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#!/usr/bin/perl
use warnings;
use strict;
use Cwd q{abs_path};
use Data::Dumper;
use IkiWiki;
package IkiWiki;
sub gen_wrapper () { #{{{
$config{srcdir}=abs_path($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 $wrapper=possibly_foolish_untaint($config{wrapper});
if (! defined $wrapper || ! length $wrapper) {
error("wrapper filename not specified");
}
delete $config{wrapper};
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", "$var", s);
EOF
}
if ($config{rcs} eq "svn" && $config{notify}) {
# Support running directly as hooks/post-commit by passing
# $2 in REV in the environment.
$envsave.=<<"EOF"
if (argc == 3)
asprintf(&newenviron[i++], "REV=%s", argv[2]);
else if ((s=getenv("REV")))
asprintf(&newenviron[i++], "%s=%s", "REV", s);
EOF
}
$Data::Dumper::Indent=0; # no newlines
my $configstring=Data::Dumper->Dump([\%config], ['*config']);
$configstring=~s/\\/\\\\/g;
$configstring=~s/"/\\"/g;
$configstring=~s/\n/\\\n/g;
open(OUT, ">$wrapper.c") || error("failed to write $wrapper.c: $!");;
print OUT <<"EOF";
/* A wrapper for ikiwiki, can be safely made suid. */
#define _GNU_SOURCE
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
extern char **environ;
int main (int argc, char **argv) {
/* Sanitize environment. */
char *s;
char *newenviron[$#envsave+5];
int i=0;
$envsave
newenviron[i++]="HOME=$ENV{HOME}";
newenviron[i++]="WRAPPED_OPTIONS=$configstring";
newenviron[i]=NULL;
environ=newenviron;
if (setregid(getegid(), -1) != 0 || setreuid(geteuid(), -1) != 0) {
perror("failed to drop real uid/gid");
exit(1);
}
execl("$this", "$this", NULL);
perror("failed to run $this");
exit(1);
}
EOF
close OUT;
if (system("gcc", "$wrapper.c", "-o", $wrapper) != 0) {
error("failed to compile $wrapper.c");
}
unlink("$wrapper.c");
if (defined $config{wrappermode} &&
! chmod(oct($config{wrappermode}), $wrapper)) {
error("chmod $wrapper: $!");
}
print "successfully generated $wrapper\n";
} #}}}
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