Adding support for config file

Example:
-port=17070
--port=17070

cat /home/$USER/.i2pd/i2p.conf
port=17070

Makefile

@@ -6,7 +6,7 @@ OBJECTS = obj/i2p.o obj/base64.o obj/NTCPSession.o obj/RouterInfo.o obj/Transpor
     obj/TunnelGateway.o obj/TransitTunnel.o obj/I2NPProtocol.o obj/Log.o obj/Garlic.o \
     obj/HTTPServer.o obj/Streaming.o obj/Identity.o obj/SSU.o obj/util.o obj/Reseed.o
 INCFLAGS = 
-LDFLAGS = -Wl,-rpath,/usr/local/lib -lcryptopp -lboost_system -lboost_filesystem -lboost_regex -lpthread
+LDFLAGS = -Wl,-rpath,/usr/local/lib -lcryptopp -lboost_system -lboost_filesystem -lboost_regex -lboost_program_options -lpthread
 LIBS = 
 
 all: obj i2p

i2p.cpp

@@ -1,6 +1,7 @@
 #include <iostream>
 #include <thread>
 #include <cryptopp/integer.h>
+#include <boost/filesystem.hpp>
 #include "Log.h"
 #include "base64.h"
 #include "Transports.h"
@@ -14,7 +15,7 @@
 
 int main( int argc, char* argv[] )
 {
-  i2p::util::OptionParser(argc,argv);
+  i2p::util::config::OptionParser(argc,argv);
 #ifdef _WIN32
   setlocale(LC_CTYPE, "");
   SetConsoleCP(1251);
@@ -22,10 +23,24 @@ int main( int argc, char* argv[] )
   setlocale(LC_ALL, "Russian");
 #endif
 
+  LogPrint("\n\n\n\ni2pd starting\n");
+  LogPrint("default data directory: ", i2p::util::filesystem::GetDefaultDataDir().string());
+  if (!boost::filesystem::exists( i2p::util::filesystem::GetDefaultDataDir() ))
+  {
+    // Create data directory
+    if (!boost::filesystem::create_directory( i2p::util::filesystem::GetDefaultDataDir() ))
+    {
+      LogPrint("Failed to create data directory, exiting! :(");
+      return -1;
+    }
+  }
+  i2p::util::filesystem::ReadConfigFile(i2p::util::config::mapArgs, i2p::util::config::mapMultiArgs);
+
   //TODO: This is an ugly workaround. fix it.
   //TODO: Autodetect public IP.
-  i2p::context.OverrideNTCPAddress(i2p::util::GetCharArg("--host", "127.0.0.1"), i2p::util::GetIntArg("--port", 17070));
-  int httpport = i2p::util::GetIntArg("--httpport", 7070);
+  i2p::context.OverrideNTCPAddress(i2p::util::config::GetCharArg("-host", "127.0.0.1"),
+      i2p::util::config::GetArg("-port", 17070));
+  int httpport = i2p::util::config::GetArg("-httpport", 7070);
 
   i2p::util::HTTPServer httpServer (httpport);
 

util.cpp

@@ -3,7 +3,13 @@
 #include <cctype>
 #include <functional>
 #include <fstream>
+#include <set>
 #include <boost/asio.hpp>
+#include <boost/filesystem.hpp>
+#include <boost/filesystem/fstream.hpp>
+#include <boost/foreach.hpp>
+#include <boost/program_options/detail/config_file.hpp>
+#include <boost/program_options/parsers.hpp>
 #include "util.h"
 #include "Log.h"
 
@@ -11,40 +17,154 @@ namespace i2p
 {
 namespace util
 {
-std::map<std::string, std::string> mapArgs;
 
-void OptionParser(int argc, const char* const argv[])
+namespace config
 {
-	mapArgs.clear();
-    for (int i = 1; i < argc; i++)
-    {
-    	std::string strKey (argv[i]);
-    	std::string strValue;
-    	size_t has_data = strKey.find('=');
-    	if (has_data != std::string::npos)
-    	{
-    		strValue = strKey.substr(has_data+1);
-    		strKey = strKey.substr(0, has_data);
-    	}
-    	if (strKey[0] != '-')
-    		break;
-
-        mapArgs[strKey] = strValue;
-    }
-}
+	std::map<std::string, std::string> mapArgs;
+	std::map<std::string, std::vector<std::string> > mapMultiArgs;
 
