init: allow UNIX socket path for -proxy and -onion

src/init.cpp

@@ -1298,8 +1298,15 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
             std::string host_out;
             uint16_t port_out{0};
             if (!SplitHostPort(socket_addr, port_out, host_out)) {
+#if HAVE_SOCKADDR_UN
+                // Allow unix domain sockets for -proxy and -onion e.g. unix:/some/file/path
+                if ((port_option != "-proxy" && port_option != "-onion") || socket_addr.find(ADDR_PREFIX_UNIX) != 0) {
                     return InitError(InvalidPortErrMsg(port_option, socket_addr));
                 }
+#else
+                return InitError(InvalidPortErrMsg(port_option, socket_addr));
+#endif
+            }
         }
     }
 
@@ -1365,12 +1372,18 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
     // -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 = args.GetArg("-proxy", "");
     if (proxyArg != "" && proxyArg != "0") {
+        Proxy addrProxy;
+        if (IsUnixSocketPath(proxyArg)) {
+            addrProxy = Proxy(proxyArg, proxyRandomize);
+        } else {
             const std::optional<CService> proxyAddr{Lookup(proxyArg, 9050, fNameLookup)};
             if (!proxyAddr.has_value()) {
                 return InitError(strprintf(_("Invalid -proxy address or hostname: '%s'"), proxyArg));
             }
 
-        Proxy addrProxy = Proxy(proxyAddr.value(), proxyRandomize);
+            addrProxy = Proxy(proxyAddr.value(), proxyRandomize);
+        }
+
         if (!addrProxy.IsValid())
             return InitError(strprintf(_("Invalid -proxy address or hostname: '%s'"), proxyArg));
 
@@ -1395,12 +1408,17 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
                     _("Outbound connections restricted to Tor (-onlynet=onion) but the proxy for "
                       "reaching the Tor network is explicitly forbidden: -onion=0"));
             }
+        } else {
+            if (IsUnixSocketPath(onionArg)) {
+                onion_proxy = Proxy(onionArg, proxyRandomize);
             } else {
                 const std::optional<CService> addr{Lookup(onionArg, 9050, fNameLookup)};
                 if (!addr.has_value() || !addr->IsValid()) {
                     return InitError(strprintf(_("Invalid -onion address or hostname: '%s'"), onionArg));
                 }
-            onion_proxy = Proxy{addr.value(), proxyRandomize};
+
+                onion_proxy = Proxy(addr.value(), proxyRandomize);
+            }
         }
     }