Let purge.list prune the tail of the list before dumping.

Add a protective object to prevent purge.list from pruning our
purges before we test their numbers.



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For instance:

        purge req.http.host ~ www.foo.com && req.url ~ "\.png$"
        purge obj.http.set-cookie ~ USER=383839

Now, why would you want purge on request headers and not object headers ?

Simple, some information the object does not have, the Host: header is
a good example.

Assuming that the Host: header is part of the hash we use to lookup
an object (as is the default), we can avoid copying that field into
the object (saving memory: O(nObjects)) by using the request value
to purge against.



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You can now purge using these four conditionals:

        purge req.url == "/diediedie.html"
        purge req.url != "/index.html"
        purge req.url !~ "\.html$"
        purge req.url ~ "\.jpg$"



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Emit && \ for line continuation.



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Move the body of cli_quote() to vsb_quote() and give it a, presently
unused, "how" argument flag.

We currently have far too many "quote this string properly" implementations
in varnish, hopefully, this will replace most of them.

Once this stabilizes, vsb_quote() will be contributed back to FreeBSD.



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After HSH_Lookup() returns NULL indicating a busy object, we diddled
the session a bit to transfer the per-request stats to the session
counters with SES_Charge().

Not only was it inconsistent to charge accounting data in the middle
of a request, it was also illegal because after the hash lock was
released we no longer owned the session.

Once a system is under sufficient load that there is a queue for the
CPU, a race could happen where upon hitting a busy object, the hash lock
was released, another thread would schedule, finish the busy object,
start the sessions on the waiting list, finish off the request we had
and then when we get the cpu again and access it, it's gone.

The previous commit (r3512) eliminated the need to call SES_Charge,
this commit removes the (option) shmlog message inside the hash lock
thus, hopefully, eliminating the race that caused #418.

Fixes: #418



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Originally we shaved 64 bytes from the session to the worker thread
by keeping the current requests accounting stats in the worker thread.

For reasons which will be explained in the next commit, this is no
longer a good idea, and this commit moves these counters from
the worker thread to the session at a slight but all in all
trivial cost in memory footprint.

Remove the call to SES_Charge() when we hit a busy object, it is
not necessary to clean the worker thread counters here now.

Move these counters from the worker thread to the see



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Change the way bans/purges are stored, so that each ban has a list of
conditions to test.

This paves the way for a much more expressive ban/purge syntax where
things like:

        purge req.http.host ~ "web1.com" && req.url ~ "\.png"
        purge obj.age > 1w && obj.size > 1MB
        purge obj.http.set-cookie ~ "USER=838339" && req.url ~ "\.html"

become possible.

Not quite there yet though.



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Fixes #376

Addendum to r3501: remove the file from the list.



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Don't panic if the chunked header is ridiculously long, just fail
the transaction.

Fixes #387



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If we get more HTTP headers than we have room for (default: 28) we
used to ignore the rest.

This is not a bright solution if crucial HTTP headers like
"Content-Length" or "Transfer-Encoding" are last and get ignored.

In general, it is highly suspect to randomly ignore HTTP headers,
as opposed to deliberately ignoring them, either by having first
looked at them and found them uninteresting, or by having looked
for the headers we care about, and having not matched some others.

Change too many headers to firm error condition: 400 if from the
client, and 503 (like every other trouble) if from the backend.

Fixes #416



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Give it proper semantics



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Remove pointless initialization.

Fix indentation.



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Check close(2) status.
Assert that we read the C-source file.



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Generate VCL_RET_* as enumbering instead of bitmap, compensate
elsewhere as required.

Remove unecessary args to VCL_[RM]ET_MAC().

Rely on VCL_RET_* definition in vcl.h

Adjust to VCL_RET_* being enum instead of bitmap.

This solves the "restart" procaction issue in a non-hackish way
and looks better overall.



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