/usr/bin/mgpnet is in mgp 1.13a+upstream20090219-3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#
# Copyright (C) 1997 and 1998 WIDE Project. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. Neither the name of the project nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $Id: mgpnet.in,v 1.5 2009/02/18 10:44:31 nishida Exp $
#
# configurations
$tmpdir = '/tmp';
$httpdatestr = "env LC_ALL=C date '+\%a, \%d \%b \%Y \%H:\%M:\%S \%Z'";
$seltimeout = 1;
$refreshtimeout = 10;
$debug = 0;
$port = 9999;
# it looks that "charset" parameter for Content-type makes many browsers
# unhappy. it is a shame.
$usecharset = 0;
# do not edit beyond here
$hostname = `hostname`;
$hostname =~ s/\n$//;
# portable?
if (scalar(@ARGV) == 0) {
open(IN, "ifconfig -a | grep 'inet '|") && do {
do {
$hostname = (split(/\s+/, <IN>))[2];
} while ($hostname =~ /^127\./);
close(IN);
};
$hostname =~ s/^addr://; # for GNU/Linux, by ukai
print "http://$hostname:$port/\n";
exit 0;
}
# greeting
print STDERR "welcome to MagicPoint Netserver...\n";
# parameter parsing
$tmpseed = 0;
$checkfile = &tmpname;
if (grep($ARGV[$_] eq '-T', 0 .. scalar(@ARGV) - 1)) {
$checkfile = $ARGV[$_ + 1];
} else {
@ARGV = ('-T', $checkfile, @ARGV);
}
$imagefile = &tmpname;
$checkcontent = '';
# OS parameter
&guessparam;
if (!defined $AF_INET || !defined $PF_INET || !defined $SOCK_STREAM
|| !defined $sockaddr || !defined $WNOHANG) {
print STDERR "could not guess system parameter. edit by hand.\n";
exit 1;
}
# HTTP/1.0 related
$tmp = <<EOF;
200 OK
201 Created
202 Accepted
204 No Content
301 Moved Permanently
302 Moved Temporarily
304 Not Modified
400 Bad Request
401 Unauthorized
403 Forbidden
404 Not Found
500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
EOF
foreach $i (split(/\n/, $tmp)) {
($j, $k) = split(/\t/, $i);
$httpmsg{$j} = $k;
}
# setting up socket.
$anyinaddr = pack('C4', 0, 0, 0, 0);
if ($havesinlen) {
$mysockaddr = pack($sockaddr, 14, $AF_INET, $port, $anyinaddr);
$hissockaddr = pack($sockaddr, 14, $AF_INET, $port, $anyinaddr);
} else {
$mysockaddr = pack($sockaddr, $AF_INET, $port, $anyinaddr);
$hissockaddr = pack($sockaddr, $AF_INET, $port, $anyinaddr);
}
$proto = (getprotobyname('tcp'))[2];
socket(S, $PF_INET, $SOCK_STREAM, $proto) || die "socket: $!";
if (defined $SOL_SOCKET && defined $SO_REUSEPORT) {
setsockopt(S, $SOL_SOCKET, $SO_REUSEPORT, 1);
}
bind(S, $mysockaddr) || die "bind: $!";
listen(S, 5) || die "listen: $!";
# fork/exec mgp
$mgppid = fork;
if ($mgppid < 0) {
print STDERR "could not invoke MagicPoint (fork): $!\n";
exit -1;
}
$SIG{'CHLD'} = 'chldhandler';
if ($mgppid == 0){
close(S);
exec 'mgp', @ARGV;
print STDERR "could not invoke MagicPoint (exec): $!\n"
}
$SIG{'TERM'} = 'IGNORE';
print STDERR "waiting for connection on port $port.\n";
$acceptstat = 0;
while (1) {
if (waitpid($mgppid, $WNOHANG) == -1) {
print STDERR "MagicPoint terminated.\n";
last;
}
# page changed?
&checkimgfile;
