137 lines
5.6 KiB
C++
137 lines
5.6 KiB
C++
// Copyright 2017 The Crashpad Authors
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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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#ifndef CRASHPAD_UTIL_PROCESS_PROCESS_MEMORY_H_
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#define CRASHPAD_UTIL_PROCESS_PROCESS_MEMORY_H_
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#include <sys/types.h>
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#include <string>
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#include "build/build_config.h"
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#include "util/misc/address_types.h"
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#if BUILDFLAG(IS_WIN)
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#include <basetsd.h>
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typedef SSIZE_T ssize_t;
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#endif // BUILDFLAG(IS_WIN)
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namespace crashpad {
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//! \brief Abstract base class for accessing the memory of another process.
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//!
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//! Implementations are platform-specific.
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class ProcessMemory {
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public:
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//! \brief Copies memory from the target process into a caller-provided buffer
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//! in the current process.
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//!
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//! \param[in] address The address, in the target process' address space, of
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//! the memory region to copy.
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//! \param[in] size The size, in bytes, of the memory region to copy.
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//! \a buffer must be at least this size.
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//! \param[out] buffer The buffer into which the contents of the other
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//! process' memory will be copied.
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//!
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//! \return `true` on success, with \a buffer filled appropriately. `false` on
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//! failure, with a message logged.
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bool Read(VMAddress address, VMSize size, void* buffer) const;
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//! \brief Reads a `NUL`-terminated C string from the target process into a
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//! string in the current process.
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//!
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//! The length of the string need not be known ahead of time. This method will
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//! read contiguous memory until a `NUL` terminator is found.
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//!
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//! \param[in] address The address, in the target process’s address space, of
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//! the string to copy.
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//! \param[out] string The string read from the other process.
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//!
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//! \return `true` on success, with \a string set appropriately. `false` on
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//! failure, with a message logged. Failures can occur, for example, when
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//! encountering unmapped or unreadable pages.
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bool ReadCString(VMAddress address, std::string* string) const {
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return ReadCStringInternal(address, false, 0, string);
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}
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//! \brief Reads a `NUL`-terminated C string from the target process into a
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//! string in the current process.
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//!
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//! \param[in] address The address, in the target process’s address space, of
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//! the string to copy.
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//! \param[in] size The maximum number of bytes to read. The string is
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//! required to be `NUL`-terminated within this many bytes.
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//! \param[out] string The string read from the other process.
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//!
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//! \return `true` on success, with \a string set appropriately. `false` on
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//! failure, with a message logged. Failures can occur, for example, when
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//! a `NUL` terminator is not found within \a size bytes, or when
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//! encountering unmapped or unreadable pages.
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bool ReadCStringSizeLimited(VMAddress address,
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VMSize size,
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std::string* string) const {
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return ReadCStringInternal(address, true, size, string);
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}
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virtual ~ProcessMemory() = default;
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protected:
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ProcessMemory() = default;
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private:
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//! \brief Copies memory from the target process into a caller-provided buffer
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//! in the current process, up to a maximum number of bytes.
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//!
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//! \param[in] address The address, in the target process' address space, of
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//! the memory region to copy.
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//! \param[in] size The maximum size, in bytes, of the memory region to copy.
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//! \a buffer must be at least this size.
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//! \param[out] buffer The buffer into which the contents of the other
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//! process' memory will be copied.
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//!
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//! \return the number of bytes copied, 0 if there is no more data to read, or
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//! -1 on failure with a message logged.
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virtual ssize_t ReadUpTo(VMAddress address,
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size_t size,
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void* buffer) const = 0;
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//! \brief Reads a `NUL`-terminated C string from the target process into a
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//! string in the current process.
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//!
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//! \param[in] address The address, in the target process’s address space, of
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//! the string to copy.
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//! \param[in] has_size If true, this method will read \a size bytes. If
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//! false, this method will ignore \a size and instead read contiguous
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//! memory until a `NUL` terminator is found.
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//! \param[in] size If \a has_size is true, the maximum number of bytes to
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//! read. The string is required to be `NUL`-terminated within this many
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//! bytes. Ignored if \a has_size is false.
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//! \param[out] string The string read from the other process.
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//!
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//! \return `true` on success, with \a string set appropriately. `false` on
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//! failure, with a message logged. Failures can occur, for example, when
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//! encountering unmapped or unreadable pages.
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virtual bool ReadCStringInternal(VMAddress address,
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bool has_size,
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VMSize size,
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std::string* string) const;
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// Allow ProcessMemorySanitized to call ReadUpTo.
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friend class ProcessMemorySanitized;
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};
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_PROCESS_PROCESS_MEMORY_H_
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