Implements iOS device util methods.

base/ios/device_util.mm

+// 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 <Foundation/Foundation.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/string_util.h"
+#include "base/stringprintf.h"
+#include "base/mac/scoped_cftyperef.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/sys_string_conversions.h"
+
+namespace {
+
+// Client ID key in the user preferences.
+NSString* const kClientIdPreferenceKey = @"ChromiumClientID";
+// Default salt for device ids.
+const char kDefaultSalt[] = "Salt";
+
+}  // 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 IsRunningOnHighRamDevice() {
+  u_int64_t memory_size = 0;
+  size_t size = sizeof(memory_size);
+  if (sysctlbyname("hw.memsize", &memory_size, &size, NULL, 0) == 0) {
+    // Anything >= 250M, call high ram.
+    return memory_size >= 250 * 1024 * 1024;
+  }
+  return false;
+}
+
+bool IsSingleCoreDevice() {
+  u_int64_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) {

[stuartmorgan, 2012/07/30 14:28:54]

This should be indented one less.

[Chen Yu, 2012/07/30 16:15:45]

Done.

+        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)
+            base::StringAppendF(&mac_string, ":");
+          base::StringAppendF(&mac_string, "%02X", found_address[i]);
+        }
+        break;
+      }
+    }
+    freeifaddrs(addresses);
+  }
+  return mac_string;
+}
+
+std::string GetRandomId() {
+  base::mac::ScopedCFTypeRef<CFUUIDRef>
+      uuid_object(CFUUIDCreate(kCFAllocatorDefault));
+  base::mac::ScopedCFTypeRef<CFStringRef> uuid_string(
+      CFUUIDCreateString(kCFAllocatorDefault, uuid_object));
+  return base::SysCFStringRefToUTF8(uuid_string);
+}
+
+std::string GetDeviceIdentifier(const char* salt) {
+  NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
+  NSString* client_id = [defaults stringForKey:kClientIdPreferenceKey];
+
+  if (!client_id) {
+    client_id = base::SysUTF8ToNSString(GetRandomId());
+    [defaults setObject:client_id forKey:kClientIdPreferenceKey];
+    [defaults synchronize];
+  }
+
+  NSData* hash_data = [[NSString stringWithFormat:@"%@%s", client_id,
+      salt ? salt : kDefaultSalt] dataUsingEncoding:NSUTF8StringEncoding];
+
+  unsigned char hash[CC_SHA256_DIGEST_LENGTH];
+  void* result = CC_SHA256([hash_data bytes], [hash_data length], hash);
+  DCHECK(result == hash);

[stuartmorgan, 2012/07/30 14:28:54]

DCHECK_EQ (although why are we DCHECKing this? It's not clear to me why it
matters)

[Chen Yu, 2012/07/30 16:15:45]

DCHECK removed; also changed the way to access sha256.

+  CFUUIDBytes* uuid_bytes = static_cast<CFUUIDBytes*>(result);
+
+  base::mac::ScopedCFTypeRef<CFUUIDRef>
+      uuid_object(CFUUIDCreateFromUUIDBytes(kCFAllocatorDefault, *uuid_bytes));
+  base::mac::ScopedCFTypeRef<CFStringRef> device_id(
+      CFUUIDCreateString(kCFAllocatorDefault, uuid_object));
+  return base::SysCFStringRefToUTF8(device_id);
+}
+
+}  // namespace device_util
+}  // namespace ios