# Copyright (C) 2015-2020 all contributors
# License: AGPL-3.0+
#
# Each instance of this represents a NNTP client socket
# fields:
# nntpd: PublicInbox::NNTPD ref
# article: per-session current article number
# ng: PublicInbox::Inbox ref
# long_cb: long_response private data
package PublicInbox::NNTP;
use strict;
use parent qw(PublicInbox::DS);
use PublicInbox::MID qw(mid_escape $MID_EXTRACT);
use PublicInbox::Eml;
use POSIX qw(strftime);
use PublicInbox::DS qw(now);
use Digest::SHA qw(sha1_hex);
use Time::Local qw(timegm timelocal);
use PublicInbox::GitAsyncCat;
use constant {
LINE_MAX => 512, # RFC 977 section 2.3
r501 => '501 command syntax error',
r502 => '502 Command unavailable',
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',
};
use PublicInbox::Syscall qw(EPOLLIN EPOLLONESHOT);
use Errno qw(EAGAIN);
my $ONE_MSGID = qr/\A$MID_EXTRACT\z/;
my @OVERVIEW = qw(Subject From Date Message-ID References);
my $OVERVIEW_FMT = join(":\r\n", @OVERVIEW, qw(Bytes Lines), '') .
"Xref:full\r\n";
my $LIST_HEADERS = join("\r\n", @OVERVIEW,
qw(:bytes :lines Xref To Cc)) . "\r\n";
my $CAPABILITIES = <<"";
101 Capability list:\r
VERSION 2\r
READER\r
NEWNEWS\r
LIST ACTIVE ACTIVE.TIMES NEWSGROUPS OVERVIEW.FMT\r
HDR\r
OVER\r
COMPRESS DEFLATE\r
sub greet ($) { $_[0]->write($_[0]->{nntpd}->{greet}) };
sub new ($$$) {
my ($class, $sock, $nntpd) = @_;
my $self = bless { nntpd => $nntpd }, $class;
my $ev = EPOLLIN;
my $wbuf;
if ($sock->can('accept_SSL') && !$sock->accept_SSL) {
return CORE::close($sock) if $! != EAGAIN;
$ev = PublicInbox::TLS::epollbit();
$wbuf = [ \&PublicInbox::DS::accept_tls_step, \&greet ];
}
$self->SUPER::new($sock, $ev | EPOLLONESHOT);
if ($wbuf) {
$self->{wbuf} = $wbuf;
} else {
greet($self);
}
$self->update_idle_time;
$self;
}
sub args_ok ($$) {
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 ($$) {
my ($self, $l) = @_;
my ($req, @args) = split(/[ \t]+/, $l);
return 1 unless defined($req); # skip blank line
$req = $self->can('cmd_'.lc($req));
return res($self, '500 command not recognized') unless $req;
return res($self, r501) unless args_ok($req, scalar @args);
my $res = eval { $req->($self, @args) };
my $err = $@;
if ($err && $self->{sock}) {
local $/ = "\n";
chomp($l);
err($self, 'error from: %s (%s)', $l, $err);
$res = '503 program fault - command not performed';
}
return 0 unless defined $res;
res($self, $res);
}
# The keyword argument is not used (rfc3977 5.2.2)
sub cmd_capabilities ($;$) {
my ($self, undef) = @_;
my $res = $CAPABILITIES;
if (!$self->{sock}->can('accept_SSL') &&
$self->{nntpd}->{accept_tls}) {
$res .= "STARTTLS\r\n";
}
$res .= '.';
}
sub cmd_mode ($$) {
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) = @_;
$self->msg_more($OVERVIEW_FMT);
}
sub list_headers ($;$) {
my ($self) = @_;
$self->msg_more($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} $d");
}
}
# LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported
sub cmd_list ($;$$) {
my ($self, @args) = @_;
if (scalar @args) {
my $arg = shift @args;
$arg =~ tr/A-Z./a-z_/;
$arg = "list_$arg";
$arg = $self->can($arg);
return r501 unless $arg && args_ok($arg, scalar @args);
more($self, '215 information follows');
$arg->($self, @args);
} else {
more($self, '215 list of newsgroups follows');
foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
group_line($self, $ng);
}
}
'.'
