44 lines
1.2 KiB
Text
44 lines
1.2 KiB
Text
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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AS_HELP_STRING([--with-kernel=DIR], [give the directory with kernel sources (default: /usr/src/linux)]),
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kerneldir="$withval",
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kerneldir="/usr/src/linux"
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)
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AC_CACHE_CHECK([for linux/if_tun.h], tinc_cv_linux_if_tun_h,
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[
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AC_COMPILE_IFELSE(
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AC_LANG_PROGRAM([
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#include "$kerneldir/include/linux/if_tun.h"
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int a = IFF_TAP;
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]),
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[if_tun_h="\"$kerneldir/include/linux/if_tun.h\""],
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[AC_COMPILE_IFELSE(
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AC_LANG_PROGRAM([
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#include <linux/if_tun.h>
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int a = IFF_TAP;
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]),
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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, 1, [Universal tun/tap driver present])
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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, [Location of 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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