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';
use Linux::AIO;

Linux::AIO::min_parallel $::AIO_PARALLEL;

Event->io(fd => Linux::AIO::poll_fileno,
          poll => 'r', async => 1,
          cb => \&Linux::AIO::poll_cb );

Event->add_hooks(prepare => sub {
   &Coro::cede;
});

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/1.1 $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;
   }
   $hdr->{"Connection"} = "close";

   $self->response($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};

   $fh->timeout($::REQ_TIMEOUT);
   while() {
      $self->{reqs}++;

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

      unless (defined $req) {
         if (exists $self->{version}) {
            last;
         } else {
            $self->err(408, "request timeout");
         }
      }

      $self->{h} = {};

      $fh->timeout($::RES_TIMEOUT);
      my $ip = $self->{remote_addr};

      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" });

      $self->{method} = $1;
      $self->{uri} = $2;
      $self->{version} = $3;

      $3 eq "1.0" or $3 eq "1.1"
         or $self->err(506, "http protocol version $3 not supported");

      # 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;

      last if $self->{h}{connection} =~ /close/ || $self->{version} lt "1.1";

      $self->slog(9, "persistant connection [".$self->{h}{"user-agent"}."][$self->{reqs}]");
      $fh->timeout($::PER_TIMEOUT);
   }
}

# 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, $r);
      my $current = $Coro::current;
      open $fh, "<", $self->{path}
         or die "$self->{path}: late open failure ($!)";

      $h -= $l - 1;

      while ($h > 0) {
         aio_read($fh, $l, ($h > $::BUFSIZE ? $::BUFSIZE : $h),
                  $buf, 0, sub {
                     $r = $_[0];
                     $current->ready;
                  });
         &Coro::schedule;
         last unless $r;
         my $w = $self->{fh}->syswrite($buf)
            or last;
         $::written += $w;
         $self->{written} += $w;
         $l += $r;
      }
   }