}
sub listgroup_range_i {
my ($self, $beg, $end) = @_;
my $r = $self->{ng}->mm->msg_range($beg, $end, 'num');
scalar(@$r) or return;
more($self, join("\r\n", map { $_->[0] } @$r));
1;
}
sub listgroup_all_i {
my ($self, $num) = @_;
my $ary = $self->{ng}->mm->ids_after($num);
scalar(@$ary) or return;
more($self, join("\r\n", @$ary));
1;
}
sub cmd_listgroup ($;$$) {
my ($self, $group, $range) = @_;
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';
if (defined $range) {
my $r = get_range($self, $range);
return $r unless ref $r;
long_response($self, \&listgroup_range_i, @$r);
} else { # grab every article number
long_response($self, \&listgroup_all_i, \(my $num = 0));
}
}
sub parse_time ($$;$) {
my ($date, $time, $gmt) = @_;
my ($hh, $mm, $ss) = unpack('A2A2A2', $time);
if (defined $gmt) {
$gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt";
$gmt = 1;
}
my ($YYYY, $MM, $DD);
if (bytes::length($date) == 8) { # RFC 3977 allows YYYYMMDD
($YYYY, $MM, $DD) = unpack('A4A2A2', $date);
} else { # legacy clients send YYMMDD
my $YY;
($YY, $MM, $DD) = unpack('A2A2A2', $date);
my @now = $gmt ? gmtime : localtime;
my $cur_year = $now[5] + 1900;
my $cur_cent = int($cur_year / 100) * 100;
$YYYY = (($YY + $cur_cent) > $cur_year) ?
($YY + 1900) : ($YY + $cur_cent);
}
if ($gmt) {
timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
} else {
timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
}
}
sub group_line ($$) {
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 newnews_i {
my ($self, $overs, $ts, $prev) = @_;
my $over = $overs->[0];
my $msgs = $over->query_ts($ts, $$prev);
if (scalar @$msgs) {
more($self, '<' .
join(">\r\n<", map { $_->{mid} } @$msgs ).
'>');
$$prev = $msgs->[-1]->{num};
} else {
shift @$overs;
if (@$overs) { # continue onto next newsgroup
$$prev = 0;
return 1;
} else { # break out of the long response.
return;
}
}
}
sub cmd_newnews ($$$$;$$) {
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 @overs;
foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
$ng->{newsgroup} =~ $keep or next;
$ng->{newsgroup} =~ $skip and next;
my $over = $ng->over or next;
push @overs, $over;
};
return '.' unless @overs;
my $prev = 0;
long_response($self, \&newnews_i, \@overs, $ts, \$prev);
}
sub cmd_group ($$) {
my ($self, $group) = @_;
my $no_such = '411 no such news group';
my $nntpd = $self->{nntpd};
my $ng = $nntpd->{groups}->{$group} or return $no_such;
$nntpd->idler_start;
$self->{ng} = $ng;
my ($min, $max) = $ng->mm->minmax;
$min ||= 0;
$max ||= 0;
$self->{article} = $min;
my $est_size = $max - $min;
"211 $est_size $min $max $group";
}
sub article_adj ($$) {
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->shutdn;
undef;
}
sub header_append ($$$) {
my ($hdr, $k, $v) = @_;
my @v = $hdr->header_raw($k);
foreach (@v) {
return if $v eq $_;
}
$hdr->header_set($k, @v, $v);
}
sub xref ($$$$) {
my ($self, $ng, $n, $mid) = @_;
my $ret = $self->{nntpd}->{servername} . " $ng->{newsgroup}:$n";
# num_for is pretty cheap and sometimes we'll lookup the existence
# of an article without getting even the OVER info. In other words,
# I'm not sure if its worth optimizing by scanning To:/Cc: and
# PublicInbox::ExtMsg on the PSGI end is just as expensive
foreach my $other (@{$self->{nntpd}->{grouplist}}) {
next if $ng eq $other;
my $num = eval { $other->mm->num_for($mid) } or next;
$ret .= " $other->{newsgroup}:$num";
}
$ret;
}
sub set_nntp_headers ($$$) {
my ($self, $hdr, $smsg) = @_;
my ($mid) = $smsg->{mid};
