C++ parameterlist::back方法代码示例

/*
 * This is used after the other side of a connection has accepted our credentials.
 * They are then introducing themselves to us, BEFORE either of us burst. -- w
 */
bool TreeSocket::Outbound_Reply_Server(parameterlist &params)
{
	const Link* x = AuthRemote(params);
	if (x)
	{
		/*
		 * They're in WAIT_AUTH_2 (having accepted our credentials).
		 * Set our state to CONNECTED (since everything's peachy so far) and send our
		 * netburst to them, which will trigger their CONNECTED state, and BURST in reply.
		 *
		 * While we're at it, create a treeserver object so we know about them.
		 *   -- w
		 */
		FinishAuth(params[0], params[3], params.back(), x->Hidden);

		return true;
	}

	return false;
}

/*
 * Someone else is attempting to connect to us if this is called. Validate their credentials etc.
 *		-- w
 */
bool TreeSocket::Inbound_Server(parameterlist &params)
{
	const Link* x = AuthRemote(params);
	if (x)
	{
		// Save these for later, so when they accept our credentials (indicated by BURST) we remember them
		this->capab->hidden = x->Hidden;
		this->capab->sid = params[3];
		this->capab->description = params.back();
		this->capab->name = params[0];

		// Send our details: Our server name and description and hopcount of 0,
		// along with the sendpass from this block.
		this->WriteLine("SERVER "+ServerInstance->Config->ServerName+" "+this->MakePass(x->SendPass, this->GetTheirChallenge())+" 0 "+ServerInstance->Config->GetSID()+" :"+ServerInstance->Config->ServerDesc);

		// move to the next state, we are now waiting for THEM.
		this->LinkState = WAIT_AUTH_2;
		return true;
	}

	return false;
}

void TreeSocket::ProcessConnectedLine(std::string& prefix, std::string& command, parameterlist& params)
{
	User* who = FindSource(prefix, command);
	if (!who)
	{
		ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Command '%s' from unknown prefix '%s'! Dropping entire command.", command.c_str(), prefix.c_str());
		return;
	}

	/*
	 * Check for fake direction here, and drop any instances that are found.
	 * What is fake direction? Imagine the following server setup:
	 *    0AA <-> 0AB <-> 0AC
	 * Fake direction would be 0AC sending a message to 0AB claiming to be from
	 * 0AA, or something similar. Basically, a message taking a path that *cannot*
	 * be correct.
	 *
	 * When would this be seen?
	 * Well, hopefully never. It could be caused by race conditions, bugs, or
	 * "miscreant" servers, though, so let's check anyway. -- w
	 *
	 * We also check here for totally invalid prefixes (prefixes that are neither
	 * a valid SID or a valid UUID, so that invalid UUID or SID never makes it
	 * to the higher level functions. -- B
	 */
	TreeServer* const server = TreeServer::Get(who);
	if (server->GetSocket() != this)
	{
		ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Protocol violation: Fake direction '%s' from connection '%s'", prefix.c_str(), linkID.c_str());
		return;
	}

	// Translate commands coming from servers using an older protocol
	if (proto_version < ProtocolVersion)
	{
		if (!PreProcessOldProtocolMessage(who, command, params))
			return;
	}

	ServerCommand* scmd = Utils->Creator->CmdManager.GetHandler(command);
	CommandBase* cmdbase = scmd;
	Command* cmd = NULL;
	if (!scmd)
	{
		// Not a special server-to-server command
		cmd = ServerInstance->Parser.GetHandler(command);
		if (!cmd)
		{
			if (command == "ERROR")
			{
				this->Error(params);
				return;
			}

			throw ProtocolException("Unknown command");
		}
		cmdbase = cmd;
	}

	if (params.size() < cmdbase->min_params)
		throw ProtocolException("Insufficient parameters");

	if ((!params.empty()) && (params.back().empty()) && (!cmdbase->allow_empty_last_param))
	{
		// the last param is empty and the command handler doesn't allow that, check if there will be enough params if we drop the last
		if (params.size()-1 < cmdbase->min_params)
			return;
		params.pop_back();
	}

	CmdResult res;
	if (scmd)
		res = scmd->Handle(who, params);
	else
	{
		res = cmd->Handle(params, who);
		if (res == CMD_INVALID)
			throw ProtocolException("Error in command handler");
	}

	if (res == CMD_SUCCESS)
		Utils->RouteCommand(server->GetRoute(), cmdbase, params, who);
}

void TreeSocket::ProcessConnectedLine(std::string& prefix, std::string& command, parameterlist& params)
{
	User* who = ServerInstance->FindUUID(prefix);
	std::string direction;

	if (!who)
	{
		TreeServer* ServerSource = Utils->FindServer(prefix);
		if (prefix.empty())
			ServerSource = MyRoot;

		if (ServerSource)
		{
			who = ServerSource->ServerUser;
		}
		else
		{
			/* It is important that we don't close the link here, unknown prefix can occur
			 * due to various race conditions such as the KILL message for a user somehow
			 * crossing the users QUIT further upstream from the server. Thanks jilles!
			 */

			if ((prefix.length() == UIDGenerator::UUID_LENGTH) && (isdigit(prefix[0])) &&
				((command == "FMODE") || (command == "MODE") || (command == "KICK") || (command == "TOPIC") || (command == "KILL") || (command == "ADDLINE") || (command == "DELLINE")))
			{
				/* Special case, we cannot drop these commands as they've been committed already on a
				 * part of the network by the time we receive them, so in this scenario pretend the
				 * command came from a server to avoid desync.
				 */

				who = ServerInstance->FindUUID(prefix.substr(0, 3));
				if (!who)
					who = this->MyRoot->ServerUser;
			}
			else
			{
				ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Command '%s' from unknown prefix '%s'! Dropping entire command.",
					command.c_str(), prefix.c_str());
				return;
			}
		}
	}

