├── .github └── workflows │ ├── test_linux.yml │ └── test_macos.yml ├── .gitignore ├── .swiftpm └── xcode │ └── package.xcworkspace │ └── contents.xcworkspacedata ├── LICENSE.md ├── Package.swift ├── README.md ├── Sources ├── Clibelf │ └── module.modulemap └── SwiftELF │ ├── RuntimeError.swift │ ├── SwiftELF+Header.swift │ ├── SwiftELF+Kind.swift │ ├── SwiftELF+Section.swift │ ├── SwiftELF+SymbolTable.swift │ └── SwiftELF.swift └── Tests ├── Files ├── elf-FreeBSD-x86_64-echo ├── elf-Linux-lib-x64.so ├── elf-Linux-x64-bash └── testfile-phdrs.elf ├── LinuxMain.swift └── SwiftELFTests ├── SwiftELFTests.swift ├── TestFiles.swift └── XCTestManifests.swift /.github/workflows/test_linux.yml: -------------------------------------------------------------------------------- 1 | name: Run tests on Linux 2 | on: 3 | push: 4 | branches: 5 | - main 6 | jobs: 7 | test: 8 | name: Test on Linux 9 | runs-on: ubuntu-latest 10 | steps: 11 | - name: Checkout 12 | uses: actions/checkout@v1 13 | - name: Install libelf 14 | run: sudo apt install libelf-dev 15 | - name: Run tests 16 | run: swift test 17 | -------------------------------------------------------------------------------- /.github/workflows/test_macos.yml: -------------------------------------------------------------------------------- 1 | name: Run tests on macOS 2 | on: 3 | push: 4 | branches: 5 | - main 6 | jobs: 7 | test: 8 | name: Test on macOS 9 | runs-on: macos-latest 10 | steps: 11 | - name: Checkout 12 | uses: actions/checkout@v1 13 | - name: Install libelf 14 | run: brew install libelf 15 | - name: Run tests 16 | run: swift test 17 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | /.build 3 | /Packages 4 | /*.xcodeproj 5 | xcuserdata/ 6 | -------------------------------------------------------------------------------- /.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2020 Marcus Kida 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /Package.swift: -------------------------------------------------------------------------------- 1 | // swift-tools-version:5.2 2 | // The swift-tools-version declares the minimum version of Swift required to build this package. 3 | 4 | import PackageDescription 5 | 6 | let package = Package( 7 | name: "SwiftELF", 8 | products: [ 9 | // Products define the executables and libraries a package produces, and make them visible to other packages. 10 | .library( 11 | name: "SwiftELF", 12 | targets: ["SwiftELF"]), 13 | ], 14 | dependencies: [ 15 | // Dependencies declare other packages that this package depends on. 16 | // .package(url: /* package url */, from: "1.0.0"), 17 | ], 18 | targets: [ 19 | // Targets are the basic building blocks of a package. A target can define a module or a test suite. 20 | // Targets can depend on other targets in this package, and on products in packages this package depends on. 21 | .target( 22 | name: "SwiftELF", 23 | dependencies: ["Clibelf"]), 24 | .testTarget( 25 | name: "SwiftELFTests", 26 | dependencies: ["SwiftELF"]), 27 | .systemLibrary( 28 | name: "Clibelf", 29 | pkgConfig: "libelf", 30 | providers: [ 31 | .brew(["libelf"]), 32 | .apt(["libelf-dev"]) 33 | ] 34 | ), 35 | ] 36 | ) 37 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # SwiftELF 2 | 3 | A Swift Wrapper for libelf. 