dnl aclocal.m4 generated automatically by aclocal 1.4

dnl Copyright (C) 1994, 1995-8, 1999 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY, to the extent permitted by law; without
dnl even the implied warranty of MERCHANTABILITY or FITNESS FOR A
dnl PARTICULAR PURPOSE.

dnl $Id: aclocal.m4,v 1.1.1.1 2000/05/25 00:28:49 route Exp $
dnl
dnl Libnet specific autoconf macros
dnl Copyright (c) 1998, 1999, 2000 Mike D. Schiffman <mike@infonexus.com>
dnl All rights reserved.
dnl

dnl
dnl Checks to see if this linux kernel has a working PF_PACKET
dnl
dnl usage:
dnl
dnl     AC_LIBNET_CHECK_PF_PACKET
dnl
dnl results:
dnl
dnl     HAVE_PF_PACKET (DEFINED)
dnl

AC_DEFUN(AC_LIBNET_CHECK_PF_PACKET,
[
    AC_MSG_CHECKING(for PF_PACKET)
    AC_CACHE_VAL(ac_libnet_have_pf_packet,

        [case "$target_os" in

        linux)
                ac_libnet_have_pf_packet = no
                ;;
        *)

    cat > pf_packet-test.c << EOF
#include <net/if.h>
#if (__GLIBC__)
#include <netinet/if_ether.h>
#include <net/if_arp.h>
#else
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#endif
#if (PF_PACKET)
#ifndef SOL_PACKET
#define SOL_PACKET 263
#endif  /* SOL_PACKET */
#include <linux/if_packet.h>
#endif
#include <stdlib.h>
#include <linux/sockios.h>

int
main()
{
#if (PF_PACKET)
    int fd;
    struct sockaddr_ll sa;
    struct ifreq ifr;
    struct packet_mreq mr;
    char *device ="lo";

    fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
    if (fd == -1)
    {
        printf("choked");
        exit (EXIT_FAILURE);
    }

    memset(&sa, 0, sizeof(sa));
    strcpy(ifr.ifr_name, device);
    if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0)
    {
        printf("choked");
        exit (EXIT_FAILURE);
    }
    sa.sll_family = AF_PACKET;
    sa.sll_ifindex = ifr.ifr_ifindex;
    sa.sll_protocol = htons(ETH_P_ALL);

    memset(&mr, 0, sizeof (mr));
    mr.mr_ifindex = sa.sll_ifindex;
    mr.mr_type = PACKET_MR_ALLMULTI;

    if (setsockopt(fd, SOL_PACKET, PACKET_ADD_MEMBERSHIP, (char *)&mr,
            sizeof (mr)) < 0)
    {
        printf("choked\n");
        exit (EXIT_FAILURE);
    }
    /* yay.  we made it and it workz! */
    printf("yes");
#else   /* PF_PACKET */
    printf("no");
#endif
    exit (EXIT_SUCCESS);
}
EOF
    ${CC-cc} -o pf_packet-test $CFLAGS pf_packet-test.c >/dev/null 2>&1

    # Oopz 4.3 BSD doesn't have this.  Sorry.
    if test ! -x ./pf_packet-test ; then
        ac_libnet_have_pf_packet=choked
    else
        ac_libnet_have_pf_packet=`./pf_packet-test`;
    fi

    if test $ac_libnet_have_pf_packet = choked; then
        AC_MSG_RESULT(test program choked... assuming no)
    elif test $ac_libnet_have_pf_packet = yes; then
        AC_DEFINE(HAVE_PF_PACKET)
        LIBNET_CONFIG_DEFINES="$LIBNET_CONFIG_DEFINES -DHAVE_PF_PACKET"
    fi

    if test $ac_libnet_have_pf_packet != choked; then
        AC_MSG_RESULT($ac_libnet_have_pf_packet)
    fi
    rm -f pf_packet-test* core core.pf_packet-test
    ;;
    esac])
])

dnl
dnl Looks for a previous libnet version and attempts to determine which verion
dnl it is.  Version 0.8 was the first version that actually knew internally
dnl what version it was.
dnl
dnl usage:
dnl
dnl     AC_LIBNET_CHECK_LIBNET_VERSION
dnl
dnl results:
dnl
dnl
dnl

AC_DEFUN(AC_LIBNET_CHECK_LIBNET_VER,
[
    AC_CHECK_LIB(net, libnet_build_ip, AC_MSG_CHECKING(version) \

changequote(<<, >>)dnl
    if [[ ! -f $LIB_PREFIX/libnet.a ]] ; then
changequote([, ])dnl
        AC_MSG_RESULT($LIB_PREFIX/libnet.a doesn't exist)
        AC_MSG_RESULT(previous libnet install lives elsewhere, you should probably find it)
    else
        __LIBNET_VERSION=`strings $LIB_PREFIX/libnet.a | grep "libnet version"\
                | cut -f3 -d" "`;\
        if test -z "$__LIBNET_VERSION"; then
            AC_MSG_RESULT(<0.8)
        else
            AC_MSG_RESULT($__LIBNET_VERSION)
        fi
    fi\
    )
])


dnl
dnl Checks to see if this linux kernel uses ip_sum or ip_csum
dnl (Pulled from queso)
dnl
dnl usage:
dnl
dnl     AC_LIBNET_CHECK_IP_CSUM
dnl
dnl results:
dnl
dnl     HAVE_STRUCT_IP_CSUM (DEFINED)
dnl

