10Sstevel@tonic-gate /*
2*1254Smeem  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
30Sstevel@tonic-gate  * Use is subject to license terms.
40Sstevel@tonic-gate  */
50Sstevel@tonic-gate 
60Sstevel@tonic-gate /*
70Sstevel@tonic-gate  * Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997
80Sstevel@tonic-gate  *	The Regents of the University of California.  All rights reserved.
90Sstevel@tonic-gate  *
100Sstevel@tonic-gate  * Redistribution and use in source and binary forms, with or without
110Sstevel@tonic-gate  * modification, are permitted provided that: (1) source code distributions
120Sstevel@tonic-gate  * retain the above copyright notice and this paragraph in its entirety, (2)
130Sstevel@tonic-gate  * distributions including binary code include the above copyright notice and
140Sstevel@tonic-gate  * this paragraph in its entirety in the documentation or other materials
150Sstevel@tonic-gate  * provided with the distribution, and (3) all advertising materials mentioning
160Sstevel@tonic-gate  * features or use of this software display the following acknowledgement:
170Sstevel@tonic-gate  * ``This product includes software developed by the University of California,
180Sstevel@tonic-gate  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
190Sstevel@tonic-gate  * the University nor the names of its contributors may be used to endorse
200Sstevel@tonic-gate  * or promote products derived from this software without specific prior
210Sstevel@tonic-gate  * written permission.
220Sstevel@tonic-gate  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
230Sstevel@tonic-gate  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
240Sstevel@tonic-gate  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
250Sstevel@tonic-gate  *
260Sstevel@tonic-gate  *
270Sstevel@tonic-gate  * @(#)$Header: traceroute.c,v 1.49 97/06/13 02:30:23 leres Exp $ (LBL)
280Sstevel@tonic-gate  */
290Sstevel@tonic-gate 
300Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
310Sstevel@tonic-gate 
320Sstevel@tonic-gate #include <sys/socket.h>
330Sstevel@tonic-gate 
340Sstevel@tonic-gate #include <stdio.h>
350Sstevel@tonic-gate #include <stdlib.h>
360Sstevel@tonic-gate #include <ctype.h>
370Sstevel@tonic-gate #include <strings.h>
380Sstevel@tonic-gate #include <libintl.h>
390Sstevel@tonic-gate #include <errno.h>
400Sstevel@tonic-gate 
410Sstevel@tonic-gate #include <netinet/in_systm.h>
420Sstevel@tonic-gate #include <netinet/in.h>
430Sstevel@tonic-gate #include <netinet/ip.h>
440Sstevel@tonic-gate #include <netinet/ip_var.h>
450Sstevel@tonic-gate #include <netinet/ip_icmp.h>
460Sstevel@tonic-gate #include <netinet/udp.h>
470Sstevel@tonic-gate #include <netinet/udp_var.h>
480Sstevel@tonic-gate 
490Sstevel@tonic-gate #include <arpa/inet.h>
500Sstevel@tonic-gate #include <netdb.h>
510Sstevel@tonic-gate 
52*1254Smeem #include <libinetutil.h>
530Sstevel@tonic-gate #include "traceroute.h"
540Sstevel@tonic-gate 
550Sstevel@tonic-gate /*
560Sstevel@tonic-gate  * IPv4 source routing option.
570Sstevel@tonic-gate  * In order to avoid padding for the alignment of IPv4 addresses, ipsr_addrs
580Sstevel@tonic-gate  * is defined as a 2-D array of uint8_t, instead of 1-D array of struct in_addr.
590Sstevel@tonic-gate  */
600Sstevel@tonic-gate struct ip_sourceroute {
610Sstevel@tonic-gate 	uint8_t ipsr_code;
620Sstevel@tonic-gate 	uint8_t ipsr_len;
630Sstevel@tonic-gate 	uint8_t ipsr_ptr;
640Sstevel@tonic-gate 	/* up to 9 IPv4 addresses */
650Sstevel@tonic-gate 	uint8_t ipsr_addrs[1][sizeof (struct in_addr)];
660Sstevel@tonic-gate };
670Sstevel@tonic-gate 
680Sstevel@tonic-gate int check_reply(struct msghdr *, int, int, uchar_t *, uchar_t *);
