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