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#!/usr/bin/perl |
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|
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# this is a relatively small web-server, using coroutines for connections. |
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# play around with it but do not use it in production without checking it |
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# works for you. ask myhttpd@plan9.de in case of problems, or if you are |
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# interested in a newer version (more useless features). |
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|
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use Coro; |
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use Coro::Semaphore; |
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use Coro::Event; |
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use Coro::Socket; |
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|
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no utf8; |
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use bytes; |
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|
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# at least on my machine, this thingy serves files |
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# quite a bit faster than apache, ;) |
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# and quite a bit slower than thttpd :( |
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|
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$MAX_CONNECTS = 500; # maximum simult. connects |
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$REQ_TIMEOUT = 60; # request timeout |
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$RES_TIMEOUT = 180; # response timeout |
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$MAX_POOL = 20; # max. number of idle workers |
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$DOCROOT = "/usr/www/htdocs"; # document root |
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$INDEXPROG = "/usr/www/bin/dols"; # indexing program (nph-cgi script) |
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$SERVER_HOST = "0.0.0.0"; # host to bind on |
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$SERVER_PORT = 80; # port to listen on |
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|
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my $port = new Coro::Socket |
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LocalAddr => $SERVER_HOST, |
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LocalPort => $SERVER_PORT, |
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ReuseAddr => 1, |
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Listen => 1, |
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or die "unable to start server"; |
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|
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$SIG{PIPE} = 'IGNORE'; |
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|
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sub slog { |
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my $level = shift; |
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my $format = shift; |
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#printf "---: $format\n", @_; |
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} |
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|
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my $connections = new Coro::Semaphore $MAX_CONNECTS; |
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|
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my @fh; |
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my @pool; |
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|
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sub handler { |
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while () { |
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my $fh = pop @fh; |
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if ($fh) { |
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eval { |
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conn->new($fh)->handle; |
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}; |
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close $fh; |
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slog 1, "$@" if $@ && !ref $@; |
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$connections->up; |
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} else { |
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last if @pool >= $MAX_POOL; |
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push @pool, $Coro::current; |
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schedule; |
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} |
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} |
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} |
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|
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# move the event main loop into a coroutine |
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async { loop }; |
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|
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slog 1, "accepting connections"; |
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while () { |
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$connections->down; |
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push @fh, $port->accept; |
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#slog 3, "accepted @$connections ".scalar(@pool); |
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if (@pool) { |
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(pop @pool)->ready; |
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} else { |
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async \&handler; |
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} |
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|
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} |
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|
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package conn; |
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|
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use Socket; |
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use HTTP::Date; |
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|
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sub new { |
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my $class = shift; |
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my $fh = shift; |
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my (undef, $iaddr) = unpack_sockaddr_in $fh->peername |
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or $self->err(500, "unable to get peername"); |
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$self->{remote_address} = inet_ntoa $iaddr; |
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bless { fh => $fh }, $class; |
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} |
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|
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sub slog { |
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main::slog(@_); |
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} |
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|
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sub print_response { |
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my ($self, $code, $msg, $hdr, $content) = @_; |
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my $res = "HTTP/1.0 $code $msg\015\012"; |
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|
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$hdr->{Date} = time2str time; # slow? nah. |
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|
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while (my ($h, $v) = each %$hdr) { |
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$res .= "$h: $v\015\012" |
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} |
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$res .= "\015\012$content" if defined $content; |
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|
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print {$self->{fh}} $res; |
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} |
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|
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sub err { |
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my $self = shift; |
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my ($code, $msg, $hdr, $content) = @_; |
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|
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unless (defined $content) { |
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$content = "$code $msg"; |
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$hdr->{"Content-Type"} = "text/plain"; |
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$hdr->{"Content-Length"} = length $content; |
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} |
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|
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$self->slog($msg) if $code; |
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|
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$self->print_response($code, $msg, $hdr, $content); |
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|
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die bless {}, err::; |
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} |
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|
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sub handle { |
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my $self = shift; |
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my $fh = $self->{fh}; |
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|
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#while() { |
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$self->{h} = {}; |
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|
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# read request and parse first line |
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$fh->timeout($::REQ_TIMEOUT); |
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my $req = $fh->readline("\015\012\015\012"); |
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$fh->timeout($::RES_TIMEOUT); |
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|
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defined $req or |
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$self->err(408, "request timeout"); |
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|
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$req =~ /^(?:\015\012)? |
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(GET|HEAD) \040+ |
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([^\040]+) \040+ |
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HTTP\/([0-9]+\.[0-9]+) |
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\015\012/gx |
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or $self->err(403, "method not allowed", { Allow => "GET,HEAD" }); |
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|
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$2 < 2 |
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or $self->err(506, "http protocol version not supported"); |
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|
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$self->{method} = $1; |
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$self->{uri} = $2; |
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|
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# parse headers |
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{ |
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my (%hdr, $h, $v); |
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|
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$hdr{lc $1} .= ",$2" |
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while $req =~ /\G |
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([^:\000-\040]+): |
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[\011\040]* |
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((?: [^\015\012]+ | \015\012[\011\040] )*) |
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\015\012 |
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/gxc; |
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|
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$req =~ /\G\015\012$/ |
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or $self->err(400, "bad request"); |
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|
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$self->{h}{$h} = substr $v, 1 |
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while ($h, $v) = each %hdr; |
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} |
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|
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$self->{server_port} = $self->{h}{host} =~ s/:([0-9]+)$// ? $1 : 80; |
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|
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$self->map_uri; |
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$self->respond; |
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#} |
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} |
