1 # Copyright (C) 2015-2018 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 rbuf ng long_res);
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
48 foreach my $nntp (@$q) {
49 # for request && response protocols, always finish writing
50 # before finishing reading:
51 if (my $long_cb = $nntp->{long_res}) {
52 $nntp->write($long_cb);
54 # pipelined request, we bypassed socket-readiness
63 $nextt ||= PublicInbox::EvCleanup::asap(*next_tick);
66 sub update_idle_time ($) {
68 my $sock = $self->{sock} or return;
69 $EXPMAP->{fileno($sock)} = [ now(), $self ];
75 my $old = $now - $exp;
78 while (my ($fd, $v) = each %$EXPMAP) {
79 my ($idle_time, $nntp) = @$v;
80 if ($idle_time < $old) {
81 $nntp->close; # idempotent
89 $expt = PublicInbox::EvCleanup::later(*expire_old);
92 # noop to kick outselves out of the loop ASAP so descriptors
94 PublicInbox::EvCleanup::asap(sub {});
99 my ($class, $sock, $nntpd) = @_;
100 my $self = fields::new($class);
101 $self->SUPER::new($sock, EPOLLIN | EPOLLONESHOT);
102 $self->{nntpd} = $nntpd;
103 res($self, '201 ' . $nntpd->{servername} . ' ready - post via email');
105 update_idle_time($self);
106 $expt ||= PublicInbox::EvCleanup::later(*expire_old);
111 my ($cb, $argc) = @_;
112 my $tot = prototype $cb;
113 my ($nreq, undef) = split(';', $tot);
114 $nreq = ($nreq =~ tr/$//) - 1;
115 $tot = ($tot =~ tr/$//) - 1;
116 ($argc <= $tot && $argc >= $nreq);
119 # returns 1 if we can continue, 0 if not due to buffered writes or disconnect
120 sub process_line ($$) {
122 my ($req, @args) = split(/[ \t]/, $l);
123 return 1 unless defined($req); # skip blank line
127 $req = $DISABLED{$req} ? undef : *{'cmd_'.$req}{CODE};
129 return res($self, '500 command not recognized') unless $req;
130 return res($self, r501) unless args_ok($req, scalar @args);
132 my $res = eval { $req->($self, @args) };
134 if ($err && $self->{sock}) {
137 err($self, 'error from: %s (%s)', $l, $err);
138 $res = '503 program fault - command not performed';
140 return 0 unless defined $res;
145 my ($self, $arg) = @_;
147 return r501 unless $arg eq 'READER';
148 '201 Posting prohibited';
151 sub cmd_slave ($) { '202 slave status noted' }
153 sub cmd_xgtitle ($;$) {
154 my ($self, $wildmat) = @_;
155 more($self, '282 list of groups and descriptions follows');
156 list_newsgroups($self, $wildmat);
160 sub list_overview_fmt ($) {
162 msg_more($self, $OVERVIEW_FMT);
165 sub list_headers ($;$) {
167 msg_more($self, $LIST_HEADERS);
170 sub list_active ($;$) {
171 my ($self, $wildmat) = @_;
172 wildmat2re($wildmat);
173 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
174 $ng->{newsgroup} =~ $wildmat or next;
175 group_line($self, $ng);
179 sub list_active_times ($;$) {
180 my ($self, $wildmat) = @_;
181 wildmat2re($wildmat);
182 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
183 $ng->{newsgroup} =~ $wildmat or next;
184 my $c = eval { $ng->mm->created_at } || time;
185 more($self, "$ng->{newsgroup} $c $ng->{-primary_address}");
189 sub list_newsgroups ($;$) {
190 my ($self, $wildmat) = @_;
191 wildmat2re($wildmat);
192 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
193 $ng->{newsgroup} =~ $wildmat or next;
194 my $d = $ng->description;
195 more($self, "$ng->{newsgroup} $d");
199 # LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported
200 sub cmd_list ($;$$) {
201 my ($self, @args) = @_;
203 my $arg = shift @args;
204 $arg =~ tr/A-Z./a-z_/;
206 return r501 if $DISABLED{$arg};
212 return r501 unless $arg && args_ok($arg, scalar @args);
213 more($self, '215 information follows');
214 $arg->($self, @args);
216 more($self, '215 list of newsgroups follows');
217 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
218 group_line($self, $ng);
224 sub cmd_listgroup ($;$) {
225 my ($self, $group) = @_;
