[25774] in Perl-Users-Digest
Perl-Users Digest, Issue: 8013 Volume: 10
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Mon Apr 25 18:20:55 2005
Date: Mon, 25 Apr 2005 15:20:43 -0700 (PDT)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Mon, 25 Apr 2005 Volume: 10 Number: 8013
Today's topics:
Stumped on using CGI.pm cookie method <>
Re: Stumped on using CGI.pm cookie method <tadmc@augustmail.com>
Re: Stumped on using CGI.pm cookie method <no@adr.com>
Re: Stumped on using CGI.pm cookie method <tadmc@augustmail.com>
Why does variable value change? <no@adr.com>
Re: Why does variable value change? xhoster@gmail.com
Re: Why does variable value change? <axel@white-eagle.invalid.uk>
Re: Why does variable value change? <postmaster@castleamber.com>
Re: Why does variable value change? <postmaster@castleamber.com>
Re: Why does variable value change? <tadmc@augustmail.com>
Re: Why does variable value change? <axel@white-eagle.invalid.uk>
Re: Why does variable value change? <no@adr.com>
Re: Why does variable value change? (Randal L. Schwartz)
Re: Why does variable value change? <tadmc@augustmail.com>
Re: Why does variable value change? <postmaster@castleamber.com>
Re: Why does variable value change? <noreply@gunnar.cc>
Re: Why does variable value change? <tadmc@augustmail.com>
Re: Why does variable value change? <kevin@vaildc.net>
Re: Why does variable value change? <joe@inwap.com>
Re: Why does variable value change? <bart.lateur@pandora.be>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Sun, 24 Apr 2005 15:17:04 -0700
From: Don <>
Subject: Stumped on using CGI.pm cookie method
Message-Id: <d56o61ln5vp06d70j5ptno121ke1cm4mng@4ax.com>
I'm trying to implement a test on the values of two cookies using the CGI.pm
approach to cookies. But, I'm getting the following error that's got me
stumped. I'm real new to Perl, and am doing my best to figure this out. I
sure could use some help with this. Thanks much. -- Don
Error messages in server log:
"Useless use of a constant in void context at wwwboard.pl line 110. Useless
use of a constant in void context at wwwboard.pl line 103"
Note: line 103 is the opening brace on the "if" statement. And, line 110
is the first line of the "eval" statement.
Start of code:
----------------------
# Check to see if client has logged in and passed Username/Password
test.
#
my $query = new CGI;
if(value=>[$query->cookie(-name=>'cpceLoggedInCookie')] ne 'true' or
value=>[$query->cookie(-name=>'cpceUsernamePasswordPassedCookie')] ne
'true')
{
# HTML code to be inserted here.
exit;
}
# Done with login test.
eval {
sub SEEK_SET() { 0; }
} unless defined(&SEEK_SET);
----------------------
End of code
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------------------------------
Date: Sun, 24 Apr 2005 19:50:45 -0500
From: Tad McClellan <tadmc@augustmail.com>
Subject: Re: Stumped on using CGI.pm cookie method
Message-Id: <slrnd6ofn5.p5e.tadmc@magna.augustmail.com>
Don <> wrote:
Please choose one posting address and stick with it.
Thank you.
> I'm trying to implement a test on the values of two cookies using the CGI.pm
Why don't you just copy/paste the sample code given in the module's
documentation and then modify it for your situation?
> Error messages in server log:
> "Useless use of a constant in void context at wwwboard.pl line 110. Useless
> use of a constant in void context at wwwboard.pl line 103"
>
> Note: line 103 is the opening brace on the "if" statement. And, line 110
> is the first line of the "eval" statement.
If you copy/pasted the code you included into a complete program,
then the line numbers would be easier to count "by eye".
Have you seen the Posting Guidelines that are posted here frequently?
> my $query = new CGI;
> if(value=>[$query->cookie(-name=>'cpceLoggedInCookie')] ne 'true' or
That is kind of bizarre, and I wonder why you think it would work.
