1 # Copyright (C) 2015-2019 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
4 # Each instance of this represents a NNTP client socket
5 package PublicInbox::NNTP;
8 use base qw(PublicInbox::DS);
9 use fields qw(nntpd article ng);
10 use PublicInbox::Search;
11 use PublicInbox::Msgmap;
12 use PublicInbox::MID qw(mid_escape);
15 use POSIX qw(strftime);
16 use PublicInbox::DS qw(now);
17 use Digest::SHA qw(sha1_hex);
18 use Time::Local qw(timegm timelocal);
20 LINE_MAX => 512, # RFC 977 section 2.3
21 r501 => '501 command syntax error',
22 r502 => '502 Command unavailable',
23 r221 => '221 Header follows',
24 r224 => '224 Overview information follows (multi-line)',
25 r225 => '225 Headers follow (multi-line)',
26 r430 => '430 No article with that message-id',
28 use PublicInbox::Syscall qw(EPOLLIN EPOLLONESHOT);
31 my @OVERVIEW = qw(Subject From Date Message-ID References);
32 my $OVERVIEW_FMT = join(":\r\n", @OVERVIEW, qw(Bytes Lines), '') .
34 my $LIST_HEADERS = join("\r\n", @OVERVIEW,
35 qw(:bytes :lines Xref To Cc)) . "\r\n";
36 my $CAPABILITIES = <<"";
37 101 Capability list:\r
41 LIST ACTIVE ACTIVE.TIMES NEWSGROUPS OVERVIEW.FMT\r
46 my $EXPMAP; # fd -> [ idle_time, $self ]
48 our $EXPTIME = 180; # 3 minutes
50 sub update_idle_time ($) {
52 my $sock = $self->{sock} or return;
53 $EXPMAP->{fileno($sock)} = [ now(), $self ];
59 my $old = $now - $exp;
61 while (my ($fd, $v) = each %$EXPMAP) {
62 my ($idle_time, $nntp) = @$v;
63 if ($idle_time < $old) {
72 $expt = scalar(keys %new) ? PublicInbox::DS::later(*expire_old)
76 sub greet ($) { $_[0]->write($_[0]->{nntpd}->{greet}) };
79 my ($class, $sock, $nntpd) = @_;
80 my $self = fields::new($class);
83 if (ref($sock) eq 'IO::Socket::SSL' && !$sock->accept_SSL) {
84 return CORE::close($sock) if $! != EAGAIN;
85 $ev = PublicInbox::TLS::epollbit();
86 $wbuf = [ \&PublicInbox::DS::accept_tls_step, \&greet ];
88 $self->SUPER::new($sock, $ev | EPOLLONESHOT);
89 $self->{nntpd} = $nntpd;
91 $self->{wbuf} = $wbuf;
95 update_idle_time($self);
96 $expt ||= PublicInbox::DS::later(*expire_old);
101 my ($cb, $argc) = @_;
102 my $tot = prototype $cb;
103 my ($nreq, undef) = split(';', $tot);
104 $nreq = ($nreq =~ tr/$//) - 1;
105 $tot = ($tot =~ tr/$//) - 1;
106 ($argc <= $tot && $argc >= $nreq);
109 # returns 1 if we can continue, 0 if not due to buffered writes or disconnect
110 sub process_line ($$) {
112 my ($req, @args) = split(/[ \t]/, $l);
113 return 1 unless defined($req); # skip blank line
116 *{'cmd_'.lc($req)}{CODE};
118 return res($self, '500 command not recognized') unless $req;
119 return res($self, r501) unless args_ok($req, scalar @args);
121 my $res = eval { $req->($self, @args) };
123 if ($err && $self->{sock}) {
126 err($self, 'error from: %s (%s)', $l, $err);
127 $res = '503 program fault - command not performed';
129 return 0 unless defined $res;
133 # The keyword argument is not used (rfc3977 5.2.2)
134 sub cmd_capabilities ($;$) {
135 my ($self, undef) = @_;
136 my $res = $CAPABILITIES;
137 if (ref($self->{sock}) ne 'IO::Socket::SSL' &&
138 $self->{nntpd}->{accept_tls}) {
139 $res .= "STARTTLS\r\n";
145 my ($self, $arg) = @_;
147 return r501 unless $arg eq 'READER';
148 '201 Posting prohibited';
151 sub cmd_slave ($) { '202 slave status noted' }
153 sub cmd_xgtitle ($;$) {
154 my ($self, $wildmat) = @_;
155 more($self, '282 list of groups and descriptions follows');
156 list_newsgroups($self, $wildmat);
160 sub list_overview_fmt ($) {
162 $self->msg_more($OVERVIEW_FMT);
165 sub list_headers ($;$) {
167 $self->msg_more($LIST_HEADERS);
170 sub list_active ($;$) {
171 my ($self, $wildmat) = @_;
172 wildmat2re($wildmat);
173 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
174 $ng->{newsgroup} =~ $wildmat or next;
175 group_line($self, $ng);
179 sub list_active_times ($;$) {
180 my ($self, $wildmat) = @_;
181 wildmat2re($wildmat);
182 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
