/* Copyright (C) 1993, 1995-2003, 2004 Free Software Foundation, Inc.
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/* Copyright (C) 1993, 1995-2003, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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This file is part of the GNU C Library.
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Contributed by David Mosberger (davidm@azstarnet.com).
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Contributed by David Mosberger (davidm@azstarnet.com).
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|
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The GNU C Library is free software; you can redistribute it and/or
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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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modify it under the terms of the GNU Lesser General Public
|
License as published by the Free Software Foundation; either
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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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version 2.1 of the License, or (at your option) any later version.
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|
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The GNU C Library is distributed in the hope that it will be useful,
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The GNU C Library is distributed in the hope that it will be useful,
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
Lesser General Public License for more details.
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Lesser General Public License for more details.
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|
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You should have received a copy of the GNU Lesser General Public
|
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
|
License along with the GNU C Library; if not, write to the Free
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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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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02111-1307 USA. */
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|
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/* This file provides a Linux /etc/host.conf compatible front end to
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/* This file provides a Linux /etc/host.conf compatible front end to
|
the various name resolvers (/etc/hosts, named, NIS server, etc.).
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the various name resolvers (/etc/hosts, named, NIS server, etc.).
|
Though mostly compatibly, the following differences exist compared
|
Though mostly compatibly, the following differences exist compared
|
to the original implementation:
|
to the original implementation:
|
|
|
- new command "spoof" takes an arguments like RESOLV_SPOOF_CHECK
|
- new command "spoof" takes an arguments like RESOLV_SPOOF_CHECK
|
environment variable (i.e., `off', `nowarn', or `warn').
|
environment variable (i.e., `off', `nowarn', or `warn').
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|
|
- line comments can appear anywhere (not just at the beginning of
|
- line comments can appear anywhere (not just at the beginning of
|
a line)
|
a line)
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*/
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*/
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|
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#include <assert.h>
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#include <assert.h>
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#include <errno.h>
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#include <errno.h>
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#include <ctype.h>
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#include <ctype.h>
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#include <libintl.h>
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#include <libintl.h>
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#include <memory.h>
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#include <memory.h>