-int GetIntArg(const std::string& strArg, int nDefault)
-{
-    if (mapArgs.count(strArg))
-        return atoi(mapArgs[strArg].c_str());
-    return nDefault;
+	void OptionParser(int argc, const char* const argv[])
+	{
+		mapArgs.clear();
+		mapMultiArgs.clear();
+		for (int i = 1; i < argc; i++)
+		{
+			std::string strKey (argv[i]);
+			std::string strValue;
+			size_t has_data = strKey.find('=');
+			if (has_data != std::string::npos)
+			{
+				strValue = strKey.substr(has_data+1);
+				strKey = strKey.substr(0, has_data);
+			}
+
+#ifdef WIN32
+			boost::to_lower(strKey);
+			if (boost::algorithm::starts_with(strKey, "/"))
+				strKey = "-" + strKey.substr(1);
+#endif
+			if (strKey[0] != '-')
+				break;
+
+			mapArgs[strKey] = strValue;
+			mapMultiArgs[strKey].push_back(strValue);
+		}
+
+		BOOST_FOREACH(PAIRTYPE(const std::string,std::string)& entry, mapArgs)
+		{
+			std::string name = entry.first;
+
+			//  interpret --foo as -foo (as long as both are not set)
+			if (name.find("--") == 0)
+			{
+				std::string singleDash(name.begin()+1, name.end());
+				if (mapArgs.count(singleDash) == 0)
+					mapArgs[singleDash] = entry.second;
+				name = singleDash;
+			}
+		}
+	}
+
+	const char* GetCharArg(const std::string& strArg, const std::string& nDefault)
+	{
+		if (mapArgs.count(strArg))
+			return mapArgs[strArg].c_str();
+		return nDefault.c_str();
+	}
+
+	std::string GetArg(const std::string& strArg, const std::string& strDefault)
+	{
+		if (mapArgs.count(strArg))
+			return mapArgs[strArg];
+		return strDefault;
+	}
+
+	int GetArg(const std::string& strArg, int nDefault)
+	{
+		if (mapArgs.count(strArg))
+			return atoi(mapArgs[strArg].c_str());
+		return nDefault;
+	}
 }
 
-const char* GetCharArg(const std::string& strArg, const std::string& nDefault)
+namespace filesystem
 {
-    if (mapArgs.count(strArg))
-        return mapArgs[strArg].c_str();
-    return nDefault.c_str();
+	const boost::filesystem::path &GetDataDir(bool fNetSpecific)
+	{
+
+		static boost::filesystem::path path;
+
+		if (config::mapArgs.count("--datadir")) {
+			path = boost::filesystem::system_complete(config::mapArgs["--datadir"]);
+			if (!boost::filesystem::is_directory(path)) {
+				path = "";
+				return path;
+			}
+		} else {
+			path = GetDefaultDataDir();
+		}
+
+		boost::filesystem::create_directory(path);
+
+		return path;
+	}
+
+	boost::filesystem::path GetConfigFile()
+	{
+		boost::filesystem::path pathConfigFile(i2p::util::config::GetArg("-conf", "i2p.conf"));
+		if (!pathConfigFile.is_complete()) pathConfigFile = GetDataDir(false) / pathConfigFile;
+		return pathConfigFile;
+	}
+
+	void ReadConfigFile(std::map<std::string, std::string>& mapSettingsRet,
+						std::map<std::string, std::vector<std::string> >& mapMultiSettingsRet)
+	{
+		boost::filesystem::ifstream streamConfig(GetConfigFile());
+		if (!streamConfig.good())
+			return; // No i2pd.conf file is OK
+
+		std::set<std::string> setOptions;
+		setOptions.insert("*");
+
+		for (boost::program_options::detail::config_file_iterator it(streamConfig, setOptions), end; it != end; ++it)
+		{
+			// Don't overwrite existing settings so command line settings override i2pd.conf
+			std::string strKey = std::string("-") + it->string_key;
+			if (mapSettingsRet.count(strKey) == 0)
+			{
+				mapSettingsRet[strKey] = it->value[0];
+			}
+			mapMultiSettingsRet[strKey].push_back(it->value[0]);
+		}
+	}
+
+	boost::filesystem::path GetDefaultDataDir()
+	{
+		// Windows < Vista: C:\Documents and Settings\Username\Application Data\i2pd
+		// Windows >= Vista: C:\Users\Username\AppData\Roaming\i2pd
+		// Mac: ~/Library/Application Support/i2pd
+		// Unix: ~/.i2pd
+#ifdef WIN32
+		// Windows
+		return GetSpecialFolderPath(CSIDL_APPDATA) / "i2pd";
+#else
+		boost::filesystem::path pathRet;
+		char* pszHome = getenv("HOME");
+		if (pszHome == NULL || strlen(pszHome) == 0)
+			pathRet = boost::filesystem::path("/");
+		else
+			pathRet = boost::filesystem::path(pszHome);
+#ifdef MAC_OSX
+		// Mac
+		pathRet /= "Library/Application Support";
+		boost::filesystem::create_directory(pathRet);
+		return pathRet / "i2pd";
+#else
+		// Unix
+		return pathRet / ".i2pd";
+#endif
+#endif
+	}
 }
 