183 $ng->{newsgroup} =~ $wildmat or next;
184 my $c = eval { $ng->mm->created_at } || time;
185 more($self, "$ng->{newsgroup} $c $ng->{-primary_address}");
189 sub list_newsgroups ($;$) {
190 my ($self, $wildmat) = @_;
191 wildmat2re($wildmat);
192 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
193 $ng->{newsgroup} =~ $wildmat or next;
194 my $d = $ng->description;
195 more($self, "$ng->{newsgroup} $d");
199 # LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported
200 sub cmd_list ($;$$) {
201 my ($self, @args) = @_;
203 my $arg = shift @args;
204 $arg =~ tr/A-Z./a-z_/;
211 return r501 unless $arg && args_ok($arg, scalar @args);
212 more($self, '215 information follows');
213 $arg->($self, @args);
215 more($self, '215 list of newsgroups follows');
216 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
217 group_line($self, $ng);
223 sub cmd_listgroup ($;$$) {
224 my ($self, $group, $range) = @_;
225 if (defined $group) {
226 my $res = cmd_group($self, $group);
227 return $res if ($res !~ /\A211 /);
230 my $ng = $self->{ng} or return '412 no newsgroup selected';
232 if (defined $range) {
233 my $r = get_range($self, $range);
234 return $r unless ref $r;
235 my ($beg, $end) = @$r;
236 long_response($self, sub {
237 $r = $mm->msg_range(\$beg, $end, 'num');
238 scalar(@$r) or return;
239 more($self, join("\r\n", map { $_->[0] } @$r));
242 } else { # grab every article number
244 long_response($self, sub {
245 my $ary = $mm->ids_after(\$n);
246 scalar(@$ary) or return;
247 more($self, join("\r\n", @$ary));
253 sub parse_time ($$;$) {
254 my ($date, $time, $gmt) = @_;
255 my ($hh, $mm, $ss) = unpack('A2A2A2', $time);
257 $gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt";
260 my @now = $gmt ? gmtime : localtime;
261 my ($YYYY, $MM, $DD);
262 if (bytes::length($date) == 8) { # RFC 3977 allows YYYYMMDD
263 ($YYYY, $MM, $DD) = unpack('A4A2A2', $date);
264 } else { # legacy clients send YYMMDD
265 ($YYYY, $MM, $DD) = unpack('A2A2A2', $date);
266 my $cur_year = $now[5] + 1900;
267 if ($YYYY > $cur_year) {
268 $YYYY += int($cur_year / 1000) * 1000 - 100;
272 timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
274 timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
278 sub group_line ($$) {
279 my ($self, $ng) = @_;
280 my ($min, $max) = $ng->mm->minmax;
281 more($self, "$ng->{newsgroup} $max $min n") if defined $min && defined $max;
284 sub cmd_newgroups ($$$;$$) {
285 my ($self, $date, $time, $gmt, $dists) = @_;
286 my $ts = eval { parse_time($date, $time, $gmt) };
290 more($self, '231 list of new newsgroups follows');
291 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
292 my $c = eval { $ng->mm->created_at } || 0;
293 next unless $c > $ts;
294 group_line($self, $ng);
299 sub wildmat2re (;$) {
300 return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*');
305 $tmp =~ s#(?<!\\)\[(.+)(?<!\\)\]#
307 my $key = sha1_hex($orig . $salt);
308 $orig =~ s/([^\w\-])+/\Q$1/g;
312 my %map = ('*' => '.*', '?' => '.' );
313 $tmp =~ s#(?<!\\)([^\w\\])#$map{$1} || "\Q$1"#ge;
315 $tmp =~ s#([a-f0-9]{40})#
316 my $orig = $keep{$1};
317 defined $orig ? $orig : $1;
320 $_[0] = qr/\A$tmp\z/;
324 return $_[0] = qr/\A\z/ unless defined $_[0];
325 my %map = ('*' => '.*', ',' => '|');
326 $_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge;
327 $_[0] = qr/\A(?:$_[0])\z/;
330 sub cmd_newnews ($$$$;$$) {
331 my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_;
332 my $ts = eval { parse_time($date, $time, $gmt) };
334 more($self, '230 list of new articles by message-id follows');
335 my ($keep, $skip) = split('!', $newsgroups, 2);
339 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
340 $ng->{newsgroup} =~ $keep or next;
341 $ng->{newsgroup} =~ $skip and next;
342 my $over = $ng->over or next;
345 return '.' unless @over;
348 long_response($self, sub {
350 my $msgs = $over->query_ts($ts, $prev);
353 join(">\r\n<", map { $_->mid } @$msgs ).
