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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/ios/device_util.h"
#include <CommonCrypto/CommonDigest.h>
#import <UIKit/UIKit.h>
#include <ifaddrs.h>
#include <net/if_dl.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include "base/logging.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/sys_string_conversions.h"
namespace {
// Client ID key in the user preferences.
NSString* const kLegacyClientIdPreferenceKey = @"ChromiumClientID";
NSString* const kClientIdPreferenceKey = @"ChromeClientID";
// Current hardware type. This is used to detect that a device has been backed
// up and restored to another device, and allows regenerating a new device id.
NSString* const kHardwareTypePreferenceKey = @"ClientIDGenerationHardwareType";
// Default salt for device ids.
const char kDefaultSalt[] = "Salt";
// Zero UUID returned on buggy iOS devices.
NSString* const kZeroUUID = @"00000000-0000-0000-0000-000000000000";
NSString* GenerateClientId() {
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
// Try to migrate from legacy client id.
NSString* client_id = [defaults stringForKey:kLegacyClientIdPreferenceKey];
// Some iOS6 devices return a buggy identifierForVendor:
// http://openradar.appspot.com/12377282. If this is the case, revert to
// generating a new one.
if (!client_id || [client_id isEqualToString:kZeroUUID]) {
client_id = [[[UIDevice currentDevice] identifierForVendor] UUIDString];
if ([client_id isEqualToString:kZeroUUID])
client_id = base::SysUTF8ToNSString(ios::device_util::GetRandomId());
}
return client_id;
}
} // namespace
namespace ios {
namespace device_util {
std::string GetPlatform() {
std::string platform;
size_t size = 0;
sysctlbyname("hw.machine", NULL, &size, NULL, 0);
sysctlbyname("hw.machine", WriteInto(&platform, size), &size, NULL, 0);
return platform;
}
bool RamIsAtLeast512Mb() {
// 512MB devices report anywhere from 502-504 MB, use 450 MB just to be safe.
return RamIsAtLeast(450);
}
bool RamIsAtLeast1024Mb() {
// 1GB devices report anywhere from 975-999 MB, use 900 MB just to be safe.
return RamIsAtLeast(900);
}
bool RamIsAtLeast(uint64_t ram_in_mb) {
uint64_t memory_size = 0;
size_t size = sizeof(memory_size);
if (sysctlbyname("hw.memsize", &memory_size, &size, NULL, 0) == 0) {
// Anything >= 500M, call high ram.
return memory_size >= ram_in_mb * 1024 * 1024;
}
return false;
}
bool IsSingleCoreDevice() {
uint64_t cpu_number = 0;
size_t sizes = sizeof(cpu_number);
sysctlbyname("hw.physicalcpu", &cpu_number, &sizes, NULL, 0);
return cpu_number == 1;
}
std::string GetMacAddress(const std::string& interface_name) {
std::string mac_string;
struct ifaddrs* addresses;
if (getifaddrs(&addresses) == 0) {
for (struct ifaddrs* address = addresses; address;
address = address->ifa_next) {
if ((address->ifa_addr->sa_family == AF_LINK) &&
strcmp(interface_name.c_str(), address->ifa_name) == 0) {
const struct sockaddr_dl* found_address_struct =
reinterpret_cast<const struct sockaddr_dl*>(address->ifa_addr);
// |found_address_struct->sdl_data| contains the interface name followed
// by the interface address. The address part can be accessed based on
// the length of the name, that is, |found_address_struct->sdl_nlen|.
const unsigned char* found_address =
reinterpret_cast<const unsigned char*>(
&found_address_struct->sdl_data[
found_address_struct->sdl_nlen]);
int found_address_length = found_address_struct->sdl_alen;
for (int i = 0; i < found_address_length; ++i) {
if (i != 0)
mac_string.push_back(':');
base::StringAppendF(&mac_string, "%02X", found_address[i]);
}
break;
}
}
freeifaddrs(addresses);
}
return mac_string;
}
std::string GetRandomId() {
base::ScopedCFTypeRef<CFUUIDRef> uuid_object(
CFUUIDCreate(kCFAllocatorDefault));
base::ScopedCFTypeRef<CFStringRef> uuid_string(
CFUUIDCreateString(kCFAllocatorDefault, uuid_object));
return base::SysCFStringRefToUTF8(uuid_string);
}
std::string GetDeviceIdentifier(const char* salt) {
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
NSString* last_seen_hardware =
[defaults stringForKey:kHardwareTypePreferenceKey];
NSString* current_hardware = base::SysUTF8ToNSString(GetPlatform());
if (!last_seen_hardware) {
last_seen_hardware = current_hardware;
[defaults setObject:current_hardware forKey:kHardwareTypePreferenceKey];
[defaults synchronize];
}
NSString* client_id = [defaults stringForKey:kClientIdPreferenceKey];
if (!client_id || ![last_seen_hardware isEqualToString:current_hardware]) {
client_id = GenerateClientId();
[defaults setObject:client_id forKey:kClientIdPreferenceKey];
[defaults setObject:current_hardware forKey:kHardwareTypePreferenceKey];
[defaults synchronize];
}
return GetSaltedString(base::SysNSStringToUTF8(client_id),
salt ? salt : kDefaultSalt);
}
std::string GetSaltedString(const std::string& in_string,
const std::string& salt) {
DCHECK(salt.length());
NSData* hash_data = [base::SysUTF8ToNSString(in_string + salt)
dataUsingEncoding:NSUTF8StringEncoding];
unsigned char hash[CC_SHA256_DIGEST_LENGTH];
CC_SHA256([hash_data bytes], [hash_data length], hash);
CFUUIDBytes* uuid_bytes = reinterpret_cast<CFUUIDBytes*>(hash);
base::ScopedCFTypeRef<CFUUIDRef> uuid_object(
CFUUIDCreateFromUUIDBytes(kCFAllocatorDefault, *uuid_bytes));
base::ScopedCFTypeRef<CFStringRef> device_id(
CFUUIDCreateString(kCFAllocatorDefault, uuid_object));
return base::SysCFStringRefToUTF8(device_id);
}
} // namespace device_util
} // namespace ios
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