From 722c63ad53dea99829cf010786354e21016aadef Mon Sep 17 00:00:00 2001
From: Sadie Powell <sadie@witchery.services>
Date: Fri, 4 Jun 2021 01:58:33 +0100
Subject: Broadcast the limits for list modes on server link.

This allows services to not overflow the limit.
---
 src/modules/m_spanningtree/main.cpp     |  1 +
 src/modules/m_spanningtree/netburst.cpp |  1 +
 src/modules/m_spanningtree/utils.cpp    | 22 ++++++++++++++++++++++
 src/modules/m_spanningtree/utils.h      |  3 +++
 4 files changed, 27 insertions(+)

(limited to 'src/modules')

diff --git a/src/modules/m_spanningtree/main.cpp b/src/modules/m_spanningtree/main.cpp
index 507897a4e..a2a9173eb 100644
--- a/src/modules/m_spanningtree/main.cpp
+++ b/src/modules/m_spanningtree/main.cpp
@@ -511,6 +511,7 @@ void ModuleSpanningTree::OnUserJoin(Membership* memb, bool sync, bool created_by
 		params.add(memb);
 		params.finalize();
 		params.Broadcast();
+		Utils->SendListLimits(memb->chan, NULL);
 	}
 	else
 	{
diff --git a/src/modules/m_spanningtree/netburst.cpp b/src/modules/m_spanningtree/netburst.cpp
index ac68efb96..d8ea30060 100644
--- a/src/modules/m_spanningtree/netburst.cpp
+++ b/src/modules/m_spanningtree/netburst.cpp
@@ -258,6 +258,7 @@ void TreeSocket::SyncChannel(Channel* chan, BurstState& bs)
 	if (chan->topicset != 0)
 		this->WriteLine(CommandFTopic::Builder(chan));
 
+	Utils->SendListLimits(chan, this);
 	SendListModes(chan);
 
 	for (Extensible::ExtensibleStore::const_iterator i = chan->GetExtList().begin(); i != chan->GetExtList().end(); i++)
diff --git a/src/modules/m_spanningtree/utils.cpp b/src/modules/m_spanningtree/utils.cpp
index 809963625..84d96e098 100644
--- a/src/modules/m_spanningtree/utils.cpp
+++ b/src/modules/m_spanningtree/utils.cpp
@@ -25,6 +25,7 @@
 
 
 #include "inspircd.h"
+#include "listmode.h"
 
 #include "main.h"
 #include "utils.h"
@@ -374,3 +375,24 @@ void SpanningTreeUtilities::SendChannelMessage(User* source, Channel* target, co
 			Sock->WriteLine(msg);
 	}
 }
+
+void SpanningTreeUtilities::SendListLimits(Channel* chan, TreeSocket* sock)
+{
+	std::stringstream buffer;
+	const ModeParser::ListModeList& listmodes = ServerInstance->Modes->GetListModes();
+	for (ModeParser::ListModeList::const_iterator i = listmodes.begin(); i != listmodes.end(); ++i)
+	{
+		ListModeBase* lm = *i;
+		buffer << lm->GetModeChar() << " " << lm->GetLimit(chan) << " ";
+	}
+
+	std::string bufferstr = buffer.str();
+	if (bufferstr.empty())
+		return; // Should never happen.
+
+	bufferstr.erase(bufferstr.end() - 1);
+	if (sock)
+		sock->WriteLine(CommandMetadata::Builder(chan, "maxlist", bufferstr));
+	else
+		CommandMetadata::Builder(chan, "maxlist", bufferstr).Broadcast();
+}
diff --git a/src/modules/m_spanningtree/utils.h b/src/modules/m_spanningtree/utils.h
index 26e6e7c22..262c285ef 100644
--- a/src/modules/m_spanningtree/utils.h
+++ b/src/modules/m_spanningtree/utils.h
@@ -176,6 +176,9 @@ class SpanningTreeUtilities : public classbase
 	/** Sends a PRIVMSG or a NOTICE to a channel obeying an exempt list and an optional prefix
 	 */
 	void SendChannelMessage(User* source, Channel* target, const std::string& text, char status, const ClientProtocol::TagMap& tags, const CUList& exempt_list, const char* message_type, TreeSocket* omit = NULL);
+
+	/** Send the channel list mode limits to either the specified server or all servers if NULL. */
+	void SendListLimits(Channel* chan, TreeSocket* sock = NULL);
 };
 
 inline void SpanningTreeUtilities::DoOneToMany(const CmdBuilder& params)
-- 
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