	// Make sure prefix is still good
	direction = who->server;
	prefix = who->uuid;

	/*
	 * Check for fake direction here, and drop any instances that are found.
	 * What is fake direction? Imagine the following server setup:
	 *    0AA <-> 0AB <-> 0AC
	 * Fake direction would be 0AC sending a message to 0AB claiming to be from
	 * 0AA, or something similar. Basically, a message taking a path that *cannot*
	 * be correct.
	 *
	 * When would this be seen?
	 * Well, hopefully never. It could be caused by race conditions, bugs, or
	 * "miscreant" servers, though, so let's check anyway. -- w
	 *
	 * We also check here for totally invalid prefixes (prefixes that are neither
	 * a valid SID or a valid UUID, so that invalid UUID or SID never makes it
	 * to the higher level functions. -- B
	 */
	TreeServer* route_back_again = Utils->BestRouteTo(direction);
	if ((!route_back_again) || (route_back_again->GetSocket() != this))
	{
		if (route_back_again)
			ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Protocol violation: Fake direction '%s' from connection '%s'",
				prefix.c_str(),linkID.c_str());
		return;
	}

	// Translate commands coming from servers using an older protocol
	if (proto_version < ProtocolVersion)
	{
		if (!PreProcessOldProtocolMessage(who, command, params))
			return;
	}

	ServerCommand* scmd = Utils->Creator->CmdManager.GetHandler(command);
	CommandBase* cmdbase = scmd;
	Command* cmd;
	if (!scmd)
	{
		// Not a special server-to-server command
		cmd = ServerInstance->Parser->GetHandler(command);
		if (!cmd)
		{
			irc::stringjoiner pmlist(params);
			ServerInstance->Logs->Log(MODNAME, LOG_SPARSE, "Unrecognised S2S command :%s %s %s",
				who->uuid.c_str(), command.c_str(), pmlist.GetJoined().c_str());
			SendError("Unrecognised command '" + command + "' -- possibly loaded mismatched modules");
			return;
		}
		cmdbase = cmd;
	}

	if (params.size() < cmdbase->min_params)
	{
		irc::stringjoiner pmlist(params);
//.........这里部分代码省略.........

void TreeSocket::ProcessConnectedLine(std::string& prefix, std::string& command, parameterlist& params)
{
	User* who = ServerInstance->FindUUID(prefix);
	std::string direction;

	if (!who)
	{
		TreeServer* ServerSource = Utils->FindServer(prefix);
		if (prefix.empty())
			ServerSource = MyRoot;

		if (ServerSource)
		{
			who = ServerSource->ServerUser;
		}
		else
		{
			/* It is important that we don't close the link here, unknown prefix can occur
			 * due to various race conditions such as the KILL message for a user somehow
			 * crossing the users QUIT further upstream from the server. Thanks jilles!
			 */

			if ((prefix.length() == UUID_LENGTH-1) && (isdigit(prefix[0])) &&
				((command == "FMODE") || (command == "MODE") || (command == "KICK") || (command == "TOPIC") || (command == "KILL") || (command == "ADDLINE") || (command == "DELLINE")))
			{
				/* Special case, we cannot drop these commands as they've been committed already on a
				 * part of the network by the time we receive them, so in this scenario pretend the
				 * command came from a server to avoid desync.
				 */

				who = ServerInstance->FindUUID(prefix.substr(0, 3));
				if (!who)
					who = this->MyRoot->ServerUser;
			}
			else
			{
				ServerInstance->Logs->Log("m_spanningtree", DEBUG, "Command '%s' from unknown prefix '%s'! Dropping entire command.",
					command.c_str(), prefix.c_str());
				return;
			}
		}
	}

	// Make sure prefix is still good
	direction = who->server;
	prefix = who->uuid;

	/*
	 * Check for fake direction here, and drop any instances that are found.
	 * What is fake direction? Imagine the following server setup:
	 *    0AA <-> 0AB <-> 0AC
	 * Fake direction would be 0AC sending a message to 0AB claiming to be from
	 * 0AA, or something similar. Basically, a message taking a path that *cannot*
	 * be correct.
	 *
	 * When would this be seen?
	 * Well, hopefully never. It could be caused by race conditions, bugs, or
	 * "miscreant" servers, though, so let's check anyway. -- w
	 *
	 * We also check here for totally invalid prefixes (prefixes that are neither
	 * a valid SID or a valid UUID, so that invalid UUID or SID never makes it
	 * to the higher level functions. -- B
	 */
	TreeServer* route_back_again = Utils->BestRouteTo(direction);
	if ((!route_back_again) || (route_back_again->GetSocket() != this))
	{
		if (route_back_again)
			ServerInstance->Logs->Log("m_spanningtree",DEBUG,"Protocol violation: Fake direction '%s' from connection '%s'",
				prefix.c_str(),linkID.c_str());
		return;
	}

	/*
	 * First up, check for any malformed commands (e.g. MODE without a timestamp)
	 * and rewrite commands where necessary (SVSMODE -> MODE for services). -- w
	 */
	if (command == "SVSMODE") // This isn't in an "else if" so we still force FMODE for changes on channels.
		command = "MODE";

	// TODO move all this into Commands
	if (command == "MAP")
	{
		Utils->Creator->HandleMap(params, who);
	}
	else if (command == "SERVER")
	{
		this->RemoteServer(prefix,params);
	}
	else if (command == "ERROR")
	{
		this->Error(params);
	}
	else if (command == "AWAY")
	{
		this->Away(prefix,params);
	}
	else if (command == "PING")
	{
		this->LocalPing(prefix,params);
	}
//.........这里部分代码省略.........