690Sstevel@tonic-gate extern ushort_t in_cksum(ushort_t *, int);
700Sstevel@tonic-gate extern char *inet_name(union any_in_addr *, int);
710Sstevel@tonic-gate static char *pr_type(uchar_t);
720Sstevel@tonic-gate void print_addr(uchar_t *, int, struct sockaddr *);
730Sstevel@tonic-gate boolean_t print_icmp_other(uchar_t, uchar_t);
740Sstevel@tonic-gate void send_probe(int, struct sockaddr *, struct ip *, int, int,
750Sstevel@tonic-gate     struct timeval *, int);
760Sstevel@tonic-gate struct ip *set_buffers(int);
770Sstevel@tonic-gate void set_IPv4opt_sourcerouting(int, union any_in_addr *, union any_in_addr *);
780Sstevel@tonic-gate 
790Sstevel@tonic-gate /*
800Sstevel@tonic-gate  * prepares the buffer to be sent as an IP datagram
810Sstevel@tonic-gate  */
820Sstevel@tonic-gate struct ip *
set_buffers(int plen)830Sstevel@tonic-gate set_buffers(int plen)
840Sstevel@tonic-gate {
850Sstevel@tonic-gate 	struct ip *outip;
860Sstevel@tonic-gate 	uchar_t *outp;		/* packet following the IP header (UDP/ICMP) */
870Sstevel@tonic-gate 	struct udphdr *outudp;
880Sstevel@tonic-gate 	struct icmp *outicmp;
890Sstevel@tonic-gate 	int optlen = 0;
900Sstevel@tonic-gate 
910Sstevel@tonic-gate 	outip = (struct ip *)malloc((size_t)plen);
920Sstevel@tonic-gate 	if (outip == NULL) {
930Sstevel@tonic-gate 		Fprintf(stderr, "%s: malloc: %s\n", prog, strerror(errno));
940Sstevel@tonic-gate 		exit(EXIT_FAILURE);
950Sstevel@tonic-gate 	}
960Sstevel@tonic-gate 
970Sstevel@tonic-gate 	if (gw_count > 0) {
980Sstevel@tonic-gate 		/* 8 = 5 (NO OPs) + 3 (code, len, ptr) */
990Sstevel@tonic-gate 		optlen = 8 + gw_count * sizeof (struct in_addr);
1000Sstevel@tonic-gate 	}
1010Sstevel@tonic-gate 
1020Sstevel@tonic-gate 	(void) memset((char *)outip, 0, (size_t)plen);
1030Sstevel@tonic-gate 	outp = (uchar_t *)(outip + 1);
1040Sstevel@tonic-gate 
1050Sstevel@tonic-gate 	outip->ip_v = IPVERSION;
1060Sstevel@tonic-gate 	if (settos)
1070Sstevel@tonic-gate 		outip->ip_tos = tos;
1080Sstevel@tonic-gate 
1090Sstevel@tonic-gate 	/*
1100Sstevel@tonic-gate 	 * LBNL bug fixed: missing '- optlen' before, causing optlen
1110Sstevel@tonic-gate 	 * added twice
1120Sstevel@tonic-gate 	 *
1130Sstevel@tonic-gate 	 * BSD bug: BSD touches the header fields 'len' and 'ip_off'
1140Sstevel@tonic-gate 	 * even when HDRINCL is set. It applies htons() on these
1150Sstevel@tonic-gate 	 * fields. It should send the header untouched when HDRINCL
1160Sstevel@tonic-gate 	 * is set.
1170Sstevel@tonic-gate 	 */
1180Sstevel@tonic-gate 	outip->ip_len = htons(plen - optlen);
1190Sstevel@tonic-gate 	outip->ip_off = htons(off);
1200Sstevel@tonic-gate 	outip->ip_hl = (outp - (uchar_t *)outip) >> 2;
1210Sstevel@tonic-gate 
1220Sstevel@tonic-gate 	/* setup ICMP or UDP */
1230Sstevel@tonic-gate 	if (useicmp) {
1240Sstevel@tonic-gate 		outip->ip_p = IPPROTO_ICMP;
1250Sstevel@tonic-gate 
1260Sstevel@tonic-gate 		/* LINTED E_BAD_PTR_CAST_ALIGN */
1270Sstevel@tonic-gate 		outicmp = (struct icmp *)outp;
1280Sstevel@tonic-gate 		outicmp->icmp_type = ICMP_ECHO;
1290Sstevel@tonic-gate 		outicmp->icmp_id = htons(ident);
1300Sstevel@tonic-gate 	} else {
1310Sstevel@tonic-gate 		outip->ip_p = IPPROTO_UDP;
1320Sstevel@tonic-gate 
1330Sstevel@tonic-gate 		/* LINTED E_BAD_PTR_CAST_ALIGN */
1340Sstevel@tonic-gate 		outudp = (struct udphdr *)outp;
1350Sstevel@tonic-gate 		outudp->uh_sport = htons(ident);
1360Sstevel@tonic-gate 		outudp->uh_ulen =
1370Sstevel@tonic-gate 		    htons((ushort_t)(plen - (sizeof (struct ip) + optlen)));
1380Sstevel@tonic-gate 	}
1390Sstevel@tonic-gate 
1400Sstevel@tonic-gate 	return (outip);
1410Sstevel@tonic-gate }
1420Sstevel@tonic-gate 
1430Sstevel@tonic-gate /*
1440Sstevel@tonic-gate  * Setup the source routing for IPv4.
