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/*
* lib/krb4/mk_err.c
*
* Copyright 1985, 1986, 1987, 1988, 2000 by the Massachusetts
* Institute of Technology. All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#include "krb.h"
#include "prot.h"
#include <string.h>
/*
* This routine creates a general purpose error reply message. It
* doesn't use KTEXT because application protocol may have long
* messages, and may want this part of buffer contiguous to other
* stuff.
*
* The error reply is built in "p", using the error code "e" and
* error text "e_string" given. The length of the error reply is
* returned.
*
* The error reply is in the following format:
*
* unsigned char KRB_PROT_VERSION protocol version no.
* unsigned char AUTH_MSG_APPL_ERR message type
* (least significant
* bit of above) HOST_BYTE_ORDER local byte order
* 4 bytes e given error code
* string e_string given error text
*/
KRB5_DLLIMP long KRB5_CALLCONV
krb_mk_err(p, e, e_string)
u_char FAR *p; /* Where to build error packet */
KRB4_32 e; /* Error code */
char FAR *e_string; /* Text of error */
{
u_char *start;
size_t e_len;
e_len = strlen(e_string) + 1;
/* Just return the buffer length if p is NULL, because writing to the
* buffer would be a bad idea. Note that this feature is a change from
* previous versions, and can therefore only be used safely in this
* source tree, where we know this function supports it. */
if (p == NULL) {
return 1 + 1 + 4 + e_len;
}
start = p;
/* Create fixed part of packet */
*p++ = KRB_PROT_VERSION;
*p++ = AUTH_MSG_APPL_ERR;
/* Add the basic info */
KRB4_PUT32(p, e);
memcpy(p, e_string, e_len); /* err text */
p += e_len;
/* And return the length */
return p - start;
}
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