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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "base/rand_util.h" | 5 #include "base/rand_util.h" |
6 | 6 |
7 #include <errno.h> | 7 #include <errno.h> |
8 #include <fcntl.h> | 8 #include <fcntl.h> |
9 #include <stddef.h> | 9 #include <stddef.h> |
10 #include <stdint.h> | 10 #include <stdint.h> |
11 #include <unistd.h> | 11 #include <unistd.h> |
12 | 12 |
13 #include "base/files/file_util.h" | 13 #include "base/files/file_util.h" |
14 #include "base/lazy_instance.h" | 14 #include "base/lazy_instance.h" |
15 #include "base/logging.h" | 15 #include "base/logging.h" |
16 #include "base/posix/eintr_wrapper.h" | 16 #include "base/posix/eintr_wrapper.h" |
17 | 17 |
18 namespace { | 18 namespace { |
19 | 19 |
20 // We keep the file descriptor for /dev/urandom around so we don't need to | 20 // We keep the file descriptor for /dev/urandom around so we don't need to |
21 // reopen it (which is expensive), and since we may not even be able to reopen | 21 // reopen it (which is expensive), and since we may not even be able to reopen |
22 // it if we are later put in a sandbox. This class wraps the file descriptor so | 22 // it if we are later put in a sandbox. This class wraps the file descriptor so |
23 // we can use LazyInstance to handle opening it on the first access. | 23 // we can use LazyInstance to handle opening it on the first access. |
24 class URandomFd { | 24 class URandomFd { |
25 public: | 25 public: |
| 26 #if defined(OS_AIX) |
| 27 // AIX has no 64-bit support for open falgs such as - |
| 28 // O_CLOEXEC, O_NOFOLLOW and O_TTY_INIT |
| 29 URandomFd() : fd_(HANDLE_EINTR(open("/dev/urandom", O_RDONLY))) { |
| 30 DCHECK_GE(fd_, 0) << "Cannot open /dev/urandom: " << errno; |
| 31 } |
| 32 #else |
26 URandomFd() : fd_(HANDLE_EINTR(open("/dev/urandom", O_RDONLY | O_CLOEXEC))) { | 33 URandomFd() : fd_(HANDLE_EINTR(open("/dev/urandom", O_RDONLY | O_CLOEXEC))) { |
27 DCHECK_GE(fd_, 0) << "Cannot open /dev/urandom: " << errno; | 34 DCHECK_GE(fd_, 0) << "Cannot open /dev/urandom: " << errno; |
28 } | 35 } |
| 36 #endif |
29 | 37 |
30 ~URandomFd() { close(fd_); } | 38 ~URandomFd() { close(fd_); } |
31 | 39 |
32 int fd() const { return fd_; } | 40 int fd() const { return fd_; } |
33 | 41 |
34 private: | 42 private: |
35 const int fd_; | 43 const int fd_; |
36 }; | 44 }; |
37 | 45 |
38 base::LazyInstance<URandomFd>::Leaky g_urandom_fd = LAZY_INSTANCE_INITIALIZER; | 46 base::LazyInstance<URandomFd>::Leaky g_urandom_fd = LAZY_INSTANCE_INITIALIZER; |
(...skipping 14 matching lines...) Expand all Loading... |
53 const bool success = | 61 const bool success = |
54 ReadFromFD(urandom_fd, static_cast<char*>(output), output_length); | 62 ReadFromFD(urandom_fd, static_cast<char*>(output), output_length); |
55 CHECK(success); | 63 CHECK(success); |
56 } | 64 } |
57 | 65 |
58 int GetUrandomFD(void) { | 66 int GetUrandomFD(void) { |
59 return g_urandom_fd.Pointer()->fd(); | 67 return g_urandom_fd.Pointer()->fd(); |
60 } | 68 } |
61 | 69 |
62 } // namespace base | 70 } // namespace base |
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