Squid Programming

Question

Does anybody know a good tutorial about Squid plug-in development?

Answer 1

There is one in the squid documentation. IIRC it's fairly straightforward - squid forks a process and passes data down a pipe to the process. A somewhat out-of-date but still relevant programmer's guide can be found Here.

Answer 2

Squid is nowadays a pretty modular and extensible platform, so it really depends on what you need to do. Most information can be found in the squid wiki (http://wiki.squid-cache.org)

There is the "helper" family of coprocesses-based extensions (http://wiki.squid-cache.org/Features/AddonHelpers)

• redirector helpers (http://wiki.squid-cache.org/Features/Redirectors)
• authentication helpers for Basic/NTLM/Digest/Negotiate/Kerberos etc
• authorization helpers for LDAP/Active Directory/Session/...

In case you are interested in content modification there is ICAP for out-of-process adaptation and eCAP for in-process adaptation.

I'm sorry I can't post direct links; you'll find the data you need by looking for the relevant keywords in the squid wiki.

Answer 3

You might also find the Add-On Helpers for Request Manipulation topic useful.

Answer 4

You can visit http://www.squid-cache.org/Versions/v3/3.4/cfgman/ to understand the squid completely... I think the latest version 3.5 has arrived but this webpage can be a solution to your current problem.