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 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
 /*
  * Copyright 2013 Red Hat, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *    1. Redistributions of source code must retain the above copyright
  *       notice, this list of conditions and the following disclaimer.
  *
  *    2. Redistributions in binary form must reproduce the above copyright
  *       notice, this list of conditions and the following disclaimer in
  *       the documentation and/or other materials provided with the
  *       distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 /*
  * This API is not considered as stable as the main krb5 API.
  *
  * - We may make arbitrary incompatible changes between feature releases
  *   (e.g. from 1.12 to 1.13).
  * - We will make some effort to avoid making incompatible changes for
  *   bugfix releases, but will make them if necessary.
  */
 
 #ifndef KRAD_H_
 #define KRAD_H_
 
 #include <krb5.h>
 #include <verto.h>
 #include <stddef.h>
 #include <stdio.h>
 
 #define KRAD_PACKET_SIZE_MAX 4096
 
 #define KRAD_SERVICE_TYPE_LOGIN 1
 #define KRAD_SERVICE_TYPE_FRAMED 2
 #define KRAD_SERVICE_TYPE_CALLBACK_LOGIN 3
 #define KRAD_SERVICE_TYPE_CALLBACK_FRAMED 4
 #define KRAD_SERVICE_TYPE_OUTBOUND 5
 #define KRAD_SERVICE_TYPE_ADMINISTRATIVE 6
 #define KRAD_SERVICE_TYPE_NAS_PROMPT 7
 #define KRAD_SERVICE_TYPE_AUTHENTICATE_ONLY 8
 #define KRAD_SERVICE_TYPE_CALLBACK_NAS_PROMPT 9
 #define KRAD_SERVICE_TYPE_CALL_CHECK 10
 #define KRAD_SERVICE_TYPE_CALLBACK_ADMINISTRATIVE 11
 
 typedef struct krad_attrset_st krad_attrset;
 typedef struct krad_packet_st krad_packet;
 typedef struct krad_client_st krad_client;
 typedef unsigned char krad_code;
 typedef unsigned char krad_attr;
 
 /* Called when a response is received or the request times out. */
 typedef void
 (*krad_cb)(krb5_error_code retval, const krad_packet *request,
            const krad_packet *response, void *data);
 
 /*
  * Called to iterate over a set of requests.  Either the callback will be
  * called until it returns NULL, or it will be called with cancel = TRUE to
  * terminate in the middle of an iteration.
  */
 typedef const krad_packet *
 (*krad_packet_iter_cb)(void *data, krb5_boolean cancel);
 
 /*
  * Code
  */
 
 /* Convert a code name to its number. Only works for codes defined
  * by RFC 2875 or 2882. Returns 0 if the name was not found. */
 krad_code
 krad_code_name2num(const char *name);
 
 /* Convert a code number to its name. Only works for attributes defined
  * by RFC 2865 or 2882. Returns NULL if the name was not found. */
 const char *
 krad_code_num2name(krad_code code);
 
 /*
  * Attribute
  */
 
 /* Convert an attribute name to its number. Only works for attributes defined
  * by RFC 2865. Returns 0 if the name was not found. */
 krad_attr
 krad_attr_name2num(const char *name);
 
 /* Convert an attribute number to its name. Only works for attributes defined
  * by RFC 2865. Returns NULL if the name was not found. */
 const char *
 krad_attr_num2name(krad_attr type);
 
 /*
  * Attribute set
  */
 
 /* Create a new attribute set. */
 krb5_error_code
 krad_attrset_new(krb5_context ctx, krad_attrset **set);
 
 /* Create a deep copy of an attribute set. */
 krb5_error_code
 krad_attrset_copy(const krad_attrset *set, krad_attrset **copy);
 
 /* Free an attribute set. */
 void
 krad_attrset_free(krad_attrset *set);
 
 /* Add an attribute to a set. */
 krb5_error_code
 krad_attrset_add(krad_attrset *set, krad_attr type, const krb5_data *data);
 
 /* Add a four-octet unsigned number attribute to the given set. */
 krb5_error_code
 krad_attrset_add_number(krad_attrset *set, krad_attr type, krb5_ui_4 num);
 
 /* Delete the specified attribute. */
 void
 krad_attrset_del(krad_attrset *set, krad_attr type, size_t indx);
 
