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 use Time::HiRes qw(clock_gettime CLOCK_MONOTONIC);
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',
28 sub now () { clock_gettime(CLOCK_MONOTONIC) };
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
58 # maybe there's more pipelined data, or we'll have
59 # to register it for socket-readiness notifications
60 if (!$nntp->{long_res} && !$nntp->{closed}) {
67 sub update_idle_time ($) {
69 my $sock = $self->{sock} or return;
70 my $fd = fileno($sock);
71 defined $fd and $EXPMAP->{$fd} = [ now(), $self ];
77 my $old = $now - $exp;
80 while (my ($fd, $v) = each %$EXPMAP) {
81 my ($idle_time, $nntp) = @$v;
82 if ($idle_time < $old) {
83 $nntp->close; # idempotent
91 $expt = PublicInbox::EvCleanup::later(*expire_old);
94 # noop to kick outselves out of the loop ASAP so descriptors
96 PublicInbox::EvCleanup::asap(sub {});
101 my ($class, $sock, $nntpd) = @_;
102 my $self = fields::new($class);
103 $self->SUPER::new($sock);
104 $self->{nntpd} = $nntpd;
105 res($self, '201 ' . $nntpd->{servername} . ' ready - post via email');
107 $self->watch_read(1);
108 update_idle_time($self);
109 $expt ||= PublicInbox::EvCleanup::later(*expire_old);
114 my ($cb, $argc) = @_;
115 my $tot = prototype $cb;
116 my ($nreq, undef) = split(';', $tot);
117 $nreq = ($nreq =~ tr/$//) - 1;
118 $tot = ($tot =~ tr/$//) - 1;
119 ($argc <= $tot && $argc >= $nreq);
122 # returns 1 if we can continue, 0 if not due to buffered writes or disconnect
123 sub process_line ($$) {
125 my ($req, @args) = split(/[ \t]/, $l);
126 return 1 unless defined($req); # skip blank line
130 $req = $DISABLED{$req} ? undef : *{'cmd_'.$req}{CODE};
132 return res($self, '500 command not recognized') unless $req;
133 return res($self, r501) unless args_ok($req, scalar @args);
135 my $res = eval { $req->($self, @args) };
137 if ($err && !$self->{closed}) {
140 err($self, 'error from: %s (%s)', $l, $err);
141 $res = '503 program fault - command not performed';
143 return 0 unless defined $res;
148 my ($self, $arg) = @_;
150 return r501 unless $arg eq 'READER';
151 '201 Posting prohibited';
154 sub cmd_slave ($) { '202 slave status noted' }
156 sub cmd_xgtitle ($;$) {
157 my ($self, $wildmat) = @_;
158 more($self, '282 list of groups and descriptions follows');
159 list_newsgroups($self, $wildmat);
163 sub list_overview_fmt ($) {
165 do_more($self, $OVERVIEW_FMT);
168 sub list_headers ($;$) {
170 do_more($self, $LIST_HEADERS);
173 sub list_active ($;$) {
174 my ($self, $wildmat) = @_;
175 wildmat2re($wildmat);
176 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
177 $ng->{newsgroup} =~ $wildmat or next;
178 group_line($self, $ng);
182 sub list_active_times ($;$) {
183 my ($self, $wildmat) = @_;
184 wildmat2re($wildmat);
185 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
186 $ng->{newsgroup} =~ $wildmat or next;
187 my $c = eval { $ng->mm->created_at } || time;
188 more($self, "$ng->{newsgroup} $c $ng->{-primary_address}");
192 sub list_newsgroups ($;$) {
193 my ($self, $wildmat) = @_;
194 wildmat2re($wildmat);
195 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
196 $ng->{newsgroup} =~ $wildmat or next;
197 my $d = $ng->description;
198 more($self, "$ng->{newsgroup} $d");
202 # LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported
