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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.

#include "Crashlytics/Crashlytics/Helpers/FIRCLSUtility.h"

#include <mach/mach.h>

#include <dlfcn.h>

#include "Crashlytics/Crashlytics/Components/FIRCLSGlobals.h"

#include "Crashlytics/Crashlytics/Helpers/FIRCLSFeatures.h"

#include "Crashlytics/Crashlytics/Helpers/FIRCLSFile.h"

#import "Crashlytics/Shared/FIRCLSByteUtility.h"

#import "Crashlytics/Shared/FIRCLSUUID.h"

#import <CommonCrypto/CommonHMAC.h>

void FIRCLSLookupFunctionPointer(void* ptr, void (^block)(const char* name, const char* lib)) {

  Dl_info info;

  if (dladdr(ptr, &info) == 0) {

    block(NULL, NULL);

    return;

  }

  const char* name = "unknown";

  const char* lib = "unknown";

  if (info.dli_sname) {

    name = info.dli_sname;

  }

  if (info.dli_fname) {

    lib = info.dli_fname;

  }

  block(name, lib);

}

uint8_t FIRCLSNybbleFromChar(char c) {

  if (c >= '0' && c <= '9') {

    return c - '0';

  }

  if (c >= 'a' && c <= 'f') {

    return c - 'a' + 10;

  }

  if (c >= 'A' && c <= 'F') {

    return c - 'A' + 10;

  }

  return FIRCLSInvalidCharNybble;

}

bool FIRCLSReadMemory(vm_address_t src, void* dest, size_t len) {

  if (!FIRCLSIsValidPointer(src)) {

    return false;

  }

  vm_size_t readSize = len;

  return vm_read_overwrite(mach_task_self(), src, len, (pointer_t)dest, &readSize) == KERN_SUCCESS;

}

bool FIRCLSReadString(vm_address_t src, char** dest, size_t maxlen) {

  char c;

  vm_address_t address;

  if (!dest) {

    return false;

  }

  // Walk the entire string.  Not certain this is perfect...

  for (address = src; address < src + maxlen; ++address) {

    if (!FIRCLSReadMemory(address, &c, 1)) {

      return false;

    }

    if (c == 0) {

      break;

    }

  }

  *dest = (char*)src;

  return true;

}

const char* FIRCLSDupString(const char* string) {

#if CLS_MEMORY_PROTECTION_ENABLED

  char* buffer;

  size_t length;

  if (!string) {

    return NULL;

  }

  length = strlen(string);

  buffer = FIRCLSAllocatorSafeAllocate(_firclsContext.allocator, length + 1, CLS_READONLY);

  memcpy(buffer, string, length);

  buffer[length] = 0;  // null-terminate

  return buffer;

#else

  return strdup(string);

#endif

}

void FIRCLSDispatchAfter(float timeInSeconds, dispatch_queue_t queue, dispatch_block_t block) {

  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(timeInSeconds * NSEC_PER_SEC)), queue,

                 block);

}

bool FIRCLSUnlinkIfExists(const char* path) {

  if (unlink(path) != 0) {

    if (errno != ENOENT) {

      return false;

    }

  }

  return true;

}

NSString* FIRCLSNormalizeUUID(NSString* value) {

  return [[value stringByReplacingOccurrencesOfString:@"-" withString:@""] lowercaseString];

}

NSString* FIRCLSGenerateNormalizedUUID(void) {

  return FIRCLSNormalizeUUID(FIRCLSGenerateUUID());

}

// Redacts a UUID wrapped in parenthesis from a char* using strchr, which is async safe.

// Ex.

//   "foo (bar) (45D62CC2-CFB5-4E33-AB61-B0684627F1B6) baz"

// becomes

//   "foo (bar) (********-****-****-****-************) baz"

void FIRCLSRedactUUID(char* value) {

  if (value == NULL) {

    return;

  }

  char* openParen = value;

  // find the index of the first paren

  while ((openParen = strchr(openParen, '(')) != NULL) {

    // find index of the matching close paren

    const char* closeParen = strchr(openParen, ')');

    if (closeParen == NULL) {

      break;

    }

    // if the distance between them is 37, traverse the characters

    // and replace anything that is not a '-' with '*'

    if (closeParen - openParen == 37) {

      for (int i = 1; i < 37; ++i) {

        if (*(openParen + i) != '-') {

          *(openParen + i) = '*';

        }

      }

      break;

    }

    openParen++;

  }

}

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) {

    FIRCLSErrorLog(@"Unable to malloc in FIRCLSNSDataToNSString");

    return nil;

  }

  FIRCLSSafeHexToString([data bytes], length, buffer);

  string = [NSString stringWithUTF8String:buffer];

  free(buffer);

  return string;

}

void FIRCLSAddOperationAfter(float timeInSeconds, NSOperationQueue* queue, void (^block)(void)) {

  dispatch_queue_t afterQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

  FIRCLSDispatchAfter(timeInSeconds, afterQueue, ^{

    [queue addOperationWithBlock:block];

  });

}

#if DEBUG

void FIRCLSPrintAUUID(const uint8_t* value) {

  CFUUIDRef uuid = CFUUIDCreateFromUUIDBytes(kCFAllocatorDefault, *(CFUUIDBytes*)value);

  NSString* string = CFBridgingRelease(CFUUIDCreateString(kCFAllocatorDefault, uuid));

  CFRelease(uuid);

  FIRCLSDebugLog(@"%@", [[string stringByReplacingOccurrencesOfString:@"-"

                                                           withString:@""] lowercaseString]);

}

#endif