--- /dev/null
+#!/usr/bin/perl -w
+
+# Part of this code was borrowed from Richard Jones's Net::FTPServer
+# http://www.annexia.org/freeware/netftpserver
+
+package FTPServer;
+
+use strict;
+
+use Cwd;
+use Socket;
+use IO::Socket::INET;
+use IO::Seekable;
+use POSIX qw(strftime);
+
+my $log = undef;
+my $GOT_SIGURG = 0;
+
+# CONSTANTS
+
+# connection states
+my %_connection_states = (
+ 'NEWCONN' => 0x01,
+ 'WAIT4PWD' => 0x02,
+ 'LOGGEDIN' => 0x04,
+ 'TWOSOCKS' => 0x08,
+);
+
+# subset of FTP commands supported by these server and the respective
+# connection states in which they are allowed
+my %_commands = (
+ # Standard commands from RFC 959.
+ 'CWD' => $_connection_states{LOGGEDIN} |
+ $_connection_states{TWOSOCKS},
+# 'EPRT' => $_connection_states{LOGGEDIN},
+# 'EPSV' => $_connection_states{LOGGEDIN},
+ 'LIST' => $_connection_states{TWOSOCKS},
+# 'LPRT' => $_connection_states{LOGGEDIN},
+# 'LPSV' => $_connection_states{LOGGEDIN},
+ 'PASS' => $_connection_states{WAIT4PWD},
+ 'PASV' => $_connection_states{LOGGEDIN},
+ 'PORT' => $_connection_states{LOGGEDIN},
+ 'PWD' => $_connection_states{LOGGEDIN} |
+ $_connection_states{TWOSOCKS},
+ 'QUIT' => $_connection_states{LOGGEDIN} |
+ $_connection_states{TWOSOCKS},
+ 'REST' => $_connection_states{TWOSOCKS},
+ 'RETR' => $_connection_states{TWOSOCKS},
+ 'SYST' => $_connection_states{LOGGEDIN},
+ 'TYPE' => $_connection_states{LOGGEDIN} |
+ $_connection_states{TWOSOCKS},
+ 'USER' => $_connection_states{NEWCONN},
+ # From ftpexts Internet Draft.
+ 'SIZE' => $_connection_states{LOGGEDIN} |
+ $_connection_states{TWOSOCKS},
+);
+
+
+
+# COMMAND-HANDLING ROUTINES
+
+sub _CWD_command
+{
+ my ($conn, $cmd, $path) = @_;
+
+ local $_;
+ my $newdir = $conn->{dir};
+
+ # If the path starts with a "/" then it's an absolute path.
+ if (substr ($path, 0, 1) eq "/") {
+ $newdir = "";
+ $path =~ s,^/+,,;
+ }
+
+ # Split the path into its component parts and process each separately.
+ my @elems = split /\//, $path;
+
+ foreach (@elems) {
+ if ($_ eq "" || $_ eq ".") {
+ # Ignore these.
+ next;
+ } elsif ($_ eq "..") {
+ # Go to parent directory.
+ if ($newdir eq "") {
+ print {$conn->{socket}} "550 Directory not found.\r\n";
+ return;
+ }
+ $newdir = substr ($newdir, 0, rindex ($newdir, "/"));
+ } else {
+ # Go into subdirectory, if it exists.
+ $newdir .= ("/" . $_);
+ if (! -d $conn->{rootdir} . $newdir) {
+ print {$conn->{socket}} "550 Directory not found.\r\n";
+ return;
+ }
+ }
+ }
+
+ $conn->{dir} = $newdir;
+}
+
+sub _LIST_command
+{
+ my ($conn, $cmd, $path) = @_;
+
+ # This is something of a hack. Some clients expect a Unix server
+ # to respond to flags on the 'ls command line'. Remove these flags
+ # and ignore them. This is particularly an issue with ncftp 2.4.3.
+ $path =~ s/^-[a-zA-Z0-9]+\s?//;
+
+ my $dir = $conn->{dir};
+
+ print STDERR "_LIST_command - dir is: $dir\n";
+
+ # Absolute path?
+ if (substr ($path, 0, 1) eq "/") {
+ $dir = "/";
+ $path =~ s,^/+,,;
+ }
+
+ # Parse the first elements of the path until we find the appropriate
+ # working directory.
