Fix netcat option in udp_check.sh for CentOS/RHEL
-w (timeout) option doesn't do anything in nmap-ncat (default netcat in
CentOS/RHEL) for UDP datagrams, and nmap-ncat has a default idle timeout
set to 2 seconds.
We can get the same behavior as netcap-openbsd (Debian/Ubuntu) by
setting that idle timeout (-i) option to 1 second.
This commit detects the flavor of the netcat binary (nmap vs other) and
uses it to adapt the parameters.
Story: 2007688
Task: 39800
Change-Id: I0100aaa428477f011bd39a90dd4ec98199b4bebc
(cherry picked from commit 6354f92ecc
)
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@ -1,4 +1,16 @@
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#!/bin/bash
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#!/bin/bash
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nc_cmd=`which nc`
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nc_cmd=`which nc`
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$nc_cmd -uzv -w1 $1 $2 > /dev/null
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nc_flavor=$($nc_cmd --version 2>&1 | grep -o nmap)
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case "$nc_flavor" in
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nmap)
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nc_flavor_opts="-i1"
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;;
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*) # default, probably openbsd
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nc_flavor_opts="-w1"
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;;
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esac
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$nc_cmd -uzv $nc_flavor_opts $1 $2 > /dev/null
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exit $?
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exit $?
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