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#!/usr/bin/perl -w
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

require 5.004;
use strict;
package apxs;

##
##  Configuration
##

my %config_vars = ();

my $installbuilddir = "/usr/local/apache/build";
get_config_vars("$installbuilddir/config_vars.mk",\%config_vars);

# read the configuration variables once

my $prefix         = get_vars("prefix");
my $CFG_PREFIX     = $prefix;
my $exec_prefix    = get_vars("exec_prefix");
my $datadir        = get_vars("datadir");
my $localstatedir  = get_vars("localstatedir");
my $CFG_TARGET     = get_vars("progname");
my $CFG_SYSCONFDIR = get_vars("sysconfdir");
my $CFG_CFLAGS     = join ' ', map { get_vars($_) }
  qw(SHLTCFLAGS CFLAGS NOTEST_CPPFLAGS EXTRA_CPPFLAGS EXTRA_CFLAGS);
my $includedir     = get_vars("includedir");
my $CFG_INCLUDEDIR = eval qq("$includedir");
my $CFG_CC         = get_vars("CC");
my $libexecdir     = get_vars("libexecdir");
my $CFG_LIBEXECDIR = eval qq("$libexecdir");
my $sbindir        = get_vars("sbindir");
my $CFG_SBINDIR    = eval qq("$sbindir");
my $ltflags        = $ENV{'LTFLAGS'};
$ltflags or $ltflags = "--silent";

my %internal_vars = map {$_ => 1}
    qw(TARGET CC CFLAGS CFLAGS_SHLIB LD_SHLIB LDFLAGS_SHLIB LIBS_SHLIB
       PREFIX SBINDIR INCLUDEDIR LIBEXECDIR SYSCONFDIR);

##
##  parse argument line
##

#   defaults for parameters
my $opt_n = '';
my $opt_g = '';
my $opt_c = 0;
my $opt_o = '';
my @opt_D = ();
my @opt_I = ();
my @opt_L = ();
my @opt_l = ();
my @opt_W = ();
my @opt_S = ();
my $opt_e = 0;
my $opt_i = 0;
my $opt_a = 0;
my $opt_A = 0;
my $opt_q = 0;
my $opt_h = 0;
my $opt_p = 0;

#   this subroutine is derived from Perl's getopts.pl with the enhancement of
#   the "+" metacharacter at the format string to allow a list to be built by
#   subsequent occurrences of the same option.
sub Getopts {
    my ($argumentative, @ARGV) = @_;
    my $errs = 0;
    local $_;

    my @args = split / */, $argumentative;
    while (@ARGV && ($_ = $ARGV[0]) =~ /^-(.)(.*)/) {
        my ($first, $rest) = ($1,$2);
        if ($_ =~ m|^--$|) {
            shift @ARGV;
            last;
        }
        my $pos = index($argumentative,$first);
        if ($pos >= 0) {
            if ($pos < $#args && $args[$pos+1] eq ':') {
                shift @ARGV;
                if ($rest eq '') {
                    unless (@ARGV) {
                        error("Incomplete option: $first (needs an argument)");
                        $errs++;
                    }
                    $rest = shift(@ARGV);
                }
                eval "\$opt_$first = \$rest;";
            }
            elsif ($pos < $#args && $args[$pos+1] eq '+') {
                shift @ARGV;
                if ($rest eq '') {
                    unless (@ARGV) {
                        error("Incomplete option: $first (needs an argument)");
                        $errs++;
                    }
                    $rest = shift(@ARGV);
                }
                eval "push(\@opt_$first, \$rest);";
            }
            else {
                eval "\$opt_$first = 1";
                if ($rest eq '') {
                    shift(@ARGV);
                }
                else {
                    $ARGV[0] = "-$rest";
                }
            }
        }
        else {
            error("Unknown option: $first");
            $errs++;
            if ($rest ne '') {
                $ARGV[0] = "-$rest";
            }
            else {
                shift(@ARGV);
            }
        }
    }
    return ($errs == 0, @ARGV);
}

