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 );

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--;

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

# end of connection
sub eoconn {
   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 => 20*rand);

   $self->err(401, "too many connections",
              {
                 "Content-Type" => "text/html",
                 "Retry-After" => $::BLOCKTIME,
                 "Warning" => "Please do NOT retry, you have been blocked",
                 "WWW-Authenticate" => "Basic realm=\"Please do NOT retry, you have been blocked\"",
              },
              <<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 =~ /^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;

      $self->eoconn;

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

      $self->slog(9, "persistent connection [".$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";
      $self->slog(9, "not satisfiable($self->{h}{range}|".$self->{h}{"user-agent"}.")");
      $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;

      if (0) {
         if ($l) {
            sysseek $fh, $l, 0;
         }
      }

      while ($h > 0) {
         if (0) {
            sysread $fh, $buf, $h > $::BUFSIZE ? $::BUFSIZE : $h
               or last;
         } else {
            aio_read($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:	1.20
Committed:	Thu Aug 16 21:55:35 2001 UTC (22 years, 10 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.19:	+6 -3 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	root	1.3	our %conn; # $conn{ip}{fh} => connobj
84			our %blocked;
85	root	1.9	our %mimetype;
86
87			sub read_mimetypes {
88			local *M;
89	root	1.10	if (open M, "<mime_types") {
90	root	1.9	while (<M>) {
91			if (/^([^#]\S+)\t+(\S+)$/) {
92			$mimetype{lc $1} = $2;
93			}
94			}
95			} else {
96	root	1.10	print "cannot open mime_types\n";
97	root	1.9	}
98			}
99	root	1.1
100	root	1.10	read_mimetypes;
101
102	root	1.1	sub new {
103			my $class = shift;
104	root	1.6	my $peername = shift;
105	root	1.1	my $fh = shift;
106	root	1.2	my $self = bless { fh => $fh }, $class;
107	root	1.6	my (undef, $iaddr) = unpack_sockaddr_in $peername
108			or $self->err(500, "unable to decode peername");
109	root	1.7
110	root	1.3	$self->{remote_addr} = inet_ntoa $iaddr;
111	root	1.11	$self->{time} = $::NOW;
112	root	1.2
113			# enter ourselves into various lists
114	root	1.3	weaken ($conn{$self->{remote_addr}}{$self*1} = $self);
115
116	root	1.13	$::conns++;
117
118	root	1.2	$self;
119			}
120
121			sub DESTROY {
122			my $self = shift;
123	root	1.13
124			$::conns--;
125
126	root	1.19	$self->eoconn;
127	root	1.3	delete $conn{$self->{remote_addr}}{$self*1};
128	root	1.19	}
129
130			# end of connection
131			sub eoconn {
132	root	1.13	delete $uri{$self->{remote_addr}}{$self->{uri}}{$self*1};
133	root	1.1	}
134
135			sub slog {
136	root	1.4	my $self = shift;
137			main::slog($_[0], "$self->{remote_addr}> $_[1]");
138	root	1.1	}
139
140	root	1.4	sub response {
141	root	1.1	my ($self, $code, $msg, $hdr, $content) = @_;
142	root	1.17	my $res = "HTTP/1.1 $code $msg\015\012";
143	root	1.1
144	root	1.17	#$res .= "Connection: close\015\012";
145	root	1.4	$res .= "Date: ".(time2str $::NOW)."\015\012"; # slow? nah. :(
