dnl dnl configure.in: dnl Autoconf input for iftop. dnl dnl I hate autoconf with a passion. It's an utter pain to write these bloody dnl things and even once you have you find yourself testing for more and more dnl special cases. But that's OK. Paul is going to maintain it :) dnl -- Chris Lightfoot dnl dnl $Id: configure.in,v 1.1.1.1 2012/02/21 16:57:34 misho Exp $ dnl dnl To regenerate everything from source, do: dnl autoheader dnl aclocal dnl automake dnl autoconf dnl Now you should have good sources to make into a tarball and distribute. dnl ./configure (perhaps with some arguments) dnl make dnl Tested with Automake 1.4 and autoconf 2.59. dnl dnl Boilerplate configuration dnl AC_INIT(iftop.c) AC_CONFIG_AUX_DIR(config) AC_CANONICAL_SYSTEM AM_CONFIG_HEADER(config.h) AM_INIT_AUTOMAKE(iftop, "0.17") AC_DEFINE_UNQUOTED(IFTOP_VERSION, "$VERSION", [The iftop version number]) dnl Make sure we have a C compiler.... AC_PROG_CC AC_HEADER_STDC dnl dnl Options to configure. dnl AC_ARG_WITH(resolver, [ --with-resolver=TYPE Technique iftop should use for name resolution. Valid options are: netdb use gethostbyaddr_r in multiple threads. netdb_1thread use gethostbyaddr_r and assume it is not reentrant. ares use the MIT ARES asynchronous resolver library. forking use the REALLY SUCKY forking resolver. guess run experiments to guess a reasonable value. Only works if you aren't cross-compiling. This is the default. guess will either select netdb or netdb_1thread. none don't do name resolution.], [resolver=$withval], [resolver=guess]) AC_ARG_WITH(libpcap, [ --with-libpcap=WHERE Where the libpcap packet-capture library is found. The pcap library should be installed in WHERE/lib, and the header file in either WHERE/include or WHERE/include/pcap. [default=look in standard locations]], [libpcap_prefix=$withval], [libpcap_prefix=""]) dnl dnl Fairly generic checks. dnl dnl Checks for system headers. AC_CHECK_HEADERS(sys/ioctl.h sys/time.h sys/sockio.h unistd.h) dnl Checks for typedefs, structures, and compiler characteristics. AC_C_CONST AC_TYPE_SIZE_T AC_HEADER_TIME dnl dnl Are we on a system that uses the STREAMS low-level DLPI interface? dnl AC_CHECK_HEADER([sys/dlpi.h],[AC_DEFINE([HAVE_DLPI],1,[Are we running on a STREAMS system with DLPI?])]) dnl Checks for library functions. AC_CHECK_FUNCS(regcomp select strdup strerror strspn) AC_SEARCH_LIBS(socket, socket) AC_SEARCH_LIBS(log, m) AC_CHECK_FUNC(gethostbyname, , [AC_CHECK_LIB(nsl, gethostbyname)] ) AC_SEARCH_LIBS(inet_aton, [socket nsl]) AC_SEARCH_LIBS(inet_pton, [socket nsl]) AC_CHECK_FUNCS(inet_aton inet_pton) dnl dnl Find integers of known physical size. This is a pain in the arse because dnl we can't use AC_CHECK_SIZEOF to find the original variables, since that dnl function doesn't permit us to include a header file. Sigh. dnl for type in u_int8_t u_int16_t u_int32_t ; do AC_MSG_CHECKING([size of $type]) AC_RUN_IFELSE([ #include #include int main() { $type dummy; FILE *f=fopen("conftestval", "w"); if (!f) exit(1); fprintf(f, "%d\n", sizeof($1)); exit(0); } ], [ x=`cat conftestval` eval "size_$type=$x" AC_MSG_RESULT([$x]) ], [ eval "size_$type=0" AC_MSG_RESULT([unknown type]) ], [ eval "size_$type=0" AC_MSG_RESULT([can't determine when cross-compiling]) ]) done dnl Groan. Have to do things this way so that