sub usage {
    print STDERR "Usage: apxs -g [-S <var>=<val>] -n <modname>\n";
    print STDERR "       apxs -q [-S <var>=<val>] <query> ...\n";
    print STDERR "       apxs -c [-S <var>=<val>] [-o <dsofile>] [-D <name>[=<value>]]\n";
    print STDERR "               [-I <incdir>] [-L <libdir>] [-l <libname>] [-Wc,<flags>]\n";
    print STDERR "               [-Wl,<flags>] [-p] <files> ...\n";
    print STDERR "       apxs -i [-S <var>=<val>] [-a] [-A] [-n <modname>] <dsofile> ...\n";
    print STDERR "       apxs -e [-S <var>=<val>] [-a] [-A] [-n <modname>] <dsofile> ...\n";
    exit(1);
}

#   option handling
my $rc;
($rc, @ARGV) = &Getopts("qn:gco:I+D+L+l+W+S+eiaAp", @ARGV);
&usage if ($rc == 0);
&usage if ($#ARGV == -1 and not $opt_g);
&usage if (not $opt_q and not ($opt_g and $opt_n) and not $opt_i and not $opt_c and not $opt_e);

#   argument handling
my @args = @ARGV;
my $name = 'unknown';
$name = $opt_n if ($opt_n ne '');

if (@opt_S) {
    my ($opt_S);
    foreach $opt_S (@opt_S) {
	if ($opt_S =~ m/^([^=]+)=(.*)$/) {
	    my ($var) = $1;
	    my ($val) = $2;
	    my $oldval = eval "\$CFG_$var";

	    unless ($var and $oldval) {
		print STDERR "apxs:Error: no config variable $var\n";
		&usage;
	    }

	    eval "\$CFG_${var}=\"${val}\"";
	} else {
	    print STDERR "apxs:Error: malformatted -S option\n";
	    &usage;
	}	
    }
}

##
##  Initial shared object support check
##
my $httpd = get_vars("sbindir") . "/" . get_vars("progname");
$httpd = eval qq("$httpd");
$httpd = eval qq("$httpd");
my $envvars = get_vars("sbindir") . "/envvars";
$envvars = eval qq("$envvars");
$envvars = eval qq("$envvars");

#allow apxs to be run from the source tree, before installation
if ($0 =~ m:support/apxs$:) {
    ($httpd = $0) =~ s:support/apxs$::;
}

unless (-x "$httpd") {
	error("$httpd not found or not executable");
	exit 1;
}

unless (grep /mod_so/, `. $envvars && $httpd -l`) {
    error("Sorry, no shared object support for Apache");
    error("available under your platform. Make sure");
    error("the Apache module mod_so is compiled into");
    error("your server binary `$httpd'.");
    exit 1;
}

sub get_config_vars{
    my ($file, $rh_config) = @_;

    open IN, $file or die "cannot open $file: $!";
    while (<IN>){
        if (/^\s*(.*?)\s*=\s*(.*)$/){
            $rh_config->{$1} = $2;
        }
    }
    close IN;
}

sub get_vars {
    my $result = '';
    my $ok = 0;
    my $arg;
    foreach $arg (@_) {
        if (exists $config_vars{$arg} or exists $config_vars{lc $arg}) {
            my $val = exists $config_vars{$arg}
                ? $config_vars{$arg}
                : $config_vars{lc $arg};
            $val =~ s/[()]//g;
            $result .= eval "qq($val)" if defined $val;
            $result .= ";;";
            $ok = 1;
        }
        if (not $ok) {
            if (exists $internal_vars{$arg} or exists $internal_vars{lc $arg}) {
                my $val = exists $internal_vars{$arg} ? $arg : lc $arg;
                $val = eval "\$CFG_$val";
                $result .= eval "qq($val)" if defined $val;
                $result .= ";;";
                $ok = 1;
            }
            if (not $ok) {
                error("Invalid query string `$arg'");
                exit(1);
            }
        }
    }
    $result =~ s|;;$||;
    $result =~ s|:| |;
    return $result;
}

