1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "base/ios/device_util.h"
7 #include <CommonCrypto/CommonDigest.h>
8 #import <UIKit/UIKit.h>
11 #include <net/if_dl.h>
13 #include <sys/socket.h>
14 #include <sys/sysctl.h>
16 #include "base/ios/ios_util.h"
17 #include "base/logging.h"
18 #include "base/string_util.h"
19 #include "base/stringprintf.h"
20 #include "base/mac/scoped_cftyperef.h"
21 #include "base/memory/scoped_ptr.h"
22 #include "base/sys_string_conversions.h"
26 // Client ID key in the user preferences.
27 NSString* const kLegacyClientIdPreferenceKey = @"ChromiumClientID";
28 NSString* const kClientIdPreferenceKey = @"ChromeClientID";
29 // Default salt for device ids.
30 const char kDefaultSalt[] = "Salt";
31 // Zero UUID returned on buggy iOS devices.
32 NSString* const kZeroUUID = @"00000000-0000-0000-0000-000000000000";
34 NSString* GenerateClientId() {
35 NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
37 // Try to migrate from legacy client id.
38 NSString* client_id = [defaults stringForKey:kLegacyClientIdPreferenceKey];
40 // Some iOS6 devices return a buggy identifierForVendor:
41 // http://openradar.appspot.com/12377282. If this is the case, revert to
42 // generating a new one.
43 if (!client_id || [client_id isEqualToString:kZeroUUID]) {
44 if (base::ios::IsRunningOnIOS6OrLater()) {
45 client_id = [[[UIDevice currentDevice] identifierForVendor] UUIDString];
46 if ([client_id isEqualToString:kZeroUUID])
47 client_id = base::SysUTF8ToNSString(ios::device_util::GetRandomId());
49 client_id = base::SysUTF8ToNSString(ios::device_util::GetRandomId());
58 namespace device_util {
60 std::string GetPlatform() {
63 sysctlbyname("hw.machine", NULL, &size, NULL, 0);
64 sysctlbyname("hw.machine", WriteInto(&platform, size), &size, NULL, 0);
68 bool IsRunningOnHighRamDevice() {
69 uint64_t memory_size = 0;
70 size_t size = sizeof(memory_size);
71 if (sysctlbyname("hw.memsize", &memory_size, &size, NULL, 0) == 0) {
72 // Anything >= 250M, call high ram.
73 return memory_size >= 250 * 1024 * 1024;
78 bool IsSingleCoreDevice() {
79 uint64_t cpu_number = 0;
80 size_t sizes = sizeof(cpu_number);
81 sysctlbyname("hw.physicalcpu", &cpu_number, &sizes, NULL, 0);
82 return cpu_number == 1;
85 std::string GetMacAddress(const std::string& interface_name) {
86 std::string mac_string;
87 struct ifaddrs* addresses;
88 if (getifaddrs(&addresses) == 0) {
89 for (struct ifaddrs* address = addresses; address;
90 address = address->ifa_next) {
91 if ((address->ifa_addr->sa_family == AF_LINK) &&
92 strcmp(interface_name.c_str(), address->ifa_name) == 0) {
93 const struct sockaddr_dl* found_address_struct =
94 reinterpret_cast<const struct sockaddr_dl*>(address->ifa_addr);
96 // |found_address_struct->sdl_data| contains the interface name followed
97 // by the interface address. The address part can be accessed based on
98 // the length of the name, that is, |found_address_struct->sdl_nlen|.
99 const unsigned char* found_address =
100 reinterpret_cast<const unsigned char*>(
101 &found_address_struct->sdl_data[
102 found_address_struct->sdl_nlen]);
104 int found_address_length = found_address_struct->sdl_alen;
105 for (int i = 0; i < found_address_length; ++i) {
107 mac_string.push_back(':');
108 base::StringAppendF(&mac_string, "%02X", found_address[i]);
113 freeifaddrs(addresses);
118 std::string GetRandomId() {
119 base::mac::ScopedCFTypeRef<CFUUIDRef>
120 uuid_object(CFUUIDCreate(kCFAllocatorDefault));
121 base::mac::ScopedCFTypeRef<CFStringRef> uuid_string(
122 CFUUIDCreateString(kCFAllocatorDefault, uuid_object));
123 return base::SysCFStringRefToUTF8(uuid_string);
126 std::string GetDeviceIdentifier(const char* salt) {
127 NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
128 NSString* client_id = [defaults stringForKey:kClientIdPreferenceKey];
131 client_id = GenerateClientId();
132 [defaults setObject:client_id forKey:kClientIdPreferenceKey];
133 [defaults synchronize];
136 NSData* hash_data = [[NSString stringWithFormat:@"%@%s", client_id,
137 salt ? salt : kDefaultSalt] dataUsingEncoding:NSUTF8StringEncoding];
139 unsigned char hash[CC_SHA256_DIGEST_LENGTH];
140 CC_SHA256([hash_data bytes], [hash_data length], hash);
141 CFUUIDBytes* uuid_bytes = reinterpret_cast<CFUUIDBytes*>(hash);
143 base::mac::ScopedCFTypeRef<CFUUIDRef>
144 uuid_object(CFUUIDCreateFromUUIDBytes(kCFAllocatorDefault, *uuid_bytes));
145 base::mac::ScopedCFTypeRef<CFStringRef> device_id(
146 CFUUIDCreateString(kCFAllocatorDefault, uuid_object));
147 return base::SysCFStringRefToUTF8(device_id);
150 } // namespace device_util