src/protocols/zephyr/ZSendPkt.c

   1 /* This file is part of the Project Athena Zephyr Notification System.
   2  * It contains source for the ZSendPacket function.
   3  *
   4  *      Created by:     Robert French
   5  *
   6  *      $Source$
   7  *      $Author: warmenhoven $
   8  *
   9  *      Copyright (c) 1987,1991 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_ZSendPacket_c[] =
  17     "$Zephyr: /mit/zephyr/src/lib/RCS/ZSendPacket.c,v 1.29 91/03/21 11:57:08 raeburn Exp $";
  18 #endif
  19
  20 #include <internal.h>
  21 #include <sys/socket.h>
  22
  23 static int wait_for_hmack();
  24
  25 Code_t ZSendPacket(packet, len, waitforack)
  26     char *packet;
  27     int len;
  28     int waitforack;
  29 {
  30     Code_t retval;
  31     struct sockaddr_in dest;
  32     ZNotice_t notice, acknotice;
  33
  34     if (!packet || len < 0)
  35         return (ZERR_ILLVAL);
  36
  37     if (len > Z_MAXPKTLEN)
  38         return (ZERR_PKTLEN);
  39
  40     if (ZGetFD() < 0)
  41         if ((retval = ZOpenPort((u_short *)0)) != ZERR_NONE)
  42             return (retval);
  43
  44     dest = ZGetDestAddr();
  45
  46     if (sendto(ZGetFD(), packet, len, 0, (struct sockaddr *)&dest,
  47                sizeof(dest)) < 0)
  48         return (errno);
  49
  50     if (!waitforack)
  51         return (ZERR_NONE);
  52
  53     if ((retval = ZParseNotice(packet, len, &notice)) != ZERR_NONE)
  54         return (retval);
  55
  56     retval = Z_WaitForNotice (&acknotice, wait_for_hmack, &notice.z_uid,
  57                               HM_TIMEOUT);
  58     if (retval == ETIMEDOUT)
  59       return ZERR_HMDEAD;
  60     if (retval == ZERR_NONE)
  61       ZFreeNotice (&acknotice);
  62     return retval;
  63 }
  64
  65 static int wait_for_hmack(notice, uid)
  66     ZNotice_t *notice;
  67     ZUnique_Id_t *uid;
  68 {
  69     return (notice->z_kind == HMACK && ZCompareUID(&notice->z_uid, uid));
  70 }