CVS log for loncom/auth/lonracc.pm

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- Retrieval of requestor's IP address centralized in lonnet::get_requestor_ip()
- Domain configuration to allow domain's LON-CAPA nodes to operate behind a
  WAF/Reverse Proxy using aliased hostname (CNAME).
- Web requests from other nodes bypass the WAF as their requests are made
  directly to the server hostname (A record); same for internal LON-CAPA
  connections for lonc -> lond.

Added/modified POD documentation

- maiking this get_iphost thing more targeted easier to dns with

- starting work on moving to distributed DNS, eliminate usage of the lonnet hostanme global

- got the logic backwards

- if the file doesn't exist return NOT_FOUND rather thaen letting it
  end up loggin the error message in the webserver error logs

- performace enhancements (no need to do hostname lookups in the uploaded case or if the .subscription file doesn't exist or its a meta file)
- some style
- notice when gethostbyname fails and fail gracefully rather than ISE

- ENV -> env

- more delayed IP rsoultion work

- better job of finding our whose asking for stuff

- removing IP number use from webserver some of BUG#2330

Bug #2951: do not read hosts.tab every time somebody wants a /raw resource.

Need to make sure that this still works for multi-domain servers, since I
remember that at some point the order of entries in either hosts.tab or
domain.tab mattered - this is now in random hash order.

Copying lines from lontokacc.pm to make DOCS-style courses work on
standalone machines again.

Requests for files in /raw/uploaded on the home server for a course, generated  by lonnet::getuploaded() now use lonracc.pm for the AccessHandler phase.

- actually returning the FORBIDDEN now

- ctually declare variables in proper scope.
- shows list of all non subscribed hosts if it can't find a subscribed host

- machines multiple have multiple entries in hosts.tab, check if any of them are subscribed before giving up

Minor bug squish.  Added forgotten '{'.

This took way longer then it should have.

lonracc and lontokacc will now be accepting when one of two conditions
is met:

* The double-reverse lookup, according to $r->get_remote_host(REMOTE_DOUBLE_REV)
  is successful. This is identical to before.
* The claimed host is the same as the current server, which works even with
  wonky /etc/hosts files.

I was initially worried this might be a potential security problem, but I do
not believe it is. The reason is that this clause ONLY comes into effect
when you're trying to spoof yourself as the server you are talking to. Even
if you succeed, the server will then proceed to send itself a subscription
request, which is not a big deal, PLUS the reason this is occuring in the
first place is that the name maps back to 127.0.0.1, SO this request will
go through the local interface anyhow, meaning Mr. Remote Attacker can't even
see the subscription request that wouldn't help him anyhow.

So in the end, all this does is hypothetically allow an attacker to cause a
server machine to subscribe itself to resources it hosts. This does not give
the hypothetical attacker any benefit. Thus, this is not a security hole.

- Now have .subscription files, implemntation should be backward compatible and also should start migrating subscriptions over
- BUG#332

PODing this file

GPL

Now also replicate metadata files, filename.meta

LON-CAPA Communication Module

Initial revision