302 lines
7.6 KiB
C
302 lines
7.6 KiB
C
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/* #line 1 "./ragel/tnet_dns_resolvconf.rl" */
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/*
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* Copyright (C) 2009-2010 Mamadou Diop.
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*
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* Contact: Mamadou Diop <diopmamadou(at)doubango.org>
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*
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* This file is part of Open Source Doubango Framework.
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*
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* DOUBANGO is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* DOUBANGO 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with DOUBANGO.
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*
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*/
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/**@file tnet_dns_resolvconf.c
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* @brief Parser for "/etc/resolv.conf" file to retrive DNS servers.
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*
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* @author Mamadou Diop <diopmamadou(at)doubango.org>
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*
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* @date Created: Sat Nov 8 16:54:58 2009 mdiop
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*/
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#include "tnet_dns_resolvconf.h"
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#include "tnet_utils.h"
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#include "dns/tnet_dns.h"
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#include "tsk_string.h"
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#include "tsk_memory.h"
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#include "tsk_ragel_state.h"
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#include "tsk_debug.h"
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#include <string.h>
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/* === Ragel state machine === */
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/* #line 80 "./ragel/tnet_dns_resolvconf.rl" */
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/** Gets list of DNS servers from a conf file.
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* @param path Path of the conf file from which to retrieve the DNS servers.
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* should be @a "/etc/resolv.conf". You can adjust the value by modifying @ref TNET_RESOLV_CONF_PATH.<br>
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* If you are using <b>Android</b> and the resolv.conf file is missing, then run the following line in a command window: <br>
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* <i>ln -s /private/var/run/resolv.conf /etc/resolv.conf</i><br> If this fails, then try to manually add the file.
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* @retval List of DNS servers.
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*/
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tnet_addresses_L_t * tnet_dns_resolvconf_parse(const char* path)
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{
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tnet_addresses_L_t* servers = tsk_null;
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tnet_ip_t ip;
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const char* fullpath = path;
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const char* tag_start;
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FILE* fd;
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char buf[4092];
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// Ragel
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int cs = 0;
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const char *p;
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const char *pe;
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const char *eof;
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/* #line 74 "./src/dns/tnet_dns_resolvconf.c" */
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static const char _tdns_machine_resolvconf_actions[] = {
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0, 1, 0, 1, 1
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};
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static const char _tdns_machine_resolvconf_key_offsets[] = {
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0, 6, 7, 8, 11, 14, 14, 20,
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22, 25, 28, 31, 34, 37, 40, 43,
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46, 49, 50, 51, 54
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};
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static const char _tdns_machine_resolvconf_trans_keys[] = {
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10, 13, 32, 35, 78, 110, 32, 32,
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10, 13, 32, 10, 13, 32, 10, 13,
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32, 35, 78, 110, 10, 13, 32, 65,
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97, 32, 77, 109, 32, 69, 101, 32,
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83, 115, 32, 69, 101, 32, 82, 114,
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32, 86, 118, 32, 69, 101, 32, 82,
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114, 32, 32, 10, 13, 32, 32, 35,
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78, 110, 0
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};
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static const char _tdns_machine_resolvconf_single_lengths[] = {
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6, 1, 1, 3, 3, 0, 6, 2,
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3, 3, 3, 3, 3, 3, 3, 3,
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3, 1, 1, 3, 4
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};
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static const char _tdns_machine_resolvconf_range_lengths[] = {
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0
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};
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static const char _tdns_machine_resolvconf_index_offsets[] = {
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0, 7, 9, 11, 15, 19, 20, 27,
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30, 34, 38, 42, 46, 50, 54, 58,
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62, 66, 68, 70, 74
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};
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static const char _tdns_machine_resolvconf_indicies[] = {
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1, 1, 2, 3, 4, 4, 0, 5,
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0, 5, 6, 7, 7, 8, 6, 7,
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7, 8, 9, 9, 1, 1, 5, 3,
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4, 4, 0, 7, 7, 3, 5, 10,
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10, 0, 5, 11, 11, 0, 5, 12,
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12, 0, 5, 13, 13, 0, 5, 14,
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14, 0, 5, 15, 15, 0, 5, 16,
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16, 0, 5, 17, 17, 0, 5, 18,
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18, 0, 19, 0, 19, 20, 22, 22,
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23, 21, 2, 3, 4, 4, 0, 0
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};
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static const char _tdns_machine_resolvconf_trans_targs[] = {
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1, 6, 20, 7, 8, 2, 3, 0,
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4, 5, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 19, 0, 4
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};
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static const char _tdns_machine_resolvconf_trans_actions[] = {
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 1, 0, 3, 3
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};
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static const int tdns_machine_resolvconf_start = 0;
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static const int tdns_machine_resolvconf_first_final = 0;
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static const int tdns_machine_resolvconf_error = -1;
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static const int tdns_machine_resolvconf_en_main = 0;
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/* #line 105 "./ragel/tnet_dns_resolvconf.rl" */
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if(tsk_strnullORempty(fullpath)){
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fullpath = TNET_RESOLV_CONF_PATH;
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}
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/* Open the file and read all data */
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if((fd = fopen(fullpath, "r"))){
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int len = fread(buf, sizeof(uint8_t), sizeof(buf)-2, fd);
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p = &buf[0];
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pe = p + len + 1/*hack*/;
