/* Common code for file-based databases in nss_files module.
-Copyright (C) 1996 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+ Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
-The GNU C Library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 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
-Library General Public License for more details.
+ 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
+ Library General Public License for more details.
-You should have received a copy of the GNU Library General Public
-License along with the GNU C Library; see the file COPYING.LIB. If
-not, write to the Free Software Foundation, Inc., 675 Mass Ave,
-Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
#include <stdio.h>
#include <ctype.h>
#include <assert.h>
-#include <libc-lock.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <bits/libc-lock.h>
#include "nsswitch.h"
/* These symbols are defined by the including source file:
ENTNAME -- database name of the structure and functions (hostent, pwent).
STRUCTURE -- struct name, define only if not ENTNAME (passwd, group).
- DATAFILE -- string of the database file's name.
+ DATABASE -- string of the database file's name ("hosts", "passwd").
NEED_H_ERRNO - defined iff an arg `int *herrnop' is used.
- MIDLINE_COMMENTS - defined iff # before \n terminates a database line.
+
+ Also see files-parse.c.
*/
-#define ENTNAME_r CONCAT(ENTNAME,_r)
+#define ENTNAME_r CONCAT(ENTNAME,_r)
+
+#define DATAFILE "/etc/" DATABASE
#ifdef NEED_H_ERRNO
-#define H_ERRNO_PROTO , int *herrnop
-#define H_ERRNO_ARG , herrnop
-#define H_ERRNO_SET(val) (*herrnop = (val))
+# include <netdb.h>
+# define H_ERRNO_PROTO , int *herrnop
+# define H_ERRNO_ARG , herrnop
+# define H_ERRNO_SET(val) (*herrnop = (val))
#else
-#define H_ERRNO_PROTO
-#define H_ERRNO_ARG
-#define H_ERRNO_SET(val) ((void) 0)
+# define H_ERRNO_PROTO
+# define H_ERRNO_ARG
+# define H_ERRNO_SET(val) ((void) 0)
#endif
/* Locks the static variables in this file. */
-__libc_lock_define_initialized (static, lock);
+__libc_lock_define_initialized (static, lock)
\f
/* Maintenance of the shared stream open on the database file. */
static FILE *stream;
+static fpos_t position;
+static enum { none, getent, getby } last_use;
static int keep_stream;
/* Open database file if not already opened. */
-static int
+static enum nss_status
internal_setent (int stayopen)
{
- int status = NSS_STATUS_SUCCESS;
+ enum nss_status status = NSS_STATUS_SUCCESS;
if (stream == NULL)
{
stream = fopen (DATAFILE, "r");
if (stream == NULL)
- status = NSS_STATUS_UNAVAIL;
+ status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
+ else
+ {
+ /* We have to make sure the file is `closed on exec'. */
+ int result, flags;
+
+ result = flags = fcntl (fileno (stream), F_GETFD, 0);
+ if (result >= 0)
+ {
+ flags |= FD_CLOEXEC;
+ result = fcntl (fileno (stream), F_SETFD, flags);
+ }
+ if (result < 0)
+ {
+ /* Something went wrong. Close the stream and return a
+ failure. */
+ fclose (stream);
+ stream = NULL;
+ status = NSS_STATUS_UNAVAIL;
+ }
+ }
}
else
rewind (stream);
/* Thread-safe, exported version of that. */
-int
+enum nss_status
CONCAT(_nss_files_set,ENTNAME) (int stayopen)
{
- int status;
+ enum nss_status status;
__libc_lock_lock (lock);
status = internal_setent (stayopen);
+ if (status == NSS_STATUS_SUCCESS && fgetpos (stream, &position) < 0)
+ {
+ fclose (stream);
+ stream = NULL;
+ status = NSS_STATUS_UNAVAIL;
+ }
+
+ last_use = getent;
+
__libc_lock_unlock (lock);
return status;
/* Thread-safe, exported version of that. */
-int
+enum nss_status
CONCAT(_nss_files_end,ENTNAME) (void)
{
__libc_lock_lock (lock);
char *p;
struct parser_data *data = (void *) buffer;
int linebuflen = buffer + buflen - data->linebuffer;
-
- /* Be prepared that the set*ent function was not called before. */
- if (stream == NULL)
- {
- enum nss_status status;
-
- status = internal_setent (0);
- if (status != NSS_STATUS_SUCCESS)
- return status;
- }
+ int parse_result;
if (buflen < (int) sizeof *data + 1)
{