+ my @elems = split /\//, $path;
+ my ($wildcard, $filename);
+ local $_;
+
+ for (my $i = 0; $i < @elems; ++$i) {
+ $_ = $elems[$i];
+ my $lastelement = $i == @elems-1;
+
+ if ($_ eq "" || $_ eq ".") { next } # Ignore these.
+ elsif ($_ eq "..") {
+ # Go to parent directory.
+ unless ($dir eq "/") {
+ $dir = substr ($dir, 0, rindex ($dir, "/"));
+ }
+ } else {
+ if (!$lastelement) { # These elements can only be directories.
+ unless (-d $conn->{rootdir} . $dir . $_) {
+ print {$conn->{socket}} "550 File or directory not found.\r\n";
+ return;
+ }
+ $dir .= $_;
+ } else { # It's the last element: check if it's a file, directory or wildcard.
+ if (-f $conn->{rootdir} . $dir . $_) {
+ # It's a file.
+ $filename = $_;
+ } elsif (-d $conn->{rootdir} . $dir . $_) {
+ # It's a directory.
+ $dir .= $_;
+ } elsif (/\*/ || /\?/) {
+ # It is a wildcard.
+ $wildcard = $_;
+ } else {
+ print {$conn->{socket}} "550 File or directory not found.\r\n";
+ return;
+ }
+ }
+ }
+ }
+
+ print STDERR "_LIST_command - dir is: $dir\n" if $log;
+
+ print {$conn->{socket}} "150 Opening data connection for file listing.\r\n";
+
+ # Open a path back to the client.
+ my $sock = __open_data_connection ($conn);
+
+ unless ($sock) {
+ print {$conn->{socket}} "425 Can't open data connection.\r\n";
+ return;
+ }
+
+ # If the path contains a directory name, extract it so that
+ # we can prefix it to every filename listed.
+ my $prefix = (($filename || $wildcard) && $path =~ /(.*\/).*/) ? $1 : "";
+
+ print STDERR "_LIST_command - prefix is: $prefix\n" if $log;
+
+ # OK, we're either listing a full directory, listing a single
+ # file or listing a wildcard.
+ if ($filename) { # Single file.
+ __list_file ($sock, $prefix . $filename);
+ } else { # Wildcard or full directory $dirh.
+ unless ($wildcard) {
+ # Synthesize (fake) "total" field for directory listing.
+ print $sock "total 1 \r\n";
+ }
+
+ foreach (__get_file_list ($conn->{rootdir} . $dir, $wildcard)) {
+ __list_file ($sock, $prefix . $_);
+ }
+ }
+
+ unless ($sock->close) {
+ print {$conn->{socket}} "550 Error closing data connection: $!\r\n";
+ return;
+ }
+
+ print {$conn->{socket}} "226 Listing complete. Data connection has been closed.\r\n";
+}
+
+sub _PASS_command
+{
+ my ($conn, $cmd, $pass) = @_;
+
+ # TODO: implement authentication?
+
+ print STDERR "switching to LOGGEDIN state\n" if $log;
+ $conn->{state} = $_connection_states{LOGGEDIN};
+
+ if ($conn->{username} eq "anonymous") {
+ print {$conn->{socket}} "202 Anonymous user access is always granted.\r\n";
+ } else {
+ print {$conn->{socket}} "230 Authentication not implemented yet, access is always granted.\r\n";
+ }
+}
+
+sub _PASV_command
+{
+ my ($conn, $cmd, $rest) = @_;
+
+ # Open a listening socket - but don't actually accept on it yet.
+ "0" =~ /(0)/; # Perl 5.7 / IO::Socket::INET bug workaround.
+ my $sock = IO::Socket::INET->new (LocalHost => '127.0.0.1',
+ LocalPort => '0',
+ Listen => 1,
+ Reuse => 1,
+ Proto => 'tcp',
+ Type => SOCK_STREAM);
+
+ unless ($sock) {
+ # Return a code 550 here, even though this is not in the RFC. XXX
+ print {$conn->{socket}} "550 Can't open a listening socket.\r\n";
+ return;
+ }
+
+ $conn->{passive} = 1;
+ $conn->{passive_socket} = $sock;
+
+ # Get our port number.
+ my $sockport = $sock->sockport;
+
+ # Split the port number into high and low components.
+ my $p1 = int ($sockport / 256);
+ my $p2 = $sockport % 256;
+
+ $conn->{state} = $_connection_states{TWOSOCKS};
+
+ # We only accept connections from localhost.
