Coro/myhttpd/httpd.pl

use Coro;
use Coro::Semaphore;
use Coro::Event;
use Coro::Socket;

no utf8;
use bytes;

# at least on my machine, this thingy serves files
# quite a bit faster than apache, ;)
# and quite a bit slower than thttpd :(

$SIG{PIPE} = 'IGNORE';
   
sub slog {
   my $level = shift;
   my $format = shift;
   printf "---: $format\n", @_;
}

my $connections = new Coro::Semaphore $MAX_CONNECTS;

my @newcons;
my @pool;

# one "execution thread"
sub handler {
   while () {
      my $new = pop @newcons;
      if ($new) {
         eval {
            conn->new(@$new)->handle;
         };
         slog 1, "$@" if $@ && !ref $@;
         $connections->up;
      } else {
         last if @pool >= $MAX_POOL;
         push @pool, $Coro::current;
         schedule;
      }
   }
}

my $http_port = new Coro::Socket
        LocalAddr => $SERVER_HOST,
        LocalPort => $SERVER_PORT,
        ReuseAddr => 1,
        Listen => 50,
   or die "unable to start server";

push @listen_sockets, $http_port;

# the "main thread"
async {
   slog 1, "accepting connections";
   while () {
      $connections->down;
      push @newcons, [$http_port->accept];
      #slog 3, "accepted @$connections ".scalar(@pool);
      $::NOW = time;
      if (@pool) {
         (pop @pool)->ready;
      } else {
         async \&handler;
      }

   }
};

package conn;

use Socket;
use HTTP::Date;
use Convert::Scalar 'weaken';

our %conn; # $conn{ip}{fh} => connobj
our %blocked;
our %mimetype;

sub read_mimetypes {
   local *M;
   if (open M, "<mime_types") {
      while (<M>) {
         if (/^([^#]\S+)\t+(\S+)$/) {
            $mimetype{lc $1} = $2;
         }
      }
   } else {
      print "cannot open mime_types\n";
   }
}

read_mimetypes;

sub new {
   my $class = shift;
   my $peername = shift;
   my $fh = shift;
   my $self = bless { fh => $fh }, $class;
   my (undef, $iaddr) = unpack_sockaddr_in $peername
      or $self->err(500, "unable to decode peername");

   $self->{remote_addr} = inet_ntoa $iaddr;
   $self->{time} = $::NOW;

   # enter ourselves into various lists
   weaken ($conn{$self->{remote_addr}}{$self*1} = $self);

   $::conns++;

   $self;
}

sub DESTROY {
   my $self = shift;

   $::conns--;

   delete $conn{$self->{remote_addr}}{$self*1};
   delete $uri{$self->{remote_addr}}{$self->{uri}}{$self*1};
}

sub slog {
   my $self = shift;
   main::slog($_[0], "$self->{remote_addr}> $_[1]");
}

sub response {
   my ($self, $code, $msg, $hdr, $content) = @_;
   my $res = "HTTP/1.0 $code $msg\015\012";

   $res .= "Connection: close\015\012";
   $res .= "Date: ".(time2str $::NOW)."\015\012"; # slow? nah. :(

   while (my ($h, $v) = each %$hdr) {
      $res .= "$h: $v\015\012"
   }
   $res .= "\015\012";

   $res .= $content if defined $content and $self->{method} ne "HEAD";

   print STDERR "$self->{remote_addr} \"$self->{uri}\" $code ".$hdr->{"Content-Length"}." \"$self->{h}{referer}\"\n";#d#

   $self->{written} +=
      print {$self->{fh}} $res;
}

sub err {
   my $self = shift;
   my ($code, $msg, $hdr, $content) = @_;

   unless (defined $content) {
      $content = "$code $msg";
      $hdr->{"Content-Type"} = "text/plain";
      $hdr->{"Content-Length"} = length $content;
   }

   $self->response($code, $msg, $hdr, $content);

   die bless {}, err::;
}

sub err_blocked {
   my $self = shift;
   my $ip = $self->{remote_addr};
   my $time = time2str $blocked{$ip} = $::NOW + $::BLOCKTIME;

