Merge pull request #1021 from sipa/ipv6

IPv6 node support

14 files changed, 347 insertions, 119 deletions

diff --git a/bitcoin-qt.pro b/bitcoin-qt.pro
index c19fd4e002..bc557bc1eb 100644
--- a/bitcoin-qt.pro
+++ b/bitcoin-qt.pro
@@ -2,7 +2,7 @@ TEMPLATE = app
 TARGET =
 VERSION = 0.6.99
 INCLUDEPATH += src src/json src/qt
-DEFINES += QT_GUI BOOST_THREAD_USE_LIB
+DEFINES += QT_GUI BOOST_THREAD_USE_LIB USE_IPV6
 CONFIG += no_include_pwd
 
 # for boost 1.37, add -mt to the boost libraries 
diff --git a/doc/build-osx.txt b/doc/build-osx.txt
index 2ae77067fc..256614f7ab 100644
--- a/doc/build-osx.txt
+++ b/doc/build-osx.txt
@@ -44,7 +44,7 @@ sudo port install qrencode
 4.  Now you should be able to build bitcoind:
 
 cd bitcoin/src
-make -f makefile.osx
+make -f makefile.osx USE_IPV6=1
 
 Run:
   ./bitcoind --help  # for a list of command-line options.
diff --git a/doc/build-unix.txt b/doc/build-unix.txt
index c5b4205084..eb59736816 100644
--- a/doc/build-unix.txt
+++ b/doc/build-unix.txt
@@ -43,6 +43,9 @@ your package manager. Set USE_QRCODE to control this:
  USE_QRCODE=0   (the default) No QRCode support - libarcode not required
  USE_QRCODE=1   QRCode support enabled
 
+IPv6 support may be enabled by setting
+ USE_IPV6=1    Enable IPv6 support
+
 Licenses of statically linked libraries:
  Berkeley DB   New BSD license with additional requirement that linked
                software must be free open source
@@ -80,7 +83,7 @@ emerge -av1 --noreplace boost glib openssl sys-libs/db:4.8
 
 Take the following steps to build (no UPnP support):
  cd ${BITCOIN_DIR}/src
- make -f makefile.unix USE_UPNP= BDB_INCLUDE_PATH='/usr/include/db4.8'
+ make -f makefile.unix USE_UPNP= USE_IPV6=1 BDB_INCLUDE_PATH='/usr/include/db4.8'
  strip bitcoind
 
 
diff --git a/src/init.cpp b/src/init.cpp
index 60927f20b3..877b1d471f 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -119,6 +119,18 @@ bool AppInit(int argc, char* argv[])
     return fRet;
 }
 
+bool static Bind(const CService &addr) {
+    if (IsLimited(addr))
+        return false;
+    std::string strError;
+    if (!BindListenPort(addr, strError))
+    {
+        ThreadSafeMessageBox(strError, _("Bitcoin"), wxOK | wxMODAL);
+        return false;
+    }
+    return true;
+}
+
 bool AppInit2(int argc, char* argv[])
 {
 #ifdef _MSC_VER
@@ -180,6 +192,7 @@ bool AppInit2(int argc, char* argv[])
             "  -timeout=<n>     \t  "   + _("Specify connection timeout (in milliseconds)") + "\n" +
             "  -proxy=<ip:port> \t  "   + _("Connect through socks proxy") + "\n" +
             "  -socks=<n>       \t  "   + _("Select the version of socks proxy to use (4 or 5, 5 is default)") + "\n" +
+            "  -noproxy=<net>   \t  "   + _("Do not use proxy for connections to network net (ipv4 or ipv6)") + "\n" +
             "  -dns             \t  "   + _("Allow DNS lookups for -addnode, -seednode and -connect") + "\n" +
             "  -proxydns        \t  "   + _("Pass DNS requests to (SOCKS5) proxy") + "\n" +
             "  -port=<port>     \t\t  " + _("Listen for connections on <port> (default: 8333 or testnet: 18333)") + "\n" +
@@ -188,9 +201,11 @@ bool AppInit2(int argc, char* argv[])
             "  -connect=<ip>    \t\t  " + _("Connect only to the specified node") + "\n" +
             "  -seednode=<ip>   \t\t  " + _("Connect to a node to retrieve peer addresses, and disconnect") + "\n" +
             "  -externalip=<ip> \t  "   + _("Specify your own public address") + "\n" +
+            "  -blocknet=<net>  \t  "   + _("Do not connect to addresses in network net (ipv4, ipv6)") + "\n" +
             "  -discover        \t  "   + _("Try to discover public IP address (default: 1)") + "\n" +
             "  -irc             \t  "   + _("Find peers using internet relay chat (default: 0)") + "\n" +
             "  -listen          \t  "   + _("Accept connections from outside (default: 1)") + "\n" +
+            "  -bind=<addr>     \t  "   + _("Bind to given address. Use [host]:port notation for IPv6") + "\n" +
 #ifdef QT_GUI
             "  -lang=<lang>     \t\t  " + _("Set language, for example \"de_DE\" (default: system locale)") + "\n" +
 #endif
@@ -532,9 +547,25 @@ bool AppInit2(int argc, char* argv[])
         }
     }
 
