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Top Forums Shell Programming and Scripting Help Generate new port base on the last port but not in used by other application Post 303004410 by jim mcnamara on Sunday 1st of October 2017 01:14:52 PM
Old 10-01-2017
These are the well known ports from IANA. Basically it means if you use one of these
adhoc you run the risk of breaking something - now or next week. Just because a port is unused right now does not mean it won't get used again soon.

Is there a reason you have to use low number ports?

Try something like this:
Code:
LASTPORT=32767
ss | awk ' /\*/ {print $6 } > portlist.txt

getport {
   result="FAIL"
   for (( i=8193; i<$LASTPORT; i++))
   do
         grep -q "$i" portlist.txt && continue
         result="$i"
         break
   done
   echo "$result"
}
# usage
port=$( getport )
if [ "$port" = "FAIL" ] ; then
   echo "no ports available"
   exit
fi
# use the port number here

You could also create an array (port based) on the awk output and search through the array rather than using grep. Use the mapfile command, which creates an array named MAPFILE with every port number in it. You can also use associative arrays to speed up your search. None of this is really useful except when you are creating lots of ports.
 

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semanage_port(3)					   Libsemanage API documentation					  semanage_port(3)

NAME
semanage_port - SELinux Network Ports Management API SYNOPSIS
#include <semanage/port_record.h> #include <semanage/ports_policy.h> #include <semanage/ports_local.h> This object contains properties associated with a range of network ports. For details on a specific function, see its manual page. Record API Overview semanage_port_create(3)- create a port range semanage_port_free(3)- release resources for this port range semanage_port_key_create(3)- create a key, which can be used to identify a port range semanage_port_key_free(3)- release resources for this port range key semanage_port_key_extract(3)- create a key matching this port range semanage_port_clone(3)- create an identical port range (deep-copy clone) semanage_port_compare(3)- compare this port range to the provided key semanage_port_compare2(3)- compare this port range to another Properties API Overview semanage_port_get_proto(3)- return the protocol for this port range semanage_port_get_proto_str(3)- return a string representation of the given port protocol semanage_port_set_proto(3)- set the protocol for this port range semanage_port_get_low(3)- return the low port number for this port range semanage_port_get_high(3)- return the high port number for this port range semanage_port_set_port(3)- set the port number (same low and high) for this port range semanage_port_set_range(3)- set the low and high port number for this port range semanage_port_get_con(3)- return the SELinux context for this port range semanage_port_set_con(3)- set the SELinux context for this port range Record Store API Overview semanage_port_modify_local(3)- add or update a port range in the local store semanage_port_del_local(3)- delete a port range from the local store semanage_port_exists(3)- check if a port range is defined in the persistent policy semanage_port_exists_local(3)- check if a port range is defined in the local store semanage_port_query(3)- query a port range in the persistent policy semanage_port_query_local(3)- query a port range in the local store semanage_port_count(3)- count the number of port ranges defined in the persistent policy semanage_port_count_local(3)- count the number of port ranges defined in the local store semanage_port_iterate(3)- execute a callback for each port range in the persistent policy semanage_port_iterate_local(3)- execute a callback for each port range in the local store semanage_port_list(3)- return an array containing all port ranges in the persistent policy semanage_port_list_local(3)- return an array containing all port ranges in the local store ivg2@cornell.edu 16 March 2006 semanage_port(3)
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