# why? leafnode requires a Path: header for some inexplicable
# reason. We'll fake the shortest one possible.
$hdr->header_set('Path', 'y');
# leafnode (and maybe other NNTP clients) have trouble dealing
# with v2 messages which have multiple Message-IDs (either due
# to our own content-based dedupe or buggy git-send-email versions).
my @mids = $hdr->header_raw('Message-ID');
if (scalar(@mids) > 1) {
my $mid0 = "<$mid>";
$hdr->header_set('Message-ID', $mid0);
my @alt = $hdr->header_raw('X-Alt-Message-ID');
my %seen = map { $_ => 1 } (@alt, $mid0);
push(@alt, grep { !$seen{$_}++ } @mids);
$hdr->header_set('X-Alt-Message-ID', @alt);
}
# clobber some
my $ng = $self->{ng};
my $xref = xref($self, $ng, $smsg->{num}, $mid);
$hdr->header_set('Xref', $xref);
$xref =~ s/:[0-9]+//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 ($$) {
my ($self, $art) = @_;
my $ng = $self->{ng};
my ($n, $mid);
my $err;
if (defined $art) {
if ($art =~ /\A[0-9]+\z/) {
$err = '423 no such article number in this group';
$n = int($art);
goto find_mid;
} elsif ($art =~ $ONE_MSGID) {
$mid = $1;
$err = r430;
$n = $ng->mm->num_for($mid) if $ng;
goto found if defined $n;
foreach my $g (values %{$self->{nntpd}->{groups}}) {
$n = $g->mm->num_for($mid);
if (defined $n) {
$ng = $g;
goto found;
}
}
return $err;
} else {
return r501;
}
} else {
$err = '420 no current article has been selected';
$n = $self->{article};
defined $n or return $err;
find_mid:
$ng or return '412 no newsgroup has been selected';
$mid = $ng->mm->mid_for($n);
defined $mid or return $err;
}
found:
my $smsg = $ng->over->get_art($n) or return $err;
$smsg;
}
sub msg_body_write ($$) {
my ($self, $msg) = @_;
# these can momentarily double the memory consumption :<
$$msg =~ s/^\./../smg;
$$msg =~ s/(?msg_more($$msg);
}
sub set_art {
my ($self, $art) = @_;
$self->{article} = $art if defined $art && $art =~ /\A[0-9]+\z/;
}
sub msg_hdr_write ($$$) {
my ($self, $eml, $smsg) = @_;
set_nntp_headers($self, $eml, $smsg);
my $hdr = $eml->{hdr} // \(my $x = '');
# fixup old bug from import (pre-a0c07cba0e5d8b6a)
$$hdr =~ s/\A[\r\n]*From [^\r\n]*\r?\n//s;
$$hdr =~ s/(?msg_more($$hdr);
}
sub blob_cb { # called by git->cat_async via git_async_cat
my ($bref, $oid, $type, $size, $smsg) = @_;
my $self = $smsg->{nntp};
my $code = $smsg->{nntp_code} // 220;
if (!defined($oid)) {
# it's possible to have TOCTOU if an admin runs
# public-inbox-(edit|purge), just move onto the next message
warn "E: $smsg->{blob} missing in $self->{ng}->{inboxdir}\n";
return $self->requeue;
} elsif ($smsg->{blob} ne $oid) {
$self->close;
die "BUG: $smsg->{blob} != $oid";
}
my $r = "$code $smsg->{num} <$smsg->{mid}> article retrieved - ";
my $eml = PublicInbox::Eml->new($bref);
if ($code == 220) {
more($self, $r .= 'head and body follow');
msg_hdr_write($self, $eml, $smsg);
$self->msg_more("\r\n");
msg_body_write($self, $bref);
} elsif ($code == 221) {
more($self, $r .= 'head follows');
msg_hdr_write($self, $eml, $smsg);
} elsif ($code == 222) {
more($self, $r .= 'body follows');
msg_body_write($self, $bref);
} else {
$self->close;