226 if (defined $group) {
227 my $res = cmd_group($self, $group);
228 return $res if ($res !~ /\A211 /);
232 $self->{ng} or return '412 no newsgroup selected';
234 long_response($self, sub {
235 my $ary = $self->{ng}->mm->ids_after(\$n);
236 scalar @$ary or return;
237 more($self, join("\r\n", @$ary));
242 sub parse_time ($$;$) {
243 my ($date, $time, $gmt) = @_;
244 my ($hh, $mm, $ss) = unpack('A2A2A2', $time);
246 $gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt";
249 my @now = $gmt ? gmtime : localtime;
250 my ($YYYY, $MM, $DD);
251 if (bytes::length($date) == 8) { # RFC 3977 allows YYYYMMDD
252 ($YYYY, $MM, $DD) = unpack('A4A2A2', $date);
253 } else { # legacy clients send YYMMDD
254 ($YYYY, $MM, $DD) = unpack('A2A2A2', $date);
255 my $cur_year = $now[5] + 1900;
256 if ($YYYY > $cur_year) {
257 $YYYY += int($cur_year / 1000) * 1000 - 100;
261 timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
263 timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
267 sub group_line ($$) {
268 my ($self, $ng) = @_;
269 my ($min, $max) = $ng->mm->minmax;
270 more($self, "$ng->{newsgroup} $max $min n") if defined $min && defined $max;
273 sub cmd_newgroups ($$$;$$) {
274 my ($self, $date, $time, $gmt, $dists) = @_;
275 my $ts = eval { parse_time($date, $time, $gmt) };
279 more($self, '231 list of new newsgroups follows');
280 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
281 my $c = eval { $ng->mm->created_at } || 0;
282 next unless $c > $ts;
283 group_line($self, $ng);
288 sub wildmat2re (;$) {
289 return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*');
294 $tmp =~ s#(?<!\\)\[(.+)(?<!\\)\]#
296 my $key = sha1_hex($orig . $salt);
297 $orig =~ s/([^\w\-])+/\Q$1/g;
301 my %map = ('*' => '.*', '?' => '.' );
302 $tmp =~ s#(?<!\\)([^\w\\])#$map{$1} || "\Q$1"#ge;
304 $tmp =~ s#([a-f0-9]{40})#
305 my $orig = $keep{$1};
306 defined $orig ? $orig : $1;
309 $_[0] = qr/\A$tmp\z/;
313 return $_[0] = qr/\A\z/ unless defined $_[0];
314 my %map = ('*' => '.*', ',' => '|');
315 $_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge;
316 $_[0] = qr/\A(?:$_[0])\z/;
319 sub cmd_newnews ($$$$;$$) {
320 my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_;
321 my $ts = eval { parse_time($date, $time, $gmt) };
323 more($self, '230 list of new articles by message-id follows');
324 my ($keep, $skip) = split('!', $newsgroups, 2);
328 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
329 $ng->{newsgroup} =~ $keep or next;
330 $ng->{newsgroup} =~ $skip and next;
331 my $over = $ng->over or next;
334 return '.' unless @over;
337 long_response($self, sub {
339 my $msgs = $over->query_ts($ts, $prev);
342 join(">\r\n<", map { $_->mid } @$msgs ).
344 $prev = $msgs->[-1]->{num};
347 if (@over) { # continue onto next newsgroup
350 } else { # break out of the long response.
358 my ($self, $group) = @_;
359 my $no_such = '411 no such news group';
360 my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such;
363 my ($min, $max) = $ng->mm->minmax;
366 $self->{article} = $min;
367 my $est_size = $max - $min;
368 "211 $est_size $min $max $group";
371 sub article_adj ($$) {
372 my ($self, $off) = @_;
373 my $ng = $self->{ng} or return '412 no newsgroup selected';
375 my $n = $self->{article};
376 defined $n or return '420 no current article has been selected';
379 my $mid = $ng->mm->mid_for($n);
381 $n = $off > 0 ? 'next' : 'previous';
382 return "421 no $n article in this group";
384 $self->{article} = $n;
385 "223 $n <$mid> article retrieved - request text separately";
388 sub cmd_next ($) { article_adj($_[0], 1) }
389 sub cmd_last ($) { article_adj($_[0], -1) }
391 # We want to encourage using email and CC-ing everybody involved to avoid
392 # the single-point-of-failure a single server provides.