   Coro::Event::do_timer(after => 15);

   $self->err(401, "too many connections",
              {
                 "Content-Type" => "text/html",
                 "Retry-After" => $::BLOCKTIME
              },
              <<EOF);
<html><p>
You have been blocked because you opened too many connections. You
may retry at</p>

   <p><blockquote>$time.</blockquote></p>
   
<p>Until then, each new access will renew the block. You might want to have a
look at the <a href="http://www.goof.com/pcg/marc/animefaq.html">FAQ</a>.</p>
</html>
EOF
}

sub handle {
   my $self = shift;
   my $fh = $self->{fh};

   #while() {
      $self->{h} = {};

      # read request and parse first line
      $fh->timeout($::REQ_TIMEOUT);
      my $req = $fh->readline("\015\012\015\012");
      $fh->timeout($::RES_TIMEOUT);

      defined $req or
         $self->err(408, "request timeout");

      my $ip = $self->{remote_addr};

         $self->err_blocked($blocked{$ip});
      if ($blocked{$ip}) {
         $self->err_blocked($blocked{$ip})
            if $blocked{$ip} > $::NOW;

         delete $blocked{$ip};
      }

      if (%{$conn{$ip}} > $::MAX_CONN_IP) {
         $self->slog(2, "blocked ip $ip");
         $self->err_blocked;
      }

      $req =~ /^(?:\015\012)?
                (GET|HEAD) \040+
                ([^\040]+) \040+
                HTTP\/([0-9]+\.[0-9]+)
                \015\012/gx
         or $self->err(405, "method not allowed", { Allow => "GET,HEAD" });

      $2 ne "1.0"
         or $self->err(506, "http protocol version not supported");

      $self->{method} = $1;
      $self->{uri} = $2;

      # parse headers
      {
         my (%hdr, $h, $v);

         $hdr{lc $1} .= ",$2"
            while $req =~ /\G
                  ([^:\000-\040]+):
                  [\008\040]*
                  ((?: [^\015\012]+ | \015\012[\008\040] )*)
                  \015\012
               /gxc;

         $req =~ /\G\015\012$/
            or $self->err(400, "bad request");

         $self->{h}{$h} = substr $v, 1
            while ($h, $v) = each %hdr;
      }

      $self->{server_port} = $self->{h}{host} =~ s/:([0-9]+)$// ? $1 : 80;

      weaken ($uri{$self->{remote_addr}}{$self->{uri}}{$self*1} = $self);

      $self->map_uri;
      $self->respond;
   #}
}

# uri => path mapping
sub map_uri {
   my $self = shift;
   my $host = $self->{h}{host} || "default";
   my $uri = $self->{uri};

   # some massaging, also makes it more secure
   $uri =~ s/%([0-9a-fA-F][0-9a-fA-F])/chr hex $1/ge;
   $uri =~ s%//+%/%g;
   $uri =~ s%/\.(?=/|$)%%g;
   1 while $uri =~ s%/[^/]+/\.\.(?=/|$)%%;

   $uri =~ m%^/?\.\.(?=/|$)%
      and $self->err(400, "bad request");

   $self->{name} = $uri;

   # now do the path mapping
   $self->{path} = "$::DOCROOT/$host$uri";

   $self->access_check;
}

sub server_address {
   my $self = shift;
   my ($port, $iaddr) = unpack_sockaddr_in $self->{fh}->getsockname
      or $self->err(500, "unable to get socket name");
   ((inet_ntoa $iaddr), $port);
}

sub server_host {
   my $self = shift;
   if (exists $self->{h}{host}) {
      return $self->{h}{host};
   } else {
      return (($self->server_address)[0]);
   }
}

sub server_hostport {
   my $self = shift;
   my ($host, $port);
   if (exists $self->{h}{host}) {
      ($host, $port) = ($self->{h}{host}, $self->{server_port});
   } else {
      ($host, $port) = $self->server_address;
   }
   $port = $port == 80 ? "" : ":$port";
   $host.$port;
}

sub _cgi {
   my $self = shift;
   my $path = shift;
   my $fh;

