sysdeps/mach/hurd/if_index.c

   1 /* Find network interface names and index numbers.  Hurd version.
   2    Copyright (C) 2000,01,02 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <error.h>
  21 #include <net/if.h>
  22 #include <string.h>
  23 #include <sys/ioctl.h>
  24 #include <unistd.h>
  25
  26 #include <hurd.h>
  27 #include <hurd/ioctl.h>
  28 #include <hurd/pfinet.h>
  29
  30 /* Return the interface index corresponding to interface IFNAME.
  31    On error, return 0.  */
  32 unsigned int
  33 if_nametoindex (const char *ifname)
  34 {
  35   struct ifreq ifr;
  36   int fd = __opensock ();
  37
  38   if (fd < 0)
  39     return 0;
  40
  41   strncpy (ifr.ifr_name, ifname, IFNAMSIZ);
  42   if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0)
  43     {
  44       int saved_errno = errno;
  45       __close (fd);
  46       if (saved_errno == EINVAL || saved_errno == ENOTTY)
  47         __set_errno (ENOSYS);
  48       return 0;
  49     }
  50   __close (fd);
  51   return ifr.ifr_ifindex;
  52 }
  53 libc_hidden_def (if_nametoindex)
  54
  55 /* Free the structure IFN returned by if_nameindex.  */
  56 void
  57 if_freenameindex (struct if_nameindex *ifn)
  58 {
  59   struct if_nameindex *ptr = ifn;
  60   while (ptr->if_name || ptr->if_index)
  61     {
  62       if (ptr->if_name)
  63         free (ptr->if_name);
  64       ++ptr;
  65     }
  66   free (ifn);
  67 }
  68
  69 /* Return an array of if_nameindex structures, one for each network
  70    interface present, plus one indicating the end of the array.  On
  71    error, return NULL.  */
  72 struct if_nameindex *
  73 if_nameindex (void)
  74 {
  75   error_t err = 0;
  76   char data[2048];
  77   file_t server;
  78   int fd = __opensock ();
  79   struct ifconf ifc;
  80   unsigned int nifs, i;
  81   struct if_nameindex *idx = NULL;
  82
  83   ifc.ifc_buf = data;
  84
  85   if (fd < 0)
  86     return NULL;
  87
  88   server = _hurd_socket_server (PF_INET, 0);
  89   if (server == MACH_PORT_NULL)
  90     nifs = 0;
  91   else
  92     {
  93       size_t len = sizeof data;
  94       err = __pfinet_siocgifconf (server, -1, &ifc.ifc_buf, &len);
  95       if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED)
  96         {
  97           /* On the first use of the socket server during the operation,
  98              allow for the old server port dying.  */
  99           server = _hurd_socket_server (PF_INET, 1);
 100           if (server == MACH_PORT_NULL)
 101             goto out;
 102           err = __pfinet_siocgifconf (server, -1, &ifc.ifc_buf, &len);
 103         }
 104       if (err)
 105         goto out;
 106
 107       ifc.ifc_len = len;
 108       nifs = len / sizeof (struct ifreq);
 109     }
 110
 111   idx = malloc ((nifs + 1) * sizeof (struct if_nameindex));
 112   if (idx == NULL)
 113     {
 114       err = ENOBUFS;
 115       goto out;
 116     }
 117
 118   for (i = 0; i < nifs; ++i)
 119     {
 120       struct ifreq *ifr = &ifc.ifc_req[i];
 121       idx[i].if_name = __strdup (ifr->ifr_name);
 122       if (idx[i].if_name == NULL
 123           || __ioctl (fd, SIOCGIFINDEX, ifr) < 0)
 124         {
 125           unsigned int j;
 126           err = errno;
 127
 128           for (j =  0; j < i; ++j)
 129             free (idx[j].if_name);
 130           free (idx);
 131           idx = NULL;
 132
 133           if (err == EINVAL)
 134             err = ENOSYS;
 135           else if (err == ENOMEM)
 136             err = ENOBUFS;
 137           goto out;
 138         }
 139       idx[i].if_index = ifr->ifr_ifindex;
 140     }
 141
 142   idx[i].if_index = 0;
 143   idx[i].if_name = NULL;
 144
 145  out:
 146   __close (fd);
 147   if (data != ifc.ifc_buf)
 148     __vm_deallocate (__mach_task_self (), (vm_address_t) ifc.ifc_buf,
 149                      ifc.ifc_len);
 150   __set_errno (err);
 151   return idx;
 152 }
 153
 154 /* Store the name of the interface corresponding to index IFINDEX in
 155    IFNAME (which has space for at least IFNAMSIZ characters).  Return
 156    IFNAME, or NULL on error.  */
 157 char *
 158 if_indextoname (unsigned int ifindex, char *ifname)
 159 {
 160   struct ifreq ifr;
 161   int fd = __opensock ();
 162
 163   if (fd < 0)
 164     return NULL;
 165
 166   ifr.ifr_ifindex = ifindex;
 167   if (__ioctl (fd, SIOCGIFNAME, &ifr) < 0)
 168     {
 169       int saved_errno = errno;
 170       __close (fd);
 171       if (saved_errno == EINVAL || saved_errno == ENOTTY)
 172         __set_errno (ENOSYS);
 173       else if (saved_errno == ENODEV)
 174         __set_errno (ENXIO);
 175       return NULL;
 176     }
 177   __close (fd);
 178   return strncpy (ifname, ifr.ifr_name, IFNAMSIZ);
 179 }
 180 libc_hidden_def (if_indextoname)
 181
 182 #if 0
 183 void
 184 internal_function
 185 __protocol_available (int *have_inet, int *have_inet6)
 186 {
 187   *have_inet = _hurd_socket_server (PF_INET, 0) != MACH_PORT_NULL;
 188   *have_inet6 = _hurd_socket_server (PF_INET6, 0) != MACH_PORT_NULL;
 189 }
 190 #endif