show hidden value in variable.. with mysql

J

joe.henderson1@

joe.henderson1@ wrote in 4ax.com:


But that is tedious because you have to edit the body of each sub to
turn debugging on.
Click to expand...

Yes.. Believe it or not it has saved my A$$ more often than not.
my $item = $_[0];

my ($item) = @_;

would enable you to pass literal strings to this routine as well as
variables.
Click to expand...

K. thanks.. Used a "$tem = shift;" but quit after some problem I don't
remember.. :(

However How would you pass multiple Items..

ex..
########
like ($item) = clean($val1, $val2);

sub clean
{
my $item1 = shift(@_);
my $item2 = shift(@_);
Click to expand...

my ($item1, $item2) = @_;
Click to expand...

k.. I remember that
Or, if you are applying the same transformation to an indefinite number
of arguments:

sub clean {
my @args = @_;
for ( @args ) {
s/^\s+//;
s/\s+$//;
s/\s+/ /;
}
return @args;
}


There is no debug command. I am just proposing setting a global flag for
debugging mode. You could have just as well called it CHEESE.
Click to expand...

I figure that out today when I was testing it.. :p
Well, then, you might want


perldoc perlop

Now, if you do post the contents of those variables, we might be able to
help further.
Click to expand...

Due to the nature of the content I cannot post exact variables... (no
further comment please..)
 
A

A. Sinan Unur

joe.henderson1@ wrote in
.


Due to the nature of the content I cannot post exact variables... (no
further comment please..)
Click to expand...

You can't expect to get help if you don't help those who are in a position
to help you.

Your wish is my command. I won't be seeing any more posts from you.

Sinan

--
A. Sinan Unur <[email protected]>
(remove .invalid and reverse each component for email address)

comp.lang.perl.misc guidelines on the WWW:
http://augustmail.com/~tadmc/clpmisc/clpmisc_guidelines.html
 
J

joe.henderson1@

jh> On Thu, 20 Apr 2006 00:11:16 GMT, "A. Sinan Unur"


jh> All the subs i write have a "magic" debug variable.. I spend more time
jh> on debugging than writting code.. :(

that is a bad sign. learn to analyze your problems better, improve your
coding skills, etc. debugging should be maybe 20-40% maximum of your
development time.
Click to expand...

Statement Noted..
jh> When i turn this on I embed print statments with low level printouts..

jh> if($debug == 1) { print "Entered sub \"clean\"\n"; }
jh> ... magic ...
jh> if($debug == 1) { print "leaving sub returning: \"$ret\"\n"; }

ewww. that is boring sub tracing. and slow in runtime.
Click to expand...

Slow by the use of total compile? Or when the variable "debug" is set
to "1"... I know the printing to STDOUT slows the crunch time
jh> I do not have experience with the debug command... Will use.. thanks
jh> for the advise...


that isn't a debug command. that just create a constant called DEBUG
jh> good idea

it also will run faster than your if you set DEBUG to 0

learn about alternate quote. but even better, why are you using ""
inside a "" string? you can use '', [], <> or {} to demark the actual
values. then you don't need those ugly backwhacks. i tend to use [] for
this.
Click to expand...

True.. Old habits bad to break.
 
J

joe.henderson1@

All,

I run a mysql db 5.0.11. With a table that contains a few columns
defined as type "text" with indexes..

I running this on a Arch Linux 0.7.1.. 2.6.15 custom.. perl 5.8.8

I run some scripts to parse data from cisco/network devices using snmp
and telnet/ssh..

I retrieve the name, mac, serial, location, description, interfaces,
etc..

The problem I have is the names I recieve from the
devices I run threw a "clean subroutine"..

##########
sub clean
{
my $debug = 0;
my $item = $_[0];
$item =~ s/^\s+//; #remove Leading whitespace
$item =~ s/\s+$//; #remove trailing whitespace
$item =~ s/\r/ /g; #remove those Damn ^M
$item =~ s/\f/ /g; #remove those Damn ^M
$item =~ s/\t/ /g; #remove those Damn ^M
$item =~ s/\n/ /g; #remove those Damn ^M
$item =~ s/\s+/ /g; #replace multiple spaces with one
chomp($item); #remove newline character
return $item;
}
##########

And for some reason when I compare to different names

From DB: $name = "00a45fde0032(sw1)"

And the name I pulled from the device $name: "00a45fde0032(sw1)"
and compare them for exact match

##########
if($name eq $mname)
{ print "MATCH ON NAME: \"$name\" MNAME: \"$mname\"\n"; }
else
{ print "NO MATCH\n"; }
##########

Nothing happens.. No Match.