4 | 5 | ![Run tests on macOS](https://github.com/EmbeddedSwift/SwiftELF/workflows/Run%20tests%20on%20macOS/badge.svg) ![Run tests on Linux](https://github.com/EmbeddedSwift/SwiftELF/workflows/Run%20tests%20on%20Linux/badge.svg) 6 | 7 | This wrapper shall be compatible with macOS and Linux and will use the installed `libelf` which you can install using the package manager of your choice. 8 | 9 | For macOS, you can easily install `libelf` using Homebrew: 10 | 11 | ``` 12 | $ brew install libelf 13 | ``` 14 | -------------------------------------------------------------------------------- /Sources/Clibelf/module.modulemap: -------------------------------------------------------------------------------- 1 | module ClibelfMac { 2 | header "/usr/local/include/libelf/libelf.h" 3 | header "/usr/local/include/libelf/gelf.h" 4 | link "elf" 5 | export * 6 | } 7 | 8 | module ClibelfLinux { 9 | header "/usr/include/libelf.h" 10 | header "/usr/include/gelf.h" 11 | link "elf" 12 | export * 13 | } 14 | -------------------------------------------------------------------------------- /Sources/SwiftELF/RuntimeError.swift: -------------------------------------------------------------------------------- 1 | public enum RuntimeError: Error { 2 | case fileNotFound 3 | case invalidVersion 4 | case initialization 5 | case invalidKind 6 | case couldNotGetHeader 7 | case couldNotGetClass 8 | case couldNotGetIdent 9 | case couldNotFetchStringTableSectionIndex 10 | case undefined 11 | } 12 | -------------------------------------------------------------------------------- /Sources/SwiftELF/SwiftELF+Header.swift: -------------------------------------------------------------------------------- 1 | #if canImport(Darwin) 2 | import Darwin 3 | import ClibelfMac 4 | #else 5 | import Glibc 6 | import ClibelfLinux 7 | #endif 8 | 9 | public extension SwiftELF { 10 | func printHeader() throws { 11 | guard let kind = kind, case Kind.elf = kind else { 12 | throw RuntimeError.invalidKind 13 | } 14 | 15 | let ehdr = UnsafeMutablePointer.allocate(capacity: 1) 16 | guard gelf_getehdr(elf, ehdr) != nil else { 17 | throw RuntimeError.couldNotGetHeader 18 | } 19 | 20 | let cls = gelf_getclass(elf) 21 | guard cls != ELFCLASSNONE else { 22 | throw RuntimeError.couldNotGetClass 23 | } 24 | 25 | guard let _ = elf_getident(elf, nil) else { 26 | throw RuntimeError.couldNotGetIdent 27 | } 28 | 29 | // todo: this method should actually return the header in a 30 | // useful format. 31 | 32 | print("-- ELF Header Begin ---") 33 | print("e_ident", ehdr.pointee.e_ident) 34 | print("e_type", ehdr.pointee.e_type) 35 | print("e_machine", ehdr.pointee.e_machine) 36 | print("e_version", ehdr.pointee.e_version) 37 | print("e_entry", ehdr.pointee.e_entry) 38 | print("e_phoff", ehdr.pointee.e_phoff) 39 | print("e_shoff", ehdr.pointee.e_shoff) 40 | print("e_flags", ehdr.pointee.e_flags) 41 | print("e_ehsize", ehdr.pointee.e_ehsize) 42 | print("e_phentsize", ehdr.pointee.e_phentsize) 43 | print("e_shentsize", ehdr.pointee.e_shentsize) 44 | print("-- ELF Header End ---") 45 | } 46 | } 47 | -------------------------------------------------------------------------------- /Sources/SwiftELF/SwiftELF+Kind.swift: -------------------------------------------------------------------------------- 1 | #if canImport(Darwin) 2 | import Darwin 3 | import ClibelfMac 4 | #else 5 | import Glibc 6 | import ClibelfLinux 7 | #endif 8 | 9 | public extension SwiftELF { 10 | var kind: Kind? { 