580 lines
12 KiB
C
580 lines
12 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $FreeBSD$
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.100 2001/09/17 21:58:03 fenner Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "addrtoname.h"
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#include "interface.h"
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#include "extract.h" /* must come after interface.h */
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#include "ip.h"
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/* Compatibility */
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#ifndef IPPROTO_ND
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#define IPPROTO_ND 77
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#endif
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/*
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* print the recorded route in an IP RR, LSRR or SSRR option.
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*/
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static void
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ip_printroute(const char *type, register const u_char *cp, u_int length)
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{
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register u_int ptr = cp[2] - 1;
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register u_int len;
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printf(" %s{", type);
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if ((length + 1) & 3)
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printf(" [bad length %d]", length);
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if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
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printf(" [bad ptr %d]", cp[2]);
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type = "";
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for (len = 3; len < length; len += 4) {
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if (ptr == len)
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type = "#";
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printf("%s%s", type, ipaddr_string(&cp[len]));
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type = " ";
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}
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printf("%s}", ptr == len? "#" : "");
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}
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static void
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ip_printts(register const u_char *cp, u_int length)
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{
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register u_int ptr = cp[2] - 1;
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register u_int len = 0;
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int hoplen;
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char *type;
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printf(" TS{");
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hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
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if ((length - 4) & (hoplen-1))
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printf("[bad length %d]", length);
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if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
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printf("[bad ptr %d]", cp[2]);
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switch (cp[3]&0xF) {
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case IPOPT_TS_TSONLY:
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printf("TSONLY");
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break;
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case IPOPT_TS_TSANDADDR:
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printf("TS+ADDR");
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break;
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/*
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* prespecified should really be 3, but some ones might send 2
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* instead, and the IPOPT_TS_PRESPEC constant can apparently
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* have both values, so we have to hard-code it here.
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*/
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case 2:
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printf("PRESPEC2.0");
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break;
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case 3: /* IPOPT_TS_PRESPEC */
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printf("PRESPEC");
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break;
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default:
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printf("[bad ts type %d]", cp[3]&0xF);
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goto done;
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}
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type = " ";
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for (len = 4; len < length; len += hoplen) {
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if (ptr == len)
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type = " ^ ";
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printf("%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
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hoplen!=8 ? "" : ipaddr_string(&cp[len]));
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type = " ";
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}
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done:
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printf("%s", ptr == len ? " ^ " : "");
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if (cp[3]>>4)
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printf(" [%d hops not recorded]} ", cp[3]>>4);
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else
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printf("}");
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}
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/*
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* print IP options.
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*/
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static void
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ip_optprint(register const u_char *cp, u_int length)
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{
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register u_int len;
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for (; length > 0; cp += len, length -= len) {
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int tt = *cp;
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if (tt == IPOPT_NOP || tt == IPOPT_EOL)
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len = 1;
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else {
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if (&cp[1] >= snapend) {
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printf("[|ip]");
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return;
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}
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len = cp[1];
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}
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if (len <= 0) {
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printf("[|ip op len %d]", len);
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return;
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}
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if (&cp[1] >= snapend || cp + len > snapend) {
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printf("[|ip]");
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return;
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}
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switch (tt) {
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case IPOPT_EOL:
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printf(" EOL");
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if (length > 1)
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printf("-%d", length - 1);
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return;
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case IPOPT_NOP:
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printf(" NOP");
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break;
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case IPOPT_TS:
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ip_printts(cp, len);
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break;
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#ifndef IPOPT_SECURITY
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#define IPOPT_SECURITY 130
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#endif /* IPOPT_SECURITY */
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case IPOPT_SECURITY:
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printf(" SECURITY{%d}", len);
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break;
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case IPOPT_RR:
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ip_printroute("RR", cp, len);
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break;
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case IPOPT_SSRR:
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ip_printroute("SSRR", cp, len);
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break;
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case IPOPT_LSRR:
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ip_printroute("LSRR", cp, len);
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break;
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#ifndef IPOPT_RA
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#define IPOPT_RA 148 /* router alert */
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#endif
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case IPOPT_RA:
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printf(" RA");
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if (len != 4)
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printf("{%d}", len);
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else if (cp[2] || cp[3])
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printf("%d.%d", cp[2], cp[3]);
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break;
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default:
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printf(" IPOPT-%d{%d}", cp[0], len);
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break;
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}
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}
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}
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/*
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* compute an IP header checksum.
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* don't modifiy the packet.
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*/
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u_short
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in_cksum(const u_short *addr, register u_int len, int csum)
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{
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int nleft = len;
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const u_short *w = addr;
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u_short answer;
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int sum = csum;
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/*
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* Our algorithm is simple, using a 32 bit accumulator (sum),
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* we add sequential 16 bit words to it, and at the end, fold
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* back all the carry bits from the top 16 bits into the lower
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* 16 bits.
