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>
3 # contains common daemon code for the nntpd and httpd servers.
4 # This may be used for read-only IMAP server if we decide to implement it.
5 package PublicInbox::Daemon;
8 use Getopt::Long qw/:config gnu_getopt no_ignore_case auto_abbrev/;
14 use PublicInbox::DS qw(now);
15 require PublicInbox::EvCleanup;
17 require PublicInbox::Listener;
18 require PublicInbox::ParentPipe;
21 my (@cfg_listen, $stdout, $stderr, $group, $user, $pid_file, $daemonize);
22 my $worker_processes = 1;
25 my %listener_names; # sockname => IO::Handle
26 my %tls_opt; # scheme://sockname => args for IO::Socket::SSL->start_SSL
30 my ($default_cert, $default_key);
31 END { $cleanup->() if $cleanup };
32 my %KNOWN_TLS = ( 443 => 'https', 563 => 'nntps' );
33 my %KNOWN_STARTTLS = ( 119 => 'nntp' );
35 sub accept_tls_opt ($) {
37 # opt_str: opt1=val1,opt2=val2 (opt may repeat for multi-value)
38 require PublicInbox::TLS;
40 # allow ',' as delimiter since '&' is shell-unfriendly
41 foreach (split(/[,&]/, $opt_str)) {
42 my ($k, $v) = split(/=/, $_, 2);
43 push @{$o->{$k} ||= []}, $v;
46 # key may be a part of cert. At least
47 # p5-io-socket-ssl/example/ssl_server.pl has this fallback:
48 $o->{cert} //= [ $default_cert ];
49 $o->{key} //= defined($default_key) ? [ $default_key ] : $o->{cert};
50 my %ctx_opt = (SSL_server => 1);
51 # parse out hostname:/path/to/ mappings:
52 foreach my $k (qw(cert key)) {
53 my $x = $ctx_opt{'SSL_'.$k.'_file'} = {};
54 foreach my $path (@{$o->{$k}}) {
56 $path =~ s/\A([^:]+):// and $host = $1;
60 my $ctx = IO::Socket::SSL::SSL_Context->new(%ctx_opt) or
61 die 'SSL_Context->new: '.PublicInbox::TLS::err();
62 { SSL_server => 1, SSL_startHandshake => 0, SSL_reuse_ctx => $ctx };
65 sub daemon_prepare ($) {
66 my ($default_listen) = @_;
68 $SIG{HUP} = $SIG{USR1} = $SIG{USR2} = $SIG{PIPE} =
69 $SIG{TTIN} = $SIG{TTOU} = $SIG{WINCH} = 'IGNORE';
71 'l|listen=s' => \@cfg_listen,
72 '1|stdout=s' => \$stdout,
73 '2|stderr=s' => \$stderr,
74 'W|worker-processes=i' => \$worker_processes,
75 'P|pid-file=s' => \$pid_file,
77 'g|group=s' => \$group,
78 'D|daemonize' => \$daemonize,
79 'cert=s' => \$default_cert,
80 'key=s' => \$default_key,
82 GetOptions(%opts) or die "bad command-line args\n";
84 if (defined $pid_file && $pid_file =~ /\.oldbin\z/) {
85 die "--pid-file cannot end with '.oldbin'\n";
87 @listeners = inherit();
89 # allow socket-activation users to set certs once and not
90 # have to configure each socket:
91 my @inherited_names = keys(%listener_names) if defined($default_cert);
93 # ignore daemonize when inheriting
94 $daemonize = undef if scalar @listeners;
96 push @cfg_listen, $default_listen unless (@listeners || @cfg_listen);
98 foreach my $l (@cfg_listen) {
101 if ($l =~ s!\A([^:]+)://!!) {
103 } elsif ($l =~ /\A(?:\[[^\]]+\]|[^:]+):([0-9])+/) {
104 my $s = $KNOWN_TLS{$1} // $KNOWN_STARTTLS{$1};
105 $scheme = $s if defined $s;
107 if ($l =~ s!/?\?(.+)\z!!) {
108 $tls_opt{"$scheme://$l"} = accept_tls_opt($1);
109 } elsif (defined($default_cert)) {
110 $tls_opt{"$scheme://$l"} = accept_tls_opt('');
111 } elsif ($scheme =~ /\A(?:nntps|https)\z/) {
112 die "$orig specified w/o cert=\n";
