320 lines
7.0 KiB
C
320 lines
7.0 KiB
C
/* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <net/if.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <bits/libc-lock.h>
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#include "kernel-features.h"
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/* Variable to signal whether SIOCGIFCONF is not available. */
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#if __ASSUME_SIOCGIFNAME == 0
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static int old_siocgifconf;
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#else
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# define old_siocgifconf 0
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#endif
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unsigned int
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if_nametoindex (const char *ifname)
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{
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#ifndef SIOCGIFINDEX
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__set_errno (ENOSYS);
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return 0;
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#else
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struct ifreq ifr;
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int fd = __opensock ();
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if (fd < 0)
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return 0;
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strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
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if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0)
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{
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int saved_errno = errno;
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__close (fd);
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if (saved_errno == EINVAL)
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__set_errno (ENOSYS);
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return 0;
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}
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__close (fd);
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return ifr.ifr_ifindex;
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#endif
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}
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void
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if_freenameindex (struct if_nameindex *ifn)
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{
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struct if_nameindex *ptr = ifn;
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while (ptr->if_name || ptr->if_index)
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{
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if (ptr->if_name)
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free (ptr->if_name);
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++ptr;
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}
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free (ifn);
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}
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struct if_nameindex *
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if_nameindex (void)
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{
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#ifndef SIOCGIFINDEX
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__set_errno (ENOSYS);
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return NULL;
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#else
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int fd = __opensock ();
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struct ifconf ifc;
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unsigned int nifs, i;
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int rq_len;
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struct if_nameindex *idx = NULL;
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# define RQ_IFS 4
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if (fd < 0)
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return NULL;
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ifc.ifc_buf = NULL;
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/* We may be able to get the needed buffer size directly, rather than
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guessing. */
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if (! old_siocgifconf)
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{
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ifc.ifc_buf = NULL;
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ifc.ifc_len = 0;
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if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0 || ifc.ifc_len == 0)
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{
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# if __ASSUME_SIOCGIFNAME == 0
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old_siocgifconf = 1;
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# endif
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rq_len = RQ_IFS * sizeof (struct ifreq);
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}
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else
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rq_len = ifc.ifc_len;
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}
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else
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rq_len = RQ_IFS * sizeof (struct ifreq);
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/* Read all the interfaces out of the kernel. */
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do
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{
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ifc.ifc_buf = alloca (ifc.ifc_len = rq_len);
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if (ifc.ifc_buf == NULL || __ioctl (fd, SIOCGIFCONF, &ifc) < 0)
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{
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__close (fd);
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return NULL;
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}
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rq_len *= 2;
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}
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while (ifc.ifc_len == rq_len && old_siocgifconf);
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nifs = ifc.ifc_len / sizeof (struct ifreq);
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idx = malloc ((nifs + 1) * sizeof (struct if_nameindex));
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if (idx == NULL)
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{
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__close (fd);
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__set_errno (ENOBUFS);
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return NULL;
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}
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for (i = 0; i < nifs; ++i)
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{
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struct ifreq *ifr = &ifc.ifc_req[i];
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idx[i].if_name = __strdup (ifr->ifr_name);
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if (idx[i].if_name == NULL
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|| __ioctl (fd, SIOCGIFINDEX, ifr) < 0)
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{
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int saved_errno = errno;
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unsigned int j;
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for (j = 0; j < i; ++j)
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free (idx[j].if_name);
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free (idx);
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__close (fd);
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if (saved_errno == EINVAL)
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saved_errno = ENOSYS;
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else if (saved_errno == ENOMEM)
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saved_errno = ENOBUFS;
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__set_errno (saved_errno);
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return NULL;
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}
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idx[i].if_index = ifr->ifr_ifindex;
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}
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idx[i].if_index = 0;
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idx[i].if_name = NULL;
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__close (fd);
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return idx;
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#endif
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}
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char *
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if_indextoname (unsigned int ifindex, char *ifname)
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{
