changehost: add enable and enforce as network specific options.

Closes #611.

example-conf.yml

@@ -685,13 +685,17 @@ changehost:
     # Sets the networks where Changehost should be enabled. Please note: changehost does NOT support
     # arbitrarily cloaking clients introduced by PyLink (e.g. relay clients), as doing so would make
     # ban matching impossible. In these cases, it is the remote admin's job to turn on cloaking on
-    # their IRCd!
+    # their IRCd.
+    # You can also add to this list of enabled networks by setting "servers::<server name>::changehost_enable"
+    # to true.
     enabled_nets:
         - inspnet
         - ts6net
 
     # Sets the networks where Changehost hosts should be enforced: that is, any attempts
     # by the user or other services to overwrite a host will be reverted.
+    # You can also add to this list of enabled networks by setting "servers::<server name>::changehost_enforce"
+    # to true.
     #enforced_nets:
     #    - inspnet
 
@@ -709,9 +713,8 @@ changehost:
     #match_ip: false
     #match_realhosts: false
 
-    # This sets the hostmasks that Changehost should look for. Whenever someone
-    # with a matching nick!user@host connects, their host will be set to the
-    # text defined. The following substitutions are available here:
+    # This sets the hostmasks that Changehost should look for. Whenever someone with a matching nick!user@host
+    # connects, their host will be set to the text defined. The following substitutions are available here:
     # $uid, $ts (time of connection), $nick, $realhost, $ident, and $ip.
     # Invalid characters in hosts are replaced with a "-".
     # Also, make sure you quote each entry so the YAML parser treats them as raw strings.

plugins/changehost.py

@@ -19,11 +19,7 @@ def _changehost(irc, target):
         log.debug('(%s) Skipping changehost on internal client %s', irc.name, target)
         return
 
-    if not changehost_conf:
-        log.warning("(%s) Missing 'changehost:' configuration block; "
-                    "Changehost will not function correctly!", irc.name)
-        return
-    elif irc.name not in changehost_conf.get('enabled_nets'):
+    if irc.name not in changehost_conf.get('enabled_nets') and not irc.serverdata.get('changehost_enable'):
         # We're not enabled on the network, break.
         return
 
@@ -89,14 +85,12 @@ def handle_chghost(irc, sender, command, args):
     """
     Handles incoming CHGHOST requests for optional host-change enforcement.
     """
-    changehost_conf = conf.conf.get("changehost")
-    if not changehost_conf:
-        return
+    changehost_conf = conf.conf.get("changehost", {})
 
     target = args['target']
 
     if (not irc.is_internal_client(sender)) and (not irc.is_internal_server(sender)):
-        if irc.name in changehost_conf.get('enforced_nets', []):
+        if irc.name in changehost_conf.get('enforced_nets', []) or irc.serverdata.get('changehost_enforce'):
             log.debug('(%s) Enforce for network is on, re-checking host for target %s/%s',
                       irc.name, target, irc.get_friendly_name(target))