path: root/IkiWiki/Wrapper.pm

#!/usr/bin/perl

use warnings;
use strict;

package IkiWiki;

sub gen_wrapper () { #{{{
    eval q{use Cwd 'abs_path'};
    $config{srcdir}=abs_path($config{srcdir});
    $config{destdir}=abs_path($config{destdir});
    my $this=abs_path($0);
    if (! -x $this) {
        error("$this doesn't seem to be executable");
    }

    if ($config{setup}) {
        error("cannot create a wrapper that uses a setup file");
    }
    
    my @params=($config{srcdir}, $config{destdir},
        "--wikiname=$config{wikiname}",
        "--templatedir=$config{templatedir}");
    push @params, "--verbose" if $config{verbose};
    push @params, "--rebuild" if $config{rebuild};
    push @params, "--nosvn" if !$config{svn};
    push @params, "--cgi" if $config{cgi};
    push @params, "--url=$config{url}" if length $config{url};
    push @params, "--cgiurl=$config{cgiurl}" if length $config{cgiurl};
    push @params, "--historyurl=$config{historyurl}" if length $config{historyurl};
    push @params, "--diffurl=$config{diffurl}" if length $config{diffurl};
    push @params, "--anonok" if $config{anonok};
    push @params, "--adminuser=$_" foreach @{$config{adminuser}};
    my $params=join(" ", @params);
    my $call='';
    foreach my $p ($this, $this, @params) {
        $call.=qq{"$p", };
    }
    $call.="NULL";
    
    my @envsave;
    push @envsave, qw{REMOTE_ADDR QUERY_STRING REQUEST_METHOD REQUEST_URI
                   CONTENT_TYPE CONTENT_LENGTH GATEWAY_INTERFACE
               HTTP_COOKIE} if $config{cgi};
    my $envsave="";
    foreach my $var (@envsave) {
        $envsave.=<<"EOF"
    if ((s=getenv("$var")))
        asprintf(&newenviron[i++], "%s=%s", "$var", s);
EOF
    }
    
    open(OUT, ">ikiwiki-wrap.c") || error("failed to write ikiwiki-wrap.c: $!");;
    print OUT <<"EOF";
/* A wrapper for ikiwiki, can be safely made suid. */
#define _GNU_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

extern char **environ;

int main (int argc, char **argv) {
    /* Sanitize environment. */
    char *s;
    char *newenviron[$#envsave+3];
    int i=0;
$envsave
    newenviron[i++]="HOME=$ENV{HOME}";
    newenviron[i]=NULL;
    environ=newenviron;

    if (argc == 2 && strcmp(argv[1], "--params") == 0) {
        printf("$params\\n");
        exit(0);
    }
    
    execl($call);
    perror("failed to run $this");
    exit(1);
}
EOF
    close OUT;
    if (system("gcc", "ikiwiki-wrap.c", "-o", possibly_foolish_untaint($config{wrapper})) != 0) {
        error("failed to compile ikiwiki-wrap.c");
    }
    unlink("ikiwiki-wrap.c");
    if (defined $config{wrappermode} &&
        ! chmod(oct($config{wrappermode}), possibly_foolish_untaint($config{wrapper}))) {
        error("chmod $config{wrapper}: $!");
    }
    print "successfully generated $config{wrapper}\n";
} #}}}

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