Free Knowledge Resources


Linux Manual Pages


Free Software * Books

Source Code

Free Media

Linux

libauth(3)


NAME

   libauth - routines for writing nnrpd resolvers and authenticators

SYNOPSIS

       #include "libauth.h"

       struct res_info {
           struct sockaddr *client;
           struct sockaddr *local;
           char *clienthostname;
       };

       struct auth_info {
           char *username;
           char *password;
       };

       struct auth_info *get_auth_info(FILE *);
       struct res_info  *get_res_info (FILE *);

       void free_auth_info(struct auth_info*);
       void free_res_info (struct res_info*);

DESCRIPTION

   These functions provide a convenient C frontend to the nnrpd external
   authentication interface documented in doc/external-auth.  Use of this
   library is not required; in particular, external resolvers and
   authenticators written in languages other than C will need to implement
   the necessary functionality themselves.

   The get_auth_info() and get_res_info() functions allocate sufficient
   memory for a struct auth_info or struct res_info and any necessary
   fields, and return a pointer to the struct with the fields filled in
   from information supplied by nnrpd (the FILE* parameter generally
   should be "stdin").  Both functions return NULL on error.  The caller
   is responsible for deallocating the memory by using the functions
   below.

   The string fields of both structs are straightforward.  The client and
   local fields of struct res_info actually point to instances of struct
   sockaddr_in (or struct sockaddr_in6 if IPv6 support is compiled in).

   The free_auth_info() and free_res_info() functions free the struct
   passed in as argument and all necessary fields.

BUGS

   In many cases, nnrpd provides more information than is normally useful
   (for example, even when calling an authenticator, the resolver
   information is often provided.)  On the other hand, in certain cases it
   provides less information than might be expected (for example, if nnrpd
   is reading from stdin rather than a socket).  The implementation is
   capable of handling at least the first of these issues, but that
   functionality is not exposed in the interface.

   At present, libauth.h and its implementation are located in authprogs/;
   perhaps they should be moved to include/ and lib/, respectively?

HISTORY

   Written by Jeffrey M. Vinocur <jeff@litech.org> for InterNetNews.

   $Id: libauth.pod 8200 2008-11-30 13:31:30Z iulius $

SEE ALSO

   nnrpd(8), readers.conf(5), doc/external-auth



Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.



Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.



Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.



Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.


birds banner