dnl $Id: configure.ac,v 2.69 2004-08-24 18:43:17 rjkaes Exp $

dnl Devlopers, please strive to achieve this order:
dnl
dnl 0. Initialization and options processing
dnl 1. Programs
dnl 2. Libraries
dnl 3. Header files
dnl 4. Types
dnl 5. Structures
dnl 6. Compiler characteristics
dnl 7. Functions, global variables
dnl 8. System services
dnl
dnl Read the Autoconf manual for details.

AC_INIT([tinyproxy], [1.7.1], [rjkaes@users.sourceforge.net])
AC_CONFIG_SRCDIR([src/tinyproxy.c])
AC_CONFIG_AUX_DIR(config)
AC_CONFIG_MACRO_DIR(config)
AC_PREREQ(2.52)

AC_CANONICAL_TARGET

AH_TEMPLATE([TARGET_SYSTEM],
	    [A string containing the target system for which tinyproxy was built.])
AC_DEFINE_UNQUOTED(TARGET_SYSTEM, ["$target"])

AM_INIT_AUTOMAKE($PACKAGE_NAME, $PACKAGE_VERSION)
AM_CONFIG_HEADER(config.h)

dnl Check if we're compiling on a weird platform :)
AC_AIX
AC_GNU_SOURCE
AC_MINIX

dnl
dnl Command line options
dnl

dnl Set the URL name for find the statistics of tinyproxy
AH_TEMPLATE([DEFAULT_STATHOST],
	[This controls remote proxy stats display.])
AC_ARG_WITH(stathost,
            [AC_HELP_STRING([--with-stathost=HOST], [Default status host])],
            [AC_DEFINE_UNQUOTED(DEFAULT_STATHOST, "$withval")],
	    [AC_DEFINE_UNQUOTED(DEFAULT_STATHOST, "tinyproxy.stats")])

dnl Set the default configuration file location
test "$prefix" = "NONE" && prefix=/usr/local

AH_TEMPLATE([DEFAULT_CONF_FILE],
	[This is the default file name for the configuration file.])
AC_ARG_WITH(config,
            [AC_HELP_STRING([--with-config=FILE],
                            [Set the default location of the config file])],
	    [tp_config_file="$withval"],
	    [tp_config_file="tinyproxy.conf"])

# If the first character is a slash, it's an absolute path
if [[ `echo $tp_config_file | cut -c1` = "/" ]]; then
	TINYPROXY_CONFIG_DIR=`echo "$tp_config_file" | sed 's/^\(.*\)\/[[^\/]]*$/\1/'`
        TINYPROXY_CONFIG_FILE=`echo "$tp_config_file" | sed 's/^.*\/\([[^\/]]*\)$/\1/'`
else
	# If sysconfdir is /usr/etc, change it to /etc (since /usr/etc doesn't exist)
	if [[ "/usr/etc" = `eval echo $sysconfdir` -a "/usr" = "$prefix" ]]; then
		TINYPROXY_CONFIG_DIR="/etc/tinyproxy"
	else
		TINYPROXY_CONFIG_DIR=`eval echo $sysconfdir/tinyproxy`
	fi
        TINYPROXY_CONFIG_FILE="$tp_config_file"
fi

AC_DEFINE_UNQUOTED(DEFAULT_CONF_FILE, "$TINYPROXY_CONFIG_DIR/$TINYPROXY_CONFIG_FILE")

AC_MSG_NOTICE([Default config location and file is: $TINYPROXY_CONFIG_DIR/$TINYPROXY_CONFIG_FILE])

dnl Add compiler-specific optimization flags
TP_ARG_ENABLE(debug,
              [Enable debugging support code and methods (default is NO)],
              no)

dnl Add in profiling information
TP_ARG_ENABLE(profiling,
              [Enable profiling information (default is NO)],
              no)

dnl Include SOCKS support
TP_ARG_ENABLE(socks,
              [Enable SOCKS support (default is NO)],
              no)

dnl Check to see if the XTinyproxy header is to be included
AH_TEMPLATE([XTINYPROXY_ENABLE],
	    [Define if you want to have the peer's IP address included in a XTinyproxy header sent to the server.])
TP_ARG_ENABLE(xtinyproxy,
              [Include the X-Tinyproxy header (default is YES)],
              yes)

if test x"$xtinyproxy_enabled" = x"yes"; then
    AC_DEFINE(XTINYPROXY_ENABLE)
fi