However when I did a
##########
if($name == $mname)
{ print "MATCH ON NAME: \"$name\" MNAME: \"$mname\"\n"; }
else
{ print "NO MATCH\n"; }
##########

I recieved an error stating "cannot equal on non numeric" which is
what I expected.. However it showed a hidden character of
"MNAME: "00a45fde0032(sw1)\o"

What does the "\o" mean? I have never seen this before..

In the variable their has to be hidden characters that I cannot see.

I thought about converting the string to hex then back to see if
any characters show up..

Or "$item =~ s/[^ A-Za-z0-9\-\:\.\(\)\@]//g;"


A note.. I use the "sub clean" for everthing I receive from my
scripts.. And then insert/update/replace into the database..
I don't know if the column type is causing this error or the
devices that are returning the value.. Due to I cannot see the
hidden values...

If their is a better way of "cleaning" the variables please let me
know..



Joe
Click to expand...

All,

Thanks for all your help.. I found out what the problem was...

Their was a hidden "null" in the variable.. hex code of "00"..

This is the sub I wrote that fixes hidden characters...


########################################################
# Sub caschex
#
# USAGE: Removes hidden strings in variables.. Addition to Clean
#
# v1.0.0 -> 2006-04-20
# Born
#
######
# my ($item) = cipdec(1, $ip); #1 = A->H, 2 = H->A ######
#
sub caschex
{
# 1 = ASCII TO HEX
# 2 = HEX TO ASCII

##########
$debug = 0;
##########
if($debug == 1) { print "---------------------------------- ENTERED
SUB: \"caschex\"\n"; }

my $opt = undef; my $item = undef; my $ret = undef; my $val = undef;

$opt = shift(@_);
$item = shift(@_);

if($debug == 1)
{
print "\n\n";
print "OPT: \"$opt\"\n";
print "ITEM: \"$item\"\n";
}

############################# OPT 1
if($opt == 1)
{
if($debug == 1) { print "CONVERT ASCII TO HEX\n"; }

$key = undef; $val = undef;
foreach $key (split//,$item)
{
if($debug == 1) { print "KEY: \"$key\"\n"; }
($key) = sprintf("%02lx", ord $key);
if($debug == 1) { print "HEX KEY: \"$key\"\n"; }

if($key eq "00")
{
if($debug == 1) { print "FOUND NULL IN ASCII VARIABLE...
REPLACE WITH SPACE\n"; }
$key = " ";
#NOTE: A SPACE IN HEX IS "20"
($key) = sprintf("%02lx", ord $key);
if($debug == 1) { print "HEX KEY: \"$key\"\n"; }
}

$val .= $key;
if($debug == 1) { print "VAL: \"$val\"\n"; }
}

if($debug == 1) { print "COMPLETE VAL: \"$val\"\n"; }
}
############################# EO OPT 1

############################# OPT 2
if($opt == 2)
{
if($debug == 1) { print "CONVERT HEX TO ASCII\n"; }

$key = undef; $val = undef;
foreach $key ($item =~ /[a-fA-F0-9]{2}/g)
{
if($debug == 1) { print "HEX KEY: \"$key\"\n"; }

if($key eq "00")
{
if($debug == 1) { print "FOUND NULL IN HEX.. REPLACE WITH
SPACE\n"; }
$key = 20;
if($debug == 1) { print "HEX KEY: \"$key\"\n"; }
}

($key) = chr(hex $key);

if($debug == 1) { print "ASC KEY: \"$key\"\n"; }
$val .= $key;

if($debug == 1) { print "VAL: \"$val\"\n"; }
}
if($debug == 1) { print "COMPLETE VAL: \"$val\"\n"; }
}
############################# EO OPT 2


$ret = $val;

if($debug == 1) { print "RET: \"$ret\"\n"; }
if($debug == 1) { print "---------------------------------- LEAVING
SUB: \"caschex\"\n"; }

$debug = 0;
return($ret);
}
#
#
############################################## EO SUB CASCHEX



I also editted my "clean" sub...


