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/*
* Copyright 1986, 1987, 1988 by the Massachusetts Institute
* of Technology.
* For copying and distribution information, please see the file
* <Copyright.MIT>.
*
* This routine dissects a a Kerberos 'safe msg',
* checking its integrity, and returning a pointer to the application
* data contained and its length.
*
* Returns 0 (RD_AP_OK) for success or an error code (RD_AP_...)
*
* Steve Miller Project Athena MIT/DEC
*
* from: rd_err.c,v 4.5 89/01/13 17:26:38 steiner Exp $
* $FreeBSD$
*/
#if 0
#ifndef lint
static char rcsid[] =
"$FreeBSD$";
#endif /* lint */
#endif
/* system include files */
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/time.h>
/* application include files */
#include <krb.h>
#include <prot.h>
/*
* Given an AUTH_MSG_APPL_ERR message, "in" and its length "in_length",
* return the error code from the message in "code" and the text in
* "m_data" as follows:
*
* m_data->app_data points to the error text
* m_data->app_length points to the length of the error text
*
* If all goes well, return RD_AP_OK. If the version number
* is wrong, return RD_AP_VERSION, and if it's not an AUTH_MSG_APPL_ERR
* type message, return RD_AP_MSG_TYPE.
*
* The AUTH_MSG_APPL_ERR message format can be found in mk_err.c
*/
int
krb_rd_err(in,in_length,code,m_data)
u_char *in; /* pointer to the msg received */
u_long in_length; /* of in msg */
long *code; /* received error code */
MSG_DAT *m_data;
{
register u_char *p;
int swap_bytes = 0;
p = in; /* beginning of message */
if (*p++ != KRB_PROT_VERSION)
return(RD_AP_VERSION);
if (((*p) & ~1) != AUTH_MSG_APPL_ERR)
return(RD_AP_MSG_TYPE);
if ((*p++ & 1) != HOST_BYTE_ORDER)
swap_bytes++;
/* safely get code */
bcopy((char *)p,(char *)code,sizeof(*code));
if (swap_bytes)
swap_u_long(*code);
p += sizeof(*code); /* skip over */
m_data->app_data = p; /* we're now at the error text
* message */
m_data->app_length = in_length;
return(RD_AP_OK); /* OK == 0 */
}
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