 /* Get the specified attribute. */
 const krb5_data *
 krad_attrset_get(const krad_attrset *set, krad_attr type, size_t indx);
 
 /*
  * Packet
  */
 
 /* Determine the bytes needed from the socket to get the whole packet.  Don't
  * cache the return value as it can change! Returns -1 on EBADMSG. */
 ssize_t
 krad_packet_bytes_needed(const krb5_data *buffer);
 
 /* Free a packet. */
 void
 krad_packet_free(krad_packet *pkt);
 
 /*
  * Create a new request packet.
  *
  * This function takes the attributes specified in set and converts them into a
  * radius packet. The packet will have a randomized id. If cb is not NULL, it
  * will be called passing data as the argument to iterate over a set of
  * outstanding requests. In this case, the id will be both random and unique
  * across the set of requests.
  */
 krb5_error_code
 krad_packet_new_request(krb5_context ctx, const char *secret, krad_code code,
                         const krad_attrset *set, krad_packet_iter_cb cb,
                         void *data, krad_packet **request);
 
 /*
  * Create a new response packet.
  *
  * This function is similar to krad_packet_new_requst() except that it crafts a
  * packet in response to a request packet. This new packet will borrow values
  * from the request such as the id and the authenticator.
  */
 krb5_error_code
 krad_packet_new_response(krb5_context ctx, const char *secret, krad_code code,
                          const krad_attrset *set, const krad_packet *request,
                          krad_packet **response);
 
 /*
  * Decode a request radius packet from krb5_data.
  *
  * The resulting decoded packet will be a request packet stored in *reqpkt.
  *
  * If cb is NULL, *duppkt will always be NULL.
  *
  * If cb is not NULL, it will be called (with the data argument) to iterate
  * over a set of requests currently being processed. In this case, if the
  * packet is a duplicate of an already received request, the original request
  * will be set in *duppkt.
  */
 krb5_error_code
 krad_packet_decode_request(krb5_context ctx, const char *secret,
                            const krb5_data *buffer, krad_packet_iter_cb cb,
                            void *data, const krad_packet **duppkt,
                            krad_packet **reqpkt);
 
 /*
  * Decode a response radius packet from krb5_data.
  *
  * The resulting decoded packet will be a response packet stored in *rsppkt.
  *
  * If cb is NULL, *reqpkt will always be NULL.
  *
  * If cb is not NULL, it will be called (with the data argument) to iterate
  * over a set of requests awaiting responses. In this case, if the response
  * packet matches one of these requests, the original request will be set in
  * *reqpkt.
  */
 krb5_error_code
 krad_packet_decode_response(krb5_context ctx, const char *secret,
                             const krb5_data *buffer, krad_packet_iter_cb cb,
                             void *data, const krad_packet **reqpkt,
                             krad_packet **rsppkt);
 
 /* Encode packet. */
 const krb5_data *
 krad_packet_encode(const krad_packet *pkt);
 
 /* Get the code for the given packet. */
 krad_code
 krad_packet_get_code(const krad_packet *pkt);
 
 /* Get the specified attribute. */
 const krb5_data *
 krad_packet_get_attr(const krad_packet *pkt, krad_attr type, size_t indx);
 
 /*
  * Client
  */
 
 /* Create a new client. */
 krb5_error_code
 krad_client_new(krb5_context kctx, verto_ctx *vctx, krad_client **client);
 
 /* Free the client. */
 void
 krad_client_free(krad_client *client);
 
 /*
  * Send a request to a radius server.
  *
  * The remote host may be specified by one of the following formats:
  *  - /path/to/unix.socket
  *  - IPv4
  *  - IPv4:port
  *  - IPv4:service
  *  - [IPv6]
  *  - [IPv6]:port
  *  - [IPv6]:service
  *  - hostname
  *  - hostname:port
  *  - hostname:service
  *
  * The timeout parameter (milliseconds) is the total timeout across all remote
  * hosts (when DNS returns multiple entries) and all retries.  For stream
  * sockets, the retries parameter is ignored and no retries are performed.
  *
  * The cb function will be called with the data argument when either a response
  * is received or the request times out on all possible remote hosts.
  */
 krb5_error_code
 krad_client_send(krad_client *rc, krad_code code, const krad_attrset *attrs,
                  const char *remote, const char *secret, int timeout,
                  size_t retries, krad_cb cb, void *data);
 
 #endif /* KRAD_H_ */

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