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 my $EXPMAP; # fd -> [ idle_time, $self ]
37 our $EXPTIME = 180; # 3 minutes
39 sub update_idle_time ($) {
41 my $sock = $self->{sock} or return;
42 $EXPMAP->{fileno($sock)} = [ now(), $self ];
48 my $old = $now - $exp;
51 while (my ($fd, $v) = each %$EXPMAP) {
52 my ($idle_time, $nntp) = @$v;
53 if ($idle_time < $old) {
64 $expt = PublicInbox::EvCleanup::later(*expire_old) if $nr;
67 sub greet ($) { $_[0]->write($_[0]->{nntpd}->{greet}) };
70 my ($class, $sock, $nntpd) = @_;
71 my $self = fields::new($class);
74 if (ref($sock) eq 'IO::Socket::SSL' && !$sock->accept_SSL) {
75 return CORE::close($sock) if $! != EAGAIN;
76 $ev = PublicInbox::TLS::epollbit();
77 $wbuf = [ \&PublicInbox::DS::accept_tls_step, \&greet ];
79 $self->SUPER::new($sock, $ev | EPOLLONESHOT);
80 $self->{nntpd} = $nntpd;
82 $self->{wbuf} = $wbuf;
86 update_idle_time($self);
87 $expt ||= PublicInbox::EvCleanup::later(*expire_old);
93 my $tot = prototype $cb;
94 my ($nreq, undef) = split(';', $tot);
95 $nreq = ($nreq =~ tr/$//) - 1;
96 $tot = ($tot =~ tr/$//) - 1;
97 ($argc <= $tot && $argc >= $nreq);
100 # returns 1 if we can continue, 0 if not due to buffered writes or disconnect
101 sub process_line ($$) {
103 my ($req, @args) = split(/[ \t]/, $l);
104 return 1 unless defined($req); # skip blank line
107 *{'cmd_'.lc($req)}{CODE};
109 return res($self, '500 command not recognized') unless $req;
110 return res($self, r501) unless args_ok($req, scalar @args);
112 my $res = eval { $req->($self, @args) };
114 if ($err && $self->{sock}) {
117 err($self, 'error from: %s (%s)', $l, $err);
118 $res = '503 program fault - command not performed';
120 return 0 unless defined $res;
125 my ($self, $arg) = @_;
127 return r501 unless $arg eq 'READER';
128 '201 Posting prohibited';
131 sub cmd_slave ($) { '202 slave status noted' }
133 sub cmd_xgtitle ($;$) {
134 my ($self, $wildmat) = @_;
135 more($self, '282 list of groups and descriptions follows');
136 list_newsgroups($self, $wildmat);
140 sub list_overview_fmt ($) {
142 msg_more($self, $OVERVIEW_FMT);
145 sub list_headers ($;$) {
147 msg_more($self, $LIST_HEADERS);
150 sub list_active ($;$) {
151 my ($self, $wildmat) = @_;
152 wildmat2re($wildmat);
153 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
154 $ng->{newsgroup} =~ $wildmat or next;
155 group_line($self, $ng);
159 sub list_active_times ($;$) {
160 my ($self, $wildmat) = @_;
161 wildmat2re($wildmat);
162 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
163 $ng->{newsgroup} =~ $wildmat or next;
164 my $c = eval { $ng->mm->created_at } || time;
165 more($self, "$ng->{newsgroup} $c $ng->{-primary_address}");
169 sub list_newsgroups ($;$) {
170 my ($self, $wildmat) = @_;
171 wildmat2re($wildmat);
172 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
173 $ng->{newsgroup} =~ $wildmat or next;
174 my $d = $ng->description;
175 more($self, "$ng->{newsgroup} $d");
179 # LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported
180 sub cmd_list ($;$$) {
181 my ($self, @args) = @_;
183 my $arg = shift @args;
184 $arg =~ tr/A-Z./a-z_/;
