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package proxy_impl; |
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|
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use overload; |
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|
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#use 5.020; # recommended for $& without performance penalty |
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|
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# regex syntax |
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# . literal dot (like "\." in normaql regexes) |
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# · match one character (like "." in normal regexes) |
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# ** match anything (like ".*" in normal regexes) |
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sub uriregex { |
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overload::constant qr => sub { |
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local $_ = shift; |
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|
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s/\./\\./g; |
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s/·/./g; |
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s/\*\*/.*/g; |
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|
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$_ |
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}; |
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} |
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|
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BEGIN { uriregex } |
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|
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use Apache2::Const -compile => qw( |
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OK DECLINED DONE NOT_FOUND SERVER_ERROR AUTH_REQUIRED FORBIDDEN |
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PROXYREQ_REVERSE |
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); |
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use Apache2::RequestUtil (); |
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use Apache2::RequestRec (); |
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use Apache2::Connection (); |
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use Apache2::Util (); |
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use Apache2::URI (); |
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|
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use APR::Const -compile => qw( |
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FILETYPE_DIR FINFO_NORM |
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); |
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use APR::Error (); |
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use APR::Finfo (); |
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|
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use common::sense; |
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|
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# per-request values, cached here for performance, use them |
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our $req; # Apache2::RquestRec |
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our $host; # $req->hostname |
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our $uri; # $req->uri, already resolved .. and protects against %xx, hopefully |
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our $ip; # $req->connection->client_ip, alternative ->useragent_ip |
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|
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# finish immediately with given status |
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sub status($) { |
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die \(my $status = shift); |
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} |
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|
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#sub escape_path($) { |
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# Apache2::Util::escape_path shift, $req->pool |
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#} |
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|
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# escapes everything not allowed in a url hpath |
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sub pesc($) { |
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local $_ = shift; |
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|
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s/([^a-zA-z0-9\$\-_.+!*'(),;?&=\/])/sprintf "%%%02x", ord $1/ge; |
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|
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$_ |
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} |
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|
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sub err($) { |
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warn "$_[0]"; |
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status 500; |
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} |
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|
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# external redirect with status code |
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sub redirect($$) { |
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my ($status, $location) = @_; |
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|
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# $location =~ s,^(http://[^/:]+)/,$1:34567/,;#d# |
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|
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$req->headers_out->set (Location => $location); |
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status $status; |
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} |
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|
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# permanent external redirect |
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sub rperm($) { |
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redirect 301, shift |
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} |
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|
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# temporary redirect, could be internal, but never is |
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sub rtemp($) { |
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redirect 302, shift |
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} |
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|
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# internal redirect, TODO |
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sub rint($) { |
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&rtemp |
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} |
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|
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# serve some path, do not call directly |
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sub _rpathname($) { |
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my $path = shift; |
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|
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my $finfo = eval { APR::Finfo::stat $path, APR::Const::FINFO_NORM, $req->pool } |
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or status Apache2::Const::NOT_FOUND; |
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|
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# let mod_dir, mod_autoindex and the default-handler handle this |
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$req->filename ($path); |
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$req->finfo ($finfo); |
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# warn "serve <$path,",$req->handler,">\n";#d# |
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status Apache2::Const::OK; |
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} |
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|
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# serve a regular file from disk |
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sub rfile($) { |
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$req->handler ("default-handler"); |
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&_rpathname |
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} |
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|
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# serve a directory from disk |
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sub rdir($) { |
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my $path = shift; |
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|
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if ($req->uri !~ m,/$,) { |
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# redirect dir to dir/ |
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rperm $req->construct_url (pesc $req->uri . "/"); |
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|
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} elsif (-e "$path/index.html") { |
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# mod_dir emulation, display index.html if any |
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$req->content_type ("text/html"); |
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rfile "$path/index.html"; |
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} elsif (-e "$path/index.xhtml") { |
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$req->content_type ("text/html"); # we assume to follow the compatibility guidelines |
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rfile "$path/index.xhtml"; |
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|
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} else { |
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# let mod_autoindex handle it later |
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$req->handler ("httpd/unix-directory"); |
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_rpathname $path; |
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} |
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} |
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|
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# like rpath, but assumes caller already stat'ed |
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sub rpath_nostat($) { |
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-d _ ? &rdir : &rfile |
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} |
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|
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# serve a generic path, can be dir or file |
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sub rpath($) { |
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stat $_[0]; |
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&rpath_nostat |
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} |
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|
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# sets SCRIPT_NAME and PATH_INFO from previous regex match |
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# pathinfo must be specified via a regex match |
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# either |
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# - $1 has matched SCRIPT_NAME |
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# - OR $1 as above, and $2 matches PATH_INFO (for extra checking) |
