NAME

       ne_set_server_auth, ne_set_proxy_auth, ne_forget_auth - register authentication callbacks

SYNOPSIS

       #include <ne_auth.h>

       typedef int (*ne_auth_creds)(void *userdata, const char *realm, int attempt, char *username,
                                    char *password);

       void ne_set_server_auth(ne_session *session, ne_auth_creds callback, void *userdata);

       void ne_set_proxy_auth(ne_session *session, ne_auth_creds callback, void *userdata);

       void ne_forget_auth(ne_session *session);

DESCRIPTION

       The ne_auth_creds function type defines a callback which is invoked when a server or proxy server
       requires user authentication for a particular request. The realm string is supplied by the server.  The
       attempt is a counter giving the number of times the request has been retried with different
       authentication credentials. The first time the callback is invoked for a particular request, attempt will
       be zero.

       To retry the request using new authentication credentials, the callback should return zero, and the
       username and password buffers must contain NUL-terminated strings. The NE_ABUFSIZ constant gives the size
       of these buffers.

           Tip
           If you only wish to allow the user one attempt to enter credentials, use the value of the attempt
           parameter as the return value of the callback.

       To abort the request, the callback should return a non-zero value; in which case the contents of the
       username and password buffers are ignored.

       The ne_forget_auth function can be used to discard the cached authentication credentials.

EXAMPLES

           /* Function which prompts for a line of user input: */
           extern char *prompt_for(const char *prompt);

           static int
           my_auth(void *userdata, const char *realm, int attempts,
                   char *username, char *password)
           {
              strncpy(username, prompt_for("Username: "), NE_ABUFSIZ);
              strncpy(password, prompt_for("Password: "), NE_ABUFSIZ);
              return attempts;
           }

           int main(...)
           {
              ne_session *sess = ne_session_create(...);

              ne_set_server_auth(sess, my_auth, NULL);

              /* ... */
           }

AUTHOR

       Joe Orton
           Author.

COPYRIGHT