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);
14 require PublicInbox::EvCleanup;
16 use POSIX qw(strftime);
17 PublicInbox::DS->import(qw(now msg_more));
18 use Digest::SHA qw(sha1_hex);
19 use Time::Local qw(timegm timelocal);
21 r501 => '501 command syntax error',
22 r221 => '221 Header follows',
23 r224 => '224 Overview information follows (multi-line)',
24 r225 => '225 Headers follow (multi-line)',
25 r430 => '430 No article with that message-id',
27 use PublicInbox::Syscall qw(EPOLLIN EPOLLONESHOT);
30 my @OVERVIEW = qw(Subject From Date Message-ID References Xref);
31 my $OVERVIEW_FMT = join(":\r\n", @OVERVIEW, qw(Bytes Lines)) . ":\r\n";
32 my $LIST_HEADERS = join("\r\n", @OVERVIEW,
33 qw(:bytes :lines Xref To Cc)) . "\r\n";
35 # disable commands with easy DoS potential:
36 my %DISABLED; # = map { $_ => 1 } qw(xover list_overview_fmt newnews xhdr);
38 my $EXPMAP; # fd -> [ idle_time, $self ]
40 our $EXPTIME = 180; # 3 minutes
42 sub update_idle_time ($) {
44 my $sock = $self->{sock} or return;
45 $EXPMAP->{fileno($sock)} = [ now(), $self ];
51 my $old = $now - $exp;
54 while (my ($fd, $v) = each %$EXPMAP) {
55 my ($idle_time, $nntp) = @$v;
56 if ($idle_time < $old) {
67 $expt = PublicInbox::EvCleanup::later(*expire_old) if $nr;
70 sub greet ($) { $_[0]->write($_[0]->{nntpd}->{greet}) };
73 my ($class, $sock, $nntpd) = @_;
74 my $self = fields::new($class);
77 if (ref($sock) eq 'IO::Socket::SSL' && !$sock->accept_SSL) {
78 $ev = PublicInbox::TLS::epollbit() or return CORE::close($sock);
79 $wbuf = [ \&PublicInbox::DS::accept_tls_step, \&greet ];
81 $self->SUPER::new($sock, $ev | EPOLLONESHOT);
82 $self->{nntpd} = $nntpd;
84 $self->{wbuf} = $wbuf;
88 update_idle_time($self);
89 $expt ||= PublicInbox::EvCleanup::later(*expire_old);
95 my $tot = prototype $cb;
96 my ($nreq, undef) = split(';', $tot);
97 $nreq = ($nreq =~ tr/$//) - 1;
98 $tot = ($tot =~ tr/$//) - 1;
99 ($argc <= $tot && $argc >= $nreq);
102 # returns 1 if we can continue, 0 if not due to buffered writes or disconnect
103 sub process_line ($$) {
105 my ($req, @args) = split(/[ \t]/, $l);
106 return 1 unless defined($req); # skip blank line
110 $req = $DISABLED{$req} ? undef : *{'cmd_'.$req}{CODE};
112 return res($self, '500 command not recognized') unless $req;
113 return res($self, r501) unless args_ok($req, scalar @args);
115 my $res = eval { $req->($self, @args) };
117 if ($err && $self->{sock}) {
120 err($self, 'error from: %s (%s)', $l, $err);
121 $res = '503 program fault - command not performed';
123 return 0 unless defined $res;
128 my ($self, $arg) = @_;
130 return r501 unless $arg eq 'READER';
131 '201 Posting prohibited';
134 sub cmd_slave ($) { '202 slave status noted' }
136 sub cmd_xgtitle ($;$) {
137 my ($self, $wildmat) = @_;
138 more($self, '282 list of groups and descriptions follows');
139 list_newsgroups($self, $wildmat);
143 sub list_overview_fmt ($) {
145 msg_more($self, $OVERVIEW_FMT);
148 sub list_headers ($;$) {
150 msg_more($self, $LIST_HEADERS);
153 sub list_active ($;$) {
154 my ($self, $wildmat) = @_;
155 wildmat2re($wildmat);
156 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
157 $ng->{newsgroup} =~ $wildmat or next;
158 group_line($self, $ng);
162 sub list_active_times ($;$) {
163 my ($self, $wildmat) = @_;
164 wildmat2re($wildmat);
165 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
166 $ng->{newsgroup} =~ $wildmat or next;
167 my $c = eval { $ng->mm->created_at } || time;
168 more($self, "$ng->{newsgroup} $c $ng->{-primary_address}");
