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RelayClient.cc
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/* vim: set et ts=4 sw=4 ft=cpp:
*
* Copyright (C) 2011 James McLaughlin. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "Lacewing.h"
#include "FrameBuilder.h"
#include "FrameReader.h"
#include "MessageReader.h"
#include <vector>
#include <algorithm>
namespace lacewing
{
struct relayclientinternal
{
lacewing::relayclient & client;
lacewing::client socket;
lacewing::udp udp;
lacewing::timer udphellotimer;
relayclient::handler_connect handler_connect;
relayclient::handler_connectiondenied handler_connectiondenied;
relayclient::handler_disconnect handler_disconnect;
relayclient::handler_message_server handler_message_server;
relayclient::handler_message_channel handler_message_channel;
relayclient::handler_message_peer handler_message_peer;
relayclient::handler_message_serverchannel handler_message_serverchannel;
relayclient::handler_error handler_error;
relayclient::handler_channel_join handler_channel_join;
relayclient::handler_channel_joindenied handler_channel_joindenied;
relayclient::handler_channel_leave handler_channel_leave;
relayclient::handler_channel_leavedenied handler_channel_leavedenied;
relayclient::handler_name_set handler_name_set;
relayclient::handler_name_changed handler_name_changed;
relayclient::handler_name_denied handler_name_denied;
relayclient::handler_peer_connect handler_peer_connect;
relayclient::handler_peer_disconnect handler_peer_disconnect;
relayclient::handler_peer_changename handler_peer_changename;
relayclient::handler_channellistreceived handler_channellistreceived;
relayclientinternal(relayclient &_client, pump _eventpump);
framereader reader;
static bool messagehandler(void * tag, lw_ui8 type, const char * message, size_t size);
bool messagehandler(lw_ui8 type, const char * message, size_t size, bool blasted);
static void udphellotick(lacewing::timer timer);
void udphellotick();
/// <summary> searches for the first channel by id number. </summary>
/// <param name="id"> id to look up. </param>
/// <returns> null if it fails, else the matching channel. </returns>
std::shared_ptr<relayclient::channel> findchannelbyid(lw_ui16 id);
// message: used by lacewing internal (e.g. automatic ping response)
// messageMF: used by program
framebuilder message, messageMF;
std::vector<std::shared_ptr<relayclient::channellisting>> channellist;
/// <summary> Empties the channel list. </summary>
void clearchannellist()
{
lacewing::writelock wl = client.lock.createWriteLock();
channellist.clear();
}
void clear();
std::string name;
lw_ui16 id = 0xFFFF;
std::string welcomemessage;
// Indicates connected on a Lacewing level; full Lacewing TCP/UDP handshake finished
bool connected = false;
std::vector<std::shared_ptr<relayclient::channel>> channels;
void initsocket(lacewing::pump pump);
void disconnect_mark_all_as_readonly();
~relayclientinternal() noexcept(false)
{
lacewing::writelock wl = client.lock.createWriteLock();
clear();
udphellotimer->on_tick(nullptr);
lacewing::timer_delete(udphellotimer);
udphellotimer = nullptr;
// Lacewing will self-delete on disconnect... we replace with a new, blank client
if (socket)
{
socket->on_connect(nullptr);
socket->on_disconnect(nullptr);
socket->on_data(nullptr);
socket->on_error(nullptr);
lacewing::stream_delete(socket);
socket = nullptr;
}
// UDP has no "close" as it's a connectionless protocol, so Lacewing doesn't clean it up automatically
udp->on_data(nullptr);
udp->on_error(nullptr);
lacewing::udp_delete(udp);
udp = nullptr;
}
};
void relayclientinternal::clear()
{
lacewing::writelock cliWriteLock = client.lock.createWriteLock();
channels.clear();
clearchannellist();
id = 0xffff;
connected = false;
name.clear();
}
void relayclientinternal::disconnect_mark_all_as_readonly()
{
// Private members
auto cliWriteLock = client.lock.createWriteLock();
for (auto& ch : channels)
{
ch->_readonly = true;
for (auto& p : ch->peers)
p->_readonly = true;
}
}
/// <summary> searches for the first channel by id number. </summary>
/// <param name="id"> id to look up. </param>
/// <returns> null if it fails, else the matching channel. </returns>
std::shared_ptr<relayclient::channel> relayclientinternal::findchannelbyid(lw_ui16 id)
{
lacewing::readlock rl = this->client.lock.createReadLock();
