net/base/net_util_posix.cc

   1 // Copyright (c) 2011 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.h"
   6
   7 #include <set>
   8 #include <sys/types.h>
   9
  10 #include "base/files/file_path.h"
  11 #include "base/logging.h"
  12 #include "base/strings/string_number_conversions.h"
  13 #include "base/strings/string_tokenizer.h"
  14 #include "base/strings/string_util.h"
  15 #include "base/threading/thread_restrictions.h"
  16 #include "net/base/escape.h"
  17 #include "net/base/ip_endpoint.h"
  18 #include "net/base/net_errors.h"
  19 #include "url/gurl.h"
  20
  21 #if !defined(OS_ANDROID) && !defined(OS_NACL)
  22 #include <ifaddrs.h>
  23 #include <net/if.h>
  24 #include <netinet/in.h>
  25 #endif
  26
  27 #if defined(OS_MACOSX) && !defined(OS_IOS)
  28 #include <net/if_media.h>
  29 #include <netinet/in_var.h>
  30 #include <sys/ioctl.h>
  31 #endif
  32
  33 #if defined(OS_ANDROID)
  34 #include "net/android/network_library.h"
  35 #endif
  36
  37 namespace net {
  38
  39 namespace {
  40
  41 #if !defined(OS_ANDROID)
  42
  43 struct NetworkInterfaceInfo {
  44   NetworkInterfaceInfo() : permanent(true) { }
  45
  46   bool permanent;  // IPv6 has notion of temporary address. If the address is
  47                    // IPv6 and it's temporary this field will be false.
  48   NetworkInterface interface;
  49 };
  50
  51 // This method will remove permanent IPv6 addresses if a temporary address
  52 // is available for same network interface.
  53 void RemovePermanentIPv6AddressesWhereTemporaryExists(
  54     std::vector<NetworkInterfaceInfo>* infos) {
  55   if (!infos || infos->empty())
  56     return;
  57
  58   // Build a set containing the names of interfaces with a temp IPv6 address
  59   std::set<std::string> ifaces_with_temp_addrs;
  60   std::vector<NetworkInterfaceInfo>::iterator i;
  61   for (i = infos->begin(); i != infos->end(); ++i) {
  62     if (!i->permanent && i->interface.address.size() == kIPv6AddressSize) {
  63       ifaces_with_temp_addrs.insert(i->interface.name);
  64     }
  65   }
  66
  67   // If there are no such interfaces then there's no further work.
  68   if (ifaces_with_temp_addrs.empty())
  69     return;
  70
  71   // Search for permenent addresses belonging to same network interface.
  72   for (i = infos->begin(); i != infos->end(); ) {
  73     // If the address is IPv6 and it's permanent and there is temporary
  74     // address for it, then we can remove this address.