355 $prev = $msgs->[-1]->{num};
358 if (@over) { # continue onto next newsgroup
361 } else { # break out of the long response.
369 my ($self, $group) = @_;
370 my $no_such = '411 no such news group';
371 my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such;
374 my ($min, $max) = $ng->mm->minmax;
377 $self->{article} = $min;
378 my $est_size = $max - $min;
379 "211 $est_size $min $max $group";
382 sub article_adj ($$) {
383 my ($self, $off) = @_;
384 my $ng = $self->{ng} or return '412 no newsgroup selected';
386 my $n = $self->{article};
387 defined $n or return '420 no current article has been selected';
390 my $mid = $ng->mm->mid_for($n);
392 $n = $off > 0 ? 'next' : 'previous';
393 return "421 no $n article in this group";
395 $self->{article} = $n;
396 "223 $n <$mid> article retrieved - request text separately";
399 sub cmd_next ($) { article_adj($_[0], 1) }
400 sub cmd_last ($) { article_adj($_[0], -1) }
402 # We want to encourage using email and CC-ing everybody involved to avoid
403 # the single-point-of-failure a single server provides.
406 my $ng = $self->{ng};
407 $ng ? "440 mailto:$ng->{-primary_address} to post"
408 : '440 posting not allowed'
413 res($self, '205 closing connection - goodbye!');
418 sub header_append ($$$) {
419 my ($hdr, $k, $v) = @_;
420 my @v = $hdr->header($k);
424 $hdr->header_set($k, @v, $v);
428 my ($self, $ng, $n, $mid) = @_;
429 my $ret = $self->{nntpd}->{servername} . " $ng->{newsgroup}:$n";
431 # num_for is pretty cheap and sometimes we'll lookup the existence
432 # of an article without getting even the OVER info. In other words,
433 # I'm not sure if its worth optimizing by scanning To:/Cc: and
434 # PublicInbox::ExtMsg on the PSGI end is just as expensive
435 foreach my $other (@{$self->{nntpd}->{grouplist}}) {
436 next if $ng eq $other;
437 my $num = eval { $other->mm->num_for($mid) } or next;
438 $ret .= " $other->{newsgroup}:$num";
443 sub set_nntp_headers ($$$$$) {
444 my ($self, $hdr, $ng, $n, $mid) = @_;
446 # why? leafnode requires a Path: header for some inexplicable
447 # reason. We'll fake the shortest one possible.
448 $hdr->header_set('Path', 'y');
450 # leafnode (and maybe other NNTP clients) have trouble dealing
451 # with v2 messages which have multiple Message-IDs (either due
452 # to our own content-based dedupe or buggy git-send-email versions).
