A traceroute applet from vodz. This could probably be slimmed down,

but will do for now...

8 files changed, 1259 insertions, 0 deletions

diff --git a/Config.h b/Config.h
index 051181160..00294f72e 100644
--- a/Config.h
+++ b/Config.h
@@ -114,6 +114,7 @@
 //#define BB_TFTP
 #define BB_TOUCH
 //#define BB_TR
+//#define BB_TRACEROUTE
 #define BB_TRUE_FALSE
 #define BB_TTY
 //#define BB_UNIX2DOS
diff --git a/applets.h b/applets.h
index e6ee3c95e..12a28d5be 100644
--- a/applets.h
+++ b/applets.h
@@ -386,6 +386,9 @@
 #ifdef BB_TR
 	APPLET(tr, tr_main, _BB_DIR_USR_BIN)
 #endif
+#ifdef BB_TRACEROUTE
+	APPLET(traceroute, traceroute_main, _BB_DIR_USR_BIN)
+#endif
 #ifdef BB_TRUE_FALSE
 	APPLET(true, true_main, _BB_DIR_BIN)
 #endif
diff --git a/applets/usage.h b/applets/usage.h
index a19f0fe22..70dafd81c 100644
--- a/applets/usage.h
+++ b/applets/usage.h
@@ -1593,6 +1593,28 @@
 	"$ echo "gdkkn vnqkc" | tr [a-y] [b-z]\n" \
 	"hello world\n" 
 
+#define traceroute_trivial_usage \
+	"[-dnrv] [-m max_ttl] [-p port#] [-q nqueries]\n\
+	[-s src_addr] [-t tos] [-w wait] host [data size]"
+#define traceroute_full_usage \
+	"trace the route ip packets follow going to \"host\"\n" \
+	"Options:\n" \
+	"\t-d\tset SO_DEBUG options to socket\n" \
+	"\t-n\tPrint hop addresses numerically rather than symbolically\n" \
+	"\t-r\tBypass the normal routing tables and send directly to a host\n" \
+	"\t-v\tVerbose output\n" \
+	"\t-m max_ttl\tSet the max time-to-live (max number of hops)\n" \
+	"\t-p port#\tSet the base UDP port number used in probes\n" \
+	"\t\t(default is 33434)\n" \
+	"\t-q nqueries\tSet the number of probes per ``ttl'' to nqueries\n" \
+	"\t\t(default is 3)\n" \
+	"\t-s src_addr\tUse the following IP address as the source address\n" \
+	"\t-t tos\tSet the type-of-service in probe packets to the following value\n" \
+	"\t\t(default 0)\n" \
+	"\t-w wait\tSet the time (in seconds) to wait for a response to a probe\n" \
+	"\t\t(default 3 sec.)."
+
+
 #define true_trivial_usage \
 	""
 #define true_full_usage \
diff --git a/include/applets.h b/include/applets.h
index e6ee3c95e..12a28d5be 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -386,6 +386,9 @@
 #ifdef BB_TR
 	APPLET(tr, tr_main, _BB_DIR_USR_BIN)
 #endif
+#ifdef BB_TRACEROUTE
+	APPLET(traceroute, traceroute_main, _BB_DIR_USR_BIN)
+#endif
 #ifdef BB_TRUE_FALSE
 	APPLET(true, true_main, _BB_DIR_BIN)
 #endif
diff --git a/include/usage.h b/include/usage.h
index a19f0fe22..70dafd81c 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -1593,6 +1593,28 @@
 	"$ echo "gdkkn vnqkc" | tr [a-y] [b-z]\n" \
 	"hello world\n" 
 
+#define traceroute_trivial_usage \
+	"[-dnrv] [-m max_ttl] [-p port#] [-q nqueries]\n\
+	[-s src_addr] [-t tos] [-w wait] host [data size]"
+#define traceroute_full_usage \
+	"trace the route ip packets follow going to \"host\"\n" \
+	"Options:\n" \
+	"\t-d\tset SO_DEBUG options to socket\n" \
+	"\t-n\tPrint hop addresses numerically rather than symbolically\n" \
+	"\t-r\tBypass the normal routing tables and send directly to a host\n" \
+	"\t-v\tVerbose output\n" \
+	"\t-m max_ttl\tSet the max time-to-live (max number of hops)\n" \
+	"\t-p port#\tSet the base UDP port number used in probes\n" \
+	"\t\t(default is 33434)\n" \
+	"\t-q nqueries\tSet the number of probes per ``ttl'' to nqueries\n" \
+	"\t\t(default is 3)\n" \
+	"\t-s src_addr\tUse the following IP address as the source address\n" \
+	"\t-t tos\tSet the type-of-service in probe packets to the following value\n" \
+	"\t\t(default 0)\n" \
+	"\t-w wait\tSet the time (in seconds) to wait for a response to a probe\n" \
+	"\t\t(default 3 sec.)."
+
+
 #define true_trivial_usage \
 	""
 #define true_full_usage \
diff --git a/networking/traceroute.c b/networking/traceroute.c
new file mode 100644
index 000000000..a02be8a9e
--- /dev/null
+++ b/networking/traceroute.c
@@ -0,0 +1,593 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *      The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Van Jacobson.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the University of
+ *      California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * traceroute host  - trace the route ip packets follow going to "host".
