104 lines
2.7 KiB
C++
104 lines
2.7 KiB
C++
|
/*
|
||
|
|
* Deskflow -- mouse and keyboard sharing utility
|
||
|
|
*
|
||
|
|
* SPDX-FileCopyrightText: Copyright (C) 2024 Symless Ltd.
|
||
|
|
* SPDX-License-Identifier: GPL-2.0
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "HelloBack.h"
|
||
|
|
|
||
|
|
#include "base/Log.h"
|
||
|
|
#include "deskflow/ProtocolUtil.h"
|
||
|
|
#include "deskflow/protocol_types.h"
|
||
|
|
|
||
|
|
#include <map>
|
||
|
|
#include <set>
|
||
|
|
|
||
|
|
namespace deskflow::client {
|
||
|
|
|
||
|
|
//
|
||
|
|
// HelloBack::Deps
|
||
|
|
//
|
||
|
|
|
||
|
|
void HelloBack::Deps::invalidHello()
|
||
|
|
{
|
||
|
|
m_invalidHello();
|
||
|
|
}
|
||
|
|
|
||
|
|
void HelloBack::Deps::incompatible(int major, int minor)
|
||
|
|
{
|
||
|
|
m_incompatible(major, minor);
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// HelloBack
|
||
|
|
//
|
||
|
|
|
||
|
|
void HelloBack::handleHello(deskflow::IStream *stream, const std::string &clientName) const
|
||
|
|
{
|
||
|
|
SInt16 serverMajor;
|
||
|
|
SInt16 serverMinor;
|
||
|
|
|
||
|
|
// as luck would have it, both "Synergy" and "Barrier" are 7 chars,
|
||
|
|
// so we eat 7 chars and then test for either protocol name.
|
||
|
|
// we cannot re-use `readf` to check for various hello messages,
|
||
|
|
// as `readf` eats bytes (advances the stream position reference).
|
||
|
|
std::string protocolName;
|
||
|
|
ProtocolUtil::readf(stream, kMsgHello, &protocolName, &serverMajor, &serverMinor);
|
||
|
|
|
||
|
|
if (protocolName != kSynergyProtocolName && protocolName != kBarrierProtocolName) {
|
||
|
|
m_deps->invalidHello();
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// check versions
|
||
|
|
LOG_DEBUG("got hello version %s, %d.%d", protocolName.c_str(), serverMajor, serverMinor);
|
||
|
|
|
||
|
|
const auto helloBackMajor = m_majorVersion;
|
||
|
|
auto helloBackMinor = m_minorVersion;
|
||
|
|
|
||
|
|
if (shouldDowngrade(serverMajor, serverMinor)) {
|
||
|
|
LOG_NOTE("downgrading to %d.%d protocol for server", serverMajor, serverMinor);
|
||
|
|
helloBackMinor = serverMinor;
|
||
|
|
} else if (serverMajor < m_majorVersion || (serverMajor == m_majorVersion && serverMinor < m_minorVersion)) {
|
||
|
|
m_deps->incompatible(serverMajor, serverMinor);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// say hello back with same protocol name and version
|
||
|
|
LOG_DEBUG(
|
||
|
|
"saying hello back with version %s %d.%d", //
|
||
|
|
protocolName.c_str(), helloBackMajor, helloBackMinor
|
||
|
|
);
|
||
|
|
|
||
|
|
// dynamically build write format for hello back since `ProtocolUtil::writef`
|
||
|
|
// doesn't support formatting fixed length strings yet.
|
||
|
|
std::string helloBackMessage = protocolName + kMsgHelloBackArgs;
|
||
|
|
ProtocolUtil::writef(stream, helloBackMessage.c_str(), helloBackMajor, helloBackMinor, &clientName);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool HelloBack::shouldDowngrade(int major, int minor) const
|
||
|
|
{
|
||
|
|
const std::map<int, std::set<int>> map{
|
||
|
|
// 1.6 is compatible with 1.7 and 1.8
|
||
|
|
{6, {7, 8}},
|
||
|
|
|
||
|
|
// 1.7 is compatible with 1.8
|
||
|
|
{7, {8}},
|
||
|
|
};
|
||
|
|
|
||
|
|
if (major == m_majorVersion) {
|
||
|
|
auto versions = map.find(minor);
|
||
|
|
if (versions != map.end()) {
|
||
|
|
auto compatibleVersions = versions->second;
|
||
|
|
if (compatibleVersions.find(m_minorVersion) != compatibleVersions.end()) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace deskflow::client
|