From b49846ebb97c4e192cafe056554fb3efdd51d4de Mon Sep 17 00:00:00 2001
From: Sadie Powell
Date: Wed, 20 May 2020 02:09:14 +0100
Subject: Rip out compatibility code for the 2.0 protocol.

---
 src/modules/m_spanningtree/compat.cpp | 609 ----------------------------------
 1 file changed, 609 deletions(-)
 delete mode 100644 src/modules/m_spanningtree/compat.cpp

(limited to 'src/modules/m_spanningtree/compat.cpp')

diff --git a/src/modules/m_spanningtree/compat.cpp b/src/modules/m_spanningtree/compat.cpp
deleted file mode 100644
index d6349fb6e..000000000
--- a/src/modules/m_spanningtree/compat.cpp
+++ /dev/null
@@ -1,609 +0,0 @@
-/*
- * InspIRCd -- Internet Relay Chat Daemon
- *
- *   Copyright (C) 2018 Matt Schatz <genius3000@g3k.solutions>
- *   Copyright (C) 2013-2016 Attila Molnar <attilamolnar@hush.com>
- *   Copyright (C) 2013, 2018-2019 Sadie Powell <sadie@witchery.services>
- *   Copyright (C) 2012 Robby <robby@chatbelgie.be>
- *   Copyright (C) 2010 Craig Edwards <brain@inspircd.org>
- *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
- *
- * 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"
-#include "treesocket.h"
-#include "treeserver.h"
-
-static std::string newline("\n");
-
-void TreeSocket::WriteLineNoCompat(const std::string& line)
-{
-	ServerInstance->Logs.Log(MODNAME, LOG_RAWIO, "S[%d] O %s", this->GetFd(), line.c_str());
-	this->WriteData(line);
-	this->WriteData(newline);
-}
-
-void TreeSocket::WriteLine(const std::string& original_line)
-{
-	if (LinkState == CONNECTED)
-	{
-		if (proto_version != PROTO_NEWEST)
-		{
-			std::string line = original_line;
-			std::string::size_type a = line.find(' ');
-			if (line[0] == '@')
-			{
-				// The line contains tags which the 1202 protocol can't handle.
-				line.erase(0, a + 1);
-				a = line.find(' ');
-			}
-			std::string::size_type b = line.find(' ', a + 1);
-			std::string command(line, a + 1, b-a-1);
-			// now try to find a translation entry
-			if (proto_version < PROTO_INSPIRCD_30)
-			{
-				if (command == "IJOIN")
-				{
-					// Convert
-					// :<uid> IJOIN <chan> <membid> [<ts> [<flags>]]
-					// to
-					// :<sid> FJOIN <chan> <ts> + [<flags>],<uuid>
-					std::string::size_type c = line.find(' ', b + 1);
-					if (c == std::string::npos)
-						return;
-
-					std::string::size_type d = line.find(' ', c + 1);
-					// Erase membership id first
-					line.erase(c, d-c);
-					if (d == std::string::npos)
-					{
-						// No TS or modes in the command
-						// :22DAAAAAB IJOIN #chan
-						const std::string channame(line, b+1, c-b-1);
-						Channel* chan = ServerInstance->FindChan(channame);
-						if (!chan)
-							return;
-
-						line.push_back(' ');
-						line.append(ConvToStr(chan->age));
-						line.append(" + ,");
-					}
-					else
-					{
-						d = line.find(' ', c + 1);
-						if (d == std::string::npos)
-						{
-							// TS present, no modes
-							// :22DAAAAAC IJOIN #chan 12345
-							line.append(" + ,");
-						}
-						else
-						{
-							// Both TS and modes are present
-							// :22DAAAAAC IJOIN #chan 12345 ov
-							std::string::size_type e = line.find(' ', d + 1);
-							if (e != std::string::npos)
-								line.erase(e);
-
-							line.insert(d, " +");
-							line.push_back(',');
-						}
-					}
-
-					// Move the uuid to the end and replace the I with an F
-					line.append(line.substr(1, 9));
-					line.erase(4, 6);
-					line[5] = 'F';
-				}
-				else if (command == "RESYNC")
-					return;
-				else if (command == "METADATA")
-				{
-					// Drop TS for channel METADATA, translate METADATA operquit into an OPERQUIT command
-					// :sid METADATA #target TS extname ...
