netwerk/base/NetworkInfoServiceLinux.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include <string.h>
   8 #include <unistd.h>
   9 #include <sys/ioctl.h>
  10 #include <sys/socket.h>
  11 #include <sys/types.h>
  12 #include <net/if.h>
  13 #include <netdb.h>
  14
  15 #include "mozilla/DebugOnly.h"
  16 #include "mozilla/ScopeExit.h"
  17
  18 #include "NetworkInfoServiceImpl.h"
  19
  20 namespace mozilla {
  21 namespace net {
  22
  23 static nsresult ListInterfaceAddresses(int aFd, const char* aIface,
  24                                        AddrMapType& aAddrMap);
  25
  26 nsresult DoListAddresses(AddrMapType& aAddrMap) {
  27   int fd = socket(AF_INET, SOCK_DGRAM, 0);
  28   if (fd < 0) {
  29     return NS_ERROR_FAILURE;
  30   }
  31
  32   auto autoCloseSocket = MakeScopeExit([&] { close(fd); });
  33
  34   struct ifconf ifconf;
  35   /* 16k of space should be enough to list all interfaces.  Worst case, if it's
  36    * not then we will error out and fail to list addresses.  This should only
  37    * happen on pathological machines with way too many interfaces.
  38    */
  39   char buf[16384];
  40
  41   ifconf.ifc_len = sizeof(buf);
  42   ifconf.ifc_buf = buf;
  43   if (ioctl(fd, SIOCGIFCONF, &ifconf) != 0) {
  44     return NS_ERROR_FAILURE;
  45   }
  46
  47   struct ifreq* ifreq = ifconf.ifc_req;
  48   int i = 0;
  49   while (i < ifconf.ifc_len) {
  50     size_t len = sizeof(struct ifreq);
  51
  52     DebugOnly<nsresult> rv =
  53         ListInterfaceAddresses(fd, ifreq->ifr_name, aAddrMap);
  54     NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "ListInterfaceAddresses failed");
  55
  56     ifreq = (struct ifreq*)((char*)ifreq + len);
  57     i += len;
  58   }
  59
  60   return NS_OK;
  61 }
  62
  63 static nsresult ListInterfaceAddresses(int aFd, const char* aInterface,
  64                                        AddrMapType& aAddrMap) {
  65   struct ifreq ifreq;
  66   memset(&ifreq, 0, sizeof(struct ifreq));
  67   strncpy(ifreq.ifr_name, aInterface, IFNAMSIZ - 1);
  68   if (ioctl(aFd, SIOCGIFADDR, &ifreq) != 0) {
  69     return NS_ERROR_FAILURE;
  70   }
  71
  72   char host[128];
  73   int family;
  74   switch (family = ifreq.ifr_addr.sa_family) {
  75     case AF_INET:
  76     case AF_INET6:
  77       getnameinfo(&ifreq.ifr_addr, sizeof(ifreq.ifr_addr), host, sizeof(host),
  78                   nullptr, 0, NI_NUMERICHOST);
  79       break;
  80     case AF_UNSPEC:
  81       return NS_OK;
  82     default:
  83       // Unknown family.
  84       return NS_OK;
  85   }
  86
  87   nsCString ifaceStr;
  88   ifaceStr.AssignASCII(aInterface);
  89
  90   nsCString addrStr;
  91   addrStr.AssignASCII(host);
  92
  93   aAddrMap.Put(ifaceStr, addrStr);
  94
  95   return NS_OK;
  96 }
  97
  98 }  // namespace net
  99 }  // namespace mozilla