What did you read that made you think you could do it that way?
It is the same as:
if('value',[$query->cookie(-name=>'cpceLoggedInCookie')] ...
^ ^^
^ ^^
You have put a list into the (boolean) if-clause.
And you are comparing a *reference* to the string "true", that
comparison will always be false, making it into a useless test.
CGI.pm docs give this code:
$riddle = $query->cookie('riddle_name');
So for your situation it would be:
$riddle = $query->cookie('cpceLoggedInCookie');
Then plug it into an if-clause:
if ( $query->cookie('cpceLoggedInCookie') ne 'true' ...
--
Tad McClellan SGML consulting
tadmc@augustmail.com Perl programming
Fort Worth, Texas
------------------------------
Date: Sun, 24 Apr 2005 20:21:24 -0700
From: Don <no@adr.com>
Subject: Re: Stumped on using CGI.pm cookie method
Message-Id: <vgoo61lmsa8h29fv835b1p9papgjj18t9k@4ax.com>
On Sun, 24 Apr 2005 19:50:45 -0500, Tad McClellan <tadmc@augustmail.com>
wrote:
>Don <> wrote:
>
>
>Please choose one posting address and stick with it.
>
>Thank you.
>
>
>> I'm trying to implement a test on the values of two cookies using the CGI.pm
>
>
>Why don't you just copy/paste the sample code given in the module's
>documentation and then modify it for your situation?
>
>
>> Error messages in server log:
>> "Useless use of a constant in void context at wwwboard.pl line 110. Useless
>> use of a constant in void context at wwwboard.pl line 103"
>>
>> Note: line 103 is the opening brace on the "if" statement. And, line 110
>> is the first line of the "eval" statement.
>
>
>If you copy/pasted the code you included into a complete program,
>then the line numbers would be easier to count "by eye".
>
>Have you seen the Posting Guidelines that are posted here frequently?
>
>
>> my $query = new CGI;
>> if(value=>[$query->cookie(-name=>'cpceLoggedInCookie')] ne 'true' or
>
>
>That is kind of bizarre, and I wonder why you think it would work.
>
>What did you read that made you think you could do it that way?
>
>
>It is the same as:
>
> if('value',[$query->cookie(-name=>'cpceLoggedInCookie')] ...
> ^ ^^
> ^ ^^
>
>You have put a list into the (boolean) if-clause.
>
>And you are comparing a *reference* to the string "true", that
>comparison will always be false, making it into a useless test.
>
>CGI.pm docs give this code:
>
> $riddle = $query->cookie('riddle_name');
>
>So for your situation it would be:
>
> $riddle = $query->cookie('cpceLoggedInCookie');
>
>Then plug it into an if-clause:
>
> if ( $query->cookie('cpceLoggedInCookie') ne 'true' ...
Thanks for your help.
Don
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------------------------------
Date: Sun, 24 Apr 2005 23:16:43 -0500
From: Tad McClellan <tadmc@augustmail.com>
Subject: Re: Stumped on using CGI.pm cookie method
Message-Id: <slrnd6orpb.pkq.tadmc@magna.augustmail.com>
Don <no@adr.com> wrote:
> On Sun, 24 Apr 2005 19:50:45 -0500, Tad McClellan <tadmc@augustmail.com>
> wrote:
>
>>Don <> wrote:
>>
>>
>>Please choose one posting address and stick with it.
So is "no@adr.com" going to be the one?
Do you really own or work for adr.com?
It isn't nice to use other's names without permission...
>>Have you seen the Posting Guidelines that are posted here frequently?
Have you done that yet?
> Thanks for your help.
If you really mean that, then please learn how to compose a proper followup.
Soon.
--
Tad McClellan SGML consulting
tadmc@augustmail.com Perl programming
Fort Worth, Texas
------------------------------
Date: Sat, 23 Apr 2005 22:53:07 -0700
From: Don <no@adr.com>
Subject: Why does variable value change?