|
#include <stdio.h>
|
#include <stdio.h>
|
#include <stdio_ext.h>
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#include <stdio_ext.h>
|
#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <net/if.h>
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#include <net/if.h>
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#include <sys/ioctl.h>
|
#include <sys/ioctl.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <netinet/in.h>
|
#include <netinet/in.h>
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#define _IO_MTSAFE_IO
|
#define _IO_MTSAFE_IO
|
#include <bits/libc-lock.h>
|
#include <bits/libc-lock.h>
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#include "ifreq.h"
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#include "ifreq.h"
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#include "res_hconf.h"
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#include "res_hconf.h"
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#include "local.h"
|
#include "local.h"
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#ifdef USE_IN_LIBIO
|
#ifdef USE_IN_LIBIO
|
# include <wchar.h>
|
# include <wchar.h>
|
#endif
|
#endif
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|
|
#define _PATH_HOSTCONF "/etc/host.conf"
|
#define _PATH_HOSTCONF "/etc/host.conf"
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|
|
/* Environment vars that all user to override default behavior: */
|
/* Environment vars that all user to override default behavior: */
|
#define ENV_HOSTCONF "RESOLV_HOST_CONF"
|
#define ENV_HOSTCONF "RESOLV_HOST_CONF"
|
#define ENV_SERVORDER "RESOLV_SERV_ORDER"
|
#define ENV_SERVORDER "RESOLV_SERV_ORDER"
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#define ENV_SPOOF "RESOLV_SPOOF_CHECK"
|
#define ENV_SPOOF "RESOLV_SPOOF_CHECK"
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#define ENV_TRIM_OVERR "RESOLV_OVERRIDE_TRIM_DOMAINS"
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#define ENV_TRIM_OVERR "RESOLV_OVERRIDE_TRIM_DOMAINS"
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#define ENV_TRIM_ADD "RESOLV_ADD_TRIM_DOMAINS"
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#define ENV_TRIM_ADD "RESOLV_ADD_TRIM_DOMAINS"
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#define ENV_MULTI "RESOLV_MULTI"
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#define ENV_MULTI "RESOLV_MULTI"
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#define ENV_REORDER "RESOLV_REORDER"
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#define ENV_REORDER "RESOLV_REORDER"
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|
|
static const char *arg_service_list (const char *, int, const char *,
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static const char *arg_service_list (const char *, int, const char *,
|
unsigned int);
|
unsigned int);
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static const char *arg_trimdomain_list (const char *, int, const char *,
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static const char *arg_trimdomain_list (const char *, int, const char *,
|
unsigned int);
|
unsigned int);
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static const char *arg_spoof (const char *, int, const char *, unsigned int);
|
static const char *arg_spoof (const char *, int, const char *, unsigned int);
|
static const char *arg_bool (const char *, int, const char *, unsigned int);
|
static const char *arg_bool (const char *, int, const char *, unsigned int);
|
|
|
static struct cmd
|
static struct cmd
|
{
|
{
|
const char *name;
|
const char *name;
|
const char *(*parse_args) (const char * filename, int line_num,
|
const char *(*parse_args) (const char * filename, int line_num,
|
const char * args, unsigned int arg);
|
const char * args, unsigned int arg);
|
unsigned int arg;
|
unsigned int arg;
|
} cmd[] =
|
} cmd[] =
|
{
|
{
|
{"order", arg_service_list, 0},
|
{"order", arg_service_list, 0},
|
{"trim", arg_trimdomain_list, 0},
|
{"trim", arg_trimdomain_list, 0},
|
{"spoof", arg_spoof, 0},
|
{"spoof", arg_spoof, 0},
|
{"multi", arg_bool, HCONF_FLAG_MULTI},
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{"multi", arg_bool, HCONF_FLAG_MULTI},
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{"nospoof", arg_bool, HCONF_FLAG_SPOOF},
