- sync traceroute with Slackware-10.1

  (support -FIl -g gw -i if -z pt now).
- libbb/getopt_ulflags.c support bb_opt_complementally="x-x" as trigger now

1 files changed, 1202 insertions, 344 deletions

diff --git a/networking/traceroute.c b/networking/traceroute.c
index 628b134..15d55e7 100644
--- a/networking/traceroute.c
+++ b/networking/traceroute.c
@@ -1,44 +1,181 @@
-/*-
- * Copyright (c) 1990, 1993
+/*
+ * Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000
  *      The Regents of the University of California.  All rights reserved.
  *
- * This code is derived from software contributed to Berkeley by
- * Van Jacobson.
+ * Busybox port by Vladimir Oleynik (C) 2005 <dzo@simtreas.ru>
  *
- * Special for busybox ported by Vladimir Oleynik <dzo@simtreas.ru> 2001
  * 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. 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.
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
+//#define version "1.4a12"
+
+
 /*
  * traceroute host  - trace the route ip packets follow going to "host".
+ *
+ * Attempt to trace the route an ip packet would follow to some
+ * internet host.  We find out intermediate hops by launching probe
+ * packets with a small ttl (time to live) then listening for an
+ * icmp "time exceeded" reply from a gateway.  We start our probes
+ * with a ttl of one and increase by one until we get an icmp "port
+ * unreachable" (which means we got to "host") or hit a max (which
+ * defaults to 30 hops & can be changed with the -m flag).  Three
+ * probes (change with -q flag) are sent at each ttl setting and a
+ * line is printed showing the ttl, address of the gateway and
+ * round trip time of each probe.  If the probe answers come from
+ * different gateways, the address of each responding system will
+ * be printed.  If there is no response within a 5 sec. timeout
+ * interval (changed with the -w flag), a "*" is printed for that
+ * probe.
+ *
+ * Probe packets are UDP format.  We don't want the destination
+ * host to process them so the destination port is set to an
+ * unlikely value (if some clod on the destination is using that
+ * value, it can be changed with the -p flag).
+ *
+ * A sample use might be:
+ *
+ *     [yak 71]% traceroute nis.nsf.net.
+ *     traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
+ *      1  helios.ee.lbl.gov (128.3.112.1)  19 ms  19 ms  0 ms
+ *      2  lilac-dmc.Berkeley.EDU (128.32.216.1)  39 ms  39 ms  19 ms
+ *      3  lilac-dmc.Berkeley.EDU (128.32.216.1)  39 ms  39 ms  19 ms
+ *      4  ccngw-ner-cc.Berkeley.EDU (128.32.136.23)  39 ms  40 ms  39 ms
+ *      5  ccn-nerif22.Berkeley.EDU (128.32.168.22)  39 ms  39 ms  39 ms
+ *      6  128.32.197.4 (128.32.197.4)  40 ms  59 ms  59 ms
+ *      7  131.119.2.5 (131.119.2.5)  59 ms  59 ms  59 ms
+ *      8  129.140.70.13 (129.140.70.13)  99 ms  99 ms  80 ms
+ *      9  129.140.71.6 (129.140.71.6)  139 ms  239 ms  319 ms
+ *     10  129.140.81.7 (129.140.81.7)  220 ms  199 ms  199 ms
+ *     11  nic.merit.edu (35.1.1.48)  239 ms  239 ms  239 ms
+ *
+ * Note that lines 2 & 3 are the same.  This is due to a buggy
+ * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards
+ * packets with a zero ttl.
+ *
+ * A more interesting example is:
+ *
+ *     [yak 72]% traceroute allspice.lcs.mit.edu.
+ *     traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
+ *      1  helios.ee.lbl.gov (128.3.112.1)  0 ms  0 ms  0 ms
+ *      2  lilac-dmc.Berkeley.EDU (128.32.216.1)  19 ms  19 ms  19 ms
+ *      3  lilac-dmc.Berkeley.EDU (128.32.216.1)  39 ms  19 ms  19 ms
+ *      4  ccngw-ner-cc.Berkeley.EDU (128.32.136.23)  19 ms  39 ms  39 ms
+ *      5  ccn-nerif22.Berkeley.EDU (128.32.168.22)  20 ms  39 ms  39 ms
+ *      6  128.32.197.4 (128.32.197.4)  59 ms  119 ms  39 ms
+ *      7  131.119.2.5 (131.119.2.5)  59 ms  59 ms  39 ms
+ *      8  129.140.70.13 (129.140.70.13)  80 ms  79 ms  99 ms
+ *      9  129.140.71.6 (129.140.71.6)  139 ms  139 ms  159 ms
+ *     10  129.140.81.7 (129.140.81.7)  199 ms  180 ms  300 ms
+ *     11  129.140.72.17 (129.140.72.17)  300 ms  239 ms  239 ms
+ *     12  * * *
+ *     13  128.121.54.72 (128.121.54.72)  259 ms  499 ms  279 ms
+ *     14  * * *
+ *     15  * * *
+ *     16  * * *
+ *     17  * * *
+ *     18  ALLSPICE.LCS.MIT.EDU (18.26.0.115)  339 ms  279 ms  279 ms
+ *
+ * (I start to see why I'm having so much trouble with mail to
+ * MIT.)  Note that the gateways 12, 14, 15, 16 & 17 hops away
+ * either don't send ICMP "time exceeded" messages or send them
+ * with a ttl too small to reach us.  14 - 17 are running the
+ * MIT C Gateway code that doesn't send "time exceeded"s.  God
+ * only knows what's going on with 12.
+ *
+ * The silent gateway 12 in the above may be the result of a bug in
+ * the 4.[23]BSD network code (and its derivatives):  4.x (x <= 3)
+ * sends an unreachable message using whatever ttl remains in the
+ * original datagram.  Since, for gateways, the remaining ttl is
+ * zero, the icmp "time exceeded" is guaranteed to not make it back
+ * to us.  The behavior of this bug is slightly more interesting
+ * when it appears on the destination system:
+ *
+ *      1  helios.ee.lbl.gov (128.3.112.1)  0 ms  0 ms  0 ms
+ *      2  lilac-dmc.Berkeley.EDU (128.32.216.1)  39 ms  19 ms  39 ms
+ *      3  lilac-dmc.Berkeley.EDU (128.32.216.1)  19 ms  39 ms  19 ms
+ *      4  ccngw-ner-cc.Berkeley.EDU (128.32.136.23)  39 ms  40 ms  19 ms
+ *      5  ccn-nerif35.Berkeley.EDU (128.32.168.35)  39 ms  39 ms  39 ms
+ *      6  csgw.Berkeley.EDU (128.32.133.254)  39 ms  59 ms  39 ms
+ *      7  * * *
+ *      8  * * *
+ *      9  * * *
+ *     10  * * *
+ *     11  * * *
+ *     12  * * *
+ *     13  rip.Berkeley.EDU (128.32.131.22)  59 ms !  39 ms !  39 ms !
+ *
+ * Notice that there are 12 "gateways" (13 is the final
+ * destination) and exactly the last half of them are "missing".
+ * What's really happening is that rip (a Sun-3 running Sun OS3.5)
+ * is using the ttl from our arriving datagram as the ttl in its
+ * icmp reply.  So, the reply will time out on the return path
+ * (with no notice sent to anyone since icmp's aren't sent for
+ * icmp's) until we probe with a ttl that's at least twice the path
+ * length.  I.e., rip is really only 7 hops away.  A reply that
+ * returns with a ttl of 1 is a clue this problem exists.
+ * Traceroute prints a "!" after the time if the ttl is <= 1.
+ * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or
+ * non-standard (HPUX) software, expect to see this problem
+ * frequently and/or take care picking the target host of your
+ * probes.
+ *
+ * Other possible annotations after the time are !H, !N, !P (got a host,
+ * network or protocol unreachable, respectively), !S or !F (source
+ * route failed or fragmentation needed -- neither of these should
+ * ever occur and the associated gateway is busted if you see one).  If
+ * almost all the probes result in some kind of unreachable, traceroute
+ * will give up and exit.
+ *
  * 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.)
  *
+ * This program requires a kernel mod that does not appear in any
+ * system available from Berkeley:  A raw ip socket using proto
+ * IPPROTO_RAW must interpret the data sent as an ip datagram (as
+ * opposed to data to be wrapped in a ip datagram).  See the README
+ * file that came with the source to this program for a description
+ * of the mods I made to /sys/netinet/raw_ip.c.  Your mileage may
+ * vary.  But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
+ * MODIFIED TO RUN THIS PROGRAM.
+ *
+ * The udp port usage may appear bizarre (well, ok, it is bizarre).
+ * The problem is that an icmp message only contains 8 bytes of
+ * data from the original datagram.  8 bytes is the size of a udp
+ * header so, if we want to associate replies with the original
+ * datagram, the necessary information must be encoded into the
+ * udp header (the ip id could be used but there's no way to
+ * interlock with the kernel's assignment of ip id's and, anyway,
+ * it would have taken a lot more kernel hacking to allow this
+ * code to set the ip id).  So, to allow two or more users to
+ * use traceroute simultaneously, we use this task's pid as the
+ * source port (the high bit is set to move the port number out
+ * of the "likely" range).  To keep track of which probe is being
+ * replied to (so times and/or hop counts don't get confused by a
+ * reply that was delayed in transit), we increment the destination
+ * port number before each probe.
+ *
+ * Don't use this as a coding example.  I was trying to find a
+ * routing problem and this code sort-of popped out after 48 hours
+ * without sleep.  I was amazed it ever compiled, much less ran.
+ *
  * 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
@@ -54,169 +191,537 @@
  * 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)
+ *  -- Van Jacobson (van@ee.lbl.gov)
  *     Tue Dec 20 03:50:13 PST 1988
  */
 
