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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2021 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, "FRHOST"))
{
// FRHOST was introduced in PROTO_INSPIRCD_4; drop it.
return;
}
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);
}
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