Coro/myhttpd/httpd.pl

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

use HTTP::Date;

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';

our $accesslog;

if ($ACCESS_LOG) {
   use IO::Handle;
   open $accesslog, ">>$ACCESS_LOG"
     or die "$ACCESS_LOG: $!";
   $accesslog->autoflush(1);
}

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

our $connections = new Coro::Semaphore $MAX_CONNECTS || 250;
our $httpevent   = new Coro::Signal;

our $wait_factor = 0.95;

our @transfers = (
  [(new Coro::Semaphore $MAX_TRANSFERS_SMALL || 50), 1],
  [(new Coro::Semaphore $MAX_TRANSFERS_LARGE || 50), 1],
);

my @newcons;
my @pool;

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

sub listen_on {
   my $listen = $_[0];

   push @listen_sockets, $listen;

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

      }
   };
}

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

listen_on $http_port;

if ($SERVER_PORT2) {
   my $http_port = new Coro::Socket
           LocalAddr => $SERVER_HOST,
           LocalPort => $SERVER_PORT2,
           ReuseAddr => 1,
           Listen => 50,
      or die "unable to start server";

   listen_on $http_port;
}

our $NOW;
our $HTTP_NOW;

Event->timer(interval => 1, hard => 1, cb => sub {
   $NOW = time;
   $HTTP_NOW = time2str $NOW;
})->now;

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}{self} => connobj
our %uri;  # $uri{ip}{uri}{self}
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 $fh = shift;
   my $peername = 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;

   $::conns++;

   $self;
}

sub DESTROY {
   my $self = shift;
   $::conns--;
   $self->eoconn;
}

# end of connection
sub eoconn {
   my $self = shift;

   # clean up hints
   delete $conn{$self->{remote_id}}{$self*1};
   delete $uri{$self->{remote_id}}{$self->{uri}}{$self*1};

   $httpevent->broadcast;
}

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

sub response {
   my ($self, $code, $msg, $hdr, $content) = @_;
   my $res = "HTTP/1.1 $code $msg\015\012";

   $self->{h}{connection} = "close"
      if exists $hdr->{Connection} # to avoid "empty" header lines due to vivification
         and $hdr->{Connection} =~ /close/;

   $res .= "Date: $HTTP_NOW\015\012";

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

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

   my $log = "$self->{remote_addr} \"$self->{uri}\" $code ".$hdr->{"Content-Length"}." \"$self->{h}{referer}\"\n";

   print $accesslog $log if $accesslog;
   print STDERR $log;

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

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

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

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

   die bless {}, err::;
}

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

   my $host;

   $fh->timeout($::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);

      $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;
      }

      # remote id should be unique per user
      my $id = $self->{remote_addr};

      if (exists $self->{h}{"client-ip"}) {
         $id .= "[".$self->{h}{"client-ip"}."]";
      } elsif (exists $self->{h}{"x-forwarded-for"}) {
         $id .= "[".$self->{h}{"x-forwarded-for"}."]";
      }

      $self->{remote_id} = $id;

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

         delete $blocked{$id};
      }

      if (%{$conn{$id}} >= $::MAX_CONN_IP) {
         my $delay = $::PER_TIMEOUT + $::NOW + 15;
         while (%{$conn{$id}} >= $::MAX_CONN_IP) {
            if ($delay < $::NOW) {
               $self->slog(2, "blocked ip $id");
               $self->err_blocked;
            } else {
               $httpevent->wait;
            }
         }
      }

      # find out server name and port
      if ($self->{uri} =~ s/^http:\/\/([^\/?#]*)//i) {
         $host = $1;
      } else {
         $host = $self->{h}{host};
      }

      if (defined $host) {
         $self->{server_port} = $host =~ s/:([0-9]+)$// ? $1 : 80;
      } else {
         ($self->{server_port}, $host)
            = unpack_sockaddr_in $self->{fh}->sockname
               or $self->err(500, "unable to get socket name");
         $host = inet_ntoa $host;
      }