172 sub list_newsgroups ($;$) {
173 my ($self, $wildmat) = @_;
174 wildmat2re($wildmat);
175 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
176 $ng->{newsgroup} =~ $wildmat or next;
177 my $d = $ng->description;
178 more($self, "$ng->{newsgroup} $d");
182 # LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported
183 sub cmd_list ($;$$) {
184 my ($self, @args) = @_;
186 my $arg = shift @args;
187 $arg =~ tr/A-Z./a-z_/;
189 return r501 if $DISABLED{$arg};
195 return r501 unless $arg && args_ok($arg, scalar @args);
196 more($self, '215 information follows');
197 $arg->($self, @args);
199 more($self, '215 list of newsgroups follows');
200 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
201 group_line($self, $ng);
207 sub cmd_listgroup ($;$) {
208 my ($self, $group) = @_;
209 if (defined $group) {
210 my $res = cmd_group($self, $group);
211 return $res if ($res !~ /\A211 /);
215 $self->{ng} or return '412 no newsgroup selected';
217 long_response($self, sub {
218 my $ary = $self->{ng}->mm->ids_after(\$n);
219 scalar @$ary or return;
220 more($self, join("\r\n", @$ary));
225 sub parse_time ($$;$) {
226 my ($date, $time, $gmt) = @_;
227 my ($hh, $mm, $ss) = unpack('A2A2A2', $time);
229 $gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt";
232 my @now = $gmt ? gmtime : localtime;
233 my ($YYYY, $MM, $DD);
234 if (bytes::length($date) == 8) { # RFC 3977 allows YYYYMMDD
235 ($YYYY, $MM, $DD) = unpack('A4A2A2', $date);
236 } else { # legacy clients send YYMMDD
237 ($YYYY, $MM, $DD) = unpack('A2A2A2', $date);
238 my $cur_year = $now[5] + 1900;
239 if ($YYYY > $cur_year) {
240 $YYYY += int($cur_year / 1000) * 1000 - 100;
244 timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
246 timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
250 sub group_line ($$) {
251 my ($self, $ng) = @_;
252 my ($min, $max) = $ng->mm->minmax;
253 more($self, "$ng->{newsgroup} $max $min n") if defined $min && defined $max;
256 sub cmd_newgroups ($$$;$$) {
257 my ($self, $date, $time, $gmt, $dists) = @_;
258 my $ts = eval { parse_time($date, $time, $gmt) };
262 more($self, '231 list of new newsgroups follows');
263 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
264 my $c = eval { $ng->mm->created_at } || 0;
265 next unless $c > $ts;
266 group_line($self, $ng);
271 sub wildmat2re (;$) {
272 return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*');
277 $tmp =~ s#(?<!\\)\[(.+)(?<!\\)\]#
279 my $key = sha1_hex($orig . $salt);
280 $orig =~ s/([^\w\-])+/\Q$1/g;
284 my %map = ('*' => '.*', '?' => '.' );
285 $tmp =~ s#(?<!\\)([^\w\\])#$map{$1} || "\Q$1"#ge;
287 $tmp =~ s#([a-f0-9]{40})#
288 my $orig = $keep{$1};
289 defined $orig ? $orig : $1;
292 $_[0] = qr/\A$tmp\z/;
296 return $_[0] = qr/\A\z/ unless defined $_[0];
297 my %map = ('*' => '.*', ',' => '|');
298 $_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge;
299 $_[0] = qr/\A(?:$_[0])\z/;
302 sub cmd_newnews ($$$$;$$) {
303 my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_;
304 my $ts = eval { parse_time($date, $time, $gmt) };
306 more($self, '230 list of new articles by message-id follows');
307 my ($keep, $skip) = split('!', $newsgroups, 2);
311 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
312 $ng->{newsgroup} =~ $keep or next;
313 $ng->{newsgroup} =~ $skip and next;
314 my $over = $ng->over or next;
317 return '.' unless @over;
320 long_response($self, sub {
322 my $msgs = $over->query_ts($ts, $prev);
325 join(">\r\n<", map { $_->mid } @$msgs ).
