Squid internals

The IP and FDQN cache
Usage
ipcache_nbgethostbyname(name, handler, handlerdata)
Start the resolving process on host 'name'
First lookup the IP cache, and if this misses, perform a DNS lookup
ipcache_gethostbyname(name, flags)
Check if the given name is in the IP cache
Do not block unless IP_BLOCKING_LOOKUP or IP_LOOKUP_IF_MISS is set
ipcache_purgelru()
A periodic event called to clean up the cache
This can be tweaked by the ipcache_high threshold