453 my @mids = $hdr->header('Message-ID');
454 if (scalar(@mids) > 1) {
456 $hdr->header_set('Message-ID', $mid0);
457 my @alt = $hdr->header('X-Alt-Message-ID');
458 my %seen = map { $_ => 1 } (@alt, $mid0);
459 foreach my $m (@mids) {
463 $hdr->header_set('X-Alt-Message-ID', @alt);
467 my $xref = xref($self, $ng, $n, $mid);
468 $hdr->header_set('Xref', $xref);
469 $xref =~ s/:[0-9]+//g;
470 $hdr->header_set('Newsgroups', (split(/ /, $xref, 2))[1]);
471 header_append($hdr, 'List-Post', "<mailto:$ng->{-primary_address}>");
472 if (my $url = $ng->base_url) {
473 $mid = mid_escape($mid);
474 header_append($hdr, 'Archived-At', "<$url$mid/>");
475 header_append($hdr, 'List-Archive', "<$url>");
479 sub art_lookup ($$$) {
480 my ($self, $art, $set_headers) = @_;
481 my $ng = $self->{ng};
485 if ($art =~ /\A[0-9]+\z/) {
486 $err = '423 no such article number in this group';
489 } elsif ($art =~ /\A<([^>]+)>\z/) {
492 $n = $ng->mm->num_for($mid) if $ng;
493 goto found if defined $n;
494 foreach my $g (values %{$self->{nntpd}->{groups}}) {
495 $n = $g->mm->num_for($mid);
506 $err = '420 no current article has been selected';
507 $n = $self->{article};
508 defined $n or return $err;
510 $ng or return '412 no newsgroup has been selected';
511 $mid = $ng->mm->mid_for($n);
512 defined $mid or return $err;
515 my $smsg = $ng->over->get_art($n) or return $err;
516 my $msg = $ng->msg_by_smsg($smsg) or return $err;
518 # Email::Simple->new will modify $msg in-place as documented
519 # in its manpage, so what's left is the body and we won't need
520 # to call Email::Simple::body(), later
521 my $hdr = Email::Simple->new($msg)->header_obj;
522 set_nntp_headers($self, $hdr, $ng, $n, $mid) if $set_headers;
523 [ $n, $mid, $msg, $hdr ];
526 sub msg_body_write ($$) {
527 my ($self, $msg) = @_;
529 # these can momentarily double the memory consumption :<
530 $$msg =~ s/^\./../smg;
531 $$msg =~ s/(?<!\r)\n/\r\n/sg; # Alpine barfs without this
532 $$msg .= "\r\n" unless $$msg =~ /\r\n\z/s;
533 $self->msg_more($$msg);
538 my ($self, $art) = @_;
539 $self->{article} = $art if defined $art && $art =~ /\A[0-9]+\z/;
542 sub msg_hdr_write ($$$) {
543 my ($self, $hdr, $body_follows) = @_;
544 $hdr = $hdr->as_string;
546 $hdr =~ s/(?<!\r)\n/\r\n/sg; # Alpine barfs without this
548 # for leafnode compatibility, we need to ensure Message-ID headers
549 # are only a single line. We can't subclass Email::Simple::Header
550 # and override _default_fold_at in here, either; since that won't
551 # affect messages already in the archive.
552 $hdr =~ s/^(Message-ID:)[ \t]*\r\n[ \t]+([^\r]+)\r\n/$1 $2\r\n/igsm;
553 $hdr .= "\r\n" if $body_follows;
554 $self->msg_more($hdr);
557 sub cmd_article ($;$) {
558 my ($self, $art) = @_;
559 my $r = art_lookup($self, $art, 1);
560 return $r unless ref $r;
561 my ($n, $mid, $msg, $hdr) = @$r;
562 set_art($self, $art);
563 more($self, "220 $n <$mid> article retrieved - head and body follow");
564 msg_hdr_write($self, $hdr, 1);
565 msg_body_write($self, $msg);
569 my ($self, $art) = @_;
570 my $r = art_lookup($self, $art, 2);
571 return $r unless ref $r;
572 my ($n, $mid, undef, $hdr) = @$r;
573 set_art($self, $art);
574 more($self, "221 $n <$mid> article retrieved - head follows");
575 msg_hdr_write($self, $hdr, 0);
580 my ($self, $art) = @_;
581 my $r = art_lookup($self, $art, 0);
582 return $r unless ref $r;
583 my ($n, $mid, $msg) = @$r;
584 set_art($self, $art);
585 more($self, "222 $n <$mid> article retrieved - body follows");
586 msg_body_write($self, $msg);
590 my ($self, $art) = @_;
591 my $r = art_lookup($self, $art, 0);
592 return $r unless ref $r;
594 set_art($self, $art);
595 "223 $n <$mid> article retrieved - request text separately";
598 sub cmd_ihave ($) { '435 article not wanted - do not send it' }
600 sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) }
604 more($self, '100 help text follows');
609 my ($self, $range) = @_;
610 my $ng = $self->{ng} or return '412 no news group has been selected';
611 defined $range or return '420 No article(s) selected';
613 my ($min, $max) = $ng->mm->minmax;
614 if ($range =~ /\A([0-9]+)\z/) {
616 } elsif ($range =~ /\A([0-9]+)-\z/) {
617 ($beg, $end) = ($1, $max);
618 } elsif ($range =~ /\A([0-9]+)-([0-9]+)\z/) {
619 ($beg, $end) = ($1, $2);
623 $beg = $min if ($beg < $min);
624 $end = $max if ($end > $max);
625 return '420 No article(s) selected' if ($beg > $end);
629 sub long_response ($$) {
630 my ($self, $cb) = @_; # cb returns true if more, false if done
632 my $fd = fileno($self->{sock});
633 defined $fd or return;
634 # make sure we disable reading during a long response,
635 # clients should not be sending us stuff and making us do more
636 # work while we are stream a response to them
638 my $long_cb; # DANGER: self-referential
640 # wbuf is unset or empty, here; $cb may add to it
641 my $more = eval { $cb->() };
642 if ($@ || !$self->{sock}) { # something bad happened...