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#if !defined SIOCGIFINDEX && __ASSUME_SIOCGIFNAME == 0
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__set_errno (ENOSYS);
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return NULL;
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#else
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# if __ASSUME_SIOCGIFNAME == 0
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struct if_nameindex *idx;
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struct if_nameindex *p;
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char *result = NULL;
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# endif
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# if defined SIOCGIFNAME || __ASSUME_SIOCGIFNAME > 0
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/* We may be able to do the conversion directly, rather than searching a
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list. This ioctl is not present in kernels before version 2.1.50. */
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struct ifreq ifr;
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int fd;
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# if __ASSUME_SIOCGIFNAME == 0
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static int siocgifname_works_not;
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if (!siocgifname_works_not)
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# endif
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{
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# if __ASSUME_SIOCGIFNAME == 0
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int serrno = errno;
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# endif
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int status;
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fd = __opensock ();
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if (fd < 0)
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return NULL;
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ifr.ifr_ifindex = ifindex;
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status = __ioctl (fd, SIOCGIFNAME, &ifr);
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__close (fd);
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# if __ASSUME_SIOCGIFNAME == 0
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if (status < 0)
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{
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if (errno == EINVAL)
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siocgifname_works_not = 1; /* Don't make the same mistake twice. */
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}
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else
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return strncpy (ifname, ifr.ifr_name, IFNAMSIZ);
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__set_errno (serrno);
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# else
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return status < 0 ? NULL : strncpy (ifname, ifr.ifr_name, IFNAMSIZ);
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# endif
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}
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# endif
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# if __ASSUME_SIOCGIFNAME == 0
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idx = if_nameindex ();
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if (idx != NULL)
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{
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for (p = idx; p->if_index || p->if_name; ++p)
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if (p->if_index == ifindex)
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{
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result = strncpy (ifname, p->if_name, IFNAMSIZ);
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break;
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}
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if_freenameindex (idx);
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}
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return result;
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# endif
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#endif
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}
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#if 0
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void
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internal_function
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__protocol_available (int *have_inet, int *have_inet6)
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{
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int fd = __opensock ();
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unsigned int nifs;
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int rq_len;
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struct ifconf ifc;
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# define RQ_IFS 4
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/* Wirst case assumption. */
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*have_inet = 0;
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*have_inet6 = 0;
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if (fd < 0)
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/* We cannot open the socket. No networking at all? */
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return;
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/* We may be able to get the needed buffer size directly, rather than
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guessing. */
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if (! old_siocgifconf)
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{
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ifc.ifc_buf = NULL;
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ifc.ifc_len = 0;
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if (__ioctl (fd, SIOCGIFCONF, &ifc) < 0 || ifc.ifc_len == 0)
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{
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# if __ASSUME_SIOCGIFNAME == 0
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old_siocgifconf = 1;
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# endif
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rq_len = RQ_IFS * sizeof (struct ifreq);
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}
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else
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rq_len = ifc.ifc_len;
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}
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else
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rq_len = RQ_IFS * sizeof (struct ifreq);
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/* Read all the interfaces out of the kernel. */
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do
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{
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ifc.ifc_buf = alloca (ifc.ifc_len = rq_len);
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if (ifc.ifc_buf == NULL || __ioctl (fd, SIOCGIFCONF, &ifc) < 0)
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{
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__close (fd);
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return;
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}
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rq_len *= 2;
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}
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while (ifc.ifc_len == rq_len && old_siocgifconf);
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nifs = ifc.ifc_len / sizeof (struct ifreq);
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/* Go through all the interfaces and get the address. */
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while (nifs-- > 0)
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if (__ioctl (fd, SIOCGIFADDR, &ifc.ifc_req[nifs]) >= 0)
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{
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/* We successfully got information about this interface. Now
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test whether it is an IPv4 or IPv6 address. */
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if (ifc.ifc_req[nifs].ifr_addr.sa_family == AF_INET)
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*have_inet = 1;
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else if (ifc.ifc_req[nifs].ifr_addr.sa_family == AF_INET6)
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*have_inet6 = 1;
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/* Note, this is & not &&. It works since the values are always
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0 or 1. */
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if (*have_inet & *have_inet6)
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/* We can stop early. */
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break;
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}
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__close (fd);
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}
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#endif
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