      $self->{server_name} = $host;

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

      eval {
         $self->map_uri;
         $self->respond;
      };

      $self->eoconn;

      die if $@ && !ref $@;

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

      $httpevent->broadcast;

      $fh->timeout($::PER_TIMEOUT);
   }
}

# uri => path mapping
sub map_uri {
   my $self = shift;
   my $host = $self->{server_name};
   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 _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_name};
         $ENV{HTTP_PORT}       = $self->{server_port};
         $ENV{SCRIPT_NAME}     = $self->{name};
         exec $path;
      }
      Coro::State::_exit(0);
   } else {
      die;
   }
}

sub server_hostport {
   $_[0]{server_port} == 80
      ? $_[0]{server_name}
      : "$_[0]{server_name}:$_[0]{server_port}";
}

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 "/"
         # we don't try to avoid the :80
         $self->err(301, "moved permanently", { Location =>  "http://".$self->server_hostport."$self->{uri}/" });
      } else {
         $ims < $self->{stat}[9]
            or $self->err(304, "not modified");

         if (-r "$path/index.html") {
            # replace directory "size" by index.html filesize
            $self->{stat}[7] = (stat ($self->{path} .= "/index.html"))[7];
            $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 = $self->{stat}[7];
   my $queue = $::transfers[$length >= $::TRANSFER_SMALL];
   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";
      $hdr->{"Content-Length"} = $length;
      $self->err(416, "not satisfiable", $hdr, "");

satisfiable:
      # check for segmented downloads
      if ($l && $::NO_SEGMENTED) {
         my $delay = $::NOW + $::PER_TIMEOUT + 15;
         while (%{$uri{$self->{remote_id}}{$self->{uri}}} > 1) {
            if ($delay <= $::NOW) {
               $self->err_segmented_download;
            } else {
               $httpevent->broadcast;
            }
         }
      }

      $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") {
      $self->{time} = $::NOW;

      my $fudge = $queue->[0]->waiters;
      $fudge = $fudge ? ($fudge+1)/$fudge : 1;

      $queue->[1] *= $fudge;
      my $transfer = $queue->[0]->guard;

      if ($fudge != 1) {
         $queue->[1] /= $fudge;
         $queue->[1] = $queue->[1] * $::wait_factor
                     + ($::NOW - $self->{time}) * (1 - $::wait_factor);
      }
      $self->{time} = $::NOW;

      $self->{fh}->writable or return;

