/usr/lib/obs/server/BSServer.pm is in obs-server 2.7.4-2.
This file is owned by root:root, with mode 0o644.
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# Copyright (c) 2006, 2007 Michael Schroeder, Novell Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program (see the file COPYING); if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#
################################################################
#
# Simple HTTP Server implementation, worker based. Each request
# generates a new process, requests can be dispatched over a
# dispatch table.
#
# global variables:
# *MS - master socket
# *CLNT - client socket
# *LCK - lock for exclusive access to *MS
package BSServer;
use Data::Dumper;
use Socket;
use POSIX;
use Fcntl qw(:DEFAULT :flock);
BEGIN { Fcntl->import(':seek') unless defined &SEEK_SET; }
use Symbol;
use BSHTTP;
use BSUtil;
use strict;
my $MS2; # secondary server port
our $request; # FIXME: should not be global
our $slot; # put in request?
sub deamonize {
my (@args) = @_;
if (@args && $args[0] eq '-f') {
my $pid = xfork();
exit(0) if $pid;
}
POSIX::setsid();
$SIG{'PIPE'} = 'IGNORE';
$| = 1; # flush all output immediately
}
sub serveropen {
# creates MS (=master socket) socket
# 512 connections in the queue maximum
# $port:
# reference - port is assigned by system and is returned using this reference
# string starting with & - named socket according to the string (&STDOUT, &1)
# other string - tcp socket on $port (assumes it is a number)
# $user, $group:
# if defined, try to set appropriate UID, EUID, GID, EGID ( $<, $>, $(, $) )
my ($port, $user, $group) = @_;
# check if $user and $group exist on this system
my $tcpproto = getprotobyname('tcp');
my @ports;
if (ref($port)) {
@ports = ( $port );
} else {
@ports = split(',', $port, 2);
}
my $s = \*MS;
for $port (@ports) {
if (!ref($port) && $port =~ /^&/) {
open($s, "<$port") || die("socket open: $!\n");
} else {
socket($s , PF_INET, SOCK_STREAM, $tcpproto) || die "socket: $!\n";
setsockopt($s, SOL_SOCKET, SO_REUSEADDR, pack("l",1));
if (ref($port)) {
bind($s, sockaddr_in(0, INADDR_ANY)) || die "bind: $!\n";
($$port) = sockaddr_in(getsockname($s));
} else {
bind($s, sockaddr_in($port, INADDR_ANY)) || die "bind: $!\n";
}
}
listen($s , 512) || die "listen: $!\n";
$s = \*MS2 if @ports > 1;
$MS2 = \*MS2 if @ports > 1;
}
BSUtil::drop_privs_to($user, $group);
}
sub serveropen_unix {
# creates MS (=master socket) socket
# 512 connections in the queue maximum
# creates named socket according to $filename
# race-condition safe (locks)
# $user, $group:
# if defined, try to set appropriate UID, EUID, GID, EGID ( $<, $>, $(, $) )
my ($filename, $user, $group) = @_;
BSUtil::drop_privs_to($user, $group);
# we need a lock for exclusive socket access
mkdir_p($1) if $filename =~ /^(.*)\//;
open(LCK, '>', "$filename.lock") || die("$filename.lock: $!\n");
flock(LCK, LOCK_EX | LOCK_NB) || die("$filename: already in use\n");
socket(MS, PF_UNIX, SOCK_STREAM, 0) || die("socket: $!\n");
unlink($filename);
bind(MS, sockaddr_un($filename)) || die("bind: $!\n");
listen(MS , 512) || die "listen: $!\n";
}
sub getserverlock {
return *LCK;
}
sub getserversocket {
return *MS;
}
sub getserversocket2 {
return $MS2;
}
sub setserversocket {
if (defined($_[0])) {
(*MS) = @_;
} else {
undef *MS;
}
}
sub serverclose {
close MS;
close $MS2 if $MS2;
undef $MS2;
}
sub getsocket {
