PAL.C.T MINI SHELL
#!/usr/bin/perl
# Pass data from stdin to an FTP server
$no_acl_check++;
require './fsdump-lib.pl';
# Parse args, and get password
select(STDERR); $| = 1; select(STDOUT);
$host = $ARGV[0];
$user = $ARGV[2];
if ($ARGV[3] =~ /touch/) {
$touched = 1;
}
$| = 1;
if (defined($ENV{'DUMP_PASSWORD'})) {
$pass = $ENV{'DUMP_PASSWORD'};
}
else {
open(TTY, "+</dev/tty");
print TTY "Password: ";
$pass = <TTY>;
$pass =~ s/\r|\n//g;
close(TTY);
}
# Read rmt protocol messages
while(1) {
$line = <STDIN>;
$line =~ s/\r|\n//g;
if ($line =~ /^O(.*)/) {
# File to open specified .. connect to FTP server
$file = $1;
$perms = <STDIN>;
$perms = int($perms);
&open_socket($host, 21, "SOCK", \$err);
&error_exit("FTP connection failed : $err") if ($err);
&ftp_command("", 2, \$err) ||
&error_exit("FTP prompt failed : $err");
# Login to server
@urv = &ftp_command("USER $user", [ 2, 3 ], \$err);
@urv || &error_exit("FTP login failed : $err");
if (int($urv[1]/100) == 3) {
&ftp_command("PASS $pass", 2, \$err) ||
&error_exit("FTP login failed : $err");
}
&ftp_command("TYPE I", 2, \$err) ||
&error_exit("FTP file type failed : $err");
# Work out what we are doing
$mode = 0;
if (($perms & 0100) || ($perms & 01000) ||
(($perms & 01) || ($perms & 02)) && $touched) {
# Writing new file
$mode = 1;
}
elsif ($perms & 02000) {
# Appending to a file
$mode = 2;
}
elsif (!$perms) {
# Reading from file
$mode = 0;
}
else {
&error_exit("Unknown permissions $perms");
}
print "A0\n";
}
elsif ($line =~ /^W(\d+)/) {
# Write to FTP server
$len = $1;
if ($opened != 1) {
&open_ftp_file($mode);
}
#$opened || &error_exit("FTP connection not opened yet");
read(STDIN, $buf, $len);
$wrote = (print CON $buf);
print "A".($wrote ? $len : 0)."\n";
}
elsif ($line =~ /^R(\d+)/) {
# Read from to FTP server
if ($opened != 2) {
&open_ftp_file(0);
}
$len = $1;
$read = read(CON, $buf, $len);
if ($read >= 0) {
print "A".$read."\n";
print $buf;
}
else {
print "E",int($!),"\n";
print "Read failed : $!\n";
}
}
elsif ($line =~ /^C/) {
# Close FTP connection
if ($opened) {
# Finish transfer
close(CON);
&ftp_command("", 2, \$err) ||
&error_exit("FTP close failed : $err");
}
&ftp_command("QUIT", 2, \$err) ||
&error_exit("FTP quit failed : $err");
close(SOCK);
print "A0\n";
$opened = 0;
}
elsif (!$line) {
# All done!
last;
}
else {
print "E1\nUnknown command $line\n";
}
}
sub error_exit
{
local $err = &html_tags_to_text(join("", @_));
print STDERR $err,"\n";
print "E1\n$err\n";
exit(1);
}
sub html_tags_to_text
{
local ($rv) = @_;
$rv =~ s/<tt>|<\/tt>//g;
$rv =~ s/<b>|<\/b>//g;
$rv =~ s/<i>|<\/i>//g;
$rv =~ s/<u>|<\/u>//g;
$rv =~ s/<pre>|<\/pre>//g;
$rv =~ s/<br>/\n/g;
$rv =~ s/<p>/\n\n/g;
return $rv;
}
sub open_ftp_file
{
local ($mode) = @_;
# Open passive port
local $pasv = &ftp_command("PASV", 2, \$err);
$pasv || &error_exit("FTP port failed : $err");
$pasv =~ /\(([0-9,]+)\)/;
local @n = split(/,/ , $1);
&open_socket("$n[0].$n[1].$n[2].$n[3]", $n[4]*256 + $n[5],
CON, \$err) ||
&error_exit("FTP port failed : $err");
if ($mode == 0) {
# Read from file
&ftp_command("RETR $file", 1, \$err) ||
&error_exit("FTP read failed : $err");
$opened = 2;
}
elsif ($mode == 1) {
# Create new file if requested by the client, or if
# the touch command was specified by the caller
&ftp_command("STOR $file", 1, \$err) ||
&error_exit("FTP write failed : $err");
$touched = 0;
$opened = 1;
}
elsif ($mode == 2) {
# Otherwise append to the file
&ftp_command("APPE $file", 1, \$err) ||
&error_exit("FTP write failed : $err");
$opened = 1;
}
else {
$opened = 0;
}
}
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