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6938e63f71
Grok AF_LINK if defined. From Momchil Velikov <velco@fadata.bg>. * sysdeps/gnu/ifaddrs.c (getifaddrs): If ioctl fails for netmask, brdaddr, or dstaddr, just set those pointers to null and don't fail. Reported by Momchil Velikov <velco@fadata.bg>. * sysdeps/generic/ifreq.h (__if_nextreq) [_HAVE_SA_LEN]: If sa_len is > sizeof IFR->ifa_addr, advance past the whole longer length. (__ifreq): Count up NIFS that way too. Reported by Momchil Velikov <velco@fadata.bg>. * sysdeps/mach/hurd/lchmod.c: Include <fcntl.h>.
102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/* Copyright (C) 1999,2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Jaeger <aj@suse.de>.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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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static inline struct ifreq *
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__if_nextreq (struct ifreq *ifr)
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{
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#ifdef _HAVE_SA_LEN
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if (ifr->ifa_addr > sizeof ifr->ifa_addr)
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return (struct ifreq *) ((char *) &ifr->ifa_addr + ifr->ifa_addr.sa_len);
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#endif
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return ifr + 1;
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}
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static inline void
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__ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
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{
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int fd = sockfd;
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struct ifconf ifc;
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int rq_len;
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int nifs;
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# define RQ_IFS 4
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if (fd < 0)
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fd = __opensock ();
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if (fd < 0)
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{
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*num_ifs = 0;
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*ifreqs = NULL;
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return;
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}
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ifc.ifc_buf = NULL;
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rq_len = RQ_IFS * sizeof (struct ifreq) / 2; /* Doubled in the loop. */
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do
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{
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ifc.ifc_len = rq_len *= 2;
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ifc.ifc_buf = realloc (ifc.ifc_buf, ifc.ifc_len);
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if (ifc.ifc_buf == NULL || __ioctl (fd, SIOCGIFCONF, &ifc) < 0)
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{
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if (ifc.ifc_buf)
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free (ifc.ifc_buf);
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if (fd != sockfd)
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__close (fd);
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*num_ifs = 0;
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*ifreqs = NULL;
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return;
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}
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}
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while (rq_len < sizeof (struct ifreq) + ifc.ifc_len);
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if (fd != sockfd)
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__close (fd);
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#ifdef _HAVE_SA_LEN
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struct ifreq *ifr = ifreqs;
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nifs = 0;
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while ((char *) ifr < ifc.ifc_buf + ifc.ifc_len)
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{
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++nifs;
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ifr = __if_nextreq (ifr);
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if (ifr == NULL)
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break;
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}
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#else
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nifs = ifc.ifc_len / sizeof (struct ifreq);
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#endif
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*num_ifs = nifs;
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*ifreqs = realloc (ifc.ifc_buf, nifs * sizeof (struct ifreq));
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}
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static inline void
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__if_freereq (struct ifreq *ifreqs, int num_ifs)
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{
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free (ifreqs);
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}
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