Shuffle the modules about a bit.

1 files changed, 142 insertions, 0 deletions

diff --git a/modules/spanningtree/compat.cpp b/modules/spanningtree/compat.cpp
new file mode 100644
index 000000000..197b0e73c
--- /dev/null
+++ b/modules/spanningtree/compat.cpp
@@ -0,0 +1,142 @@
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ *   Copyright (C) 2021, 2024 Sadie Powell <sadie@witchery.services>
+ *
+ * This file is part of InspIRCd.  InspIRCd is free software: you can
+ * redistribute it and/or modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "inspircd.h"
+#include "main.h"
+
+namespace
+{
+	size_t NextToken(const std::string& line, size_t start)
+	{
+		if (start == std::string::npos || start + 1 > line.length())
+			return std::string::npos;
+
+		return line.find(' ', start + 1);
+	}
+}
+
+void TreeSocket::WriteLine(const std::string& original_line)
+{
+	if (LinkState != CONNECTED || proto_version == PROTO_NEWEST)
+	{
+		// Don't translate connections which have negotiated PROTO_NEWEST or
+		// where the protocol hasn't been negotiated yet.
+		WriteLineInternal(original_line);
+		return;
+	}
+
+	std::string line = original_line;
+	size_t cmdstart = 0;
+
+	if (line[0] == '@') // Skip the tags.
+	{
+		cmdstart = NextToken(line, 0);
+		if (cmdstart != std::string::npos)
+			cmdstart++;
+	}
+
+	if (line[cmdstart] == ':') // Skip the prefix.
+	{
+		cmdstart = NextToken(line, cmdstart);
+		if (cmdstart != std::string::npos)
+			cmdstart++;
+	}
+
+	// Find the end of the command.
+	size_t cmdend = NextToken(line, cmdstart);
+	if (cmdend == std::string::npos)
+		cmdend = line.size() - 1;
+
+	std::string command(line, cmdstart, cmdend - cmdstart);
+	if (proto_version == PROTO_INSPIRCD_3)
+	{
+		if (irc::equals(command, "FHOST") || irc::equals(command, "FIDENT"))
+		{
+			// FIDENT/FHOST has two parameters in v4; drop the real username/hostname.
+			// :<sid> FIDENT|FHOST <display|*> <real|*>
+			size_t displayend = NextToken(line, cmdend);
+			if (displayend != std::string::npos)
+			{
+				if ((displayend - cmdend) == 2 && line[displayend - 1] == '*')
+					return; // FIDENT/FHOST is only changing the real username/hostname; drop.
+
+				// Trim the rest of the line.
+				line.erase(displayend);
+			}
+		}
+		else if (irc::equals(command, "METADATA"))
+		{
+			// :<sid> METADATA <uuid|chan|*|@> <name> :<value>
+			size_t targetend = NextToken(line, cmdend);
+			size_t nameend = NextToken(line, targetend);
+			size_t flagend = NextToken(line, nameend);
+			if (flagend != std::string::npos)
+			{
+				std::string extname(line, targetend + 1, nameend - targetend - 1);
+				if (irc::equals(extname, "ssl_cert"))
+				{
+					// Check we have the "e" flag (no error).
+					if (line.find('e', nameend + 1) < flagend)
+					{
+						size_t fpend = NextToken(line, flagend);
+						if (fpend != std::string::npos)
+						{
+							size_t commapos = line.find(',', flagend + 1);
+							if (commapos < fpend)
+							{
+								// Multiple fingerprints in ssl_cert was introduced in PROTO_INSPIRCD_4; drop it.
+								line.erase(commapos, fpend - commapos);
+							}
+
+						}
+					}
+				}
+			}
+		}
+		else if (irc::equals(command, "SQUERY"))
+		{
+			// SQUERY was introduced in PROTO_INSPIRCD_4; convert to PRIVMSG.
+			line.replace(cmdstart, 6, "PRIVMSG");
+		}
+	}
+
+	WriteLineInternal(line);
+}
+
+bool TreeSocket::PreProcessOldProtocolMessage(User*& who, std::string& cmd, CommandBase::Params& params)
+{
+	if (irc::equals(cmd, "FHOST") || irc::equals(cmd, "FIDENT"))
+	{
+		if (params.size() < 2)
+			params.push_back("*");
+	}
+	else if (irc::equals(cmd, "SVSJOIN") || irc::equals(cmd, "SVSNICK") || irc::equals(cmd, "SVSPART"))
+	{
+		if (params.empty())
+			return false; // Malformed.
+
+		auto* target = ServerInstance->Users.FindUUID(params[0]);
+		if (!target)
+			return false; // User gone.
+
+		params.insert(params.begin(), { target->uuid.substr(0, 3), cmd });
+		cmd = "ENCAP";
+	}
+	return true;
+}