 #undef CONFIG_FEATURE_TRACEROUTE_VERBOSE
 //#define CONFIG_FEATURE_TRACEROUTE_VERBOSE
 #undef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG   /* not in documentation man */
+#undef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+//#define CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+#undef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
+//#define CONFIG_FEATURE_TRACEROUTE_USE_ICMP
 
-#include <stdio.h>
 #include <errno.h>
+#include <memory.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
-#include <sys/time.h>
-#include "inet_common.h"
+#include <fcntl.h>
+#include <malloc.h>
 #include <netdb.h>
 #include <endian.h>
+#include <getopt.h>
+
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/time.h>                           /* concession to AIX */
+#include <sys/select.h>
+#include "inet_common.h"
+
+#include <net/if.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
 #include <netinet/udp.h>
 #include <netinet/ip.h>
 #include <netinet/ip_icmp.h>
 
+#include "busybox.h"
 
-#define MAXPACKET       65535   /* max ip packet size */
-#ifndef MAXHOSTNAMELEN
-#define MAXHOSTNAMELEN  64
-#endif
 
 /*
- * format of a (udp) probe packet.
+ * Definitions for internet protocol version 4.
+ * Per RFC 791, September 1981.
  */
-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 */
+#define IPVERSION       4
+
+/*
+ * Overlay for ip header used by other protocols (tcp, udp).
+ */
+struct ipovly {
+	u_char  ih_x1[9];               /* (unused) */
+	u_char  ih_pr;                  /* protocol */
+	short   ih_len;                 /* protocol length */
+	struct  in_addr ih_src;         /* source internet address */
+	struct  in_addr ih_dst;         /* destination internet address */
 };
 
 /*
- * Definitions for internet protocol version 4.
- * Per RFC 791, September 1981.
+ * UDP kernel structures and variables.
  */
-#define IPVERSION       4
+struct  udpiphdr {
+	struct  ipovly ui_i;            /* overlaid ip structure */
+	struct  udphdr ui_u;            /* udp header */
+};
+#define ui_next         ui_i.ih_next
+#define ui_prev         ui_i.ih_prev
+#define ui_x1           ui_i.ih_x1
+#define ui_pr           ui_i.ih_pr
+#define ui_len          ui_i.ih_len
+#define ui_src          ui_i.ih_src
+#define ui_dst          ui_i.ih_dst
+#define ui_sport        ui_u.uh_sport
+#define ui_dport        ui_u.uh_dport
+#define ui_ulen         ui_u.uh_ulen
+#define ui_sum          ui_u.uh_sum
 
 
-#include "busybox.h"
+/* Host name and address list */
+struct hostinfo {
+	char *name;
+	int n;
+	u_int32_t *addrs;
+};
+
+/* Data section of the probe packet */
+struct outdata {
+	u_char seq;             /* sequence number of this packet */
+	u_char ttl;             /* ttl packet left with */
+	struct timeval tv __attribute__((packed)); /* time packet left */
+};
+
+struct IFADDRLIST {
+	u_int32_t addr;
+	char device[sizeof(struct ifreq)];
+};
+
+
+static const char route[] = "/proc/net/route";
 
-                                       /* last inbound (icmp) packet */
-static u_char  packet[512] __attribute__ ((aligned));
-static struct opacket  *outpacket;     /* last output (udp) packet */
+/* last inbound (icmp) packet */
+static u_char  packet[512] __attribute__((align (32)));
+
+static struct ip *outip;               /* last output (udp) packet */
+static struct udphdr *outudp;          /* last output (udp) packet */
+static struct outdata *outdata;        /* last output (udp) packet */
+
+#ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
+static struct icmp *outicmp;           /* last output (icmp) packet */
+#endif
+
+#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+/* Maximum number of gateways (include room for one noop) */
+#define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(u_int32_t)))
+/* loose source route gateway list (including room for final destination) */
+static u_int32_t gwlist[NGATEWAYS + 1];
+#endif
 
 static int s;                          /* receive (icmp) socket file descriptor */
-static int sndsock;                    /* send (udp) socket file descriptor */
+static int sndsock;                    /* send (udp/icmp) socket file descriptor */
 
