Irc: resolve hostnames when connecting

Cloeses #158.

classes.py

@@ -184,6 +184,11 @@ class Irc():
                 # intentional.
                 self.socket.settimeout(self.pingfreq)
 
+                # Resolve hostnames if it's not an IP address already.
+                old_ip = ip
+                ip = socket.getaddrinfo(ip, port, stype)[0][-1][0]
+                log.debug('(%s) Resolving address %s to %s', self.name, old_ip, ip)
+
                 # Enable SSL if set to do so. This requires a valid keyfile and
                 # certfile to be present.
                 self.ssl = self.serverdata.get('ssl')

example-conf.yml

@@ -44,7 +44,8 @@ servers:
     # You should change this to some abbreviation representing your network
     # name; usually something 3-5 characters should be good.
     inspnet:
-        # Server IP, port, and passwords
+        # Server IP, port, and passwords. The ip: field also supports resolving
+        # hostnames, but this is not well tested and thus not recommended.
         ip: 127.0.0.1
         port: 7000
         recvpass: "abcd"
@@ -121,7 +122,9 @@ servers:
     ts6net:
         ip: ::1
 
-        # Determines whether IPv6 should be used for this connection.
+        # Determines whether IPv6 should be used for this connection. Should the ip:
+        # above be a hostname instead of an IP, this will affect whether A records
+        # (IPv4) or AAAA records (IPv6) will be used in resolving it.
         ipv6: yes
 
         port: 7000