########################################################
# Sub clean
# USAGE: Removes leading and trailing whitespace
#
# HIS: v1.0.5 -> 2005-01-24
# Added to "joes_pm";
#
# HIS: v1.0.6 -> 2005-07-28
# Added to "chomp";
# Added "s/\r/\n/g" for those damn ^Ms..
#
# HIS: v1.0.7 -> 2006-01-18
# Added "s/\s+/ /g" for replace multiple spaces with one
#
# HIS: v1.0.8 -> 2006-04-20
# Added "caschex" sub for removing hidden characters
#
# Usage: line below for results
######
# $line = &clean($line);
######
#
sub clean
{
my $debug = 0;
if($debug == 1) { print "ENTERED SUB \"CLEAN\"\n"; }
my $item = shift(@_);

if($debug == 1) { print "ITEM: \"$item\"\n"; }
$item =~ s/\r/ /g; #remove those Damn ^M
$item =~ s/\f/ /g; #remove those Damn ^M
$item =~ s/\t/ /g; #remove those Damn ^M
$item =~ s/\n/ /g; #remove those Damn ^M

$item = caschex(1, $item); #A->H
if($debug == 1) { print "HEX: \"$item\"\n"; }

$item = caschex(2, $item); #H->A
if($debug == 1) { print "ASCII: \"$item\"\n"; }

$item =~ s/^\s+//; #remove Leading whitespace
$item =~ s/\s+$//; #remove trailing whitespace
$item =~ s/\s+/ /g; #replace multiple spaces with one
chomp($item); #remove newline character


if($debug == 1) { print "RET: \"$item\"\n"; }
if($debug == 1) { print "LEAVING SUB \"CLEAN\"\n"; }
$debug = 0;
return $item;
}
################### EO SUB CLEAN ######################



It turns out the string Pulled from a cisco device from CDP (cdp name
from a snmp oid) has a hidden null character @ the end of the
string...

###
NOTE: The cisco devices I'm referring too are Menu/IOS/Cat based
from every model (around 200 different sysobject oids).

We had a problem with CiscoWorks getting us a complete inventory so I
wrote my own using Net::SNMP, Net::Telnet, DBI, Perl, Mysql 5.x,
Linux/Sun 2.9..
###

I did not see it until I converted it to hex and printed the output...

Their is where the devil was hiding..

When i reran all my scripts with the new subroutine it found hundreds
of instances where "null" characters where hidden in the variables..

Shame I didn't find out this problem until I went to remove duplicates
out of a few tables of mine and that is where I 1st noticed the
problem..

BTW.. In case someone wants to double check my work and has a stash of
cisco products on-hand they can use the following oids..

##########
my $cdpnintoid = ".1.3.6.1.4.1.9.9.23.1.2.1.1.3"; # CDP NEAR
INTERFACE OID
my $cdpfipoid = ".1.3.6.1.4.1.9.9.23.1.2.1.1.4"; # CDP FAR IP
ADD OID
my $cdpfsysdoid = ".1.3.6.1.4.1.9.9.23.1.2.1.1.5"; # CDP FAR
DESCRIPTION
my $cdpfsysnoid = ".1.3.6.1.4.1.9.9.23.1.2.1.1.6"; # CDP FAR
SYSN
my $cdpfintoid = ".1.3.6.1.4.1.9.9.23.1.2.1.1.7"; # CDP FAR
INT
my $cdpfsysmoid = ".1.3.6.1.4.1.9.9.23.1.2.1.1.8"; # CDP FAR
MODEL
##########

########## THe code for dumping the trees
if($debug == 1) { print "\n----- START CDPFSYSNOID\n"; }
$res = undef; $roid = undef;
if(defined($res = $sess->get_table(-baseoid => $cdpfsysnoid)))
{
foreach $roid (keys(%{$res}))
{
$key = undef; $val = undef;
if($debug == 1) { print "ROID: \"$roid\"\n"; }
$val = $res->{$roid};
$val = clean($val);
$val = lc($val);

#ROID: ".1.3.6.1.4.1.9.9.23.1.2.1.1.3.30.1"
@array = split(/\./, $roid);
$key .= "$array[$#array - 1].$array[$#array]";

if($debug == 1)
{
print "KEY: \"$key\"\n";
print "VAL: \"$val\"\n";
print "\n";
}

