source: MondoRescue/branches/2.2.9/mindi-busybox/networking/traceroute.c@ 3320

Last change on this file since 3320 was 3320, checked in by Bruno Cornec, 9 years ago
  • Re-add (thanks git BTW) the 2.2.9 branch which had been destroyed in the move to 3.0
  • Property svn:eol-style set to native
File size: 35.3 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000
4 * The Regents of the University of California. All rights reserved.
5 *
6 * Busybox port by Vladimir Oleynik (C) 2005 <dzo@simtreas.ru>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that: (1) source code distributions
10 * retain the above copyright notice and this paragraph in its entirety, (2)
11 * distributions including binary code include the above copyright notice and
12 * this paragraph in its entirety in the documentation or other materials
13 * provided with the distribution, and (3) all advertising materials mentioning
14 * features or use of this software display the following acknowledgement:
15 * ``This product includes software developed by the University of California,
16 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
17 * the University nor the names of its contributors may be used to endorse
18 * or promote products derived from this software without specific prior
19 * written permission.
20 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
21 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
22 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
23 */
24
25/*
26 * traceroute6
27 *
28 * Modified for NRL 4.4BSD IPv6 release.
29 * 07/31/96 bgp
30 *
31 * Modified for Linux IPv6 by Pedro Roque <roque@di.fc.ul.pt>
32 * 31/07/1996
33 *
34 * As ICMP error messages for IPv6 now include more than 8 bytes
35 * UDP datagrams are now sent via an UDP socket instead of magic
36 * RAW socket tricks.
37 *
38 * Converted to busybox applet by Leonid Lisovskiy <lly@sf.net>
39 * 2009-11-16
40 */
41
42/*
43 * traceroute host - trace the route ip packets follow going to "host".
44 *
45 * Attempt to trace the route an ip packet would follow to some
46 * internet host. We find out intermediate hops by launching probe
47 * packets with a small ttl (time to live) then listening for an
48 * icmp "time exceeded" reply from a gateway. We start our probes
49 * with a ttl of one and increase by one until we get an icmp "port
50 * unreachable" (which means we got to "host") or hit a max (which
51 * defaults to 30 hops & can be changed with the -m flag). Three
52 * probes (change with -q flag) are sent at each ttl setting and a
53 * line is printed showing the ttl, address of the gateway and
54 * round trip time of each probe. If the probe answers come from
55 * different gateways, the address of each responding system will
56 * be printed. If there is no response within a 5 sec. timeout
57 * interval (changed with the -w flag), a "*" is printed for that
58 * probe.
59 *
60 * Probe packets are UDP format. We don't want the destination
61 * host to process them so the destination port is set to an
62 * unlikely value (if some clod on the destination is using that
63 * value, it can be changed with the -p flag).
64 *
65 * A sample use might be:
66 *
67 * [yak 71]% traceroute nis.nsf.net.
68 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
69 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms
70 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
71 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
72 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms
73 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms
74 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms
75 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms
76 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms
77 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms
78 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms
79 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms
80 *
81 * Note that lines 2 & 3 are the same. This is due to a buggy
82 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards
83 * packets with a zero ttl.
84 *
85 * A more interesting example is:
86 *
87 * [yak 72]% traceroute allspice.lcs.mit.edu.
88 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
89 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
90 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms
91 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms
92 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms
93 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms
94 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms
95 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms
96 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms
97 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms
98 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms
99 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms
100 * 12 * * *
101 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms
102 * 14 * * *
103 * 15 * * *
104 * 16 * * *
105 * 17 * * *
106 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms
107 *
108 * (I start to see why I'm having so much trouble with mail to
109 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away
110 * either don't send ICMP "time exceeded" messages or send them
111 * with a ttl too small to reach us. 14 - 17 are running the
112 * MIT C Gateway code that doesn't send "time exceeded"s. God
113 * only knows what's going on with 12.
114 *
115 * The silent gateway 12 in the above may be the result of a bug in
116 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3)
117 * sends an unreachable message using whatever ttl remains in the
118 * original datagram. Since, for gateways, the remaining ttl is
119 * zero, the icmp "time exceeded" is guaranteed to not make it back
120 * to us. The behavior of this bug is slightly more interesting
121 * when it appears on the destination system:
122 *
123 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
124 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms
125 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms
126 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms
127 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms
128 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms
129 * 7 * * *
130 * 8 * * *
131 * 9 * * *
132 * 10 * * *
133 * 11 * * *
134 * 12 * * *
135 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms !
136 *
137 * Notice that there are 12 "gateways" (13 is the final
138 * destination) and exactly the last half of them are "missing".
139 * What's really happening is that rip (a Sun-3 running Sun OS3.5)
140 * is using the ttl from our arriving datagram as the ttl in its
141 * icmp reply. So, the reply will time out on the return path
142 * (with no notice sent to anyone since icmp's aren't sent for
143 * icmp's) until we probe with a ttl that's at least twice the path
144 * length. I.e., rip is really only 7 hops away. A reply that
145 * returns with a ttl of 1 is a clue this problem exists.
146 * Traceroute prints a "!" after the time if the ttl is <= 1.
147 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or
148 * non-standard (HPUX) software, expect to see this problem
149 * frequently and/or take care picking the target host of your
150 * probes.
151 *
152 * Other possible annotations after the time are !H, !N, !P (got a host,
153 * network or protocol unreachable, respectively), !S or !F (source
154 * route failed or fragmentation needed -- neither of these should
155 * ever occur and the associated gateway is busted if you see one). If
156 * almost all the probes result in some kind of unreachable, traceroute
157 * will give up and exit.
