path: root/lib/include/radsec/radsec.h

/** \file radsec.h
    \brief Public interface for libradsec. */

/* Copyright 2010-2013 NORDUnet A/S. All rights reserved.
   See LICENSE for licensing information. */

#ifndef _RADSEC_RADSEC_H_
#define _RADSEC_RADSEC_H_ 1

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include "compat.h"

enum rs_error_code {
    RSE_OK = 0,
    RSE_NOMEM = 1,
    RSE_NOSYS = 2,
    RSE_INVALID_CTX = 3,
    RSE_INVALID_CONN = 4,
    RSE_CONN_TYPE_MISMATCH = 5,
    RSE_BADADDR = 7,
    RSE_NOPEER = 8,
    RSE_EVENT = 9,		/* libevent error.  */
    RSE_SOCKERR = 10,
    RSE_CONFIG = 11,
    RSE_BADAUTH = 12,
    RSE_INTERNAL = 13,
    RSE_SSLERR = 14,		/* OpenSSL error.  */
    RSE_INVALID_MSG = 15,
    RSE_TIMEOUT_CONN = 16,	/* Connection timeout.  */
    RSE_INVAL = 17,		/* Invalid argument.  */
    RSE_TIMEOUT_IO = 18,	/* I/O timeout.  */
    RSE_TIMEOUT = 19,		/* High level timeout.  */
    RSE_DISCO = 20,
    RSE_INUSE = 21,
    RSE_PACKET_TOO_SMALL = 22,
    RSE_PACKET_TOO_LARGE = 23,
    RSE_ATTR_OVERFLOW = 24,
    RSE_ATTR_TOO_SMALL = 25,
    RSE_ATTR_TOO_LARGE = 26,
    RSE_ATTR_UNKNOWN = 27,
    RSE_ATTR_BAD_NAME = 28,
    RSE_ATTR_VALUE_MALFORMED = 29,
    RSE_ATTR_INVALID = 30,
    RSE_TOO_MANY_ATTRS = 31,
    RSE_ATTR_TYPE_UNKNOWN = 32,
    RSE_MSG_AUTH_LEN = 33,
    RSE_MSG_AUTH_WRONG = 34,
    RSE_REQUEST_REQUIRED = 35,
    RSE_INVALID_REQUEST_CODE = 36,
    RSE_AUTH_VECTOR_WRONG = 37,
    RSE_INVALID_RESPONSE_CODE = 38,
    RSE_INVALID_RESPONSE_ID = 39,
    RSE_INVALID_RESPONSE_SRC = 40,
    RSE_NO_PACKET_DATA = 41,
    RSE_VENDOR_UNKNOWN = 42,
    RSE_CRED = 43,
    RSE_CERT = 44,
    RSE_MAX = RSE_CERT
};

enum rs_conn_type {             /* FIXME: Rename rs_transport_type? */
    RS_CONN_TYPE_NONE = 0,
    RS_CONN_TYPE_UDP,
    RS_CONN_TYPE_TCP,
    RS_CONN_TYPE_TLS,
    RS_CONN_TYPE_DTLS,
};
typedef unsigned int rs_conn_type_t;

typedef enum rs_attr_type_t {
    RS_TYPE_INVALID = 0,		/**< Invalid data type */
    RS_TYPE_STRING,      		/**< printable-text */
    RS_TYPE_INTEGER,     		/**< a 32-bit unsigned integer */
    RS_TYPE_IPADDR,      		/**< an IPv4 address */
    RS_TYPE_DATE,			/**< a 32-bit date, of seconds since January 1, 1970 */
    RS_TYPE_OCTETS,			/**< a sequence of binary octets */
    RS_TYPE_IFID,	     		/**< an Interface Id */
    RS_TYPE_IPV6ADDR,			/**< an IPv6 address */
    RS_TYPE_IPV6PREFIX,			/**< an IPv6 prefix */
    RS_TYPE_BYTE,			/**< an 8-bit integer */
    RS_TYPE_SHORT,			/**< a 16-bit integer */
} rs_attr_type_t;

