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// Copyright (c) 2012 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_SOCKET_POSIX_H_
#define NET_SOCKET_UNIX_DOMAIN_SOCKET_POSIX_H_
#include <string>
#include "base/basictypes.h"
#include "base/callback_forward.h"
#include "base/compiler_specific.h"
#include "build/build_config.h"
#include "net/base/net_export.h"
#include "net/socket/stream_listen_socket.h"
#if defined(OS_ANDROID) || defined(OS_LINUX)
// Feature only supported on Linux currently. This lets the Unix Domain Socket
// not be backed by the file system.
#define SOCKET_ABSTRACT_NAMESPACE_SUPPORTED
#endif
namespace net {
// Unix Domain Socket Implementation. Supports abstract namespaces on Linux.
class NET_EXPORT UnixDomainSocket : public StreamListenSocket {
public:
virtual ~UnixDomainSocket();
// Callback that returns whether the already connected client, identified by
// its process |user_id| and |group_id|, is allowed to keep the connection
// open. Note that the socket is closed immediately in case the callback
// returns false.
typedef base::Callback<bool (uid_t user_id, gid_t group_id)> AuthCallback;
// Returns an authentication callback that always grants access for
// convenience in case you don't want to use authentication.
static AuthCallback NoAuthentication();
// Note that the returned UnixDomainSocket instance does not take ownership of
// |del|.
static scoped_ptr<UnixDomainSocket> CreateAndListen(
const std::string& path,
StreamListenSocket::Delegate* del,
const AuthCallback& auth_callback);
#if defined(SOCKET_ABSTRACT_NAMESPACE_SUPPORTED)
// Same as above except that the created socket uses the abstract namespace
// which is a Linux-only feature. If |fallback_path| is not empty,
// make the second attempt with the provided fallback name.
static scoped_ptr<UnixDomainSocket> CreateAndListenWithAbstractNamespace(
const std::string& path,
const std::string& fallback_path,
StreamListenSocket::Delegate* del,
const AuthCallback& auth_callback);
#endif
private:
UnixDomainSocket(SocketDescriptor s,
StreamListenSocket::Delegate* del,
const AuthCallback& auth_callback);
static scoped_ptr<UnixDomainSocket> CreateAndListenInternal(
const std::string& path,
const std::string& fallback_path,
StreamListenSocket::Delegate* del,
const AuthCallback& auth_callback,
bool use_abstract_namespace);
static SocketDescriptor CreateAndBind(const std::string& path,
bool use_abstract_namespace);
// StreamListenSocket:
virtual void Accept() OVERRIDE;
AuthCallback auth_callback_;
DISALLOW_COPY_AND_ASSIGN(UnixDomainSocket);
};
// Factory that can be used to instantiate UnixDomainSocket.
class NET_EXPORT UnixDomainSocketFactory : public StreamListenSocketFactory {
public:
// Note that this class does not take ownership of the provided delegate.
UnixDomainSocketFactory(const std::string& path,
const UnixDomainSocket::AuthCallback& auth_callback);
virtual ~UnixDomainSocketFactory();
// StreamListenSocketFactory:
virtual scoped_ptr<StreamListenSocket> CreateAndListen(
StreamListenSocket::Delegate* delegate) const OVERRIDE;
protected:
const std::string path_;
const UnixDomainSocket::AuthCallback auth_callback_;
private:
DISALLOW_COPY_AND_ASSIGN(UnixDomainSocketFactory);
};
#if defined(SOCKET_ABSTRACT_NAMESPACE_SUPPORTED)
// Use this factory to instantiate UnixDomainSocket using the abstract
// namespace feature (only supported on Linux).
class NET_EXPORT UnixDomainSocketWithAbstractNamespaceFactory
: public UnixDomainSocketFactory {
public:
UnixDomainSocketWithAbstractNamespaceFactory(
const std::string& path,
const std::string& fallback_path,
const UnixDomainSocket::AuthCallback& auth_callback);
virtual ~UnixDomainSocketWithAbstractNamespaceFactory();
// UnixDomainSocketFactory:
virtual scoped_ptr<StreamListenSocket> CreateAndListen(
StreamListenSocket::Delegate* delegate) const OVERRIDE;
private:
std::string fallback_path_;
DISALLOW_COPY_AND_ASSIGN(UnixDomainSocketWithAbstractNamespaceFactory);
};
#endif
} // namespace net
#endif // NET_SOCKET_UNIX_DOMAIN_SOCKET_POSIX_H_
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