Writing a guestbook script

1. Free hosting has only what they give.
2. Better, but not necessarily. A decent guest will leave a message as needed (via my form), and good the hacker will still bypass your $_GET, $_POST, $_COOKIE and $HTTP_REFERER too.
3. Length control is performed, but only implicitly, by the database itself (the only thing is that only the message itself can be huge - up to 64Kb).
4. Yes, there is, HtmlSpecialChars was used, I did not use AddSlashes (and this is a big mistake, I admit my fault, see below). With magic_quotes_gpc enabled, this problem is not so acute, but the security hole remains (in the control panel).
5. Yes, I agree, it would be possible to cut it out, but the name #[email protected]%#$^%$ nothing worse than AF4ETX09T43. There is a hole in the e-mail and url, you can use scripts.
6. I wonder what is not uninitialized?

There are a number of interesting tricks, such as protecting against automatic input through an image (as on this site) http://www.site/webmast/php/Security-Images-in-PHP/
...

It seems that there were no pictures, why complicate the demo. So far, I have never met a guest with such protection. As for this site, it is not a guest site.

Anatomy of XSS Cross-Site Scripting
http://www.woweb.ru/index.htm/id/1073393942

Very interesting, thanks.

Z.Y. If Afftor would bother to read (and delve into) the articles on the same site, he would understand how unprofessional his work is. It is worth considering the experience of previous Authors and, at least, respecting their works - they wrote for you.

Where is there no respect? Sorry if I offended anyone.

As for protection, I advise you to read the first paragraph of the article again, I did not set out to consider a reliable guestbook, but only to show how you can write protozoan guestbook, for those who are just starting to learn CGI, because not everything comes right away, you have to start with a simple one, and you didn’t become so smart right away, you also made mistakes, so let’s leave the protection aspects to other articles, other authors.

Yes, in terms of protection, this script is unprofessional, and I am not a professional in the field of protection, which is why the first paragraph contains the corresponding disclaimer, which, unfortunately, not everyone has read.

PS

Quote:

Law "On Copyright and Related Rights"
Article 6. Object of copyright. General provisions
1. Copyright extends to works of science, literature and art, which are the result of creative activity, regardless purpose and merit work, as well as the way it is expressed.
You can read the rest here: http://www.febras.ru/~patent/copyright/2_3part2.html
Including Article 9. p.1
And it's not up to you to decide whether I use my right or not.

A guest book can be a great way for your website visitors to make a permanent impression on their presence on your website without being too intrusive. Before you start thinking about the HTML source for a guestbook, you need to decide how you want it to flow and how you want it look. In this case we will look at a guestbook that places a form for users to sign at the top. Below that there will then be a list of all the comments posted by the readers.

The HTML Source Code

The HTML source for our guestbook will consist of a web form and a list of DIV containers which will hold the display for the signed comments. The Part of the code that will handle the form is a simple as this.

Please Sign Our Guestbook

Right below the form, we will place the comments for other users that have already signed the guestbook and that HTML that handles this looks somewhat like this.

Love your website, I will come back often!!

It was a great experience spending time here, Would love to contribute more!!

Wilbur Right

Great to be a part of what you are doing here!!

Adam Adeve

Wish you all the best and success in your project!

Tony Scott

Keep up the good work!!

The effects of placing these two pieces of HTML code on your Guestbook webpage would be as illustrated in the image shown above on the left.

Making It All Work

As is the custom with HTML, it is not too functional on its own as HTML was designed primarily as a way to handle displays of text and images. To solve this problem, we need to implement some server-side code to process the data collected by the guestbook form. This server-side code could be in any one of a number of programming languages ​​such as PHP, ASP .NET, JSP, or Ruby. Since programming in these languages ​​is beyond the scope of this article, I’m going to use generic, "pseudo" code to represent the server side code and give you an idea of ​​how it might look.

connect to database

if(form submitted)(

insert data into database()

read all guestbook entries from database and order by date descending

while(database entries exist)(

// display entires in this format

print: "

$fullname$
$date$

$message$

."

close connection to database

The pseudo code above simply makes a connection to the database where the data is stored. It then checks to see if the guestbook form has been submitted. If it has, it then enters the data into the database.