+    if (mapArgs.count("-noproxy"))
+    {
+        BOOST_FOREACH(std::string snet, mapMultiArgs["-noproxy"]) {
+            enum Network net = ParseNetwork(snet);
+            if (net == NET_UNROUTABLE) {
+                ThreadSafeMessageBox(_("Unknown network specified in -noproxy"), _("Bitcoin"), wxOK | wxMODAL);
+                return false;
+            }
+            SetNoProxy(net);
+        }
+    }
+
     if (mapArgs.count("-connect"))
         SoftSetBoolArg("-dnsseed", false);
- 
+
+    // even in Tor mode, if -bind is specified, you really want -listen
+    if (mapArgs.count("-bind"))
+        SoftSetBoolArg("-listen", true);
+
     bool fTor = (fUseProxy && addrProxy.GetPort() == 9050);
     if (fTor)
     {
@@ -547,6 +578,17 @@ bool AppInit2(int argc, char* argv[])
         SoftSetBoolArg("-discover", false);
     }
 
+    if (mapArgs.count("-blocknet")) {
+        BOOST_FOREACH(std::string snet, mapMultiArgs["-blocknet"]) {
+            enum Network net = ParseNetwork(snet);
+            if (net == NET_UNROUTABLE) {
+                ThreadSafeMessageBox(_("Unknown network specified in -blocknet"), _("Bitcoin"), wxOK | wxMODAL);
+                return false;
+            }
+            SetLimited(net);
+        }
+    }
+
     fNameLookup = GetBoolArg("-dns");
     fProxyNameLookup = GetBoolArg("-proxydns");
     if (fProxyNameLookup)
@@ -563,14 +605,23 @@ bool AppInit2(int argc, char* argv[])
     const char* pszP2SH = "/P2SH/";
     COINBASE_FLAGS << std::vector<unsigned char>(pszP2SH, pszP2SH+strlen(pszP2SH));
 
+    bool fBound = false;
     if (!fNoListen)
     {
         std::string strError;
-        if (!BindListenPort(strError))
-        {
-            ThreadSafeMessageBox(strError, _("Bitcoin"), wxOK | wxMODAL);
-            return false;
+        if (mapArgs.count("-bind")) {
+            BOOST_FOREACH(std::string strBind, mapMultiArgs["-bind"]) {
+                fBound |= Bind(CService(strBind, GetDefaultPort(), false));
+            }
+        } else {
+            struct in_addr inaddr_any = {s_addr: INADDR_ANY};
+            fBound |= Bind(CService(inaddr_any, GetDefaultPort()));
+#ifdef USE_IPV6
+            fBound |= Bind(CService(in6addr_any, GetDefaultPort()));
+#endif
         }
+        if (!fBound)
+            return false;
     }
 
     if (mapArgs.count("-externalip"))
diff --git a/src/irc.cpp b/src/irc.cpp
index f20152495e..525bd7a8da 100644
--- a/src/irc.cpp
+++ b/src/irc.cpp
@@ -246,7 +246,7 @@ void ThreadIRCSeed2(void* parg)
                 return;
         }
 
-        CNetAddr addrLocal;
+        CService addrLocal;
         string strMyName;
         if (GetLocal(addrLocal, &addrConnect))
             strMyName = EncodeAddress(GetLocalAddress(&addrConnect));
diff --git a/src/main.cpp b/src/main.cpp
index 98f9b71ef5..20bb56e964 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2419,18 +2419,17 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
         }
 
         // Store the new addresses
+        vector<CAddress> vAddrOk;
         int64 nNow = GetAdjustedTime();
         int64 nSince = nNow - 10 * 60;
         BOOST_FOREACH(CAddress& addr, vAddr)
         {
             if (fShutdown)
                 return true;
-            // ignore IPv6 for now, since it isn't implemented anyway
-            if (!addr.IsIPv4())
-                continue;
             if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60)
                 addr.nTime = nNow - 5 * 24 * 60 * 60;
             pfrom->AddAddressKnown(addr);
+            bool fReachable = IsReachable(addr);
             if (addr.nTime > nSince && !pfrom->fGetAddr && vAddr.size() <= 10 && addr.IsRoutable())
             {
                 // Relay to a limited number of other nodes
@@ -2455,13 +2454,16 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
                         hashKey = Hash(BEGIN(hashKey), END(hashKey));
                         mapMix.insert(make_pair(hashKey, pnode));
                     }
-                    int nRelayNodes = 2;
+                    int nRelayNodes = fReachable ? 2 : 1; // limited relaying of addresses outside our network(s)
                     for (multimap<uint256, CNode*>::iterator mi = mapMix.begin(); mi != mapMix.end() && nRelayNodes-- > 0; ++mi)
                         ((*mi).second)->PushAddress(addr);
                 }
             }
+            // Do not store addresses outside our network
+            if (fReachable)
+                vAddrOk.push_back(addr);
         }
-        addrman.Add(vAddr, pfrom->addr, 2 * 60 * 60);
+        addrman.Add(vAddrOk, pfrom->addr, 2 * 60 * 60);
         if (vAddr.size() < 1000)
             pfrom->fGetAddr = false;
         if (pfrom->fOneShot)
diff --git a/src/makefile.linux-mingw b/src/makefile.linux-mingw
index cc33bc0bc2..1df1e28f1d 100644
--- a/src/makefile.linux-mingw
+++ b/src/makefile.linux-mingw
@@ -27,7 +27,7 @@ LIBS= \
  -l ssl \
  -l crypto
 
-DEFS=-D_MT -DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB
+DEFS=-D_MT -DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB -DUSE_IPV6
 DEBUGFLAGS=-g
 CFLAGS=-O2 -w -Wall -Wextra -Wformat -Wformat-security -Wno-unused-parameter $(DEBUGFLAGS) $(DEFS) $(INCLUDEPATHS)
 
diff --git a/src/makefile.mingw b/src/makefile.mingw
index 27d2756506..47bf8d5304 100644
--- a/src/makefile.mingw
+++ b/src/makefile.mingw
@@ -23,7 +23,7 @@ LIBS= \
  -l ssl \
  -l crypto
 