395 my $ng = $self->{ng};
396 $ng ? "440 mailto:$ng->{-primary_address} to post"
397 : '440 posting not allowed'
402 res($self, '205 closing connection - goodbye!');
407 sub header_append ($$$) {
408 my ($hdr, $k, $v) = @_;
409 my @v = $hdr->header($k);
413 $hdr->header_set($k, @v, $v);
417 my ($self, $ng, $n, $mid) = @_;
418 my $ret = $self->{nntpd}->{servername} . " $ng->{newsgroup}:$n";
420 # num_for is pretty cheap and sometimes we'll lookup the existence
421 # of an article without getting even the OVER info. In other words,
422 # I'm not sure if its worth optimizing by scanning To:/Cc: and
423 # PublicInbox::ExtMsg on the PSGI end is just as expensive
424 foreach my $other (@{$self->{nntpd}->{grouplist}}) {
425 next if $ng eq $other;
426 my $num = eval { $other->mm->num_for($mid) } or next;
427 $ret .= " $other->{newsgroup}:$num";
432 sub set_nntp_headers ($$$$$) {
433 my ($self, $hdr, $ng, $n, $mid) = @_;
435 # why? leafnode requires a Path: header for some inexplicable
436 # reason. We'll fake the shortest one possible.
437 $hdr->header_set('Path', 'y');
439 # leafnode (and maybe other NNTP clients) have trouble dealing
440 # with v2 messages which have multiple Message-IDs (either due
441 # to our own content-based dedupe or buggy git-send-email versions).
442 my @mids = $hdr->header('Message-ID');
443 if (scalar(@mids) > 1) {
445 $hdr->header_set('Message-ID', $mid0);
446 my @alt = $hdr->header('X-Alt-Message-ID');
447 my %seen = map { $_ => 1 } (@alt, $mid0);
448 foreach my $m (@mids) {
452 $hdr->header_set('X-Alt-Message-ID', @alt);
456 my $xref = xref($self, $ng, $n, $mid);
457 $hdr->header_set('Xref', $xref);
458 $xref =~ s/:[0-9]+//g;
459 $hdr->header_set('Newsgroups', (split(/ /, $xref, 2))[1]);
460 header_append($hdr, 'List-Post', "<mailto:$ng->{-primary_address}>");
461 if (my $url = $ng->base_url) {
462 $mid = mid_escape($mid);
463 header_append($hdr, 'Archived-At', "<$url$mid/>");
464 header_append($hdr, 'List-Archive', "<$url>");
468 sub art_lookup ($$$) {
469 my ($self, $art, $set_headers) = @_;
470 my $ng = $self->{ng};
474 if ($art =~ /\A[0-9]+\z/) {
475 $err = '423 no such article number in this group';
478 } elsif ($art =~ /\A<([^>]+)>\z/) {
481 $n = $ng->mm->num_for($mid) if $ng;
482 goto found if defined $n;
483 foreach my $g (values %{$self->{nntpd}->{groups}}) {
484 $n = $g->mm->num_for($mid);
495 $err = '420 no current article has been selected';
496 $n = $self->{article};
497 defined $n or return $err;
499 $ng or return '412 no newsgroup has been selected';
500 $mid = $ng->mm->mid_for($n);
501 defined $mid or return $err;
504 my $smsg = $ng->over->get_art($n) or return $err;
505 my $msg = $ng->msg_by_smsg($smsg) or return $err;
506 my $s = Email::Simple->new($msg);
508 set_nntp_headers($self, $s->header_obj, $ng, $n, $mid);
511 $s->body_set('') if ($set_headers == 2);
513 [ $n, $mid, $s, $smsg->bytes, $smsg->lines, $ng ];
516 sub simple_body_write ($$) {
520 $body =~ s/^\./../smg;
521 $body =~ s/(?<!\r)\n/\r\n/sg;
522 msg_more($self, $body);
523 msg_more($self, "\r\n") unless $body =~ /\r\n\z/s;
528 my ($self, $art) = @_;
529 $self->{article} = $art if defined $art && $art =~ /\A[0-9]+\z/;
533 my $hdr = $_[0]->header_obj->as_string;
535 $hdr =~ s/(?<!\r)\n/\r\n/sg;
537 # for leafnode compatibility, we need to ensure Message-ID headers
538 # are only a single line. We can't subclass Email::Simple::Header
539 # and override _default_fold_at in here, either; since that won't
540 # affect messages already in the archive.
