[QA] Allow addrman loopback tests (add debug option -addrmantest)

src/init.cpp

@@ -447,6 +447,7 @@ std::string HelpMessage(HelpMessageMode mode)
         strUsage += HelpMessageOpt("-limitdescendantcount=<n>", strprintf("Do not accept transactions if any ancestor would have <n> or more in-mempool descendants (default: %u)", DEFAULT_DESCENDANT_LIMIT));
         strUsage += HelpMessageOpt("-limitdescendantsize=<n>", strprintf("Do not accept transactions if any ancestor would have more than <n> kilobytes of in-mempool descendants (default: %u).", DEFAULT_DESCENDANT_SIZE_LIMIT));
         strUsage += HelpMessageOpt("-vbparams=deployment:start:end", "Use given start/end times for specified version bits deployment (regtest-only)");
+        strUsage += HelpMessageOpt("-addrmantest", "Allows to test address relay on localhost");
     }
     strUsage += HelpMessageOpt("-debug=<category>", strprintf(_("Output debugging information (default: %u, supplying <category> is optional)"), 0) + ". " +
         _("If <category> is not supplied or if <category> = 1, output all debugging information.") + " " + _("<category> can be:") + " " + ListLogCategories() + ".");

src/net.cpp

@@ -181,6 +181,10 @@ void AdvertiseLocal(CNode *pnode)
     if (fListen && pnode->fSuccessfullyConnected)
     {
         CAddress addrLocal = GetLocalAddress(&pnode->addr, pnode->GetLocalServices());
+        if (gArgs.GetBoolArg("-addrmantest", false)) {
+            // use IPv4 loopback during addrmantest
+            addrLocal = CAddress(CService(LookupNumeric("127.0.0.1", GetListenPort())), pnode->GetLocalServices());
+        }
         // If discovery is enabled, sometimes give our peer the address it
         // tells us that it sees us as in case it has a better idea of our
         // address than we do.
@@ -189,7 +193,7 @@ void AdvertiseLocal(CNode *pnode)
         {
             addrLocal.SetIP(pnode->GetAddrLocal());
         }
-        if (addrLocal.IsRoutable())
+        if (addrLocal.IsRoutable() || gArgs.GetBoolArg("-addrmantest", false))
         {
             LogPrint(BCLog::NET, "AdvertiseLocal: advertising address %s\n", addrLocal.ToString());
             FastRandomContext insecure_rand;