return *CLNT;
}
sub setsocket {
# with argument - set current client socket
# without argument - close it
my $req = $BSServer::request || {};
$req->{'peer'} = 'unknown';
delete $req->{'peerport'};
if (defined($_[0])) {
(*CLNT) = @_;
} else {
undef *CLNT;
return;
}
eval {
my $peername = getpeername(CLNT);
if ($peername) {
my ($peerport, $peera);
($peerport, $peera) = sockaddr_in($peername);
$req->{'peerport'} = $peerport;
$req->{'peer'} = inet_ntoa($peera);
}
}
}
sub setstatus {
my ($state, $data) = @_;
my $slot = $BSServer::slot;
return unless defined $slot;
# +10 to skip time, pid, group, and extra
return unless defined(sysseek(STA, $slot * 256 + 10, Fcntl::SEEK_SET));
$data = pack("nZ244", $state, $data);
syswrite(STA, $data, length($data));
}
sub serverstatus {
my @res;
return @res unless defined $BSServer::slot;
return @res unless defined(sysseek(STA, 0, Fcntl::SEEK_SET));
my $sta;
my $slot = 0;
while ((sysread(STA, $sta, 256) || 0) == 256) {
my ($ti, $pid, $group, $extra, $state, $data) = unpack("NNCCnZ244", $sta);
push @res, { 'slot' => $slot, 'starttime' => $ti, 'pid' => $pid, 'state' => $state, 'data' => $data };
$res[-1]->{'group'} = $group if $group;
$slot++;
}
return @res;
}
sub server {
my ($conf) = @_;
$conf ||= {};
my $maxchild = $conf->{'maxchild'};
my $maxchild2 = $conf->{'maxchild2'};
my $timeout = $conf->{'timeout'};
my %chld;
my %chld2;
my $peeraddr;
my $group = 0;
my $periodic_next = 0;
my @idle;
my $idle_next = 0;
if ($conf->{'serverstatus'}) {
open(STA, '>', $conf->{'serverstatus'});
}
while (1) {
my $tout = $timeout || 5;
if ($conf->{'periodic'}) {
my $due = $periodic_next - time();
if ($due <= 0) {
$conf->{'periodic'}->($conf);
my $periodic_interval = $conf->{'periodic_interval'} || 3;
$periodic_next += $periodic_interval - $due;
$due = $periodic_interval;
}
$tout = $due if $tout > $due;
}
# listen on MS until there is an incoming connection
my $rin = '';
if ($MS2) {
vec($rin, fileno(MS), 1) = 1 if !defined($maxchild) || keys(%chld) < $maxchild;
vec($rin, fileno($MS2), 1) = 1 if !defined($maxchild2) || keys(%chld2) < $maxchild;
} else {
vec($rin, fileno(MS), 1) = 1;
}
my $r = select($rin, undef, undef, $tout);
if (!defined($r) || $r == -1) {
next if $! == POSIX::EINTR;
die("select: $!\n");
}
# now we know there is a connection on MS waiting to be accepted
my $pid;
if ($r) {
my $chldp = \%chld;
if ($MS2 && !vec($rin, fileno(MS), 1)) {
$chldp = \%chld2;
$peeraddr = accept(CLNT, $MS2);
$group = 1;
} else {
$peeraddr = accept(CLNT, MS);
$group = 0;
}
next unless $peeraddr;
my $slot = @idle ? shift(@idle) : $idle_next++;
$pid = fork();
if (defined($pid)) {
if ($pid == 0) {
# child
$BSServer::slot = $slot if $conf->{'serverstatus'};
last;
}
$chldp->{$pid} = $slot;
}
close CLNT;
}
# if there are already $maxchild connected, make blocking waitpid
# otherwise make non-blocking waitpid
while (1) {
my $hang = 0;
$hang = POSIX::WNOHANG if !defined($maxchild) || keys(%chld) < $maxchild;
$hang = POSIX::WNOHANG if $MS2 && (!defined($maxchild2) || keys(%chld) < $maxchild2);
$pid = waitpid(-1, $hang);
last unless $pid > 0;
my $slot = delete $chld{$pid};
$slot = delete $chld2{$pid} unless defined $slot;
if (defined($slot)) {
if ($conf->{'serverstatus'} && defined(sysseek(STA, $slot * 256, Fcntl::SEEK_SET))) {
syswrite(STA, "\0" x 256, 256);
}
if ($slot == $idle_next - 1) {
$idle_next--;
} else {
push @idle, $slot;
