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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_SOCKET_UNIX_DOMAIN_SERVER_SOCKET_POSIX_H_
#define NET_SOCKET_UNIX_DOMAIN_SERVER_SOCKET_POSIX_H_
#include <stdint.h>
#include <sys/types.h>
#include <memory>
#include <string>
#include "base/callback.h"
#include "build/build_config.h"
#include "net/base/completion_once_callback.h"
#include "net/base/net_export.h"
#include "net/socket/server_socket.h"
#include "net/socket/socket_descriptor.h"
namespace net {
class SocketPosix;
// A server socket that uses unix domain socket as the transport layer.
// Supports abstract namespaces on Linux and Android.
class NET_EXPORT UnixDomainServerSocket : public ServerSocket {
public:
// Credentials of a peer process connected to the socket.
struct NET_EXPORT Credentials {
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_ANDROID) || \
BUILDFLAG(IS_FUCHSIA)
// Linux and Fuchsia provide more information about the connected peer
// than Windows/OS X. It's useful for permission-based authorization on
// Android.
pid_t process_id;
#endif
uid_t user_id;
gid_t group_id;
};
// Callback that returns whether the already connected client, identified by
// its credentials, is allowed to keep the connection open. Note that
// the socket is closed immediately in case the callback returns false.
using AuthCallback = base::RepeatingCallback<bool(const Credentials&)>;
UnixDomainServerSocket(const AuthCallback& auth_callack,
bool use_abstract_namespace);
UnixDomainServerSocket(const UnixDomainServerSocket&) = delete;
UnixDomainServerSocket& operator=(const UnixDomainServerSocket&) = delete;
~UnixDomainServerSocket() override;
// Gets credentials of peer to check permissions.
static bool GetPeerCredentials(SocketDescriptor socket_fd,
Credentials* credentials);
// ServerSocket implementation.
int Listen(const IPEndPoint& address, int backlog) override;
int ListenWithAddressAndPort(const std::string& address_string,
uint16_t port,
int backlog) override;
int GetLocalAddress(IPEndPoint* address) const override;
int Accept(std::unique_ptr<StreamSocket>* socket,
CompletionOnceCallback callback) override;
// Creates a server socket, binds it to the specified |socket_path| and
// starts listening for incoming connections with the specified |backlog|.
int BindAndListen(const std::string& socket_path, int backlog);
// Accepts an incoming connection on |listen_socket_|, but passes back
// a raw SocketDescriptor instead of a StreamSocket.
int AcceptSocketDescriptor(SocketDescriptor* socket_descriptor,
CompletionOnceCallback callback);
private:
int DoAccept();
void AcceptCompleted(int rv);
bool AuthenticateAndGetStreamSocket();
void SetSocketResult(std::unique_ptr<SocketPosix> accepted_socket);
void RunCallback(int rv);
void CancelCallback();
std::unique_ptr<SocketPosix> listen_socket_;
const AuthCallback auth_callback_;
CompletionOnceCallback callback_;
const bool use_abstract_namespace_;
std::unique_ptr<SocketPosix> accept_socket_;
struct SocketDestination {
// Non-null while a call to Accept is pending.
std::unique_ptr<StreamSocket>* stream = nullptr;
// Non-null while a call to AcceptSocketDescriptor is pending.
SocketDescriptor* descriptor = nullptr;
};
SocketDestination out_socket_;
};
} // namespace net
#endif // NET_SOCKET_UNIX_DOMAIN_SERVER_SOCKET_POSIX_H_
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