# Copyright (C) 2015-2018 all contributors # License: AGPL-3.0+ # # Each instance of this represents a NNTP client socket package PublicInbox::NNTP; use strict; use warnings; use base qw(Danga::Socket); use fields qw(nntpd article rbuf ng long_res); use PublicInbox::Search; use PublicInbox::Msgmap; use PublicInbox::MID qw(mid_escape); use PublicInbox::Git; require PublicInbox::EvCleanup; use Email::Simple; use POSIX qw(strftime); use Time::HiRes qw(clock_gettime CLOCK_MONOTONIC); use Digest::SHA qw(sha1_hex); use Time::Local qw(timegm timelocal); use constant { r501 => '501 command syntax error', r221 => '221 Header follows', r224 => '224 Overview information follows (multi-line)', r225 => '225 Headers follow (multi-line)', r430 => '430 No article with that message-id', long_response_limit => 0xffffffff, }; sub now () { clock_gettime(CLOCK_MONOTONIC) }; my @OVERVIEW = qw(Subject From Date Message-ID References Xref); my $OVERVIEW_FMT = join(":\r\n", @OVERVIEW, qw(Bytes Lines)) . ":\r\n"; my $LIST_HEADERS = join("\r\n", @OVERVIEW, qw(:bytes :lines Xref To Cc)) . "\r\n"; # disable commands with easy DoS potential: my %DISABLED; # = map { $_ => 1 } qw(xover list_overview_fmt newnews xhdr); my $EXPMAP; # fd -> [ idle_time, $self ] my $expt; our $EXPTIME = 180; # 3 minutes my $nextt; my $nextq = []; sub next_tick () { $nextt = undef; my $q = $nextq; $nextq = []; foreach my $nntp (@$q) { # for request && response protocols, always finish writing # before finishing reading: if (my $long_cb = $nntp->{long_res}) { $nntp->write($long_cb); } else { # pipelined request, we bypassed socket-readiness # checks to get here: event_read($nntp); # maybe there's more pipelined data, or we'll have # to register it for socket-readiness notifications if (!$nntp->{long_res} && !$nntp->{closed}) { check_read($nntp); } } } } sub update_idle_time ($) { my ($self) = @_; my $fd = $self->{fd}; defined $fd and $EXPMAP->{$fd} = [ now(), $self ]; } sub expire_old () { my $now = now(); my $exp = $EXPTIME; my $old = $now - $exp; my $nr = 0; my %new; while (my ($fd, $v) = each %$EXPMAP) { my ($idle_time, $nntp) = @$v; if ($idle_time < $old) { $nntp->close; # idempotent } else { ++$nr; $new{$fd} = $v; } } $EXPMAP = \%new; if ($nr) { $expt = PublicInbox::EvCleanup::later(*expire_old); } else { $expt = undef; # noop to kick outselves out of the loop ASAP so descriptors # really get closed PublicInbox::EvCleanup::asap(sub {}); } } sub new ($$$) { my ($class, $sock, $nntpd) = @_; my $self = fields::new($class); $self->SUPER::new($sock); $self->{nntpd} = $nntpd; res($self, '201 ' . $nntpd->{servername} . ' ready - post via email'); $self->{rbuf} = ''; $self->watch_read(1); update_idle_time($self); $expt ||= PublicInbox::EvCleanup::later(*expire_old); $self; } sub args_ok ($$) { my ($cb, $argc) = @_; my $tot = prototype $cb; my ($nreq, undef) = split(';', $tot); $nreq = ($nreq =~ tr/$//) - 1; $tot = ($tot =~ tr/$//) - 1; ($argc <= $tot && $argc >= $nreq); } # returns 1 if we can continue, 0 if not due to buffered writes or disconnect sub process_line ($$) { my ($self, $l) = @_; my ($req, @args) = split(/\s+/, $l); return unless defined($req); $req = lc($req); $req = eval { no strict 'refs'; $req = $DISABLED{$req} ? undef : *{'cmd_'.$req}{CODE}; }; return res($self, '500 command not recognized') unless $req; return res($self, r501) unless args_ok($req, scalar @args); my $res = eval { $req->($self, @args) }; my $err = $@; if ($err && !