/usr/lib/obs/server/BSHTTP.pm is in obs-server 2.7.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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
#
################################################################
#
# HTTP protocol functions. Also contains file/cpio sender/receiver.
#
package BSHTTP;
use POSIX;
use Digest::MD5 ();
use Fcntl qw(:DEFAULT);
use strict;
sub gethead {
my ($h, $t) = @_;
my ($field, $data);
for (split(/[\r\n]+/, $t)) {
next if $_ eq '';
if (/^[ \t]/s) {
s/^\s*/ /s;
$h->{$field} .= $_ if defined $field;
} else {
($field, $data) = split(/\s*:\s*/, $_, 2);
$field =~ tr/A-Z/a-z/;
$h->{$field} = $h->{$field} && $h->{$field} ne '' ? "$h->{$field},$data" : $data;
}
}
}
sub unexpected_eof {
my ($req) = @_;
$req->{'__eof'} = 1 if $req;
die("unexpected EOF\n");
}
#
# read data from socket, do chunk decoding if needed
# req: request data
# maxl = undef: read as much as you can
# exact = 1: read maxl data, maxl==undef -> read to eof;
#
sub read_data {
my ($req, $maxl, $exact) = @_;
my $ret = '';
my $hdr = $req->{'headers'} || {};
local *S = $req->{'__socket'};
if ($hdr->{'transfer-encoding'} && lc($hdr->{'transfer-encoding'}) eq 'chunked') {
my $cl = $req->{'__cl'} || 0;
if ($cl < 0) {
die("unexpected EOF\n") if $exact && defined($maxl) && length($ret) < $maxl;
return $ret;
}
my $qu = $req->{'__data'};
while (1) {
if (defined($maxl) && $maxl <= $cl) {
while(length($qu) < $maxl) {
my $r = sysread(S, $qu, 8192, length($qu));
unexpected_eof($req) if !$r && (defined($r) || ($! != POSIX::EINTR && $! != POSIX::EWOULDBLOCK));
}
$ret .= substr($qu, 0, $maxl);
$req->{'__cl'} = $cl - $maxl;
$req->{'__data'} = substr($qu, $maxl);
return $ret;
}
if ($cl) {
# no maxl or maxl > cl, read full cl
while(length($qu) < $cl) {
my $r = sysread(S, $qu, 8192, length($qu));
unexpected_eof($req) if !$r && (defined($r) || ($! != POSIX::EINTR && $! != POSIX::EWOULDBLOCK));
}
$ret .= substr($qu, 0, $cl);
$qu = substr($qu, $cl);
$maxl -= $cl if defined $maxl;
$cl = 0;
if (!defined($maxl) && !$exact) { # no maxl, return every chunk
$req->{'__cl'} = $cl;
$req->{'__data'} = $qu;
return $ret;
}
}
# reached end of chunk, prepare for next one
while ($qu !~ /\r?\n/s) {
my $r = sysread(S, $qu, 8192, length($qu));
unexpected_eof($req) if !$r && (defined($r) || ($! != POSIX::EINTR && $! != POSIX::EWOULDBLOCK));
}
if (substr($qu, 0, 1) eq "\n") {
$qu = substr($qu, 1);
next;
}
if (substr($qu, 0, 2) eq "\r\n") {
$qu = substr($qu, 2);
next;
}
die("bad CHUNK data: $qu\n") unless $qu =~ /^([0-9a-fA-F]+)/;
$cl = hex($1);
die if $cl < 0;
$qu =~ s/^.*?\r?\n//s;
if ($cl == 0) {
$req->{'__cl'} = -1; # mark EOF
$req->{'__eof'} = 1;
die("unexpected EOF\n") if $exact && defined($maxl) && length($ret) < $maxl;
# read trailer
$qu = "\r\n$qu";
while ($qu !~ /\n\r?\n/s) {
my $r = sysread(S, $qu, 8192, length($qu));
unexpected_eof($req) if !$r && (defined($r) || ($! != POSIX::EINTR && $! != POSIX::EWOULDBLOCK));
}
$qu =~ /^(.*?)\n\r?\n/;
# get trailing header
gethead($hdr, length($1) >= 2 ? substr($1, 2) : '');
return $ret;
}
}
} else {
my $qu = $req->{'__data'};
my $cl = $req->{'__cl'};
$cl = $hdr->{'content-length'} unless defined $cl;
if (defined($cl) && (!defined($maxl) || $maxl > $cl)) {
die("unexpected EOF\n") if $exact && defined($maxl);
$maxl = $cl >= 0 ? $cl : 0;
}
while (!defined($maxl) || length($qu) < $maxl) {
my $m = ($maxl || 0) - length($qu);
$m = 8192 if $m < 8192;
my $r = sysread(S, $qu, $m, length($qu));
if (!$r && (defined($r) || ($! != POSIX::EINTR && $! != POSIX::EWOULDBLOCK))) {
$req->{'__eof'} = 1;
die("unexpected EOF\n") if defined($cl) || ($exact && defined($maxl));
$cl = $maxl = length($qu);
}
}
$cl -= $maxl if defined($cl);
$ret = substr($qu, 0, $maxl);
$req->{'__cl'} = $cl;
