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Full Discussion: Help Generate new port base on the last port but not in used by other application
Top Forums Shell Programming and Scripting Help Generate new port base on the last port but not in used by other application Post 303004407 by lxdorney on Sunday 1st of October 2017 11:07:13 AM
Old 10-01-2017
Help Generate new port base on the last port but not in used by other application
Hi Expert,

Anybody can figure it out on how to generate new port base on my last port let say my last port var1=124 and increment for new port 125,126 but this new two ports need to look at first if this port is not in used by any service, if the port is in used add 1 to new port and if in used again add 1 and soon. let say if the 126 port is in used, the generated output would be 125,128
or
125
128

Here my test simulation script:

Code:
cat /opt/lastports
124

Code:
cat /opt/usedports  #simulation I will used netstat -lntu to look used port
21
22
23
110
111
120
126
127

Code:
#!/bin/sh

clear
echo ""
LASTPORT=$(cat /opt/port/lastports)  #Get the last port
NEWTMPPORT=$(( $LASTPORT + 1 ))  #Get the last port add 1 and sum

#PORTCHECKER=$(netstat -lntu |tail -n +3 |awk '{print $4}' |rev |cut -f1 -d: |rev |sort -u |grep $NEWTMPPORT) # look new temporary port to the list
PORTCHECKER=$(cat /opt/port/usedports | grep $NEWTMPPORT)

if [ "$PORTCHECKER" == "$NEWTMPPORT" ]; then  #if new port is equal to port checker then assign other port
NEWPORT=$(( $NEWTMPPORT + 1 ))

echo "LASTPORT    is $LASTPORT"          #this not importat for checking
echo "NEWTMPPORT  is $NEWTMPPORT"          #this not importat
echo "PORTCHECKER is $PORTCHECKER"          #this not importat
echo "NEWPORT     is $NEWPORT"          #this not importat

else
echo "$NEWPORT Port is available!"
fi

for i in `eval echo {$NEWTMPPORT..$NEWPORT}`
do
echo $i
done

Last edited by lxdorney; 10-01-2017 at 12:19 PM..
 

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LEARN ABOUT CENTOS

sepolicy-network

sepolicy-network(8)													       sepolicy-network(8)

NAME

       sepolicy-network - Examine the SELinux Policy and generate a network report

SYNOPSIS

       sepolicy network [-h] (-l | -a application [application ...] | -p PORT [PORT ...] | -t TYPE [TYPE ...] | -d DOMAIN [DOMAIN ...])

DESCRIPTION

       Use sepolicy network to examine SELinux Policy and generate network reports.

OPTIONS

       -a, --application
	      Generate a report listing the ports to which the specified init application is allowed to connect and or bind.

       -d, --domain
	      Generate a report listing the ports to which the specified domain is allowed to connect and or bind.

       -l, --list
	      List all Network Port Types defined in SELinux Policy

       -h, --help
	      Display help message

       -t, --type
	      Generate a report listing the port numbers associate with the specified SELinux port type.

       -p, --port
	      Generate a report listing the SELinux port types associate with the specified port number.

EXAMPLES

       sepolicy network -p 22
       22: tcp ssh_port_t 22
       22: udp reserved_port_t 1-511
       22: tcp reserved_port_t 1-511

       sepolicy network -a /usr/sbin/sshd
       sshd_t: tcp name_connect
	    111 (portmap_port_t)
	    53 (dns_port_t)
	    88, 750, 4444 (kerberos_port_t)
	    9080 (ocsp_port_t)
	    9180, 9701, 9443-9447 (pki_ca_port_t)
	    32768-61000 (ephemeral_port_t)
	    all ports < 1024 (reserved_port_type)
	    all ports with out defined types (port_t)
       sshd_t: tcp name_bind
	    22 (ssh_port_t)
	    5900-5983, 5985-5999 (vnc_port_t)
	    6000-6020 (xserver_port_t)
	    32768-61000 (ephemeral_port_t)
	    all ports > 500 and  < 1024 (rpc_port_type)
	    all ports with out defined types (port_t)
       sshd_t: udp name_bind
	    32768-61000 (ephemeral_port_t)
	    all ports > 500 and  < 1024 (rpc_port_type)
	    all ports with out defined types (port_t)

AUTHOR

       This man page was written by Daniel Walsh <dwalsh@redhat.com>

SEE ALSO

       sepolicy(8), selinux(8), semanage(8)

								     20121005						       sepolicy-network(8)
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