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// Copyright 2019 Google
//
// 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.
#import "Crashlytics/Shared/FIRCLSMachO/FIRCLSMachOBinary.h"
#import "Crashlytics/Shared/FIRCLSMachO/FIRCLSMachOSlice.h"
#import <CommonCrypto/CommonHMAC.h>
static void FIRCLSSafeHexToString(const uint8_t* value, size_t length, char* outputBuffer);
static NSString* FIRCLSNSDataToNSString(NSData* data);
static NSString* FIRCLSHashBytes(const void* bytes, size_t length);
static NSString* FIRCLSHashNSString(NSString* value);
@interface FIRCLSMachOBinary ()
+ (NSString*)hashNSString:(NSString*)value;
@end
@implementation FIRCLSMachOBinary
+ (id)MachOBinaryWithPath:(NSString*)path {
return [[self alloc] initWithURL:[NSURL fileURLWithPath:path]];
}
@synthesize slices = _slices;
- (id)initWithURL:(NSURL*)url {
self = [super init];
if (self) {
_url = [url copy];
if (!FIRCLSMachOFileInitWithPath(&_file, [[_url path] fileSystemRepresentation])) {
return nil;
}
_slices = [NSMutableArray new];
FIRCLSMachOFileEnumerateSlices(&_file, ^(FIRCLSMachOSliceRef slice) {
FIRCLSMachOSlice* sliceObject;
sliceObject = [[FIRCLSMachOSlice alloc] initWithSlice:slice];
[self->_slices addObject:sliceObject];
});
}
return self;
}
- (void)dealloc {
FIRCLSMachOFileDestroy(&_file);
}
- (NSURL*)URL {
return _url;
}
- (NSString*)path {
return [_url path];
}
- (NSString*)instanceIdentifier {
if (_instanceIdentifier) {
return _instanceIdentifier;
}
NSMutableString* prehashedString = [NSMutableString new];
// sort the slices by architecture
NSArray* sortedSlices =
[_slices sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
return [[obj1 architectureName] compare:[obj2 architectureName]];
}];
// append them all into a big string
for (FIRCLSMachOSlice* slice in sortedSlices) {
[prehashedString appendString:[slice uuid]];
}
_instanceIdentifier = [FIRCLSHashNSString(prehashedString) copy];
return _instanceIdentifier;
}
- (void)enumerateUUIDs:(void (^)(NSString* uuid, NSString* architecture))block {
for (FIRCLSMachOSlice* slice in _slices) {
block([slice uuid], [slice architectureName]);
}
}
- (FIRCLSMachOSlice*)sliceForArchitecture:(NSString*)architecture {
for (FIRCLSMachOSlice* slice in [self slices]) {
if ([[slice architectureName] isEqualToString:architecture]) {
return slice;
}
}
return nil;
}
+ (NSString*)hashNSString:(NSString*)value {
return FIRCLSHashNSString(value);
}
@end
// TODO: Functions copied from the SDK. We should figure out a way to share this.
static void FIRCLSSafeHexToString(const uint8_t* value, size_t length, char* outputBuffer) {
const char hex[] = "0123456789abcdef";
if (!value) {
outputBuffer[0] = '\0';
return;
}
for (size_t i = 0; i < length; ++i) {
unsigned char c = value[i];
outputBuffer[i * 2] = hex[c >> 4];
outputBuffer[i * 2 + 1] = hex[c & 0x0F];
}
outputBuffer[length * 2] = '\0'; // null terminate
}
static NSString* FIRCLSNSDataToNSString(NSData* data) {
NSString* string;
char* buffer;
size_t size;
NSUInteger length;
// we need 2 hex char for every byte of data, plus one more spot for a
// null terminator
length = [data length];
size = (length * 2) + 1;
buffer = malloc(sizeof(char) * size);
if (!buffer) {
return nil;
}
FIRCLSSafeHexToString([data bytes], length, buffer);
string = [NSString stringWithUTF8String:buffer];
free(buffer);
return string;
}
static NSString* FIRCLSHashBytes(const void* bytes, size_t length) {
uint8_t digest[CC_SHA1_DIGEST_LENGTH] = {0};
CC_SHA1(bytes, (CC_LONG)length, digest);
NSData* result = [NSData dataWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];
return FIRCLSNSDataToNSString(result);
}
static NSString* FIRCLSHashNSString(NSString* value) {
const char* s = [value cStringUsingEncoding:NSUTF8StringEncoding];
return FIRCLSHashBytes(s, strlen(s));
}
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