158 *
159 * Notes
160 * -----
161 * This program must be run by root or be setuid. (I suggest that
162 * you *don't* make it setuid -- casual use could result in a lot
163 * of unnecessary traffic on our poor, congested nets.)
164 *
165 * This program requires a kernel mod that does not appear in any
166 * system available from Berkeley: A raw ip socket using proto
167 * IPPROTO_RAW must interpret the data sent as an ip datagram (as
168 * opposed to data to be wrapped in a ip datagram). See the README
169 * file that came with the source to this program for a description
170 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may
171 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
172 * MODIFIED TO RUN THIS PROGRAM.
173 *
174 * The udp port usage may appear bizarre (well, ok, it is bizarre).
175 * The problem is that an icmp message only contains 8 bytes of
176 * data from the original datagram. 8 bytes is the size of a udp
177 * header so, if we want to associate replies with the original
178 * datagram, the necessary information must be encoded into the
179 * udp header (the ip id could be used but there's no way to
180 * interlock with the kernel's assignment of ip id's and, anyway,
181 * it would have taken a lot more kernel hacking to allow this
182 * code to set the ip id). So, to allow two or more users to
183 * use traceroute simultaneously, we use this task's pid as the
184 * source port (the high bit is set to move the port number out
185 * of the "likely" range). To keep track of which probe is being
186 * replied to (so times and/or hop counts don't get confused by a
187 * reply that was delayed in transit), we increment the destination
188 * port number before each probe.
189 *
190 * Don't use this as a coding example. I was trying to find a
191 * routing problem and this code sort-of popped out after 48 hours
192 * without sleep. I was amazed it ever compiled, much less ran.
193 *
194 * I stole the idea for this program from Steve Deering. Since
195 * the first release, I've learned that had I attended the right
196 * IETF working group meetings, I also could have stolen it from Guy
197 * Almes or Matt Mathis. I don't know (or care) who came up with
198 * the idea first. I envy the originators' perspicacity and I'm
199 * glad they didn't keep the idea a secret.
200 *
201 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
202 * enhancements to the original distribution.
203 *
204 * I've hacked up a round-trip-route version of this that works by
205 * sending a loose-source-routed udp datagram through the destination
206 * back to yourself. Unfortunately, SO many gateways botch source
207 * routing, the thing is almost worthless. Maybe one day...
208 *
209 * -- Van Jacobson (van@ee.lbl.gov)
210 * Tue Dec 20 03:50:13 PST 1988
211 */
212
213#define TRACEROUTE_SO_DEBUG 0
214
215/* TODO: undefs were uncommented - ??! we have config system for that! */
216/* probably ok to remove altogether */
217//#undef CONFIG_FEATURE_TRACEROUTE_VERBOSE
218//#define CONFIG_FEATURE_TRACEROUTE_VERBOSE
219//#undef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
220//#define CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
221//#undef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
222//#define CONFIG_FEATURE_TRACEROUTE_USE_ICMP
223
224
225#include <net/if.h>
226#include <arpa/inet.h>
227#include <netinet/in.h>
228#include <netinet/udp.h>
229#include <netinet/ip.h>
230#include <netinet/ip_icmp.h>
231#if ENABLE_FEATURE_IPV6
232# include <netinet/ip6.h>
233# include <netinet/icmp6.h>
234# ifndef SOL_IPV6
235# define SOL_IPV6 IPPROTO_IPV6
236# endif
237#endif
238
239#include "libbb.h"
240#include "inet_common.h"
241
242#ifndef IPPROTO_ICMP
243# define IPPROTO_ICMP 1
244#endif
245#ifndef IPPROTO_IP
246# define IPPROTO_IP 0
247#endif
248
249
250#define OPT_STRING "FIlnrdvxt:i:m:p:q:s:w:z:f:" \
251 IF_FEATURE_TRACEROUTE_SOURCE_ROUTE("g:") \
252 "4" IF_TRACEROUTE6("6")
253enum {
254 OPT_DONT_FRAGMNT = (1 << 0), /* F */
255 OPT_USE_ICMP = (1 << 1) * ENABLE_FEATURE_TRACEROUTE_USE_ICMP, /* I */
256 OPT_TTL_FLAG = (1 << 2), /* l */
257 OPT_ADDR_NUM = (1 << 3), /* n */
258 OPT_BYPASS_ROUTE = (1 << 4), /* r */
259 OPT_DEBUG = (1 << 5), /* d */
260 OPT_VERBOSE = (1 << 6) * ENABLE_FEATURE_TRACEROUTE_VERBOSE, /* v */
261 OPT_IP_CHKSUM = (1 << 7), /* x */
262 OPT_TOS = (1 << 8), /* t */
263 OPT_DEVICE = (1 << 9), /* i */
264 OPT_MAX_TTL = (1 << 10), /* m */
265 OPT_PORT = (1 << 11), /* p */
266 OPT_NPROBES = (1 << 12), /* q */
267 OPT_SOURCE = (1 << 13), /* s */
268 OPT_WAITTIME = (1 << 14), /* w */
269 OPT_PAUSE_MS = (1 << 15), /* z */
270 OPT_FIRST_TTL = (1 << 16), /* f */
271 OPT_SOURCE_ROUTE = (1 << 17) * ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE, /* g */
272 OPT_IPV4 = (1 << (17+ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE)), /* 4 */
273 OPT_IPV6 = (1 << (18+ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE)) * ENABLE_TRACEROUTE6, /* 6 */
274};
275#define verbose (option_mask32 & OPT_VERBOSE)
276
277enum {
278 SIZEOF_ICMP_HDR = 8,
279 rcvsock = 3, /* receive (icmp) socket file descriptor */
280 sndsock = 4, /* send (udp/icmp) socket file descriptor */
281};
282
283/* Data section of the probe packet */
284struct outdata_t {
285 unsigned char seq; /* sequence number of this packet */
286 unsigned char ttl; /* ttl packet left with */
287// UNUSED. Retaining to have the same packet size.
