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#pragma once
#include <LibCore/CObject.h>
#include <LibCore/CEvent.h>
#include <LibCore/CEventLoop.h>
#include <LibCore/CIODevice.h>
#include <LibCore/CNotifier.h>
#include <errno.h>
#include <unistd.h>
#include <sys/uio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
class CIPCServerEvent : public CEvent {
public:
enum Type {
Invalid = 2000,
ClientDisconnected,
};
CIPCServerEvent() {}
explicit CIPCServerEvent(Type type)
: CEvent(type)
{
}
};
class ASClientDisconnectedNotification : public CIPCServerEvent {
public:
explicit ASClientDisconnectedNotification(int client_id)
: CIPCServerEvent(ClientDisconnected)
, m_client_id(client_id)
{
}
int client_id() const { return m_client_id; }
private:
int m_client_id { 0 };
};
template <typename T, class... Args>
T* CIPCServerSideClientCreator(Args&& ... args)
{
auto conn = new T(AK::forward<Args>(args)...) /* arghs */;
conn->send_greeting();
return conn;
};
template <typename ServerMessage, typename ClientMessage>
class CIPCServerSideClient : public CObject
{
public:
CIPCServerSideClient(int fd, int client_id)
: m_socket(fd)
, m_notifier(CNotifier(fd, CNotifier::Read))
, m_client_id(client_id)
{
m_notifier.on_ready_to_read = [this] { drain_client(); };
dbg() << "********** S: Created new CIPCServerSideClient " << fd << client_id << " and said hello";
}
~CIPCServerSideClient()
{
dbg() << "********** S: Destroyed CIPCServerSideClient " << m_socket.fd() << client_id();
}
void post_message(const ServerMessage& message, const ByteBuffer& extra_data = {})
{
if (!extra_data.is_empty())
const_cast<ServerMessage&>(message).extra_size = extra_data.size();
struct iovec iov[2];
int iov_count = 1;
iov[0].iov_base = const_cast<ServerMessage*>(&message);
iov[0].iov_len = sizeof(message);
if (!extra_data.is_empty()) {
iov[1].iov_base = const_cast<u8*>(extra_data.data());
iov[1].iov_len = extra_data.size();
++iov_count;
}
int nwritten = writev(m_socket.fd(), iov, iov_count);
if (nwritten < 0) {
switch (errno) {
case EPIPE:
dbgprintf("WSClientConnection::post_message: Disconnected from peer.\n");
delete_later();
return;
break;
case EAGAIN:
dbgprintf("WSClientConnection::post_message: Client buffer overflowed.\n");
did_misbehave();
return;
break;
default:
perror("WSClientConnection::post_message writev");
ASSERT_NOT_REACHED();
}
}
ASSERT(nwritten == (int)(sizeof(message) + extra_data.size()));
}
void drain_client()
{
unsigned messages_received = 0;
for (;;) {
ClientMessage message;
// FIXME: Don't go one message at a time, that's so much context switching, oof.
ssize_t nread = recv(m_socket.fd(), &message, sizeof(ClientMessage), MSG_DONTWAIT);
if (nread == 0 || (nread == -1 && errno == EAGAIN)) {
if (!messages_received) {
// TODO: is delete_later() sufficient?
CEventLoop::current().post_event(*this, make<ASClientDisconnectedNotification>(client_id()));
}
break;
}
if (nread < 0) {
perror("recv");
ASSERT_NOT_REACHED();
}
ByteBuffer extra_data;
if (message.extra_size) {
if (message.extra_size >= 32768) {
dbgprintf("message.extra_size is way too large\n");
return did_misbehave();
}
extra_data = ByteBuffer::create_uninitialized(message.extra_size);
// FIXME: We should allow this to time out. Maybe use a socket timeout?
int extra_nread = read(m_socket.fd(), extra_data.data(), extra_data.size());
if (extra_nread != (int)message.extra_size) {
dbgprintf("extra_nread(%d) != extra_size(%d)\n", extra_nread, extra_data.size());
if (extra_nread < 0)
perror("read");
return did_misbehave();
}
}
if (!handle_message(message, move(extra_data)))
return;
++messages_received;
}
}
void did_misbehave()
{
dbgprintf("CIPCServerSideClient{%p} (id=%d, pid=%d) misbehaved, disconnecting.\n", this, client_id(), m_pid);
delete_later();
m_notifier.set_enabled(false);
}
const char* class_name() const override { return "CIPCServerSideClient"; }
int client_id() const { return m_client_id; }
pid_t client_pid() const { return m_pid; }
void set_client_pid(pid_t pid) { m_pid = pid; }
// ### having this public is sad
virtual void send_greeting() = 0;
protected:
void event(CEvent& event)
{
if (event.type() == CIPCServerEvent::ClientDisconnected) {
int client_id = static_cast<const ASClientDisconnectedNotification&>(event).client_id();
dbgprintf("CIPCServerSideClient: Client disconnected: %d\n", client_id);
delete this;
return;
}
CObject::event(event);
}
virtual bool handle_message(const ClientMessage&, const ByteBuffer& = {}) = 0;
private:
// TODO: A way to create some kind of CIODevice with an open FD would be nice.
class COpenedSocket : public CIODevice
{
public:
const char* class_name() const override { return "COpenedSocket"; }
COpenedSocket(int fd)
{
set_fd(fd);
set_mode(CIODevice::OpenMode::ReadWrite);
}
bool open(CIODevice::OpenMode) override
{
ASSERT_NOT_REACHED();
return true;
};
int fd() const { return CIODevice::fd(); }
};
COpenedSocket m_socket;
CNotifier m_notifier;
int m_client_id;
int m_pid;
};
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