$self->{closed}) { local $/ = "\n"; chomp($l); err($self, 'error from: %s (%s)', $l, $err); $res = '503 program fault - command not performed'; } return 0 unless defined $res; res($self, $res); } sub cmd_mode ($$) { my ($self, $arg) = @_; $arg = uc $arg; return r501 unless $arg eq 'READER'; '201 Posting prohibited'; } sub cmd_slave ($) { '202 slave status noted' } sub cmd_xgtitle ($;$) { my ($self, $wildmat) = @_; more($self, '282 list of groups and descriptions follows'); list_newsgroups($self, $wildmat); '.' } sub list_overview_fmt ($) { my ($self) = @_; do_more($self, $OVERVIEW_FMT); } sub list_headers ($;$) { my ($self) = @_; do_more($self, $LIST_HEADERS); } sub list_active ($;$) { my ($self, $wildmat) = @_; wildmat2re($wildmat); foreach my $ng (@{$self->{nntpd}->{grouplist}}) { $ng->{newsgroup} =~ $wildmat or next; group_line($self, $ng); } } sub list_active_times ($;$) { my ($self, $wildmat) = @_; wildmat2re($wildmat); foreach my $ng (@{$self->{nntpd}->{grouplist}}) { $ng->{newsgroup} =~ $wildmat or next; my $c = eval { $ng->mm->created_at } || time; more($self, "$ng->{newsgroup} $c $ng->{-primary_address}"); } } sub list_newsgroups ($;$) { my ($self, $wildmat) = @_; wildmat2re($wildmat); foreach my $ng (@{$self->{nntpd}->{grouplist}}) { $ng->{newsgroup} =~ $wildmat or next; my $d = $ng->description; more($self, "$ng->{newsgroup} $d"); } } # LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported sub cmd_list ($;$$) { my ($self, @args) = @_; if (scalar @args) { my $arg = shift @args; $arg =~ tr/A-Z./a-z_/; $arg = "list_$arg"; return r501 if $DISABLED{$arg}; $arg = eval { no strict 'refs'; *{$arg}{CODE}; }; return r501 unless $arg && args_ok($arg, scalar @args); more($self, '215 information follows'); $arg->($self, @args); } else { more($self, '215 list of newsgroups follows'); foreach my $ng (@{$self->{nntpd}->{grouplist}}) { group_line($self, $ng); } } '.' } sub cmd_listgroup ($;$) { my ($self, $group) = @_; if (defined $group) { my $res = cmd_group($self, $group); return $res if ($res !~ /\A211 /); more($self, $res); } $self->{ng} or return '412 no newsgroup selected'; my $n = 0; long_response($self, sub { my $ary = $self->{ng}->mm->ids_after(\$n); scalar @$ary or return; more($self, join("\r\n", @$ary)); 1; }); } sub parse_time ($$;$) { my ($date, $time, $gmt) = @_; my ($hh, $mm, $ss) = unpack('A2A2A2', $time); if (defined $gmt) { $gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt"; $gmt = 1; } my @now = $gmt ? gmtime : localtime; my ($YYYY, $MM, $DD); if (length($date) == 8) { # RFC 3977 allows YYYYMMDD ($YYYY, $MM, $DD) = unpack('A4A2A2', $date); } else { # legacy clients send YYMMDD ($YYYY, $MM, $DD) = unpack('A2A2A2', $date); my $cur_year = $now[5] + 1900; if ($YYYY > $cur_year) { $YYYY += int($cur_year / 1000) * 1000 - 100; } } if ($gmt) { timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY); } else { timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY); } } sub group_line ($$) { my ($self, $ng) = @_; my ($min, $max) = $ng->mm->minmax; more($self, "$ng->{newsgroup} $max $min n") if defined $min && defined $max; } sub cmd_newgroups ($$$;$$) { my ($self, $date, $time, $gmt, $dists) = @_; my $ts = eval { parse_time($date, $time, $gmt) }; return r501 if $@; # TODO dists more($self, '231 list of new newsgroups follows'); foreach my $ng (@{$self->{nntpd}->{grouplist}}) { my $c = eval { $ng->mm->created_at } || 0; next unless $c > $ts; group_line($self, $ng); } '.' } sub wildmat2re (;$) { return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*'); my %keep; my $salt = rand; my $tmp = $_[0]; $tmp =~ s#(? '.