203 sub cmd_list ($;$$) {
204 my ($self, @args) = @_;
206 my $arg = shift @args;
207 $arg =~ tr/A-Z./a-z_/;
209 return r501 if $DISABLED{$arg};
215 return r501 unless $arg && args_ok($arg, scalar @args);
216 more($self, '215 information follows');
217 $arg->($self, @args);
219 more($self, '215 list of newsgroups follows');
220 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
221 group_line($self, $ng);
227 sub cmd_listgroup ($;$) {
228 my ($self, $group) = @_;
229 if (defined $group) {
230 my $res = cmd_group($self, $group);
231 return $res if ($res !~ /\A211 /);
235 $self->{ng} or return '412 no newsgroup selected';
237 long_response($self, sub {
238 my $ary = $self->{ng}->mm->ids_after(\$n);
239 scalar @$ary or return;
240 more($self, join("\r\n", @$ary));
245 sub parse_time ($$;$) {
246 my ($date, $time, $gmt) = @_;
247 my ($hh, $mm, $ss) = unpack('A2A2A2', $time);
249 $gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt";
252 my @now = $gmt ? gmtime : localtime;
253 my ($YYYY, $MM, $DD);
254 if (length($date) == 8) { # RFC 3977 allows YYYYMMDD
255 ($YYYY, $MM, $DD) = unpack('A4A2A2', $date);
256 } else { # legacy clients send YYMMDD
257 ($YYYY, $MM, $DD) = unpack('A2A2A2', $date);
258 my $cur_year = $now[5] + 1900;
259 if ($YYYY > $cur_year) {
260 $YYYY += int($cur_year / 1000) * 1000 - 100;
264 timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
266 timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
270 sub group_line ($$) {
271 my ($self, $ng) = @_;
272 my ($min, $max) = $ng->mm->minmax;
273 more($self, "$ng->{newsgroup} $max $min n") if defined $min && defined $max;
276 sub cmd_newgroups ($$$;$$) {
277 my ($self, $date, $time, $gmt, $dists) = @_;
278 my $ts = eval { parse_time($date, $time, $gmt) };
282 more($self, '231 list of new newsgroups follows');
283 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
284 my $c = eval { $ng->mm->created_at } || 0;
285 next unless $c > $ts;
286 group_line($self, $ng);
291 sub wildmat2re (;$) {
292 return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*');
297 $tmp =~ s#(?<!\\)\[(.+)(?<!\\)\]#
299 my $key = sha1_hex($orig . $salt);
300 $orig =~ s/([^\w\-])+/\Q$1/g;
304 my %map = ('*' => '.*', '?' => '.' );
305 $tmp =~ s#(?<!\\)([^\w\\])#$map{$1} || "\Q$1"#ge;
307 $tmp =~ s#([a-f0-9]{40})#
308 my $orig = $keep{$1};
309 defined $orig ? $orig : $1;
312 $_[0] = qr/\A$tmp\z/;
316 return $_[0] = qr/\A\z/ unless defined $_[0];
317 my %map = ('*' => '.*', ',' => '|');
318 $_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge;
319 $_[0] = qr/\A(?:$_[0])\z/;
322 sub cmd_newnews ($$$$;$$) {
323 my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_;
324 my $ts = eval { parse_time($date, $time, $gmt) };
326 more($self, '230 list of new articles by message-id follows');
327 my ($keep, $skip) = split('!', $newsgroups, 2);
331 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
332 $ng->{newsgroup} =~ $keep or next;
333 $ng->{newsgroup} =~ $skip and next;
334 my $over = $ng->over or next;
337 return '.' unless @over;
340 long_response($self, sub {
342 my $msgs = $over->query_ts($ts, $prev);
345 join(">\r\n<", map { $_->mid } @$msgs ).
347 $prev = $msgs->[-1]->{num};
350 if (@over) { # continue onto next newsgroup
353 } else { # break out of the long response.
