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/* VMNetworkInterface.c - Native methods for NetworkInterface class

   Copyright (C) 2003, 2005, 2006, 2008 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif /* HAVE_CONFIG_H */

#include <sys/types.h>

#include <sys/socket.h>

#ifdef HAVE_IFADDRS_H

#include <ifaddrs.h>

#endif

#include <netinet/in.h>

#include <errno.h>

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <net/if.h>

#include <sys/ioctl.h>

/* Required on Solaris. */

#include <unistd.h>

#ifdef HAVE_SYS_SOCKIO_H

# include <sys/sockio.h>

#endif

#include <jni.h>

#include <jcl.h>

#include <cpnative.h>

#include <cpnet.h>

#include "java_net_VMNetworkInterface.h"

int iff_flags(JNIEnv *, jstring, jint *);

static jmethodID java_net_VMNetworkInterface_init;

static jmethodID java_net_VMNetworkInterface_addAddress;

/*

 * Initialize our static method ID's.

 *

 * Class:     java_net_VMNetworkInterface

 * Method:    initIds

 * Signature: ()V

 */

JNIEXPORT void JNICALL

Java_java_net_VMNetworkInterface_initIds (JNIEnv *env, jclass clazz)

{

  java_net_VMNetworkInterface_init =

    (*env)->GetMethodID (env, clazz, "<init>", "(Ljava/lang/String;)V");

  if (java_net_VMNetworkInterface_init == NULL)

    {

      if (!(*env)->ExceptionCheck (env))

        JCL_ThrowException (env, "java/lang/NoSuchMethodError",

                            "VMNetworkinterface.addAddress");

      return;

    }

  java_net_VMNetworkInterface_addAddress =

    (*env)->GetMethodID (env, clazz, "addAddress", "(Ljava/nio/ByteBuffer;)V");

  if (java_net_VMNetworkInterface_addAddress == NULL)

    {

      if (!(*env)->ExceptionCheck (env))

        JCL_ThrowException (env, "java/lang/NoSuchMethodError",

                            "VMNetworkinterface.addAddress");

    }

}

struct netif_entry

{

  char *name;

  jobject netif;

  int numaddrs;

  struct netif_entry *next;

};

#if defined (HAVE_IFADDRS_H) && defined (HAVE_GETIFADDRS)

static void

free_netif_list (JNIEnv *env, struct netif_entry *list)

{

  while (list != NULL)

    {

      struct netif_entry *e = list->next;

      JCL_free (env, list);

      list = e;

    }

}

#endif

/*

 * Returns all local network interfaces as an array.

 */

JNIEXPORT jobjectArray JNICALL

Java_java_net_VMNetworkInterface_getVMInterfaces (JNIEnv * env,

                                                  jclass clazz UNUSED)

{

#if defined (HAVE_IFADDRS_H) && defined (HAVE_GETIFADDRS)

  struct ifaddrs *ifaddrs, *i;

  struct netif_entry *iflist = NULL, *e;

  jobjectArray netifs;

  int numifs = 0;

  int k;

  if (getifaddrs (&ifaddrs) == -1)

    {

      JCL_ThrowException (env, "java/net/SocketException", strerror (errno));

      return NULL;

    }

  for (i = ifaddrs; i != NULL; i = i->ifa_next)

    {

      if (iflist == NULL)

        {

          iflist = JCL_malloc (env, sizeof (struct netif_entry));

          if (iflist == NULL)

            {

              freeifaddrs (ifaddrs);

              return NULL;

            }

          iflist->name = i->ifa_name;

          iflist->numaddrs = 0;

          iflist->next = NULL;

          iflist->netif = (*env)->NewObject (env, clazz, java_net_VMNetworkInterface_init,

                                             (*env)->NewStringUTF (env, i->ifa_name));

          if (iflist->netif == NULL)

            {

              freeifaddrs (ifaddrs);

              JCL_free (env, iflist);

              return NULL;

            }

          e = iflist;

        }

      else

        {

          struct netif_entry *p = NULL;

          for (e = iflist; e != NULL; e = e->next)

            {

              if (strcmp (e->name, i->ifa_name) == 0)

                break;

              p = e;

            }

          if (e == NULL)

            {

              p->next = (struct netif_entry *) JCL_malloc (env, sizeof (struct netif_entry));

              if (p->next == NULL)

                {

                  free_netif_list (env, iflist);

                  freeifaddrs (ifaddrs);

                  return NULL;

                }

              e = p->next;

              e->name = i->ifa_name;

              e->numaddrs = 0;

              e->next = NULL;

              e->netif = (*env)->NewObject (env, clazz, java_net_VMNetworkInterface_init,

                                            (*env)->NewStringUTF (env, i->ifa_name));

              if (e->netif == NULL)

                {

                  free_netif_list (env, iflist);

                  freeifaddrs (ifaddrs);

                  return NULL;

                }

            }

        }

      if (i->ifa_addr == NULL)

        continue;

      if (i->ifa_addr->sa_family == AF_INET)

        {

          struct sockaddr_in *sin = (struct sockaddr_in *) i->ifa_addr;

          jobject buffer = (*env)->NewDirectByteBuffer (env, &(sin->sin_addr.s_addr), 4);

