 curlen = getline (&line, &line_len, fp);
117 /* Make sure we have enough room. */
118 EXPAND (1 + curlen + 1);
120 /* Add separator in case next line starts immediately. */
121 *result->cursor++ = ' ';
124 memcpy (result->cursor, line, curlen + 1);
125 result->cursor += curlen;
131 /* Now we have read the line. */
132 status = NSS_STATUS_SUCCESS;
133 result->cursor = result->data;
140 /* We don't need the file and the line buffer anymore. */
150 _nss_files_endnetgrent (struct __netgrent *result)
152 /* Free allocated memory for data if some is present. */
153 if (result->data != NULL)
157 result->data_size = 0;
158 result->cursor = NULL;
161 return NSS_STATUS_SUCCESS;
165 strip_whitespace (char *str)
169 /* Skip leading spaces. */
170 while (isspace (*cp))
174 while (*cp != '\0' && ! isspace(*cp))
177 /* Null-terminate, stripping off any trailing spaces. */
180 return *str == '\0' ? NULL : str;
184 _nss_netgroup_parseline (char **cursor, struct __netgrent *result,
185 char *buffer, size_t buflen, int *errnop)
187 enum nss_status status;
188 const char *host, *user, *domain;
191 /* Some sanity checks. */
193 return NSS_STATUS_NOTFOUND;
195 /* First skip leading spaces. */
196 while (isspace (*cp))
201 /* We have a list of other netgroups. */
204 while (*cp != '\0' && ! isspace (*cp))
209 /* It is another netgroup name. */
210 int last = *cp == '\0';
212 result->type = group_val;
213 result->val.group = name;
220 return NSS_STATUS_SUCCESS;
223 return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN;
226 /* Match host name. */
230 return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN;
232 /* Match user name. */
236 return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN;
238 /* Match domain name. */
242 return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN;
246 /* When we got here we have found an entry. Before we can copy it
247 to the private buffer we have to make sure it is big enough. */
248 if (cp - host > buflen)
251 status = NSS_STATUS_UNAVAIL;
255 memcpy (buffer, host, cp - host);
256 result->type = triple_val;
258 buffer[(user - host) - 1] = '\0'; /* Replace ',' with '\0'. */
259 result->val.triple.host = strip_whitespace (buffer);
261 buffer[(domain - host) - 1] = '\0'; /* Replace ',' with '\0'. */
262 result->val.triple.user = strip_whitespace (buffer + (user - host));
264 buffer[(cp - host) - 1] = '\0'; /* Replace ')' with '\0'. */
265 result->val.triple.domain = strip_whitespace (buffer + (domain - host));
267 status = NSS_STATUS_SUCCESS;
269 /* Remember where we stopped reading. */
277 libnss_files_hidden_def (_nss_netgroup_parseline)
281 _nss_files_getnetgrent_r (struct __netgrent *result, char *buffer,
282 size_t buflen, int *errnop)
284 enum nss_status status;
286 status = _nss_netgroup_parseline (&result->cursor, result, buffer, buflen,