X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/bbc1cfa669a5f51ed26bae3784447076e3fbc80f..c39d40a767a1ae36171e5bcbf6f157ff3e80fb6c:/print-enc.c

diff --git a/print-enc.c b/print-enc.c
index e3c2ad73..9f541c3c 100644
--- a/print-enc.c
+++ b/print-enc.c
@@ -21,58 +21,140 @@
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
-#ifndef lint
-static const char rcsid[] _U_ =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-enc.c,v 1.3 2003-11-16 09:36:20 guy Exp $ (LBL)";
-#endif
+/* \summary: OpenBSD IPsec encapsulation BPF layer printer */
 
 #ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
 #endif
 
-#include <tcpdump-stdinc.h>
+#include "netdissect-stdinc.h"
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
+#include "af.h"
+
+/* From $OpenBSD: if_enc.h,v 1.8 2001/06/25 05:14:00 angelos Exp $ */
+/*
+ * The authors of this code are John Ioannidis (ji@tla.org),
+ * Angelos D. Keromytis (kermit@csd.uch.gr) and
+ * Niels Provos (provos@physnet.uni-hamburg.de).
+ *
+ * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
+ * in November 1995.
+ *
+ * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
+ * by Angelos D. Keromytis.
+ *
+ * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
+ * and Niels Provos.
+ *
+ * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
+ * and Niels Provos.
+ * Copyright (c) 2001, Angelos D. Keromytis.
+ *
+ * Permission to use, copy, and modify this software with or without fee
+ * is hereby granted, provided that this entire notice is included in
+ * all copies of any software which is or includes a copy or
+ * modification of this software.
+ * You may use this code under the GNU public license if you so wish. Please
+ * contribute changes back to the authors under this freer than GPL license
+ * so that we may further the use of strong encryption without limitations to
+ * all.
+ *
+ * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
+ * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
+ * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
+ * PURPOSE.
+ */
 
-#include <pcap.h>
+#define ENC_HDRLEN	12
 
-#include "interface.h"
-#include "addrtoname.h"
+/* From $OpenBSD: mbuf.h,v 1.56 2002/01/25 15:50:23 art Exp $	*/
+#define M_CONF		0x0400  /* packet was encrypted (ESP-transport) */
+#define M_AUTH		0x0800  /* packet was authenticated (AH) */
 
-#include "enc.h"
+struct enchdr {
+	nd_uint32_t af;
+	nd_uint32_t spi;
+	nd_uint32_t flags;
+};
 
-#define ENC_PRINT_TYPE(wh, xf, nam) \
+#define ENC_PRINT_TYPE(wh, xf, name) \
 	if ((wh) & (xf)) { \
-		printf("%s%s", nam, (wh) == (xf) ? "): " : ","); \
+		ND_PRINT("%s%s", name, (wh) == (xf) ? "): " : ","); \
 		(wh) &= ~(xf); \
 	}
 
-u_int
-enc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
+/*
+ * Byte-swap a 32-bit number.
+ * ("htonl()" or "ntohl()" won't work - we want to byte-swap even on
+ * big-endian platforms.)
+ */
+#define	SWAPLONG(y) \
+((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
+
+void
+enc_if_print(netdissect_options *ndo,
+             const struct pcap_pkthdr *h, const u_char *p)
 {
-	register u_int length = h->len;
-	register u_int caplen = h->caplen;
-	int flags;
+	u_int length = h->len;
+	u_int caplen = h->caplen;
+	u_int af, flags;
 	const struct enchdr *hdr;
 
-	if (caplen < ENC_HDRLEN) {
-		printf("[|enc]");
-		goto out;
+	ndo->ndo_protocol = "enc";
+	ND_TCHECK_LEN(p, ENC_HDRLEN);
+	ndo->ndo_ll_hdr_len += ENC_HDRLEN;
+
+	hdr = (const struct enchdr *)p;
+	/*
+	 * The address family and flags fields are in the byte order
+	 * of the host that originally captured the traffic.
+	 *
+	 * To determine that, look at the address family.  It's 32-bit,
+	 * it is not likely ever to be > 65535 (I doubt there will
+	 * ever be > 65535 address families and, so far, AF_ values have
+	 * not been allocated very sparsely) so it should not have the
+	 * upper 16 bits set, and it is not likely ever to be AF_UNSPEC,
+	 * i.e. it's not likely ever to be 0, so if it's byte-swapped,
+	 * it should have at least one of the upper 16 bits set.
+	 *
+	 * So if any of the upper 16 bits are set, we assume it, and
+	 * the flags field, are byte-swapped.
+	 *
+	 * The SPI field is always in network byte order, i.e. big-
+	 * endian.
+	 */
+	UNALIGNED_MEMCPY(&af, &hdr->af, sizeof (af));
+	UNALIGNED_MEMCPY(&flags, &hdr->flags, sizeof (flags));
+	if ((af & 0xFFFF0000) != 0) {
+		af = SWAPLONG(af);
+		flags = SWAPLONG(flags);
 	}
 
-	hdr = (struct enchdr *)p;
-	flags = hdr->flags;
 	if (flags == 0)
-		printf("(unprotected): ");
+		ND_PRINT("(unprotected): ");
 	else
-		printf("(");
+		ND_PRINT("(");
 	ENC_PRINT_TYPE(flags, M_AUTH, "authentic");
 	ENC_PRINT_TYPE(flags, M_CONF, "confidential");
 	/* ENC_PRINT_TYPE(flags, M_TUNNEL, "tunnel"); */
-	printf("SPI 0x%08x: ", (u_int32_t)ntohl(hdr->spi));
+	ND_PRINT("SPI 0x%08x: ", GET_BE_U_4(hdr->spi));
 
 	length -= ENC_HDRLEN;
-	/* XXX - use the address family */
-	ip_print(p + ENC_HDRLEN, length);
+	caplen -= ENC_HDRLEN;
+	p += ENC_HDRLEN;
 
-out:
-	return (ENC_HDRLEN);
+	switch (af) {
+	case BSD_AFNUM_INET:
+		ip_print(ndo, p, length);
+		break;
+	case BSD_AFNUM_INET6_BSD:
+	case BSD_AFNUM_INET6_FREEBSD:
+	case BSD_AFNUM_INET6_DARWIN:
+		ip6_print(ndo, p, length);
+		break;
+	}
 }