[ViewVC] Annotation of: cvs/Coro/eg/myhttpd

#!/usr/bin/perl

# this is a relatively small web-server, using coroutines
# for connections. play around with it but do not use
# it in production. ask myhttpd@plan9.de for a better
# version that's more usable and bugfixed.

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 :(

$MAX_CONNECTS = 500;                    # maximum simult. connects
$REQ_TIMEOUT  =  60;                    # request timeout
$RES_TIMEOUT  = 180;                    # response timeout
$MAX_POOL     =  20;                    # max. number of idle workers
$DOCROOT      = "/usr/www/htdocs";      # document root
$INDEXPROG    = "/usr/www/bin/dols";    # indexing program (nph-cgi script)
$SERVER_HOST  = "0.0.0.0";              # host to bind on
$SERVER_PORT  = 80;                     # port to listen on

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

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

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

my @fh;
my @pool;

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

async {
   slog 1, "accepting connections";
   while () {
      $connections->down;
      push @fh, $port->accept;
      #slog 3, "accepted @$connections ".scalar(@pool);
      if (@pool) {
         (pop @pool)->ready;
      } else {
         async \&handler;
      }

   }
};

loop;
print "ende\n";#d#

package conn;

use Socket;
use HTTP::Date;

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

sub slog {
   main::slog(@_);
}

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

   $hdr->{Date} = time2str time; # slow? nah.

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

   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;
   }

   $self->slog($msg) if $code;

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

   die bless {}, err::;
}

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");

      $req =~ /^(?:\015\012)?
                (GET|HEAD) \040+
                ([^\040]+) \040+
                HTTP\/([0-9]+\.[0-9]+)
                \015\012/gx
         or $self->err(403, "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;

      $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";
}

sub server_address {
   my $self = shift;
   my ($port, $iaddr) = unpack_sockaddr_in $self->{fh}->sockname
      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;
}

# no, this doesn't do cgi, but it's close enough
# for the no-longer-used directory indexing script.
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 $::INDEXPROG;
      }
      Coro::State::_exit(0);
   } else {
   }
}

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

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

   # 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 < (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;
   $self->_cgi($::INDEXPROG);
}

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

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

   if ($self->{path} =~ /\.html$/) {
      $hdr->{"Content-Type"} = "text/html";
   } else {
      $hdr->{"Content-Type"} = "application/octet-stream";
   }

   $hdr->{"Content-Length"} = $length;

   $self->print_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 > 4096 ? 4096 : $h;
         print {$self->{fh}} $buf
            or last;
      }
   }