541 $hdr =~ s/^(Message-ID:)[ \t]*\r\n[ \t]+([^\r]+)\r\n/$1 $2\r\n/igsm;
546 sub cmd_article ($;$) {
547 my ($self, $art) = @_;
548 my $r = art_lookup($self, $art, 1);
549 return $r unless ref $r;
550 my ($n, $mid, $s) = @$r;
551 set_art($self, $art);
552 more($self, "220 $n <$mid> article retrieved - head and body follow");
553 msg_more($self, _header($s));
554 msg_more($self, "\r\n");
555 simple_body_write($self, $s);
559 my ($self, $art) = @_;
560 my $r = art_lookup($self, $art, 2);
561 return $r unless ref $r;
562 my ($n, $mid, $s) = @$r;
563 set_art($self, $art);
564 more($self, "221 $n <$mid> article retrieved - head follows");
565 msg_more($self, _header($s));
570 my ($self, $art) = @_;
571 my $r = art_lookup($self, $art, 0);
572 return $r unless ref $r;
573 my ($n, $mid, $s) = @$r;
574 set_art($self, $art);
575 more($self, "222 $n <$mid> article retrieved - body follows");
576 simple_body_write($self, $s);
580 my ($self, $art) = @_;
581 my $r = art_lookup($self, $art, 0);
582 return $r unless ref $r;
583 my ($n, $mid, undef) = @$r;
584 set_art($self, $art);
585 "223 $n <$mid> article retrieved - request text separately";
588 sub cmd_ihave ($) { '435 article not wanted - do not send it' }
590 sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) }
594 more($self, '100 help text follows');
599 my ($self, $range) = @_;
600 my $ng = $self->{ng} or return '412 no news group has been selected';
601 defined $range or return '420 No article(s) selected';
603 my ($min, $max) = $ng->mm->minmax;
604 if ($range =~ /\A([0-9]+)\z/) {
606 } elsif ($range =~ /\A([0-9]+)-\z/) {
607 ($beg, $end) = ($1, $max);
608 } elsif ($range =~ /\A([0-9]+)-([0-9]+)\z/) {
609 ($beg, $end) = ($1, $2);
613 $beg = $min if ($beg < $min);
614 $end = $max if ($end > $max);
615 return '420 No article(s) selected' if ($beg > $end);
619 sub long_response ($$) {
620 my ($self, $cb) = @_;
621 die "BUG: nested long response" if $self->{long_res};
623 my $fd = fileno($self->{sock});
624 defined $fd or return;
625 # make sure we disable reading during a long response,
626 # clients should not be sending us stuff and making us do more
627 # work while we are stream a response to them
629 $self->{long_res} = sub {
630 my $more = eval { $cb->() };
631 if ($@ || !$self->{sock}) { # something bad happened...
632 delete $self->{long_res};
636 "%s during long response[$fd] - %0.6f",
640 update_idle_time($self);
643 out($self, " deferred[$fd] aborted - %0.6f",
646 } elsif ($more) { # $self->{wbuf}:
647 # no recursion, schedule another call ASAP
648 # but only after all pending writes are done
649 update_idle_time($self);
652 delete $self->{long_res};
654 out($self, " deferred[$fd] done - %0.6f", now() - $t0);
658 $self->{long_res}->(); # kick off!
662 sub hdr_message_id ($$$) { # optimize XHDR Message-ID [range] for slrnpull.
