source: MondoRescue/branches/3.3/mindi-busybox/networking/traceroute.c@ 3621

Last change on this file since 3621 was 3621, checked in by Bruno Cornec, 7 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
File size: 36.8 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//usage:#define traceroute_trivial_usage
214//usage: "[-"IF_TRACEROUTE6("46")"FIlnrv] [-f 1ST_TTL] [-m MAXTTL] [-q PROBES] [-p PORT]\n"
215//usage: " [-t TOS] [-w WAIT_SEC]"
216//usage: IF_FEATURE_TRACEROUTE_SOURCE_ROUTE(" [-g GATEWAY]")" [-s SRC_IP] [-i IFACE]\n"
217//usage: " [-z PAUSE_MSEC] HOST [BYTES]"
218//usage:#define traceroute_full_usage "\n\n"
219//usage: "Trace the route to HOST\n"
220//usage: IF_TRACEROUTE6(
221//usage: "\n -4,-6 Force IP or IPv6 name resolution"
222//usage: )
223//usage: "\n -F Set don't fragment bit"
224//usage: IF_FEATURE_TRACEROUTE_USE_ICMP(
225//usage: "\n -I Use ICMP ECHO instead of UDP datagrams"
226//usage: )
227//usage: "\n -l Display TTL value of the returned packet"
228//Currently disabled (TRACEROUTE_SO_DEBUG==0)
229////usage: "\n -d Set SO_DEBUG options to socket"
230//usage: "\n -n Print numeric addresses"
231//usage: "\n -r Bypass routing tables, send directly to HOST"
232//usage: IF_FEATURE_TRACEROUTE_VERBOSE(
233//usage: "\n -v Verbose"
234//usage: )
235//usage: "\n -f N First number of hops (default 1)"
236//usage: "\n -m N Max number of hops"
237//usage: "\n -q N Number of probes per hop (default 3)"
238//usage: "\n -p N Base UDP port number used in probes"
239//usage: "\n (default 33434)"
240//usage: "\n -s IP Source address"
241//usage: "\n -i IFACE Source interface"
242//usage: "\n -t N Type-of-service in probe packets (default 0)"
243//usage: "\n -w SEC Time to wait for a response (default 3)"
244//usage: "\n -g IP Loose source route gateway (8 max)"
245//usage:
246//usage:#define traceroute6_trivial_usage
247//usage: "[-nrv] [-m MAXTTL] [-q PROBES] [-p PORT]\n"
248//usage: " [-t TOS] [-w WAIT_SEC] [-s SRC_IP] [-i IFACE]\n"
249//usage: " HOST [BYTES]"
250//usage:#define traceroute6_full_usage "\n\n"
251//usage: "Trace the route to HOST\n"
252//Currently disabled (TRACEROUTE_SO_DEBUG==0)
253////usage: "\n -d Set SO_DEBUG options to socket"
254//usage: "\n -n Print numeric addresses"
255//usage: "\n -r Bypass routing tables, send directly to HOST"
256//usage: IF_FEATURE_TRACEROUTE_VERBOSE(
257//usage: "\n -v Verbose"
258//usage: )
259//usage: "\n -m N Max number of hops"
260//usage: "\n -q N Number of probes per hop (default 3)"
261//usage: "\n -p N Base UDP port number used in probes"
262//usage: "\n (default 33434)"
263//usage: "\n -s IP Source address"
264//usage: "\n -i IFACE Source interface"
265//usage: "\n -t N Type-of-service in probe packets (default 0)"
266//usage: "\n -w SEC Time wait for a response (default 3)"
267
268#define TRACEROUTE_SO_DEBUG 0
269
270#include <net/if.h>
271#include <arpa/inet.h>
272#include <netinet/in.h>
273#include <netinet/udp.h>
274#include <netinet/ip.h>
275#include <netinet/ip_icmp.h>
276#if ENABLE_FEATURE_IPV6
277# include <netinet/ip6.h>
278# include <netinet/icmp6.h>
279# ifndef SOL_IPV6
280# define SOL_IPV6 IPPROTO_IPV6
281# endif
282#endif
283
284#include "libbb.h"
285#include "inet_common.h"
286
287#ifndef IPPROTO_ICMP
288# define IPPROTO_ICMP 1
289#endif
