2023-01-28 04:54:20 +00:00
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// Copyright 2014 The Crashpad Authors
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2022-04-02 01:21:55 +00:00
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/mac/xattr.h"
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#include <errno.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/xattr.h>
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#include "base/logging.h"
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#include "base/numerics/safe_conversions.h"
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#include "base/strings/string_number_conversions.h"
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#include "base/strings/stringprintf.h"
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namespace crashpad {
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XattrStatus ReadXattr(const base::FilePath& file,
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const base::StringPiece& name,
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std::string* value) {
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// First get the size of the attribute value.
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ssize_t buffer_size = getxattr(file.value().c_str(), name.data(), nullptr,
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0, 0, 0);
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if (buffer_size < 0) {
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if (errno == ENOATTR)
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return XattrStatus::kNoAttribute;
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PLOG(ERROR) << "getxattr size " << name << " on file " << file.value();
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return XattrStatus::kOtherError;
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}
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// Resize the buffer and read into it.
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value->resize(buffer_size);
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if (!value->empty()) {
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ssize_t bytes_read = getxattr(file.value().c_str(), name.data(),
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&(*value)[0], value->size(),
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0, 0);
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if (bytes_read < 0) {
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PLOG(ERROR) << "getxattr " << name << " on file " << file.value();
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return XattrStatus::kOtherError;
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}
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DCHECK_EQ(bytes_read, buffer_size);
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}
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return XattrStatus::kOK;
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}
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bool WriteXattr(const base::FilePath& file,
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const base::StringPiece& name,
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const std::string& value) {
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int rv = setxattr(file.value().c_str(), name.data(), value.c_str(),
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value.length(), 0, 0);
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PLOG_IF(ERROR, rv != 0) << "setxattr " << name << " on file "
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<< file.value();
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return rv == 0;
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}
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XattrStatus ReadXattrBool(const base::FilePath& file,
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const base::StringPiece& name,
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bool* value) {
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std::string tmp;
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XattrStatus status;
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if ((status = ReadXattr(file, name, &tmp)) != XattrStatus::kOK)
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return status;
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if (tmp == "1") {
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*value = true;
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return XattrStatus::kOK;
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} else if (tmp == "0") {
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*value = false;
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return XattrStatus::kOK;
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} else {
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LOG(ERROR) << "ReadXattrBool " << name << " on file " << file.value()
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<< " could not be interpreted as boolean";
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return XattrStatus::kOtherError;
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}
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}
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bool WriteXattrBool(const base::FilePath& file,
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const base::StringPiece& name,
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bool value) {
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return WriteXattr(file, name, (value ? "1" : "0"));
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}
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XattrStatus ReadXattrInt(const base::FilePath& file,
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const base::StringPiece& name,
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int* value) {
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std::string tmp;
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XattrStatus status;
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if ((status = ReadXattr(file, name, &tmp)) != XattrStatus::kOK)
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return status;
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if (!base::StringToInt(tmp, value)) {
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LOG(ERROR) << "ReadXattrInt " << name << " on file " << file.value()
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<< " could not be converted to an int";
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return XattrStatus::kOtherError;
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}
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return XattrStatus::kOK;
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}
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bool WriteXattrInt(const base::FilePath& file,
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const base::StringPiece& name,
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int value) {
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std::string tmp = base::StringPrintf("%d", value);
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return WriteXattr(file, name, tmp);
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}
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XattrStatus ReadXattrTimeT(const base::FilePath& file,
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const base::StringPiece& name,
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time_t* value) {
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// time_t on macOS is defined as a long, but it will be read into an int64_t
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// here, since there is no string conversion method for long.
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std::string tmp;
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XattrStatus status;
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if ((status = ReadXattr(file, name, &tmp)) != XattrStatus::kOK)
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return status;
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int64_t encoded_value;
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if (!base::StringToInt64(tmp, &encoded_value)) {
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LOG(ERROR) << "ReadXattrTimeT " << name << " on file " << file.value()
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<< " could not be converted to an int";
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return XattrStatus::kOtherError;
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}
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*value = base::saturated_cast<time_t>(encoded_value);
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if (!base::IsValueInRangeForNumericType<time_t>(encoded_value)) {
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LOG(ERROR) << "ReadXattrTimeT " << name << " on file " << file.value()
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<< " read over-sized value and will saturate";
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return XattrStatus::kOtherError;
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}
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return XattrStatus::kOK;
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}
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bool WriteXattrTimeT(const base::FilePath& file,
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const base::StringPiece& name,
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time_t value) {
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std::string tmp = base::StringPrintf("%ld", value);
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return WriteXattr(file, name, tmp);
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}
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XattrStatus RemoveXattr(const base::FilePath& file,
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const base::StringPiece& name) {
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int rv = removexattr(file.value().c_str(), name.data(), 0);
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if (rv != 0) {
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if (errno == ENOATTR)
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return XattrStatus::kNoAttribute;
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PLOG(ERROR) << "removexattr " << name << " on file " << file.value();
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return XattrStatus::kOtherError;
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}
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return XattrStatus::kOK;
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}
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} // namespace crashpad
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