663 my ($self, $xhdr, $range) = @_;
665 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
666 my ($ng, $n) = mid_lookup($self, $1);
667 return r430 unless $n;
668 hdr_mid_response($self, $xhdr, $ng, $n, $range, $range);
669 } else { # numeric range
670 $range = $self->{article} unless defined $range;
671 my $r = get_range($self, $range);
672 return $r unless ref $r;
673 my $mm = $self->{ng}->mm;
674 my ($beg, $end) = @$r;
675 more($self, $xhdr ? r221 : r225);
676 long_response($self, sub {
677 my $r = $mm->msg_range(\$beg, $end);
679 more($self, join("\r\n", map {
687 sub mid_lookup ($$) {
688 my ($self, $mid) = @_;
689 my $self_ng = $self->{ng};
691 my $n = $self_ng->mm->num_for($mid);
692 return ($self_ng, $n) if defined $n;
694 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
695 next if defined $self_ng && $ng eq $self_ng;
696 my $n = $ng->mm->num_for($mid);
697 return ($ng, $n) if defined $n;
702 sub hdr_xref ($$$) { # optimize XHDR Xref [range] for rtin
703 my ($self, $xhdr, $range) = @_;
705 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
707 my ($ng, $n) = mid_lookup($self, $mid);
708 return r430 unless $n;
709 hdr_mid_response($self, $xhdr, $ng, $n, $range,
710 xref($self, $ng, $n, $mid));
711 } else { # numeric range
712 $range = $self->{article} unless defined $range;
713 my $r = get_range($self, $range);
714 return $r unless ref $r;
715 my $ng = $self->{ng};
717 my ($beg, $end) = @$r;
718 more($self, $xhdr ? r221 : r225);
719 long_response($self, sub {
720 my $r = $mm->msg_range(\$beg, $end);
722 more($self, join("\r\n", map {
724 "$num ".xref($self, $ng, $num, $_->[1]);
731 sub over_header_for {
732 my ($over, $num, $field) = @_;
733 my $smsg = $over->get_art($num) or return;
734 return PublicInbox::SearchMsg::date($smsg) if $field eq 'date';
738 sub hdr_searchmsg ($$$$) {
739 my ($self, $xhdr, $field, $range) = @_;
740 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
741 my ($ng, $n) = mid_lookup($self, $1);
742 return r430 unless defined $n;
743 my $v = over_header_for($ng->over, $n, $field);
744 hdr_mid_response($self, $xhdr, $ng, $n, $range, $v);
745 } else { # numeric range
746 $range = $self->{article} unless defined $range;
747 my $over = $self->{ng}->over;
748 my $mm = $self->{ng}->mm;
749 my $r = get_range($self, $range);
750 return $r unless ref $r;
751 my ($beg, $end) = @$r;
752 more($self, $xhdr ? r221 : r225);
754 long_response($self, sub {
755 my $msgs = $over->query_xover($cur, $end);
756 my $nr = scalar @$msgs or return;
758 foreach my $s (@$msgs) {
759 $tmp .= $s->{num} . ' ' . $s->$field . "\r\n";
762 msg_more($self, $tmp);
763 $cur = $msgs->[-1]->{num} + 1;
769 my ($self, $xhdr, $header, $range) = @_;
770 my $sub = lc $header;
771 if ($sub eq 'message-id') {
772 hdr_message_id($self, $xhdr, $range);
773 } elsif ($sub eq 'xref') {
774 hdr_xref($self, $xhdr, $range);
775 } elsif ($sub =~ /\A(?:subject|references|date|from|to|cc|
777 hdr_searchmsg($self, $xhdr, $sub, $range);
778 } elsif ($sub =~ /\A:(bytes|lines)\z/) {
779 hdr_searchmsg($self, $xhdr, $1, $range);
781 $xhdr ? (r221 . "\r\n.") : "503 HDR not permitted on $header";
787 my ($self, $header, $range) = @_;
788 do_hdr($self, 0, $header, $range);
792 sub cmd_xhdr ($$;$) {
793 my ($self, $header, $range) = @_;
794 do_hdr($self, 1, $header, $range);
797 sub hdr_mid_prefix ($$$$$) {
798 my ($self, $xhdr, $ng, $n, $mid) = @_;
799 return $mid if $xhdr;
801 # HDR for RFC 3977 users
802 if (my $self_ng = $self->{ng}) {
803 ($self_ng eq $ng) ? $n : '0';
809 sub hdr_mid_response ($$$$$$) {
810 my ($self, $xhdr, $ng, $n, $mid, $v) = @_; # r: art_lookup result
813 $res .= r221 . "\r\n";
814 $res .= "$mid $v\r\n";
816 $res .= r225 . "\r\n";
817 my $pfx = hdr_mid_prefix($self, $xhdr, $ng, $n, $mid);
818 $res .= "$pfx $v\r\n";
820 res($self, $res .= '.');
824 sub cmd_xrover ($;$) {
825 my ($self, $range) = @_;
826 my $ng = $self->{ng} or return '412 no newsgroup selected';