327 $prev = $msgs->[-1]->{num};
330 if (@over) { # continue onto next newsgroup
333 } else { # break out of the long response.
341 my ($self, $group) = @_;
342 my $no_such = '411 no such news group';
343 my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such;
346 my ($min, $max) = $ng->mm->minmax;
349 $self->{article} = $min;
350 my $est_size = $max - $min;
351 "211 $est_size $min $max $group";
354 sub article_adj ($$) {
355 my ($self, $off) = @_;
356 my $ng = $self->{ng} or return '412 no newsgroup selected';
358 my $n = $self->{article};
359 defined $n or return '420 no current article has been selected';
362 my $mid = $ng->mm->mid_for($n);
364 $n = $off > 0 ? 'next' : 'previous';
365 return "421 no $n article in this group";
367 $self->{article} = $n;
368 "223 $n <$mid> article retrieved - request text separately";
371 sub cmd_next ($) { article_adj($_[0], 1) }
372 sub cmd_last ($) { article_adj($_[0], -1) }
374 # We want to encourage using email and CC-ing everybody involved to avoid
375 # the single-point-of-failure a single server provides.
378 my $ng = $self->{ng};
379 $ng ? "440 mailto:$ng->{-primary_address} to post"
380 : '440 posting not allowed'
385 res($self, '205 closing connection - goodbye!');
390 sub header_append ($$$) {
391 my ($hdr, $k, $v) = @_;
392 my @v = $hdr->header($k);
396 $hdr->header_set($k, @v, $v);
400 my ($self, $ng, $n, $mid) = @_;
401 my $ret = $self->{nntpd}->{servername} . " $ng->{newsgroup}:$n";
403 # num_for is pretty cheap and sometimes we'll lookup the existence
404 # of an article without getting even the OVER info. In other words,
405 # I'm not sure if its worth optimizing by scanning To:/Cc: and
406 # PublicInbox::ExtMsg on the PSGI end is just as expensive
407 foreach my $other (@{$self->{nntpd}->{grouplist}}) {
408 next if $ng eq $other;
409 my $num = eval { $other->mm->num_for($mid) } or next;
410 $ret .= " $other->{newsgroup}:$num";
415 sub set_nntp_headers ($$$$$) {
416 my ($self, $hdr, $ng, $n, $mid) = @_;
418 # why? leafnode requires a Path: header for some inexplicable
419 # reason. We'll fake the shortest one possible.
420 $hdr->header_set('Path', 'y');
422 # leafnode (and maybe other NNTP clients) have trouble dealing
423 # with v2 messages which have multiple Message-IDs (either due
424 # to our own content-based dedupe or buggy git-send-email versions).
