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549 lines
15 KiB
C
549 lines
15 KiB
C
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Van Jacobson.
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*
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* Special for busybox ported by Vladimir Oleynik <dzo@simtreas.ru> 2001
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* traceroute host - trace the route ip packets follow going to "host".
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* Notes
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* -----
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* This program must be run by root or be setuid. (I suggest that
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* you *don't* make it setuid -- casual use could result in a lot
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* of unnecessary traffic on our poor, congested nets.)
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*
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* I stole the idea for this program from Steve Deering. Since
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* the first release, I've learned that had I attended the right
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* IETF working group meetings, I also could have stolen it from Guy
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* Almes or Matt Mathis. I don't know (or care) who came up with
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* the idea first. I envy the originators' perspicacity and I'm
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* glad they didn't keep the idea a secret.
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*
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* Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
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* enhancements to the original distribution.
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*
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* I've hacked up a round-trip-route version of this that works by
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* sending a loose-source-routed udp datagram through the destination
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* back to yourself. Unfortunately, SO many gateways botch source
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* routing, the thing is almost worthless. Maybe one day...
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*
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* -- Van Jacobson (van@helios.ee.lbl.gov)
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* Tue Dec 20 03:50:13 PST 1988
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*/
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#undef CONFIG_FEATURE_TRACEROUTE_VERBOSE
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//#define CONFIG_FEATURE_TRACEROUTE_VERBOSE
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#undef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG /* not in documentation man */
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include "inet_common.h"
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#include <netdb.h>
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#include <endian.h>
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#include <netinet/udp.h>
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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#define MAXPACKET 65535 /* max ip packet size */
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#ifndef MAXHOSTNAMELEN
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#define MAXHOSTNAMELEN 64
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#endif
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/*
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* format of a (udp) probe packet.
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*/
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struct opacket {
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struct ip ip;
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struct udphdr udp;
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u_char seq; /* sequence number of this packet */
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u_char ttl; /* ttl packet left with */
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struct timeval tv; /* time packet left */
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};
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/*
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* Definitions for internet protocol version 4.
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* Per RFC 791, September 1981.
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*/
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#define IPVERSION 4
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#include "busybox.h"
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static u_char packet[512]; /* last inbound (icmp) packet */
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static struct opacket *outpacket; /* last output (udp) packet */
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static int s; /* receive (icmp) socket file descriptor */
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static int sndsock; /* send (udp) socket file descriptor */
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static struct sockaddr whereto; /* Who to try to reach */
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static int datalen; /* How much data */
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static char *hostname;
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static int max_ttl = 30;
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static u_short ident;
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static u_short port = 32768+666; /* start udp dest port # for probe packets */
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#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
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static int verbose;
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#endif
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static int waittime = 5; /* time to wait for response (in seconds) */
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static int nflag; /* print addresses numerically */
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/*
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* Construct an Internet address representation.
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* If the nflag has been supplied, give
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* numeric value, otherwise try for symbolic name.
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*/
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static inline void
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inetname(struct sockaddr_in *from)
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{
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char *cp;
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static char domain[MAXHOSTNAMELEN + 1];
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char name[MAXHOSTNAMELEN + 1];
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static int first = 1;
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const char *ina;
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if (first && !nflag) {
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first = 0;
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if (getdomainname(domain, MAXHOSTNAMELEN) != 0)
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domain[0] = 0;
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}
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cp = 0;
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if (!nflag && from->sin_addr.s_addr != INADDR_ANY) {
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if(INET_rresolve(name, sizeof(name), from, 0x4000, 0xffffffff) >= 0) {
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if ((cp = strchr(name, '.')) &&
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!strcmp(cp + 1, domain))
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*cp = 0;
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cp = (char *)name;
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}
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}
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ina = inet_ntoa(from->sin_addr);
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if (nflag)
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printf(" %s", ina);
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else
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printf(" %s (%s)", (cp ? cp : ina), ina);
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}
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static inline void
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print(u_char *buf, int cc, struct sockaddr_in *from)
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{
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struct ip *ip;
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int hlen;
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ip = (struct ip *) buf;
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hlen = ip->ip_hl << 2;
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cc -= hlen;
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inetname(from);
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#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
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if (verbose)
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printf (" %d bytes to %s", cc, inet_ntoa (ip->ip_dst));
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#endif
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}
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static inline double
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deltaT(struct timeval *t1p, struct timeval *t2p)
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{
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double dt;
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dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
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(double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
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return (dt);
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}
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static inline int
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wait_for_reply(int sock, struct sockaddr_in *from, int reset_timer)
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{
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fd_set fds;
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static struct timeval wait;
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int cc = 0;
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int fromlen = sizeof (*from);
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FD_ZERO(&fds);
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FD_SET(sock, &fds);
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if (reset_timer) {
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/*
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* traceroute could hang if someone else has a ping
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* running and our ICMP reply gets dropped but we don't
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* realize it because we keep waking up to handle those
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* other ICMP packets that keep coming in. To fix this,
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* "reset_timer" will only be true if the last packet that
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* came in was for us or if this is the first time we're
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* waiting for a reply since sending out a probe. Note
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* that this takes advantage of the select() feature on
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* Linux where the remaining timeout is written to the
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* struct timeval area.
