net: Have LookupNumeric return a CService directly

Also fix up a few small issues:
- Lookup with "badip:port" now sets the port to 0
- Don't allow assert to have side-effects

src/httpserver.cpp

@@ -619,7 +619,7 @@ CService HTTPRequest::GetPeer()
         const char* address = "";
         uint16_t port = 0;
         evhttp_connection_get_peer(con, (char**)&address, &port);
-        LookupNumeric(address, peer, port);
+        peer = LookupNumeric(address, port);
     }
     return peer;
 }

src/init.cpp

@@ -1098,8 +1098,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
     std::string proxyArg = GetArg("-proxy", "");
     SetLimited(NET_TOR);
     if (proxyArg != "" && proxyArg != "0") {
-        CService resolved;
-        LookupNumeric(proxyArg.c_str(), resolved, 9050);
+        CService resolved(LookupNumeric(proxyArg.c_str(), 9050));
         proxyType addrProxy = proxyType(resolved, proxyRandomize);
         if (!addrProxy.IsValid())
             return InitError(strprintf(_("Invalid -proxy address: '%s'"), proxyArg));
@@ -1119,8 +1118,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
         if (onionArg == "0") { // Handle -noonion/-onion=0
             SetLimited(NET_TOR); // set onions as unreachable
         } else {
-            CService resolved;
-            LookupNumeric(onionArg.c_str(), resolved, 9050);
+            CService resolved(LookupNumeric(onionArg.c_str(), 9050));
             proxyType addrOnion = proxyType(resolved, proxyRandomize);
             if (!addrOnion.IsValid())
                 return InitError(strprintf(_("Invalid -onion address: '%s'"), onionArg));

src/net.cpp

@@ -1728,8 +1728,7 @@ std::vector<AddedNodeInfo> GetAddedNodeInfo()
     }
 
     BOOST_FOREACH(const std::string& strAddNode, lAddresses) {
-        CService service;
-        LookupNumeric(strAddNode.c_str(), service, Params().GetDefaultPort());
+        CService service(LookupNumeric(strAddNode.c_str(), Params().GetDefaultPort()));
         if (service.IsValid()) {
             // strAddNode is an IP:port
             auto it = mapConnected.find(service);
@@ -1767,8 +1766,7 @@ void ThreadOpenAddedConnections()
                 CSemaphoreGrant grant(*semOutbound);
                 // If strAddedNode is an IP/port, decode it immediately, so
                 // OpenNetworkConnection can detect existing connections to that IP/port.
-                CService service;
-                LookupNumeric(info.strAddedNode.c_str(), service, Params().GetDefaultPort());
+                CService service(LookupNumeric(info.strAddedNode.c_str(), Params().GetDefaultPort()));
                 OpenNetworkConnection(CAddress(service, NODE_NONE), false, &grant, info.strAddedNode.c_str(), false);
                 MilliSleep(500);
             }

src/netbase.cpp

@@ -231,9 +231,14 @@ bool Lookup(const char *pszName, CService& addr, int portDefault, bool fAllowLoo
     return true;
 }
 
-bool LookupNumeric(const char *pszName, CService& addr, int portDefault)
+CService LookupNumeric(const char *pszName, int portDefault)
 {
-    return Lookup(pszName, addr, portDefault, false);
+    CService addr;
+    // "1.2:345" will fail to resolve the ip, but will still set the port.
+    // If the ip fails to resolve, re-init the result.
+    if(!Lookup(pszName, addr, portDefault, false))
+        addr = CService();
+    return addr;
 }
 
 struct timeval MillisToTimeval(int64_t nTimeout)

src/netbase.h

@@ -49,7 +49,7 @@ bool LookupHost(const char *pszName, std::vector<CNetAddr>& vIP, unsigned int nM
 bool LookupHost(const char *pszName, CNetAddr& addr, bool fAllowLookup);
 bool Lookup(const char *pszName, CService& addr, int portDefault, bool fAllowLookup);
 bool Lookup(const char *pszName, std::vector<CService>& vAddr, int portDefault, bool fAllowLookup, unsigned int nMaxSolutions);
-bool LookupNumeric(const char *pszName, CService& addr, int portDefault = 0);
+CService LookupNumeric(const char *pszName, int portDefault = 0);
 bool LookupSubNet(const char *pszName, CSubNet& subnet);
 bool ConnectSocket(const CService &addr, SOCKET& hSocketRet, int nTimeout, bool *outProxyConnectionFailed = 0);
 bool ConnectSocketByName(CService &addr, SOCKET& hSocketRet, const char *pszDest, int portDefault, int nTimeout, bool *outProxyConnectionFailed = 0);

src/qt/optionsdialog.cpp

@@ -327,8 +327,7 @@ QValidator::State ProxyAddressValidator::validate(QString &input, int &pos) cons
 {
     Q_UNUSED(pos);
     // Validate the proxy
-    CService serv;
-    LookupNumeric(input.toStdString().c_str(), serv, 9050);
+    CService serv(LookupNumeric(input.toStdString().c_str(), 9050));
     proxyType addrProxy = proxyType(serv, true);
     if (addrProxy.IsValid())
         return QValidator::Acceptable;

src/test/netbase_tests.cpp

@@ -93,9 +93,7 @@ BOOST_AUTO_TEST_CASE(netbase_splithost)
 
 bool static TestParse(string src, string canon)
 {
-    CService addr;
-    if (!LookupNumeric(src.c_str(), addr, 65535))
-        return canon == "";
+    CService addr(LookupNumeric(src.c_str(), 65535));
     return canon == addr.ToString();
 }
 
@@ -107,7 +105,7 @@ BOOST_AUTO_TEST_CASE(netbase_lookupnumeric)
     BOOST_CHECK(TestParse("::", "[::]:65535"));
     BOOST_CHECK(TestParse("[::]:8333", "[::]:8333"));
     BOOST_CHECK(TestParse("[127.0.0.1]", "127.0.0.1:65535"));
-    BOOST_CHECK(TestParse(":::", ""));
+    BOOST_CHECK(TestParse(":::", "[::]:0"));
 }
 
 BOOST_AUTO_TEST_CASE(onioncat_test)

src/torcontrol.cpp

@@ -438,7 +438,7 @@ void TorController::add_onion_cb(TorControlConnection& conn, const TorControlRep
             if ((i = m.find("PrivateKey")) != m.end())
                 private_key = i->second;
         }
-        LookupNumeric(std::string(service_id+".onion").c_str(), service, GetListenPort());
+        service = LookupNumeric(std::string(service_id+".onion").c_str(), GetListenPort());
         LogPrintf("tor: Got service ID %s, advertising service %s\n", service_id, service.ToString());
         if (WriteBinaryFile(GetPrivateKeyFile(), private_key)) {
             LogPrint("tor", "tor: Cached service private key to %s\n", GetPrivateKeyFile());
@@ -462,8 +462,7 @@ void TorController::auth_cb(TorControlConnection& conn, const TorControlReply& r
         // Now that we know Tor is running setup the proxy for onion addresses
         // if -onion isn't set to something else.
         if (GetArg("-onion", "") == "") {
-            CService resolved;
-            assert(LookupNumeric("127.0.0.1", resolved, 9050));
+            CService resolved(LookupNumeric("127.0.0.1", 9050));
             proxyType addrOnion = proxyType(resolved, true);
             SetProxy(NET_TOR, addrOnion);
             SetLimited(NET_TOR, false);