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| 1 // Copyright (c) 2006-2008 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 "chrome/common/file_descriptor_posix.h" |
| 6 |
| 7 #include "base/logging.h" |
| 8 |
| 9 DescriptorSet::DescriptorSet() |
| 10 : next_descriptor_(0) { |
| 11 } |
| 12 |
| 13 DescriptorSet::~DescriptorSet() { |
| 14 if (next_descriptor_ == descriptors_.size()) |
| 15 return; |
| 16 |
| 17 LOG(WARNING) << "DescriptorSet destroyed with unconsumed descriptors"; |
| 18 // We close all the descriptors where the close flag is set. If this |
| 19 // message should have been transmitted, then closing those with close |
| 20 // flags set mirrors the expected behaviour. |
| 21 // |
| 22 // If this message was received with more descriptors than expected |
| 23 // (which could a DOS against the browser by a rouge renderer) then all |
| 24 // the descriptors have their close flag set and we free all the extra |
| 25 // kernel resources. |
| 26 for (unsigned i = next_descriptor_; i < descriptors_.size(); ++i) { |
| 27 if (descriptors_[i].auto_close) |
| 28 close(descriptors_[i].fd); |
| 29 } |
| 30 } |
| 31 |
| 32 void DescriptorSet::Add(int fd) { |
| 33 struct FileDescriptor sd; |
| 34 sd.fd = fd; |
| 35 sd.auto_close = false; |
| 36 descriptors_.push_back(sd); |
| 37 DCHECK(descriptors_.size() <= MAX_DESCRIPTORS_PER_MESSAGE); |
| 38 } |
| 39 |
| 40 void DescriptorSet::AddAndAutoClose(int fd) { |
| 41 struct FileDescriptor sd; |
| 42 sd.fd = fd; |
| 43 sd.auto_close = true; |
| 44 descriptors_.push_back(sd); |
| 45 DCHECK(descriptors_.size() <= MAX_DESCRIPTORS_PER_MESSAGE); |
| 46 } |
| 47 |
| 48 int DescriptorSet::NextDescriptor() { |
| 49 if (next_descriptor_ == descriptors_.size()) |
| 50 return -1; |
| 51 |
| 52 return descriptors_[next_descriptor_++].fd; |
| 53 } |
| 54 |
| 55 void DescriptorSet::GetDescriptors(int* buffer) const { |
| 56 for (std::vector<FileDescriptor>::const_iterator |
| 57 i = descriptors_.begin(); i != descriptors_.end(); ++i) { |
| 58 *(buffer++) = i->fd; |
| 59 } |
| 60 } |
| 61 |
| 62 void DescriptorSet::CommitAll() { |
| 63 for (std::vector<FileDescriptor>::iterator |
| 64 i = descriptors_.begin(); i != descriptors_.end(); ++i) { |
| 65 if (i->auto_close) |
| 66 close(i->fd); |
| 67 } |
| 68 descriptors_.clear(); |
| 69 } |
| 70 |
| 71 void DescriptorSet::SetDescriptors(const int* buffer, unsigned count) { |
| 72 DCHECK(count <= MAX_DESCRIPTORS_PER_MESSAGE); |
| 73 DCHECK(descriptors_.size() == 0); |
| 74 |
| 75 descriptors_.reserve(count); |
| 76 for (unsigned i = 0; i < count; ++i) { |
| 77 struct FileDescriptor sd; |
| 78 sd.fd = buffer[i]; |
| 79 sd.auto_close = true; |
| 80 descriptors_.push_back(sd); |
| 81 } |
| 82 } |
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