remove SOCKS4 support from core and GUI

- now we support SOCKS5 only

9 files changed, 47 insertions, 172 deletions

diff --git a/src/init.cpp b/src/init.cpp
index c514facbbe..a92d2aad67 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -238,9 +238,8 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += "  -onion=<ip:port>       " + _("Use separate SOCKS5 proxy to reach peers via Tor hidden services (default: -proxy)") + "\n";
     strUsage += "  -onlynet=<net>         " + _("Only connect to nodes in network <net> (IPv4, IPv6 or Tor)") + "\n";
     strUsage += "  -port=<port>           " + _("Listen for connections on <port> (default: 8333 or testnet: 18333)") + "\n";
-    strUsage += "  -proxy=<ip:port>       " + _("Connect through SOCKS proxy") + "\n";
+    strUsage += "  -proxy=<ip:port>       " + _("Connect through SOCKS5 proxy") + "\n";
     strUsage += "  -seednode=<ip>         " + _("Connect to a node to retrieve peer addresses, and disconnect") + "\n";
-    strUsage += "  -socks=<n>             " + _("Select SOCKS version for -proxy (4 or 5, default: 5)") + "\n";
     strUsage += "  -timeout=<n>           " + _("Specify connection timeout in milliseconds (default: 5000)") + "\n";
 #ifdef USE_UPNP
 #if USE_UPNP
@@ -745,10 +744,6 @@ bool AppInit2(boost::thread_group& threadGroup)
 
     RegisterNodeSignals(GetNodeSignals());
 
-    int nSocksVersion = GetArg("-socks", 5);
-    if (nSocksVersion != 4 && nSocksVersion != 5)
-        return InitError(strprintf(_("Unknown -socks proxy version requested: %i"), nSocksVersion));
-
     if (mapArgs.count("-onlynet")) {
         std::set<enum Network> nets;
         BOOST_FOREACH(std::string snet, mapMultiArgs["-onlynet"]) {
@@ -772,12 +767,10 @@ bool AppInit2(boost::thread_group& threadGroup)
             return InitError(strprintf(_("Invalid -proxy address: '%s'"), mapArgs["-proxy"]));
 
         if (!IsLimited(NET_IPV4))
-            SetProxy(NET_IPV4, addrProxy, nSocksVersion);
-        if (nSocksVersion > 4) {
-            if (!IsLimited(NET_IPV6))
-                SetProxy(NET_IPV6, addrProxy, nSocksVersion);
-            SetNameProxy(addrProxy, nSocksVersion);
-        }
+            SetProxy(NET_IPV4, addrProxy);
+        if (!IsLimited(NET_IPV6))
+            SetProxy(NET_IPV6, addrProxy);
+        SetNameProxy(addrProxy);
         fProxy = true;
     }
 
@@ -791,7 +784,7 @@ bool AppInit2(boost::thread_group& threadGroup)
             addrOnion = CService(mapArgs["-onion"], 9050);
         if (!addrOnion.IsValid())
             return InitError(strprintf(_("Invalid -onion address: '%s'"), mapArgs["-onion"]));
-        SetProxy(NET_TOR, addrOnion, 5);
+        SetProxy(NET_TOR, addrOnion);
         SetReachable(NET_TOR);
     }
 
diff --git a/src/netbase.cpp b/src/netbase.cpp
index f47b0f3563..2567c4c780 100644
--- a/src/netbase.cpp
+++ b/src/netbase.cpp
@@ -37,7 +37,7 @@ using namespace std;
 
 // Settings
 static proxyType proxyInfo[NET_MAX];
-static proxyType nameproxyInfo;
+static CService nameProxy;
 static CCriticalSection cs_proxyInfos;
 int nConnectTimeout = 5000;
 bool fNameLookup = false;
@@ -214,50 +214,6 @@ bool LookupNumeric(const char *pszName, CService& addr, int portDefault)
     return Lookup(pszName, addr, portDefault, false);
 }
 