-static struct sockaddr whereto;        /* Who to try to reach */
-static int datalen;                    /* How much data */
+static struct sockaddr_storage whereto;        /* Who to try to reach */
+static struct sockaddr_storage wherefrom;      /* Who we are */
+static int packlen;                    /* total length of packet */
+static int minpacket;                  /* min ip packet size */
+static int maxpacket = 32 * 1024;      /* max ip packet size */
+static int pmtu;                       /* Path MTU Discovery (RFC1191) */
 
 static char *hostname;
+static const char devnull[] = "/dev/null";
 
-static int max_ttl = 30;
 static u_short ident;
-static u_short port = 32768+666;       /* start udp dest port # for probe packets */
+static u_short port = 32768 + 666;     /* start udp dest port # for probe packets */
 
+static int waittime = 5;               /* time to wait for response (in seconds) */
+static int nflag;                      /* print addresses numerically */
+static int doipcksum = 1;              /* calculate ip checksums by default */
+
+#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+static int optlen;                     /* length of ip options */
+#else
+#define optlen 0
+#endif
+
+#ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
+static int useicmp;                    /* use icmp echo instead of udp packets */
+#endif
 #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
 static int verbose;
 #endif
-static int waittime = 5;               /* time to wait for response (in seconds) */
-static int nflag;                      /* print addresses numerically */
 
 /*
- * Construct an Internet address representation.
- * If the nflag has been supplied, give
- * numeric value, otherwise try for symbolic name.
+ * Return the interface list
  */
-static inline void
-inetname(struct sockaddr_in *from)
+static int
+ifaddrlist(struct IFADDRLIST **ipaddrp)
 {
-	char *cp;
-	static char domain[MAXHOSTNAMELEN + 1];
-	char name[MAXHOSTNAMELEN + 1];
-	static int first = 1;
-	const char *ina;
+	int fd, nipaddr;
+#ifdef HAVE_SOCKADDR_SA_LEN
+	int n;
+#endif
+	struct ifreq *ifrp, *ifend, *ifnext;
+	struct sockaddr_in *addr_sin;
+	struct IFADDRLIST *al;
+	struct ifconf ifc;
+	struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr;
+	struct IFADDRLIST *st_ifaddrlist;
 
-	if (first && !nflag) {
-		first = 0;
-		if (getdomainname(domain, MAXHOSTNAMELEN) != 0)
-			domain[0] = 0;
+	fd = socket(AF_INET, SOCK_DGRAM, 0);
+	if (fd < 0)
+		bb_perror_msg_and_die("socket");
+
+	ifc.ifc_len = sizeof(ibuf);
+	ifc.ifc_buf = (caddr_t)ibuf;
+
+	if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
+	    ifc.ifc_len < sizeof(struct ifreq)) {
+		if (errno == EINVAL)
+			bb_error_msg_and_die(
+			    "SIOCGIFCONF: ifreq struct too small (%d bytes)",
+			    sizeof(ibuf));
+		else
+			bb_perror_msg_and_die("SIOCGIFCONF");
 	}
-	cp = 0;
-	if (!nflag && from->sin_addr.s_addr != INADDR_ANY) {
-		if(INET_rresolve(name, sizeof(name), from, 0x4000, 0xffffffff) >= 0) {
-			if ((cp = strchr(name, '.')) &&
-			    !strcmp(cp + 1, domain))
-				*cp = 0;
-			cp = (char *)name;
+	ifrp = ibuf;
+	ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
+
+	nipaddr = 1 + (ifc.ifc_len / sizeof(struct ifreq));
+	st_ifaddrlist = xcalloc(nipaddr, sizeof(struct IFADDRLIST));
+	al = st_ifaddrlist;
+	nipaddr = 0;
+
+	for (; ifrp < ifend; ifrp = ifnext) {
+#ifdef HAVE_SOCKADDR_SA_LEN
+		n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
+		if (n < sizeof(*ifrp))
+			ifnext = ifrp + 1;
+		else
+			ifnext = (struct ifreq *)((char *)ifrp + n);
+		if (ifrp->ifr_addr.sa_family != AF_INET)
+			continue;
+#else
+		ifnext = ifrp + 1;
+#endif
+		/*
+		 * Need a template to preserve address info that is
+		 * used below to locate the next entry.  (Otherwise,
+		 * SIOCGIFFLAGS stomps over it because the requests
+		 * are returned in a union.)
+		 */
+		strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
+		if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
+			if (errno == ENXIO)
+				continue;
+			bb_perror_msg_and_die("SIOCGIFFLAGS: %.*s",
+			    (int)sizeof(ifr.ifr_name), ifr.ifr_name);
 		}
+
+		/* Must be up */
+		if ((ifr.ifr_flags & IFF_UP) == 0)
+			continue;
+
+		safe_strncpy(al->device, ifr.ifr_name, sizeof(ifr.ifr_name) + 1);
+#ifdef sun
+		/* Ignore sun virtual interfaces */
+		if (strchr(al->device, ':') != NULL)
+			continue;
+#endif
+		if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0)
+			bb_perror_msg_and_die("SIOCGIFADDR: %s", al->device);
+
+		addr_sin = (struct sockaddr_in *)&ifr.ifr_addr;
+		al->addr = addr_sin->sin_addr.s_addr;
+		++al;
+		++nipaddr;
 	}
-	ina = inet_ntoa(from->sin_addr);
-	if (nflag)
-		printf(" %s", ina);
-	else
-		printf(" %s (%s)", (cp ? cp : ina), ina);
+	if(nipaddr == 0)
+	    bb_error_msg_and_die ("Can't find any network interfaces");
+	(void)close(fd);
+
+	*ipaddrp = st_ifaddrlist;
+	return nipaddr;
 }
 
-static inline void
-print(u_char *buf, int cc, struct sockaddr_in *from)
+
+static void
+setsin(struct sockaddr_in *addr_sin, u_int32_t addr)
 {
-	struct ip *ip;
-	int hlen;
+	memset(addr_sin, 0, sizeof(*addr_sin));
+#ifdef HAVE_SOCKADDR_SA_LEN
+	addr_sin->sin_len = sizeof(*addr_sin);
+#endif
+	addr_sin->sin_family = AF_INET;
+	addr_sin->sin_addr.s_addr = addr;
+}
 
-	ip = (struct ip *) buf;
-	hlen = ip->ip_hl << 2;
-	cc -= hlen;
 