644 my $diff = now() - $t0;
647 "%s during long response[$fd] - %0.6f",
650 out($self, " deferred[$fd] aborted - %0.6f", $diff);
652 } elsif ($more) { # $self->{wbuf}:
653 update_idle_time($self);
655 # COMPRESS users all share the same DEFLATE context.
656 # Flush it here to ensure clients don't see
660 # no recursion, schedule another call ASAP
661 # but only after all pending writes are done
662 my $wbuf = $self->{wbuf} ||= [];
663 push @$wbuf, $long_cb;
665 # wbuf may be populated by $cb, no need to rearm if so:
666 $self->requeue if scalar(@$wbuf) == 1;
670 out($self, " deferred[$fd] done - %0.6f", now() - $t0);
671 my $wbuf = $self->{wbuf};
672 $self->requeue unless $wbuf && @$wbuf;
675 $self->write($long_cb); # kick off!
679 sub hdr_message_id ($$$) { # optimize XHDR Message-ID [range] for slrnpull.
680 my ($self, $xhdr, $range) = @_;
682 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
683 my ($ng, $n) = mid_lookup($self, $1);
684 return r430 unless $n;
685 hdr_mid_response($self, $xhdr, $ng, $n, $range, $range);
686 } else { # numeric range
687 $range = $self->{article} unless defined $range;
688 my $r = get_range($self, $range);
689 return $r unless ref $r;
690 my $mm = $self->{ng}->mm;
691 my ($beg, $end) = @$r;
692 more($self, $xhdr ? r221 : r225);
693 long_response($self, sub {
694 my $r = $mm->msg_range(\$beg, $end);
696 more($self, join("\r\n", map {
704 sub mid_lookup ($$) {
705 my ($self, $mid) = @_;
706 my $self_ng = $self->{ng};
708 my $n = $self_ng->mm->num_for($mid);
709 return ($self_ng, $n) if defined $n;
711 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
712 next if defined $self_ng && $ng eq $self_ng;
713 my $n = $ng->mm->num_for($mid);
714 return ($ng, $n) if defined $n;
719 sub hdr_xref ($$$) { # optimize XHDR Xref [range] for rtin
720 my ($self, $xhdr, $range) = @_;
722 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
724 my ($ng, $n) = mid_lookup($self, $mid);
725 return r430 unless $n;
726 hdr_mid_response($self, $xhdr, $ng, $n, $range,
727 xref($self, $ng, $n, $mid));
728 } else { # numeric range
729 $range = $self->{article} unless defined $range;
730 my $r = get_range($self, $range);
731 return $r unless ref $r;
732 my $ng = $self->{ng};
734 my ($beg, $end) = @$r;
735 more($self, $xhdr ? r221 : r225);
736 long_response($self, sub {
737 my $r = $mm->msg_range(\$beg, $end);
739 more($self, join("\r\n", map {
741 "$num ".xref($self, $ng, $num, $_->[1]);
748 sub over_header_for {
749 my ($over, $num, $field) = @_;
750 my $smsg = $over->get_art($num) or return;
751 return PublicInbox::SearchMsg::date($smsg) if $field eq 'date';
755 sub hdr_searchmsg ($$$$) {
756 my ($self, $xhdr, $field, $range) = @_;
757 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
758 my ($ng, $n) = mid_lookup($self, $1);
759 return r430 unless defined $n;
760 my $v = over_header_for($ng->over, $n, $field);
761 hdr_mid_response($self, $xhdr, $ng, $n, $range, $v);
762 } else { # numeric range
763 $range = $self->{article} unless defined $range;
764 my $over = $self->{ng}->over;
765 my $mm = $self->{ng}->mm;
766 my $r = get_range($self, $range);
767 return $r unless ref $r;
768 my ($beg, $end) = @$r;