          (*env)->CallVoidMethod (env, e->netif, java_net_VMNetworkInterface_addAddress,

                                  buffer);

          if ((*env)->ExceptionCheck (env))

            {

              free_netif_list (env, iflist);

              freeifaddrs (ifaddrs);

              return NULL;

            }

          (*env)->DeleteLocalRef (env, buffer);

          e->numaddrs++;

        }

#ifdef HAVE_INET6

      else if (i->ifa_addr->sa_family == AF_INET6)

        {

          struct sockaddr_in6 *sin = (struct sockaddr_in6 *) i->ifa_addr;

          jobject buffer = (*env)->NewDirectByteBuffer (env, &(sin->sin6_addr.s6_addr), 16);

          (*env)->CallVoidMethod (env, e->netif, java_net_VMNetworkInterface_addAddress,

                                  buffer);

          if ((*env)->ExceptionCheck (env))

            {

              free_netif_list (env, iflist);

              freeifaddrs (ifaddrs);

              return NULL;

            }

          (*env)->DeleteLocalRef (env, buffer);

          e->numaddrs++;

        }

#endif /* HAVE_INET6 */

    }

  /* Count how many interfaces we have that have addresses. */

  for (e = iflist; e != NULL; e = e->next)

    {

      if (e->numaddrs != 0)

        numifs++;

    }

  netifs = (*env)->NewObjectArray (env, numifs, clazz, NULL);

  k = 0;

  for (e = iflist; e != NULL && k < numifs; e = e->next)

    {

      if (e->numaddrs != 0)

        {

          (*env)->SetObjectArrayElement (env, netifs, k, e->netif);

          (*env)->DeleteLocalRef (env, e->netif);

          k++;

        }

    }

  free_netif_list (env, iflist);

  freeifaddrs (ifaddrs);

  return netifs;

#else

  JCL_ThrowException (env, "java/net/SocketException", "getifaddrs not supported");

  return NULL;

#endif /* HAVE_IFADDRS_H && HAVE_GETIFADDRS */

}

int iff_flags(JNIEnv *env, jstring name, jint *flags)

{

  struct ifreq iff;

  const char *iff_name;

  jint socket;

  int error, retval;

  if ((error = cpnet_openSocketDatagram(env, &socket, AF_INET)))

  {

    return error;

  }

  iff_name = JCL_jstring_to_cstring(env, name);

  memset(&iff, 0, sizeof(iff));

  strcpy(iff.ifr_name, iff_name);

  if (ioctl(socket, SIOCGIFFLAGS, &iff) >= 0)

  {

    *flags = (jint) iff.ifr_flags;

    retval = 0;

  }

  else

  {

    retval = errno;

  }

  cpnet_close(env, socket);

  JCL_free_cstring(env, name, iff_name);

  return retval;

}

JNIEXPORT jboolean JNICALL

Java_java_net_VMNetworkInterface_isUp (JNIEnv *env, jclass class UNUSED,

                                       jstring name)

{

  jint flags;

  int error;

  jboolean retval;

  if ((error = iff_flags(env, name, &flags)))

  {

    JCL_ThrowException(env, "java/net/SocketException",

                       cpnative_getErrorString(error));

    retval = JNI_FALSE;

  }

  else

  {

    retval = (flags & (IFF_UP | IFF_RUNNING))

             ? JNI_TRUE

             : JNI_FALSE;

  }

  return retval;

}

JNIEXPORT jboolean JNICALL

Java_java_net_VMNetworkInterface_isPointToPoint (JNIEnv *env,

                                                 jclass class UNUSED,

                                                 jstring name)

{

  jint flags;

  int error;

  jboolean retval;

  if ((error = iff_flags(env, name, &flags)))

  {

    JCL_ThrowException(env, "java/net/SocketException",

                       cpnative_getErrorString(error));

    retval = JNI_FALSE;

  }

  else

  {

    retval = (flags & IFF_POINTOPOINT) ? JNI_TRUE

                                       : JNI_FALSE;

  }

  return retval;

}

JNIEXPORT jboolean JNICALL

Java_java_net_VMNetworkInterface_isLoopback (JNIEnv *env,

                                             jclass class UNUSED,

                                             jstring name)

{

  jint flags;

  int error;

  jboolean retval;

  if ((error = iff_flags(env, name, &flags)))

  {

    JCL_ThrowException(env, "java/net/SocketException",

                       cpnative_getErrorString(error));

    retval = JNI_FALSE;

  }

  else

  {

    retval = (flags & IFF_LOOPBACK) ? JNI_TRUE : JNI_FALSE;

  }

  return retval;

}

JNIEXPORT jboolean JNICALL

Java_java_net_VMNetworkInterface_supportsMulticast (JNIEnv *env,

                                                    jclass class UNUSED,

                                                    jstring name)

{

  jint flags;

  int error;

  jboolean retval;

  if ((error = iff_flags(env, name, &flags)))

  {

    JCL_ThrowException(env, "java/net/SocketException",

                       cpnative_getErrorString(error));

    retval = JNI_FALSE;

  }

  else

  {

    retval = (flags & IFF_MULTICAST) ? JNI_TRUE : JNI_FALSE;

  }

  return retval;

}

/* end of file */