$key = clean($key);
$key = lc($key);
$key =~ s/\,//g;
$val = clean($val);
$val = lc($val);
$val =~ s/\,//g;
if($val =~ /\./)
{
$val = (split(/\./, $val))[0]; #GET ME THE EVERYTHING B4
THE 1ST PERIOD
}


if(exists $cdpfsysn{$key}) { print "KEY: \"$key\" EXISTS
IN HASH \"CDPFSYSN\".. NEXT\n"; next; }
else { $cdpfsysn{$key} = $val; }

if($debug == 1) { print "\n"; }
} #EO FE ROID

if($debug == 1) { print "--- START DUMP KEY/VAL\n";
$key = undef; $val = undef;
foreach $key (keys %cdpfsysn)
{ print "KEY: \"$key\"\nVAL: \"$cdpfsysn{$key}\"\n\n"; }
print "--- END DUMP KEY/VAL\n"; }

} #EO IF DEF CDPFSYSNOID
if($debug == 1) { print "----- DONE CDPFSYSNOID\n"; }
########## EO The code for dumping the trees

I don't know if the hidden null is vendor specific.. but you never
know....



Thanks again,

Joe
 
J

joe.henderson1@

All,

I run a mysql db 5.0.11. With a table that contains a few columns
defined as type "text" with indexes..

I running this on a Arch Linux 0.7.1.. 2.6.15 custom.. perl 5.8.8

I run some scripts to parse data from cisco/network devices using snmp
and telnet/ssh..

I retrieve the name, mac, serial, location, description, interfaces,
etc..

The problem I have is the names I recieve from the
devices I run threw a "clean subroutine"..

##########
sub clean
{
my $debug = 0;
my $item = $_[0];
$item =~ s/^\s+//; #remove Leading whitespace
$item =~ s/\s+$//; #remove trailing whitespace
$item =~ s/\r/ /g; #remove those Damn ^M
$item =~ s/\f/ /g; #remove those Damn ^M
$item =~ s/\t/ /g; #remove those Damn ^M
$item =~ s/\n/ /g; #remove those Damn ^M
$item =~ s/\s+/ /g; #replace multiple spaces with one
chomp($item); #remove newline character
return $item;
}
##########

And for some reason when I compare to different names

From DB: $name = "00a45fde0032(sw1)"

And the name I pulled from the device $name: "00a45fde0032(sw1)"
and compare them for exact match

##########
if($name eq $mname)
{ print "MATCH ON NAME: \"$name\" MNAME: \"$mname\"\n"; }
else
{ print "NO MATCH\n"; }
##########

Nothing happens.. No Match.


However when I did a
##########
if($name == $mname)
{ print "MATCH ON NAME: \"$name\" MNAME: \"$mname\"\n"; }
else
{ print "NO MATCH\n"; }
##########

I recieved an error stating "cannot equal on non numeric" which is
what I expected.. However it showed a hidden character of
"MNAME: "00a45fde0032(sw1)\o"

What does the "\o" mean? I have never seen this before..

In the variable their has to be hidden characters that I cannot see.

I thought about converting the string to hex then back to see if
any characters show up..

Or "$item =~ s/[^ A-Za-z0-9\-\:\.\(\)\@]//g;"


A note.. I use the "sub clean" for everthing I receive from my
scripts.. And then insert/update/replace into the database..
I don't know if the column type is causing this error or the
devices that are returning the value.. Due to I cannot see the
hidden values...

If their is a better way of "cleaning" the variables please let me
know..



Joe
Click to expand...

All,

Thanks for all your help.. I found out what the problem was...

Their was a hidden "null" in the variable.. hex code of "00"..

This is the sub I wrote that fixes hidden characters...


########################################################
# Sub caschex
#
# USAGE: Removes hidden strings in variables.. Addition to Clean
#
# v1.0.0 -> 2006-04-20
# Born
#
######
# my ($item) = cipdec(1, $ip); #1 = A->H, 2 = H->A ######
#
sub caschex
{
# 1 = ASCII TO HEX
# 2 = HEX TO ASCII

##########
$debug = 0;
##########
if($debug == 1) { print "---------------------------------- ENTERED
SUB: \"caschex\"\n"; }

my $opt = undef; my $item = undef; my $ret = undef; my $val = undef;

$opt = shift(@_);
$item = shift(@_);

if($debug == 1)
{
print "\n\n";
print "OPT: \"$opt\"\n";
print "ITEM: \"$item\"\n";
}