288 struct timeval tv_UNUSED PACKED; /* time packet left */
289};
290
291#if ENABLE_TRACEROUTE6
292struct outdata6_t {
293 uint32_t ident6;
294 uint32_t seq6;
295 struct timeval tv_UNUSED PACKED; /* time packet left */
296};
297#endif
298
299struct globals {
300 struct ip *outip;
301 struct outdata_t *outdata;
302 len_and_sockaddr *dest_lsa;
303 int packlen; /* total length of packet */
304 int pmtu; /* Path MTU Discovery (RFC1191) */
305 uint32_t ident;
306 uint16_t port; // 32768 + 666; /* start udp dest port # for probe packets */
307 int waittime; // 5; /* time to wait for response (in seconds) */
308#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
309 int optlen; /* length of ip options */
310#else
311#define optlen 0
312#endif
313 unsigned char recv_pkt[512]; /* last inbound (icmp) packet */
314#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
315 /* Maximum number of gateways (include room for one noop) */
316#define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(uint32_t)))
317 /* loose source route gateway list (including room for final destination) */
318 uint32_t gwlist[NGATEWAYS + 1];
319#endif
320};
321
322#define G (*ptr_to_globals)
323#define outip (G.outip )
324#define outdata (G.outdata )
325#define dest_lsa (G.dest_lsa )
326#define packlen (G.packlen )
327#define pmtu (G.pmtu )
328#define ident (G.ident )
329#define port (G.port )
330#define waittime (G.waittime )
331#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
332# define optlen (G.optlen )
333#endif
334#define recv_pkt (G.recv_pkt )
335#define gwlist (G.gwlist )
336#define INIT_G() do { \
337 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
338 port = 32768 + 666; \
339 waittime = 5; \
340} while (0)
341
342#define outicmp ((struct icmp *)(outip + 1))
343#define outudp ((struct udphdr *)(outip + 1))
344
345
346/* libbb candidate? tftp uses this idiom too */
347static len_and_sockaddr* dup_sockaddr(const len_and_sockaddr *lsa)
348{
349 len_and_sockaddr *new_lsa = xzalloc(LSA_LEN_SIZE + lsa->len);
350 memcpy(new_lsa, lsa, LSA_LEN_SIZE + lsa->len);
351 return new_lsa;
352}
353
354
355static int
356wait_for_reply(len_and_sockaddr *from_lsa, struct sockaddr *to)
357{
358 struct pollfd pfd[1];
359 int read_len = 0;
360
361 pfd[0].fd = rcvsock;
362 pfd[0].events = POLLIN;
363 if (safe_poll(pfd, 1, waittime * 1000) > 0) {
364 read_len = recv_from_to(rcvsock,
365 recv_pkt, sizeof(recv_pkt),
366 /*flags:*/ 0,
367 &from_lsa->u.sa, to, from_lsa->len);
368 }
369
370 return read_len;
371}
372
373/*
374 * Checksum routine for Internet Protocol family headers (C Version)
375 */
376static uint16_t
377in_cksum(uint16_t *addr, int len)
378{
379 int nleft = len;
380 uint16_t *w = addr;
381 uint16_t answer;
382 int sum = 0;
383
384 /*
385 * Our algorithm is simple, using a 32 bit accumulator (sum),
386 * we add sequential 16 bit words to it, and at the end, fold
387 * back all the carry bits from the top 16 bits into the lower
388 * 16 bits.
389 */
390 while (nleft > 1) {
391 sum += *w++;
392 nleft -= 2;
393 }
394
395 /* mop up an odd byte, if necessary */
396 if (nleft == 1)
397 sum += *(unsigned char *)w;
398
399 /* add back carry outs from top 16 bits to low 16 bits */
400 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
401 sum += (sum >> 16); /* add carry */
402 answer = ~sum; /* truncate to 16 bits */
403 return answer;
404}
405
406static void
407send_probe(int seq, int ttl)
408{
409 int len, res;
410 void *out;
411
412 /* Payload */
413#if ENABLE_TRACEROUTE6
414 if (dest_lsa->u.sa.sa_family == AF_INET6) {
415 struct outdata6_t *pkt = (struct outdata6_t *) outip;
416 pkt->ident6 = htonl(ident);
417 pkt->seq6 = htonl(seq);
418 /*gettimeofday(&pkt->tv, &tz);*/
419 } else
420#endif
421 {
422 outdata->seq = seq;
423 outdata->ttl = ttl;
424// UNUSED: was storing gettimeofday's result there, but never ever checked it
425 /*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/
426
427 if (option_mask32 & OPT_USE_ICMP) {
428 outicmp->icmp_seq = htons(seq);
429
430 /* Always calculate checksum for icmp packets */
431 outicmp->icmp_cksum = 0;
432 outicmp->icmp_cksum = in_cksum((uint16_t *)outicmp,
433 packlen - (sizeof(*outip) + optlen));
434 if (outicmp->icmp_cksum == 0)
435 outicmp->icmp_cksum = 0xffff;
436 }
437 }
438
439//BUG! verbose is (x & OPT_VERBOSE), not a counter!