die "BUG: bad code: $r";
}
$self->write(\".\r\n"); # flushes (includes ->zflush)
$self->requeue;
}
sub cmd_article ($;$) {
my ($self, $art) = @_;
my $smsg = art_lookup($self, $art);
return $smsg unless ref $smsg;
set_art($self, $art);
$smsg->{nntp} = $self;
${git_async_cat($self->{ng}->git, $smsg->{blob}, \&blob_cb, $smsg)};
}
sub cmd_head ($;$) {
my ($self, $art) = @_;
my $smsg = art_lookup($self, $art);
return $smsg unless ref $smsg;
set_art($self, $art);
$smsg->{nntp} = $self;
$smsg->{nntp_code} = 221;
${git_async_cat($self->{ng}->git, $smsg->{blob}, \&blob_cb, $smsg)};
}
sub cmd_body ($;$) {
my ($self, $art) = @_;
my $smsg = art_lookup($self, $art);
return $smsg unless ref $smsg;
set_art($self, $art);
$smsg->{nntp} = $self;
$smsg->{nntp_code} = 222;
${git_async_cat($self->{ng}->git, $smsg->{blob}, \&blob_cb, $smsg)};
}
sub cmd_stat ($;$) {
my ($self, $art) = @_;
my $smsg = art_lookup($self, $art); # art may be msgid
return $smsg unless ref $smsg;
$art = $smsg->{num};
set_art($self, $art);
"223 $art <$smsg->{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([0-9]+)\z/) {
$beg = $end = $1;
} elsif ($range =~ /\A([0-9]+)-\z/) {
($beg, $end) = ($1, $max);
} elsif ($range =~ /\A([0-9]+)-([0-9]+)\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, $end ];
}
sub long_step {
my ($self) = @_;
# wbuf is unset or empty, here; {long} may add to it
my ($fd, $cb, $t0, @args) = @{$self->{long_cb}};
my $more = eval { $cb->($self, @args) };
if ($@ || !$self->{sock}) { # something bad happened...
delete $self->{long_cb};
my $elapsed = now() - $t0;
if ($@) {
err($self,
"%s during long response[$fd] - %0.6f",
$@, $elapsed);
}
out($self, " deferred[$fd] aborted - %0.6f", $elapsed);
$self->close;
} elsif ($more) { # $self->{wbuf}:
$self->update_idle_time;
# COMPRESS users all share the same DEFLATE context.
# Flush it here to ensure clients don't see
# each other's data
$self->zflush;
# no recursion, schedule another call ASAP, but only after
# all pending writes are done. autovivify wbuf:
my $new_size = push(@{$self->{wbuf}}, \&long_step);
# wbuf may be populated by $cb, no need to rearm if so:
$self->requeue if $new_size == 1;
} else { # all done!
delete $self->{long_cb};
res($self, '.');
my $elapsed = now() - $t0;
my $fd = fileno($self->{sock});
out($self, " deferred[$fd] done - %0.6f", $elapsed);
my $wbuf = $self->{wbuf}; # do NOT autovivify
$self->requeue unless $wbuf && @$wbuf;
}
}
sub long_response ($$;@) {
my ($self, $cb, @args) = @_; # cb returns true if more, false if done
my $sock = $self->{sock} or return;
# make sure we disable reading during a long response,
# clients should not be sending us stuff and making us do more
# work while we are stream a response to them
$self->{long_cb} = [ fileno($sock), $cb, now(), @args ];
long_step($self); # kick off!
undef;
}
sub hdr_msgid_range_i {
my ($self, $beg, $end) = @_;
my $r = $self->{ng}->mm->msg_range($beg, $end);
@$r or return;
more($self, join("\r\n", map { "$_->[0] <$_->[1]>" } @$r));
1;
}
sub hdr_message_id ($$$) { # optimize XHDR Message-ID [range] for slrnpull.
