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128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
/* Copyright (C) 1996-2017 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, see
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<http://www.gnu.org/licenses/>. */
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#include <ctype.h>
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#include <errno.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 <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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/* Table of the recognized variables. */
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static const struct
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{
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char name[23];
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unsigned int len;
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int flag;
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} vars[] =
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{
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#define STRNLEN(s) s, sizeof (s) - 1
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{ STRNLEN ("NETID_AUTHORITATIVE"), NSS_FLAG_NETID_AUTHORITATIVE },
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{ STRNLEN ("SERVICES_AUTHORITATIVE"), NSS_FLAG_SERVICES_AUTHORITATIVE },
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{ STRNLEN ("SETENT_BATCH_READ"), NSS_FLAG_SETENT_BATCH_READ },
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{ STRNLEN ("ADJUNCT_AS_SHADOW"), NSS_FLAG_ADJUNCT_AS_SHADOW },
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};
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#define nvars (sizeof (vars) / sizeof (vars[0]))
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static void
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init (void)
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{
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int saved_errno = errno;
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FILE *fp = fopen (default_nss, "rce");
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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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/* Recognize only
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<THE-VARIABLE> = 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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int idx;
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for (idx = 0; idx < nvars; ++idx)
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if (strncmp (cp, vars[idx].name, vars[idx].len) == 0)
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break;
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if (idx == nvars)
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continue;
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cp += vars[idx].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 |= vars[idx].flag;
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}
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free (line);
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fclose (fp);
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}
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__set_errno (saved_errno);
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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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