+ print {$conn->{socket}} "227 Entering Passive Mode (127,0,0,1,$p1,$p2)\r\n";
+}
+
+sub _PORT_command
+{
+ my ($conn, $cmd, $rest) = @_;
+
+ # The arguments to PORT are a1,a2,a3,a4,p1,p2 where a1 is the
+ # most significant part of the address (eg. 127,0,0,1) and
+ # p1 is the most significant part of the port.
+ unless ($rest =~ /^\s*(\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3})/) {
+ print {$conn->{socket}} "501 Syntax error in PORT command.\r\n";
+ return;
+ }
+
+ # Check host address.
+ unless ($1 > 0 && $1 < 224 &&
+ $2 >= 0 && $2 < 256 &&
+ $3 >= 0 && $3 < 256 &&
+ $4 >= 0 && $4 < 256) {
+ print {$conn->{socket}} "501 Invalid host address.\r\n";
+ return;
+ }
+
+ # Construct host address and port number.
+ my $peeraddrstring = "$1.$2.$3.$4";
+ my $peerport = $5 * 256 + $6;
+
+ # Check port number.
+ unless ($peerport > 0 && $peerport < 65536) {
+ print {$conn->{socket}} "501 Invalid port number.\r\n";
+ }
+
+ $conn->{peeraddrstring} = $peeraddrstring;
+ $conn->{peeraddr} = inet_aton ($peeraddrstring);
+ $conn->{peerport} = $peerport;
+ $conn->{passive} = 0;
+
+ $conn->{state} = $_connection_states{TWOSOCKS};
+
+ print {$conn->{socket}} "200 PORT command OK.\r\n";
+}
+
+sub _PWD_command
+{
+ my ($conn, $cmd, $rest) = @_;
+
+ # See RFC 959 Appendix II and draft-ietf-ftpext-mlst-11.txt section 6.2.1.
+ my $pathname = $conn->{dir};
+ $pathname =~ s,/+$,, unless $pathname eq "/";
+ $pathname =~ tr,/,/,s;
+
+ print {$conn->{socket}} "257 \"$pathname\"\r\n";
+}
+
+sub _REST_command
+{
+ my ($conn, $cmd, $restart_from) = @_;
+
+ unless ($restart_from =~ /^([1-9][0-9]*|0)$/) {
+ print {$conn->{socket}} "501 REST command needs a numeric argument.\r\n";
+ return;
+ }
+
+ $conn->{restart} = $1;
+
+ print {$conn->{socket}} "350 Restarting next transfer at $1.\r\n";
+}
+
+sub _RETR_command
+{
+ my ($conn, $cmd, $path) = @_;
+
+ my $dir = $conn->{dir};
+
+ # Absolute path?
+ if (substr ($path, 0, 1) eq "/") {
+ $dir = "/";
+ $path =~ s,^/+,,;
+ $path = "." if $path eq "";
+ }
+
+ # Parse the first elements of path until we find the appropriate
+ # working directory.
+ my @elems = split /\//, $path;
+ my $filename = pop @elems;
+
+ foreach (@elems) {
+ if ($_ eq "" || $_ eq ".") {
+ next # Ignore these.
+ } elsif ($_ eq "..") {
+ # Go to parent directory.
+ unless ($dir eq "/") {
+ $dir = substr ($dir, 0, rindex ($dir, "/"));
+ }
+ } else {
+ unless (-d $conn->{rootdir} . $dir . $_) {
+ print {$conn->{socket}} "550 File or directory not found.\r\n";
+ return;
+ }
+ $dir .= $_;
+ }
+ }
+
+ unless (defined $filename && length $filename) {
+ print {$conn->{socket}} "550 File or directory not found.\r\n";
+ return;
+ }
+
+ if ($filename eq "." || $filename eq "..") {
+ print {$conn->{socket}} "550 RETR command is not supported on directories.\r\n";
+ return;
+ }
+
+ my $fullname = $conn->{rootdir} . $dir . $filename;
+ unless (-f $fullname) {
+ print {$conn->{socket}} "550 RETR command is only supported on plain files.\r\n";
+ return;
+ }
+
+ # Try to open the file.
+ unless (open (FILE, '<', $fullname)) {
+ print {$conn->{socket}} "550 File or directory not found.\r\n";
+ return;
+ }
+
+ print {$conn->{socket}} "150 Opening " .