146	root	1.1
147			while (my ($h, $v) = each %$hdr) {
148			$res .= "$h: $v\015\012"
149			}
150	root	1.10	$res .= "\015\012";
151	root	1.4
152	root	1.13	$res .= $content if defined $content and $self->{method} ne "HEAD";
153	root	1.1
154	root	1.3	print STDERR "$self->{remote_addr} \"$self->{uri}\" $code ".$hdr->{"Content-Length"}." \"$self->{h}{referer}\"\n";#d#
155	root	1.2
156	root	1.11	$self->{written} +=
157			print {$self->{fh}} $res;
158	root	1.1	}
159
160			sub err {
161			my $self = shift;
162			my ($code, $msg, $hdr, $content) = @_;
163
164			unless (defined $content) {
165			$content = "$code $msg";
166			$hdr->{"Content-Type"} = "text/plain";
167			$hdr->{"Content-Length"} = length $content;
168			}
169	root	1.17	$hdr->{"Connection"} = "close";
170	root	1.1
171	root	1.4	$self->response($code, $msg, $hdr, $content);
172	root	1.1
173			die bless {}, err::;
174			}
175
176	root	1.3	sub err_blocked {
177			my $self = shift;
178			my $ip = $self->{remote_addr};
179			my $time = time2str $blocked{$ip} = $::NOW + $::BLOCKTIME;
180	root	1.10
181	root	1.20	Coro::Event::do_timer(after => 20*rand);
182	root	1.14
183			$self->err(401, "too many connections",
184	root	1.4	{
185			"Content-Type" => "text/html",
186	root	1.20	"Retry-After" => $::BLOCKTIME,
187			"Warning" => "Please do NOT retry, you have been blocked",
188			"WWW-Authenticate" => "Basic realm=\"Please do NOT retry, you have been blocked\"",
189	root	1.4	},
190	root	1.3	<<EOF);
191	root	1.4	<html><p>
192	root	1.3	You have been blocked because you opened too many connections. You
193	root	1.4	may retry at</p>
194
195			<p><blockquote>$time.</blockquote></p>
196
197			<p>Until then, each new access will renew the block. You might want to have a
198			look at the <a href="http://www.goof.com/pcg/marc/animefaq.html">FAQ</a>.</p>
199			</html>
200	root	1.3	EOF
201			}
202
203	root	1.1	sub handle {
204			my $self = shift;
205			my $fh = $self->{fh};
206
207	root	1.17	$fh->timeout($::REQ_TIMEOUT);
208			while() {
209			$self->{reqs}++;
210	root	1.1
211			# read request and parse first line
212			my $req = $fh->readline("\015\012\015\012");
213
214	root	1.17	unless (defined $req) {
215			if (exists $self->{version}) {
216			last;
217			} else {
218			$self->err(408, "request timeout");
219			}
220			}
221
222			$self->{h} = {};
223	root	1.1
224	root	1.17	$fh->timeout($::RES_TIMEOUT);
225	root	1.3	my $ip = $self->{remote_addr};
226
227			if ($blocked{$ip}) {
228			$self->err_blocked($blocked{$ip})
229			if $blocked{$ip} > $::NOW;
230
231			delete $blocked{$ip};
232			}
233
234			if (%{$conn{$ip}} > $::MAX_CONN_IP) {
235	root	1.12	$self->slog(2, "blocked ip $ip");
236	root	1.3	$self->err_blocked;
237			}
238
239	root	1.1	$req =~ /^(?:\015\012)?
240			(GET\|HEAD) \040+
241			([^\040]+) \040+
242			HTTP\/([0-9]+\.[0-9]+)
243			\015\012/gx
244	root	1.14	or $self->err(405, "method not allowed", { Allow => "GET,HEAD" });
245	root	1.1
246			$self->{method} = $1;
247			$self->{uri} = $2;
248	root	1.17	$self->{version} = $3;
249
250	root	1.20	$3 =~ /^1\./
251	root	1.17	or $self->err(506, "http protocol version $3 not supported");
252	root	1.1
253			# parse headers
254			{
255			my (%hdr, $h, $v);
256
257			$hdr{lc $1} .= ",$2"