*', '?' => '.' ); $tmp =~ s#(? '.*', ',' => '|'); $_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge; $_[0] = qr/\A(?:$_[0])\z/; } sub cmd_newnews ($$$$;$$) { my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_; my $ts = eval { parse_time($date, $time, $gmt) }; return r501 if $@; more($self, '230 list of new articles by message-id follows'); my ($keep, $skip) = split('!', $newsgroups, 2); ngpat2re($keep); ngpat2re($skip); my @srch; foreach my $ng (@{$self->{nntpd}->{grouplist}}) { $ng->{newsgroup} =~ $keep or next; $ng->{newsgroup} =~ $skip and next; my $srch = $ng->search or next; push @srch, $srch; }; return '.' unless @srch; my $prev = 0; long_response($self, sub { my $srch = $srch[0]; my $msgs = $srch->query_ts($ts, $prev); if (scalar @$msgs) { more($self, '<' . join(">\r\n<", map { $_->mid } @$msgs ). '>'); $prev = $msgs->[-1]->{num}; } else { shift @srch; if (@srch) { # continue onto next newsgroup $prev = 0; return 1; } else { # break out of the long response. return; } } }); } sub cmd_group ($$) { my ($self, $group) = @_; my $no_such = '411 no such news group'; my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such; $self->{ng} = $ng; my ($min, $max) = $ng->mm->minmax; $min ||= 0; $max ||= 0; $self->{article} = $min; my $est_size = $max - $min; "211 $est_size $min $max $group"; } sub article_adj ($$) { my ($self, $off) = @_; my $ng = $self->{ng} or return '412 no newsgroup selected'; my $n = $self->{article}; defined $n or return '420 no current article has been selected'; $n += $off; my $mid = $ng->mm->mid_for($n); unless ($mid) { $n = $off > 0 ? 'next' : 'previous'; return "421 no $n article in this group"; } $self->{article} = $n; "223 $n <$mid> article retrieved - request text separately"; } sub cmd_next ($) { article_adj($_[0], 1) } sub cmd_last ($) { article_adj($_[0], -1) } # We want to encourage using email and CC-ing everybody involved to avoid # the single-point-of-failure a single server provides. sub cmd_post ($) { my ($self) = @_; my $ng = $self->{ng}; $ng ? "440 mailto:$ng->{-primary_address} to post" : '440 posting not allowed' } sub cmd_quit ($) { my ($self) = @_; res($self, '205 closing connection - goodbye!'); $self->close; undef; } sub header_append ($$$) { my ($hdr, $k, $v) = @_; my @v = $hdr->header($k); foreach (@v) { return if $v eq $_; } $hdr->header_set($k, @v, $v); } sub xref ($$$$) { my ($self, $ng, $n, $mid) = @_; my $ret = $self->{nntpd}->{servername} . " $ng->{newsgroup}:$n"; # num_for is pretty cheap and sometimes we'll lookup the existence # of an article without getting even the OVER info. In other words, # I'm not sure if its worth optimizing by scanning To:/Cc: and # PublicInbox::ExtMsg on the PSGI end is just as expensive foreach my $other (@{$self->{nntpd}->{grouplist}}) { next if $ng eq $other; my $num = eval { $other->mm->num_for($mid) } or next; $ret .