From bb10433ec518f95151abda1cf179de69b12c61e4 Mon Sep 17 00:00:00 2001
From: Mike Quin <mike@elite.uk.com>
Date: Sat, 12 Jun 2021 19:22:42 +0100
Subject: [PATCH] Port m_invex_regonly from ircd-seven (#178)

Port m_invex_regonly from ircd-seven

This module allows +I to be used to bypass +r (registered only) as
well as +i (invite only).

Co-authored-by: Doug Freed <dwfreed@mtu.edu>
Co-authored-by: Ed Kellett <e@kellett.im>
---
 extensions/Makefile.am     |  1 +
 extensions/invex_regonly.c | 46 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 extensions/invex_regonly.c

diff --git a/extensions/Makefile.am b/extensions/Makefile.am
index 1d3bcda8..850650fa 100644
--- a/extensions/Makefile.am
+++ b/extensions/Makefile.am
@@ -68,6 +68,7 @@ extension_LTLIBRARIES =		\
   drain.la			\
   identify_msg.la		\
   cap_realhost.la		\
+  invex_regonly.la		\
   example_module.la
 
 if HAVE_HYPERSCAN
diff --git a/extensions/invex_regonly.c b/extensions/invex_regonly.c
new file mode 100644
index 00000000..2cce04ab
--- /dev/null
+++ b/extensions/invex_regonly.c
@@ -0,0 +1,46 @@
+/*
+ * invex_regonly.c Allow invite exemptions to bypass registered-only (+r)
+ */
+#include "stdinc.h"
+#include "modules.h"
+#include "hook.h"
+#include "channel.h"
+#include "s_conf.h"
+#include "numeric.h"
+
+static void h_can_join(hook_data_channel *);
+
+mapi_hfn_list_av1 invex_regonly_hfnlist[] = {
+	{ "can_join", (hookfn) h_can_join },
+	{ NULL, NULL }
+};
+
+DECLARE_MODULE_AV1(invex_regonly, NULL, NULL, NULL, NULL, invex_regonly_hfnlist, "$Revision$");
+
+static void
+h_can_join(hook_data_channel *data)
+{
+	struct Client *source_p = data->client;
+	struct Channel *chptr = data->chptr;
+	struct Ban *invex = NULL;
+	struct matchset ms;
+	rb_dlink_node *ptr;
+	
+	if(data->approved != ERR_NEEDREGGEDNICK)
+		return;
+	if(!ConfigChannel.use_invex)
+		return;
+
+	matchset_for_client(source_p, &ms);
+
+	RB_DLINK_FOREACH(ptr, chptr->invexlist.head)
+	{
+		invex = ptr->data;
+		if (matches_mask(&ms, invex->banstr) ||
+				match_extban(invex->banstr, source_p, chptr, CHFL_INVEX))
+		{
+			data->approved = 0;
+			break;
+		}
+	}
+}