[cgiwrap-users] Implementing IPv6 support

[Hans v. K. <han...@me...>]

Hi cgiwrap-folks,

While carefully IPv6-enabling our network infrastructure, I discovered 
cgiwrap does not yet handle IPv6 addresses in configuration files and 
CGI environment variables.

Currently cgiwrap requires a dotquad IPv4 address in REMOTE_ADDR 
environment variable. So even if host-checking is not used in 
cgiwrap.(deny|allow), any request over IPv6 will be refused when cgiwrap 
is compiled with --with-host-checking.

Currently I'm using cgiwrap without --with-host-checking to work around 
this issue.

RFC 3875 (CGI) and RFC 3513 (IPv6 Addressing Architecture) describe the 
possible content of REMOTE_ADDR cgiwrap should be able to parse.

In configuration file parsing, support for IPv6 addressing like 
2001:888:30a9:1e7::/64 should be added. I think it would be rather 
trivial to just add ipv4/prefix (like 10.0.0.0/22) support in addition 
to specifying netmasks in dotquad format.

Although C is not a programming language I speak fluently (yet), I'd 
like to give it a shot and code IPv6 support into cgiwrap. So, if the 
cgiwrap author or another experienced C programmer could review the 
changes and probably help me out a bit when needed, I'd be happy to 
contribute to cgiwrap.

Greetings,
Hans van Kranenburg