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/memory/scoped_ptr.h"
  13 #include "base/strings/string_number_conversions.h"
  14 #include "base/strings/string_tokenizer.h"
  15 #include "base/strings/string_util.h"
  16 #include "base/threading/thread_restrictions.h"
  17 #include "net/base/escape.h"
  18 #include "net/base/ip_endpoint.h"
  19 #include "net/base/net_errors.h"
  20 #include "url/gurl.h"
  21
  22 #if !defined(OS_ANDROID) && !defined(OS_NACL)
  23 #include <ifaddrs.h>
  24 #include <net/if.h>
  25 #include <netinet/in.h>
  26 #endif
  27
  28 #if defined(OS_MACOSX) && !defined(OS_IOS)
  29 #include <net/if_media.h>
  30 #include <netinet/in_var.h>
  31 #include <sys/ioctl.h>
  32 #endif
  33
  34 #if defined(OS_ANDROID)
  35 #include "net/android/network_library.h"
  36 #endif
  37
  38 namespace net {
  39
  40 namespace {
  41
  42 #if !defined(OS_ANDROID)
  43
  44 struct NetworkInterfaceInfo {
  45   NetworkInterfaceInfo() : permanent(true) { }
  46
  47   bool permanent;  // IPv6 has notion of temporary address. If the address is
  48                    // IPv6 and it's temporary this field will be false.
  49   NetworkInterface interface;
  50 };
  51
  52 // This method will remove permanent IPv6 addresses if a temporary address
  53 // is available for same network interface.
  54 void RemovePermanentIPv6AddressesWhereTemporaryExists(
  55     std::vector<NetworkInterfaceInfo>* infos) {
  56   if (!infos || infos->empty())
  57     return;
  58
  59   // Build a set containing the names of interfaces with a temp IPv6 address
  60   std::set<std::string> ifaces_with_temp_addrs;
  61   std::vector<NetworkInterfaceInfo>::iterator i;
  62   for (i = infos->begin(); i != infos->end(); ++i) {
  63     if (!i->permanent && i->interface.address.size() == kIPv6AddressSize) {
  64       ifaces_with_temp_addrs.insert(i->interface.name);
  65     }
  66   }
  67
  68   // If there are no such interfaces then there's no further work.
  69   if (ifaces_with_temp_addrs.empty())
  70     return;
  71
  72   // Search for permenent addresses belonging to same network interface.
  73   for (i = infos->begin(); i != infos->end(); ) {
  74     // If the address is IPv6 and it's permanent and there is temporary
  75     // address for it, then we can remove this address.
  76     if ((i->interface.address.size() == kIPv6AddressSize) && i->permanent &&
  77         (ifaces_with_temp_addrs.find(i->interface.name) !=
  78             ifaces_with_temp_addrs.end())) {
  79       i = infos->erase(i);
  80     } else {
  81       ++i;
  82     }
  83   }
  84 }
  85
  86 #endif
  87
  88 #if defined(OS_MACOSX) && !defined(OS_IOS)
  89
  90 NetworkChangeNotifier::ConnectionType GetNetworkInterfaceType(
  91     int addr_family, const std::string& interface_name) {
  92   NetworkChangeNotifier::ConnectionType type =
  93       NetworkChangeNotifier::CONNECTION_UNKNOWN;
  94
  95   struct ifmediareq ifmr = {};
  96   strncpy(ifmr.ifm_name, interface_name.c_str(), sizeof(ifmr.ifm_name) - 1);
  97
  98   int s = socket(addr_family, SOCK_DGRAM, 0);
  99   if (s == -1) {
 100     return type;
 101   }
 102
 103   if (ioctl(s, SIOCGIFMEDIA, &ifmr) != -1) {
 104     if (ifmr.ifm_current & IFM_IEEE80211) {
 105       type = NetworkChangeNotifier::CONNECTION_WIFI;
 106     } else if (ifmr.ifm_current & IFM_ETHER) {
 107       type = NetworkChangeNotifier::CONNECTION_ETHERNET;
 108     }
 109   }
 110   close(s);
 111   return type;
 112 }
 113
 114 #endif
 115
 116 }  // namespace
 117
 118 bool GetNetworkList(NetworkInterfaceList* networks, int policy) {