}
}
}
# timeout was set in the $conf and select timeouted on this value. There was no new connection -> exit.
return undef if !$r && defined $timeout;
}
# from now on, this is only the child process
close MS;
if ($MS2) {
close $MS2;
undef $MS2;
}
if ($conf->{'serverstatus'}) {
close(STA);
if (open(STA, '+<', $conf->{'serverstatus'})) {
fcntl(STA, F_SETFD, FD_CLOEXEC);
if (defined(sysseek(STA, $BSServer::slot * 256, Fcntl::SEEK_SET))) {
syswrite(STA, pack("NNCCnZ244", time(), $$, $group, 0, 1, 'forked'), 256);
}
} else {
undef $BSServer::slot;
}
}
my $req = {
'peer' => 'unknown',
'conf' => $conf,
};
$BSServer::request = $req;
eval {
my ($peerport, $peera) = sockaddr_in($peeraddr);
$req->{'peerport'} = $peerport;
$req->{'peer'} = inet_ntoa($peera);
};
setsockopt(CLNT, SOL_SOCKET, SO_KEEPALIVE, pack("l",1)) if $conf->{'setkeepalive'};
if ($conf->{'accept'}) {
eval {
$conf->{'accept'}->($conf, $req);
};
reply_error($conf, $@) if $@;
}
if ($conf->{'dispatch'}) {
eval {
do {
local $SIG{'ALRM'} = sub {POSIX::_exit(0);};
alarm(60); # should be enough to read the request
readrequest($req);
alarm(0);
};
my @r = $conf->{'dispatch'}->($conf, $req);
if (!$req->{'replying'}) {
if ($conf->{'stdreply'}) {
$conf->{'stdreply'}->(@r);
} else {
reply(@r);
}
}
};
reply_error($conf, $@) if $@;
close CLNT;
exit(0);
}
$SIG{'__DIE__'} = sub { die(@_) if $^S; reply_error($conf, $_[0]); };
return $req;
}
sub msg {
my $peer = ($BSServer::request || {})->{'peer'};
if (defined($peer)) {
print BSUtil::isotime().": $peer: $_[0]\n";
} else {
print BSUtil::isotime().": $_[0]\n";
}
}
# write reply to CLNT
# $str: reply string
# @hdrs: http header lines, 1st line can contain status
sub reply {
my ($str, @hdrs) = @_;
my $req = $BSServer::request || {};
if (@hdrs && $hdrs[0] =~ /^status: (\d+.*)/i) {
my $msg = $1;
$msg =~ s/:/ /g;
$hdrs[0] = "HTTP/1.1 $msg";
} else {
unshift @hdrs, "HTTP/1.1 200 OK";
}
push @hdrs, "Cache-Control: no-cache";
push @hdrs, "Connection: close";
push @hdrs, "Content-Length: ".length($str) if defined($str);
my $data = join("\r\n", @hdrs)."\r\n\r\n";
$data .= $str if defined $str;
# if ($replying && $replying == 2) {
# # Already replying. As we're in chunked mode, we can attach
# # the error as chunk header.
# $hdrs[0] =~ s/^.*? /Status: /;
# $data = "0\r\n$hdrs[0]\r\n\r\n";
# }
# discard the body so that the client gets our answer instead
# of a sigpipe.
if (exists($req->{'__data'}) && !$req->{'__eof'} && !$req->{'need_continue'}) {
eval { discard_body() };
}
# work around linux tcp implementation problem, the read side
# must be empty otherwise a tcp-reset is done when we close
# the socket, leading to data loss
fcntl(CLNT, F_SETFL,O_NONBLOCK);
my $dummy = '';
1 while sysread(CLNT, $dummy, 1024, 0);
fcntl(CLNT, F_SETFL,0);
my $l;
while (length($data)) {
$l = syswrite(CLNT, $data, length($data));
die("write error: $!\n") unless $l;
$req->{'replying'} = 1;
$data = substr($data, $l);
}
}
# "parse" error string into code and tag
sub parse_error_string {
my ($conf, $err) = @_;
$err ||= "unspecified error";
$err =~ s/\n$//s;
my $code = 400;
my $tag = '';
if ($err =~ /^(\d+)\s+([^\r\n]*)/) {
$code = $1;
$tag = $2;
} elsif ($err =~ /^([^\r\n]+)/) {
$tag = $1;
$code = 500 if $tag =~ /Too many open files/;
$code = 500 if $tag =~ /No space left on device/;
$code = 500 if $tag =~ /Not enough space/;
$code = 500 if $tag =~ /Resource temporarily unavailable/;
} else {
$tag = 'Error';
}
my @hdrs;
push @hdrs, "WWW-Authenticate: $conf->{'wwwauthenticate'}" if $code == 401 && $conf && $conf->{'wwwauthenticate'};
return ($err, $code, $tag, @hdrs);
}