191 return r501 unless $arg && args_ok($arg, scalar @args);
192 more($self, '215 information follows');
193 $arg->($self, @args);
195 more($self, '215 list of newsgroups follows');
196 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
197 group_line($self, $ng);
203 sub cmd_listgroup ($;$) {
204 my ($self, $group) = @_;
205 if (defined $group) {
206 my $res = cmd_group($self, $group);
207 return $res if ($res !~ /\A211 /);
211 $self->{ng} or return '412 no newsgroup selected';
213 long_response($self, sub {
214 my $ary = $self->{ng}->mm->ids_after(\$n);
215 scalar @$ary or return;
216 more($self, join("\r\n", @$ary));
221 sub parse_time ($$;$) {
222 my ($date, $time, $gmt) = @_;
223 my ($hh, $mm, $ss) = unpack('A2A2A2', $time);
225 $gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt";
228 my @now = $gmt ? gmtime : localtime;
229 my ($YYYY, $MM, $DD);
230 if (bytes::length($date) == 8) { # RFC 3977 allows YYYYMMDD
231 ($YYYY, $MM, $DD) = unpack('A4A2A2', $date);
232 } else { # legacy clients send YYMMDD
233 ($YYYY, $MM, $DD) = unpack('A2A2A2', $date);
234 my $cur_year = $now[5] + 1900;
235 if ($YYYY > $cur_year) {
236 $YYYY += int($cur_year / 1000) * 1000 - 100;
240 timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
242 timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
246 sub group_line ($$) {
247 my ($self, $ng) = @_;
248 my ($min, $max) = $ng->mm->minmax;
249 more($self, "$ng->{newsgroup} $max $min n") if defined $min && defined $max;
252 sub cmd_newgroups ($$$;$$) {
253 my ($self, $date, $time, $gmt, $dists) = @_;
254 my $ts = eval { parse_time($date, $time, $gmt) };
258 more($self, '231 list of new newsgroups follows');
259 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
260 my $c = eval { $ng->mm->created_at } || 0;
261 next unless $c > $ts;
262 group_line($self, $ng);
267 sub wildmat2re (;$) {
268 return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*');
273 $tmp =~ s#(?<!\\)\[(.+)(?<!\\)\]#
275 my $key = sha1_hex($orig . $salt);
276 $orig =~ s/([^\w\-])+/\Q$1/g;
280 my %map = ('*' => '.*', '?' => '.' );
281 $tmp =~ s#(?<!\\)([^\w\\])#$map{$1} || "\Q$1"#ge;
283 $tmp =~ s#([a-f0-9]{40})#
284 my $orig = $keep{$1};
285 defined $orig ? $orig : $1;
288 $_[0] = qr/\A$tmp\z/;
292 return $_[0] = qr/\A\z/ unless defined $_[0];
293 my %map = ('*' => '.*', ',' => '|');
294 $_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge;
295 $_[0] = qr/\A(?:$_[0])\z/;
298 sub cmd_newnews ($$$$;$$) {
299 my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_;
300 my $ts = eval { parse_time($date, $time, $gmt) };
302 more($self, '230 list of new articles by message-id follows');
303 my ($keep, $skip) = split('!', $newsgroups, 2);
307 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
308 $ng->{newsgroup} =~ $keep or next;
309 $ng->{newsgroup} =~ $skip and next;
310 my $over = $ng->over or next;
313 return '.' unless @over;
316 long_response($self, sub {
318 my $msgs = $over->query_ts($ts, $prev);
321 join(">\r\n<", map { $_->mid } @$msgs ).
323 $prev = $msgs->[-1]->{num};
326 if (@over) { # continue onto next newsgroup
329 } else { # break out of the long response.