114 # TODO: use scheme to load either NNTP.pm or HTTP.pm
116 next if $listener_names{$l}; # already inherited
118 if (index($l, '/') == 0) {
119 $sock_pkg = 'IO::Socket::UNIX';
120 eval "use $sock_pkg";
122 %o = (Type => SOCK_STREAM, Peer => $l);
124 my $c = $sock_pkg->new(%o);
125 if (!defined($c) && $!{ECONNREFUSED}) {
127 "failed to unlink stale socket=$l: $!\n";
128 } # else: let the bind fail
130 $o{Local} = delete $o{Peer};
132 # both work for IPv4, too
133 for (qw(IO::Socket::IP IO::Socket::INET6)) {
135 eval "use $sock_pkg";
139 %o = (LocalAddr => $l, ReuseAddr => 1, Proto => 'tcp');
142 my $prev = umask 0000;
143 my $s = eval { $sock_pkg->new(%o) };
144 warn "error binding $l: $! ($@)\n" unless $s;
148 $listener_names{sockname($s)} = $s;
153 # cert/key options in @cfg_listen takes precedence when inheriting,
154 # but map well-known inherited ports if --listen isn't specified
156 for my $sockname (@inherited_names) {
157 $sockname =~ /:([0-9]+)\z/ or next;
158 if (my $scheme = $KNOWN_TLS{$1}) {
159 $tls_opt{"$scheme://$sockname"} ||= accept_tls_opt('');
160 } elsif (($scheme = $KNOWN_STARTTLS{$1})) {
161 next if $tls_opt{"$scheme://$sockname"};
162 $tls_opt{''} ||= accept_tls_opt('');
166 die "No listeners bound\n" unless @listeners;
169 sub check_absolute ($$) {
170 my ($var, $val) = @_;
171 if (defined $val && index($val, '/') != 0) {
173 "--$var must be an absolute path when using --daemonize: $val\n";
179 foreach my $i (0..$#ARGV) {
182 $ARGV[$i] = abs_path($arg);
184 check_absolute('stdout', $stdout);
185 check_absolute('stderr', $stderr);
186 check_absolute('pid-file', $pid_file);
188 chdir '/' or die "chdir failed: $!";
191 return unless (defined $pid_file || defined $group || defined $user
194 eval { require Net::Server::Daemonize };
197 "Net::Server required for --pid-file, --group, --user, and --daemonize\n$@\n";
200 Net::Server::Daemonize::check_pid_file($pid_file) if defined $pid_file;
201 $uid = Net::Server::Daemonize::get_uid($user) if defined $user;
202 if (defined $group) {
203 $gid = Net::Server::Daemonize::get_gid($group);
204 $gid = (split /\s+/, $gid)[0];
205 } elsif (defined $uid) {
206 $gid = (getpwuid($uid))[3];
209 # We change users in the worker to ensure upgradability,
210 # The upgrade will create the ".oldbin" pid file in the
211 # same directory as the given pid file.
212 $uid and $set_user = sub {
214 Net::Server::Daemonize::set_user($uid, $gid);
219 die "could not fork: $!\n" unless defined $pid;
222 open(STDIN, '+<', '/dev/null') or
223 die "redirect stdin failed: $!\n";
224 open STDOUT, '>&STDIN' or die "redirect stdout failed: $!\n";
225 open STDERR, '>&STDIN' or die "redirect stderr failed: $!\n";
228 die "could not fork: $!\n" unless defined $pid;
231 if (defined $pid_file) {
232 write_pid($pid_file);
235 $cleanup = undef; # avoid cyclic reference
236 unlink_pid_file_safe_ish($unlink_pid, $pid_file);
244 # killing again terminates immediately:
245 exit unless @listeners;
247 $_->close foreach @listeners; # call PublicInbox::DS::close
249 $reason->close if ref($reason) eq 'PublicInbox::ParentPipe';
253 # drop idle connections and try to quit gracefully
254 PublicInbox::DS->SetPostLoopCallback(sub {
255 my ($dmap, undef) = @_;
259 foreach my $s (values %$dmap) {
