96 lines
3.0 KiB
C++
96 lines
3.0 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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// This file is copied from
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// https://github.com/ClickHouse/ClickHouse/blob/master/src/Common/Elf.h
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// and modified by Doris
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#pragma once
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#if defined(__ELF__) && !defined(__FreeBSD__)
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#include <elf.h>
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#include <link.h>
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#include <filesystem>
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#include <functional>
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#include <optional>
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#include <string>
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using ElfAddr = ElfW(Addr);
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using ElfEhdr = ElfW(Ehdr);
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using ElfOff = ElfW(Off);
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using ElfPhdr = ElfW(Phdr);
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using ElfShdr = ElfW(Shdr);
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using ElfNhdr = ElfW(Nhdr);
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using ElfSym = ElfW(Sym);
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namespace doris {
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/** Allow to navigate sections in ELF.
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*/
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class Elf final {
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public:
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struct Section {
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const ElfShdr& header;
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[[nodiscard]] const char* name() const;
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[[nodiscard]] const char* begin() const;
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[[nodiscard]] const char* end() const;
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[[nodiscard]] size_t size() const;
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Section(const ElfShdr& header_, const Elf& elf_);
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private:
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const Elf& elf;
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};
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explicit Elf(const std::string& path);
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~Elf();
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bool iterateSections(std::function<bool(const Section& section, size_t idx)>&& pred) const;
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std::optional<Section> findSection(
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std::function<bool(const Section& section, size_t idx)>&& pred) const;
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std::optional<Section> findSectionByName(const char* name) const;
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[[nodiscard]] const char* begin() const { return mapped; }
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[[nodiscard]] const char* end() const { return mapped + elf_size; }
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[[nodiscard]] size_t size() const { return elf_size; }
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/// Obtain build id from SHT_NOTE of section headers (fallback to PT_NOTES section of program headers).
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/// Return empty string if does not exist.
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/// The string is returned in binary. Note that "readelf -n ./clickhouse-server" prints it in hex.
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[[nodiscard]] std::string getBuildID() const;
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static std::string getBuildID(const char* nhdr_pos, size_t size);
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/// Hash of the binary for integrity checks.
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[[nodiscard]] std::string getStoredBinaryHash() const;
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private:
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int _fd = -1;
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std::filesystem::path _file;
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size_t elf_size;
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char* mapped = nullptr;
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const ElfEhdr* header = nullptr;
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const ElfShdr* section_headers = nullptr;
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const ElfPhdr* program_headers = nullptr;
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const char* section_names = nullptr;
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};
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} // namespace doris
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#endif
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