+ ($conn->{type} eq 'A' ? "ASCII mode" : "BINARY mode") .
+ " data connection for file $filename.\r\n";
+
+ # Open a path back to the client.
+ my $sock = __open_data_connection ($conn);
+
+ unless ($sock) {
+ print {$conn->{socket}} "425 Can't open data connection.\r\n";
+ return;
+ }
+
+ # What mode are we sending this file in?
+ unless ($conn->{type} eq 'A') # Binary type.
+ {
+ my ($r, $buffer, $n, $w);
+
+ # Restart the connection from previous point?
+ if ($conn->{restart}) {
+ # VFS seek method only required to support relative forward seeks
+ #
+ # In Perl = 5.00503, SEEK_CUR is exported by IO::Seekable,
+ # in Perl >= 5.6, SEEK_CUR is exported by both IO::Seekable
+ # and Fcntl. Hence we 'use IO::Seekable' at the top of the
+ # file to get this symbol reliably in both cases.
+ sysseek (FILE, $conn->{restart}, SEEK_CUR);
+ $conn->{restart} = 0;
+ }
+
+ # Copy data.
+ while ($r = sysread (FILE, $buffer, 65536))
+ {
+ # Restart alarm clock timer.
+ alarm $conn->{idle_timeout};
+
+ for ($n = 0; $n < $r; )
+ {
+ $w = syswrite ($sock, $buffer, $r - $n, $n);
+
+ # Cleanup and exit if there was an error.
+ unless (defined $w) {
+ close $sock;
+ close FILE;
+ print {$conn->{socket}} "426 File retrieval error: $!. Data connection has been closed.\r\n";
+ return;
+ }
+
+ $n += $w;
+ }
+
+ # Transfer aborted by client?
+ if ($GOT_SIGURG) {
+ $GOT_SIGURG = 0;
+ close $sock;
+ close FILE;
+ print {$conn->{socket}} "426 Transfer aborted. Data connection closed.\r\n";
+ return;
+ }
+ }
+
+ # Cleanup and exit if there was an error.
+ unless (defined $r) {
+ close $sock;
+ close FILE;
+ print {$conn->{socket}} "426 File retrieval error: $!. Data connection has been closed.\r\n";
+ return;
+ }
+ } else { # ASCII type.
+ # Restart the connection from previous point?
+ if ($conn->{restart}) {
+ for (my $i = 0; $i < $conn->{restart}; ++$i) {
+ getc FILE;
+ }
+ $conn->{restart} = 0;
+ }
+
+ # Copy data.
+ while (defined ($_ = <FILE>)) {
+ # Remove any native line endings.
+ s/[\n\r]+$//;
+
+ # Restart alarm clock timer.
+ alarm $conn->{idle_timeout};
+
+ # Write the line with telnet-format line endings.
+ print $sock "$_\r\n";
+
+ # Transfer aborted by client?
+ if ($GOT_SIGURG) {
+ $GOT_SIGURG = 0;
+ close $sock;
+ close FILE;
+ print {$conn->{socket}} "426 Transfer aborted. Data connection closed.\r\n";
+ return;
+ }
+ }
+ }
+
+ unless (close ($sock) && close (FILE)) {
+ print {$conn->{socket}} "550 File retrieval error: $!.\r\n";
+ return;
+ }
+
+ print {$conn->{socket}} "226 File retrieval complete. Data connection has been closed.\r\n";
+}
+
+sub _SIZE_command
+{
+ my ($conn, $cmd, $path) = @_;
+
+ my $dir = $conn->{dir};
+
+ # Absolute path?
+ if (substr ($path, 0, 1) eq "/") {
+ $dir = "/";
+ $path =~ s,^/+,,;
+ $path = "." if $path eq "";
+ }
+
+ # Parse the first elements of path until we find the appropriate
+ # working directory.
+ my @elems = split /\//, $path;
+ my $filename = pop @elems;
+
+ foreach (@elems) {
+ if ($_ eq "" || $_ eq ".") {
+ next # Ignore these.
+ } elsif ($_ eq "..") {
+ # Go to parent directory.
