316 lines
7.2 KiB
C
316 lines
7.2 KiB
C
/*
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* Copyright (c) 1988-1990 The Regents of the University of California.
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* 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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* $Id: print-ip.c,v 1.1 1993/11/14 21:20:43 deraadt Exp $
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*/
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#ifndef lint
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static char rcsid[] =
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"@(#) Header: print-ip.c,v 1.28 92/05/25 14:29:02 mccanne Exp (LBL)";
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#endif
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcpip.h>
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#include "interface.h"
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#include "addrtoname.h"
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void
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igmp_print(cp, len, ip)
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register u_char *cp;
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register int len;
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register struct ip *ip;
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{
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register u_char *ep = (u_char *)snapend;
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(void)printf("%s > %s: ",
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ipaddr_string(&ip->ip_src),
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ipaddr_string(&ip->ip_dst));
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if (cp + 7 > ep) {
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(void)printf("[|igmp]");
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return;
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}
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switch (cp[0] & 0xf) {
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case 1:
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(void)printf("igmp query");
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if (*(int *)&cp[4])
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(void)printf(" [gaddr %s]", ipaddr_string(&cp[4]));
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if (len != 8)
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(void)printf(" [len %d]", len);
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break;
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case 2:
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(void)printf("igmp report %s", ipaddr_string(&cp[4]));
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if (len != 8)
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(void)printf(" [len %d]", len);
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break;
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case 3:
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(void)printf("igmp dvmrp", ipaddr_string(&cp[4]));
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if (len < 8)
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(void)printf(" [len %d]", len);
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break;
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default:
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(void)printf("igmp-%d", cp[0] & 0xf);
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break;
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}
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if ((cp[0] >> 4) != 1)
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(void)printf(" [v%d]", cp[0] >> 4);
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if (cp[1])
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(void)printf(" [b1=0x%x]", cp[1]);
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}
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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(type, cp, length)
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char *type;
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register u_char *cp;
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int length;
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{
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int ptr = cp[2] - 1;
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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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#ifdef TCPDUMP_ALIGN
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{
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struct in_addr addr;
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bcopy((char *)&cp[len], (char *)&addr, sizeof(addr));
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printf("%s%s", type, ipaddr_string(&addr));
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}
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#else
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printf("%s%s", type, ipaddr_string(&cp[len]));
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#endif
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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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/*
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* print IP options.
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*/
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static void
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ip_optprint(cp, length)
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register u_char *cp;
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int length;
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{
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int len;
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for (; length > 0; cp += len, length -= len) {
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int tt = *cp;
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len = (tt == IPOPT_NOP || tt == IPOPT_EOL) ? 1 : cp[1];
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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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printf(" TS{%d}", len);
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break;
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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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printf(" RR{%d}=", len);
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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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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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* print an IP datagram.
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*/
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void
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ip_print(ip, length)
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register struct ip *ip;
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register int length;
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{
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register int hlen;
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register int len;
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register unsigned char *cp;
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#ifdef TCPDUMP_ALIGN
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static u_char *abuf;
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/*
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* The IP header is not word aligned, so 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 ((int)ip & (sizeof(long)-1)) {
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if (abuf == 0)
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abuf = (u_char *)malloc(snaplen);
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bcopy((char *)ip, (char *)abuf, 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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}
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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->ip_hl * 4;
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NTOHS(ip->ip_len);
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NTOHS(ip->ip_off);
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NTOHS(ip->ip_id);
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len = ip->ip_len - hlen;
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if (length < ip->ip_len)
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(void)printf("truncated-ip - %d bytes missing!",
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ip->ip_len - length);
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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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if ((ip->ip_off & 0x1fff) == 0) {
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cp = (unsigned char *)ip + hlen;
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switch (ip->ip_p) {
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case IPPROTO_TCP:
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tcp_print((struct tcphdr *)cp, len, ip);
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break;
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case IPPROTO_UDP:
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udp_print((struct udphdr *)cp, len, ip);
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break;
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case IPPROTO_ICMP:
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icmp_print((struct icmp *)cp, ip);
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break;
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case IPPROTO_ND:
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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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(void)printf(" nd %d", len);
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break;
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case IPPROTO_EGP:
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egp_print((struct egp_packet *)cp, len, 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((struct ospfhdr *)cp, len, 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, ip);
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break;
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default:
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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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(void)printf(" ip-proto-%d %d", ip->ip_p, len);
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break;
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}
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}
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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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if (ip->ip_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 (ip->ip_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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(void)printf(" (frag %d:%d@%d%s)", ip->ip_id, len,
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(ip->ip_off & 0x1fff) * 8,
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(ip->ip_off & IP_MF)? "+" : "");
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} else if (ip->ip_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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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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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 ((ip->ip_off & 0x3fff) == 0) {
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(void)printf("%sid %d", sep, (int)ip->ip_id);
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sep = ", ";
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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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