auto i = std::find_if(channels.cbegin(), channels.cend(),
[id](const std::shared_ptr<const relayclient::channel> &c) { return c->id() == id; });
return i == channels.cend() ? nullptr : *i;
}
void handlerconnect(client socket)
{
relayclientinternal &internal = *(relayclientinternal *)socket->tag();
/* opening 0 byte */
socket->write("", 1);
// internal.udp->host(socket->server_address(), nullptr, 0U);
framebuilder &message = internal.message;
message.addheader(0, 0); /* request */
message.add<lw_ui8>(0); /* connect */
message.add("revision 3"sv); /* version, not null terminated */
message.send(internal.socket);
}
void handlerdisconnect(client socket)
{
relayclientinternal &internal = *(relayclientinternal *)socket->tag();
// offsetof(lw_stream, flags) == 20
// if dead or closing, it's an immediate disconnect
//bool handlerNeedsRunning = (((lw_ui8 *)socket)[20] & (8 | 4 /*lwp_stream_flag_dead | lwp_stream_flag_closing */)) != 0;
internal.udphellotimer->stop();
internal.connected = false;
internal.disconnect_mark_all_as_readonly();
if (internal.handler_disconnect)// && handlerNeedsRunning)
internal.handler_disconnect(internal.client);
internal.clear();
// Lacewing self-deletes streams on socket close - while client variable is valid here,
// it won't be after calling function continues. We quietly replace it with something usable.
internal.socket = nullptr;
internal.initsocket(socket->pump());
}
void handlerreceive(client socket, const char * data, size_t size)
{
relayclientinternal &internal = *(relayclientinternal *)socket->tag();
// To prevent stack overflow from a big TCP packet with multiple Lacewing messages, I've reworked
// this function to prevent it recursively calling process() after shaving a message off.
const char * dataPtr = data;
size_t sizePtr = size;
constexpr size_t maxMessagesInOneProcess = 300;
for (size_t i = 0; i < maxMessagesInOneProcess; i++)
{
// Ran out of messages, or error occurred and rest should be ignored; exit quietly
if (!internal.reader.process(&dataPtr, &sizePtr))
return;
}
if (internal.handler_error)
{
lacewing::error error = lacewing::error_new();
error->add("Overload of message stack; got more than %zu messages in one packet (sized %zu) from server.",
maxMessagesInOneProcess, size);
internal.handler_error(internal.client, error);
lacewing::error_delete(error);
}
}
void handlererror(client socket, error error)
{
relayclientinternal &internal = *(relayclientinternal *)socket->tag();
error->add("socket error");
if (internal.handler_error)
internal.handler_error(internal.client, error);
}
void handlerclientudpreceive(udp udp, address address, char * data, size_t size)
{
relayclientinternal &internal = *(relayclientinternal *)udp->tag();
if (!size)
return;
internal.messagehandler(*data, data + 1, size - 1, true);
}
void handlerclientudperror(udp udp, error error)
{
relayclientinternal &internal = *(relayclientinternal *)udp->tag();
error->add("socket error");
if (internal.handler_error)
internal.handler_error(internal.client, error);
}
relayclient::relayclient(pump eventpump)
{
lacewing::writelock wl = this->lock.createWriteLock();
// relayclient is just an idiot-proof layer hiding relayclientinternal
lacewing::relayclientinternal * r = new lacewing::relayclientinternal(*this, eventpump);
tag = nullptr;
internaltag = r;
}
relayclient::~relayclient()
{
lacewing::writelock wl = this->lock.createWriteLock();
delete ((relayclientinternal *)internaltag);
internaltag = nullptr;
wl.lw_unlock();
}
void relayclient::connect(const char * host, lw_ui16 port)
{
lacewing::writelock wl = this->lock.createWriteLock();
relayclientinternal &internal = *((relayclientinternal *)internaltag);
internal.socket->connect(host, port);
}
void relayclient::connect(address address)
{
lacewing::writelock wl = this->lock.createWriteLock();
if (!address->port())
address->port(6121);
// Socket will fuss if we're connecting/connected already, so don't bother checking.
relayclientinternal &internal = *((relayclientinternal *)internaltag);
internal.socket->connect(address);
}
void relayclient::disconnect()
{
relayclientinternal &internal = *((relayclientinternal *)internaltag);
// If you run relayclient::disconnect() while a connection/connect attempt isn't pending,
// the disconnect is effectively "stored" inside the socket, causing the next
// successful connection to be met with an instant disconnect.