$req->{'__data'} = substr($qu, $maxl);
$req->{'__eof'} = 1 if defined($cl) && $cl == 0;
return $ret;
}
}
sub str2req {
my ($str) = @_;
my $req = {
'__data' => $str,
'__cl' => length($str),
};
return $req;
}
sub fd2req {
my ($fd) = @_;
my $req = {
'__data' => '',
'__socket' => $fd,
'__cl' => -s *$fd,
};
return $req;
}
sub null_receiver {
my ($req, $param) = @_;
1 while(read_data($req, 8192) ne '');
return '';
}
sub file_receiver {
my ($req, $param) = @_;
die("file_receiver: no filename\n") unless defined $param->{'filename'};
my $fn = $param->{'filename'};
my $withmd5 = $param->{'withmd5'};
local *F;
my $ctx;
$ctx = Digest::MD5->new if $withmd5;
open(F, '>', $fn) || die("$fn: $!\n");
my $size = 0;
while(1) {
my $s = read_data($req, 8192);
last if $s eq '';
(syswrite(F, $s) || 0) == length($s) || die("syswrite: $!\n");
$size += length($s);
$ctx->add($s) if $ctx;
}
close(F) || die("close: $!\n");
my $res = {size => $size};
$res->{'md5'} = $ctx->hexdigest if $ctx;
return $res;
}
sub cpio_receiver {
my ($req, $param) = @_;
my @res;
my $dn = $param->{'directory'};
my $withmd5 = $param->{'withmd5'};
local *F;
while(1) {
my $cpiohead = read_data($req, 110, 1);
die("cpio: not a 'SVR4 no CRC ascii' cpio\n") unless substr($cpiohead, 0, 6) eq '070701';
my $mode = hex(substr($cpiohead, 14, 8));
my $mtime = hex(substr($cpiohead, 46, 8));
my $size = hex(substr($cpiohead, 54, 8));
if ($size == 0xffffffff) {
# build service length extension
$cpiohead .= read_data($req, 16, 1);
$size = hex(substr($cpiohead, 62, 8)) * 4294967296. + hex(substr($cpiohead, 70, 8));
substr($cpiohead, 62, 16) = '';
}
my $nsize = hex(substr($cpiohead, 94, 8));
die("ridiculous long filename\n") if $nsize > 8192;
my $nsizepad = $nsize;
$nsizepad += 4 - ($nsize + 2 & 3) if $nsize + 2 & 3;
my $name = read_data($req, $nsizepad, 1);
$name =~ s/\0.*//s;
$name =~ s/^\.\///s;
my $sizepad = $size;
$sizepad += 4 - ($size % 4) if $size % 4;
last if !$size && $name eq 'TRAILER!!!';
if ($param->{'acceptsubdirs'} || $param->{'createsubdirs'}) {
die("cpio filename is illegal: $name\n") if "/$name/" =~ /\/\.{0,2}\//s;
} else {
die("cpio filename contains a '/': $name\n") if $name =~ /\//s;
}
die("cpio filename is '.' or '..'\n") if $name eq '.' || $name eq '..';
my $ent = {'name' => $name, 'size' => $size, 'mtime' => $mtime, 'mode' => $mode};
if ($param->{'accept'}) {
if (ref($param->{'accept'})) {
die("illegal file in cpio archive: $name\n") unless $param->{'accept'}->($param, $name, $ent);
} else {
die("illegal file in cpio archive: $name\n") unless $name =~ /$param->{'accept'}/;
}
}
if ($param->{'map'}) {
$ent->{'unmappedname'} = $name;
if (ref($param->{'map'})) {
$ent->{'name'} = $name = $param->{'map'}->($param, $name);
} else {
$ent->{'name'} = $name = "$param->{'map'}$name";
}
}
if (!defined($name)) {
# skip entry
while ($sizepad) {
my $m = $sizepad > 8192 ? 8192 : $sizepad;
read_data($req, $m, 1);
$sizepad -= $m;
}
next;
}
push @res, $ent;
my $ctx;
$ctx = Digest::MD5->new if $withmd5;
if (defined($dn)) {
my $filename = "$dn/$name";
if (($mode & 0xf000) == 0x4000 && $param->{'createsubdirs'}) {
die("directory has non-zero size\n") if $sizepad;
if (! -d $filename) {
unlink($filename) unless $param->{'no_unlink'};
mkdir($filename) || die("mkdir $filename: $!\n");
}
} else {
die("can only unpack plain files from cpio archive, file $name, mode was $mode\n") unless ($mode & 0xf000) == 0x8000;
unlink($filename) unless $param->{'no_unlink'};
open(F, '>', $filename) || die("$filename: $!\n");
}
} else {
$ent->{'data'} = '';
}
while ($sizepad) {
my $m = $sizepad > 8192 ? 8192 : $sizepad;
my $data = read_data($req, $m, 1);
$sizepad -= $m;
$size -= $m;
$m += $size if $size < 0;
if (defined($dn)) {
(syswrite(F, $data, $m) || 0) == $m || die("syswrite: $!\n");
