1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */ 2 /* 3 * Copyright 2016 by the Massachusetts Institute of Technology. 4 * All Rights Reserved. 5 * 6 * Export of this software from the United States of America may 7 * require a specific license from the United States Government. 8 * It is the responsibility of any person or organization contemplating 9 * export to obtain such a license before exporting. 10 * 11 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 12 * distribute this software and its documentation for any purpose and 13 * without fee is hereby granted, provided that the above copyright 14 * notice appear in all copies and that both that copyright notice and 15 * this permission notice appear in supporting documentation, and that 16 * the name of M.I.T. not be used in advertising or publicity pertaining 17 * to distribution of the software without specific, written prior 18 * permission. Furthermore if you modify this software you must label 19 * your software as modified software and not distribute it in such a 20 * fashion that it might be confused with the original M.I.T. software. 21 * M.I.T. makes no representations about the suitability of 22 * this software for any purpose. It is provided "as is" without express 23 * or implied warranty. 24 */ 25 26 #ifndef UDPPKTINFO_H 27 #define UDPPKTINFO_H 28 29 #include "k5-int.h" 30 31 /* 32 * This holds whatever additional information might be needed to 33 * properly send back to the client from the correct local address. 34 * 35 * In this case, we only need one datum so far: On macOS, the 36 * kernel doesn't seem to like sending from link-local addresses 37 * unless we specify the correct interface. 38 */ 39 typedef union aux_addressing_info 40 { 41 int ipv6_ifindex; 42 } aux_addressing_info; 43 44 krb5_error_code 45 set_pktinfo(int sock, int family); 46 47 krb5_error_code 48 recv_from_to(int sock, void *buf, size_t len, int flags, 49 struct sockaddr_storage *from, struct sockaddr_storage *to, 50 aux_addressing_info *auxaddr); 51 52 krb5_error_code 53 send_to_from(int sock, void *buf, size_t len, int flags, 54 const struct sockaddr *to, const struct sockaddr *from, 55 aux_addressing_info *auxaddr); 56 57 #endif /* UDPPKTINFO_H */ 58