   # no two-way xxx supported
   if (0 == fork) {
      open STDOUT, ">&".fileno($self->{fh});
      if (chdir $::DOCROOT) {
         $ENV{SERVER_SOFTWARE} = "thttpd-myhttpd"; # we are thttpd-alike
         $ENV{HTTP_HOST}       = $self->server_host;
         $ENV{HTTP_PORT}       = $self->{server_host};
         $ENV{SCRIPT_NAME}     = $self->{name};
         exec $path;
      }
      Coro::State::_exit(0);
   } else {
   }
}

sub respond {
   my $self = shift;
   my $path = $self->{path};

   stat $path
      or $self->err(404, "not found");

   $self->{stat} = [stat _];

   # idiotic netscape sends idiotic headers AGAIN
   my $ims = $self->{h}{"if-modified-since"} =~ /^([^;]+)/
             ? str2time $1 : 0;

   if (-d _ && -r _) {
      # directory
      if ($path !~ /\/$/) {
         # create a redirect to get the trailing "/"
         my $host = $self->server_hostport;
         $self->err(301, "moved permanently", { Location =>  "http://$host$self->{uri}/" });
      } else {
         $ims < $self->{stat}[9]
            or $self->err(304, "not modified");

         if ($self->{method} eq "GET") {
            if (-r "$path/index.html") {
               $self->{path} .= "/index.html";
               $self->handle_file;
            } else {
               $self->handle_dir;
            }
         }
      }
   } elsif (-f _ && -r _) {
      -x _ and $self->err(403, "forbidden");
      $self->handle_file;
   } else {
      $self->err(404, "not found");
   }
}

sub handle_dir {
   my $self = shift;
   my $idx = $self->diridx;

   $self->response(200, "ok",
         {
            "Content-Type"   => "text/html",
            "Content-Length" => length $idx,
         },
         $idx);
}

sub handle_file {
   my $self = shift;
   my $length = -s _;
   my $hdr = {
      "Last-Modified"  => time2str ((stat _)[9]),
   };

   my @code = (200, "ok");
   my ($l, $h);

   if ($self->{h}{range} =~ /^bytes=(.*)$/) {
      for (split /,/, $1) {
         if (/^-(\d+)$/) {
            ($l, $h) = ($length - $1, $length - 1);
         } elsif (/^(\d+)-(\d*)$/) {
            ($l, $h) = ($1, ($2 ne "" || $2 >= $length) ? $2 : $length - 1);
         } else {
            ($l, $h) = (0, $length - 1);
            goto ignore;
         }
         goto satisfiable if $l >= 0 && $l < $length && $h >= 0 && $h > $l;
      }
      $hdr->{"Content-Range"} = "bytes */$length";
      $self->err(416, "not satisfiable", $hdr);

satisfiable:
      # check for segmented downloads
      if ($l && $::NO_SEGMENTED) {
         if (%{$uri{$self->{remote_addr}}{$self->{uri}}} > 1) {
            Coro::Event::do_timer(after => 15);

            $self->err(400, "segmented downloads are not allowed");
         }
      }

      $hdr->{"Content-Range"} = "bytes $l-$h/$length";
      @code = (206, "partial content");
      $length = $h - $l + 1;

ignore:
   } else {
      ($l, $h) = (0, $length - 1);
   }

   $self->{path} =~ /\.([^.]+)$/;
   $hdr->{"Content-Type"} = $mimetype{lc $1} || "application/octet-stream";
   $hdr->{"Content-Length"} = $length;

   $self->response(@code, $hdr, "");

   if ($self->{method} eq "GET") {
      my ($fh, $buf);
      open $fh, "<", $self->{path}
         or die "$self->{path}: late open failure ($!)";

      if ($l) {
         sysseek $fh, $l, 0
            or die "$self->{path}: cannot seek to $l ($!)";
      }

