#!/bin/sh

show_help()
{
	echo configure help:
	echo "--help                  show this help"
	echo "--force-libpcap         build a libpcap based binary under linux"
	echo "                        even if uid != euid"
}

if [ "$1" = "--help" ]; then
	show_help
	exit 0
fi

CC=${CC:=cc}

echo build byteorder.c...
$CC byteorder.c -o byteorder || exit 1

INSTALL_MANPATH=`echo $MANPATH|cut -f1 -d:`
if [ "$INSTALL_MANPATH" = "" ]; then
	INSTALL_MANPATH="/usr/local/man"
fi
BYTEORDER=`./byteorder -m`

echo create byteorder.h...
cat > byteorder.h <<EOF
#ifndef __BYTEORDER_H
#define __BYTEORDER_H

EOF
echo \#ifndef $BYTEORDER >> byteorder.h
echo \#define $BYTEORDER >> byteorder.h
echo \#endif /\* $BYTEORDER \*/ >> byteorder.h
cat >> byteorder.h <<EOF

#endif /* __BYTEORDER_H */
EOF

CONFIGOSTYPE=`uname -s | tr [a-z] [A-Z]`
if [ ! "$CONFIGOSTYPE" ]; then
	CONFIGOSTYPE=UNKNOWN
fi

# for BSD/OS use the historical name as it doesn't include '/'
if [  $CONFIGOSTYPE = "BSD/OS" ]; then
	CONFIGOSTYPE=BSDI
fi

case $CONFIGOSTYPE in
  SUNOS)
    SOLARISLIB="-lsocket -lresolv -lnsl"
    BUG='/* #define STUPID_SOLARIS_CHECKSUM_BUG */'
    case `uname -r` in
      2.0*|5.0*|2.1*|5.1*|2.2*|5.2*|2.3*|5.3*|2.4*|5.4*|5.5.1)
               BUG='#define STUPID_SOLARIS_CHECKSUM_BUG' ;;
    esac
esac

#
# configurable stuff
#
FORCE_LIBPCAP=""
if [ "$CONFIGOSTYPE" = "LINUX" ]; then
	PCAP=""
	PCAP_INCLUDE=""
else
	PCAP="PCAP=-lpcap"
	PCAP_INCLUDE=""
fi

for ARG in $*; do
	case "$ARG" in
		*"--force-libpcap")
			FORCE_LIBPCAP="-DFORCE_LIBPCAP"
			PCAP="PCAP=-lpcap"
			PCAP_INCLUDE=""
			;;
	esac
done

echo --------------------------------------
echo system type: $CONFIGOSTYPE
echo
echo "FORCE_LIBPCAP: $FORCE_LIBPCAP"
echo "LIBPCAP      : $PCAP"
echo "PCAP_INCLUDE : $PCAP_INCLUDE"
echo "MANPATH      : $INSTALL_MANPATH"
echo
echo "(to modify try configure --help)"
echo --------------------------------------

echo creating Makefile...
sed	-e "s/@FORCE_LIBPCAP@/$FORCE_LIBPCAP/g" \
	-e "s^@PCAP@^$PCAP^g" \
	-e "s^@PCAP_INCLUDE@^$PCAP_INCLUDE^g" \
	-e "s^@MANPATH@^$INSTALL_MANPATH^g" \
	-e "s^@SOLARISLIB@^$SOLARISLIB^g" \
	-e "s^@CFLAGS@^$CFLAGS^g" \
	<Makefile.in > Makefile

#
#
#

cat > systype.h <<EOF
#ifndef __SYSTYPE_H
#define __SYSTYPE_H

EOF
echo \#define OSTYPE_${CONFIGOSTYPE} >> systype.h
cat >> systype.h <<EOF

#endif /* SYSTYPE_H */
EOF

echo now you can try \`make\'