autoheader can do its thing.... AC_DEFINE_UNQUOTED(SIZEOF_U_INT8_T, [$size_u_int8_t], [size of u_int8_t]) AC_DEFINE_UNQUOTED(SIZEOF_U_INT16_T, [$size_u_int16_t], [size of u_int16_t]) AC_DEFINE_UNQUOTED(SIZEOF_U_INT32_T, [$size_u_int32_t], [size of u_int32_t]) dnl If we already have these types, don't piss about any more.... if test $size_u_int8_t != 1 || test $size_u_int16_t != 2 || test $size_u_int32_t != 4 ; then dnl XXXif test $size_u_int8_t != 1 -o $size_u_int16_t != 2 -o $size_u_int32_t != 4 ; then do_int_types=1 AC_CHECK_HEADERS( stdint.h dnl C99 sys/inttypes.h, dnl Solaris [do_int_types=0; break]) if test $do_int_types = 1 ; then dnl No C99 int types, so figure them out from basic types. AC_CHECK_SIZEOF(unsigned short int) AC_CHECK_SIZEOF(unsigned int) AC_CHECK_SIZEOF(unsigned long int) else dnl Just use the C99 ones. AC_DEFINE(HAVE_C99_INTS, 1, [C99 fixed-width int types available]) fi fi dnl dnl Name resolution. dnl dnl This is complicated because we need some sort of reentrant mechanism for dnl name resolution. Naturally, UNIX vendors have come up with a variety of dnl incompatible schemes for this, many of which don't work at all. dnl dnl First, the default resolver, which uses getnameinfo or gethostbyaddr_r. If dnl not available, we fall back to gethostbyaddr. We could fall back to ARES, dnl but that's probably not available on typical machines. dnl If we've been asked to guess, remember that fact in specified_resolver. dnl From this point on, resolver is our preferred resolver given the dnl experiments we've done so far, or "guess" if we have no idea. specified_resolver=$resolver if test x$specified_resolver = xguess ; then dnl Best possibility is getnameinfo. use_getnameinfo=0 AC_SEARCH_LIBS(getnameinfo, [nsl], [use_getnameinfo=1]) dnl XXX For the moment, don't use getnameinfo, since it isn't actually dnl thread safe on, e.g., NetBSD. use_getnameinfo=0 if test $use_getnameinfo = 1 ; then dnl Done. AC_DEFINE(USE_GETNAMEINFO, 1, [use getnameinfo for name resolution]) else dnl Best hope is netdb, which presently means gethostbyaddr_r. resolver=netdb fi fi if test x$resolver = xnetdb ; then dnl Can use gethostbyaddr_r? AC_SEARCH_LIBS(gethostbyaddr_r, [nsl], , [resolver=guess]) if test x$resolver = xguess && test x$specified_resolver != xguess ; then dnl They wanted gethostbyaddr_r, but they can't have it, so stop. AC_MSG_ERROR([no library defines gethostbyaddr_r]) fi fi dnl We still might do gethostbyaddr_r. Figure out whether we have dnl glibc-style or Solaris-style gethostbyaddr_r (or neither...). dnl Separate determining how to call gethostbyaddr_r from testing dnl whether it works so we can support cross-compilation. if test x$resolver = xnetdb ; then AC_MSG_CHECKING([how to call gethostbyaddr_r]) dnl Try 7 arguments returning a struct hostent*. AC_LINK_IFELSE(AC_LANG_SOURCE([`cat config/hostentp_ghba_r.c`]), [AC_MSG_RESULT([7 args]) ghba_args=8 AC_DEFINE(GETHOSTBYADDR_R_RETURNS_HOSTENT_P, 1, [7-argument gethostbyaddr_r returns struct hostent*])], [ dnl Try 8 arguments returning an int. AC_LINK_IFELSE(AC_LANG_SOURCE([`cat config/int_ghba_r.c`]), [AC_MSG_RESULT([8 args, int return]) ghba_args=8 AC_DEFINE(GETHOSTBYADDR_R_RETURNS_INT, 1, [8-argument gethostbyaddr_r returns int])], [ dnl Neither. AC_MSG_RESULT([don't know how]) resolver=guess])]) if