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*/
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while (nleft > 1) {
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sum += *w++;
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nleft -= 2;
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}
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if (nleft == 1)
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sum += htons(*(u_char *)w<<8);
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/*
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* add back carry outs from top 16 bits to low 16 bits
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*/
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sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
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sum += (sum >> 16); /* add carry */
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answer = ~sum; /* truncate to 16 bits */
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return (answer);
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}
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/*
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* print an IP datagram.
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*/
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void
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ip_print(register const u_char *bp, register u_int length)
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{
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register const struct ip *ip;
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register u_int hlen, len, len0, off;
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register const u_char *cp;
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u_char nh;
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int advance;
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ip = (const struct ip *)bp;
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#ifdef LBL_ALIGN
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/*
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* If the IP header is not aligned, copy into abuf.
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* This will never happen with BPF. It does happen raw packet
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* dumps from -r.
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*/
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if ((long)ip & 3) {
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static u_char *abuf = NULL;
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static int didwarn = 0;
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if (abuf == NULL) {
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abuf = (u_char *)malloc(snaplen);
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if (abuf == NULL)
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error("ip_print: malloc");
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}
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memcpy((char *)abuf, (char *)ip, min(length, snaplen));
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snapend += abuf - (u_char *)ip;
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packetp = abuf;
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ip = (struct ip *)abuf;
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/* We really want libpcap to give us aligned packets */
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if (!didwarn) {
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warning("compensating for unaligned libpcap packets");
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++didwarn;
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}
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}
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#endif
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if ((u_char *)(ip + 1) > snapend) {
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printf("[|ip]");
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return;
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}
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if (length < sizeof (struct ip)) {
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(void)printf("truncated-ip %d", length);
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return;
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}
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hlen = IP_HL(ip) * 4;
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if (hlen < sizeof (struct ip)) {
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(void)printf("bad-hlen %d", hlen);
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return;
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}
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len = ntohs(ip->ip_len);
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if (length < len)
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(void)printf("truncated-ip - %d bytes missing! ",
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len - length);
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len -= hlen;
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len0 = len;
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/*
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* If this is fragment zero, hand it to the next higher
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* level protocol.
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*/
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off = ntohs(ip->ip_off);
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if ((off & 0x1fff) == 0) {
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cp = (const u_char *)ip + hlen;
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nh = ip->ip_p;
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#ifndef IPPROTO_SCTP
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#define IPPROTO_SCTP 132
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#endif
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if (nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
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nh != IPPROTO_SCTP) {
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(void)printf("%s > %s: ", ipaddr_string(&ip->ip_src),
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ipaddr_string(&ip->ip_dst));
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}
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again:
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switch (nh) {
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#ifndef IPPROTO_AH
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#define IPPROTO_AH 51
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#endif
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case IPPROTO_AH:
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nh = *cp;
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advance = ah_print(cp, (const u_char *)ip);
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cp += advance;
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len -= advance;
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goto again;
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#ifndef IPPROTO_ESP
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#define IPPROTO_ESP 50
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#endif
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case IPPROTO_ESP:
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{
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int enh, padlen;
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advance = esp_print(cp, (const u_char *)ip, &enh, &padlen);
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cp += advance;
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len -= advance + padlen;
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if (enh < 0)
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break;
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nh = enh & 0xff;
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goto again;
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}
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#ifndef IPPROTO_IPCOMP
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#define IPPROTO_IPCOMP 108
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#endif
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case IPPROTO_IPCOMP:
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{
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int enh;
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advance = ipcomp_print(cp, (const u_char *)ip, &enh);
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cp += advance;
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len -= advance;
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if (enh < 0)
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break;
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nh = enh & 0xff;
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goto again;
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}
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case IPPROTO_SCTP:
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sctp_print(cp, (const u_char *)ip, len);
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break;
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case IPPROTO_TCP:
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tcp_print(cp, len, (const u_char *)ip, (off &~ 0x6000));
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break;
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case IPPROTO_UDP:
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udp_print(cp, len, (const u_char *)ip, (off &~ 0x6000));
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break;
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case IPPROTO_ICMP:
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icmp_print(cp, len, (const u_char *)ip);
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break;
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#ifndef IPPROTO_IGRP
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#define IPPROTO_IGRP 9
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#endif
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case IPPROTO_IGRP:
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igrp_print(cp, len, (const u_char *)ip);
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break;
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case IPPROTO_ND:
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(void)printf(" nd %d", len);
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break;
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case IPPROTO_EGP:
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egp_print(cp, len, (const u_char *)ip);