-DEFS=-DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB
+DEFS=-DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB -DUSE_IPV6
 DEBUGFLAGS=-g
 CFLAGS=-mthreads -O2 -w -Wall -Wextra -Wformat -Wformat-security -Wno-unused-parameter $(DEBUGFLAGS) $(DEFS) $(INCLUDEPATHS)
 
diff --git a/src/makefile.osx b/src/makefile.osx
index b3afaa8e34..c927330c9c 100644
--- a/src/makefile.osx
+++ b/src/makefile.osx
@@ -53,7 +53,7 @@ LIBS += \
 TESTDEFS += -DBOOST_TEST_DYN_LINK
 endif
 
-DEFS=-DMAC_OSX -DMSG_NOSIGNAL=0
+DEFS=-DMAC_OSX -DMSG_NOSIGNAL=0 -DUSE_IPV6
 
 ifdef RELEASE
 # Compile for maximum compatibility and smallest size.
diff --git a/src/makefile.unix b/src/makefile.unix
index 5cbf45e98c..ad0a82df50 100644
--- a/src/makefile.unix
+++ b/src/makefile.unix
@@ -4,7 +4,7 @@
 
 USE_UPNP:=0
 
-DEFS=
+DEFS=-DUSE_IPV6
 
 DEFS += $(addprefix -I,$(CURDIR) $(CURDIR)/obj $(BOOST_INCLUDE_PATH) $(BDB_INCLUDE_PATH) $(OPENSSL_INCLUDE_PATH))
 LIBS = $(addprefix -L,$(BOOST_LIB_PATH) $(BDB_LIB_PATH) $(OPENSSL_LIB_PATH))
diff --git a/src/net.cpp b/src/net.cpp
index ccaaee4615..f12afb78e6 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -45,12 +45,14 @@ bool OpenNetworkConnection(const CAddress& addrConnect, CSemaphoreGrant *grantOu
 bool fClient = false;
 static bool fUseUPnP = false;
 uint64 nLocalServices = (fClient ? 0 : NODE_NETWORK);
-CCriticalSection cs_mapLocalHost;
-map<CNetAddr, int> mapLocalHost;
+static CCriticalSection cs_mapLocalHost;
+static map<CService, int> mapLocalHost;
+static bool vfReachable[NET_MAX] = {};
+static bool vfLimited[NET_MAX] = {};
 static CNode* pnodeLocalHost = NULL;
 uint64 nLocalHostNonce = 0;
 array<int, THREAD_MAX> vnThreadsRunning;
-static SOCKET hListenSocket = INVALID_SOCKET;
+static std::vector<SOCKET> vhListenSocket;
 CAddrMan addrman;
 
 vector<CNode*> vNodes;
@@ -91,7 +93,7 @@ void CNode::PushGetBlocks(CBlockIndex* pindexBegin, uint256 hashEnd)
 }
 
 // find 'best' local address for a particular peer
-bool GetLocal(CNetAddr& addr, const CNetAddr *paddrPeer)
+bool GetLocal(CService& addr, const CNetAddr *paddrPeer)
 {
     if (fUseProxy || mapArgs.count("-connect") || fNoListen)
         return false;
@@ -100,7 +102,7 @@ bool GetLocal(CNetAddr& addr, const CNetAddr *paddrPeer)
     int nBestReachability = -1;
     {
         LOCK(cs_mapLocalHost);
-        for (map<CNetAddr, int>::iterator it = mapLocalHost.begin(); it != mapLocalHost.end(); it++)
+        for (map<CService, int>::iterator it = mapLocalHost.begin(); it != mapLocalHost.end(); it++)
         {
             int nCount = (*it).second;
             int nReachability = (*it).first.GetReachabilityFrom(paddrPeer);
@@ -119,11 +121,10 @@ bool GetLocal(CNetAddr& addr, const CNetAddr *paddrPeer)
 CAddress GetLocalAddress(const CNetAddr *paddrPeer)
 {
     CAddress ret(CService("0.0.0.0",0),0);
-    CNetAddr addr;
+    CService addr;
     if (GetLocal(addr, paddrPeer))
     {
-        ret.SetIP(addr);
-        ret.SetPort(GetListenPort());
+        ret = CAddress(addr);
         ret.nServices = nLocalServices;
         ret.nTime = GetAdjustedTime();
     }
@@ -191,7 +192,7 @@ void static AdvertizeLocal()
         if (pnode->fSuccessfullyConnected)
         {
             CAddress addrLocal = GetLocalAddress(&pnode->addr);
-            if (addrLocal.IsRoutable() && (CNetAddr)addrLocal != (CNetAddr)pnode->addrLocal)
+            if (addrLocal.IsRoutable() && (CService)addrLocal != (CService)pnode->addrLocal)
             {
                 pnode->PushAddress(addrLocal);
                 pnode->addrLocal = addrLocal;
@@ -201,7 +202,7 @@ void static AdvertizeLocal()
 }
 
 // learn a new local address
-bool AddLocal(const CNetAddr& addr, int nScore)
+bool AddLocal(const CService& addr, int nScore)
 {
     if (!addr.IsRoutable())
         return false;
@@ -211,6 +212,9 @@ bool AddLocal(const CNetAddr& addr, int nScore)
     {
         LOCK(cs_mapLocalHost);
         mapLocalHost[addr] = std::max(nScore, mapLocalHost[addr]) + (mapLocalHost.count(addr) ? 1 : 0);
+        enum Network net = addr.GetNetwork();
+        vfReachable[net] = true;
+        if (net == NET_IPV6) vfReachable[NET_IPV4] = true;
     }
 