   close $fh;
}

1;
Revision:	1.17
Committed:	Wed Aug 15 03:06:21 2001 UTC (22 years, 11 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.16:	+28 -16 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	root	1.16	use Linux::AIO;
76
77			Linux::AIO::min_parallel $::AIO_PARALLEL;
78
79			Event->io(fd => Linux::AIO::poll_fileno,
80	root	1.17	poll => 'r', async => 1,
81	root	1.16	cb => \&Linux::AIO::poll_cb );
82
83			Event->add_hooks(prepare => sub {
84	root	1.17	&Coro::cede;
85	root	1.16	});
86	root	1.2
87	root	1.3	our %conn; # $conn{ip}{fh} => connobj
88			our %blocked;
89	root	1.9	our %mimetype;
90
91			sub read_mimetypes {
92			local *M;
93	root	1.10	if (open M, "<mime_types") {
94	root	1.9	while (<M>) {
95			if (/^([^#]\S+)\t+(\S+)$/) {
96			$mimetype{lc $1} = $2;
97			}
98			}
99			} else {
100	root	1.10	print "cannot open mime_types\n";
101	root	1.9	}
102			}
103	root	1.1
104	root	1.10	read_mimetypes;
105
106	root	1.1	sub new {
107			my $class = shift;
108	root	1.6	my $peername = shift;
109	root	1.1	my $fh = shift;
110	root	1.2	my $self = bless { fh => $fh }, $class;
111	root	1.6	my (undef, $iaddr) = unpack_sockaddr_in $peername
112			or $self->err(500, "unable to decode peername");
113	root	1.7
114	root	1.3	$self->{remote_addr} = inet_ntoa $iaddr;
115	root	1.11	$self->{time} = $::NOW;
116	root	1.2
117			# enter ourselves into various lists
118	root	1.3	weaken ($conn{$self->{remote_addr}}{$self*1} = $self);
119
120	root	1.13	$::conns++;
121
122	root	1.2	$self;
123			}
124
125			sub DESTROY {
126			my $self = shift;
127	root	1.13
128			$::conns--;
129
130	root	1.3	delete $conn{$self->{remote_addr}}{$self*1};
131	root	1.13	delete $uri{$self->{remote_addr}}{$self->{uri}}{$self*1};
132	root	1.1	}
133
134			sub slog {
135	root	1.4	my $self = shift;
136			main::slog($_[0], "$self->{remote_addr}> $_[1]");
137	root	1.1	}
138
139	root	1.4	sub response {
140	root	1.1	my ($self, $code, $msg, $hdr, $content) = @_;
141	root	1.17	my $res = "HTTP/1.1 $code $msg\015\012";
142	root	1.1
143	root	1.17	#$res .= "Connection: close\015\012";
144	root	1.4	$res .= "Date: ".(time2str $::NOW)."\015\012"; # slow? nah. :(
145	root	1.1
146			while (my ($h, $v) = each %$hdr) {
147			$res .= "$h: $v\015\012"
148			}
149	root	1.10	$res .= "\015\012";
150	root	1.4
151	root	1.13	$res .= $content if defined $content and $self->{method} ne "HEAD";
152	root	1.1
153	root	1.3	print STDERR "$self->{remote_addr} \"$self->{uri}\" $code ".$hdr->{"Content-Length"}." \"$self->{h}{referer}\"\n";#d#
154	root	1.2
155	root	1.11	$self->{written} +=
156			print {$self->{fh}} $res;
157	root	1.1	}
158
159			sub err {
160			my $self = shift;
161			my ($code, $msg, $hdr, $content) = @_;
162
163			unless (defined $content) {
164			$content = "$code $msg";
165			$hdr->{"Content-Type"} = "text/plain";
166			$hdr->{"Content-Length"} = length $content;
167			}
168	root	1.17	$hdr->{"Connection"} = "close";
169	root	1.1
170	root	1.4	$self->response($code, $msg, $hdr, $content);
171	root	1.1
172			die bless {}, err::;
173			}
174
175	root	1.3	sub err_blocked {
176			my $self = shift;
177			my $ip = $self->{remote_addr};
178			my $time = time2str $blocked{$ip} = $::NOW + $::BLOCKTIME;
179	root	1.10
180	root	1.14	Coro::Event::do_timer(after => 15);
181
182			$self->err(401, "too many connections",
183	root	1.4	{
184			"Content-Type" => "text/html",
185			"Retry-After" => $::BLOCKTIME
186			},
187	root	1.3	<<EOF);
188	root	1.4	<html><p>
189	root	1.3	You have been blocked because you opened too many connections. You
190	root	1.4	may retry at</p>
191
192			<p><blockquote>$time.</blockquote></p>
193
194			<p>Until then, each new access will renew the block. You might want to have a
195			look at the <a href="http://www.goof.com/pcg/marc/animefaq.html">FAQ</a>.</p>