337 my ($self, $group) = @_;
338 my $no_such = '411 no such news group';
339 my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such;
342 my ($min, $max) = $ng->mm->minmax;
345 $self->{article} = $min;
346 my $est_size = $max - $min;
347 "211 $est_size $min $max $group";
350 sub article_adj ($$) {
351 my ($self, $off) = @_;
352 my $ng = $self->{ng} or return '412 no newsgroup selected';
354 my $n = $self->{article};
355 defined $n or return '420 no current article has been selected';
358 my $mid = $ng->mm->mid_for($n);
360 $n = $off > 0 ? 'next' : 'previous';
361 return "421 no $n article in this group";
363 $self->{article} = $n;
364 "223 $n <$mid> article retrieved - request text separately";
367 sub cmd_next ($) { article_adj($_[0], 1) }
368 sub cmd_last ($) { article_adj($_[0], -1) }
370 # We want to encourage using email and CC-ing everybody involved to avoid
371 # the single-point-of-failure a single server provides.
374 my $ng = $self->{ng};
375 $ng ? "440 mailto:$ng->{-primary_address} to post"
376 : '440 posting not allowed'
381 res($self, '205 closing connection - goodbye!');
386 sub header_append ($$$) {
387 my ($hdr, $k, $v) = @_;
388 my @v = $hdr->header($k);
392 $hdr->header_set($k, @v, $v);
396 my ($self, $ng, $n, $mid) = @_;
397 my $ret = $self->{nntpd}->{servername} . " $ng->{newsgroup}:$n";
399 # num_for is pretty cheap and sometimes we'll lookup the existence
400 # of an article without getting even the OVER info. In other words,
401 # I'm not sure if its worth optimizing by scanning To:/Cc: and
402 # PublicInbox::ExtMsg on the PSGI end is just as expensive
403 foreach my $other (@{$self->{nntpd}->{grouplist}}) {
404 next if $ng eq $other;
405 my $num = eval { $other->mm->num_for($mid) } or next;
406 $ret .= " $other->{newsgroup}:$num";
411 sub set_nntp_headers ($$$$$) {
412 my ($self, $hdr, $ng, $n, $mid) = @_;
414 # why? leafnode requires a Path: header for some inexplicable
415 # reason. We'll fake the shortest one possible.
416 $hdr->header_set('Path', 'y');
418 # leafnode (and maybe other NNTP clients) have trouble dealing
419 # with v2 messages which have multiple Message-IDs (either due
420 # to our own content-based dedupe or buggy git-send-email versions).
421 my @mids = $hdr->header('Message-ID');
422 if (scalar(@mids) > 1) {
424 $hdr->header_set('Message-ID', $mid0);
425 my @alt = $hdr->header('X-Alt-Message-ID');
426 my %seen = map { $_ => 1 } (@alt, $mid0);
427 foreach my $m (@mids) {
431 $hdr->header_set('X-Alt-Message-ID', @alt);
435 my $xref = xref($self, $ng, $n, $mid);
436 $hdr->header_set('Xref', $xref);
437 $xref =~ s/:[0-9]+//g;
438 $hdr->header_set('Newsgroups', (split(/ /, $xref, 2))[1]);
439 header_append($hdr, 'List-Post', "<mailto:$ng->{-primary_address}>");
440 if (my $url = $ng->base_url) {
441 $mid = mid_escape($mid);
442 header_append($hdr, 'Archived-At', "<$url$mid/>");
443 header_append($hdr, 'List-Archive', "<$url>");
447 sub art_lookup ($$$) {
448 my ($self, $art, $set_headers) = @_;
449 my $ng = $self->{ng};
453 if ($art =~ /\A[0-9]+\z/) {
454 $err = '423 no such article number in this group';
457 } elsif ($art =~ /\A<([^>]+)>\z/) {
460 $n = $ng->mm->num_for($mid) if $ng;
461 goto found if defined $n;
462 foreach my $g (values %{$self->{nntpd}->{groups}}) {
463 $n = $g->mm->num_for($mid);
474 $err = '420 no current article has been selected';
475 $n = $self->{article};
476 defined $n or return $err;
478 $ng or return '412 no newsgroup has been selected';
479 $mid = $ng->mm->mid_for($n);
480 defined $mid or return $err;
483 my $smsg = $ng->over->get_art($n) or return $err;