dnl Include filtering for domain/URLs
AH_TEMPLATE([FILTER_ENABLE],
	    [Defined if you would like filtering code included.])
TP_ARG_ENABLE(filter,
              [Enable filtering of domains/URLS (default is YES)],
              yes)

if test x"$filter_enabled" = x"yes"; then
    ADDITIONAL_OBJECTS="$ADDITIONAL_OBJECTS filter.o"
    AC_DEFINE(FILTER_ENABLE)
fi

dnl Include support for upstream proxies?
AH_TEMPLATE([UPSTREAM_SUPPORT],
            [Include support for connecting to an upstream proxy.])
TP_ARG_ENABLE(upstream,
              [Enable upstream proxying (default is YES)],
              yes)
if test x"$upstream_enabled" = x"yes"; then
    AC_DEFINE(UPSTREAM_SUPPORT)
fi

dnl Include support for reverse proxy?
AH_TEMPLATE([REVERSE_SUPPORT],
            [Include support for reverse proxy.])
TP_ARG_ENABLE(reverse,
              [Enable reverse proxying (default is NO)]
              no)
if test x"$reverse_enabled" = x"yes"; then
    AC_DEFINE(REVERSE_SUPPORT)
fi

dnl Include the transparent proxy support
AH_TEMPLATE([TRANSPARENT_PROXY],
	    [Include support for using tinyproxy as a transparent proxy.])
TP_ARG_ENABLE(transparent,
              [Enable transparent proxying code (default is NO)],
              no)
if test x"$transparent_enabled" = x"yes"; then
   AC_DEFINE(TRANSPARENT_PROXY)
fi

dnl
dnl Checks for programs
dnl

AC_PROG_MAKE_SET
AC_PROG_CC
AC_ISC_POSIX
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PROG_LIBTOOL
AC_PROG_RANLIB

dnl If a CFLAGS variable was passed during configure, set the initial
dnl CFLAGS variable to it; otherwise, start with an empty CFLAGS
if test x"$ac_env_CFLAGS_set" = x"set" ; then
    CFLAGS=$ac_env_CFLAGS_value
else
    CFLAGS=""
fi

dnl
dnl Checks for libraries
dnl
AC_CHECK_LIB(socket, socket, , [AC_CHECK_LIB(socket, htonl)])

dnl Some systems (OpenServer 5) dislike -lsocket -lnsl, so we try to
dnl avoid -lnsl checks, if we already have the functions which are
dnl usually in libnsl

unset ac_cv_func_yp_get_default_domain
AC_CHECK_FUNC(yp_get_default_domain,
              tinyproxy_no_nsl_checks=yes,
              tinyproxy_no_nsl_checks=no)
unset ac_cv_func_yp_get_default_domain

if test x"$tinyproxy_no_nsl_checks" != x"yes"; then
    AC_CHECK_LIB(nsl, gethostname, , [AC_CHECK_LIB(nsl, gethostbyaddr)])
fi

AC_CHECK_LIB(resolv, inet_aton)
AC_CHECK_LIB(socks, main, socks_library=yes, socks_library=no)

dnl
dnl Checks for headers
dnl
AC_HEADER_STDC
AC_HEADER_TIME
AC_HEADER_SYS_WAIT
AC_CHECK_HEADERS([sys/ioctl.h sys/mman.h sys/resource.h \
		  sys/select.h sys/socket.h sys/time.h sys/uio.h \
		  sys/un.h arpa/inet.h netinet/in.h \
		  assert.h ctype.h errno.h fcntl.h grp.h io.h libintl.h \
		  netdb.h pwd.h regex.h signal.h stdarg.h stddef.h stdio.h \
		  sysexits.h syslog.h time.h wchar.h wctype.h])

dnl OpenBSD machines don't like having malloc included (even if it's present)
dnl as they expect you to use stdlib.h
case "$target" in
    *-openbsd*) ;;
    *)         AC_CHECK_HEADER(malloc.h);;
esac