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break;
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#ifndef IPPROTO_OSPF
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#define IPPROTO_OSPF 89
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#endif
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case IPPROTO_OSPF:
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ospf_print(cp, len, (const u_char *)ip);
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break;
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#ifndef IPPROTO_IGMP
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#define IPPROTO_IGMP 2
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#endif
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case IPPROTO_IGMP:
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igmp_print(cp, len);
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break;
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case 4:
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/* DVMRP multicast tunnel (ip-in-ip encapsulation) */
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ip_print(cp, len);
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if (! vflag) {
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printf(" (ipip-proto-4)");
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return;
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}
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break;
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#ifdef INET6
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#ifndef IP6PROTO_ENCAP
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#define IP6PROTO_ENCAP 41
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#endif
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case IP6PROTO_ENCAP:
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/* ip6-in-ip encapsulation */
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ip6_print(cp, len);
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break;
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#endif /*INET6*/
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#ifndef IPPROTO_GRE
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#define IPPROTO_GRE 47
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#endif
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case IPPROTO_GRE:
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/* do it */
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gre_print(cp, len);
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break;
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#ifndef IPPROTO_MOBILE
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#define IPPROTO_MOBILE 55
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#endif
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case IPPROTO_MOBILE:
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mobile_print(cp, len);
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break;
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#ifndef IPPROTO_PIM
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#define IPPROTO_PIM 103
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#endif
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case IPPROTO_PIM:
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pim_print(cp, len);
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break;
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#ifndef IPPROTO_VRRP
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#define IPPROTO_VRRP 112
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#endif
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case IPPROTO_VRRP:
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vrrp_print(cp, len, ip->ip_ttl);
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break;
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default:
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(void)printf(" ip-proto-%d %d", nh, len);
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break;
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}
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}
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/* Ultra quiet now means that all this stuff should be suppressed */
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/* res 3-Nov-98 */
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if (qflag > 1) return;
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/*
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* for fragmented datagrams, print id:size@offset. On all
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* but the last stick a "+". For unfragmented datagrams, note
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* the don't fragment flag.
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*/
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len = len0; /* get the original length */
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if (off & 0x3fff) {
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/*
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* if this isn't the first frag, we're missing the
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* next level protocol header. print the ip addr.
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*/
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if (off & 0x1fff)
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(void)printf("%s > %s:", ipaddr_string(&ip->ip_src),
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ipaddr_string(&ip->ip_dst));
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#ifndef IP_MF
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#define IP_MF 0x2000
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#endif /* IP_MF */
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#ifndef IP_DF
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#define IP_DF 0x4000
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#endif /* IP_DF */
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(void)printf(" (frag %d:%u@%d%s)", ntohs(ip->ip_id), len,
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(off & 0x1fff) * 8,
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(off & IP_MF)? "+" : "");
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} else if (off & IP_DF)
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(void)printf(" (DF)");
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if (ip->ip_tos) {
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(void)printf(" [tos 0x%x", (int)ip->ip_tos);
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/* ECN bits */
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if (ip->ip_tos & 0x03) {
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switch (ip->ip_tos & 0x03) {
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case 1:
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(void)printf(",ECT(1)");
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break;
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case 2:
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(void)printf(",ECT(0)");
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break;
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case 3:
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(void)printf(",CE");
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}
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}
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(void)printf("] ");
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}
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if (ip->ip_ttl <= 1)
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(void)printf(" [ttl %d]", (int)ip->ip_ttl);
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if (vflag) {
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int sum;
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char *sep = "";
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printf(" (");
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if (ip->ip_ttl > 1) {
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(void)printf("%sttl %d", sep, (int)ip->ip_ttl);
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sep = ", ";
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}
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if ((off & 0x3fff) == 0) {
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(void)printf("%sid %d", sep, (int)ntohs(ip->ip_id));
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sep = ", ";
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}
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(void)printf("%slen %d", sep, (int)ntohs(ip->ip_len));
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sep = ", ";
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if ((u_char *)ip + hlen <= snapend) {
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sum = in_cksum((const u_short *)ip, hlen, 0);
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if (sum != 0) {
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(void)printf("%sbad cksum %x!", sep,
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ntohs(ip->ip_sum));
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sep = ", ";
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}
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}
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if ((hlen -= sizeof(struct ip)) > 0) {
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(void)printf("%soptlen=%d", sep, hlen);
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ip_optprint((u_char *)(ip + 1), hlen);
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}
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printf(")");
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}
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}
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void
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ipN_print(register const u_char *bp, register u_int length)
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{
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struct ip *ip, hdr;
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ip = (struct ip *)bp;
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if (length < 4) {
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(void)printf("truncated-ip %d", length);
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return;
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}
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memcpy (&hdr, (char *)ip, 4);
|
|
switch (IP_V(&hdr)) {
|
|
case 4:
|
|
ip_print (bp, length);
|
|
return;
|
|
#ifdef INET6
|
|
case 6:
|
|
ip6_print (bp, length);
|
|
return;
|
|
#endif
|
|
default:
|
|
(void)printf("unknown ip %d", IP_V(&hdr));
|
|
return;
|
|
}
|
|
}
|