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Full Discussion: Perl- check the port used
Top Forums Shell Programming and Scripting Perl- check the port used Post 302523555 by pludi on Thursday 19th of May 2011 05:41:20 AM
Old 05-19-2011
Reading from a filehandle, such as STDIN, will always read all characters up to and including the new line character(s), and save them to the variable given on the left side. That means when your user inputs (for example) "22" and then hit return, $port will actually contain "22\n" (on Unix) or "22\r\n" on Windows or "22\r" on MacOS. chomp will remove any non-printable characters at the end of the line for you. Try this small script:
Code:
#!/usr/bin/perl

use strict;
use warnings;

print "Enter something: ";
my $input1 = <STDIN>;
print "You wrote >>$input1<<\n";

print "Enter something again: ";
my $input2 = <STDIN>;
chomp $input2;
print "You wrote >>$input2<<\n";

See the difference?

Now when you try to match the contents of $port on line 7, Perl is trying to match (with the example 22 again) ":22<newline>" exactly. Since the port number isn't at the end of netstats output, it will never match.

As for point 3, take a look at the (aptly named) grep function.
This User Gave Thanks to pludi For This Post:
 

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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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