-/*-
- * Copyright (c) 1990, 1993
+/* vi: set sw=4 ts=4: */
+/*
+ * 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.
*/
/*
* 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
* 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 TRACEROUTE_SO_DEBUG 0
+
+/* TODO: undefs were uncommented - ??! we have config system for that! */
+/* probably ok to remove altogether */
+//#undef CONFIG_FEATURE_TRACEROUTE_VERBOSE
//#define CONFIG_FEATURE_TRACEROUTE_VERBOSE
-#undef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG /* not in documentation man */
-
-#include <stdio.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/time.h>
-#include "inet_common.h"
-#include <netdb.h>
-#include <endian.h>
+//#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 <net/if.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
#include <netinet/udp.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
-
- /* It turns out that libc5 doesn't have proper icmp support
- * built into it header files, so we have to supplement it */
-#if __GNU_LIBRARY__ < 5
-static const int ICMP_MINLEN = 8; /* abs minimum */
+#include "libbb.h"
+#include "inet_common.h"
-struct icmp_ra_addr
-{
- u_int32_t ira_addr;
- u_int32_t ira_preference;
+#ifndef IPPROTO_ICMP
+# define IPPROTO_ICMP 1
+#endif
+#ifndef IPPROTO_IP
+# define IPPROTO_IP 0
+#endif
+
+/* Keep in sync with getopt32 call! */
+enum {
+ OPT_DONT_FRAGMNT = (1 << 0), /* F */
+ OPT_USE_ICMP = (1 << 1) * ENABLE_FEATURE_TRACEROUTE_USE_ICMP, /* I */
+ OPT_TTL_FLAG = (1 << 2), /* l */
+ OPT_ADDR_NUM = (1 << 3), /* n */
+ OPT_BYPASS_ROUTE = (1 << 4), /* r */
+ OPT_DEBUG = (1 << 5), /* d */
+ OPT_VERBOSE = (1 << 6) * ENABLE_FEATURE_TRACEROUTE_VERBOSE, /* v */
+ OPT_IP_CHKSUM = (1 << 7), /* x */
+ OPT_TOS = (1 << 8), /* t */
+ OPT_DEVICE = (1 << 9), /* i */
+ OPT_MAX_TTL = (1 << 10), /* m */
+ OPT_PORT = (1 << 11), /* p */
+ OPT_NPROBES = (1 << 12), /* q */
+ OPT_SOURCE = (1 << 13), /* s */
+ OPT_WAITTIME = (1 << 14), /* w */
+ OPT_PAUSE_MS = (1 << 15), /* z */
+ OPT_FIRST_TTL = (1 << 16), /* f */
};
+#define verbose (option_mask32 & OPT_VERBOSE)
+enum {
+ SIZEOF_ICMP_HDR = 8,
+ rcvsock = 3, /* receive (icmp) socket file descriptor */
+ sndsock = 4, /* send (udp/icmp) socket file descriptor */
+};
-struct icmp
-{
- u_int8_t icmp_type; /* type of message, see below */
- u_int8_t icmp_code; /* type sub code */
- u_int16_t icmp_cksum; /* ones complement checksum of struct */
- union
- {
- u_char ih_pptr; /* ICMP_PARAMPROB */
- struct in_addr ih_gwaddr; /* gateway address */
- struct ih_idseq /* echo datagram */
- {
- u_int16_t icd_id;
- u_int16_t icd_seq;
- } ih_idseq;
- u_int32_t ih_void;
-
- /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
- struct ih_pmtu
- {
- u_int16_t ipm_void;
- u_int16_t ipm_nextmtu;
- } ih_pmtu;
-
- struct ih_rtradv
- {
- u_int8_t irt_num_addrs;
- u_int8_t irt_wpa;
- u_int16_t irt_lifetime;
- } ih_rtradv;
- } icmp_hun;
-#define icmp_pptr icmp_hun.ih_pptr
-#define icmp_gwaddr icmp_hun.ih_gwaddr
-#define icmp_id icmp_hun.ih_idseq.icd_id
-#define icmp_seq icmp_hun.ih_idseq.icd_seq
-#define icmp_void icmp_hun.ih_void
-#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
-#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
-#define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs
-#define icmp_wpa icmp_hun.ih_rtradv.irt_wpa
-#define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime
- union
- {
- struct
- {
- u_int32_t its_otime;
- u_int32_t its_rtime;
- u_int32_t its_ttime;
- } id_ts;
- struct
- {