+ unless ($dir eq "/") {
+ $dir = substr ($dir, 0, rindex ($dir, "/"));
+ }
+ } else {
+ unless (-d $conn->{rootdir} . $dir . $_) {
+ print {$conn->{socket}} "550 File or directory not found.\r\n";
+ return;
+ }
+ $dir .= $_;
+ }
+ }
+
+ unless (defined $filename && length $filename) {
+ print {$conn->{socket}} "550 File or directory not found.\r\n";
+ return;
+ }
+
+ if ($filename eq "." || $filename eq "..") {
+ print {$conn->{socket}} "550 SIZE command is not supported on directories.\r\n";
+ return;
+ }
+
+ my $fullname = $conn->{rootdir} . $dir . $filename;
+ unless (-f $fullname) {
+ print {$conn->{socket}} "550 SIZE command is only supported on plain files.\r\n";
+ return;
+ }
+
+ my $size = 0;
+ if ($conn->{type} eq 'A') {
+ # ASCII mode: we have to count the characters by hand.
+ unless (open (FILE, '<', $filename)) {
+ print {$conn->{socket}} "550 Cannot calculate size of $filename.\r\n";
+ return;
+ }
+ $size++ while (defined (getc(FILE)));
+ close FILE;
+ } else {
+ # BINARY mode: we can use stat
+ $size = (stat($filename))[7];
+ }
+
+ print {$conn->{socket}} "213 $size\r\n";
+}
+
+sub _SYST_command
+{
+ my ($conn, $cmd, $dummy) = @_;
+
+ print {$conn->{socket}} "215 UNIX Type: L8\r\n";
+}
+
+sub _TYPE_command
+{
+ my ($conn, $cmd, $type) = @_;
+
+ # See RFC 959 section 5.3.2.
+ if ($type =~ /^([AI])$/i) {
+ $conn->{type} = 'A';
+ } elsif ($type =~ /^([AI])\sN$/i) {
+ $conn->{type} = 'A';
+ } elsif ($type =~ /^L\s8$/i) {
+ $conn->{type} = 'L8';
+ } else {
+ print {$conn->{socket}} "504 This server does not support TYPE $type.\r\n";
+ return;
+ }
+
+ print {$conn->{socket}} "200 TYPE changed to $type.\r\n";
+}
+
+sub _USER_command
+{
+ my ($conn, $cmd, $username) = @_;
+
+ print STDERR "username: $username\n" if $log;
+ $conn->{username} = $username;
+
+ print STDERR "switching to WAIT4PWD state\n" if $log;
+ $conn->{state} = $_connection_states{WAIT4PWD};
+
+ if ($conn->{username} eq "anonymous") {
+ print {$conn->{socket}} "230 Anonymous user access granted.\r\n";
+ } else {
+ print {$conn->{socket}} "331 Password required.\r\n";
+ }
+}
+
+
+# HELPER ROUTINES
+
+sub __open_data_connection
+{
+ my $conn = shift;
+
+ my $sock;
+
+ if ($conn->{passive}) {
+ # Passive mode - wait for a connection from the client.
+ accept ($sock, $conn->{passive_socket}) or return undef;
+ } else {
+ # Active mode - connect back to the client.
+ "0" =~ /(0)/; # Perl 5.7 / IO::Socket::INET bug workaround.
+ $sock = IO::Socket::INET->new (LocalAddr => '127.0.0.1',
+ PeerAddr => $conn->{peeraddrstring},
+ PeerPort => $conn->{peerport},
+ Proto => 'tcp',
+ Type => SOCK_STREAM) or return undef;
+ }
+
+ return $sock;
+}
+
+
+sub __list_file
+{
+ my $sock = shift;
+ my $filename = shift;
+
+ # Get the status information.
+ my ($dev, $ino, $mode, $nlink, $uid, $gid, $rdev, $size,
+ $atime, $mtime, $ctime, $blksize, $blocks)
+ = lstat $filename;
+
+ # If the file has been removed since we created this
+ # handle, then $dev will be undefined. Return immediately.
+ return unless defined $dev;
+
+ # Generate printable user/group.
+ my $user = getpwuid ($uid) || "-";
+ my $group = getgrgid ($gid) || "-";
+
+ # Permissions from mode.
+ my $perms = $mode & 0777;
+
+ # Work out the mode using special "_" operator which causes Perl
+ # to use the result of the previous stat call.
+ $mode = (-f _ ? 'f' :
+ (-d _ ? 'd' :
+ (-l _ ? 'l' :
+ (-p _ ? 'p' :
+ (-S _ ? 's' :
+ (-b _ ? 'b' :
+ (-c _ ? 'c' : '?')))))));
+
+ # Generate printable date (this logic is taken from GNU fileutils:
+ # src/ls.c: print_long_format).