484 my $msg = $ng->msg_by_smsg($smsg) or return $err;
486 # Email::Simple->new will modify $msg in-place as documented
487 # in its manpage, so what's left is the body and we won't need
488 # to call Email::Simple::body(), later
489 my $hdr = Email::Simple->new($msg)->header_obj;
490 set_nntp_headers($self, $hdr, $ng, $n, $mid) if $set_headers;
491 [ $n, $mid, $msg, $hdr ];
494 sub msg_body_write ($$) {
495 my ($self, $msg) = @_;
497 # these can momentarily double the memory consumption :<
498 $$msg =~ s/^\./../smg;
499 $$msg =~ s/(?<!\r)\n/\r\n/sg; # Alpine barfs without this
500 $$msg .= "\r\n" unless $$msg =~ /\r\n\z/s;
501 msg_more($self, $$msg);
506 my ($self, $art) = @_;
507 $self->{article} = $art if defined $art && $art =~ /\A[0-9]+\z/;
510 sub msg_hdr_write ($$$) {
511 my ($self, $hdr, $body_follows) = @_;
512 $hdr = $hdr->as_string;
514 $hdr =~ s/(?<!\r)\n/\r\n/sg; # Alpine barfs without this
516 # for leafnode compatibility, we need to ensure Message-ID headers
517 # are only a single line. We can't subclass Email::Simple::Header
518 # and override _default_fold_at in here, either; since that won't
519 # affect messages already in the archive.
520 $hdr =~ s/^(Message-ID:)[ \t]*\r\n[ \t]+([^\r]+)\r\n/$1 $2\r\n/igsm;
521 $hdr .= "\r\n" if $body_follows;
522 msg_more($self, $hdr);
525 sub cmd_article ($;$) {
526 my ($self, $art) = @_;
527 my $r = art_lookup($self, $art, 1);
528 return $r unless ref $r;
529 my ($n, $mid, $msg, $hdr) = @$r;
530 set_art($self, $art);
531 more($self, "220 $n <$mid> article retrieved - head and body follow");
532 msg_hdr_write($self, $hdr, 1);
533 msg_body_write($self, $msg);
537 my ($self, $art) = @_;
538 my $r = art_lookup($self, $art, 2);
539 return $r unless ref $r;
540 my ($n, $mid, undef, $hdr) = @$r;
541 set_art($self, $art);
542 more($self, "221 $n <$mid> article retrieved - head follows");
543 msg_hdr_write($self, $hdr, 0);
548 my ($self, $art) = @_;
549 my $r = art_lookup($self, $art, 0);
550 return $r unless ref $r;
551 my ($n, $mid, $msg) = @$r;
552 set_art($self, $art);
553 more($self, "222 $n <$mid> article retrieved - body follows");
554 msg_body_write($self, $msg);
558 my ($self, $art) = @_;
559 my $r = art_lookup($self, $art, 0);
560 return $r unless ref $r;
562 set_art($self, $art);
563 "223 $n <$mid> article retrieved - request text separately";
566 sub cmd_ihave ($) { '435 article not wanted - do not send it' }
568 sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) }
572 more($self, '100 help text follows');
577 my ($self, $range) = @_;
578 my $ng = $self->{ng} or return '412 no news group has been selected';
579 defined $range or return '420 No article(s) selected';
581 my ($min, $max) = $ng->mm->minmax;
582 if ($range =~ /\A([0-9]+)\z/) {
584 } elsif ($range =~ /\A([0-9]+)-\z/) {
585 ($beg, $end) = ($1, $max);
586 } elsif ($range =~ /\A([0-9]+)-([0-9]+)\z/) {
587 ($beg, $end) = ($1, $2);
591 $beg = $min if ($beg < $min);
592 $end = $max if ($end > $max);
593 return '420 No article(s) selected' if ($beg > $end);
597 sub long_response ($$) {
598 my ($self, $cb) = @_; # cb returns true if more, false if done
600 my $fd = fileno($self->{sock});
601 defined $fd or return;
602 # make sure we disable reading during a long response,
603 # clients should not be sending us stuff and making us do more
604 # work while we are stream a response to them
606 my $long_cb; # DANGER: self-referential
608 # wbuf is unset or empty, here; $cb may add to it
609 my $more = eval { $cb->() };
610 if ($@ || !$self->{sock}) { # something bad happened...
