c-icap(8)
NAME
c-icap - ICAP filtering server
SYNOPSIS
c-icap [ -f config-file ] [ -N ] [ -d debug-level ] [ -D ]
DESCRIPTION
c-icap is an implementation of an ICAP server. It can be used with HTTP proxies that support the ICAP protocol. Most of the comercial HTTP proxies must support ICAP pcotocol.
OPTIONS
-f config-file
Specify the configuration file
-N Do not run as daemon
-d level
Specify the debug level
-D Print debug info to stdout
FILES
/etc/c-icap/c-icap.conf
The main configuration file
/etc/c-icap/c-icap.magic
In this file defined the types of files and the groups of file
types.
/var/run/c-icap.pid
By default c-icap writes its pid in this file. The path of this
file can changed using the PidFile configuration parameter in
the c-icap.conf file
/var/run/c-icap.ctl
The commands socket. This file used to send commands to the icap
server from command line. For information about implemented
commands look below in the "Implemented commands" sub-section
NOTES
Implemented commands
Currently the following commands are implemented:
stop
The c-icap will shutdown
reconfigure
The service will reread the config file without the need to stop
and restart the c-icap server. The services will be
reinitialized
relog
This command causes c-icap to close and reopen the log files.
This is very useful for log rotation.
Services and modules can define their own commands.
Examples:
To reconfigure c-icap:
echo -n "reconfigure" > /var/run/c-icap.ctl
To rotate access log:
mv /var/log/c-icap/access.log /var/log/c-icap/access.log.1
echo -n "relog" > /var/run/c-icap.ctl
Lookup tables
Lookup tables are simple read-only databases. A lookup table can
defined in c-icap.conf file using the form:
type:path
where the type is the type of lookup table and path is the extra
information required to use the table (e.g. file path). Currently the
following lookup table types defined internally by c-icap:
file Simple text file databases. The database records are stored in
text files in the form:
key[: value1, value2 ...]
example path definition:
file:/path/to/the/file.txt
hash Similar to file lookup tables but c-icap uses fast hashes for
searching.
example path definition:
hash:/path/to/the/file.txt
regex Similar to the file lookup tables but the keys are regular
expressions in the form /regex/flags . For possible flags values
please read 'Regex expressions' paragraph in this manual.
example regex lookup table data:
/^[a-m].*/i: group1
/^[n-z].*/i: group2
example path definition:
regex:/path/to/the/file.txt
Regex expressions
The c-icap regex expressions have the form /regex_definition/flags
where "flags" is one or more letters, its of them express a flag.
Common flags
g This flag forces the score multiplied by the number of regex
expression matches. For example if the expression matches 5
times and the devined score value is 10 then the final score
will be 50.
i Do caseless matching
m Match-any-character operators don't match a newline
and ^$ operators does not match newlines within data
If the module compiled using the pcre library the following flags can
be used
s (PCRE_DOTALL) matches anything including NL
x (PCRE_EXTENDED) Ignore whitespace and # comments
A (PCRE_ANCHORED) Force pattern anchoring
D (PCRE_DOLLAR_ENDONLY) $ not to match newline at end
U (PCRE_UNGREEDY) Invert greediness of quantifiers
X (PCRE_EXTRA) PCRE extra features
u (PCRE_UTF8) Run in UTF-8 mode
Runtime information
Someone can retrieve runtime information using the info service. The
information includes bytes received and transmited, active services,
information about service usage and many other. The information
provided in HTML and text format.
Example:
Retrieve runtime information from command line:
c-icap-client -i localhost -s "info?view=text" -req "a_url"
SEE ALSO
c-icap-client(8) c-icap-stretch(8) c-icap-config(8) c-icap-libicapapi- config(8) c-icap-mkbdb(8)
BUGS
Many...
AUTHOR
Tsantilas Christos
c_icap 0.4.4 c-icap(8)
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