440#if 0 //ENABLE_FEATURE_TRACEROUTE_VERBOSE
441 /* XXX undocumented debugging hack */
442 if (verbose > 1) {
443 const uint16_t *sp;
444 int nshorts, i;
445
446 sp = (uint16_t *)outip;
447 nshorts = (unsigned)packlen / sizeof(uint16_t);
448 i = 0;
449 printf("[ %d bytes", packlen);
450 while (--nshorts >= 0) {
451 if ((i++ % 8) == 0)
452 printf("\n\t");
453 printf(" %04x", ntohs(*sp));
454 sp++;
455 }
456 if (packlen & 1) {
457 if ((i % 8) == 0)
458 printf("\n\t");
459 printf(" %02x", *(unsigned char *)sp);
460 }
461 printf("]\n");
462 }
463#endif
464
465#if ENABLE_TRACEROUTE6
466 if (dest_lsa->u.sa.sa_family == AF_INET6) {
467 res = setsockopt(sndsock, SOL_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
468 if (res < 0)
469 bb_perror_msg_and_die("setsockopt UNICAST_HOPS %d", ttl);
470 out = outip;
471 len = packlen;
472 } else
473#endif
474 {
475#if defined IP_TTL
476 res = setsockopt(sndsock, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl));
477 if (res < 0)
478 bb_perror_msg_and_die("setsockopt ttl %d", ttl);
479#endif
480 out = outicmp;
481 len = packlen - sizeof(*outip);
482 if (!(option_mask32 & OPT_USE_ICMP)) {
483 out = outdata;
484 len -= sizeof(*outudp);
485 set_nport(dest_lsa, htons(port + seq));
486 }
487 }
488
489 res = xsendto(sndsock, out, len, &dest_lsa->u.sa, dest_lsa->len);
490 if (res != len)
491 bb_info_msg("sent %d octets, ret=%d", len, res);
492}
493
494#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
495/*
496 * Convert an ICMP "type" field to a printable string.
497 */
498static const char *
499pr_type(unsigned char t)
500{
501 static const char *const ttab[] = {
502 "Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable",
503 "Source Quench", "Redirect", "ICMP 6", "ICMP 7",
504 "Echo", "Router Advert", "Router Solicit", "Time Exceeded",
505 "Param Problem", "Timestamp", "Timestamp Reply", "Info Request",
506 "Info Reply", "Mask Request", "Mask Reply"
507 };
508# if ENABLE_TRACEROUTE6
509 static const char *const ttab6[] = {
510[0] "Error", "Dest Unreachable", "Packet Too Big", "Time Exceeded",
511[4] "Param Problem",
512[8] "Echo Request", "Echo Reply", "Membership Query", "Membership Report",
513[12] "Membership Reduction", "Router Solicit", "Router Advert", "Neighbor Solicit",
514[16] "Neighbor Advert", "Redirect",
515 };
516
517 if (dest_lsa->u.sa.sa_family == AF_INET6) {
518 if (t < 5)
519 return ttab6[t];
520 if (t < 128 || t > ND_REDIRECT)
521 return "OUT-OF-RANGE";
522 return ttab6[(t & 63) + 8];
523 }
524# endif
525 if (t >= ARRAY_SIZE(ttab))
526 return "OUT-OF-RANGE";
527
528 return ttab[t];
529}
530#endif
531
532#if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
533#define packet4_ok(read_len, from, seq) \
534 packet4_ok(read_len, seq)
535#endif
536static int
537packet4_ok(int read_len, const struct sockaddr_in *from, int seq)
538{
539 const struct icmp *icp;
540 unsigned char type, code;
541 int hlen;
542 const struct ip *ip;
543
544 ip = (struct ip *) recv_pkt;
545 hlen = ip->ip_hl << 2;
546 if (read_len < hlen + ICMP_MINLEN) {
547#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
548 if (verbose)
549 printf("packet too short (%d bytes) from %s\n", read_len,
550 inet_ntoa(from->sin_addr));
551#endif
552 return 0;
553 }
554 read_len -= hlen;
555 icp = (struct icmp *)(recv_pkt + hlen);
556 type = icp->icmp_type;
557 code = icp->icmp_code;
558 /* Path MTU Discovery (RFC1191) */
559 pmtu = 0;
560 if (code == ICMP_UNREACH_NEEDFRAG)
561 pmtu = ntohs(icp->icmp_nextmtu);
562
563 if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS)
564 || type == ICMP_UNREACH
565 || type == ICMP_ECHOREPLY
566 ) {
567 const struct ip *hip;
568 const struct udphdr *up;
569
570 hip = &icp->icmp_ip;
571 hlen = hip->ip_hl << 2;
572 if (option_mask32 & OPT_USE_ICMP) {
573 struct icmp *hicmp;
574