Message-Id: <k7cm61lgnli1tr6gm1mo43tj25kncgd6up@4ax.com>
I don't have much experience with Perl, so I'm sure the problem is probably
pretty obvious to many of you. But, when I run the following GCI script I
find the "if" tests on "loggedInCookie"/value and
"usernamePasswordPassedCookie"/value both pass the "if". But, the last "if"
shows that both "havelogin" and "haveusernameandpassword" are "false".
What's going on here?
Thanks for any help,
Don
.
.
.
# Check to see if client has logged in and passed Username/Password test.
#
my @cookiepairs=split(/;/, $ENV{'HTTP_COOKIE'});
my ($pair, $name, $value, %cookie);
my $havelogin = 'false';
my $haveusernameandpassword = 'false';
foreach $pair (@cookiepairs)
{
($name, $value) = split(/=/, $pair);
if($name == 'loggedInCookie' and $value == 'true')
{
$havelogin = 'true';
}
if($name == 'usernamePasswordPassedCookie' and $value == 'true')
{
$haveusernameandpassword = 'true';
}
}
if($havelogin == 'false' or $haveusernameandpassword == 'false')
{
# html code will go here stating user not logged in.
exit;
}
# Continue here if login is ok.
.
.
.
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------------------------------
Date: 24 Apr 2005 06:02:57 GMT
From: xhoster@gmail.com
Subject: Re: Why does variable value change?
Message-Id: <20050424020257.531$7H@newsreader.com>
Don <no@adr.com> wrote:
> I don't have much experience with Perl, so I'm sure the problem is
> probably pretty obvious to many of you. But, when I run the following
> GCI script I find the "if" tests on "loggedInCookie"/value and
> "usernamePasswordPassedCookie"/value both pass the "if". But, the last
> "if" shows that both "havelogin" and "haveusernameandpassword" are
> "false". What's going on here?
"==" compares it's arguments for numeric equality. You want "eq", which
compares them for string equality.
> if($havelogin == 'false' or $haveusernameandpassword == 'false')
Xho
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------------------------------
Date: Sun, 24 Apr 2005 01:54:02 -0500
From: Axel <axel@white-eagle.invalid.uk>
Subject: Re: Why does variable value change?
Message-Id: <Y5GdnetVdq8X3_bfRVn-1Q@adelphia.com>
Don <no@adr.com> wrote:
> I don't have much experience with Perl, so I'm sure the problem is probably
> pretty obvious to many of you. But, when I run the following GCI script I
> find the "if" tests on "loggedInCookie"/value and
> "usernamePasswordPassedCookie"/value both pass the "if". But, the last "if"
> shows that both "havelogin" and "haveusernameandpassword" are "false".
> What's going on here?
If you had enabled warnings (as guidelines for this group specifically
mention), the problem would have been made obvious.
Hint: String comparisons and numeric comparisons do not use the same
operator.
Axel
------------------------------
Date: 24 Apr 2005 07:43:44 GMT
From: John Bokma <postmaster@castleamber.com>
Subject: Re: Why does variable value change?
Message-Id: <Xns96421BBA6AD31castleamber@130.133.1.4>
Axel wrote:
> Don <no@adr.com> wrote:
>> I don't have much experience with Perl, so I'm sure the problem is
>> probably pretty obvious to many of you. But, when I run the
>> following GCI script I find the "if" tests on "loggedInCookie"/value
>> and "usernamePasswordPassedCookie"/value both pass the "if". But,
>> the last "if" shows that both "havelogin" and
>> "haveusernameandpassword" are "false". What's going on here?
>
> If you had enabled warnings (as guidelines for this group specifically
> mention), the problem would have been made obvious.
>
> Hint: String comparisons and numeric comparisons do not use the same
> operator.
Is the OP going to:
[1] enable warnings
[2] change the comparison
[3] both
[4] neither
:-D.