1450Sstevel@tonic-gate  */
1460Sstevel@tonic-gate void
set_IPv4opt_sourcerouting(int sndsock,union any_in_addr * ip_addr,union any_in_addr * gwIPlist)1470Sstevel@tonic-gate set_IPv4opt_sourcerouting(int sndsock, union any_in_addr *ip_addr,
1480Sstevel@tonic-gate     union any_in_addr *gwIPlist)
1490Sstevel@tonic-gate {
1500Sstevel@tonic-gate 	struct protoent *pe;
1510Sstevel@tonic-gate 	struct ip_sourceroute *srp;
1520Sstevel@tonic-gate 	uchar_t optlist[MAX_IPOPTLEN];
1530Sstevel@tonic-gate 	int i;
154378Sblu 	int gwV4_count;
1550Sstevel@tonic-gate 
1560Sstevel@tonic-gate 	if ((pe = getprotobyname("ip")) == NULL) {
1570Sstevel@tonic-gate 		Fprintf(stderr, "%s: unknown protocol ip\n", prog);
1580Sstevel@tonic-gate 		exit(EXIT_FAILURE);
1590Sstevel@tonic-gate 	}
1600Sstevel@tonic-gate 
161378Sblu 	gwV4_count = (gw_count < MAX_GWS) ? gw_count : MAX_GWS - 1;
1620Sstevel@tonic-gate 	/* final hop */
163378Sblu 	gwIPlist[gwV4_count].addr = ip_addr->addr;
1640Sstevel@tonic-gate 
1650Sstevel@tonic-gate 	/*
1660Sstevel@tonic-gate 	 * the option length passed to setsockopt() needs to be a multiple of
1670Sstevel@tonic-gate 	 * 32 bits. Therefore we need to use a 1-byte padding (source routing
1680Sstevel@tonic-gate 	 * information takes 4x+3 bytes).
1690Sstevel@tonic-gate 	 */
1700Sstevel@tonic-gate 	optlist[0] = IPOPT_NOP;
1710Sstevel@tonic-gate 
1720Sstevel@tonic-gate 	srp = (struct ip_sourceroute *)&optlist[1];
1730Sstevel@tonic-gate 	srp->ipsr_code = IPOPT_LSRR;
1740Sstevel@tonic-gate 	/* 3 = 1 (code) + 1 (len) + 1 (ptr) */
175378Sblu 	srp->ipsr_len = 3 + (gwV4_count + 1) * sizeof (gwIPlist[0].addr);
1760Sstevel@tonic-gate 	srp->ipsr_ptr = IPOPT_MINOFF;
1770Sstevel@tonic-gate 
178378Sblu 	for (i = 0; i <= gwV4_count; i++) {
1790Sstevel@tonic-gate 		(void) bcopy((char *)&gwIPlist[i].addr, &srp->ipsr_addrs[i],
1800Sstevel@tonic-gate 		    sizeof (struct in_addr));
1810Sstevel@tonic-gate 	}
1820Sstevel@tonic-gate 
1830Sstevel@tonic-gate 	if (setsockopt(sndsock, pe->p_proto, IP_OPTIONS, (const char *)optlist,
1840Sstevel@tonic-gate 	    srp->ipsr_len + 1) < 0) {
1850Sstevel@tonic-gate 		Fprintf(stderr, "%s: IP_OPTIONS: %s\n", prog, strerror(errno));
1860Sstevel@tonic-gate 		exit(EXIT_FAILURE);
1870Sstevel@tonic-gate 	}
1880Sstevel@tonic-gate }
1890Sstevel@tonic-gate 
1900Sstevel@tonic-gate /*
1910Sstevel@tonic-gate  * send a probe packet to the destination
1920Sstevel@tonic-gate  */
1930Sstevel@tonic-gate void
send_probe(int sndsock,struct sockaddr * to,struct ip * outip,int seq,int ttl,struct timeval * tp,int packlen)1940Sstevel@tonic-gate send_probe(int sndsock, struct sockaddr *to, struct ip *outip,
1950Sstevel@tonic-gate     int seq, int ttl, struct timeval *tp, int packlen)
1960Sstevel@tonic-gate {
1970Sstevel@tonic-gate 	int cc;
1980Sstevel@tonic-gate 	struct udpiphdr *ui;
1990Sstevel@tonic-gate 	uchar_t *outp;		/* packet following the IP header (UDP/ICMP) */
2000Sstevel@tonic-gate 	struct udphdr *outudp;
2010Sstevel@tonic-gate 	struct icmp *outicmp;
2020Sstevel@tonic-gate 	struct outdata *outdata;
2030Sstevel@tonic-gate 	struct ip tip;
2040Sstevel@tonic-gate 	int optlen = 0;
2050Sstevel@tonic-gate 	int send_size;
2060Sstevel@tonic-gate 
2070Sstevel@tonic-gate 	/* initialize buffer pointers */
2080Sstevel@tonic-gate 	outp = (uchar_t *)(outip + 1);
2090Sstevel@tonic-gate 	/* LINTED E_BAD_PTR_CAST_ALIGN */
2100Sstevel@tonic-gate 	outudp =  (struct udphdr *)outp;
2110Sstevel@tonic-gate 	/* LINTED E_BAD_PTR_CAST_ALIGN */
2120Sstevel@tonic-gate 	outicmp = (struct icmp *)outp;
2130Sstevel@tonic-gate 	/* LINTED E_BAD_PTR_CAST_ALIGN */
2140Sstevel@tonic-gate 	outdata = (struct outdata *)(outp + ICMP_MINLEN);
2150Sstevel@tonic-gate 
2160Sstevel@tonic-gate 	if (gw_count > 0) {
2170Sstevel@tonic-gate 		/* 8 = 5 (NO OPs) + 3 (code, len, ptr) */
2180Sstevel@tonic-gate 		optlen = 8 + gw_count * sizeof (struct in_addr);
2190Sstevel@tonic-gate 	}
2200Sstevel@tonic-gate 
2210Sstevel@tonic-gate 	if (raw_req) {
2220Sstevel@tonic-gate 		send_size = packlen - optlen;
2230Sstevel@tonic-gate 	} else if (useicmp) {
2240Sstevel@tonic-gate 		send_size = packlen - optlen - sizeof (struct ip);
2250Sstevel@tonic-gate 	} else {
2260Sstevel@tonic-gate 		send_size = packlen - optlen - sizeof (struct ip) -
2270Sstevel@tonic-gate 		    sizeof (struct udphdr);
2280Sstevel@tonic-gate 	}
2290Sstevel@tonic-gate 
2300Sstevel@tonic-gate 	outip->ip_ttl = ttl;
2310Sstevel@tonic-gate 	outip->ip_id = htons(ident + seq);
2320Sstevel@tonic-gate 
2330Sstevel@tonic-gate 	/*
2340Sstevel@tonic-gate 	 * If a raw IPv4 packet is going to be sent, the Time to Live
2350Sstevel@tonic-gate 	 * field in the packet was initialized above.  Otherwise, it is
2360Sstevel@tonic-gate 	 * initialized here using the IPPROTO_IP level socket option.