361 my ($self, $group) = @_;
362 my $no_such = '411 no such news group';
363 my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such;
366 my ($min, $max) = $ng->mm->minmax;
369 $self->{article} = $min;
370 my $est_size = $max - $min;
371 "211 $est_size $min $max $group";
374 sub article_adj ($$) {
375 my ($self, $off) = @_;
376 my $ng = $self->{ng} or return '412 no newsgroup selected';
378 my $n = $self->{article};
379 defined $n or return '420 no current article has been selected';
382 my $mid = $ng->mm->mid_for($n);
384 $n = $off > 0 ? 'next' : 'previous';
385 return "421 no $n article in this group";
387 $self->{article} = $n;
388 "223 $n <$mid> article retrieved - request text separately";
391 sub cmd_next ($) { article_adj($_[0], 1) }
392 sub cmd_last ($) { article_adj($_[0], -1) }
394 # We want to encourage using email and CC-ing everybody involved to avoid
395 # the single-point-of-failure a single server provides.
398 my $ng = $self->{ng};
399 $ng ? "440 mailto:$ng->{-primary_address} to post"
400 : '440 posting not allowed'
405 res($self, '205 closing connection - goodbye!');
410 sub header_append ($$$) {
411 my ($hdr, $k, $v) = @_;
412 my @v = $hdr->header($k);
416 $hdr->header_set($k, @v, $v);
420 my ($self, $ng, $n, $mid) = @_;
421 my $ret = $self->{nntpd}->{servername} . " $ng->{newsgroup}:$n";
423 # num_for is pretty cheap and sometimes we'll lookup the existence
424 # of an article without getting even the OVER info. In other words,
425 # I'm not sure if its worth optimizing by scanning To:/Cc: and
426 # PublicInbox::ExtMsg on the PSGI end is just as expensive
427 foreach my $other (@{$self->{nntpd}->{grouplist}}) {
428 next if $ng eq $other;
429 my $num = eval { $other->mm->num_for($mid) } or next;
430 $ret .= " $other->{newsgroup}:$num";
435 sub set_nntp_headers ($$$$$) {
436 my ($self, $hdr, $ng, $n, $mid) = @_;
438 # why? leafnode requires a Path: header for some inexplicable
439 # reason. We'll fake the shortest one possible.
440 $hdr->header_set('Path', 'y');
442 # leafnode (and maybe other NNTP clients) have trouble dealing
443 # with v2 messages which have multiple Message-IDs (either due
444 # to our own content-based dedupe or buggy git-send-email versions).
445 my @mids = $hdr->header('Message-ID');
446 if (scalar(@mids) > 1) {
448 $hdr->header_set('Message-ID', $mid0);
449 my @alt = $hdr->header('X-Alt-Message-ID');
450 my %seen = map { $_ => 1 } (@alt, $mid0);
451 foreach my $m (@mids) {
455 $hdr->header_set('X-Alt-Message-ID', @alt);
459 my $xref = xref($self, $ng, $n, $mid);
460 $hdr->header_set('Xref', $xref);
461 $xref =~ s/:[0-9]+//g;
462 $hdr->header_set('Newsgroups', (split(/ /, $xref, 2))[1]);
463 header_append($hdr, 'List-Post', "<mailto:$ng->{-primary_address}>");
464 if (my $url = $ng->base_url) {
465 $mid = mid_escape($mid);
466 header_append($hdr, 'Archived-At', "<$url$mid/>");
467 header_append($hdr, 'List-Archive', "<$url>");
471 sub art_lookup ($$$) {
472 my ($self, $art, $set_headers) = @_;
473 my $ng = $self->{ng};
477 if ($art =~ /\A[0-9]+\z/) {
478 $err = '423 no such article number in this group';
481 } elsif ($art =~ /\A<([^>]+)>\z/) {
484 $n = $ng->mm->num_for($mid) if $ng;
485 goto found if defined $n;
486 foreach my $g (values %{$self->{nntpd}->{groups}}) {
487 $n = $g->mm->num_for($mid);
498 $err = '420 no current article has been selected';
499 $n = $self->{article};
500 defined $n or return $err;
502 $ng or return '412 no newsgroup has been selected';
503 $mid = $ng->mm->mid_for($n);
504 defined $mid or return $err;
507 my $smsg = $ng->over->get_art($n) or return $err;
508 my $msg = $ng->msg_by_smsg($smsg) or return $err;