769 more($self, $xhdr ? r221 : r225);
771 long_response($self, sub {
772 my $msgs = $over->query_xover($cur, $end);
773 my $nr = scalar @$msgs or return;
775 foreach my $s (@$msgs) {
776 $tmp .= $s->{num} . ' ' . $s->$field . "\r\n";
779 $self->msg_more($tmp);
780 $cur = $msgs->[-1]->{num} + 1;
786 my ($self, $xhdr, $header, $range) = @_;
787 my $sub = lc $header;
788 if ($sub eq 'message-id') {
789 hdr_message_id($self, $xhdr, $range);
790 } elsif ($sub eq 'xref') {
791 hdr_xref($self, $xhdr, $range);
792 } elsif ($sub =~ /\A(?:subject|references|date|from|to|cc|
794 hdr_searchmsg($self, $xhdr, $sub, $range);
795 } elsif ($sub =~ /\A:(bytes|lines)\z/) {
796 hdr_searchmsg($self, $xhdr, $1, $range);
798 $xhdr ? (r221 . "\r\n.") : "503 HDR not permitted on $header";
804 my ($self, $header, $range) = @_;
805 do_hdr($self, 0, $header, $range);
809 sub cmd_xhdr ($$;$) {
810 my ($self, $header, $range) = @_;
811 do_hdr($self, 1, $header, $range);
814 sub hdr_mid_prefix ($$$$$) {
815 my ($self, $xhdr, $ng, $n, $mid) = @_;
816 return $mid if $xhdr;
818 # HDR for RFC 3977 users
819 if (my $self_ng = $self->{ng}) {
820 ($self_ng eq $ng) ? $n : '0';
826 sub hdr_mid_response ($$$$$$) {
827 my ($self, $xhdr, $ng, $n, $mid, $v) = @_;
830 $res .= r221 . "\r\n";
831 $res .= "$mid $v\r\n";
833 $res .= r225 . "\r\n";
834 my $pfx = hdr_mid_prefix($self, $xhdr, $ng, $n, $mid);
835 $res .= "$pfx $v\r\n";
837 res($self, $res .= '.');
841 sub cmd_xrover ($;$) {
842 my ($self, $range) = @_;
843 my $ng = $self->{ng} or return '412 no newsgroup selected';
844 (defined $range && $range =~ /[<>]/) and
845 return '420 No article(s) selected'; # no message IDs
847 $range = $self->{article} unless defined $range;
848 my $r = get_range($self, $range);
849 return $r unless ref $r;
850 my ($beg, $end) = @$r;
852 my $over = $ng->over;
853 more($self, '224 Overview information follows');
855 long_response($self, sub {
856 my $h = over_header_for($over, $beg, 'references');
857 more($self, "$beg $h") if defined($h);
862 sub over_line ($$$$) {
863 my ($self, $ng, $num, $smsg) = @_;
864 # n.b. field access and procedural calls can be
865 # 10%-15% faster than OO method calls:
866 my $s = join("\t", $num,
869 PublicInbox::SearchMsg::date($smsg),
874 "Xref: " . xref($self, $ng, $num, $smsg->{mid}));
880 my ($self, $range) = @_;
881 if ($range && $range =~ /\A<(.+)>\z/) {
882 my ($ng, $n) = mid_lookup($self, $1);
883 defined $n or return r430;
884 my $smsg = $ng->over->get_art($n) or return r430;
885 more($self, '224 Overview information follows (multi-line)');
887 # Only set article number column if it's the current group
888 my $self_ng = $self->{ng};
889 $n = 0 if (!$self_ng || $self_ng ne $ng);
890 more($self, over_line($self, $ng, $n, $smsg));
893 cmd_xover($self, $range);
897 sub cmd_xover ($;$) {
898 my ($self, $range) = @_;
899 $range = $self->{article} unless defined $range;
900 my $r = get_range($self, $range);
901 return $r unless ref $r;
902 my ($beg, $end) = @$r;
903 more($self, "224 Overview information follows for $beg to $end");
904 my $over = $self->{ng}->over;
906 long_response($self, sub {
907 my $msgs = $over->query_xover($cur, $end);
