mirror of https://gerrit.osmocom.org/asn1c
535 lines
16 KiB
Perl
Executable File
535 lines
16 KiB
Perl
Executable File
#!/usr/bin/perl -w
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#
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# $Id$
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#
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############################################################################
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# The following preferences may be modified to match the local environment #
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############################################################################
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# Directory with the users data.
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$TMPDIR = '/tmp/asn1c-cgi-jail/';
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$SUIDHelper = './asn1c-suid-helper';
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$SkeletonsDir = '/usr/local/share/asn1c'; # Will be needed only once
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$CompilerLocation = '/usr/local/bin/asn1c'; # asn1c binary location
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$HashProgramPath = 'md5'; # Program to hash the input
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$DM = 0750; # Directory mode for all mkdirs.
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$MaxHistoryItems = 5; # Number of items in History
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$DynamicHistory = 'yes'; # Full/Short history
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$warn = '<CENTER><FONT SIZE=+1><B>';
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$unwarn = '</B></FONT></CENTER>';
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$OpEnvFailed = 'Failed to create the operations\' environment:';
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$RandFailed = 'No source of randomness';
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$SandBoxInitFailed = 'User playground initialization failed';
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$myName = $ENV{SCRIPT_NAME}; # URL of this particular script (without args)
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$homePath = "<FONT FACE=Courier SIZE=-1>"
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. "<A HREF=http://lionet.info/>Home</A>"
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. " >> <A HREF=http://lionet.info/asn1c/>asn1c</A>"
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. " >> <A HREF=http://lionet.info/asn1c/asn1c.cgi>Free Online ASN.1 Compiler</A>"
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. "</FONT><P>";
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###################################################
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# The code below rarely requires any modification #
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###################################################
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my $content = ''; # Default content is empty
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use CGI qw/param cookie header upload escapeHTML/;
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$|=1; # Enable AutoFlush (for older versions of Perl)
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# If something goes wrong, this function is invoked to display the error message
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sub bark($@) {
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local $_ = join("<BR>\n", @_);
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$content = $warn . $_ . $unwarn;
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goto PRINTOUT;
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}
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# Make the directory name containing session files for the given Session ID
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sub makeSessionDirName($$) {
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local $pfx = shift; # Prefix is the name of the top-level directory
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local $sid = shift; # Session identifier (md5)
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$pfx . '/sessions/' . $sid . '/';
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}
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# Create ISO 8601 time string: "YYYY-MM-DDThh:mm:ss"
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my $cachedTime;
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sub isoTime() {
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return $cachedTime if $cachedTime;
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local @tm = localtime(time);
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$tm[5] += 1900;
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$tm[4] += 1;
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# Insert leading zeros
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for(my $i = 0; $i < 5; $i++) {
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$tm[$i] =~ s/^(.)$/0$1/;
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}
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$cachedTime = "$tm[5]-$tm[4]-$tm[3]T$tm[2]:$tm[1]:$tm[0]";
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}
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# Create the necessary environment for chrooting into.