  75     if ((i->interface.address.size() == kIPv6AddressSize) && i->permanent &&
  76         (ifaces_with_temp_addrs.find(i->interface.name) !=
  77             ifaces_with_temp_addrs.end())) {
  78       i = infos->erase(i);
  79     } else {
  80       ++i;
  81     }
  82   }
  83 }
  84
  85 #endif
  86
  87 #if defined(OS_MACOSX) && !defined(OS_IOS)
  88
  89 NetworkChangeNotifier::ConnectionType GetNetworkInterfaceType(
  90     int addr_family, const std::string& interface_name) {
  91   NetworkChangeNotifier::ConnectionType type =
  92       NetworkChangeNotifier::CONNECTION_UNKNOWN;
  93
  94   struct ifmediareq ifmr = {};
  95   strncpy(ifmr.ifm_name, interface_name.c_str(), sizeof(ifmr.ifm_name) - 1);
  96
  97   int s = socket(addr_family, SOCK_DGRAM, 0);
  98   if (s == -1) {
  99     return type;
 100   }
 101
 102   if (ioctl(s, SIOCGIFMEDIA, &ifmr) != -1) {
 103     if (ifmr.ifm_current & IFM_IEEE80211) {
 104       type = NetworkChangeNotifier::CONNECTION_WIFI;
 105     } else if (ifmr.ifm_current & IFM_ETHER) {
 106       type = NetworkChangeNotifier::CONNECTION_ETHERNET;
 107     }
 108   }
 109   close(s);
 110   return type;
 111 }
 112
 113 #endif
 114
 115 }  // namespace
 116
 117 bool GetNetworkList(NetworkInterfaceList* networks, int policy) {
 118 #if defined(OS_NACL)
 119   NOTIMPLEMENTED();
 120   return false;
 121 #elif defined(OS_ANDROID)
 122   std::string network_list = android::GetNetworkList();
 123   base::StringTokenizer network_interfaces(network_list, "\n");
 124   while (network_interfaces.GetNext()) {
 125     std::string network_item = network_interfaces.token();
 126     base::StringTokenizer network_tokenizer(network_item, "\t");
 127     CHECK(network_tokenizer.GetNext());
 128     std::string name = network_tokenizer.token();
 129
 130     CHECK(network_tokenizer.GetNext());
 131     std::string interface_address = network_tokenizer.token();
 132     IPAddressNumber address;
 133     size_t network_prefix = 0;
 134     CHECK(ParseCIDRBlock(network_tokenizer.token(),
 135                          &address,
 136                          &network_prefix));
 137
 138     CHECK(network_tokenizer.GetNext());
 139     uint32 index = 0;
 140     CHECK(base::StringToUint(network_tokenizer.token(), &index));
 141
 142     networks->push_back(
 143         NetworkInterface(name, name, index,
 144                          NetworkChangeNotifier::CONNECTION_UNKNOWN,
 145                          address, network_prefix));
 146   }
 147   return true;
 148 #else
 149   // getifaddrs() may require IO operations.
 150   base::ThreadRestrictions::AssertIOAllowed();
 151
 152   int ioctl_socket = -1;
 153   if (policy & INCLUDE_ONLY_TEMP_IPV6_ADDRESS_IF_POSSIBLE) {
 154     // we need a socket to query information about temporary address.
 155     ioctl_socket = socket(AF_INET6, SOCK_DGRAM, 0);
 156     DCHECK_GT(ioctl_socket, 0);
 157   }
 158
 159   ifaddrs *interfaces;
 160   if (getifaddrs(&interfaces) < 0) {
 161     PLOG(ERROR) << "getifaddrs";
 162     return false;
 163   }
 164
 165   std::vector<NetworkInterfaceInfo> network_infos;
 166
 167   // Enumerate the addresses assigned to network interfaces which are up.
 168   for (ifaddrs *interface = interfaces;
 169        interface != NULL;
 170        interface = interface->ifa_next) {
 171     // Skip loopback interfaces, and ones which are down.
 172     if (!(IFF_UP & interface->ifa_flags))
 173       continue;
 174     if (IFF_LOOPBACK & interface->ifa_flags)
 175       continue;
 176     // Skip interfaces with no address configured.
 177     struct sockaddr* addr = interface->ifa_addr;
 178     if (!addr)
 179       continue;
 180
 181     // Skip unspecified addresses (i.e. made of zeroes) and loopback addresses
 182     // configured on non-loopback interfaces.
 183     int addr_size = 0;
 184     if (addr->sa_family == AF_INET6) {
 185       struct sockaddr_in6* addr_in6 =
 186           reinterpret_cast<struct sockaddr_in6*>(addr);
 187       struct in6_addr* sin6_addr = &addr_in6->sin6_addr;
 188       addr_size = sizeof(*addr_in6);
 189       if (IN6_IS_ADDR_LOOPBACK(sin6_addr) ||
 190           IN6_IS_ADDR_UNSPECIFIED(sin6_addr)) {
 191         continue;
 192       }
 193     } else if (addr->sa_family == AF_INET) {
 194       struct sockaddr_in* addr_in =
 195           reinterpret_cast<struct sockaddr_in*>(addr);
 196       addr_size = sizeof(*addr_in);
 197       if (addr_in->sin_addr.s_addr == INADDR_LOOPBACK ||
 198           addr_in->sin_addr.s_addr == 0) {
 199         continue;
 200       }
 201     } else {
 202       // Skip non-IP addresses.