+ * Notes
+ * -----
+ * This program must be run by root or be setuid.  (I suggest that
+ * you *don't* make it setuid -- casual use could result in a lot
+ * of unnecessary traffic on our poor, congested nets.)
+ *
+ * I stole the idea for this program from Steve Deering.  Since
+ * the first release, I've learned that had I attended the right
+ * IETF working group meetings, I also could have stolen it from Guy
+ * Almes or Matt Mathis.  I don't know (or care) who came up with
+ * the idea first.  I envy the originators' perspicacity and I'm
+ * glad they didn't keep the idea a secret.
+ *
+ * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
+ * enhancements to the original distribution.
+ *
+ * I've hacked up a round-trip-route version of this that works by
+ * sending a loose-source-routed udp datagram through the destination
+ * back to yourself.  Unfortunately, SO many gateways botch source
+ * routing, the thing is almost worthless.  Maybe one day...
+ *
+ *  -- Van Jacobson (van@helios.ee.lbl.gov)
+ *     Tue Dec 20 03:50:13 PST 1988
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <netdb.h>
+#include <endian.h>
+#include <arpa/inet.h>
+#include <netinet/udp.h>
+#include <netinet/ip.h>
+#include <netinet/ip_icmp.h>
+
+
+#define MAXPACKET       65535   /* max ip packet size */
+#ifndef MAXHOSTNAMELEN
+#define MAXHOSTNAMELEN  64
+#endif
+
+/*
+ * format of a (udp) probe packet.
+ */
+struct opacket {
+	struct ip ip;
+	struct udphdr udp;
+	u_char seq;             /* sequence number of this packet */
+	u_char ttl;             /* ttl packet left with */
+	struct timeval tv;      /* time packet left */
+};
+
+/*
+ * Definitions for internet protocol version 4.
+ * Per RFC 791, September 1981.
+ */
+#define IPVERSION       4
+
+
+#include "busybox.h"
+
+static int wait_for_reply (int, struct sockaddr_in *, int);
+static void send_probe (int, int);
+static double deltaT (struct timeval *, struct timeval *);
+static int packet_ok (u_char *, int, struct sockaddr_in *, int);
+static void print (u_char *, int, struct sockaddr_in *);
+static char *inetname (struct in_addr);
+
+static u_char  packet[512];            /* last inbound (icmp) packet */
+static struct opacket  *outpacket;     /* last output (udp) packet */
+
+static int s;                          /* receive (icmp) socket file descriptor */
+static int sndsock;                    /* send (udp) socket file descriptor */
+
+static struct sockaddr whereto;        /* Who to try to reach */
+static int datalen;                    /* How much data */
+
+static char *hostname;
+
+static int max_ttl = 30;
+static u_short ident;
+static u_short port = 32768+666;       /* start udp dest port # for probe packets */
+
+static int verbose;
+static int waittime = 5;               /* time to wait for response (in seconds) */
+static int nflag;                      /* print addresses numerically */
+
+int
+#ifndef BB_TRACEROUTE
+main(argc, argv)
+#else
+traceroute_main(argc, argv)
+#endif
+	int argc;
+	char *argv[];
+{
+	extern char *optarg;
+	extern int optind;
+	struct hostent *hp;
+	struct protoent *pe;
+	struct sockaddr_in from, *to;
+	int ch, i, on, probe, seq, tos, ttl;
+
+	int options = 0;                /* socket options */
+	char *source = 0;
+	int nprobes = 3;
+
+	on = 1;
+	seq = tos = 0;
+	to = (struct sockaddr_in *)&whereto;
+	while ((ch = getopt(argc, argv, "dm:np:q:rs:t:w:v")) != EOF)
+		switch(ch) {
+		case 'd':
+			options |= SO_DEBUG;
+			break;
+		case 'm':
+			max_ttl = atoi(optarg);
+			if (max_ttl <= 1)
+				error_msg_and_die("max ttl must be >1.");
+			break;
+		case 'n':
+			nflag++;
+			break;
+		case 'p':
+			port = atoi(optarg);
+			if (port < 1)
+				error_msg_and_die("port must be >0.");
+			break;
+		case 'q':
+			nprobes = atoi(optarg);
+			if (nprobes < 1)
+				error_msg_and_die("nprobes must be >0.");
+			break;
+		case 'r':
+			options |= SO_DONTROUTE;
+			break;
+		case 's':
+			/*
+			 * set the ip source address of the outbound
+			 * probe (e.g., on a multi-homed host).
