libjava/java/net/natVMNetworkInterfacePosix.cc

   1 /* Copyright (C) 2003, 2005  Free Software Foundation
   2
   3    This file is part of libgcj.
   4
   5 This software is copyrighted work licensed under the terms of the
   6 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   7 details.  */
   8
   9 #include <config.h>
  10 #include <platform.h>
  11
  12 #ifdef HAVE_UNISTD_H
  13 #include <unistd.h>
  14 #endif
  15 #include <string.h>
  16 #include <errno.h>
  17 #include <stdlib.h>
  18
  19 #include <sys/param.h>
  20 #include <sys/types.h>
  21 #ifdef HAVE_NETINET_IN_H
  22 #include <netinet/in.h>
  23 #endif
  24 #ifdef HAVE_ARPA_INET_H
  25 #include <arpa/inet.h>
  26 #endif
  27 #ifdef HAVE_NETDB_H
  28 #include <netdb.h>
  29 #endif
  30 #ifdef HAVE_SYS_IOCTL_H
  31 #define BSD_COMP /* Get FIONREAD on Solaris2. */
  32 #include <sys/ioctl.h>
  33 #endif
  34 #ifdef HAVE_NET_IF_H
  35 #include <net/if.h>
  36 #endif
  37
  38 #include <gcj/cni.h>
  39 #include <jvm.h>
  40 #include <java/net/Inet4Address.h>
  41 #include <java/net/NetworkInterface.h>
  42 #include <java/net/SocketException.h>
  43 #include <java/net/VMNetworkInterface.h>
  44 #include <java/util/Vector.h>
  45
  46 ::java::util::Vector*
  47 java::net::VMNetworkInterface::getInterfaces ()
  48 {
  49   int fd;
  50   int num_interfaces = 0;
  51   struct ifconf if_data;
  52   struct ifreq* if_record;
  53   ::java::util::Vector* ht = new ::java::util::Vector ();
  54
  55   if_data.ifc_len = 0;
  56   if_data.ifc_buf = NULL;
  57
  58   // Open a (random) socket to have a file descriptor for the ioctl calls.
  59   fd = _Jv_socket (PF_INET, SOCK_DGRAM, htons (IPPROTO_IP));
  60
  61   if (fd < 0)
  62     throw new ::java::net::SocketException;
  63
  64   // Get all interfaces. If not enough buffers are available try it
  65   // with a bigger buffer size.
  66   do
  67     {
  68       num_interfaces += 16;
  69
  70       if_data.ifc_len = sizeof (struct ifreq) * num_interfaces;
  71       if_data.ifc_buf =
  72         (char*) _Jv_Realloc (if_data.ifc_buf, if_data.ifc_len);
  73
  74       // Try to get all local interfaces.
  75       if (::ioctl (fd, SIOCGIFCONF, &if_data) < 0)
  76         throw new java::net::SocketException;
  77     }
  78   while (if_data.ifc_len >= (int) (sizeof (struct ifreq) * num_interfaces));
  79
  80   // Get addresses of all interfaces.
  81   if_record = if_data.ifc_req;
  82
  83   for (int n = 0; n < if_data.ifc_len; n += sizeof (struct ifreq))
  84     {
  85       struct ifreq ifr;
  86
  87       memset (&ifr, 0, sizeof (ifr));
  88       strcpy (ifr.ifr_name, if_record->ifr_name);
  89
  90       // Try to get the IPv4-address of the local interface
  91       if (::ioctl (fd, SIOCGIFADDR, &ifr) < 0)
  92         throw new java::net::SocketException;
  93
  94       int len = 4;
  95       struct sockaddr_in sa = *((sockaddr_in*) &(ifr.ifr_addr));
  96
  97       jbyteArray baddr = JvNewByteArray (len);
  98       memcpy (elements (baddr), &(sa.sin_addr), len);
  99       jstring if_name = JvNewStringLatin1 (if_record->ifr_name);
 100       Inet4Address* address =
 101         new java::net::Inet4Address (baddr, JvNewStringLatin1 (""));
 102       ht->add (new NetworkInterface (if_name, address));
 103       if_record++;
 104     }
 105
 106 #ifdef HAVE_INET6
 107       // FIXME: read /proc/net/if_inet6 (on Linux 2.4)
 108 #endif
 109
 110   _Jv_Free (if_data.ifc_buf);
 111
 112   if (fd >= 0)
 113     _Jv_close (fd);
 114
 115   return ht;
 116 }