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/*
* mk_err.c
*
* Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute
* of Technology.
*
* For copying and distribution information, please see the file
* <mit-copyright.h>.
*/
#include "mit-copyright.h"
#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;
/* 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 2 + sizeof(e) + strlen(e_string);
}
start = p;
/* Create fixed part of packet */
*p++ = (unsigned char) KRB_PROT_VERSION;
*p = (unsigned char) AUTH_MSG_APPL_ERR;
*p++ |= HOST_BYTE_ORDER;
/* Add the basic info */
memcpy((char *)p, (char *)&e, 4); /* err code */
p += sizeof(e);
(void) strcpy((char *)p,e_string); /* err text */
p += strlen(e_string);
/* And return the length */
return p-start;
}
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