my ($self, $xhdr, $range) = @_;
if (defined $range && $range =~ $ONE_MSGID) {
my ($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 $r;
more($self, $xhdr ? r221 : r225);
long_response($self, \&hdr_msgid_range_i, @$r);
}
}
sub mid_lookup ($$) {
my ($self, $mid) = @_;
my $self_ng = $self->{ng};
if ($self_ng) {
my $n = $self_ng->mm->num_for($mid);
return ($self_ng, $n) if defined $n;
}
foreach my $ng (values %{$self->{nntpd}->{groups}}) {
next if defined $self_ng && $ng eq $self_ng;
my $n = $ng->mm->num_for($mid);
return ($ng, $n) if defined $n;
}
(undef, undef);
}
sub xref_range_i {
my ($self, $beg, $end) = @_;
my $ng = $self->{ng};
my $r = $ng->mm->msg_range($beg, $end);
@$r or return;
more($self, join("\r\n", map {
my $num = $_->[0];
"$num ".xref($self, $ng, $num, $_->[1]);
} @$r));
1;
}
sub hdr_xref ($$$) { # optimize XHDR Xref [range] for rtin
my ($self, $xhdr, $range) = @_;
if (defined $range && $range =~ $ONE_MSGID) {
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 $r;
more($self, $xhdr ? r221 : r225);
long_response($self, \&xref_range_i, @$r);
}
}
sub over_header_for {
my ($over, $num, $field) = @_;
my $smsg = $over->get_art($num) or return;
return PublicInbox::Smsg::date($smsg) if $field eq 'date';
$smsg->{$field};
}
sub smsg_range_i {
my ($self, $beg, $end, $field) = @_;
my $over = $self->{ng}->over;
my $msgs = $over->query_xover($$beg, $end);
scalar(@$msgs) or return;
my $tmp = '';
# ->{$field} is faster than ->$field invocations, so favor that.
if ($field eq 'date') {
for my $s (@$msgs) {
$tmp .= "$s->{num} ".PublicInbox::Smsg::date($s)."\r\n"
}
} else {
for my $s (@$msgs) {
$tmp .= "$s->{num} $s->{$field}\r\n";
}
}
utf8::encode($tmp);
$self->msg_more($tmp);
$$beg = $msgs->[-1]->{num} + 1;
}
sub hdr_smsg ($$$$) {
my ($self, $xhdr, $field, $range) = @_;
if (defined $range && $range =~ $ONE_MSGID) {
my ($ng, $n) = mid_lookup($self, $1);
return r430 unless defined $n;
my $v = over_header_for($ng->over, $n, $field);
hdr_mid_response($self, $xhdr, $ng, $n, $range, $v);
} else { # numeric range
$range = $self->{article} unless defined $range;
my $r = get_range($self, $range);
return $r unless ref $r;
more($self, $xhdr ? r221 : r225);
long_response($self, \&smsg_range_i, @$r, $field);
}
}
sub do_hdr ($$$;$) {
my ($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_smsg($self, $xhdr, $sub, $range);
} elsif ($sub =~ /\A:(bytes|lines)\z/) {
hdr_smsg($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 ($$$$$) {
my ($self, $xhdr, $ng, $n, $mid) = @_;
return $mid if $xhdr;
# HDR for RFC 3977 users
if (my $self_ng = $self->{ng}) {
($self_ng eq $ng) ? $n : '0';
} else {
'0';
}
}
sub hdr_mid_response ($$$$$$) {
my ($self, $xhdr, $ng, $n, $mid, $v) = @_;
my $res = '';
if ($xhdr) {
$res .= r221 . "\r\n";
$res .= "$mid $v\r\n";
} else {
$res .= r225 . "\r\n";
my $pfx = hdr_mid_prefix($self, $xhdr, $ng, $n, $mid);
$res .= "$pfx $v\r\n";
}
res($self, $res .= '.');
undef;
}
sub xrover_i {
my ($self, $beg, $end) = @_;
my $h = over_header_for($self->{ng}->over, $$beg, 'references');
more($self, "$$beg $h") if defined($h);
$$beg++ < $end;
}
sub cmd_xrover ($;$) {
my ($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 $r;
more($self, '224 Overview information follows');
long_response($self, \&xrover_i, @$r);
}
sub over_line ($$$$) {
my ($self, $ng, $num, $smsg) = @_;
# n.b. field access and procedural calls can be
# 10%-15% faster than OO method calls:
my $s = join("\t", $num,
$smsg->{subject},
$smsg->{from},
PublicInbox::Smsg::date($smsg),
"<$smsg->{mid}>",
$smsg->{references},
$smsg->{bytes},
$smsg->{lines},