-bool static Socks4(const CService &addrDest, SOCKET& hSocket)
-{
-    LogPrintf("SOCKS4 connecting %s\n", addrDest.ToString());
-    if (!addrDest.IsIPv4())
-    {
-        closesocket(hSocket);
-        return error("Proxy destination is not IPv4");
-    }
-    char pszSocks4IP[] = "\4\1\0\0\0\0\0\0user";
-    struct sockaddr_in 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;
-    int nSize = sizeof(pszSocks4IP);
-
-    int ret = send(hSocket, pszSocks4, nSize, MSG_NOSIGNAL);
-    if (ret != nSize)
-    {
-        closesocket(hSocket);
-        return error("Error sending to proxy");
-    }
-    char pchRet[8];
-    if (recv(hSocket, pchRet, 8, 0) != 8)
-    {
-        closesocket(hSocket);
-        return error("Error reading proxy response");
-    }
-    if (pchRet[1] != 0x5a)
-    {
-        closesocket(hSocket);
-        if (pchRet[1] != 0x5b)
-            LogPrintf("ERROR: Proxy returned error %d\n", pchRet[1]);
-        return false;
-    }
-    LogPrintf("SOCKS4 connected %s\n", addrDest.ToString());
-    return true;
-}
-
 bool static Socks5(string strDest, int port, SOCKET& hSocket)
 {
     LogPrintf("SOCKS5 connecting %s\n", strDest);
@@ -468,53 +424,49 @@ bool static ConnectSocketDirectly(const CService &addrConnect, SOCKET& hSocketRe
     return true;
 }
 
-bool SetProxy(enum Network net, CService addrProxy, int nSocksVersion) {
+bool SetProxy(enum Network net, CService addrProxy) {
     assert(net >= 0 && net < NET_MAX);
-    if (nSocksVersion != 0 && nSocksVersion != 4 && nSocksVersion != 5)
-        return false;
-    if (nSocksVersion != 0 && !addrProxy.IsValid())
+    if (!addrProxy.IsValid())
         return false;
     LOCK(cs_proxyInfos);
-    proxyInfo[net] = std::make_pair(addrProxy, nSocksVersion);
+    proxyInfo[net] = addrProxy;
     return true;
 }
 
 bool GetProxy(enum Network net, proxyType &proxyInfoOut) {
     assert(net >= 0 && net < NET_MAX);
     LOCK(cs_proxyInfos);
-    if (!proxyInfo[net].second)
+    if (!proxyInfo[net].IsValid())
         return false;
     proxyInfoOut = proxyInfo[net];
     return true;
 }
 
-bool SetNameProxy(CService addrProxy, int nSocksVersion) {
-    if (nSocksVersion != 0 && nSocksVersion != 5)
-        return false;
-    if (nSocksVersion != 0 && !addrProxy.IsValid())
+bool SetNameProxy(CService addrProxy) {
+    if (!addrProxy.IsValid())
         return false;
     LOCK(cs_proxyInfos);
-    nameproxyInfo = std::make_pair(addrProxy, nSocksVersion);
+    nameProxy = addrProxy;
     return true;
 }
 
-bool GetNameProxy(proxyType &nameproxyInfoOut) {
+bool GetNameProxy(CService &nameProxyOut) {
     LOCK(cs_proxyInfos);
-    if (!nameproxyInfo.second)
+    if(!nameProxy.IsValid())
         return false;
-    nameproxyInfoOut = nameproxyInfo;
+    nameProxyOut = nameProxy;
     return true;
 }
 
 bool HaveNameProxy() {
     LOCK(cs_proxyInfos);
-    return nameproxyInfo.second != 0;
+    return nameProxy.IsValid();
 }
 
 bool IsProxy(const CNetAddr &addr) {
     LOCK(cs_proxyInfos);
     for (int i = 0; i < NET_MAX; i++) {
-        if (proxyInfo[i].second && (addr == (CNetAddr)proxyInfo[i].first))
+        if (addr == (CNetAddr)proxyInfo[i])
             return true;
     }
     return false;
@@ -523,31 +475,18 @@ bool IsProxy(const CNetAddr &addr) {
 bool ConnectSocket(const CService &addrDest, SOCKET& hSocketRet, int nTimeout)
 {
     proxyType proxy;
-
-    // no proxy needed
+    // no proxy needed (none set for target network)
     if (!GetProxy(addrDest.GetNetwork(), proxy))
         return ConnectSocketDirectly(addrDest, hSocketRet, nTimeout);
 