908 my $nr = scalar @$msgs or return;
911 more($self, join("\r\n", map {
912 over_line($self, $self->{ng}, $_->{num}, $_);
914 $cur = $msgs->[-1]->{num} + 1;
918 sub compressed { undef }
920 sub cmd_starttls ($) {
922 my $sock = $self->{sock} or return;
924 return r502 if (ref($sock) eq 'IO::Socket::SSL' || $self->compressed);
925 my $opt = $self->{nntpd}->{accept_tls} or
926 return '580 can not initiate TLS negotiation';
927 res($self, '382 Continue with TLS negotiation');
928 $self->{sock} = IO::Socket::SSL->start_SSL($sock, %$opt);
929 $self->requeue if PublicInbox::DS::accept_tls_step($self);
934 sub cmd_compress ($$) {
935 my ($self, $alg) = @_;
936 return '503 Only DEFLATE is supported' if uc($alg) ne 'DEFLATE';
937 return r502 if $self->compressed || !$have_deflate;
938 PublicInbox::NNTPdeflate->enable($self);
943 sub zflush {} # overridden by NNTPdeflate
946 my ($self, $mid) = @_;
947 return r501 unless $mid =~ /\A<(.+)>\z/;
950 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
951 my $n = $ng->mm->num_for($mid);
952 push @paths, "$ng->{newsgroup}/$n" if defined $n;
954 return '430 no such article on server' unless @paths;
955 '223 '.join(' ', @paths);
958 sub res ($$) { do_write($_[0], $_[1] . "\r\n") }
960 sub more ($$) { $_[0]->msg_more($_[1] . "\r\n") }
964 my $done = $self->write(\($_[1]));
965 return 0 unless $self->{sock};
971 my ($self, $fmt, @args) = @_;
972 printf { $self->{nntpd}->{err} } $fmt."\n", @args;
976 my ($self, $fmt, @args) = @_;
977 printf { $self->{nntpd}->{out} } $fmt."\n", @args;
980 # callback used by PublicInbox::DS for any (e)poll (in/out/hup/err)
984 return unless $self->flush_write && $self->{sock};
986 update_idle_time($self);
987 # only read more requests if we've drained the write buffer,
988 # otherwise we can be buffering infinitely w/o backpressure
990 my $rbuf = $self->{rbuf} // (\(my $x = ''));
993 if (index($$rbuf, "\n") < 0) {
994 my $off = bytes::length($$rbuf);
995 $r = $self->do_read($rbuf, LINE_MAX, $off) or return;
997 while ($r > 0 && $$rbuf =~ s/\A[ \t]*([^\n]*?)\r?\n//) {
999 return $self->close if $line =~ /[[:cntrl:]]/s;
1001 my $fd = fileno($self->{sock});
1002 $r = eval { process_line($self, $line) };
1003 my $pending = $self->{wbuf} ? ' pending' : '';
1004 out($self, "[$fd] %s - %0.6f$pending", $line, now() - $t0);
1007 return $self->close if $r < 0;
1008 my $len = bytes::length($$rbuf);
1009 return $self->close if ($len >= LINE_MAX);
1010 $self->rbuf_idle($rbuf);
1011 update_idle_time($self);
1013 # maybe there's more pipelined data, or we'll have
1014 # to register it for socket-readiness notifications
1015 $self->requeue unless $self->{wbuf};
1018 sub not_idle_long ($$) {
1019 my ($self, $now) = @_;
1020 my $sock = $self->{sock} or return;
1021 my $ary = $EXPMAP->{fileno($sock)} or return;
1022 my $exp_at = $ary->[0] + $EXPTIME;
1026 # for graceful shutdown in PublicInbox::Daemon:
1028 my ($self, $now) = @_;
1029 ($self->{rbuf} || $self->{wbuf} || not_idle_long($self, $now));
1032 # this is an import to prevent "perl -c" from complaining about fields
1034 $have_deflate = eval { require PublicInbox::NNTPdeflate } and
1035 $CAPABILITIES .= "COMPRESS DEFLATE\r\n";