+			 */
+			source = optarg;
+			break;
+		case 't':
+			tos = atoi(optarg);
+			if (tos < 0 || tos > 255)
+				error_msg_and_die("tos must be 0 to 255.");
+			break;
+		case 'v':
+			verbose++;
+			break;
+		case 'w':
+			waittime = atoi(optarg);
+			if (waittime <= 1)
+				error_msg_and_die("wait must be >1 sec.");
+			break;
+		default:
+			show_usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (argc < 1)
+		show_usage();
+
+	setlinebuf (stdout);
+
+	(void) bzero((char *)&whereto, sizeof(struct sockaddr));
+	to->sin_family = AF_INET;
+	to->sin_addr.s_addr = inet_addr(*argv);
+	if (to->sin_addr.s_addr != -1)
+		hostname = *argv;
+	else {
+		hp = gethostbyname(*argv);
+		if (hp) {
+			to->sin_family = hp->h_addrtype;
+			bcopy(hp->h_addr, (caddr_t)&to->sin_addr, hp->h_length);
+			hostname = (char *)hp->h_name;
+		} else {
+			error_msg_and_die("unknown host %s", *argv);
+		}
+	}
+	if (*++argv)
+		datalen = atoi(*argv);
+	if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket))
+		error_msg_and_die("packet size must be 0 <= s < %d.",
+		    MAXPACKET - sizeof(struct opacket));
+	datalen += sizeof(struct opacket);
+	outpacket = (struct opacket *)xmalloc((unsigned)datalen);
+	(void) bzero((char *)outpacket, datalen);
+	outpacket->ip.ip_dst = to->sin_addr;
+	outpacket->ip.ip_tos = tos;
+	outpacket->ip.ip_v = IPVERSION;
+	outpacket->ip.ip_id = 0;
+
+	ident = (getpid() & 0xffff) | 0x8000;
+
+	if ((pe = getprotobyname("icmp")) == NULL)
+		error_msg_and_die("icmp: unknown protocol");
+	if ((s = socket(AF_INET, SOCK_RAW, pe->p_proto)) < 0)
+		perror_msg_and_die("icmp socket");
+	if (options & SO_DEBUG)
+		(void) setsockopt(s, SOL_SOCKET, SO_DEBUG,
+				  (char *)&on, sizeof(on));
+	if (options & SO_DONTROUTE)
+		(void) setsockopt(s, SOL_SOCKET, SO_DONTROUTE,
+				  (char *)&on, sizeof(on));
+
+	if ((sndsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
+		perror_msg_and_die("raw socket");
+#ifdef SO_SNDBUF
+	if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen,
+		       sizeof(datalen)) < 0)
+		perror_msg_and_die("SO_SNDBUF");
+#endif SO_SNDBUF
+#ifdef IP_HDRINCL
+	if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, (char *)&on,
+		       sizeof(on)) < 0)
+		perror_msg_and_die("IP_HDRINCL");
+#endif IP_HDRINCL
+	if (options & SO_DEBUG)
+		(void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
+				  (char *)&on, sizeof(on));
+	if (options & SO_DONTROUTE)
+		(void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
+				  (char *)&on, sizeof(on));
+
+	if (source) {
+		(void) bzero((char *)&from, sizeof(struct sockaddr));
+		from.sin_family = AF_INET;
+		from.sin_addr.s_addr = inet_addr(source);
+		if (from.sin_addr.s_addr == -1)
+			error_msg_and_die("unknown host %s", source);
+		outpacket->ip.ip_src = from.sin_addr;
+#ifndef IP_HDRINCL
+		if (bind(sndsock, (struct sockaddr *)&from, sizeof(from)) < 0)
+			perror_msg_and_die("bind");
+#endif IP_HDRINCL
+	}
+
+	fprintf(stderr, "traceroute to %s (%s)", hostname,
+		inet_ntoa(to->sin_addr));
+	if (source)
+		fprintf(stderr, " from %s", source);
+	fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, datalen);
+	(void) fflush(stderr);
+
+	for (ttl = 1; ttl <= max_ttl; ++ttl) {
+		u_long lastaddr = 0;
+		int got_there = 0;
+		int unreachable = 0;
+
+		printf("%2d ", ttl);
+		for (probe = 0; probe < nprobes; ++probe) {
+			int cc, reset_timer;
+			struct timeval t1, t2;
+			struct timezone tz;
+			struct ip *ip;
+
+			(void) gettimeofday(&t1, &tz);
+			send_probe(++seq, ttl);
+			reset_timer = 1;
+			while ((cc = wait_for_reply(s, &from, reset_timer)) != 0) {
+				(void) gettimeofday(&t2, &tz);
+				if ((i = packet_ok(packet, cc, &from, seq))) {
+					reset_timer = 1;
+					if (from.sin_addr.s_addr != lastaddr) {
+						print(packet, cc, &from);
+						lastaddr = from.sin_addr.s_addr;
+					}
+					printf("  %g ms", deltaT(&t1, &t2));
+					switch(i - 1) {
+					case ICMP_UNREACH_PORT:
+#ifndef ARCHAIC
+						ip = (struct ip *)packet;
+						if (ip->ip_ttl <= 1)
+							printf(" !");
+#endif ARCHAIC
+						++got_there;
+						break;
+					case ICMP_UNREACH_NET:
+						++unreachable;
+						printf(" !N");
+						break;
+					case ICMP_UNREACH_HOST:
+						++unreachable;
+						printf(" !H");
+						break;
+					case ICMP_UNREACH_PROTOCOL:
+						++got_there;
+						printf(" !P");
+						break;
+					case ICMP_UNREACH_NEEDFRAG:
+						++unreachable;
+						printf(" !F");
+						break;
+					case ICMP_UNREACH_SRCFAIL:
+						++unreachable;
+						printf(" !S");
+						break;
+					}
+					break;
+				} else
+					reset_timer = 0;
+			}
+			if (cc == 0)
+				printf(" *");
+			(void) fflush(stdout);
+		}
+		putchar('\n');
+		if (got_there || unreachable >= nprobes-1)
+			exit(0);
+	}
+
+	return 0;
+}
+
+static int
+wait_for_reply(sock, from, reset_timer)
+	int sock;
+	struct sockaddr_in *from;
+	int reset_timer;
+{
+	fd_set fds;
+	static struct timeval wait;
+	int cc = 0;
+	int fromlen = sizeof (*from);
+
+	FD_ZERO(&fds);
+	FD_SET(sock, &fds);
+	if (reset_timer) {
+		/*
+		 * traceroute could hang if someone else has a ping
+		 * running and our ICMP reply gets dropped but we don't
+		 * realize it because we keep waking up to handle those
+		 * other ICMP packets that keep coming in.  To fix this,
+		 * "reset_timer" will only be true if the last packet that
+		 * came in was for us or if this is the first time we're
+		 * waiting for a reply since sending out a probe.  Note
+		 * that this takes advantage of the select() feature on
+		 * Linux where the remaining timeout is written to the
+		 * struct timeval area.
