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// Copyright 2013 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.
#include "ipc/ipc_channel_factory.h"
#include "base/file_util.h"
#include "base/logging.h"
#include "ipc/unix_domain_socket_util.h"
namespace IPC {
ChannelFactory::ChannelFactory(const base::FilePath& path, Delegate* delegate)
: path_(path), delegate_(delegate), listen_fd_(-1) {
DCHECK(delegate_);
CreateSocket();
}
ChannelFactory::~ChannelFactory() {
Close();
}
bool ChannelFactory::CreateSocket() {
DCHECK(listen_fd_ < 0);
// Create the socket.
return CreateServerUnixDomainSocket(path_, &listen_fd_);
}
bool ChannelFactory::Listen() {
if (listen_fd_ < 0)
return false;
// Watch the fd for connections, and turn any connections into
// active sockets.
MessageLoopForIO::current()->WatchFileDescriptor(
listen_fd_,
true,
MessageLoopForIO::WATCH_READ,
&server_listen_connection_watcher_,
this);
return true;
}
// Called by libevent when we can read from the fd without blocking.
void ChannelFactory::OnFileCanReadWithoutBlocking(int fd) {
DCHECK(fd == listen_fd_);
int new_fd = -1;
if (!ServerAcceptConnection(listen_fd_, &new_fd)) {
Close();
delegate_->OnListenError();
return;
}
if (new_fd < 0) {
// The accept() failed, but not in such a way that the factory needs to be
// shut down.
return;
}
file_util::ScopedFD scoped_fd(&new_fd);
// Verify that the IPC channel peer is running as the same user.
if (!IsPeerAuthorized(new_fd))
return;
ChannelHandle handle("", base::FileDescriptor(*scoped_fd.release(), true));
delegate_->OnClientConnected(handle);
}
void ChannelFactory::OnFileCanWriteWithoutBlocking(int fd) {
NOTREACHED() << "Listen fd should never be writable.";
}
void ChannelFactory::Close() {
if (listen_fd_ < 0)
return;
if (HANDLE_EINTR(close(listen_fd_)) < 0)
PLOG(ERROR) << "close";
listen_fd_ = -1;
if (unlink(path_.value().c_str()) < 0)
PLOG(ERROR) << "unlink";
// Unregister libevent for the listening socket and close it.
server_listen_connection_watcher_.StopWatchingFileDescriptor();
}
} // namespace IPC
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