// set these for your server, and put this file in the same directory as

// nph-offload.c ...

// GDEBUG should be false at production time, but this lets you sanity check

// some things before going live.

// GDEBUG is also true. You probably want this to be true most cases.

#ifndef GDEBUGTOFILE

#define GDEBUGTOFILE 1

#endif

// Ignore this if either GDEBUG or GDEBUGTOFILE are zero.

// Set GDEBUGDIR to where debug logs should be written.

#ifndef GDEBUGDIR

#define GDEBUGDIR "/usr/local/apache/logs"

#endif

// Set this to non-zero to provide a listen server that serves HTTP requests

// directly. Set this to zero and you need to run as a cgi-bin program

// through another webserver. Obviously, you can't listen on port 80 if

// something else is using it.

#ifndef GLISTENPORT

#define GLISTENPORT 0

#endif

// Ignore this if GLISTENPORT == 0. This is the address to bind to. It should

// be a string literal ("39.15.124.111" or maybe "localhost" if another

// process is proxying). NULL is equivalent to IN_ADDRANY; bind to everything.

#ifndef GLISTENADDR

#define GLISTENADDR NULL

#endif

// Ignore this if GLISTENPORT == 0. Should probably be PF_INET or PF_INET6.

#ifndef GLISTENFAMILY

#define GLISTENFAMILY PF_INET

#endif

// Ignore this if GLISTENPORT == 0.

// Set this to a list of IP addresses from which you trust the X-Forwarded-For

// header. This has to match this format:

// "xxx.xxx.xxx.xxx", "yyy.yyy.yyy.yyy", [...more like that...]

// ...an array of C string literals.

// If you don't plan to serve from behind a known proxy on your LAN, you

// can just set this to NULL.

#ifndef GLISTENTRUSTFWD

#define GLISTENTRUSTFWD "127.0.0.1", "0.0.0.0"

#endif

// Ignore this if GLISTENPORT == 0.

// Set this to non-zero to make process fork to background on startup.

#ifndef GLISTENDAEMONIZE

#define GLISTENDAEMONIZE 0

#endif

// This works everywhere, but you probably don't want it if GLISTENPORT == 0.

// Set this to non-zero to make each transaction append a line to a log file

// in Apache Combined Log Format.

#ifndef GLOGACTIVITY

#define GLOGACTIVITY 0

#endif

// Ignore this if GLOGACTIVITY == 0.

// Set this to the filename to write log data to. Put a full path here!

#ifndef GLOGFILE

#define GLOGFILE "/usr/local/apache/logs/access.log"

#endif

// This is the server that you are offloading's IP address.

// We use this for DNS lookups (GBASESERVER is used for the "Host:" field in

// HTTP requests, etc). If you know the IP address will never change, you can

// save the several hundred kilobytes of address space that glibc uses...it

// loads a separate shared library for the DNS lookup, but it doesn't need

// to if GBASESERVERIP is an IP address in "xxx.xxx.xxx.xxx" format.

#ifndef GBASESERVERIP

#define GBASESERVERIP GBASESERVER

#endif

// This is the port on the base server to connect to (default for HTTP is 80).

#ifndef GBASESERVERPORT

#endif

// Time in seconds that i/o (to base server or client) should timeout in

// lieu of activity.

// This is where we'll cache files.

// Set GMAXDUPEDOWNLOADS to the number of concurrent connections one IP

// address can have for one download. This is largely meant to prevent

// download accelerators that open multiple connections that each grab a

// portion of the same file. Any connections over the limit are immediately

// rejected with a 403 Forbidden response explaining the issue.

// The same IP can download different files at the same time; we count the

// number of simultaneous accesses to the same URL from the same IP.

// Two people on two machines behind a NAT, downloading the same file, will

// look like a dupe.

// Set this to zero to disable it.

#ifndef GMAXDUPEDOWNLOADS

#define GMAXDUPEDOWNLOADS 1

#endif

// Set to 1 to try to change title in "ps" listings. It becomes:

// "offload: GET /my/url.whatever" (or whatever).

#ifndef GSETPROCTITLE

#define GSETPROCTITLE 1

#endif

// if you have a PowerPC, etc, flip this to 1.

#ifndef PLATFORM_BIGENDIAN

#if defined(__powerpc64__) || defined(__ppc__) || defined(__powerpc__) || defined(__POWERPC__)

#define PLATFORM_BIGENDIAN 1

#else

#define PLATFORM_BIGENDIAN 0

#endif

#endif

// Pick a unique name, letters and dashes.

// This should be unique for each cache, or you may have odd problems. So

// if you have two separate offload servers with their own unique caches on

// the same machine, you want to keep them separated.

// If you just want one offload server, the default is fine.

#ifndef SHM_NAME

#define SHM_NAME "mod-offload"

#endif

// You probably should leave this alone if you don't know what you're doing.

// Set this to non-zero to disable caching. This can be useful if you just

// want a lightweight HTTP server to handle the heavy lifting for large

// static files. For example, you could have Apache running on port 80 to

// handle most requests, so you get all the PHP, SSL, mod_*, .htaccess, etc

// goodness, but Apache eats several megabytes of RAM per connection when

// serving static files. If you have a multi-gigabyte static file, a client

// might consume that server's RAM for several hours to complete the

// transfer. Since most of the memory Apache consumes is irrelevant to

// sending static files, it might make sense to offload it to a lightweight

// process like this, with a 302 Redirect, and free up those resources for

// dynamic content. Very quickly you find yourself saving hundreds of

// megabytes.

// GNOCACHE changes a few rules. This process will no longer cache files, and

// GOFFLOADDIR refers to the DocumentRoot where files are read from. We will

// still do HTTP HEAD requests to the GBASESERVER for metadata, and to verify

// that we have access to the file (since we do no authorization

// ourselves). We access the file directly, instead of caching over HTTP, so

// be careful about file permissions, URI aliases, etc. This probably is only

// useful with GLISTENPORT != 0.

#ifndef GNOCACHE

#define GNOCACHE 0

#endif