425 my @mids = $hdr->header('Message-ID');
426 if (scalar(@mids) > 1) {
428 $hdr->header_set('Message-ID', $mid0);
429 my @alt = $hdr->header('X-Alt-Message-ID');
430 my %seen = map { $_ => 1 } (@alt, $mid0);
431 foreach my $m (@mids) {
435 $hdr->header_set('X-Alt-Message-ID', @alt);
439 my $xref = xref($self, $ng, $n, $mid);
440 $hdr->header_set('Xref', $xref);
441 $xref =~ s/:[0-9]+//g;
442 $hdr->header_set('Newsgroups', (split(/ /, $xref, 2))[1]);
443 header_append($hdr, 'List-Post', "<mailto:$ng->{-primary_address}>");
444 if (my $url = $ng->base_url) {
445 $mid = mid_escape($mid);
446 header_append($hdr, 'Archived-At', "<$url$mid/>");
447 header_append($hdr, 'List-Archive', "<$url>");
451 sub art_lookup ($$$) {
452 my ($self, $art, $set_headers) = @_;
453 my $ng = $self->{ng};
457 if ($art =~ /\A[0-9]+\z/) {
458 $err = '423 no such article number in this group';
461 } elsif ($art =~ /\A<([^>]+)>\z/) {
464 $n = $ng->mm->num_for($mid) if $ng;
465 goto found if defined $n;
466 foreach my $g (values %{$self->{nntpd}->{groups}}) {
467 $n = $g->mm->num_for($mid);
478 $err = '420 no current article has been selected';
479 $n = $self->{article};
480 defined $n or return $err;
482 $ng or return '412 no newsgroup has been selected';
483 $mid = $ng->mm->mid_for($n);
484 defined $mid or return $err;
487 my $smsg = $ng->over->get_art($n) or return $err;
488 my $msg = $ng->msg_by_smsg($smsg) or return $err;
489 my $s = Email::Simple->new($msg);
491 set_nntp_headers($self, $s->header_obj, $ng, $n, $mid);
494 $s->body_set('') if ($set_headers == 2);
496 [ $n, $mid, $s, $smsg->bytes, $smsg->lines, $ng ];
499 sub simple_body_write ($$) {
503 $body =~ s/^\./../smg;
504 $body =~ s/(?<!\r)\n/\r\n/sg;
505 msg_more($self, $body);
506 msg_more($self, "\r\n") unless $body =~ /\r\n\z/s;
511 my ($self, $art) = @_;
512 $self->{article} = $art if defined $art && $art =~ /\A[0-9]+\z/;
516 my $hdr = $_[0]->header_obj->as_string;
518 $hdr =~ s/(?<!\r)\n/\r\n/sg;
520 # for leafnode compatibility, we need to ensure Message-ID headers
521 # are only a single line. We can't subclass Email::Simple::Header
522 # and override _default_fold_at in here, either; since that won't
523 # affect messages already in the archive.
524 $hdr =~ s/^(Message-ID:)[ \t]*\r\n[ \t]+([^\r]+)\r\n/$1 $2\r\n/igsm;
529 sub cmd_article ($;$) {
530 my ($self, $art) = @_;
531 my $r = art_lookup($self, $art, 1);
532 return $r unless ref $r;
533 my ($n, $mid, $s) = @$r;
534 set_art($self, $art);
535 more($self, "220 $n <$mid> article retrieved - head and body follow");
536 msg_more($self, _header($s));
537 msg_more($self, "\r\n");
538 simple_body_write($self, $s);
542 my ($self, $art) = @_;
543 my $r = art_lookup($self, $art, 2);
544 return $r unless ref $r;
545 my ($n, $mid, $s) = @$r;
546 set_art($self, $art);
547 more($self, "221 $n <$mid> article retrieved - head follows");
548 msg_more($self, _header($s));
553 my ($self, $art) = @_;
554 my $r = art_lookup($self, $art, 0);
555 return $r unless ref $r;
556 my ($n, $mid, $s) = @$r;
557 set_art($self, $art);
558 more($self, "222 $n <$mid> article retrieved - body follows");
559 simple_body_write($self, $s);
563 my ($self, $art) = @_;
564 my $r = art_lookup($self, $art, 0);
565 return $r unless ref $r;
566 my ($n, $mid, undef) = @$r;
567 set_art($self, $art);
568 "223 $n <$mid> article retrieved - request text separately";
571 sub cmd_ihave ($) { '435 article not wanted - do not send it' }
573 sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) }
577 more($self, '100 help text follows');
582 my ($self, $range) = @_;
583 my $ng = $self->{ng} or return '412 no news group has been selected';
584 defined $range or return '420 No article(s) selected';
586 my ($min, $max) = $ng->mm->minmax;
587 if ($range =~ /\A([0-9]+)\z/) {
589 } elsif ($range =~ /\A([0-9]+)-\z/) {
590 ($beg, $end) = ($1, $max);
591 } elsif ($range =~ /\A([0-9]+)-([0-9]+)\z/) {
592 ($beg, $end) = ($1, $2);
596 $beg = $min if ($beg < $min);
597 $end = $max if ($end > $max);
598 return '420 No article(s) selected' if ($beg > $end);
602 sub long_response ($$) {
603 my ($self, $cb) = @_; # cb returns true if more, false if done
605 my $fd = fileno($self->{sock});
606 defined $fd or return;
607 # make sure we disable reading during a long response,
608 # clients should not be sending us stuff and making us do more
609 # work while we are stream a response to them
611 my $long_cb; # DANGER: self-referential
613 # wbuf is unset or empty, here; $cb may add to it
614 my $more = eval { $cb->() };
615 if ($@ || !$self->{sock}) { # something bad happened...