sub reply_error {
my ($conf, $errstr) = @_;
my ($err, $code, $tag, @hdrs) = parse_error_string($conf, $errstr);
# send reply through custom function or standard reply
if ($conf && $conf->{'errorreply'}) {
$conf->{'errorreply'}->($err, $code, $tag, @hdrs);
} else {
reply("$err\n", "Status: $code $tag", 'Content-Type: text/plain', @hdrs);
}
close CLNT;
my $peer = ($BSServer::request || {})->{'peer'};
die("$peer: $err\n");
}
sub done {
close CLNT;
exit(0);
}
sub getpeerdata {
my $peername = getpeername(CLNT);
return (undef, undef) unless $peername;
my ($port, $addr) = sockaddr_in($peername);
$addr = inet_ntoa($addr) if $addr;
return ($port, $addr);
}
sub readrequest {
my ($req) = @_;
my $qu = '';
my $request;
# read first query line
while (1) {
if ($qu =~ /^(.*?)\r?\n/s) {
$request = $1;
last;
}
die($qu eq '' ? "empty query\n" : "received truncated query\n") if !sysread(CLNT, $qu, 1024, length($qu));
}
my ($act, $path, $vers, undef) = split(' ', $request, 4);
my %headers;
die("400 No method name\n") if !$act;
if ($vers) {
die("501 Bad method: $act\n") if $act ne 'GET' && $act ne 'HEAD' && $act ne 'POST' && $act ne 'PUT' && $act ne 'DELETE';
# read in all headers
while ($qu !~ /^(.*?)\r?\n\r?\n(.*)$/s) {
die("501 received truncated query\n") if !sysread(CLNT, $qu, 1024, length($qu));
}
$qu =~ /^(.*?)\r?\n\r?\n(.*)$/s; # redo regexp to work around perl bug
$qu = $2;
BSHTTP::gethead(\%headers, "Request: $1"); # put 1st line of http request into $headers{'request'}
} else {
# no version -> HTTP 0.9 request
die("501 Bad method, must be GET\n") if $act ne 'GET';
$qu = '';
}
my $query_string = '';
if ($path =~ /^(.*?)\?(.*)$/) {
$path = $1;
$query_string = $2;
}
$path =~ s/%([a-fA-F0-9]{2})/chr(hex($1))/ge; # unescape path
die("501 invalid path\n") unless $path =~ /^\//s; # forbid relative paths
$req->{'action'} = $act;
$req->{'path'} = $path;
$req->{'query'} = $query_string;
$req->{'headers'} = \%headers;
if ($act eq 'POST' || $act eq 'PUT') {
# send HTTP 1.1's 100-continue answer if requested by the client
if ($headers{'expect'}) {
die("417 unknown expect\n") unless lc($headers{'expect'}) eq '100-continue';
$req->{'need_continue'} = 1;
}
my $transfer_encoding = lc($headers{'transfer-encoding'} || '');
if ($act eq 'POST' && $headers{'content-type'} && lc($headers{'content-type'}) eq 'application/x-www-form-urlencoded') {
die("cannot do x-www-form-urlencoded with chunks\n") if $transfer_encoding eq 'chunked';
# form-urlencoded, read body and append to query string
send_continue() if $req->{'need_continue'};
my $cl = $headers{'content-length'} || 0;
while (length($qu) < $cl) {
sysread(CLNT, $qu, $cl - length($qu), length($qu)) || die("400 Truncated body\n");
}
$query_string .= '&' if $cl && $query_string ne '';
$query_string .= substr($qu, 0, $cl);
$req->{'query'} = $query_string;
} elsif (defined($headers{'content-length'}) || $transfer_encoding eq 'chunked') {
$req->{'__data'} = $qu;
}
}
}
sub swrite {
BSHTTP::swrite(\*CLNT, @_);
}
sub header {
my $req = $BSServer::request || {};
return ($req->{'headers'} || {})->{lc($_[0])};
}
sub have_content {
my $req = $BSServer::request || {};
return exists($req->{'__data'}) ? 1 : 0;
}
sub get_content_type {
die("get_content_type: no content attached\n") unless have_content();
return header('content-type');
}
###########################################################################
sub send_continue {
my $req = $BSServer::request;
return unless delete $req->{'need_continue'};
my $data = "HTTP/1.1 100 continue\r\n\r\n";
while (length($data)) {
my $l = syswrite(CLNT, $data, length($data));
