222 lines
5.6 KiB
C
222 lines
5.6 KiB
C
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/* Common code for file-based databases in nss_files module.
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Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include <ctype.h>
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#include <assert.h>
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#include <libc-lock.h>
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#include "nsswitch.h"
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/* These symbols are defined by the including source file:
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ENTNAME -- database name of the structure and functions (hostent, pwent).
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STRUCTURE -- struct name, define only if not ENTNAME (passwd, group).
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DATAFILE -- string of the database file's name.
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NEED_H_ERRNO - defined iff an arg `int *herrnop' is used.
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MIDLINE_COMMENTS - defined iff # before \n terminates a database line.
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*/
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#define ENTNAME_r CONCAT(ENTNAME,_r)
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#ifdef NEED_H_ERRNO
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#define H_ERRNO_PROTO , int *herrnop
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#define H_ERRNO_ARG , herrnop
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#define H_ERRNO_SET(val) (*herrnop = (val))
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#else
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#define H_ERRNO_PROTO
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#define H_ERRNO_ARG
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#define H_ERRNO_SET(val) ((void) 0)
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#endif
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/* Locks the static variables in this file. */
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__libc_lock_define_initialized (static, lock);
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/* Maintenance of the shared stream open on the database file. */
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static FILE *stream;
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static int keep_stream;
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/* Open database file if not already opened. */
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static int
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internal_setent (int stayopen)
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{
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int status = NSS_STATUS_SUCCESS;
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if (stream == NULL)
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{
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stream = fopen (DATAFILE, "r");
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if (stream == NULL)
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status = NSS_STATUS_UNAVAIL;
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}
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else
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rewind (stream);
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/* Remember STAYOPEN flag. */
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if (stream != NULL)
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keep_stream |= stayopen;
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return status;
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}
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/* Thread-safe, exported version of that. */
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int
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CONCAT(_nss_files_set,ENTNAME) (int stayopen)
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{
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int status;
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__libc_lock_lock (lock);
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status = internal_setent (stayopen);
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__libc_lock_unlock (lock);
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return status;
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}
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/* Close the database file. */
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static void
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internal_endent (void)
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{
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if (stream != NULL)
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{
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fclose (stream);
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stream = NULL;
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}
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/* Reset STAYOPEN flag. */
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keep_stream = 0;
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}
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/* Thread-safe, exported version of that. */
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int
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CONCAT(_nss_files_end,ENTNAME) (void)
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{
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__libc_lock_lock (lock);
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internal_endent ();
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__libc_lock_unlock (lock);
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return NSS_STATUS_SUCCESS;
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}
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/* Parsing the database file into `struct STRUCTURE' data structures. */
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static enum nss_status
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internal_getent (struct STRUCTURE *result,
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char *buffer, int buflen H_ERRNO_PROTO)
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{
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char *p;
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struct parser_data *data = (void *) buffer;
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int linebuflen = buffer + buflen - data->linebuffer;
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/* Someone called internal_setent before calling us, so if the
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stream is not open now the file could not be opened. */
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if (stream == NULL)
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{
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H_ERRNO_SET (NETDB_INTERNAL);
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return NSS_STATUS_UNAVAIL;
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}
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if (buflen < sizeof *data + 1)
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{
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errno = ERANGE;
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return NSS_STATUS_NOTFOUND;
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}
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do
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{
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p = fgets (data->linebuffer, linebuflen, stream);
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if (p == NULL)
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{
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/* End of file or read error. */
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H_ERRNO_SET (HOST_NOT_FOUND);
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return NSS_STATUS_NOTFOUND;
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}
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/* Skip leading blanks. */
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while (isspace (*p))
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++p;
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} while (*p == '\0' || *p == '#' || /* Ignore empty and comment lines. */
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/* Parse the line. If it is invalid, loop to
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get the next line of the file to parse. */
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! parse_line (p, result, data, buflen));
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/* Filled in RESULT with the next entry from the database file. */
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return NSS_STATUS_SUCCESS;
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}
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/* Return the next entry from the database file, doing locking. */
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int
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CONCAT(_nss_files_get,ENTNAME_r) (struct STRUCTURE *result,
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char *buffer, int buflen H_ERRNO_PROTO)
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{
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/* Return next entry in host file. */
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int status;
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__libc_lock_lock (lock);
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status = internal_getent (result, buffer, buflen H_ERRNO_ARG);
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__libc_lock_unlock (lock);
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return status;
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}
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/* Macro for defining lookup functions for this file-based database.
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NAME is the name of the lookup; e.g. `hostbyname'.
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PROTO describes the arguments for the lookup key;
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e.g. `const char *hostname'.
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BREAK_IF_MATCH is a block of code which compares `struct STRUCTURE *result'
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to the lookup key arguments and does `break;' if they match. */
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#define DB_LOOKUP(name, break_if_match, proto...) \
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enum nss_status \
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_nss_files_get##name##_r (proto, \
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struct STRUCTURE *result, \
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char *buffer, int buflen H_ERRNO_PROTO) \
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{ \
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enum nss_status status; \
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\
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__libc_lock_lock (lock); \
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\
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/* Reset file pointer to beginning or open file. */ \
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internal_setent (keep_stream); \
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\
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while ((status = internal_getent (result, buffer, buflen H_ERRNO_ARG)) \
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== NSS_STATUS_SUCCESS) \
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{ break_if_match } \
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\
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if (! keep_stream) \
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internal_endent (); \
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\
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__libc_lock_unlock (lock); \
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\
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return status; \
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}
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