290#ifndef IPPROTO_IP
291# define IPPROTO_IP 0
292#endif
293
294
295#define OPT_STRING \
296 "FIlnrdvxt:i:m:p:q:s:w:z:f:" \
297 IF_FEATURE_TRACEROUTE_SOURCE_ROUTE("g:") \
298 "4" IF_TRACEROUTE6("6")
299enum {
300 OPT_DONT_FRAGMNT = (1 << 0), /* F */
301 OPT_USE_ICMP = (1 << 1) * ENABLE_FEATURE_TRACEROUTE_USE_ICMP, /* I */
302 OPT_TTL_FLAG = (1 << 2), /* l */
303 OPT_ADDR_NUM = (1 << 3), /* n */
304 OPT_BYPASS_ROUTE = (1 << 4), /* r */
305 OPT_DEBUG = (1 << 5), /* d */
306 OPT_VERBOSE = (1 << 6) * ENABLE_FEATURE_TRACEROUTE_VERBOSE, /* v */
307 OPT_IP_CHKSUM = (1 << 7), /* x */
308 OPT_TOS = (1 << 8), /* t */
309 OPT_DEVICE = (1 << 9), /* i */
310 OPT_MAX_TTL = (1 << 10), /* m */
311 OPT_PORT = (1 << 11), /* p */
312 OPT_NPROBES = (1 << 12), /* q */
313 OPT_SOURCE = (1 << 13), /* s */
314 OPT_WAITTIME = (1 << 14), /* w */
315 OPT_PAUSE_MS = (1 << 15), /* z */
316 OPT_FIRST_TTL = (1 << 16), /* f */
317 OPT_SOURCE_ROUTE = (1 << 17) * ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE, /* g */
318 OPT_IPV4 = (1 << (17+ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE)), /* 4 */
319 OPT_IPV6 = (1 << (18+ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE)) * ENABLE_TRACEROUTE6, /* 6 */
320};
321#define verbose (option_mask32 & OPT_VERBOSE)
322
323enum {
324 SIZEOF_ICMP_HDR = 8,
325 rcvsock = 3, /* receive (icmp) socket file descriptor */
326 sndsock = 4, /* send (udp/icmp) socket file descriptor */
327};
328
329/* Data section of the probe packet */
330struct outdata_t {
331 unsigned char seq; /* sequence number of this packet */
332 unsigned char ttl; /* ttl packet left with */
333// UNUSED. Retaining to have the same packet size.
334 struct timeval tv_UNUSED PACKED; /* time packet left */
335};
336
337#if ENABLE_TRACEROUTE6
338struct outdata6_t {
339 uint32_t ident6;
340 uint32_t seq6;
341 struct timeval tv_UNUSED PACKED; /* time packet left */
342};
343#endif
344
345struct globals {
346 struct ip *outip;
347 struct outdata_t *outdata;
348 len_and_sockaddr *dest_lsa;
349 int packlen; /* total length of packet */
350 int pmtu; /* Path MTU Discovery (RFC1191) */
351 uint32_t ident;
352 uint16_t port; // 32768 + 666; /* start udp dest port # for probe packets */
353 int waittime; // 5; /* time to wait for response (in seconds) */
354#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
355 int optlen; /* length of ip options */
356#else
357#define optlen 0
358#endif
359 unsigned char recv_pkt[512]; /* last inbound (icmp) packet */
360#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
361 /* Maximum number of gateways (include room for one noop) */
362#define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(uint32_t)))
363 /* loose source route gateway list (including room for final destination) */
364 uint32_t gwlist[NGATEWAYS + 1];
365#endif
366};
367
368#define G (*ptr_to_globals)
369#define outip (G.outip )
370#define outdata (G.outdata )
371#define dest_lsa (G.dest_lsa )
372#define packlen (G.packlen )
373#define pmtu (G.pmtu )
374#define ident (G.ident )
375#define port (G.port )
376#define waittime (G.waittime )
377#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
378# define optlen (G.optlen )
379#endif
380#define recv_pkt (G.recv_pkt )
381#define gwlist (G.gwlist )
382#define INIT_G() do { \