      $h -= $l - 1;

      while ($h > 0) {
         $h -= sysread $fh, $buf, $h > $::BUFSIZE ? $::BUFSIZE : $h;
         my $w = $self->{fh}->syswrite($buf)
            or last;
         $::written += $w;
         $self->{written} += $w;
      }
   }

   close $fh;
}

1;
Revision:	1.14
Committed:	Sun Aug 12 14:09:03 2001 UTC (25 years, 2 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.13:	+7 -2 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	use Coro;
2			use Coro::Semaphore;
3			use Coro::Event;
4			use Coro::Socket;
5
6			no utf8;
7			use bytes;
8
9			# at least on my machine, this thingy serves files
10			# quite a bit faster than apache, ;)
11			# and quite a bit slower than thttpd :(
12
13			$SIG{PIPE} = 'IGNORE';
14
15			sub slog {
16			my $level = shift;
17			my $format = shift;
18			printf "---: $format\n", @_;
19			}
20
21			my $connections = new Coro::Semaphore $MAX_CONNECTS;
22
23	root	1.6	my @newcons;
24	root	1.1	my @pool;
25
26	root	1.2	# one "execution thread"
27	root	1.1	sub handler {
28			while () {
29	root	1.6	my $new = pop @newcons;
30			if ($new) {
31	root	1.1	eval {
32	root	1.6	conn->new(@$new)->handle;
33	root	1.1	};
34			slog 1, "$@" if $@ && !ref $@;
35			$connections->up;
36			} else {
37			last if @pool >= $MAX_POOL;
38			push @pool, $Coro::current;
39			schedule;
40			}
41			}
42			}
43
44	root	1.4	my $http_port = new Coro::Socket
45			LocalAddr => $SERVER_HOST,
46			LocalPort => $SERVER_PORT,
47			ReuseAddr => 1,
48	root	1.13	Listen => 50,
49	root	1.4	or die "unable to start server";
50
51			push @listen_sockets, $http_port;
52
53	root	1.2	# the "main thread"
54	root	1.1	async {
55			slog 1, "accepting connections";
56			while () {
57			$connections->down;
58	root	1.6	push @newcons, [$http_port->accept];
59	root	1.1	#slog 3, "accepted @$connections ".scalar(@pool);
60	root	1.3	$::NOW = time;
61	root	1.1	if (@pool) {
62			(pop @pool)->ready;
63			} else {
64			async \&handler;
65			}
66
67			}
68			};
69
70			package conn;
71
72			use Socket;
73			use HTTP::Date;
74	root	1.2	use Convert::Scalar 'weaken';
75
76	root	1.3	our %conn; # $conn{ip}{fh} => connobj
77			our %blocked;
78	root	1.9	our %mimetype;
79
80			sub read_mimetypes {
81			local *M;
82	root	1.10	if (open M, "<mime_types") {
83	root	1.9	while (<M>) {
84			if (/^([^#]\S+)\t+(\S+)$/) {
85			$mimetype{lc $1} = $2;
86			}
87			}
88			} else {
89	root	1.10	print "cannot open mime_types\n";
90	root	1.9	}
91			}
92	root	1.1
93	root	1.10	read_mimetypes;
94
95	root	1.1	sub new {
96			my $class = shift;
97	root	1.6	my $peername = shift;
98	root	1.1	my $fh = shift;
99	root	1.2	my $self = bless { fh => $fh }, $class;
100	root	1.6	my (undef, $iaddr) = unpack_sockaddr_in $peername
101			or $self->err(500, "unable to decode peername");
102	root	1.7
103	root	1.3	$self->{remote_addr} = inet_ntoa $iaddr;
104	root	1.11	$self->{time} = $::NOW;
105	root	1.2
106			# enter ourselves into various lists
107	root	1.3	weaken ($conn{$self->{remote_addr}}{$self*1} = $self);
108
109	root	1.13	$::conns++;
110
111	root	1.2	$self;
112			}
113
114			sub DESTROY {