     SOCKET hSocket = INVALID_SOCKET;
 
     // first connect to proxy server
-    if (!ConnectSocketDirectly(proxy.first, hSocket, nTimeout))
+    if (!ConnectSocketDirectly(proxy, hSocket, nTimeout))
         return false;
-
     // do socks negotiation
-    switch (proxy.second) {
-    case 4:
-        if (!Socks4(addrDest, hSocket))
-            return false;
-        break;
-    case 5:
-        if (!Socks5(addrDest.ToStringIP(), addrDest.GetPort(), hSocket))
-            return false;
-        break;
-    default:
-        closesocket(hSocket);
+    if (!Socks5(addrDest.ToStringIP(), addrDest.GetPort(), hSocket))
         return false;
-    }
 
     hSocketRet = hSocket;
     return true;
@@ -561,30 +500,25 @@ bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest
 
     SOCKET hSocket = INVALID_SOCKET;
 
-    proxyType nameproxy;
-    GetNameProxy(nameproxy);
+    CService nameProxy;
+    GetNameProxy(nameProxy);
 
-    CService addrResolved(CNetAddr(strDest, fNameLookup && !nameproxy.second), port);
+    CService addrResolved(CNetAddr(strDest, fNameLookup && !HaveNameProxy()), port);
     if (addrResolved.IsValid()) {
         addr = addrResolved;
         return ConnectSocket(addr, hSocketRet, nTimeout);
     }
+
     addr = CService("0.0.0.0:0");
-    if (!nameproxy.second)
+
+    if (!HaveNameProxy())
         return false;
-    if (!ConnectSocketDirectly(nameproxy.first, hSocket, nTimeout))
+    // first connect to name proxy server
+    if (!ConnectSocketDirectly(nameProxy, hSocket, nTimeout))
+        return false;
+    // do socks negotiation
+    if (!Socks5(strDest, (unsigned short)port, hSocket))
         return false;
-
-    switch(nameproxy.second) {
-        default:
-        case 4:
-            closesocket(hSocket);
-            return false;
-        case 5:
-            if (!Socks5(strDest, port, hSocket))
-                return false;
-            break;
-    }
 
     hSocketRet = hSocket;
     return true;
diff --git a/src/netbase.h b/src/netbase.h
index 40a3d25676..ad1e230834 100644
--- a/src/netbase.h
+++ b/src/netbase.h
@@ -161,14 +161,14 @@ class CService : public CNetAddr
             )
 };
 
-typedef std::pair<CService, int> proxyType;
+typedef CService proxyType;
 
 enum Network ParseNetwork(std::string net);
 void SplitHostPort(std::string in, int &portOut, std::string &hostOut);
-bool SetProxy(enum Network net, CService addrProxy, int nSocksVersion = 5);
+bool SetProxy(enum Network net, CService addrProxy);
 bool GetProxy(enum Network net, proxyType &proxyInfoOut);
 bool IsProxy(const CNetAddr &addr);
-bool SetNameProxy(CService addrProxy, int nSocksVersion = 5);
+bool SetNameProxy(CService addrProxy);
 bool HaveNameProxy();
 bool LookupHost(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nMaxSolutions = 0, bool fAllowLookup = true);
 bool Lookup(const char *pszName, CService& addr, int portDefault = 0, bool fAllowLookup = true);
diff --git a/src/qt/forms/optionsdialog.ui b/src/qt/forms/optionsdialog.ui
index 0c5b8895aa..1f535a4a62 100644
--- a/src/qt/forms/optionsdialog.ui
+++ b/src/qt/forms/optionsdialog.ui
@@ -329,26 +329,6 @@
           </widget>
          </item>
          <item>
-          <widget class="QLabel" name="socksVersionLabel">
-           <property name="text">
-            <string>SOCKS &amp;Version:</string>
-           </property>
-           <property name="textFormat">
-            <enum>Qt::PlainText</enum>
-           </property>
-           <property name="buddy">
-            <cstring>socksVersion</cstring>
-           </property>
-          </widget>
-         </item>
-         <item>
-          <widget class="QValueComboBox" name="socksVersion">
-           <property name="toolTip">
-            <string>SOCKS version of the proxy (e.g. 5)</string>
-           </property>
-          </widget>
-         </item>
-         <item>
           <spacer name="horizontalSpacer_1_Network">
            <property name="orientation">
             <enum>Qt::Horizontal</enum>
diff --git a/src/qt/optionsdialog.cpp b/src/qt/optionsdialog.cpp
index 9502dba904..597be40abd 100644
--- a/src/qt/optionsdialog.cpp
+++ b/src/qt/optionsdialog.cpp
@@ -52,15 +52,8 @@ OptionsDialog::OptionsDialog(QWidget *parent) :
     ui->proxyPort->setEnabled(false);
     ui->proxyPort->setValidator(new QIntValidator(1, 65535, this));
 
