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You ll recall that the table contains an id field so that each comment can be uniquely identified and that it contains a pageid field, which is a foreign key holding the id of the page to which the comment is associated. The class definition for the comment looks like this: class Comment(object): pass The mapper for the page already takes into account that each page could have multiple comments: orm.mapper(Page, page_table, properties={ 'comments':orm.relation(Comment, backref='page'), 'tags':orm.relation(Tag, secondary=pagetag_table) }) You ll recall that this mapper sets up a .comments property on Page instances for accessing a list of comments, and it also sets up a .page property on Comment instances for identifying the page associated with a comment. If you ve been following the tutorial, you already added these to your model in 8.

Hence, even though host B sends an Are you sure message back to the source address to confirm the delete command, an IP spoofing attack is still possible To make the attack harder, host B can include a nonce, a pseudo-random number intended for one-time use, in the Are you sure message When host B receives the request to delete files, it responds to host A with a confirmation request of the form Are you sure Please echo the random number 3957264392047453759 back if you are sure If host A indeed wanted to delete all files, it would respond with Confirm delete all files confirmation number 3957264392047453759 The point of the nonce is that since host M does not know it (M does not receive the confirmation request), our adversary would not be able to issue a successful confirmation to delete the files.

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databases might not support it at all. This means that the table creation statements might be incompatible.

Let s think about the requirements for the controller. You would need the following actions: view(self, id): Displays a comment for a page new(self): Displays a form to create a new comment on a page create(self): Saves the information submitted from new() and redirects to view() edit(self, id): Displays a form for editing the comment id on a page save(self, id): Saves the comment id and redirects to view() list(self): Displays all comments on a page delete(self, id): Deletes a comment from a page The comment controller actions need to know which page the comment is associated with (or will be associated with in the case of new() and create()) so that they deal with the comments for a particular page only. This means in addition to the ID of the comment the actions are changing, they will also need to know the ID of the page the comment is associated with. With other frameworks, you might have to use hidden fields in your forms and query parameters in your URLs to keep track of the page ID, but Pylons provides a better method: modifying the routes to keep the page ID as part of the URLs used to route requests to the comment controller's actions.

When you have put your data into a database, you need to be able to retrieve it to view it. This is where the SELECT command enters the picture. The command can be used to dump the entire contents of a table, but it can also be instructed to look for specific data, sort it, group it, and perform calculations. Let s start by asking for the entire contents of the names table: SELECT * FROM names This line returns the entire names table, as follows. I have executed additional INSERT statements. The asterisk between the SELECT and FROM works means that you are interested in all columns.

IP spoofing is much easier for non-connection-oriented protocols such as UDP than for connection-oriented protocols like TCP TCP includes a sequence number in packets that is typically used to reorder packets if they arrive from the network out of order However, if an attacker can successfully guess TCP sequence numbers, the attacker may be able to insert packets into a TCP conversation When a TCP connection is established, the operating system chooses a TCP sequence number for the first packet in the conversation If it does not do a good job choosing such a number at random, an attacker may be able to predict the next sequence number that will be used, and can use that information to set up a spoofed TCP connection If you have further interest in IP spoofing, you can read more about it in Robert Morris s paper, A Weakness in the 4.

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