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# - OR (?<name>...) and (?<path>...) exist and match SCRIPT_NAME and PATH_INFO. |
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sub _get_pathinfo() { |
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my ($name, $path); |
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|
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if (exists $+{name} && exists $+{path}) { |
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$name = $+{name}; |
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$path = $+{path}; |
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} elsif (defined $1) { |
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$name = $1; |
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$path = defined $2 ? $2 : substr "$`$&$'", $+[1]; |
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} else { |
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err "$uri: cannot set pathinfo"; |
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} |
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|
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if ($uri ne "$name$path") { |
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err "$uri: imperfect split into <$name> and <$path>"; |
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} |
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|
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($name, $path) |
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} |
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|
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sub _set_pathinfo() { |
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my ($name, $path) = _get_pathinfo; |
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|
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$req->uri ("$name$path"); |
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$req->path_info ($path); |
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} |
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|
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# run a cgi script, first argument is script, |
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# also sets pathinfo, see _get_pathinfo |
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sub rcgi($) { |
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my ($path) = @_; |
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|
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_set_pathinfo; |
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|
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$req->handler ("cgi-script"); |
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$req->notes->set ("alias-forced-type" => "cgi-script"); # leave a note for mod_cgi, so it ignores missing ExecCGI |
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_rpathname $path; |
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} |
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|
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# simplest reverse proxy, target is target url for this request |
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sub rproxy($;$) { |
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my ($target, $preservehost) = @_; |
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|
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$req->proxyreq (Apache2::Const::PROXYREQ_REVERSE); |
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$req->filename ("proxy:$target"); |
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$req->handler ("proxy-server"); |
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$req->subprocess_env->set ("proxy-sendchunked", 1); |
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#$notes->set ("proxy-nocanon", 1); |
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#$env->set ("proxy-initial-not-pooled", 1); |
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|
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# disable compression, see http://www.apachetutor.org/admin/reverseproxies |
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# $req->headers_in->unset ("accept-encoding"); |
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# alternatively recompress, SetOutputFilter INFLATE;DEFLATE |
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|
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$req->add_config (["ProxyPreserveHost on"], ~0) |
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if $preservehost; |
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|
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$req->headers_out->set ("x-forwarded-for", $req->connection->client_ip); |
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$req->headers_out->set ("x-forwarded-proto", "https"); # unable to find a way to access ap_http_scheme |
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|
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status Apache2::Const::OK; |
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} |
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|
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# host, port |
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# also sets pathinfo, see _get_pathinfo |
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sub rscgi($;$) { |
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my ($target) = @_; |
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|
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_set_pathinfo; |
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rproxy $target; |
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|
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# notes: uds_path |
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} |
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|
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# reverse proxy |
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# path is local root uri |
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# target is target root url |
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# suffix is appended to target url |
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# @lines is extra config lines |
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sub rproxy_html($$$@) { |
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my ($path, $target, $suffix, @lines) = @_; |
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|
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(my $cpath = $path) =~ s/([^A-Za-z0-9\/.\-_])/sprintf "\\x%02x", ord $1/ge; |
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|
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push @lines, ( |
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"ProxyPassReverse /", |
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"ProxyHTMLEnable on", |
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# "ProxyHTMLURLMap $target $cpath", |
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# "ProxyHTMLURLMap / $cpath/", |
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); |
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|
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# warn "PROXY<$path,$target,$suffix>\n";#d# |
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# warn map "$_\n",@lines; |
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|
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$req->add_config (\@lines, ~0, $path); |
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|
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rproxy "$target$suffix"; |
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} |
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|
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my $rules; |
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|
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sub load_rules { |
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open my $fh, "<:raw", Apache2::ServerUtil::server_root . "/rules" |
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or die Apache2::ServerUtil::server_root . "/rules: $!"; |
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local $/; |
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|
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$rules = <$fh>; |
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|
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$rules = eval "use common::sense; BEGIN { uriregex }\nsub {\n#line 0 'rules'\n$rules\n}" |
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or die $@; |
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|
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warn "proxy rules successfully loaded.\n"; |
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|
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Apache2::Const::OK |
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} |
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|
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sub map_to_storage { |
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local $req = shift; |
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local ($host, $uri, $ip) = ($req->hostname, $req->uri, $req->connection->client_ip); |
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|
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eval { |
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# the uri is pre-parsed and "protected" by apache |
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# the hostname is lowercased but otherwise completely unchecked, |
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# so better be safe than sorry |
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$host =~ /^[A-Za-z0-9\-.]+$/ |
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or status 404; |
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|
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# must have at least one dot |
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$host =~ /./ |
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or status 404; |
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|
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local $_ = "$host$uri"; |
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$rules->($req); |
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}; |
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|
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if ($@) { |
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if (SCALAR:: eq ref $@) { |
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return ${$@}; |
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} else { |
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die; |
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} |
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} |
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|
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Apache2::Const::NOT_FOUND |
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} |
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|
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load_rules; |
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|
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warn "proxy loaded and iniitalised.\n"; |
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|
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1 |
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