617 my $diff = now() - $t0;
620 "%s during long response[$fd] - %0.6f",
623 out($self, " deferred[$fd] aborted - %0.6f", $diff);
625 } elsif ($more) { # $self->{wbuf}:
626 update_idle_time($self);
628 # no recursion, schedule another call ASAP
629 # but only after all pending writes are done
630 my $wbuf = $self->{wbuf} ||= [];
631 push @$wbuf, $long_cb;
633 # wbuf may be populated by $cb, no need to rearm if so:
634 $self->requeue if scalar(@$wbuf) == 1;
638 out($self, " deferred[$fd] done - %0.6f", now() - $t0);
639 $self->requeue unless $self->{wbuf};
642 $self->write($long_cb); # kick off!
646 sub hdr_message_id ($$$) { # optimize XHDR Message-ID [range] for slrnpull.
647 my ($self, $xhdr, $range) = @_;
649 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
650 my ($ng, $n) = mid_lookup($self, $1);
651 return r430 unless $n;
652 hdr_mid_response($self, $xhdr, $ng, $n, $range, $range);
653 } else { # numeric range
654 $range = $self->{article} unless defined $range;
655 my $r = get_range($self, $range);
656 return $r unless ref $r;
657 my $mm = $self->{ng}->mm;
658 my ($beg, $end) = @$r;
659 more($self, $xhdr ? r221 : r225);
660 long_response($self, sub {
661 my $r = $mm->msg_range(\$beg, $end);
663 more($self, join("\r\n", map {
671 sub mid_lookup ($$) {
672 my ($self, $mid) = @_;
673 my $self_ng = $self->{ng};
675 my $n = $self_ng->mm->num_for($mid);
676 return ($self_ng, $n) if defined $n;
678 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
679 next if defined $self_ng && $ng eq $self_ng;
680 my $n = $ng->mm->num_for($mid);
681 return ($ng, $n) if defined $n;
686 sub hdr_xref ($$$) { # optimize XHDR Xref [range] for rtin
687 my ($self, $xhdr, $range) = @_;
689 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
691 my ($ng, $n) = mid_lookup($self, $mid);
692 return r430 unless $n;
693 hdr_mid_response($self, $xhdr, $ng, $n, $range,
694 xref($self, $ng, $n, $mid));
695 } else { # numeric range
696 $range = $self->{article} unless defined $range;
697 my $r = get_range($self, $range);
698 return $r unless ref $r;
699 my $ng = $self->{ng};
701 my ($beg, $end) = @$r;
702 more($self, $xhdr ? r221 : r225);
703 long_response($self, sub {
704 my $r = $mm->msg_range(\$beg, $end);
706 more($self, join("\r\n", map {
708 "$num ".xref($self, $ng, $num, $_->[1]);
715 sub over_header_for {
716 my ($over, $num, $field) = @_;
717 my $smsg = $over->get_art($num) or return;
718 return PublicInbox::SearchMsg::date($smsg) if $field eq 'date';
722 sub hdr_searchmsg ($$$$) {
723 my ($self, $xhdr, $field, $range) = @_;
724 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
725 my ($ng, $n) = mid_lookup($self, $1);
726 return r430 unless defined $n;
727 my $v = over_header_for($ng->over, $n, $field);
728 hdr_mid_response($self, $xhdr, $ng, $n, $range, $v);
729 } else { # numeric range
730 $range = $self->{article} unless defined $range;
731 my $over = $self->{ng}->over;
732 my $mm = $self->{ng}->mm;
733 my $r = get_range($self, $range);
