src/protocols/zephyr/ZFmtAuth.c

   1 /* This file is part of the Project Athena Zephyr Notification System.
   2  * It contains source for the ZFormatAuthenticNotice function.
   3  *
   4  *      Created by:     Robert French
   5  *
   6  *      $Source$
   7  *      $Author: warmenhoven $
   8  *
   9  *      Copyright (c) 1987,1988 by the Massachusetts Institute of Technology.
  10  *      For copying and distribution information, see the file
  11  *      "mit-copyright.h".
  12  */
  13 /* $Header$ */
  14
  15 #ifndef lint
  16 static char rcsid_ZFormatAuthenticNotice_c[] = "$Header$";
  17 #endif
  18
  19 #include <internal.h>
  20
  21 #ifdef ZEPHYR_USES_KERBEROS
  22 Code_t ZFormatAuthenticNotice(notice, buffer, buffer_len, len, session)
  23     ZNotice_t *notice;
  24     register char *buffer;
  25     register int buffer_len;
  26     int *len;
  27     C_Block session;
  28 {
  29     ZNotice_t newnotice;
  30     char *ptr;
  31     int retval, hdrlen;
  32
  33     newnotice = *notice;
  34     newnotice.z_auth = 1;
  35     newnotice.z_authent_len = 0;
  36     newnotice.z_ascii_authent = "";
  37
  38     if ((retval = Z_FormatRawHeader(&newnotice, buffer, buffer_len,
  39                                     &hdrlen, &ptr, NULL)) != ZERR_NONE)
  40         return (retval);
  41
  42 #ifdef NOENCRYPTION
  43     newnotice.z_checksum = 0;
  44 #else
  45     newnotice.z_checksum =
  46         (ZChecksum_t)des_quad_cksum(buffer, NULL, ptr - buffer, 0, session);
  47 #endif
  48     if ((retval = Z_FormatRawHeader(&newnotice, buffer, buffer_len,
  49                                     &hdrlen, NULL, NULL)) != ZERR_NONE)
  50         return (retval);
  51
  52     ptr = buffer+hdrlen;
  53
  54     if (newnotice.z_message_len+hdrlen > buffer_len)
  55         return (ZERR_PKTLEN);
  56
  57     (void) memcpy(ptr, newnotice.z_message, newnotice.z_message_len);
  58
  59     *len = hdrlen+newnotice.z_message_len;
  60
  61     if (*len > Z_MAXPKTLEN)
  62         return (ZERR_PKTLEN);
  63
  64     return (ZERR_NONE);
  65 }
  66 #endif