-    /** SOCKS version is only selectable for default proxy and is always 5 for IPv6 and Tor */
-    ui->socksVersion->setEnabled(false);
-    ui->socksVersion->addItem("5", 5);
-    ui->socksVersion->addItem("4", 4);
-    ui->socksVersion->setCurrentIndex(0);
-
     connect(ui->connectSocks, SIGNAL(toggled(bool)), ui->proxyIp, SLOT(setEnabled(bool)));
     connect(ui->connectSocks, SIGNAL(toggled(bool)), ui->proxyPort, SLOT(setEnabled(bool)));
-    connect(ui->connectSocks, SIGNAL(toggled(bool)), ui->socksVersion, SLOT(setEnabled(bool)));
 
     ui->proxyIp->installEventFilter(this);
 
@@ -182,7 +175,6 @@ void OptionsDialog::setMapper()
     mapper->addMapping(ui->connectSocks, OptionsModel::ProxyUse);
     mapper->addMapping(ui->proxyIp, OptionsModel::ProxyIP);
     mapper->addMapping(ui->proxyPort, OptionsModel::ProxyPort);
-    mapper->addMapping(ui->socksVersion, OptionsModel::ProxySocksVersion);
 
     /* Window */
 #ifndef Q_OS_MAC
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
index 09553a2587..f07e66bf04 100644
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -122,11 +122,6 @@ void OptionsModel::Init()
     // Only try to set -proxy, if user has enabled fUseProxy
     if (settings.value("fUseProxy").toBool() && !SoftSetArg("-proxy", settings.value("addrProxy").toString().toStdString()))
         addOverriddenOption("-proxy");
-    if (!settings.contains("nSocksVersion"))
-        settings.setValue("nSocksVersion", 5);
-    // Only try to set -socks, if user has enabled fUseProxy
-    if (settings.value("fUseProxy").toBool() && !SoftSetArg("-socks", settings.value("nSocksVersion").toString().toStdString()))
-        addOverriddenOption("-socks");
 
     // Display
     if (!settings.contains("language"))
@@ -188,8 +183,6 @@ QVariant OptionsModel::data(const QModelIndex & index, int role) const
             QStringList strlIpPort = settings.value("addrProxy").toString().split(":", QString::SkipEmptyParts);
             return strlIpPort.at(1);
         }
-        case ProxySocksVersion:
-            return settings.value("nSocksVersion", 5);
 
 #ifdef ENABLE_WALLET
         case Fee: {
@@ -284,13 +277,6 @@ bool OptionsModel::setData(const QModelIndex & index, const QVariant & value, in
             }
         }
         break;
-        case ProxySocksVersion: {
-            if (settings.value("nSocksVersion") != value) {
-                settings.setValue("nSocksVersion", value.toInt());
-                setRestartRequired(true);
-            }
-        }
-        break;
 #ifdef ENABLE_WALLET
         case Fee: { // core option - can be changed on-the-fly
             // Todo: Add is valid check  and warn via message, if not
@@ -378,20 +364,16 @@ bool OptionsModel::getProxySettings(QNetworkProxy& proxy) const
     // GUI settings can be overridden with -proxy.
     proxyType curProxy;
     if (GetProxy(NET_IPV4, curProxy)) {
-        if (curProxy.second == 5) {
-            proxy.setType(QNetworkProxy::Socks5Proxy);
-            proxy.setHostName(QString::fromStdString(curProxy.first.ToStringIP()));
-            proxy.setPort(curProxy.first.GetPort());
+        proxy.setType(QNetworkProxy::Socks5Proxy);
+        proxy.setHostName(QString::fromStdString(curProxy.ToStringIP()));
+        proxy.setPort(curProxy.GetPort());
 