734 return $r unless ref $r;
735 my ($beg, $end) = @$r;
736 more($self, $xhdr ? r221 : r225);
738 long_response($self, sub {
739 my $msgs = $over->query_xover($cur, $end);
740 my $nr = scalar @$msgs or return;
742 foreach my $s (@$msgs) {
743 $tmp .= $s->{num} . ' ' . $s->$field . "\r\n";
746 msg_more($self, $tmp);
747 $cur = $msgs->[-1]->{num} + 1;
753 my ($self, $xhdr, $header, $range) = @_;
754 my $sub = lc $header;
755 if ($sub eq 'message-id') {
756 hdr_message_id($self, $xhdr, $range);
757 } elsif ($sub eq 'xref') {
758 hdr_xref($self, $xhdr, $range);
759 } elsif ($sub =~ /\A(?:subject|references|date|from|to|cc|
761 hdr_searchmsg($self, $xhdr, $sub, $range);
762 } elsif ($sub =~ /\A:(bytes|lines)\z/) {
763 hdr_searchmsg($self, $xhdr, $1, $range);
765 $xhdr ? (r221 . "\r\n.") : "503 HDR not permitted on $header";
771 my ($self, $header, $range) = @_;
772 do_hdr($self, 0, $header, $range);
776 sub cmd_xhdr ($$;$) {
777 my ($self, $header, $range) = @_;
778 do_hdr($self, 1, $header, $range);
781 sub hdr_mid_prefix ($$$$$) {
782 my ($self, $xhdr, $ng, $n, $mid) = @_;
783 return $mid if $xhdr;
785 # HDR for RFC 3977 users
786 if (my $self_ng = $self->{ng}) {
787 ($self_ng eq $ng) ? $n : '0';
793 sub hdr_mid_response ($$$$$$) {
794 my ($self, $xhdr, $ng, $n, $mid, $v) = @_; # r: art_lookup result
797 $res .= r221 . "\r\n";
798 $res .= "$mid $v\r\n";
800 $res .= r225 . "\r\n";
801 my $pfx = hdr_mid_prefix($self, $xhdr, $ng, $n, $mid);
802 $res .= "$pfx $v\r\n";
804 res($self, $res .= '.');
808 sub cmd_xrover ($;$) {
809 my ($self, $range) = @_;
810 my $ng = $self->{ng} or return '412 no newsgroup selected';
811 (defined $range && $range =~ /[<>]/) and
812 return '420 No article(s) selected'; # no message IDs
814 $range = $self->{article} unless defined $range;
815 my $r = get_range($self, $range);
816 return $r unless ref $r;
817 my ($beg, $end) = @$r;
819 my $over = $ng->over;
820 more($self, '224 Overview information follows');
822 long_response($self, sub {
823 my $h = over_header_for($over, $beg, 'references');
824 more($self, "$beg $h") if defined($h);
829 sub over_line ($$$$) {
830 my ($self, $ng, $num, $smsg) = @_;
831 # n.b. field access and procedural calls can be
832 # 10%-15% faster than OO method calls:
833 my $s = join("\t", $num,
836 PublicInbox::SearchMsg::date($smsg),
841 "Xref: " . xref($self, $ng, $num, $smsg->{mid}));
847 my ($self, $range) = @_;
848 if ($range && $range =~ /\A<(.+)>\z/) {
849 my ($ng, $n) = mid_lookup($self, $1);
850 defined $n or return r430;
851 my $smsg = $ng->over->get_art($n) or return r430;
852 more($self, '224 Overview information follows (multi-line)');
854 # Only set article number column if it's the current group
855 my $self_ng = $self->{ng};
856 $n = 0 if (!$self_ng || $self_ng ne $ng);
857 more($self, over_line($self, $ng, $n, $smsg));
860 cmd_xover($self, $range);
864 sub cmd_xover ($;$) {
865 my ($self, $range) = @_;
866 $range = $self->{article} unless defined $range;
867 my $r = get_range($self, $range);