115			my $self = shift;
116	root	1.13
117			$::conns--;
118
119	root	1.3	delete $conn{$self->{remote_addr}}{$self*1};
120	root	1.13	delete $uri{$self->{remote_addr}}{$self->{uri}}{$self*1};
121	root	1.1	}
122
123			sub slog {
124	root	1.4	my $self = shift;
125			main::slog($_[0], "$self->{remote_addr}> $_[1]");
126	root	1.1	}
127
128	root	1.4	sub response {
129	root	1.1	my ($self, $code, $msg, $hdr, $content) = @_;
130			my $res = "HTTP/1.0 $code $msg\015\012";
131
132	root	1.4	$res .= "Connection: close\015\012";
133			$res .= "Date: ".(time2str $::NOW)."\015\012"; # slow? nah. :(
134	root	1.1
135			while (my ($h, $v) = each %$hdr) {
136			$res .= "$h: $v\015\012"
137			}
138	root	1.10	$res .= "\015\012";
139	root	1.4
140	root	1.13	$res .= $content if defined $content and $self->{method} ne "HEAD";
141	root	1.1
142	root	1.3	print STDERR "$self->{remote_addr} \"$self->{uri}\" $code ".$hdr->{"Content-Length"}." \"$self->{h}{referer}\"\n";#d#
143	root	1.2
144	root	1.11	$self->{written} +=
145			print {$self->{fh}} $res;
146	root	1.1	}
147
148			sub err {
149			my $self = shift;
150			my ($code, $msg, $hdr, $content) = @_;
151
152			unless (defined $content) {
153			$content = "$code $msg";
154			$hdr->{"Content-Type"} = "text/plain";
155			$hdr->{"Content-Length"} = length $content;
156			}
157
158	root	1.4	$self->response($code, $msg, $hdr, $content);
159	root	1.1
160			die bless {}, err::;
161			}
162
163	root	1.3	sub err_blocked {
164			my $self = shift;
165			my $ip = $self->{remote_addr};
166			my $time = time2str $blocked{$ip} = $::NOW + $::BLOCKTIME;
167	root	1.10
168	root	1.14	Coro::Event::do_timer(after => 15);
169
170			$self->err(401, "too many connections",
171	root	1.4	{
172			"Content-Type" => "text/html",
173			"Retry-After" => $::BLOCKTIME
174			},
175	root	1.3	<<EOF);
176	root	1.4	<html><p>
177	root	1.3	You have been blocked because you opened too many connections. You
178	root	1.4	may retry at</p>
179
180			<p><blockquote>$time.</blockquote></p>
181
182			<p>Until then, each new access will renew the block. You might want to have a
183			look at the <a href="http://www.goof.com/pcg/marc/animefaq.html">FAQ</a>.</p>
184			</html>
185	root	1.3	EOF
186			}
187
188	root	1.1	sub handle {
189			my $self = shift;
190			my $fh = $self->{fh};
191
192			#while() {
193			$self->{h} = {};
194
195			# read request and parse first line
196			$fh->timeout($::REQ_TIMEOUT);
197			my $req = $fh->readline("\015\012\015\012");
198			$fh->timeout($::RES_TIMEOUT);
199
200			defined $req or
201			$self->err(408, "request timeout");
202
203	root	1.3	my $ip = $self->{remote_addr};
204
205	root	1.14	$self->err_blocked($blocked{$ip});
206	root	1.3	if ($blocked{$ip}) {
207			$self->err_blocked($blocked{$ip})
208			if $blocked{$ip} > $::NOW;
209
210			delete $blocked{$ip};
211			}
212
213			if (%{$conn{$ip}} > $::MAX_CONN_IP) {
214	root	1.12	$self->slog(2, "blocked ip $ip");
215	root	1.3	$self->err_blocked;
216			}
217
218	root	1.1	$req =~ /^(?:\015\012)?
219			(GET\|HEAD) \040+
220			([^\040]+) \040+
221			HTTP\/([0-9]+\.[0-9]+)
