network_interface.cc

// Copyright 2015 The Chromium OS 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 "thermald/network_interface.h"

#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>

#include <string>

#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/logging.h"

using std::string;

namespace thermald {

bool NetworkInterface::IsUp() {
  base::ScopedFD sockfd(socket(AF_INET, SOCK_DGRAM, 0));
  if (sockfd.get() < 0)
    return false;

  struct ifreq ifr;
  memset(&ifr, 0, sizeof ifr);
  strncpy(ifr.ifr_name, name_.c_str(), IFNAMSIZ);
  ifr.ifr_flags |= IFF_UP;
  if (ioctl(sockfd.get(), SIOCGIFFLAGS, &ifr)) {
    LOG(ERROR) << "[" << name_ << "] Failed to read interface flags: "
               << strerror(errno);
    return false;
  }

  return ifr.ifr_flags & IFF_UP;
}

bool NetworkInterface::Exists(const string &name) {
  return base::DirectoryExists(base::FilePath("/sys/class/net/" + name));
}

}  // namespace thermald