868 return $r unless ref $r;
869 my ($beg, $end) = @$r;
870 more($self, "224 Overview information follows for $beg to $end");
871 my $over = $self->{ng}->over;
873 long_response($self, sub {
874 my $msgs = $over->query_xover($cur, $end);
875 my $nr = scalar @$msgs or return;
878 more($self, join("\r\n", map {
879 over_line($self, $self->{ng}, $_->{num}, $_);
881 $cur = $msgs->[-1]->{num} + 1;
885 sub cmd_starttls ($) {
887 my $sock = $self->{sock} or return;
889 (ref($sock) eq 'IO::Socket::SSL') and return '502 Command unavailable';
890 my $opt = $self->{nntpd}->{accept_tls} or
891 return '580 can not initiate TLS negotiation';
892 res($self, '382 Continue with TLS negotiation');
893 $self->{sock} = IO::Socket::SSL->start_SSL($sock, %$opt);
894 $self->requeue if PublicInbox::DS::accept_tls_step($self);
899 my ($self, $mid) = @_;
900 return r501 unless $mid =~ /\A<(.+)>\z/;
903 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
904 my $n = $ng->mm->num_for($mid);
905 push @paths, "$ng->{newsgroup}/$n" if defined $n;
907 return '430 no such article on server' unless @paths;
908 '223 '.join(' ', @paths);
911 sub res ($$) { do_write($_[0], $_[1] . "\r\n") }
913 sub more ($$) { msg_more($_[0], $_[1] . "\r\n") }
917 my $done = $self->write(\($_[1]));
918 return 0 unless $self->{sock};
924 my ($self, $fmt, @args) = @_;
925 printf { $self->{nntpd}->{err} } $fmt."\n", @args;
929 my ($self, $fmt, @args) = @_;
930 printf { $self->{nntpd}->{out} } $fmt."\n", @args;
933 # callback used by PublicInbox::DS for any (e)poll (in/out/hup/err)
937 return unless $self->flush_write && $self->{sock};
939 update_idle_time($self);
940 # only read more requests if we've drained the write buffer,
941 # otherwise we can be buffering infinitely w/o backpressure
943 use constant LINE_MAX => 512; # RFC 977 section 2.3
944 my $rbuf = $self->{rbuf} // (\(my $x = ''));
947 if (index($$rbuf, "\n") < 0) {
948 my $off = bytes::length($$rbuf);
949 $r = $self->do_read($rbuf, LINE_MAX, $off) or return;
951 while ($r > 0 && $$rbuf =~ s/\A[ \t\r\n]*([^\r\n]*)\r?\n//) {
953 return $self->close if $line =~ /[[:cntrl:]]/s;
955 my $fd = fileno($self->{sock});
956 $r = eval { process_line($self, $line) };
957 my $pending = $self->{wbuf} ? ' pending' : '';
958 out($self, "[$fd] %s - %0.6f$pending", $line, now() - $t0);
961 return $self->close if $r < 0;
962 my $len = bytes::length($$rbuf);
963 return $self->close if ($len >= LINE_MAX);
964 $self->rbuf_idle($rbuf);
965 update_idle_time($self);
967 # maybe there's more pipelined data, or we'll have
968 # to register it for socket-readiness notifications
969 $self->requeue unless $self->{wbuf};
972 sub not_idle_long ($$) {
973 my ($self, $now) = @_;
974 my $sock = $self->{sock} or return;
975 my $ary = $EXPMAP->{fileno($sock)} or return;
976 my $exp_at = $ary->[0] + $EXPTIME;
980 # for graceful shutdown in PublicInbox::Daemon:
982 my ($self, $now) = @_;
983 ($self->{rbuf} || $self->{wbuf} || not_idle_long($self, $now));