575 /* XXX */
576 if (type == ICMP_ECHOREPLY
577 && icp->icmp_id == htons(ident)
578 && icp->icmp_seq == htons(seq)
579 ) {
580 return ICMP_UNREACH_PORT+1;
581 }
582
583 hicmp = (struct icmp *)((unsigned char *)hip + hlen);
584 if (hlen + SIZEOF_ICMP_HDR <= read_len
585 && hip->ip_p == IPPROTO_ICMP
586 && hicmp->icmp_id == htons(ident)
587 && hicmp->icmp_seq == htons(seq)
588 ) {
589 return (type == ICMP_TIMXCEED ? -1 : code + 1);
590 }
591 } else {
592 up = (struct udphdr *)((char *)hip + hlen);
593 if (hlen + 12 <= read_len
594 && hip->ip_p == IPPROTO_UDP
595// Off: since we do not form the entire IP packet,
596// but defer it to kernel, we can't set source port,
597// and thus can't check it here in the reply
598 /* && up->source == htons(ident) */
599 && up->dest == htons(port + seq)
600 ) {
601 return (type == ICMP_TIMXCEED ? -1 : code + 1);
602 }
603 }
604 }
605#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
606 if (verbose) {
607 int i;
608 uint32_t *lp = (uint32_t *)&icp->icmp_ip;
609
610 printf("\n%d bytes from %s to "
611 "%s: icmp type %d (%s) code %d\n",
612 read_len, inet_ntoa(from->sin_addr),
613 inet_ntoa(ip->ip_dst),
614 type, pr_type(type), icp->icmp_code);
615 for (i = 4; i < read_len; i += sizeof(*lp))
616 printf("%2d: x%8.8x\n", i, *lp++);
617 }
618#endif
619 return 0;
620}
621
622#if ENABLE_TRACEROUTE6
623# if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
624#define packet_ok(read_len, from_lsa, to, seq) \
625 packet_ok(read_len, from_lsa, seq)
626# endif
627static int
628packet_ok(int read_len, len_and_sockaddr *from_lsa,
629 struct sockaddr *to,
630 int seq)
631{
632 const struct icmp6_hdr *icp;
633 unsigned char type, code;
634
635 if (from_lsa->u.sa.sa_family == AF_INET)
636 return packet4_ok(read_len, &from_lsa->u.sin, seq);
637
638 icp = (struct icmp6_hdr *) recv_pkt;
639
640 type = icp->icmp6_type;
641 code = icp->icmp6_code;
642
643 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
644 || type == ICMP6_DST_UNREACH
645 ) {
646 struct ip6_hdr *hip;
647 struct udphdr *up;
648 int nexthdr;
649
650 hip = (struct ip6_hdr *)(icp + 1);
651 up = (struct udphdr *) (hip + 1);
652 nexthdr = hip->ip6_nxt;
653
654 if (nexthdr == IPPROTO_FRAGMENT) {
655 nexthdr = *(unsigned char*)up;
656 up++;
657 }
658 if (nexthdr == IPPROTO_UDP) {
659 struct outdata6_t *pkt;
660
661 pkt = (struct outdata6_t *) (up + 1);
662
663 if (ntohl(pkt->ident6) == ident
664 && ntohl(pkt->seq6) == seq
665 ) {
666 return (type == ICMP6_TIME_EXCEEDED ? -1 : (code<<8)+1);
667 }
668 }
669 }
670
671# if ENABLE_FEATURE_TRACEROUTE_VERBOSE
672 if (verbose) {
673 unsigned char *p;
674 char pa1[MAXHOSTNAMELEN];
675 char pa2[MAXHOSTNAMELEN];
676 int i;
677
678 p = (unsigned char *) (icp + 1);
679
680 printf("\n%d bytes from %s to "
681 "%s: icmp type %d (%s) code %d\n",
682 read_len,
683 inet_ntop(AF_INET6, &from_lsa->u.sin6.sin6_addr, pa1, sizeof(pa1)),
684 inet_ntop(AF_INET6, &((struct sockaddr_in6*)to)->sin6_addr, pa2, sizeof(pa2)),
685 type, pr_type(type), icp->icmp6_code);
686
687 read_len -= sizeof(struct icmp6_hdr);
688 for (i = 0; i < read_len ; i++) {
689 if (i % 16 == 0)
690 printf("%04x:", i);
691 if (i % 4 == 0)
692 bb_putchar(' ');
693 printf("%02x", p[i]);
694 if ((i % 16 == 15) && (i + 1 < read_len))
695 bb_putchar('\n');
696 }
697 bb_putchar('\n');
698 }
699# endif
700
701 return 0;
702}
703#else /* !ENABLE_TRACEROUTE6 */
704static ALWAYS_INLINE int
705packet_ok(int read_len,
706 len_and_sockaddr *from_lsa IF_NOT_FEATURE_TRACEROUTE_VERBOSE(UNUSED_PARAM),
707 struct sockaddr *to UNUSED_PARAM,
708 int seq)
709{
710 return packet4_ok(read_len, &from_lsa->u.sin, seq);
711}
712#endif
713
714/*
715 * Construct an Internet address representation.
716 * If the -n flag has been supplied, give
717 * numeric value, otherwise try for symbolic name.