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

      close $fh;
   }
}

1;
Revision:	1.45
Committed:	Sun Nov 11 03:32:19 2001 UTC (22 years, 8 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.44:	+5 -2 lines
Log Message:	* empty log message *
#	Content
1	use Coro;
2	use Coro::Semaphore;
3	use Coro::Event;
4	use Coro::Socket;
5	use Coro::Signal;
6
7	use HTTP::Date;
8
9	no utf8;
10	use bytes;
11
12	# at least on my machine, this thingy serves files
13	# quite a bit faster than apache, ;)
14	# and quite a bit slower than thttpd :(
15
16	$SIG{PIPE} = 'IGNORE';
17
18	our $accesslog;
19
20	if ($ACCESS_LOG) {
21	use IO::Handle;
22	open $accesslog, ">>$ACCESS_LOG"
23	or die "$ACCESS_LOG: $!";
24	$accesslog->autoflush(1);
25	}
26
27	sub slog {
28	my $level = shift;
29	my $format = shift;
30	printf "---: $format\n", @_;
31	}
32
33	our $connections = new Coro::Semaphore $MAX_CONNECTS \|\| 250;
34	our $httpevent = new Coro::Signal;
35
36	our $wait_factor = 0.95;
37
38	our @transfers = (
39	[(new Coro::Semaphore $MAX_TRANSFERS_SMALL \|\| 50), 1],
40	[(new Coro::Semaphore $MAX_TRANSFERS_LARGE \|\| 50), 1],
41	);
42
43	my @newcons;
44	my @pool;
45
46	# one "execution thread"
47	sub handler {
48	while () {
49	if (@newcons) {
50	eval {
51	conn->new(@{pop @newcons})->handle;
52	};
53	slog 1, "$@" if $@ && !ref $@;
54	$connections->up;
55	} else {
56	last if @pool >= $MAX_POOL;
57	push @pool, $Coro::current;
58	schedule;
59	}
60	}
61	}
62
63	sub listen_on {
64	my $listen = $_[0];
65
66	push @listen_sockets, $listen;
67
68	# the "main thread"
69	async {
70	slog 1, "accepting connections";
71	while () {
72	$connections->down;
73	push @newcons, [$listen->accept];
74	#slog 3, "accepted @$connections ".scalar(@pool);
75	if (@pool) {
76	(pop @pool)->ready;
77	} else {
78	async \&handler;
79	}
80
81	}
82	};
83	}
84
85	my $http_port = new Coro::Socket
86	LocalAddr => $SERVER_HOST,
87	LocalPort => $SERVER_PORT,
88	ReuseAddr => 1,
89	Listen => 50,
90	or die "unable to start server";
91
92	listen_on $http_port;
93
94	if ($SERVER_PORT2) {
95	my $http_port = new Coro::Socket
96	LocalAddr => $SERVER_HOST,
97	LocalPort => $SERVER_PORT2,
98	ReuseAddr => 1,
99	Listen => 50,
100	or die "unable to start server";
101
102	listen_on $http_port;
103	}
104
105	our $NOW;
106	our $HTTP_NOW;
107
108	Event->timer(interval => 1, hard => 1, cb => sub {
109	$NOW = time;
110	$HTTP_NOW = time2str $NOW;
111	})->now;
112
113	package conn;
114
115	use Socket;
116	use HTTP::Date;
117	use Convert::Scalar 'weaken';
118	use Linux::AIO;
119
120	Linux::AIO::min_parallel $::AIO_PARALLEL;
121
122	Event->io(fd => Linux::AIO::poll_fileno,
123	poll => 'r', async => 1,
124	cb => \&Linux::AIO::poll_cb);
125
126	our %conn; # $conn{ip}{self} => connobj
127	our %uri; # $uri{ip}{uri}{self}
128	our %blocked;
129	our %mimetype;
130
131	sub read_mimetypes {
132	local *M;
133	if (open M, "<mime_types") {
134	while (<M>) {
135	if (/^([^#]\S+)\t+(\S+)$/) {
136	$mimetype{lc $1} = $2;
137	}
138	}
139	} else {
140	print "cannot open mime_types\n";
141	}
142	}
143
144	read_mimetypes;
145
146	sub new {
147	my $class = shift;
148	my $fh = shift;
149	my $peername = shift;
150	my $self = bless { fh => $fh }, $class;
