how does callback works ??
is it common among authoritization and authentication stuffs for master/slaves communication ??
what are the commonly used "encrytion" libraries just for the authoritization and authentication part ??

//thanks in advance ...


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Callback functions work by passing and saving a pointer to a function that is called on certain events. OpenSSL, for example, is used for many cryptography related stuff, not just authentication.

Are you referring to callback functions, or the practice of having modems return a call to a known host instead of connecting directly?

A callback function is when you write a function to do something, but it is the operating system or sysem library that calls your function. There will usually be a standard method of registering your function so that it will be run. This is a common method of having drivers run userland code, and is also used a lot in GUI frameworks.

I would suggest you read about it in wikipedia for a start. The author will explain it a lot better then I have. http://en.wikipedia.org/wiki/Callbac...ter_science%29

is it ok if using i only use libshadow/libcrypt for "on-disk" type of password challenge for simple program ??

i still have problem figuring out how people do their tunneling ... thanks for your good suggestion , you changed your sig again ... cool ^_^


to jschiwal , thanks for the link ... i usually dont like "wikipedia" kinds of things , but this time ... hmm ... they are not that bad after all ... thanks for the good advice i got my mockup running(at least) now after reading that link ...



//great people we have here ...


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Well yes. You set the program setuid, ask an username, then you do a getspnam() or getpwnam() on systems that return the encrypted password through it. You only have to ask for the password, encrypt it, and then compare it with the hashed version. For the salt to use with crypt(), use the first bytes (it varies from system to system).

Tunneling through SSL ? I still haven't tried it. Browse openssl.org for their howto. There must be tutorials on the web. If you find good stuff, let me know

>> "it varies from system to system ..."

thanks a lot ... will --> more ...



//cheers ...

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