|
{"nospoof", arg_bool, HCONF_FLAG_SPOOF},
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{"spoofalert", arg_bool, HCONF_FLAG_SPOOFALERT},
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{"spoofalert", arg_bool, HCONF_FLAG_SPOOFALERT},
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{"reorder", arg_bool, HCONF_FLAG_REORDER}
|
{"reorder", arg_bool, HCONF_FLAG_REORDER}
|
};
|
};
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|
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/* Structure containing the state. */
|
/* Structure containing the state. */
|
struct hconf _res_hconf;
|
struct hconf _res_hconf;
|
|
|
/* Skip white space. */
|
/* Skip white space. */
|
static const char *
|
static const char *
|
skip_ws (const char *str)
|
skip_ws (const char *str)
|
{
|
{
|
while (isspace (*str)) ++str;
|
while (isspace (*str)) ++str;
|
return str;
|
return str;
|
}
|
}
|
|
|
|
|
/* Skip until whitespace, comma, end of line, or comment character. */
|
/* Skip until whitespace, comma, end of line, or comment character. */
|
static const char *
|
static const char *
|
skip_string (const char *str)
|
skip_string (const char *str)
|
{
|
{
|
while (*str && !isspace (*str) && *str != '#' && *str != ',')
|
while (*str && !isspace (*str) && *str != '#' && *str != ',')
|
++str;
|
++str;
|
return str;
|
return str;
|
}
|
}
|
|
|
|
|
static const char *
|
static const char *
|
arg_service_list (const char *fname, int line_num, const char *args,
|
arg_service_list (const char *fname, int line_num, const char *args,
|
unsigned int arg)
|
unsigned int arg)
|
{
|
{
|
enum Name_Service service;
|
enum Name_Service service;
|
const char *start;
|
const char *start;
|
size_t len;
|
size_t len;
|
size_t i;
|
size_t i;
|
static struct
|
static struct
|
{
|
{
|
const char * name;
|
const char * name;
|
enum Name_Service service;
|
enum Name_Service service;
|
} svcs[] =
|
} svcs[] =
|
{
|
{
|
{"bind", SERVICE_BIND},
|
{"bind", SERVICE_BIND},
|
{"hosts", SERVICE_HOSTS},
|
{"hosts", SERVICE_HOSTS},
|
{"nis", SERVICE_NIS},
|
{"nis", SERVICE_NIS},
|
};
|
};
|
|
|
do
|
do
|
{
|
{
|
start = args;
|
start = args;
|
args = skip_string (args);
|
args = skip_string (args);
|
len = args - start;
|
len = args - start;
|
|
|
service = SERVICE_NONE;
|
service = SERVICE_NONE;
|
for (i = 0; i < sizeof (svcs) / sizeof (svcs[0]); ++i)
|
for (i = 0; i < sizeof (svcs) / sizeof (svcs[0]); ++i)
|
{
|
{
|
if (strncasecmp (start, svcs[i].name, len) == 0
|
if (strncasecmp (start, svcs[i].name, len) == 0
|
&& len == strlen (svcs[i].name))
|
&& len == strlen (svcs[i].name))
|
{
|
{
|
service = svcs[i].service;
|
service = svcs[i].service;
|
break;
|
break;
|
}
|
}
|
}
|
}
|
if (service == SERVICE_NONE)
|
if (service == SERVICE_NONE)
|
{
|
{
|
char *buf;
|
char *buf;
|
|
|
if (asprintf (&buf,
|
if (asprintf (&buf,
|
_("%s: line %d: expected service, found `%s'\n"),
|
_("%s: line %d: expected service, found `%s'\n"),
|
fname, line_num, start) < 0)
|
fname, line_num, start) < 0)
|
return 0;
|
return 0;
|
|
|
#ifdef USE_IN_LIBIO
|
#ifdef USE_IN_LIBIO
|
if (_IO_fwide (stderr, 0) > 0)
|
if (_IO_fwide (stderr, 0) > 0)
|
__fwprintf (stderr, L"%s", buf);
|
__fwprintf (stderr, L"%s", buf);
|
else
|
else
|
#endif
|
#endif
|
fputs (buf, stderr);
|
fputs (buf, stderr);
|
|
|
free (buf);
|
free (buf);
|
return 0;
|
return 0;
|
}
|
}
|
if (_res_hconf.num_services >= SERVICE_MAX)
|
if (_res_hconf.num_services >= SERVICE_MAX)
|
{
|
{
|
char *buf;
|
char *buf;
|
|
|
if (asprintf (&buf, _("\
|
if (asprintf (&buf, _("\
|
%s: line %d: cannot specify more than %d services"),
|
%s: line %d: cannot specify more than %d services"),
|
fname, line_num, SERVICE_MAX) < 0)
|
fname, line_num, SERVICE_MAX) < 0)
|
return 0;
|
return 0;
|
|
|
#ifdef USE_IN_LIBIO
|
#ifdef USE_IN_LIBIO
|
if (_IO_fwide (stderr, 0) > 0)
|
if (_IO_fwide (stderr, 0) > 0)
|
__fwprintf (stderr, L"%s", buf);
|
__fwprintf (stderr, L"%s", buf);
|
else
|
else
|
#endif
|
#endif
|
fputs (buf, stderr);
|
fputs (buf, stderr);
|
|
|
free (buf);
|
free (buf);
|
return 0;
|
return 0;
|
}
|
}
|
_res_hconf.service[_res_hconf.num_services++] = service;
|
_res_hconf.service[_res_hconf.num_services++] = service;
|
|
|
args = skip_ws (args);
|
args = skip_ws (args);
