/usr/share/perl5/fb_net.pm is in frozen-bubble 2.2.0-2ubuntu3.
This file is owned by root:root, with mode 0o644.
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#
# Frozen-Bubble
#
# Copyright (c) 2004 Guillaume Cottenceau
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
#
#******************************************************************************
package fb_net;
use strict;
use IO::Socket;
use Fcntl;
use Errno qw(:POSIX);
use POSIX qw(uname);
use Time::HiRes qw(gettimeofday sleep);
use fb_stuff;
our $proto_major = '1'; #- this is our protocol level
our $proto_minor = '2'; #-
my $udp_server_port = 1511; #- a.k.a 0xF 0xB thx misc
$SIG{PIPE} = 'IGNORE'; #- stupid send/write low-level API sending SIGPIPE when server closes connection, and stupid Perl
#- not allowing flags in syswrite
#- UDP discover LAN servers with broadcast
sub discover_lan_servers {
my $socket = IO::Socket::INET->new(Proto => 'udp');
if (!$socket) {
print STDERR "Cannot create socket: $!\n";
return { failure => 'Cannot send broadcast.' };
}
if (!$socket->setsockopt(SOL_SOCKET, SO_BROADCAST, 1)) {
print STDERR "Cannot setsockopt: $!\n";
return { failure => 'Cannot send broadcast.' };
}
my $destpaddr = sockaddr_in($udp_server_port, INADDR_BROADCAST());
if (!$socket->send("FB/$proto_major\.$proto_minor SERVER PROBE", 0, $destpaddr)) {
print STDERR "Cannot send broadcast: $!\n";
return { failure => 'Network is down/no network?' };
}
my $inmask = '';
vec($inmask, fileno($socket), 1) = 1;
my @servers;
while (select(my $outmask = $inmask, undef, undef, 2)) {
my ($srcpaddr, $rcvmsg);
if (!defined($srcpaddr = $socket->recv($rcvmsg, 128, 0))) {
print STDERR "Cannot receive from socket: $!\n";
return { failure => 'Cannot read answer from broadcast.' };
}
my ($port, $ipaddr) = sockaddr_in($srcpaddr);
$ipaddr = inet_ntoa($ipaddr);
if ($rcvmsg =~ m|^FB/$proto_major\.\d SERVER HERE AT PORT (\d+)|) {
push @servers, { host => $ipaddr, port => $1 };
} else {
print STDERR "\nReceive weird/incompatible answer to UDP broadcast looking for LAN servers from $ipaddr:$port:\n\t$rcvmsg\n";
}
}
return { servers => \@servers };
}
#- before game operations
our $sock;
our $ping = 200;
our $masterserver; #- for forcing the masterserver on commandline
sub send_($) {
my ($msg) = @_;
if (defined($sock)) {
my $bytes = syswrite($sock, "FB/$proto_major.$proto_minor $msg\n");
!$bytes and disconnect();
}
}
sub disconnect() {
if (defined($sock)) {
close $sock;
$sock = undef;
}
}
sub isconnected() {
return defined($sock);
}
my $buffered_line;
sub readline_() {
if (!defined($sock)) {
return undef;
}
my $results = $buffered_line;
$buffered_line = undef;
eval {
local $SIG{ALRM} = sub { die "alarm\n" };
alarm 5; #- in seconds
while ($results !~ /\n/) {
my $buf;
my $bytes = sysread($sock, $buf, 1);
if (!defined($bytes)) {
if ($! == EAGAIN) {
sleep($ping/1000/3);
} elsif ($! == ECONNRESET) {
disconnect();
return $results;
} else {
print STDERR "Oops, system error: $!\n";
return undef;
}
} elsif ($bytes == 0) {
disconnect();
return $results;
} else {
$results .= $buf;
}
}
alarm 0;
($results, $buffered_line) = $results =~ /([^\n]+\n)(.*)?/s;
};
if ($@) {
