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Handle split APK packages + CLI support

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This commit is contained in:
Katy Coe
2020-09-11 16:38:05 +02:00
parent 973c368dea
commit 4261b5b2d1
4 changed files with 91 additions and 55 deletions
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20
Il2CppInspector.CLI/Program.cs
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@@ -20,8 +20,8 @@ namespace Il2CppInspector.CLI
{
private class Options
{
[Option('i', "bin", Required = false, HelpText = "IL2CPP binary, APK or IPA input file", Default = "libil2cpp.so")]
public string BinaryFile { get; set; }
[Option('i', "bin", Required = false, Separator = ',', HelpText = "IL2CPP binary, APK or IPA input file(s) (single file or comma-separated list for split APKs)", Default = new[] { "libil2cpp.so" })]
public IEnumerable<string> BinaryFiles { get; set; }
[Option('m', "metadata", Required = false, HelpText = "IL2CPP metadata file input (ignored for APK/IPA)", Default = "global-metadata.dat")]
public string MetadataFile { get; set; }
@@ -171,17 +171,19 @@ namespace Il2CppInspector.CLI
Console.WriteLine("Using Unity assemblies at " + unityAssembliesPath);
}
// Check that specified binary files exist
foreach (var file in options.BinaryFiles)
if (!File.Exists(file)) {
Console.Error.WriteLine($"File {file} does not exist");
return 1;
}
// Check files exist and determine whether they're archives or not
List<Il2CppInspector> il2cppInspectors;
using (new Benchmark("Analyze IL2CPP data")) {
if (!File.Exists(options.BinaryFile)) {
Console.Error.WriteLine($"File {options.BinaryFile} does not exist");
return 1;
}
try {
il2cppInspectors = Il2CppInspector.LoadFromPackage(options.BinaryFile);
il2cppInspectors = Il2CppInspector.LoadFromPackage(options.BinaryFiles);
}
catch (Exception ex) {
Console.Error.WriteLine(ex.Message);
@@ -194,7 +196,7 @@ namespace Il2CppInspector.CLI
return 1;
}
il2cppInspectors = Il2CppInspector.LoadFromFile(options.BinaryFile, options.MetadataFile);
il2cppInspectors = Il2CppInspector.LoadFromFile(options.BinaryFiles.First(), options.MetadataFile);
}
}

11
Il2CppInspector.Common/FileFormatReaders/APKReader.cs
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@@ -23,20 +23,19 @@ namespace Il2CppInspector
protected override bool Init() {
// Check if it's a zip file first because ZipFile.OpenRead is extremely slow if it isn't
if (ReadUInt32() != 0x04034B50)
// 0x04034B50 = magic file header
// 0x02014B50 = central directory file header (will appear if we merged a split APK in memory)
var magic = ReadUInt32();
if (magic != 0x04034B50 && magic != 0x02014B50)
return false;
try {
zip = new ZipArchive(BaseStream);
// Check for existence of global-metadata.dat
if (!zip.Entries.Any(f => f.FullName == "assets/bin/Data/Managed/Metadata/global-metadata.dat"))
return false;
// Get list of binary files
binaryFiles = zip.Entries.Where(f => f.FullName.StartsWith("lib/") && f.Name == "libil2cpp.so").ToArray();
// This package doesn't contain an IL2CPP application
// This package doesn't contain an IL2CPP binary
if (!binaryFiles.Any())
return false;
}

96
Il2CppInspector.Common/IL2CPP/Il2CppInspector.cs
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@@ -380,65 +380,98 @@ namespace Il2CppInspector
return res;
}