+		 */
+		wait.tv_sec = waittime;
+		wait.tv_usec = 0;
+	}
+
+	if (select(sock+1, &fds, (fd_set *)0, (fd_set *)0, &wait) > 0)
+		cc=recvfrom(s, (char *)packet, sizeof(packet), 0,
+			    (struct sockaddr *)from, &fromlen);
+
+	return(cc);
+}
+
+
+static void
+send_probe(seq, ttl)
+	int seq, ttl;
+{
+	struct opacket *op = outpacket;
+	struct ip *ip = &op->ip;
+	struct udphdr *up = &op->udp;
+	int i;
+	struct timezone tz;
+
+	ip->ip_off = 0;
+	ip->ip_hl = sizeof(*ip) >> 2;
+	ip->ip_p = IPPROTO_UDP;
+	ip->ip_len = datalen;
+	ip->ip_ttl = ttl;
+	ip->ip_v = IPVERSION;
+	ip->ip_id = htons(ident+seq);
+
+	up->source = htons(ident);
+	up->dest = htons(port+seq);
+	up->len = htons((u_short)(datalen - sizeof(struct ip)));
+	up->check = 0;
+
+	op->seq = seq;
+	op->ttl = ttl;
+	(void) gettimeofday(&op->tv, &tz);
+
+	i = sendto(sndsock, (char *)outpacket, datalen, 0, &whereto,
+		   sizeof(struct sockaddr));
+	if (i < 0 || i != datalen)  {
+		if (i<0)
+			perror("sendto");
+		printf("traceroute: wrote %s %d chars, ret=%d\n", hostname,
+			datalen, i);
+		(void) fflush(stdout);
+	}
+}
+
+
+static double
+deltaT(t1p, t2p)
+	struct timeval *t1p, *t2p;
+{
+	register double dt;
+
+	dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
+	     (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
+	return (dt);
+}
+
+
+/*
+ * Convert an ICMP "type" field to a printable string.
+ */
+static const char *
+pr_type(t)
+	u_char t;
+{
+	static const char * const ttab[] = {
+	"Echo Reply",   "ICMP 1",       "ICMP 2",       "Dest Unreachable",
+	"Source Quench", "Redirect",    "ICMP 6",       "ICMP 7",
+	"Echo",         "ICMP 9",       "ICMP 10",      "Time Exceeded",
+	"Param Problem", "Timestamp",   "Timestamp Reply", "Info Request",
+	"Info Reply"
+	};
+
+	if(t > 16)
+		return("OUT-OF-RANGE");
+
+	return(ttab[t]);
+}
+
+
+static int
+packet_ok(buf, cc, from, seq)
+	u_char *buf;
+	int cc;
+	struct sockaddr_in *from;
+	int seq;
+{
+	register struct icmp *icp;
+	u_char type, code;
+	int hlen;
+#ifndef ARCHAIC
+	struct ip *ip;
+
+	ip = (struct ip *) buf;
+	hlen = ip->ip_hl << 2;
+	if (cc < hlen + ICMP_MINLEN) {
+		if (verbose)
+			printf("packet too short (%d bytes) from %s\n", cc,
+				inet_ntoa(from->sin_addr));
+		return (0);
+	}
+	cc -= hlen;
+	icp = (struct icmp *)(buf + hlen);
+#else
+	icp = (struct icmp *)buf;
+#endif ARCHAIC
+	type = icp->icmp_type; code = icp->icmp_code;
+	if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) ||
+	    type == ICMP_UNREACH) {
+		struct ip *hip;
+		struct udphdr *up;
+
+		hip = &icp->icmp_ip;
+		hlen = hip->ip_hl << 2;
+		up = (struct udphdr *)((u_char *)hip + hlen);
+		if (hlen + 12 <= cc && hip->ip_p == IPPROTO_UDP &&
+		    up->source == htons(ident) &&
+		    up->dest == htons(port+seq))
+			return (type == ICMP_TIMXCEED? -1 : code+1);
+	}
+#ifndef ARCHAIC
+	if (verbose) {
+		int i;
+		u_long *lp = (u_long *)&icp->icmp_ip;
+
+		printf("\n%d bytes from %s to %s", cc,
+			inet_ntoa(from->sin_addr), inet_ntoa(ip->ip_dst));
+		printf(": icmp type %d (%s) code %d\n", type, pr_type(type),
+		       icp->icmp_code);
+		for (i = 4; i < cc ; i += sizeof(long))
+			printf("%2d: x%8.8lx\n", i, *lp++);
+	}
+#endif ARCHAIC
+	return(0);
+}
+
+
+static void
+print(buf, cc, from)
+	u_char *buf;
+	int cc;
+	struct sockaddr_in *from;
+{
+	struct ip *ip;
+	int hlen;
+
+	ip = (struct ip *) buf;
+	hlen = ip->ip_hl << 2;
+	cc -= hlen;
+
+	if (nflag)
+		printf(" %s", inet_ntoa(from->sin_addr));
+	else
+		printf(" %s (%s)", inetname(from->sin_addr),
+		       inet_ntoa(from->sin_addr));
+
+	if (verbose)
+		printf (" %d bytes to %s", cc, inet_ntoa (ip->ip_dst));
+}
+
+
+/*
+ * Construct an Internet address representation.