print STDERR "Sorry, your computer or the network is too slow, giving up.\n";
disconnect();
die 'quit';
} else {
return $results;
}
}
sub readline_ifdata() {
$buffered_line and return readline_();
if (!defined($sock)) {
return undef;
}
my $buf;
my $bytes = sysread($sock, $buf, 1);
if (!defined($bytes)) {
if ($! == EAGAIN) {
return undef;
} elsif ($! == ECONNRESET) {
disconnect();
return undef;
} else {
print STDERR "Oops, system error: $!\n";
return undef;
}
} elsif ($bytes == 0) {
disconnect();
return;
} else {
if ($buf eq "\n") {
return $buf;
} else {
return $buf . readline_();
}
}
}
sub decode_msg($) {
my ($msg) = @_;
my ($command, $message) = $msg =~ m|^FB/\d+\.\d+ (\w+): (.*)|;
return ($command, $message);
}
sub send_and_receive($;$) {
my ($command, $rest) = @_;
send_("$command $rest");
my $answer = undef;
my $to_buffer;
while (!defined($answer)) {
my $msg = readline_();
!defined($msg) and $answer = '';
my ($rcv_command, $rcv_message) = fb_net::decode_msg($msg);
if ($rcv_command eq $command) {
$answer = $rcv_message;
} else {
#- this is not the answer we're waiting. keep that.
$to_buffer .= $msg;
}
}
$buffered_line .= $to_buffer;
return $answer;
}
sub list() {
my $msg = send_and_receive('LIST');
if ($msg =~ /(\S*) (\S*) free:(\d+) games:(\d+) playing:(\d+) at:(\S*)/) {
my $freenicks = $1;
my $freegames = $2;
my $free = $3;
my $games = $4;
my $playing = $5;
my $playing_geolocs = $6;
my @games;
while ($freegames =~ /\[([^\]]+)\]/g) {
push @games, [ split /,/, $1 ];
}
return ($free, $games, $freenicks, $playing, $playing_geolocs, @games);
} else {
return;
}
}
sub create($) {
my ($nick) = @_;
send_("CREATE $nick");
my $msg = readline_();
if ($msg =~ /CREATE: OK/) {
return 1;
} else {
$msg and print STDERR "Could not create game. Server said:\n\t$msg\n";
return 0;
}
}
sub join($$) {
my ($leader, $nick) = @_;
send_("JOIN $leader $nick");
my $msg = readline_();
if ($msg =~ /JOIN: OK/) {
return 1;
} else {
$msg and print STDERR "Could not join game. Server said:\n\t$msg\n";
return 0;
}
}
my $buffered_buf; #- the in game buffer. not to be read before game.
my @messages; #- the in game messages. same.
my ($current_name, $current_host, $current_port);
sub connect {
my ($host, $port) = @_;
my $perform_ping = 1;
my $tried_name;
if (!defined $host) {
#- reconnect
$host = $current_host;
$port = $current_port;
$tried_name = $current_name;
$perform_ping = 0;
} elsif (!defined $port) {
#- first param was a hash
my $params = $host;
$host = $params->{host};
$port = $params->{port};
$ping = $params->{ping};
$perform_ping = 0;
$tried_name = $params->{name};
}
$current_host = $current_port = undef;
$sock = IO::Socket::INET->new(PeerAddr => $host, PeerPort => $port, Proto => 'tcp', Timeout => 5);
if (!$sock) {
#print STDERR "Couldn't connect to $host:$port: $@\n";
return { failure => 'Server is down' };
}
$sock->autoflush;
$buffered_line = undef;
$buffered_buf = undef;
@messages = ();
my $msg;
eval { $msg = readline_(); };
$@ and return { failure => 'Server or computer too slow' };
my ($remote_major, $remote_minor, $isready) = $msg =~ m|^FB/(\d+).(\d+) (.*)|;
my ($servername, $serverlanguage);
if ($isready =~ /^PUSH: SERVER_READY (.*) (.*)/) {
