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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

release

UMAD_GET_PORT(3)					    OpenIB Programmer's Manual						  UMAD_GET_PORT(3)

NAME

       umad_get_port, umad_release_port - open and close an InfiniBand port

SYNOPSIS

       #include <infiniband/umad.h>

       int umad_get_port(char *ca_name, int portnum, umad_port_t *port);
       int umad_release_port(umad_port_t *port);

DESCRIPTION

       umad_get_port()	fills  the port structure with the IB port attributes specified by ca_name and portnum , or the default port if ca_name is
       NULL and portnum is zero. If only one of ca_name and portnum are specified, the other is used as a filter.  For	example,  passing  a  NULL
       ca_name	and  2 for the portnum means get a port from any of the local IB devices, as long as it is the second port.  Note that the library
       may use some reference scheme to support port caching therefore umad_release_port() should be called before the port structure can be deal-
       located.  The argument port is an umad_port_t struct, as specified in <infiniband/umad.h>.

       typedef struct umad_port {
	       char ca_name[UMAD_CA_NAME_LEN];		       /* Name of the device */
	       int portnum;				       /* Physical port number */
	       uint base_lid;				       /* Base port LID */
	       uint lmc;				       /* LMC of LID */
	       uint sm_lid;				       /* SM LID */
	       uint sm_sl;				       /* SM service level */
	       uint state;				       /* Logical port state */
	       uint phys_state; 			       /* Physical port state */
	       uint rate;				       /* Port link bit rate */
	       uint64_t capmask;			       /* Port capabilities */
	       uint64_t gid_prefix;			       /* Gid prefix of this port */
	       uint64_t port_guid;			       /* GUID of this port */
       } umad_port_t;

       umad_release_port() releases the resources that were allocated by the umad_get_port() function for the specified IB port.

RETURN VALUE

       umad_get_port() and umad_release_port() return 0 on success, and a negative value on error.

AUTHORS

       Hal Rosenstock <halr@voltaire.com>

       Dotan Barak <dotanb@mellanox.co.il>

OpenIB								   May 21, 2007 						  UMAD_GET_PORT(3)
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