   close $fh;
}
Revision:	1.3
Committed:	Fri Sep 14 15:40:56 2001 UTC (22 years, 9 months ago) by root
Branch:	MAIN
Changes since 1.2:	+2 -2 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#!/usr/bin/perl
2
3	root	1.2	# this is a relatively small web-server, using coroutines
4			# for connections. play around with it but do not use
5			# it in production. ask myhttpd@plan9.de for a better
6			# version that's more usable and bugfixed.
7
8	root	1.1	use Coro;
9			use Coro::Semaphore;
10			use Coro::Event;
11			use Coro::Socket;
12
13			no utf8;
14			use bytes;
15
16			# at least on my machine, this thingy serves files
17			# quite a bit faster than apache, ;)
18			# and quite a bit slower than thttpd :(
19
20			$MAX_CONNECTS = 500; # maximum simult. connects
21			$REQ_TIMEOUT = 60; # request timeout
22			$RES_TIMEOUT = 180; # response timeout
23			$MAX_POOL = 20; # max. number of idle workers
24			$DOCROOT = "/usr/www/htdocs"; # document root
25			$INDEXPROG = "/usr/www/bin/dols"; # indexing program (nph-cgi script)
26			$SERVER_HOST = "0.0.0.0"; # host to bind on
27			$SERVER_PORT = 80; # port to listen on
28
29			my $port = new Coro::Socket
30			LocalAddr => $SERVER_HOST,
31			LocalPort => $SERVER_PORT,
32			ReuseAddr => 1,
33			Listen => 1,
34			or die "unable to start server";
35
36			$SIG{PIPE} = 'IGNORE';
37
38			sub slog {
39			my $level = shift;
40			my $format = shift;
41			#printf "---: $format\n", @_;
42			}
43
44			my $connections = new Coro::Semaphore $MAX_CONNECTS;
45
46			my @fh;
47			my @pool;
48
49			sub handler {
50			while () {
51			my $fh = pop @fh;
52			if ($fh) {
53			eval {
54			conn->new($fh)->handle;
55			};
56			close $fh;
57			slog 1, "$@" if $@ && !ref $@;
58			$connections->up;
59			} else {
60			last if @pool >= $MAX_POOL;
61			push @pool, $Coro::current;
62			schedule;
63			}
64			}
65			}
66
67			async {
68			slog 1, "accepting connections";
69			while () {
70			$connections->down;
71			push @fh, $port->accept;
72			#slog 3, "accepted @$connections ".scalar(@pool);
73			if (@pool) {
74			(pop @pool)->ready;
75			} else {
76			async \&handler;
77			}
78
79			}
80			};
81
82			loop;
83			print "ende\n";#d#
84
85			package conn;
86
87			use Socket;
88			use HTTP::Date;
89
90			sub new {
91			my $class = shift;
92			my $fh = shift;
93	root	1.3	my (undef, $iaddr) = unpack_sockaddr_in $fh->peername
94	root	1.1	or $self->err(500, "unable to get peername");
95			$self->{remote_address} = inet_ntoa $iaddr;
96			bless { fh => $fh }, $class;
97			}
98
99			sub slog {
100			main::slog(@_);
101			}
102
103			sub print_response {
104			my ($self, $code, $msg, $hdr, $content) = @_;
105			my $res = "HTTP/1.0 $code $msg\015\012";
106
107			$hdr->{Date} = time2str time; # slow? nah.
108
109			while (my ($h, $v) = each %$hdr) {
110			$res .= "$h: $v\015\012"
111			}
112			$res .= "\015\012$content" if defined $content;
113
114			print {$self->{fh}} $res;
115			}
116
117			sub err {
118			my $self = shift;
119			my ($code, $msg, $hdr, $content) = @_;
120
121			unless (defined $content) {
122			$content = "$code $msg";
123			$hdr->{"Content-Type"} = "text/plain";
124			$hdr->{"Content-Length"} = length $content;
125			}
126
127			$self->slog($msg) if $code;
128
129			$self->print_response($code, $msg, $hdr, $content);
130
131			die bless {}, err::;
132			}
133
134			sub handle {
135			my $self = shift;
136			my $fh = $self->{fh};
137
138			#while() {
139			$self->{h} = {};
140
141			# read request and parse first line
142			$fh->timeout($::REQ_TIMEOUT);
143			my $req = $fh->readline("\015\012\015\012");
144			$fh->timeout($::RES_TIMEOUT);
145
146			defined $req or
147			$self->err(408, "request timeout");
148
149			$req =~ /^(?:\015\012)?
150			(GET\|HEAD) \040+
151			([^\040]+) \040+
152			HTTP\/([0-9]+\.[0-9]+)
153			\015\012/gx
154			or $self->err(403, "method not allowed", { Allow => "GET,HEAD" });
155
156			$2 ne "1.0"
157			or $self->err(506, "http protocol version not supported");
158
159			$self->{method} = $1;
160			$self->{uri} = $2;
161
162			# parse headers
163			{
164			my (%hdr, $h, $v);
165
166			$hdr{lc $1} .= ",$2"
167			while $req =~ /\G
168			([^:\000-\040]+):
169			[\008\040]*
170			((?: [^\015\012]+ \| \015\012[\008\040] )*)
171			\015\012
172			/gxc;
173
174			$req =~ /\G\015\012$/
175			or $self->err(400, "bad request");
176
177			$self->{h}{$h} = substr $v, 1
178			while ($h, $v) = each %hdr;
179			}
180
181			$self->{server_port} = $self->{h}{host} =~ s/:([0-9]+)$// ? $1 : 80;
182
183			$self->map_uri;
184			$self->respond;
185			#}
186			}
187
188			# uri => path mapping
189			sub map_uri {
190			my $self = shift;