##
##  Operation
##

#   helper function for executing a list of
#   system command with return code checks
sub execute_cmds {
    my (@cmds) = @_;
    my ($cmd, $rc);

    foreach $cmd (@cmds) {
        notice($cmd);
        $rc = system $cmd;
        if ($rc) {
            error(sprintf "Command failed with rc=%d\n", $rc << 8);
            exit 1 ;
        }
    }
}

if ($opt_g) {
    ##
    ##  SAMPLE MODULE SOURCE GENERATION
    ##

    if (-d $name) {
        error("Directory `$name' already exists. Remove first");
        exit(1);
    }

    my $data = join('', <DATA>);
    $data =~ s|%NAME%|$name|sg;
    $data =~ s|%TARGET%|$CFG_TARGET|sg;
    $data =~ s|%PREFIX%|$prefix|sg;
    $data =~ s|%INSTALLBUILDDIR%|$installbuilddir|sg;

    my ($mkf, $mods, $src) = ($data =~ m|^(.+)-=#=-\n(.+)-=#=-\n(.+)|s);

    notice("Creating [DIR]  $name");
    system("mkdir $name");
    notice("Creating [FILE] $name/Makefile");
    open(FP, ">${name}/Makefile") || die;
    print FP $mkf;
    close(FP);
    notice("Creating [FILE] $name/modules.mk");
    open(FP, ">${name}/modules.mk") || die;
    print FP $mods;
    close(FP);
    notice("Creating [FILE] $name/mod_$name.c");
    open(FP, ">${name}/mod_${name}.c") || die;
    print FP $src;
    close(FP);
    notice("Creating [FILE] $name/.deps");
    system("touch ${name}/.deps");

    exit(0);
}


if ($opt_q) {
    ##
    ##  QUERY INFORMATION 
    ##
    my $result = get_vars(@args);
    print "$result\n";
}

my $apr_config = get_vars("APR_CONFIG");

if (! -x "$apr_config") {
    error("$apr_config not found!");
    exit(1);
}

my $apu_config = get_vars("APU_CONFIG");

if (! -x "$apu_config") {
    error("$apu_config not found!");
    exit(1);
}

my $libtool = `$apr_config --apr-libtool`;
chomp($libtool);

my $apr_includedir = `$apr_config --includes`;
chomp($apr_includedir);
my $apu_includedir = `$apu_config --includes`;
chomp($apu_includedir);

if ($opt_c) {
    ##
    ##  SHARED OBJECT COMPILATION
    ##

    #   split files into sources and objects
    my @srcs = ();
    my @objs = ();
    my $f;
    foreach $f (@args) {
        if ($f =~ m|\.c$|) {
            push(@srcs, $f);
        }
        else {
            push(@objs, $f);
        }
    }

    #   determine output file
    my $dso_file;
    if ($opt_o eq '') {
        if ($#srcs > -1) {
            $dso_file = $srcs[0];
            $dso_file =~ s|\.[^.]+$|.la|;
        }
        elsif ($#objs > -1) {
            $dso_file = $objs[0];
            $dso_file =~ s|\.[^.]+$|.la|;
        }
        else {
            $dso_file = "mod_unknown.la";
        }
    }
    else {
        $dso_file = $opt_o;
        $dso_file =~ s|\.[^.]+$|.la|;
    }

    #   create compilation commands
    my @cmds = ();
    my $opt = '';
    my ($opt_Wc, $opt_I, $opt_D);
    foreach $opt_Wc (@opt_W) {
        $opt .= "$1 " if ($opt_Wc =~ m|^\s*c,(.*)$|);
    }
    foreach $opt_I (@opt_I) {
        $opt .= "-I$opt_I ";
    }
    foreach $opt_D (@opt_D) {
        $opt .= "-D$opt_D ";
    }
    my $cflags = "$CFG_CFLAGS";
    my $s;
    my $mod;
    foreach $s (@srcs) {
        my $slo = $s;
        $slo =~ s|\.c$|.slo|;
        my $lo = $s;
        $lo =~ s|\.c$|.lo|;
        my $la = $s;
        $la =~ s|\.c$|.la|;
        my $o = $s;
        $o =~ s|\.c$|.o|;
        push(@cmds, "$libtool $ltflags --mode=compile $CFG_CC $cflags -I$CFG_INCLUDEDIR $apr_includedir $apu_includedir $opt -c -o $lo $s && touch $slo");
        unshift(@objs, $lo);
    }

