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f92f3fcb |
1 | # Net::Cmd.pm $Id: //depot/libnet/Net/Cmd.pm#34 $ |
406c51ee |
2 | # |
3 | # Copyright (c) 1995-1997 Graham Barr <gbarr@pobox.com>. All rights reserved. |
4 | # This program is free software; you can redistribute it and/or |
5 | # modify it under the same terms as Perl itself. |
6 | |
7 | package Net::Cmd; |
8 | |
9 | require 5.001; |
10 | require Exporter; |
11 | |
12 | use strict; |
13 | use vars qw(@ISA @EXPORT $VERSION); |
14 | use Carp; |
12df23ee |
15 | use Symbol 'gensym'; |
406c51ee |
16 | |
686337f3 |
17 | BEGIN { |
18 | if ($^O eq 'os390') { |
19 | require Convert::EBCDIC; |
20 | # Convert::EBCDIC->import; |
21 | } |
22 | } |
23 | |
df76848e |
24 | $VERSION = "2.26_01"; |
406c51ee |
25 | @ISA = qw(Exporter); |
26 | @EXPORT = qw(CMD_INFO CMD_OK CMD_MORE CMD_REJECT CMD_ERROR CMD_PENDING); |
27 | |
28 | sub CMD_INFO { 1 } |
29 | sub CMD_OK { 2 } |
30 | sub CMD_MORE { 3 } |
31 | sub CMD_REJECT { 4 } |
32 | sub CMD_ERROR { 5 } |
33 | sub CMD_PENDING { 0 } |
34 | |
35 | my %debug = (); |
36 | |
686337f3 |
37 | my $tr = $^O eq 'os390' ? Convert::EBCDIC->new() : undef; |
38 | |
39 | sub toebcdic |
40 | { |
41 | my $cmd = shift; |
42 | |
43 | unless (exists ${*$cmd}{'net_cmd_asciipeer'}) |
44 | { |
45 | my $string = $_[0]; |
46 | my $ebcdicstr = $tr->toebcdic($string); |
47 | ${*$cmd}{'net_cmd_asciipeer'} = $string !~ /^\d+/ && $ebcdicstr =~ /^\d+/; |
48 | } |
49 | |
50 | ${*$cmd}{'net_cmd_asciipeer'} |
51 | ? $tr->toebcdic($_[0]) |
52 | : $_[0]; |
53 | } |
54 | |
55 | sub toascii |
56 | { |
57 | my $cmd = shift; |
58 | ${*$cmd}{'net_cmd_asciipeer'} |
59 | ? $tr->toascii($_[0]) |
60 | : $_[0]; |
61 | } |
62 | |
406c51ee |
63 | sub _print_isa |
64 | { |
65 | no strict qw(refs); |
66 | |
67 | my $pkg = shift; |
68 | my $cmd = $pkg; |
69 | |
70 | $debug{$pkg} ||= 0; |
71 | |
72 | my %done = (); |
73 | my @do = ($pkg); |
74 | my %spc = ( $pkg , ""); |
75 | |
406c51ee |
76 | while ($pkg = shift @do) |
77 | { |
78 | next if defined $done{$pkg}; |
79 | |
80 | $done{$pkg} = 1; |
81 | |
82 | my $v = defined ${"${pkg}::VERSION"} |
83 | ? "(" . ${"${pkg}::VERSION"} . ")" |
84 | : ""; |
85 | |
86 | my $spc = $spc{$pkg}; |
edd55068 |
87 | $cmd->debug_print(1,"${spc}${pkg}${v}\n"); |
406c51ee |
88 | |
89 | if(@{"${pkg}::ISA"}) |
90 | { |
91 | @spc{@{"${pkg}::ISA"}} = (" " . $spc{$pkg}) x @{"${pkg}::ISA"}; |
92 | unshift(@do, @{"${pkg}::ISA"}); |
93 | } |
94 | } |
406c51ee |
95 | } |
96 | |
97 | sub debug |
98 | { |
99 | @_ == 1 or @_ == 2 or croak 'usage: $obj->debug([LEVEL])'; |
100 | |
101 | my($cmd,$level) = @_; |
102 | my $pkg = ref($cmd) || $cmd; |
103 | my $oldval = 0; |
104 | |
105 | if(ref($cmd)) |
106 | { |
107 | $oldval = ${*$cmd}{'net_cmd_debug'} || 0; |
108 | } |
109 | else |
110 | { |
111 | $oldval = $debug{$pkg} || 0; |
112 | } |
113 | |
114 | return $oldval |
115 | unless @_ == 2; |
116 | |
117 | $level = $debug{$pkg} || 0 |
118 | unless defined $level; |
119 | |
120 | _print_isa($pkg) |
121 | if($level && !exists $debug{$pkg}); |
122 | |
123 | if(ref($cmd)) |
124 | { |
125 | ${*$cmd}{'net_cmd_debug'} = $level; |