-	inetname(from);
-#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
-	if (verbose)
-		printf (" %d bytes to %s", cc, inet_ntoa (ip->ip_dst));
-#endif
+/*
+ * Return the source address for the given destination address
+ */
+static void
+findsaddr(const struct sockaddr_in *to, struct sockaddr_in *from)
+{
+	int i, n;
+	FILE *f;
+	u_int32_t mask;
+	u_int32_t dest, tmask;
+	struct IFADDRLIST *al;
+	char buf[256], tdevice[256], device[256];
+
+	f = bb_xfopen(route, "r");
+
+	/* Find the appropriate interface */
+	n = 0;
+	mask = 0;
+	device[0] = '\0';
+	while (fgets(buf, sizeof(buf), f) != NULL) {
+		++n;
+		if (n == 1 && strncmp(buf, "Iface", 5) == 0)
+			continue;
+		if ((i = sscanf(buf, "%255s %x %*s %*s %*s %*s %*s %x",
+		    tdevice, &dest, &tmask)) != 3)
+			bb_error_msg_and_die ("junk in buffer");
+		if ((to->sin_addr.s_addr & tmask) == dest &&
+		    (tmask > mask || mask == 0)) {
+			mask = tmask;
+			strcpy(device, tdevice);
+		}
+	}
+	fclose(f);
+
+	if (device[0] == '\0')
+		bb_error_msg_and_die ("Can't find interface");
+
+	/* Get the interface address list */
+	n = ifaddrlist(&al);
+
+	/* Find our appropriate source address */
+	for (i = n; i > 0; --i, ++al)
+		if (strcmp(device, al->device) == 0)
+			break;
+	if (i <= 0)
+		bb_error_msg_and_die("Can't find interface %s", device);
+
+	setsin(from, al->addr);
 }
 
-static inline double
-deltaT(struct timeval *t1p, struct timeval *t2p)
+/*
+"Usage: %s [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]\n"
+"\t[-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]\n"
+"\t[-w waittime] [-z pausemsecs] host [packetlen]"
+
+*/
+
+/* String to value with optional min and max. Handles decimal and hex. */
+static int
+str2val(const char *str, const char *what, int mi, int ma)
 {
-	double dt;
+	const char *cp;
+	int val;
+	char *ep;
 
-	dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
-	     (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
-	return (dt);
+	if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) {
+		cp = str + 2;
+		val = (int)strtol(cp, &ep, 16);
+	} else
+		val = (int)strtol(str, &ep, 10);
+	if (*ep != '\0') {
+		bb_error_msg_and_die("\"%s\" bad value for %s \n", str, what);
+	}
+	if (val < mi && mi >= 0) {
+		if (mi == 0)
+			bb_error_msg_and_die("%s must be >= %d\n", what, mi);
+		else
+			bb_error_msg_and_die("%s must be > %d\n", what, mi - 1);
+	}
+	if (val > ma && ma >= 0)
+		bb_error_msg_and_die("%s must be <= %d\n", what, ma);
+	return val;
 }
 
-static inline int
-wait_for_reply(int sock, struct sockaddr_in *from, int reset_timer)
+
+/*
+ * Subtract 2 timeval structs:  out = out - in.
+ * Out is assumed to be >= in.
+ */
+static inline void
+tvsub(struct timeval *out, struct timeval *in)
+{
+
+	if ((out->tv_usec -= in->tv_usec) < 0)   {
+		--out->tv_sec;
+		out->tv_usec += 1000000;
+	}
+	out->tv_sec -= in->tv_sec;
+}
+
+static int
+wait_for_reply(int sock, struct sockaddr_in *fromp, const struct timeval *tp)
 {
 	fd_set fds;
-	static struct timeval wait;
+	struct timeval now, wait;
+	struct timezone tz;
 	int cc = 0;
-	int fromlen = sizeof (*from);
+	socklen_t fromlen = sizeof(*fromp);
 
 	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;
+
+	wait.tv_sec = tp->tv_sec + waittime;
+	wait.tv_usec = tp->tv_usec;
+	(void)gettimeofday(&now, &tz);
+	tvsub(&wait, &now);
+
+	if (select(sock + 1, &fds, NULL, NULL, &wait) > 0)
+		cc = recvfrom(sock, (char *)packet, sizeof(packet), 0,
+			    (struct sockaddr *)fromp, &fromlen);
+
+	return cc;
+}
+
+/*
+ * Checksum routine for Internet Protocol family headers (C Version)
+ */
+static u_short
+in_cksum(u_short *addr, int len)
+{
+	int nleft = len;
+	u_short *w = addr;
+	u_short answer;
+	int sum = 0;
+
+	/*
+	 *  Our algorithm is simple, using a 32 bit accumulator (sum),
+	 *  we add sequential 16 bit words to it, and at the end, fold
+	 *  back all the carry bits from the top 16 bits into the lower
+	 *  16 bits.
+	 */
+	while (nleft > 1)  {
+		sum += *w++;
+		nleft -= 2;
+	}
+
+	/* mop up an odd byte, if necessary */
+	if (nleft == 1)
+		sum += *(u_char *)w;
+
+	/*
+	 * add back carry outs from top 16 bits to low 16 bits
+	 */
+	sum = (sum >> 16) + (sum & 0xffff);     /* add hi 16 to low 16 */
+	sum += (sum >> 16);                     /* add carry */
+	answer = ~sum;                          /* truncate to 16 bits */
+	return answer;
+}
+
+
+static void
+send_probe(int seq, int ttl, struct timeval *tp)
+{
+	int cc;
+	struct udpiphdr *ui, *oui;
+	struct ip tip;
+
+	outip->ip_ttl = ttl;
+	outip->ip_id = htons(ident + seq);
+
+	/*
+	 * In most cases, the kernel will recalculate the ip checksum.
+	 * But we must do it anyway so that the udp checksum comes out
+	 * right.
+	 */
+	if (doipcksum) {
+		outip->ip_sum =
+		    in_cksum((u_short *)outip, sizeof(*outip) + optlen);
+		if (outip->ip_sum == 0)
+			outip->ip_sum = 0xffff;
+	}
+
+	/* Payload */
+	outdata->seq = seq;
+	outdata->ttl = ttl;
+	memcpy(&outdata->tv, tp, sizeof(outdata->tv));
+
+#ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
+	if (useicmp)
+		outicmp->icmp_seq = htons(seq);
+	else
+#endif
+		outudp->dest = htons(port + seq);
+
+#ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
+	if (useicmp) {
+		/* Always calculate checksum for icmp packets */
+		outicmp->icmp_cksum = 0;
+		outicmp->icmp_cksum = in_cksum((u_short *)outicmp,
+		    packlen - (sizeof(*outip) + optlen));
+		if (outicmp->icmp_cksum == 0)
+			outicmp->icmp_cksum = 0xffff;
+	} else
+#endif
+	       if (doipcksum) {
+		/* Checksum (we must save and restore ip header) */
+		tip = *outip;
+		ui = (struct udpiphdr *)outip;
+		oui = (struct udpiphdr *)&tip;
+		/* Easier to zero and put back things that are ok */
+		memset((char *)ui, 0, sizeof(ui->ui_i));
+		ui->ui_src = oui->ui_src;
+		ui->ui_dst = oui->ui_dst;
+		ui->ui_pr = oui->ui_pr;
+		ui->ui_len = outudp->len;
+		outudp->check = 0;
+		outudp->check = in_cksum((u_short *)ui, packlen);
+		if (outudp->check == 0)
+			outudp->check = 0xffff;
+		*outip = tip;
+	}
+
+#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
+	/* XXX undocumented debugging hack */
+	if (verbose > 1) {
+		const u_short *sp;
+		int nshorts, i;
+
+		sp = (u_short *)outip;
+		nshorts = (u_int)packlen / sizeof(u_short);
+		i = 0;
+		printf("[ %d bytes", packlen);
+		while (--nshorts >= 0) {
+			if ((i++ % 8) == 0)
+				printf("\n\t");
+			printf(" %04x", ntohs(*sp));
+			sp++;
+		}
+		if (packlen & 1) {
+			if ((i % 8) == 0)
+				printf("\n\t");
+			printf(" %02x", *(u_char *)sp);
+		}
+		printf("]\n");
+	}
+#endif
+
+#if !defined(IP_HDRINCL) && defined(IP_TTL)
+	if (setsockopt(sndsock, IPPROTO_IP, IP_TTL,
+	    (char *)&ttl, sizeof(ttl)) < 0) {
+		bb_perror_msg_and_die("setsockopt ttl %d", ttl);
+	}
+#endif
+
+	cc = sendto(sndsock, (char *)outip,
+	    packlen, 0, (struct sockaddr *)&whereto, sizeof(whereto));
+	if (cc < 0 || cc != packlen)  {
+		if (cc < 0)
+			bb_perror_msg_and_die("sendto");
+		printf("%s: wrote %s %d chars, ret=%d\n",
+		    bb_applet_name, hostname, packlen, cc);
+		(void)fflush(stdout);
 	}
+}
 
