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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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