= " $other->{newsgroup}:$num"; } $ret; } sub set_nntp_headers ($$$$$) { my ($self, $hdr, $ng, $n, $mid) = @_; # clobber some my $xref = xref($self, $ng, $n, $mid); $hdr->header_set('Xref', $xref); $xref =~ s/:\d+//g; $hdr->header_set('Newsgroups', (split(/ /, $xref, 2))[1]); header_append($hdr, 'List-Post', "{-primary_address}>"); if (my $url = $ng->base_url) { $mid = mid_escape($mid); header_append($hdr, 'Archived-At', "<$url$mid/>"); header_append($hdr, 'List-Archive', "<$url>"); } } sub art_lookup ($$$) { my ($self, $art, $set_headers) = @_; my $ng = $self->{ng}; my ($n, $mid); my $err; if (defined $art) { if ($art =~ /\A\d+\z/o) { $err = '423 no such article number in this group'; $n = int($art); goto find_mid; } elsif ($art =~ /\A<([^>]+)>\z/) { $mid = $1; $err = r430; $n = $ng->mm->num_for($mid) if $ng; goto found if defined $n; foreach my $g (values %{$self->{nntpd}->{groups}}) { $n = $g->mm->num_for($mid); if (defined $n) { $ng = $g; goto found; } } return $err; } else { return r501; } } else { $err = '420 no current article has been selected'; $n = $self->{article}; defined $n or return $err; find_mid: $ng or return '412 no newsgroup has been selected'; $mid = $ng->mm->mid_for($n); defined $mid or return $err; } found: my $smsg = $ng->search->{over_ro}->get_art($n) or return $err; my $msg = $ng->msg_by_smsg($smsg) or return $err; my $s = Email::Simple->new($msg); if ($set_headers) { set_nntp_headers($self, $s->header_obj, $ng, $n, $mid); # must be last $s->body_set('') if ($set_headers == 2); } [ $n, $mid, $s, $smsg->bytes, $smsg->lines, $ng ]; } sub simple_body_write ($$) { my ($self, $s) = @_; my $body = $s->body; $s->body_set(''); $body =~ s/^\./../smg; $body =~ s/(?{article} = $art if defined $art && $art =~ /\A\d+\z/; } sub _header ($) { my $hdr = $_[0]->header_obj->as_string; utf8::encode($hdr); $hdr } sub cmd_article ($;$) { my ($self, $art) = @_; my $r = art_lookup($self, $art, 1); return $r unless ref $r; my ($n, $mid, $s) = @$r; set_art($self, $art); more($self, "220 $n <$mid> article retrieved - head and body follow"); do_more($self, _header($s)); do_more($self, "\r\n"); simple_body_write($self, $s); } sub cmd_head ($;$) { my ($self, $art) = @_; my $r = art_lookup($self, $art, 2); return $r unless ref $r; my ($n, $mid, $s) = @$r; set_art($self, $art); more($self, "221 $n <$mid> article retrieved - head follows"); do_more($self, _header($s)); '.' } sub cmd_body ($;$) { my ($self, $art) = @_; my $r = art_lookup($self, $art, 0); return $r unless ref $r; my ($n, $mid, $s) = @$r; set_art($self, $art); more($self, "222 $n <$mid> article retrieved - body follows"); simple_body_write($self, $s); } sub cmd_stat ($;$) { my ($self, $art) = @_; my $r = art_lookup($self, $art, 0); return $r unless ref $r; my ($n, $mid, undef) = @$r; set_art($self, $art); "223 $n <$mid> article retrieved - request text separately"; } sub cmd_ihave ($) { '435 article not wanted - do not send it' } sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) } sub cmd_help ($) { my ($self) = @_; more($self, '100 help text follows'); '.' } sub get_range ($$) { my ($self, $range) = @_; my $ng = $self->{ng} or return '412 no news group has been selected'; defined $range or return '420 No article(s) selected'; my ($beg, $end); my ($min, $max) = $ng->mm->minmax; if ($range =~ /\A(\d+)\z/) { $beg = $end = $1; } elsif ($range =~ /\A(\d+)-\z/) { ($beg, $end) = ($1, $max); } elsif ($range =~ /\A(\d+)-(\d+)\z/) { ($beg, $end) = ($1, $2); } else { return r501; } $beg = $min if ($beg < $min); $end = $max if ($end > $max); return '420 No article(s) selected' if ($beg > $end); [ $beg, $end ]; } sub long_response ($$) { my ($self, $cb) = @_; die "BUG: nested long response" if $self->{long_res}; my $fd = $self->{fd}; defined $fd or return; # make sure we disable reading during a long response, # clients should not be sending us stuff and making us do more # work while we are stream a response to them $self->watch_read(0); my $t0 = now(); $self->{long_res} = sub { my $more = eval { $cb->() }; if ($@ || $self->{closed}) { $self->{long_res} = undef; if ($@) { err($self, "%s during long response[$fd] - %0.6f", $@, now() - $t0); } if ($self->{closed}) { out($self, " deferred[$fd] aborted - %0.6f", now() - $t0); } else { update_idle_time($self); check_read($self); } } elsif ($more) { # $self->{write_buf_size}: # no recursion, schedule another call ASAP # but only after all pending writes are done update_idle_time($self); push @$nextq, $self; $nextt ||= PublicInbox::EvCleanup::asap(*next_tick); } else { # all done! $self->{long_res} = undef; check_read($self); res($self, '.'); out($self, " deferred[$fd] done - %0.6f", now() - $t0); } }; $self->{long_res}->(); # kick off! undef; } sub hdr_message_id ($$$) { # optimize XHDR Message-ID [range] for slrnpull. my ($self, $xhdr, $range) = @_; if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID my ($ng, $n) = mid_lookup($self, $1); return r430 unless $n; hdr_mid_response($self, $xhdr, $ng, $n, $range, $range); } else { # numeric range $range = $self->{article} unless defined $range; my $r = get_range($self, $range); return $r unless ref $r; my $mm = $self->{ng}->mm; my ($beg, $end) = @$r; more($self, $xhdr ? r221 : r225); long_response($self, sub { my $r = $mm->msg_range(\$beg, $end); @$r or return; more($self, join("\r\n", map { "$_->[0] <$_->[1]>" } @$r)); 1; }); } } sub mid_lookup ($$) { my ($self, $mid) = @_; my $self_ng = $self->{ng}; if ($self_ng) { my $n = $self_ng->mm->num_for($mid); return ($self_ng, $n) if defined $n; } foreach my $ng (values %{$self->{nntpd}->{groups}}) { next if defined $self_ng && $ng eq $self_ng; my $n = $ng->mm->num_for($mid); return ($ng, $n) if defined $n; } (undef, undef); } sub hdr_xref ($$$) { # optimize XHDR Xref [range] for rtin my ($self, $xhdr, $range) = @_; if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID my $mid = $1; my ($ng, $n) = mid_lookup($self, $mid); return r430 unless $n; hdr_mid_response($self, $xhdr, $ng, $n, $range, xref($self, $ng, $n, $mid)); } else { # numeric range $range = $self->{article} unless defined $range; my $r = get_range($self, $range); return $r unless ref $r; my $ng = $self->{ng}; my $mm = $ng->mm; my ($beg, $end) = @$r; more($self, $xhdr ? r221 : r225); long_response($self, sub { my $r = $mm->msg_range(\$beg, $end); @$r or return; more($self, join("\r\n", map { my $num = $_->[0]; "$num ".xref($self, $ng, $num, $_->[1]); } @$r)); 1; }); } } sub search_header_for { my ($srch, $num, $field) = @_; my $smsg = $srch->{over_ro}->get_art($num) or return; return PublicInbox::SearchMsg::date($smsg) if $field eq 'date'; $smsg->{$field}; } sub hdr_searchmsg ($$$$) { my ($self, $xhdr, $field, $range) = @_; if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID my ($ng, $n) = mid_lookup($self, $1); return r430 unless defined $n; my $v = search_header_for($ng->search, $n, $field); hdr_mid_response($self, $xhdr, $ng, $n, $range, $v); } else { # numeric range $range = $self->{article} unless defined $range; my $srch = $self->{ng}->search; my $mm = $self->{ng}->mm; my $r = get_range($self, $range); return $r unless ref $r; my ($beg, $end) = @$r; more($self, $xhdr ? r221 : r225); my $cur = $beg; long_response($self, sub { my $msgs = $srch->query_xover($cur, $end); my $nr = scalar @$msgs or return; my $tmp = ''; foreach my $s (@$msgs) { $tmp .