Added reverse proxy support from Kim Holviala. His comments regarding

this addition follow:

  The patch implements a simple reverse proxy (with one funky extra
  feature). It has all the regular features: mapping remote servers to local
  namespace (ReversePath), disabling forward proxying (ReverseOnly) and HTTP
  redirect rewriting (ReverseBaseURL).

  The funky feature is this: You map Google to /google/ and the Google front
  page opens up fine. Type in stuff and click "Google Search" and you'll get
  an error from tinyproxy. Reason for this is that Google's form submits to
  "/search" which unfortunately bypasses our /google/ mapping (if they'd
  submit to "search" without the slash it would have worked ok). Turn on
  ReverseMagic and it starts working....

  ReverseMagic "hijacks" one cookie which it sends to the client browser.
  This cookie contains the current reverse proxy path mapping (in the above
  case /google/) so that even if the site uses absolute links the reverse
  proxy still knows where to map the request.

  And yes, it works. No, I've never seen this done before - I couldn't find
  _any_ working OSS reverse proxies, and the commercial ones I've seen try
  to parse the page and fix all links (in the above case changing "/search"
  to "/google/search"). The problem with modifying the html is that it might
  not be parsable (very common) or it might be encoded so that the proxy
  can't read it (mod_gzip or likes).

  Hope you like that patch. One caveat - I haven't coded with C in like
  three years so my code might be a bit messy.... There shouldn't be any
  security problems thou, but you never know. I did all the stuff out of my
  memory without reading any RFC's, but I tested everything with Moz, Konq,
  IE6, Links and Lynx and they all worked fine.

1 files changed, 42 insertions, 1 deletions

diff --git a/src/grammar.y b/src/grammar.y
index 00596dd..9f3a74c 100644
--- a/src/grammar.y
+++ b/src/grammar.y
@@ -1,4 +1,4 @@
-/* $Id: grammar.y,v 1.23 2003-06-26 18:17:09 rjkaes Exp $
+/* $Id: grammar.y,v 1.24 2004-01-26 19:11:51 rjkaes Exp $
  *
  * This is the grammar for tinyproxy's configuration file. It needs to be
  * in sync with scanner.l. If you know more about yacc and lex than I do
@@ -50,6 +50,7 @@ int yylex(void);
 %token KW_FILTER KW_FILTERURLS KW_FILTEREXTENDED KW_FILTER_DEFAULT_DENY
 %token KW_FILTER_CASESENSITIVE
 %token KW_UPSTREAM
+%token KW_REVERSEPATH KW_REVERSEONLY KW_REVERSEMAGIC KW_REVERSEBASEURL
 %token KW_CONNECTPORT KW_BIND
 %token KW_STATHOST
 %token KW_ALLOW KW_DENY
@@ -167,6 +168,46 @@ statement
 		  log_message(LOG_WARNING, "X-Tinyproxy header support was not compiled in.");
 #endif
 	   }
+	| KW_REVERSEPATH string
+	   {
+#ifdef REVERSE_SUPPORT
+		  reversepath_add(NULL, $2);
+#else
+		  log_message(LOG_WARNING, "Reverse proxy support was not compiled in.");
+#endif
+	   }
+	| KW_REVERSEPATH string string
+	   {
+#ifdef REVERSE_SUPPORT
+		  reversepath_add($2, $3);
+#else
+		  log_message(LOG_WARNING, "Reverse proxy support was not compiled in.");
+#endif
+	   }
+	| KW_REVERSEONLY yesno
+	   {
+#ifdef REVERSE_SUPPORT
+		  config.reverseonly = $2;
+#else
+		  log_message(LOG_WARNING, "Reverse proxy support was not compiled in.");
+#endif
+	   }
+	| KW_REVERSEMAGIC yesno
+	   {
+#ifdef REVERSE_SUPPORT
+		  config.reversemagic = $2;
+#else
+		  log_message(LOG_WARNING, "Reverse proxy support was not compiled in.");
+#endif
+	   }
+	| KW_REVERSEBASEURL string
+	   {
+#ifdef REVERSE_SUPPORT
+		  config.reversebaseurl = $2;
+#else
+		  log_message(LOG_WARNING, "Reverse proxy support was not compiled in.");
+#endif
+	   }
         | KW_UPSTREAM unique_address ':' NUMBER
           {
 #ifdef UPSTREAM_SUPPORT