151	my (undef, $iaddr) = unpack_sockaddr_in $peername
152	or $self->err(500, "unable to decode peername");
153
154	$self->{remote_addr} = inet_ntoa $iaddr;
155	$self->{time} = $::NOW;
156
157	$::conns++;
158
159	$self;
160	}
161
162	sub DESTROY {
163	my $self = shift;
164	$::conns--;
165	$self->eoconn;
166	}
167
168	# end of connection
169	sub eoconn {
170	my $self = shift;
171
172	# clean up hints
173	delete $conn{$self->{remote_id}}{$self*1};
174	delete $uri{$self->{remote_id}}{$self->{uri}}{$self*1};
175
176	$httpevent->broadcast;
177	}
178
179	sub slog {
180	my $self = shift;
181	main::slog($_[0], ($self->{remote_id} \|\| $self->{remote_addr}) ."> $_[1]");
182	}
183
184	sub response {
185	my ($self, $code, $msg, $hdr, $content) = @_;
186	my $res = "HTTP/1.1 $code $msg\015\012";
187
188	$self->{h}{connection} = "close"
189	if exists $hdr->{Connection} # to avoid "empty" header lines due to vivification
190	and $hdr->{Connection} =~ /close/;
191
192	$res .= "Date: $HTTP_NOW\015\012";
193
194	while (my ($h, $v) = each %$hdr) {
195	$res .= "$h: $v\015\012"
196	}
197	$res .= "\015\012";
198
199	$res .= $content if defined $content and $self->{method} ne "HEAD";
200
201	my $log = "$self->{remote_addr} \"$self->{uri}\" $code ".$hdr->{"Content-Length"}." \"$self->{h}{referer}\"\n";
202
203	print $accesslog $log if $accesslog;
204	print STDERR $log;
205
206	$self->{written} +=
207	print {$self->{fh}} $res;
208	}
209
210	sub err {
211	my $self = shift;
212	my ($code, $msg, $hdr, $content) = @_;
213
214	unless (defined $content) {
215	$content = "$code $msg\n";
216	$hdr->{"Content-Type"} = "text/plain";
217	$hdr->{"Content-Length"} = length $content;
218	}
219	$hdr->{"Connection"} = "close";
220
221	$self->response($code, $msg, $hdr, $content);
222
223	die bless {}, err::;
224	}
225
226	sub handle {
227	my $self = shift;
228	my $fh = $self->{fh};
229
230	my $host;
231
232	$fh->timeout($::REQ_TIMEOUT);
233	while() {
234	$self->{reqs}++;
235
236	# read request and parse first line
237	my $req = $fh->readline("\015\012\015\012");
238
239	unless (defined $req) {
240	if (exists $self->{version}) {
241	last;
242	} else {
243	$self->err(408, "request timeout");
244	}
245	}
246
247	$self->{h} = {};
248
249	$fh->timeout($::RES_TIMEOUT);
250
251	$req =~ /^(?:\015\012)?
252	(GET\|HEAD) \040+
253	([^\040]+) \040+
254	HTTP\/([0-9]+\.[0-9]+)
255	\015\012/gx
256	or $self->err(405, "method not allowed", { Allow => "GET,HEAD" });
257
258	$self->{method} = $1;
259	$self->{uri} = $2;
260	$self->{version} = $3;
261
262	$3 =~ /^1\./
263	or $self->err(506, "http protocol version $3 not supported");
264
265	# parse headers
266	{
267	my (%hdr, $h, $v);
268
269	$hdr{lc $1} .= ",$2"
270	while $req =~ /\G
271	([^:\000-\040]+):
272	[\008\040]*
273	((?: [^\015\012]+ \| \015\012[\008\040] )*)
274	\015\012
275	/gxc;
276
277	$req =~ /\G\015\012$/
278	or $self->err(400, "bad request");
279
280	$self->{h}{$h} = substr $v, 1
281	while ($h, $v) = each %hdr;
282	}
283
284	# remote id should be unique per user
285	my $id = $self->{remote_addr};
286
287	if (exists $self->{h}{"client-ip"}) {
288	$id .= "[".$self->{h}{"client-ip"}."]";
289	} elsif (exists $self->{h}{"x-forwarded-for"}) {
290	$id .= "[".$self->{h}{"x-forwarded-for"}."]";