# wait for an event...
$rin = $win = $ein = '';
vec($rin, fileno(S), 1) = 1;
vec($win, fileno(S), 1) = 1;
$ewin = $rin | $win;
print STDERR "waiting for connection...\n" if ($debug);
($nfound, $timeleft) =
select($rout = $rin, $wout = $win, $eout = $ein, $seltimeout);
next if ($nfound <= 0);
if (vec($rout, fileno(S), 1)) {
print STDERR "accepting connection...\n" if ($debug);
accept(NS, S) || do {
print STDERR "server: accept fail\n" if ($debug);
next;
};
$acceptstat++;
print STDERR "connection accepted...\n" if ($debug);
$pid = fork;
if ($pid < 0) {
print STDERR "server: fork fail\n" if ($debug);
close(NS);
next;
} elsif ($pid) {
print STDERR "server: fork success\n" if ($debug);
close(NS);
next;
}
# http server task
print STDERR "http server task started...\n" if ($debug);
select(NS); $/ = "\n"; $| = 1;
&httpserver;
close(NS);
close(S);
exit;
}
}
print STDERR "leaving MagicPoint Netserver...\n";
print STDERR "accepted $acceptstat connections so far.\n";
close(NS);
close(S);
unlink($imagefile);
exit 0;
sub checkimgfile {
local($junk, $t);
local($imgtmp);
local($pid, $errout);
open(CHK, "< $checkfile") || return;
$junk = select(CHK); $/ = ''; $| = 1; select($junk);
$t = <CHK>;
close(CHK);
if ($checkcontent ne $t) {
print STDERR "page updated.\n";
$checkcontent = $t;
$pid = fork;
return if (0 < $pid); # if fork success, parent returns.
if ($pid == 0) {
print STDERR "window grab: fork success.\n" if ($debug);
} else {
print STDERR "window grab: fork fail, ".
"process without fork.\n" if ($debug);
}
$imgtmp = &tmpname;
$errout = ($debug ? '' : '2>&-');
system "xwintoppm -silent -name MagicPoint | ".
"ppmquant 256 $errout | ppmtopng $errout > $imgtmp";
if (-z $imgtmp) {
unlink $imgtmp;
$checkcontent = '';
} else {
unlink $imagefile;
link($imgtmp, $imagefile);
unlink $imgtmp;
$checkcontent = $t;
}
print STDERR 'window grab: done with ' .
($checkcontent eq '' ? 'failure' : 'success') . ".\n";
if ($pid == 0) {
print STDERR "window grab: forked process dies.\n"
if ($debug);
# if fork success, child dies.
exit 0;
}
}
}
sub chldhandler {
local($sig) = @_;
return if ($sig ne 'CHLD');
wait;
}
sub httpserver {
local($httpreq, $httpmethod, $httppath, $httpver, $httphost);
local($httpagent);
local($imgplace, $imgwidth, $imgheight, $buf, $imglen);
local($cthtml, $ctpng);
$cthtml = ($usecharset ? 'text/html; charset=us-ascii' : 'text/html');
$ctgif = 'image/png';
$httpreq = <NS>;
print STDERR 'HTTP in> ' . $httpreq if ($debug);
$httpreq =~ s/[\r\n]+$//;
$httpmethod = $httppath = $httpver = '';
($httpmethod, $httppath, $httpver) = split(/\s+/, $httpreq);
$httppath =~ s/http:\/\/[^:\/]+(:\d+)\//\//;
if ($httpver eq '' || $httpver =~ m'HTTP/1.0') {
; # ok
} else {
&httpheader(501, $cthtml) if ($httpver);
print <<EOF;
<HEAD><TITLE>Version not implemented</TITLE></HEAD>
<BODY><H1>Version not implemented</H1>
HTTP protocol version $httpversion not supported.<P>
</BODY>
EOF
return;
}
$httphost = "$hostname:$port";
if ($httpver) {
while (<NS>) {
$_ =~ s/[\r\n]+$//;
$httphost = $1 if ($_ =~ /^Host:\s*(\S+)$/i);
$httpagent = $1 if ($_ =~ /^User-Agent:\s*(\S+)$/i);
last if ($_ eq '');
print STDERR 'HTTP in> ' . $_ . "\n" if ($debug);
}
}
if ($httpmethod !~ /^(GET|HEAD)$/) {
&httpheader(501, $cthtml) if ($httpver);
print <<EOF;
<HEAD><TITLE>Method not implemented</TITLE></HEAD>
<BODY><H1>Method not implemented</H1>
$httpmethod to $httppath not supported.<P>
</BODY>
EOF
return;
}
$imgwidth = $imgheight = 0;
if ($httppath =~ /^\/(\d+)x(\d+)\.html$/) {
$imgwidth = $1;
$imgheight = $2;
$httppath = '/index.html';
}
if ($httppath eq '/' || $httppath eq '/index.html') {
if ($imgwidth && $imgheight) {
$imgplace = "WIDTH=$imgwidth HEIGHT=$imgheight ";
} else {
$imgplace = '';
}
&httpheader(200, $cthtml) if ($httpver);
return if ($httpmethod ne 'GET');
if ($refreshtimeout) {
print <<EOF;
<META HTTP-EQUIV=\"Refresh\" CONTENT=$refreshtimeout>
EOF
}
print <<EOF;
<HEAD><TITLE>MagicPoint Netserver</TITLE></HEAD>
<BODY>
<IMG SRC=\"/presentation.png\" ALT=\"presentation image\"
$imgplace ALIGN=left><BR>
<TABLE border=0>
<TR><TD NOWRAP><A HREF=/index.html>normal</A>
<TR><TD NOWRAP><A HREF=/800x600.html>800x600</A>
<TR><TD NOWRAP><A HREF=/640x480.html>640x480</A>
<TR><TD NOWRAP><A HREF=/400x300.html>400x300</A>
<TR><TD NOWRAP><A HREF=/100x75.html>100x75</A>
</TABLE>
<BR CLEAR=left>
<HR>
<TABLE border=0>
<TR><TD NOWRAP ROWSPAN=2>
<FONT SIZE=+5><I>MagicPoint</I> Netserver</FONT>
<TD>
Presented by <A HREF=http://www.itojun.org/>itojun.org</A>
<TR><TD NOWRAP>
Supported by <A HREF=http://www.mew.org/mgp/>MagicPoint Project,</A>
<A HREF=http://www.wide.ad.jp/>WIDE Internet</A>
</TABLE>
</BODY></HTML>
EOF
} elsif ($httppath eq '/presentation.png') {
open(IMG, "< $imagefile") || do {
$checkcontent = ''; # invalidate
&httpheader(404, $cthtml) if ($httpver);
return if ($httpmethod ne 'GET');
print <<EOF;
<HEAD><TITLE>File Not found</TITLE></HEAD>
<BODY><H1>File Not found</H1>
The requested URL $httppath was not found on this server.<P>
Looks like a mistake in configuration.
