net/base/net_util_mac.cc

   1 // Copyright (c) 2014 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.
   4
   5 #include "net/base/net_util_mac.h"
   6
   7 #include <ifaddrs.h>
   8 #include <net/if.h>
   9 #include <netinet/in.h>
  10 #include <set>
  11 #include <sys/types.h>
  12
  13 #include "base/files/file_path.h"
  14 #include "base/logging.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/strings/string_number_conversions.h"
  17 #include "base/strings/string_tokenizer.h"
  18 #include "base/strings/string_util.h"
  19 #include "base/threading/thread_restrictions.h"
  20 #include "net/base/escape.h"
  21 #include "net/base/ip_endpoint.h"
  22 #include "net/base/net_errors.h"
  23 #include "net/base/net_util_posix.h"
  24 #include "url/gurl.h"
  25
  26 #if !defined(OS_IOS)
  27 #include <net/if_media.h>
  28 #include <netinet/in_var.h>
  29 #include <sys/ioctl.h>
  30 #endif  // !OS_IOS
  31
  32 namespace net {
  33
  34 namespace {
  35
  36 #if !defined(OS_IOS)
  37
  38 // MacOSX implementation of IPAttributesGetterMac which calls ioctl on socket to
  39 // retrieve IP attributes.
  40 class IPAttributesGetterMacImpl : public internal::IPAttributesGetterMac {
  41  public:
  42   IPAttributesGetterMacImpl();
  43   ~IPAttributesGetterMacImpl() override;
  44   bool IsInitialized() const override;
  45   bool GetIPAttributes(const char* ifname,
  46                        const sockaddr* sock_addr,
  47                        int* native_attributes) override;
  48
  49  private:
  50   int ioctl_socket_;
  51 };
  52
  53 IPAttributesGetterMacImpl::IPAttributesGetterMacImpl()
  54     : ioctl_socket_(socket(AF_INET6, SOCK_DGRAM, 0)) {
  55   DCHECK_GE(ioctl_socket_, 0);
  56 }
  57
  58 bool IPAttributesGetterMacImpl::IsInitialized() const {
  59   return ioctl_socket_ >= 0;
  60 }
  61
  62 IPAttributesGetterMacImpl::~IPAttributesGetterMacImpl() {
  63   if (ioctl_socket_ >= 0) {
  64     close(ioctl_socket_);
  65   }
  66 }
  67
  68 bool IPAttributesGetterMacImpl::GetIPAttributes(const char* ifname,
  69                                                 const sockaddr* sock_addr,
  70                                                 int* native_attributes) {
  71   struct in6_ifreq ifr = {};
  72   strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name) - 1);
  73   memcpy(&ifr.ifr_ifru.ifru_addr, sock_addr, sock_addr->sa_len);
  74   int rv = ioctl(ioctl_socket_, SIOCGIFAFLAG_IN6, &ifr);
  75   if (rv >= 0) {
  76     *native_attributes = ifr.ifr_ifru.ifru_flags;
  77   }
  78   return (rv >= 0);
  79 }
  80
  81 // When returning true, the platform native IPv6 address attributes were
  82 // successfully converted to net IP address attributes. Otherwise, returning
  83 // false and the caller should drop the IP address which can't be used by the
  84 // application layer.
  85 bool TryConvertNativeToNetIPAttributes(int native_attributes,
  86                                        int* net_attributes) {
  87   // For MacOSX, we disallow addresses with attributes IN6_IFF_ANYCASE,
  88   // IN6_IFF_DUPLICATED, IN6_IFF_TENTATIVE, and IN6_IFF_DETACHED as these are
  89   // still progressing through duplicated address detection (DAD) or are not
  90   // suitable to be used in an one-to-one communication and shouldn't be used
  91   // by the application layer.
  92   if (native_attributes & (IN6_IFF_ANYCAST | IN6_IFF_DUPLICATED |
  93                            IN6_IFF_TENTATIVE | IN6_IFF_DETACHED)) {
  94     return false;
  95   }
  96
  97   if (native_attributes & IN6_IFF_TEMPORARY) {
  98     *net_attributes |= IP_ADDRESS_ATTRIBUTE_TEMPORARY;
  99   }
 100
 101   if (native_attributes & IN6_IFF_DEPRECATED) {
 102     *net_attributes |= IP_ADDRESS_ATTRIBUTE_DEPRECATED;
 103   }
 104
 105   return true;
 106 }
 107
 108 NetworkChangeNotifier::ConnectionType GetNetworkInterfaceType(
 109     int addr_family,
 110     const std::string& interface_name) {
 111   NetworkChangeNotifier::ConnectionType type =
 112       NetworkChangeNotifier::CONNECTION_UNKNOWN;
 113
 114   struct ifmediareq ifmr = {};
 115   strncpy(ifmr.ifm_name, interface_name.c_str(), sizeof(ifmr.ifm_name) - 1);
 116
 117   int s = socket(addr_family, SOCK_DGRAM, 0);
 118   if (s == -1) {
 119     return type;
 120   }
 121
 122   if (ioctl(s, SIOCGIFMEDIA, &ifmr) != -1) {
 123     if (ifmr.ifm_current & IFM_IEEE80211) {
 124       type = NetworkChangeNotifier::CONNECTION_WIFI;
 125     } else if (ifmr.ifm_current & IFM_ETHER) {
 126       type = NetworkChangeNotifier::CONNECTION_ETHERNET;
 127     }
 128   }
 129   close(s);
 130   return type;
 131 }
 132
 133 #endif  // !OS_IOS
 134 }  // namespace
 135
 136 namespace internal {
 137
 138 bool GetNetworkListImpl(NetworkInterfaceList* networks,
 139                         int policy,
 140                         const ifaddrs* interfaces,
 141                         IPAttributesGetterMac* ip_attributes_getter) {
 142   // Enumerate the addresses assigned to network interfaces which are up.