126 | } |
127 | else |
128 | { |
129 | $debug{$pkg} = $level; |
130 | } |
131 | |
132 | $oldval; |
133 | } |
134 | |
135 | sub message |
136 | { |
137 | @_ == 1 or croak 'usage: $obj->message()'; |
138 | |
139 | my $cmd = shift; |
140 | |
141 | wantarray ? @{${*$cmd}{'net_cmd_resp'}} |
142 | : join("", @{${*$cmd}{'net_cmd_resp'}}); |
143 | } |
144 | |
145 | sub debug_text { $_[2] } |
146 | |
147 | sub debug_print |
148 | { |
149 | my($cmd,$out,$text) = @_; |
150 | print STDERR $cmd,($out ? '>>> ' : '<<< '), $cmd->debug_text($out,$text); |
151 | } |
152 | |
153 | sub code |
154 | { |
155 | @_ == 1 or croak 'usage: $obj->code()'; |
156 | |
157 | my $cmd = shift; |
158 | |
159 | ${*$cmd}{'net_cmd_code'} = "000" |
160 | unless exists ${*$cmd}{'net_cmd_code'}; |
161 | |
162 | ${*$cmd}{'net_cmd_code'}; |
163 | } |
164 | |
165 | sub status |
166 | { |
167 | @_ == 1 or croak 'usage: $obj->status()'; |
168 | |
169 | my $cmd = shift; |
170 | |
171 | substr(${*$cmd}{'net_cmd_code'},0,1); |
172 | } |
173 | |
174 | sub set_status |
175 | { |
176 | @_ == 3 or croak 'usage: $obj->set_status(CODE, MESSAGE)'; |
177 | |
178 | my $cmd = shift; |
179 | my($code,$resp) = @_; |
180 | |
181 | $resp = [ $resp ] |
182 | unless ref($resp); |
183 | |
184 | (${*$cmd}{'net_cmd_code'},${*$cmd}{'net_cmd_resp'}) = ($code, $resp); |
185 | |
186 | 1; |
187 | } |
188 | |
189 | sub command |
190 | { |
191 | my $cmd = shift; |
192 | |
686337f3 |
193 | unless (defined fileno($cmd)) |
194 | { |
195 | $cmd->set_status("599", "Connection closed"); |
196 | return $cmd; |
197 | } |
198 | |
199 | |
406c51ee |
200 | $cmd->dataend() |
f92f3fcb |
201 | if(exists ${*$cmd}{'net_cmd_last_ch'}); |
406c51ee |
202 | |
203 | if (scalar(@_)) |
204 | { |
686337f3 |
205 | local $SIG{PIPE} = 'IGNORE' unless $^O eq 'MacOS'; |
206 | |
207 | my $str = join(" ", map { /\n/ ? do { my $n = $_; $n =~ tr/\n/ /; $n } : $_; } @_); |
208 | $str = $cmd->toascii($str) if $tr; |
209 | $str .= "\015\012"; |
406c51ee |
210 | |
406c51ee |
211 | my $len = length $str; |
212 | my $swlen; |
686337f3 |
213 | |
406c51ee |
214 | $cmd->close |
215 | unless (defined($swlen = syswrite($cmd,$str,$len)) && $swlen == $len); |
216 | |
217 | $cmd->debug_print(1,$str) |
218 | if($cmd->debug); |
219 | |
220 | ${*$cmd}{'net_cmd_resp'} = []; # the response |
221 | ${*$cmd}{'net_cmd_code'} = "000"; # Made this one up :-) |
222 | } |
223 | |
224 | $cmd; |
225 | } |
226 | |
227 | sub ok |
228 | { |
229 | @_ == 1 or croak 'usage: $obj->ok()'; |
230 | |
231 | my $code = $_[0]->code; |
232 | 0 < $code && $code < 400; |
233 | } |
234 | |
235 | sub unsupported |
236 | { |
237 | my $cmd = shift; |
238 | |
239 | ${*$cmd}{'net_cmd_resp'} = [ 'Unsupported command' ]; |
240 | ${*$cmd}{'net_cmd_code'} = 580; |
241 | 0; |
242 | } |
243 | |
244 | sub getline |
245 | { |
246 | my $cmd = shift; |
247 | |
248 | ${*$cmd}{'net_cmd_lines'} ||= []; |
249 | |
250 | return shift @{${*$cmd}{'net_cmd_lines'}} |
251 | if scalar(@{${*$cmd}{'net_cmd_lines'}}); |
252 | |
253 | my $partial = defined(${*$cmd}{'net_cmd_partial'}) |
254 | ? ${*$cmd}{'net_cmd_partial'} : ""; |
