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libauth(3)		  InterNetNews Documentation		    libauth(3)

       libauth - routines for writing nnrpd resolvers and authenticators

	   #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*);

       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

       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.

       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?

       Written by Jeffrey M. Vinocur <> for InterNetNews.

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

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

INN 2.6.3			  2015-09-12			    libauth(3)


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