-	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);
+static inline double
+deltaT(struct timeval *t1p, struct timeval *t2p)
+{
+	double dt;
 
-	return(cc);
+	dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
+	     (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
+	return dt;
 }
 
 #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
@@ -229,19 +734,19 @@ pr_type(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",
+	"Echo",         "Router Advert", "Router Solicit", "Time Exceeded",
 	"Param Problem", "Timestamp",   "Timestamp Reply", "Info Request",
-	"Info Reply"
+	"Info Reply",   "Mask Request", "Mask Reply"
 	};
 
-	if(t > 16)
-		return("OUT-OF-RANGE");
+	if (t > 18)
+		return "OUT-OF-RANGE";
 
-	return(ttab[t]);
+	return ttab[t];
 }
 #endif
 
-static inline int
+static int
 packet_ok(u_char *buf, int cc, struct sockaddr_in *from, int seq)
 {
 	struct icmp *icp;
@@ -257,293 +762,646 @@ packet_ok(u_char *buf, int cc, struct sockaddr_in *from, int seq)
 			printf("packet too short (%d bytes) from %s\n", cc,
 				inet_ntoa(from->sin_addr));
 #endif
-		return (0);
+		return 0;
 	}
 	cc -= hlen;
 	icp = (struct icmp *)(buf + hlen);
-	type = icp->icmp_type; code = icp->icmp_code;
+	type = icp->icmp_type;
+	code = icp->icmp_code;
+	/* Path MTU Discovery (RFC1191) */
+	if (code != ICMP_UNREACH_NEEDFRAG)
+		pmtu = 0;
+	else {
+		pmtu = ntohs(icp->icmp_nextmtu);
+	}
 	if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) ||
-	    type == ICMP_UNREACH) {
+	    type == ICMP_UNREACH || type == ICMP_ECHOREPLY) {
 		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);
+#ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
+		if (useicmp) {
+			struct icmp *hicmp;
+
+			/* XXX */
+			if (type == ICMP_ECHOREPLY &&
+			    icp->icmp_id == htons(ident) &&
+			    icp->icmp_seq == htons(seq))
+				return -2;
+
+			hicmp = (struct icmp *)((u_char *)hip + hlen);
+			/* XXX 8 is a magic number */
+			if (hlen + 8 <= cc &&
+			    hip->ip_p == IPPROTO_ICMP &&
+			    hicmp->icmp_id == htons(ident) &&
+			    hicmp->icmp_seq == htons(seq))
+				return (type == ICMP_TIMXCEED ? -1 : code + 1);
+		} else
+#endif
+		      {
+			up = (struct udphdr *)((u_char *)hip + hlen);
+			/* XXX 8 is a magic number */
+			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);
+		}
 	}
 #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
 	if (verbose) {
 		int i;
-		u_long *lp = (u_long *)&icp->icmp_ip;
+		u_int32_t *lp = (u_int32_t *)&icp->icmp_ip;
 
-		printf("\n%d bytes from %s to %s: icmp type %d (%s) code %d\n",
-			cc, inet_ntoa(from->sin_addr), inet_ntoa(ip->ip_dst),
-			type, pr_type(type), icp->icmp_code);
-		for (i = 4; i < cc ; i += sizeof(long))
-			printf("%2d: x%8.8lx\n", i, *lp++);
+		printf("\n%d bytes from %s to "
+		       "%s: icmp type %d (%s) code %d\n",
+		    cc, inet_ntoa(from->sin_addr),
+		    inet_ntoa(ip->ip_dst), type, pr_type(type), icp->icmp_code);
+		for (i = 4; i < cc ; i += sizeof(*lp))
+			printf("%2d: x%8.8x\n", i, *lp++);
 	}
 #endif
-	return(0);
+	return 0;
 }
 
-static void             /* not inline */
-send_probe(int seq, int ttl)
+
+/*
+ * Construct an Internet address representation.
+ * If the nflag has been supplied, give
+ * numeric value, otherwise try for symbolic name.
+ */
+static inline void
+inetname(struct sockaddr_in *from)
 {
-	struct opacket *op = outpacket;
-	struct ip *ip = &op->ip;
-	struct udphdr *up = &op->udp;
-	int i;
-	struct timezone tz;
+	const char *n = NULL;
+	const char *ina;
+	char name[257];
 
-	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);
+	if (!nflag && from->sin_addr.s_addr != INADDR_ANY) {
+		if(INET_rresolve(name, sizeof(name), from, 0x4000, 0xffffffff) >= 0)
+			n = name;
 	}
+	ina = inet_ntoa(from->sin_addr);
+	if (nflag)
+		printf(" %s", ina);
+	else
+		printf(" %s (%s)", (n ? n : ina), ina);
 }
 
+static inline void
+print(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;
 