--
John Small Perl scripts: http://johnbokma.com/perl/
Perl programmer available: http://castleamber.com/
Happy Customers: http://castleamber.com/testimonials.html
------------------------------
Date: 24 Apr 2005 07:47:35 GMT
From: John Bokma <postmaster@castleamber.com>
Subject: Re: Why does variable value change?
Message-Id: <Xns96421C61932FAcastleamber@130.133.1.4>
Don wrote:
> # Check to see if client has logged in and passed Username/Password
> test. #
> my @cookiepairs=split(/;/, $ENV{'HTTP_COOKIE'});
> my ($pair, $name, $value, %cookie);
> my $havelogin = 'false';
> my $haveusernameandpassword = 'false';
The problem with string constants as used here is that a typo can
introduce behaviour that will take you quite some time to pin down.
> foreach $pair (@cookiepairs)
> {
> ($name, $value) = split(/=/, $pair);
> if($name == 'loggedInCookie' and $value == 'true')
> {
> $havelogin = 'true';
> }
> if($name == 'usernamePasswordPassedCookie' and $value ==
> 'true') {
> $haveusernameandpassword = 'true';
> }
> }
> if($havelogin == 'false' or $haveusernameandpassword == 'false')
> {
> # html code will go here stating user not logged in.
> exit;
> }
> # Continue here if login is ok.
This code gives me the creepy feeling that anyone setting
usernamePasswordPassedCookie to true is logged in...
--
John Small Perl scripts: http://johnbokma.com/perl/
Perl programmer available: http://castleamber.com/
Happy Customers: http://castleamber.com/testimonials.html
------------------------------
Date: Sun, 24 Apr 2005 03:46:31 -0500
From: Tad McClellan <tadmc@augustmail.com>
Subject: Re: Why does variable value change?
Message-Id: <slrnd6mn77.cia.tadmc@magna.augustmail.com>
Don <no@adr.com> wrote:
> I don't have much experience with Perl,
Then you should ask for all the help you can get!
> so I'm sure the problem is probably
> pretty obvious to many of you.
^^^^^^
The problem is even obvious to a _machine_.
If you ask it to, the machine will tell you where your problem is...
> What's going on here?
You aren't working smart.
> if($name == 'loggedInCookie' and $value == 'true')
You should always enable warnings when developing Perl code!
--
Tad McClellan SGML consulting
tadmc@augustmail.com Perl programming
Fort Worth, Texas
------------------------------
Date: Sun, 24 Apr 2005 05:10:55 -0500
From: Axel <axel@white-eagle.invalid.uk>
Subject: Re: Why does variable value change?
Message-Id: <fYCdnWdKaJIy7fbfRVn-2A@adelphia.com>
John Bokma <postmaster@castleamber.com> wrote:
>>> I don't have much experience with Perl, so I'm sure the problem is
>>> probably pretty obvious to many of you. But, when I run the
>>> following GCI script I find the "if" tests on "loggedInCookie"/value
>>> and "usernamePasswordPassedCookie"/value both pass the "if". But,
>>> the last "if" shows that both "havelogin" and
>>> "haveusernameandpassword" are "false". What's going on here?
>> If you had enabled warnings (as guidelines for this group specifically
>> mention), the problem would have been made obvious.
>> Hint: String comparisons and numeric comparisons do not use the same
>> operator.
> Is the OP going to:
>
> [1] enable warnings
> [2] change the comparison
> [3] both
> [4] neither
Who knows? I am going to have a beer :)
Axel
------------------------------
Date: Sun, 24 Apr 2005 07:00:56 -0700
From: Don <no@adr.com>
Subject: Re: Why does variable value change?
