| c732d49e |
#if HAVE_CRT
#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>
#endif //HAVE_CRT
/* #line 1 "./ragel/tnet_dns_resolvconf.rl" */
/*
* Copyright (C) 2010-2015 Mamadou DIOP.
*
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* DOUBANGO 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with DOUBANGO.
*
*/
/**@file tnet_dns_resolvconf.c
* @brief Parser for "/etc/resolv.conf" file to retrive DNS servers.
*/
#include "tnet_dns_resolvconf.h"
#include "tnet_utils.h"
#include "dns/tnet_dns.h"
#include "tsk_string.h"
#include "tsk_memory.h"
#include "tsk_ragel_state.h"
#include "tsk_debug.h"
#include <string.h>
/* === Ragel state machine === */
/* #line 75 "./ragel/tnet_dns_resolvconf.rl" */
/** Gets list of DNS servers from a conf file.
* @param path Path of the conf file from which to retrieve the DNS servers.
* should be @a "/etc/resolv.conf". You can adjust the value by modifying @ref TNET_RESOLV_CONF_PATH.<br>
* If you are using <b>Android</b> and the resolv.conf file is missing, then run the following line in a command window: <br>
* <i>ln -s /private/var/run/resolv.conf /etc/resolv.conf</i><br> If this fails, then try to manually add the file.
* @retval List of DNS servers.
*/
tnet_addresses_L_t * tnet_dns_resolvconf_parse(const char* path)
{
tnet_addresses_L_t* servers = tsk_null;
tnet_ip_t ip;
const char* fullpath = path;
const char* tag_start = tsk_null;
FILE* fd;
char* buf = tsk_null;
// Ragel
int cs = 0;
const char *p;
const char *pe;
const char *eof;
TSK_RAGEL_DISABLE_WARNINGS_BEGIN()
/* #line 69 "./src/dns/tnet_dns_resolvconf.c" */
static const char _tdns_machine_resolvconf_actions[] = {
0, 1, 0, 1, 1
};
static const char _tdns_machine_resolvconf_key_offsets[] = {
0, 7, 8, 9, 12, 15, 15, 22,
24, 27, 30, 33, 36, 39, 42, 45,
48, 51, 52, 53, 56
};
static const char _tdns_machine_resolvconf_trans_keys[] = {
10, 13, 32, 35, 59, 78, 110, 32,
32, 10, 13, 32, 10, 13, 32, 10,
13, 32, 35, 59, 78, 110, 10, 13,
32, 65, 97, 32, 77, 109, 32, 69,
101, 32, 83, 115, 32, 69, 101, 32,
82, 114, 32, 86, 118, 32, 69, 101,
32, 82, 114, 32, 32, 10, 13, 32,
32, 35, 59, 78, 110, 0
};
static const char _tdns_machine_resolvconf_single_lengths[] = {
7, 1, 1, 3, 3, 0, 7, 2,
3, 3, 3, 3, 3, 3, 3, 3,
3, 1, 1, 3, 5
};
static const char _tdns_machine_resolvconf_range_lengths[] = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0
};
static const char _tdns_machine_resolvconf_index_offsets[] = {
0, 8, 10, 12, 16, 20, 21, 29,
32, 36, 40, 44, 48, 52, 56, 60,
64, 68, 70, 72, 76
};
static const char _tdns_machine_resolvconf_indicies[] = {
1, 1, 2, 3, 3, 4, 4, 0,
5, 0, 5, 6, 7, 7, 8, 6,
7, 7, 8, 9, 9, 1, 1, 5,
3, 3, 4, 4, 0, 7, 7, 3,
5, 10, 10, 0, 5, 11, 11, 0,
5, 12, 12, 0, 5, 13, 13, 0,
5, 14, 14, 0, 5, 15, 15, 0,
5, 16, 16, 0, 5, 17, 17, 0,
5, 18, 18, 0, 19, 0, 19, 20,
22, 22, 23, 21, 2, 3, 3, 4,
4, 0, 0
};
static const char _tdns_machine_resolvconf_trans_targs[] = {
1, 6, 20, 7, 8, 2, 3, 0,
4, 5, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 19, 0, 4
};
static const char _tdns_machine_resolvconf_trans_actions[] = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 1, 0, 3, 3
};
static const int tdns_machine_resolvconf_start = 0;
static const int tdns_machine_resolvconf_first_final = 0;
static const int tdns_machine_resolvconf_error = -1;
static const int tdns_machine_resolvconf_en_main = 0;
/* #line 101 "./ragel/tnet_dns_resolvconf.rl" */
TSK_RAGEL_DISABLE_WARNINGS_END()
(void)(eof);
(void)(tdns_machine_resolvconf_first_final);
(void)(tdns_machine_resolvconf_error);
(void)(tdns_machine_resolvconf_en_main);
if(tsk_strnullORempty(fullpath)){
fullpath = TNET_RESOLV_CONF_PATH;
}
/* Open the file and read all data */
