80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/*
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* Copyright 1986, 1987, 1988 by the Massachusetts Institute
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* of Technology.
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* For copying and distribution information, please see the file
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* <Copyright.MIT>.
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*
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* This routine dissects a a Kerberos 'safe msg',
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* checking its integrity, and returning a pointer to the application
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* data contained and its length.
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*
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* Returns 0 (RD_AP_OK) for success or an error code (RD_AP_...)
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*
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* Steve Miller Project Athena MIT/DEC
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*
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* from: rd_err.c,v 4.5 89/01/13 17:26:38 steiner Exp $
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* $Id: rd_err.c,v 1.2 1994/07/19 19:26:10 g89r4222 Exp $
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*/
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#ifndef lint
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static char rcsid[] =
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"$Id: rd_err.c,v 1.2 1994/07/19 19:26:10 g89r4222 Exp $";
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#endif /* lint */
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/* system include files */
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#include <stdio.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <sys/time.h>
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/* application include files */
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#include <krb.h>
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#include <prot.h>
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/*
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* Given an AUTH_MSG_APPL_ERR message, "in" and its length "in_length",
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* return the error code from the message in "code" and the text in
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* "m_data" as follows:
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*
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* m_data->app_data points to the error text
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* m_data->app_length points to the length of the error text
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*
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* If all goes well, return RD_AP_OK. If the version number
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* is wrong, return RD_AP_VERSION, and if it's not an AUTH_MSG_APPL_ERR
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* type message, return RD_AP_MSG_TYPE.
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*
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* The AUTH_MSG_APPL_ERR message format can be found in mk_err.c
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*/
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int
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krb_rd_err(in,in_length,code,m_data)
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u_char *in; /* pointer to the msg received */
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u_long in_length; /* of in msg */
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long *code; /* received error code */
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MSG_DAT *m_data;
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{
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register u_char *p;
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int swap_bytes = 0;
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p = in; /* beginning of message */
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if (*p++ != KRB_PROT_VERSION)
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return(RD_AP_VERSION);
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if (((*p) & ~1) != AUTH_MSG_APPL_ERR)
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return(RD_AP_MSG_TYPE);
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if ((*p++ & 1) != HOST_BYTE_ORDER)
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swap_bytes++;
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/* safely get code */
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bcopy((char *)p,(char *)code,sizeof(*code));
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if (swap_bytes)
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swap_u_long(*code);
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p += sizeof(*code); /* skip over */
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m_data->app_data = p; /* we're now at the error text
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* message */
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m_data->app_length = in_length;
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return(RD_AP_OK); /* OK == 0 */
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}
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