2370Sstevel@tonic-gate 	 */
2380Sstevel@tonic-gate 	if (!raw_req) {
2390Sstevel@tonic-gate 		if (setsockopt(sndsock, IPPROTO_IP, IP_TTL, (char *)&ttl,
2400Sstevel@tonic-gate 		    sizeof (ttl)) < 0) {
2410Sstevel@tonic-gate 			Fprintf(stderr, "%s: IP_TTL: %s\n", prog,
2420Sstevel@tonic-gate 			    strerror(errno));
2430Sstevel@tonic-gate 			exit(EXIT_FAILURE);
2440Sstevel@tonic-gate 		}
2450Sstevel@tonic-gate 	}
2460Sstevel@tonic-gate 
2470Sstevel@tonic-gate 	/*
2480Sstevel@tonic-gate 	 * In most cases, the kernel will recalculate the ip checksum.
2490Sstevel@tonic-gate 	 * But we must do it anyway so that the udp checksum comes out
2500Sstevel@tonic-gate 	 * right.
2510Sstevel@tonic-gate 	 */
2520Sstevel@tonic-gate 	if (docksum) {
2530Sstevel@tonic-gate 		outip->ip_sum =
2540Sstevel@tonic-gate 		    in_cksum((ushort_t *)outip, sizeof (*outip) + optlen);
2550Sstevel@tonic-gate 		if (outip->ip_sum == 0)
2560Sstevel@tonic-gate 			outip->ip_sum = 0xffff;
2570Sstevel@tonic-gate 	}
2580Sstevel@tonic-gate 
2590Sstevel@tonic-gate 	/* Payload */
2600Sstevel@tonic-gate 	outdata->seq = seq;
2610Sstevel@tonic-gate 	outdata->ttl = ttl;
2620Sstevel@tonic-gate 	outdata->tv = *tp;
2630Sstevel@tonic-gate 
2640Sstevel@tonic-gate 	if (useicmp) {
2650Sstevel@tonic-gate 		outicmp->icmp_seq = htons(seq);
2660Sstevel@tonic-gate 	} else {
2670Sstevel@tonic-gate 		outudp->uh_dport  = htons((port + seq) % (MAX_PORT + 1));
2680Sstevel@tonic-gate 	}
2690Sstevel@tonic-gate 
2700Sstevel@tonic-gate 	if (!raw_req)
2710Sstevel@tonic-gate 		/* LINTED E_BAD_PTR_CAST_ALIGN */
2720Sstevel@tonic-gate 		((struct sockaddr_in *)to)->sin_port = outudp->uh_dport;
2730Sstevel@tonic-gate 
2740Sstevel@tonic-gate 	/* (We can only do the checksum if we know our ip address) */
2750Sstevel@tonic-gate 	if (docksum) {
2760Sstevel@tonic-gate 		if (useicmp) {
2770Sstevel@tonic-gate 			outicmp->icmp_cksum = 0;
2780Sstevel@tonic-gate 			outicmp->icmp_cksum = in_cksum((ushort_t *)outicmp,
2790Sstevel@tonic-gate 			    packlen - (sizeof (struct ip) + optlen));
2800Sstevel@tonic-gate 			if (outicmp->icmp_cksum == 0)
2810Sstevel@tonic-gate 				outicmp->icmp_cksum = 0xffff;
2820Sstevel@tonic-gate 		} else {
2830Sstevel@tonic-gate 			/* Checksum (must save and restore ip header) */
2840Sstevel@tonic-gate 			tip = *outip;
2850Sstevel@tonic-gate 			ui = (struct udpiphdr *)outip;
2860Sstevel@tonic-gate 			ui->ui_next = 0;
2870Sstevel@tonic-gate 			ui->ui_prev = 0;
2880Sstevel@tonic-gate 			ui->ui_x1 = 0;
2890Sstevel@tonic-gate 			ui->ui_len = outudp->uh_ulen;
2900Sstevel@tonic-gate 			outudp->uh_sum = 0;
2910Sstevel@tonic-gate 			outudp->uh_sum = in_cksum((ushort_t *)ui, packlen);
2920Sstevel@tonic-gate 			if (outudp->uh_sum == 0)
2930Sstevel@tonic-gate 				outudp->uh_sum = 0xffff;
2940Sstevel@tonic-gate 			*outip = tip;
2950Sstevel@tonic-gate 		}
2960Sstevel@tonic-gate 	}
2970Sstevel@tonic-gate 
2980Sstevel@tonic-gate 	if (raw_req) {
2990Sstevel@tonic-gate 		cc = sendto(sndsock, (char *)outip, send_size, 0, to,
3000Sstevel@tonic-gate 		    sizeof (struct sockaddr_in));
3010Sstevel@tonic-gate 	} else if (useicmp) {
3020Sstevel@tonic-gate 		cc = sendto(sndsock, (char *)outicmp, send_size, 0, to,
