tar xfz c_icap-030606rc1.tar.gz
cd c_icap-030606rc1
./configure --enable-static --with-clamav --prefix=/usr/local/c_icap
make install

Configs will be in /usr/local/c_icap/etc

Open c-icap.conf with your favorite editor and add following settings:

acl localsquid_respmod src 127.0.0.1 type respmod
acl localsquid src 127.0.0.1
acl externalnet src 0.0.0.0/0.0.0.0
icap_access allow localsquid_respmod
icap_access allow localsquid
icap_access deny externalnet

Also check other settings and make necessary changes that suites your needs.

I've made a c-icap FreeBSD 6.1 (i386) package for you, see Downloads section of this website.

Step 3
--------
After making config changes run c-icap to test it.

/usr/local/c_icap/bin/c-icap

Having no messages is good. Now we need to make sure that daemon is running and listening on port 1344.

ps ax | grep c-icap

Also we can verify that with "netstat" command.

Step 4
--------

Download squid with c-icap support from sourceforge.net
Unpack, configure it and compile it.

tar xfz squid-icap-2.5.STABLE12-20051102.tgz
cd squid-icap-2.5.STABLE12-20051102
./configure --enable-icap-support --prefix=/usr/local
make install

If this step fails for you, you can cvsup /usr/ports/www, to have the last version of squid, that have c-icap patch included, configure it and compiled with icap support.

./configure --bindir=/usr/local/sbin --sysconfdir=/usr/local/etc/squid --datadir=/usr/local/etc/squid --libexecdir=/usr/local/libexec/squid --localstatedir=/usr/local/squid --enable-removal-policies=lru,heap --enable-auth=basic,ntlm,digest --enable-basic-auth-helpers=NCSA,PAM,MSNT,SMB,winbind,YP --enable-digest-auth-helpers=password --enable-external-acl-helpers=ip_user,unix_group,wbinfo_group,winbind_group --enable-ntlm-auth-helpers=SMB,winbind --enable-storeio=ufs,diskd,null --enable-underscores --enable-err-languages=English --enable-default-err-language=Spanish --with-large-files --enable-large-cache-files --enable-delay-pools --enable-ipf-transparent --disable-ident-lookups --enable-snmp --enable-removal-policies --prefix=/usr/local i386-portbld-freebsd6.1 --enable-pf-transparent --enable-icap-support

It will be installed into /usr/local/squid

We need to create proxy cache and log directories.

cd /usr/local/squid/var
chown nobody cache/ logs/
chgrp nobody cache/ logs/

Run following command to precreate squid cache tree:

/usr/local/squid/sbin/squid -z

By default the cache is configure as:
cache_dir ufs /usr/local/squid/var/cache 100 16 256

Now let's configure it. The config file is in /usr/local/squid/etc/squid.conf

First of all allow access to proxy from your network.

acl mynetwork src 192.168.2.0/24
http_access allow mynetworks

At this moment we have a working proxy but without c-icap support.

Open /usr/local/squid/etc/squid.conf in your favorite editor

Find each of following keywords and replace the value as below:

icap_enable          on
icap_preview_enable  on
icap_preview_size    128
icap_send_client_ip  on
icap_service         service_avi_req reqmod_precache 0 icap://localhost:1344/srv_clamav
icap_service         service_avi respmod_precache 1 icap://localhost:1344/srv_clamav
icap_class           class_antivirus service_avi service_avi_req
icap_access          class_antivirus allow all

Let's restart squid with updated configuration:

/usr/local/squid/sbin/squid -k reconfigure