383 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
384 port = 32768 + 666; \
385 waittime = 5; \
386} while (0)
387
388#define outicmp ((struct icmp *)(outip + 1))
389#define outudp ((struct udphdr *)(outip + 1))
390
391
392static int
393wait_for_reply(len_and_sockaddr *from_lsa, struct sockaddr *to, unsigned *timestamp_us, int *left_ms)
394{
395 struct pollfd pfd[1];
396 int read_len = 0;
397
398 pfd[0].fd = rcvsock;
399 pfd[0].events = POLLIN;
400 if (*left_ms >= 0 && safe_poll(pfd, 1, *left_ms) > 0) {
401 unsigned t;
402
403 read_len = recv_from_to(rcvsock,
404 recv_pkt, sizeof(recv_pkt),
405 /*flags:*/ MSG_DONTWAIT,
406 &from_lsa->u.sa, to, from_lsa->len);
407 t = monotonic_us();
408 *left_ms -= (t - *timestamp_us) / 1000;
409 *timestamp_us = t;
410 }
411
412 return read_len;
413}
414
415static void
416send_probe(int seq, int ttl)
417{
418 int len, res;
419 void *out;
420
421 /* Payload */
422#if ENABLE_TRACEROUTE6
423 if (dest_lsa->u.sa.sa_family == AF_INET6) {
424 struct outdata6_t *pkt = (struct outdata6_t *) outip;
425 pkt->ident6 = htonl(ident);
426 pkt->seq6 = htonl(seq);
427 /*gettimeofday(&pkt->tv, &tz);*/
428 } else
429#endif
430 {
431 outdata->seq = seq;
432 outdata->ttl = ttl;
433// UNUSED: was storing gettimeofday's result there, but never ever checked it
434 /*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/
435
436 if (option_mask32 & OPT_USE_ICMP) {
437 outicmp->icmp_seq = htons(seq);
438
439 /* Always calculate checksum for icmp packets */
440 outicmp->icmp_cksum = 0;
441 outicmp->icmp_cksum = inet_cksum((uint16_t *)outicmp,
442 packlen - (sizeof(*outip) + optlen));
443 if (outicmp->icmp_cksum == 0)
444 outicmp->icmp_cksum = 0xffff;
445 }
446 }
447
448//BUG! verbose is (x & OPT_VERBOSE), not a counter!
449#if 0 //ENABLE_FEATURE_TRACEROUTE_VERBOSE
450 /* XXX undocumented debugging hack */
451 if (verbose > 1) {
452 const uint16_t *sp;
453 int nshorts, i;
454
455 sp = (uint16_t *)outip;
456 nshorts = (unsigned)packlen / sizeof(uint16_t);
457 i = 0;
458 printf("[ %d bytes", packlen);
459 while (--nshorts >= 0) {
460 if ((i++ % 8) == 0)
461 printf("\n\t");
462 printf(" %04x", ntohs(*sp));
463 sp++;
464 }
465 if (packlen & 1) {
466 if ((i % 8) == 0)
467 printf("\n\t");
468 printf(" %02x", *(unsigned char *)sp);
469 }
470 printf("]\n");
471 }
472#endif
473
474#if ENABLE_TRACEROUTE6
475 if (dest_lsa->u.sa.sa_family == AF_INET6) {
476 res = setsockopt_int(sndsock, SOL_IPV6, IPV6_UNICAST_HOPS, ttl);
477 if (res != 0)
478 bb_perror_msg_and_die("setsockopt(%s) %d", "UNICAST_HOPS", ttl);
479 out = outip;
480 len = packlen;
481 } else
482#endif
483 {
484#if defined IP_TTL
485 res = setsockopt_int(sndsock, IPPROTO_IP, IP_TTL, ttl);
486 if (res != 0)
487 bb_perror_msg_and_die("setsockopt(%s) %d", "TTL", ttl);
488#endif
489 out = outicmp;
490 len = packlen - sizeof(*outip);
491 if (!(option_mask32 & OPT_USE_ICMP)) {
492 out = outdata;
493 len -= sizeof(*outudp);
494 set_nport(&dest_lsa->u.sa, htons(port + seq));
495 }
496 }
497
498 res = xsendto(sndsock, out, len, &dest_lsa->u.sa, dest_lsa->len);
499 if (res != len)
500 bb_error_msg("sent %d octets, ret=%d", len, res);
501}
502
503#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
504/*
505 * Convert an ICMP "type" field to a printable string.
