[reseed] support domains in yggdrasil reseeder, fix IPv6 URL host parsing

Signed-off-by: R4SAS <r4sas@i2pmail.org>

libi2pd/HTTP.cpp

@@ -93,15 +93,18 @@ namespace http
 		std::size_t pos_c = 0; /* < work position */
 		if(url.at(0) != '/' || pos_p > 0) {
 			std::size_t pos_s = 0;
+
 			/* schema */
 			pos_c = url.find("://");
 			if (pos_c != std::string::npos) {
 				schema = url.substr(0, pos_c);
 				pos_p = pos_c + 3;
 			}
+
 			/* user[:pass] */
 			pos_s = url.find('/', pos_p); /* find first slash */
 			pos_c = url.find('@', pos_p); /* find end of 'user' or 'user:pass' part */
+
 			if (pos_c != std::string::npos && (pos_s == std::string::npos || pos_s > pos_c)) {
 				std::size_t delim = url.find(':', pos_p);
 				if (delim && delim != std::string::npos && delim < pos_c) {
@@ -113,21 +116,28 @@ namespace http
 				}
 				pos_p = pos_c + 1;
 			}
+
 			/* hostname[:port][/path] */
-			if (url[pos_p] == '[') // ipv6
+			if (url.at(pos_p) == '[') // ipv6
 			{
 				auto pos_b = url.find(']', pos_p);
 				if (pos_b == std::string::npos) return false;
+				ipv6 = true;
 				pos_c = url.find_first_of(":/", pos_b);
 			}
 			else
 				pos_c = url.find_first_of(":/", pos_p);
+
 			if (pos_c == std::string::npos) {
 				/* only hostname, without post and path */
-				host = url.substr(pos_p, std::string::npos);
+				host = ipv6 ?
+					url.substr(pos_p + 1, url.length() - 1) :
+					url.substr(pos_p, std::string::npos);
 				return true;
 			} else if (url.at(pos_c) == ':') {
-				host = url.substr(pos_p, pos_c - pos_p);
+				host = ipv6 ?
+					url.substr(pos_p + 1, pos_c - pos_p - 2) :
+					url.substr(pos_p, pos_c - pos_p);
 				/* port[/path] */
 				pos_p = pos_c + 1;
 				pos_c = url.find('/', pos_p);
@@ -147,7 +157,9 @@ namespace http
 				pos_p = pos_c;
 			} else {
 				/* start of path part found */
-				host = url.substr(pos_p, pos_c - pos_p);
+				host = ipv6 ?
+					url.substr(pos_p + 1, pos_c - pos_p - 2) :
+					url.substr(pos_p, pos_c - pos_p);
 				pos_p = pos_c;
 			}
 		}
@@ -212,10 +224,18 @@ namespace http
 			} else if (user != "") {
 				out += user + "@";
 			}
-			if (port) {
-				out += host + ":" + std::to_string(port);
+			if (ipv6) {
+				if (port) {
+					out += "[" + host + "]:" + std::to_string(port);
+				} else {
+					out += "[" + host + "]";
+				}
 			} else {
-				out += host;
+				if (port) {
+					out += host + ":" + std::to_string(port);
+				} else {
+					out += host;
+				}
 			}
 		}
 		out += path;

libi2pd/HTTP.h

@@ -36,8 +36,9 @@ namespace http
 		bool hasquery;
 		std::string query;
 		std::string frag;
+		bool ipv6;
 
-		URL(): schema(""), user(""), pass(""), host(""), port(0), path(""), hasquery(false), query(""), frag("") {};
+		URL(): schema(""), user(""), pass(""), host(""), port(0), path(""), hasquery(false), query(""), frag(""), ipv6(false) {};
 
 		/**
 		 * @brief Tries to parse url from string

libi2pd/Reseed.cpp

@@ -703,6 +703,7 @@ namespace data
 						s.lowest_layer().connect (ep, ecode);
 						if (!ecode)
 						{
+							LogPrint (eLogDebug, "Reseed: Resolved to ", ep.address ());
 							connected = true;
 							break;
 						}
@@ -790,17 +791,45 @@ namespace data
 		boost::asio::io_service service;
 		boost::asio::ip::tcp::socket s(service, boost::asio::ip::tcp::v6());
 
-		if (url.host.length () < 2) return ""; // assume []
-		auto host = url.host.substr (1, url.host.length () - 2);
-		LogPrint (eLogDebug, "Reseed: Connecting to Yggdrasil ", url.host, ":", url.port);
-		s.connect (boost::asio::ip::tcp::endpoint (boost::asio::ip::address_v6::from_string (host), url.port), ecode);
+		auto it = boost::asio::ip::tcp::resolver(service).resolve (
+			boost::asio::ip::tcp::resolver::query (url.host, std::to_string(url.port)), ecode);
+
+		if (!ecode)
+		{
+			bool connected = false;
+			boost::asio::ip::tcp::resolver::iterator end;
+			while (it != end)
+			{
+				boost::asio::ip::tcp::endpoint ep = *it;
+				if (
+					i2p::util::net::IsYggdrasilAddress (ep.address ()) &&
+					i2p::context.SupportsMesh ()
+				)
+				{
+					LogPrint (eLogDebug, "Reseed: Yggdrasil: Resolved to ", ep.address ());
+					s.connect (ep, ecode);
+					if (!ecode)
+					{
+						connected = true;
+						break;
+					}
+				}
+				it++;
+			}
+			if (!connected)
+			{
+				LogPrint(eLogError, "Reseed: Yggdrasil: Failed to connect to ", url.host);
+				return "";
+			}
+		}
+
 		if (!ecode)
 		{
-			LogPrint (eLogDebug, "Reseed: Connected to Yggdrasil ", url.host, ":", url.port);
+			LogPrint (eLogDebug, "Reseed: Yggdrasil: Connected to ", url.host, ":", url.port);
 			return ReseedRequest (s, url.to_string());
 		}
 		else
-			LogPrint (eLogError, "Reseed: Couldn't connect to Yggdrasil ", url.host, ": ", ecode.message ());
+			LogPrint (eLogError, "Reseed: Yggdrasil: Couldn't connect to ", url.host, ": ", ecode.message ());
 
 		return "";
 	}