// So, make it a no-op when not trying to use a connection yet.
if (!internal.socket->connecting() && !internal.socket->connected())
return;
internal.connected = false;
if (internal.udphellotimer)
internal.udphellotimer->stop();
lacewing::writelock wl = this->lock.createWriteLock();
// In future versions we could use a timer to immediate close after a while,
// in case server is lagging with the polite close response, but we'd have
// to watch it on app close.
internal.socket->close(lw_false);
// lacewing::stream_delete(internal.socket);
// internal.socket = nullptr;
internal.udp->unhost();
// lacewing::udp_delete(internal.udp);
// internal.udp = nullptr;
}
bool relayclient::connected()
{
lacewing::readlock rl = this->lock.createReadLock();
return ((relayclientinternal *)internaltag)->connected;
}
bool relayclient::connecting()
{
lacewing::readlock rl = this->lock.createReadLock();
relayclientinternal &internal = *((relayclientinternal *)internaltag);
// RelayClient takes a bit longer than raw socket to make a connection, so we check both.
return (!connected()) && (internal.socket->connected() || internal.socket->connecting());
}
std::string relayclient::name() const
{
lacewing::readlock rl = this->lock.createReadLock();
return ((relayclientinternal *)internaltag)->name;
}
void relayclient::listchannels()
{
lacewing::writelock wl = this->lock.createWriteLock();
relayclientinternal &internal = *((relayclientinternal *)internaltag);
framebuilder &message = internal.messageMF;
message.addheader(0, 0); /* request */
message.add <lw_ui8>(4); /* channellist */
message.send(internal.socket);
}
void relayclient::name(std::string_view name)
{
lacewing::writelock wl = lock.createWriteLock();
relayclientinternal & internal = *((relayclientinternal *)internaltag);
framebuilder & message = internal.messageMF;
if (name.empty())
{
error error = error_new();
error->add("can't set a blank name");
if (internal.handler_error)
internal.handler_error(*this, error);
return;
}
message.addheader(0, 0); /* request */
message.add <lw_ui8>(1); /* setname */
message.add (name);
message.send(internal.socket);
}
void relayclient::join(std::string_view channelName, bool hidden, bool autoclose)
{
relayclientinternal &internal = *((relayclientinternal *)internaltag);
if (name().empty())
{
error error = lacewing::error_new();
error->add("set a name before joining a channel");
if (internal.handler_error)
internal.handler_error(*this, error);
lacewing::error_delete(error);
return;
}
if (channelName.empty())
{
error error = lacewing::error_new();
error->add("can't join a channel with a blank name");
if (internal.handler_error)
internal.handler_error(*this, error);
lacewing::error_delete(error);
return;
}
lacewing::writelock wl = lock.createWriteLock();
framebuilder & message = internal.messageMF;
message.addheader (0, 0); /* request */
message.add <lw_ui8>(2); /* joinchannel */
message.add <lw_ui8>((hidden ? 1 : 0) | (autoclose ? 2 : 0));
message.add (channelName);
message.send(internal.socket);
}
void relayclient::sendserver(lw_ui8 subchannel, std::string_view data, lw_ui8 variant) const
{
relayclientinternal &internal = *((relayclientinternal *)internaltag);
framebuilder &message = internal.messageMF;
lacewing::writelock wl = lock.createWriteLock();
message.addheader (1, variant); /* binaryservermessage */
message.add (subchannel);
message.add (data);
message.send(internal.socket);
}
void relayclient::blastserver(lw_ui8 subchannel, std::string_view data, lw_ui8 variant) const
{
relayclientinternal &internal = *((relayclientinternal *)internaltag);
framebuilder &message = internal.messageMF;
lacewing::writelock wl = lock.createWriteLock();
message.addheader (1, variant, true, internal.id); /* binaryservermessage */
message.add (subchannel);
message.add (data);
message.send(internal.udp, internal.socket->server_address());
}
const std::vector<std::shared_ptr<relayclient::channel>> & relayclient::getchannels() const
{
lock.checkHoldsRead();
return ((relayclientinternal *)internaltag)->channels;
}
void relayclient::channel::send(lw_ui8 subchannel, std::string_view data, lw_ui8 variant) const
{
if (peers.empty() || _readonly)
return;
relayclientinternal &clientinternal = client;
framebuilder &message = clientinternal.messageMF;
lacewing::writelock wl = lock.createWriteLock();
message.addheader (2, variant); /* binarychannelmessage */
message.add <lw_ui8>(subchannel);