260 $s->can('busy') or next;
261 if ($s->busy($now)) {
264 # close as much as possible, early as possible
269 if (($warn + 5) < now()) {
270 warn "$$ quitting, $n client(s) left\n";
273 unless (defined $proc_name) {
274 $proc_name = (split(/\s+/, $0))[0];
275 $proc_name =~ s!\A.*?([^/]+)\z!$1!;
277 $0 = "$proc_name quitting, $n client(s) left";
279 $n; # true: loop continues, false: loop breaks
285 open STDOUT, '>>', $stdout or
286 warn "failed to redirect stdout to $stdout: $!\n";
287 STDOUT->autoflush(1);
291 open STDERR, '>>', $stderr or
292 warn "failed to redirect stderr to $stderr: $!\n";
293 STDERR->autoflush(1);
300 my $addr = getsockname($s) or return;
301 my ($host, $port) = host_with_port($addr);
302 if ($port == 0 && $host eq '127.0.0.1') {
303 my ($path) = Socket::sockaddr_un($addr);
309 sub unpack_ipv6 ($) {
313 # Socket.pm in Perl 5.14+ supports IPv6:
315 ($port, $host) = Socket::unpack_sockaddr_in6($addr);
316 $host = Socket::inet_ntop(Socket::AF_INET6(), $host);
320 # Perl 5.12 or earlier? SpamAssassin and Net::Server use
321 # Socket6, so it may be installed on our system, already
322 # (otherwise die here):
325 ($port, $host) = Socket6::unpack_sockaddr_in6($addr);
326 $host = Socket6::inet_ntop(Socket6::AF_INET6(), $host);
331 sub host_with_port ($) {
335 # this eval will die on Unix sockets:
337 if (length($addr) >= 28) {
338 ($host, $port) = unpack_ipv6($addr);
341 ($port, $host) = Socket::sockaddr_in($addr);
342 $host = Socket::inet_ntoa($host);
345 $@ ? ('127.0.0.1', 0) : ($host, $port);
349 return () if ($ENV{LISTEN_PID} || 0) != $$;
350 my $fds = $ENV{LISTEN_FDS} or return ();
351 my $end = $fds + 2; # LISTEN_FDS_START - 1
353 foreach my $fd (3..$end) {
354 my $s = IO::Handle->new_from_fd($fd, 'r');
355 if (my $k = sockname($s)) {
356 $listener_names{$k} = $s;
359 warn "failed to inherit fd=$fd (LISTEN_FDS=$fds)";
367 warn "upgrade in-progress: $reexec_pid\n";
370 if (defined $pid_file) {
371 if ($pid_file =~ /\.oldbin\z/) {
372 warn "BUG: .oldbin suffix exists: $pid_file\n";
375 unlink_pid_file_safe_ish($$, $pid_file);
376 $pid_file .= '.oldbin';
377 write_pid($pid_file);
380 unless (defined $pid) {
381 warn "fork failed: $!\n";
385 use Fcntl qw(FD_CLOEXEC F_SETFD F_GETFD);
386 $ENV{LISTEN_FDS} = scalar @listeners;
387 $ENV{LISTEN_PID} = $$;
388 foreach my $s (@listeners) {
389 my $fl = fcntl($s, F_GETFD, 0);
390 fcntl($s, F_SETFD, $fl &= ~FD_CLOEXEC);
393 die "Failed to exec: $!\n";
398 sub kill_workers ($) {
401 while (my ($pid, $id) = each %pids) {
406 sub upgrade_aborted ($) {
408 warn "reexec PID($p) died with: $?\n";
410 return unless $pid_file;
412 my $file = $pid_file;
413 $file =~ s/\.oldbin\z// or die "BUG: no '.oldbin' suffix in $file";
414 unlink_pid_file_safe_ish($$, $pid_file);
416 eval { write_pid($pid_file) };
420 sub reap_children () {
422 my $p = waitpid(-1, &POSIX::WNOHANG) or return;
423 if (defined $reexec_pid && $p == $reexec_pid) {
425 } elsif (defined(my $id = delete $pids{$p})) {
426 warn "worker[$id] PID($p) died with: $?\n";
428 warn "unknown PID($p) reaped: $?\n";
435 sub unlink_pid_file_safe_ish ($$) {
436 my ($unlink_pid, $file) = @_;
437 return unless defined $unlink_pid && $unlink_pid == $$;