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sub prepareChrootEnvironment() {
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return 1 if(-d $TMPDIR); # Envuronment already exists
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mkdir $TMPDIR, $DM, or bark($OpEnvFailed, $!); # Global directory
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mkdir $TMPDIR . 'sessions', $DM or bark($OpEnvFailed, $!); # sessions
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mkdir $TMPDIR . 'bin', $DM or bark($OpEnvFailed, $!); # asn1c location
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mkdir $TMPDIR . 'skeletons', $DM or bark($OpEnvFailed, $!); # asn1c data
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if(-d '/lib') {
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# Merge in dynamic libc
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mkdir $TMPDIR . 'lib', $DM or bark($OpEnvFailed, $!);
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system("cd $TMPDIR/lib && "
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. "for i in"
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. " /lib/ld-linux.*" # Linux ELF loader
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. " /lib/libc.*" # Standard C library
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. " /lib/libm.*" # Math library
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. '; do ln $i; done');
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} elsif(-d '/usr/lib') {
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# There's no /lib on MacOS
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mkdir $TMPDIR . 'usr', $DM or bark($OpEnvFailed, $!);
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mkdir $TMPDIR . 'usr/lib', $DM or bark($OpEnvFailed, $!);
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mkdir $TMPDIR . 'usr/lib/system', $DM or bark($OpEnvFailed, $!);
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system("cd $TMPDIR/usr/lib && "
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. "for i in"
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. " /usr/lib/libc.*"
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. " /usr/lib/libSystem.*"
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. " /usr/lib/system/libmath*"
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. " /usr/lib/dy*"
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. '; do ln $i; done');
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}
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if(-d '/usr/libexec') {
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# FreeBSD ELF loader
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mkdir $TMPDIR . 'usr', $DM;
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mkdir $TMPDIR . 'usr/libexec',$DM or bark($OpEnvFailed, $!);
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system("cd $TMPDIR/usr/libexec && "
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. 'for i in /usr/libexec/ld-elf.*; do ln $i; done');
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}
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system("cp $CompilerLocation $TMPDIR/bin 2>/dev/null") == 0
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or bark($OpEnvFailed, $!);
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system("cp -r $SkeletonsDir/* $TMPDIR/skeletons >/dev/null 2>&1") == 0
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or bark($OpEnvFailed, $!);
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return 1;
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}
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my $EnvironmentSetOK = prepareChrootEnvironment();
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#
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# Check if full history requested.
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#
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$HistoryShow = cookie('HistoryShow');
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$tmpHSParam = param('history'); # Control cookie setting
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if (defined($tmpHSParam)
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&& $tmpHSParam ne $HistoryShow
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&& $tmpHSParam =~ /^(full|short)$/) {
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$HistoryShow = $tmpHSParam;
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local $ck = cookie(-name=>'HistoryShow',
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-value=>$HistoryShow,
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-path=>'/', -expires=>'+1h');
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print "Set-Cookie: " . $ck . "\n";
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}
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#
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# Prepare the session and create the session directory.
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# If session exists, perfom arguments checking and execute historic views.
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#
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$session = cookie('SessionID');
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unless($session) {
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$session = '';
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open(R, '/dev/urandom')
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or open(R, '/dev/random')
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or bark($RandFailed);
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read(R, $session, 16) == 16 or bark("Not enough randomness");
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if($ENV{HTTP_USER_AGENT}) {
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$session .= $ENV{HTTP_USER_AGENT}; # Add randomness
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}
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my $pid = open(R, "-|");
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if($pid == 0) { # Child
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open(W, "| $HashProgramPath") or die;
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print W $session;
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exit(0);
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}
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$session = <R>;
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$session =~ s/[^a-f0-9]//ig;
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bark("md5 program is rotten here") if(length($session) != 32);
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$sessionDir = makeSessionDirName($TMPDIR, $session);
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mkdir($sessionDir, $DM) or bark($SandBoxInitFailed);
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my $ck = cookie(-name=>'SessionID', -value=>$session,
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-path=>'/', -expires=>'+1y');
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print header(-expires=>'-1y', -cookie=>$ck);
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$HTTPHeaderGenerated = 1;
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} else {
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$session =~ s/[^a-f0-9]//ig;
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bark("Nope, try again") if(length($session) != 32); # cool hacker?
