sysdeps/mach/hurd/getpeername.c

   1 /* Copyright (C) 1992,1994,1997,1999,2000,2005 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <string.h>
  21 #include <sys/socket.h>
  22
  23 #include <hurd.h>
  24 #include <hurd/fd.h>
  25 #include <hurd/socket.h>
  26
  27 /* Put the address of the peer connected to socket FD into *ADDR
  28    (which is *LEN bytes long), and its actual length into *LEN.  */
  29 int
  30 __getpeername (int fd, __SOCKADDR_ARG addrarg, socklen_t *len)
  31 {
  32   error_t err;
  33   mach_msg_type_number_t buflen = *len;
  34   int type;
  35   struct sockaddr *addr = addrarg.__sockaddr__;
  36   char *buf = (char *) addr;
  37   addr_port_t aport;
  38
  39   if (err = HURD_DPORT_USE (fd, __socket_peername (port, &aport)))
  40     return __hurd_dfail (fd, err);
  41
  42   err = __socket_whatis_address (aport, &type, &buf, &buflen);
  43   __mach_port_deallocate (__mach_task_self (), aport);
  44
  45   if (err)
  46     return __hurd_dfail (fd, err);
  47
  48   if (*len > buflen)
  49     *len = buflen;
  50
  51   if (buf != (char *) addr)
  52     {
  53       memcpy (addr, buf, *len);
  54       __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
  55     }
  56
  57   const sa_family_t family = type;
  58   if (*len > offsetof (struct sockaddr, sa_family))
  59     {
  60       if (*len < (char *) (&addr->sa_family + 1) - (char *) addr)
  61         memcpy (&addr->sa_family, &family,
  62                 *len - offsetof (struct sockaddr, sa_family));
  63       else
  64         addr->sa_family = family;
  65     }
  66
  67   return 0;
  68 }
  69
  70 weak_alias (__getpeername, getpeername)