1 /* $OpenBSD: print-udpencap.c,v 1.7 2020/01/24 22:46:37 procter Exp $ */
2
3 /*
4 * Copyright (c) 2003 Markus Friedl. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <sys/types.h>
28 #include <stdio.h>
29
30 #include "interface.h"
31
32 void
udpencap_print(const u_char * bp,u_int len,const u_char * bp2)33 udpencap_print(const u_char *bp, u_int len, const u_char *bp2)
34 {
35 u_int32_t *spi;
36
37 /* Recognize NAT-T Keepalive msgs. (draft-ietf-ipsec-udp-encaps-nn) */
38 if (len == 1 && *bp == 0xFF) {
39 printf("NAT-T Keepalive");
40 return;
41 }
42
43 if (len < sizeof(u_int32_t)) {
44 printf("[|udpencap]");
45 return;
46 }
47 printf("udpencap: ");
48 spi = (u_int32_t *)(bp);
49 if (*spi == 0)
50 ike_print(bp + sizeof(u_int32_t), len - sizeof(u_int32_t));
51 else
52 esp_print(bp, len, bp2);
53 }
54