+ * If the nflag has been supplied, give
+ * numeric value, otherwise try for symbolic name.
+ */
+static char *
+inetname(in)
+	struct in_addr in;
+{
+	register char *cp;
+	static char line[50];
+	struct hostent *hp;
+	static char domain[MAXHOSTNAMELEN + 1];
+	static int first = 1;
+
+	if (first && !nflag) {
+		first = 0;
+		if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
+		    (cp = index(domain, '.')))
+			(void) strcpy(domain, cp + 1);
+		else
+			domain[0] = 0;
+	}
+	cp = 0;
+	if (!nflag && in.s_addr != INADDR_ANY) {
+		hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
+		if (hp) {
+			if ((cp = index(hp->h_name, '.')) &&
+			    !strcmp(cp + 1, domain))
+				*cp = 0;
+			cp = (char *)hp->h_name;
+		}
+	}
+	if (cp)
+		(void) strcpy(line, cp);
+	else {
+		in.s_addr = ntohl(in.s_addr);
+#define C(x)    ((x) & 0xff)
+		sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24),
+			C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
+	}
+	return (line);
+}
diff --git a/traceroute.c b/traceroute.c
new file mode 100644
index 000000000..a02be8a9e
--- /dev/null
+++ b/traceroute.c
@@ -0,0 +1,593 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *      The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Van Jacobson.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the University of
+ *      California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * traceroute host  - trace the route ip packets follow going to "host".
+ * Notes
+ * -----
+ * This program must be run by root or be setuid.  (I suggest that
+ * you *don't* make it setuid -- casual use could result in a lot
+ * of unnecessary traffic on our poor, congested nets.)
+ *
+ * I stole the idea for this program from Steve Deering.  Since
+ * the first release, I've learned that had I attended the right
+ * IETF working group meetings, I also could have stolen it from Guy
+ * Almes or Matt Mathis.  I don't know (or care) who came up with
+ * the idea first.  I envy the originators' perspicacity and I'm
+ * glad they didn't keep the idea a secret.
+ *
+ * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
+ * enhancements to the original distribution.
+ *
+ * I've hacked up a round-trip-route version of this that works by
+ * sending a loose-source-routed udp datagram through the destination
+ * back to yourself.  Unfortunately, SO many gateways botch source
+ * routing, the thing is almost worthless.  Maybe one day...
+ *
+ *  -- Van Jacobson (van@helios.ee.lbl.gov)
+ *     Tue Dec 20 03:50:13 PST 1988
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <netdb.h>
+#include <endian.h>
+#include <arpa/inet.h>
+#include <netinet/udp.h>
+#include <netinet/ip.h>
+#include <netinet/ip_icmp.h>
+
+
+#define MAXPACKET       65535   /* max ip packet size */
+#ifndef MAXHOSTNAMELEN
+#define MAXHOSTNAMELEN  64
+#endif
+
+/*
+ * format of a (udp) probe packet.
+ */
+struct opacket {
+	struct ip ip;
+	struct udphdr udp;
+	u_char seq;             /* sequence number of this packet */
+	u_char ttl;             /* ttl packet left with */
+	struct timeval tv;      /* time packet left */
+};
+
+/*
+ * Definitions for internet protocol version 4.
+ * Per RFC 791, September 1981.
+ */
+#define IPVERSION       4
+
+
+#include "busybox.h"
+
+static int wait_for_reply (int, struct sockaddr_in *, int);
+static void send_probe (int, int);
+static double deltaT (struct timeval *, struct timeval *);
+static int packet_ok (u_char *, int, struct sockaddr_in *, int);
+static void print (u_char *, int, struct sockaddr_in *);
+static char *inetname (struct in_addr);
+
+static u_char  packet[512];            /* last inbound (icmp) packet */
+static struct opacket  *outpacket;     /* last output (udp) packet */
+
+static int s;                          /* receive (icmp) socket file descriptor */
+static int sndsock;                    /* send (udp) socket file descriptor */
+
+static struct sockaddr whereto;        /* Who to try to reach */
+static int datalen;                    /* How much data */
+
+static char *hostname;
+
+static int max_ttl = 30;
+static u_short ident;
+static u_short port = 32768+666;       /* start udp dest port # for probe packets */
+
+static int verbose;
+static int waittime = 5;               /* time to wait for response (in seconds) */
+static int nflag;                      /* print addresses numerically */
+
+int
+#ifndef BB_TRACEROUTE
+main(argc, argv)
+#else
+traceroute_main(argc, argv)
+#endif
+	int argc;
+	char *argv[];
+{
+	extern char *optarg;
+	extern int optind;
+	struct hostent *hp;
+	struct protoent *pe;
+	struct sockaddr_in from, *to;
+	int ch, i, on, probe, seq, tos, ttl;
+
+	int options = 0;                /* socket options */
+	char *source = 0;
+	int nprobes = 3;
+
+	on = 1;
+	seq = tos = 0;
+	to = (struct sockaddr_in *)&whereto;
+	while ((ch = getopt(argc, argv, "dm:np:q:rs:t:w:v")) != EOF)
+		switch(ch) {
+		case 'd':
+			options |= SO_DEBUG;
+			break;
+		case 'm':
+			max_ttl = atoi(optarg);
+			if (max_ttl <= 1)
+				error_msg_and_die("max ttl must be >1.");
+			break;
+		case 'n':
+			nflag++;
+			break;
+		case 'p':
+			port = atoi(optarg);
+			if (port < 1)
+				error_msg_and_die("port must be >0.");
+			break;
+		case 'q':
+			nprobes = atoi(optarg);
+			if (nprobes < 1)
+				error_msg_and_die("nprobes must be >0.");
+			break;
+		case 'r':
+			options |= SO_DONTROUTE;
+			break;
+		case 's':
+			/*
+			 * set the ip source address of the outbound
+			 * probe (e.g., on a multi-homed host).