255 | my $fd = fileno($cmd); |
686337f3 |
256 | |
406c51ee |
257 | return undef |
258 | unless defined $fd; |
259 | |
260 | my $rin = ""; |
261 | vec($rin,$fd,1) = 1; |
262 | |
263 | my $buf; |
264 | |
265 | until(scalar(@{${*$cmd}{'net_cmd_lines'}})) |
266 | { |
267 | my $timeout = $cmd->timeout || undef; |
268 | my $rout; |
269 | if (select($rout=$rin, undef, undef, $timeout)) |
270 | { |
271 | unless (sysread($cmd, $buf="", 1024)) |
272 | { |
273 | carp(ref($cmd) . ": Unexpected EOF on command channel") |
274 | if $cmd->debug; |
275 | $cmd->close; |
276 | return undef; |
277 | } |
278 | |
279 | substr($buf,0,0) = $partial; ## prepend from last sysread |
280 | |
281 | my @buf = split(/\015?\012/, $buf, -1); ## break into lines |
282 | |
283 | $partial = pop @buf; |
284 | |
285 | push(@{${*$cmd}{'net_cmd_lines'}}, map { "$_\n" } @buf); |
286 | |
287 | } |
288 | else |
289 | { |
290 | carp("$cmd: Timeout") if($cmd->debug); |
291 | return undef; |
292 | } |
293 | } |
294 | |
295 | ${*$cmd}{'net_cmd_partial'} = $partial; |
296 | |
686337f3 |
297 | if ($tr) |
298 | { |
299 | foreach my $ln (@{${*$cmd}{'net_cmd_lines'}}) |
300 | { |
301 | $ln = $cmd->toebcdic($ln); |
302 | } |
303 | } |
304 | |
406c51ee |
305 | shift @{${*$cmd}{'net_cmd_lines'}}; |
306 | } |
307 | |
308 | sub ungetline |
309 | { |
310 | my($cmd,$str) = @_; |
311 | |
312 | ${*$cmd}{'net_cmd_lines'} ||= []; |
313 | unshift(@{${*$cmd}{'net_cmd_lines'}}, $str); |
314 | } |
315 | |
316 | sub parse_response |
317 | { |
318 | return () |
319 | unless $_[1] =~ s/^(\d\d\d)(.?)//o; |
320 | ($1, $2 eq "-"); |
321 | } |
322 | |
323 | sub response |
324 | { |
325 | my $cmd = shift; |
326 | my($code,$more) = (undef) x 2; |
327 | |
328 | ${*$cmd}{'net_cmd_resp'} ||= []; |
329 | |
330 | while(1) |
331 | { |
332 | my $str = $cmd->getline(); |
333 | |
334 | return CMD_ERROR |
335 | unless defined($str); |
336 | |
337 | $cmd->debug_print(0,$str) |
338 | if ($cmd->debug); |
339 | |
340 | ($code,$more) = $cmd->parse_response($str); |
341 | unless(defined $code) |
342 | { |
343 | $cmd->ungetline($str); |
344 | last; |
345 | } |
346 | |
347 | ${*$cmd}{'net_cmd_code'} = $code; |
348 | |
349 | push(@{${*$cmd}{'net_cmd_resp'}},$str); |
350 | |
351 | last unless($more); |
352 | } |
353 | |
354 | substr($code,0,1); |
355 | } |
356 | |
357 | sub read_until_dot |
358 | { |
359 | my $cmd = shift; |
360 | my $fh = shift; |
361 | my $arr = []; |
362 | |
363 | while(1) |
364 | { |
365 | my $str = $cmd->getline() or return undef; |
366 | |
367 | $cmd->debug_print(0,$str) |
368 | if ($cmd->debug & 4); |
369 | |
370 | last if($str =~ /^\.\r?\n/o); |
371 | |
372 | $str =~ s/^\.\././o; |
373 | |
374 | if (defined $fh) |
375 | { |
376 | print $fh $str; |
377 | } |
378 | else |
379 | { |
380 | push(@$arr,$str); |
381 | } |
382 | } |
383 | |
384 | $arr; |
385 | } |
386 | |
387 | sub datasend |
388 | { |
389 | my $cmd = shift; |
390 | my $arr = @_ == 1 && ref($_[0]) ? $_[0] : \@_; |
391 | my $line = join("" ,@$arr); |
392 | |
393 | return 0 unless defined(fileno($cmd)); |
394 | |
f92f3fcb |
395 | my $last_ch = ${*$cmd}{'net_cmd_last_ch'}; |
