From fd8a9aafe78ea4eb2aeae9376336085e5214753e Mon Sep 17 00:00:00 2001
From: Les De Ridder <les@lesderid.net>
Date: Wed, 24 May 2017 00:06:11 +0200
Subject: [PATCH] Check if the user is allowed to send to a channel

---
 source/ircd/channel.d    | 18 ++++++++++++++++++
 source/ircd/connection.d |  7 ++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/source/ircd/channel.d b/source/ircd/channel.d
index 929cabc..a569ca5 100644
--- a/source/ircd/channel.d
+++ b/source/ircd/channel.d
@@ -324,4 +324,22 @@ class Channel
 	{
 		return members.canFind(connection) || !modes.canFind('s') && !modes.canFind('p');
 	}
+
+	bool canReceiveMessagesFromUser(Connection connection)
+	{
+		if(modes.canFind('n') && !members.canFind(connection))
+		{
+			return false;
+		}
+		else if(modes.canFind('m') && nickPrefix(connection).empty)
+		{
+			return false;
+		}
+		else if(maskLists['b'].any!(m => connection.matchesMask(m)) && !maskLists['e'].any!(m => connection.matchesMask(m)))
+		{
+			return false;
+		}
+
+		return true;
+	}
 }
diff --git a/source/ircd/connection.d b/source/ircd/connection.d
index 9b6cfc1..993de93 100644
--- a/source/ircd/connection.d
+++ b/source/ircd/connection.d
@@ -397,10 +397,15 @@ class Connection
 
 		if(Server.isValidChannelName(target))
 		{
-			if(!_server.canFindChannelByName(target))
+			auto channelRange = _server.findChannelByName(target);
+			if(channelRange.empty)
 			{
 				sendErrNoSuchNick(target);
 			}
+			else if(!channelRange[0].canReceiveMessagesFromUser(this))
+			{
+				send(Message(_server.name, "404", [nick, target, "Cannot send to channel"], true));
+			}
 			else
 			{
 				_server.privmsgToChannel(this, target, text);