+			 */
+			source = optarg;
+			break;
+		case 't':
+			tos = atoi(optarg);
+			if (tos < 0 || tos > 255)
+				error_msg_and_die("tos must be 0 to 255.");
+			break;
+		case 'v':
+			verbose++;
+			break;
+		case 'w':
+			waittime = atoi(optarg);
+			if (waittime <= 1)
+				error_msg_and_die("wait must be >1 sec.");
+			break;
+		default:
+			show_usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (argc < 1)
+		show_usage();
+
+	setlinebuf (stdout);
+
+	(void) bzero((char *)&whereto, sizeof(struct sockaddr));
+	to->sin_family = AF_INET;
+	to->sin_addr.s_addr = inet_addr(*argv);
+	if (to->sin_addr.s_addr != -1)
+		hostname = *argv;
+	else {
+		hp = gethostbyname(*argv);
+		if (hp) {
+			to->sin_family = hp->h_addrtype;
+			bcopy(hp->h_addr, (caddr_t)&to->sin_addr, hp->h_length);
+			hostname = (char *)hp->h_name;
+		} else {
+			error_msg_and_die("unknown host %s", *argv);
+		}
+	}
+	if (*++argv)
+		datalen = atoi(*argv);
+	if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket))
+		error_msg_and_die("packet size must be 0 <= s < %d.",
+		    MAXPACKET - sizeof(struct opacket));
+	datalen += sizeof(struct opacket);
+	outpacket = (struct opacket *)xmalloc((unsigned)datalen);
+	(void) bzero((char *)outpacket, datalen);
+	outpacket->ip.ip_dst = to->sin_addr;
+	outpacket->ip.ip_tos = tos;
+	outpacket->ip.ip_v = IPVERSION;
+	outpacket->ip.ip_id = 0;
+
+	ident = (getpid() & 0xffff) | 0x8000;
+
+	if ((pe = getprotobyname("icmp")) == NULL)
+		error_msg_and_die("icmp: unknown protocol");
+	if ((s = socket(AF_INET, SOCK_RAW, pe->p_proto)) < 0)
+		perror_msg_and_die("icmp socket");
+	if (options & SO_DEBUG)
+		(void) setsockopt(s, SOL_SOCKET, SO_DEBUG,
+				  (char *)&on, sizeof(on));
+	if (options & SO_DONTROUTE)
+		(void) setsockopt(s, SOL_SOCKET, SO_DONTROUTE,
+				  (char *)&on, sizeof(on));
+
+	if ((sndsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
+		perror_msg_and_die("raw socket");
+#ifdef SO_SNDBUF
+	if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen,
+		       sizeof(datalen)) < 0)
+		perror_msg_and_die("SO_SNDBUF");
+#endif SO_SNDBUF
+#ifdef IP_HDRINCL
+	if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, (char *)&on,
+		       sizeof(on)) < 0)
+		perror_msg_and_die("IP_HDRINCL");
+#endif IP_HDRINCL
+	if (options & SO_DEBUG)
+		(void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
+				  (char *)&on, sizeof(on));
+	if (options & SO_DONTROUTE)
+		(void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
+				  (char *)&on, sizeof(on));
+
+	if (source) {
+		(void) bzero((char *)&from, sizeof(struct sockaddr));
+		from.sin_family = AF_INET;
+		from.sin_addr.s_addr = inet_addr(source);
+		if (from.sin_addr.s_addr == -1)
+			error_msg_and_die("unknown host %s", source);
+		outpacket->ip.ip_src = from.sin_addr;
+#ifndef IP_HDRINCL
+		if (bind(sndsock, (struct sockaddr *)&from, sizeof(from)) < 0)
+			perror_msg_and_die("bind");
+#endif IP_HDRINCL
+	}
+
+	fprintf(stderr, "traceroute to %s (%s)", hostname,
+		inet_ntoa(to->sin_addr));
+	if (source)
+		fprintf(stderr, " from %s", source);
+	fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, datalen);
+	(void) fflush(stderr);
+
+	for (ttl = 1; ttl <= max_ttl; ++ttl) {
+		u_long lastaddr = 0;
+		int got_there = 0;
+		int unreachable = 0;
+
+		printf("%2d ", ttl);
+		for (probe = 0; probe < nprobes; ++probe) {
+			int cc, reset_timer;
+			struct timeval t1, t2;
+			struct timezone tz;
+			struct ip *ip;
+
+			(void) gettimeofday(&t1, &tz);