396 | $last_ch = ${*$cmd}{'net_cmd_last_ch'} = "\012" unless defined $last_ch; |
397 | |
398 | return 1 unless length $line; |
406c51ee |
399 | |
edd55068 |
400 | if($cmd->debug) { |
401 | foreach my $b (split(/\n/,$line)) { |
402 | $cmd->debug_print(1, "$b\n"); |
403 | } |
406c51ee |
404 | } |
405 | |
dea4d7df |
406 | $line =~ tr/\r\n/\015\012/ unless "\r" eq "\015"; |
406c51ee |
407 | |
f92f3fcb |
408 | my $first_ch = ''; |
409 | |
410 | if ($last_ch eq "\015") { |
411 | $first_ch = "\012" if $line =~ s/^\012//; |
412 | } |
413 | elsif ($last_ch eq "\012") { |
414 | $first_ch = "." if $line =~ /^\./; |
415 | } |
416 | |
417 | $line =~ s/\015?\012(\.?)/\015\012$1$1/sg; |
406c51ee |
418 | |
f92f3fcb |
419 | substr($line,0,0) = $first_ch; |
420 | |
421 | ${*$cmd}{'net_cmd_last_ch'} = substr($line,-1,1); |
406c51ee |
422 | |
dea4d7df |
423 | my $len = length($line); |
424 | my $offset = 0; |
406c51ee |
425 | my $win = ""; |
426 | vec($win,fileno($cmd),1) = 1; |
427 | my $timeout = $cmd->timeout || undef; |
428 | |
dea4d7df |
429 | local $SIG{PIPE} = 'IGNORE' unless $^O eq 'MacOS'; |
430 | |
406c51ee |
431 | while($len) |
432 | { |
433 | my $wout; |
df76848e |
434 | my $s = select(undef,$wout=$win, undef, $timeout); |
435 | if ((defined $s and $s > 0) or -f $cmd) # -f for testing on win32 |
406c51ee |
436 | { |
437 | my $w = syswrite($cmd, $line, $len, $offset); |
438 | unless (defined($w)) |
439 | { |
440 | carp("$cmd: $!") if $cmd->debug; |
441 | return undef; |
442 | } |
443 | $len -= $w; |
444 | $offset += $w; |
445 | } |
446 | else |
447 | { |
448 | carp("$cmd: Timeout") if($cmd->debug); |
449 | return undef; |
450 | } |
451 | } |
452 | |
453 | 1; |
454 | } |
455 | |
dea4d7df |
456 | sub rawdatasend |
406c51ee |
457 | { |
458 | my $cmd = shift; |
dea4d7df |
459 | my $arr = @_ == 1 && ref($_[0]) ? $_[0] : \@_; |
460 | my $line = join("" ,@$arr); |
406c51ee |
461 | |
462 | return 0 unless defined(fileno($cmd)); |
463 | |
464 | return 1 |
dea4d7df |
465 | unless length($line); |
406c51ee |
466 | |
dea4d7df |
467 | if($cmd->debug) |
406c51ee |
468 | { |
dea4d7df |
469 | my $b = "$cmd>>> "; |
470 | print STDERR $b,join("\n$b",split(/\n/,$line)),"\n"; |
406c51ee |
471 | } |
dea4d7df |
472 | |
473 | my $len = length($line); |
474 | my $offset = 0; |
475 | my $win = ""; |
476 | vec($win,fileno($cmd),1) = 1; |
477 | my $timeout = $cmd->timeout || undef; |
478 | |
479 | local $SIG{PIPE} = 'IGNORE' unless $^O eq 'MacOS'; |
480 | while($len) |
406c51ee |
481 | { |
dea4d7df |
482 | my $wout; |
483 | if (select(undef,$wout=$win, undef, $timeout) > 0) |
484 | { |
485 | my $w = syswrite($cmd, $line, $len, $offset); |
486 | unless (defined($w)) |
487 | { |
488 | carp("$cmd: $!") if $cmd->debug; |
489 | return undef; |
490 | } |
491 | $len -= $w; |
492 | $offset += $w; |
493 | } |
494 | else |
495 | { |
496 | carp("$cmd: Timeout") if($cmd->debug); |
497 | return undef; |
498 | } |
406c51ee |
499 | } |
500 | |
dea4d7df |
501 | 1; |
502 | } |
503 | |
504 | sub dataend |
505 | { |
506 | my $cmd = shift; |
507 | |
508 | return 0 unless defined(fileno($cmd)); |
509 | |
f92f3fcb |
510 | my $ch = ${*$cmd}{'net_cmd_last_ch'}; |
