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#pragma once
#include <LibCore/CEvent.h>
#include <LibCore/CEventLoop.h>
#include <LibCore/CIODevice.h>
#include <LibCore/CLocalSocket.h>
#include <LibCore/CNotifier.h>
#include <LibCore/CObject.h>
#include <LibIPC/IEndpoint.h>
#include <LibIPC/IMessage.h>
#include <errno.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
class IEvent : public CEvent {
public:
enum Type {
Invalid = 2000,
Disconnected,
};
IEvent() {}
explicit IEvent(Type type)
: CEvent(type)
{
}
};
class IDisconnectedEvent : public IEvent {
public:
explicit IDisconnectedEvent(int client_id)
: IEvent(Disconnected)
, m_client_id(client_id)
{
}
int client_id() const { return m_client_id; }
private:
int m_client_id { 0 };
};
template<typename T, class... Args>
NonnullRefPtr<T> new_client_connection(Args&&... args)
{
return T::construct(forward<Args>(args)...) /* arghs */;
}
template<typename Endpoint>
class IClientConnection : public CObject {
public:
IClientConnection(Endpoint& endpoint, CLocalSocket& socket, int client_id)
: m_endpoint(endpoint)
, m_socket(socket)
, m_client_id(client_id)
{
ASSERT(socket.is_connected());
ucred creds;
socklen_t creds_size = sizeof(creds);
if (getsockopt(m_socket->fd(), SOL_SOCKET, SO_PEERCRED, &creds, &creds_size) < 0) {
ASSERT_NOT_REACHED();
}
m_client_pid = creds.pid;
add_child(socket);
m_socket->on_ready_to_read = [this] { drain_messages_from_client(); };
}
virtual ~IClientConnection() override
{
}
void post_message(const IMessage& message)
{
auto buffer = message.encode();
int nwritten = write(m_socket->fd(), buffer.data(), (size_t)buffer.size());
if (nwritten < 0) {
switch (errno) {
case EPIPE:
dbg() << "Connection::post_message: Disconnected from peer";
shutdown();
return;
case EAGAIN:
dbg() << "Connection::post_message: Client buffer overflowed.";
did_misbehave();
return;
default:
perror("Connection::post_message write");
ASSERT_NOT_REACHED();
}
}
ASSERT(nwritten == buffer.size());
}
void drain_messages_from_client()
{
Vector<u8> bytes;
for (;;) {
u8 buffer[4096];
ssize_t nread = recv(m_socket->fd(), buffer, sizeof(buffer), MSG_DONTWAIT);
if (nread == 0 || (nread == -1 && errno == EAGAIN)) {
if (bytes.is_empty()) {
CEventLoop::current().post_event(*this, make<IDisconnectedEvent>(client_id()));
return;
}
break;
}
if (nread < 0) {
perror("recv");
ASSERT_NOT_REACHED();
}
bytes.append(buffer, nread);
}
size_t decoded_bytes = 0;
for (size_t index = 0; index < (size_t)bytes.size(); index += decoded_bytes) {
auto remaining_bytes = ByteBuffer::wrap(bytes.data() + index, bytes.size() - index);
auto message = Endpoint::decode_message(remaining_bytes, decoded_bytes);
if (!message) {
dbg() << "drain_messages_from_client: Endpoint didn't recognize message";
did_misbehave();
return;
}
if (auto response = m_endpoint.handle(*message))
post_message(*response);
ASSERT(decoded_bytes);
}
}
void did_misbehave()
{
dbg() << "Connection{" << this << "} (id=" << m_client_id << ", pid=" << m_client_pid << ") misbehaved, disconnecting.";
shutdown();
}
void did_misbehave(const char* message)
{
dbg() << "Connection{" << this << "} (id=" << m_client_id << ", pid=" << m_client_pid << ") misbehaved (" << message << "), disconnecting.";
shutdown();
}
void shutdown()
{
m_socket->close();
die();
}
int client_id() const { return m_client_id; }
pid_t client_pid() const { return m_client_pid; }
virtual void die() = 0;
protected:
void event(CEvent& event) override
{
if (event.type() == IEvent::Disconnected) {
int client_id = static_cast<const IDisconnectedEvent&>(event).client_id();
dbgprintf("Connection: Client disconnected: %d\n", client_id);
die();
return;
}
CObject::event(event);
}
private:
Endpoint& m_endpoint;
RefPtr<CLocalSocket> m_socket;
int m_client_id { -1 };
int m_client_pid { -1 };
};
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