AC_CHECK_HEADER(socks.h, socks_header=yes, socks_header=no)


dnl
dnl Checks for types
dnl
AM_C_PROTOTYPES
AC_C_CONST
AC_C_INLINE
AC_TYPE_SIZE_T
AC_TYPE_PID_T
AC_TYPE_SIGNAL
AC_UNP_CHECK_TYPE(uint8_t, unsigned char)
AC_UNP_CHECK_TYPE(int16_t, short)
AC_UNP_CHECK_TYPE(uint16_t, unsigned short)
AC_UNP_CHECK_TYPE(int32_t, int)
AC_UNP_CHECK_TYPE(uint32_t, unsigned int)
AC_UNP_CHECK_TYPE(ssize_t, int)
AC_UNP_CHECK_TYPE(socklen_t, unsigned int)
AC_UNP_CHECK_TYPE(in_addr_t, uint32_t)


dnl
dnl Checks for libary functions
dnl
AC_FUNC_FORK
AC_FUNC_LSTAT
AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK
AC_FUNC_MALLOC
AC_FUNC_MMAP
AC_FUNC_REALLOC
AC_FUNC_SELECT_ARGTYPES
AC_FUNC_STRFTIME

AC_CHECK_FUNCS([gethostname inet_ntoa memchr memset select socket strcasecmp \
                strchr strdup strerror strncasecmp strpbrk strstr strtol])
AC_CHECK_FUNCS([isascii memcpy setrlimit ftruncate regcomp regexec])
AC_CHECK_FUNCS([strlcpy strlcat])

dnl
dnl Compiler characteristics
dnl

dnl If profiling is enabled, then enable the debugging code
if test x"$profiling_enabled" = x"yes" ; then
    AC_MSG_NOTICE([profiling is enabled, therefore enabling debugging code.])
    debug_enabled=yes
fi

dnl Enable the debugging flags (by checking for the GCC compiler)
if test x"$debug_enabled" = x"yes" ; then
    dnl Add the warnings if we have the GCC compiler
    if test x"$GCC" = x"yes" ; then
        if test x"$profiling_enabled" = x"yes" ; then
	    CFLAGS="-pg -fprofile-arcs $CFLAGS"
        fi
        CFLAGS="-Wshadow -Wcast-qual -Wcast-align -Wstrict-prototypes $CFLAGS"
        CFLAGS="-Wmissing-prototypes -Wmissing-declarations $CFLAGS"
        CFLAGS="-Wpointer-arith -Waggregate-return -Wnested-externs $CFLAGS"
    fi
    CFLAGS="-Wall -g $CFLAGS"
else
    dnl No debugging information, include the optimizations
    CFLAGS="-O2 -DNDEBUG $CFLAGS"
fi

dnl
dnl Make sure we can actually handle the "--with-*" and "--enable-*" stuff.
dnl

dnl Handle the SOCKS support
if test x"$socks_enabled" = x"yes"; then
    if test x"$socks_header" = x"yes" -a x"$socks_library" = x"yes"; then
        CFLAGS="-I/usr/include/sock.h -DSOCKS $CFLAGS"
        LIBS="-lsocks $LIBS"
    else
        AC_MSG_ERROR([Could not include the SOCKS library or header])
    fi
fi

dnl Handle the REGEX library
if test x"$ac_cv_func_regexec" != x"yes"; then
    AC_MSG_ERROR([Could not locate the regexec() function])
else
    AC_MSG_CHECKING([whether the system's regex library is broken])
    AC_CACHE_VAL(tinyproxy_cv_regex_broken,
                 [AC_TRY_RUN([
#if HAVE_SYS_TYPES_H
#  include <sys/types.h>
#endif
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#if HAVE_REGEX_H
# include <regex.h>
#endif
int main(void)
{
	regex_t blah;
	if (regcomp(&blah, "foo.*bar", REG_NOSUB) != 0)
		exit(1);
	if (regexec(&blah, "foobar", 0, NULL, 0) != 0)
		exit(1);
	else
		exit(0);

	return 0;
}
                            ],
                            tinyproxy_cv_regex_broken=no,
                            tinyproxy_cv_regex_broken=yes,
                            tinyproxy_cv_regex_broken=yes)])

    AC_MSG_RESULT([$tinyproxy_cv_regex_broken])

    if test x"$tinyproxy_cv_regex_broken" = x"yes" ; then
        AC_MSG_ERROR([Your system's regexec() function is broken.])
    fi
fi

dnl
dnl Substitute the variables into the various Makefiles
dnl
AC_SUBST(CFLAGS)
AC_SUBST(LDFLAGS)
AC_SUBST(CPPFLAGS)
AC_SUBST(LIBS)
AC_SUBST(ADDITIONAL_OBJECTS)
AC_SUBST(TINYPROXY_CONFIG_DIR)
AC_SUBST(TINYPROXY_CONFIG_FILE)

AC_CONFIG_FILES([Makefile src/Makefile doc/Makefile])
AC_OUTPUT