-					//     A        B       C  D
-					if (b == std::string::npos)
-						return;
-
-					std::string::size_type c = line.find(' ', b + 1);
-					if (c == std::string::npos)
-						return;
-
-					std::string::size_type d = line.find(' ', c + 1);
-					if (d == std::string::npos)
-						return;
-
-					if (line[b + 1] == '#')
-					{
-						// We're sending channel metadata
-						line.erase(c, d-c);
-					}
-					else if (!line.compare(c, d-c, " operquit", 9))
-					{
-						// ":22D METADATA 22DAAAAAX operquit :message" -> ":22DAAAAAX OPERQUIT :message"
-						line = ":" + line.substr(b+1, c-b) + "OPERQUIT" + line.substr(d);
-					}
-				}
-				else if (command == "FTOPIC")
-				{
-					// Drop channel TS for FTOPIC
-					// :sid FTOPIC #target TS TopicTS setter :newtopic
-					//     A      B       C  D       E      F
-					// :uid FTOPIC #target TS TopicTS :newtopic
-					//     A      B       C  D       E
-					if (b == std::string::npos)
-						return;
-
-					std::string::size_type c = line.find(' ', b + 1);
-					if (c == std::string::npos)
-						return;
-
-					std::string::size_type d = line.find(' ', c + 1);
-					if (d == std::string::npos)
-						return;
-
-					std::string::size_type e = line.find(' ', d + 1);
-					if (line[e+1] == ':')
-					{
-						line.erase(c, e-c);
-						line.erase(a+1, 1);
-					}
-					else
-						line.erase(c, d-c);
-				}
-				else if ((command == "PING") || (command == "PONG"))
-				{
-					// :22D PING 20D
-					if (line.length() < 13)
-						return;
-
-					// Insert the source SID (and a space) between the command and the first parameter
-					line.insert(10, line.substr(1, 4));
-				}
-				else if (command == "OPERTYPE")
-				{
-					std::string::size_type colon = line.find(':', b);
-					if (colon != std::string::npos)
-					{
-						for (std::string::iterator i = line.begin()+colon; i != line.end(); ++i)
-						{
-							if (*i == ' ')
-								*i = '_';
-						}
-						line.erase(colon, 1);
-					}
-				}
-				else if (command == "INVITE")
-				{
-					// :22D INVITE 22DAAAAAN #chan TS ExpirationTime
-					//     A      B         C     D  E
-					if (b == std::string::npos)
-						return;
-
-					std::string::size_type c = line.find(' ', b + 1);
-					if (c == std::string::npos)
-						return;
-
-					std::string::size_type d = line.find(' ', c + 1);
-					if (d == std::string::npos)
-						return;
-
-					std::string::size_type e = line.find(' ', d + 1);
-					// If there is no expiration time then everything will be erased from 'd'
-					line.erase(d, e-d);
-				}
-				else if (command == "FJOIN")
-				{
-					// Strip membership ids
-					// :22D FJOIN #chan 1234 +f 4:3 :o,22DAAAAAB:15 o,22DAAAAAA:15
-					// :22D FJOIN #chan 1234 +f 4:3 o,22DAAAAAB:15
-					// :22D FJOIN #chan 1234 +Pf 4:3 :
-
-					// If the last parameter is prefixed by a colon then it's a userlist which may have 0 or more users;
-					// if it isn't, then it is a single member
-					std::string::size_type spcolon = line.find(" :");
-					if (spcolon != std::string::npos)
-					{
-						spcolon++;
-						// Loop while there is a ':' in the userlist, this is never true if the channel is empty
-						std::string::size_type pos = std::string::npos;
-						while ((pos = line.rfind(':', pos-1)) > spcolon)
-						{
-							// Find the next space after the ':'