Message-Id: <pc9n61hcmmbhhtk2ub7pfrmsluht7f46ru@4ax.com>
On Sun, 24 Apr 2005 01:54:02 -0500, Axel <axel@white-eagle.invalid.uk>
wrote:
>Don <no@adr.com> wrote:
>> I don't have much experience with Perl, so I'm sure the problem is probably
>> pretty obvious to many of you. But, when I run the following GCI script I
>> find the "if" tests on "loggedInCookie"/value and
>> "usernamePasswordPassedCookie"/value both pass the "if". But, the last "if"
>> shows that both "havelogin" and "haveusernameandpassword" are "false".
>> What's going on here?
>
>If you had enabled warnings (as guidelines for this group specifically
>mention), the problem would have been made obvious.
>
>Hint: String comparisons and numeric comparisons do not use the same
>operator.
>
>Axel
I have "use warnings" at the top of the module. But, all I get is "500
server error" when I run the script on the server.
I changed the operators as suggested, but still get that error message, and
no warnings from Perl.
Don
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------------------------------
Date: 24 Apr 2005 07:18:45 -0700
From: merlyn@stonehenge.com (Randal L. Schwartz)
Subject: Re: Why does variable value change?
Message-Id: <86ll78ntq2.fsf@blue.stonehenge.com>
*** post for FREE via your newsreader at post.newsfeed.com ***
>>>>> "Don" == Don <no@adr.com> writes:
(Please don't use "adr.com" if it doesn't belong to you.)
Don> # Check to see if client has logged in and passed Username/Password test.
Don> #
Don> my @cookiepairs=split(/;/, $ENV{'HTTP_COOKIE'});
Please don't do this. Use CGI.pm, and the "cookie" method there.
Otherwise, you will incorrectly declare an encoded value of "%74rue"
to be false, even though technically it's true. (A browser could
choose to hexify every character of an incoming cookie at its
discretion.)
print "Just another Perl hacker,"; # the original!
--
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn@stonehenge.com> <URL:http://www.stonehenge.com/merlyn/>
Perl/Unix/security consulting, Technical writing, Comedy, etc. etc.
See PerlTraining.Stonehenge.com for onsite and open-enrollment Perl training!
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------------------------------
Date: Sun, 24 Apr 2005 12:55:08 -0500
From: Tad McClellan <tadmc@augustmail.com>
Subject: Re: Why does variable value change?
Message-Id: <slrnd6nnbs.o0u.tadmc@magna.augustmail.com>
Don <no@adr.com> wrote:
> I have "use warnings" at the top of the module. But, all I get is "500
> server error" when I run the script on the server.
Did you look in your server logs? That is where STDERR goes
for CGI programs.
Did you try running your program from the command line rather than
from the CGI environment?
Have you read the answser to your Frequently Asked Question already?
perldoc -q 500
My CGI script runs from the command line but not the browser. (500
Server Error)
Have you checked out the Perl FAQs related to CGI programming with Perl?
perldoc -q CGI
Where can I learn about CGI or Web programming in Perl?
How can I get better error messages from a CGI program?
> I changed the operators as suggested, but still get that error message, and
> no warnings from Perl.
Show the code.
Show the messages.
We are not very good mind readers...
--
Tad McClellan SGML consulting
tadmc@augustmail.com Perl programming
Fort Worth, Texas
------------------------------
Date: 24 Apr 2005 23:16:32 GMT
From: John Bokma <postmaster@castleamber.com>
Subject: Re: Why does variable value change?
Message-Id: <Xns9642B9E01CA91castleamber@130.133.1.4>
Axel wrote:
> Who knows? I am going to have a beer :)
Cheers :-D
--
John Small Perl scripts: http://johnbokma.com/perl/
Perl programmer available: http://castleamber.com/
Happy Customers: http://castleamber.com/testimonials.html
------------------------------
Date: Mon, 25 Apr 2005 02:10:12 +0200
From: Gunnar Hjalmarsson <noreply@gunnar.cc>
Subject: Re: Why does variable value change?