509 my $s = Email::Simple->new($msg);
511 set_nntp_headers($self, $s->header_obj, $ng, $n, $mid);
514 $s->body_set('') if ($set_headers == 2);
516 [ $n, $mid, $s, $smsg->bytes, $smsg->lines, $ng ];
519 sub simple_body_write ($$) {
523 $body =~ s/^\./../smg;
524 $body =~ s/(?<!\r)\n/\r\n/sg;
525 do_more($self, $body);
526 do_more($self, "\r\n") unless $body =~ /\r\n\z/s;
531 my ($self, $art) = @_;
532 $self->{article} = $art if defined $art && $art =~ /\A[0-9]+\z/;
536 my $hdr = $_[0]->header_obj->as_string;
538 $hdr =~ s/(?<!\r)\n/\r\n/sg;
540 # for leafnode compatibility, we need to ensure Message-ID headers
541 # are only a single line. We can't subclass Email::Simple::Header
542 # and override _default_fold_at in here, either; since that won't
543 # affect messages already in the archive.
544 $hdr =~ s/^(Message-ID:)[ \t]*\r\n[ \t]+([^\r]+)\r\n/$1 $2\r\n/igsm;
549 sub cmd_article ($;$) {
550 my ($self, $art) = @_;
551 my $r = art_lookup($self, $art, 1);
552 return $r unless ref $r;
553 my ($n, $mid, $s) = @$r;
554 set_art($self, $art);
555 more($self, "220 $n <$mid> article retrieved - head and body follow");
556 do_more($self, _header($s));
557 do_more($self, "\r\n");
558 simple_body_write($self, $s);
562 my ($self, $art) = @_;
563 my $r = art_lookup($self, $art, 2);
564 return $r unless ref $r;
565 my ($n, $mid, $s) = @$r;
566 set_art($self, $art);
567 more($self, "221 $n <$mid> article retrieved - head follows");
568 do_more($self, _header($s));
573 my ($self, $art) = @_;
574 my $r = art_lookup($self, $art, 0);
575 return $r unless ref $r;
576 my ($n, $mid, $s) = @$r;
577 set_art($self, $art);
578 more($self, "222 $n <$mid> article retrieved - body follows");
579 simple_body_write($self, $s);
583 my ($self, $art) = @_;
584 my $r = art_lookup($self, $art, 0);
585 return $r unless ref $r;
586 my ($n, $mid, undef) = @$r;
587 set_art($self, $art);
588 "223 $n <$mid> article retrieved - request text separately";
591 sub cmd_ihave ($) { '435 article not wanted - do not send it' }
593 sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) }
597 more($self, '100 help text follows');
602 my ($self, $range) = @_;
603 my $ng = $self->{ng} or return '412 no news group has been selected';
604 defined $range or return '420 No article(s) selected';
606 my ($min, $max) = $ng->mm->minmax;
607 if ($range =~ /\A([0-9]+)\z/) {
609 } elsif ($range =~ /\A([0-9]+)-\z/) {
610 ($beg, $end) = ($1, $max);
611 } elsif ($range =~ /\A([0-9]+)-([0-9]+)\z/) {
612 ($beg, $end) = ($1, $2);
616 $beg = $min if ($beg < $min);
617 $end = $max if ($end > $max);
618 return '420 No article(s) selected' if ($beg > $end);
622 sub long_response ($$) {
623 my ($self, $cb) = @_;
624 die "BUG: nested long response" if $self->{long_res};
626 my $fd = fileno($self->{sock});
627 defined $fd or return;
628 # make sure we disable reading during a long response,
629 # clients should not be sending us stuff and making us do more
630 # work while we are stream a response to them
631 $self->watch_read(0);
633 $self->{long_res} = sub {
634 my $more = eval { $cb->() };
635 if ($@ || $self->{closed}) {
636 $self->{long_res} = undef;
640 "%s during long response[$fd] - %0.6f",
643 if ($self->{closed}) {
644 out($self, " deferred[$fd] aborted - %0.6f",
647 update_idle_time($self);
650 } elsif ($more) { # scalar @{$self->{wbuf}}:
651 # no recursion, schedule another call ASAP
652 # but only after all pending writes are done
653 update_idle_time($self);
656 $nextt ||= PublicInbox::EvCleanup::asap(*next_tick);
658 $self->{long_res} = undef;
661 out($self, " deferred[$fd] done - %0.6f", now() - $t0);
664 $self->{long_res}->(); # kick off!
