Hi John, Thank you for the ideas :) I am beginning to believe I need a new way to work around this issue.
>gethostbyaddr is a simple reverse-DNS lookup (of the >REMOTE_ADDR ip address) requested by your server to >its nameserver. This never goes near the user's IE or >Netscape browser. >The IP address used is the one your webserver is using >in its HTTP (TCP) connection with the browser (or its >agent -- a firewall or proxy, for example). >If there is no DNS entry for the ip address, there >should be no hostname returned because by definition >there is no host name to be returned. This is exactly the problem, the error is DNS related and has nothing to do with the languages, which is why I get the similar results no matter what I write it in. And yes, they are using proxies as well as rotating ip addresses. The client's team is behind a firewall with a specific domain name but I am not consistently getting that IP address. To make it more complicated, inside their firewall they have rotating ip addresses, and only some of those have DNS entries. I wrote it in JavaScript first, which works in IE if they are indeed using a specific domain name, but not in Netscape, which returns IP addresses with an occasional domain name, not sure why the browsers are so different. So I switched to PHP... Thinking, like you, it would not matter which browser they are using, which helped some, but I am still unable to get domain names from all of their team. No DNS entries listed for some of the IP addresses returned. I am not seeing a way to do it without a consistent DNS entry for each person or at minimum fixed ip addresses. Thank you for helping me walk through it. Alicia -----Original Message----- From: John Hicks [mailto:[EMAIL PROTECTED] Sent: Friday, June 11, 2004 11:35 PM To: PHP Subject: Re: [PHP] gethostbyaddr Hi Alicia. Welcome to the list. On Friday 11 June 2004 12:58 pm, Alicia Riggs wrote: > Hi guys, I am new to this list, and signed up > specifically for this problem. If any one has any > ideas it would be greatly appreciated. > > I am writing a function to allow users from a > specific intranet permission to view a directory. I > am getting very different results from IE and > Netscape. I have written this in JavaScript as well > as PHP, and I am getting the same error in both > languages. Are you talking about regular old (browser-based) Javascript? Javascript and (server-based) PHP are like apples and oranges. You can't really get the same error from each because they are doing completely different things in completely different places. > When I use the gethostbyaddr call, in IE I get a > domain name the majority of the time, with a few > exceptions. When I use the gethostbyaddr call in > Netscape I only receive a domain name if there is a > DNS entry. If there is no DNS entry, Netscape > returns an IP address. PHP functions are executed by the server. The browser (Netscape and IE) have nothing to do with them. gethostbyaddr is a simple reverse-DNS lookup (of the REMOTE_ADDR ip address) requested by your server to its nameserver. This never goes near the user's IE or Netscape browser. The IP address used is the one your webserver is using in its HTTP (TCP) connection with the browser (or its agent -- a firewall or proxy, for example). If there is no DNS entry for the ip address, there should be no hostname returned because by definition there is no host name to be returned. > I am not sure what IE is using to get the domain > names when there is no DNS entry. > > How do I get the correct info to be returned from > Netscape? > > > Here is the code I am using > *********************************** > > <?php > //echo "<pre>"; > //print_r($_SERVER); > //echo "</pre>"; > $hn = gethostbyaddr($_SERVER['REMOTE_ADDR']); > echo "host by addr = " . $hn . "\n<br>"; > $darr = explode(".", $hn); > $cnt = count($darr); > $host = $darr[$cnt - 2] . "." . $darr[$cnt - 1]; > echo "host = " . $host . "\n<br>"; > /* > if($host == "xyz.com") > header("Location: xyz.html"); > else > if($host == "abc.com") > header("Location: abc.html"); > else > header("Location: error.html"); > */ > ?> For debugging purposes, I would add more verbose echos: particularly for IP address and full host name returned ($hn). How are you deducing that you are getting different results based on the user's browser? Are there firewalls or web proxies involved? This could account for getting conflicting IP addresses for the same user reported by the browser (via Javascript) and server. > Thanks in advance for any ideas! > > Alicia Riggs > PSG - Web Development Engineer > 214-550-7452 Hope this helps. Regards, John --------------------------------------- John Hicks Gulfbridge, Inc. "Putting the Web to work for your business." http://gulfbridge.com 561-586-8116 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