|
switch (*args)
|
switch (*args)
|
{
|
{
|
case ',':
|
case ',':
|
case ';':
|
case ';':
|
case ':':
|
case ':':
|
args = skip_ws (++args);
|
args = skip_ws (++args);
|
if (!*args || *args == '#')
|
if (!*args || *args == '#')
|
{
|
{
|
char *buf;
|
char *buf;
|
|
|
if (asprintf (&buf, _("\
|
if (asprintf (&buf, _("\
|
%s: line %d: list delimiter not followed by keyword"),
|
%s: line %d: list delimiter not followed by keyword"),
|
fname, line_num) < 0)
|
fname, line_num) < 0)
|
return 0;
|
return 0;
|
|
|
#ifdef USE_IN_LIBIO
|
#ifdef USE_IN_LIBIO
|
if (_IO_fwide (stderr, 0) > 0)
|
if (_IO_fwide (stderr, 0) > 0)
|
__fwprintf (stderr, L"%s", buf);
|
__fwprintf (stderr, L"%s", buf);
|
else
|
else
|
#endif
|
#endif
|
fputs (buf, stderr);
|
fputs (buf, stderr);
|
|
|
free (buf);
|
free (buf);
|
return 0;
|
return 0;
|
}
|
}
|
default:
|
default:
|
break;
|
break;
|
}
|
}
|
}
|
}
|
while (*args && *args != '#');
|
while (*args && *args != '#');
|
return args;
|
return args;
|
}
|
}
|
|
|
|
|
static const char *
|
static const char *
|
arg_trimdomain_list (const char *fname, int line_num, const char *args,
|
arg_trimdomain_list (const char *fname, int line_num, const char *args,
|
unsigned int flag)
|
unsigned int flag)
|
{
|
{
|
const char * start;
|
const char * start;
|
size_t len;
|
size_t len;
|
|
|
do
|
do
|
{
|
{
|
start = args;
|
start = args;
|
args = skip_string (args);
|
args = skip_string (args);
|
len = args - start;
|
len = args - start;
|
|
|
if (_res_hconf.num_trimdomains >= TRIMDOMAINS_MAX)
|
if (_res_hconf.num_trimdomains >= TRIMDOMAINS_MAX)
|
{
|
{
|
char *buf;
|
char *buf;
|
|
|
if (asprintf (&buf, _("\
|
if (asprintf (&buf, _("\
|
%s: line %d: cannot specify more than %d trim domains"),
|
%s: line %d: cannot specify more than %d trim domains"),
|
fname, line_num, TRIMDOMAINS_MAX) < 0)
|
fname, line_num, TRIMDOMAINS_MAX) < 0)
|
return 0;
|
return 0;
|
|
|
#ifdef USE_IN_LIBIO
|
#ifdef USE_IN_LIBIO
|
if (_IO_fwide (stderr, 0) > 0)
|
if (_IO_fwide (stderr, 0) > 0)
|
__fwprintf (stderr, L"%s", buf);
|
__fwprintf (stderr, L"%s", buf);
|
else
|
else
|
#endif
|
#endif
|
fputs (buf, stderr);
|
fputs (buf, stderr);
|
|
|
free (buf);
|
free (buf);
|
return 0;
|
return 0;
|
}
|
}
|
_res_hconf.trimdomain[_res_hconf.num_trimdomains++] =
|
_res_hconf.trimdomain[_res_hconf.num_trimdomains++] =
|
strndup (start, len);
|
strndup (start, len);
|
args = skip_ws (args);
|
args = skip_ws (args);
|
switch (*args)
|
switch (*args)
|
{
|
{
|
case ',': case ';': case ':':
|
case ',': case ';': case ':':
|
args = skip_ws (++args);
|
args = skip_ws (++args);
|
if (!*args || *args == '#')
|
if (!*args || *args == '#')
|
{
|
{
|
char *buf;
|
char *buf;
|
|
|
if (asprintf (&buf, _("\
|
if (asprintf (&buf, _("\
|
%s: line %d: list delimiter not followed by domain"),
|
%s: line %d: list delimiter not followed by domain"),
|
fname, line_num) < 0)
|
fname, line_num) < 0)
|
return 0;
|
return 0;
|
|
|
#ifdef USE_IN_LIBIO
|
#ifdef USE_IN_LIBIO
|
if (_IO_fwide (stderr, 0) > 0)
|
if (_IO_fwide (stderr, 0) > 0)
|
__fwprintf (stderr, L"%s", buf);
|
__fwprintf (stderr, L"%s", buf);
|
else
|
else
|
#endif
|
#endif
|
fputs (buf, stderr);
|
fputs (buf, stderr);
|
|
|
free (buf);
|
free (buf);
|
return 0;
|
return 0;
|
}
|
}
|
default:
|
default:
|
break;
|
break;
|
}
|
}
|
}
|
}
|
while (*args && *args != '#');
|
while (*args && *args != '#');
|
return args;
|
return args;
|
}
|
}
|
|
|
|
|
static const char *
|
static const char *
|
arg_spoof (const char *fname, int line_num, const char *args, unsigned flag)
|
arg_spoof (const char *fname, int line_num, const char *args, unsigned flag)
|
{
|
{
|
const char *start = args;
|
const char *start = args;
|
size_t len;
|
size_t len;
|
|
|
args = skip_string (args);
|
args = skip_string (args);
|
len = args - start;
|
len = args - start;
|
|
|
if (len == 3 && strncasecmp (start, "off", len) == 0)
|
if (len == 3 && strncasecmp (start, "off", len) == 0)
|
_res_hconf.flags &= ~(HCONF_FLAG_SPOOF | HCONF_FLAG_SPOOFALERT);
|
_res_hconf.flags &= ~(HCONF_FLAG_SPOOF | HCONF_FLAG_SPOOFALERT);
|
else
|
else
|
{
|
{
|
_res_hconf.flags |= (HCONF_FLAG_SPOOF | HCONF_FLAG_SPOOFALERT);
|
_res_hconf.flags |= (HCONF_FLAG_SPOOF | HCONF_FLAG_SPOOFALERT);
|
if ((len == 6 && strncasecmp (start, "nowarn", len) == 0)