196			</html>
197	root	1.3	EOF
198			}
199
200	root	1.1	sub handle {
201			my $self = shift;
202			my $fh = $self->{fh};
203
204	root	1.17	$fh->timeout($::REQ_TIMEOUT);
205			while() {
206			$self->{reqs}++;
207	root	1.1
208			# read request and parse first line
209			my $req = $fh->readline("\015\012\015\012");
210
211	root	1.17	unless (defined $req) {
212			if (exists $self->{version}) {
213			last;
214			} else {
215			$self->err(408, "request timeout");
216			}
217			}
218
219			$self->{h} = {};
220	root	1.1
221	root	1.17	$fh->timeout($::RES_TIMEOUT);
222	root	1.3	my $ip = $self->{remote_addr};
223
224			if ($blocked{$ip}) {
225			$self->err_blocked($blocked{$ip})
226			if $blocked{$ip} > $::NOW;
227
228			delete $blocked{$ip};
229			}
230
231			if (%{$conn{$ip}} > $::MAX_CONN_IP) {
232	root	1.12	$self->slog(2, "blocked ip $ip");
233	root	1.3	$self->err_blocked;
234			}
235
236	root	1.1	$req =~ /^(?:\015\012)?
237			(GET\|HEAD) \040+
238			([^\040]+) \040+
239			HTTP\/([0-9]+\.[0-9]+)
240			\015\012/gx
241	root	1.14	or $self->err(405, "method not allowed", { Allow => "GET,HEAD" });
242	root	1.1
243			$self->{method} = $1;
244			$self->{uri} = $2;
245	root	1.17	$self->{version} = $3;
246
247			$3 eq "1.0" or $3 eq "1.1"
248			or $self->err(506, "http protocol version $3 not supported");
249	root	1.1
250			# parse headers
251			{
252			my (%hdr, $h, $v);
253
254			$hdr{lc $1} .= ",$2"
255			while $req =~ /\G
256			([^:\000-\040]+):
257			[\008\040]*
258			((?: [^\015\012]+ \| \015\012[\008\040] )*)
259			\015\012
260			/gxc;
261
262			$req =~ /\G\015\012$/
263			or $self->err(400, "bad request");
264
265			$self->{h}{$h} = substr $v, 1
266			while ($h, $v) = each %hdr;
267			}
268
269			$self->{server_port} = $self->{h}{host} =~ s/:([0-9]+)$// ? $1 : 80;
270	root	1.3
271	root	1.13	weaken ($uri{$self->{remote_addr}}{$self->{uri}}{$self*1} = $self);
272	root	1.1
273			$self->map_uri;
274			$self->respond;
275	root	1.17
276			last if $self->{h}{connection} =~ /close/ \|\| $self->{version} lt "1.1";
277
278			$self->slog(9, "persistant connection [".$self->{h}{"user-agent"}."][$self->{reqs}]");
279			$fh->timeout($::PER_TIMEOUT);
280			}
281	root	1.1	}
282
283			# uri => path mapping
284			sub map_uri {
285			my $self = shift;
286			my $host = $self->{h}{host} \|\| "default";
287			my $uri = $self->{uri};
288
289			# some massaging, also makes it more secure
290			$uri =~ s/%([0-9a-fA-F][0-9a-fA-F])/chr hex $1/ge;
291			$uri =~ s%//+%/%g;
292			$uri =~ s%/\.(?=/\|$)%%g;
293			1 while $uri =~ s%/[^/]+/\.\.(?=/\|$)%%;
294
295			$uri =~ m%^/?\.\.(?=/\|$)%
296			and $self->err(400, "bad request");
297
298			$self->{name} = $uri;
299
300			# now do the path mapping
301			$self->{path} = "$::DOCROOT/$host$uri";
302	root	1.7
303			$self->access_check;
304	root	1.1	}
305
306			sub server_address {
307			my $self = shift;
308			my ($port, $iaddr) = unpack_sockaddr_in $self->{fh}->getsockname
309			or $self->err(500, "unable to get socket name");
310			((inet_ntoa $iaddr), $port);
311			}
312
313			sub server_host {
314			my $self = shift;
315			if (exists $self->{h}{host}) {
316			return $self->{h}{host};
317			} else {
318			return (($self->server_address)[0]);
319			}
320			}
321
322			sub server_hostport {
323			my $self = shift;
324			my ($host, $port);
325			if (exists $self->{h}{host}) {
326			($host, $port) = ($self->{h}{host}, $self->{server_port});
327			} else {
328			($host, $port) = $self->server_address;
329			}
330			$port = $port == 80 ? "" : ":$port";
331			$host.$port;
332			}
333
334			sub _cgi {
335			my $self = shift;
336			my $path = shift;
337			my $fh;
338
339			# no two-way xxx supported
340			if (0 == fork) {
341			open STDOUT, ">&".fileno($self->{fh});
342			if (chdir $::DOCROOT) {