718 */
719static void
720print_inetname(const struct sockaddr *from)
721{
722 char *ina = xmalloc_sockaddr2dotted_noport(from);
723
724 if (option_mask32 & OPT_ADDR_NUM) {
725 printf(" %s", ina);
726 } else {
727 char *n = NULL;
728
729 if (from->sa_family != AF_INET
730 || ((struct sockaddr_in*)from)->sin_addr.s_addr != INADDR_ANY
731 ) {
732 /* Try to reverse resolve if it is not 0.0.0.0 */
733 n = xmalloc_sockaddr2host_noport((struct sockaddr*)from);
734 }
735 printf(" %s (%s)", (n ? n : ina), ina);
736 free(n);
737 }
738 free(ina);
739}
740
741static void
742print(int read_len, const struct sockaddr *from, const struct sockaddr *to)
743{
744 print_inetname(from);
745
746 if (verbose) {
747 char *ina = xmalloc_sockaddr2dotted_noport(to);
748#if ENABLE_TRACEROUTE6
749 if (to->sa_family == AF_INET6) {
750 read_len -= sizeof(struct ip6_hdr);
751 } else
752#endif
753 {
754 read_len -= ((struct ip*)recv_pkt)->ip_hl << 2;
755 }
756 printf(" %d bytes to %s", read_len, ina);
757 free(ina);
758 }
759}
760
761static void
762print_delta_ms(unsigned t1p, unsigned t2p)
763{
764 unsigned tt = t2p - t1p;
765 printf(" %u.%03u ms", tt / 1000, tt % 1000);
766}
767
768/*
769 * Usage: [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]
770 * [-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]
771 * [-w waittime] [-z pausemsecs] host [packetlen]"
772 */
773static int
774common_traceroute_main(int op, char **argv)
775{
776 int i;
777 int minpacket;
778 int tos = 0;
779 int max_ttl = 30;
780 int nprobes = 3;
781 int first_ttl = 1;
782 unsigned pausemsecs = 0;
783 char *source;
784 char *device;
785 char *tos_str;
786 char *max_ttl_str;
787 char *port_str;
788 char *nprobes_str;
789 char *waittime_str;
790 char *pausemsecs_str;
791 char *first_ttl_str;
792#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
793 llist_t *source_route_list = NULL;
794 int lsrr = 0;
795#endif
796#if ENABLE_TRACEROUTE6
797 sa_family_t af;
798#else
799 enum { af = AF_INET };
800#endif
801 int ttl;
802 int seq;
803 len_and_sockaddr *from_lsa;
804 struct sockaddr *lastaddr;
805 struct sockaddr *to;
806
807 INIT_G();
808
809 /* minimum 1 arg */
810 opt_complementary = "-1:x-x" IF_FEATURE_TRACEROUTE_SOURCE_ROUTE(":g::");
811 op |= getopt32(argv, OPT_STRING
812 , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str
813 , &source, &waittime_str, &pausemsecs_str, &first_ttl_str
814#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
815 , &source_route_list
816#endif
817 );
818 argv += optind;
819
820#if 0 /* IGNORED */
821 if (op & OPT_IP_CHKSUM)
822 bb_error_msg("warning: ip checksums disabled");
823#endif
824 if (op & OPT_TOS)
825 tos = xatou_range(tos_str, 0, 255);
826 if (op & OPT_MAX_TTL)
827 max_ttl = xatou_range(max_ttl_str, 1, 255);
828 if (op & OPT_PORT)
829 port = xatou16(port_str);
830 if (op & OPT_NPROBES)
831 nprobes = xatou_range(nprobes_str, 1, INT_MAX);
832 if (op & OPT_SOURCE) {
833 /*
834 * set the ip source address of the outbound
835 * probe (e.g., on a multi-homed host).
836 */
837 if (getuid() != 0)
838 bb_error_msg_and_die(bb_msg_you_must_be_root);
839 }
840 if (op & OPT_WAITTIME)
841 waittime = xatou_range(waittime_str, 1, 24 * 60 * 60);
842 if (op & OPT_PAUSE_MS)
843 pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000);
844 if (op & OPT_FIRST_TTL)
845 first_ttl = xatou_range(first_ttl_str, 1, max_ttl);
846
847#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
848 if (source_route_list) {
849 while (source_route_list) {
850 len_and_sockaddr *lsa;
851
852 if (lsrr >= NGATEWAYS)
853 bb_error_msg_and_die("no more than %d gateways", NGATEWAYS);
854 lsa = xhost_and_af2sockaddr(llist_pop(&source_route_list), 0, AF_INET);
855 gwlist[lsrr] = lsa->u.sin.sin_addr.s_addr;
856 free(lsa);
857 ++lsrr;
858 }
859 optlen = (lsrr + 1) * sizeof(gwlist[0]);
860 }
861#endif
862
863 /* Process destination and optional packet size */
864 minpacket = sizeof(*outip) + SIZEOF_ICMP_HDR + sizeof(*outdata) + optlen;
865 if (!(op & OPT_USE_ICMP))
866 minpacket += sizeof(*outudp) - SIZEOF_ICMP_HDR;
867#if ENABLE_TRACEROUTE6
868 af = AF_UNSPEC;
869 if (op & OPT_IPV4)
870 af = AF_INET;
871 if (op & OPT_IPV6)
872 af = AF_INET6;
873 dest_lsa = xhost_and_af2sockaddr(argv[0], port, af);
874 af = dest_lsa->u.sa.sa_family;
875 if (af == AF_INET6)
876 minpacket = sizeof(struct outdata6_t);
