diff options
Diffstat (limited to 'tinyNET/ragel/tnet_dns_resolvconf.rl')
| -rw-r--r-- | tinyNET/ragel/tnet_dns_resolvconf.rl | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/tinyNET/ragel/tnet_dns_resolvconf.rl b/tinyNET/ragel/tnet_dns_resolvconf.rl new file mode 100644 index 0000000..3d8d064 --- /dev/null +++ b/tinyNET/ragel/tnet_dns_resolvconf.rl @@ -0,0 +1,145 @@ +/*
+* 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 === */
+%%{
+ machine tdns_machine_resolvconf;
+
+ action tag{
+ tag_start = p;
+ }
+
+ action add_dns{
+ 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);
+ }
+ }
+
+ SP = " ";
+ LF = "\n";
+ CR = "\r";
+ CRLF = CR LF;
+ ENDL = (LF | CR | CRLF);
+
+ o_name = any+;
+ o_value = any+;
+
+ COMMENT = SP*<: "#" any*;
+ OPTION_ANY = SP*<: o_name :>SP+<: o_value :>SP*;
+ OPTION_DNS = SP*<: "nameserver"i :>SP+<: o_value>tag %add_dns :>SP*;
+ LINE = (OPTION_DNS)@100 | (OPTION_ANY)@0 | (COMMENT)@50;
+
+ main := ((LINE :>ENDL) | ENDL)* %3 any* %2;
+}%%
+
+/** 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;
+
+ %%write data;
+
+ 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;
+ }
+
+ %%write init;
+ %%write exec;
+
+ if( cs < %%{ write first_final; }%% ){
+ TSK_DEBUG_ERROR("Failed to parse %s.", fullpath);
+ TSK_OBJECT_SAFE_FREE(servers);
+ }
+
+bail:
+ return servers;
+}
+
+
|
