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| 1 // Copyright (c) 2011 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 #ifndef BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_ | |
| 6 #define BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_ | |
| 7 | |
| 8 #include <stdint.h> | |
| 9 #include <sys/types.h> | |
| 10 #include <vector> | |
| 11 | |
| 12 #include "base/base_export.h" | |
| 13 #include "base/files/scoped_file.h" | |
| 14 #include "base/memory/scoped_vector.h" | |
| 15 #include "base/process/process_handle.h" | |
| 16 | |
| 17 namespace base { | |
| 18 | |
| 19 class Pickle; | |
| 20 | |
| 21 class BASE_EXPORT UnixDomainSocket { | |
| 22 public: | |
| 23 // Maximum number of file descriptors that can be read by RecvMsg(). | |
| 24 static const size_t kMaxFileDescriptors; | |
| 25 | |
| 26 #if !defined(OS_NACL_NONSFI) | |
| 27 // Use to enable receiving process IDs in RecvMsgWithPid. Should be called on | |
| 28 // the receiving socket (i.e., the socket passed to RecvMsgWithPid). Returns | |
| 29 // true if successful. | |
| 30 static bool EnableReceiveProcessId(int fd); | |
| 31 #endif // !defined(OS_NACL_NONSFI) | |
| 32 | |
| 33 // Use sendmsg to write the given msg and include a vector of file | |
| 34 // descriptors. Returns true if successful. | |
| 35 static bool SendMsg(int fd, | |
| 36 const void* msg, | |
| 37 size_t length, | |
| 38 const std::vector<int>& fds); | |
| 39 | |
| 40 // Use recvmsg to read a message and an array of file descriptors. Returns | |
| 41 // -1 on failure. Note: will read, at most, |kMaxFileDescriptors| descriptors. | |
| 42 static ssize_t RecvMsg(int fd, | |
| 43 void* msg, | |
| 44 size_t length, | |
| 45 ScopedVector<ScopedFD>* fds); | |
| 46 | |
| 47 // Same as RecvMsg above, but also returns the sender's process ID (as seen | |
| 48 // from the caller's namespace). However, before using this function to | |
| 49 // receive process IDs, EnableReceiveProcessId() should be called on the | |
| 50 // receiving socket. | |
| 51 static ssize_t RecvMsgWithPid(int fd, | |
| 52 void* msg, | |
| 53 size_t length, | |
| 54 ScopedVector<ScopedFD>* fds, | |
| 55 ProcessId* pid); | |
| 56 | |
| 57 #if !defined(OS_NACL_NONSFI) | |
| 58 // Perform a sendmsg/recvmsg pair. | |
| 59 // 1. This process creates a UNIX SEQPACKET socketpair. Using | |
| 60 // connection-oriented sockets (SEQPACKET or STREAM) is critical here, | |
| 61 // because if one of the ends closes the other one must be notified. | |
| 62 // 2. This process writes a request to |fd| with an SCM_RIGHTS control | |
| 63 // message containing on end of the fresh socket pair. | |
| 64 // 3. This process blocks reading from the other end of the fresh | |
| 65 // socketpair. | |
| 66 // 4. The target process receives the request, processes it and writes the | |
| 67 // reply to the end of the socketpair contained in the request. | |
| 68 // 5. This process wakes up and continues. | |
| 69 // | |
| 70 // fd: descriptor to send the request on | |
| 71 // reply: buffer for the reply | |
| 72 // reply_len: size of |reply| | |
| 73 // result_fd: (may be NULL) the file descriptor returned in the reply | |
| 74 // (if any) | |
| 75 // request: the bytes to send in the request | |
| 76 static ssize_t SendRecvMsg(int fd, | |
| 77 uint8_t* reply, | |
| 78 unsigned reply_len, | |
| 79 int* result_fd, | |
| 80 const Pickle& request); | |
| 81 | |
| 82 // Similar to SendRecvMsg(), but |recvmsg_flags| allows to control the flags | |
| 83 // of the recvmsg(2) call. | |
| 84 static ssize_t SendRecvMsgWithFlags(int fd, | |
| 85 uint8_t* reply, | |
| 86 unsigned reply_len, | |
| 87 int recvmsg_flags, | |
| 88 int* result_fd, | |
| 89 const Pickle& request); | |
| 90 #endif // !defined(OS_NACL_NONSFI) | |
| 91 private: | |
| 92 // Similar to RecvMsg, but allows to specify |flags| for recvmsg(2). | |
| 93 static ssize_t RecvMsgWithFlags(int fd, | |
| 94 void* msg, | |
| 95 size_t length, | |
| 96 int flags, | |
| 97 ScopedVector<ScopedFD>* fds, | |
| 98 ProcessId* pid); | |
| 99 }; | |
| 100 | |
| 101 } // namespace base | |
| 102 | |
| 103 #endif // BASE_POSIX_UNIX_DOMAIN_SOCKET_LINUX_H_ | |
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