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*/
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wait.tv_sec = waittime;
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wait.tv_usec = 0;
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}
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if (select(sock+1, &fds, (fd_set *)0, (fd_set *)0, &wait) > 0)
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cc=recvfrom(s, (char *)packet, sizeof(packet), 0,
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(struct sockaddr *)from, &fromlen);
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return(cc);
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}
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#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
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/*
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* Convert an ICMP "type" field to a printable string.
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*/
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static inline const char *
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pr_type(u_char t)
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{
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static const char * const ttab[] = {
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"Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable",
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"Source Quench", "Redirect", "ICMP 6", "ICMP 7",
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"Echo", "ICMP 9", "ICMP 10", "Time Exceeded",
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"Param Problem", "Timestamp", "Timestamp Reply", "Info Request",
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"Info Reply"
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};
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if(t > 16)
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return("OUT-OF-RANGE");
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return(ttab[t]);
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}
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#endif
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static inline int
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packet_ok(u_char *buf, int cc, struct sockaddr_in *from, int seq)
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{
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struct icmp *icp;
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u_char type, code;
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int hlen;
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struct ip *ip;
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ip = (struct ip *) buf;
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hlen = ip->ip_hl << 2;
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if (cc < hlen + ICMP_MINLEN) {
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#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
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if (verbose)
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printf("packet too short (%d bytes) from %s\n", cc,
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inet_ntoa(from->sin_addr));
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#endif
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return (0);
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}
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cc -= hlen;
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icp = (struct icmp *)(buf + hlen);
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type = icp->icmp_type; code = icp->icmp_code;
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if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) ||
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type == ICMP_UNREACH) {
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struct ip *hip;
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struct udphdr *up;
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hip = &icp->icmp_ip;
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hlen = hip->ip_hl << 2;
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up = (struct udphdr *)((u_char *)hip + hlen);
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if (hlen + 12 <= cc && hip->ip_p == IPPROTO_UDP &&
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up->source == htons(ident) &&
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up->dest == htons(port+seq))
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return (type == ICMP_TIMXCEED? -1 : code+1);
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}
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#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
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if (verbose) {
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int i;
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u_long *lp = (u_long *)&icp->icmp_ip;
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printf("\n%d bytes from %s to %s: icmp type %d (%s) code %d\n",
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cc, inet_ntoa(from->sin_addr), inet_ntoa(ip->ip_dst),
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type, pr_type(type), icp->icmp_code);
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for (i = 4; i < cc ; i += sizeof(long))
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printf("%2d: x%8.8lx\n", i, *lp++);
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}
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#endif
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return(0);
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}
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static void /* not inline */
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send_probe(int seq, int ttl)
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{
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struct opacket *op = outpacket;
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struct ip *ip = &op->ip;
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struct udphdr *up = &op->udp;
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int i;
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struct timezone tz;
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ip->ip_off = 0;
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ip->ip_hl = sizeof(*ip) >> 2;
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ip->ip_p = IPPROTO_UDP;
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ip->ip_len = datalen;
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ip->ip_ttl = ttl;
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ip->ip_v = IPVERSION;
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ip->ip_id = htons(ident+seq);
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up->source = htons(ident);
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up->dest = htons(port+seq);
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up->len = htons((u_short)(datalen - sizeof(struct ip)));
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up->check = 0;
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op->seq = seq;
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op->ttl = ttl;
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(void) gettimeofday(&op->tv, &tz);
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i = sendto(sndsock, (char *)outpacket, datalen, 0, &whereto,
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sizeof(struct sockaddr));
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if (i < 0 || i != datalen) {
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if (i<0)
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perror("sendto");
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printf("traceroute: wrote %s %d chars, ret=%d\n", hostname,
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datalen, i);
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(void) fflush(stdout);
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}
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}
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int
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#ifndef CONFIG_TRACEROUTE
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main(int argc, char *argv[])
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#else
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traceroute_main(int argc, char *argv[])
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#endif
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{
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extern char *optarg;
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extern int optind;
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struct hostent *hp;
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struct sockaddr_in from, *to;
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int ch, i, on, probe, seq, tos, ttl;
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int options = 0; /* socket options */
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char *source = 0;
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int nprobes = 3;
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on = 1;
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seq = tos = 0;
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to = (struct sockaddr_in *)&whereto;
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while ((ch = getopt(argc, argv, "dm:np:q:rs:t:w:v")) != EOF)
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switch(ch) {
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case 'd':
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#ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG
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options |= SO_DEBUG;
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#endif
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break;
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case 'm':
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max_ttl = atoi(optarg);
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if (max_ttl <= 1)
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bb_error_msg_and_die("max ttl must be >1.");
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break;
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case 'n':
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nflag++;
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break;
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case 'p':
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port = atoi(optarg);
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if (port < 1)
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bb_error_msg_and_die("port must be >0.");
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break;
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case 'q':
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nprobes = atoi(optarg);
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if (nprobes < 1)
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bb_error_msg_and_die("nprobes must be >0.");
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break;
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case 'r':
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options |= SO_DONTROUTE;
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break;
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case 's':
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/*
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* set the ip source address of the outbound
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* probe (e.g., on a multi-homed host).