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# Make sure the session directory exists
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$sessionDir = makeSessionDirName($TMPDIR, $session);
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mkdir($sessionDir, $DM) or bark($SandBoxInitFailed)
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unless(-d $sessionDir);
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local $t = param('time');
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local $trans = param('trans');
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local $fetch = param('fetch');
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local $show = param('show');
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unless($t =~ /^[0-9TZ:+-]{14,}$/ && $trans =~ /^[.a-z0-9_-]+$/i) {
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$fetch = '';
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$show = '';
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}
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if($fetch =~ /^[.a-z0-9_-]+$/i || $show =~ /^(log|tgz)$/) {
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local $fname = $sessionDir . '/' . $t . '--' . $trans;
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if($show eq 'tgz') {
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printf("Content-Type: application/x-tar\n");
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printf("Content-Encoding: gzip\n\n");
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exec("cd $fname && "
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. "for i in *.[ch]; do if [ -L \$i ]; then"
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. " cp $TMPDIR/skeletons/\$i \$i.-;"
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. " mv \$i.- \$i;"
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. " fi done && tar --dereference --owner nobody --group nobody -zcvf - ./*.[ch] ./Makefile*");
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exit(0);
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}
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if($show eq 'log') {
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$fname .= '/+Log';
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} else {
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$fname .= '/' . $fetch;
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}
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open(I, "< " . $fname)
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or bark("Invalid or outdated request: [$fname] [$show] $!");
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printf "Content-Type: text/plain\n\n";
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while(<I>) {
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print;
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}
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exit(0);
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}
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}
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open(LOG, ">> $sessionDir/+logfile") or bark("Sandbox error: $!");
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print LOG isoTime() . "\tIP=$ENV{REMOTE_ADDR}";
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@gotSafeNames = ();
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@gotNames = param('file');
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if($#gotNames != -1 && $gotNames[0] ne "") {
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$gotFile = param('file');
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@gotFiles = upload('file');
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} else {
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@gotNames = ();
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@gotFiles = ();
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$gotFile = undef;
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}
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if($#gotNames == -1) {
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my $text = param('text');
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if($text) {
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push(@gotNames, 'module.asn1');
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}
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}
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# Make safe filenames
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foreach my $fname (@gotNames) {
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local $_ = $fname;
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s/.*\///g; # Strip directory components
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s/.*\\//g; # Strip directory components (DOS version)
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s/^[.-]/_/g; # Don't allow filenames starting with a dot or a dash
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s/[^._a-z0-9-]/_/gi;
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if(!length($_)) {
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print LOG "\n";
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bark("Too strange filename: \"$fname\"");
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}
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$_ .= '.asn1' unless(/asn[1]{0,1}$/i);
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@gotSafeNames = (@gotSafeNames, $_);
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print LOG "\t" . $_;
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}
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#
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# Save the files and start compilation process.
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#
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if($#gotSafeNames >= 0) {
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$transactionDir = isoTime() . '--' . join("-", @gotSafeNames);
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print LOG "\tDST=$transactionDir";
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my $sandbox = $sessionDir . '/' . $transactionDir;
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mkdir($sandbox, $DM) or bark($SandBoxInitFailed);
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open(O, '> ' . $sandbox . '/+Names');
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print O join("\n", @gotNames);
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open(O, '> ' . $sandbox . '/+safeNames');
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print O join("\n", @gotSafeNames);
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for(my $i = 0; $i <= $#gotSafeNames; $i++) {
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local $name = $gotSafeNames[$i];
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open(O, '> ' . $sandbox . '/'. $name);
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if($#gotFiles == -1) {
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print O scalar(param('text'));
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} else {
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while(<$gotFile>) {
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print O;
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}
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}
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}
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close(O);
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my $inChDir = makeSessionDirName("/", $session) . $transactionDir;
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my $options = '';
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$options .= " -Wdebug-lexer" if(param("optDebugL") eq "on");
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$options .= " -E" if(param("optE") eq "on");
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$options .= " -EF" if(param("optEF") eq "on");
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$options .= " -fnative-types" if(param("optNT") eq "on");
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my $CompileASN = "$TMPDIR/bin/asn1c -v | sed -e 's/^/-- /'"
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. " > $sandbox/+Log 2>&1"
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. "; $SUIDHelper $TMPDIR $inChDir $options @gotSafeNames "
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. " >> $sandbox/+Log 2>&1"
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. "; echo \$? > $sandbox/+ExitCode";
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system($CompileASN);
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bark("Failed to initiate compilation process: $!")