|
if ((len == 6 && strncasecmp (start, "nowarn", len) == 0)
|
|| !(len == 4 && strncasecmp (start, "warn", len) == 0))
|
|| !(len == 4 && strncasecmp (start, "warn", len) == 0))
|
_res_hconf.flags &= ~HCONF_FLAG_SPOOFALERT;
|
_res_hconf.flags &= ~HCONF_FLAG_SPOOFALERT;
|
}
|
}
|
return args;
|
return args;
|
}
|
}
|
|
|
|
|
static const char *
|
static const char *
|
arg_bool (const char *fname, int line_num, const char *args, unsigned flag)
|
arg_bool (const char *fname, int line_num, const char *args, unsigned flag)
|
{
|
{
|
if (strncasecmp (args, "on", 2) == 0)
|
if (strncasecmp (args, "on", 2) == 0)
|
{
|
{
|
args += 2;
|
args += 2;
|
_res_hconf.flags |= flag;
|
_res_hconf.flags |= flag;
|
}
|
}
|
else if (strncasecmp (args, "off", 3) == 0)
|
else if (strncasecmp (args, "off", 3) == 0)
|
{
|
{
|
args += 3;
|
args += 3;
|
_res_hconf.flags &= ~flag;
|
_res_hconf.flags &= ~flag;
|
}
|
}
|
else
|
else
|
{
|
{
|
char *buf;
|
char *buf;
|
|
|
if (asprintf (&buf,
|
if (asprintf (&buf,
|
_("%s: line %d: expected `on' or `off', found `%s'\n"),
|
_("%s: line %d: expected `on' or `off', found `%s'\n"),
|
fname, line_num, args) < 0)
|
fname, line_num, args) < 0)
|
return 0;
|
return 0;
|
|
|
#ifdef USE_IN_LIBIO
|
#ifdef USE_IN_LIBIO
|
if (_IO_fwide (stderr, 0) > 0)
|
if (_IO_fwide (stderr, 0) > 0)
|
__fwprintf (stderr, L"%s", buf);
|
__fwprintf (stderr, L"%s", buf);
|
else
|
else
|
#endif
|
#endif
|
fputs (buf, stderr);
|
fputs (buf, stderr);
|
|
|
free (buf);
|
free (buf);
|
return 0;
|
return 0;
|
}
|
}
|
return args;
|
return args;
|
}
|
}
|
|
|
|
|
static void
|
static void
|
parse_line (const char *fname, int line_num, const char *str)
|
parse_line (const char *fname, int line_num, const char *str)
|
{
|
{
|
const char *start;
|
const char *start;
|
struct cmd *c = 0;
|
struct cmd *c = 0;
|
size_t len;
|
size_t len;
|
size_t i;
|
size_t i;
|
|
|
str = skip_ws (str);
|
str = skip_ws (str);
|
|
|
/* skip line comment and empty lines: */
|
/* skip line comment and empty lines: */
|
if (*str == '\0' || *str == '#') return;
|
if (*str == '\0' || *str == '#') return;
|
|
|
start = str;
|
start = str;
|
str = skip_string (str);
|
str = skip_string (str);
|
len = str - start;
|
len = str - start;
|
|
|
for (i = 0; i < sizeof (cmd) / sizeof (cmd[0]); ++i)
|
for (i = 0; i < sizeof (cmd) / sizeof (cmd[0]); ++i)
|
{
|
{
|
if (strncasecmp (start, cmd[i].name, len) == 0
|
if (strncasecmp (start, cmd[i].name, len) == 0
|
&& strlen (cmd[i].name) == len)
|
&& strlen (cmd[i].name) == len)
|
{
|
{
|
c = &cmd[i];
|
c = &cmd[i];
|
break;
|
break;
|
}
|
}
|
}
|
}
|
if (c == NULL)
|
if (c == NULL)
|
{
|
{
|
char *buf;
|
char *buf;
|
|
|
if (asprintf (&buf, _("%s: line %d: bad command `%s'\n"),
|
if (asprintf (&buf, _("%s: line %d: bad command `%s'\n"),
|
fname, line_num, start) < 0)
|
fname, line_num, start) < 0)
|
return;
|
return;
|
|
|
#ifdef USE_IN_LIBIO
|
#ifdef USE_IN_LIBIO
|
if (_IO_fwide (stderr, 0) > 0)
|
if (_IO_fwide (stderr, 0) > 0)
|
__fwprintf (stderr, L"%s", buf);
|
__fwprintf (stderr, L"%s", buf);
|
else
|
else
|
#endif
|
#endif
|
fputs (buf, stderr);
|
fputs (buf, stderr);
|
|
|
free (buf);
|
free (buf);
|
return;
|
return;
|
}
|
}
|
|
|
/* process args: */
|
/* process args: */
|
str = skip_ws (str);
|
str = skip_ws (str);
|
str = (*c->parse_args) (fname, line_num, str, c->arg);
|
str = (*c->parse_args) (fname, line_num, str, c->arg);
|
if (!str)
|
if (!str)
|
return;
|
return;
|
|
|
/* rest of line must contain white space or comment only: */
|
/* rest of line must contain white space or comment only: */
|
while (*str)
|
while (*str)
|
{
|
{
|
if (!isspace (*str)) {
|
if (!isspace (*str)) {
|
if (*str != '#')
|
if (*str != '#')
|
{
|
{
|
char *buf;
|
char *buf;
|
|
|
if (asprintf (&buf,
|
if (asprintf (&buf,
|
_("%s: line %d: ignoring trailing garbage `%s'\n"),
|
_("%s: line %d: ignoring trailing garbage `%s'\n"),
|
fname, line_num, str) < 0)
|
fname, line_num, str) < 0)
|
break;
|
break;
|
|
|
#ifdef USE_IN_LIBIO
|
#ifdef USE_IN_LIBIO
|
if (_IO_fwide (stderr, 0) > 0)
|
if (_IO_fwide (stderr, 0) > 0)
|
__fwprintf (stderr, L"%s", buf);
|
__fwprintf (stderr, L"%s", buf);
|
else
|
else
|
#endif
|
#endif
|
fputs (buf, stderr);
|
fputs (buf, stderr);
|
|
|
free (buf);
|
free (buf);
|
}
|
}
|
break;
|