258			while $req =~ /\G
259			([^:\000-\040]+):
260			[\008\040]*
261			((?: [^\015\012]+ \| \015\012[\008\040] )*)
262			\015\012
263			/gxc;
264
265			$req =~ /\G\015\012$/
266			or $self->err(400, "bad request");
267
268			$self->{h}{$h} = substr $v, 1
269			while ($h, $v) = each %hdr;
270			}
271
272			$self->{server_port} = $self->{h}{host} =~ s/:([0-9]+)$// ? $1 : 80;
273	root	1.3
274	root	1.13	weaken ($uri{$self->{remote_addr}}{$self->{uri}}{$self*1} = $self);
275	root	1.1
276			$self->map_uri;
277			$self->respond;
278	root	1.17
279	root	1.19	$self->eoconn;
280
281	root	1.17	last if $self->{h}{connection} =~ /close/ \|\| $self->{version} lt "1.1";
282
283	root	1.19	$self->slog(9, "persistent connection [".$self->{h}{"user-agent"}."][$self->{reqs}]");
284	root	1.17	$fh->timeout($::PER_TIMEOUT);
285			}
286	root	1.1	}
287
288			# uri => path mapping
289			sub map_uri {
290			my $self = shift;
291			my $host = $self->{h}{host} \|\| "default";
292			my $uri = $self->{uri};
293
294			# some massaging, also makes it more secure
295			$uri =~ s/%([0-9a-fA-F][0-9a-fA-F])/chr hex $1/ge;
296			$uri =~ s%//+%/%g;
297			$uri =~ s%/\.(?=/\|$)%%g;
298			1 while $uri =~ s%/[^/]+/\.\.(?=/\|$)%%;
299
300			$uri =~ m%^/?\.\.(?=/\|$)%
301			and $self->err(400, "bad request");
302
303			$self->{name} = $uri;
304
305			# now do the path mapping
306			$self->{path} = "$::DOCROOT/$host$uri";
307	root	1.7
308			$self->access_check;
309	root	1.1	}
310
311			sub server_address {
312			my $self = shift;
313			my ($port, $iaddr) = unpack_sockaddr_in $self->{fh}->getsockname
314			or $self->err(500, "unable to get socket name");
315			((inet_ntoa $iaddr), $port);
316			}
317
318			sub server_host {
319			my $self = shift;
320			if (exists $self->{h}{host}) {
321			return $self->{h}{host};
322			} else {
323			return (($self->server_address)[0]);
324			}
325			}
326
327			sub server_hostport {
328			my $self = shift;
329			my ($host, $port);
330			if (exists $self->{h}{host}) {
331			($host, $port) = ($self->{h}{host}, $self->{server_port});
332			} else {
333			($host, $port) = $self->server_address;
334			}
335			$port = $port == 80 ? "" : ":$port";
336			$host.$port;
337			}
338
339			sub _cgi {
340			my $self = shift;
341			my $path = shift;
342			my $fh;
343
344			# no two-way xxx supported
345			if (0 == fork) {
346			open STDOUT, ">&".fileno($self->{fh});
347			if (chdir $::DOCROOT) {
348			$ENV{SERVER_SOFTWARE} = "thttpd-myhttpd"; # we are thttpd-alike
349			$ENV{HTTP_HOST} = $self->server_host;
350			$ENV{HTTP_PORT} = $self->{server_host};
351			$ENV{SCRIPT_NAME} = $self->{name};
352	root	1.10	exec $path;
353	root	1.1	}
354			Coro::State::_exit(0);
355			} else {
356			}
357			}
358
359			sub respond {
360			my $self = shift;
361			my $path = $self->{path};
362
363			stat $path
364			or $self->err(404, "not found");
365
366	root	1.10	$self->{stat} = [stat _];
367
368	root	1.1	# idiotic netscape sends idiotic headers AGAIN
369			my $ims = $self->{h}{"if-modified-since"} =~ /^([^;]+)/
370			? str2time $1 : 0;
371
372			if (-d _ && -r _) {
373			# directory
374			if ($path !~ /\/$/) {
375			# create a redirect to get the trailing "/"
376			my $host = $self->server_hostport;