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|
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# uri => path mapping |
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sub map_uri { |
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my $self = shift; |
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my $host = $self->{h}{host} || "default"; |
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my $uri = $self->{uri}; |
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|
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# some massaging, also makes it more secure |
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$uri =~ s/%([0-9a-fA-F][0-9a-fA-F])/chr hex $1/ge; |
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$uri =~ s%//+%/%g; |
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$uri =~ s%/\.(?=/|$)%%g; |
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1 while $uri =~ s%/[^/]+/\.\.(?=/|$)%%; |
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|
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$uri =~ m%^/?\.\.(?=/|$)% |
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and $self->err(400, "bad request"); |
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|
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$self->{name} = $uri; |
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|
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# now do the path mapping |
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$self->{path} = "$::DOCROOT/$host$uri"; |
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} |
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|
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sub server_address { |
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my $self = shift; |
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my ($port, $iaddr) = unpack_sockaddr_in $self->{fh}->sockname |
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or $self->err(500, "unable to get socket name"); |
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((inet_ntoa $iaddr), $port); |
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} |
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|
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sub server_host { |
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my $self = shift; |
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if (exists $self->{h}{host}) { |
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return $self->{h}{host}; |
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} else { |
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return (($self->server_address)[0]); |
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} |
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} |
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|
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sub server_hostport { |
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my $self = shift; |
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my ($host, $port); |
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if (exists $self->{h}{host}) { |
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($host, $port) = ($self->{h}{host}, $self->{server_port}); |
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} else { |
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($host, $port) = $self->server_address; |
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} |
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$port = $port == 80 ? "" : ":$port"; |
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$host.$port; |
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} |
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|
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# no, this doesn't do cgi, but it's close enough |
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# for the no-longer-used directory indexing script. |
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sub _cgi { |
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my $self = shift; |
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my $path = shift; |
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my $fh; |
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|
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# no two-way xxx supported |
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if (0 == fork) { |
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open STDOUT, ">&".fileno($self->{fh}); |
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if (chdir $::DOCROOT) { |
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$ENV{SERVER_SOFTWARE} = "thttpd-myhttpd"; # we are thttpd-alike |
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$ENV{HTTP_HOST} = $self->server_host; |
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$ENV{HTTP_PORT} = $self->{server_host}; |
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$ENV{SCRIPT_NAME} = $self->{name}; |
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exec $::INDEXPROG; |
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} |
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Coro::State::_exit(0); |
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} else { |
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} |
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} |
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|
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sub respond { |
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my $self = shift; |
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my $path = $self->{path}; |
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|
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stat $path |
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or $self->err(404, "not found"); |
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|
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# idiotic netscape sends idiotic headers AGAIN |
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my $ims = $self->{h}{"if-modified-since"} =~ /^([^;]+)/ |
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? str2time $1 : 0; |
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|
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if (-d _ && -r _) { |
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# directory |
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if ($path !~ /\/$/) { |
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# create a redirect to get the trailing "/" |
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my $host = $self->server_hostport; |
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$self->err(301, "moved permanently", { Location => "http://$host$self->{uri}/" }); |
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} else { |
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$ims < (stat _)[9] |
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or $self->err(304, "not modified"); |
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|
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if ($self->{method} eq "GET") { |
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if (-r "$path/index.html") { |
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$self->{path} .= "/index.html"; |
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$self->handle_file; |
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} else { |
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$self->handle_dir; |
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} |
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} |
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} |
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} elsif (-f _ && -r _) { |
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-x _ and $self->err(403, "forbidden"); |
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$self->handle_file; |
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} else { |
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$self->err(404, "not found"); |
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} |
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} |
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|
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sub handle_dir { |
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my $self = shift; |
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$self->_cgi($::INDEXPROG); |
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} |
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|
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sub handle_file { |
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my $self = shift; |
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my $length = -s _; |
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my $hdr = { |
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"Last-Modified" => time2str ((stat _)[9]), |
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}; |
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|
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my @code = (200, "ok"); |
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my ($l, $h); |
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|
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if ($self->{h}{range} =~ /^bytes=(.*)$/) { |
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for (split /,/, $1) { |
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if (/^-(\d+)$/) { |
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($l, $h) = ($length - $1, $length - 1); |
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} elsif (/^(\d+)-(\d*)$/) { |
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($l, $h) = ($1, ($2 ne "" || $2 >= $length) ? $2 : $length - 1); |
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} else { |
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($l, $h) = (0, $length - 1); |
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goto ignore; |
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} |
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goto satisfiable if $l >= 0 && $l < $length && $h >= 0 && $h >= $l; |
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} |
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$hdr->{"Content-Range"} = "bytes */$length"; |
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$self->err(416, "not satisfiable", $hdr); |
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|
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satisfiable: |
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$hdr->{"Content-Range"} = "bytes $l-$h/$length"; |
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@code = (206, "partial content"); |
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$length = $h - $l + 1; |
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|
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ignore: |
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} else { |
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($l, $h) = (0, $length - 1); |
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} |
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|
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if ($self->{path} =~ /\.html$/) { |
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$hdr->{"Content-Type"} = "text/html"; |
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} else { |
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$hdr->{"Content-Type"} = "application/octet-stream"; |
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} |
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|
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$hdr->{"Content-Length"} = $length; |
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|
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$self->print_response(@code, $hdr, ""); |
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|
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if ($self->{method} eq "GET") { |
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my ($fh, $buf); |
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open $fh, "<", $self->{path} |
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or die "$self->{path}: late open failure ($!)"; |
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|
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if ($l) { |
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sysseek $fh, $l, 0 |
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or die "$self->{path}: cannot seek to $l ($!)"; |
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} |
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|
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$h -= $l - 1; |
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|
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while ($h > 0) { |
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$h -= sysread $fh, $buf, $h > 4096 ? 4096 : $h; |
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print {$self->{fh}} $buf |
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or last; |
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} |
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} |
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|
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close $fh; |
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} |
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|