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*/
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source = optarg;
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break;
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case 't':
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tos = atoi(optarg);
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if (tos < 0 || tos > 255)
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bb_error_msg_and_die("tos must be 0 to 255.");
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break;
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case 'v':
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#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
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verbose++;
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#endif
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break;
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case 'w':
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waittime = atoi(optarg);
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if (waittime <= 1)
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bb_error_msg_and_die("wait must be >1 sec.");
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break;
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default:
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bb_show_usage();
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}
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argc -= optind;
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argv += optind;
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if (argc < 1)
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bb_show_usage();
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setlinebuf (stdout);
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memset(&whereto, 0, sizeof(struct sockaddr));
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hp = xgethostbyname(*argv);
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to->sin_family = hp->h_addrtype;
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memcpy(&to->sin_addr, hp->h_addr, hp->h_length);
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hostname = (char *)hp->h_name;
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if (*++argv)
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datalen = atoi(*argv);
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if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket))
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bb_error_msg_and_die("packet size must be 0 <= s < %d.",
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MAXPACKET - sizeof(struct opacket));
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datalen += sizeof(struct opacket);
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outpacket = (struct opacket *)xmalloc((unsigned)datalen);
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memset(outpacket, 0, datalen);
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outpacket->ip.ip_dst = to->sin_addr;
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outpacket->ip.ip_tos = tos;
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outpacket->ip.ip_v = IPVERSION;
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outpacket->ip.ip_id = 0;
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ident = (getpid() & 0xffff) | 0x8000;
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if ((sndsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
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bb_perror_msg_and_die(bb_msg_can_not_create_raw_socket);
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s = create_icmp_socket();
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#ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG
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if (options & SO_DEBUG)
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(void) setsockopt(s, SOL_SOCKET, SO_DEBUG,
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(char *)&on, sizeof(on));
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#endif
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if (options & SO_DONTROUTE)
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(void) setsockopt(s, SOL_SOCKET, SO_DONTROUTE,
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(char *)&on, sizeof(on));
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#ifdef SO_SNDBUF
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if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen,
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sizeof(datalen)) < 0)
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bb_perror_msg_and_die("SO_SNDBUF");
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#endif
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#ifdef IP_HDRINCL
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if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, (char *)&on,
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sizeof(on)) < 0)
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bb_perror_msg_and_die("IP_HDRINCL");
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#endif
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#ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG
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if (options & SO_DEBUG)
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(void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
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(char *)&on, sizeof(on));
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#endif
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if (options & SO_DONTROUTE)
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(void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
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(char *)&on, sizeof(on));
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if (source) {
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memset(&from, 0, sizeof(struct sockaddr));
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from.sin_family = AF_INET;
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from.sin_addr.s_addr = inet_addr(source);
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if (from.sin_addr.s_addr == -1)
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bb_error_msg_and_die("unknown host %s", source);
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outpacket->ip.ip_src = from.sin_addr;
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#ifndef IP_HDRINCL
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if (bind(sndsock, (struct sockaddr *)&from, sizeof(from)) < 0)
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bb_perror_msg_and_die("bind");
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#endif
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}
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fprintf(stderr, "traceroute to %s (%s)", hostname,
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inet_ntoa(to->sin_addr));
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if (source)
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fprintf(stderr, " from %s", source);
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fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, datalen);
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for (ttl = 1; ttl <= max_ttl; ++ttl) {
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u_long lastaddr = 0;
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int got_there = 0;
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int unreachable = 0;
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printf("%2d ", ttl);
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for (probe = 0; probe < nprobes; ++probe) {
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int cc, reset_timer;
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struct timeval t1, t2;
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struct timezone tz;
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struct ip *ip;
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(void) gettimeofday(&t1, &tz);
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send_probe(++seq, ttl);
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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;
|
|
}
|
|
break;
|
|
} else
|
|
reset_timer = 0;
|
|
}
|
|
if (cc == 0)
|
|
printf(" *");
|
|
(void) fflush(stdout);
|
|
}
|
|
putchar('\n');
|
|
if (got_there || unreachable >= nprobes-1)
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|