Simulate AF_INET addresses for 4in6 connections [danieldg]

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@10779 e03df62e-2008-0410-955e-edbf42e46eb7

2 files changed, 16 insertions, 9 deletions

diff --git a/src/listensocket.cpp b/src/listensocket.cpp
index 86d36cce0..6fa6785bd 100644
--- a/src/listensocket.cpp
+++ b/src/listensocket.cpp
@@ -120,7 +120,7 @@ void ListenSocketBase::AcceptInternal()
 	}
 
 	static char buf[MAXBUF];
-	static char target[MAXBUF];	
+	static char target[MAXBUF];
 
 	*target = *buf = '\0';
 
@@ -133,13 +133,20 @@ void ListenSocketBase::AcceptInternal()
 			inet_ntop(AF_INET6, &((const sockaddr_in6*)raddr)->sin6_addr, target, sizeof(target));
 		else
 			ServerInstance->Logs->Log("SOCKET", DEBUG, "Can't get peername: %s", strerror(errno));
-		if (!strncmp(buf, "::ffff:", 7))
+
+		static const unsigned char prefix4in6[12] = { 0,0,0,0,  0,0,0,0, 0,0,0xFF,0xFF };
+		if (!memcmp(prefix4in6, &((const sockaddr_in6*)client)->sin6_addr, 12))
 		{
+			// strip leading ::ffff: from the IPs
 			memmove(buf, buf+7, sizeof(buf)-7);
-		}
-		if (!strncmp(target, "::ffff:", 7))
-		{
 			memmove(target, target+7, sizeof(target)-7);
+
+			// recreate as a sockaddr_in using the IPv4 IP
+			uint16_t sport = ((const sockaddr_in6*)client)->sin6_port;
+			struct sockaddr_in* clientv4 = (struct sockaddr_in*)client;
+			clientv4->sin_family = AF_INET;
+			clientv4->sin_port = sport;
+			inet_pton(AF_INET, buf, &clientv4->sin_addr);
 		}
 	}
 	else
@@ -176,5 +183,5 @@ void ListenSocketBase::HandleEvent(EventType e, int err)
 
 void ClientListenSocket::OnAcceptReady(const std::string &ipconnectedto, int nfd, const std::string &incomingip)
 {
-	ServerInstance->Users->AddUser(ServerInstance, nfd, bind_port, false, this->family, client, ipconnectedto);
+	ServerInstance->Users->AddUser(ServerInstance, nfd, bind_port, false, client, ipconnectedto);
 }
diff --git a/src/usermanager.cpp b/src/usermanager.cpp
index e526238ed..521dcec41 100644
--- a/src/usermanager.cpp
+++ b/src/usermanager.cpp
@@ -18,7 +18,7 @@
 #include "bancache.h"
 
 /* add a client connection to the sockets list */
-void UserManager::AddUser(InspIRCd* Instance, int socket, int port, bool iscached, int socketfamily, sockaddr* ip, const std::string &targetip)
+void UserManager::AddUser(InspIRCd* Instance, int socket, int port, bool iscached, sockaddr* ip, const std::string &targetip)
 {
 	/* NOTE: Calling this one parameter constructor for User automatically
 	 * allocates a new UUID and places it in the hash_map.
@@ -37,14 +37,14 @@ void UserManager::AddUser(InspIRCd* Instance, int socket, int port, bool iscache
 
 	char ipaddr[MAXBUF];
 #ifdef IPV6
-	if (socketfamily == AF_INET6)
+	if (ip->sa_family == AF_INET6)
 		inet_ntop(AF_INET6, &((const sockaddr_in6*)ip)->sin6_addr, ipaddr, sizeof(ipaddr));
 	else
 #endif
 		inet_ntop(AF_INET, &((const sockaddr_in*)ip)->sin_addr, ipaddr, sizeof(ipaddr));
 
 	New->SetFd(socket);
-	New->SetSockAddr(socketfamily, ipaddr, port);
+	New->SetSockAddr(ip->sa_family, ipaddr, port);
 
 	/* Give each of the modules an attempt to hook the user for I/O */
 	FOREACH_MOD_I(Instance, I_OnHookUserIO, OnHookUserIO(New, targetip));