break;
|
}
|
}
|
++str;
|
++str;
|
}
|
}
|
}
|
}
|
|
|
|
|
static void
|
static void
|
do_init (void)
|
do_init (void)
|
{
|
{
|
const char *hconf_name;
|
const char *hconf_name;
|
int line_num = 0;
|
int line_num = 0;
|
char buf[256], *envval;
|
char buf[256], *envval;
|
FILE *fp;
|
FILE *fp;
|
|
|
memset (&_res_hconf, '\0', sizeof (_res_hconf));
|
memset (&_res_hconf, '\0', sizeof (_res_hconf));
|
|
|
hconf_name = getenv (ENV_HOSTCONF);
|
hconf_name = getenv (ENV_HOSTCONF);
|
if (hconf_name == NULL)
|
if (hconf_name == NULL)
|
hconf_name = _PATH_HOSTCONF;
|
hconf_name = _PATH_HOSTCONF;
|
|
|
fp = fopen (hconf_name, "rc");
|
fp = fopen (hconf_name, "rc");
|
if (!fp)
|
if (!fp)
|
/* make up something reasonable: */
|
/* make up something reasonable: */
|
_res_hconf.service[_res_hconf.num_services++] = SERVICE_BIND;
|
_res_hconf.service[_res_hconf.num_services++] = SERVICE_BIND;
|
else
|
else
|
{
|
{
|
/* No threads using this stream. */
|
/* No threads using this stream. */
|
__fsetlocking (fp, FSETLOCKING_BYCALLER);
|
__fsetlocking (fp, FSETLOCKING_BYCALLER);
|
|
|
while (fgets (buf, sizeof (buf), fp))
|
while (fgets (buf, sizeof (buf), fp))
|
{
|
{
|
char *tmp;
|
char *tmp;
|
++line_num;
|
++line_num;
|
tmp = strchr (buf, '\n');
|
tmp = strchr (buf, '\n');
|
if (tmp != NULL)
|
if (tmp != NULL)
|
*tmp = '\0';
|
*tmp = '\0';
|
parse_line (hconf_name, line_num, buf);
|
parse_line (hconf_name, line_num, buf);
|
}
|
}
|
fclose (fp);
|
fclose (fp);
|
}
|
}
|
|
|
envval = getenv (ENV_SERVORDER);
|
envval = getenv (ENV_SERVORDER);
|
if (envval)
|
if (envval)
|
{
|
{
|
_res_hconf.num_services = 0;
|
_res_hconf.num_services = 0;
|
arg_service_list (ENV_SERVORDER, 1, envval, 0);
|
arg_service_list (ENV_SERVORDER, 1, envval, 0);
|
}
|
}
|
|
|
envval = getenv (ENV_SPOOF);
|
envval = getenv (ENV_SPOOF);
|
if (envval)
|
if (envval)
|
arg_spoof (ENV_SPOOF, 1, envval, 0);
|
arg_spoof (ENV_SPOOF, 1, envval, 0);
|
|
|
envval = getenv (ENV_MULTI);
|
envval = getenv (ENV_MULTI);
|
if (envval)
|
if (envval)
|
arg_bool (ENV_MULTI, 1, envval, HCONF_FLAG_MULTI);
|
arg_bool (ENV_MULTI, 1, envval, HCONF_FLAG_MULTI);
|
|
|
envval = getenv (ENV_REORDER);
|
envval = getenv (ENV_REORDER);
|
if (envval)
|
if (envval)
|
arg_bool (ENV_REORDER, 1, envval, HCONF_FLAG_REORDER);
|
arg_bool (ENV_REORDER, 1, envval, HCONF_FLAG_REORDER);
|
|
|
envval = getenv (ENV_TRIM_ADD);
|
envval = getenv (ENV_TRIM_ADD);
|
if (envval)
|
if (envval)
|
arg_trimdomain_list (ENV_TRIM_ADD, 1, envval, 0);
|
arg_trimdomain_list (ENV_TRIM_ADD, 1, envval, 0);
|
|
|
envval = getenv (ENV_TRIM_OVERR);
|
envval = getenv (ENV_TRIM_OVERR);
|
if (envval)
|
if (envval)
|
{
|
{
|
_res_hconf.num_trimdomains = 0;
|
_res_hconf.num_trimdomains = 0;
|
arg_trimdomain_list (ENV_TRIM_OVERR, 1, envval, 0);
|
arg_trimdomain_list (ENV_TRIM_OVERR, 1, envval, 0);
|
}
|
}
|
|
|
_res_hconf.initialized = 1;
|
_res_hconf.initialized = 1;
|
}
|
}
|
|
|
|
|
/* Initialize hconf datastructure by reading host.conf file and
|
/* Initialize hconf datastructure by reading host.conf file and
|
environment variables. */
|
environment variables. */
|
void
|
void
|
_res_hconf_init (void)
|
_res_hconf_init (void)
|
{
|
{
|
__libc_once_define (static, once);
|
__libc_once_define (static, once);
|
|
|
__libc_once (once, do_init);
|
__libc_once (once, do_init);
|
}
|
}
|
|
|
|
|
/* List of known interfaces. */
|
/* List of known interfaces. */
|
libc_freeres_ptr (
|
libc_freeres_ptr (
|
static struct netaddr
|
static struct netaddr
|
{
|
{
|
int addrtype;
|
int addrtype;
|
union
|
union
|
{
|
{
|
struct
|
struct
|
{
|
{
|
u_int32_t addr;
|
u_int32_t addr;
|
u_int32_t mask;
|
u_int32_t mask;
|
} ipv4;
|
} ipv4;
|
} u;
|
} u;
|
} *ifaddrs);
|
} *ifaddrs);
|
|
|
/* We need to protect the dynamic buffer handling. */
|
/* We need to protect the dynamic buffer handling. */
|
__libc_lock_define_initialized (static, lock);
|
__libc_lock_define_initialized (static, lock);
|
|
|
/* Reorder addresses returned in a hostent such that the first address
|
/* Reorder addresses returned in a hostent such that the first address
|
is an address on the local subnet, if there is such an address.
|
is an address on the local subnet, if there is such an address.
|
Otherwise, nothing is changed.
|
Otherwise, nothing is changed.