= $s->{num} . ' ' . $s->$field . "\r\n"; } utf8::encode($tmp); do_more($self, $tmp); $cur = $msgs->[-1]->{num} + 1; }); } } sub do_hdr ($$$;$) { my ($self, $xhdr, $header, $range) = @_; my $sub = lc $header; if ($sub eq 'message-id') { hdr_message_id($self, $xhdr, $range); } elsif ($sub eq 'xref') { hdr_xref($self, $xhdr, $range); } elsif ($sub =~ /\A(?:subject|references|date|from|to|cc| bytes|lines)\z/x) { hdr_searchmsg($self, $xhdr, $sub, $range); } elsif ($sub =~ /\A:(bytes|lines)\z/) { hdr_searchmsg($self, $xhdr, $1, $range); } else { $xhdr ? (r221 . "\r\n.") : "503 HDR not permitted on $header"; } } # RFC 3977 sub cmd_hdr ($$;$) { my ($self, $header, $range) = @_; do_hdr($self, 0, $header, $range); } # RFC 2980 sub cmd_xhdr ($$;$) { my ($self, $header, $range) = @_; do_hdr($self, 1, $header, $range); } sub hdr_mid_prefix ($$$$$) { my ($self, $xhdr, $ng, $n, $mid) = @_; return $mid if $xhdr; # HDR for RFC 3977 users if (my $self_ng = $self->{ng}) { ($self_ng eq $ng) ? $n : '0'; } else { '0'; } } sub hdr_mid_response ($$$$$$) { my ($self, $xhdr, $ng, $n, $mid, $v) = @_; # r: art_lookup result my $res = ''; if ($xhdr) { $res .= r221 . "\r\n"; $res .= "$mid $v\r\n"; } else { $res .= r225 . "\r\n"; my $pfx = hdr_mid_prefix($self, $xhdr, $ng, $n, $mid); $res .= "$pfx $v\r\n"; } res($self, $res .= '.'); undef; } sub cmd_xrover ($;$) { my ($self, $range) = @_; my $ng = $self->{ng} or return '412 no newsgroup selected'; (defined $range && $range =~ /[<>]/) and return '420 No article(s) selected'; # no message IDs $range = $self->{article} unless defined $range; my $r = get_range($self, $range); return $r unless ref $r; my ($beg, $end) = @$r; my $mm = $ng->mm; my $srch = $ng->search; more($self, '224 Overview information follows'); long_response($self, sub { my $h = search_header_for($srch, $beg, 'references'); more($self, "$beg $h") if defined($h); $beg++ < $end; }); } sub over_line ($$$$) { my ($self, $ng, $num, $smsg) = @_; # n.b. field access and procedural calls can be # 10%-15% faster than OO method calls: my $s = join("\t", $num, $smsg->{subject}, $smsg->{from}, PublicInbox::SearchMsg::date($smsg), "<$smsg->{mid}>", $smsg->{references}, $smsg->{bytes}, $smsg->{lines}, "Xref: " . xref($self, $ng, $num, $smsg->{mid})); utf8::encode($s); $s } sub cmd_over ($;$) { my ($self, $range) = @_; if ($range && $range =~ /\A<(.+)>\z/) { my ($ng, $n) = mid_lookup($self, $1); defined $n or return r430; my $smsg = $ng->search->{over_ro}->get_art($n) or return r430; more($self, '224 Overview information follows (multi-line)'); # Only set article number column if it's the current group my $self_ng = $self->{ng}; $n = 0 if (!$self_ng || $self_ng ne $ng); more($self, over_line($self, $ng, $n, $smsg)); '.'; } else { cmd_xover($self, $range); } } sub cmd_xover ($;$) { my ($self, $range) = @_; $range = $self->{article} unless defined $range; my $r = get_range($self, $range); return $r unless ref $r; my ($beg, $end) = @$r; more($self, "224 Overview information follows for $beg to $end"); my $srch = $self->{ng}->search; my $cur = $beg; long_response($self, sub { my $msgs = $srch->query_xover($cur, $end); my $nr = scalar @$msgs or return; # OVERVIEW.FMT more($self, join("\r\n", map { over_line($self, $self->{ng}, $_->{num}, $_); } @$msgs)); $cur = $msgs->[-1]->{num} + 1; }); } sub cmd_xpath ($$) { my ($self, $mid) = @_; return r501 unless $mid =~ /\A<(.