222			\015\012/gx
223	root	1.14	or $self->err(405, "method not allowed", { Allow => "GET,HEAD" });
224	root	1.1
225			$2 ne "1.0"
226			or $self->err(506, "http protocol version not supported");
227
228			$self->{method} = $1;
229			$self->{uri} = $2;
230
231			# parse headers
232			{
233			my (%hdr, $h, $v);
234
235			$hdr{lc $1} .= ",$2"
236			while $req =~ /\G
237			([^:\000-\040]+):
238			[\008\040]*
239			((?: [^\015\012]+ \| \015\012[\008\040] )*)
240			\015\012
241			/gxc;
242
243			$req =~ /\G\015\012$/
244			or $self->err(400, "bad request");
245
246			$self->{h}{$h} = substr $v, 1
247			while ($h, $v) = each %hdr;
248			}
249
250			$self->{server_port} = $self->{h}{host} =~ s/:([0-9]+)$// ? $1 : 80;
251	root	1.3
252	root	1.13	weaken ($uri{$self->{remote_addr}}{$self->{uri}}{$self*1} = $self);
253	root	1.1
254			$self->map_uri;
255			$self->respond;
256			#}
257			}
258
259			# uri => path mapping
260			sub map_uri {
261			my $self = shift;
262			my $host = $self->{h}{host} \|\| "default";
263			my $uri = $self->{uri};
264
265			# some massaging, also makes it more secure
266			$uri =~ s/%([0-9a-fA-F][0-9a-fA-F])/chr hex $1/ge;
267			$uri =~ s%//+%/%g;
268			$uri =~ s%/\.(?=/\|$)%%g;
269			1 while $uri =~ s%/[^/]+/\.\.(?=/\|$)%%;
270
271			$uri =~ m%^/?\.\.(?=/\|$)%
272			and $self->err(400, "bad request");
273
274			$self->{name} = $uri;
275
276			# now do the path mapping
277			$self->{path} = "$::DOCROOT/$host$uri";
278	root	1.7
279			$self->access_check;
280	root	1.1	}
281
282			sub server_address {
283			my $self = shift;
284			my ($port, $iaddr) = unpack_sockaddr_in $self->{fh}->getsockname
285			or $self->err(500, "unable to get socket name");
286			((inet_ntoa $iaddr), $port);
287			}
288
289			sub server_host {
290			my $self = shift;
291			if (exists $self->{h}{host}) {
292			return $self->{h}{host};
293			} else {
294			return (($self->server_address)[0]);
295			}
296			}
297
298			sub server_hostport {
299			my $self = shift;
300			my ($host, $port);
301			if (exists $self->{h}{host}) {
302			($host, $port) = ($self->{h}{host}, $self->{server_port});
303			} else {
304			($host, $port) = $self->server_address;
305			}
306			$port = $port == 80 ? "" : ":$port";
307			$host.$port;
308			}
309
310			sub _cgi {
311			my $self = shift;
312			my $path = shift;
313			my $fh;
314
315			# no two-way xxx supported
316			if (0 == fork) {
317			open STDOUT, ">&".fileno($self->{fh});
318			if (chdir $::DOCROOT) {
319			$ENV{SERVER_SOFTWARE} = "thttpd-myhttpd"; # we are thttpd-alike
320			$ENV{HTTP_HOST} = $self->server_host;
321			$ENV{HTTP_PORT} = $self->{server_host};
322			$ENV{SCRIPT_NAME} = $self->{name};
323	root	1.10	exec $path;
324	root	1.1	}
325			Coro::State::_exit(0);
326			} else {
327			}
328			}
329
330			sub respond {
331			my $self = shift;
332			my $path = $self->{path};
333
334			stat $path
335			or $self->err(404, "not found");
336
337	root	1.10	$self->{stat} = [stat _];
338
339	root	1.1	# idiotic netscape sends idiotic headers AGAIN
340			my $ims = $self->{h}{"if-modified-since"} =~ /^([^;]+)/
