core: support IPv6 connections

classes.py

@@ -99,7 +99,8 @@ class Irc():
             port = self.serverdata["port"]
             checks_ok = True
             try:
-                self.socket = socket.socket()
+                stype = socket.AF_INET6 if self.serverdata.get("ipv6") else socket.AF_INET
+                self.socket = socket.socket(stype)
                 self.socket.setblocking(0)
                 # Initial connection timeout is a lot smaller than the timeout after
                 # we've connected; this is intentional.

config.yml.example

@@ -101,7 +101,11 @@ servers:
         # ssl_fingerprint: "e0fee1adf795c84eec4735f039503eb18d9c35cc"
 
     ts6net:
-        ip: 127.0.0.1
+        ip: ::1
+
+        # Determines whether IPv6 should be used for this connection.
+        ipv6: yes
+
         port: 7000
         recvpass: "abcd"
         sendpass: "abcd"