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eof = pe;
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fclose(fd);
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buf[len] = '\n'; // hack to have perfect lines
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servers = tsk_list_create();
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}
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else{
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#if ANDROID
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TSK_DEBUG_INFO("Failed to open [%s]. But don't panic, we have detected that you are using Google Android System.\n"
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"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.",
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fullpath);
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#else
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TSK_DEBUG_ERROR("Failed to open %s.", fullpath);
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#endif
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goto bail;
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}
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/* #line 176 "./src/dns/tnet_dns_resolvconf.c" */
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{
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cs = tdns_machine_resolvconf_start;
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}
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/* #line 134 "./ragel/tnet_dns_resolvconf.rl" */
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/* #line 183 "./src/dns/tnet_dns_resolvconf.c" */
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{
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int _klen;
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unsigned int _trans;
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const char *_acts;
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unsigned int _nacts;
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const char *_keys;
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if ( p == pe )
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goto _test_eof;
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_resume:
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_keys = _tdns_machine_resolvconf_trans_keys + _tdns_machine_resolvconf_key_offsets[cs];
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_trans = _tdns_machine_resolvconf_index_offsets[cs];
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_klen = _tdns_machine_resolvconf_single_lengths[cs];
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if ( _klen > 0 ) {
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const char *_lower = _keys;
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const char *_mid;
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const char *_upper = _keys + _klen - 1;
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while (1) {
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if ( _upper < _lower )
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break;
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_mid = _lower + ((_upper-_lower) >> 1);
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if ( (*p) < *_mid )
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_upper = _mid - 1;
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else if ( (*p) > *_mid )
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_lower = _mid + 1;
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else {
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_trans += (_mid - _keys);
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goto _match;
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}
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}
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_keys += _klen;
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_trans += _klen;
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}
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_klen = _tdns_machine_resolvconf_range_lengths[cs];
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if ( _klen > 0 ) {
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const char *_lower = _keys;
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const char *_mid;
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const char *_upper = _keys + (_klen<<1) - 2;
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while (1) {
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if ( _upper < _lower )
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break;
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_mid = _lower + (((_upper-_lower) >> 1) & ~1);
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if ( (*p) < _mid[0] )
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_upper = _mid - 2;
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else if ( (*p) > _mid[1] )
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_lower = _mid + 2;
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else {
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_trans += ((_mid - _keys)>>1);
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goto _match;
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}
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}
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_trans += _klen;
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}
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_match:
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_trans = _tdns_machine_resolvconf_indicies[_trans];
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cs = _tdns_machine_resolvconf_trans_targs[_trans];
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if ( _tdns_machine_resolvconf_trans_actions[_trans] == 0 )
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goto _again;
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_acts = _tdns_machine_resolvconf_actions + _tdns_machine_resolvconf_trans_actions[_trans];
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_nacts = (unsigned int) *_acts++;
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while ( _nacts-- > 0 )
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{
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switch ( *_acts++ )
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{
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case 0:
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/* #line 47 "./ragel/tnet_dns_resolvconf.rl" */
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{
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tag_start = p;
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}
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break;
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case 1:
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/* #line 51 "./ragel/tnet_dns_resolvconf.rl" */
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{
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int len = (int)(p - tag_start);
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if(len && len<=sizeof(ip)){
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tnet_address_t *address;
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memset(ip, '\0', sizeof(ip));
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memcpy(ip, tag_start, len);
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address = tnet_address_create(ip);
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address->family = tnet_get_family(ip, TNET_DNS_SERVER_PORT_DEFAULT);
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address->dnsserver = 1;
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tsk_list_push_ascending_data(servers, (void**)&address);
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}
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}
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break;
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/* #line 277 "./src/dns/tnet_dns_resolvconf.c" */
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}
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}
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_again:
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if ( ++p != pe )
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goto _resume;
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_test_eof: {}
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}
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/* #line 135 "./ragel/tnet_dns_resolvconf.rl" */
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if( cs <
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/* #line 290 "./src/dns/tnet_dns_resolvconf.c" */
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0
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/* #line 136 "./ragel/tnet_dns_resolvconf.rl" */
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){
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TSK_DEBUG_ERROR("Failed to parse %s.", fullpath);
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TSK_OBJECT_SAFE_FREE(servers);
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}
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bail:
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return servers;
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}
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