#define	PW_ACCESS_REQUEST		1
#define	PW_ACCESS_ACCEPT		2
#define	PW_ACCESS_REJECT		3
#define	PW_ACCOUNTING_REQUEST		4
#define	PW_ACCOUNTING_RESPONSE		5
#define	PW_ACCOUNTING_STATUS		6
#define PW_PASSWORD_REQUEST		7
#define PW_PASSWORD_ACK			8
#define PW_PASSWORD_REJECT		9
#define	PW_ACCOUNTING_MESSAGE		10
#define PW_ACCESS_CHALLENGE		11
#define PW_STATUS_SERVER		12
#define PW_STATUS_CLIENT		13
#define PW_DISCONNECT_REQUEST		40
#define PW_DISCONNECT_ACK		41
#define PW_DISCONNECT_NAK		42
#define PW_COA_REQUEST			43
#define PW_COA_ACK			44
#define PW_COA_NAK			45

#if defined (__cplusplus)
extern "C" {
#endif

/* Backwards compatible with 0.0.2. */
#define RSE_INVALID_PKT RSE_INVALID_MSG
#define rs_packet rs_message
#define rs_conn_packet_received_cb rs_conn_message_received_cb
#define rs_conn_packet_sent_cb rs_conn_message_sent_cb
#define rs_conn_receive_packet rs_conn_receive_message
#define rs_dump_packet rs_dump_message
#define rs_packet_append_avp rs_message_append_avp
#define rs_packet_avps rs_message_avps
#define rs_packet_code rs_message_code
#define rs_packet_create rs_message_create
#define rs_packet_create_authn_request rs_message_create_authn_request
#define rs_packet_destroy rs_message_destroy
#define rs_packet_send rs_message_send

/* Data types.  */
struct rs_context;		/* radsec-impl.h */
struct rs_conn_base;            /* radsec-impl.h */
struct rs_connection;		/* radsec-impl.h */
struct rs_listener;             /* radsec-impl.h */
struct rs_message;		/* radsec-impl.h */
struct rs_conn;			/* radsec-impl.h */
struct rs_error;		/* radsec-impl.h */
struct rs_peer;			/* radsec-impl.h */
struct radius_packet;		/* <radius/client.h> */
struct value_pair;		/* <radius/client.h> */
struct event_base;		/* <event2/event-internal.h> */

typedef void *(*rs_calloc_fp) (size_t nmemb, size_t size);
typedef void *(*rs_malloc_fp) (size_t size);
typedef void (*rs_free_fp) (void *ptr);
typedef void *(*rs_realloc_fp) (void *ptr, size_t size);
struct rs_alloc_scheme {
    rs_calloc_fp calloc;
    rs_malloc_fp malloc;
    rs_free_fp free;
    rs_realloc_fp realloc;
};

typedef void (*rs_conn_connected_cb) (void *user_data /* FIXME: peer? */ );
typedef void (*rs_conn_disconnected_cb) (void *user_data /* FIXME: reason? */ );
typedef void (*rs_conn_message_received_cb) (struct rs_message *message,
                                             void *user_data);
typedef void (*rs_conn_message_sent_cb) (void *user_data);
struct rs_conn_callbacks {
    /** Callback invoked when an outgoing connection has been established.  */
    rs_conn_connected_cb connected_cb;
    /** Callback invoked when the connection has been torn down.  */
    rs_conn_disconnected_cb disconnected_cb;
    /** Callback invoked when a message was received.  */
    rs_conn_message_received_cb received_cb;
    /** Callback invoked when a message was successfully sent.  */
    rs_conn_message_sent_cb sent_cb;
};

typedef struct rs_peer *(*rs_listener_client_filter_cb)
    (const struct rs_listener *listener, void *user_data);
typedef void (*rs_listener_new_conn_cb)
    (struct rs_connection *conn, void *user_data);
typedef void (*rs_listener_error_cb)
    (struct rs_connection *conn, void *user_data);
struct rs_listener_callbacks {
    rs_listener_client_filter_cb client_filter_cb;
    rs_listener_new_conn_cb new_conn_cb;
    rs_listener_error_cb error_cb;
};

typedef struct value_pair rs_avp;
typedef const struct value_pair rs_const_avp;

/* Function prototypes.  */

/*************/
/* Context.  */
/*************/
/** Create a context.  Freed by calling \a rs_context_destroy.  Note
    that the context must not be freed before all other libradsec
    objects have been freed.

    \a ctx Address of pointer to a struct rs_context.  This is the
    output of this function.