-int
-#ifndef CONFIG_TRACEROUTE
-main(int argc, char *argv[])
-#else
-traceroute_main(int argc, char *argv[])
+	inetname(from);
+#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
+	if (verbose)
+		printf(" %d bytes to %s", cc, inet_ntoa (ip->ip_dst));
 #endif
+}
+
+
+static struct hostinfo *
+gethostinfo(const char *host)
 {
-	extern char *optarg;
-	extern int optind;
+	int n;
 	struct hostent *hp;
-	struct sockaddr_in from, *to;
-	int ch, i, on, probe, seq, tos, ttl;
+	struct hostinfo *hi;
+	char **p;
+	u_int32_t addr, *ap;
+
+	hi = xcalloc(1, sizeof(*hi));
+	addr = inet_addr(host);
+	if ((int32_t)addr != -1) {
+		hi->name = bb_xstrdup(host);
+		hi->n = 1;
+		hi->addrs = xcalloc(1, sizeof(hi->addrs[0]));
+		hi->addrs[0] = addr;
+		return hi;
+	}
+
+	hp = xgethostbyname(host);
+	if (hp->h_addrtype != AF_INET || hp->h_length != 4)
+		bb_perror_msg_and_die("bad host %s", host);
+	hi->name = bb_xstrdup(hp->h_name);
+	for (n = 0, p = hp->h_addr_list; *p != NULL; ++n, ++p)
+		continue;
+	hi->n = n;
+	hi->addrs = xcalloc(n, sizeof(hi->addrs[0]));
+	for (ap = hi->addrs, p = hp->h_addr_list; *p != NULL; ++ap, ++p)
+		memcpy(ap, *p, sizeof(*ap));
+	return hi;
+}
+
+static void
+freehostinfo(struct hostinfo *hi)
+{
+	if (hi->name != NULL) {
+		free(hi->name);
+		hi->name = NULL;
+	}
+	free((char *)hi->addrs);
+	free((char *)hi);
+}
+
+#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+static void
+getaddr(u_int32_t *ap, const char *host)
+{
+	struct hostinfo *hi;
+
+	hi = gethostinfo(host);
+	*ap = hi->addrs[0];
+	freehostinfo(hi);
+}
+#endif
+
 
-	int options = 0;                /* socket options */
-	char *source = 0;
+int
+traceroute_main(int argc, char *argv[])
+{
+	int code, n;
+	char *cp;
+	u_char *outp;
+	u_int32_t *ap;
+	struct sockaddr_in *from = (struct sockaddr_in *)&wherefrom;
+	struct sockaddr_in *to = (struct sockaddr_in *)&whereto;
+	struct hostinfo *hi;
+	int on = 1;
+	struct protoent *pe;
+	int ttl, probe, i;
+	int seq = 0;
+	int tos = 0;
+	char *tos_str = NULL;
+	char *source = NULL;
+	unsigned long op;
+
+#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+	int lsrr = 0;
+#endif
+	u_short off = 0;
+	struct IFADDRLIST *al;
+	int uid = getuid();
+	char *device = NULL;
+	int max_ttl = 30;
+	char *max_ttl_str = NULL;
+	char *port_str = NULL;
 	int nprobes = 3;
+	char *nprobes_str = NULL;
+	char *waittime_str = NULL;
+	u_int pausemsecs = 0;
+	char *pausemsecs_str = NULL;
+	int first_ttl = 1;
+	char *first_ttl_str = NULL;
+#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+	llist_t *sourse_route_list = NULL;
+#endif
 
-	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':
-#ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG
-			options |= SO_DEBUG;
+	opterr = 0;
+#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+	bb_opt_complementally = "x-x:g*";
+#else
+	bb_opt_complementally = "x-x";
 #endif
-			break;
-		case 'm':
-			max_ttl = atoi(optarg);
-			if (max_ttl <= 1)
-				bb_error_msg_and_die("max ttl must be >1.");
-			break;
-		case 'n':
-			nflag++;
-			break;
-		case 'p':
-			port = atoi(optarg);
-			if (port < 1)
-				bb_error_msg_and_die("port must be >0.");
-			break;
-		case 'q':
-			nprobes = atoi(optarg);
-			if (nprobes < 1)
-				bb_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)
-				bb_error_msg_and_die("tos must be 0 to 255.");
-			break;
-		case 'v':
+
+	op = bb_getopt_ulflags(argc, argv, "FIlnrdvxt:i:m:p:q:s:w:z:f:"
+#define USAGE_OP_DONT_FRAGMNT (1<<0)    /* F  */
+#define USAGE_OP_USE_ICMP     (1<<1)    /* I  */
+#define USAGE_OP_TTL_FLAG     (1<<2)    /* l  */
+#define USAGE_OP_ADDR_NUM     (1<<3)    /* n  */
+#define USAGE_OP_BYPASS_ROUTE (1<<4)    /* r  */
+#define USAGE_OP_DEBUG        (1<<5)    /* d */
+#define USAGE_OP_VERBOSE      (1<<6)    /* v */
+#define USAGE_OP_IP_CHKSUM    (1<<7)    /* x */
+
+#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+					"g:"
+#endif
+	, &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str,
+	&source, &waittime_str, &pausemsecs_str, &first_ttl_str
+#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+	, &sourse_route_list
+#endif
+	);
+
+	if(op & USAGE_OP_DONT_FRAGMNT)
+		off = IP_DF;
+#ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
+	useicmp = op & USAGE_OP_USE_ICMP;
+#endif
+	nflag = op & USAGE_OP_ADDR_NUM;
 #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
-			verbose++;
+	verbose = op &  USAGE_OP_VERBOSE;
 #endif
-			break;
-		case 'w':
-			waittime = atoi(optarg);
-			if (waittime <= 1)
-				bb_error_msg_and_die("wait must be >1 sec.");
-			break;
-		default:
-			bb_show_usage();
+	if(op & USAGE_OP_IP_CHKSUM) {
+		doipcksum = 0;
+		bb_error_msg("Warning: ip checksums disabled");
+	}
+	if (tos_str)
+		tos = str2val(tos_str, "tos", 0, 255);
+	if(max_ttl_str)
+		max_ttl = str2val(max_ttl_str, "max ttl", 1, 255);
+	if(port_str)
+		port = (u_short)str2val(port_str, "port", 1, (1 << 16) - 1);
+	if(nprobes_str)
+		nprobes = str2val(optarg, "nprobes", 1, -1);
+	if(source) {
+	    /*
+	     * set the ip source address of the outbound
+	     * probe (e.g., on a multi-homed host).
+	     */
+	     if (uid)
+		bb_error_msg_and_die("-s %s: Permission denied", source);
+	}
+	if(waittime_str)
+		waittime = str2val(waittime_str, "wait time", 2, 24 * 60 * 60);
+	if(pausemsecs_str)
+		pausemsecs = str2val(pausemsecs_str, "pause msecs", 0, 60 * 60 * 1000);
+	if(first_ttl_str)
+		first_ttl = str2val(first_ttl_str, "first ttl", 1, 255);
+
+#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+	if(sourse_route_list) {
+		llist_t *l_sr;
+
+		for(l_sr = sourse_route_list; l_sr; ) {
+			if (lsrr >= NGATEWAYS)
+				bb_error_msg_and_die("No more than %d gateways", NGATEWAYS);
+			getaddr(gwlist + lsrr, l_sr->data);
+			++lsrr;
+			l_sr = l_sr->link;
+			free(sourse_route_list);
+			sourse_route_list = l_sr;
 		}
-	argc -= optind;
-	argv += optind;
+		optlen = (lsrr + 1) * sizeof(gwlist[0]);
+	}
+#endif
+
+	if (first_ttl > max_ttl) {
+		bb_error_msg_and_die(
+		    "first ttl (%d) may not be greater than max ttl (%d)",
+		    first_ttl, max_ttl);
+	}
+
+	minpacket = sizeof(*outip) + sizeof(*outdata) + optlen;
+
+#ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
+	if (useicmp)
+		minpacket += 8;                 /* XXX magic number */
+	else
+#endif
+		minpacket += sizeof(*outudp);
+	packlen = minpacket;                    /* minimum sized packet */
+
+	/* Process destination and optional packet size */
+	switch (argc - optind) {
+
+	case 2:
+		packlen = str2val(argv[optind + 1],
+		    "packet length", minpacket, maxpacket);
+		/* Fall through */
 
