A very draft version of extensions, which are adding can_join hooks for custom channel modes

extensions/chm_operonly.c

@@ -0,0 +1,67 @@
+#include "stdinc.h"
+#include "modules.h"
+#include "hook.h"
+#include "client.h"
+#include "ircd.h"
+#include "send.h"
+#include "s_conf.h"
+#include "s_user.h"
+#include "s_serv.h"
+#include "numeric.h"
+#include "chmode.h"
+
+/* gcc -fPIC -DPIC -shared  -I. -I../include -I../libratbox/include   -O0 -Wall -std=gnu99 -g  -DIRCD_PREFIX=\"/home/dwr/build/charybdis\" chm_operonly.c -o chm_operonly.so */
+
+static void h_can_join(hook_data_channel *);
+
+mapi_hfn_list_av1 operonly_hfnlist[] = {
+	{ "can_join", (hookfn) h_can_join },
+	{ NULL, NULL }
+};
+
+
+
+/* This is a simple example of how to use dynamic channel modes.
+ * Not tested enough yet, use at own risk.
+ * -- dwr
+ */
+static int
+_modinit(void)
+{
+	/* add the channel mode to the available slot */
+	chmode_table['O'].mode_type = find_cflag_slot();
+	chmode_table['O'].set_func = chm_simple;
+
+	construct_noparam_modes();
+
+	return 0;
+}
+
+
+/* Well, the first ugly thing is that we changle chmode_table in _modinit
+ * and chmode_flags in _moddeinit (different arrays) - must be fixed.
+ * -- dwr
+ */
+static void
+_moddeinit(void)
+{
+	/* disable the channel mode and remove it from the available list */
+	chmode_table['O'].mode_type = 0;
+
+	construct_noparam_modes();
+}
+
+DECLARE_MODULE_AV1(chm_operonly, _modinit, _moddeinit, NULL, NULL, operonly_hfnlist, "$Revision$");
+
+static void
+h_can_join(hook_data_channel *data)
+{
+	struct Client *source_p = data->client;
+	struct Channel *chptr = data->chptr;
+
+	if((chptr->mode.mode & chmode_flags['O']) && !IsOper(source_p)) {
+		sendto_one_notice(source_p, ":Only IRC Operators could join this channel!");
+		data->approved = ERR_CUSTOM;
+	}
+}
+

include/chmode.h

@@ -28,6 +28,12 @@
 #ifndef INCLUDED_chmode_h
 #define INCLUDED_chmode_h
 
+/* something not included in messages.tab
+ * to change some hooks behaviour when needed
+ * -- dwr
+ */
+#define ERR_CUSTOM 1000
+
 extern void chm_nosuch(struct Client *source_p, struct Channel *chptr,
 	   int alevel, int parc, int *parn,
 	   const char **parv, int *errors, int dir, char c, long mode_type);

modules/core/m_join.c

@@ -40,6 +40,7 @@
 #include "parse.h"
 #include "modules.h"
 #include "packet.h"
+#include "chmode.h"
 
 static int m_join(struct Client *, struct Client *, int, const char **);
 static int ms_join(struct Client *, struct Client *, int, const char **);
@@ -302,11 +303,18 @@ m_join(struct Client *client_p, struct Client *source_p, int parc, const char *p
 			if ((i != ERR_NEEDREGGEDNICK && i != ERR_THROTTLE && i != ERR_INVITEONLYCHAN && i != ERR_CHANNELISFULL) ||
 			    (!ConfigChannel.use_forward || (chptr = check_forward(source_p, chptr, key)) == NULL))
 			{
+				/* might be wrong, but is there any other better location for such?
+				 * see extensions/chm_operonly.c for other comments on this
+				 * -- dwr
+				 */
+				if(i != ERR_CUSTOM)
 					sendto_one(source_p, form_str(i), me.name, source_p->name, name);
+
 				if(successful_join_count > 0)
 					successful_join_count--;
 				continue;
 			}
+
 			sendto_one_numeric(source_p, ERR_LINKCHANNEL, form_str(ERR_LINKCHANNEL), name, chptr->chname);
 		}
 

src/chmode.c

@@ -69,6 +69,7 @@ char cflagsbuf[256];
 char cflagsmyinfo[256];
 
 int chmode_flags[256];
+
 /* OPTIMIZE ME! -- dwr */
 void
 construct_noparam_modes(void)