f2e3e9a91e
reports to be printed as IGMPv1, and a misapplied patch caused IGMP Leave messages to be partially interpreted as DVMRP routing messages.
523 lines
12 KiB
C
523 lines
12 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
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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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#ifndef lint
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static char rcsid[] =
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"@(#) $Header: print-ip.c,v 1.56 96/07/23 14:17:24 leres Exp $ (LBL)";
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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 <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 <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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/* 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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#ifndef IN_CLASSD
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#define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
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#endif
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/* (following from ipmulti/mrouted/prune.h) */
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/*
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* The packet format for a traceroute request.
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*/
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struct tr_query {
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u_int tr_src; /* traceroute source */
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u_int tr_dst; /* traceroute destination */
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u_int tr_raddr; /* traceroute response address */
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#if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
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struct {
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u_int qid : 24; /* traceroute query id */
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u_int ttl : 8; /* traceroute response ttl */
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} q;
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#else
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struct {
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u_int ttl : 8; /* traceroute response ttl */
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u_int qid : 24; /* traceroute query id */
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} q;
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#endif /* BYTE_ORDER */
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};
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#define tr_rttl q.ttl
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#define tr_qid q.qid
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/*
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* Traceroute response format. A traceroute response has a tr_query at the
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* beginning, followed by one tr_resp for each hop taken.
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*/
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struct tr_resp {
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u_int tr_qarr; /* query arrival time */
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u_int tr_inaddr; /* incoming interface address */
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u_int tr_outaddr; /* outgoing interface address */
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u_int tr_rmtaddr; /* parent address in source tree */
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u_int tr_vifin; /* input packet count on interface */
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u_int tr_vifout; /* output packet count on interface */
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u_int tr_pktcnt; /* total incoming packets for src-grp */
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u_char tr_rproto; /* routing proto deployed on router */
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u_char tr_fttl; /* ttl required to forward on outvif */
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u_char tr_smask; /* subnet mask for src addr */
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u_char tr_rflags; /* forwarding error codes */
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};
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/* defs within mtrace */
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#define TR_QUERY 1
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#define TR_RESP 2
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/* fields for tr_rflags (forwarding error codes) */
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#define TR_NO_ERR 0
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#define TR_WRONG_IF 1
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#define TR_PRUNED 2
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#define TR_OPRUNED 3
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#define TR_SCOPED 4
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#define TR_NO_RTE 5
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#define TR_NO_FWD 7
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#define TR_NO_SPACE 0x81
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#define TR_OLD_ROUTER 0x82
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/* fields for tr_rproto (routing protocol) */
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#define TR_PROTO_DVMRP 1
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#define TR_PROTO_MOSPF 2
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#define TR_PROTO_PIM 3
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#define TR_PROTO_CBT 4
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static void print_mtrace(register const u_char *bp, register u_int len)
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{
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register struct tr_query* tr = (struct tr_query*)(bp + 8);
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printf("mtrace %d: %s to %s reply-to %s", tr->tr_qid,
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ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
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ipaddr_string(&tr->tr_raddr));
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if (IN_CLASSD(ntohl(tr->tr_raddr)))
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printf(" with-ttl %d", tr->tr_rttl);
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}
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static void print_mresp(register const u_char *bp, register u_int len)
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{
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register struct tr_query* tr = (struct tr_query*)(bp + 8);
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printf("mresp %d: %s to %s reply-to %s", tr->tr_qid,
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ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
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ipaddr_string(&tr->tr_raddr));
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if (IN_CLASSD(ntohl(tr->tr_raddr)))
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printf(" with-ttl %d", tr->tr_rttl);
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}
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static void
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igmp_print(register const u_char *bp, register u_int len,
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register const u_char *bp2)
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{
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register const struct ip *ip;
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ip = (const struct ip *)bp2;
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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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TCHECK2(bp[0], 8);
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switch (bp[0]) {
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case 0x11:
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(void)printf("igmp %s query", bp[1] ? "v2" : "v1");
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if (bp[1] && bp[1] != 100)
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(void)printf(" [intvl %d]", bp[1]);
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if (*(int *)&bp[4])
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(void)printf(" [gaddr %s]", ipaddr_string(&bp[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 0x12:
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case 0x16:
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(void)printf("igmp %s report %s",
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(bp[0] & 0x0f) == 6 ? "v2" : "v1",
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ipaddr_string(&bp[4]));