877#else
878 dest_lsa = xhost2sockaddr(argv[0], port);
879#endif
880 packlen = minpacket;
881 if (argv[1])
882 packlen = xatoul_range(argv[1], minpacket, 32 * 1024);
883
884 /* Ensure the socket fds won't be 0, 1 or 2 */
885 bb_sanitize_stdio();
886
887#if ENABLE_TRACEROUTE6
888 if (af == AF_INET6) {
889 xmove_fd(xsocket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6), rcvsock);
890# ifdef IPV6_RECVPKTINFO
891 setsockopt(rcvsock, SOL_IPV6, IPV6_RECVPKTINFO,
892 &const_int_1, sizeof(const_int_1));
893 setsockopt(rcvsock, SOL_IPV6, IPV6_2292PKTINFO,
894 &const_int_1, sizeof(const_int_1));
895# else
896 setsockopt(rcvsock, SOL_IPV6, IPV6_PKTINFO,
897 &const_int_1, sizeof(const_int_1));
898# endif
899 } else
900#endif
901 {
902 xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), rcvsock);
903 }
904
905#if TRACEROUTE_SO_DEBUG
906 if (op & OPT_DEBUG)
907 setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
908 &const_int_1, sizeof(const_int_1));
909#endif
910 if (op & OPT_BYPASS_ROUTE)
911 setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
912 &const_int_1, sizeof(const_int_1));
913
914#if ENABLE_TRACEROUTE6
915 if (af == AF_INET6) {
916 static const int two = 2;
917 if (setsockopt(rcvsock, SOL_RAW, IPV6_CHECKSUM, &two, sizeof(two)) < 0)
918 bb_perror_msg_and_die("setsockopt RAW_CHECKSUM");
919 xmove_fd(xsocket(af, SOCK_DGRAM, 0), sndsock);
920 } else
921#endif
922 {
923 if (op & OPT_USE_ICMP)
924 xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), sndsock);
925 else
926 xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), sndsock);
927#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE && defined IP_OPTIONS
928 if (lsrr > 0) {
929 unsigned char optlist[MAX_IPOPTLEN];
930
931 /* final hop */
932 gwlist[lsrr] = dest_lsa->u.sin.sin_addr.s_addr;
933 ++lsrr;
934
935 /* force 4 byte alignment */
936 optlist[0] = IPOPT_NOP;
937 /* loose source route option */
938 optlist[1] = IPOPT_LSRR;
939 i = lsrr * sizeof(gwlist[0]);
940 optlist[2] = i + 3;
941 /* pointer to LSRR addresses */
942 optlist[3] = IPOPT_MINOFF;
943 memcpy(optlist + 4, gwlist, i);
944
945 if (setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS,
946 (char *)optlist, i + sizeof(gwlist[0])) < 0) {
947 bb_perror_msg_and_die("IP_OPTIONS");
948 }
949 }
950#endif
951 }
952
953#ifdef SO_SNDBUF
954 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, &packlen, sizeof(packlen)) < 0) {
955 bb_perror_msg_and_die("SO_SNDBUF");
956 }
957#endif
958#ifdef IP_TOS
959 if ((op & OPT_TOS) && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) {
960 bb_perror_msg_and_die("setsockopt tos %d", tos);
961 }
962#endif
963#ifdef IP_DONTFRAG
964 if (op & OPT_DONT_FRAGMNT)
965 setsockopt(sndsock, IPPROTO_IP, IP_DONTFRAG,
966 &const_int_1, sizeof(const_int_1));
967#endif
968#if TRACEROUTE_SO_DEBUG
969 if (op & OPT_DEBUG)
970 setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
971 &const_int_1, sizeof(const_int_1));
972#endif
973 if (op & OPT_BYPASS_ROUTE)
974 setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
975 &const_int_1, sizeof(const_int_1));
976
977 outip = xzalloc(packlen);
978
979 ident = getpid();
980
981 if (af == AF_INET) {
982 if (op & OPT_USE_ICMP) {
983 ident |= 0x8000;
984 outicmp->icmp_type = ICMP_ECHO;
985 outicmp->icmp_id = htons(ident);
986 outdata = (struct outdata_t *)((char *)outicmp + SIZEOF_ICMP_HDR);
987 } else {
988 outdata = (struct outdata_t *)(outudp + 1);
989 }
990 }
991
992 if (op & OPT_DEVICE) /* hmm, do we need error check? */
993 setsockopt_bindtodevice(sndsock, device);
994
995 if (op & OPT_SOURCE) {
996#if ENABLE_TRACEROUTE6
997// TODO: need xdotted_and_af2sockaddr?
998 len_and_sockaddr *source_lsa = xhost_and_af2sockaddr(source, 0, af);
999#else
1000 len_and_sockaddr *source_lsa = xdotted2sockaddr(source, 0);
1001#endif
1002 /* Ping4 does this (why?) */
1003 if (af == AF_INET)
1004 if (setsockopt(sndsock, IPPROTO_IP, IP_MULTICAST_IF,
1005 &source_lsa->u.sa, source_lsa->len))
1006 bb_error_msg_and_die("can't set multicast source interface");
1007//TODO: we can query source port we bound to,
1008// and check it in replies... if we care enough
1009 xbind(sndsock, &source_lsa->u.sa, source_lsa->len);
1010 free(source_lsa);
1011 }
1012#if ENABLE_TRACEROUTE6
1013 else if (af == AF_INET6) {
1014//TODO: why we don't do it for IPv4?