############################# OPT 1
if($opt == 1)
{
if($debug == 1) { print "CONVERT ASCII TO HEX\n"; }

$key = undef; $val = undef;
foreach $key (split//,$item)
{
if($debug == 1) { print "KEY: \"$key\"\n"; }
($key) = sprintf("%02lx", ord $key);
if($debug == 1) { print "HEX KEY: \"$key\"\n"; }

if($key eq "00")
{
if($debug == 1) { print "FOUND NULL IN ASCII VARIABLE...
REPLACE WITH SPACE\n"; }
$key = " ";
#NOTE: A SPACE IN HEX IS "20"
($key) = sprintf("%02lx", ord $key);
if($debug == 1) { print "HEX KEY: \"$key\"\n"; }
}

$val .= $key;
if($debug == 1) { print "VAL: \"$val\"\n"; }
}

if($debug == 1) { print "COMPLETE VAL: \"$val\"\n"; }
}
############################# EO OPT 1

############################# OPT 2
if($opt == 2)
{
if($debug == 1) { print "CONVERT HEX TO ASCII\n"; }

$key = undef; $val = undef;
foreach $key ($item =~ /[a-fA-F0-9]{2}/g)
{
if($debug == 1) { print "HEX KEY: \"$key\"\n"; }

if($key eq "00")
{
if($debug == 1) { print "FOUND NULL IN HEX.. REPLACE WITH
SPACE\n"; }
$key = 20;
if($debug == 1) { print "HEX KEY: \"$key\"\n"; }
}

($key) = chr(hex $key);

if($debug == 1) { print "ASC KEY: \"$key\"\n"; }
$val .= $key;

if($debug == 1) { print "VAL: \"$val\"\n"; }
}
if($debug == 1) { print "COMPLETE VAL: \"$val\"\n"; }
}
############################# EO OPT 2


$ret = $val;

if($debug == 1) { print "RET: \"$ret\"\n"; }
if($debug == 1) { print "---------------------------------- LEAVING
SUB: \"caschex\"\n"; }

$debug = 0;
return($ret);
}
#
#
############################################## EO SUB CASCHEX



I also editted my "clean" sub...


########################################################
# Sub clean
# USAGE: Removes leading and trailing whitespace
#
# HIS: v1.0.5 -> 2005-01-24
# Added to "joes_pm";
#
# HIS: v1.0.6 -> 2005-07-28
# Added to "chomp";
# Added "s/\r/\n/g" for those damn ^Ms..
#
# HIS: v1.0.7 -> 2006-01-18
# Added "s/\s+/ /g" for replace multiple spaces with one
#
# HIS: v1.0.8 -> 2006-04-20
# Added "caschex" sub for removing hidden characters
#
# Usage: line below for results
######
# $line = &clean($line);
######
#
sub clean
{
my $debug = 0;
if($debug == 1) { print "ENTERED SUB \"CLEAN\"\n"; }
my $item = shift(@_);

if($debug == 1) { print "ITEM: \"$item\"\n"; }
$item =~ s/\r/ /g; #remove those Damn ^M
$item =~ s/\f/ /g; #remove those Damn ^M
$item =~ s/\t/ /g; #remove those Damn ^M
$item =~ s/\n/ /g; #remove those Damn ^M

$item = caschex(1, $item); #A->H
if($debug == 1) { print "HEX: \"$item\"\n"; }

$item = caschex(2, $item); #H->A
if($debug == 1) { print "ASCII: \"$item\"\n"; }

$item =~ s/^\s+//; #remove Leading whitespace
$item =~ s/\s+$//; #remove trailing whitespace
$item =~ s/\s+/ /g; #replace multiple spaces with one
chomp($item); #remove newline character


if($debug == 1) { print "RET: \"$item\"\n"; }
if($debug == 1) { print "LEAVING SUB \"CLEAN\"\n"; }
$debug = 0;
return $item;
}
################### EO SUB CLEAN ######################



It turns out the string Pulled from a cisco device from CDP (cdp name
from a snmp oid) has a hidden null character @ the end of the
string...

###
NOTE: The cisco devices I'm referring too are Menu/IOS/Cat based
from every model (around 200 different sysobject oids).

We had a problem with CiscoWorks getting us a complete inventory so I
wrote my own using Net::SNMP, Net::Telnet, DBI, Perl, Mysql 5.x,
Linux/Sun 2.9..
###

I did not see it until I converted it to hex and printed the output...