11 | let kind = elf_kind(elf) 12 | if kind == ELF_K_NONE { 13 | return Kind.none 14 | } else if kind == ELF_K_AR { 15 | return .ar 16 | } else if kind == ELF_K_COFF { 17 | return .coff 18 | } else if kind == ELF_K_ELF { 19 | return .elf 20 | } else if kind == ELF_K_NUM { 21 | return .num 22 | } 23 | return nil 24 | } 25 | } 26 | -------------------------------------------------------------------------------- /Sources/SwiftELF/SwiftELF+Section.swift: -------------------------------------------------------------------------------- 1 | #if canImport(Darwin) 2 | import Darwin 3 | import ClibelfMac 4 | #else 5 | import Glibc 6 | import ClibelfLinux 7 | #endif 8 | 9 | public extension SwiftELF { 10 | func getSectionNames() throws -> [String: Int] { 11 | guard elf_kind(elf) == ELF_K_ELF else { 12 | throw RuntimeError.invalidKind 13 | } 14 | 15 | let shstrndx = UnsafeMutablePointer.allocate(capacity: 1) 16 | 17 | guard elf_getshdrstrndx(elf, shstrndx) == 0 else { 18 | throw RuntimeError.couldNotFetchStringTableSectionIndex 19 | } 20 | 21 | var sectionsNames = [String: Int]() 22 | var scn: OpaquePointer? = nil 23 | let shdr = UnsafeMutablePointer.allocate(capacity: 1) 24 | repeat { 25 | scn = elf_nextscn(elf, scn) 26 | 27 | if gelf_getshdr(scn, shdr) != shdr { 28 | throw RuntimeError.undefined // todo: add proper error 29 | } 30 | 31 | guard let name = elf_strptr(elf, shstrndx.pointee, Int(shdr.pointee.sh_name)) else { 32 | throw RuntimeError.undefined 33 | } 34 | 35 | sectionsNames[String(cString: name)] = elf_ndxscn(scn) 36 | 37 | } while elf_nextscn(elf, scn) != nil 38 | 39 | scn = elf_getscn(elf, shstrndx.pointee) 40 | 41 | guard scn != nil else { 42 | throw RuntimeError.undefined 43 | } 44 | 45 | guard gelf_getshdr(scn, shdr) == shdr else { 46 | throw RuntimeError.undefined 47 | } 48 | 49 | return sectionsNames 50 | } 51 | } 52 | -------------------------------------------------------------------------------- /Sources/SwiftELF/SwiftELF+SymbolTable.swift: -------------------------------------------------------------------------------- 1 | #if canImport(Darwin) 2 | import Darwin 3 | import ClibelfMac 4 | #else 5 | import Glibc 6 | import ClibelfLinux 7 | #endif 8 | 9 | public extension SwiftELF { 10 | enum SymbolTableType { 11 | case symtab, dynsym, unknown 12 | } 13 | 14 | typealias SymbolTable = [String: Int] 15 | 16 | func getSymbolTables() throws -> [SymbolTableType: SymbolTable] { 17 | var symbols = [SymbolTableType: SymbolTable]() 18 | 19 | let ehdr = UnsafeMutablePointer.allocate(capacity: 1) 20 | guard gelf_getehdr(elf, ehdr) != nil else { 21 | throw RuntimeError.couldNotGetHeader 22 | } 23 | 24 | var scn: OpaquePointer? = nil 25 | let shdr = UnsafeMutablePointer.allocate(capacity: 1) 26 | var data = UnsafeMutablePointer.allocate(capacity: 1) 27 | var count: Int = 0 28 | 29 | repeat { 30 | scn = elf_nextscn(elf, scn) 31 | gelf_getshdr(scn, shdr) 32 | 33 | if shdr.pointee.sh_type == SHT_SYMTAB || shdr.pointee.sh_type == SHT_DYNSYM { 34 | data = elf_getdata(scn, nil) 35 | count = Int(shdr.pointee.sh_size / shdr.pointee.sh_entsize) 36 | 37 | symbols[{ 38 | switch Int32(shdr.pointee.sh_type) { 39 | case SHT_SYMTAB: 40 | return .symtab 41 | case SHT_DYNSYM: 42 | return .dynsym 43 | default: 44 | return .unknown // this should never happen 45 | } 46 | }()] = { 47 | var values = SymbolTable() 48 | for i in 0 ..