291	}
292
293	$self->{remote_id} = $id;
294
295	if ($blocked{$id}) {
296	$self->err_blocked($blocked{$id})
297	if $blocked{$id} > $::NOW;
298
299	delete $blocked{$id};
300	}
301
302	if (%{$conn{$id}} >= $::MAX_CONN_IP) {
303	my $delay = $::PER_TIMEOUT + $::NOW + 15;
304	while (%{$conn{$id}} >= $::MAX_CONN_IP) {
305	if ($delay < $::NOW) {
306	$self->slog(2, "blocked ip $id");
307	$self->err_blocked;
308	} else {
309	$httpevent->wait;
310	}
311	}
312	}
313
314	# find out server name and port
315	if ($self->{uri} =~ s/^http:\/\/([^\/?#]*)//i) {
316	$host = $1;
317	} else {
318	$host = $self->{h}{host};
319	}
320
321	if (defined $host) {
322	$self->{server_port} = $host =~ s/:([0-9]+)$// ? $1 : 80;
323	} else {
324	($self->{server_port}, $host)
325	= unpack_sockaddr_in $self->{fh}->sockname
326	or $self->err(500, "unable to get socket name");
327	$host = inet_ntoa $host;
328	}
329
330	$self->{server_name} = $host;
331
332	# enter ourselves into various lists
333	weaken ($conn{$id}{$self*1} = $self);
334	weaken ($uri{$id}{$self->{uri}}{$self*1} = $self);
335
336	eval {
337	$self->map_uri;
338	$self->respond;
339	};
340
341	$self->eoconn;
342
343	die if $@ && !ref $@;
344
345	last if $self->{h}{connection} =~ /close/ \|\| $self->{version} < 1.1;
346
347	$httpevent->broadcast;
348
349	$fh->timeout($::PER_TIMEOUT);
350	}
351	}
352
353	# uri => path mapping
354	sub map_uri {
355	my $self = shift;
356	my $host = $self->{server_name};
357	my $uri = $self->{uri};
358
359	# some massaging, also makes it more secure
360	$uri =~ s/%([0-9a-fA-F][0-9a-fA-F])/chr hex $1/ge;
361	$uri =~ s%//+%/%g;
362	$uri =~ s%/\.(?=/\|$)%%g;
363	1 while $uri =~ s%/[^/]+/\.\.(?=/\|$)%%;
364
365	$uri =~ m%^/?\.\.(?=/\|$)%
366	and $self->err(400, "bad request");
367
368	$self->{name} = $uri;
369
370	# now do the path mapping
371	$self->{path} = "$::DOCROOT/$host$uri";
372
373	$self->access_check;
374	}
375
376	sub _cgi {
377	my $self = shift;
378	my $path = shift;
379	my $fh;
380
381	# no two-way xxx supported
382	if (0 == fork) {
383	open STDOUT, ">&".fileno($self->{fh});
384	if (chdir $::DOCROOT) {
385	$ENV{SERVER_SOFTWARE} = "thttpd-myhttpd"; # we are thttpd-alike
386	$ENV{HTTP_HOST} = $self->{server_name};
387	$ENV{HTTP_PORT} = $self->{server_port};
388	$ENV{SCRIPT_NAME} = $self->{name};
389	exec $path;
390	}
391	Coro::State::_exit(0);
392	} else {
393	die;
394	}
395	}
396
397	sub server_hostport {
398	$_[0]{server_port} == 80
399	? $_[0]{server_name}
400	: "$_[0]{server_name}:$_[0]{server_port}";
401	}
402
403	sub respond {
404	my $self = shift;
405	my $path = $self->{path};
406
407	stat $path
408	or $self->err(404, "not found");
409
410	$self->{stat} = [stat _];
411
412	# idiotic netscape sends idiotic headers AGAIN
413	my $ims = $self->{h}{"if-modified-since"} =~ /^([^;]+)/
414	? str2time $1 : 0;
415
416	if (-d _ && -r _) {
417	# directory
418	if ($path !~ /\/$/) {
419	# create a redirect to get the trailing "/"
420	# we don't try to avoid the :80
421	$self->err(301, "moved permanently", { Location => "http://".$self->server_hostport."$self->{uri}/" });
422	} else {
423	$ims < $self->{stat}[9]
424	or $self->err(304, "not modified");
425
426	if (-r "$path/index.html") {