+			send_probe(++seq, ttl);
+			reset_timer = 1;
+			while ((cc = wait_for_reply(s, &from, reset_timer)) != 0) {
+				(void) gettimeofday(&t2, &tz);
+				if ((i = packet_ok(packet, cc, &from, seq))) {
+					reset_timer = 1;
+					if (from.sin_addr.s_addr != lastaddr) {
+						print(packet, cc, &from);
+						lastaddr = from.sin_addr.s_addr;
+					}
+					printf("  %g ms", deltaT(&t1, &t2));
+					switch(i - 1) {
+					case ICMP_UNREACH_PORT:
+#ifndef ARCHAIC
+						ip = (struct ip *)packet;
+						if (ip->ip_ttl <= 1)
+							printf(" !");
+#endif ARCHAIC
+						++got_there;
+						break;
+					case ICMP_UNREACH_NET:
+						++unreachable;
+						printf(" !N");
+						break;
+					case ICMP_UNREACH_HOST:
+						++unreachable;
+						printf(" !H");
+						break;
+					case ICMP_UNREACH_PROTOCOL:
+						++got_there;
+						printf(" !P");
+						break;
+					case ICMP_UNREACH_NEEDFRAG:
+						++unreachable;
+						printf(" !F");
+						break;
+					case ICMP_UNREACH_SRCFAIL:
+						++unreachable;
+						printf(" !S");
+						break;
+					}
+					break;
+				} else
+					reset_timer = 0;
+			}
+			if (cc == 0)
+				printf(" *");
+			(void) fflush(stdout);
+		}
+		putchar('\n');
+		if (got_there || unreachable >= nprobes-1)
+			exit(0);
+	}
+
+	return 0;
+}
+
+static int
+wait_for_reply(sock, from, reset_timer)
+	int sock;
+	struct sockaddr_in *from;
+	int reset_timer;
+{
+	fd_set fds;
+	static struct timeval wait;
+	int cc = 0;
+	int fromlen = sizeof (*from);
+
+	FD_ZERO(&fds);
+	FD_SET(sock, &fds);
+	if (reset_timer) {
+		/*
+		 * traceroute could hang if someone else has a ping
+		 * running and our ICMP reply gets dropped but we don't
+		 * realize it because we keep waking up to handle those
+		 * other ICMP packets that keep coming in.  To fix this,
+		 * "reset_timer" will only be true if the last packet that
+		 * came in was for us or if this is the first time we're
+		 * waiting for a reply since sending out a probe.  Note
+		 * that this takes advantage of the select() feature on
+		 * Linux where the remaining timeout is written to the
+		 * struct timeval area.
+		 */
+		wait.tv_sec = waittime;
+		wait.tv_usec = 0;
+	}
+
+	if (select(sock+1, &fds, (fd_set *)0, (fd_set *)0, &wait) > 0)
+		cc=recvfrom(s, (char *)packet, sizeof(packet), 0,
+			    (struct sockaddr *)from, &fromlen);
+
+	return(cc);
+}
+
+
+static void
+send_probe(seq, ttl)
+	int seq, ttl;
+{
+	struct opacket *op = outpacket;
+	struct ip *ip = &op->ip;
+	struct udphdr *up = &op->udp;
+	int i;
+	struct timezone tz;
+
+	ip->ip_off = 0;
+	ip->ip_hl = sizeof(*ip) >> 2;
+	ip->ip_p = IPPROTO_UDP;
+	ip->ip_len = datalen;
+	ip->ip_ttl = ttl;
+	ip->ip_v = IPVERSION;
+	ip->ip_id = htons(ident+seq);
+
+	up->source = htons(ident);
+	up->dest = htons(port+seq);
+	up->len = htons((u_short)(datalen - sizeof(struct ip)));
+	up->check = 0;
+
+	op->seq = seq;
+	op->ttl = ttl;
+	(void) gettimeofday(&op->tv, &tz);
+
+	i = sendto(sndsock, (char *)outpacket, datalen, 0, &whereto,
+		   sizeof(struct sockaddr));
+	if (i < 0 || i != datalen)  {
+		if (i<0)
+			perror("sendto");
+		printf("traceroute: wrote %s %d chars, ret=%d\n", hostname,
+			datalen, i);
+		(void) fflush(stdout);
+	}
+}
+
+
+static double
+deltaT(t1p, t2p)
+	struct timeval *t1p, *t2p;
+{
+	register double dt;
+
+	dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
+	     (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
+	return (dt);
+}
+
+
+/*
+ * Convert an ICMP "type" field to a printable string.
