#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; }