    \return RSE_OK (0) on success or RSE_NOMEM on out of memory.  */
int rs_context_create(struct rs_context **ctx);

/** Free a context.  Note that the context must not be freed before
    all other libradsec objects have been freed.  */
void rs_context_destroy(struct rs_context *ctx);

/** Set allocation scheme to use.  \a scheme is the allocation scheme
    to use, see \a rs_alloc_scheme.  \return On success, RSE_OK (0) is
    returned.  On error, !0 is returned and a struct \a rs_error is
    pushed on the error stack for the context.  The error can be
    accessed using \a rs_err_ctx_pop.  */
int rs_context_set_alloc_scheme(struct rs_context *ctx,
				struct rs_alloc_scheme *scheme);

/** Read configuration file. \a config_file is the path of the
    configuration file to read.  \return On success, RSE_OK (0) is
    returned.  On error, !0 is returned and a struct \a rs_error is
    pushed on the error stack for the context.  The error can be
    accessed using \a rs_err_ctx_pop.  */
int rs_context_read_config(struct rs_context *ctx, const char *config_file);

int rs_context_print_config (struct rs_context *ctx, char **buf_out);

/*************/
/* Listener. */
/*************/
int rs_listener_create (struct rs_context *ctx,
                        struct rs_listener **listener,
                        const char *config);
void rs_listener_set_callbacks (struct rs_listener *listener,
                                const struct rs_listener_callbacks *cb,
                                void *user_data);
int rs_listener_listen (struct rs_listener *listener);
int rs_listener_dispatch (const struct rs_listener *listener);
int rs_listener_close (struct rs_listener *l);
struct event_base *rs_listener_get_eventbase (const struct rs_listener *l);
int rs_listener_get_fd (const struct rs_listener *l);

/****************/
/* Connection.  */
/****************/
/** Create a connection.  \a conn is the address of a pointer to an \a
    rs_connection, the output.  Free the connection using \a
    rs_conn_destroy.  Note that a connection must not be freed before
    all messages associated with the connection have been freed.  A
    message is associated with a connection when it's created
    (\a rs_message_create) or received (\a rs_conn_receive_message).

    If \a config is not NULL it should be the name of a realm found in
    a config file that has already been read using \a rs_context_read_config.

    \return On success, RSE_OK (0) is returned.  On error, !0 is
    returned and a struct \a rs_error is pushed on the error stack for
    the context.  The error can be accessed using \a
    rs_err_ctx_pop.  */
int rs_conn_create(struct rs_context *ctx,
		   struct rs_connection **conn,
		   const char *config);

/** Not implemented.  */
int rs_conn_add_listener(struct rs_connection *conn,
			 rs_conn_type_t type,
			 const char *hostname,
			 int port);
/** Disconnect connection \a conn.  \return RSE_OK (0) on success, !0
 * on error.  On error, errno is set appropriately.  */
int rs_conn_disconnect (struct rs_connection *conn);

/** Disconnect and free memory allocated for connection \a conn.  Note
    that a connection must not be freed before all messages associated
    with the connection have been freed.  A message is associated with
    a connection when it's created (\a rs_message_create) or received
    (\a rs_conn_receive_message).  \return RSE_OK (0) on success, !0 *
    on error.  On error, errno is set appropriately. */
int rs_conn_destroy(struct rs_connection *conn);

/** Set connection type for \a conn.  */
void rs_conn_set_type(struct rs_connection *conn, rs_conn_type_t type);

/** Not implemented.  */
int rs_conn_set_eventbase(struct rs_connection *conn, struct event_base *eb);

/** Register callbacks \a cb for connection \a conn.  */
void rs_conn_set_callbacks(struct rs_connection *conn,
			   struct rs_conn_callbacks *cb,
                           void *user_data);

/** Remove callbacks for connection \a conn.  */
void rs_conn_del_callbacks(struct rs_connection *conn);

/** Return callbacks registered for connection \a conn.  \return
    Installed callbacks are returned.  */
struct rs_conn_callbacks *rs_conn_get_callbacks(struct rs_connection *conn);

/** Not implemented.  */
int rs_conn_select_peer(struct rs_connection *conn, const char *name);

/** Not implemented.  */
int rs_conn_get_current_peer(struct rs_connection *conn,
			     const char *name,
			     size_t buflen);

/** Special function used in blocking mode, i.e. with no callbacks
    registered.  For any other use of libradsec, a \a received_cb
    callback should be registered using \a rs_conn_set_callbacks.

    If \a req_msg is not NULL, a successfully received RADIUS message
    is verified against it.  If \a pkt_out is not NULL it will upon
    return contain a pointer to an \a rs_message containing the new
    message.