+ */
+static const char *
+pr_type(t)
+	u_char t;
+{
+	static const char * const ttab[] = {
+	"Echo Reply",   "ICMP 1",       "ICMP 2",       "Dest Unreachable",
+	"Source Quench", "Redirect",    "ICMP 6",       "ICMP 7",
+	"Echo",         "ICMP 9",       "ICMP 10",      "Time Exceeded",
+	"Param Problem", "Timestamp",   "Timestamp Reply", "Info Request",
+	"Info Reply"
+	};
+
+	if(t > 16)
+		return("OUT-OF-RANGE");
+
+	return(ttab[t]);
+}
+
+
+static int
+packet_ok(buf, cc, from, seq)
+	u_char *buf;
+	int cc;
+	struct sockaddr_in *from;
+	int seq;
+{
+	register struct icmp *icp;
+	u_char type, code;
+	int hlen;
+#ifndef ARCHAIC
+	struct ip *ip;
+
+	ip = (struct ip *) buf;
+	hlen = ip->ip_hl << 2;
+	if (cc < hlen + ICMP_MINLEN) {
+		if (verbose)
+			printf("packet too short (%d bytes) from %s\n", cc,
+				inet_ntoa(from->sin_addr));
+		return (0);
+	}
+	cc -= hlen;
+	icp = (struct icmp *)(buf + hlen);
+#else
+	icp = (struct icmp *)buf;
+#endif ARCHAIC
+	type = icp->icmp_type; code = icp->icmp_code;
+	if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) ||
+	    type == ICMP_UNREACH) {
+		struct ip *hip;
+		struct udphdr *up;
+
+		hip = &icp->icmp_ip;
+		hlen = hip->ip_hl << 2;
+		up = (struct udphdr *)((u_char *)hip + hlen);
+		if (hlen + 12 <= cc && hip->ip_p == IPPROTO_UDP &&
+		    up->source == htons(ident) &&
+		    up->dest == htons(port+seq))
+			return (type == ICMP_TIMXCEED? -1 : code+1);
+	}
+#ifndef ARCHAIC
+	if (verbose) {
+		int i;
+		u_long *lp = (u_long *)&icp->icmp_ip;
+
+		printf("\n%d bytes from %s to %s", cc,
+			inet_ntoa(from->sin_addr), inet_ntoa(ip->ip_dst));
+		printf(": icmp type %d (%s) code %d\n", type, pr_type(type),
+		       icp->icmp_code);
+		for (i = 4; i < cc ; i += sizeof(long))
+			printf("%2d: x%8.8lx\n", i, *lp++);
+	}
+#endif ARCHAIC
+	return(0);
+}
+
+
+static void
+print(buf, cc, from)
+	u_char *buf;
+	int cc;
+	struct sockaddr_in *from;
+{
+	struct ip *ip;
+	int hlen;
+
+	ip = (struct ip *) buf;
+	hlen = ip->ip_hl << 2;
+	cc -= hlen;
+
+	if (nflag)
+		printf(" %s", inet_ntoa(from->sin_addr));
+	else
+		printf(" %s (%s)", inetname(from->sin_addr),
+		       inet_ntoa(from->sin_addr));
+
+	if (verbose)
+		printf (" %d bytes to %s", cc, inet_ntoa (ip->ip_dst));
+}
+
+
+/*
+ * Construct an Internet address representation.
+ * If the nflag has been supplied, give
+ * numeric value, otherwise try for symbolic name.
+ */
+static char *
+inetname(in)
+	struct in_addr in;
+{
+	register char *cp;
+	static char line[50];
+	struct hostent *hp;
+	static char domain[MAXHOSTNAMELEN + 1];
+	static int first = 1;
+
+	if (first && !nflag) {
+		first = 0;
+		if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
+		    (cp = index(domain, '.')))
+			(void) strcpy(domain, cp + 1);
+		else
+			domain[0] = 0;
+	}
+	cp = 0;
+	if (!nflag && in.s_addr != INADDR_ANY) {
+		hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
+		if (hp) {
+			if ((cp = index(hp->h_name, '.')) &&
+			    !strcmp(cp + 1, domain))
+				*cp = 0;
+			cp = (char *)hp->h_name;
+		}
+	}
+	if (cp)
+		(void) strcpy(line, cp);
+	else {
+		in.s_addr = ntohl(in.s_addr);
+#define C(x)    ((x) & 0xff)
+		sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24),
+			C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
+	}
+	return (line);
+}
diff --git a/usage.h b/usage.h
index a19f0fe22..70dafd81c 100644
--- a/usage.h
+++ b/usage.h
@@ -1593,6 +1593,28 @@
 	"$ echo "gdkkn vnqkc" | tr [a-y] [b-z]\n" \
 	"hello world\n" 
 
+#define traceroute_trivial_usage \
+	"[-dnrv] [-m max_ttl] [-p port#] [-q nqueries]\n\
+	[-s src_addr] [-t tos] [-w wait] host [data size]"
+#define traceroute_full_usage \
+	"trace the route ip packets follow going to \"host\"\n" \
+	"Options:\n" \
+	"\t-d\tset SO_DEBUG options to socket\n" \
+	"\t-n\tPrint hop addresses numerically rather than symbolically\n" \
+	"\t-r\tBypass the normal routing tables and send directly to a host\n" \
+	"\t-v\tVerbose output\n" \
+	"\t-m max_ttl\tSet the max time-to-live (max number of hops)\n" \
+	"\t-p port#\tSet the base UDP port number used in probes\n" \
+	"\t\t(default is 33434)\n" \
+	"\t-q nqueries\tSet the number of probes per ``ttl'' to nqueries\n" \
+	"\t\t(default is 3)\n" \
+	"\t-s src_addr\tUse the following IP address as the source address\n" \
+	"\t-t tos\tSet the type-of-service in probe packets to the following value\n" \
+	"\t\t(default 0)\n" \
+	"\t-w wait\tSet the time (in seconds) to wait for a response to a probe\n" \
+	"\t\t(default 3 sec.)."
+
+
 #define true_trivial_usage \
 	""
 #define true_full_usage \