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glibc/nss/nss_files/files-netgrp.c
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/* Netgroup file parser in nss_files modules. | |
Copyright (C) 1996-2013 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <ctype.h> | |
#include <errno.h> | |
#include <netdb.h> | |
#include <stdio.h> | |
#include <stdio_ext.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include "nsswitch.h" | |
#include "netgroup.h" | |
#define DATAFILE "/etc/netgroup" | |
libnss_files_hidden_proto (_nss_files_endnetgrent) | |
#define EXPAND(needed) \ | |
do \ | |
{ \ | |
size_t old_cursor = result->cursor - result->data; \ | |
void *old_data = result->data; \ | |
\ | |
result->data_size += 512 > 2 * needed ? 512 : 2 * needed; \ | |
result->data = realloc (result->data, result->data_size); \ | |
\ | |
if (result->data == NULL) \ | |
{ \ | |
free (old_data); \ | |
status = NSS_STATUS_UNAVAIL; \ | |
goto the_end; \ | |
} \ | |
\ | |
result->cursor = result->data + old_cursor; \ | |
} \ | |
while (0) | |
enum nss_status | |
_nss_files_setnetgrent (const char *group, struct __netgrent *result) | |
{ | |
FILE *fp; | |
enum nss_status status; | |
if (group[0] == '\0') | |
return NSS_STATUS_UNAVAIL; | |
/* Find the netgroups file and open it. */ | |
fp = fopen (DATAFILE, "rce"); | |
if (fp == NULL) | |
status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL; | |
else | |
{ | |
/* Read the file line by line and try to find the description | |
GROUP. We must take care for long lines. */ | |
char *line = NULL; | |
size_t line_len = 0; | |
const ssize_t group_len = strlen (group); | |
status = NSS_STATUS_NOTFOUND; | |
result->cursor = result->data; | |
__fsetlocking (fp, FSETLOCKING_BYCALLER); | |
while (!feof_unlocked (fp)) | |
{ | |
ssize_t curlen = getline (&line, &line_len, fp); | |
int found; | |
if (curlen < 0) | |
{ | |
status = NSS_STATUS_NOTFOUND; | |
break; | |
} | |
found = (curlen > group_len && strncmp (line, group, group_len) == 0 | |
&& isspace (line[group_len])); | |
/* Read the whole line (including continuation) and store it | |
if FOUND in nonzero. Otherwise we don't need it. */ | |
if (found) | |
{ | |
/* Store the data from the first line. */ | |
EXPAND (curlen - group_len); | |
memcpy (result->cursor, &line[group_len + 1], | |
curlen - group_len); | |
result->cursor += (curlen - group_len) - 1; | |
} | |
while (line[curlen - 1] == '\n' && line[curlen - 2] == '\\') | |
{ | |
/* Yes, we have a continuation line. */ | |
if (found) | |
/* Remove these characters from the stored line. */ | |
result->cursor -= 2; | |
/* Get next line. */ | |
curlen = getline (&line, &line_len, fp); | |
if (curlen <= 0) | |
break; | |
if (found) | |
{ | |
/* Make sure we have enough room. */ | |
EXPAND (1 + curlen + 1); | |
/* Add separator in case next line starts immediately. */ | |
*result->cursor++ = ' '; | |
/* Copy new line. */ | |
memcpy (result->cursor, line, curlen + 1); | |
result->cursor += curlen; | |
} | |
} | |
if (found) | |
{ | |
/* Now we have read the line. */ | |
status = NSS_STATUS_SUCCESS; | |
result->cursor = result->data; | |
result->first = 1; | |
break; | |
} | |
} | |
the_end: | |
/* We don't need the file and the line buffer anymore. */ | |
free (line); | |
fclose (fp); | |
if (status != NSS_STATUS_SUCCESS) | |
_nss_files_endnetgrent (result); | |
} | |
return status; | |
} | |
enum nss_status | |
_nss_files_endnetgrent (struct __netgrent *result) | |
{ | |
/* Free allocated memory for data if some is present. */ | |
free (result->data); | |
result->data = NULL; | |
result->data_size = 0; | |
result->cursor = NULL; | |
return NSS_STATUS_SUCCESS; | |
} | |
libnss_files_hidden_def (_nss_files_endnetgrent) | |
static char * | |
strip_whitespace (char *str) | |
{ | |
char *cp = str; | |
/* Skip leading spaces. */ | |
while (isspace (*cp)) | |
cp++; | |
str = cp; | |
while (*cp != '\0' && ! isspace(*cp)) | |
cp++; | |
/* Null-terminate, stripping off any trailing spaces. */ | |
*cp = '\0'; | |
return *str == '\0' ? NULL : str; | |
} | |
enum nss_status | |
_nss_netgroup_parseline (char **cursor, struct __netgrent *result, | |
char *buffer, size_t buflen, int *errnop) | |
{ | |
enum nss_status status; | |
const char *host, *user, *domain; | |
char *cp = *cursor; | |
/* Some sanity checks. */ | |
if (cp == NULL) | |
return NSS_STATUS_NOTFOUND; | |
/* First skip leading spaces. */ | |
while (isspace (*cp)) | |
++cp; | |
if (*cp != '(') | |
{ | |
/* We have a list of other netgroups. */ | |
char *name = cp; | |
while (*cp != '\0' && ! isspace (*cp)) | |
++cp; | |
if (name != cp) | |
{ | |
/* It is another netgroup name. */ | |
int last = *cp == '\0'; | |
result->type = group_val; | |
result->val.group = name; | |
*cp = '\0'; | |
if (! last) | |
++cp; | |
*cursor = cp; | |
result->first = 0; | |
return NSS_STATUS_SUCCESS; | |
} | |
return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN; | |
} | |
/* Match host name. */ | |
host = ++cp; | |
while (*cp != ',') | |
if (*cp++ == '\0') | |
return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN; | |
/* Match user name. */ | |
user = ++cp; | |
while (*cp != ',') | |
if (*cp++ == '\0') | |
return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN; | |
/* Match domain name. */ | |
domain = ++cp; | |
while (*cp != ')') | |
if (*cp++ == '\0') | |
return result->first ? NSS_STATUS_NOTFOUND : NSS_STATUS_RETURN; | |
++cp; | |
/* When we got here we have found an entry. Before we can copy it | |
to the private buffer we have to make sure it is big enough. */ | |
if (cp - host > buflen) | |
{ | |
*errnop = ERANGE; | |
status = NSS_STATUS_UNAVAIL; | |
} | |
else | |
{ | |
memcpy (buffer, host, cp - host); | |
result->type = triple_val; | |
buffer[(user - host) - 1] = '\0'; /* Replace ',' with '\0'. */ | |
result->val.triple.host = strip_whitespace (buffer); | |
buffer[(domain - host) - 1] = '\0'; /* Replace ',' with '\0'. */ | |
result->val.triple.user = strip_whitespace (buffer + (user - host)); | |
buffer[(cp - host) - 1] = '\0'; /* Replace ')' with '\0'. */ | |
result->val.triple.domain = strip_whitespace (buffer + (domain - host)); | |
status = NSS_STATUS_SUCCESS; | |
/* Remember where we stopped reading. */ | |
*cursor = cp; | |
result->first = 0; | |
} | |
return status; | |
} | |
libnss_files_hidden_def (_nss_netgroup_parseline) | |
enum nss_status | |
_nss_files_getnetgrent_r (struct __netgrent *result, char *buffer, | |
size_t buflen, int *errnop) | |
{ | |
enum nss_status status; | |
status = _nss_netgroup_parseline (&result->cursor, result, buffer, buflen, | |
errnop); | |
return status; | |
} |