$servername = $1;
$serverlanguage = $2;
} else {
disconnect();
if ($isready eq 'PUSH: SERVER_IS_FULL') {
print STDERR "Dropping $host:$port: server is full\n";
return { failure => 'Server is full' };
} elsif ($isready eq 'PUSH: SERVER_IS_OVERLOADED') {
print STDERR "Dropping $host:$port: server is overloaded\n";
return { failure => 'Server overloaded' };
} elsif ($remote_minor < $proto_minor) {
print STDERR "Dropping $host:$port: deprecated protocol $remote_major.$remote_minor\n";
return { failure => 'Server deprecated' };
} else {
print STDERR "Dropping $host:$port: not a Frozen-Bubble server\n";
return { failure => 'Not an FB server' };
}
}
if ($perform_ping) {
$ping = 200;
my @pings;
foreach (1..4) {
reping:
my $t0 = gettimeofday;
send_('PING');
eval { $msg = readline_(); };
$@ and return { failure => 'Server or computer too slow' };
my $t1 = gettimeofday;
if ($msg =~ /INCOMPATIBLE_PROTOCOL/) {
disconnect();
print STDERR "Dropping $host:$port: imcompatible Frozen-Bubble server\n";
return { failure => 'Incompatible server' };
} elsif ($msg =~ /PUSH/) {
#- drop PUSHes, server might be sending TALK messages which we don't care at that point
goto reping;
} elsif ($msg !~ /PONG/) {
print STDERR "$host:$port answer to PING was not recognized. Server said:\n\t$msg\n";
disconnect();
return { failure => 'Incompatible server' };
}
push @pings, ($t1-$t0) * 1000;
if ($_ == 2 && $pings[0] > 250 && $pings[1] > 250) {
#- don't wait too much on slower servers
last;
}
}
if (@pings > 2) { #- keep 2 worst
@pings = difference2(\@pings, [ min(@pings) ]) while @pings > 2;
}
$ping = sprintf("%.1f", sum(@pings)/@pings);
}
my $flags = $sock->fcntl(F_GETFL, 0);
if (!$flags) {
disconnect();
return { failure => 'Server is mad' };
}
$flags = $sock->fcntl(F_SETFL, $flags|O_NONBLOCK);
if (!$flags) {
disconnect();
return { failure => 'Server is crazy' };
}
$current_host = $host;
$current_port = $port;
$current_name = $tried_name;
return { ping => $ping, name => $servername, language => $serverlanguage };
}
sub current_server_name {
return $current_name;
}
sub current_server_hostport {
return "$current_host:$current_port";
}
sub reconnect() {
if (defined($current_host) && defined($current_port)) {
disconnect();
my $ret = fb_net::connect();
return exists $ret->{ping};
}
}
sub http_download($) {
my ($url) = @_;
my ($host, $port, $path) = $url =~ m,^http://([^/:]+)(?::(\d+))?(/\S*)?$,;
$port ||= 80;
my $sock = IO::Socket::INET->new(PeerAddr => $host, PeerPort => $port, Proto => 'tcp', Timeout => 5);
if (!$sock) {
print STDERR "Couldn't connect to $host:$port:\n\t$@\n";
return;
}
$sock->autoflush;
my ($sysname, undef, undef, undef, $machine) = uname();
my $bytes = syswrite($sock, join("\r\n",
"GET $path HTTP/1.0",
"Host: $host:$port",
"User-Agent: Frozen-Bubble client version $version (protocol version $proto_major.$proto_minor) on $sysname/$machine",
"", ""));
if (!$bytes) {
close $sock;
return;
}
#- skip until empty line
my ($now, $last, $buf, $tmp) = 0;
my $read = sub {
my $got = sysread($sock, $buf, 1);
if ($got == 0) {
die 'eof';
} elsif (!defined($got)) {
die "sys error: $!";
} else {
$tmp .= $buf;
