GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/tcpdump/print-icmp.c Lines: 0 128 0.0 %
Date: 2017-11-13 Branches: 0 122 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: print-icmp.c,v 1.25 2015/01/16 06:40:21 deraadt 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/time.h>
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#include <sys/socket.h>
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struct mbuf;
28
struct rtentry;
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.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 <stdio.h>
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#include <string.h>
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#include <limits.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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#define ICMP_INFOTYPE(type) \
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    ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
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    (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
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    (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
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    (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
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    (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
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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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153
/* 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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160
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(const u_char *bp, u_int length, const u_char *bp2)
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{
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	const struct icmp *dp;
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	const struct ip *ip;
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	const char *str, *fmt;
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	const struct ip *oip;
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	const struct udphdr *ouh;
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	u_int hlen, dport, mtu;
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	char buf[HOST_NAME_MAX+1+256];
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	char buf2[HOST_NAME_MAX+1+256];
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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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        (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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	TCHECK(dp->icmp_code);
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	if (qflag)
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		(void) snprintf(buf, sizeof buf, "%u %u", dp->icmp_type,
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		    dp->icmp_code);
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	else switch (dp->icmp_type) {
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	case ICMP_ECHOREPLY:
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	case ICMP_ECHO:
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		if (vflag) {
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			TCHECK(dp->icmp_seq);
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			(void)snprintf(buf, sizeof buf,
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				       "echo %s (id:%04x seq:%u)",
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				       (dp->icmp_type == ICMP_ECHO)?
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				       "request": "reply",
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				       ntohs(dp->icmp_id),
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				       ntohs(dp->icmp_seq));
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		} else
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			str = tok2str(icmp2str, "type-#%u", dp->icmp_type);
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		break;
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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 %u 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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			TCHECK(ouh->uh_dport);
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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 %u port %u 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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			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 %u)",
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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, "#%u %%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-#%u %%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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		const struct ih_rdiscovery *ihp;
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		const struct id_rdiscovery *idp;
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		u_int lifetime, num, size;
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		(void)strlcpy(buf, "router advertisement", sizeof(buf));
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		ihp = (struct ih_rdiscovery *)&dp->icmp_void;
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		TCHECK(*ihp);
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		(void)strlcat(buf, " lifetime ", sizeof(buf));
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		lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
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		if (lifetime < 60)
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			(void)snprintf(buf2, sizeof(buf2), "%u", lifetime);
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		else if (lifetime < 60 * 60)
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			(void)snprintf(buf2, sizeof(buf2), "%u:%02u",
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			    lifetime / 60, lifetime % 60);
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		else
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			(void)snprintf(buf2, sizeof(buf2), "%u:%02u:%02u",
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			    lifetime / 3600, (lifetime % 3600) / 60,
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			    lifetime % 60);
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		strlcat(buf, buf2, sizeof(buf));
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		num = ihp->ird_addrnum;
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		(void)snprintf(buf2, sizeof(buf2), " %u:", num);
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		strlcat(buf, buf2, sizeof(buf));
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		size = ihp->ird_addrsiz;
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		if (size != 2) {
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			(void)snprintf(buf2, sizeof(buf2), " [size %u]", size);
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			strlcat(buf, buf2, sizeof(buf));
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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) {
319
			TCHECK(*idp);
320
			(void)snprintf(buf2, sizeof(buf2), " {%s %u}",
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			    ipaddr_string(&idp->ird_addr),
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			    EXTRACT_32BITS(&idp->ird_pref));
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			strlcat(buf, buf2, sizeof(buf));
324
		}
325
		}
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		break;
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	case ICMP_TIMXCEED:
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		TCHECK(dp->icmp_ip.ip_dst);
330
		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-#%u", dp->icmp_code);
343
			break;
344
		}
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		break;
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	case ICMP_PARAMPROB:
348
		switch (dp->icmp_code) {
349
		case ICMP_PARAMPROB_OPTABSENT:
350
			str = "requested option absent";
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			break;
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		case ICMP_PARAMPROB_LENGTH:
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			snprintf(buf, sizeof buf, "bad length %u", dp->icmp_pptr);
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			break;
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		default:
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			TCHECK(dp->icmp_pptr);
357
			(void)snprintf(buf, sizeof buf,
358
				"parameter problem - octet %u",
359
				dp->icmp_pptr);
360
			break;
361
		}
362
		break;
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	case ICMP_MASKREPLY:
365
		TCHECK(dp->icmp_mask);
366
		(void)snprintf(buf, sizeof buf, "address mask is 0x%08x",
367
		    (u_int32_t)ntohl(dp->icmp_mask));
368
		break;
369
370
	default:
371
		str = tok2str(icmp2str, "type-#%u", dp->icmp_type);
372
		break;
373
	}
374
	(void)printf("icmp: %s", str);
375
	if (vflag) {
376
		if (TTEST2(dp->icmp_type, length)) {
377
			u_int16_t sum, icmp_sum;
378
			sum = in_cksum((const u_short *)dp, length, 0);
379
			if (sum != 0) {
380
				icmp_sum = EXTRACT_16BITS(&dp->icmp_cksum);
381
				(void)printf(" [bad icmp cksum %x! -> %x]", icmp_sum,
382
				    in_cksum_shouldbe(icmp_sum, sum));
383
			}
384
			else
385
				(void)printf(" [icmp cksum ok]");
386
		}
387
	}
388
	if (vflag > 1 && !ICMP_INFOTYPE(dp->icmp_type) &&
389
	    TTEST(dp->icmp_ip)) {
390
		(void)printf(" for ");
391
		oip = &dp->icmp_ip;
392
		ip_print((u_char *)oip, ntohs(oip->ip_len));
393
	}
394
	return;
395
trunc:
396
	fputs("[|icmp]", stdout);
397
}