668 sub hdr_message_id ($$$) { # optimize XHDR Message-ID [range] for slrnpull.
669 my ($self, $xhdr, $range) = @_;
671 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
672 my ($ng, $n) = mid_lookup($self, $1);
673 return r430 unless $n;
674 hdr_mid_response($self, $xhdr, $ng, $n, $range, $range);
675 } else { # numeric range
676 $range = $self->{article} unless defined $range;
677 my $r = get_range($self, $range);
678 return $r unless ref $r;
679 my $mm = $self->{ng}->mm;
680 my ($beg, $end) = @$r;
681 more($self, $xhdr ? r221 : r225);
682 long_response($self, sub {
683 my $r = $mm->msg_range(\$beg, $end);
685 more($self, join("\r\n", map {
693 sub mid_lookup ($$) {
694 my ($self, $mid) = @_;
695 my $self_ng = $self->{ng};
697 my $n = $self_ng->mm->num_for($mid);
698 return ($self_ng, $n) if defined $n;
700 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
701 next if defined $self_ng && $ng eq $self_ng;
702 my $n = $ng->mm->num_for($mid);
703 return ($ng, $n) if defined $n;
708 sub hdr_xref ($$$) { # optimize XHDR Xref [range] for rtin
709 my ($self, $xhdr, $range) = @_;
711 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
713 my ($ng, $n) = mid_lookup($self, $mid);
714 return r430 unless $n;
715 hdr_mid_response($self, $xhdr, $ng, $n, $range,
716 xref($self, $ng, $n, $mid));
717 } else { # numeric range
718 $range = $self->{article} unless defined $range;
719 my $r = get_range($self, $range);
720 return $r unless ref $r;
721 my $ng = $self->{ng};
723 my ($beg, $end) = @$r;
724 more($self, $xhdr ? r221 : r225);
725 long_response($self, sub {
726 my $r = $mm->msg_range(\$beg, $end);
728 more($self, join("\r\n", map {
730 "$num ".xref($self, $ng, $num, $_->[1]);
737 sub over_header_for {
738 my ($over, $num, $field) = @_;
739 my $smsg = $over->get_art($num) or return;
740 return PublicInbox::SearchMsg::date($smsg) if $field eq 'date';
744 sub hdr_searchmsg ($$$$) {
745 my ($self, $xhdr, $field, $range) = @_;
746 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
747 my ($ng, $n) = mid_lookup($self, $1);
748 return r430 unless defined $n;
749 my $v = over_header_for($ng->over, $n, $field);
750 hdr_mid_response($self, $xhdr, $ng, $n, $range, $v);
751 } else { # numeric range
752 $range = $self->{article} unless defined $range;
753 my $over = $self->{ng}->over;
754 my $mm = $self->{ng}->mm;
755 my $r = get_range($self, $range);
756 return $r unless ref $r;
757 my ($beg, $end) = @$r;
758 more($self, $xhdr ? r221 : r225);
760 long_response($self, sub {
761 my $msgs = $over->query_xover($cur, $end);
762 my $nr = scalar @$msgs or return;
764 foreach my $s (@$msgs) {
765 $tmp .= $s->{num} . ' ' . $s->$field . "\r\n";
768 do_more($self, $tmp);
769 $cur = $msgs->[-1]->{num} + 1;
775 my ($self, $xhdr, $header, $range) = @_;
776 my $sub = lc $header;
777 if ($sub eq 'message-id') {
778 hdr_message_id($self, $xhdr, $range);
779 } elsif ($sub eq 'xref') {
780 hdr_xref($self, $xhdr, $range);
781 } elsif ($sub =~ /\A(?:subject|references|date|from|to|cc|