Their is where the devil was hiding..

When i reran all my scripts with the new subroutine it found hundreds
of instances where "null" characters where hidden in the variables..

Shame I didn't find out this problem until I went to remove duplicates
out of a few tables of mine and that is where I 1st noticed the
problem..

BTW.. In case someone wants to double check my work and has a stash of
cisco products on-hand they can use the following oids..

##########
my $cdpnintoid = ".1.3.6.1.4.1.9.9.23.1.2.1.1.3"; # CDP NEAR
INTERFACE OID
my $cdpfipoid = ".1.3.6.1.4.1.9.9.23.1.2.1.1.4"; # CDP FAR IP
ADD OID
my $cdpfsysdoid = ".1.3.6.1.4.1.9.9.23.1.2.1.1.5"; # CDP FAR
DESCRIPTION
my $cdpfsysnoid = ".1.3.6.1.4.1.9.9.23.1.2.1.1.6"; # CDP FAR
SYSN
my $cdpfintoid = ".1.3.6.1.4.1.9.9.23.1.2.1.1.7"; # CDP FAR
INT
my $cdpfsysmoid = ".1.3.6.1.4.1.9.9.23.1.2.1.1.8"; # CDP FAR
MODEL
##########

########## THe code for dumping the trees
if($debug == 1) { print "\n----- START CDPFSYSNOID\n"; }
$res = undef; $roid = undef;
if(defined($res = $sess->get_table(-baseoid => $cdpfsysnoid)))
{
foreach $roid (keys(%{$res}))
{
$key = undef; $val = undef;
if($debug == 1) { print "ROID: \"$roid\"\n"; }
$val = $res->{$roid};
$val = clean($val);
$val = lc($val);

#ROID: ".1.3.6.1.4.1.9.9.23.1.2.1.1.3.30.1"
@array = split(/\./, $roid);
$key .= "$array[$#array - 1].$array[$#array]";

if($debug == 1)
{
print "KEY: \"$key\"\n";
print "VAL: \"$val\"\n";
print "\n";
}

$key = clean($key);
$key = lc($key);
$key =~ s/\,//g;
$val = clean($val);
$val = lc($val);
$val =~ s/\,//g;
if($val =~ /\./)
{
$val = (split(/\./, $val))[0]; #GET ME THE EVERYTHING B4
THE 1ST PERIOD
}


if(exists $cdpfsysn{$key}) { print "KEY: \"$key\" EXISTS
IN HASH \"CDPFSYSN\".. NEXT\n"; next; }
else { $cdpfsysn{$key} = $val; }

if($debug == 1) { print "\n"; }
} #EO FE ROID

if($debug == 1) { print "--- START DUMP KEY/VAL\n";
$key = undef; $val = undef;
foreach $key (keys %cdpfsysn)
{ print "KEY: \"$key\"\nVAL: \"$cdpfsysn{$key}\"\n\n"; }
print "--- END DUMP KEY/VAL\n"; }

} #EO IF DEF CDPFSYSNOID
if($debug == 1) { print "----- DONE CDPFSYSNOID\n"; }
########## EO The code for dumping the trees

I don't know if the hidden null is vendor specific.. but you never
know....



Thanks again,

Joe
 
J

John W. Krahn

joe.henderson1@ said:
All,

Thanks for all your help.. I found out what the problem was...

Their was a hidden "null" in the variable.. hex code of "00"..
Click to expand...

That's what I thought, it was "\0" and not "\o". :)


John
 
J

joe.henderson1@

That's what I thought, it was "\0" and not "\o". :)
Click to expand...

Hmm... Good point... I did not retain the terminal logs so I'll give
this one to you...

But my question remains... "how did that null value get into that
string"...?
John
Click to expand...


thanks,

Joe
 
T

Tad McClellan

joe.henderson1@ said:
But my question remains... "how did that null value get into that
string"...?
Click to expand...


It was probably put there by a C program somewhere, since C uses
a null byte to mark the end of strings.
 
J

joe.henderson1@

It was probably put there by a C program somewhere, since C uses
a null byte to mark the end of strings.
Click to expand...

Well.. I talked with cisco today (tac) and they confirmed that
the IOS code is written in C..

However they are unsure of why the null string appears in the sysname
for the devices..

Thanks

Joe Henderson
 

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