     AdvertizeLocal();
@@ -218,8 +222,28 @@ bool AddLocal(const CNetAddr& addr, int nScore)
     return true;
 }
 
-// vote for a local address
-bool SeenLocal(const CNetAddr& addr)
+bool AddLocal(const CNetAddr& addr, int nScore, int port)
+{
+    if (port == -1)
+        port = GetListenPort();
+    return AddLocal(CService(addr, port), nScore);
+}
+
+/** Make a particular network entirely off-limits (no automatic connects to it) */
+void SetLimited(enum Network net, bool fLimited)
+{
+    LOCK(cs_mapLocalHost);
+    vfLimited[net] = fLimited;
+}
+
+bool IsLimited(const CNetAddr& addr)
+{
+    LOCK(cs_mapLocalHost);
+    return vfLimited[addr.GetNetwork()];
+}
+
+/** vote for a local address */
+bool SeenLocal(const CService& addr)
 {
     {
         LOCK(cs_mapLocalHost);
@@ -233,13 +257,20 @@ bool SeenLocal(const CNetAddr& addr)
     return true;
 }
 
-// check whether a given address is potentially local
-bool IsLocal(const CNetAddr& addr)
+/** check whether a given address is potentially local */
+bool IsLocal(const CService& addr)
 {
     LOCK(cs_mapLocalHost);
     return mapLocalHost.count(addr) > 0;
 }
 
+/** check whether a given address is in a network we can probably connect to */
+bool IsReachable(const CNetAddr& addr)
+{
+    LOCK(cs_mapLocalHost);
+    enum Network net = addr.GetNetwork();
+    return vfReachable[net] && !vfLimited[net];
+}
 
 bool GetMyExternalIP2(const CService& addrConnect, const char* pszGet, const char* pszKeyword, CNetAddr& ipRet)
 {
@@ -675,9 +706,10 @@ void ThreadSocketHandler2(void* parg)
         FD_ZERO(&fdsetError);
         SOCKET hSocketMax = 0;
 
-        if(hListenSocket != INVALID_SOCKET)
+        BOOST_FOREACH(SOCKET hListenSocket, vhListenSocket) {
             FD_SET(hListenSocket, &fdsetRecv);
-        hSocketMax = max(hSocketMax, hListenSocket);
+            hSocketMax = max(hSocketMax, hListenSocket);
+        }
         {
             LOCK(cs_vNodes);
             BOOST_FOREACH(CNode* pnode, vNodes)
@@ -718,16 +750,22 @@ void ThreadSocketHandler2(void* parg)
         //
         // Accept new connections
         //
+        BOOST_FOREACH(SOCKET hListenSocket, vhListenSocket)
         if (hListenSocket != INVALID_SOCKET && FD_ISSET(hListenSocket, &fdsetRecv))
         {
-            struct sockaddr_in sockaddr;
+#ifdef USE_IPV6
+            struct sockaddr_storage sockaddr;
+#else
+            struct sockaddr sockaddr;
+#endif
             socklen_t len = sizeof(sockaddr);
             SOCKET hSocket = accept(hListenSocket, (struct sockaddr*)&sockaddr, &len);
             CAddress addr;
             int nInbound = 0;
 
             if (hSocket != INVALID_SOCKET)
-                addr = CAddress(sockaddr);
+                if (!addr.SetSockAddr((const struct sockaddr*)&sockaddr))
+                    printf("warning: unknown socket family\n");
 
             {
                 LOCK(cs_vNodes);
@@ -1380,11 +1418,14 @@ void ThreadOpenConnections2(void* parg)
             CAddress addr = addrman.Select(10 + min(nOutbound,8)*10);
 
             // if we selected an invalid address, restart
-            if (!addr.IsIPv4() || !addr.IsValid() || setConnected.count(addr.GetGroup()) || IsLocal(addr))
+            if (!addr.IsValid() || setConnected.count(addr.GetGroup()) || IsLocal(addr))
                 break;
 
             nTries++;
 
+            if (IsLimited(addr))
+                continue;
+
             // only consider very recently tried nodes after 30 failed attempts
             if (nANow - addr.nLastTry < 600 && nTries < 30)
                 continue;
@@ -1613,7 +1654,7 @@ void ThreadMessageHandler2(void* parg)
 
 
 
-bool BindListenPort(string& strError)
+bool BindListenPort(const CService &addrBind, string& strError)
 {
     strError = "";
     int nOne = 1;
@@ -1631,7 +1672,20 @@ bool BindListenPort(string& strError)
 #endif
 
     // Create socket for listening for incoming connections
-    hListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+#ifdef USE_IPV6
+    struct sockaddr_storage sockaddr;
+#else
+    struct sockaddr sockaddr;
+#endif
+    socklen_t len = sizeof(sockaddr);
+    if (!addrBind.GetSockAddr((struct sockaddr*)&sockaddr, &len))
+    {
+        strError = strprintf("Error: bind address family for %s not supported", addrBind.ToString().c_str());
+        printf("%s\n", strError.c_str());
+        return false;
+    }
+
+    SOCKET hListenSocket = socket(((struct sockaddr*)&sockaddr)->sa_family, SOCK_STREAM, IPPROTO_TCP);
     if (hListenSocket == INVALID_SOCKET)
     {
         strError = strprintf("Error: Couldn't open socket for incoming connections (socket returned error %d)", WSAGetLastError());
@@ -1650,6 +1704,7 @@ bool BindListenPort(string& strError)
     setsockopt(hListenSocket, SOL_SOCKET, SO_REUSEADDR, (void*)&nOne, sizeof(int));
 #endif
 