- struct ip idi_ip;
- /* options and then 64 bits of data */
- } id_ip;
- struct icmp_ra_addr id_radv;
- u_int32_t id_mask;
- u_int8_t id_data[1];
- } icmp_dun;
-#define icmp_otime icmp_dun.id_ts.its_otime
-#define icmp_rtime icmp_dun.id_ts.its_rtime
-#define icmp_ttime icmp_dun.id_ts.its_ttime
-#define icmp_ip icmp_dun.id_ip.idi_ip
-#define icmp_radv icmp_dun.id_radv
-#define icmp_mask icmp_dun.id_mask
-#define icmp_data icmp_dun.id_data
+/* Data section of the probe packet */
+struct outdata_t {
+ unsigned char seq; /* sequence number of this packet */
+ unsigned char ttl; /* ttl packet left with */
+// UNUSED. Retaining to have the same packet size.
+ struct timeval tv_UNUSED PACKED; /* time packet left */
};
-#define ICMP_MINLEN 8 /* abs minimum */
-#define ICMP_UNREACH 3 /* dest unreachable, codes: */
-#define ICMP_TIMXCEED 11 /* time exceeded, code: */
-#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
-#define ICMP_UNREACH_NET 0 /* bad net */
-#define ICMP_UNREACH_HOST 1 /* bad host */
-#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
-#define ICMP_UNREACH_PORT 3 /* bad port */
-#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
-#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
+struct globals {
+ struct ip *outip;
+ struct outdata_t *outdata;
+ len_and_sockaddr *dest_lsa;
+ int packlen; /* total length of packet */
+ int pmtu; /* Path MTU Discovery (RFC1191) */
+ uint16_t ident;
+ uint16_t port; // 32768 + 666; /* start udp dest port # for probe packets */
+ int waittime; // 5; /* time to wait for response (in seconds) */
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+ int optlen; /* length of ip options */
+#else
+#define optlen 0
#endif
-
-
-#define MAXPACKET 65535 /* max ip packet size */
-#ifndef MAXHOSTNAMELEN
-#define MAXHOSTNAMELEN 64
+ unsigned char recv_pkt[512]; /* last inbound (icmp) packet */
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+ /* Maximum number of gateways (include room for one noop) */
+#define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(uint32_t)))
+ /* loose source route gateway list (including room for final destination) */
+ uint32_t gwlist[NGATEWAYS + 1];
#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 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 */
+#define G (*ptr_to_globals)
+#define outip (G.outip )
+#define outdata (G.outdata )
+#define dest_lsa (G.dest_lsa )
+#define packlen (G.packlen )
+#define pmtu (G.pmtu )
+#define ident (G.ident )
+#define port (G.port )
+#define waittime (G.waittime )
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+# define optlen (G.optlen )
+#endif
+#define recv_pkt (G.recv_pkt )
+#define gwlist (G.gwlist )
+#define INIT_G() do { \
+ SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
+ port = 32768 + 666; \
+ waittime = 5; \
+} while (0)
-static char *hostname;
+#define outicmp ((struct icmp *)(outip + 1))
+#define outudp ((struct udphdr *)(outip + 1))
-static int max_ttl = 30;
-static u_short ident;
-static u_short port = 32768+666; /* start udp dest port # for probe packets */
-#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 */
+static int
+wait_for_reply(struct sockaddr_in *fromp)
+{
+ struct pollfd pfd[1];
+ int cc = 0;
+ socklen_t fromlen = sizeof(*fromp);
+
+ pfd[0].fd = rcvsock;
+ pfd[0].events = POLLIN;
+ if (safe_poll(pfd, 1, waittime * 1000) > 0)
+ cc = recvfrom(rcvsock, recv_pkt, sizeof(recv_pkt), 0,
+ (struct sockaddr *)fromp, &fromlen);
+ return cc;
+}
/*
- * Construct an Internet address representation.