511 | my $tosend; |
512 | |
513 | if (!defined $ch) { |
514 | return 1; |
515 | } |
516 | elsif ($ch ne "\012") { |
517 | $tosend = "\015\012"; |
518 | } |
519 | |
520 | $tosend .= ".\015\012"; |
dea4d7df |
521 | |
522 | local $SIG{PIPE} = 'IGNORE' unless $^O eq 'MacOS'; |
dea4d7df |
523 | |
edd55068 |
524 | $cmd->debug_print(1, ".\n") |
406c51ee |
525 | if($cmd->debug); |
526 | |
f92f3fcb |
527 | syswrite($cmd,$tosend, length $tosend); |
406c51ee |
528 | |
f92f3fcb |
529 | delete ${*$cmd}{'net_cmd_last_ch'}; |
406c51ee |
530 | |
531 | $cmd->response() == CMD_OK; |
532 | } |
533 | |
12df23ee |
534 | # read and write to tied filehandle |
535 | sub tied_fh { |
536 | my $cmd = shift; |
537 | ${*$cmd}{'net_cmd_readbuf'} = ''; |
538 | my $fh = gensym(); |
539 | tie *$fh,ref($cmd),$cmd; |
540 | return $fh; |
541 | } |
542 | |
543 | # tie to myself |
544 | sub TIEHANDLE { |
545 | my $class = shift; |
546 | my $cmd = shift; |
547 | return $cmd; |
548 | } |
549 | |
550 | # Tied filehandle read. Reads requested data length, returning |
551 | # end-of-file when the dot is encountered. |
552 | sub READ { |
553 | my $cmd = shift; |
edd55068 |
554 | my ($len,$offset) = @_[1,2]; |
12df23ee |
555 | return unless exists ${*$cmd}{'net_cmd_readbuf'}; |
556 | my $done = 0; |
557 | while (!$done and length(${*$cmd}{'net_cmd_readbuf'}) < $len) { |
558 | ${*$cmd}{'net_cmd_readbuf'} .= $cmd->getline() or return; |
559 | $done++ if ${*$cmd}{'net_cmd_readbuf'} =~ s/^\.\r?\n\Z//m; |
560 | } |
561 | |
562 | $_[0] = ''; |
563 | substr($_[0],$offset+0) = substr(${*$cmd}{'net_cmd_readbuf'},0,$len); |
564 | substr(${*$cmd}{'net_cmd_readbuf'},0,$len) = ''; |
565 | delete ${*$cmd}{'net_cmd_readbuf'} if $done; |
566 | |
567 | return length $_[0]; |
568 | } |
569 | |
570 | sub READLINE { |
571 | my $cmd = shift; |
572 | # in this context, we use the presence of readbuf to |
573 | # indicate that we have not yet reached the eof |
574 | return unless exists ${*$cmd}{'net_cmd_readbuf'}; |
575 | my $line = $cmd->getline; |
576 | return if $line =~ /^\.\r?\n/; |
577 | $line; |
578 | } |
579 | |
580 | sub PRINT { |
581 | my $cmd = shift; |
582 | my ($buf,$len,$offset) = @_; |
583 | $len ||= length ($buf); |
584 | $offset += 0; |
585 | return unless $cmd->datasend(substr($buf,$offset,$len)); |
586 | ${*$cmd}{'net_cmd_sending'}++; # flag that we should call dataend() |
587 | return $len; |
588 | } |
589 | |
590 | sub CLOSE { |
591 | my $cmd = shift; |
592 | my $r = exists(${*$cmd}{'net_cmd_sending'}) ? $cmd->dataend : 1; |
593 | delete ${*$cmd}{'net_cmd_readbuf'}; |
594 | delete ${*$cmd}{'net_cmd_sending'}; |
595 | $r; |
596 | } |
597 | |
406c51ee |
598 | 1; |
599 | |
600 | __END__ |
601 | |
602 | |
603 | =head1 NAME |
604 | |
605 | Net::Cmd - Network Command class (as used by FTP, SMTP etc) |
606 | |
607 | =head1 SYNOPSIS |
608 | |
609 | use Net::Cmd; |
686337f3 |
610 | |
406c51ee |
611 | @ISA = qw(Net::Cmd); |
612 | |
613 | =head1 DESCRIPTION |
614 | |
615 | C<Net::Cmd> is a collection of methods that can be inherited by a sub class |
616 | of C<IO::Handle>. These methods implement the functionality required for a |
