| 1 |
#!/usr/bin/perl |
| 2 |
|
| 3 |
# 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 |
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 |
my (undef, $iaddr) = unpack_sockaddr_in $fh->peername |
| 94 |
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 < 2 |
| 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 |
[\010\040]* |
| 170 |
((?: [^\015\012]+ | \015\012[\010\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 $self = shift; |
| 211 |
my ($port, $iaddr) = unpack_sockaddr_in $self->{fh}->sockname |
| 212 |
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 |
# no, this doesn't do cgi, but it's close enough |
| 238 |
# for the no-longer-used directory indexing script. |
| 239 |
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 |
cpen $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 |
} |