3030Sstevel@tonic-gate 		    sizeof (struct sockaddr_in));
3040Sstevel@tonic-gate 	} else {
3050Sstevel@tonic-gate 		cc = sendto(sndsock, (char *)outp, send_size, 0, to,
3060Sstevel@tonic-gate 		    sizeof (struct sockaddr_in));
3070Sstevel@tonic-gate 	}
3080Sstevel@tonic-gate 
3090Sstevel@tonic-gate 	if (cc < 0 || cc != send_size)  {
3100Sstevel@tonic-gate 		if (cc < 0) {
3110Sstevel@tonic-gate 			Fprintf(stderr, "%s: sendto: %s\n", prog,
3120Sstevel@tonic-gate 			    strerror(errno));
3130Sstevel@tonic-gate 		}
3140Sstevel@tonic-gate 		Printf("%s: wrote %s %d chars, ret=%d\n",
3150Sstevel@tonic-gate 		    prog, hostname, send_size, cc);
3160Sstevel@tonic-gate 		(void) fflush(stdout);
3170Sstevel@tonic-gate 	}
3180Sstevel@tonic-gate }
3190Sstevel@tonic-gate 
3200Sstevel@tonic-gate /*
3210Sstevel@tonic-gate  * Check out the reply packet to see if it's what we were expecting.
3220Sstevel@tonic-gate  * Returns REPLY_GOT_TARGET if the reply comes from the target
3230Sstevel@tonic-gate  *         REPLY_GOT_GATEWAY if an intermediate gateway sends TIME_EXCEEDED
3240Sstevel@tonic-gate  *         REPLY_GOT_OTHER for other kinds of unreachables indicating none of
3250Sstevel@tonic-gate  *	   the above two cases
3260Sstevel@tonic-gate  *
3270Sstevel@tonic-gate  * It also sets the icmp type and icmp code values
3280Sstevel@tonic-gate  */
3290Sstevel@tonic-gate int
check_reply(struct msghdr * msg,int cc,int seq,uchar_t * type,uchar_t * code)3300Sstevel@tonic-gate check_reply(struct msghdr *msg, int cc, int seq, uchar_t *type, uchar_t *code)
3310Sstevel@tonic-gate {
3320Sstevel@tonic-gate 	uchar_t *buf = msg->msg_iov->iov_base;
3330Sstevel@tonic-gate 	struct sockaddr_in *from_in = (struct sockaddr_in *)msg->msg_name;
3340Sstevel@tonic-gate 	struct icmp *icp;
3350Sstevel@tonic-gate 	int hlen;
3360Sstevel@tonic-gate 	int save_cc = cc;
3370Sstevel@tonic-gate 	struct ip *ip;
3380Sstevel@tonic-gate 
3390Sstevel@tonic-gate 	/* LINTED E_BAD_PTR_CAST_ALIGN */
3400Sstevel@tonic-gate 	ip = (struct ip *)buf;
3410Sstevel@tonic-gate 	hlen = ip->ip_hl << 2;
3420Sstevel@tonic-gate 	if (cc < hlen + ICMP_MINLEN) {
3430Sstevel@tonic-gate 		if (verbose) {
3440Sstevel@tonic-gate 			Printf("packet too short (%d bytes) from %s\n",
3450Sstevel@tonic-gate 			    cc, inet_ntoa(from_in->sin_addr));
3460Sstevel@tonic-gate 		}
3470Sstevel@tonic-gate 		return (REPLY_SHORT_PKT);
3480Sstevel@tonic-gate 	}
3490Sstevel@tonic-gate 	cc -= hlen;
3500Sstevel@tonic-gate 	/* LINTED E_BAD_PTR_CAST_ALIGN */
3510Sstevel@tonic-gate 	icp = (struct icmp *)(buf + hlen);
3520Sstevel@tonic-gate 
3530Sstevel@tonic-gate 	*type = icp->icmp_type;
3540Sstevel@tonic-gate 	*code = icp->icmp_code;
3550Sstevel@tonic-gate 
3560Sstevel@tonic-gate 	/*
3570Sstevel@tonic-gate 	 * traceroute interpretes only ICMP_TIMXCEED_INTRANS, ICMP_UNREACH and
3580Sstevel@tonic-gate 	 * ICMP_ECHOREPLY, ignores others
3590Sstevel@tonic-gate 	 */
3600Sstevel@tonic-gate 	if ((*type == ICMP_TIMXCEED && *code == ICMP_TIMXCEED_INTRANS) ||
3610Sstevel@tonic-gate 	    *type == ICMP_UNREACH || *type == ICMP_ECHOREPLY) {
3620Sstevel@tonic-gate 		struct ip *hip;
3630Sstevel@tonic-gate 		struct udphdr *up;
3640Sstevel@tonic-gate 		struct icmp *hicmp;