The next thing the pseudo code does is read all the guestbook entries from the database and display them to the user right under the web form giving the result as seen in the image above.

Conclusion

There you have it. The HTML source for a guestbook does not get any simpler than that. Guestbooks are one of the easiest and most basic dynamic pages you will ever implement on your website. Of course the guestbook can be styled further and more complex modes of operation and data validation can and should be used to suite the flow of your website. Whichever way you choose to implement the guestbook, the basics as described in the pseudo code remain the same.

Creating a guest book on the site

In previous articles, the creation of a feedback form on the site was considered. Another option for two-way communication with visitors is Guest book, in which visitors leave messages directly on the site page. The site administrator can reply to them, edit, delete, etc. Guest book with its undoubted advantages over the form feedback has one big drawback - it adds worries to the administrator. Now all visitors' messages are visible on the site and sometimes you need to respond to them. In addition, our guests write not only grateful reviews, but also all sorts of indecent things, and they do this with special zeal. Kill these "writers"! Therefore, the guest book must be constantly monitored and educated as hooligans-loafers. An example of a guest book is shown in Figure 1:



Fig.1. One of the guestbook options

There are many options for guest books, paid and free, on the Internet. Sometimes a guest book is included in the list of services provided by hosting. In this case, you just need to place a link to the guest book on your site page and, if desired, customize its interface through the control panel. One trouble - when you change hosting, you will lose the guest book. So it's better to have your own, especially since installing it on the site is as easy as two or two.

Guestbooks can be built with or without databases. In the latter case, the information is stored in a regular file. If you are a supporter simple solutions, then I recommend the second option, that is, to do without creating a database. I liked the guest book developed by Sergey Shestopalov (see his site "Home Scripts"). The site also offers interesting authorings for interactive communication with visitors: forums, guest books, various forms for comments, sending messages, collecting statistics and many other useful things. Be sure to check it out, I recommend it!

For example, consider setting Guest book version 2.0. It provides the following features:

  • message management: deleting, editing, commenting,
  • setup and all work is done through the control panel, that is, you do not need programming knowledge and other intricacies,
  • emoticons, text and color formatting are supported in messages,
  • message preview,
  • there is an Antispam system, Antihacker, blocking users by ip, searching for an intruder by ip,
  • ad protection and security are organized using captcha (input of distorted numbers). You can also make a "black list" of unwanted visitors and a list of prohibited words,
  • fully customizable interface and much more.

Guestbook 2.0 despite its simplicity, it is quite sufficient for most applications. You can download it for free from the corresponding page of Sergey Shestopalov's website. The size of the folder with files after unpacking (name - Book) about 400 Kb.

Let's start installing a guest book on your site:

1. First you need to check that your hosting plan (the office where your site is hosted) supports PHP. If not, then you will most likely have to pay extra to switch to another tariff that supports PHP.

2. Uploading a folder Book to your site, usually in the root directory, through the control panel or via FTP .

3. We put on the necessary page of the site a hyperlink to the guest book - http://www.your_site /book/index.php.

4. It is also advisable to check the permissions for files and folders on your site. The easiest way to do this is through the control panel. Near each folder and file there are icons like rwx, r-x or numbers 755, 644, etc. They just designate access rights for the administrator and guests of the site:
r(or 4) - the right to read data from the file,
w(or 2) - the right to change the contents of the file,
x(or 1) - the right to execute the file.

Digital coding is used to shorten the recording. For example, 7 is equivalent to rwx (4+2+1), and so on. Without going into the details of these abbreviations, since they are usually deciphered in the site control panel manual, check that for folders you have 755 (which corresponds to rwx, rx, rx), and for files 644 (rw-, r--, r--). Usually these values ​​​​are set by default and you do not have to change anything, but it's better to check anyway. As they say, "my neighbor is my friend, but it's better to hide the fat."

That's all! Go to your site, open the page on which you have placed a link to the guest book, follow this link and leave the first message to your loved one.

