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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "ipc/ipc_channel_factory.h" | |
| 6 | |
| 7 #include "base/file_util.h" | |
| 8 #include "base/logging.h" | |
| 9 #include "ipc/unix_domain_socket_util.h" | |
| 10 | |
| 11 namespace IPC { | |
| 12 | |
| 13 ChannelFactory::ChannelFactory(const base::FilePath& path, Delegate* delegate) | |
| 14 : path_(path), delegate_(delegate), listen_fd_(-1) { | |
| 15 DCHECK(delegate_); | |
| 16 CreateSocket(); | |
| 17 } | |
| 18 | |
| 19 ChannelFactory::~ChannelFactory() { | |
| 20 Close(); | |
| 21 } | |
| 22 | |
| 23 bool ChannelFactory::CreateSocket() { | |
| 24 DCHECK(listen_fd_ < 0); | |
| 25 | |
| 26 // Create the socket. | |
| 27 return CreateServerUnixDomainSocket(path_, &listen_fd_); | |
| 28 } | |
| 29 | |
| 30 bool ChannelFactory::Listen() { | |
| 31 if (listen_fd_ < 0) | |
| 32 return false; | |
| 33 | |
| 34 // Watch the fd for connections, and turn any connections into | |
| 35 // active sockets. | |
| 36 MessageLoopForIO::current()->WatchFileDescriptor( | |
| 37 listen_fd_, | |
| 38 true, | |
| 39 MessageLoopForIO::WATCH_READ, | |
| 40 &server_listen_connection_watcher_, | |
| 41 this); | |
| 42 return true; | |
| 43 } | |
| 44 | |
| 45 // Called by libevent when we can read from the fd without blocking. | |
| 46 void ChannelFactory::OnFileCanReadWithoutBlocking(int fd) { | |
| 47 DCHECK(fd == listen_fd_); | |
| 48 int new_fd = -1; | |
| 49 if (!ServerAcceptConnection(listen_fd_, &new_fd)) { | |
| 50 Close(); | |
| 51 delegate_->OnListenError(); | |
| 52 return; | |
| 53 } | |
| 54 | |
| 55 if (new_fd < 0) { | |
| 56 // The accept() failed, but not in such a way that the factory needs to be | |
| 57 // shut down. | |
| 58 return; | |
| 59 } | |
| 60 | |
| 61 file_util::ScopedFD scoped_fd(&new_fd); | |
| 62 | |
| 63 // Verify that the IPC channel peer is running as the same user. | |
| 64 if (!IsPeerAuthorized(new_fd)) | |
| 65 return; | |
| 66 | |
| 67 ChannelHandle handle("", base::FileDescriptor(*scoped_fd.release(), true)); | |
| 68 delegate_->OnClientConnected(handle); | |
| 69 } | |
| 70 | |
| 71 void ChannelFactory::OnFileCanWriteWithoutBlocking(int fd) { | |
| 72 NOTREACHED() << "Listen fd should never be writable."; | |
| 73 } | |
| 74 | |
| 75 void ChannelFactory::Close() { | |
| 76 if (listen_fd_ < 0) | |
| 77 return; | |
| 78 if (HANDLE_EINTR(close(listen_fd_)) < 0) | |
| 79 PLOG(ERROR) << "close"; | |
| 80 listen_fd_ = -1; | |
| 81 if (unlink(path_.value().c_str()) < 0) | |
| 82 PLOG(ERROR) << "unlink"; | |
| 83 | |
| 84 // Unregister libevent for the listening socket and close it. | |
| 85 server_listen_connection_watcher_.StopWatchingFileDescriptor(); | |
| 86 } | |
| 87 | |
| 88 } // namespace IPC | |
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