message.add <lw_ui16>(this->_id);
message.add (data);
message.send(clientinternal.socket);
}
void relayclient::channel::blast(lw_ui8 subchannel, std::string_view data, lw_ui8 variant) const
{
if (peers.empty() || _readonly)
return;
relayclientinternal &clientinternal = client;
framebuilder &message = clientinternal.messageMF;
lacewing::writelock wl = lock.createWriteLock();
message.addheader(2, variant, true, clientinternal.id); /* binarychannelmessage */
message.add <lw_ui8>(subchannel);
message.add <lw_ui16>(this->_id);
message.add (data);
message.send(clientinternal.udp, clientinternal.socket->server_address());
}
void relayclient::channel::peer::send(lw_ui8 subchannel, std::string_view data, lw_ui8 variant) const
{
if (_readonly)
return;
relayclientinternal &clientinternal = channel.client;
framebuilder &message = clientinternal.messageMF;
lacewing::writelock wl = lock.createWriteLock();
message.addheader (3, variant); /* binarypeermessage */
message.add <lw_ui8>(subchannel);
message.add <lw_ui16>(channel._id);
message.add <lw_ui16>(_id);
message.add (data);
message.send(clientinternal.socket);
}
void relayclient::channel::peer::blast(lw_ui8 subchannel, std::string_view data, lw_ui8 variant) const
{
if (_readonly)
return;
relayclientinternal &internal = channel.client;
framebuilder &message = internal.messageMF;
lacewing::writelock wl = lock.createWriteLock();
message.addheader(3, variant, true, internal.id); /* binarypeermessage */
message.add <lw_ui8>(subchannel);
message.add <lw_ui16>(channel._id);
message.add <lw_ui16>(_id);
message.add (data);
message.send(internal.udp, internal.socket->server_address());
}
void relayclient::channel::leave() const
{
// Leaving channel aborted: already in readonly mode, which means we've already left
if (_readonly)
return;
relayclientinternal &clientinternal = client;
framebuilder &message = clientinternal.messageMF;
lacewing::writelock wl = lock.createWriteLock();
message.addheader(0, 0); /* request */
message.add <lw_ui8>(3); /* leavechannel */
message.add <lw_ui16>(_id);
message.send(clientinternal.socket);
}
std::string relayclient::channel::name() const
{
lacewing::readlock rl = lock.createReadLock();
return _name;
}
std::string relayclient::channel::namesimplified() const
{
lacewing::readlock rl = lock.createReadLock();
return _namesimplified;
}
int relayclient::channel::peercount() const
{
lacewing::readlock rl = lock.createReadLock();
return peers.size();
}
lw_ui16 relayclient::channel::id() const
{
lacewing::readlock rl = lock.createReadLock();
return _id;
}
std::string relayclient::channel::peer::name() const
{
lacewing::readlock rl = lock.createReadLock();
return _name;
}
std::string relayclient::channel::peer::namesimplified() const
{
lacewing::readlock rl = lock.createReadLock();
return _namesimplified;
}
std::string relayclient::channel::peer::prevname() const
{
lacewing::readlock rl = lock.createReadLock();
return _prevname;
}
bool relayclient::channel::peer::readonly() const
{
// Atomic, no point changing it
return _readonly;
}
size_t relayclient::channelcount() const
{
lacewing::readlock rl = lock.createReadLock();
return ((relayclientinternal *)internaltag)->channels.size();
}
lw_ui16 relayclient::id() const
{
lacewing::readlock rl = lock.createReadLock();
return ((relayclientinternal *)internaltag)->id;
}
address relayclient::serveraddress()
{
lacewing::readlock rl = lock.createReadLock();
relayclientinternal &internal = *((relayclientinternal *)internaltag);
return internal.socket->server_address();
}
std::string relayclient::welcomemessage() const
{
lacewing::readlock rl = lock.createReadLock();
return ((relayclientinternal *)internaltag)->welcomemessage;
}
bool relayclientinternal::messagehandler(lw_ui8 type, const char * message, size_t size, bool blasted)
{
lw_ui8 messagetypeid = (type >> 4);
lw_ui8 variant = (type << 4);
variant >>= 4;
messagereader reader(message, size);
switch (messagetypeid)
{
case 0: /* response */
{
lw_ui8 responsetype = reader.get <lw_ui8>();
bool succeeded = reader.get <lw_ui8>() != 0;
if (reader.failed)
break;
switch (responsetype)
{
case 0: /* connect */
{
if (succeeded)
{
id = reader.get <lw_ui16>();
// Don't expect welcome message to be null terminated
const std::string_view welcomemessage = reader.getremaining();
if (reader.failed)
break;
this->welcomemessage = welcomemessage;
// If midway during connection when Disconnect is called, returned address can be null.
