Borrow some ircd-seven code to create channel::use_local_channels.

doc/example.conf

@@ -339,6 +339,7 @@ channel {
 	use_except = yes;
 	use_knock = yes;
 	use_forward = yes;
+	use_local_channels = yes;
 	knock_delay = 5 minutes;
 	knock_delay_channel = 1 minute;
 	max_chans_per_user = 15;

doc/reference.conf

@@ -738,6 +738,12 @@ channel {
 	 */
 	use_knock = yes;
 
+	/* local channels: &Channel - a channel that exists only on one server
+	 * people on other servers will not be able to see or join local channels
+	 * from another server.
+	 */
+	use_local_channels = yes;
+
 	/* knock delay: The amount of time a user must wait between issuing
 	 * the knock command.
 	 */

include/s_conf.h

@@ -228,6 +228,7 @@ struct config_channel_entry
 	int use_invex;
 	int use_knock;
 	int use_forward;
+	int use_local_channels;
 	int knock_delay;
 	int knock_delay_channel;
 	int max_bans;

modules/m_info.c

@@ -608,6 +608,12 @@ static struct InfoStruct info_table[] = {
 		&ConfigChannel.use_knock,
 		"Enable /KNOCK",
 	},
+        {
+                "use_local_channels",
+                OUTPUT_BOOLEAN_YN,
+                &ConfigChannel.use_local_channels,
+                "Enable local channels (&channels)"
+        },
 	{
 		"resv_forcepart",
 		OUTPUT_BOOLEAN_YN,

src/channel.c

@@ -1668,7 +1668,8 @@ void user_join(struct Client * client_p, struct Client * source_p, const char *
 		}
 
 		/* check it begins with # or &, and local chans are disabled */
-		else if(!IsChannelName(name))
+                else if(!IsChannelName(name) ||
+                        ( !ConfigChannel.use_local_channels && name[0] == '&'))
 		{
 			sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL,
 					   form_str(ERR_NOSUCHCHANNEL), name);

src/newconf.c

@@ -2227,6 +2227,7 @@ static struct ConfEntry conf_channel_table[] =
 	{ "use_invex",		CF_YESNO, NULL, 0, &ConfigChannel.use_invex		},
 	{ "use_knock",		CF_YESNO, NULL, 0, &ConfigChannel.use_knock		},
 	{ "use_forward",	CF_YESNO, NULL, 0, &ConfigChannel.use_forward		},
+	{ "use_local_channels",	CF_YESNO, NULL, 0, &ConfigChannel.use_local_channels	},
 	{ "resv_forcepart",     CF_YESNO, NULL, 0, &ConfigChannel.resv_forcepart	},
 	{ "kick_no_rejoin_time", CF_INT,  NULL, 0, &ConfigChannel.kick_no_rejoin_time	},
 	{ "\0", 		0, 	  NULL, 0, NULL }

src/s_conf.c

@@ -753,6 +753,7 @@ set_default_conf(void)
 	ConfigChannel.use_invex = YES;
 	ConfigChannel.use_knock = YES;
 	ConfigChannel.use_forward = YES;
+	ConfigChannel.use_local_channels = YES;
 	ConfigChannel.knock_delay = 300;
 	ConfigChannel.knock_delay_channel = 60;
 	ConfigChannel.max_chans_per_user = 15;

src/supported.c

@@ -244,12 +244,20 @@ isupport_chanmodes(const void *ptr)
 	return result;
 }
 
+static const char *
+isupport_chantypes(const void *ptr)
+{
+       return ConfigChannel.use_local_channels ? "&#" : "#";
+}
+
 static const char *
 isupport_chanlimit(const void *ptr)
 {
 	static char result[30];
 
-	rb_snprintf(result, sizeof result, "&#:%i", ConfigChannel.max_chans_per_user);
+	rb_snprintf(result, sizeof result, "%s:%i",
+			ConfigChannel.use_local_channels ? "&#" : "#", 
+			ConfigChannel.max_chans_per_user);
 	return result;
 }
 
@@ -310,7 +318,7 @@ init_isupport(void)
 	static int channellen = LOC_CHANNELLEN;
 	static int topiclen = TOPICLEN;
 
-	add_isupport("CHANTYPES", isupport_string, "&#");
+	add_isupport("CHANTYPES", isupport_chantypes, NULL);
 	add_isupport("EXCEPTS", isupport_boolean, &ConfigChannel.use_except);
 	add_isupport("INVEX", isupport_boolean, &ConfigChannel.use_invex);
 	add_isupport("CHANMODES", isupport_chanmodes, NULL);