+
 #ifdef WIN32
     // Set to nonblocking, incoming connections will also inherit this
     if (ioctlsocket(hListenSocket, FIONBIO, (u_long*)&nOne) == SOCKET_ERROR)
@@ -1662,24 +1717,33 @@ bool BindListenPort(string& strError)
         return false;
     }
 
-    // The sockaddr_in structure specifies the address family,
-    // IP address, and port for the socket that is being bound
-    struct sockaddr_in sockaddr;
-    memset(&sockaddr, 0, sizeof(sockaddr));
-    sockaddr.sin_family = AF_INET;
-    sockaddr.sin_addr.s_addr = INADDR_ANY; // bind to all IPs on this computer
-    sockaddr.sin_port = htons(GetListenPort());
-    if (::bind(hListenSocket, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) == SOCKET_ERROR)
+#ifdef USE_IPV6
+    // some systems don't have IPV6_V6ONLY but are always v6only; others do have the option
+    // and enable it by default or not. Try to enable it, if possible.
+    if (addrBind.IsIPv6()) {
+#ifdef IPV6_V6ONLY
+        setsockopt(hListenSocket, IPPROTO_IPV6, IPV6_V6ONLY, (void*)&nOne, sizeof(int));
+#endif
+#ifdef WIN32
+        int nProtLevel = 10 /* PROTECTION_LEVEL_UNRESTRICTED */;
+        int nParameterId = 23 /* IPV6_PROTECTION_LEVEl */;
+        // this call is allowed to fail
+        setsockopt(hListenSocket, IPPROTO_IPV6, nParameterId, (const char*)&nProtLevel, sizeof(int));
+#endif
+    }
+#endif
+
+    if (::bind(hListenSocket, (struct sockaddr*)&sockaddr, len) == SOCKET_ERROR)
     {
         int nErr = WSAGetLastError();
         if (nErr == WSAEADDRINUSE)
-            strError = strprintf(_("Unable to bind to port %d on this computer.  Bitcoin is probably already running."), ntohs(sockaddr.sin_port));
+            strError = strprintf(_("Unable to bind to %s on this computer.  Bitcoin is probably already running."), addrBind.ToString().c_str());
         else
-            strError = strprintf("Error: Unable to bind to port %d on this computer (bind returned error %d)", ntohs(sockaddr.sin_port), nErr);
+            strError = strprintf(_("Unable to bind to %s on this computer (bind returned error %d, %s)"), addrBind.ToString().c_str(), nErr, strerror(nErr));
         printf("%s\n", strError.c_str());
         return false;
     }
-    printf("Bound to port %d\n", ntohs(sockaddr.sin_port));
+    printf("Bound to %s\n", addrBind.ToString().c_str());
 
     // Listen for incoming connections
     if (listen(hListenSocket, SOMAXCONN) == SOCKET_ERROR)
@@ -1689,6 +1753,11 @@ bool BindListenPort(string& strError)
         return false;
     }
 
+    vhListenSocket.push_back(hListenSocket);
+
+    if (addrBind.IsRoutable() && GetBoolArg("-discover", true))
+        AddLocal(addrBind, LOCAL_BIND);
+
     return true;
 }
 
@@ -1722,28 +1791,22 @@ void static Discover()
             if ((ifa->ifa_flags & IFF_UP) == 0) continue;
             if (strcmp(ifa->ifa_name, "lo") == 0) continue;
             if (strcmp(ifa->ifa_name, "lo0") == 0) continue;
-            char pszIP[100];
             if (ifa->ifa_addr->sa_family == AF_INET)
             {
                 struct sockaddr_in* s4 = (struct sockaddr_in*)(ifa->ifa_addr);
-                if (inet_ntop(ifa->ifa_addr->sa_family, (void*)&(s4->sin_addr), pszIP, sizeof(pszIP)) != NULL)
-                    printf("ipv4 %s: %s\n", ifa->ifa_name, pszIP);
-
-                // Take the first IP that isn't loopback 127.x.x.x
                 CNetAddr addr(s4->sin_addr);
-                AddLocal(addr, LOCAL_IF);
+                if (AddLocal(addr, LOCAL_IF))
+                    printf("ipv4 %s: %s\n", ifa->ifa_name, addr.ToString().c_str());
             }
+#ifdef USE_IPV6
             else if (ifa->ifa_addr->sa_family == AF_INET6)
             {
                 struct sockaddr_in6* s6 = (struct sockaddr_in6*)(ifa->ifa_addr);
-                if (inet_ntop(ifa->ifa_addr->sa_family, (void*)&(s6->sin6_addr), pszIP, sizeof(pszIP)) != NULL)
-                    printf("ipv6 %s: %s\n", ifa->ifa_name, pszIP);
-
-#ifdef USE_IPV6
                 CNetAddr addr(s6->sin6_addr);
-                AddLocal(addr, LOCAL_IF);
-#endif
+                if (AddLocal(addr, LOCAL_IF))
+                    printf("ipv6 %s: %s\n", ifa->ifa_name, addr.ToString().c_str());
             }
+#endif
         }
         freeifaddrs(myaddrs);
     }
@@ -1866,9 +1929,10 @@ public:
         BOOST_FOREACH(CNode* pnode, vNodes)
             if (pnode->hSocket != INVALID_SOCKET)
                 closesocket(pnode->hSocket);
-        if (hListenSocket != INVALID_SOCKET)
-            if (closesocket(hListenSocket) == SOCKET_ERROR)
-                printf("closesocket(hListenSocket) failed with error %d\n", WSAGetLastError());
+        BOOST_FOREACH(SOCKET hListenSocket, vhListenSocket)
+            if (hListenSocket != INVALID_SOCKET)
+                if (closesocket(hListenSocket) == SOCKET_ERROR)
+                    printf("closesocket(hListenSocket) failed with error %d\n", WSAGetLastError());
 
