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/mac/scoped_cftyperef.h"
19 #include "base/memory/scoped_ptr.h"
20 #include "base/strings/string_util.h"
21 #include "base/strings/stringprintf.h"
22 #include "base/strings/sys_string_conversions.h"
26 // Client ID key in the user preferences.
27 NSString* const kLegacyClientIdPreferenceKey = @"ChromiumClientID";
28 NSString* const kClientIdPreferenceKey = @"ChromeClientID";
29 // Current hardware type. This is used to detect that a device has been backed
30 // up and restored to another device, and allows regenerating a new device id.
31 NSString* const kHardwareTypePreferenceKey = @"ClientIDGenerationHardwareType";
32 // Default salt for device ids.
33 const char kDefaultSalt[] = "Salt";
34 // Zero UUID returned on buggy iOS devices.
35 NSString* const kZeroUUID = @"00000000-0000-0000-0000-000000000000";
37 NSString* GenerateClientId() {
38 NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
40 // Try to migrate from legacy client id.
41 NSString* client_id = [defaults stringForKey:kLegacyClientIdPreferenceKey];
43 // Some iOS6 devices return a buggy identifierForVendor:
44 // http://openradar.appspot.com/12377282. If this is the case, revert to
45 // generating a new one.
46 if (!client_id || [client_id isEqualToString:kZeroUUID]) {
47 client_id = [[[UIDevice currentDevice] identifierForVendor] UUIDString];
48 if ([client_id isEqualToString:kZeroUUID])
49 client_id = base::SysUTF8ToNSString(ios::device_util::GetRandomId());
57 namespace device_util {
59 std::string GetPlatform() {
62 sysctlbyname("hw.machine", NULL, &size, NULL, 0);
63 sysctlbyname("hw.machine", WriteInto(&platform, size), &size, NULL, 0);
67 bool RamIsAtLeast512Mb() {
68 // 512MB devices report anywhere from 502-504 MB, use 450 MB just to be safe.
69 return RamIsAtLeast(450);
72 bool RamIsAtLeast1024Mb() {
73 // 1GB devices report anywhere from 975-999 MB, use 900 MB just to be safe.
74 return RamIsAtLeast(900);
77 bool RamIsAtLeast(uint64_t ram_in_mb) {
78 uint64_t memory_size = 0;
79 size_t size = sizeof(memory_size);
80 if (sysctlbyname("hw.memsize", &memory_size, &size, NULL, 0) == 0) {
81 // Anything >= 500M, call high ram.
82 return memory_size >= ram_in_mb * 1024 * 1024;
87 bool IsSingleCoreDevice() {
88 uint64_t cpu_number = 0;
89 size_t sizes = sizeof(cpu_number);
90 sysctlbyname("hw.physicalcpu", &cpu_number, &sizes, NULL, 0);
91 return cpu_number == 1;
94 std::string GetMacAddress(const std::string& interface_name) {
95 std::string mac_string;
96 struct ifaddrs* addresses;
97 if (getifaddrs(&addresses) == 0) {
98 for (struct ifaddrs* address = addresses; address;
99 address = address->ifa_next) {
100 if ((address->ifa_addr->sa_family == AF_LINK) &&
101 strcmp(interface_name.c_str(), address->ifa_name) == 0) {
102 const struct sockaddr_dl* found_address_struct =
103 reinterpret_cast<const struct sockaddr_dl*>(address->ifa_addr);
105 // |found_address_struct->sdl_data| contains the interface name followed
106 // by the interface address. The address part can be accessed based on
107 // the length of the name, that is, |found_address_struct->sdl_nlen|.
108 const unsigned char* found_address =
109 reinterpret_cast<const unsigned char*>(
110 &found_address_struct->sdl_data[
111 found_address_struct->sdl_nlen]);
113 int found_address_length = found_address_struct->sdl_alen;
114 for (int i = 0; i < found_address_length; ++i) {
116 mac_string.push_back(':');
117 base::StringAppendF(&mac_string, "%02X", found_address[i]);
122 freeifaddrs(addresses);
127 std::string GetRandomId() {
128 base::ScopedCFTypeRef<CFUUIDRef> uuid_object(
129 CFUUIDCreate(kCFAllocatorDefault));
130 base::ScopedCFTypeRef<CFStringRef> uuid_string(
131 CFUUIDCreateString(kCFAllocatorDefault, uuid_object));
132 return base::SysCFStringRefToUTF8(uuid_string);
135 std::string GetDeviceIdentifier(const char* salt) {
136 NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
138 NSString* last_seen_hardware =
139 [defaults stringForKey:kHardwareTypePreferenceKey];
140 NSString* current_hardware = base::SysUTF8ToNSString(GetPlatform());
141 if (!last_seen_hardware) {
142 last_seen_hardware = current_hardware;
143 [defaults setObject:current_hardware forKey:kHardwareTypePreferenceKey];
144 [defaults synchronize];
147 NSString* client_id = [defaults stringForKey:kClientIdPreferenceKey];
149 if (!client_id || ![last_seen_hardware isEqualToString:current_hardware]) {
150 client_id = GenerateClientId();
151 [defaults setObject:client_id forKey:kClientIdPreferenceKey];
152 [defaults setObject:current_hardware forKey:kHardwareTypePreferenceKey];
153 [defaults synchronize];
156 return GetSaltedString(base::SysNSStringToUTF8(client_id),
157 salt ? salt : kDefaultSalt);
160 std::string GetSaltedString(const std::string& in_string,
161 const std::string& salt) {
162 DCHECK(salt.length());
163 NSData* hash_data = [base::SysUTF8ToNSString(in_string + salt)
164 dataUsingEncoding:NSUTF8StringEncoding];
166 unsigned char hash[CC_SHA256_DIGEST_LENGTH];
167 CC_SHA256([hash_data bytes], [hash_data length], hash);
168 CFUUIDBytes* uuid_bytes = reinterpret_cast<CFUUIDBytes*>(hash);
170 base::ScopedCFTypeRef<CFUUIDRef> uuid_object(
171 CFUUIDCreateFromUUIDBytes(kCFAllocatorDefault, *uuid_bytes));
172 base::ScopedCFTypeRef<CFStringRef> device_id(
173 CFUUIDCreateString(kCFAllocatorDefault, uuid_object));
174 return base::SysCFStringRefToUTF8(device_id);
177 } // namespace device_util