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#!/usr/bin/perl
use Socket;
use Carp;
use FileHandle;
use strict;
sub spawn; # forward declaration
open(FTPLOG, ">log/ftpd.log") ||
print STDERR "failed to open log file, runs without logging\n";
sub logmsg { print FTPLOG @_; }
my $verbose=0; # set to 1 for debugging
my $port = 8921; # just a default
do {
if($ARGV[0] eq "-v") {
$verbose=1;
}
elsif($ARGV[0] =~ /^(\d+)$/) {
$port = $1;
}
} while(shift @ARGV);
my $proto = getprotobyname('tcp') || 6;
my $ftp_sendfile=""; # set to a file name when the file should be sent
socket(Server, PF_INET, SOCK_STREAM, $proto)|| die "socket: $!";
setsockopt(Server, SOL_SOCKET, SO_REUSEADDR,
pack("l", 1)) || die "setsockopt: $!";
bind(Server, sockaddr_in($port, INADDR_ANY))|| die "bind: $!";
listen(Server,SOMAXCONN) || die "listen: $!";
print "FTP server started on port $port\n";
open(PID, ">.ftpserver.pid");
print PID $$;
close(PID);
my $waitedpid = 0;
my $paddr;
sub REAPER {
$waitedpid = wait;
$SIG{CHLD} = \&REAPER; # loathe sysV
# logmsg "reaped $waitedpid" . ($? ? " with exit $?" : '');
}
# USER is ok in fresh state
my %commandok = ( "USER" => "fresh",
"PASS" => "passwd",
"PASV" => "loggedin",
"PORT" => "loggedin",
"TYPE" => "loggedin|twosock",
"LIST" => "twosock",
"RETR" => "twosock",
"CWD" => "loggedin",
);
# initially, we're in 'fresh' state
my %statechange = ( 'USER' => 'passwd', # USER goes to passwd state
'PASS' => 'loggedin', # PASS goes to loggedin state
'PORT' => 'twosock', # PORT goes to twosock
'PASV' => 'twosock', # PASV goes to twosock
);
# this text is shown before the function specified below is run
my %displaytext = ('USER' => '331 We are happy you popped in!', # output FTP line
'PASS' => '230 Welcome you silly person',
'PORT' => '200 You said PORT - I say FINE',
'TYPE' => '200 I modify TYPE as you wanted',
'LIST' => '150 here comes a directory',
'CWD' => '250 CWD command successful.',
);
# callback functions for certain commands
my %commandfunc = ( 'PORT', \&PORT_command,
'LIST', \&LIST_command,
'PASV', \&PASV_command,
'RETR', \&RETR_command);
my $pid;
my @ftpdir=("total 20\r\n",
"drwxr-xr-x 8 98 98 512 Oct 22 13:06 .\r\n",
"drwxr-xr-x 8 98 98 512 Oct 22 13:06 ..\r\n",
"drwxr-xr-x 2 98 98 512 May 2 1996 .NeXT\r\n",
"-r--r--r-- 1 0 1 35 Jul 16 1996 README\r\n",
"lrwxrwxrwx 1 0 1 7 Dec 9 1999 bin -> usr/bin\r\n",
"dr-xr-xr-x 2 0 1 512 Oct 1 1997 dev\r\n",
"drwxrwxrwx 2 98 98 512 May 29 16:04 download.html\r\n",
"dr-xr-xr-x 2 0 1 512 Nov 30 1995 etc\r\n",
"drwxrwxrwx 2 98 1 512 Oct 30 14:33 pub\r\n",
"dr-xr-xr-x 5 0 1 512 Oct 1 1997 usr\r\n");
sub LIST_command {
# print "150 ASCII data connection for /bin/ls (193.15.23.1,59196) (0 bytes)\r\n";
for(@ftpdir) {
print KID_TO_WRITE $_;
# print STDERR "PASS: $_";
}
close(KID_TO_WRITE);
print "226 ASCII transfer complete\r\n";
return 0;
}
sub RETR_command {
my $testno = $_[0];
logmsg "RETR test number $testno\n";
my $filename = "data/reply$testno.txt";
my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
$atime,$mtime,$ctime,$blksize,$blocks)
= stat($filename);
if($size) {
print "150 Binary data connection for $testno () ($size bytes).\r\n";
open(FILE, "<$filename");
while(<FILE>) {
print KID_TO_WRITE $_;
# print STDERR "PASS: $_";
}
close(KID_TO_WRITE);
print "226 File transfer complete\r\n";
}
else {
print "550 $testno: No such file or directory.\r\n";
}
return 0;
