118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/* Copyright (C) 1996, 2001, 2004, 2006 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <ctype.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <string.h>
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#include <bits/libc-lock.h>
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#include <libnsl.h>
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/* Path of the file. */
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static const char default_nss[] = "/etc/default/nss";
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/* Flags once read from the file. */
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static int default_nss_flags;
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/* Code to make sure we call 'init' once. */
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__libc_once_define (static, once);
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static void
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init (void)
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{
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FILE *fp = fopen (default_nss, "rc");
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if (fp != NULL)
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{
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char *line = NULL;
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size_t linelen = 0;
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__fsetlocking (fp, FSETLOCKING_BYCALLER);
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while (!feof_unlocked (fp))
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{
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ssize_t n = getline (&line, &linelen, fp);
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if (n <= 0)
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break;
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/* There currently are only two variables we expect, so
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simplify the parsing. Recognize only
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NETID_AUTHORITATIVE = TRUE
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SERVICES_AUTHORITATIVE = TRUE
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with arbitrary white spaces. */
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char *cp = line;
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while (isspace (*cp))
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++cp;
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/* Recognize comment lines. */
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if (*cp == '#')
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continue;
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static const char netid_authoritative[] = "NETID_AUTHORITATIVE";
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static const char services_authoritative[]
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= "SERVICES_AUTHORITATIVE";
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size_t flag_len;
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if (strncmp (cp, netid_authoritative,
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flag_len = sizeof (netid_authoritative) - 1) != 0
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&& strncmp (cp, services_authoritative,
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flag_len = sizeof (services_authoritative) - 1)
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!= 0)
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continue;
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cp += flag_len;
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while (isspace (*cp))
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++cp;
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if (*cp++ != '=')
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continue;
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while (isspace (*cp))
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++cp;
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if (strncmp (cp, "TRUE", 4) != 0)
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continue;
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cp += 4;
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while (isspace (*cp))
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++cp;
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if (*cp == '\0')
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default_nss_flags |= (flag_len == sizeof (netid_authoritative) - 1
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? NSS_FLAG_NETID_AUTHORITATIVE
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: NSS_FLAG_SERVICES_AUTHORITATIVE);
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}
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free (line);
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fclose (fp);
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}
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}
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int
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_nsl_default_nss (void)
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{
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/* If we have not yet read the file yet do it now. */
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__libc_once (once, init);
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return default_nss_flags;
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}
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