- * If the nflag has been supplied, give
- * numeric value, otherwise try for symbolic name.
+ * Checksum routine for Internet Protocol family headers (C Version)
*/
-static inline void
-inetname(struct sockaddr_in *from)
+static uint16_t
+in_cksum(uint16_t *addr, int len)
{
- char *cp;
- static char domain[MAXHOSTNAMELEN + 1];
- char name[MAXHOSTNAMELEN + 1];
- static int first = 1;
- const char *ina;
-
- if (first && !nflag) {
- first = 0;
- if (getdomainname(domain, MAXHOSTNAMELEN) != 0)
- domain[0] = 0;
- }
- 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;
- }
+ int nleft = len;
+ uint16_t *w = addr;
+ uint16_t 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;
}
- ina = inet_ntoa(from->sin_addr);
- if (nflag)
- printf(" %s", ina);
- else
- printf(" %s (%s)", (cp ? cp : 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;
-
- inetname(from);
-#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
- if (verbose)
- printf (" %d bytes to %s", cc, inet_ntoa (ip->ip_dst));
-#endif
-}
-static inline double
-deltaT(struct timeval *t1p, struct timeval *t2p)
-{
- double dt;
+ /* mop up an odd byte, if necessary */
+ if (nleft == 1)
+ sum += *(unsigned char *)w;
- dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
- (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
- return (dt);
+ /* 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 inline int
-wait_for_reply(int sock, struct sockaddr_in *from, int reset_timer)
+static void
+send_probe(int seq, int ttl)
{
- fd_set fds;
- static struct timeval wait;
- int cc = 0;
- int fromlen = sizeof (*from);
+ int len, res;
+ void *out;
+
+ /* Payload */
+ outdata->seq = seq;
+ outdata->ttl = ttl;
+// UNUSED: was storing gettimeofday's result there, but never ever checked it
+ /*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/
+
+ if (option_mask32 & OPT_USE_ICMP) {
+ outicmp->icmp_seq = htons(seq);
+
+ /* Always calculate checksum for icmp packets */
+ outicmp->icmp_cksum = 0;
+ outicmp->icmp_cksum = in_cksum((uint16_t *)outicmp,
+ packlen - (sizeof(*outip) + optlen));
+ if (outicmp->icmp_cksum == 0)
+ outicmp->icmp_cksum = 0xffff;
+ }
- 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;
+//BUG! verbose is (x & OPT_VERBOSE), not a counter!
+#if 0 //ENABLE_FEATURE_TRACEROUTE_VERBOSE
+ /* XXX undocumented debugging hack */
+ if (verbose > 1) {
+ const uint16_t *sp;
+ int nshorts, i;
+
+ sp = (uint16_t *)outip;
+ nshorts = (unsigned)packlen / sizeof(uint16_t);
+ 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", *(unsigned char *)sp);
+ }
+ printf("]\n");
}
+#endif
- 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);
+#if 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
- return(cc);
+ len = packlen - sizeof(*outip);
+ if (option_mask32 & OPT_USE_ICMP)
+ out = outicmp;
+ else {
+ out = outdata;
+ len -= sizeof(*outudp);
+ set_nport(dest_lsa, htons(port + seq));
+ }
+ res = xsendto(sndsock, out, len,
+ (struct sockaddr *)&dest_lsa->u.sa, dest_lsa->len);
+ if (res != len) {
+ bb_info_msg("sent %d octets, ret=%d", len, res);
+ }
}
-#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
+#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
/*
* Convert an ICMP "type" field to a printable string.