test x$resolver = xguess && test x$specified_resolver != xguess ; then dnl They wanted gethostbyaddr_r, but they can't have it, so stop. AC_MSG_ERROR([gethostbyaddr_r has no known calling convention]) fi fi dnl If we still want to do gethostbyaddr_r, and we aren't dnl cross-compiling, test it. if test x$resolver = xnetdb ; then if test x$ghba_args = x8 ; then testfile=int_ghba_r else testfile=hostentp_ghba_r fi AC_MSG_CHECKING(gethostbyaddr_r usability) AC_RUN_IFELSE([`cat config/$testfile.c`], [AC_MSG_RESULT([yes])], [AC_MSG_RESULT([no]) resolver=guess], [AC_MSG_RESULT([can't test because we are cross-compiling])]) if test x$resolver = xguess ; then if test x$specified_resolver = xguess ; then AC_MSG_RESULT([gethostbyaddr_r doesn't work, so we'll try something else]) else dnl They wanted gethostbyaddr_r, but it doesn't work, so stop. AC_MSG_ERROR([gethostbyaddr_r doesn't work]) fi fi fi dnl We found a gethostbyaddr_r we know how to use and which seems to dnl work. if test x$resolver = xnetdb ; then AC_DEFINE(USE_GETHOSTBYADDR_R, 1, [use gethostbyaddr_r for name resolution]) fi dnl They may have asked for ares. if test x$resolver = xares ; then dnl See if ares is to hand.... AC_SEARCH_LIBS(ares_init, [ares], [ AC_DEFINE(USE_ARES, 1, [use ARES for name resolution]) ], [ dnl They asked for ares, but we can't give it to them, so stop. AC_MSG_ERROR([can't find ARES. Re-run configure and ask for a different resolver.])]) fi dnl Last thing to try if we haven't decided yet is netdb_1thread. if test x$resolver = xguess ; then resolver=netdb_1thread fi dnl Ugh. Both the single-threaded and the forking resolvers use gethostbyaddr. if test x$resolver = xnetdb_1thread || test x$resolver = xforking ; then AC_SEARCH_LIBS(gethostbyaddr, [nsl], , [ AC_MSG_ERROR([gethostbyaddr is not available. You will have to recompile with no name resolution at all.])]) if test x$resolver = xnetdb_1thread ; then AC_MSG_WARN([using single-threaded resolver with gethostbyaddr Consider obtaining ARES or a machine with a working gethostbyaddr_r.]) AC_DEFINE(USE_GETHOSTBYADDR, 1, [use gethostbyaddr for name resolution]) else AC_DEFINE(USE_FORKING_RESOLVER, 1, [use a REALLY SUCKY forking resolver for name resolution]) fi fi dnl Otherwise, no resolver at all. Boo hoo. dnl dnl Find libpcap. dnl if test x$libpcap_prefix = x ; then libpcap_prefix="/usr /usr/local /opt /software" fi AC_MSG_CHECKING([where to find pcap.h]) foundpcaph=0 oldCPPFLAGS=$CPPFLAGS for test_prefix in "" $libpcap_prefix ; do for x in "" /pcap ; do if test x$test_prefix != x ; then CPPFLAGS="$oldCPPFLAGS -I$test_prefix/include$x" fi AC_TRY_CPP([ #include ], [ AC_MSG_RESULT([$test_prefix/include$x]) foundpcaph=1 break ]) done if test $foundpcaph = 1 ; then break fi done if test $foundpcaph = 0 ; then AC_MSG_RESULT([no idea]) AC_MSG_ERROR([can't find pcap.h You're not going to get very far without libpcap.]) else dnl assume that -lpcap is under $test_prefix/lib if test x$test_prefix != x ; then LDFLAGS="$LDFLAGS -L$test_prefix/lib" fi AC_CHECK_LIB(pcap, pcap_open_live, , [ AC_MSG_ERROR([can't find libpcap You're not going to get very far without libpcap.]) ]) fi foundpcap=0 AC_CHECK_HEADERS([pcap.h pcap/pcap.h], [ foundpcap=1 break ]) if test $foundpcap = 0 ; then AC_MSG_ERROR([can't find pcap.h You're