-            return true;
-        }
-        else
-            return false;
+        return true;
     }
     else
         proxy.setType(QNetworkProxy::NoProxy);
 
-    return true;
+    return false;
 }
 
 void OptionsModel::setRestartRequired(bool fRequired)
diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp
index 53db2c5cd9..5471625a67 100644
--- a/src/qt/paymentserver.cpp
+++ b/src/qt/paymentserver.cpp
@@ -341,20 +341,14 @@ void PaymentServer::initNetManager()
 
     QNetworkProxy proxy;
 
-    // Query active proxy (fails if no SOCKS5 proxy)
+    // Query active SOCKS5 proxy
     if (optionsModel->getProxySettings(proxy)) {
-        if (proxy.type() == QNetworkProxy::Socks5Proxy) {
-            netManager->setProxy(proxy);
+        netManager->setProxy(proxy);
 
-            qDebug() << "PaymentServer::initNetManager : Using SOCKS5 proxy" << proxy.hostName() << ":" << proxy.port();
-        }
-        else
-            qDebug() << "PaymentServer::initNetManager : No active proxy server found.";
+        qDebug() << "PaymentServer::initNetManager : Using SOCKS5 proxy" << proxy.hostName() << ":" << proxy.port();
     }
     else
-        emit message(tr("Net manager warning"),
-            tr("Your active proxy doesn't support SOCKS5, which is required for payment requests via proxy."),
-            CClientUIInterface::MSG_WARNING);
+        qDebug() << "PaymentServer::initNetManager : No active proxy server found.";
 
     connect(netManager, SIGNAL(finished(QNetworkReply*)),
             this, SLOT(netRequestFinished(QNetworkReply*)));
diff --git a/src/rpcmisc.cpp b/src/rpcmisc.cpp
index 9ed6b52513..1e84393025 100644
--- a/src/rpcmisc.cpp
+++ b/src/rpcmisc.cpp
@@ -72,7 +72,7 @@ Value getinfo(const Array& params, bool fHelp)
     obj.push_back(Pair("blocks",        (int)chainActive.Height()));
     obj.push_back(Pair("timeoffset",    GetTimeOffset()));
     obj.push_back(Pair("connections",   (int)vNodes.size()));
-    obj.push_back(Pair("proxy",         (proxy.first.IsValid() ? proxy.first.ToStringIPPort() : string())));
+    obj.push_back(Pair("proxy",         (proxy.IsValid() ? proxy.ToStringIPPort() : string())));
     obj.push_back(Pair("difficulty",    (double)GetDifficulty()));
     obj.push_back(Pair("testnet",       Params().NetworkID() == CBaseChainParams::TESTNET));
 #ifdef ENABLE_WALLET
diff --git a/src/rpcnet.cpp b/src/rpcnet.cpp
index cd3bd59f8f..cf2c293caf 100644
--- a/src/rpcnet.cpp
+++ b/src/rpcnet.cpp
@@ -371,7 +371,7 @@ Value getnetworkinfo(const Array& params, bool fHelp)
     obj.push_back(Pair("localservices",       strprintf("%016x", nLocalServices)));
     obj.push_back(Pair("timeoffset",    GetTimeOffset()));
     obj.push_back(Pair("connections",   (int)vNodes.size()));
-    obj.push_back(Pair("proxy",         (proxy.first.IsValid() ? proxy.first.ToStringIPPort() : string())));
+    obj.push_back(Pair("proxy",         (proxy.IsValid() ? proxy.ToStringIPPort() : string())));
     obj.push_back(Pair("relayfee",      ValueFromAmount(::minRelayTxFee.GetFeePerK())));
     Array localAddresses;
     {