// Finds and extracts the metadata and IL2CPP binary from an APK or IPA file into MemoryStreams
#region Loaders
// Finds and extracts the metadata and IL2CPP binary from one or more APK files, or one IPA file into MemoryStreams
// Returns null if package not recognized or does not contain an IL2CPP application
public static (MemoryStream Metadata, MemoryStream Binary)? GetStreamsFromPackage(string packageFile, bool silent = false) {
public static (MemoryStream Metadata, MemoryStream Binary)? GetStreamsFromPackage(IEnumerable<string> packageFiles, bool silent = false) {
try {
// Check if it's a zip file first because ZipFile.OpenRead is extremely slow if it isn't
using (BinaryReader zipTest = new BinaryReader(File.Open(packageFile, FileMode.Open))) {
// Check every item is a zip file first because ZipFile.OpenRead is extremely slow if it isn't
foreach (var file in packageFiles)
using (BinaryReader zipTest = new BinaryReader(File.Open(file, FileMode.Open))) {
if (zipTest.ReadUInt32() != 0x04034B50)
return null;
}
using ZipArchive zip = ZipFile.OpenRead(packageFile);
MemoryStream metadataMemoryStream = null, binaryMemoryStream = null;
ZipArchiveEntry ipaBinaryFolder = null;
var binaryFiles = new List<ZipArchiveEntry>();
Stream metadataStream, binaryStream;
// Iterate over each archive looking for the wanted files
// There are three possibilities:
// - A single IPA file containing global-metadata.dat and a single binary supporting one or more architectures
// (we return the binary inside the IPA to be loaded by MachOReader for single arch or UBReader for multi arch)
// - A single APK file containing global-metadata.dat and one or more binaries (one per architecture)
// (we return the entire APK to be loaded by APKReader)
// - Multiple APK files, one of which contains global-metadadata.dat and the others contain one binary each
// (we return all of the binaries re-packed in memory to a new Zip file, to be loaded by APKReader)
foreach (var file in packageFiles) {
// We can't close the files because we might have to read from them after the foreach
var zip = ZipFile.OpenRead(file);
// Check for Android APK
// Check for Android APK (split APKs will only fill one of these two variables)
var metadataFile = zip.Entries.FirstOrDefault(f => f.FullName == "assets/bin/Data/Managed/Metadata/global-metadata.dat");
var binaryFiles = zip.Entries.Where(f => f.FullName.StartsWith("lib/") && f.Name == "libil2cpp.so");
binaryFiles.AddRange(zip.Entries.Where(f => f.FullName.StartsWith("lib/") && f.Name == "libil2cpp.so"));
// Check for iOS IPA
var ipaBinaryFolder = zip.Entries.FirstOrDefault(f => f.FullName.StartsWith("Payload/") && f.FullName.EndsWith(".app/") && f.FullName.Count(x => x == '/') == 2);
ipaBinaryFolder = zip.Entries.FirstOrDefault(f => f.FullName.StartsWith("Payload/") && f.FullName.EndsWith(".app/") && f.FullName.Count(x => x == '/') == 2);
if (ipaBinaryFolder != null) {
var ipaBinaryName = ipaBinaryFolder.FullName[8..^5];
metadataFile = zip.Entries.FirstOrDefault(f => f.FullName == $"Payload/{ipaBinaryName}.app/Data/Managed/Metadata/global-metadata.dat");
binaryFiles = zip.Entries.Where(f => f.FullName == $"Payload/{ipaBinaryName}.app/{ipaBinaryName}");
binaryFiles.AddRange(zip.Entries.Where(f => f.FullName == $"Payload/{ipaBinaryName}.app/{ipaBinaryName}"));
}
// Found metadata?
