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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/Library/DoubleBuffer.h>
#include <Kernel/Net/Socket.h>
namespace Kernel {
class OpenFileDescription;
struct SocketPair {
NonnullRefPtr<OpenFileDescription> description0;
NonnullRefPtr<OpenFileDescription> description1;
};
class LocalSocket final : public Socket {
public:
static ErrorOr<NonnullRefPtr<LocalSocket>> try_create(int type);
static ErrorOr<SocketPair> try_create_connected_pair(int type);
virtual ~LocalSocket() override;
ErrorOr<void> sendfd(OpenFileDescription const& socket_description, NonnullRefPtr<OpenFileDescription> passing_description);
ErrorOr<NonnullRefPtr<OpenFileDescription>> recvfd(OpenFileDescription const& socket_description);
ErrorOr<Vector<NonnullRefPtr<OpenFileDescription>>> recvfds(OpenFileDescription const& socket_description, int n);
static void for_each(Function<void(LocalSocket const&)>);
static ErrorOr<void> try_for_each(Function<ErrorOr<void>(LocalSocket const&)>);
StringView socket_path() const;
ErrorOr<NonnullOwnPtr<KString>> pseudo_path(OpenFileDescription const& description) const override;
// ^Socket
virtual ErrorOr<void> bind(Credentials const&, Userspace<sockaddr const*>, socklen_t) override;
virtual ErrorOr<void> connect(Credentials const&, OpenFileDescription&, Userspace<sockaddr const*>, socklen_t) override;
virtual ErrorOr<void> listen(size_t) override;
virtual void get_local_address(sockaddr*, socklen_t*) override;
virtual void get_peer_address(sockaddr*, socklen_t*) override;
virtual ErrorOr<void> attach(OpenFileDescription&) override;
virtual void detach(OpenFileDescription&) override;
virtual bool can_read(OpenFileDescription const&, u64) const override;
virtual bool can_write(OpenFileDescription const&, u64) const override;
virtual ErrorOr<size_t> sendto(OpenFileDescription&, UserOrKernelBuffer const&, size_t, int, Userspace<sockaddr const*>, socklen_t) override;
virtual ErrorOr<size_t> recvfrom(OpenFileDescription&, UserOrKernelBuffer&, size_t, int flags, Userspace<sockaddr*>, Userspace<socklen_t*>, UnixDateTime&, bool blocking) override;
virtual ErrorOr<void> getsockopt(OpenFileDescription&, int level, int option, Userspace<void*>, Userspace<socklen_t*>) override;
virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
virtual ErrorOr<void> chown(Credentials const&, OpenFileDescription&, UserID, GroupID) override;
virtual ErrorOr<void> chmod(Credentials const&, OpenFileDescription&, mode_t) override;
private:
explicit LocalSocket(int type, NonnullOwnPtr<DoubleBuffer> client_buffer, NonnullOwnPtr<DoubleBuffer> server_buffer);
virtual StringView class_name() const override { return "LocalSocket"sv; }
virtual bool is_local() const override { return true; }
bool has_attached_peer(OpenFileDescription const&) const;
DoubleBuffer* receive_buffer_for(OpenFileDescription&);
DoubleBuffer* send_buffer_for(OpenFileDescription&);
Vector<NonnullRefPtr<OpenFileDescription>>& sendfd_queue_for(OpenFileDescription const&);
Vector<NonnullRefPtr<OpenFileDescription>>& recvfd_queue_for(OpenFileDescription const&);
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();
}
ErrorOr<void> try_set_path(StringView);
// The inode this socket is bound to.
RefPtr<Inode> m_inode;
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 };
OpenFileDescription* m_connect_side_fd { nullptr };
virtual Role role(OpenFileDescription const& 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 };
OwnPtr<KString> m_path;
NonnullOwnPtr<DoubleBuffer> m_for_client;
NonnullOwnPtr<DoubleBuffer> m_for_server;
Vector<NonnullRefPtr<OpenFileDescription>> m_fds_for_client;
Vector<NonnullRefPtr<OpenFileDescription>> m_fds_for_server;
IntrusiveListNode<LocalSocket> m_list_node;
public:
using List = IntrusiveList<&LocalSocket::m_list_node>;
};
}
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