376 lines
10 KiB
C
376 lines
10 KiB
C
/* $NetBSD: print-icmp.c,v 1.7 2000/10/31 12:17:07 he Exp $ */
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/*
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* Copyright (c) 1988, 1989, 1990, 1991, 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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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static const char rcsid[] =
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"@(#) Header: print-icmp.c,v 1.38 96/09/26 23:36:44 leres Exp (LBL)";
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#else
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__RCSID("$NetBSD: print-icmp.c,v 1.7 2000/10/31 12:17:07 he Exp $");
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#endif
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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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#if __STDC__
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struct mbuf;
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struct rtentry;
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#endif
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#include <net/if.h>
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#include <netinet/in.h>
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#ifdef __NetBSD__
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#include <net/if_ether.h>
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#else
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#include <netinet/if_ether.h>
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#endif
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.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 <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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/* rfc1700 */
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#ifndef ICMP_UNREACH_NET_UNKNOWN
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#define ICMP_UNREACH_NET_UNKNOWN 6 /* destination net unknown */
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#endif
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#ifndef ICMP_UNREACH_HOST_UNKNOWN
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#define ICMP_UNREACH_HOST_UNKNOWN 7 /* destination host unknown */
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#endif
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#ifndef ICMP_UNREACH_ISOLATED
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#define ICMP_UNREACH_ISOLATED 8 /* source host isolated */
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#endif
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#ifndef ICMP_UNREACH_NET_PROHIB
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#define ICMP_UNREACH_NET_PROHIB 9 /* admin prohibited net */
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#endif
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#ifndef ICMP_UNREACH_HOST_PROHIB
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#define ICMP_UNREACH_HOST_PROHIB 10 /* admin prohibited host */
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#endif
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#ifndef ICMP_UNREACH_TOSNET
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#define ICMP_UNREACH_TOSNET 11 /* tos prohibited net */
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#endif
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#ifndef ICMP_UNREACH_TOSHOST
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#define ICMP_UNREACH_TOSHOST 12 /* tos prohibited host */
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#endif
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/* rfc1716 */
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#ifndef ICMP_UNREACH_FILTER_PROHIB
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#define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohibited filter */
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#endif
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#ifndef ICMP_UNREACH_HOST_PRECEDENCE
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#define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host precedence violation */
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#endif
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#ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
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#define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* precedence cutoff */
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#endif
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/* rfc1256 */
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#ifndef ICMP_ROUTERADVERT
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#define ICMP_ROUTERADVERT 9 /* router advertisement */
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#endif
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#ifndef ICMP_ROUTERSOLICIT
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#define ICMP_ROUTERSOLICIT 10 /* router solicitation */
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#endif
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/* Most of the icmp types */
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static struct tok icmp2str[] = {
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{ ICMP_ECHOREPLY, "echo reply" },
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{ ICMP_SOURCEQUENCH, "source quench" },
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{ ICMP_ECHO, "echo request" },
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{ ICMP_ROUTERSOLICIT, "router solicitation" },
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{ ICMP_TSTAMP, "time stamp request" },
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{ ICMP_TSTAMPREPLY, "time stamp reply" },
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{ ICMP_IREQ, "information request" },
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{ ICMP_IREQREPLY, "information reply" },
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{ ICMP_MASKREQ, "address mask request" },
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{ 0, NULL }
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};
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/* Formats for most of the ICMP_UNREACH codes */
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static struct tok unreach2str[] = {
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{ ICMP_UNREACH_NET, "net %s unreachable" },
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{ ICMP_UNREACH_HOST, "host %s unreachable" },
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{ ICMP_UNREACH_SRCFAIL,
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"%s unreachable - source route failed" },
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{ ICMP_UNREACH_NET_UNKNOWN, "net %s unreachable - unknown" },
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{ ICMP_UNREACH_HOST_UNKNOWN, "host %s unreachable - unknown" },
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{ ICMP_UNREACH_ISOLATED,
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"%s unreachable - source host isolated" },
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{ ICMP_UNREACH_NET_PROHIB,
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"net %s unreachable - admin prohibited" },
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{ ICMP_UNREACH_HOST_PROHIB,
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"host %s unreachable - admin prohibited" },
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{ ICMP_UNREACH_TOSNET,
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"net %s unreachable - tos prohibited" },
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{ ICMP_UNREACH_TOSHOST,
