diff options
Diffstat (limited to 'tinyNET/src/dns/tnet_dns_resolvconf.c')
| -rw-r--r-- | tinyNET/src/dns/tnet_dns_resolvconf.c | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/tinyNET/src/dns/tnet_dns_resolvconf.c b/tinyNET/src/dns/tnet_dns_resolvconf.c new file mode 100644 index 0000000..887ecfc --- /dev/null +++ b/tinyNET/src/dns/tnet_dns_resolvconf.c @@ -0,0 +1,301 @@ +
+/* #line 1 "./ragel/tnet_dns_resolvconf.rl" */
+/*
+* Copyright (C) 2009-2010 Mamadou Diop.
+*
+* Contact: Mamadou Diop <diopmamadou(at)doubango.org>
+*
+* 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.
+ *
+ * @author Mamadou Diop <diopmamadou(at)doubango.org>
+ *
+ * @date Created: Sat Nov 8 16:54:58 2009 mdiop
+ */
+#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 80 "./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;
+ FILE* fd;
+ char buf[4092];
+
+ // Ragel
+ int cs = 0;
+ const char *p;
+ const char *pe;
+ const char *eof;
+
+
+/* #line 74 "./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, 6, 7, 8, 11, 14, 14, 20,
+ 22, 25, 28, 31, 34, 37, 40, 43,
+ 46, 49, 50, 51, 54
+};
+
+static const char _tdns_machine_resolvconf_trans_keys[] = {
+ 10, 13, 32, 35, 78, 110, 32, 32,
+ 10, 13, 32, 10, 13, 32, 10, 13,
+ 32, 35, 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,
+ 78, 110, 0
+};
+
+static const char _tdns_machine_resolvconf_single_lengths[] = {
+ 6, 1, 1, 3, 3, 0, 6, 2,
+ 3, 3, 3, 3, 3, 3, 3, 3,
+ 3, 1, 1, 3, 4
+};
+
+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, 7, 9, 11, 15, 19, 20, 27,
+ 30, 34, 38, 42, 46, 50, 54, 58,
+ 62, 66, 68, 70, 74
+};
+
+static const char _tdns_machine_resolvconf_indicies[] = {
+ 1, 1, 2, 3, 4, 4, 0, 5,
+ 0, 5, 6, 7, 7, 8, 6, 7,
+ 7, 8, 9, 9, 1, 1, 5, 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, 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 105 "./ragel/tnet_dns_resolvconf.rl" */
+
+ if(tsk_strnullORempty(fullpath)){
+ fullpath = TNET_RESOLV_CONF_PATH;
+ }
+
+ /* Open the file and read all data */
+ if((fd = fopen(fullpath, "r"))){
+ int len = fread(buf, sizeof(uint8_t), sizeof(buf)-2, 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
+ TSK_DEBUG_INFO("Failed to open [%s]. But don't panic, we have detected that you are using Google Android System.\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;
+ }
+
+
+/* #line 176 "./src/dns/tnet_dns_resolvconf.c" */
+ {
+ cs = tdns_machine_resolvconf_start;
+ }
+
+/* #line 134 "./ragel/tnet_dns_resolvconf.rl" */
+
+/* #line 183 "./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 47 "./ragel/tnet_dns_resolvconf.rl" */
+ {
+ tag_start = p;
+ }
+ break;
+ case 1:
+/* #line 51 "./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);
+
+ 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 277 "./src/dns/tnet_dns_resolvconf.c" */
+ }
+ }
+
+_again:
+ if ( ++p != pe )
+ goto _resume;
+ _test_eof: {}
+ }
+
+/* #line 135 "./ragel/tnet_dns_resolvconf.rl" */
+
+ if( cs <
+/* #line 290 "./src/dns/tnet_dns_resolvconf.c" */
+0
+/* #line 136 "./ragel/tnet_dns_resolvconf.rl" */
+ ){
+ TSK_DEBUG_ERROR("Failed to parse %s.", fullpath);
+ TSK_OBJECT_SAFE_FREE(servers);
+ }
+
+bail:
+ return servers;
+}
+
+
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