40 lines
999 B
Text
40 lines
999 B
Text
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dnl Check to find out whether the running kernel has support for TUN/TAP
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AC_DEFUN(tinc_TUNTAP,
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[
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AC_ARG_WITH(kernel,
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[ --with-kernel=dir give the directory with kernel sources]
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[ (default: /usr/src/linux)],
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kerneldir="$withval",
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kerneldir="/usr/src/linux"
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)
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AC_CACHE_CHECK([for linux/if_tun.h], tinc_cv_linux_if_tun_h,
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[
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AC_TRY_COMPILE([#include "$kerneldir/include/linux/if_tun.h"],
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[int a = IFF_TAP;],
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if_tun_h="\"$kerneldir/include/linux/if_tun.h\"",
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[AC_TRY_COMPILE([#include <linux/if_tun.h>],
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[int a = IFF_TAP;],
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if_tun_h="default",
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if_tun_h="no"
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)]
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)
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if test $if_tun_h = no; then
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tinc_cv_linux_if_tun_h=none
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else
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tinc_cv_linux_if_tun_h="$if_tun_h"
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fi
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])
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if test $tinc_cv_linux_if_tun_h != none; then
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AC_DEFINE(HAVE_TUNTAP)
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if test $tinc_cv_linux_if_tun_h != default; then
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AC_DEFINE_UNQUOTED(LINUX_IF_TUN_H, $tinc_cv_linux_if_tun_h)
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fi
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fi
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AC_SUBST(LINUX_IF_TUN_H)
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AC_SUBST(HAVE_TUNTAP)
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])
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