lacewing::address srvAddress = socket->server_address();
if (!srvAddress)
break;
srvAddress->resolve();
udp->host(srvAddress);
udphellotick();
udphellotimer->start(500); // see udphellotick
/* the connect handler will be called on udp acknowledged */
}
else
{
if (handler_connectiondenied)
{
// Not null terminated, can't use getremaining()
const std::string_view denyReason = reader.get(reader.bytesleft());
if (reader.failed)
break;
handler_connectiondenied(client, denyReason);
}
}
break;
}
case 1: /* setname */
{
const lw_ui8 namelength = reader.get <lw_ui8>();
const std::string_view name = reader.get(namelength);
if (reader.failed)
break;
if (succeeded)
{
if (this->name.empty())
{
this->name = name;
if (handler_name_set)
handler_name_set(client);
}
else
{
const std::string oldname = this->name;
this->name = name;
if (handler_name_changed)
handler_name_changed(client, oldname);
}
}
else
{
if (handler_name_denied)
{
// Not null terminated, can't use getremaining()
const std::string_view denyReason = reader.get(reader.bytesleft());
if (reader.failed)
break;
handler_name_denied(client, name, denyReason);
}
}
break;
}
case 2: /* joinchannel */
{
const lw_ui8 flags = succeeded ? reader.get <lw_ui8>() : 0;
const lw_ui8 namelength = reader.get <lw_ui8>();
const std::string_view name = reader.get(namelength);
if (reader.failed)
{
lw_trace("Reader failed getting channel name.");
break;
}
if (succeeded)
{
const lw_ui16 channelid = reader.get <lw_ui16>();
if (reader.failed)
{
lw_trace("Reader failed getting channel ID.");
break;
}
auto channel = std::make_shared<relayclient::channel>(*this);
auto channelWriteLock = channel->lock.createWriteLock();
channel->_id = channelid;
channel->_name = name;
channel->_namesimplified = lw_u8str_simplify(name);
channel->_ischannelmaster = (flags & 1) != 0;
for (; reader.bytesleft() > 0;)
{
lw_ui16 peerid = reader.get <lw_ui16>();
lw_ui8 flags2 = reader.get <lw_ui8>();
lw_ui8 namelength2 = reader.get <lw_ui8>();
std::string_view name2 = reader.get(namelength2);
if (reader.failed)
break;
channel->addnewpeer(peerid, flags2, name2);
}
channelWriteLock.lw_unlock();
{
lacewing::writelock serverWriteLock = this->client.lock.createWriteLock();
channels.push_back(channel);
}
if (handler_channel_join)
handler_channel_join(client, channel);
}
else
{
if (handler_channel_joindenied)
{
const std::string_view denyReason = reader.getremaining();
if (reader.failed)
break;
handler_channel_joindenied(client, name, denyReason);
}
}
break;
}
case 3: /* leavechannel */
{
const lw_ui16 id = reader.get<lw_ui16>();
if (reader.failed)
break;
const std::shared_ptr<relayclient::channel> channel = findchannelbyid(id);
if (!channel)
{
reader.failed = true;
break;
}
if (succeeded)
{
auto channelWriteLock = channel->lock.createWriteLock();
channel->_readonly = true;
for (auto& p : channel->peers)
p->_readonly = true;
channelWriteLock.lw_unlock();
if (handler_channel_leave)
handler_channel_leave(client, channel);
// Handler BEFORE finding it in channel list, in case leave handler calls disconnect.
if (!connected)
break;
// LW_ESCALATION_NOTE
// auto relayCliReadLock = this->client.lock.createReadLock();
auto relayCliWriteLock = client.lock.createWriteLock();
const auto i = std::find(channels.cbegin(), channels.cend(), channel);
if (i == channels.cend())
break; // Not found...