*/
static inline const char *
-pr_type(u_char t)
+pr_type(unsigned char t)
{
- static const char * const ttab[] = {
+ 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 >= ARRAY_SIZE(ttab))
+ return "OUT-OF-RANGE";
- return(ttab[t]);
+ return ttab[t];
}
#endif
-static inline int
-packet_ok(u_char *buf, int cc, struct sockaddr_in *from, int seq)
+#if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
+#define packet_ok(cc, from, seq) \
+ packet_ok(cc, seq)
+#endif
+static int
+packet_ok(int cc, const struct sockaddr_in *from, int seq)
{
- struct icmp *icp;
- u_char type, code;
+ const struct icmp *icp;
+ unsigned char type, code;
int hlen;
- struct ip *ip;
+ const struct ip *ip;
- ip = (struct ip *) buf;
+ ip = (struct ip *) recv_pkt;
hlen = ip->ip_hl << 2;
if (cc < hlen + ICMP_MINLEN) {
-#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
+#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
if (verbose)
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;
- if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) ||
- type == ICMP_UNREACH) {
- struct ip *hip;
- struct udphdr *up;
+ icp = (struct icmp *)(recv_pkt + hlen);
+ type = icp->icmp_type;
+ code = icp->icmp_code;
+ /* Path MTU Discovery (RFC1191) */
+ pmtu = 0;
+ if (code == ICMP_UNREACH_NEEDFRAG)
+ pmtu = ntohs(icp->icmp_nextmtu);
+
+ if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS)
+ || type == ICMP_UNREACH
+ || type == ICMP_ECHOREPLY
+ ) {
+ const struct ip *hip;
+ const 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);
+ if (option_mask32 & OPT_USE_ICMP) {
+ struct icmp *hicmp;
+
+ /* XXX */
+ if (type == ICMP_ECHOREPLY
+ && icp->icmp_id == htons(ident)
+ && icp->icmp_seq == htons(seq)
+ ) {
+ return -2;
+ }
+
+ hicmp = (struct icmp *)((unsigned char *)hip + hlen);
+ if (hlen + SIZEOF_ICMP_HDR <= cc
+ && hip->ip_p == IPPROTO_ICMP
+ && hicmp->icmp_id == htons(ident)
+ && hicmp->icmp_seq == htons(seq)
+ ) {
+ return (type == ICMP_TIMXCEED ? -1 : code + 1);
+ }
+ } else {
+ up = (struct udphdr *)((char *)hip + hlen);
+ if (hlen + 12 <= cc
+ && hip->ip_p == IPPROTO_UDP
+// Off: since we do not form the entire IP packet,
+// but defer it to kernel, we can't set source port,
+// and thus can't check it here in the reply
+ /* && up->source == htons(ident) */
+ && up->dest == htons(port + seq)
+ ) {
+ return (type == ICMP_TIMXCEED ? -1 : code + 1);
+ }
+ }
}
-#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
+#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
if (verbose) {
int i;
- u_long *lp = (u_long *)&icp->icmp_ip;
+ uint32_t *lp = (uint32_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),
+ 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++);
+ 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 -n flag has been supplied, give
+ * numeric value, otherwise try for symbolic name.
+ */
+static void
+print_inetname(const struct sockaddr_in *from)
{
- 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);
+ const char *ina;
+
+ ina = inet_ntoa(from->sin_addr);
+ if (option_mask32 & OPT_ADDR_NUM)
+ printf(" %s", ina);
+ else {
+ char *n = NULL;
+ if (from->sin_addr.s_addr != INADDR_ANY)
+ n = xmalloc_sockaddr2host_noport((struct sockaddr*)from);
+ printf(" %s (%s)", (n ? n : ina), ina);
+ free(n);
}
}
+static void
+print(int cc, const struct sockaddr_in *from)
+{
+ print_inetname(from);
+ if (verbose) {
+ const struct ip *ip;
+ int hlen;
+
+ ip = (struct ip *) recv_pkt;
+ hlen = ip->ip_hl << 2;