    \return On error or if the connect (TCP only) or read times out,
    \a pkt_out will not be changed and one or more errors are pushed
    on \a conn (available through \a rs_err_conn_pop).  */
int rs_conn_receive_message(struct rs_connection *conn,
                            struct rs_message *request,
                            struct rs_message **pkt_out);

/** Run the dispatcher for the event base associated with \a conn. A
 * wrapper around event_base_dispatch() for not having to hand out the
 * event base. */
int rs_conn_dispatch(struct rs_connection *conn);

#if 0
/** Get the event base associated with connection \a conn.
 * \return struct event_base*. */
struct event_base *rs_conn_get_evb(const struct rs_connection *conn);
#endif

#define rs_conn_fd rs_conn_get_fd /* Old name. */
/** Get the file descriptor associated with connection \a conn.
 * \return File descriptor.  */
int rs_conn_get_fd(struct rs_connection *conn);

/** Set the timeout value for connection \a conn.  */
void rs_conn_set_timeout(struct rs_connection *conn, struct timeval *tv);

/* Peer -- client and server.  */
/** Create a peer and add it to list of peers held by \a conn. */
int rs_peer_create_for_conn (struct rs_connection *conn,
                             struct rs_peer **peer_out);
/** Create a peer and add it to list of peers held by \a listener. */
int rs_peer_create_for_listener (struct rs_listener *listener,
                                 struct rs_peer **peer_out);
/** Set RADIUS secret for \a peer. Free resurces with \a rs_peer_free_secret. */
int rs_peer_set_secret(struct rs_peer *peer, const char *secret);
/** Free resources allocated by \a rs_peer_set_secret. */
void rs_peer_free_secret (struct rs_peer *peer);
int rs_peer_set_address(struct rs_peer *peer,
			const char *hostname,
			const char *service);
void rs_peer_free_address (struct rs_peer *peer);
void rs_peer_set_timeout(struct rs_peer *peer, int timeout);
void rs_peer_set_retries(struct rs_peer *peer, int retries);

/************/
/* Message. */
/************/
/** Create a message associated with connection \a conn.  */
int rs_message_create(struct rs_connection *conn, struct rs_message **pkt_out);

/** Free all memory allocated for message \a msg.  */
void rs_message_destroy(struct rs_message *msg);

/** Send \a msg on the connection associated with \a msg.
    If no callback is registered with the connection
    (\a rs_conn_set_callbacks), the event loop is run by
    \a rs_message_send and it blocks until the message has been
    succesfully sent.

    Note that sending can fail in several ways, f.ex. if the
    transmission protocol in use is connection oriented
    (\a RS_CONN_TYPE_TCP and \a RS_CONN_TYPE_TLS) and the connection
    can not be established.

    Also note that no retransmission is being done. This is required
    for connectionless transport protocols (\a RS_CONN_TYPE_UDP and
    \a RS_CONN_TYPE_DTLS). The "request" API with \a rs_request_send can
    help with this.

    \return On success, RSE_OK (0) is returned. On error, !0 is
    returned and a struct \a rs_error is pushed on the error stack for
    the connection. The error can be accessed using \a rs_err_conn_pop. */
int rs_message_send(struct rs_message *msg);

/** Create a RADIUS authentication request message associated with
    connection \a conn. Optionally, User-Name and User-Password
    attributes are added to the message using the data in \a user_name
    and \a user_pw.
    FIXME: describe what RADIUS shared secret is being used */
int rs_message_create_authn_request(struct rs_connection *conn,
                                    struct rs_message **msg,
                                    const char *user_name,
                                    const char *user_pw);

/*** Append \a tail to message \a msg.  */
int
rs_message_append_avp(struct rs_message *msg,
                      unsigned int attribute, unsigned int vendor,
                      const void *data, size_t data_len);

/*** Get pointer to \a msg attribute value pairs. */
void
rs_message_avps(struct rs_message *msg, rs_avp ***vps);

/*** Get RADIUS message type of \a msg. */
unsigned int
rs_message_code(struct rs_message *msg);

/*** Get RADIUS AVP from \a msg. */
rs_const_avp *
rs_message_find_avp(struct rs_message *msg, unsigned int attr,
                    unsigned int vendor);

/*** Set packet identifier in \a msg; returns old identifier */
int
rs_message_set_id (struct rs_message *msg, int id);