783 hdr_searchmsg($self, $xhdr, $sub, $range);
784 } elsif ($sub =~ /\A:(bytes|lines)\z/) {
785 hdr_searchmsg($self, $xhdr, $1, $range);
787 $xhdr ? (r221 . "\r\n.") : "503 HDR not permitted on $header";
793 my ($self, $header, $range) = @_;
794 do_hdr($self, 0, $header, $range);
798 sub cmd_xhdr ($$;$) {
799 my ($self, $header, $range) = @_;
800 do_hdr($self, 1, $header, $range);
803 sub hdr_mid_prefix ($$$$$) {
804 my ($self, $xhdr, $ng, $n, $mid) = @_;
805 return $mid if $xhdr;
807 # HDR for RFC 3977 users
808 if (my $self_ng = $self->{ng}) {
809 ($self_ng eq $ng) ? $n : '0';
815 sub hdr_mid_response ($$$$$$) {
816 my ($self, $xhdr, $ng, $n, $mid, $v) = @_; # r: art_lookup result
819 $res .= r221 . "\r\n";
820 $res .= "$mid $v\r\n";
822 $res .= r225 . "\r\n";
823 my $pfx = hdr_mid_prefix($self, $xhdr, $ng, $n, $mid);
824 $res .= "$pfx $v\r\n";
826 res($self, $res .= '.');
830 sub cmd_xrover ($;$) {
831 my ($self, $range) = @_;
832 my $ng = $self->{ng} or return '412 no newsgroup selected';
833 (defined $range && $range =~ /[<>]/) and
834 return '420 No article(s) selected'; # no message IDs
836 $range = $self->{article} unless defined $range;
837 my $r = get_range($self, $range);
838 return $r unless ref $r;
839 my ($beg, $end) = @$r;
841 my $over = $ng->over;
842 more($self, '224 Overview information follows');
844 long_response($self, sub {
845 my $h = over_header_for($over, $beg, 'references');
846 more($self, "$beg $h") if defined($h);
851 sub over_line ($$$$) {
852 my ($self, $ng, $num, $smsg) = @_;
853 # n.b. field access and procedural calls can be
854 # 10%-15% faster than OO method calls:
855 my $s = join("\t", $num,
858 PublicInbox::SearchMsg::date($smsg),
863 "Xref: " . xref($self, $ng, $num, $smsg->{mid}));
869 my ($self, $range) = @_;
870 if ($range && $range =~ /\A<(.+)>\z/) {
871 my ($ng, $n) = mid_lookup($self, $1);
872 defined $n or return r430;
873 my $smsg = $ng->over->get_art($n) or return r430;
874 more($self, '224 Overview information follows (multi-line)');
876 # Only set article number column if it's the current group
877 my $self_ng = $self->{ng};
878 $n = 0 if (!$self_ng || $self_ng ne $ng);
879 more($self, over_line($self, $ng, $n, $smsg));
882 cmd_xover($self, $range);
886 sub cmd_xover ($;$) {
887 my ($self, $range) = @_;
888 $range = $self->{article} unless defined $range;
889 my $r = get_range($self, $range);
890 return $r unless ref $r;
891 my ($beg, $end) = @$r;
892 more($self, "224 Overview information follows for $beg to $end");
893 my $over = $self->{ng}->over;
895 long_response($self, sub {
896 my $msgs = $over->query_xover($cur, $end);
897 my $nr = scalar @$msgs or return;
900 more($self, join("\r\n", map {
901 over_line($self, $self->{ng}, $_->{num}, $_);
903 $cur = $msgs->[-1]->{num} + 1;
908 my ($self, $mid) = @_;
909 return r501 unless $mid =~ /\A<(.+)>\z/;
912 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
913 my $n = $ng->mm->num_for($mid);
914 push @paths, "$ng->{newsgroup}/$n" if defined $n;
916 return '430 no such article on server' unless @paths;