3650Sstevel@tonic-gate 
3660Sstevel@tonic-gate 		cc -= ICMP_MINLEN;
3670Sstevel@tonic-gate 		hip = &icp->icmp_ip;
3680Sstevel@tonic-gate 		hlen = hip->ip_hl << 2;
3690Sstevel@tonic-gate 		cc -= hlen;
3700Sstevel@tonic-gate 		if (useicmp) {
3710Sstevel@tonic-gate 			if (*type == ICMP_ECHOREPLY &&
3720Sstevel@tonic-gate 			    icp->icmp_id == htons(ident) &&
3730Sstevel@tonic-gate 			    icp->icmp_seq == htons(seq))
3740Sstevel@tonic-gate 				return (REPLY_GOT_TARGET);
3750Sstevel@tonic-gate 
3760Sstevel@tonic-gate 			/* LINTED E_BAD_PTR_CAST_ALIGN */
3770Sstevel@tonic-gate 			hicmp = (struct icmp *)((uchar_t *)hip + hlen);
3780Sstevel@tonic-gate 
3790Sstevel@tonic-gate 			if (ICMP_MINLEN <= cc &&
3800Sstevel@tonic-gate 			    hip->ip_p == IPPROTO_ICMP &&
3810Sstevel@tonic-gate 			    hicmp->icmp_id == htons(ident) &&
3820Sstevel@tonic-gate 			    hicmp->icmp_seq == htons(seq)) {
3830Sstevel@tonic-gate 				return ((*type == ICMP_TIMXCEED) ?
3840Sstevel@tonic-gate 				    REPLY_GOT_GATEWAY : REPLY_GOT_OTHER);
3850Sstevel@tonic-gate 			}
3860Sstevel@tonic-gate 		} else {
3870Sstevel@tonic-gate 			/* LINTED E_BAD_PTR_CAST_ALIGN */
3880Sstevel@tonic-gate 			up = (struct udphdr *)((uchar_t *)hip + hlen);
3890Sstevel@tonic-gate 			/*
3900Sstevel@tonic-gate 			 * at least 4 bytes of UDP header is required for this
3910Sstevel@tonic-gate 			 * check
3920Sstevel@tonic-gate 			 */
3930Sstevel@tonic-gate 			if (4 <= cc &&
3940Sstevel@tonic-gate 			    hip->ip_p == IPPROTO_UDP &&
3950Sstevel@tonic-gate 			    up->uh_sport == htons(ident) &&
3960Sstevel@tonic-gate 			    up->uh_dport == htons((port + seq) %
3970Sstevel@tonic-gate 				(MAX_PORT + 1))) {
3980Sstevel@tonic-gate 				if (*type == ICMP_UNREACH &&
3990Sstevel@tonic-gate 				    *code == ICMP_UNREACH_PORT) {
4000Sstevel@tonic-gate 					return (REPLY_GOT_TARGET);
4010Sstevel@tonic-gate 				} else if (*type == ICMP_TIMXCEED) {
4020Sstevel@tonic-gate 					return (REPLY_GOT_GATEWAY);
4030Sstevel@tonic-gate 				} else {
4040Sstevel@tonic-gate 					return (REPLY_GOT_OTHER);
4050Sstevel@tonic-gate 				}
4060Sstevel@tonic-gate 			}
4070Sstevel@tonic-gate 		}
4080Sstevel@tonic-gate 	}
4090Sstevel@tonic-gate 
4100Sstevel@tonic-gate 	if (verbose) {
4110Sstevel@tonic-gate 		int i, j;
4120Sstevel@tonic-gate 		uchar_t *lp = (uchar_t *)ip;
4130Sstevel@tonic-gate 
4140Sstevel@tonic-gate 		cc = save_cc;
4150Sstevel@tonic-gate 		Printf("\n%d bytes from %s to ", cc,
4160Sstevel@tonic-gate 		    inet_ntoa(from_in->sin_addr));
4170Sstevel@tonic-gate 		Printf("%s: icmp type %d (%s) code %d\n",
4180Sstevel@tonic-gate 		    inet_ntoa(ip->ip_dst), *type, pr_type(*type), *code);
4190Sstevel@tonic-gate 		for (i = 0; i < cc; i += 4) {
4200Sstevel@tonic-gate 			Printf("%2d: x", i);
4210Sstevel@tonic-gate 			for (j = 0; ((j < 4) && ((i + j) < cc)); j++)
4220Sstevel@tonic-gate 				Printf("%2.2x", *lp++);
4230Sstevel@tonic-gate 			(void) putchar('\n');
4240Sstevel@tonic-gate 		}
4250Sstevel@tonic-gate 	}
4260Sstevel@tonic-gate 
4270Sstevel@tonic-gate 	return (REPLY_SHORT_PKT);
4280Sstevel@tonic-gate }
4290Sstevel@tonic-gate 
4300Sstevel@tonic-gate /*
4310Sstevel@tonic-gate  * convert an ICMP "type" field to a printable string.