< count { 49 | var sym = UnsafeMutablePointer.allocate(capacity: 1) 50 | sym = gelf_getsym(data, Int32(i), sym) 51 | values[String(cString: elf_strptr(elf, Int(shdr.pointee.sh_link), Int(sym.pointee.st_name)))] = Int(sym.pointee.st_value.description) 52 | } 53 | return values 54 | }() 55 | } 56 | 57 | } while elf_nextscn(elf, scn) != nil 58 | 59 | return symbols 60 | } 61 | } 62 | -------------------------------------------------------------------------------- /Sources/SwiftELF/SwiftELF.swift: -------------------------------------------------------------------------------- 1 | #if canImport(Darwin) 2 | import Darwin 3 | import ClibelfMac 4 | #else 5 | import Glibc 6 | import ClibelfLinux 7 | #endif 8 | 9 | public enum Kind { 10 | case none, ar, coff, elf, num 11 | } 12 | 13 | public class SwiftELF { 14 | internal let elf: OpaquePointer 15 | internal let fd: Int32 16 | 17 | public init(at path: String) throws { 18 | fd = open(path, O_RDONLY) 19 | guard fd >= 0 else { 20 | throw RuntimeError.fileNotFound 21 | } 22 | guard elf_version(UInt32(EV_CURRENT)) != EV_NONE else { 23 | throw RuntimeError.invalidVersion 24 | } 25 | guard let elf = elf_begin(fd, ELF_C_READ, nil) else { 26 | throw RuntimeError.initialization 27 | } 28 | self.elf = elf 29 | } 30 | 31 | private func end() { 32 | elf_end(elf) 33 | close(fd) 34 | } 35 | 36 | deinit { 37 | end() 38 | } 39 | } 40 | -------------------------------------------------------------------------------- /Tests/Files/elf-FreeBSD-x86_64-echo: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/EmbeddedSwift/SwiftELF/c0fe366631e487a3b712f04100d00e6f0c3dc723/Tests/Files/elf-FreeBSD-x86_64-echo -------------------------------------------------------------------------------- /Tests/Files/elf-Linux-lib-x64.so: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/EmbeddedSwift/SwiftELF/c0fe366631e487a3b712f04100d00e6f0c3dc723/Tests/Files/elf-Linux-lib-x64.so -------------------------------------------------------------------------------- /Tests/Files/elf-Linux-x64-bash: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/EmbeddedSwift/SwiftELF/c0fe366631e487a3b712f04100d00e6f0c3dc723/Tests/Files/elf-Linux-x64-bash -------------------------------------------------------------------------------- /Tests/Files/testfile-phdrs.elf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/EmbeddedSwift/SwiftELF/c0fe366631e487a3b712f04100d00e6f0c3dc723/Tests/Files/testfile-phdrs.elf -------------------------------------------------------------------------------- /Tests/LinuxMain.swift: -------------------------------------------------------------------------------- 1 | import XCTest 2 | 3 | import SwiftELFTests 4 | 5 | var tests = [XCTestCaseEntry]() 6 | tests += SwiftELFTests.allTests() 7 | XCTMain(tests) 8 | -------------------------------------------------------------------------------- /Tests/SwiftELFTests/SwiftELFTests.swift: -------------------------------------------------------------------------------- 1 | import XCTest 2 | @testable import SwiftELF 3 | 4 | final class SwiftELFTests: XCTestCase { 5 | 6 | var sut: SwiftELF! 