|
|
|
Note that this function currently only handles IPv4 addresses. */
|
Note that this function currently only handles IPv4 addresses. */
|
|
|
void
|
void
|
_res_hconf_reorder_addrs (struct hostent *hp)
|
_res_hconf_reorder_addrs (struct hostent *hp)
|
{
|
{
|
#if defined SIOCGIFCONF && defined SIOCGIFNETMASK
|
#if defined SIOCGIFCONF && defined SIOCGIFNETMASK
|
int i, j;
|
int i, j;
|
/* Number of interfaces. */
|
/* Number of interfaces. */
|
static int num_ifs = -1;
|
static int num_ifs = -1;
|
|
|
/* Only reorder if we're supposed to. */
|
/* Only reorder if we're supposed to. */
|
if ((_res_hconf.flags & HCONF_FLAG_REORDER) == 0)
|
if ((_res_hconf.flags & HCONF_FLAG_REORDER) == 0)
|
return;
|
return;
|
|
|
/* Can't deal with anything but IPv4 for now... */
|
/* Can't deal with anything but IPv4 for now... */
|
if (hp->h_addrtype != AF_INET)
|
if (hp->h_addrtype != AF_INET)
|
return;
|
return;
|
|
|
if (num_ifs <= 0)
|
if (num_ifs <= 0)
|
{
|
{
|
struct ifreq *ifr, *cur_ifr;
|
struct ifreq *ifr, *cur_ifr;
|
int sd, num, i;
|
int sd, num, i;
|
/* Save errno. */
|
/* Save errno. */
|
int save = errno;
|
int save = errno;
|
|
|
/* Initialize interface table. */
|
/* Initialize interface table. */
|
|
|
num_ifs = 0;
|
num_ifs = 0;
|
|
|
/* The SIOCGIFNETMASK ioctl will only work on an AF_INET socket. */
|
/* The SIOCGIFNETMASK ioctl will only work on an AF_INET socket. */
|
sd = socket (AF_INET, SOCK_DGRAM, 0);
|
sd = socket (AF_INET, SOCK_DGRAM, 0);
|
if (sd < 0)
|
if (sd < 0)
|
return;
|
return;
|
|
|
/* Get lock. */
|
/* Get lock. */
|
__libc_lock_lock (lock);
|
__libc_lock_lock (lock);
|
|
|
/* Get a list of interfaces. */
|
/* Get a list of interfaces. */
|
__ifreq (&ifr, &num, sd);
|
__ifreq (&ifr, &num, sd);
|
if (!ifr)
|
if (!ifr)
|
goto cleanup;
|
goto cleanup;
|
|
|
ifaddrs = malloc (num * sizeof (ifaddrs[0]));
|
ifaddrs = malloc (num * sizeof (ifaddrs[0]));
|
if (!ifaddrs)
|
if (!ifaddrs)
|
goto cleanup1;
|
goto cleanup1;
|
|
|
/* Copy usable interfaces in ifaddrs structure. */
|
/* Copy usable interfaces in ifaddrs structure. */
|
for (cur_ifr = ifr, i = 0; i < num; cur_ifr = __if_nextreq (cur_ifr), ++i)
|
for (cur_ifr = ifr, i = 0; i < num; cur_ifr = __if_nextreq (cur_ifr), ++i)
|
{
|
{
|
if (cur_ifr->ifr_addr.sa_family != AF_INET)
|
if (cur_ifr->ifr_addr.sa_family != AF_INET)
|
continue;
|
continue;
|
|
|
ifaddrs[num_ifs].addrtype = AF_INET;
|
ifaddrs[num_ifs].addrtype = AF_INET;
|
ifaddrs[num_ifs].u.ipv4.addr =
|
ifaddrs[num_ifs].u.ipv4.addr =
|
((struct sockaddr_in *) &cur_ifr->ifr_addr)->sin_addr.s_addr;
|
((struct sockaddr_in *) &cur_ifr->ifr_addr)->sin_addr.s_addr;
|
|
|
if (ioctl (sd, SIOCGIFNETMASK, cur_ifr) < 0)
|
if (ioctl (sd, SIOCGIFNETMASK, cur_ifr) < 0)
|
continue;
|
continue;
|
|
|
ifaddrs[num_ifs].u.ipv4.mask =
|
ifaddrs[num_ifs].u.ipv4.mask =
|
((struct sockaddr_in *) &cur_ifr->ifr_netmask)->sin_addr.s_addr;
|
((struct sockaddr_in *) &cur_ifr->ifr_netmask)->sin_addr.s_addr;
|
|
|
/* Now we're committed to this entry. */
|
/* Now we're committed to this entry. */
|
++num_ifs;
|
++num_ifs;
|
}
|
}
|
/* Just keep enough memory to hold all the interfaces we want. */
|
/* Just keep enough memory to hold all the interfaces we want. */
|
ifaddrs = realloc (ifaddrs, num_ifs * sizeof (ifaddrs[0]));
|
ifaddrs = realloc (ifaddrs, num_ifs * sizeof (ifaddrs[0]));
|
assert (ifaddrs != NULL);
|
assert (ifaddrs != NULL);
|
|
|
cleanup1:
|
cleanup1:
|
__if_freereq (ifr, num);
|
__if_freereq (ifr, num);
|
|
|
cleanup:
|
cleanup:
|
/* Release lock, preserve error value, and close socket. */