 203       continue;
 204     }
 205
 206     const std::string& name = interface->ifa_name;
 207     // Filter out VMware interfaces, typically named vmnet1 and vmnet8.
 208     if ((policy & EXCLUDE_HOST_SCOPE_VIRTUAL_INTERFACES) &&
 209         ((name.find("vmnet") != std::string::npos) ||
 210          (name.find("vnic") != std::string::npos))) {
 211       continue;
 212     }
 213
 214     NetworkInterfaceInfo network_info;
 215     NetworkChangeNotifier::ConnectionType connection_type =
 216         NetworkChangeNotifier::CONNECTION_UNKNOWN;
 217 #if defined(OS_MACOSX) && !defined(OS_IOS)
 218     // Check if this is a temporary address. Currently this is only supported
 219     // on Mac.
 220     if ((policy & INCLUDE_ONLY_TEMP_IPV6_ADDRESS_IF_POSSIBLE) &&
 221         ioctl_socket >= 0 && addr->sa_family == AF_INET6) {
 222       struct in6_ifreq ifr = {};
 223       strncpy(ifr.ifr_name, interface->ifa_name, sizeof(ifr.ifr_name) - 1);
 224       memcpy(&ifr.ifr_ifru.ifru_addr, interface->ifa_addr,
 225              interface->ifa_addr->sa_len);
 226       int rv = ioctl(ioctl_socket, SIOCGIFAFLAG_IN6, &ifr);
 227       if (rv >= 0) {
 228         network_info.permanent = !(ifr.ifr_ifru.ifru_flags & IN6_IFF_TEMPORARY);
 229       }
 230     }
 231
 232     connection_type = GetNetworkInterfaceType(addr->sa_family, name);
 233 #endif
 234
 235     IPEndPoint address;
 236     if (address.FromSockAddr(addr, addr_size)) {
 237       uint8 net_mask = 0;
 238       if (interface->ifa_netmask) {
 239         // If not otherwise set, assume the same sa_family as ifa_addr.
 240         if (interface->ifa_netmask->sa_family == 0) {
 241           interface->ifa_netmask->sa_family = addr->sa_family;
 242         }
 243         IPEndPoint netmask;
 244         if (netmask.FromSockAddr(interface->ifa_netmask, addr_size)) {
 245           net_mask = MaskPrefixLength(netmask.address());
 246         }
 247       }
 248       network_info.interface = NetworkInterface(
 249           name, name, if_nametoindex(name.c_str()),
 250           connection_type, address.address(), net_mask);
 251
 252       network_infos.push_back(NetworkInterfaceInfo(network_info));
 253     }
 254   }
 255   freeifaddrs(interfaces);
 256   if (ioctl_socket >= 0) {
 257     close(ioctl_socket);
 258   }
 259
 260   if (policy & INCLUDE_ONLY_TEMP_IPV6_ADDRESS_IF_POSSIBLE) {
 261     RemovePermanentIPv6AddressesWhereTemporaryExists(&network_infos);
 262   }
 263
 264   for (size_t i = 0; i < network_infos.size(); ++i) {
 265     networks->push_back(network_infos[i].interface);
 266   }
 267   return true;
 268 #endif
 269 }
 270
 271 WifiPHYLayerProtocol GetWifiPHYLayerProtocol() {
 272   return WIFI_PHY_LAYER_PROTOCOL_UNKNOWN;
 273 }
 274
 275 }  // namespace net