m_spanningtree Accept legacy JOINs from 1202-protocol servers

2.0 accepted JOIN and some pseudoservers might use it

1 files changed, 14 insertions, 0 deletions

diff --git a/src/modules/m_spanningtree/compat.cpp b/src/modules/m_spanningtree/compat.cpp
index b9c7e6940..724a5ced9 100644
--- a/src/modules/m_spanningtree/compat.cpp
+++ b/src/modules/m_spanningtree/compat.cpp
@@ -401,6 +401,20 @@ bool TreeSocket::PreProcessOldProtocolMessage(User*& who, std::string& cmd, std:
 		cmd = "SINFO";
 		params.insert(params.begin(), "version");
 	}
+	else if (cmd == "JOIN")
+	{
+		// 2.0 allows and forwards legacy JOINs but we don't, so translate them to FJOINs before processing
+		if ((params.size() != 1) || (IS_SERVER(who)))
+			return false; // Huh?
+
+		cmd = "FJOIN";
+		Channel* chan = ServerInstance->FindChan(params[0]);
+		params.push_back(ConvToStr(chan ? chan->age : ServerInstance->Time()));
+		params.push_back("+");
+		params.push_back(",");
+		params.back().append(who->uuid);
+		who = TreeServer::Get(who)->ServerUser;
+	}
 
 	return true; // Passthru
 }