 #ifdef WIN32
         // Shutdown Windows Sockets
diff --git a/src/net.h b/src/net.h
index 3521a81388..8fe8c0047d 100644
--- a/src/net.h
+++ b/src/net.h
@@ -38,28 +38,34 @@ CNode* FindNode(const CNetAddr& ip);
 CNode* FindNode(const CService& ip);
 CNode* ConnectNode(CAddress addrConnect, const char *strDest = NULL, int64 nTimeout=0);
 void MapPort(bool fMapPort);
-bool BindListenPort(std::string& strError=REF(std::string()));
+bool BindListenPort(const CService &bindAddr, std::string& strError=REF(std::string()));
 void StartNode(void* parg);
 bool StopNode();
 
 enum
 {
-    LOCAL_NONE,
-    LOCAL_IF,
-    LOCAL_UPNP,
-    LOCAL_IRC,
-    LOCAL_HTTP,
-    LOCAL_MANUAL,
+    LOCAL_NONE,   // unknown
+    LOCAL_IF,     // address a local interface listens on
+    LOCAL_BIND,   // address explicit bound to
+    LOCAL_UPNP,   // address reported by UPnP
+    LOCAL_IRC,    // address reported by IRC (deprecated)
+    LOCAL_HTTP,   // address reported by whatismyip.com and similars
+    LOCAL_MANUAL, // address explicitly specified (-externalip=)
 
     LOCAL_MAX
 };
 
-bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE);
-bool SeenLocal(const CNetAddr& addr);
-bool IsLocal(const CNetAddr& addr);
-bool GetLocal(CNetAddr &addr, const CNetAddr *paddrPeer = NULL);
+void SetLimited(enum Network net, bool fLimited = true);
+bool IsLimited(const CNetAddr& addr);
+bool AddLocal(const CService& addr, int nScore = LOCAL_NONE);
+bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE, int port = -1);
+bool SeenLocal(const CService& addr);
+bool IsLocal(const CService& addr);
+bool GetLocal(CService &addr, const CNetAddr *paddrPeer = NULL);
+bool IsReachable(const CNetAddr &addr);
 CAddress GetLocalAddress(const CNetAddr *paddrPeer = NULL);
 
+
 enum
 {
     MSG_TX = 1,
@@ -139,7 +145,7 @@ public:
     unsigned int nMessageStart;
     CAddress addr;
     std::string addrName;
-    CNetAddr addrLocal;
+    CService addrLocal;
     int nVersion;
     std::string strSubVer;
     bool fOneShot;
diff --git a/src/netbase.cpp b/src/netbase.cpp
index 48709dc5c6..ebf823e899 100644
--- a/src/netbase.cpp
+++ b/src/netbase.cpp
@@ -21,10 +21,24 @@ bool fProxyNameLookup = false;
 bool fNameLookup = false;
 CService addrProxy("127.0.0.1",9050);
 int nConnectTimeout = 5000;
+static bool vfNoProxy[NET_MAX] = {};
 
 
 static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };
 
+enum Network ParseNetwork(std::string net) {
+    if (net == "ipv4") return NET_IPV4;
+    if (net == "ipv6") return NET_IPV6;
+    if (net == "tor")  return NET_TOR;
+    if (net == "i2p")  return NET_I2P;
+    return NET_UNROUTABLE;
+}
+
+void SetNoProxy(enum Network net, bool fNoProxy) {
+    assert(net >= 0 && net < NET_MAX);
+    vfNoProxy[net] = fNoProxy;
+}
+
 bool static LookupIntern(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions, bool fAllowLookup)
 {
     vIP.clear();
@@ -169,7 +183,12 @@ bool static Socks4(const CService &addrDest, SOCKET& hSocket)
     }
     char pszSocks4IP[] = "\4\1\0\0\0\0\0\0user";
     struct sockaddr_in addr;
-    addrDest.GetSockAddr(&addr);
+    socklen_t len = sizeof(addr);
+    if (!addrDest.GetSockAddr((struct sockaddr*)&addr, &len) || addr.sin_family != AF_INET)
+    {
+        closesocket(hSocket);
+        return error("Cannot get proxy destination address");
+    }
     memcpy(pszSocks4IP + 2, &addr.sin_port, 2);
     memcpy(pszSocks4IP + 4, &addr.sin_addr, 4);
     char* pszSocks4 = pszSocks4IP;
@@ -305,7 +324,18 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
 {
     hSocketRet = INVALID_SOCKET;
 
-    SOCKET hSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+#ifdef USE_IPV6
+    struct sockaddr_storage sockaddr;
+#else
+    struct sockaddr sockaddr;
+#endif
+    socklen_t len = sizeof(sockaddr);
+    if (!addrConnect.GetSockAddr((struct sockaddr*)&sockaddr, &len)) {
+        printf("Cannot connect to %s: unsupported network\n", addrConnect.ToString().c_str());
+        return false;
+    }
+
+    SOCKET hSocket = socket(((struct sockaddr*)&sockaddr)->sa_family, SOCK_STREAM, IPPROTO_TCP);
     if (hSocket == INVALID_SOCKET)
         return false;
 #ifdef SO_NOSIGPIPE
@@ -313,13 +343,6 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
     setsockopt(hSocket, SOL_SOCKET, SO_NOSIGPIPE, (void*)&set, sizeof(int));
 #endif
 