427	# replace directory "size" by index.html filesize
428	$self->{stat}[7] = (stat ($self->{path} .= "/index.html"))[7];
429	$self->handle_file;
430	} else {
431	$self->handle_dir;
432	}
433	}
434	} elsif (-f _ && -r _) {
435	-x _ and $self->err(403, "forbidden");
436	$self->handle_file;
437	} else {
438	$self->err(404, "not found");
439	}
440	}
441
442	sub handle_dir {
443	my $self = shift;
444	my $idx = $self->diridx;
445
446	$self->response(200, "ok",
447	{
448	"Content-Type" => "text/html",
449	"Content-Length" => length $idx,
450	},
451	$idx);
452	}
453
454	sub handle_file {
455	my $self = shift;
456	my $length = $self->{stat}[7];
457	my $queue = $::transfers[$length >= $::TRANSFER_SMALL];
458	my $hdr = {
459	"Last-Modified" => time2str ((stat _)[9]),
460	};
461
462	my @code = (200, "ok");
463	my ($l, $h);
464
465	if ($self->{h}{range} =~ /^bytes=(.*)$/) {
466	for (split /,/, $1) {
467	if (/^-(\d+)$/) {
468	($l, $h) = ($length - $1, $length - 1);
469	} elsif (/^(\d+)-(\d*)$/) {
470	($l, $h) = ($1, ($2 ne "" \|\| $2 >= $length) ? $2 : $length - 1);
471	} else {
472	($l, $h) = (0, $length - 1);
473	goto ignore;
474	}
475	goto satisfiable if $l >= 0 && $l < $length && $h >= 0 && $h >= $l;
476	}
477	$hdr->{"Content-Range"} = "bytes */$length";
478	$hdr->{"Content-Length"} = $length;
479	$self->err(416, "not satisfiable", $hdr, "");
480
481	satisfiable:
482	# check for segmented downloads
483	if ($l && $::NO_SEGMENTED) {
484	my $delay = $::NOW + $::PER_TIMEOUT + 15;
485	while (%{$uri{$self->{remote_id}}{$self->{uri}}} > 1) {
486	if ($delay <= $::NOW) {
487	$self->err_segmented_download;
488	} else {
489	$httpevent->broadcast;
490	}
491	}
492	}
493
494	$hdr->{"Content-Range"} = "bytes $l-$h/$length";
495	@code = (206, "partial content");
496	$length = $h - $l + 1;
497
498	ignore:
499	} else {
500	($l, $h) = (0, $length - 1);
501	}
502
503	$self->{path} =~ /\.([^.]+)$/;
504	$hdr->{"Content-Type"} = $mimetype{lc $1} \|\| "application/octet-stream";
505	$hdr->{"Content-Length"} = $length;
506
507	$self->response(@code, $hdr, "");
508
509	if ($self->{method} eq "GET") {
510	$self->{time} = $::NOW;
511
512	my $fudge = $queue->[0]->waiters;
513	$fudge = $fudge ? ($fudge+1)/$fudge : 1;
514
515	$queue->[1] *= $fudge;
516	my $transfer = $queue->[0]->guard;
517
518	if ($fudge != 1) {
519	$queue->[1] /= $fudge;
520	$queue->[1] = $queue->[1] * $::wait_factor
521	+ ($::NOW - $self->{time}) * (1 - $::wait_factor);
522	}
523	$self->{time} = $::NOW;
524
525	$self->{fh}->writable or return;
526
527	my ($fh, $buf, $r);
528	my $current = $Coro::current;
529	open $fh, "<", $self->{path}
530	or die "$self->{path}: late open failure ($!)";
531
532	$h -= $l - 1;
533
534	if (0) {
535	if ($l) {
536	sysseek $fh, $l, 0;
537	}
538	}
539
540	while ($h > 0) {
541	if (0) {
542	sysread $fh, $buf, $h > $::BUFSIZE ? $::BUFSIZE : $h
543	or last;
544	} else {
545	aio_read($fh, $l, ($h > $::BUFSIZE ? $::BUFSIZE : $h),
546	$buf, 0, sub {
547	$r = $_[0];
548	Coro::ready($current);
549	});
550	&Coro::schedule;
551	last unless $r;
552	}
553	my $w = syswrite $self->{fh}, $buf
554	or last;
555	$::written += $w;
556	$self->{written} += $w;
557	$l += $r;
558	}
559
560	close $fh;
561	}
562	}
563
564	1;