+ my $time = time;
+ my $fmt;
+ if ($time > $mtime + 6 * 30 * 24 * 60 * 60 || $time < $mtime - 60 * 60) {
+ $fmt = "%b %e %Y";
+ } else {
+ $fmt = "%b %e %H:%M";
+ }
+
+ my $fmt_time = strftime $fmt, localtime ($mtime);
+
+ # Generate printable permissions.
+ my $fmt_perms = join "",
+ ($perms & 0400 ? 'r' : '-'),
+ ($perms & 0200 ? 'w' : '-'),
+ ($perms & 0100 ? 'x' : '-'),
+ ($perms & 040 ? 'r' : '-'),
+ ($perms & 020 ? 'w' : '-'),
+ ($perms & 010 ? 'x' : '-'),
+ ($perms & 04 ? 'r' : '-'),
+ ($perms & 02 ? 'w' : '-'),
+ ($perms & 01 ? 'x' : '-');
+
+ # Printable file type.
+ my $fmt_mode = $mode eq 'f' ? '-' : $mode;
+
+ # If it's a symbolic link, display the link.
+ my $link;
+ if ($mode eq 'l') {
+ $link = readlink $filename;
+ die "readlink: $!" unless defined $link;
+ }
+ my $fmt_link = defined $link ? " -> $link" : "";
+
+ # Display the file.
+ my $line = sprintf
+ ("%s%s%4d %-8s %-8s %8d %s %s%s\r\n",
+ $fmt_mode,
+ $fmt_perms,
+ $nlink,
+ $user,
+ $group,
+ $size,
+ $fmt_time,
+ $filename,
+ $fmt_link);
+ $sock->print ($line);
+}
+
+
+sub __get_file_list
+{
+ my $dir = shift;
+ my $wildcard = shift;
+
+ opendir (DIRHANDLE, $dir)
+ or die "Cannot open directory!!!";
+
+ my @allfiles = readdir DIRHANDLE;
+ my @filenames = ();
+
+ if ($wildcard) {
+ # Get rid of . and ..
+ @allfiles = grep !/^\.{1,2}$/, @allfiles;
+
+ # Convert wildcard to a regular expression.
+ $wildcard = __wildcard_to_regex ($wildcard);
+
+ @filenames = grep /$wildcard/, @allfiles;
+ } else {
+ @filenames = @allfiles;
+ }
+
+ closedir (DIRHANDLE);
+
+ return sort @filenames;
+}
+
+
+sub __wildcard_to_regex
+{
+ my $wildcard = shift;
+
+ $wildcard =~ s,([^?*a-zA-Z0-9]),\\$1,g; # Escape punctuation.
+ $wildcard =~ s,\*,.*,g; # Turn * into .*
+ $wildcard =~ s,\?,.,g; # Turn ? into .
+ $wildcard = "^$wildcard\$"; # Bracket it.
+
+ return $wildcard;
+}
+
+
+###########################################################################
+# FTPSERVER CLASS
+###########################################################################
+
+{
+ my %_attr_data = ( # DEFAULT
+ _localAddr => 'localhost',
+ _localPort => 8021,
+ _reuseAddr => 1,
+ _rootDir => Cwd::getcwd(),
+ );
+
+ sub _default_for
+ {
+ my ($self, $attr) = @_;
+ $_attr_data{$attr};
+ }
+
+ sub _standard_keys
+ {
+ keys %_attr_data;
+ }
+}
+
+
+sub new {
+ my ($caller, %args) = @_;
+ my $caller_is_obj = ref($caller);
+ my $class = $caller_is_obj || $caller;
+ my $self = bless {}, $class;
+ foreach my $attrname ($self->_standard_keys()) {
+ my ($argname) = ($attrname =~ /^_(.*)/);
+ if (exists $args{$argname}) {
+ $self->{$attrname} = $args{$argname};
+ } elsif ($caller_is_obj) {
+ $self->{$attrname} = $caller->{$attrname};
+ } else {
+ $self->{$attrname} = $self->_default_for($attrname);
+ }
+ }
+ return $self;
+}
+
+
+sub run
+{
+ my ($self, $synch_callback) = @_;
+ my $initialized = 0;
+
+ # turn buffering off on STDERR
+ select((select(STDERR), $|=1)[0]);
+
+ # initialize command table
+ my $command_table = {};
+ foreach (keys %_commands) {
+ my $subname = "_${_}_command";
+ $command_table->{$_} = \&$subname;
+ }
+
+ my $old_ils = $/;
+ $/ = "\r\n";
+
+ # create server socket
+ "0" =~ /(0)/; # Perl 5.7 / IO::Socket::INET bug workaround.