439 open my $fh, '<', $file or return;
441 defined(my $read_pid = <$fh>) or return;
443 if ($read_pid == $unlink_pid) {
444 Net::Server::Daemonize::unlink_pid_file($file);
449 pipe(my ($p0, $p1)) or die "failed to create parent-pipe: $!";
450 pipe(my ($r, $w)) or die "failed to create self-pipe: $!";
452 if ($^O eq 'linux') { # 1031: F_SETPIPE_SZ = 1031
453 fcntl($_, 1031, 4096) for ($w, $p1);
456 IO::Handle::blocking($w, 0);
457 my $set_workers = $worker_processes;
460 foreach my $s (qw(HUP CHLD QUIT INT TERM USR1 USR2 TTIN TTOU WINCH)) {
462 return if $$ != $master_pid;
471 while (my $s = shift @caught) {
475 } elsif ($s eq 'USR2') {
477 } elsif ($s =~ /\A(?:QUIT|TERM|INT)\z/) {
480 } elsif ($s eq 'WINCH') {
481 if (-t STDIN || -t STDOUT || -t STDERR) {
483 "ignoring SIGWINCH since we are not daemonized\n";
484 $SIG{WINCH} = 'IGNORE';
486 $worker_processes = 0;
488 } elsif ($s eq 'HUP') {
489 $worker_processes = $set_workers;
491 } elsif ($s eq 'TTIN') {
492 if ($set_workers > $worker_processes) {
495 $worker_processes = ++$set_workers;
497 } elsif ($s eq 'TTOU') {
498 if ($set_workers > 0) {
499 $worker_processes = --$set_workers;
501 } elsif ($s eq 'CHLD') {
506 my $n = scalar keys %pids;
509 $set_workers = $worker_processes = $n = 0;
512 if ($n > $worker_processes) {
513 while (my ($k, $v) = each %pids) {
514 kill('TERM', $k) if $v >= $worker_processes;
516 $n = $worker_processes;
518 foreach my $i ($n..($worker_processes - 1)) {
521 warn "failed to fork worker[$i]: $!\n";
522 } elsif ($pid == 0) {
523 $set_user->() if $set_user;
524 return $p0; # run normal work code
526 warn "PID=$pid is worker[$i]\n";
530 # just wait on signal events here:
531 sysread($r, my $buf, 8);
533 exit # never gets here, just for documentation
536 sub tls_start_cb ($$) {
537 my ($opt, $orig_post_accept) = @_;
539 my ($io, $addr, $srv) = @_;
540 my $ssl = IO::Socket::SSL->start_SSL($io, %$opt);
541 $orig_post_accept->($ssl, $addr, $srv);
545 sub daemon_loop ($$$) {
546 my ($refresh, $post_accept, $nntpd) = @_;
547 PublicInbox::EvCleanup::enable(); # early for $refresh
549 while (my ($k, $v) = each %tls_opt) {
550 if ($k =~ s!\A(?:nntps|https)://!!) {
551 $post_accept{$k} = tls_start_cb($v, $post_accept);
552 } elsif ($nntpd) { # STARTTLS, $k eq '' is OK
553 $nntpd->{accept_tls} = $v;
557 if ($worker_processes > 0) {
558 $refresh->(); # preload by default
559 my $fh = master_loop(); # returns if in child process
560 $parent_pipe = PublicInbox::ParentPipe->new($fh, *worker_quit);
563 $set_user->() if $set_user;
564 $SIG{USR2} = sub { worker_quit('USR2') if upgrade() };
569 $SIG{QUIT} = $SIG{INT} = $SIG{TERM} = *worker_quit;
570 $SIG{USR1} = *reopen_logs;
571 $SIG{HUP} = $refresh;
572 $SIG{CHLD} = 'DEFAULT';
573 $SIG{$_} = 'IGNORE' for qw(USR2 TTIN TTOU WINCH);
574 # this calls epoll_create:
576 PublicInbox::Listener->new($_,
577 $post_accept{sockname($_)} || $post_accept)
579 PublicInbox::DS->EventLoop;
580 $parent_pipe = undef;
585 my ($default, $refresh, $post_accept, $nntpd) = @_;
586 daemon_prepare($default);
588 daemon_loop($refresh, $post_accept, $nntpd);
593 if (defined $uid and !chown($uid, $gid, $path)) {
594 warn "could not chown $path: $!\n";
600 Net::Server::Daemonize::create_pid_file($path);