191			my $host = $self->{h}{host} \|\| "default";
192			my $uri = $self->{uri};
193
194			# some massaging, also makes it more secure
195			$uri =~ s/%([0-9a-fA-F][0-9a-fA-F])/chr hex $1/ge;
196			$uri =~ s%//+%/%g;
197			$uri =~ s%/\.(?=/\|$)%%g;
198			1 while $uri =~ s%/[^/]+/\.\.(?=/\|$)%%;
199
200			$uri =~ m%^/?\.\.(?=/\|$)%
201			and $self->err(400, "bad request");
202
203			$self->{name} = $uri;
204
205			# now do the path mapping
206			$self->{path} = "$::DOCROOT/$host$uri";
207			}
208
209			sub server_address {
210			my $self = shift;
211	root	1.3	my ($port, $iaddr) = unpack_sockaddr_in $self->{fh}->sockname
212	root	1.1	or $self->err(500, "unable to get socket name");
213			((inet_ntoa $iaddr), $port);
214			}
215
216			sub server_host {
217			my $self = shift;
218			if (exists $self->{h}{host}) {
219			return $self->{h}{host};
220			} else {
221			return (($self->server_address)[0]);
222			}
223			}
224
225			sub server_hostport {
226			my $self = shift;
227			my ($host, $port);
228			if (exists $self->{h}{host}) {
229			($host, $port) = ($self->{h}{host}, $self->{server_port});
230			} else {
231			($host, $port) = $self->server_address;
232			}
233			$port = $port == 80 ? "" : ":$port";
234			$host.$port;
235			}
236
237	root	1.2	# no, this doesn't do cgi, but it's close enough
238			# for the no-longer-used directory indexing script.
239	root	1.1	sub _cgi {
240			my $self = shift;
241			my $path = shift;
242			my $fh;
243
244			# no two-way xxx supported
245			if (0 == fork) {
246			open STDOUT, ">&".fileno($self->{fh});
247			if (chdir $::DOCROOT) {
248			$ENV{SERVER_SOFTWARE} = "thttpd-myhttpd"; # we are thttpd-alike
249			$ENV{HTTP_HOST} = $self->server_host;
250			$ENV{HTTP_PORT} = $self->{server_host};
251			$ENV{SCRIPT_NAME} = $self->{name};
252			exec $::INDEXPROG;
253			}
254			Coro::State::_exit(0);
255			} else {
256			}
257			}
258
259			sub respond {
260			my $self = shift;
261			my $path = $self->{path};
262
263			stat $path
264			or $self->err(404, "not found");
265
266			# idiotic netscape sends idiotic headers AGAIN
267			my $ims = $self->{h}{"if-modified-since"} =~ /^([^;]+)/
268			? str2time $1 : 0;
269
270			if (-d _ && -r _) {
271			# directory
272			if ($path !~ /\/$/) {
273			# create a redirect to get the trailing "/"
274			my $host = $self->server_hostport;
275			$self->err(301, "moved permanently", { Location => "http://$host$self->{uri}/" });
276			} else {
277			$ims < (stat _)[9]
278			or $self->err(304, "not modified");
279
280			if ($self->{method} eq "GET") {
281			if (-r "$path/index.html") {
282			$self->{path} .= "/index.html";
283			$self->handle_file;
284			} else {
285			$self->handle_dir;
286			}
287			}
288			}
289			} elsif (-f _ && -r _) {
290			-x _ and $self->err(403, "forbidden");
291			$self->handle_file;
292			} else {
293			$self->err(404, "not found");
294			}
295			}
296
297			sub handle_dir {
298			my $self = shift;
299			$self->_cgi($::INDEXPROG);
300			}
301
302			sub handle_file {
303			my $self = shift;
304			my $length = -s _;
305			my $hdr = {
306			"Last-Modified" => time2str ((stat _)[9]),
307			};
308
309			my @code = (200, "ok");
310			my ($l, $h);
311
312			if ($self->{h}{range} =~ /^bytes=(.*)$/) {
313			for (split /,/, $1) {
314			if (/^-(\d+)$/) {
315			($l, $h) = ($length - $1, $length - 1);
316			} elsif (/^(\d+)-(\d*)$/) {
317			($l, $h) = ($1, ($2 ne "" \|\| $2 >= $length) ? $2 : $length - 1);
318			} else {
319			($l, $h) = (0, $length - 1);
320			goto ignore;
321			}
322			goto satisfiable if $l >= 0 && $l < $length && $h >= 0 && $h > $l;
323			}
324			$hdr->{"Content-Range"} = "bytes */$length";
325			$self->err(416, "not satisfiable", $hdr);
326
327			satisfiable:
328			$hdr->{"Content-Range"} = "bytes $l-$h/$length";
329			@code = (206, "partial content");
330			$length = $h - $l + 1;
331
332			ignore:
333			} else {
334			($l, $h) = (0, $length - 1);
335			}
336
337			if ($self->{path} =~ /\.html$/) {
338			$hdr->{"Content-Type"} = "text/html";
339			} else {
340			$hdr->{"Content-Type"} = "application/octet-stream";
341			}
342
343			$hdr->{"Content-Length"} = $length;
344
345			$self->print_response(@code, $hdr, "");
346
347			if ($self->{method} eq "GET") {
348			my ($fh, $buf);
349			open $fh, "<", $self->{path}
350			or die "$self->{path}: late open failure ($!)";
351
352			if ($l) {
353			sysseek $fh, $l, 0
354			or die "$self->{path}: cannot seek to $l ($!)";
355			}
356
357			$h -= $l - 1;
358
359			while ($h > 0) {
360			$h -= sysread $fh, $buf, $h > 4096 ? 4096 : $h;
361			print {$self->{fh}} $buf
362			or last;
363			}
364			}
365
366			close $fh;
367			}