+ cc -= hlen;
+ printf(" %d bytes to %s", cc, inet_ntoa(ip->ip_dst));
+ }
+}
-int
-#ifndef CONFIG_TRACEROUTE
-main(int argc, char *argv[])
-#else
-traceroute_main(int argc, char *argv[])
-#endif
+static void
+print_delta_ms(unsigned t1p, unsigned t2p)
{
- extern char *optarg;
- extern int optind;
- struct hostent *hp;
- struct sockaddr_in from, *to;
- int ch, i, on, probe, seq, tos, ttl;
-
- int options = 0; /* socket options */
- char *source = 0;
+ unsigned tt = t2p - t1p;
+ printf(" %u.%03u ms", tt / 1000, tt % 1000);
+}
+
+/*
+Usage: [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]
+[-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]
+[-w waittime] [-z pausemsecs] host [packetlen]"
+*/
+
+int traceroute_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int traceroute_main(int argc, char **argv)
+{
+ int minpacket;
+ int ttl, i;
+ int seq = 0;
+ int tos = 0;
+ int max_ttl = 30;
int nprobes = 3;
+ int first_ttl = 1;
+ unsigned pausemsecs = 0;
+ unsigned op;
+ char *source;
+ char *device;
+ char *tos_str;
+ char *max_ttl_str;
+ char *port_str;
+ char *nprobes_str;
+ char *waittime_str;
+ char *pausemsecs_str;
+ char *first_ttl_str;
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+ llist_t *source_route_list = NULL;
+ int lsrr = 0;
+#endif
+
+ INIT_G();
- 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;
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+ opt_complementary = "x-x:g::";
+#else
+ opt_complementary = "x-x";
#endif
- 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':
-#ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
- verbose++;
+
+ op = getopt32(argv, "FIlnrdvxt:i:m:p:q:s:w:z:f:"
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+ "g:"
#endif
- break;
- case 'w':
- waittime = atoi(optarg);
- if (waittime <= 1)
- error_msg_and_die("wait must be >1 sec.");
- break;
- default:
- show_usage();
+ , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str
+ , &source, &waittime_str, &pausemsecs_str, &first_ttl_str
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+ , &source_route_list
+#endif
+ );
+
+#if 0 /* IGNORED */
+ if (op & OPT_IP_CHKSUM)
+ bb_error_msg("warning: ip checksums disabled");
+#endif
+ if (op & OPT_TOS)
+ tos = xatou_range(tos_str, 0, 255);
+ if (op & OPT_MAX_TTL)
+ max_ttl = xatou_range(max_ttl_str, 1, 255);
+ if (op & OPT_PORT)
+ port = xatou16(port_str);
+ if (op & OPT_NPROBES)
+ nprobes = xatou_range(nprobes_str, 1, INT_MAX);
+ if (op & OPT_SOURCE) {
+ /*
+ * set the ip source address of the outbound
+ * probe (e.g., on a multi-homed host).
+ */
+ if (getuid() != 0)
+ bb_error_msg_and_die("you must be root to use -s");
+ }
+ if (op & OPT_WAITTIME)
+ waittime = xatou_range(waittime_str, 1, 24 * 60 * 60);
+ if (op & OPT_PAUSE_MS)
+ pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000);
+ if (op & OPT_FIRST_TTL)
+ first_ttl = xatou_range(first_ttl_str, 1, max_ttl);
+
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+ if (source_route_list) {
+ while (source_route_list) {
+ len_and_sockaddr *lsa;
+
+ if (lsrr >= NGATEWAYS)
+ bb_error_msg_and_die("no more than %d gateways", NGATEWAYS);
+ lsa = xhost_and_af2sockaddr(llist_pop(&source_route_list), 0, AF_INET);
+ gwlist[lsrr] = lsa->u.sin.sin_addr.s_addr;
+ free(lsa);
+ ++lsrr;
}
- argc -= optind;
+ optlen = (lsrr + 1) * sizeof(gwlist[0]);
+ }
+#endif
+
+ minpacket = sizeof(*outip) + SIZEOF_ICMP_HDR + sizeof(*outdata) + optlen;
+ if (!(op & OPT_USE_ICMP))