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if(!-r $sandbox . '/+ExitCode');
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}
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#print join("<BR>\n", `env`);
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$form =
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"<FORM METHOD=POST ACTION=$myName ENCTYPE=\"multipart/form-data\">"
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. "Pick the ASN.1 module file:<BR>\n"
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. "<INPUT TYPE=file NAME=file SIZE=35><BR clear=all>\n"
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. "Alternatively, enter the ASN.1 specification into the area below:<BR>\n"
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. "<TEXTAREA NAME=text ROWS=15 COLS=60>\n"
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. "/*\n"
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. " * This ASN.1 specification is given for illustrative purposes\n"
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. " */\n"
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. "TestModule { iso org(3) dod(6) internet(1) private(4)\n"
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. " 1 spelio(9363) software(1) asn1c(5) webcgi(2) 1 }\n"
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. "DEFINITIONS ::= BEGIN\n"
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. "\n"
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. " TestType ::= SEQUENCE {\n"
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. " num INTEGER,\n"
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. " str UTF8String (SIZE(1..20)) OPTIONAL\n"
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. " }\n"
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. "\n"
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. "END\n"
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. "</TEXTAREA><BR>\n"
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. "<P>"
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. "<FONT SIZE=-1>"
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. "These options may be enabled to control the compiler's behavior:<BR>\n"
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. "<INPUT TYPE=checkbox NAME=optDebugL> Debug lexer (<I>-Wdebug-lexer</I>)<BR>\n"
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. "<INPUT TYPE=checkbox NAME=optE> Just parse and dump (do not compile) (<I>-E</I>)<BR>\n"
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. "<INPUT TYPE=checkbox NAME=optEF> Parse, perform semantic checks, and dump (<I>-E -F</I>)<BR>\n"
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. "<INPUT TYPE=checkbox NAME=optNT CHECKED=on> Employ native machine types (e.g. <b>double</b> instead of <b>REAL_t</b>) (<I>-fnative-types</I>)<BR>\n"
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. "</FONT>"
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. "<P>\n"
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. "<INPUT TYPE=submit VALUE=\"Proceed with ASN.1 compilation\">"
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. "</FORM>";
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#
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# Gather previous transactions to generate the history page.
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# The history page contains a list of several last ASN.1 files
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# which were uploaded for compilation into the system
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# by this particular browser (cookie-tracked).
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#
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opendir(SD, $sessionDir) or bark("Cannot open sandbox: $!");
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my @transactions = sort { $b cmp $a }
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(grep {/^[0-9TZ:+-]{14,}--[_.a-zA-Z0-9-]+$/}
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readdir(SD));
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my $CountHistoryItems = 0;
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foreach my $trans (sort { $b cmp $a } @transactions) {
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next unless($trans =~ /^([0-9TZ:+-]{14,})--([_.a-zA-Z0-9-]+)$/);
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local ($t, $f) = ($1, $2);
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local $origTime = $t;
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$t =~ s/T/ /; # "1999-01-02T13:53:12" => "1999-01-02 13:53:12"
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# Global transaction number
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local $tNum = 1 + $#transactions - $CountHistoryItems;
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# Open the list of file names under which these files are known
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# at the remote system.
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open(I, '< ' . $sessionDir . '/' . $trans . '/+Names');
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local @Names = <I>;
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# Open the list of "safe" file names under which these files
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# are known to our file system.
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open(I, '< ' . $sessionDir . '/' . $trans . '/+safeNames');
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local @safeNames = <I>;
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# Create a list of real file names whith appropriate links to the
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# "safe" file names for subsequent file fetching.