    #   create link command
    my $o;
    my $lo;	
    foreach $o (@objs) {
        $lo .= " $o";
    }
    my ($opt_Wl, $opt_L, $opt_l);
    $opt = '';
    foreach $opt_Wl (@opt_W) {
        $opt .= "$1 " if ($opt_Wl =~ m|^\s*l,(.*)$|);
    }
    foreach $opt_L (@opt_L) {
        $opt .= " -L$opt_L";
    }
    foreach $opt_l (@opt_l) {
        $opt .= " -l$opt_l";
    }

    if ($opt_p == 1) {
        
        my $apr_libs=`$apr_config --cflags --ldflags --link-libtool --libs`;
        chomp($apr_libs);
        my $apu_libs=`$apu_config --ldflags --link-libtool --libs`;
        chomp($apu_libs);
        
        $opt .= " ".$apu_libs." ".$apr_libs;
    }
    else {
        my $apr_ldflags=`$apr_config --ldflags`;
        chomp($apr_ldflags);
        $opt .= " -rpath $CFG_LIBEXECDIR -module -avoid-version $apr_ldflags";
    }

    push(@cmds, "$libtool $ltflags --mode=link $CFG_CC -o $dso_file $opt $lo");

    #   execute the commands
    &execute_cmds(@cmds);

    #   allow one-step compilation and installation
    if ($opt_i or $opt_e) {
        @args = ( $dso_file );
    }
}

if ($opt_i or $opt_e) {
    ##
    ##  SHARED OBJECT INSTALLATION
    ##

    #   determine installation commands
    #   and corresponding LoadModule directive
    my @lmd = ();
    my @cmds = ();
    my $f;
    foreach $f (@args) {
        #  ack all potential gcc, hp/ux, win32+os2+aix and os/x extensions
        if ($f !~ m#(\.so$|\.la$|\.sl$|\.dll$|\.dylib$|)#) {
            error("file $f is not a shared object");
            exit(1);
        }
        my $t = $f;
        $t =~ s|^.+/([^/]+)$|$1|;
        #  use .so unambigiously for installed shared library modules
        $t =~ s|\.[^./\\]+$|\.so|;
        if ($opt_i) {
	    push(@cmds, "$installbuilddir/instdso.sh SH_LIBTOOL='" .
                 "$libtool' $f $CFG_LIBEXECDIR");
	    push(@cmds, "chmod 755 $CFG_LIBEXECDIR/$t");
        }

        #   determine module symbolname and filename
        my $filename = '';
        if ($name eq 'unknown') {
            $name = '';
            my $base = $f;
            $base =~ s|\.[^.]+$||;
            if (-f "$base.c") {
                open(FP, "<$base.c");
                my $content = join('', <FP>);
                close(FP);
                if ($content =~ m|.*module\s+(?:AP_MODULE_DECLARE_DATA\s+)?([a-zA-Z0-9_]+)_module\s*=\s*.*|s) {
                    $name = "$1";
                    $filename = "$base.c";
                    $filename =~ s|^[^/]+/||;
                }
            }
            if ($name eq '') {
                if ($base =~ m|.*mod_([a-zA-Z0-9_]+)\..+|) {
                    $name = "$1";
                    $filename = $base;
                    $filename =~ s|^[^/]+/||;
                }
            }
            if ($name eq '') {
                error("Sorry, cannot determine bootstrap symbol name");
                error("Please specify one with option `-n'");
                exit(1);
            }
        }
        if ($filename eq '') {
            $filename = "mod_${name}.c";
        }
        my $dir = $CFG_LIBEXECDIR;
        $dir =~ s|^$CFG_PREFIX/?||;
        $dir =~ s|(.)$|$1/|;
	$t =~ s|\.la$|.so|;
        push(@lmd, sprintf("LoadModule %-18s %s", "${name}_module", "$dir$t"));
    }