827 (defined $range && $range =~ /[<>]/) and
828 return '420 No article(s) selected'; # no message IDs
830 $range = $self->{article} unless defined $range;
831 my $r = get_range($self, $range);
832 return $r unless ref $r;
833 my ($beg, $end) = @$r;
835 my $over = $ng->over;
836 more($self, '224 Overview information follows');
838 long_response($self, sub {
839 my $h = over_header_for($over, $beg, 'references');
840 more($self, "$beg $h") if defined($h);
845 sub over_line ($$$$) {
846 my ($self, $ng, $num, $smsg) = @_;
847 # n.b. field access and procedural calls can be
848 # 10%-15% faster than OO method calls:
849 my $s = join("\t", $num,
852 PublicInbox::SearchMsg::date($smsg),
857 "Xref: " . xref($self, $ng, $num, $smsg->{mid}));
863 my ($self, $range) = @_;
864 if ($range && $range =~ /\A<(.+)>\z/) {
865 my ($ng, $n) = mid_lookup($self, $1);
866 defined $n or return r430;
867 my $smsg = $ng->over->get_art($n) or return r430;
868 more($self, '224 Overview information follows (multi-line)');
870 # Only set article number column if it's the current group
871 my $self_ng = $self->{ng};
872 $n = 0 if (!$self_ng || $self_ng ne $ng);
873 more($self, over_line($self, $ng, $n, $smsg));
876 cmd_xover($self, $range);
880 sub cmd_xover ($;$) {
881 my ($self, $range) = @_;
882 $range = $self->{article} unless defined $range;
883 my $r = get_range($self, $range);
884 return $r unless ref $r;
885 my ($beg, $end) = @$r;
886 more($self, "224 Overview information follows for $beg to $end");
887 my $over = $self->{ng}->over;
889 long_response($self, sub {
890 my $msgs = $over->query_xover($cur, $end);
891 my $nr = scalar @$msgs or return;
894 more($self, join("\r\n", map {
895 over_line($self, $self->{ng}, $_->{num}, $_);
897 $cur = $msgs->[-1]->{num} + 1;
902 my ($self, $mid) = @_;
903 return r501 unless $mid =~ /\A<(.+)>\z/;
906 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
907 my $n = $ng->mm->num_for($mid);
908 push @paths, "$ng->{newsgroup}/$n" if defined $n;
910 return '430 no such article on server' unless @paths;
911 '223 '.join(' ', @paths);
914 sub res ($$) { do_write($_[0], $_[1] . "\r\n") }
916 sub more ($$) { msg_more($_[0], $_[1] . "\r\n") }
920 my $done = $self->write(\($_[1]));
921 return 0 unless $self->{sock};
927 my ($self, $fmt, @args) = @_;
928 printf { $self->{nntpd}->{err} } $fmt."\n", @args;
932 my ($self, $fmt, @args) = @_;
933 printf { $self->{nntpd}->{out} } $fmt."\n", @args;
936 # callback used by PublicInbox::DS for any (e)poll (in/out/hup/err)
940 return unless $self->flush_write && $self->{sock};
942 update_idle_time($self);
943 # only read more requests if we've drained the write buffer,
944 # otherwise we can be buffering infinitely w/o backpressure
946 use constant LINE_MAX => 512; # RFC 977 section 2.3
947 my $rbuf = \($self->{rbuf});
950 if (index($$rbuf, "\n") < 0) {
951 my $off = bytes::length($$rbuf);
952 $r = $self->do_read($rbuf, LINE_MAX, $off) or return;
954 while ($r > 0 && $$rbuf =~ s/\A[ \t\r\n]*([^\r\n]*)\r?\n//) {
956 return $self->close if $line =~ /[[:cntrl:]]/s;
958 my $fd = fileno($self->{sock});
959 $r = eval { process_line($self, $line) };
960 my $d = $self->{long_res} ?
961 " deferred[$fd]" : '';
962 out($self, "[$fd] %s - %0.6f$d", $line, now() - $t0);
965 return $self->close if $r < 0;
966 my $len = bytes::length($$rbuf);
967 return $self->close if ($len >= LINE_MAX);
968 update_idle_time($self);
970 # maybe there's more pipelined data, or we'll have
971 # to register it for socket-readiness notifications
972 requeue($self) unless ($self->{long_res} || $self->{wbuf});
975 sub not_idle_long ($$) {
976 my ($self, $now) = @_;
977 my $sock = $self->{sock} or return;
978 my $ary = $EXPMAP->{fileno($sock)} or return;
979 my $exp_at = $ary->[0] + $EXPTIME;
983 # for graceful shutdown in PublicInbox::Daemon:
985 my ($self, $now) = @_;
986 ($self->{rbuf} ne '' || $self->{long_res} ||
987 $self->{wbuf} || not_idle_long($self, $now));