dnl
dnl $Id: configure.in,v 1.1 1999/09/13 18:50:46 jpr5 Exp $
dnl

AC_INIT(ngrep.c)

AC_CANONICAL_SYSTEM

AC_PROG_CC
AC_PREFIX(gcc)


AC_HEADER_STDC
AC_CHECK_HEADER(strings.h,,echo need strings header; exit)
AC_CHECK_HEADER(netinet/if_ether.h,AC_DEFINE(HAVE_IF_ETHER_H,1),)


mustcheck=""

AC_CHECK_HEADER(net/bpf.h,
   AC_MSG_CHECKING(for usable bpf.h)
   AC_TRY_COMPILE(,
#include <net/bpf.h>
int main(void) {
    int foo = DLT_RAW;
}
      ,echo yes, 
echo nope
echo '***************************************************************'
echo an important define is missing from the bpf.h I found.  this
echo probably means that your installation of pcap is outdated and
echo needs upgrading.  I\'ll go ahead and add the define for you but
echo understand that matching certain types of packets may not 
echo function properly.
echo '***************************************************************'
sleep 2
AC_DEFINE(DLT_RAW,12)
)
   AC_CHECK_HEADER(pcap.h,,mustcheck="1"),
   mustcheck="1")

if test -n "$mustcheck"; then
  AC_MSG_CHECKING(for a complete set of pcap headers)
  possible_dirs="/usr/include /usr/include/pcap \
                 /usr/local/include /usr/local/include/pcap \
                 /usr/share/include /usr/share/include/pcap"
  pcap_dir=""

  for dir in $possible_dirs ; do 
      if test -d $dir -a -r "$dir/pcap.h" -a \
                         -r "$dir/net/bpf.h" ; then 
         if test -n "$pcap_dir" ; then
            echo 
            echo; echo more than one set found in:
	    echo  $pcap_dir 
	    echo  $dir
            echo; echo please wipe out all unused pcap installations
            exit
         else 
            pcap_dir="$dir"
         fi
      fi
  done

  if test -z "$pcap_dir" ; then
     echo no; echo couldn\'t find a complete set
     exit
  else
     AC_SUBST(PCAP_INCLUDE)
     PCAP_INCLUDE="-I$pcap_dir"
     echo found $pcap_dir
     
     AC_MSG_CHECKING(for usable bpf.h)
     if test -n "`grep DLT_RAW $pcap_dir/net/bpf.h`" ; then
	echo yep
     else 
echo nope
echo '***************************************************************'
echo an important define is missing from the bpf.h I found.  this
echo probably means that your installation of pcap is outdated and
echo needs upgrading.  I\'ll go ahead and add the define for you but
echo understand that matching certain types of packets may not 
echo function properly.
echo '***************************************************************'
sleep 2
AC_DEFINE(DLT_RAW,12)
     fi
  fi
fi


AC_C_CONST
AC_TYPE_SIZE_T
AC_TYPE_SIGNAL
AC_FUNC_ALLOCA


AC_DEFINE(_BSD_SOURCE)
AC_DEFINE(__FAVOR_BSD)

case "$target_os" in

*linux*)
	AC_DEFINE(LINUX)

	AC_MSG_CHECKING(for a dumb udphdr declaration)
	AC_TRY_COMPILE(,
#ifndef __FAVOR_BSD
#define __FAVOR_BSD
#endif

#ifndef _BSD_SOURCE
#define _BSD_SOURCE 1
#endif

#include <netinet/udp.h>

struct udphdr foo;
unsigned short bar = foo.uh_sport;
,
	echo nope,
        echo yep dumb; AC_DEFINE(HAVE_DUMB_UDPHDR))

        ;;

*bsd*)
	AC_DEFINE(BSD)

        ;;

*solaris*)
	AC_DEFINE(SOLARIS)

        AC_CHECK_LIB(socket, socket,,
                     echo no socket in -lsocket\?; exit)
        AC_CHECK_LIB(nsl, gethostbyname,,
                     echo no gethostbyname in -lnsl\?; exit)

	LIBS="$LIBS -lnsl -lsocket"

        AC_SUBST(EXTRA_LIBS)
	EXTRA_LIBS='-lnsl -lsocket'

	;;

*)
        AC_MSG_WARN(Your OS ($target_os) is not supported yet.  Who\
                    knows what will happen.)

        ;;

esac


AC_CHECK_LIB(pcap, pcap_open_live,,echo need pcap lib; exit)

AC_CHECK_LIB(pcap, pcap_restart, AC_DEFINE(PCAP_RESTART,pcap_restart),
 AC_CHECK_LIB(pcap, pcap_yyrestart, AC_DEFINE(PCAP_RESTART,pcap_yyrestart),
  AC_CHECK_LIB(pcap, yyrestart, AC_DEFINE(PCAP_RESTART,yyrestart),
   echo no yacc restart func found
   echo perhaps libpcap wasn\'t compiled with bison/flex\?
   exit)))


AC_OUTPUT(Makefile)