-	if (argc < 1)
+	case 1:
+		hostname = argv[optind];
+		hi = gethostinfo(hostname);
+		setsin(to, hi->addrs[0]);
+		if (hi->n > 1)
+			bb_error_msg(
+		    "Warning: %s has multiple addresses; using %s",
+				hostname, inet_ntoa(to->sin_addr));
+		hostname = hi->name;
+		hi->name = NULL;
+		freehostinfo(hi);
+		break;
+
+	default:
 		bb_show_usage();
+	}
 
-	setlinebuf (stdout);
-
-	memset(&whereto, 0, sizeof(struct sockaddr));
-	hp = xgethostbyname(*argv);
-			to->sin_family = hp->h_addrtype;
-	memcpy(&to->sin_addr, hp->h_addr, hp->h_length);
-			hostname = (char *)hp->h_name;
-	if (*++argv)
-		datalen = atoi(*argv);
-	if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket))
-		bb_error_msg_and_die("packet size must be 0 <= s < %d.",
-		    (int)(MAXPACKET - sizeof(struct opacket)));
-	datalen += sizeof(struct opacket);
-	outpacket = (struct opacket *)xmalloc((unsigned)datalen);
-	memset(outpacket, 0, datalen);
-	outpacket->ip.ip_dst = to->sin_addr;
-	outpacket->ip.ip_tos = tos;
-	outpacket->ip.ip_v = IPVERSION;
-	outpacket->ip.ip_id = 0;
+	cp = "icmp";
+	if ((pe = getprotobyname(cp)) == NULL)
+		bb_perror_msg_and_die("unknown protocol %s", cp);
 
-	ident = (getpid() & 0xffff) | 0x8000;
+	/* Insure the socket fds won't be 0, 1 or 2 */
+	do n = bb_xopen(devnull, O_RDONLY); while (n < 2);
+	if (n > 2)
+		close(n);
 
-	if ((sndsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
+	if ((s = socket(AF_INET, SOCK_RAW, pe->p_proto)) < 0)
 		bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
 
-	s = create_icmp_socket();
-
 #ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG
-	if (options & SO_DEBUG)
-		(void) setsockopt(s, SOL_SOCKET, SO_DEBUG,
-				  (char *)&on, sizeof(on));
+	if (op & USAGE_OP_DEBUG)
+		(void)setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&on,
+		    sizeof(on));
 #endif
-	if (options & SO_DONTROUTE)
-		(void) setsockopt(s, SOL_SOCKET, SO_DONTROUTE,
-				  (char *)&on, sizeof(on));
+	if (op & USAGE_OP_BYPASS_ROUTE)
+		(void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, (char *)&on,
+		    sizeof(on));
+
+	sndsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
+	if (sndsock < 0)
+		bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
+
+#ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+#if defined(IP_OPTIONS)
+	if (lsrr > 0) {
+		u_char optlist[MAX_IPOPTLEN];
+
+		cp = "ip";
+		if ((pe = getprotobyname(cp)) == NULL)
+			bb_perror_msg_and_die("unknown protocol");
+
+		/* final hop */
+		gwlist[lsrr] = to->sin_addr.s_addr;
+		++lsrr;
+
+		/* force 4 byte alignment */
+		optlist[0] = IPOPT_NOP;
+		/* loose source route option */
+		optlist[1] = IPOPT_LSRR;
+		i = lsrr * sizeof(gwlist[0]);
+		optlist[2] = i + 3;
+		/* Pointer to LSRR addresses */
+		optlist[3] = IPOPT_MINOFF;
+		memcpy(optlist + 4, gwlist, i);
+
+		if ((setsockopt(sndsock, pe->p_proto, IP_OPTIONS,
+		    (char *)optlist, i + sizeof(gwlist[0]))) < 0) {
+			bb_perror_msg_and_die("IP_OPTIONS");
+		    }
+	}
+#endif /* IP_OPTIONS */
+#endif /* CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE */
+
 #ifdef SO_SNDBUF
-	if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen,
-		       sizeof(datalen)) < 0)
+	if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&packlen,
+	    sizeof(packlen)) < 0) {
 		bb_perror_msg_and_die("SO_SNDBUF");
+	}
 #endif
 #ifdef IP_HDRINCL
 	if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, (char *)&on,
-		       sizeof(on)) < 0)
+	    sizeof(on)) < 0 && errno != ENOPROTOOPT) {
 		bb_perror_msg_and_die("IP_HDRINCL");
+	}
+#else
+#ifdef IP_TOS
+	if (tos_str && setsockopt(sndsock, IPPROTO_IP, IP_TOS,
+	    (char *)&tos, sizeof(tos)) < 0) {
+		bb_perror_msg_and_die("setsockopt tos %d", tos);
+	}
+#endif
 #endif
 #ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG
-	if (options & SO_DEBUG)
-		(void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
-				  (char *)&on, sizeof(on));
-#endif
-	if (options & SO_DONTROUTE)
-		(void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
-				  (char *)&on, sizeof(on));
-
-	if (source) {
-		memset(&from, 0, sizeof(struct sockaddr));
-		from.sin_family = AF_INET;
-		from.sin_addr.s_addr = inet_addr(source);
-		if (from.sin_addr.s_addr == -1)
-			bb_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)
-			bb_perror_msg_and_die("bind");
+	if (op & USAGE_OP_DEBUG)
+		(void)setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, (char *)&on,
+		    sizeof(on));
+#endif
+	if (op & USAGE_OP_BYPASS_ROUTE)
+		(void)setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, (char *)&on,
+		    sizeof(on));
+
+	/* Revert to non-privileged user after opening sockets */
+	setgid(getgid());
+	setuid(uid);
+
+	outip = (struct ip *)xcalloc(1, (unsigned)packlen);
+
+	outip->ip_v = IPVERSION;
+	if (tos_str)
+		outip->ip_tos = tos;
+	outip->ip_len = htons(packlen);
+	outip->ip_off = htons(off);
+	outp = (u_char *)(outip + 1);
+	outip->ip_dst = to->sin_addr;
+
+	outip->ip_hl = (outp - (u_char *)outip) >> 2;
+	ident = (getpid() & 0xffff) | 0x8000;
+#ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
+	if (useicmp) {
+		outip->ip_p = IPPROTO_ICMP;
+
+		outicmp = (struct icmp *)outp;
+		outicmp->icmp_type = ICMP_ECHO;
+		outicmp->icmp_id = htons(ident);
+
+		outdata = (struct outdata *)(outp + 8); /* XXX magic number */
+	} else
 #endif
+	       {
+		outip->ip_p = IPPROTO_UDP;
+
+		outudp = (struct udphdr *)outp;
+		outudp->source = htons(ident);
+		outudp->len =
+		    htons((u_short)(packlen - (sizeof(*outip) + optlen)));
+		outdata = (struct outdata *)(outudp + 1);
 	}
 