not going to get very far without libpcap.]) fi dnl dnl Curses. Really, we need ncurses or something similarly advanced, since dnl we use the (apparently obscure) mvchgat function. Unfortunately, there's dnl a solid chance that mvchgat is a macro, so we can't just use dnl AC_SEARCH_LIBS.... dnl AC_MSG_CHECKING([for a curses library containing mvchgat]) oldLIBS=$LIBS for curseslib in curses ncurses ; do LIBS="$oldLIBS -l$curseslib" AC_TRY_LINK([ #include ], [ mvchgat(0, 0, 1, A_REVERSE, 0, NULL) ], [ foundcurseslib=$curseslib break ]) done if test x$foundcurseslib = x ; then AC_MSG_RESULT([none found]) AC_MSG_ERROR([Curses! Foiled again! (Can't find a curses library supporting mvchgat.) Consider installing ncurses.]) else AC_MSG_RESULT([-l$foundcurseslib]) fi dnl dnl POSIX threads. Different systems like different combinations of flags, dnl libraries, etc. We use a test program to figure this stuff out. dnl AC_MSG_CHECKING([POSIX threads compilation]) thrfail=1 oldCFLAGS=$CFLAGS oldLIBS=$LIBS for flag in "" -mt -pthread -thread ; do CFLAGS="$oldCFLAGS $flag" for lib in "" -lpthread "-lpthread -lposix4" ; do LIBS="$oldLIBS $lib" AC_LINK_IFELSE(AC_LANG_SOURCE([`cat config/pthread.c`]), [ foundthrlib=$lib foundthrflag=$flag thrfail=0 break ]) done if test $thrfail = 0 ; then break fi done if test $thrfail = 1 ; then AC_MSG_RESULT([no idea]) AC_MSG_ERROR([can't figure out how to compile with POSIX threads If your system actually supports POSIX threads, this means we've messed up.]) fi AC_MSG_RESULT([CFLAGS=$foundthrflag and LIBS=$foundthrlib]) AC_MSG_CHECKING([POSIX threads usability]) AC_RUN_IFELSE([`cat config/pthread.c`], [AC_MSG_RESULT([yes])], [AC_MSG_ERROR( [it fails. We probably guessed the wrong CFLAGS.])], [AC_MSG_RESULT([can't test because we are cross-compiling])]) dnl dnl Are we on a system (like Solaris) that requires promiscuous mode in order to dnl see any outgoing packets? dnl AC_MSG_CHECKING([if we need to enable promiscuous mode by default]) enable_default_promiscuous="no" case "$host_os" in solaris*) enable_default_promiscuous="yes" ;; esac AC_ARG_ENABLE(default-promiscuous, [ --enable-default-promiscuous If enabled, iftop will operate in promiscuous mode to capture outgoing packets]) AC_MSG_RESULT([$enable_default_promiscuous]) if test x"$enable_default_promiscuous" = x"yes"; then AC_DEFINE([NEED_PROMISCUOUS_FOR_OUTGOING],1,[Enable default promiscuous mode to capture outgoing packets]) fi dnl dnl Wahey! This might even work. dnl AC_SUBST(ac_aux_dir) AC_OUTPUT(Makefile config/Makefile) if echo $VERSION | grep 'pre' ; then AC_MSG_WARN([ ****************************************************************************** This is a pre-release version. Pre-releases are subject to limited announcements, and therefore limited circulation, as a means of testing the more widely circulated final releases. Please do not be surprised if this release is utterly, utterly broken. If you do find this release to be utterly, utterly broken, do not assume that someone else has spotted it. Instead, please drop a note on the mailing list, or a brief email to me on pdw@ex-parrot.com Thank you for taking the time to be the testing phase of this development process. Paul Warren ****************************************************************************** ]) fi