612 my $diff = now() - $t0;
615 "%s during long response[$fd] - %0.6f",
618 out($self, " deferred[$fd] aborted - %0.6f", $diff);
620 } elsif ($more) { # $self->{wbuf}:
621 update_idle_time($self);
623 # no recursion, schedule another call ASAP
624 # but only after all pending writes are done
625 my $wbuf = $self->{wbuf} ||= [];
626 push @$wbuf, $long_cb;
628 # wbuf may be populated by $cb, no need to rearm if so:
629 $self->requeue if scalar(@$wbuf) == 1;
633 out($self, " deferred[$fd] done - %0.6f", now() - $t0);
634 $self->requeue unless $self->{wbuf};
637 $self->write($long_cb); # kick off!
641 sub hdr_message_id ($$$) { # optimize XHDR Message-ID [range] for slrnpull.
642 my ($self, $xhdr, $range) = @_;
644 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
645 my ($ng, $n) = mid_lookup($self, $1);
646 return r430 unless $n;
647 hdr_mid_response($self, $xhdr, $ng, $n, $range, $range);
648 } else { # numeric range
649 $range = $self->{article} unless defined $range;
650 my $r = get_range($self, $range);
651 return $r unless ref $r;
652 my $mm = $self->{ng}->mm;
653 my ($beg, $end) = @$r;
654 more($self, $xhdr ? r221 : r225);
655 long_response($self, sub {
656 my $r = $mm->msg_range(\$beg, $end);
658 more($self, join("\r\n", map {
666 sub mid_lookup ($$) {
667 my ($self, $mid) = @_;
668 my $self_ng = $self->{ng};
670 my $n = $self_ng->mm->num_for($mid);
671 return ($self_ng, $n) if defined $n;
673 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
674 next if defined $self_ng && $ng eq $self_ng;
675 my $n = $ng->mm->num_for($mid);
676 return ($ng, $n) if defined $n;
681 sub hdr_xref ($$$) { # optimize XHDR Xref [range] for rtin
682 my ($self, $xhdr, $range) = @_;
684 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
686 my ($ng, $n) = mid_lookup($self, $mid);
687 return r430 unless $n;
688 hdr_mid_response($self, $xhdr, $ng, $n, $range,
689 xref($self, $ng, $n, $mid));
690 } else { # numeric range
691 $range = $self->{article} unless defined $range;
692 my $r = get_range($self, $range);
693 return $r unless ref $r;
694 my $ng = $self->{ng};
696 my ($beg, $end) = @$r;
697 more($self, $xhdr ? r221 : r225);
698 long_response($self, sub {
699 my $r = $mm->msg_range(\$beg, $end);
701 more($self, join("\r\n", map {
703 "$num ".xref($self, $ng, $num, $_->[1]);
710 sub over_header_for {
711 my ($over, $num, $field) = @_;
712 my $smsg = $over->get_art($num) or return;
713 return PublicInbox::SearchMsg::date($smsg) if $field eq 'date';
717 sub hdr_searchmsg ($$$$) {
718 my ($self, $xhdr, $field, $range) = @_;
719 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
720 my ($ng, $n) = mid_lookup($self, $1);
721 return r430 unless defined $n;
722 my $v = over_header_for($ng->over, $n, $field);
723 hdr_mid_response($self, $xhdr, $ng, $n, $range, $v);
724 } else { # numeric range
725 $range = $self->{article} unless defined $range;
726 my $over = $self->{ng}->over;
727 my $mm = $self->{ng}->mm;
728 my $r = get_range($self, $range);