Message-Id: <3d2qo8F6qcm2nU1@individual.net>
Randal L. Schwartz wrote:
> Don writes:
>>
>> my @cookiepairs=split(/;/, $ENV{'HTTP_COOKIE'});
>
> Please don't do this. Use CGI.pm, and the "cookie" method there.
> Otherwise, you will incorrectly declare an encoded value of "%74rue"
> to be false, even though technically it's true. (A browser could
> choose to hexify every character of an incoming cookie at its
> discretion.)
Which standard allows browsers to send anything in a Cookie header but
what it once received via a Set-Cookie header?
Do you know of any browser that actually does it?
--
Gunnar Hjalmarsson
Email: http://www.gunnar.cc/cgi-bin/contact.pl
------------------------------
Date: Sun, 24 Apr 2005 19:52:10 -0500
From: Tad McClellan <tadmc@augustmail.com>
Subject: Re: Why does variable value change?
Message-Id: <slrnd6ofpq.p5e.tadmc@magna.augustmail.com>
Don <no@adr.com> wrote:
> Subject: Why does variable value change?
Because if it didn't change, then it wouldn't be "variable",
it would be "constant".
:-)
--
Tad McClellan SGML consulting
tadmc@augustmail.com Perl programming
Fort Worth, Texas
------------------------------
Date: Mon, 25 Apr 2005 01:59:29 GMT
From: Kevin Michael Vail <kevin@vaildc.net>
Subject: Re: Why does variable value change?
Message-Id: <kevin-4CDFD3.21592824042005@news.verizon.net>
In article <slrnd6ofpq.p5e.tadmc@magna.augustmail.com>,
Tad McClellan <tadmc@augustmail.com> wrote:
> Don <no@adr.com> wrote:
>
> > Subject: Why does variable value change?
>
>
> Because if it didn't change, then it wouldn't be "variable",
> it would be "constant".
>
> :-)
But it has to *want* to change.
Oh, wait, wrong joke.
--
Kevin Michael Vail | a billion stars go spinning through the night,
kevin@vaildc.net | blazing high above your head.
. . . . . . . . . | But _in_ you is the presence that
. . . . . . . . | will be, when all the stars are dead.
. . . . . . . . . | (Rainer Maria Rilke)
------------------------------
Date: Sun, 24 Apr 2005 20:39:20 -0700
From: Joe Smith <joe@inwap.com>
Subject: Re: Why does variable value change?
Message-Id: <DKGdnbnG75L0-_HfRVn-3Q@comcast.com>
Randal L. Schwartz wrote:
>>>>>>"Don" == Don <no@adr.com> writes:
> (Please don't use "adr.com" if it doesn't belong to you.)
Don, since your email address is at adr.com, do you work for
JPMorgan Chase Bank or for Thomson Financial?
------------------------------
Date: Mon, 25 Apr 2005 07:26:59 GMT
From: Bart Lateur <bart.lateur@pandora.be>
Subject: Re: Why does variable value change?
Message-Id: <0h5p61thioa8j3ai8veaiv31hc0mhq195e@4ax.com>
Don wrote:
>I have "use warnings" at the top of the module. But, all I get is "500
>server error" when I run the script on the server.
>
>I changed the operators as suggested, but still get that error message, and
>no warnings from Perl.
You don't debug a CGI script by trying to guessthe source of "server
errors". That's like searching for a needle in a haystack. Instead, rely
on Perl's own error messages, in the error log. CGI::Carp's
"fatalsToBrowser" can help, sending error messages to the browser
instead. (but do this only for debugging.)
See Tye McQueen's "warningsToBrowser", to extend the mechanism to
warnings, not just fatal errors.
<http://www.perlmonks.org/?node=115286>
--
Bart.
------------------------------
Date: 6 Apr 2001 21:33:47 GMT (Last modified)
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Subject: Digest Administrivia (Last modified: 6 Apr 01)
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------------------------------
End of Perl-Users Digest V10 Issue 8013
***************************************