if (metadataFile != null) {
// Extract the metadata file to memory
if (!silent)
Console.WriteLine($"Extracting metadata from {file}{Path.DirectorySeparatorChar}{metadataFile.FullName}");
metadataMemoryStream = new MemoryStream();
using var metadataStream = metadataFile.Open();
metadataStream.CopyTo(metadataMemoryStream);
metadataMemoryStream.Position = 0;
}
}
// This package doesn't contain an IL2CPP application
if (metadataFile == null || !binaryFiles.Any()) {
Console.Error.WriteLine($"Package {packageFile} does not contain an IL2CPP application");
if (metadataMemoryStream == null || !binaryFiles.Any()) {
Console.Error.WriteLine($"Package does not contain a complete IL2CPP application");
return null;
}
// Extract the metadata file to memory
if (!silent)
Console.WriteLine($"Extracting metadata from {packageFile}{Path.DirectorySeparatorChar}{metadataFile.FullName}");
var metadataMemoryStream = new MemoryStream();
metadataStream = metadataFile.Open();
metadataStream.CopyTo(metadataMemoryStream);
metadataMemoryStream.Position = 0;
// Extract the binary file or package to memory
var binaryMemoryStream = new MemoryStream();
// IPAs will only have one binary (which may or may not be a UB covering multiple architectures)
if (ipaBinaryFolder != null) {
if (!silent)
Console.WriteLine($"Extracting binary from {packageFile}{Path.DirectorySeparatorChar}{binaryFiles.First().FullName}");
Console.WriteLine($"Extracting binary from {packageFiles.First()}{Path.DirectorySeparatorChar}{binaryFiles.First().FullName}");
binaryStream = binaryFiles.First().Open();
// Extract the binary file or package to memory
binaryMemoryStream = new MemoryStream();
using var binaryStream = binaryFiles.First().Open();
binaryStream.CopyTo(binaryMemoryStream);
binaryMemoryStream.Position = 0;
}
// APKs may have one or more binaries, one per architecture
// Single APKs may have one or more binaries, one per architecture
// We'll read the entire APK and load those via APKReader
else if (packageFiles.Count() == 1) {
binaryMemoryStream = new MemoryStream(File.ReadAllBytes(packageFiles.First()));
}
// Split APKs will have one binary per APK
// Roll them up into a new in-memory zip file and load it via APKReader
else {
binaryMemoryStream = new MemoryStream(File.ReadAllBytes(packageFile));
binaryMemoryStream = new MemoryStream();
using (var apkArchive = new ZipArchive(binaryMemoryStream, ZipArchiveMode.Create, true)) {
foreach (var binary in binaryFiles) {
// Don't waste time re-compressing data we just uncompressed
var archiveFile = apkArchive.CreateEntry(binary.FullName, CompressionLevel.NoCompression);
using var archiveFileStream = archiveFile.Open();
using var binarySourceStream = binary.Open();
binarySourceStream.CopyTo(archiveFileStream);
}
}
binaryMemoryStream.Position = 0;
}
return (metadataMemoryStream, binaryMemoryStream);
@@ -450,9 +483,9 @@ namespace Il2CppInspector
}
}
// Load from an APK or IPA file
public static List<Il2CppInspector> LoadFromPackage(string packageFile, bool silent = false) {
var streams = GetStreamsFromPackage(packageFile, silent);
// Load from an IPA or one or more APK files
public static List<Il2CppInspector> LoadFromPackage(IEnumerable<string> packageFiles, bool silent = false) {
var streams = GetStreamsFromPackage(packageFiles, silent);
if (!streams.HasValue)
return null;
return LoadFromStream(streams.Value.Binary, streams.Value.Metadata, silent);
@@ -530,5 +563,6 @@ namespace Il2CppInspector
Console.SetOut(stdout);
return processors;
}
#endregion
}
}

3
Il2CppInspector.GUI/App.xaml.cs
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@@ -35,7 +35,8 @@ namespace Il2CppInspectorGUI
try {
OnStatusUpdate?.Invoke(this, "Extracting package");
var streams = Inspector.GetStreamsFromPackage(packageFile);
// TODO: Accept multiple APKs
var streams = Inspector.GetStreamsFromPackage(new string[] { packageFile });
if (streams == null)
throw new InvalidOperationException("The supplied package is not an APK or IPA file, or does not contain an IL2CPP application");