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if (len != 8)
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(void)printf(" [len %d]", len);
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if (bp[1])
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(void)printf(" [b1=0x%x]", bp[1]);
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break;
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case 0x17:
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(void)printf("igmp leave %s", ipaddr_string(&bp[4]));
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if (len != 8)
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(void)printf(" [len %d]", len);
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if (bp[1])
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(void)printf(" [b1=0x%x]", bp[1]);
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break;
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case 0x13:
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(void)printf("igmp dvmrp");
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if (len < 8)
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(void)printf(" [len %d]", len);
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else
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dvmrp_print(bp, len);
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break;
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case 0x14:
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(void)printf("igmp pim");
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pim_print(bp, len);
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break;
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case 0x1e:
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print_mresp(bp, len);
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break;
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case 0x1f:
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print_mtrace(bp, len);
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break;
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default:
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(void)printf("igmp-%d", bp[0] & 0xf);
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if (bp[1])
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(void)printf(" [b1=0x%02x]", bp[1]);
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break;
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}
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TCHECK2(bp[0], len);
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if (vflag) {
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/* Check the IGMP checksum */
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u_int32_t sum = 0;
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int count;
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const u_short *sp = (u_short*)bp;
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for (count = len / 2; --count >= 0; )
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sum += *sp++;
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if (len & 1)
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sum += ntohs(*(unsigned char*) sp << 8);
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while (sum >> 16)
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sum = (sum & 0xffff) + (sum >> 16);
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sum = 0xffff & ~sum;
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if (sum != 0)
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printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2]));
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}
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return;
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trunc:
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fputs("[|igmp]", stdout);
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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(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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/*
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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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len = (tt == IPOPT_NOP || tt == IPOPT_EOL) ? 1 : cp[1];
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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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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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case IPOPT_RA:
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printf(" RA{%d}", len);
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if (cp[2] != 0 || cp[3] != 0)
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printf(" [b23=0x04%x]", cp[2] << 8 | 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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static int
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in_cksum(const struct ip *ip)
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{
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register const u_short *sp = (u_short *)ip;
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register u_int32_t sum = 0;
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register int count;
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/*
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* No need for endian conversions.
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*/
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for (count = ip->ip_hl * 2; --count >= 0; )
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sum += *sp++;
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while (sum > 0xffff)
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sum = (sum & 0xffff) + (sum >> 16);
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sum = ~sum & 0xffff;
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return (sum);
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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, off;
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register const u_char *cp;
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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->ip_hl * 4;
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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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/*
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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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switch (ip->ip_p) {
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case IPPROTO_TCP:
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tcp_print(cp, len, (const u_char *)ip);
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break;
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case IPPROTO_UDP:
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udp_print(cp, len, (const u_char *)ip);
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break;
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case IPPROTO_ICMP:
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icmp_print(cp, (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("%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(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, (const u_char *)ip);
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break;
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#ifndef IPPROTO_ENCAP
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#define IPPROTO_ENCAP 4
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#endif
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case IPPROTO_ENCAP:
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/* ip-in-ip encapsulation */
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if (vflag)
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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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ip_print(cp, len);
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if (! vflag) {
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printf(" (encap)");
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return;
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}
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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 (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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(void)printf(" (frag %d:%d@%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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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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if ((u_char *)ip + hlen <= snapend) {
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sum = in_cksum(ip);
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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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}
|
|
}
|