Enable host lookups for -proxy and -onion parameters

* Extends -dns parameter (via fNameLookup) to control these two new
  parameters in addition to -addnode, -connect, and -seednode

* Moves fNameLookup assignment earlier as needed

* Changes -proxy and -onion to use Lookup() instead of LookupNumeric()

src/init.cpp

@@ -1248,16 +1248,23 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
         }
     }
 
+    // Check for host lookup allowed before parsing any network related parameters
+    fNameLookup = GetBoolArg("-dns", DEFAULT_NAME_LOOKUP);
+
     bool proxyRandomize = GetBoolArg("-proxyrandomize", DEFAULT_PROXYRANDOMIZE);
     // -proxy sets a proxy for all outgoing network traffic
     // -noproxy (or -proxy=0) as well as the empty string can be used to not set a proxy, this is the default
     std::string proxyArg = GetArg("-proxy", "");
     SetLimited(NET_TOR);
     if (proxyArg != "" && proxyArg != "0") {
-        CService resolved(LookupNumeric(proxyArg.c_str(), 9050));
-        proxyType addrProxy = proxyType(resolved, proxyRandomize);
+        CService proxyAddr;
+        if (!Lookup(proxyArg.c_str(), proxyAddr, 9050, fNameLookup)) {
+            return InitError(strprintf(_("Invalid -proxy address or hostname: '%s'"), proxyArg));
+        }
+
+        proxyType addrProxy = proxyType(proxyAddr, proxyRandomize);
         if (!addrProxy.IsValid())
-            return InitError(strprintf(_("Invalid -proxy address: '%s'"), proxyArg));
+            return InitError(strprintf(_("Invalid -proxy address or hostname: '%s'"), proxyArg));
 
         SetProxy(NET_IPV4, addrProxy);
         SetProxy(NET_IPV6, addrProxy);
@@ -1274,10 +1281,13 @@ bool AppInitMain(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(), 9050));
-            proxyType addrOnion = proxyType(resolved, proxyRandomize);
+            CService onionProxy;
+            if (!Lookup(onionArg.c_str(), onionProxy, 9050, fNameLookup)) {
+                return InitError(strprintf(_("Invalid -onion address or hostname: '%s'"), onionArg));
+            }
+            proxyType addrOnion = proxyType(onionProxy, proxyRandomize);
             if (!addrOnion.IsValid())
-                return InitError(strprintf(_("Invalid -onion address: '%s'"), onionArg));
+                return InitError(strprintf(_("Invalid -onion address or hostname: '%s'"), onionArg));
             SetProxy(NET_TOR, addrOnion);
             SetLimited(NET_TOR, false);
         }
@@ -1286,7 +1296,6 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
     // see Step 2: parameter interactions for more information about these
     fListen = GetBoolArg("-listen", DEFAULT_LISTEN);
     fDiscover = GetBoolArg("-discover", true);
-    fNameLookup = GetBoolArg("-dns", DEFAULT_NAME_LOOKUP);
     fRelayTxes = !GetBoolArg("-blocksonly", DEFAULT_BLOCKSONLY);
 
     if (fListen) {