1 /* $NetBSD: print-ah.c,v 1.4 1996/05/20 00:41:16 fvdl Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions 9 * retain the above copyright notice and this paragraph in its entirety, (2) 10 * distributions including binary code include the above copyright notice and 11 * this paragraph in its entirety in the documentation or other materials 12 * provided with the distribution, and (3) all advertising materials mentioning 13 * features or use of this software display the following acknowledgement: 14 * ``This product includes software developed by the University of California, 15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 16 * the University nor the names of its contributors may be used to endorse 17 * or promote products derived from this software without specific prior 18 * written permission. 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 22 */ 23 24 #ifndef lint 25 static const char rcsid[] = 26 "@(#) $Header: /tcpdump/master/tcpdump/print-ah.c,v 1.5 1999/12/15 08:10:17 fenner Exp $ (LBL)"; 27 #endif 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <sys/param.h> 34 #include <sys/time.h> 35 #include <sys/types.h> 36 #include <sys/socket.h> 37 38 #include <net/route.h> 39 #include <net/if.h> 40 41 #include <netinet/in.h> 42 #include <netinet/if_ether.h> 43 #include <netinet/in_systm.h> 44 #include <netinet/ip.h> 45 #include <netinet/ip_icmp.h> 46 #include <netinet/ip_var.h> 47 #include <netinet/udp.h> 48 #include <netinet/udp_var.h> 49 #include <netinet/tcp.h> 50 51 #include <stdio.h> 52 53 /* there's no standard definition so we are on our own */ 54 struct ah { 55 u_int8_t ah_nxt; /* Next Header */ 56 u_int8_t ah_len; /* Length of data, in 32bit */ 57 u_int16_t ah_reserve; /* Reserved for future use */ 58 u_int32_t ah_spi; /* Security parameter index */ 59 /* variable size, 32bit bound*/ /* Authentication data */ 60 }; 61 62 struct newah { 63 u_int8_t ah_nxt; /* Next Header */ 64 u_int8_t ah_len; /* Length of data + 1, in 32bit */ 65 u_int16_t ah_reserve; /* Reserved for future use */ 66 u_int32_t ah_spi; /* Security parameter index */ 67 u_int32_t ah_seq; /* Sequence number field */ 68 /* variable size, 32bit bound*/ /* Authentication data */ 69 }; 70 71 #include "interface.h" 72 #include "addrtoname.h" 73 74 int 75 ah_print(register const u_char *bp, register const u_char *bp2) 76 { 77 register const struct ah *ah; 78 register const u_char *ep; 79 int sumlen; 80 u_int32_t spi; 81 82 ah = (struct ah *)bp; 83 ep = snapend; /* 'ep' points to the end of avaible data. */ 84 85 if ((u_char *)(ah + 1) >= ep - sizeof(struct ah)) 86 goto trunc; 87 88 sumlen = ah->ah_len << 2; 89 spi = (u_int32_t)ntohl(ah->ah_spi); 90 91 printf("AH(spi=%u", spi); 92 if (vflag) 93 printf(",sumlen=%d", sumlen); 94 printf(",seq=0x%x", (u_int32_t)ntohl(*(u_int32_t *)(ah + 1))); 95 if (bp + sizeof(struct ah) + sumlen > ep) 96 fputs("[truncated]", stdout); 97 fputs("): ", stdout); 98 99 return sizeof(struct ah) + sumlen; 100 trunc: 101 fputs("[|AH]", stdout); 102 return 65535; 103 } 104