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)
  22 #include <ifaddrs.h>
  23 #endif
  24 #include <net/if.h>
  25 #include <netinet/in.h>
  26
  27 #if defined(OS_MACOSX) && !defined(OS_IOS)
  28 #include <netinet/in_var.h>
  29 #include <sys/ioctl.h>
  30 #endif
  31
  32 #if defined(OS_ANDROID)
  33 #include "net/android/network_library.h"
  34 #endif
  35
  36 namespace net {
  37
  38 namespace {
  39
  40 #if !defined(OS_ANDROID)
  41
  42 struct NetworkInterfaceInfo {
  43   NetworkInterfaceInfo() : permanent(true) { }
  44
  45   bool permanent;  // IPv6 has notion of temporary address. If the address is
  46                    // IPv6 and it's temporary this field will be false.
  47   NetworkInterface interface;
  48 };
  49
  50 // This method will remove permanent IPv6 addresses if a temporary address
  51 // is available for same network interface.
  52 void RemovePermanentIPv6AddressesWhereTemporaryExists(
  53     std::vector<NetworkInterfaceInfo>* infos) {
  54   if (!infos || infos->empty())
  55     return;
  56
  57   // Build a set containing the names of interfaces with a temp IPv6 address
  58   std::set<std::string> ifaces_with_temp_addrs;
  59   std::vector<NetworkInterfaceInfo>::iterator i;
  60   for (i = infos->begin(); i != infos->end(); ++i) {
  61     if (!i->permanent && i->interface.address.size() == kIPv6AddressSize) {
  62       ifaces_with_temp_addrs.insert(i->interface.name);
  63     }
  64   }
  65
  66   // If there are no such interfaces then there's no further work.
  67   if (ifaces_with_temp_addrs.empty())
  68     return;
  69
  70   // Search for permenent addresses belonging to same network interface.
  71   for (i = infos->begin(); i != infos->end(); ) {
  72     // If the address is IPv6 and it's permanent and there is temporary
  73     // address for it, then we can remove this address.
  74     if ((i->interface.address.size() == kIPv6AddressSize) && i->permanent &&
  75         (ifaces_with_temp_addrs.find(i->interface.name) !=
  76             ifaces_with_temp_addrs.end())) {
  77       i = infos->erase(i);
  78     } else {
  79       ++i;
  80     }
  81   }
  82 }
  83
  84 #endif
  85
  86 }  // namespace
  87
  88 bool FileURLToFilePath(const GURL& url, base::FilePath* path) {
  89   *path = base::FilePath();
  90   std::string& file_path_str = const_cast<std::string&>(path->value());
  91   file_path_str.clear();
  92
  93   if (!url.is_valid())
  94     return false;
  95
  96   // Firefox seems to ignore the "host" of a file url if there is one. That is,
  97   // file://foo/bar.txt maps to /bar.txt.
  98   // TODO(dhg): This should probably take into account UNCs which could
  99   // include a hostname other than localhost or blank
 100   std::string old_path = url.path();
 101
 102   if (old_path.empty())
 103     return false;
 104
 105   // GURL stores strings as percent-encoded 8-bit, this will undo if possible.
 106   old_path = UnescapeURLComponent(old_path,
 107       UnescapeRule::SPACES | UnescapeRule::URL_SPECIAL_CHARS);
 108
 109   // Collapse multiple path slashes into a single path slash.
 110   std::string new_path;
 111   do {
 112     new_path = old_path;
 113     ReplaceSubstringsAfterOffset(&new_path, 0, "//", "/");
 114     old_path.swap(new_path);
 115   } while (new_path != old_path);
 116
 117   file_path_str.assign(old_path);
 118
 119   return !file_path_str.empty();
 120 }
 121
 122 bool GetNetworkList(NetworkInterfaceList* networks, int policy) {
 123 #if defined(OS_ANDROID)
 124   std::string network_list = android::GetNetworkList();
 125   base::StringTokenizer network_interfaces(network_list, "\n");
 126   while (network_interfaces.GetNext()) {
 127     std::string network_item = network_interfaces.token();
 128     base::StringTokenizer network_tokenizer(network_item, "\t");
 129     CHECK(network_tokenizer.GetNext());
 130     std::string name = network_tokenizer.token();
 131
 132     CHECK(network_tokenizer.GetNext());
 133     std::string interface_address = network_tokenizer.token();
 134     IPAddressNumber address;
 135     size_t network_prefix = 0;
 136     CHECK(ParseCIDRBlock(network_tokenizer.token(),
 137                          &address,
 138                          &network_prefix));
 139
 140     CHECK(network_tokenizer.GetNext());
 141     uint32 index = 0;
 142     CHECK(base::StringToUint(network_tokenizer.token(), &index));
 143
 144     networks->push_back(
 145         NetworkInterface(name, name, index, 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 #if defined(OS_MACOSX) && !defined(OS_IOS)
 216     // Check if this is a temporary address. Currently this is only supported
 217     // on Mac.
 218     if ((policy & INCLUDE_ONLY_TEMP_IPV6_ADDRESS_IF_POSSIBLE) &&
 219         ioctl_socket >= 0 && addr->sa_family == AF_INET6) {
 220       struct in6_ifreq ifr = {};
 221       strncpy(ifr.ifr_name, interface->ifa_name, sizeof(ifr.ifr_name) - 1);
 222       memcpy(&ifr.ifr_ifru.ifru_addr, interface->ifa_addr,
 223              interface->ifa_addr->sa_len);
 224       int rv = ioctl(ioctl_socket, SIOCGIFAFLAG_IN6, &ifr);
 225       if (rv >= 0) {
 226         network_info.permanent = !(ifr.ifr_ifru.ifru_flags & IN6_IFF_TEMPORARY);
 227       }
 228     }
 229 #endif
 230
 231     IPEndPoint address;
 232     if (address.FromSockAddr(addr, addr_size)) {
 233       uint8 net_mask = 0;
 234       if (interface->ifa_netmask) {
 235         // If not otherwise set, assume the same sa_family as ifa_addr.
 236         if (interface->ifa_netmask->sa_family == 0) {
 237           interface->ifa_netmask->sa_family = addr->sa_family;
 238         }
 239         IPEndPoint netmask;
 240         if (netmask.FromSockAddr(interface->ifa_netmask, addr_size)) {
 241           net_mask = MaskPrefixLength(netmask.address());
 242         }
 243       }
 244       network_info.interface = NetworkInterface(
 245           name, name, if_nametoindex(name.c_str()),
 246           address.address(), net_mask);
 247
 248       network_infos.push_back(NetworkInterfaceInfo(network_info));
 249     }
 250   }
 251   freeifaddrs(interfaces);
 252   if (ioctl_socket >= 0) {
 253     close(ioctl_socket);
 254   }
 255
 256   if (policy & INCLUDE_ONLY_TEMP_IPV6_ADDRESS_IF_POSSIBLE) {
 257     RemovePermanentIPv6AddressesWhereTemporaryExists(&network_infos);
 258   }
 259
 260   for (size_t i = 0; i < network_infos.size(); ++i) {
 261     networks->push_back(network_infos[i].interface);
 262   }
 263   return true;
 264 #endif
 265 }
 266
 267 WifiPHYLayerProtocol GetWifiPHYLayerProtocol() {
 268   return WIFI_PHY_LAYER_PROTOCOL_UNKNOWN;
 269 }
 270
 271 }  // namespace net