Contact the administrator.<P>
</BODY>
EOF
return;
};
&httpheader(200, $ctpng) if ($httpver);
return if ($httpmethod ne 'GET');
while (0 < ($imglen = sysread(IMG, $buf, 4096))) {
syswrite(NS, $buf, $imglen);
}
close(IMG);
} else {
&httpheader(404, $cthtml) if ($httpver);
return if ($httpmethod ne 'GET');
print <<EOF;
<HEAD><TITLE>File Not found</TITLE></HEAD>
<BODY><H1>File Not found</H1>
The requested URL $httppath was not found on this server.<P>
</BODY>
EOF
}
}
sub httpheader {
local($code, $ct) = @_;
local($tmp);
local($date);
$date = `$httpdatestr`;
$date =~ s/[\r\n]+//;
$tmp = <<EOF;
HTTP/1.0 $code $httpmsg{$code}
Date: $date
Expires: $date
Server: MagicPointNetserver
Pragma: no-cache
Content-type: $ct
EOF
$tmp .= "\n";
$tmp =~ s/\n/\r\n/g;
print $tmp;
if ($debug) {
$tmp =~ s/\r\n/\n/g;
$tmp = join("\nHTTP out> ", split(/\n/, $tmp));
$tmp = 'HTTP out> ' . $tmp . "\n";
print STDERR $tmp;
}
}
#------------------------------------------------------------
sub guessparam {
local($tmpnam, $tmp, @tmp1, @tmp2);
local(%varnames);
%varnames = (
'XXX1', 'AF_INET', 'XXX2', 'PF_INET', 'XXX3', 'SOL_SOCKET',
'XXX4', 'SO_REUSEPORT', 'XXX5', 'SOCK_STREAM', 'XXX6', 'WNOHANG',
);
$tmpnam = &tmpname;
open(CPP, "| x86_64-linux-gnu-gcc -E - >$tmpnam") || return;
print CPP "#include <sys/socket.h>\n";
print CPP "#include <sys/wait.h>\n";
foreach $tmp (keys %varnames) {
print CPP "$tmp $varnames{$tmp}\n";
}
close(CPP) || return;
$tmp = '';
open(CPP, "< $tmpnam") || return;
while (<CPP>) {
$tmp .= $_;
}
close(CPP);
unlink $tmpnam;
@tmp1 = split(/\n/, $tmp);
if (grep($_ =~ /sin_len/, @tmp1)) {
$havesinlen = 1; $sockaddr = 'C C n a4 x8';
} else {
$havesinlen = 0; $sockaddr = 'S n a4 x8';
}
use Socket;
foreach $i (keys %varnames) {
if (@tmp2 = grep($_ =~ /^$i/, @tmp1)) {
$tmp = (split(/\s+/, @tmp2[0]))[1];
$tmp = oct($tmp) if ($tmp =~ /^0/);
if ($tmp =~ /^[0-9]+$/) {
eval "\$$varnames{$i} = \$tmp;";
} else {
# some constant defined by enum, so we can not
# always use cpp as above. I believe use Socket
# is more reliable in these days.
eval "\$$varnames{$i} = &$varnames{$i};";
}
}
}
}
sub tmpname {
local($fname);
do {
$fname = $tmpdir . '/' . time . '.' . $$ . '.' . $tmpseed++;
} while (-e $fname);
return $fname;
}
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