+ minpacket += sizeof(*outudp) - SIZEOF_ICMP_HDR;
+ packlen = minpacket;
+
+ /* Process destination and optional packet size */
argv += optind;
+ argc -= optind;
+ switch (argc) {
+ case 2:
+ packlen = xatoul_range(argv[1], minpacket, 32 * 1024);
+ /* Fall through */
+ case 1:
+ dest_lsa = xhost2sockaddr(argv[0], port);
+ break;
+ default:
+ bb_show_usage();
+ }
+
+ /* Ensure the socket fds won't be 0, 1 or 2 */
+ bb_sanitize_stdio();
- if (argc < 1)
- 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))
- 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);
- 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;
-
- ident = (getpid() & 0xffff) | 0x8000;
-
- if ((sndsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
- perror_msg_and_die(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));
+ xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), rcvsock);
+#if TRACEROUTE_SO_DEBUG
+ if (op & OPT_DEBUG)
+ setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
+ &const_int_1, sizeof(const_int_1));
#endif
- if (options & SO_DONTROUTE)
- (void) setsockopt(s, SOL_SOCKET, SO_DONTROUTE,
- (char *)&on, sizeof(on));
+ if (op & OPT_BYPASS_ROUTE)
+ setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
+ &const_int_1, sizeof(const_int_1));
+
+ if (op & OPT_USE_ICMP)
+ xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), sndsock);
+ else
+ xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), sndsock);
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+#if defined(IP_OPTIONS)
+ if (lsrr > 0) {
+ unsigned char optlist[MAX_IPOPTLEN];
+
+ /* final hop */
+ gwlist[lsrr] = dest_lsa->u.sin.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, IPPROTO_IP, 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)
- perror_msg_and_die("SO_SNDBUF");
+ if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, &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)
- perror_msg_and_die("IP_HDRINCL");
+#ifdef IP_TOS
+ if ((op & OPT_TOS) && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) {
+ bb_perror_msg_and_die("setsockopt tos %d", tos);
+ }
#endif
-#ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG
- if (options & SO_DEBUG)
- (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
- (char *)&on, sizeof(on));
+#ifdef IP_DONTFRAG
+ if (op & OPT_DONT_FRAGMNT)
+ setsockopt(sndsock, IPPROTO_IP, IP_DONTFRAG,
+ &const_int_1, sizeof(const_int_1));
#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)
- 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");
+#if TRACEROUTE_SO_DEBUG
+ if (op & OPT_DEBUG)
+ setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
+ &const_int_1, sizeof(const_int_1));
#endif
+ if (op & OPT_BYPASS_ROUTE)
+ setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
+ &const_int_1, sizeof(const_int_1));
+
+ outip = xzalloc(packlen);
+
+ if (op & OPT_USE_ICMP) {
+ ident = getpid() | 0x8000;
+ outicmp->icmp_type = ICMP_ECHO;
+ outicmp->icmp_id = htons(ident);
+ outdata = (struct outdata_t *)((char *)outicmp + SIZEOF_ICMP_HDR);
+ } else {
+ outdata = (struct outdata_t *)(outudp + 1);
}
- 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);
+ if (op & OPT_DEVICE) /* hmm, do we need error check? */
+ setsockopt_bindtodevice(sndsock, device);
+
+ if (op & OPT_SOURCE) {
+ len_and_sockaddr *source_lsa = xdotted2sockaddr(source, 0);
+ /* Ping does this (why?) */
+ if (setsockopt(sndsock, IPPROTO_IP, IP_MULTICAST_IF,
+ &source_lsa->u.sa, source_lsa->len))
