Squid/ClamAV: Fix for C-ICAP (0.5.x) not starting in pfSense

Currently running pfSense 2.4.4 snapshot, I found a problem where Squid+ClamAV would not work. Specifically, c-icap would not start. If you were to start c-icap manually as instructed on the rc.d unit, you'd meet this error:

[2.4.4-RELEASE][root@pfsense]/usr/local/bin: c-icap -D -d 9
Fatal error while parsing config file: "/usr/local/etc/c-icap/c-icap.conf" line: 134
The line is: ListenAddress

Googling, you'd find this: https://sourceforge.net/p/c-icap/mailman/message/36379708/

It seems, on 0.5.x, ListenAddress has been removed in favor of the Port statement.

To fix C-ICAP, you must:

  1. Remove "ListenAddress" statement on line 134 of c-icap.conf
  2. Replace "Port 1344" statement on line 142 of c-icap.conf with "Port"
  3. To prevent pfSense from overwriting, "chmod -w" that file to prevent writes to it.