4320Sstevel@tonic-gate  */
4330Sstevel@tonic-gate static char *
pr_type(uchar_t type)4340Sstevel@tonic-gate pr_type(uchar_t type)
4350Sstevel@tonic-gate {
4360Sstevel@tonic-gate 	static struct icmptype_table ttab[] = {
4370Sstevel@tonic-gate 		{ICMP_ECHOREPLY,	"Echo Reply"},
4380Sstevel@tonic-gate 		{1,			"ICMP 1"},
4390Sstevel@tonic-gate 		{2,			"ICMP 2"},
4400Sstevel@tonic-gate 		{ICMP_UNREACH,		"Dest Unreachable"},
4410Sstevel@tonic-gate 		{ICMP_SOURCEQUENCH,	"Source Quench"},
4420Sstevel@tonic-gate 		{ICMP_REDIRECT,		"Redirect"},
4430Sstevel@tonic-gate 		{6,			"ICMP 6"},
4440Sstevel@tonic-gate 		{7,			"ICMP 7"},
4450Sstevel@tonic-gate 		{ICMP_ECHO,		"Echo"},
4460Sstevel@tonic-gate 		{ICMP_ROUTERADVERT,	"Router Advertisement"},
4470Sstevel@tonic-gate 		{ICMP_ROUTERSOLICIT,	"Router Solicitation"},
4480Sstevel@tonic-gate 		{ICMP_TIMXCEED,		"Time Exceeded"},
4490Sstevel@tonic-gate 		{ICMP_PARAMPROB,	"Param Problem"},
4500Sstevel@tonic-gate 		{ICMP_TSTAMP,		"Timestamp"},
4510Sstevel@tonic-gate 		{ICMP_TSTAMPREPLY,	"Timestamp Reply"},
4520Sstevel@tonic-gate 		{ICMP_IREQ,		"Info Request"},
4530Sstevel@tonic-gate 		{ICMP_IREQREPLY,	"Info Reply"},
4540Sstevel@tonic-gate 		{ICMP_MASKREQ,		"Netmask Request"},
4550Sstevel@tonic-gate 		{ICMP_MASKREPLY,	"Netmask Reply"}
4560Sstevel@tonic-gate 	};
4570Sstevel@tonic-gate 	int i = 0;
4580Sstevel@tonic-gate 
4590Sstevel@tonic-gate 	for (i = 0; i < A_CNT(ttab); i++) {
4600Sstevel@tonic-gate 		if (ttab[i].type == type)
4610Sstevel@tonic-gate 			return (ttab[i].message);
4620Sstevel@tonic-gate 	}
4630Sstevel@tonic-gate 
4640Sstevel@tonic-gate 	return ("OUT-OF-RANGE");
4650Sstevel@tonic-gate }
4660Sstevel@tonic-gate 
4670Sstevel@tonic-gate /*
4680Sstevel@tonic-gate  * print the IPv4 src address of the reply packet
4690Sstevel@tonic-gate  */
4700Sstevel@tonic-gate void
print_addr(uchar_t * buf,int cc,struct sockaddr * from)4710Sstevel@tonic-gate print_addr(uchar_t *buf, int cc, struct sockaddr *from)
4720Sstevel@tonic-gate {
4730Sstevel@tonic-gate 	/* LINTED E_BAD_PTR_CAST_ALIGN */
4740Sstevel@tonic-gate 	struct sockaddr_in *from_in = (struct sockaddr_in *)from;
4750Sstevel@tonic-gate 	struct ip *ip;
4760Sstevel@tonic-gate 	union any_in_addr ip_addr;
4770Sstevel@tonic-gate 
4780Sstevel@tonic-gate 	ip_addr.addr = from_in->sin_addr;
4790Sstevel@tonic-gate 
4800Sstevel@tonic-gate 	/* LINTED E_BAD_PTR_CAST_ALIGN */
4810Sstevel@tonic-gate 	ip = (struct ip *)buf;
4820Sstevel@tonic-gate 
4830Sstevel@tonic-gate 	if (nflag) {
4840Sstevel@tonic-gate 		Printf(" %s", inet_ntoa(from_in->sin_addr));
4850Sstevel@tonic-gate 	} else {
4860Sstevel@tonic-gate 		Printf(" %s (%s)", inet_name(&ip_addr, AF_INET),
4870Sstevel@tonic-gate 		    inet_ntoa(from_in->sin_addr));
4880Sstevel@tonic-gate 	}
4890Sstevel@tonic-gate 
4900Sstevel@tonic-gate 	if (verbose)
4910Sstevel@tonic-gate 		Printf(" %d bytes to %s", cc, inet_ntoa(ip->ip_dst));
4920Sstevel@tonic-gate }
4930Sstevel@tonic-gate 
4940Sstevel@tonic-gate /*
4950Sstevel@tonic-gate  * ICMP messages which doesn't mean we got the target, or we got a gateway, are
4960Sstevel@tonic-gate  * processed here. It returns _B_TRUE if it's some sort of 'unreachable'.
