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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/files/scoped_file.h" | |
| 9 #include "base/logging.h" | |
| 10 #include "ipc/unix_domain_socket_util.h" | |
| 11 | |
| 12 namespace IPC { | |
| 13 | |
| 14 ChannelFactory::ChannelFactory(const base::FilePath& path, Delegate* delegate) | |
| 15 : path_(path), delegate_(delegate), listen_fd_(-1) { | |
| 16 DCHECK(delegate_); | |
| 17 CreateSocket(); | |
| 18 } | |
| 19 | |
| 20 ChannelFactory::~ChannelFactory() { | |
| 21 Close(); | |
| 22 } | |
| 23 | |
| 24 bool ChannelFactory::CreateSocket() { | |
| 25 DCHECK(listen_fd_ < 0); | |
| 26 | |
| 27 // Create the socket. | |
| 28 return CreateServerUnixDomainSocket(path_, &listen_fd_); | |
| 29 } | |
| 30 | |
| 31 bool ChannelFactory::Listen() { | |
| 32 if (listen_fd_ < 0) | |
| 33 return false; | |
| 34 | |
| 35 // Watch the fd for connections, and turn any connections into | |
| 36 // active sockets. | |
| 37 base::MessageLoopForIO::current()->WatchFileDescriptor( | |
| 38 listen_fd_, | |
| 39 true, | |
| 40 base::MessageLoopForIO::WATCH_READ, | |
| 41 &server_listen_connection_watcher_, | |
| 42 this); | |
| 43 return true; | |
| 44 } | |
| 45 | |
| 46 // Called by libevent when we can read from the fd without blocking. | |
| 47 void ChannelFactory::OnFileCanReadWithoutBlocking(int fd) { | |
| 48 DCHECK(fd == listen_fd_); | |
| 49 int new_fd = -1; | |
| 50 if (!ServerAcceptConnection(listen_fd_, &new_fd)) { | |
| 51 Close(); | |
| 52 delegate_->OnListenError(); | |
| 53 return; | |
| 54 } | |
| 55 base::ScopedFD scoped_fd(new_fd); | |
| 56 | |
| 57 if (!scoped_fd.is_valid()) { | |
| 58 // The accept() failed, but not in such a way that the factory needs to be | |
| 59 // shut down. | |
| 60 return; | |
| 61 } | |
| 62 | |
| 63 // Verify that the IPC channel peer is running as the same user. | |
| 64 if (!IsPeerAuthorized(scoped_fd.get())) | |
| 65 return; | |
| 66 | |
| 67 ChannelHandle handle(std::string(), | |
| 68 base::FileDescriptor(scoped_fd.release(), true)); | |
| 69 delegate_->OnClientConnected(handle); | |
| 70 } | |
| 71 | |
| 72 void ChannelFactory::OnFileCanWriteWithoutBlocking(int fd) { | |
| 73 NOTREACHED() << "Listen fd should never be writable."; | |
| 74 } | |
| 75 | |
| 76 void ChannelFactory::Close() { | |
| 77 if (listen_fd_ < 0) | |
| 78 return; | |
| 79 if (IGNORE_EINTR(close(listen_fd_)) < 0) | |
| 80 PLOG(ERROR) << "close"; | |
| 81 listen_fd_ = -1; | |
| 82 if (unlink(path_.value().c_str()) < 0) | |
| 83 PLOG(ERROR) << "unlink"; | |
| 84 | |
| 85 // Unregister libevent for the listening socket and close it. | |
| 86 server_listen_connection_watcher_.StopWatchingFileDescriptor(); | |
| 87 } | |
| 88 | |
| 89 } // namespace IPC | |
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