size disks.

Submitted by:	wichert

Fixes ticket 283



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principle of the situation.



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routine.

Follow RFC2616 more closely, and make relative (ie: max-age) specifications
take precedence over absolute specifications (Expires:)

Add an explicit clock-skew window (parameter: clock_skew) and only
interpret Expires: in absolute terms if the Date: header is inside
this window.

Explicit check for the case where the backend sends an Expires: which
is before the Date:, even if the Date: is out side our window.




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non-XML detector logic.

Add a testcase to see if it works and that we can override it.



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picks off your loopback interface.



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like XML.  Our definition of "looks like XML" is that the first
non-white-space character is '<'.

Add a new parameter "esi_syntax" with bits to steer the ESI parser.

Use the first bit to disable the "looks like XML" check.



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Test caching of synthetic error pages (broken since 2266).  This will need revisiting once caching has been reimplemented.


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there to stop us.

Fixes #281



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The problem is that a TCP connection to 127.0.0.1 appearantly does
not originate on the loopback interface, but on some other interface
on the machine.



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might not be there yet.



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	Add IPv6 support (untested!)

	Implement evil-acls

IPv6 support
------------

I have implemented IPv6 filtering support, but I have done so blindly
as I have no IPv6 networks to test with.

Please double check before relying on this to work, and please report
your findings back to us.

Syntax
------

The ACL rules still have the same syntax, but the sematics have
expanded to handle IPv6 also:

    acl foo {

        "foohost";              // Match, if the address is one of the 
                                // ipv4 or ipv6 addresses of "foohost"

        ! "foohost";            // Fail, if...

        "192.168.1.7" / 24;     // Use mask for comparison:  The '7' is
                                // ignored

				// Implicit masks:
	!"172.16";		// Fail 172.16.0.0 to 172.16.255.255
	"10.0.0";		// Match 10.0.0.0 to 10.0.0.255
	

        "www.freebsd.org" / 24; // This will give compile error, because
                                // the "www.freebsd.org" has both ipv4 
                                // and ipv6 addresses, and using the same
                                // mask for both kinds do not make sense.

        ( ... );                // Ignore this rule if DNS lookup fails.

        ( ! "idiot.net" );      // If we can resolve "idiot.net", then
                                // return Failure to match, if we see them.
    }

Please notice that DNS lookup happens *only* on VCL compilation, if a
DNS record changes you need to recompile (ie: vcl.load or vcl.inline)
your VCL code again, it is not enough to just switch vcl (vcl.use).

(This is the same as with backend DNS lookups)

Evil-acls
---------

Most firewall or ip-filtering facilities, compile the lists of
networks and masks to a table, and matches proceed sequentially
through that table until the table is exhausted or a match is found.

Since we compile our ACLs into C-code, we might as well implement the
"evil-acl" concept, and compile the rules directly into C-code instead.

An ACL like this:

	acl foo {
		"172.16";
		!"172.16.17";
		"172.16.17.18";
		"172.16"/18;
	}

Compiles to:

	if (fam == 2) {
	 if (a[0] == 172) {
          if (a[1] == 16) {
           if (a[2] == 17) {
            if (a[3] == 18) {
             VRT_acl_log(sp, "MATCH bar " "172.16.17.18");
             return (1);
            }
            VRT_acl_log(sp, "NEG_MATCH bar " "172.16.17");
            return (0);
           }
           else if ((a[3] & 0xc0) == 0) {
            VRT_acl_log(sp, "MATCH bar " "172.16" "/18" );
            return (1);
           }
           VRT_acl_log(sp, "MATCH bar " "172.16");
           return (1);
          }
         }
        }
	VRT_acl_log(sp, "NO_MATCH bar");
	return (0);

As can be seen, for example the comparison with "172" is now shared
for all four rules in the ACL, instead of being carried out once for
each of the four rules.

In addition to this optimization, the C-compiler will of course use
its usual (and unusual) tricks to speed things up, quite likely inlining
the ACL code in the VCL functions where they are referenced.

It will also be noticed, that the compiler sorts the rules in "most
specific order".

This means that:
		"172.16.17.18";
gets tested before
		!"172.16.17";
even though it is listed later in the ACL.

Previously we tested the rules in the order given.



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The following perl one-liner is useful:
perl -ne 'if( $print == 1 ) { exit if( /^$/ ); eval "print " . $_; } $print = 1 if /default_vcl/;' mgt_vcc.c 
Fixes #135 (for now)


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-s file,<dir_or_file>,<size>,<granularity>
Fixes #244



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Takes a string argument, so it is possible to do:

	 panic "Trouble with " req.url " (not the way I expected it!);



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Added the variable server.port that holds the port on which the server has answered the request in the same way that server.ip holds the IP number. Fixes #264.


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it in the CLI.

Use it for cc_command and listen_address parameters



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