-							std::string::size_type sp = line.find(' ', pos);
-							// Erase characters between the ':' and the next space after it, including the ':' but not the space;
-							// if there is no next space, everything will be erased between pos and the end of the line
-							line.erase(pos, sp-pos);
-						}
-					}
-					else
-					{
-						// Last parameter is a single member
-						std::string::size_type sp = line.rfind(' ');
-						std::string::size_type colon = line.find(':', sp);
-						line.erase(colon);
-					}
-				}
-				else if (command == "KICK")
-				{
-					// Strip membership id if the KICK has one
-					if (b == std::string::npos)
-						return;
-
-					std::string::size_type c = line.find(' ', b + 1);
-					if (c == std::string::npos)
-						return;
-
-					std::string::size_type d = line.find(' ', c + 1);
-					if ((d < line.size()-1) && (original_line[d+1] != ':'))
-					{
-						// There is a third parameter which doesn't begin with a colon, erase it
-						std::string::size_type e = line.find(' ', d + 1);
-						line.erase(d, e-d);
-					}
-				}
-				else if (command == "SINFO")
-				{
-					// :22D SINFO version :InspIRCd-3.0
-					//     A     B       C
-					std::string::size_type c = line.find(' ', b + 1);
-					if (c == std::string::npos)
-						return;
-
-					// Only translating SINFO version, discard everything else
-					if (line.compare(b, 9, " version ", 9))
-						return;
-
-					line = line.substr(0, 5) + "VERSION" + line.substr(c);
-				}
-				else if (command == "SERVER")
-				{
-					// :001 SERVER inspircd.test 002 [<anything> ...] :description
-					//     A      B             C
-					std::string::size_type c = line.find(' ', b + 1);
-					if (c == std::string::npos)
-						return;
-
-					std::string::size_type d = c + 4;
-					std::string::size_type spcolon = line.find(" :", d);
-					if (spcolon == std::string::npos)
-						return;
-
-					line.erase(d, spcolon-d);
-					line.insert(c, " * 0");
-
-					if (burstsent)
-					{
-						WriteLineNoCompat(line);
-
-						// Synthesize a :<newserver> BURST <time> message
-						spcolon = line.find(" :");
-
-						TreeServer* const source = Utils->FindServerID(line.substr(spcolon-3, 3));
-						if (!source)
-							return;
-
-						line = CmdBuilder(source, "BURST").push_int(ServerInstance->Time()).str();
-					}
-				}
-				else if (command == "NUM")
-				{
-					// :<sid> NUM <numeric source sid> <target uuid> <3 digit number> <params>
-					// Translate to
-					// :<sid> PUSH <target uuid> :<numeric source name> <3 digit number> <target nick> <params>
-
-					TreeServer* const numericsource = Utils->FindServerID(line.substr(9, 3));
-					if (!numericsource)
-						return;
-
-					// The nick of the target is necessary for building the PUSH message
-					User* const target = ServerInstance->Users.FindUUID(line.substr(13, UIDGenerator::UUID_LENGTH));
-					if (!target)
-						return;
-
-					std::string push = InspIRCd::Format(":%.*s PUSH %s ::%s %.*s %s", 3, line.c_str()+1, target->uuid.c_str(), numericsource->GetName().c_str(), 3, line.c_str()+23, target->nick.c_str());
-					push.append(line, 26, std::string::npos);
-					push.swap(line);
-				}
-				else if (command == "TAGMSG")
-				{
-					// Drop IRCv3 tag messages as v2 has no message tag support.