if((fd = fopen(fullpath, "r"))){
long len;
fseek(fd, 0L, SEEK_END);
len = ftell(fd);
fseek(fd, 0L, SEEK_SET);
#if HAVE_CRT //Debug memory
if (!(buf = (char*)calloc(len + 1, 1))) {
#else
if (!(buf = (char*)tsk_calloc(len + 1, 1))) {
#endif //HAVE_CRT
TSK_DEBUG_ERROR("Failed to allocate buffer with size = %ld", (len + 1));
goto bail;
}
fread(buf, 1, len, fd);
p = &buf[0];
pe = p + len + 1/*hack*/;
eof = pe;
fclose(fd);
buf[len] = '\n'; // hack to have perfect lines
servers = tsk_list_create();
}
else {
#if ANDROID || defined(__APPLE__) /* TARGET_OS_IPHONE not defined for bsd libraries */
TSK_DEBUG_INFO("Failed to open [%s]. But don't panic, we have detected that you are using Google Android/iOS Systems.\n"
"You should look at the Progammer's Guide for more information.\n If you are not using DNS functions, don't worry about this warning.",
fullpath);
#else
TSK_DEBUG_ERROR("Failed to open %s.", fullpath);
#endif
goto bail;
}
TSK_RAGEL_DISABLE_WARNINGS_BEGIN()
/* #line 186 "./src/dns/tnet_dns_resolvconf.c" */
{
cs = tdns_machine_resolvconf_start;
}
/* #line 144 "./ragel/tnet_dns_resolvconf.rl" */
/* #line 193 "./src/dns/tnet_dns_resolvconf.c" */
{
int _klen;
unsigned int _trans;
const char *_acts;
unsigned int _nacts;
const char *_keys;
if ( p == pe )
goto _test_eof;
_resume:
_keys = _tdns_machine_resolvconf_trans_keys + _tdns_machine_resolvconf_key_offsets[cs];
_trans = _tdns_machine_resolvconf_index_offsets[cs];
_klen = _tdns_machine_resolvconf_single_lengths[cs];
if ( _klen > 0 ) {
const char *_lower = _keys;
const char *_mid;
const char *_upper = _keys + _klen - 1;
while (1) {
if ( _upper < _lower )
break;
_mid = _lower + ((_upper-_lower) >> 1);
if ( (*p) < *_mid )
_upper = _mid - 1;
else if ( (*p) > *_mid )
_lower = _mid + 1;
else {
_trans += (_mid - _keys);
goto _match;
}
}
_keys += _klen;
_trans += _klen;
}
_klen = _tdns_machine_resolvconf_range_lengths[cs];
if ( _klen > 0 ) {
const char *_lower = _keys;
const char *_mid;
const char *_upper = _keys + (_klen<<1) - 2;
while (1) {
if ( _upper < _lower )
break;
_mid = _lower + (((_upper-_lower) >> 1) & ~1);
if ( (*p) < _mid[0] )
_upper = _mid - 2;
else if ( (*p) > _mid[1] )
_lower = _mid + 2;
else {
_trans += ((_mid - _keys)>>1);
goto _match;
}
}
_trans += _klen;
}
_match:
_trans = _tdns_machine_resolvconf_indicies[_trans];
cs = _tdns_machine_resolvconf_trans_targs[_trans];
if ( _tdns_machine_resolvconf_trans_actions[_trans] == 0 )
goto _again;
_acts = _tdns_machine_resolvconf_actions + _tdns_machine_resolvconf_trans_actions[_trans];
_nacts = (unsigned int) *_acts++;
while ( _nacts-- > 0 )
{
switch ( *_acts++ )
{
case 0:
/* #line 41 "./ragel/tnet_dns_resolvconf.rl" */
{
tag_start = p;
}
break;
case 1:
/* #line 45 "./ragel/tnet_dns_resolvconf.rl" */
{
int len = (int)(p - tag_start);
if(len && len<=sizeof(ip)){
tnet_address_t *address;
memset(ip, '\0', sizeof(ip));
memcpy(ip, tag_start, len);
TSK_DEBUG_INFO("Adding DNS server = %s:%d", ip, TNET_DNS_SERVER_PORT_DEFAULT);
address = tnet_address_create(ip);
address->family = tnet_get_family(ip, TNET_DNS_SERVER_PORT_DEFAULT);
address->dnsserver = 1;
tsk_list_push_ascending_data(servers, (void**)&address);
}
}
break;
/* #line 288 "./src/dns/tnet_dns_resolvconf.c" */
}
}
_again:
if ( ++p != pe )
goto _resume;
_test_eof: {}
}
/* #line 145 "./ragel/tnet_dns_resolvconf.rl" */
TSK_RAGEL_DISABLE_WARNINGS_END()
if (cs <
/* #line 302 "./src/dns/tnet_dns_resolvconf.c" */
0
/* #line 147 "./ragel/tnet_dns_resolvconf.rl" */
) {
TSK_DEBUG_ERROR("Failed to parse %s.", fullpath);
TSK_OBJECT_SAFE_FREE(servers);
}
bail:
TSK_FREE(buf);
return servers;
}
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