341			? str2time $1 : 0;
342
343			if (-d _ && -r _) {
344			# directory
345			if ($path !~ /\/$/) {
346			# create a redirect to get the trailing "/"
347			my $host = $self->server_hostport;
348			$self->err(301, "moved permanently", { Location => "http://$host$self->{uri}/" });
349			} else {
350	root	1.10	$ims < $self->{stat}[9]
351	root	1.1	or $self->err(304, "not modified");
352
353			if ($self->{method} eq "GET") {
354			if (-r "$path/index.html") {
355			$self->{path} .= "/index.html";
356			$self->handle_file;
357			} else {
358			$self->handle_dir;
359			}
360			}
361			}
362			} elsif (-f _ && -r _) {
363			-x _ and $self->err(403, "forbidden");
364			$self->handle_file;
365			} else {
366			$self->err(404, "not found");
367			}
368			}
369
370			sub handle_dir {
371			my $self = shift;
372	root	1.10	my $idx = $self->diridx;
373
374			$self->response(200, "ok",
375			{
376			"Content-Type" => "text/html",
377			"Content-Length" => length $idx,
378			},
379			$idx);
380	root	1.1	}
381
382			sub handle_file {
383			my $self = shift;
384			my $length = -s _;
385			my $hdr = {
386			"Last-Modified" => time2str ((stat _)[9]),
387			};
388
389			my @code = (200, "ok");
390			my ($l, $h);
391
392			if ($self->{h}{range} =~ /^bytes=(.*)$/) {
393			for (split /,/, $1) {
394			if (/^-(\d+)$/) {
395			($l, $h) = ($length - $1, $length - 1);
396			} elsif (/^(\d+)-(\d*)$/) {
397			($l, $h) = ($1, ($2 ne "" \|\| $2 >= $length) ? $2 : $length - 1);
398			} else {
399			($l, $h) = (0, $length - 1);
400			goto ignore;
401			}
402			goto satisfiable if $l >= 0 && $l < $length && $h >= 0 && $h > $l;
403			}
404			$hdr->{"Content-Range"} = "bytes */$length";
405			$self->err(416, "not satisfiable", $hdr);
406
407			satisfiable:
408	root	1.4	# check for segmented downloads
409	root	1.10	if ($l && $::NO_SEGMENTED) {
410	root	1.13	if (%{$uri{$self->{remote_addr}}{$self->{uri}}} > 1) {
411	root	1.14	Coro::Event::do_timer(after => 15);
412
413	root	1.4	$self->err(400, "segmented downloads are not allowed");
414			}
415			}
416
417	root	1.1	$hdr->{"Content-Range"} = "bytes $l-$h/$length";
418			@code = (206, "partial content");
419			$length = $h - $l + 1;
420
421			ignore:
422			} else {
423			($l, $h) = (0, $length - 1);
424			}
425
426	root	1.9	$self->{path} =~ /\.([^.]+)$/;
427			$hdr->{"Content-Type"} = $mimetype{lc $1} \|\| "application/octet-stream";
428	root	1.1	$hdr->{"Content-Length"} = $length;
429
430	root	1.4	$self->response(@code, $hdr, "");
431	root	1.1
432			if ($self->{method} eq "GET") {
433			my ($fh, $buf);
434			open $fh, "<", $self->{path}
435			or die "$self->{path}: late open failure ($!)";
436
437			if ($l) {
438			sysseek $fh, $l, 0
439			or die "$self->{path}: cannot seek to $l ($!)";
440			}
441
442			$h -= $l - 1;
443
444			while ($h > 0) {
445	root	1.5	$h -= sysread $fh, $buf, $h > $::BUFSIZE ? $::BUFSIZE : $h;
446	root	1.11	my $w = $self->{fh}->syswrite($buf)
447	root	1.1	or last;
448	root	1.11	$::written += $w;
449			$self->{written} += $w;
450	root	1.1	}
451			}
452
453			close $fh;
454	root	1.7	}
455
456	root	1.2	1;