"Xref: " . xref($self, $ng, $num, $smsg->{mid}));
utf8::encode($s);
$s
}
sub cmd_over ($;$) {
my ($self, $range) = @_;
if ($range && $range =~ $ONE_MSGID) {
my ($ng, $n) = mid_lookup($self, $1);
defined $n or return r430;
my $smsg = $ng->over->get_art($n) or return r430;
more($self, '224 Overview information follows (multi-line)');
# Only set article number column if it's the current group
my $self_ng = $self->{ng};
$n = 0 if (!$self_ng || $self_ng ne $ng);
more($self, over_line($self, $ng, $n, $smsg));
'.';
} else {
cmd_xover($self, $range);
}
}
sub xover_i {
my ($self, $beg, $end) = @_;
my $ng = $self->{ng};
my $msgs = $ng->over->query_xover($$beg, $end);
my $nr = scalar @$msgs or return;
# OVERVIEW.FMT
more($self, join("\r\n", map {
over_line($self, $ng, $_->{num}, $_);
} @$msgs));
$$beg = $msgs->[-1]->{num} + 1;
}
sub cmd_xover ($;$) {
my ($self, $range) = @_;
$range = $self->{article} unless defined $range;
my $r = get_range($self, $range);
return $r unless ref $r;
my ($beg, $end) = @$r;
more($self, "224 Overview information follows for $$beg to $end");
long_response($self, \&xover_i, @$r);
}
sub compressed { undef }
sub cmd_starttls ($) {
my ($self) = @_;
my $sock = $self->{sock} or return;
# RFC 4642 2.2.1
return r502 if ($sock->can('accept_SSL') || $self->compressed);
my $opt = $self->{nntpd}->{accept_tls} or
return '580 can not initiate TLS negotiation';
res($self, '382 Continue with TLS negotiation');
$self->{sock} = IO::Socket::SSL->start_SSL($sock, %$opt);
$self->requeue if PublicInbox::DS::accept_tls_step($self);
undef;
}
# RFC 8054
sub cmd_compress ($$) {
my ($self, $alg) = @_;
return '503 Only DEFLATE is supported' if uc($alg) ne 'DEFLATE';
return r502 if $self->compressed;
PublicInbox::NNTPdeflate->enable($self);
$self->requeue;
undef
}
sub zflush {} # overridden by NNTPdeflate
sub cmd_xpath ($$) {
my ($self, $mid) = @_;
return r501 unless $mid =~ $ONE_MSGID;
$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 ($$) { do_write($_[0], $_[1] . "\r\n") }
sub more ($$) { $_[0]->msg_more($_[1] . "\r\n") }
sub do_write ($$) {
my $self = $_[0];
my $done = $self->write(\($_[1]));
return 0 unless $self->{sock};
$done;
}
sub err ($$;@) {
my ($self, $fmt, @args) = @_;
printf { $self->{nntpd}->{err} } $fmt."\n", @args;
}
sub out ($$;@) {
my ($self, $fmt, @args) = @_;
printf { $self->{nntpd}->{out} } $fmt."\n", @args;
}
# callback used by PublicInbox::DS for any (e)poll (in/out/hup/err)
sub event_step {
my ($self) = @_;
return unless $self->flush_write && $self->{sock} && !$self->{long_cb};
$self->update_idle_time;
# only read more requests if we've drained the write buffer,
# otherwise we can be buffering infinitely w/o backpressure
my $rbuf = $self->{rbuf} // \(my $x = '');
my $line = index($$rbuf, "\n");
while ($line < 0) {
return $self->close if length($$rbuf) >= LINE_MAX;
$self->do_read($rbuf, LINE_MAX, length($$rbuf)) or return;
$line = index($$rbuf, "\n");
}
$line = substr($$rbuf, 0, $line + 1, '');
$line =~ s/\r?\n\z//s;
return $self->close if $line =~ /[[:cntrl:]]/s;
my $t0 = now();
my $fd = fileno($self->{sock});
my $r = eval { process_line($self, $line) };
my $pending = $self->{wbuf} ? ' pending' : '';
out($self, "[$fd] %s - %0.6f$pending", $line, now() - $t0);
return $self->close if $r < 0;
$self->rbuf_idle($rbuf);
$self->update_idle_time;
# maybe there's more pipelined data, or we'll have
# to register it for socket-readiness notifications
$self->requeue unless $pending;
}
# for graceful shutdown in PublicInbox::Daemon:
sub busy {
my ($self, $now) = @_;
($self->{rbuf} || $self->{wbuf} || $self->not_idle_long($now));
}
1;