// LW_ESCALATION_NOTE
// auto relayCliWriteLock = rl.lw_upgrade();
channels.erase(i);
}
else
{
if (handler_channel_leavedenied)
{
// Not null terminated, can't use getremaining()
const std::string_view denyReason = reader.get(reader.bytesleft());
if (reader.failed)
break;
handler_channel_leavedenied(client, channel, denyReason);
}
}
break;
}
case 4: /* channellist */
{
auto relayCliWriteLock = this->client.lock.createWriteLock();
clearchannellist();
if (!succeeded)
{
lacewing::error error = error_new();
error->add("Channel listing request failed, got error %s from server.", std::string(reader.getremaining()).c_str());
this->handler_error(client, error);
error_delete(error);
return false;
}
for (; reader.bytesleft() > 0;)
{
const lw_ui16 peercount = reader.get <lw_ui16>();
const lw_ui8 namelength = reader.get <lw_ui8>();
const std::string_view name = reader.get(namelength);
if (reader.failed)
break;
auto listing = std::make_shared<relayclient::channellisting>();
listing->_name = name;
listing->_namesimplified = lw_u8str_simplify(name);
listing->_peercount = peercount;
listing->internaltag = this;
channellist.push_back(listing);
}
relayCliWriteLock.lw_unlock();
if (handler_channellistreceived)
handler_channellistreceived(client);
break;
}
default:
{
lacewing::error error = error_new();
error->add("Unrecognised response message received. Response type ID was %i, but expected response type IDs 0-4. Discarding message.");
this->handler_error(client, error);
error_delete(error);
return true;
}
}
break;
}
// Used in getremaining() for data messages.
// Text messages are not null-terminated, binary messages can be 0-sized too,
// but the number messages (variant 1) are 4 bytes in size.
#define Require4BytesForNumberMessages (variant == 1 ? sizeof(int) : 0), false, false, (variant == 1 ? sizeof(int) : 0xFFFFFFFFU)
case 1: /* binaryservermessage */
{
const lw_ui8 subchannel = reader.get <lw_ui8>();
const std::string_view data = reader.getremaining(Require4BytesForNumberMessages);
if (reader.failed)
break;
if (handler_message_server)
handler_message_server(client, blasted, subchannel, data, variant);
break;
}
case 2: /* binarychannelmessage */
{
const lw_ui8 subchannel = reader.get <lw_ui8>();
const lw_ui16 channel = reader.get<lw_ui16>();
const lw_ui16 peer = reader.get<lw_ui16>();
if (reader.failed)
break;
const auto channel2 = findchannelbyid(channel);
if (reader.failed || !channel2)
break;
std::shared_ptr<relayclient::channel::peer> peer2;
{
auto channelReadLock = channel2->lock.createReadLock();
peer2 = channel2->findpeerbyid(peer);
}
// A UDP message might be faster than the TCP Channel Join/Peer Connect message,
// making a message for a channel that's OK'd to join on server side be delivered
// before the "this" client receives its channel join message.
// Thus, invalid channel.
if (!peer2 || channel2->_readonly || peer2->_readonly)
break;
const std::string_view data = reader.getremaining(Require4BytesForNumberMessages);
if (reader.failed)
break;
if (handler_message_channel)
handler_message_channel(client, channel2, peer2, blasted,
subchannel, data, variant);
break;
}
case 3: /* binarypeermessage */
{
const lw_ui8 subchannel = reader.get <lw_ui8>();
const lw_ui16 channel = reader.get<lw_ui16>();
const lw_ui16 peer = reader.get<lw_ui16>();
if (reader.failed)
break;
const auto channel2 = findchannelbyid(channel);
if (reader.failed || !channel2)
break;
std::shared_ptr<relayclient::channel::peer> peer2;
{
auto channelReadLock = channel2->lock.createReadLock();
peer2 = channel2->findpeerbyid(peer);
}
// A UDP message might be faster than the TCP Channel Join/Peer Connect message,
// making a message for a channel that's OK'd to join on server side be delivered
// before the "this" client receives its channel join message.
// Thus, invalid channel.
if (!peer2 || channel2->_readonly || peer2->_readonly)
{
if (!blasted)
{
lacewing::error error = error_new();
error->add("Peer message received from invalid %s. Discarding.", channel2 ? "peer" : "channel", 1);
this->handler_error(client, error);
error_delete(error);
return true; // Trust client, though
}
break;
}