917 '223 '.join(' ', @paths);
921 my ($self, $line) = @_;
922 do_write($self, $line . "\r\n");
926 my ($self, $line) = @_;
927 do_more($self, $line . "\r\n");
931 my ($self, $data) = @_;
932 my $done = $self->write($data);
933 return 0 if $self->{closed};
935 # Do not watch for readability if we have data in the queue,
936 # instead re-enable watching for readability when we can
937 $self->watch_read(0) if (!$done || $self->{long_res});
943 my ($self, $fmt, @args) = @_;
944 printf { $self->{nntpd}->{err} } $fmt."\n", @args;
948 my ($self, $fmt, @args) = @_;
949 printf { $self->{nntpd}->{out} } $fmt."\n", @args;
952 use constant MSG_MORE => ($^O eq 'linux') ? 0x8000 : 0;
955 my ($self, $data) = @_;
956 if (MSG_MORE && !scalar(@{$self->{wbuf}})) {
957 my $n = send($self->{sock}, $data, MSG_MORE);
959 my $dlen = length($data);
960 return 1 if $n == $dlen; # all done!
961 $data = substr($data, $n, $dlen - $n);
964 do_write($self, $data);
969 return if $self->{closed};
971 my $wbuf = $self->{wbuf};
973 update_idle_time($self);
975 return if $self->{closed} || scalar(@$wbuf);
977 return if $self->{long_res};
978 # only read more requests if we've drained the write buffer,
979 # otherwise we can be buffering infinitely w/o backpressure
981 use constant LINE_MAX => 512; # RFC 977 section 2.3
982 my $rbuf = \($self->{rbuf});
985 if (index($$rbuf, "\n") < 0) {
986 my $off = length($$rbuf);
987 $r = sysread($self->{sock}, $$rbuf, LINE_MAX, $off);
988 unless (defined $r) {
989 return if $!{EAGAIN};
992 return $self->close if $r == 0;
995 while ($r > 0 && $$rbuf =~ s/\A[ \t\r\n]*([^\r\n]*)\r?\n//) {
997 return $self->close if $line =~ /[[:cntrl:]]/s;
999 my $fd = fileno($self->{sock});
1000 $r = eval { process_line($self, $line) };
1001 my $d = $self->{long_res} ?
1002 " deferred[$fd]" : '';
1003 out($self, "[$fd] %s - %0.6f$d", $line, now() - $t0);
1006 return $self->close if $r < 0;
1007 my $len = length($$rbuf);
1008 return $self->close if ($len >= LINE_MAX);
1009 update_idle_time($self);
1014 if (index($self->{rbuf}, "\n") >= 0) {
1015 # Force another read if there is a pipelined request.
1016 # We don't know if the socket has anything for us to read,
1017 # and we must double-check again by the time the timer fires
1018 # in case we really did dispatch a read event and started
1019 # another long response.
1020 push @$nextq, $self;
1021 $nextt ||= PublicInbox::EvCleanup::asap(*next_tick);
1023 # no pipelined requests available, let the kernel know
1024 # to wake us up if there's more
1025 $self->watch_read(1); # PublicInbox::DS::watch_read
1029 sub not_idle_long ($$) {
1030 my ($self, $now) = @_;
1031 my $sock = $self->{sock} or return;
1032 defined(my $fd = fileno($sock)) or return;
1033 my $ary = $EXPMAP->{$fd} or return;
1034 my $exp_at = $ary->[0] + $EXPTIME;
1038 # for graceful shutdown in PublicInbox::Daemon:
1040 my ($self, $now) = @_;
1041 ($self->{rbuf} ne '' || $self->{long_res} ||
1042 scalar(@{$self->{wbuf}}) || not_idle_long($self, $now));