    #   execute the commands
    &execute_cmds(@cmds);

    #   activate module via LoadModule/AddModule directive
    if ($opt_a or $opt_A) {
        if (not -f "$CFG_SYSCONFDIR/$CFG_TARGET.conf") {
            error("Config file $CFG_SYSCONFDIR/$CFG_TARGET.conf not found");
            exit(1);
        }

        open(FP, "<$CFG_SYSCONFDIR/$CFG_TARGET.conf") || die;
        my $content = join('', <FP>);
        close(FP);

        if ($content !~ m|\n#?\s*LoadModule\s+|) {
            error("Activation failed for custom $CFG_SYSCONFDIR/$CFG_TARGET.conf file.");
            error("At least one `LoadModule' directive already has to exist.");
            exit(1);
        }

        my $lmd;
        my $c = '';
        $c = '#' if ($opt_A);
        foreach $lmd (@lmd) {
            my $what = $opt_A ? "preparing" : "activating";
            my $lmd_re = $lmd;
            $lmd_re =~ s/\s+/\\s+/g;

            if ($content !~ m|\n#?\s*$lmd_re|) {
                # check for open <containers>, so that the new LoadModule
                # directive always appears *outside* of an <container>.

                my $before = ($content =~ m|^(.*\n)#?\s*LoadModule\s+[^\n]+\n|s)[0];

                # the '()=' trick forces list context and the scalar
                # assignment counts the number of list members (aka number
                # of matches) then
                my $cntopen = () = ($before =~ m|^\s*<[^/].*$|mg);
                my $cntclose = () = ($before =~ m|^\s*</.*$|mg);

                if ($cntopen == $cntclose) {
                    # fine. Last LoadModule is contextless.
                    $content =~ s|^(.*\n#?\s*LoadModule\s+[^\n]+\n)|$1$c$lmd\n|s;
                }
                elsif ($cntopen < $cntclose) {
                    error('Configuration file is not valid. There are sections'
                          . ' closed before opened.');
                    exit(1);
                }
                else {
                    # put our cmd after the section containing the last
                    # LoadModule.
                    my $found =
                    $content =~ s!\A (               # string and capture start
                                  (?:(?:
                                    ^\s*             # start of conf line with a
                                    (?:[^<]|<[^/])   # directive which does not
                                                     # start with '</'

                                    .*(?:$)\n        # rest of the line.
                                                     # the '$' is in parentheses
                                                     # to avoid misinterpreting
                                                     # the string "$\" as
                                                     # perl variable.

                                    )*               # catch as much as possible
                                                     # of such lines. (including
                                                     # zero)

                                    ^\s*</.*(?:$)\n? # after the above, we
                                                     # expect a config line with
                                                     # a closing container (</)

                                  ) {$cntopen}       # the whole pattern (bunch
                                                     # of lines that end up with
                                                     # a closing directive) must
                                                     # be repeated $cntopen
                                                     # times. That's it.
                                                     # Simple, eh? ;-)

                                  )                  # capture end
                                 !$1$c$lmd\n!mx;

                    unless ($found) {
                        error('Configuration file is not valid. There are '
                              . 'sections opened and not closed.');
                        exit(1);
                    }
                }
            } else {
                # replace already existing LoadModule line
                $content =~ s|^(.*\n)#?\s*$lmd_re[^\n]*\n|$1$c$lmd\n|s;
            }
            $lmd =~ m|LoadModule\s+(.+?)_module.*|;
            notice("[$what module `$1' in $CFG_SYSCONFDIR/$CFG_TARGET.conf]");
        }
        if (@lmd) {
            if (open(FP, ">$CFG_SYSCONFDIR/$CFG_TARGET.conf.new")) {
                print FP $content;
                close(FP);
                system("cp $CFG_SYSCONFDIR/$CFG_TARGET.conf $CFG_SYSCONFDIR/$CFG_TARGET.conf.bak && " .
                       "cp $CFG_SYSCONFDIR/$CFG_TARGET.conf.new $CFG_SYSCONFDIR/$CFG_TARGET.conf && " .
                       "rm $CFG_SYSCONFDIR/$CFG_TARGET.conf.new");
            } else {
                notice("unable to open configuration file");
            }
	}
    }
}