729 return $r unless ref $r;
730 my ($beg, $end) = @$r;
731 more($self, $xhdr ? r221 : r225);
733 long_response($self, sub {
734 my $msgs = $over->query_xover($cur, $end);
735 my $nr = scalar @$msgs or return;
737 foreach my $s (@$msgs) {
738 $tmp .= $s->{num} . ' ' . $s->$field . "\r\n";
741 msg_more($self, $tmp);
742 $cur = $msgs->[-1]->{num} + 1;
748 my ($self, $xhdr, $header, $range) = @_;
749 my $sub = lc $header;
750 if ($sub eq 'message-id') {
751 hdr_message_id($self, $xhdr, $range);
752 } elsif ($sub eq 'xref') {
753 hdr_xref($self, $xhdr, $range);
754 } elsif ($sub =~ /\A(?:subject|references|date|from|to|cc|
756 hdr_searchmsg($self, $xhdr, $sub, $range);
757 } elsif ($sub =~ /\A:(bytes|lines)\z/) {
758 hdr_searchmsg($self, $xhdr, $1, $range);
760 $xhdr ? (r221 . "\r\n.") : "503 HDR not permitted on $header";
766 my ($self, $header, $range) = @_;
767 do_hdr($self, 0, $header, $range);
771 sub cmd_xhdr ($$;$) {
772 my ($self, $header, $range) = @_;
773 do_hdr($self, 1, $header, $range);
776 sub hdr_mid_prefix ($$$$$) {
777 my ($self, $xhdr, $ng, $n, $mid) = @_;
778 return $mid if $xhdr;
780 # HDR for RFC 3977 users
781 if (my $self_ng = $self->{ng}) {
782 ($self_ng eq $ng) ? $n : '0';
788 sub hdr_mid_response ($$$$$$) {
789 my ($self, $xhdr, $ng, $n, $mid, $v) = @_;
792 $res .= r221 . "\r\n";
793 $res .= "$mid $v\r\n";
795 $res .= r225 . "\r\n";
796 my $pfx = hdr_mid_prefix($self, $xhdr, $ng, $n, $mid);
797 $res .= "$pfx $v\r\n";
799 res($self, $res .= '.');
803 sub cmd_xrover ($;$) {
804 my ($self, $range) = @_;
805 my $ng = $self->{ng} or return '412 no newsgroup selected';
806 (defined $range && $range =~ /[<>]/) and
807 return '420 No article(s) selected'; # no message IDs
809 $range = $self->{article} unless defined $range;
810 my $r = get_range($self, $range);
811 return $r unless ref $r;
812 my ($beg, $end) = @$r;
814 my $over = $ng->over;
815 more($self, '224 Overview information follows');
817 long_response($self, sub {
818 my $h = over_header_for($over, $beg, 'references');
819 more($self, "$beg $h") if defined($h);
824 sub over_line ($$$$) {
825 my ($self, $ng, $num, $smsg) = @_;
826 # n.b. field access and procedural calls can be
827 # 10%-15% faster than OO method calls:
828 my $s = join("\t", $num,
831 PublicInbox::SearchMsg::date($smsg),
836 "Xref: " . xref($self, $ng, $num, $smsg->{mid}));
842 my ($self, $range) = @_;
843 if ($range && $range =~ /\A<(.+)>\z/) {
844 my ($ng, $n) = mid_lookup($self, $1);
845 defined $n or return r430;
846 my $smsg = $ng->over->get_art($n) or return r430;
847 more($self, '224 Overview information follows (multi-line)');
849 # Only set article number column if it's the current group
850 my $self_ng = $self->{ng};
851 $n = 0 if (!$self_ng || $self_ng ne $ng);
852 more($self, over_line($self, $ng, $n, $smsg));
855 cmd_xover($self, $range);
859 sub cmd_xover ($;$) {
860 my ($self, $range) = @_;
861 $range = $self->{article} unless defined $range;
862 my $r = get_range($self, $range);