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"host %s unreachable - tos prohibited" },
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{ ICMP_UNREACH_FILTER_PROHIB,
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"host %s unreachable - admin prohibited filter" },
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{ ICMP_UNREACH_HOST_PRECEDENCE,
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"host %s unreachable - host precedence violation" },
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{ ICMP_UNREACH_PRECEDENCE_CUTOFF,
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"host %s unreachable - precedence cutoff" },
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{ 0, NULL }
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};
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/* Formats for the ICMP_REDIRECT codes */
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static struct tok type2str[] = {
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{ ICMP_REDIRECT_NET, "redirect %s to net %s" },
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{ ICMP_REDIRECT_HOST, "redirect %s to host %s" },
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{ ICMP_REDIRECT_TOSNET, "redirect-tos %s to net %s" },
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{ ICMP_REDIRECT_TOSHOST, "redirect-tos %s to net %s" },
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{ 0, NULL }
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};
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/* rfc1191 */
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struct mtu_discovery {
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short unused;
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short nexthopmtu;
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};
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/* rfc1256 */
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struct ih_rdiscovery {
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u_char ird_addrnum;
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u_char ird_addrsiz;
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u_short ird_lifetime;
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};
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struct id_rdiscovery {
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u_int32_t ird_addr;
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u_int32_t ird_pref;
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};
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void
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icmp_print(register const u_char *bp, register const u_char *bp2)
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{
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register char *cp;
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register const struct icmp *dp;
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register const struct ip *ip;
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register const char *str, *fmt;
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register const struct ip *oip;
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register const struct udphdr *ouh;
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register u_int hlen, dport, mtu;
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char buf[MAXHOSTNAMELEN + 100];
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dp = (struct icmp *)bp;
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ip = (struct ip *)bp2;
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str = buf;
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#if 0
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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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#endif
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TCHECK(dp->icmp_code);
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switch (dp->icmp_type) {
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case ICMP_UNREACH:
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TCHECK(dp->icmp_ip.ip_dst);
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switch (dp->icmp_code) {
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case ICMP_UNREACH_PROTOCOL:
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TCHECK(dp->icmp_ip.ip_p);
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(void)snprintf(buf, sizeof(buf),
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"%s protocol %d unreachable",
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ipaddr_string(&dp->icmp_ip.ip_dst),
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dp->icmp_ip.ip_p);
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break;
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case ICMP_UNREACH_PORT:
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TCHECK(dp->icmp_ip.ip_p);
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oip = &dp->icmp_ip;
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hlen = oip->ip_hl * 4;
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ouh = (struct udphdr *)(((u_char *)oip) + hlen);
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dport = ntohs(ouh->uh_dport);
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switch (oip->ip_p) {
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case IPPROTO_TCP:
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(void)snprintf(buf, sizeof(buf),
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"%s tcp port %s unreachable",
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ipaddr_string(&oip->ip_dst),
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tcpport_string(dport));
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break;
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case IPPROTO_UDP:
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(void)snprintf(buf, sizeof(buf),
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"%s udp port %s unreachable",
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ipaddr_string(&oip->ip_dst),
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udpport_string(dport));
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break;
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default:
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(void)snprintf(buf, sizeof(buf),
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"%s protocol %d port %d unreachable",
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ipaddr_string(&oip->ip_dst),
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oip->ip_p, dport);
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break;
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}
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break;
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case ICMP_UNREACH_NEEDFRAG:
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{
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register const struct mtu_discovery *mp;
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mp = (struct mtu_discovery *)&dp->icmp_void;
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mtu = EXTRACT_16BITS(&mp->nexthopmtu);
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if (mtu)
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(void)snprintf(buf, sizeof(buf),
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"%s unreachable - need to frag (mtu %d)",
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ipaddr_string(&dp->icmp_ip.ip_dst), mtu);
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else
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(void)snprintf(buf, sizeof(buf),
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"%s unreachable - need to frag",
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ipaddr_string(&dp->icmp_ip.ip_dst));
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}