617 | command based protocol, for example FTP and SMTP. |
618 | |
619 | =head1 USER METHODS |
620 | |
621 | These methods provide a user interface to the C<Net::Cmd> object. |
622 | |
623 | =over 4 |
624 | |
625 | =item debug ( VALUE ) |
626 | |
627 | Set the level of debug information for this object. If C<VALUE> is not given |
628 | then the current state is returned. Otherwise the state is changed to |
629 | C<VALUE> and the previous state returned. |
630 | |
510179aa |
631 | Different packages |
632 | may implement different levels of debug but a non-zero value results in |
406c51ee |
633 | copies of all commands and responses also being sent to STDERR. |
634 | |
635 | If C<VALUE> is C<undef> then the debug level will be set to the default |
636 | debug level for the class. |
637 | |
638 | This method can also be called as a I<static> method to set/get the default |
639 | debug level for a given class. |
640 | |
641 | =item message () |
642 | |
643 | Returns the text message returned from the last command |
644 | |
645 | =item code () |
646 | |
647 | Returns the 3-digit code from the last command. If a command is pending |
648 | then the value 0 is returned |
649 | |
650 | =item ok () |
651 | |
652 | Returns non-zero if the last code value was greater than zero and |
653 | less than 400. This holds true for most command servers. Servers |
654 | where this does not hold may override this method. |
655 | |
656 | =item status () |
657 | |
658 | Returns the most significant digit of the current status code. If a command |
659 | is pending then C<CMD_PENDING> is returned. |
660 | |
661 | =item datasend ( DATA ) |
662 | |
663 | Send data to the remote server, converting LF to CRLF. Any line starting |
664 | with a '.' will be prefixed with another '.'. |
665 | C<DATA> may be an array or a reference to an array. |
666 | |
667 | =item dataend () |
668 | |
669 | End the sending of data to the remote server. This is done by ensuring that |
670 | the data already sent ends with CRLF then sending '.CRLF' to end the |
671 | transmission. Once this data has been sent C<dataend> calls C<response> and |
672 | returns true if C<response> returns CMD_OK. |
673 | |
674 | =back |
675 | |
676 | =head1 CLASS METHODS |
677 | |
678 | These methods are not intended to be called by the user, but used or |
679 | over-ridden by a sub-class of C<Net::Cmd> |
680 | |
681 | =over 4 |
682 | |
683 | =item debug_print ( DIR, TEXT ) |
684 | |
685 | Print debugging information. C<DIR> denotes the direction I<true> being |
686 | data being sent to the server. Calls C<debug_text> before printing to |
687 | STDERR. |
688 | |
689 | =item debug_text ( TEXT ) |
690 | |
691 | This method is called to print debugging information. TEXT is |
692 | the text being sent. The method should return the text to be printed |
693 | |
694 | This is primarily meant for the use of modules such as FTP where passwords |
695 | are sent, but we do not want to display them in the debugging information. |
696 | |
697 | =item command ( CMD [, ARGS, ... ]) |
698 | |