1015 len_and_sockaddr *source_lsa;
1016
1017 int probe_fd = xsocket(af, SOCK_DGRAM, 0);
1018 if (op & OPT_DEVICE)
1019 setsockopt_bindtodevice(probe_fd, device);
1020 set_nport(dest_lsa, htons(1025));
1021 /* dummy connect. makes kernel pick source IP (and port) */
1022 xconnect(probe_fd, &dest_lsa->u.sa, dest_lsa->len);
1023 set_nport(dest_lsa, htons(port));
1024
1025 /* read IP and port */
1026 source_lsa = get_sock_lsa(probe_fd);
1027 if (source_lsa == NULL)
1028 bb_error_msg_and_die("can't get probe addr");
1029
1030 close(probe_fd);
1031
1032 /* bind our sockets to this IP (but not port) */
1033 set_nport(source_lsa, 0);
1034 xbind(sndsock, &source_lsa->u.sa, source_lsa->len);
1035 xbind(rcvsock, &source_lsa->u.sa, source_lsa->len);
1036
1037 free(source_lsa);
1038 }
1039#endif
1040
1041 /* Revert to non-privileged user after opening sockets */
1042 xsetgid(getgid());
1043 xsetuid(getuid());
1044
1045 printf("traceroute to %s (%s)", argv[0],
1046 xmalloc_sockaddr2dotted_noport(&dest_lsa->u.sa));
1047 if (op & OPT_SOURCE)
1048 printf(" from %s", source);
1049 printf(", %d hops max, %d byte packets\n", max_ttl, packlen);
1050
1051 from_lsa = dup_sockaddr(dest_lsa);
1052 lastaddr = xzalloc(dest_lsa->len);
1053 to = xzalloc(dest_lsa->len);
1054 seq = 0;
1055 for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
1056 int probe;
1057 int unreachable = 0; /* counter */
1058 int gotlastaddr = 0; /* flags */
1059 int got_there = 0;
1060 int first = 1;
1061
1062 printf("%2d", ttl);
1063 for (probe = 0; probe < nprobes; ++probe) {
1064 int read_len;
1065 unsigned t1;
1066 unsigned t2;
1067 struct ip *ip;
1068
1069 if (!first && pausemsecs > 0)
1070 usleep(pausemsecs * 1000);
1071 fflush_all();
1072
1073 t1 = monotonic_us();
1074 send_probe(++seq, ttl);
1075
1076 first = 0;
1077 while ((read_len = wait_for_reply(from_lsa, to)) != 0) {
1078 t2 = monotonic_us();
1079 i = packet_ok(read_len, from_lsa, to, seq);
1080 /* Skip short packet */
1081 if (i == 0)
1082 continue;
1083
1084 if (!gotlastaddr
1085 || (memcmp(lastaddr, &from_lsa->u.sa, from_lsa->len) != 0)
1086 ) {
1087 print(read_len, &from_lsa->u.sa, to);
1088 memcpy(lastaddr, &from_lsa->u.sa, from_lsa->len);
1089 gotlastaddr = 1;
1090 }
1091
1092 print_delta_ms(t1, t2);
1093 ip = (struct ip *)recv_pkt;
1094
1095 if (from_lsa->u.sa.sa_family == AF_INET)
1096 if (op & OPT_TTL_FLAG)
1097 printf(" (%d)", ip->ip_ttl);
1098
1099 /* time exceeded in transit */
1100 if (i == -1)
1101 break;
1102 i--;
1103 switch (i) {
1104#if ENABLE_TRACEROUTE6
1105 case ICMP6_DST_UNREACH_NOPORT << 8:
1106 got_there = 1;
1107 break;
1108#endif
1109 case ICMP_UNREACH_PORT:
1110 if (ip->ip_ttl <= 1)
1111 printf(" !");
1112 got_there = 1;
1113 break;
1114
1115 case ICMP_UNREACH_NET:
1116#if ENABLE_TRACEROUTE6 && (ICMP6_DST_UNREACH_NOROUTE != ICMP_UNREACH_NET)
1117 case ICMP6_DST_UNREACH_NOROUTE << 8:
1118#endif
1119 printf(" !N");
1120 ++unreachable;
1121 break;
1122 case ICMP_UNREACH_HOST:
1123#if ENABLE_TRACEROUTE6
1124 case ICMP6_DST_UNREACH_ADDR << 8:
1125#endif
1126 printf(" !H");
1127 ++unreachable;
1128 break;
1129 case ICMP_UNREACH_PROTOCOL:
1130 printf(" !P");
1131 got_there = 1;
1132 break;
1133 case ICMP_UNREACH_NEEDFRAG:
1134 printf(" !F-%d", pmtu);
1135 ++unreachable;
1136 break;
1137 case ICMP_UNREACH_SRCFAIL:
1138#if ENABLE_TRACEROUTE6
1139 case ICMP6_DST_UNREACH_ADMIN << 8:
1140#endif
1141 printf(" !S");
1142 ++unreachable;
1143 break;
1144 case ICMP_UNREACH_FILTER_PROHIB:
1145 case ICMP_UNREACH_NET_PROHIB: /* misuse */
1146 printf(" !A");
1147 ++unreachable;
1148 break;
1149 case ICMP_UNREACH_HOST_PROHIB:
1150 printf(" !C");
1151 ++unreachable;
1152 break;
1153 case ICMP_UNREACH_HOST_PRECEDENCE:
1154 printf(" !V");
1155 ++unreachable;
1156 break;
1157 case ICMP_UNREACH_PRECEDENCE_CUTOFF:
1158 printf(" !C");
1159 ++unreachable;
1160 break;
1161 case ICMP_UNREACH_NET_UNKNOWN:
1162 case ICMP_UNREACH_HOST_UNKNOWN:
1163 printf(" !U");
1164 ++unreachable;
1165 break;
1166 case ICMP_UNREACH_ISOLATED:
1167 printf(" !I");
1168 ++unreachable;
1169 break;
1170 case ICMP_UNREACH_TOSNET:
1171 case ICMP_UNREACH_TOSHOST:
1172 printf(" !T");
1173 ++unreachable;
1174 break;
1175 default:
1176 printf(" !<%d>", i);
1177 ++unreachable;
1178 break;
1179 }
1180 break;
1181 }
1182 /* there was no packet at all? */
1183 if (read_len == 0)
1184 printf(" *");
1185 }
1186 bb_putchar('\n');
1187 if (got_there
1188 || (unreachable > 0 && unreachable >= nprobes - 1)
1189 ) {
1190 break;
1191 }
1192 }
1193
1194 return 0;
1195}
1196
1197int traceroute_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1198int traceroute_main(int argc UNUSED_PARAM, char **argv)
1199{
1200 return common_traceroute_main(0, argv);
1201}
1202
1203#if ENABLE_TRACEROUTE6
1204int traceroute6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1205int traceroute6_main(int argc UNUSED_PARAM, char **argv)
1206{
1207 return common_traceroute_main(OPT_IPV6, argv);
1208}
1209#endif
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