Now a few words about the maintenance of the guest book. The administrator's session with the guest book begins with authorization - entering the control panel at http://www.your_site/book/admin/index.php. Login and password for the first login admin 111.

Then you can change the password (it is desirable to do this) and start editing posts and replying to them. The interface of the admin panel is extremely friendly and you will easily understand all the functions. All tools are clear and additionally provided with tips. For example, Fig. 2 shows the panel for setting the appearance of the main page of the guest book and expands the list available panels:



Fig.2.

Of course, in exactly the same way as described, you can install more full version Guest book 3.2 Sergei Shestopalov, which has some additional functions: statistics module, the ability to check messages by the administrator before publishing on the site (moderation) and some others.

As I said, on the pages guest book different unwanted "friends" like to leave their messages. Usually they post links to their sites here, hiding behind rave reviews about your site. 99% of the time it's spam. Therefore, I recommend that you exclude entering the site address in messages. To do this, enter the guestbook control panel and on the tab Appearance- The form uncheck "Site" to prevent spammers from using the guest book to post links to their sites. It is better to leave e-mail and ICQ, because sometimes people want to receive a confidential answer, that is, without posting in the guest book. Don't forget to click the "Save" button at the bottom of the page when you're done.

Removing the "Site" item doesn't always help against guestbook clogging and it's best to check posts before posting them. By the way, if there are few messages, then you can simplify the guest book to a regular HTML page. This simplest option is described in

For HTML codes, guestbook programming might seem unchallenging at first, and rightly so. When you see a guestbook, basic information is requested and it appears that anyone with a fundamental knowledge of the HTML programming language can write guestbook HTML codes. However, guestbooks, from the best to the worst, require a bit more skill than you think.

What is a guestbook?

A guestbook is an online way to let visitors to your site comment or request information. Most guestbooks post what is written to the webpage so that everyone can read guest comments. The most common items you see on a guestbook are:

  • Name or Username
  • Where they reside (though you can set the HTML code to hide this fact)
  • Email (again, you can hide this fact and have it sent only to your email for communication purposes
  • Comments
  • Some guestbooks forego a section for a quick survey. You can usually find questions like "What did you think of this site: good, decent, bad, awesome" or "Was the information provided: enough, not enough, just right"
  • Options to request a reply or other information
related articles

Guestbooks can be programmed to send this information to an email address of your choice so that you don't have to continuously log into the site to view guestbook entries.

Where to Find HTML Codes, Guestbook

Whether you know HTML programming, you are a beginning web designer or you simply want a guestbook on your site, using prewritten HTML codes can save you time. The codes you can find online are typically well-tested and provide the most basic programming needed for easy-to-use guestbooks.

  • The code at HTML Comment Box provides the basic outline of an HTML code guestbook. All you need to do is customize the text to your needs and for your domain name. Instructions are provided at the beginning of the page. The code includes lines for name and address.
  • For a large selection of HTML codes and scripts, visit . With such a varied and large selection, you should be able to find one that works into the website you are creating. You can choose from basic guestbooks to more advanced programming that includes drop down menus and code for Macs and Linux machines. The codes are only 30-day free trials, so if you find a set of codes you like you"ll have to pay for the full use.
  • At Freebok you can input some basic information about what text you want on your guestbook and the website will generate the code for you. Afterwards, you can customize the guestbook even more by creating a template and editing the code in Freebok's template layout mode. Other instructions are available on the site to help you with certain links you may need. You do need to sign up for an account in order to use Freebok.
  • To quickly add a guestbook with just a comment box, go to Guestbook Code . The initial code is already generated, but there are five options you can check and uncheck in order to alter the code slightly:
    • Collapse Guest Book. This includes a link that can open and close the guestbook on the webpage you insert it on.
    • Put Guest Book At Top. If this is unchecked, the guestbook and comment box will appear below any entries in the list.
    • Show Submission Date of Entries. This will add a date and time. The time will be the user's local time zone, not yours.
    • Profit Filter. Deletes any profanities that people may write.
    • You can also change the number of comments that are posted to the page for others to read. Minimum is one and maximum is one hundred. It "s recommended that you set it between five to twenty-five.
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