/************/
/* Config.  */
/************/
/** Find the realm named \a name in the configuration file previoiusly
    read in using \a rs_context_read_config.  */
struct rs_realm *rs_conf_find_realm(struct rs_context *ctx, const char *name);

/***********/
/* Error.  */
/***********/
/** Create a struct \a rs_error and push it on a FIFO associated with
    context \a ctx.  Note: The depth of the error stack is one (1) at
    the moment.  This will change in a future release.  */
int rs_err_ctx_push(struct rs_context *ctx, int code, const char *fmt, ...);
int rs_err_ctx_push_fl(struct rs_context *ctx,
		       int code,
		       const char *file,
		       int line,
		       const char *fmt,
		       ...);
/** Pop the first error from the error FIFO associated with context \a
    ctx or NULL if there are no errors in the FIFO.  */
struct rs_error *rs_err_ctx_pop(struct rs_context *ctx);

/** Create a struct \a rs_error and push it on a FIFO associated with
    connection \a conn.  Note: The depth of the error stack is one (1)
    at the moment.  This will change in a future release.  */
int rs_err_conn_push(struct rs_connection *conn,
		     int code,
		     const char *fmt,
		     ...);
int rs_err_conn_push_fl(struct rs_connection *conn,
			int code,
			const char *file,
			int line,
			const char *fmt,
			...);
int rs_err_connbase_push_fl(struct rs_conn_base *connbase,
                            int code,
                            const char *file,
                            int line,
                            const char *fmt,
                            ...);
/** Pop the first error from the error FIFO associated with connection
    \a conn or NULL if there are no errors in the FIFO. */
struct rs_error *rs_err_conn_pop(struct rs_connection *conn);
struct rs_error *rs_err_connbase_pop(struct rs_conn_base *connbase);
struct rs_error *rs_err_listener_pop(struct rs_listener *l);

int rs_err_conn_peek_code (struct rs_connection *conn);
void rs_err_free(struct rs_error *err);
char *rs_err_msg(struct rs_error *err);
int rs_err_code(struct rs_error *err, int dofree_flag);

/************/
/* AVPs.    */
/************/
#define rs_avp_is_string(vp)	  (rs_avp_typeof(vp) == RS_TYPE_STRING)
#define rs_avp_is_integer(vp)	  (rs_avp_typeof(vp) == RS_TYPE_INTEGER)
#define rs_avp_is_ipaddr(vp)	  (rs_avp_typeof(vp) == RS_TYPE_IPADDR)
#define rs_avp_is_date(vp)	  (rs_avp_typeof(vp) == RS_TYPE_DATE)
#define rs_avp_is_octets(vp)	  (rs_avp_typeof(vp) == RS_TYPE_OCTETS)
#define rs_avp_is_ifid(vp)	  (rs_avp_typeof(vp) == RS_TYPE_IFID)
#define rs_avp_is_ipv6addr(vp)	  (rs_avp_typeof(vp) == RS_TYPE_IPV6ADDR)
#define rs_avp_is_ipv6prefix(vp)  (rs_avp_typeof(vp) == RS_TYPE_IPV6PREFIX)
#define rs_avp_is_byte(vp)	  (rs_avp_typeof(vp) == RS_TYPE_BYTE)
#define rs_avp_is_short(vp)	  (rs_avp_typeof(vp) == RS_TYPE_SHORT)
#define rs_avp_is_tlv(vp)	  (rs_avp_typeof(vp) == RS_TYPE_TLV)

/**  The maximum length of a RADIUS attribute.
 *
 *  The RFCs require that a RADIUS attribute transport no more than
 *  253 octets of data.  We add an extra byte for a trailing NUL, so
 *  that the VALUE_PAIR::vp_strvalue field can be handled as a C
 *  string.
 */
#define RS_MAX_STRING_LEN         254

/** Free the AVP list \a vps */
void
rs_avp_free(rs_avp **vps);

/** Return the length of AVP \a vp in bytes */
size_t
rs_avp_length(rs_const_avp *vp);

/** Return the type of \a vp */
rs_attr_type_t
rs_avp_typeof(rs_const_avp *vp);

/** Retrieve the attribute and vendor ID of \a vp */
void
rs_avp_attrid(rs_const_avp *vp, unsigned int *attr, unsigned int *vendor);

/** Add \a vp to the list pointed to by \a head */
void
rs_avp_append(rs_avp **head, rs_avp *vp);

/** Find an AVP in \a vp that matches \a attr and \a vendor */
rs_avp *
rs_avp_find(rs_avp *vp, unsigned int attr, unsigned int vendor);

