Author image Zane C. Bowers-Hadley

NAME

cnetstat - a netstat like utility that supports color and searching

SYNOPSIS

cnetstat [-t] [-u] [--drp] [-S <sort>] [-s <states>] [-c <CIDRs>] [-p <ports>] [-P <protocols>] [<-a>] [-l] [-i] [--nc] [<--ptr> <ptrs>] [--rptrs <regexs>] [--Si] [--si] [--ci] [--pi] [--Pi] [--ptri] [--rptri]

FLAGS

-a

Show all connections, including those in the LISTEN state.

-c <CIDRs>

A comma seperated list of CIDRs to search for.

--ci

Invert the CIDR search.

--drp

Don't resolve port numbers to names.

-i

Invert the sort.

-l

Show connections in the LISTEN state. This is the equivalent of '-a -s listen'. If combined with -s, it will display LISTENing sockets and whatever is specified via -s.

--nc

Don't colorize the output. If The NO_COLOR environment variable is set, then it will it will also not be colorized and this flag will be inverted.

-p <ports>

A comma seperated list of ports to search for.

--pi

Invert the port search.

--ptr <ptrs>

A comma seperated list of PTRs to search for.

--ptri

Invert the PTR search.

-P <protocols>

A comma seperated list of protocols to saerch for.

--Pi

Invert the protocol search.

--rptr <regexs>

A comma seperated list of regular expressions to use for matching PTRs.

--rptri

Invert the regex PTR search.

-s <states>

A comma seperated list of states to search for.

--si

Invert the state ssearch.

-S <sort>

The sort method to use. This is one of the supported methods by Parse::Netstat::Sort.

    host_f     Host, Foreign (default)
    host_l     Host, Local
    port_f     Port, Foriegn
    port_l     Port, Local
    state      State
    protocol   Protocol
    q_r        Queue, Receive
    q_s        Queue, Send
    none       No sorting is done.

The ones below are dual sort and take noticably longer than the ones above.

    host_ff    Host, Foreign First
    host_lf    Host, Local First
    port_ff    Port, Foreign First
    port_lf    Port, Local First
    q_rf       Queue, Receive First
    q_sf       Queue, Send First

-t

Don't fetch TCP info.

-u

Don't fetch UDP info.

ENVIRONMENT VARIABLES

CNETSTAT_invert

This is either 0 or 1. If defined it will be used for XORing the -i flag.

    export CNETSTAT_invert=1
    # run cnetstat inverted
    cnetstat
    # run it non-inverted, the opposite of what the -i flag normally is
    cnetstat -i

CNETSTAT_sort

Sets the default sort method. -S overrides this.

NO_COLOR

If this is set, The output will not be colorized. If this is set, the --nc flag is also inverted.

RES_NAMESERVERS

A space-separated list of nameservers to query used by Net::DNS::Resolver.

There are a few more possible ones, but this is the most useful one and that documentation really belongs to that module.

EXAMPLES

    cnestat -s established,time_wait

Return a list of connection that are in the established or time_wait state.

    cnestat -c ::/0

Return a list of all IPv6 addresses.

    cnestat -c ::1/128,127.0.0.1/32

Return all connections to localhost.

    cnestat -c 192.168.15.2/32 -l

Display all connections listening explicitly on 192.168.15.2.

    cnetstat -S host_f -i

Sort the connections by the foreign host and invert the results.

    cnetstat -c 10.0.0.0/24 --ci

Show connections that are either not locally or remotely part of the 10.0.0.0/24 subnet.

    cnetstat --ptr foo.bar

Find connections to/from IPs that have a PTR record of foo.bar.

    cnetstat --rptr foo

Find connections to/from IPs that a PTR record that matches the regexp /foo/.

    cnetstat --ptr foo.bar --ptri

Find connections to/from IPs that do not have a PTR record of foo.bar.