AC_DEFUN(AC_LIBNET_CHECK_IP_CSUM,
[
    AC_MSG_CHECKING([struct ip contains ip_csum])
    AC_TRY_COMPILE([
        #define __BSD_SOURCE
        #define _BSD_SOURCE
        #include <sys/types.h>
        #include <netinet/in.h>
        #include <netinet/in_systm.h>
        #include <netinet/ip.h>],
        [
            struct ip ip;
            ip.ip_csum = 0;
        ],
        [AC_MSG_RESULT(yes);
        AC_DEFINE(HAVE_STRUCT_IP_CSUM)],
        [AC_MSG_RESULT(no);
    ])
])

dnl
dnl Checks to see if unaligned memory accesses fail
dnl (Pulled from libpcap)
dnl
dnl usage:
dnl
dnl     AC_LBL_UNALIGNED_ACCESS
dnl
dnl results:
dnl
dnl     LBL_ALIGN (DEFINED)
dnl

AC_DEFUN(AC_LBL_UNALIGNED_ACCESS,
    [AC_MSG_CHECKING(if unaligned accesses fail)
    AC_CACHE_VAL(ac_cv_lbl_unaligned_fail,
        [case "$target_cpu" in

        alpha|hp*|mips|sparc)
                ac_cv_lbl_unaligned_fail=yes
                ;;

        *)
                cat >conftest.c <<EOF
#                   include <sys/types.h>
#                   include <sys/wait.h>
#                   include <stdio.h>
                    unsigned char a[[5]] = { 1, 2, 3, 4, 5 };
                    main()
                    {
                        unsigned int i;
                        pid_t pid;
                        int status;
                        /* avoid "core dumped" message */
                        pid = fork();
                        if (pid <  0)
                        {
                            exit(2);
                        }
                        if (pid > 0)
                        {
                            /* parent */
                            pid = waitpid(pid, &status, 0);
                            if (pid < 0)
                            {
                                exit(3);
                            }
                            exit(!WIFEXITED(status));
                        }
                        /* child */
                        i = *(unsigned int *)&a[[1]];
                        printf("%d\n", i);
                        exit(0);
                    }
EOF
                ${CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS \
                    conftest.c $LIBS > /dev/null 2>&1
                # Oopz 4.3 BSD doesn't have this.  Sorry.
                if test ! -x conftest ; then
                        dnl failed to compile for some reason
                        ac_cv_lbl_unaligned_fail=yes
                else
                        ./conftest > conftest.out
                        if test ! -s conftest.out ; then
                                ac_cv_lbl_unaligned_fail=yes
                        else
                                ac_cv_lbl_unaligned_fail=no
                        fi
                fi
                rm -f conftest* core core.conftest
                ;;
        esac])
    AC_MSG_RESULT($ac_cv_lbl_unaligned_fail)
    if test $ac_cv_lbl_unaligned_fail = yes ; then
            AC_DEFINE(LBL_ALIGN)
    fi
])


dnl
dnl Checks endianess
dnl
dnl usage:
dnl
dnl     AC_LIBNET_ENDIAN_CHECK
dnl
dnl results:
dnl
dnl     LIBNET_BIG_ENDIAN = 1   or
dnl     LIBNET_LIL_ENDIAN = 1
dnl

AC_DEFUN(AC_LIBNET_ENDIAN_CHECK,
    [AC_MSG_CHECKING(machine endianess)

    cat > conftest.c << EOF
#       include <stdio.h>
#       include <stdlib.h>

        int main()
        {
            union
            {
                short s;
                char c[[sizeof(short)]];
            } un;

            un.s = 0x0102;
            if (sizeof (short) == 2)
            {
                if (un.c [[0]] == 1 && un.c [[1]] == 2)
                {
                    printf("B\n");
                }
                else
                {
                    if (un.c [[0]] == 2 && un.c [[1]] == 1)
                    {
                        printf("L\n");
                    }
                }
            }
            else
            {
                printf("?\n");
            }
            return (EXIT_SUCCESS);
        }
EOF
        ${CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS conftest.c $LIBS > /dev/null 2>&1
        # Oopz 4.3 BSD doesn't have this.  Sorry.
        if test ! -x conftest ; then
dnl failed to compile for some reason
            ac_cv_libnet_endianess=unknown
        else
            ./conftest > conftest.out
            result=`cat conftest.out`
            if test $result = "B"; then
                ac_cv_libnet_endianess=big
            elif test $result = "L"; then
                ac_cv_libnet_endianess=lil
            else
                ac_cv_libnet_endianess=unknown
            fi                                
        fi
        rm -f conftest* core core.conftest

        AC_MSG_RESULT($ac_cv_libnet_endianess)

        if test $ac_cv_libnet_endianess = big ; then
            AC_DEFINE(LIBNET_BIG_ENDIAN)
        LIBNET_CONFIG_DEFINES="$LIBNET_CONFIG_DEFINES -DLIBNET_BIG_ENDIAN"
        elif test $ac_cv_libnet_endianess = lil ; then
            AC_DEFINE(LIBNET_LIL_ENDIAN)
        LIBNET_CONFIG_DEFINES="$LIBNET_CONFIG_DEFINES -DLIBNET_LIL_ENDIAN"
        fi
    ])