- errno = ERANGE;
- return NSS_STATUS_NOTFOUND;
+ __set_errno (ERANGE);
+ H_ERRNO_SET (NETDB_INTERNAL);
+ return NSS_STATUS_TRYAGAIN;
}
do
{
+ /* Terminate the line so that we can test for overflow. */
+ data->linebuffer[linebuflen - 1] = '\0';
+
p = fgets (data->linebuffer, linebuflen, stream);
if (p == NULL)
{
H_ERRNO_SET (HOST_NOT_FOUND);
return NSS_STATUS_NOTFOUND;
}
-
- /* Terminate the line for any case. */
- data->linebuffer[linebuflen - 1] = '\0';
+ else if (data->linebuffer[linebuflen - 1] != '\0')
+ {
+ /* The line is too long. Give the user the opportunity to
+ enlarge the buffer. */
+ __set_errno (ERANGE);
+ H_ERRNO_SET (NETDB_INTERNAL);
+ return NSS_STATUS_TRYAGAIN;
+ }
/* Skip leading blanks. */
while (isspace (*p))
++p;
- } while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
- /* Parse the line. If it is invalid, loop to
- get the next line of the file to parse. */
- ! parse_line (p, result, data, buflen));
+ }
+ while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */
+ /* Parse the line. If it is invalid, loop to get the next
+ line of the file to parse. */
+ || ! (parse_result = parse_line (p, result, data, buflen)));
/* Filled in RESULT with the next entry from the database file. */
- return NSS_STATUS_SUCCESS;
+ return parse_result == -1 ? NSS_STATUS_TRYAGAIN : NSS_STATUS_SUCCESS;
}
/* Return the next entry from the database file, doing locking. */
-int
+enum nss_status
CONCAT(_nss_files_get,ENTNAME_r) (struct STRUCTURE *result,
- char *buffer, int buflen H_ERRNO_PROTO)
+ char *buffer, size_t buflen H_ERRNO_PROTO)
{
/* Return next entry in host file. */
- int status;
+ enum nss_status status = NSS_STATUS_SUCCESS;
__libc_lock_lock (lock);
- status = internal_getent (result, buffer, buflen H_ERRNO_ARG);
+ /* Be prepared that the set*ent function was not called before. */
+ if (stream == NULL)
+ status = internal_setent (0);
+
+ if (status == NSS_STATUS_SUCCESS)
+ {
+ /* If the last use was not by the getent function we need the
+ position the stream. */
+ if (last_use != getent)
+ if (fsetpos (stream, &position) < 0)
+ status = NSS_STATUS_UNAVAIL;
+ else
+ last_use = getent;
+
+ if (status == NSS_STATUS_SUCCESS)
+ {
+ status = internal_getent (result, buffer, buflen H_ERRNO_ARG);
+
+ /* Remember this position if we were successful. If the
+ operation failed we give the user a chance to repeat the
+ operation (perhaps the buffer was too small). */
+ if (status == NSS_STATUS_SUCCESS)
+ fgetpos (stream, &position);
+ else
+ /* We must make sure we reposition the stream the next call. */
+ last_use = none;
+ }
+ }
__libc_lock_unlock (lock);
NAME is the name of the lookup; e.g. `hostbyname'.
+ KEYSIZE and KEYPATTERN are ignored here but used by ../nss_db/db-XXX.c.
+
PROTO describes the arguments for the lookup key;
e.g. `const char *hostname'.
BREAK_IF_MATCH is a block of code which compares `struct STRUCTURE *result'
to the lookup key arguments and does `break;' if they match. */
-#define DB_LOOKUP(name, break_if_match, proto...) \
+#define DB_LOOKUP(name, keysize, keypattern, break_if_match, proto...) \
enum nss_status \
_nss_files_get##name##_r (proto, \
struct STRUCTURE *result, \
- char *buffer, int buflen H_ERRNO_PROTO) \
+ char *buffer, size_t buflen H_ERRNO_PROTO) \
{ \
enum nss_status status; \
\
__libc_lock_lock (lock); \
\
/* Reset file pointer to beginning or open file. */ \
- internal_setent (keep_stream); \
+ status = internal_setent (keep_stream); \
+ \
+ if (status == NSS_STATUS_SUCCESS) \
+ { \
+ /* Tell getent function that we have repositioned the file pointer. */ \
+ last_use = getby; \
\
- while ((status = internal_getent (result, buffer, buflen H_ERRNO_ARG)) \
- == NSS_STATUS_SUCCESS) \
- { break_if_match } \
+ while ((status = internal_getent (result, buffer, buflen H_ERRNO_ARG)) \
+ == NSS_STATUS_SUCCESS) \
+ { break_if_match } \
\
- if (! keep_stream) \
- internal_endent (); \
+ if (! keep_stream) \
+ internal_endent (); \
+ } \
\
__libc_lock_unlock (lock); \
\
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