 143   for (const ifaddrs* interface = interfaces; interface != NULL;
 144        interface = interface->ifa_next) {
 145     // Skip loopback interfaces, and ones which are down.
 146     if (!(IFF_RUNNING & interface->ifa_flags))
 147       continue;
 148     if (IFF_LOOPBACK & interface->ifa_flags)
 149       continue;
 150     // Skip interfaces with no address configured.
 151     struct sockaddr* addr = interface->ifa_addr;
 152     if (!addr)
 153       continue;
 154
 155     // Skip unspecified addresses (i.e. made of zeroes) and loopback addresses
 156     // configured on non-loopback interfaces.
 157     if (IsLoopbackOrUnspecifiedAddress(addr))
 158       continue;
 159
 160     const std::string& name = interface->ifa_name;
 161     // Filter out VMware interfaces, typically named vmnet1 and vmnet8.
 162     if (ShouldIgnoreInterface(name, policy)) {
 163       continue;
 164     }
 165
 166     NetworkChangeNotifier::ConnectionType connection_type =
 167         NetworkChangeNotifier::CONNECTION_UNKNOWN;
 168
 169     int ip_attributes = IP_ADDRESS_ATTRIBUTE_NONE;
 170
 171 #if !defined(OS_IOS)
 172     // Retrieve native ip attributes and convert to net version if a getter is
 173     // given.
 174     if (ip_attributes_getter && ip_attributes_getter->IsInitialized()) {
 175       int native_attributes = 0;
 176       if (addr->sa_family == AF_INET6 &&
 177           ip_attributes_getter->GetIPAttributes(
 178               interface->ifa_name, interface->ifa_addr, &native_attributes)) {
 179         if (!TryConvertNativeToNetIPAttributes(native_attributes,
 180                                                &ip_attributes)) {
 181           continue;
 182         }
 183       }
 184     }
 185
 186     connection_type = GetNetworkInterfaceType(addr->sa_family, name);
 187 #endif  // !OS_IOS
 188
 189     IPEndPoint address;
 190
 191     int addr_size = 0;
 192     if (addr->sa_family == AF_INET6) {
 193       addr_size = sizeof(sockaddr_in6);
 194     } else if (addr->sa_family == AF_INET) {
 195       addr_size = sizeof(sockaddr_in);
 196     }
 197
 198     if (address.FromSockAddr(addr, addr_size)) {
 199       uint8 prefix_length = 0;
 200       if (interface->ifa_netmask) {
 201         // If not otherwise set, assume the same sa_family as ifa_addr.
 202         if (interface->ifa_netmask->sa_family == 0) {
 203           interface->ifa_netmask->sa_family = addr->sa_family;
 204         }
 205         IPEndPoint netmask;
 206         if (netmask.FromSockAddr(interface->ifa_netmask, addr_size)) {
 207           prefix_length = MaskPrefixLength(netmask.address());
 208         }
 209       }
 210       networks->push_back(NetworkInterface(
 211           name, name, if_nametoindex(name.c_str()), connection_type,
 212           address.address(), prefix_length, ip_attributes));
 213     }
 214   }
 215
 216   return true;
 217 }
 218
 219 }  // namespace internal
 220
 221 bool GetNetworkList(NetworkInterfaceList* networks, int policy) {
 222   if (networks == NULL)
 223     return false;
 224
 225   // getifaddrs() may require IO operations.
 226   base::ThreadRestrictions::AssertIOAllowed();
 227
 228   ifaddrs* interfaces;
 229   if (getifaddrs(&interfaces) < 0) {
 230     PLOG(ERROR) << "getifaddrs";
 231     return false;
 232   }
 233
 234   scoped_ptr<internal::IPAttributesGetterMac> ip_attributes_getter;
 235
 236 #if !defined(OS_IOS)
 237   ip_attributes_getter.reset(new IPAttributesGetterMacImpl());
 238 #endif
 239
 240   bool result = internal::GetNetworkListImpl(networks, policy, interfaces,
 241                                              ip_attributes_getter.get());
 242   freeifaddrs(interfaces);
 243   return result;
 244 }
 245
 246 }  // namespace net