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Annotation of 43BSDReno/kerberosIV/krb/rd_err.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * $Source: /usr/src/kerberosIV/krb/RCS/rd_err.c,v $
                      3:  * $Author: kfall $
                      4:  *
                      5:  * Copyright 1986, 1987, 1988 by the Massachusetts Institute
                      6:  * of Technology.
                      7:  *
                      8:  * For copying and distribution information, please see the file
                      9:  * <mit-copyright.h>.
                     10:  *
                     11:  * This routine dissects a a Kerberos 'safe msg',
                     12:  * checking its integrity, and returning a pointer to the application
                     13:  * data contained and its length.
                     14:  *
                     15:  * Returns 0 (RD_AP_OK) for success or an error code (RD_AP_...)
                     16:  *
                     17:  * Steve Miller    Project Athena  MIT/DEC
                     18:  */
                     19: 
                     20: #ifndef lint
                     21: static char *rcsid_rd_err_c=
                     22: "$Header: /usr/src/kerberosIV/krb/RCS/rd_err.c,v 4.6 90/06/25 20:57:10 kfall Exp $";
                     23: #endif /* lint */
                     24: 
                     25: #include <mit-copyright.h>
                     26: 
                     27: /* system include files */
                     28: #include <stdio.h>
                     29: #include <errno.h>
                     30: #include <sys/types.h>
                     31: #include <netinet/in.h>
                     32: #include <sys/time.h>
                     33: 
                     34: /* application include files */
                     35: #include <des.h>
                     36: #include <krb.h>
                     37: #include <prot.h>
                     38: 
                     39: /*
                     40:  * Given an AUTH_MSG_APPL_ERR message, "in" and its length "in_length",
                     41:  * return the error code from the message in "code" and the text in
                     42:  * "m_data" as follows:
                     43:  *
                     44:  *     m_data->app_data        points to the error text
                     45:  *     m_data->app_length      points to the length of the error text
                     46:  *
                     47:  * If all goes well, return RD_AP_OK.  If the version number
                     48:  * is wrong, return RD_AP_VERSION, and if it's not an AUTH_MSG_APPL_ERR
                     49:  * type message, return RD_AP_MSG_TYPE.
                     50:  *
                     51:  * The AUTH_MSG_APPL_ERR message format can be found in mk_err.c
                     52:  */
                     53: 
                     54: int
                     55: krb_rd_err(in,in_length,code,m_data)
                     56:     u_char *in;                 /* pointer to the msg received */
                     57:     u_long in_length;           /* of in msg */
                     58:     long *code;                 /* received error code */
                     59:     MSG_DAT *m_data;
                     60: {
                     61:     register u_char *p;
                     62:     int swap_bytes = 0;
                     63:     p = in;                     /* beginning of message */
                     64: 
                     65:     if (*p++ != KRB_PROT_VERSION)
                     66:         return(RD_AP_VERSION);
                     67:     if (((*p) & ~1) != AUTH_MSG_APPL_ERR)
                     68:         return(RD_AP_MSG_TYPE);
                     69:     if ((*p++ & 1) != HOST_BYTE_ORDER)
                     70:         swap_bytes++;
                     71: 
                     72:     /* safely get code */
                     73:     bcopy((char *)p,(char *)code,sizeof(*code));
                     74:     if (swap_bytes)
                     75:         swap_u_long(*code);
                     76:     p += sizeof(*code);         /* skip over */
                     77: 
                     78:     m_data->app_data = p;       /* we're now at the error text
                     79:                                  * message */
                     80:     m_data->app_length = in_length;
                     81: 
                     82:     return(RD_AP_OK);           /* OK == 0 */
                     83: }

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