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authorGravatar Eric Andersen <andersen@codepoet.org>2001-07-10 16:29:00 +0000
committerGravatar Eric Andersen <andersen@codepoet.org>2001-07-10 16:29:00 +0000
commit5c58d283bbd71db2a43379fc2b804f6c138cf35e (patch)
tree6dd8028a88bf560831a117cba5f59709237055e9 /networking
parent91b84603d3c3f3911bee87c8ad02c06cb8fc95ae (diff)
downloadbusybox-5c58d283bbd71db2a43379fc2b804f6c138cf35e.tar.gz
busybox-5c58d283bbd71db2a43379fc2b804f6c138cf35e.tar.bz2
A traceroute applet from vodz. This could probably be slimmed down,
but will do for now...
Diffstat (limited to 'networking')
-rw-r--r--networking/traceroute.c593
1 files changed, 593 insertions, 0 deletions
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);
+}