-					return;
-				}
-			}
-			WriteLineNoCompat(line);
-			return;
-		}
-	}
-
-	WriteLineNoCompat(original_line);
-}
-
-namespace
-{
-	bool InsertCurrentChannelTS(CommandBase::Params& params, unsigned int chanindex = 0, unsigned int pos = 1)
-	{
-		Channel* chan = ServerInstance->FindChan(params[chanindex]);
-		if (!chan)
-			return false;
-
-		// Insert the current TS of the channel after the pos-th parameter
-		params.insert(params.begin()+pos, ConvToStr(chan->age));
-		return true;
-	}
-}
-
-bool TreeSocket::PreProcessOldProtocolMessage(User*& who, std::string& cmd, CommandBase::Params& params)
-{
-	if ((cmd == "METADATA") && (params.size() >= 3) && (params[0][0] == '#'))
-	{
-		// :20D METADATA #channel extname :extdata
-		return InsertCurrentChannelTS(params);
-	}
-	else if ((cmd == "FTOPIC") && (params.size() >= 4))
-	{
-		// :20D FTOPIC #channel 100 Attila :topic text
-		return InsertCurrentChannelTS(params);
-	}
-	else if ((cmd == "PING") || (cmd == "PONG"))
-	{
-		if (params.size() == 1)
-		{
-			// If it's a PING with 1 parameter, reply with a PONG now, if it's a PONG with 1 parameter (weird), do nothing
-			if (cmd[1] == 'I')
-				this->WriteData(":" + ServerInstance->Config->GetSID() + " PONG " + params[0] + newline);
-
-			// Don't process this message further
-			return false;
-		}
-
-		// :20D PING 20D 22D
-		// :20D PONG 20D 22D
-		// Drop the first parameter
-		params.erase(params.begin());
-
-		// If the target is a server name, translate it to a SID
-		if (!InspIRCd::IsSID(params[0]))
-		{
-			TreeServer* server = Utils->FindServer(params[0]);
-			if (!server)
-			{
-				// We've no idea what this is, log and stop processing
-				ServerInstance->Logs.Log(MODNAME, LOG_DEFAULT, "Received a " + cmd + " with an unknown target: \"" + params[0] + "\", command dropped");
-				return false;
-			}
-
-			params[0] = server->GetId();
-		}
-	}
-	else if ((cmd == "GLINE") || (cmd == "KLINE") || (cmd == "ELINE") || (cmd == "ZLINE") || (cmd == "QLINE"))
-	{
-		// Fix undocumented protocol usage: translate GLINE, ZLINE, etc. into ADDLINE or DELLINE
-		if ((params.size() != 1) && (params.size() != 3))
-			return false;
-
-		CommandBase::Params p;
-		p.push_back(cmd.substr(0, 1));
-		p.push_back(params[0]);
-
-		if (params.size() == 3)
-		{
-			cmd = "ADDLINE";
-			p.push_back(who->nick);
-			p.push_back(ConvToStr(ServerInstance->Time()));
-			p.push_back(ConvToStr(InspIRCd::Duration(params[1])));
-			p.push_back(params[2]);
-		}
-		else
-			cmd = "DELLINE";
-
-		params.swap(p);
-	}
-	else if (cmd == "SVSMODE")
-	{
-		cmd = "MODE";
-	}
-	else if (cmd == "OPERQUIT")
-	{
-		// Translate OPERQUIT into METADATA
-		if (params.empty())
-			return false;
-
-		cmd = "METADATA";
-		params.insert(params.begin(), who->uuid);
-		params.insert(params.begin()+1, "operquit");
-		who = MyRoot->ServerUser;
-	}
-	else if ((cmd == "TOPIC") && (params.size() >= 2))
-	{
-		// :20DAAAAAC TOPIC #chan :new topic
-		cmd = "FTOPIC";
-		if (!InsertCurrentChannelTS(params))
-			return false;
-
-		params.insert(params.begin()+2, ConvToStr(ServerInstance->Time()));
-	}
-	else if (cmd == "MODENOTICE")
-	{
-		// MODENOTICE is always supported by 2.0 but it's optional in 3.0.
-		params.insert(params.begin(), "*");
-		params.insert(params.begin()+1, cmd);
-		cmd = "ENCAP";
-	}
-	else if (cmd == "RULES")
-	{
-		return false;
-	}
-	else if (cmd == "INVITE")
-	{
-		// :20D INVITE 22DAAABBB #chan
-		// :20D INVITE 22DAAABBB #chan 123456789
-		// Insert channel timestamp after the channel name; the 3rd parameter, if there, is the invite expiration time
-		return InsertCurrentChannelTS(params, 1, 2);
-	}
-	else if (cmd == "VERSION")
-	{
-		// :20D VERSION :InspIRCd-2.0
-		// change to
-		// :20D SINFO version :InspIRCd-2.0
-		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;
-	}
-	else if ((cmd == "FMODE") && (params.size() >= 2))
-	{
-		// Translate user mode changes with timestamp to MODE
-		if (params[0][0] != '#')
-		{
-			User* user = ServerInstance->Users.FindUUID(params[0]);
-			if (!user)
-				return false;
-
-			// Emulate the old nonsensical behavior
-			if (user->age < ServerCommand::ExtractTS(params[1]))
-				return false;
-
-			cmd = "MODE";
-			params.erase(params.begin()+1);
-		}
-	}
-	else if ((cmd == "SERVER") && (params.size() > 4))
-	{
-		// This does not affect the initial SERVER line as it is sent before the link state is CONNECTED
-		// :20D SERVER <name> * 0 <sid> <desc>
-		// change to
-		// :20D SERVER <name> <sid> <desc>
-
-		params[1].swap(params[3]);
-		params.erase(params.begin()+2, params.begin()+4);
-
-		// If the source of this SERVER message or any of its parents are bursting, then new servers it
-		// introduces are not bursting.