4970Sstevel@tonic-gate  */
4980Sstevel@tonic-gate boolean_t
print_icmp_other(uchar_t type,uchar_t code)4990Sstevel@tonic-gate print_icmp_other(uchar_t type, uchar_t code)
5000Sstevel@tonic-gate {
5010Sstevel@tonic-gate 	boolean_t unreach = _B_FALSE;
5020Sstevel@tonic-gate 
5030Sstevel@tonic-gate 	/*
5040Sstevel@tonic-gate 	 * this function only prints '!*' for ICMP unreachable messages,
5050Sstevel@tonic-gate 	 * ignores others.
5060Sstevel@tonic-gate 	 */
5070Sstevel@tonic-gate 	if (type != ICMP_UNREACH) {
5080Sstevel@tonic-gate 		return (_B_FALSE);
5090Sstevel@tonic-gate 	}
5100Sstevel@tonic-gate 
5110Sstevel@tonic-gate 	switch (code) {
5120Sstevel@tonic-gate 	case ICMP_UNREACH_PORT:
5130Sstevel@tonic-gate 		break;
5140Sstevel@tonic-gate 
5150Sstevel@tonic-gate 	case ICMP_UNREACH_NET_UNKNOWN:
5160Sstevel@tonic-gate 	case ICMP_UNREACH_NET:
5170Sstevel@tonic-gate 		unreach = _B_TRUE;
5180Sstevel@tonic-gate 		Printf(" !N");
5190Sstevel@tonic-gate 		break;
5200Sstevel@tonic-gate 
5210Sstevel@tonic-gate 	case ICMP_UNREACH_HOST_UNKNOWN:
5220Sstevel@tonic-gate 	case ICMP_UNREACH_HOST:
5230Sstevel@tonic-gate 		unreach = _B_TRUE;
5240Sstevel@tonic-gate 		Printf(" !H");
5250Sstevel@tonic-gate 		break;
5260Sstevel@tonic-gate 
5270Sstevel@tonic-gate 	case ICMP_UNREACH_PROTOCOL:
5280Sstevel@tonic-gate 		Printf(" !P");
5290Sstevel@tonic-gate 		break;
5300Sstevel@tonic-gate 
5310Sstevel@tonic-gate 	case ICMP_UNREACH_NEEDFRAG:
5320Sstevel@tonic-gate 		unreach = _B_TRUE;
5330Sstevel@tonic-gate 		Printf(" !F");
5340Sstevel@tonic-gate 		break;
5350Sstevel@tonic-gate 
5360Sstevel@tonic-gate 	case ICMP_UNREACH_SRCFAIL:
5370Sstevel@tonic-gate 		unreach = _B_TRUE;
5380Sstevel@tonic-gate 		Printf(" !S");
5390Sstevel@tonic-gate 		break;
5400Sstevel@tonic-gate 
5410Sstevel@tonic-gate 	case ICMP_UNREACH_FILTER_PROHIB:
5420Sstevel@tonic-gate 	case ICMP_UNREACH_NET_PROHIB:
5430Sstevel@tonic-gate 	case ICMP_UNREACH_HOST_PROHIB:
5440Sstevel@tonic-gate 		unreach = _B_TRUE;
5450Sstevel@tonic-gate 		Printf(" !X");
5460Sstevel@tonic-gate 		break;
5470Sstevel@tonic-gate 
5480Sstevel@tonic-gate 	case ICMP_UNREACH_TOSNET:
5490Sstevel@tonic-gate 	case ICMP_UNREACH_TOSHOST:
5500Sstevel@tonic-gate 		unreach = _B_TRUE;
5510Sstevel@tonic-gate 		Printf(" !T");
5520Sstevel@tonic-gate 		break;
5530Sstevel@tonic-gate 
5540Sstevel@tonic-gate 	case ICMP_UNREACH_ISOLATED:
5550Sstevel@tonic-gate 	case ICMP_UNREACH_HOST_PRECEDENCE:
5560Sstevel@tonic-gate 	case ICMP_UNREACH_PRECEDENCE_CUTOFF:
5570Sstevel@tonic-gate 		unreach = _B_TRUE;
5580Sstevel@tonic-gate 		Printf(" !U");
5590Sstevel@tonic-gate 		break;
5600Sstevel@tonic-gate 
5610Sstevel@tonic-gate 	default:
5620Sstevel@tonic-gate 		unreach = _B_TRUE;
5630Sstevel@tonic-gate 		Printf(" !<%d>", code);
5640Sstevel@tonic-gate 		break;
5650Sstevel@tonic-gate 	}
5660Sstevel@tonic-gate 
5670Sstevel@tonic-gate 	return (unreach);
5680Sstevel@tonic-gate }
569