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// Copyright 2013 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 "chrome/browser/extensions/api/music_manager_private/device_id.h"
#include <ifaddrs.h>
#include <net/if.h>
#include <stddef.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h> // Must be included before ifaddrs.h.
#include <map>
#include "base/bind.h"
#include "base/files/file_enumerator.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/macros.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/threading/thread_restrictions.h"
#include "content/public/browser/browser_thread.h"
namespace {
using extensions::api::DeviceId;
typedef base::Callback<bool(const void* bytes, size_t size)>
IsValidMacAddressCallback;
const char kDiskByUuidDirectoryName[] = "/dev/disk/by-uuid";
const char* const kDeviceNames[] = {
"sda1", "hda1", "dm-0", "xvda1", "sda2", "hda2", "dm-1", "xvda2",
};
// Fedora 15 uses biosdevname feature where Embedded ethernet uses the
// "em" prefix and PCI cards use the p[0-9]c[0-9] format based on PCI
// slot and card information.
const char* const kNetDeviceNamePrefixes[] = {
"eth", "em", "en", "wl", "ww", "p0", "p1", "p2", "p3", "p4", "p5", "p6",
"p7", "p8", "p9", "wlan"
};
// Map from device name to disk uuid
typedef std::map<base::FilePath, base::FilePath> DiskEntries;
std::string GetDiskUuid() {
base::ThreadRestrictions::AssertIOAllowed();
DiskEntries disk_uuids;
base::FileEnumerator files(base::FilePath(kDiskByUuidDirectoryName),
false, // Recursive.
base::FileEnumerator::FILES);
do {
base::FilePath file_path = files.Next();
if (file_path.empty())
break;
base::FilePath target_path;
if (!base::ReadSymbolicLink(file_path, &target_path))
continue;
base::FilePath device_name = target_path.BaseName();
base::FilePath disk_uuid = file_path.BaseName();
disk_uuids[device_name] = disk_uuid;
} while (true);
// Look for first device name matching an entry of |kDeviceNames|.
std::string result;
for (size_t i = 0; i < arraysize(kDeviceNames); i++) {
DiskEntries::iterator it =
disk_uuids.find(base::FilePath(kDeviceNames[i]));
if (it != disk_uuids.end()) {
DVLOG(1) << "Returning uuid: \"" << it->second.value()
<< "\" for device \"" << it->first.value() << "\"";
result = it->second.value();
break;
}
}
// Log failure (at most once) for diagnostic purposes.
static bool error_logged = false;
if (result.empty() && !error_logged) {
error_logged = true;
LOG(ERROR) << "Could not find appropriate disk uuid.";
for (DiskEntries::iterator it = disk_uuids.begin();
it != disk_uuids.end(); ++it) {
LOG(ERROR) << " DeviceID=" << it->first.value() << ", uuid="
<< it->second.value();
}
}
return result;
}
class MacAddressProcessor {
public:
explicit MacAddressProcessor(
const IsValidMacAddressCallback& is_valid_mac_address)
: is_valid_mac_address_(is_valid_mac_address) {
}
bool ProcessInterface(struct ifaddrs *ifaddr,
const char* const prefixes[],
size_t prefixes_count) {
const int MAC_LENGTH = 6;
struct ifreq ifinfo;
memset(&ifinfo, 0, sizeof(ifinfo));
strncpy(ifinfo.ifr_name, ifaddr->ifa_name, sizeof(ifinfo.ifr_name) - 1);
int sd = socket(AF_INET, SOCK_DGRAM, 0);
int result = ioctl(sd, SIOCGIFHWADDR, &ifinfo);
close(sd);
if (result != 0)
return true;
const char* mac_address =
static_cast<const char*>(ifinfo.ifr_hwaddr.sa_data);
if (!is_valid_mac_address_.Run(mac_address, MAC_LENGTH))
return true;
if (!IsValidPrefix(ifinfo.ifr_name, prefixes, prefixes_count))
return true;
// Got one!
found_mac_address_ =
base::ToLowerASCII(base::HexEncode(mac_address, MAC_LENGTH));
return false;
}
std::string mac_address() const { return found_mac_address_; }
private:
bool IsValidPrefix(const char* name,
const char* const prefixes[],
size_t prefixes_count) {
for (size_t i = 0; i < prefixes_count; i++) {
if (strncmp(prefixes[i], name, strlen(prefixes[i])) == 0)
return true;
}
return false;
}
const IsValidMacAddressCallback& is_valid_mac_address_;
std::string found_mac_address_;
};
std::string GetMacAddress(
const IsValidMacAddressCallback& is_valid_mac_address) {
base::ThreadRestrictions::AssertIOAllowed();
struct ifaddrs* ifaddrs;
int rv = getifaddrs(&ifaddrs);
if (rv < 0) {
PLOG(ERROR) << "getifaddrs failed " << rv;
return "";
}
MacAddressProcessor processor(is_valid_mac_address);
for (struct ifaddrs* ifa = ifaddrs; ifa; ifa = ifa->ifa_next) {
bool keep_going = processor.ProcessInterface(
ifa, kNetDeviceNamePrefixes, arraysize(kNetDeviceNamePrefixes));
if (!keep_going)
break;
}
freeifaddrs(ifaddrs);
return processor.mac_address();
}
void GetRawDeviceIdImpl(const IsValidMacAddressCallback& is_valid_mac_address,
const DeviceId::IdCallback& callback) {
base::ThreadRestrictions::AssertIOAllowed();
std::string disk_id = GetDiskUuid();
std::string mac_address = GetMacAddress(is_valid_mac_address);
std::string raw_device_id;
if (!mac_address.empty() && !disk_id.empty()) {
raw_device_id = mac_address + disk_id;
}
content::BrowserThread::PostTask(
content::BrowserThread::UI,
FROM_HERE,
base::Bind(callback, raw_device_id));
}
} // namespace
namespace extensions {
namespace api {
// static
void DeviceId::GetRawDeviceId(const IdCallback& callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
content::BrowserThread::PostTask(
content::BrowserThread::FILE,
FROM_HERE,
base::Bind(GetRawDeviceIdImpl,
base::Bind(DeviceId::IsValidMacAddress),
callback));
}
} // namespace api
} // namespace extensions
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