|
/* Release lock, preserve error value, and close socket. */
|
save = errno;
|
save = errno;
|
__libc_lock_unlock (lock);
|
__libc_lock_unlock (lock);
|
close (sd);
|
close (sd);
|
}
|
}
|
|
|
if (num_ifs == 0)
|
if (num_ifs == 0)
|
return;
|
return;
|
|
|
/* Find an address for which we have a direct connection. */
|
/* Find an address for which we have a direct connection. */
|
for (i = 0; hp->h_addr_list[i]; ++i)
|
for (i = 0; hp->h_addr_list[i]; ++i)
|
{
|
{
|
struct in_addr *haddr = (struct in_addr *) hp->h_addr_list[i];
|
struct in_addr *haddr = (struct in_addr *) hp->h_addr_list[i];
|
|
|
for (j = 0; j < num_ifs; ++j)
|
for (j = 0; j < num_ifs; ++j)
|
{
|
{
|
u_int32_t if_addr = ifaddrs[j].u.ipv4.addr;
|
u_int32_t if_addr = ifaddrs[j].u.ipv4.addr;
|
u_int32_t if_netmask = ifaddrs[j].u.ipv4.mask;
|
u_int32_t if_netmask = ifaddrs[j].u.ipv4.mask;
|
|
|
if (((haddr->s_addr ^ if_addr) & if_netmask) == 0)
|
if (((haddr->s_addr ^ if_addr) & if_netmask) == 0)
|
{
|
{
|
void *tmp;
|
void *tmp;
|
|
|
tmp = hp->h_addr_list[i];
|
tmp = hp->h_addr_list[i];
|
hp->h_addr_list[i] = hp->h_addr_list[0];
|
hp->h_addr_list[i] = hp->h_addr_list[0];
|
hp->h_addr_list[0] = tmp;
|
hp->h_addr_list[0] = tmp;
|
return;
|
return;
|
}
|
}
|
}
|
}
|
}
|
}
|
#endif /* defined(SIOCGIFCONF) && ... */
|
#endif /* defined(SIOCGIFCONF) && ... */
|
}
|
}
|
|
|
|
|
/* If HOSTNAME has a postfix matching any of the trimdomains, trim away
|
/* If HOSTNAME has a postfix matching any of the trimdomains, trim away
|
that postfix. Notice that HOSTNAME is modified inplace. Also, the
|
that postfix. Notice that HOSTNAME is modified inplace. Also, the
|
original code applied all trimdomains in order, meaning that the
|
original code applied all trimdomains in order, meaning that the
|
same domainname could be trimmed multiple times. I believe this
|
same domainname could be trimmed multiple times. I believe this
|
was unintentional. */
|
was unintentional. */
|
void
|
void
|
_res_hconf_trim_domain (char *hostname)
|
_res_hconf_trim_domain (char *hostname)
|
{
|
{
|
size_t hostname_len, trim_len;
|
size_t hostname_len, trim_len;
|
int i;
|
int i;
|
|
|
hostname_len = strlen (hostname);
|
hostname_len = strlen (hostname);
|
|
|
for (i = 0; i < _res_hconf.num_trimdomains; ++i)
|
for (i = 0; i < _res_hconf.num_trimdomains; ++i)
|
{
|
{
|
const char *trim = _res_hconf.trimdomain[i];
|
const char *trim = _res_hconf.trimdomain[i];
|
|
|
trim_len = strlen (trim);
|
trim_len = strlen (trim);
|
if (hostname_len > trim_len
|
if (hostname_len > trim_len
|
&& strcasecmp (&hostname[hostname_len - trim_len], trim) == 0)
|
&& strcasecmp (&hostname[hostname_len - trim_len], trim) == 0)
|
{
|
{
|
hostname[hostname_len - trim_len] = '\0';
|
hostname[hostname_len - trim_len] = '\0';
|
break;
|
break;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
|
|
/* Trim all hostnames/aliases in HP according to the trimdomain list.
|
/* Trim all hostnames/aliases in HP according to the trimdomain list.
|
Notice that HP is modified inplace! */
|
Notice that HP is modified inplace! */
|
void
|
void
|
_res_hconf_trim_domains (struct hostent *hp)
|
_res_hconf_trim_domains (struct hostent *hp)
|
{
|
{
|
int i;
|
int i;
|
|
|
if (_res_hconf.num_trimdomains == 0)
|
if (_res_hconf.num_trimdomains == 0)
|
return;
|
return;
|
|
|
_res_hconf_trim_domain (hp->h_name);
|
_res_hconf_trim_domain (hp->h_name);
|
for (i = 0; hp->h_aliases[i]; ++i)
|
for (i = 0; hp->h_aliases[i]; ++i)
|
_res_hconf_trim_domain (hp->h_aliases[i]);
|
_res_hconf_trim_domain (hp->h_aliases[i]);
|
}
|
}
|
|
|