 namespace http
@@ -102,26 +222,26 @@ namespace http
 
 	void url::parse(const std::string& url_s)
 	{
-    	const std::string prot_end("://");
-    	std::string::const_iterator prot_i = search(url_s.begin(), url_s.end(),
-                                           prot_end.begin(), prot_end.end());
-    	protocol_.reserve(distance(url_s.begin(), prot_i));
-    	transform(url_s.begin(), prot_i,
-              back_inserter(protocol_),
-              std::ptr_fun<int,int>(tolower)); // protocol is icase
-    	if( prot_i == url_s.end() )
-        	return;
-    	advance(prot_i, prot_end.length());
-    	std::string::const_iterator path_i = find(prot_i, url_s.end(), '/');
-    	host_.reserve(distance(prot_i, path_i));
-    	transform(prot_i, path_i,
-              back_inserter(host_),
-              std::ptr_fun<int,int>(tolower)); // host is icase
-    	std::string::const_iterator query_i = find(path_i, url_s.end(), '?');
-    	path_.assign(path_i, query_i);
-    	if( query_i != url_s.end() )
-        	++query_i;
-    	query_.assign(query_i, url_s.end());
+		const std::string prot_end("://");
+		std::string::const_iterator prot_i = search(url_s.begin(), url_s.end(),
+										   prot_end.begin(), prot_end.end());
+		protocol_.reserve(distance(url_s.begin(), prot_i));
+		transform(url_s.begin(), prot_i,
+			  back_inserter(protocol_),
+			  std::ptr_fun<int,int>(tolower)); // protocol is icase
+		if( prot_i == url_s.end() )
+			return;
+		advance(prot_i, prot_end.length());
+		std::string::const_iterator path_i = find(prot_i, url_s.end(), '/');
+		host_.reserve(distance(prot_i, path_i));
+		transform(prot_i, path_i,
+			  back_inserter(host_),
+			  std::ptr_fun<int,int>(tolower)); // host is icase
+		std::string::const_iterator query_i = find(path_i, url_s.end(), '?');
+		path_.assign(path_i, query_i);
+		if( query_i != url_s.end() )
+			++query_i;
+		query_.assign(query_i, url_s.end());
 	}
 
 }

util.h

@@ -4,14 +4,30 @@
 #include <map>
 #include <string>
 
+#define PAIRTYPE(t1, t2)    std::pair<t1, t2>
+
 namespace i2p
 {
 namespace util
 {
-	extern std::map<std::string, std::string> mapArgs;
-	void OptionParser(int argc, const char* const argv[]);
-	int GetIntArg(const std::string& strArg, int nDefault);
-	const char* GetCharArg(const std::string& strArg, const std::string& nDefault);
+	namespace config
+	{
+		extern std::map<std::string, std::string> mapArgs;
+		extern std::map<std::string, std::vector<std::string> > mapMultiArgs;
+		void OptionParser(int argc, const char* const argv[]);
+		int GetArg(const std::string& strArg, int nDefault);
+		std::string GetArg(const std::string& strArg, const std::string& strDefault);
+		const char* GetCharArg(const std::string& strArg, const std::string& nDefault);
+	}
+
+	namespace filesystem
+	{
+		boost::filesystem::path GetDefaultDataDir();
+		boost::filesystem::path GetConfigFile();
+		void ReadConfigFile(std::map<std::string, std::string>& mapSettingsRet,
+                std::map<std::string, std::vector<std::string> >& mapMultiSettingsRet);
+	}
+
 	namespace http
 	{
 		std::string httpRequest(const std::string& address);