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Old 04-13-2011, 09:55 AM   #1
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Registered: May 2006
Location: Manchester, NH
Distribution: CentOS5.5
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HTML to PHP to EXPECT formatting issue

I'm new to PHP, so I may be missing something obvious or it could be something with the HTML. I wrote an expect script that tests user authentication against a RADIUS server. The username is an email address, including an @ sign. I recently wrote an HTML/PHP front end to allow others to input username/password into a form and then see the results when they hit submit.

Expect code that takes two args username, and password
expect "#"

send    "test aaa group radius [lindex $argv 0] [lindex $argv 1] new-code\r"

expect  "#"
This works fine as far as I can tell, the two input boxes pass the input to the php script
<title>Authentication Test</title>
<form method= "post" action= "authentication.php">
<font size = "5" color = "blue"><b><u>USER AUTHENTICATION TOOL</u></b></font><br /><br />
<input type="text" size="30" maxlength="50" name="unstring"/><br />
<input type="text" size="30" maxlength="50" name="pwstring"/><br /><br />

<input type="submit" value="submit" name="submit"/><br />
</form><br />

This is the php
<?$uname = $_POST['unstring']?>

<?$passw = $_POST['pwstring']?>

<?$output = shell_exec("expect authentication1.exp {$uname} {$passw}")?>

<?echo "<pre>$output</pre>"?>
Every works as it's supposed to, except for the output of the script. When it displays on the webpage, it's segmented weirdly with  all throughout. What I've found is when I remove the @ sign in the username input, it fixes it.

Is there any part of HTML or PHP that treats the @ as a special character? 1 more thing is that I have another HTML/PHP/EXP script that works fine with the @.

Old 04-16-2011, 06:53 AM   #2
Registered: Jan 2007
Location: Canton, MI
Distribution: CentOS, SuSE, Red Hat, Debian, etc.
Posts: 703

Rep: Reputation: 97
I'll bet that you'll need to use addslashes() or stripslashes()
which will handle the escaping of special characters.

I suspect the problem is in the assignment of $passw. Try this
and see if it works.

<?$passw = addslashes($_POST['pwstring'])?>
Old 04-18-2011, 03:46 PM   #3
LQ Newbie
Registered: May 2006
Location: Manchester, NH
Distribution: CentOS5.5
Posts: 13

Original Poster
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I tried wrapping the addslashes and stripslashes tags around the POST variables, but it did not seem to fix the problem. I could have been applying them wrong.

I figured out another way display the results I was looking for, so to solve the strange coding problem I just had the expect script echo something if a regexp were true, instead of the expect script just echo'ing the direct router output.

send    "test aaa group radius [lindex $argv 0] [lindex $argv 1] new-code\r"

                expect  "#"

                set output $expect_out(buffer)

                set hostindex [lindex $output end]

                set hostname [string trim $hostindex "#"]

                if { [regexp -all "User rejected" $output] == "1" } {

                        puts "$hostname = User Rejected\n"

                } elseif { [regexp -all "User successfully authenticated" $output]  == "1" } {

                        puts "$hostname = User successfully authenticated\n"

                } else {

                        puts "$hostname = Unknown Condition\n"


expect, html, php, tcl

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