 119 #if defined(OS_NACL)
 120   NOTIMPLEMENTED();
 121   return false;
 122 #elif defined(OS_ANDROID)
 123   std::string network_list = android::GetNetworkList();
 124   base::StringTokenizer network_interfaces(network_list, "\n");
 125   while (network_interfaces.GetNext()) {
 126     std::string network_item = network_interfaces.token();
 127     base::StringTokenizer network_tokenizer(network_item, "\t");
 128     CHECK(network_tokenizer.GetNext());
 129     std::string name = network_tokenizer.token();
 130
 131     CHECK(network_tokenizer.GetNext());
 132     std::string interface_address = network_tokenizer.token();
 133     IPAddressNumber address;
 134     size_t network_prefix = 0;
 135     CHECK(ParseCIDRBlock(network_tokenizer.token(),
 136                          &address,
 137                          &network_prefix));
 138
 139     CHECK(network_tokenizer.GetNext());
 140     uint32 index = 0;
 141     CHECK(base::StringToUint(network_tokenizer.token(), &index));
 142
 143     networks->push_back(
 144         NetworkInterface(name,
 145                          name,
 146                          index,
 147                          NetworkChangeNotifier::CONNECTION_UNKNOWN,
 148                          address,
 149                          network_prefix,
 150                          IP_ADDRESS_ATTRIBUTE_NONE));
 151   }
 152   return true;
 153 #else
 154   // getifaddrs() may require IO operations.
 155   base::ThreadRestrictions::AssertIOAllowed();
 156
 157 #if defined(OS_MACOSX) && !defined(OS_IOS)
 158   int ioctl_socket = -1;
 159   if (policy & INCLUDE_ONLY_TEMP_IPV6_ADDRESS_IF_POSSIBLE) {
 160     // we need a socket to query information about temporary address.
 161     ioctl_socket = socket(AF_INET6, SOCK_DGRAM, 0);
 162     DCHECK_GT(ioctl_socket, 0);
 163   }
 164 #endif
 165
 166   ifaddrs *interfaces;
 167   if (getifaddrs(&interfaces) < 0) {
 168     PLOG(ERROR) << "getifaddrs";
 169     return false;
 170   }
 171
 172   std::vector<NetworkInterfaceInfo> network_infos;
 173
 174   // Enumerate the addresses assigned to network interfaces which are up.
 175   for (ifaddrs *interface = interfaces;
 176        interface != NULL;
 177        interface = interface->ifa_next) {
 178     // Skip loopback interfaces, and ones which are down.
 179     if (!(IFF_UP & interface->ifa_flags))
 180       continue;
 181     if (IFF_LOOPBACK & interface->ifa_flags)
 182       continue;
 183     // Skip interfaces with no address configured.
 184     struct sockaddr* addr = interface->ifa_addr;
 185     if (!addr)
 186       continue;
 187
 188     // Skip unspecified addresses (i.e. made of zeroes) and loopback addresses
 189     // configured on non-loopback interfaces.
 190     int addr_size = 0;
 191     if (addr->sa_family == AF_INET6) {
 192       struct sockaddr_in6* addr_in6 =
 193           reinterpret_cast<struct sockaddr_in6*>(addr);
 194       struct in6_addr* sin6_addr = &addr_in6->sin6_addr;
 195       addr_size = sizeof(*addr_in6);
 196       if (IN6_IS_ADDR_LOOPBACK(sin6_addr) ||
 197           IN6_IS_ADDR_UNSPECIFIED(sin6_addr)) {
 198         continue;
 199       }
 200     } else if (addr->sa_family == AF_INET) {
 201       struct sockaddr_in* addr_in =
 202           reinterpret_cast<struct sockaddr_in*>(addr);
 203       addr_size = sizeof(*addr_in);
 204       if (addr_in->sin_addr.s_addr == INADDR_LOOPBACK ||
 205           addr_in->sin_addr.s_addr == 0) {
 206         continue;
 207       }
 208     } else {
 209       // Skip non-IP addresses.