7 | 8 | override func setUp() { 9 | super.setUp() 10 | XCTAssertNoThrow(sut = try SwiftELF(at: TestFiles.elfLinuxLibX86.path)) 11 | } 12 | 13 | override func tearDown() { 14 | sut = nil 15 | super.tearDown() 16 | } 17 | 18 | func test_loads_elf() { 19 | XCTAssertNotNil(sut) 20 | } 21 | 22 | func test_gets_kind() { 23 | XCTAssertEqual(sut.kind, Kind.elf) 24 | } 25 | 26 | func test_prints_header() { 27 | XCTAssertNoThrow(try sut.printHeader()) 28 | } 29 | 30 | func test_gets_sectionNames() { 31 | let sectionNames = try! sut.getSectionNames() 32 | XCTAssertEqual(sectionNames, TestFiles.elfLinuxLibX86.sectionData) 33 | } 34 | 35 | func test_get_symbolTable() { 36 | let symbolTables = try! sut.getSymbolTables() 37 | XCTAssertEqual(symbolTables, TestFiles.elfLinuxLibX86.symbolTables) 38 | } 39 | 40 | static var allTests = [ 41 | ("test_loads_elf", test_loads_elf), 42 | ("test_gets_kind", test_gets_kind), 43 | ("test_prints_header", test_prints_header), 44 | ] 45 | } 46 | -------------------------------------------------------------------------------- /Tests/SwiftELFTests/TestFiles.swift: -------------------------------------------------------------------------------- 1 | import Foundation 2 | import SwiftELF 3 | 4 | enum TestFiles { 5 | case elfLinuxLibX86 6 | case testfilePhdrsElf 7 | case elfLinuxX64Bash 8 | 9 | var path: String { 10 | switch self { 11 | case .elfLinuxLibX86: 12 | return basePath.appendingPathComponent("elf-Linux-lib-x64.so").path 13 | case .testfilePhdrsElf: 14 | return basePath.appendingPathComponent("testfile-phdrs.elf").path 15 | case .elfLinuxX64Bash: 16 | return basePath.appendingPathComponent("elf-Linux-x64-bash").path 17 | } 18 | } 19 | 20 | var sectionData: [String: Int]? { 21 | switch self { 22 | case .elfLinuxLibX86: 23 | return [".data": 23, ".hash": 1, ".gnu.version_r": 6, ".fini_array": 17, ".init": 9, ".plt": 10, ".shstrtab": 25, ".gnu.hash": 2, ".rela.dyn": 7, ".fini": 12, ".eh_frame_hdr": 14, ".data.rel.ro": 19, ".eh_frame": 15, ".got.plt": 22, ".rela.plt": 8, ".dynstr": 4, ".got": 21, ".dynsym": 3, ".gnu.version": 5, ".init_array": 16, ".dynamic": 20, ".jcr": 18, ".text": 11, ".bss": 24, ".rodata": 13] 24 | case .testfilePhdrsElf: 25 | return [:] 26 | case .elfLinuxX64Bash: 27 | return [:] 28 | } 29 | } 30 | 31 | var symbolTables: [SwiftELF.SymbolTableType: SwiftELF.SymbolTable] { 32 | switch self { 33 | case .elfLinuxLibX86: 34 | return [.dynsym: ["FT_Get_Next_Char": 0, "XDestroyWindow": 0, "XSetClipRectangles": 0, "glReadPixels": 0, "cairo_mesh_pattern_get_patch_count": 350384, "XRenderFreeGlyphs": 0, "sincos": 0, "cairo_pattern_set_matrix": 334032, "puts": 0, "__printf_chk": 0, "ldiv": 0, "FT_Get_Glyph_Name": 0, "cairo_xcb_surface_create_for_bitmap": 668640, "cairo_show_page": 144624, "cairo_mesh_pattern_set_corner_color_rgba": 332400, "cairo_recording_surface_ink_extents": 389632, "png_get_valid": 0, "_XReadEvents": 0, "pthread_mutexattr_settype": 0, "cairo_surface_get_reference_count": 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URL(fileURLWithPath: #file).deletingLastPathComponent().appendingPathComponent("../Files/") 44 | } 45 | } 46 | -------------------------------------------------------------------------------- /Tests/SwiftELFTests/XCTestManifests.swift: -------------------------------------------------------------------------------- 1 | import XCTest 2 | 3 | #if !canImport(ObjectiveC) 4 | public func allTests() -> [XCTestCaseEntry] { 5 | return [ 6 | testCase(SwiftELFTests.allTests), 7 | ] 8 | } 9 | #endif 10 | --------------------------------------------------------------------------------