die("write error: $!\n") unless $l;
$data = substr($data, $l);
}
}
sub discard_body {
my $req = $BSServer::request;
return unless exists($req->{'__data'}) && !$req->{'__eof'};
1 while read_data(8192) ne '';
}
###########################################################################
sub read_file {
my ($filename, @args) = @_;
die("read_file: no content attached\n") unless have_content();
my $req = $BSServer::request;
send_continue() if $req->{'need_continue'};
$req->{'__socket'} = \*CLNT;
my $res = BSHTTP::file_receiver($req, {'filename' => $filename, @args});
delete $req->{'__socket'};
return $res;
}
sub read_cpio {
my ($dirname, @args) = @_;
die("read_cpio: no content attached\n") unless have_content();
my $req = $BSServer::request;
send_continue() if $req->{'need_continue'};
$req->{'__socket'} = \*CLNT;
my $res = BSHTTP::cpio_receiver($req, {'directory' => $dirname, @args});
delete $req->{'__socket'};
return $res;
}
sub read_data {
my ($maxl, $exact) = @_;
die("read_data: no content attached\n") unless have_content();
my $req = $BSServer::request;
send_continue() if $req->{'need_continue'};
$req->{'__socket'} = \*CLNT;
my $res = BSHTTP::read_data($req, $maxl, $exact);
delete $req->{'__socket'};
return $res;
}
###########################################################################
sub reply_cpio {
my ($files, @hdrs) = @_;
my $req = $BSServer::request || {};
reply(undef, 'Content-Type: application/x-cpio', 'Transfer-Encoding: chunked', @hdrs);
$req->{'replying'} = 2;
BSHTTP::cpio_sender({'cpiofiles' => $files, 'chunked' => 1}, \*CLNT);
swrite("0\r\n\r\n");
}
sub reply_file {
my ($file, @hdrs) = @_;
my $req = $BSServer::request || {};
my $chunked;
$chunked = 1 if grep {/^transfer-encoding:\s*chunked/i} @hdrs;
my $cl = (grep {/^content-length:/i} @hdrs)[0];
if (!$cl && !$chunked) {
# detect file size
if (!ref($file)) {
my $fd = gensym;
open($fd, '<', $file) || die("$file: $!\n");
$file = $fd;
}
if (-f $file) {
my $size = -s $file;
$cl = "Content-Length: $size";
push @hdrs, $cl;
} else {
push @hdrs, 'Transfer-Encoding: chunked';
$chunked = 1;
}
}
unshift @hdrs, 'Content-Type: application/octet-stream' unless grep {/^content-type:/i} @hdrs;
reply(undef, @hdrs);
$req->{'replying'} = 2 if $chunked;
my $param = {'filename' => $file};
$param->{'bytes'} = $1 if $cl && $cl =~ /(\d+)/; # limit to content length
$param->{'chunked'} = 1 if $chunked;
BSHTTP::file_sender($param, \*CLNT);
swrite("0\r\n\r\n") if $chunked;
}
sub reply_receiver {
my ($req, $param) = @_;
my $replyreq = $BSServer::request || {};
my $hdr = $req->{'headers'};
$param->{'reply_receiver_called'} = 1;
my $st = $hdr->{'status'};
my $ct = $hdr->{'content-type'} || 'text/plain';
my $cl = $hdr->{'content-length'};
my $chunked;
$chunked = 1 if $hdr->{'transfer-encoding'} && lc($hdr->{'transfer-encoding'}) eq 'chunked';
my @hdrs;
push @hdrs, "Status: $st" if $st;
push @hdrs, "Content-Type: $ct";
push @hdrs, "Content-Length: $cl" if defined($cl) && !$chunked;
push @hdrs, 'Transfer-Encoding: chunked' if $chunked;
reply(undef, @hdrs);
$replyreq->{'replying'} = 2 if $chunked;
while(1) {
my $data = BSHTTP::read_data($req, 8192);
last unless defined($data) && $data ne '';
swrite($data, $chunked);
}
swrite("0\r\n\r\n") if $chunked;
}
###########################################################################
# sender (like file_sender in BSHTTP) that forwards received data
sub forward_sender {
my ($param, $sock) = @_;
my $data;
while (($data = read_data(8192)) ne '') {
BSHTTP::swrite($sock, $data, $param->{'chunked'});
}
return '';
}
1;
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