343			$ENV{SERVER_SOFTWARE} = "thttpd-myhttpd"; # we are thttpd-alike
344			$ENV{HTTP_HOST} = $self->server_host;
345			$ENV{HTTP_PORT} = $self->{server_host};
346			$ENV{SCRIPT_NAME} = $self->{name};
347	root	1.10	exec $path;
348	root	1.1	}
349			Coro::State::_exit(0);
350			} else {
351			}
352			}
353
354			sub respond {
355			my $self = shift;
356			my $path = $self->{path};
357
358			stat $path
359			or $self->err(404, "not found");
360
361	root	1.10	$self->{stat} = [stat _];
362
363	root	1.1	# idiotic netscape sends idiotic headers AGAIN
364			my $ims = $self->{h}{"if-modified-since"} =~ /^([^;]+)/
365			? str2time $1 : 0;
366
367			if (-d _ && -r _) {
368			# directory
369			if ($path !~ /\/$/) {
370			# create a redirect to get the trailing "/"
371			my $host = $self->server_hostport;
372			$self->err(301, "moved permanently", { Location => "http://$host$self->{uri}/" });
373			} else {
374	root	1.10	$ims < $self->{stat}[9]
375	root	1.1	or $self->err(304, "not modified");
376
377			if ($self->{method} eq "GET") {
378			if (-r "$path/index.html") {
379			$self->{path} .= "/index.html";
380			$self->handle_file;
381			} else {
382			$self->handle_dir;
383			}
384			}
385			}
386			} elsif (-f _ && -r _) {
387			-x _ and $self->err(403, "forbidden");
388			$self->handle_file;
389			} else {
390			$self->err(404, "not found");
391			}
392			}
393
394			sub handle_dir {
395			my $self = shift;
396	root	1.10	my $idx = $self->diridx;
397
398			$self->response(200, "ok",
399			{
400			"Content-Type" => "text/html",
401			"Content-Length" => length $idx,
402			},
403			$idx);
404	root	1.1	}
405
406			sub handle_file {
407			my $self = shift;
408			my $length = -s _;
409			my $hdr = {
410			"Last-Modified" => time2str ((stat _)[9]),
411			};
412
413			my @code = (200, "ok");
414			my ($l, $h);
415
416			if ($self->{h}{range} =~ /^bytes=(.*)$/) {
417			for (split /,/, $1) {
418			if (/^-(\d+)$/) {
419			($l, $h) = ($length - $1, $length - 1);
420			} elsif (/^(\d+)-(\d*)$/) {
421			($l, $h) = ($1, ($2 ne "" \|\| $2 >= $length) ? $2 : $length - 1);
422			} else {
423			($l, $h) = (0, $length - 1);
424			goto ignore;
425			}
426			goto satisfiable if $l >= 0 && $l < $length && $h >= 0 && $h > $l;
427			}
428			$hdr->{"Content-Range"} = "bytes */$length";
429			$self->err(416, "not satisfiable", $hdr);
430
431			satisfiable:
432	root	1.4	# check for segmented downloads
433	root	1.10	if ($l && $::NO_SEGMENTED) {
434	root	1.13	if (%{$uri{$self->{remote_addr}}{$self->{uri}}} > 1) {
435	root	1.14	Coro::Event::do_timer(after => 15);
436
437	root	1.4	$self->err(400, "segmented downloads are not allowed");
438			}
439			}
440
441	root	1.1	$hdr->{"Content-Range"} = "bytes $l-$h/$length";
442			@code = (206, "partial content");
443			$length = $h - $l + 1;
444
445			ignore:
446			} else {
447			($l, $h) = (0, $length - 1);
448			}
449
450	root	1.9	$self->{path} =~ /\.([^.]+)$/;
451			$hdr->{"Content-Type"} = $mimetype{lc $1} \|\| "application/octet-stream";
452	root	1.1	$hdr->{"Content-Length"} = $length;
453
454	root	1.4	$self->response(@code, $hdr, "");
455	root	1.1
456			if ($self->{method} eq "GET") {
457	root	1.16	my ($fh, $buf, $r);
458			my $current = $Coro::current;
459	root	1.1	open $fh, "<", $self->{path}
460			or die "$self->{path}: late open failure ($!)";
461
462			$h -= $l - 1;
463
464			while ($h > 0) {
465	root	1.16	aio_read($fh, $l, ($h > $::BUFSIZE ? $::BUFSIZE : $h),
466			$buf, 0, sub {
467			$r = $_[0];
468			$current->ready;
469			});
470			&Coro::schedule;
471			last unless $r;
472	root	1.11	my $w = $self->{fh}->syswrite($buf)
473	root	1.1	or last;
474	root	1.11	$::written += $w;
475			$self->{written} += $w;
476	root	1.16	$l += $r;
477	root	1.1	}
478			}
479
480			close $fh;
481	root	1.7	}
482
483	root	1.2	1;