/** Find an AVP in \a vp that matches \a attr and \a vendor */
rs_const_avp *
rs_avp_find_const(rs_const_avp *vp, unsigned int attr, unsigned int vendor);

/** Alloc a new AVP for \a attr and \a vendor */
rs_avp *
rs_avp_alloc(unsigned int attr, unsigned int vendor);

/** Duplicate existing AVP \a vp */
rs_avp *
rs_avp_dup(rs_const_avp *vp);

/** Remove matching AVP from list \a vps */
int
rs_avp_delete(rs_avp **vps, unsigned int attr, unsigned int vendor);

/** Return next AVP in list */
rs_avp *
rs_avp_next(rs_avp *vp);

/** Return next AVP in list */
rs_const_avp *
rs_avp_next_const(rs_const_avp *avp);

/** Return string value of \a vp */
const char *
rs_avp_string_value(rs_const_avp *vp);

/** Set AVP \a vp to string \a str */
int
rs_avp_string_set(rs_avp *vp, const char *str);

/** Return integer value of \a vp */
uint32_t
rs_avp_integer_value(rs_const_avp *vp);

/** Set AVP \a vp to integer \a val */
int
rs_avp_integer_set(rs_avp *vp, uint32_t val);

/** Return IPv4 value of \a vp */
uint32_t
rs_avp_ipaddr_value(rs_const_avp *vp);

/** Set AVP \a vp to IPv4 address \a in */
int
rs_avp_ipaddr_set(rs_avp *vp, struct in_addr in);

/** Return POSIX time value of \a vp */
time_t
rs_avp_date_value(rs_const_avp *vp);

/** Set AVP \a vp to POSIX time \a date */
int
rs_avp_date_set(rs_avp *vp, time_t date);

/** Return constant pointer to octets in \a vp */
const unsigned char *
rs_avp_octets_value_const_ptr(rs_const_avp *vp);

/** Return pointer to octets in \a vp */
unsigned char *
rs_avp_octets_value_ptr(rs_avp *vp);

/** Retrieve octet pointer \a p and length \a len from \a vp */
int
rs_avp_octets_value_byref(rs_avp *vp,
			  unsigned char **p,
			  size_t *len);

/** Copy octets from \a vp into \a buf and \a len */
int
rs_avp_octets_value(rs_const_avp *vp,
		    unsigned char *buf,
		    size_t *len);

/**
 * Copy octets possibly fragmented across multiple VPs
 * into \a buf and \a len
 */
int
rs_avp_fragmented_value(rs_const_avp *vps,
		        unsigned char *buf,
		        size_t *len);

/** Copy \a len octets in \a buf to AVP \a vp */
int
rs_avp_octets_set(rs_avp *vp,
		  const unsigned char *buf,
		  size_t len);

/** Return IFID value of \a vp */
int
rs_avp_ifid_value(rs_const_avp *vp, uint8_t val[8]);

int
rs_avp_ifid_set(rs_avp *vp, const uint8_t val[8]);

/** Return byte value of \a vp */
uint8_t
rs_avp_byte_value(rs_const_avp *vp);

/** Set AVP \a vp to byte \a val */
int
rs_avp_byte_set(rs_avp *vp, uint8_t val);

/** Return short value of \a vp */
uint16_t
rs_avp_short_value(rs_const_avp *vp);

/** Set AVP \a vp to short integer \a val */
int
rs_avp_short_set(rs_avp *vp, uint16_t val);

/** Display possibly \a canonical attribute name into \a buffer */
int
rs_attr_display_name (unsigned int attr,
                      unsigned int vendor,
                      char *buffer,
                      size_t bufsize,
                      int canonical);

/** Display AVP \a vp into \a buffer */
size_t
rs_avp_display_value(rs_const_avp *vp,
                     char *buffer,
                     size_t buflen);

int
rs_attr_parse_name (const char *name,
		    unsigned int *attr,
		    unsigned int *vendor);

/** Lookup attribute \a name */
int
rs_attr_find(const char *name,
             unsigned int *attr,
             unsigned int *vendor);

/** Return dictionary name for AVP \a vp */
const char *
rs_avp_name(rs_const_avp *vp);

#if defined (__cplusplus)
}
#endif

#endif /* _RADSEC_RADSEC_H_ */

/* Local Variables: */
/* c-file-style: "stroustrup" */
/* End: */