};
};
eval {
do {
$last = $now;
&$read; &$read if $buf =~ /\015/;
$now = $buf =~ /\012/;
} until $now && $last;
if ($tmp =~ m|^HTTP/\d\.\d (.*\b(\d+)\b.*)| && $2 == 200) {
$tmp = '';
while (1) { &$read }
} else {
die "HTTP error fetching http://$host:$port$path: $1\n";
}
};
if ($@ =~ /^eof/) {
close $sock;
return $tmp;
} elsif ($@ =~ /^alarm/) {
die;
} else {
print STDERR "http_download: $@\n";
close $sock;
return;
}
}
sub get_server_list() {
my @masters = qw(http://www.frozen-bubble.org/servers/serverlist
http://frozen-bubble.sourceforge.net/serverlist
http://webother.linuxfr.org/serverlist
http://fb.mandrivalinux.org/serverlist);
foreach ($masterserver || map { "$_-$proto_major" } @masters) {
my $serverlist = http_download($_);
defined $serverlist and return $serverlist;
}
return;
}
our $myid;
sub setmyid($) {
$myid = $_[0];
}
sub sleep_reasonably {
sleep($ping/1000/3);
}
#- in game operations
#- data is command:parameters
#- supported commands:
#- ! (synchro) [this one is special, server propagates also to emitter]
#- a (angle)
#- A (attack)
#- b (bubble)
#- f (fire)
#- F (finished)
#- g (generatemalus)
#- l (leave)
#- m (malus)
#- M (malusstick)
#- n (newgame)
#- N (nextbubble)
#- r (rotate)
#- p (ping) [this one is special, server doesn't propagate back]
#- s (stick)
#- t (talk)
#- T (tobelaunchedbubble)
sub gsend($) {
my ($msg) = @_;
if (defined($sock)) {
my $bytes = syswrite($sock, $myid . "$msg\n");
!$bytes and disconnect();
}
}
sub grecv() {
my @msg = @messages;
@messages = ();
if (!defined($sock)) {
return @msg;
}
my $buf;
my $bytes = sysread($sock, $buf, 1024);
if (!defined($bytes)) {
if ($! == EAGAIN) {
return @msg;
} elsif ($! == ECONNRESET) {
disconnect();
return;
} else {
print STDERR "Oops, system error: $!\n";
return;
}
} elsif ($bytes == 0) {
disconnect();
return;
}
# print "received $bytes bytes, adding to buffered ", length($buffered_buf), "\n";
$buf = $buffered_buf . $buf;
$buffered_buf = undef;
# my @ascii = unpack("C*", $buf);
# print "bytes in buf: @ascii\n";
while ($buf) {
#- first byte of a "frame" is the id of the sender
my $id = substr($buf, 0, 1);
$buf = substr($buf, 1);
#- match data of a frame (NUL terminated)
if (my ($msg, $rest) = $buf =~ /([^\n]+)\n(.*)?/s) { #-?
$buf = $rest;
push @msg, { id => $id, msg => $msg };
# print "\trecv-msg:", ord($id), ":$msg\n";
} else {
#- no match means that we received a partial packet
# print "*** partial receive! for <$buf>, buffering (theoretically harmless)\n";
$buffered_buf = $id . $buf;
$buf = undef;
}
}
return @msg;
}
sub gdelay_messages(@) {
push @messages, @_;
}
sub grecv_get1msg_ifdata() {
my ($msg, @rest) = grecv();
push @messages, @rest;
return $msg;
}
sub grecv_get1msg {
eval {
local $SIG{ALRM} = sub { die "alarm\n" };
alarm 10;
while (!@messages) {
sleep($ping/1000/3);
@messages = grecv();
}
alarm 0;
};
if ($@) {
print STDERR "Sorry, we are not receiving the expected message. If the other ends are legal Frozen-Bubble\n" .
"clients, it means your computer or the network is too slow. Giving up.\n";
disconnect();
die 'quit';
} else {
return shift @messages;
}
}
1;
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