X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/8b67f771343e94182b048b0cae3ffe164dc37bb9..0023eaa78f123676bfa9c5fba72ea4b8a59aaa70:/print-ah.c

diff --git a/print-ah.c b/print-ah.c
index a4238899..3b3a7921 100644
--- a/print-ah.c
+++ b/print-ah.c
@@ -21,75 +21,53 @@
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
-#ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-ah.c,v 1.9 2000-09-28 06:42:55 guy Exp $ (LBL)";
-#endif
+/* \summary: IPSEC Authentication Header printer */
 
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#include <config.h>
 
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/socket.h>
+#include "netdissect-stdinc.h"
 
-#include <net/route.h>
+#include "netdissect.h"
+#include "extract.h"
 
-#include <netinet/in.h>
-#include <netinet/in_systm.h>
-
-#include <stdio.h>
-
-/* there's no standard definition so we are on our own */
-struct ah {
-	u_int8_t	ah_nxt;		/* Next Header */
-	u_int8_t	ah_len;		/* Length of data, in 32bit */
-	u_int16_t	ah_reserve;	/* Reserved for future use */
-	u_int32_t	ah_spi;		/* Security parameter index */
-	/* variable size, 32bit bound*/	/* Authentication data */
-};
-
-struct newah {
-	u_int8_t	ah_nxt;		/* Next Header */
-	u_int8_t	ah_len;		/* Length of data + 1, in 32bit */
-	u_int16_t	ah_reserve;	/* Reserved for future use */
-	u_int32_t	ah_spi;		/* Security parameter index */
-	u_int32_t	ah_seq;		/* Sequence number field */
-	/* variable size, 32bit bound*/	/* Authentication data */
-};
-
-#include "interface.h"
-#include "addrtoname.h"
+#include "ah.h"
 
 int
-ah_print(register const u_char *bp, register const u_char *bp2)
+ah_print(netdissect_options *ndo, const u_char *bp)
 {
-	register const struct ah *ah;
-	register const u_char *ep;
-	int sumlen;
-	u_int32_t spi;
+	const struct ah *ah;
+	uint8_t ah_len;
+	u_int ah_hdr_len;
+	uint16_t reserved;
+	const u_char *p;
 
-	ah = (struct ah *)bp;
-	ep = snapend;		/* 'ep' points to the end of avaible data. */
+	ndo->ndo_protocol = "ah";
+	ah = (const struct ah *)bp;
 
-	if ((u_char *)(ah + 1) >= ep - sizeof(struct ah))
-		goto trunc;
+	nd_print_protocol_caps(ndo);
+/*
+ * RFC4302
+ *
+ * 2.2.  Payload Length
+ *
+ *    This 8-bit field specifies the length of AH in 32-bit words (4-byte
+ *    units), minus "2".
+ */
+	ah_len = GET_U_1(ah->ah_len);
+	ah_hdr_len = (ah_len + 2) * 4;
 
-	sumlen = ah->ah_len << 2;
-	spi = (u_int32_t)ntohl(ah->ah_spi);
+	ND_PRINT("(");
+	if (ndo->ndo_vflag)
+		ND_PRINT("length=%u(%u-bytes),", ah_len, ah_hdr_len);
+	reserved = GET_BE_U_2(ah->ah_reserved);
+	if (reserved)
+		ND_PRINT("reserved=0x%x[MustBeZero],", reserved);
+	ND_PRINT("spi=0x%08x,", GET_BE_U_4(ah->ah_spi));
+	ND_PRINT("seq=0x%x,", GET_BE_U_4(ah->ah_seq));
+	ND_PRINT("icv=0x");
+	for (p = (const u_char *)(ah + 1); p < bp + ah_hdr_len; p++)
+		ND_PRINT("%02x", GET_U_1(p));
+	ND_PRINT("): ");
 
-	printf("AH(spi=%u", spi);
-	if (vflag)
-		printf(",sumlen=%d", sumlen);
-	printf(",seq=0x%x", (u_int32_t)ntohl(*(u_int32_t *)(ah + 1)));
-	if (bp + sizeof(struct ah) + sumlen > ep)
-		fputs("[truncated]", stdout);
-	fputs("): ", stdout);
-	
-	return sizeof(struct ah) + sumlen;
- trunc:
-	fputs("[|AH]", stdout);
-	return 65535;
+	return ah_hdr_len;
 }