-    struct sockaddr_in sockaddr;
-    if (!addrConnect.GetSockAddr(&sockaddr))
-    {
-        closesocket(hSocket);
-        return false;
-    }
-
 #ifdef WIN32
     u_long fNonblock = 1;
     if (ioctlsocket(hSocket, FIONBIO, &fNonblock) == SOCKET_ERROR)
@@ -332,7 +355,7 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
         return false;
     }
 
-    if (connect(hSocket, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) == SOCKET_ERROR)
+    if (connect(hSocket, (struct sockaddr*)&sockaddr, len) == SOCKET_ERROR)
     {
         // WSAEINVAL is here because some legacy version of winsock uses it
         if (WSAGetLastError() == WSAEINPROGRESS || WSAGetLastError() == WSAEWOULDBLOCK || WSAGetLastError() == WSAEINVAL)
@@ -409,7 +432,7 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
 bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout)
 {
     SOCKET hSocket = INVALID_SOCKET;
-    bool fProxy = (fUseProxy && addrDest.IsRoutable());
+    bool fProxy = (fUseProxy && addrDest.IsRoutable() && !vfNoProxy[addrDest.GetNetwork()]);
 
     if (!ConnectSocketDirectly(fProxy ? addrProxy : addrDest, hSocket, nTimeout))
         return false;
@@ -531,6 +554,11 @@ bool CNetAddr::IsIPv4() const
     return (memcmp(ip, pchIPv4, sizeof(pchIPv4)) == 0);
 }
 
+bool CNetAddr::IsIPv6() const
+{
+    return (!IsIPv4());
+}
+
 bool CNetAddr::IsRFC1918() const
 {
     return IsIPv4() && (
@@ -587,6 +615,18 @@ bool CNetAddr::IsRFC4843() const
     return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x10);
 }
 
+bool CNetAddr::IsOnionCat() const
+{
+    static const unsigned char pchOnionCat[] = {0xFD,0x87,0xD8,0x7E,0xEB,0x43};
+    return (memcmp(ip, pchOnionCat, sizeof(pchOnionCat)) == 0);
+}
+
+bool CNetAddr::IsGarliCat() const
+{
+    static const unsigned char pchGarliCat[] = {0xFD,0x60,0xDB,0x4D,0xDD,0xB5};
+    return (memcmp(ip, pchGarliCat, sizeof(pchGarliCat)) == 0);
+}
+
 bool CNetAddr::IsLocal() const
 {
     // IPv4 loopback
@@ -645,7 +685,24 @@ bool CNetAddr::IsValid() const
 
 bool CNetAddr::IsRoutable() const
 {
-    return IsValid() && !(IsRFC1918() || IsRFC3927() || IsRFC4862() || IsRFC4193() || IsRFC4843() || IsLocal());
+    return IsValid() && !(IsRFC1918() || IsRFC3927() || IsRFC4862() || (IsRFC4193() && !IsOnionCat() && !IsGarliCat()) || IsRFC4843() || IsLocal());
+}
+
+enum Network CNetAddr::GetNetwork() const
+{
+    if (!IsRoutable())
+        return NET_UNROUTABLE;
+
+    if (IsIPv4())
+        return NET_IPV4;
+
+    if (IsOnionCat())
+        return NET_TOR;
+
+    if (IsGarliCat())
+        return NET_I2P;
+
+    return NET_IPV6;
 }
 
 std::string CNetAddr::ToStringIP() const
@@ -701,40 +758,40 @@ bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const
 std::vector<unsigned char> CNetAddr::GetGroup() const
 {
     std::vector<unsigned char> vchRet;
-    int nClass = 0; // 0=IPv6, 1=IPv4, 254=local, 255=unroutable
+    int nClass = NET_IPV6;
     int nStartByte = 0;
     int nBits = 16;
 
     // all local addresses belong to the same group
     if (IsLocal())
     {
-        nClass = 254;
+        nClass = 255;
         nBits = 0;
     }
 
     // all unroutable addresses belong to the same group
     if (!IsRoutable())
     {
-        nClass = 255;
+        nClass = NET_UNROUTABLE;
         nBits = 0;
     }
     // for IPv4 addresses, '1' + the 16 higher-order bits of the IP
     // includes mapped IPv4, SIIT translated IPv4, and the well-known prefix
     else if (IsIPv4() || IsRFC6145() || IsRFC6052())
     {
-        nClass = 1;
+        nClass = NET_IPV4;
         nStartByte = 12;
     }
     // for 6to4 tunneled addresses, use the encapsulated IPv4 address
     else if (IsRFC3964())
     {
-        nClass = 1;
+        nClass = NET_IPV4;
         nStartByte = 2;
     }
     // for Teredo-tunneled IPv6 addresses, use the encapsulated IPv4 address
     else if (IsRFC4380())
     {
-        vchRet.push_back(1);
+        vchRet.push_back(NET_IPV4);
         vchRet.push_back(GetByte(3) ^ 0xFF);
         vchRet.push_back(GetByte(2) ^ 0xFF);
         return vchRet;
@@ -831,6 +888,22 @@ CService::CService(const struct sockaddr_in6 &addr) : CNetAddr(addr.sin6_addr),
 }
 #endif
 
+bool CService::SetSockAddr(const struct sockaddr *paddr)
+{
+    switch (paddr->sa_family) {
+    case AF_INET:
+        *this = CService(*(const struct sockaddr_in*)paddr);
+        return true;
+#ifdef USE_IPV6
+    case AF_INET6:
+        *this = CService(*(const struct sockaddr_in6*)paddr);
+        return true;
+#endif
+    default:
+        return false;
+    }
+}
+
 CService::CService(const char *pszIpPort, bool fAllowLookup)
 {
     Init();
@@ -883,29 +956,36 @@ bool operator<(const CService& a, const CService& b)
     return (CNetAddr)a < (CNetAddr)b || ((CNetAddr)a == (CNetAddr)b && a.port < b.port);
 }
 
