/* Copyright (C) 1992-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

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

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <string.h>

#include <sys/socket.h>

#include <hurd.h>

#include <hurd/fd.h>

#include <hurd/socket.h>

/* Put the address of the peer connected to socket FD into *ADDR

   (which is *LEN bytes long), and its actual length into *LEN.  */

int

__getpeername (int fd, __SOCKADDR_ARG addrarg, socklen_t *len)

{

  error_t err;

  mach_msg_type_number_t buflen = *len;

  int type;

  struct sockaddr *addr = addrarg.__sockaddr__;

  char *buf = (char *) addr;

  addr_port_t aport;

  if (err = HURD_DPORT_USE (fd, __socket_peername (port, &aport)))

    return __hurd_dfail (fd, err);

  err = __socket_whatis_address (aport, &type, &buf, &buflen);

  __mach_port_deallocate (__mach_task_self (), aport);

  if (err)

    return __hurd_dfail (fd, err);

  if (*len > buflen)

    *len = buflen;

  if (buf != (char *) addr)

    {

      memcpy (addr, buf, *len);

      __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);

    }

  const sa_family_t family = type;

  if (*len > offsetof (struct sockaddr, sa_family))

    {

      if (*len < (char *) (&addr->sa_family + 1) - (char *) addr)

	memcpy (&addr->sa_family, &family,

		*len - offsetof (struct sockaddr, sa_family));

      else

	addr->sa_family = family;

    }

  return 0;

}

weak_alias (__getpeername, getpeername)