+ my $server_sock = IO::Socket::INET->new (LocalHost => $self->{_localAddr},
+ LocalPort => $self->{_localPort},
+ Listen => 1,
+ Reuse => $self->{_reuseAddr},
+ Proto => 'tcp',
+ Type => SOCK_STREAM) or die "bind: $!";
+
+ if (!$initialized) {
+ $synch_callback->();
+ $initialized = 1;
+ }
+
+ $SIG{CHLD} = sub { wait };
+
+ # the accept loop
+ while (my $client_addr = accept (my $socket, $server_sock))
+ {
+ # turn buffering off on $socket
+ select((select($socket), $|=1)[0]);
+
+ # find out who connected
+ my ($client_port, $client_ip) = sockaddr_in ($client_addr);
+ my $client_ipnum = inet_ntoa ($client_ip);
+
+ # print who connected
+ print STDERR "got a connection from: $client_ipnum\n" if $log;
+
+ # fork off a process to handle this connection.
+ my $pid = fork();
+ unless (defined $pid) {
+ warn "fork: $!";
+ sleep 5; # Back off in case system is overloaded.
+ next;
+ }
+
+ if ($pid == 0) { # Child process.
+
+ # install signals
+ $SIG{URG} = sub {
+ $GOT_SIGURG = 1;
+ };
+
+ $SIG{PIPE} = sub {
+ print STDERR "Client closed connection abruptly.\n";
+ exit;
+ };
+
+ $SIG{ALRM} = sub {
+ print STDERR "Connection idle timeout expired. Closing server.\n";
+ exit;
+ };
+
+ #$SIG{CHLD} = 'IGNORE';
+
+
+ print STDERR "in child\n" if $log;
+
+ my $conn = {
+ 'socket' => $socket,
+ 'state' => $_connection_states{NEWCONN},
+ 'dir' => '/',
+ 'restart' => 0,
+ 'idle_timeout' => 60, # 1 minute timeout
+ 'rootdir' => $self->{_rootDir},
+ };
+
+ print {$conn->{socket}} "220 GNU Wget Testing FTP Server ready.\r\n";
+
+ # command handling loop
+ for (;;) {
+ print STDERR "waiting for request\n" if $log;
+
+ last unless defined (my $req = <$socket>);
+
+ # Remove trailing CRLF.
+ $req =~ s/[\n\r]+$//;
+
+ print STDERR "received request $req\n" if $log;
+
+ # Get the command.
+ # See also RFC 2640 section 3.1.
+ unless ($req =~ m/^([A-Z]{3,4})\s?(.*)/i) {
+ # badly formed command
+ exit 0;
+ }
+
+ # The following strange 'eval' is necessary to work around a
+ # very odd bug in Perl 5.6.0. The following assignment to
+ # $cmd will fail in some cases unless you use $1 in some sort
+ # of an expression beforehand.
+ # - RWMJ 2002-07-05.
+ eval '$1 eq $1';
+
+ my ($cmd, $rest) = (uc $1, $2);
+
+ # Got a command which matches in the table?
+ unless (exists $command_table->{$cmd}) {
+ print {$conn->{socket}} "500 Unrecognized command.\r\n";
+ next;
+ }
+
+ # Command requires user to be authenticated?
+ unless ($_commands{$cmd} | $conn->{state}) {
+ print {$conn->{socket}} "530 Not logged in.\r\n";
+ next;
+ }
+
+ # Handle the QUIT command specially.
+ if ($cmd eq "QUIT") {
+ print {$conn->{socket}} "221 Goodbye. Service closing connection.\r\n";
+ last;
+ }
+
+ # Run the command.
+ &{$command_table->{$cmd}} ($conn, $cmd, $rest);
+ }
+ } else { # Father
+ close $socket;
+ }
+ }
+
+ $/ = $old_ils;
+}
+
+1;
+
+# vim: et ts=4 sw=4
+
projects / wget / commitdiff