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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/IntrusiveList.h>
#include <Kernel/DoubleBuffer.h>
#include <Kernel/Net/Socket.h>
namespace Kernel {
class FileDescription;
struct SocketPair {
NonnullRefPtr<FileDescription> description0;
NonnullRefPtr<FileDescription> description1;
};
class LocalSocket final : public Socket {
public:
static KResultOr<NonnullRefPtr<LocalSocket>> try_create(int type);
static KResultOr<SocketPair> try_create_connected_pair(int type);
virtual ~LocalSocket() override;
KResult sendfd(const FileDescription& socket_description, FileDescription& passing_description);
KResultOr<NonnullRefPtr<FileDescription>> recvfd(const FileDescription& socket_description);
static void for_each(Function<void(const LocalSocket&)>);
StringView socket_path() const;
String absolute_path(const FileDescription& description) const override;
// ^Socket
virtual KResult bind(Userspace<const sockaddr*>, socklen_t) override;
virtual KResult connect(FileDescription&, Userspace<const sockaddr*>, socklen_t, ShouldBlock = ShouldBlock::Yes) override;
virtual KResult listen(size_t) override;
virtual void get_local_address(sockaddr*, socklen_t*) override;
virtual void get_peer_address(sockaddr*, socklen_t*) override;
virtual KResult attach(FileDescription&) override;
virtual void detach(FileDescription&) override;
virtual bool can_read(const FileDescription&, size_t) const override;
virtual bool can_write(const FileDescription&, size_t) const override;
virtual KResultOr<size_t> sendto(FileDescription&, const UserOrKernelBuffer&, size_t, int, Userspace<const sockaddr*>, socklen_t) override;
virtual KResultOr<size_t> recvfrom(FileDescription&, UserOrKernelBuffer&, size_t, int flags, Userspace<sockaddr*>, Userspace<socklen_t*>, Time&) override;
virtual KResult getsockopt(FileDescription&, int level, int option, Userspace<void*>, Userspace<socklen_t*>) override;
virtual KResult ioctl(FileDescription&, unsigned request, Userspace<void*> arg) override;
virtual KResult chown(FileDescription&, UserID, GroupID) override;
virtual KResult chmod(FileDescription&, mode_t) override;
private:
explicit LocalSocket(int type, NonnullOwnPtr<DoubleBuffer> client_buffer, NonnullOwnPtr<DoubleBuffer> server_buffer);
virtual StringView class_name() const override { return "LocalSocket"; }
virtual bool is_local() const override { return true; }
bool has_attached_peer(const FileDescription&) const;
DoubleBuffer* receive_buffer_for(FileDescription&);
DoubleBuffer* send_buffer_for(FileDescription&);
NonnullRefPtrVector<FileDescription>& sendfd_queue_for(const FileDescription&);
NonnullRefPtrVector<FileDescription>& recvfd_queue_for(const FileDescription&);
void set_connect_side_role(Role connect_side_role, bool force_evaluate_block_conditions = false)
{
auto previous = m_connect_side_role;
m_connect_side_role = connect_side_role;
if (previous != m_connect_side_role || force_evaluate_block_conditions)
evaluate_block_conditions();
}
// An open socket file on the filesystem.
RefPtr<FileDescription> m_file;
UserID m_prebind_uid { 0 };
GroupID m_prebind_gid { 0 };
mode_t m_prebind_mode { 0 };
// A single LocalSocket is shared between two file descriptions
// on the connect side and the accept side; so we need to store
// an additional role for the connect side and differentiate
// between them.
Role m_connect_side_role { Role::None };
FileDescription* m_connect_side_fd { nullptr };
virtual Role role(const FileDescription& description) const override
{
if (m_connect_side_fd == &description)
return m_connect_side_role;
return m_role;
}
bool m_bound { false };
bool m_accept_side_fd_open { false };
sockaddr_un m_address { 0, { 0 } };
NonnullOwnPtr<DoubleBuffer> m_for_client;
NonnullOwnPtr<DoubleBuffer> m_for_server;
NonnullRefPtrVector<FileDescription> m_fds_for_client;
NonnullRefPtrVector<FileDescription> m_fds_for_server;
IntrusiveListNode<LocalSocket> m_list_node;
public:
using List = IntrusiveList<LocalSocket, RawPtr<LocalSocket>, &LocalSocket::m_list_node>;
};
}
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