[Heimdal-source-changes] [heimdal/heimdal] 98a1e6: krb5_sendto_kdc: Windows no KDC reachable error

[Jeffrey Altman]

  Branch: refs/heads/heimdal-7.6.0-fix
  Home:   https://github.com/heimdal/heimdal
  Commit: 98a1e630e96ec60c8cb4050ab7db3f77dcba4d58
      https://github.com/heimdal/heimdal/commit/98a1e630e96ec60c8cb4050ab7db3f77dcba4d58
  Author: Jeffrey Altman <jaltman at secure-endpoints.com>
  Date:   2019-05-16 (Thu, 16 May 2019)

  Changed paths:
    M lib/krb5/send_to_kdc.c

  Log Message:
  -----------
  krb5_sendto_kdc: Windows no KDC reachable error

The combination of 8740528b2477f872147998ca19a66d2fae12631b
("Windows-compatible sentinel socket type and value") and
d497d7e4a796c6bda153e7f10fe9478724b855ab ("krb5_sendto_kdc:
failover for multiple AAAA/A RRs on one domain") broke
all the send to kdc loop on Windows.  rk_socket_t is
a HANDLE and rk_INVALID_SOCKET is the max value.  Therefore,
no valid socket will be larger and all communications
will fail.

Change-Id: I3464f78d67b19f14050ad7a01738fb32bac99385
(cherry picked from commit a1276c54aaebb0c6e71b3347ba2a49cb27d0c5ee)