-		bool bursting = false;
-		for (TreeServer* server = TreeServer::Get(who); server; server = server->GetParent())
-		{
-			if (server->IsBursting())
-			{
-				bursting = true;
-				break;
-			}
-		}
-
-		if (!bursting)
-			params.insert(params.begin()+2, "burst=" + ConvToStr(((uint64_t)ServerInstance->Time())*1000));
-	}
-	else if (cmd == "BURST")
-	{
-		// A server is introducing another one, drop unnecessary BURST
-		return false;
-	}
-	else if (cmd == "SVSWATCH")
-	{
-		// SVSWATCH was removed because nothing was using it, but better be sure
-		return false;
-	}
-	else if (cmd == "SVSSILENCE")
-	{
-		// SVSSILENCE was removed because nothing was using it, but better be sure
-		return false;
-	}
-	else if (cmd == "PUSH")
-	{
-		if ((params.size() != 2) || (!this->MyRoot))
-			return false; // Huh?
-
-		irc::tokenstream ts(params.back());
-
-		std::string srcstr;
-		ts.GetMiddle(srcstr);
-		srcstr.erase(0, 1);
-
-		std::string token;
-		ts.GetMiddle(token);
-
-		// See if it's a numeric being sent to the target via PUSH
-		unsigned int numeric_number = 0;
-		if (token.length() == 3)
-			numeric_number = ConvToNum<unsigned int>(token);
-
-		if ((numeric_number > 0) && (numeric_number < 1000))
-		{
-			// It's a numeric, translate to NUM
-
-			// srcstr must be a valid server name
-			TreeServer* const numericsource = Utils->FindServer(srcstr);
-			if (!numericsource)
-			{
-				ServerInstance->Logs.Log(MODNAME, LOG_DEBUG, "Unable to translate PUSH numeric %s to user %s from 1202 protocol server %s: source \"%s\" doesn't exist", token.c_str(), params[0].c_str(), this->MyRoot->GetName().c_str(), srcstr.c_str());
-				return false;
-			}
-
-			cmd = "NUM";
-
-			// Second parameter becomes the target uuid
-			params[0].swap(params[1]);
-			// Replace first param (now the PUSH payload, not needed) with the source sid
-			params[0] = numericsource->GetId();
-
-			params.push_back(InspIRCd::Format("%03u", numeric_number));
-
-			// Ignore the nickname in the numeric in PUSH
-			ts.GetMiddle(token);
-
-			// Rest of the tokens are the numeric parameters, add them to NUM
-			while (ts.GetTrailing(token))
-				params.push_back(token);
-		}
-		else if ((token == "PRIVMSG") || (token == "NOTICE"))
-		{
-			// Command is a PRIVMSG/NOTICE
-			cmd.swap(token);
-
-			// Check if the PRIVMSG/NOTICE target is a nickname
-			ts.GetMiddle(token);
-			if (token.c_str()[0] == '#')
-			{
-				ServerInstance->Logs.Log(MODNAME, LOG_DEBUG, "Unable to translate PUSH %s to user %s from 1202 protocol server %s, target \"%s\"", cmd.c_str(), params[0].c_str(), this->MyRoot->GetName().c_str(), token.c_str());
-				return false;
-			}
-
-			// Replace second parameter with the message
-			ts.GetTrailing(params[1]);
-		}
-		else
-		{
-			ServerInstance->Logs.Log(MODNAME, LOG_DEFAULT, "Unable to translate PUSH to user %s from 1202 protocol server %s", params[0].c_str(), this->MyRoot->GetName().c_str());
-			return false;
-		}
-
-		return true;
-	}
-
-	return true; // Passthru
-}
-- 
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