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local @markedNames = ();
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for(my $i = 0; $i <= $#Names; $i++) {
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local $_ = "<A HREF=\"$myName?time="
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. escapeHTML($origTime)
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. "&trans=$f"
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. "&fetch=$safeNames[$i]\">$Names[$i]</A>";
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@markedNames = (@markedNames, $_);
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}
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open(I, '< ' . $sessionDir . '/' . $trans . '/+ExitCode');
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local $ec = <I>;
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chop($ec);
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if($ec eq "0") {
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$results = "<FONT COLOR=darkgreen><B>"
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. "Compiled OK</B></FONT><BR>\n";
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} else {
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$results = "<FONT COLOR=darkred>"
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. "Error during compilation: $ec</FONT><BR>\n";
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}
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$results .= "<NOBR>"
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. (($ec eq "0") ? '1. ' : '')
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. "<A HREF=\"$myName?time="
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. escapeHTML($origTime)
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. "&trans=$f"
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. "&show=log\">"
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. "Show compiler log</A></NOBR>";
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if($ec eq "0") {
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$results .= "<BR>\n<NOBR>"
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. "2. <A HREF=\"$myName?time="
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. escapeHTML($origTime)
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. "&trans=$f"
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. "&show=tgz\">"
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. "Fetch results (.tgz)</A></NOBR>";
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} else {
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$results .= '<P>'
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. '<FONT SIZE=-1><A HREF="mailto:asn1c@lionet.info?Subject=asn1c compiler help: '
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. "transaction $tNum ("
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. join(', ', @safeNames)
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. ") failed with code $ec"
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. '&body=leave body empty or add more comments">Help me fix it!</A> (See bottom line)'
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. '</FONT>'
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;
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$atLeastOneError = 1;
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}
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$trColor = ' BGCOLOR=#f8f8f8';
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$trColor = ' BGCOLOR=#d0ffe0' unless($CountHistoryItems);
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$tNum = '<I>' . $tNum . '</I>' unless($CountHistoryItems);
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$history .= "<TR $trColor>"
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. "<TH ALIGN=center><FONT FACE=Helvetica SIZE=-2>$tNum</FONT></TH>"
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. "<TD ALIGN=center><FONT SIZE=-1 FACE=Helvetica>"
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. join(", ", @markedNames)
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. "</FONT></TD>"
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. "<TD><FONT SIZE=-2 FACE=Helvetica>"
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. $results
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. "</TD>"
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. "</TR>\n";
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last if(++$CountHistoryItems >= $MaxHistoryItems
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&& $HistoryShow ne 'full');
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}
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if($DynamicHistory eq 'yes') {
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# [Un-]limit number of history items
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$HistoryItemsHidden = 1 + $#transactions - $CountHistoryItems;
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if($HistoryItemsHidden > 0) {
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# Propose to expand the list.
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local $item = 'item';
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$HistoryItemsHidden == 1 or $item = 'items';
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$history .= "<TR BGCOLOR=white><TD COLSPAN=3 ALIGN=center>"
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. "<FONT SIZE=-1><A HREF=\"$myName?history=full\">"
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. "Show full history</A> "
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. "($HistoryItemsHidden hidden $item)"
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. "</FONT></TD></TR>\n";
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} elsif($HistoryShow eq "full" && $#transactions >= $MaxHistoryItems) {
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# Propose to shorten the list.
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local $item = 'item';
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$MaxHistoryItems == 1 or $item = 'items';
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$history .= "<TR BGCOLOR=white><TD COLSPAN=3 ALIGN=center>"
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. "<FONT SIZE=-1><A HREF=\"$myName?history=short\">"
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. "Short history</A> ($MaxHistoryItems $item)"
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. "</FONT></TD></TR>\n";
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}
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}
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if($history) {
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$history = "<H3>History</H3>"
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. "<TABLE CELLPADDING=0 CELLSPACING=0 BGCOLOR=#404040 WIDTH=100%><TR><TD>"
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. "<TABLE BORDER=0 CELLPADDING=5 CELLSPACING=1 WIDTH=100%>\n"
|
|
. "<TR BGCOLOR=#e0f0d0>"
|
|
. "<TH WIDTH=1%><FONT COLOR=#404040 FACE=Courier>N</FONT></TH>"
|
|
. "<TH><FONT COLOR=#404040 FACE=Courier>Files processed</FONT></TH>"
|
|
. "<TH><FONT COLOR=#404040 FACE=Courier>Result</FONT></TH>"
|
|
. "</TR>\n"
|
|
. $history . "</TABLE></TD></TR></TABLE><BR>\n";
|
|
|
|
if($atLeastOneError) {
|
|
$history .= "<FONT SIZE=-1 COLOR=#404040>"
|
|
. "<FONT COLOR=darkred><B>Bottom line:</B> ASN.1 compiler was unable to process some of the input files.</FONT><BR>"
|
|
. "This is typically caused by syntax errors in the input files.\n"
|
|
. "Such errors are normally fixed by removing or adding a couple of characters in the ASN.1 module.<BR>\n"
|
|
. "<BR><B><FONT COLOR=darkred>Please consider clicking on an appropriate "<I>Help me fix it!</I>" link above.</FONT></B><BR>\n"
|
|
. "An email will be sent to a person who will gladly fix the ASN.1 module for you. (The typical turn-around time is less than 24 hours.)\n"
|
|
. "<BR>This is <B>free</B>, and highly advisable.\n"
|
|
. "Your request will help us make a better compiler!\n"
|
|
. "<BR>Thank you."
