/* Copyright (C) 1996, 2001, 2004, 2006 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 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <ctype.h> #include <stdio.h> #include <stdio_ext.h> #include <stdlib.h> #include <string.h> #include <bits/libc-lock.h> #include <libnsl.h> /* Path of the file. */ static const char default_nss[] = "/etc/default/nss"; /* Flags once read from the file. */ static int default_nss_flags; /* Code to make sure we call 'init' once. */ __libc_once_define (static, once); /* Table of the recognized variables. */ static const struct { char name[23]; unsigned int len; int flag; } vars[] = { #define STRNLEN(s) s, sizeof (s) - 1 { STRNLEN ("NETID_AUTHORITATIVE"), NSS_FLAG_NETID_AUTHORITATIVE }, { STRNLEN ("SERVICES_AUTHORITATIVE"), NSS_FLAG_SERVICES_AUTHORITATIVE }, { STRNLEN ("SETENT_BATCH_READ"), NSS_FLAG_SETENT_BATCH_READ } }; #define nvars (sizeof (vars) / sizeof (vars[0])) static void init (void) { FILE *fp = fopen (default_nss, "rc"); if (fp != NULL) { char *line = NULL; size_t linelen = 0; __fsetlocking (fp, FSETLOCKING_BYCALLER); while (!feof_unlocked (fp)) { ssize_t n = getline (&line, &linelen, fp); if (n <= 0) break; /* Recognize only <THE-VARIABLE> = TRUE with arbitrary white spaces. */ char *cp = line; while (isspace (*cp)) ++cp; /* Recognize comment lines. */ if (*cp == '#') continue; int idx; for (idx = 0; idx < nvars; ++idx) if (strncmp (cp, vars[idx].name, vars[idx].len) == 0) break; if (idx == nvars) continue; cp += vars[idx].len; while (isspace (*cp)) ++cp; if (*cp++ != '=') continue; while (isspace (*cp)) ++cp; if (strncmp (cp, "TRUE", 4) != 0) continue; cp += 4; while (isspace (*cp)) ++cp; if (*cp == '\0') default_nss_flags |= vars[idx].flag; } free (line); fclose (fp); } } int _nsl_default_nss (void) { /* If we have not yet read the file yet do it now. */ __libc_once (once, init); return default_nss_flags; }