 210       continue;
 211     }
 212
 213     const std::string& name = interface->ifa_name;
 214     // Filter out VMware interfaces, typically named vmnet1 and vmnet8.
 215     if ((policy & EXCLUDE_HOST_SCOPE_VIRTUAL_INTERFACES) &&
 216         ((name.find("vmnet") != std::string::npos) ||
 217          (name.find("vnic") != std::string::npos))) {
 218       continue;
 219     }
 220
 221     NetworkInterfaceInfo network_info;
 222     NetworkChangeNotifier::ConnectionType connection_type =
 223         NetworkChangeNotifier::CONNECTION_UNKNOWN;
 224 #if defined(OS_MACOSX) && !defined(OS_IOS)
 225     // Check if this is a temporary address. Currently this is only supported
 226     // on Mac.
 227     if ((policy & INCLUDE_ONLY_TEMP_IPV6_ADDRESS_IF_POSSIBLE) &&
 228         ioctl_socket >= 0 && addr->sa_family == AF_INET6) {
 229       struct in6_ifreq ifr = {};
 230       strncpy(ifr.ifr_name, interface->ifa_name, sizeof(ifr.ifr_name) - 1);
 231       memcpy(&ifr.ifr_ifru.ifru_addr, interface->ifa_addr,
 232              interface->ifa_addr->sa_len);
 233       int rv = ioctl(ioctl_socket, SIOCGIFAFLAG_IN6, &ifr);
 234       if (rv >= 0) {
 235         network_info.permanent = !(ifr.ifr_ifru.ifru_flags & IN6_IFF_TEMPORARY);
 236       }
 237     }
 238
 239     connection_type = GetNetworkInterfaceType(addr->sa_family, name);
 240 #endif
 241
 242     IPEndPoint address;
 243     if (address.FromSockAddr(addr, addr_size)) {
 244       uint8 net_mask = 0;
 245       if (interface->ifa_netmask) {
 246         // If not otherwise set, assume the same sa_family as ifa_addr.
 247         if (interface->ifa_netmask->sa_family == 0) {
 248           interface->ifa_netmask->sa_family = addr->sa_family;
 249         }
 250         IPEndPoint netmask;
 251         if (netmask.FromSockAddr(interface->ifa_netmask, addr_size)) {
 252           net_mask = MaskPrefixLength(netmask.address());
 253         }
 254       }
 255       network_info.interface = NetworkInterface(name,
 256                                                 name,
 257                                                 if_nametoindex(name.c_str()),
 258                                                 connection_type,
 259                                                 address.address(),
 260                                                 net_mask,
 261                                                 IP_ADDRESS_ATTRIBUTE_NONE);
 262
 263       network_infos.push_back(NetworkInterfaceInfo(network_info));
 264     }
 265   }
 266   freeifaddrs(interfaces);
 267 #if defined(OS_MACOSX) && !defined(OS_IOS)
 268   if (ioctl_socket >= 0) {
 269     close(ioctl_socket);
 270   }
 271 #endif
 272
 273   if (policy & INCLUDE_ONLY_TEMP_IPV6_ADDRESS_IF_POSSIBLE) {
 274     RemovePermanentIPv6AddressesWhereTemporaryExists(&network_infos);
 275   }
 276
 277   for (size_t i = 0; i < network_infos.size(); ++i) {
 278     networks->push_back(network_infos[i].interface);
 279   }
 280   return true;
 281 #endif
 282 }
 283
 284 WifiPHYLayerProtocol GetWifiPHYLayerProtocol() {
 285   return WIFI_PHY_LAYER_PROTOCOL_UNKNOWN;
 286 }
 287
 288 scoped_ptr<ScopedWifiOptions> SetWifiOptions(int options) {
 289   return scoped_ptr<ScopedWifiOptions>();
 290 }
 291
 292
 293 }  // namespace net