699 | Send a command to the command server. All arguments a first joined with |
700 | a space character and CRLF is appended, this string is then sent to the |
701 | command server. |
702 | |
703 | Returns undef upon failure |
704 | |
705 | =item unsupported () |
706 | |
707 | Sets the status code to 580 and the response text to 'Unsupported command'. |
708 | Returns zero. |
709 | |
710 | =item response () |
711 | |
712 | Obtain a response from the server. Upon success the most significant digit |
713 | of the status code is returned. Upon failure, timeout etc., I<undef> is |
714 | returned. |
715 | |
716 | =item parse_response ( TEXT ) |
717 | |
718 | This method is called by C<response> as a method with one argument. It should |
719 | return an array of 2 values, the 3-digit status code and a flag which is true |
720 | when this is part of a multi-line response and this line is not the list. |
721 | |
722 | =item getline () |
723 | |
724 | Retrieve one line, delimited by CRLF, from the remote server. Returns I<undef> |
725 | upon failure. |
726 | |
727 | B<NOTE>: If you do use this method for any reason, please remember to add |
728 | some C<debug_print> calls into your method. |
729 | |
730 | =item ungetline ( TEXT ) |
731 | |
732 | Unget a line of text from the server. |
733 | |
dea4d7df |
734 | =item rawdatasend ( DATA ) |
735 | |
736 | Send data to the remote server without performing any conversions. C<DATA> |
737 | is a scalar. |
738 | |
406c51ee |
739 | =item read_until_dot () |
740 | |
741 | Read data from the remote server until a line consisting of a single '.'. |
742 | Any lines starting with '..' will have one of the '.'s removed. |
743 | |
744 | Returns a reference to a list containing the lines, or I<undef> upon failure. |
745 | |
12df23ee |
746 | =item tied_fh () |
747 | |
748 | Returns a filehandle tied to the Net::Cmd object. After issuing a |
749 | command, you may read from this filehandle using read() or <>. The |
750 | filehandle will return EOF when the final dot is encountered. |
751 | Similarly, you may write to the filehandle in order to send data to |
3c4b39be |
752 | the server after issuing a command that expects data to be written. |
12df23ee |
753 | |
754 | See the Net::POP3 and Net::SMTP modules for examples of this. |
755 | |
406c51ee |
756 | =back |
757 | |
758 | =head1 EXPORTS |
759 | |
760 | C<Net::Cmd> exports six subroutines, five of these, C<CMD_INFO>, C<CMD_OK>, |
510179aa |
761 | C<CMD_MORE>, C<CMD_REJECT> and C<CMD_ERROR>, correspond to possible results |
406c51ee |
762 | of C<response> and C<status>. The sixth is C<CMD_PENDING>. |
763 | |
764 | =head1 AUTHOR |
765 | |
766 | Graham Barr <gbarr@pobox.com> |
767 | |
768 | =head1 COPYRIGHT |
769 | |
770 | Copyright (c) 1995-1997 Graham Barr. All rights reserved. |
771 | This program is free software; you can redistribute it and/or modify |
772 | it under the same terms as Perl itself. |
773 | |
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774 | =for html <hr> |
775 | |
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776 | I<$Id: //depot/libnet/Net/Cmd.pm#34 $> |
686337f3 |
777 | |
406c51ee |
778 | =cut |