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break;
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default:
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fmt = tok2str(unreach2str, "#%d %%s unreachable",
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dp->icmp_code);
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(void)snprintf(buf, sizeof(buf), fmt,
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ipaddr_string(&dp->icmp_ip.ip_dst));
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break;
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}
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break;
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case ICMP_REDIRECT:
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TCHECK(dp->icmp_ip.ip_dst);
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fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
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dp->icmp_code);
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(void)snprintf(buf, sizeof(buf), fmt,
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ipaddr_string(&dp->icmp_ip.ip_dst),
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ipaddr_string(&dp->icmp_gwaddr));
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break;
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case ICMP_ROUTERADVERT:
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{
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register const struct ih_rdiscovery *ihp;
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register const struct id_rdiscovery *idp;
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u_int lifetime, num, size;
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(void)strcpy(buf, "router advertisement");
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cp = buf + strlen(buf);
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ihp = (struct ih_rdiscovery *)&dp->icmp_void;
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TCHECK(*ihp);
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(void)strcpy(cp, " lifetime ");
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cp = buf + strlen(buf);
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lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
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if (lifetime < 60)
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(void)snprintf(cp, sizeof(buf) - strlen(buf),
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"%u", lifetime);
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else if (lifetime < 60 * 60)
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(void)snprintf(cp, sizeof(buf) - strlen(buf),
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"%u:%02u", lifetime / 60, lifetime % 60);
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else
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(void)snprintf(cp, sizeof(buf) - strlen(buf),
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"%u:%02u:%02u",
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lifetime / 3600,
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(lifetime % 3600) / 60,
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lifetime % 60);
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cp = buf + strlen(buf);
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num = ihp->ird_addrnum;
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(void)snprintf(cp, sizeof(buf) - strlen(buf), " %d:", num);
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cp = buf + strlen(buf);
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size = ihp->ird_addrsiz;
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if (size != 2) {
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(void)snprintf(cp, sizeof(buf) - strlen(buf),
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" [size %d]", size);
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break;
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}
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idp = (struct id_rdiscovery *)&dp->icmp_data;
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while (num-- > 0) {
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TCHECK(*idp);
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(void)snprintf(cp, sizeof(buf) - strlen(buf),
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" {%s %u}",
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ipaddr_string(&idp->ird_addr),
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EXTRACT_32BITS(&idp->ird_pref));
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cp = buf + strlen(buf);
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}
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}
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break;
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case ICMP_TIMXCEED:
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TCHECK(dp->icmp_ip.ip_dst);
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switch (dp->icmp_code) {
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case ICMP_TIMXCEED_INTRANS:
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str = "time exceeded in-transit";
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break;
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case ICMP_TIMXCEED_REASS:
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str = "ip reassembly time exceeded";
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break;
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default:
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(void)snprintf(buf, sizeof(buf),
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"time exceeded-#%d", dp->icmp_code);
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break;
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}
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break;
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case ICMP_PARAMPROB:
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if (dp->icmp_code)
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(void)snprintf(buf, sizeof(buf),
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"parameter problem - code %d",
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dp->icmp_code);
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else {
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TCHECK(dp->icmp_pptr);
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(void)snprintf(buf, sizeof(buf),
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"parameter problem - octet %d",
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dp->icmp_pptr);
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}
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break;
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case ICMP_MASKREPLY:
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TCHECK(dp->icmp_mask);
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(void)snprintf(buf, sizeof(buf), "address mask is 0x%08x",
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(u_int32_t)ntohl(dp->icmp_mask));
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break;
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default:
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str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
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break;
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}
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(void)printf("icmp: %s", str);
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return;
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trunc:
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fputs("[|icmp]", stdout);
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}
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