|
|
. "</FONT>";
|
|
}
|
|
}
|
|
|
|
unless($history) {
|
|
$history = "<FONT SIZE=+2 COLOR=#a0a0a0>"
|
|
. "[compiled results will appear here]</FONT>";
|
|
$histValign = 'center';
|
|
} else {
|
|
$histValign = 'top';
|
|
}
|
|
|
|
$content .=
|
|
"<TABLE WIDTH=100% BORDER=0 CELLSPACING=5 CELLPADDING=5><TR><TD ID=inputbox VALIGN=top ROWSPAN=2 WIDTH=40%>\n"
|
|
. "<H3 ALIGN=center>ASN.1 Input</H3>\n"
|
|
. "$form"
|
|
. "</TD><TD WIDTH=60% HEIGHT=50% ALIGN=center VALIGN=$histValign>$history \n"
|
|
. "</TD></TR><TR><TD HEIGHT=50% VALIGN=bottom>"
|
|
. "<FONT SIZE=-1><B>Privacy Note:</B> this page is tailored "
|
|
. "to your browser using a cryprographically strong cookie. "
|
|
. "<I>Other users will see their own (different) data.</I> "
|
|
. "(<A HREF=asn1c-privacy.html>Read more...</A>)"
|
|
. "</FONT>"
|
|
. "</TD></TR></TABLE>";
|
|
|
|
$ua = $ENV{HTTP_USER_AGENT};
|
|
$ua =~ s/\\/\\\\/;
|
|
$ua =~ s/"/\\"/;
|
|
print LOG "\tUA=\"$ua\"";
|
|
print LOG "\n"; # Finalize logging record
|
|
|
|
PRINTOUT:
|
|
|
|
print header(-expires=>'-1y') unless($HTTPHeaderGenerated);
|
|
|
|
# If environment has never been set up completely, remove it.
|
|
if($EnvironmentSetOK != 1 && $TMPDIR ne "/") {
|
|
system("rm -rf $TMPDIR/ >/dev/null 2>&1");
|
|
}
|
|
|
|
print<<EOM;
|
|
<HTML>
|
|
<HEAD>
|
|
<TITLE>Free Online ASN.1 Compiler</TITLE>
|
|
<META NAME="Description" CONTENT="Free Online ASN.1 Compiler">
|
|
<STYLE TYPE="text/css">
|
|
TD#inputbox {
|
|
border-right: dashed 1px rgb(200, 200, 200);
|
|
}
|
|
</STYLE>
|
|
</HEAD>
|
|
<BODY BGCOLOR=white>
|
|
|
|
$homePath
|
|
|
|
$content
|
|
|
|
<HR WIDTH=70%>
|
|
<CENTER><ADDRESS><FONT SIZE=-1 FACE=Courier COLOR=#404040>
|
|
<A HREF=http://lionet.info/asn1c>The ASN.1 Compiler</A>
|
|
Copyright © 2003, 2004, 2005
|
|
Lev Walkin <<A HREF=mailto:vlm@lionet.info?Subject=asn1c>vlm@lionet.info</A>>
|
|
</FONT></ADDRESS></CENTER>
|
|
</BODY>
|
|
</HTML>
|
|
EOM
|