-bool CService::GetSockAddr(struct sockaddr_in* paddr) const
+bool CService::GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const
 {
-    if (!IsIPv4())
-        return false;
-    memset(paddr, 0, sizeof(struct sockaddr_in));
-    if (!GetInAddr(&paddr->sin_addr))
-        return false;
-    paddr->sin_family = AF_INET;
-    paddr->sin_port = htons(port);
-    return true;
-}
-
+    if (IsIPv4()) {
+        if (*addrlen < sizeof(struct sockaddr_in))
+            return false;
+        *addrlen = sizeof(struct sockaddr_in);
+        struct sockaddr_in *paddrin = (struct sockaddr_in*)paddr;
+        memset(paddrin, 0, *addrlen);
+        if (!GetInAddr(&paddrin->sin_addr))
+            return false;
+        paddrin->sin_family = AF_INET;
+        paddrin->sin_port = htons(port);
+        return true;
+    }
 #ifdef USE_IPV6
-bool CService::GetSockAddr6(struct sockaddr_in6* paddr) const
-{
-    memset(paddr, 0, sizeof(struct sockaddr_in6));
-    if (!GetIn6Addr(&paddr->sin6_addr))
-        return false;
-    paddr->sin6_family = AF_INET6;
-    paddr->sin6_port = htons(port);
-    return true;
-}
+    if (IsIPv6()) {
+        if (*addrlen < sizeof(struct sockaddr_in6))
+            return false;
+        *addrlen = sizeof(struct sockaddr_in6);
+        struct sockaddr_in6 *paddrin6 = (struct sockaddr_in6*)paddr;
+        memset(paddrin6, 0, *addrlen);
+        if (!GetIn6Addr(&paddrin6->sin6_addr))
+            return false;
+        paddrin6->sin6_family = AF_INET6;
+        paddrin6->sin6_port = htons(port);
+        return true;
+    }
 #endif
+    return false;
+}
 
 std::vector<unsigned char> CService::GetKey() const
 {
@@ -919,12 +999,16 @@ std::vector<unsigned char> CService::GetKey() const
 
 std::string CService::ToStringPort() const
 {
-    return strprintf(":%i", port);
+    return strprintf("%i", port);
 }
 
 std::string CService::ToStringIPPort() const
 {
-    return ToStringIP() + ToStringPort();
+    if (IsIPv4()) {
+        return ToStringIP() + ":" + ToStringPort();
+    } else {
+        return "[" + ToStringIP() + "]:" + ToStringPort();
+    }
 }
 
 std::string CService::ToString() const
diff --git a/src/netbase.h b/src/netbase.h
index e5c466e4f0..514a1ae950 100644
--- a/src/netbase.h
+++ b/src/netbase.h
@@ -17,6 +17,20 @@ extern int nConnectTimeout;
 #undef SetPort
 #endif
 
+enum Network
+{
+    NET_UNROUTABLE,
+    NET_IPV4,
+    NET_IPV6,
+    NET_TOR,
+    NET_I2P,
+
+    NET_MAX
+};
+
+enum Network ParseNetwork(std::string net);
+void SetNoProxy(enum Network net, bool fNoProxy = true);
+
 /** IP address (IPv6, or IPv4 using mapped IPv6 range (::FFFF:0:0/96)) */
 class CNetAddr
 {
@@ -31,6 +45,7 @@ class CNetAddr
         void Init();
         void SetIP(const CNetAddr& ip);
         bool IsIPv4() const;    // IPv4 mapped address (::FFFF:0:0/96, 0.0.0.0/0)
+        bool IsIPv6() const;    // IPv6 address (not IPv4)
         bool IsRFC1918() const; // IPv4 private networks (10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12)
         bool IsRFC3849() const; // IPv6 documentation address (2001:0DB8::/32)
         bool IsRFC3927() const; // IPv4 autoconfig (169.254.0.0/16)
@@ -41,10 +56,13 @@ class CNetAddr
         bool IsRFC4862() const; // IPv6 autoconfig (FE80::/64)
         bool IsRFC6052() const; // IPv6 well-known prefix (64:FF9B::/96)
         bool IsRFC6145() const; // IPv6 IPv4-translated address (::FFFF:0:0:0/96)
+        bool IsOnionCat() const;
+        bool IsGarliCat() const;
         bool IsLocal() const;
         bool IsRoutable() const;
         bool IsValid() const;
         bool IsMulticast() const;
+        enum Network GetNetwork() const;
         std::string ToString() const;
         std::string ToStringIP() const;
         int GetByte(int n) const;
@@ -87,7 +105,8 @@ class CService : public CNetAddr
         void Init();
         void SetPort(unsigned short portIn);
         unsigned short GetPort() const;
-        bool GetSockAddr(struct sockaddr_in* paddr) const;
+        bool GetSockAddr(struct sockaddr* paddr, socklen_t *addrlen) const;
+        bool SetSockAddr(const struct sockaddr* paddr);
         friend bool operator==(const CService& a, const CService& b);
         friend bool operator!=(const CService& a, const CService& b);
         friend bool operator<(const CService& a, const CService& b);
@@ -99,7 +118,6 @@ class CService : public CNetAddr
 
 #ifdef USE_IPV6
         CService(const struct in6_addr& ipv6Addr, unsigned short port);
-        bool GetSockAddr6(struct sockaddr_in6* paddr) const;
         CService(const struct sockaddr_in6& addr);
 #endif