-	fprintf(stderr, "traceroute to %s (%s)", hostname,
-		inet_ntoa(to->sin_addr));
+	/* Get the interface address list */
+	n = ifaddrlist(&al);
+
+	/* Look for a specific device */
+	if (device != NULL) {
+		for (i = n; i > 0; --i, ++al)
+			if (strcmp(device, al->device) == 0)
+				break;
+		if (i <= 0) {
+			bb_error_msg_and_die("Can't find interface %s", device);
+		}
+	}
+
+	/* Determine our source address */
+	if (source == NULL) {
+		/*
+		 * If a device was specified, use the interface address.
+		 * Otherwise, try to determine our source address.
+		 */
+		if (device != NULL)
+			setsin(from, al->addr);
+		findsaddr(to, from);
+	} else {
+		hi = gethostinfo(source);
+		source = hi->name;
+		hi->name = NULL;
+		/*
+		 * If the device was specified make sure it
+		 * corresponds to the source address specified.
+		 * Otherwise, use the first address (and warn if
+		 * there are more than one).
+		 */
+		if (device != NULL) {
+			for (i = hi->n, ap = hi->addrs; i > 0; --i, ++ap)
+				if (*ap == al->addr)
+					break;
+			if (i <= 0) {
+				bb_error_msg_and_die(
+				    "%s is not on interface %s",
+				    source, device);
+			}
+			setsin(from, *ap);
+		} else {
+			setsin(from, hi->addrs[0]);
+			if (hi->n > 1)
+				bb_error_msg(
+			"Warning: %s has multiple addresses; using %s",
+				    source, inet_ntoa(from->sin_addr));
+		}
+		freehostinfo(hi);
+	}
+
+	outip->ip_src = from->sin_addr;
+#ifndef IP_HDRINCL
+	if (bind(sndsock, (struct sockaddr *)from, sizeof(*from)) < 0) {
+		bb_perror_msg_and_die("bind");
+	}
+#endif
+
+	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);
+	fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, packlen);
+	(void)fflush(stderr);
 
-	for (ttl = 1; ttl <= max_ttl; ++ttl) {
-		u_long lastaddr = 0;
+	for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
+		u_int32_t lastaddr = 0;
+		int gotlastaddr = 0;
 		int got_there = 0;
 		int unreachable = 0;
+		int sentfirst = 0;
 
 		printf("%2d ", ttl);
 		for (probe = 0; probe < nprobes; ++probe) {
-			int cc, reset_timer;
+			int cc;
 			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:
-						ip = (struct ip *)packet;
-						if (ip->ip_ttl <= 1)
-							printf(" !");
-						++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;
-					}
+			if (sentfirst && pausemsecs > 0)
+				usleep(pausemsecs * 1000);
+			(void)gettimeofday(&t1, &tz);
+			send_probe(++seq, ttl, &t1);
+			++sentfirst;
+			while ((cc = wait_for_reply(s, from, &t1)) != 0) {
+				(void)gettimeofday(&t2, &tz);
+				i = packet_ok(packet, cc, from, seq);
+				/* Skip short packet */
+				if (i == 0)
+					continue;
+				if (!gotlastaddr ||
+				    from->sin_addr.s_addr != lastaddr) {
+					print(packet, cc, from);
+					lastaddr = from->sin_addr.s_addr;
+					++gotlastaddr;
+				}
+				printf("  %.3f ms", deltaT(&t1, &t2));
+				ip = (struct ip *)packet;
+				if (op & USAGE_OP_TTL_FLAG)
+					printf(" (%d)", ip->ip_ttl);
+				if (i == -2) {
+					if (ip->ip_ttl <= 1)
+						printf(" !");
+					++got_there;
+					break;
+				}
+				/* time exceeded in transit */
+				if (i == -1)
+					break;
+				code = i - 1;
+				switch (code) {
+
+				case ICMP_UNREACH_PORT:
+					if (ip->ip_ttl <= 1)
+						printf(" !");
+					++got_there;
+					break;
+
+				case ICMP_UNREACH_NET:
+					++unreachable;
+					printf(" !N");
 					break;
-				} else
-					reset_timer = 0;
+
+				case ICMP_UNREACH_HOST:
+					++unreachable;
+					printf(" !H");
+					break;
+
+				case ICMP_UNREACH_PROTOCOL:
+					++got_there;
+					printf(" !P");
+					break;
+
+				case ICMP_UNREACH_NEEDFRAG:
+					++unreachable;
+					printf(" !F-%d", pmtu);
+					break;
+
+				case ICMP_UNREACH_SRCFAIL:
+					++unreachable;
+					printf(" !S");
+					break;
+
+				case ICMP_UNREACH_FILTER_PROHIB:
+				case ICMP_UNREACH_NET_PROHIB:   /* misuse */
+					++unreachable;
+					printf(" !A");
+					break;
+
+				case ICMP_UNREACH_HOST_PROHIB:
+					++unreachable;
+					printf(" !C");
+					break;
+
+				case ICMP_UNREACH_HOST_PRECEDENCE:
+					++unreachable;
+					printf(" !V");
+					break;
+
+				case ICMP_UNREACH_PRECEDENCE_CUTOFF:
+					++unreachable;
+					printf(" !C");
+					break;
+
+				case ICMP_UNREACH_NET_UNKNOWN:
+				case ICMP_UNREACH_HOST_UNKNOWN:
+					++unreachable;
+					printf(" !U");
+					break;
+
+				case ICMP_UNREACH_ISOLATED:
+					++unreachable;
+					printf(" !I");
+					break;
+
+				case ICMP_UNREACH_TOSNET:
+				case ICMP_UNREACH_TOSHOST:
+					++unreachable;
+					printf(" !T");
+					break;
+
+				default:
+					++unreachable;
+					printf(" !<%d>", code);
+					break;
+				}
+				break;
 			}
 			if (cc == 0)
 				printf(" *");
-			(void) fflush(stdout);
+			(void)fflush(stdout);
 		}
 		putchar('\n');
-		if (got_there || unreachable >= nprobes-1)
-			return 0;
+		if (got_there ||
+		    (unreachable > 0 && unreachable >= nprobes - 1))
+			break;
 	}
-
 	return 0;
 }