sub error{
    print STDERR "apxs:Error: $_[0].\n";
}

sub notice{
    print STDERR "$_[0]\n";
}

##EOF##
__DATA__
##
##  Makefile -- Build procedure for sample %NAME% Apache module
##  Autogenerated via ``apxs -n %NAME% -g''.
##

builddir=.
top_srcdir=%PREFIX%
top_builddir=%PREFIX%
include %INSTALLBUILDDIR%/special.mk

#   the used tools
APXS=apxs
APACHECTL=apachectl

#   additional defines, includes and libraries
#DEFS=-Dmy_define=my_value
#INCLUDES=-Imy/include/dir
#LIBS=-Lmy/lib/dir -lmylib

#   the default target
all: local-shared-build

#   install the shared object file into Apache 
install: install-modules-yes

#   cleanup
clean:
	-rm -f mod_%NAME%.o mod_%NAME%.lo mod_%NAME%.slo mod_%NAME%.la 

#   simple test
test: reload
	lynx -mime_header http://localhost/%NAME%

#   install and activate shared object by reloading Apache to
#   force a reload of the shared object file
reload: install restart

#   the general Apache start/restart/stop
#   procedures
start:
	$(APACHECTL) start
restart:
	$(APACHECTL) restart
stop:
	$(APACHECTL) stop

-=#=-
mod_%NAME%.la: mod_%NAME%.slo
	$(SH_LINK) -rpath $(libexecdir) -module -avoid-version  mod_%NAME%.lo
DISTCLEAN_TARGETS = modules.mk
shared =  mod_%NAME%.la
-=#=-
/* 
**  mod_%NAME%.c -- Apache sample %NAME% module
**  [Autogenerated via ``apxs -n %NAME% -g'']
**
**  To play with this sample module first compile it into a
**  DSO file and install it into Apache's modules directory 
**  by running:
**
**    $ apxs -c -i mod_%NAME%.c
**
**  Then activate it in Apache's %TARGET%.conf file for instance
**  for the URL /%NAME% in as follows:
**
**    #   %TARGET%.conf
**    LoadModule %NAME%_module modules/mod_%NAME%.so
**    <Location /%NAME%>
**    SetHandler %NAME%
**    </Location>
**
**  Then after restarting Apache via
**
**    $ apachectl restart
**
**  you immediately can request the URL /%NAME% and watch for the
**  output of this module. This can be achieved for instance via:
**
**    $ lynx -mime_header http://localhost/%NAME% 
**
**  The output should be similar to the following one:
**
**    HTTP/1.1 200 OK
**    Date: Tue, 31 Mar 1998 14:42:22 GMT
**    Server: Apache/1.3.4 (Unix)
**    Connection: close
**    Content-Type: text/html
**  
**    The sample page from mod_%NAME%.c
*/ 

#include "httpd.h"
#include "http_config.h"
#include "http_protocol.h"
#include "ap_config.h"

/* The sample content handler */
static int %NAME%_handler(request_rec *r)
{
    if (strcmp(r->handler, "%NAME%")) {
        return DECLINED;
    }
    r->content_type = "text/html";      

    if (!r->header_only)
        ap_rputs("The sample page from mod_%NAME%.c\n", r);
    return OK;
}

static void %NAME%_register_hooks(apr_pool_t *p)
{
    ap_hook_handler(%NAME%_handler, NULL, NULL, APR_HOOK_MIDDLE);
}

/* Dispatch list for API hooks */
module AP_MODULE_DECLARE_DATA %NAME%_module = {
    STANDARD20_MODULE_STUFF, 
    NULL,                  /* create per-dir    config structures */
    NULL,                  /* merge  per-dir    config structures */
    NULL,                  /* create per-server config structures */
    NULL,                  /* merge  per-server config structures */
    NULL,                  /* table of config file commands       */
    %NAME%_register_hooks  /* register hooks                      */
};