}
# < 220 pm1 FTP server (SunOS 5.7) ready.
# > USER anonymous
# < 331 Guest login ok, send ident as password.
# > PASS curl_by_daniel@haxx.se
# < 230 Guest login ok, access restrictions apply.
# * We have successfully logged in
# * Connected to 127.0.0.1 (127.0.0.1)
# > PASV
# < 227 Entering Passive Mode (127,0,0,1,210,112)
# * Connecting to localhost (127.0.0.1) port 53872
# * Connected the data stream!
# > TYPE A
# < 200 Type set to A.
# > LIST
# < 150 ASCII data connection for /bin/ls (127.0.0.1,53873) (0 bytes).
#
sub PASV_command {
$pid = open(KID_TO_WRITE, "|-");
$SIG{ALRM} = sub { die "whoops, pipe broke" };
if(0 == $pid) {
# the child process runs the child function
}
else {
# parent continues
# print STDERR "parent after fork!\n";
return; # continue please
}
my $port = 10000;
socket(Server2, PF_INET, SOCK_STREAM, $proto) || die "socket: $!";
setsockopt(Server2, SOL_SOCKET, SO_REUSEADDR,
pack("l", 1)) || die "setsockopt: $!";
while($port < 11000) {
if(bind(Server2, sockaddr_in($port, INADDR_ANY))) {
last;
}
$port++; # try next port please
}
listen(Server2,SOMAXCONN) || die "listen: $!";
printf("227 Entering Passive Mode (127,0,0,1,%d,%d)\n",
($port/256), ($port%256));
my $waitedpid;
my $paddr;
$paddr = accept(Client2, Server2);
my($port,$iaddr) = sockaddr_in($paddr);
my $name = gethostbyaddr($iaddr,AF_INET);
logmsg "connection from $name [", inet_ntoa($iaddr), "] at port $port\n";
open(STDOUT, ">&Client2") || die "can't dup client to stdout";
# print STDERR "#### CONN\n";
while(<STDIN>) {
print $_;
# print STDERR "SEND: $_";
}
close(SOCK);
close(Client2);
exit;
}
sub PORT_command {
my $arg = $_[0];
# print STDERR "fooo: $arg\n";
$pid = open(KID_TO_WRITE, "|-");
$SIG{ALRM} = sub { die "whoops, pipe broke" };
if(0 == $pid) {
# the child process runs the child function
}
else {
# parent continues
# print STDERR "parent after fork!\n";
return; # continue please
}
# open(STDOUT, ">&Client") || die "can't dup client to stdout";
if($arg !~ /(\d+),(\d+),(\d+),(\d+),(\d+),(\d+)/) {
logmsg "bad PORT-line: $arg\n";
print "314 silly you, go away\r\n";
return 1;
}
my $iaddr = inet_aton("$1.$2.$3.$4");
my $paddr = sockaddr_in(($5<<8)+$6, $iaddr);
my $proto = getprotobyname('tcp') || 6;
socket(SOCK, PF_INET, SOCK_STREAM, $proto) || die "major failure";
# print STDERR "socket()\n";
connect(SOCK, $paddr) || return 1;
# print STDERR "connect()\n";
#while (defined($line = <SOCK>)) {
#print STDERR $line;
#}
# print STDERR "sending stdin to client\n";
while(<STDIN>) {
print SOCK $_;
# print STDERR "SEND: $_";
}
close(SOCK);
# print STDERR "close(SOCK)\n";
exit; # we're a chiuld process who dies!
}
$SIG{CHLD} = \&REAPER;
for ( $waitedpid = 0;
($paddr = accept(Client,Server)) || $waitedpid;
$waitedpid = 0, close Client)
{
next if $waitedpid and not $paddr;
my($port,$iaddr) = sockaddr_in($paddr);
my $name = gethostbyaddr($iaddr,AF_INET);
logmsg "connection from $name [", inet_ntoa($iaddr), "] at port $port\n";
# this code is forked and run
spawn sub {
open(INPUT, ">log/server.input") ||
logmsg "failed to open log/server.input\n";
# < 220 pm1 FTP server (SunOS 5.7) ready.
# > USER anonymous
# < 331 Guest login ok, send ident as password.
# > PASS curl_by_daniel@haxx.se
# < 230 Guest login ok, access restrictions apply.
# * We have successfully logged in
# * Connected to pm1 (193.15.23.1)
# > PASV
# < 227 Entering Passive Mode (193,15,23,1,231,59)
# * Connecting to pm1 (193.15.23.1) port 59195
# > TYPE A
# < 200 Type set to A.
# > LIST
# < 150 ASCII data connection for /bin/ls (193.15.23.1,59196) (0 bytes).
# * Getting file with size: -1
# flush data:
$| = 1;
print "220-running the curl suite test server\r\n",
"220-running the curl suite test server\r\n",
"220 running the curl suite test server\r\n";
my $state="fresh";
while(1) {
last unless defined ($_ = <STDIN>);
# Remove trailing CRLF.
s/[\n\r]+$//;
unless (m/^([A-Z]{3,4})\s?(.*)/i) {
print STDERR
"badly formed command received: ".$_;
exit 0;
}
my $FTPCMD=$1;
my $FTPARG=$2;
my $full=$_;
logmsg "GOT: ($1) $_\n";
print INPUT "$$: $full\n";
my $ok = $commandok{$FTPCMD};
if($ok !~ /$state/) {
print "314 $FTPCMD not OK ($ok) in state: $state!\r\n";
exit;
}
my $newstate=$statechange{$FTPCMD};
if($newstate eq "") {
# remain in the same state
#print "314 Wwwwweeeeird internal error state: $state\r\n";
#exit;
}
else {
$state = $newstate;
}
my $text = $displaytext{$FTPCMD};
if($text) {
print "$text\r\n";
}
# see if the new state is a function caller.
my $func = $commandfunc{$FTPCMD};
if($func) {
# it is!
\&$func($FTPARG);
}
logmsg "gone to state $state\n";
}
exit;
# print "Hello there, $name, it's now ", scalar localtime, "\r\n";
};
}
sub spawn {
my $coderef = shift;
unless (@_ == 0 && $coderef && ref($coderef) eq 'CODE') {
confess "usage: spawn CODEREF";
}
my $pid;
if (!defined($pid = fork)) {
logmsg "cannot fork: $!\n";
return;
} elsif ($pid) {
logmsg "begat $pid\n";
return; # I'm the parent
}
# else I'm the child -- go spawn
open(STDIN, "<&Client") || die "can't dup client to stdin";
open(STDOUT, ">&Client") || die "can't dup client to stdout";
## open(STDERR, ">&STDOUT") || die "can't dup stdout to stderr";
exit &$coderef();
}
|