+)>\z/; $mid = $1; my @paths; foreach my $ng (values %{$self->{nntpd}->{groups}}) { my $n = $ng->mm->num_for($mid); push @paths, "$ng->{newsgroup}/$n" if defined $n; } return '430 no such article on server' unless @paths; '223 '.join(' ', @paths); } sub res ($$) { my ($self, $line) = @_; do_write($self, $line . "\r\n"); } sub more ($$) { my ($self, $line) = @_; do_more($self, $line . "\r\n"); } sub do_write ($$) { my ($self, $data) = @_; my $done = $self->write($data); return if $self->{closed}; # Do not watch for readability if we have data in the queue, # instead re-enable watching for readability when we can $self->watch_read(0) if (!$done || $self->{long_res}); $done; } sub err ($$;@) { my ($self, $fmt, @args) = @_; printf { $self->{nntpd}->{err} } $fmt."\n", @args; } sub out ($$;@) { my ($self, $fmt, @args) = @_; printf { $self->{nntpd}->{out} } $fmt."\n", @args; } use constant MSG_MORE => ($^O eq 'linux') ? 0x8000 : 0; sub do_more ($$) { my ($self, $data) = @_; if (MSG_MORE && !$self->{write_buf_size}) { my $n = send($self->{sock}, $data, MSG_MORE); if (defined $n) { my $dlen = length($data); return 1 if $n == $dlen; # all done! $data = substr($data, $n, $dlen - $n); } } do_write($self, $data); } # callbacks for Danga::Socket sub event_hup { $_[0]->close } sub event_err { $_[0]->close } sub event_write { my ($self) = @_; update_idle_time($self); # only continue watching for readability when we are done writing: if ($self->write(undef) == 1 && !$self->{long_res}) { $self->watch_read(1); } } sub event_read { my ($self) = @_; use constant LINE_MAX => 512; # RFC 977 section 2.3 if (index($self->{rbuf}, "\n") < 0) { my $buf = $self->read(LINE_MAX) or return $self->close; $self->{rbuf} .= $$buf; } my $r = 1; while ($r > 0 && $self->{rbuf} =~ s/\A\s*([^\r\n]*)\r?\n//) { my $line = $1; return $self->close if $line =~ /[[:cntrl:]]/s; my $t0 = now(); my $fd = $self->{fd}; $r = eval { process_line($self, $line) }; my $d = $self->{long_res} ? " deferred[$fd]" : ''; out($self, "[$fd] %s - %0.6f$d", $line, now() - $t0); } return $self->close if $r < 0; my $len = length($self->{rbuf}); return $self->close if ($len >= LINE_MAX); update_idle_time($self); } sub check_read { my ($self) = @_; if (index($self->{rbuf}, "\n") >= 0) { # Force another read if there is a pipelined request. # We don't know if the socket has anything for us to read, # and we must double-check again by the time the timer fires # in case we really did dispatch a read event and started # another long response. push @$nextq, $self; $nextt ||= PublicInbox::EvCleanup::asap(*next_tick); } else { # no pipelined requests available, let the kernel know # to wake us up if there's more $self->watch_read(1); # Danga::Socket::watch_read } } sub not_idle_long ($$) { my ($self, $now) = @_; defined(my $fd = $self->{fd}) or return; my $ary = $EXPMAP->{$fd} or return; my $exp_at = $ary->[0] + $EXPTIME; $exp_at > $now; } # for graceful shutdown in PublicInbox::Daemon: sub busy { my ($self, $now) = @_; ($self->{rbuf} ne '' || $self->{long_res} || $self->{write_buf_size} || not_idle_long($self, $now)); } 1;