377			$self->err(301, "moved permanently", { Location => "http://$host$self->{uri}/" });
378			} else {
379	root	1.10	$ims < $self->{stat}[9]
380	root	1.1	or $self->err(304, "not modified");
381
382			if ($self->{method} eq "GET") {
383			if (-r "$path/index.html") {
384			$self->{path} .= "/index.html";
385			$self->handle_file;
386			} else {
387			$self->handle_dir;
388			}
389			}
390			}
391			} elsif (-f _ && -r _) {
392			-x _ and $self->err(403, "forbidden");
393			$self->handle_file;
394			} else {
395			$self->err(404, "not found");
396			}
397			}
398
399			sub handle_dir {
400			my $self = shift;
401	root	1.10	my $idx = $self->diridx;
402
403			$self->response(200, "ok",
404			{
405			"Content-Type" => "text/html",
406			"Content-Length" => length $idx,
407			},
408			$idx);
409	root	1.1	}
410
411			sub handle_file {
412			my $self = shift;
413			my $length = -s _;
414			my $hdr = {
415			"Last-Modified" => time2str ((stat _)[9]),
416			};
417
418			my @code = (200, "ok");
419			my ($l, $h);
420
421			if ($self->{h}{range} =~ /^bytes=(.*)$/) {
422			for (split /,/, $1) {
423			if (/^-(\d+)$/) {
424			($l, $h) = ($length - $1, $length - 1);
425			} elsif (/^(\d+)-(\d*)$/) {
426			($l, $h) = ($1, ($2 ne "" \|\| $2 >= $length) ? $2 : $length - 1);
427			} else {
428			($l, $h) = (0, $length - 1);
429			goto ignore;
430			}
431			goto satisfiable if $l >= 0 && $l < $length && $h >= 0 && $h > $l;
432			}
433			$hdr->{"Content-Range"} = "bytes */$length";
434	root	1.20	$self->slog(9, "not satisfiable($self->{h}{range}\|".$self->{h}{"user-agent"}.")");
435	root	1.1	$self->err(416, "not satisfiable", $hdr);
436
437			satisfiable:
438	root	1.4	# check for segmented downloads
439	root	1.10	if ($l && $::NO_SEGMENTED) {
440	root	1.13	if (%{$uri{$self->{remote_addr}}{$self->{uri}}} > 1) {
441	root	1.14	Coro::Event::do_timer(after => 15);
442
443	root	1.4	$self->err(400, "segmented downloads are not allowed");
444			}
445			}
446
447	root	1.1	$hdr->{"Content-Range"} = "bytes $l-$h/$length";
448			@code = (206, "partial content");
449			$length = $h - $l + 1;
450
451			ignore:
452			} else {
453			($l, $h) = (0, $length - 1);
454			}
455
456	root	1.9	$self->{path} =~ /\.([^.]+)$/;
457			$hdr->{"Content-Type"} = $mimetype{lc $1} \|\| "application/octet-stream";
458	root	1.1	$hdr->{"Content-Length"} = $length;
459
460	root	1.4	$self->response(@code, $hdr, "");
461	root	1.1
462			if ($self->{method} eq "GET") {
463	root	1.16	my ($fh, $buf, $r);
464			my $current = $Coro::current;
465	root	1.1	open $fh, "<", $self->{path}
466			or die "$self->{path}: late open failure ($!)";
467
468			$h -= $l - 1;
469
470	root	1.19	if (0) {
471			if ($l) {
472			sysseek $fh, $l, 0;
473			}
474			}
475
476	root	1.1	while ($h > 0) {
477	root	1.19	if (0) {
478			sysread $fh, $buf, $h > $::BUFSIZE ? $::BUFSIZE : $h
479			or last;
480			} else {
481			aio_read($fh, $l, ($h > $::BUFSIZE ? $::BUFSIZE : $h),
482			$buf, 0, sub {
483			$r = $_[0];
484			$current->ready;
485			});
486			&Coro::schedule;
487			last unless $r;
488			}
489	root	1.11	my $w = $self->{fh}->syswrite($buf)
490	root	1.1	or last;
491	root	1.11	$::written += $w;
492			$self->{written} += $w;
493	root	1.16	$l += $r;
494	root	1.1	}
495			}
496
497			close $fh;
498	root	1.7	}
499
500	root	1.2	1;