+ bb_error_msg_and_die("can't set multicast source interface");
+//TODO: we can query source port we bound to,
+// and check it in replies... if we care enough
+ xbind(sndsock, &source_lsa->u.sa, source_lsa->len);
+ free(source_lsa);
+ }
- for (ttl = 1; ttl <= max_ttl; ++ttl) {
- u_long lastaddr = 0;
+ /* Revert to non-privileged user after opening sockets */
+ xsetgid(getgid());
+ xsetuid(getuid());
+
+ printf("traceroute to %s (%s)", argv[0],
+ xmalloc_sockaddr2dotted_noport(&dest_lsa->u.sa));
+ if (op & OPT_SOURCE)
+ printf(" from %s", source);
+ printf(", %d hops max, %d byte packets\n", max_ttl, packlen);
+
+ for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
+//TODO: make it protocol agnostic (get rid of sockaddr_in)
+ struct sockaddr_in from;
+ uint32_t lastaddr = 0;
+ int probe;
+ int unreachable = 0; /* counter */
+ int gotlastaddr = 0; /* flags */
int got_there = 0;
- int unreachable = 0;
+ int first = 1;
- printf("%2d ", ttl);
+ printf("%2d", ttl);
for (probe = 0; probe < nprobes; ++probe) {
- int cc, reset_timer;
- struct timeval t1, t2;
- struct timezone tz;
+ int cc;
+ unsigned t1;
+ unsigned t2;
struct ip *ip;
- (void) gettimeofday(&t1, &tz);
+ if (!first && pausemsecs > 0)
+ usleep(pausemsecs * 1000);
+ fflush(stdout);
+
+ t1 = monotonic_us();
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;
- }
+ first = 0;
+
+ while ((cc = wait_for_reply(&from)) != 0) {
+ t2 = monotonic_us();
+ i = packet_ok(cc, &from, seq);
+ /* Skip short packet */
+ if (i == 0)
+ continue;
+ if (!gotlastaddr
+ || from.sin_addr.s_addr != lastaddr
+ ) {
+ print(cc, &from);
+ lastaddr = from.sin_addr.s_addr;
+ gotlastaddr = 1;
+ }
+ print_delta_ms(t1, t2);
+ ip = (struct ip *)recv_pkt;
+ if (op & OPT_TTL_FLAG)
+ printf(" (%d)", ip->ip_ttl);
+ if (i == -2) {
+ if (ip->ip_ttl <= 1)
+ printf(" !");
+ got_there = 1;
+ break;
+ }
+ /* time exceeded in transit */
+ if (i == -1)
+ break;
+ i--;
+ switch (i) {
+ case ICMP_UNREACH_PORT:
+ if (ip->ip_ttl <= 1)
+ printf(" !");
+ got_there = 1;
+ break;
+ case ICMP_UNREACH_NET:
+ printf(" !N");
+ ++unreachable;
+ break;
+ case ICMP_UNREACH_HOST:
+ printf(" !H");
+ ++unreachable;
+ break;
+ case ICMP_UNREACH_PROTOCOL:
+ printf(" !P");
+ got_there = 1;
+ break;
+ case ICMP_UNREACH_NEEDFRAG:
+ printf(" !F-%d", pmtu);
+ ++unreachable;
+ break;
+ case ICMP_UNREACH_SRCFAIL:
+ printf(" !S");
+ ++unreachable;
+ break;
+ case ICMP_UNREACH_FILTER_PROHIB:
+ case ICMP_UNREACH_NET_PROHIB: /* misuse */
+ printf(" !A");
+ ++unreachable;
+ break;
+ case ICMP_UNREACH_HOST_PROHIB:
+ printf(" !C");
+ ++unreachable;
break;
- } else
- reset_timer = 0;
+ case ICMP_UNREACH_HOST_PRECEDENCE:
+ printf(" !V");
+ ++unreachable;
+ break;
+ case ICMP_UNREACH_PRECEDENCE_CUTOFF:
+ printf(" !C");
+ ++unreachable;
+ break;
+ case ICMP_UNREACH_NET_UNKNOWN:
+ case ICMP_UNREACH_HOST_UNKNOWN:
+ printf(" !U");
+ ++unreachable;
+ break;
+ case ICMP_UNREACH_ISOLATED:
+ printf(" !I");
+ ++unreachable;
+ break;
+ case ICMP_UNREACH_TOSNET:
+ case ICMP_UNREACH_TOSHOST:
+ printf(" !T");
+ ++unreachable;
+ break;
+ default:
+ printf(" !<%d>", i);
+ ++unreachable;
+ break;
+ }
+ break;
}
if (cc == 0)
- printf(" *");
- (void) fflush(stdout);
+ printf(" *");
+ }
+ bb_putchar('\n');
+ if (got_there
+ || (unreachable > 0 && unreachable >= nprobes - 1)
+ ) {
+ break;
}
- putchar('\n');
- if (got_there || unreachable >= nprobes-1)
- return 0;
}
-
return 0;
}
projects / oweals / busybox.git / blobdiff