863 return $r unless ref $r;
864 my ($beg, $end) = @$r;
865 more($self, "224 Overview information follows for $beg to $end");
866 my $over = $self->{ng}->over;
868 long_response($self, sub {
869 my $msgs = $over->query_xover($cur, $end);
870 my $nr = scalar @$msgs or return;
873 more($self, join("\r\n", map {
874 over_line($self, $self->{ng}, $_->{num}, $_);
876 $cur = $msgs->[-1]->{num} + 1;
880 sub cmd_starttls ($) {
882 my $sock = $self->{sock} or return;
884 (ref($sock) eq 'IO::Socket::SSL') and return '502 Command unavailable';
885 my $opt = $self->{nntpd}->{accept_tls} or
886 return '580 can not initiate TLS negotiation';
887 res($self, '382 Continue with TLS negotiation');
888 $self->{sock} = IO::Socket::SSL->start_SSL($sock, %$opt);
889 $self->requeue if PublicInbox::DS::accept_tls_step($self);
894 my ($self, $mid) = @_;
895 return r501 unless $mid =~ /\A<(.+)>\z/;
898 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
899 my $n = $ng->mm->num_for($mid);
900 push @paths, "$ng->{newsgroup}/$n" if defined $n;
902 return '430 no such article on server' unless @paths;
903 '223 '.join(' ', @paths);
906 sub res ($$) { do_write($_[0], $_[1] . "\r\n") }
908 sub more ($$) { msg_more($_[0], $_[1] . "\r\n") }
912 my $done = $self->write(\($_[1]));
913 return 0 unless $self->{sock};
919 my ($self, $fmt, @args) = @_;
920 printf { $self->{nntpd}->{err} } $fmt."\n", @args;
924 my ($self, $fmt, @args) = @_;
925 printf { $self->{nntpd}->{out} } $fmt."\n", @args;
928 # callback used by PublicInbox::DS for any (e)poll (in/out/hup/err)
932 return unless $self->flush_write && $self->{sock};
934 update_idle_time($self);
935 # only read more requests if we've drained the write buffer,
936 # otherwise we can be buffering infinitely w/o backpressure
938 use constant LINE_MAX => 512; # RFC 977 section 2.3
939 my $rbuf = $self->{rbuf} // (\(my $x = ''));
942 if (index($$rbuf, "\n") < 0) {
943 my $off = bytes::length($$rbuf);
944 $r = $self->do_read($rbuf, LINE_MAX, $off) or return;
946 while ($r > 0 && $$rbuf =~ s/\A[ \t\r\n]*([^\r\n]*)\r?\n//) {
948 return $self->close if $line =~ /[[:cntrl:]]/s;
950 my $fd = fileno($self->{sock});
951 $r = eval { process_line($self, $line) };
952 my $pending = $self->{wbuf} ? ' pending' : '';
953 out($self, "[$fd] %s - %0.6f$pending", $line, now() - $t0);
956 return $self->close if $r < 0;
957 my $len = bytes::length($$rbuf);
958 return $self->close if ($len >= LINE_MAX);
959 $self->rbuf_idle($rbuf);
960 update_idle_time($self);
962 # maybe there's more pipelined data, or we'll have
963 # to register it for socket-readiness notifications
964 $self->requeue unless $self->{wbuf};
967 sub not_idle_long ($$) {
968 my ($self, $now) = @_;
969 my $sock = $self->{sock} or return;
970 my $ary = $EXPMAP->{fileno($sock)} or return;
971 my $exp_at = $ary->[0] + $EXPTIME;
975 # for graceful shutdown in PublicInbox::Daemon:
977 my ($self, $now) = @_;
978 ($self->{rbuf} || $self->{wbuf} || not_idle_long($self, $now));