} else {
$ent->{'data'} .= substr($data, 0, $m);
}
$ctx->add($size >= 0 ? $data : substr($data, 0, $m)) if $ctx;
}
if (defined($dn) && ($mode & 0xf000) != 0x4000) {
close(F) || die("close: $!\n");
utime($mtime, $mtime, "$dn/$name");
}
$ent->{'md5'} = $ctx->hexdigest if $ctx && ($mode & 0xf000) != 0x4000;
$param->{'cpiopostfile'}->($param, $ent) if $param->{'cpiopostfile'};
}
return \@res;
}
sub swrite {
my ($sock, $data, $chunked) = @_;
local *S = $sock;
return if $chunked && $data eq ''; # can't write that
$data = sprintf("%X\r\n", length($data)).$data."\r\n" if $chunked;
while (length($data)) {
my $l = syswrite(S, $data, length($data));
die("socket write: $!\n") unless $l;
$data = substr($data, $l);
}
}
sub makecpiohead {
my ($file, $s) = @_;
return "07070100000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000b00000000TRAILER!!!\0\0\0\0" if !$file;
my $name = $file->{'name'};
my $mode = $file->{'mode'} || 0x81a4;
my $mtime = $file->{'mtime'} || $s->[9];
my $h = sprintf("07070100000000%08x000000000000000000000001", $mode);
if ($s->[7] > 0xffffffff) {
# build service length extension
my $top = int($s->[7] / 4294967296.);
$h .= sprintf("%08xffffffff%08x%08x", $mtime, $top, $s->[7] - $top * 4294967296.);
} else {
$h .= sprintf("%08x%08x", $mtime, $s->[7]);
}
$h .= "00000000000000000000000000000000";
$h .= sprintf("%08x", length($name) + 1);
$h .= "00000000$name\0";
$h .= substr("\0\0\0\0", (length($h) & 3)) if length($h) & 3;
my $pad = $s->[7] % 4 ? substr("\0\0\0\0", $s->[7] % 4) : '';
return ($h, $pad);
}
sub cpio_sender {
my ($param, $sock) = @_;
local *F;
my ($data, $pad);
my $errors = {'__errors' => 1, 'name' => '.errors', 'data' => ''};
for my $file (@{$param->{'cpiofiles'} || []}, $errors) {
my @s;
if ($file->{'error'}) {
$errors->{'data'} .= "$file->{'name'}: $file->{'error'}\n";
next;
}
if (exists $file->{'filename'}) {
my $filename = $file->{'filename'};
if (ref($filename)) {
*F = $filename;
} elsif (!open(F, '<', $filename)) {
$errors->{'data'} .= "$file->{'name'}: $filename: $!\n";
next;
}
@s = stat(F);
if (!@s) {
$errors->{'data'} .= "$file->{'name'}: stat: $!\n";
close F unless ref $filename;
next;
}
if (ref($filename)) {
my $off = sysseek(F, 0, Fcntl::SEEK_CUR) || 0;
$s[7] -= $off if $off > 0;
}
($data, $pad) = makecpiohead($file, \@s);
my $l = $s[7];
my $r = 0;
while(1) {
$r = sysread(F, $data, $l > 8192 ? 8192 : $l, length($data)) if $l;
die "Error while reading file $file->{filename}: $!\n" if ! defined($r);
$data .= $pad if $r == $l;
swrite($sock, $data, $param->{'chunked'});
$data = '';
$l -= $r;
last unless $l;
}
die("internal error\n") if $l;
close F unless ref $filename;
} else {
next if $file->{'__errors'} && $file->{'data'} eq '';
$s[7] = length($file->{'data'});
$s[9] = time;
($data, $pad) = makecpiohead($file, \@s);
$data .= "$file->{'data'}$pad";
while ($param->{'chunked'} && length($data) > 8192) {
# keep chunks small
swrite($sock, substr($data, 0, 4096), $param->{'chunked'});
$data = substr($data, 4096);
}
swrite($sock, $data, $param->{'chunked'});
}
}
$data = makecpiohead();
swrite($sock, $data, $param->{'chunked'});
return '';
}
sub file_sender {
my ($param, $sock) = @_;
local *F;
my $bytes = $param->{'bytes'};
my $data;
if (ref($param->{'filename'})) {
*F = $param->{'filename'};
} else {
open(F, '<', $param->{'filename'}) || die("$param->{'filename'}: $!\n")
}
while(1) {
last if defined($bytes) && !$bytes;
my $r = sysread(F, $data, 8192);
last unless $r;
if ($bytes) {
$data = substr($data, 0, $bytes) if length($data) > $bytes;
$bytes -= length($data);
}
swrite($sock, $data, $param->{'chunked'});
}
close F unless ref $param->{'filename'};
return '';
}
1;
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