506 */
507static const char *
508pr_type(unsigned char t)
509{
510 static const char *const ttab[] = {
511 "Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable",
512 "Source Quench", "Redirect", "ICMP 6", "ICMP 7",
513 "Echo", "Router Advert", "Router Solicit", "Time Exceeded",
514 "Param Problem", "Timestamp", "Timestamp Reply", "Info Request",
515 "Info Reply", "Mask Request", "Mask Reply"
516 };
517# if ENABLE_TRACEROUTE6
518 static const char *const ttab6[] = {
519[0] "Error", "Dest Unreachable", "Packet Too Big", "Time Exceeded",
520[4] "Param Problem",
521[8] "Echo Request", "Echo Reply", "Membership Query", "Membership Report",
522[12] "Membership Reduction", "Router Solicit", "Router Advert", "Neighbor Solicit",
523[16] "Neighbor Advert", "Redirect",
524 };
525
526 if (dest_lsa->u.sa.sa_family == AF_INET6) {
527 if (t < 5)
528 return ttab6[t];
529 if (t < 128 || t > ND_REDIRECT)
530 return "OUT-OF-RANGE";
531 return ttab6[(t & 63) + 8];
532 }
533# endif
534 if (t >= ARRAY_SIZE(ttab))
535 return "OUT-OF-RANGE";
536
537 return ttab[t];
538}
539#endif
540
541#if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
542#define packet4_ok(read_len, from, seq) \
543 packet4_ok(read_len, seq)
544#endif
545static int
546packet4_ok(int read_len, const struct sockaddr_in *from, int seq)
547{
548 const struct icmp *icp;
549 unsigned char type, code;
550 int hlen;
551 const struct ip *ip;
552
553 ip = (struct ip *) recv_pkt;
554 hlen = ip->ip_hl << 2;
555 if (read_len < hlen + ICMP_MINLEN) {
556#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
557 if (verbose)
558 printf("packet too short (%d bytes) from %s\n", read_len,
559 inet_ntoa(from->sin_addr));
560#endif
561 return 0;
562 }
563 read_len -= hlen;
564 icp = (struct icmp *)(recv_pkt + hlen);
565 type = icp->icmp_type;
566 code = icp->icmp_code;
567 /* Path MTU Discovery (RFC1191) */
568 pmtu = 0;
569 if (code == ICMP_UNREACH_NEEDFRAG)
570 pmtu = ntohs(icp->icmp_nextmtu);
571
572 if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS)
573 || type == ICMP_UNREACH
574 || type == ICMP_ECHOREPLY
575 ) {
576 const struct ip *hip;
577 const struct udphdr *up;
578
579 hip = &icp->icmp_ip;
580 hlen = hip->ip_hl << 2;
581 if (option_mask32 & OPT_USE_ICMP) {
582 struct icmp *hicmp;
583
584 /* XXX */
585 if (type == ICMP_ECHOREPLY
586 && icp->icmp_id == htons(ident)
587 && icp->icmp_seq == htons(seq)
588 ) {
589 return ICMP_UNREACH_PORT+1;
590 }
591
592 hicmp = (struct icmp *)((unsigned char *)hip + hlen);
593 if (hlen + SIZEOF_ICMP_HDR <= read_len
594 && hip->ip_p == IPPROTO_ICMP
595 && hicmp->icmp_id == htons(ident)
596 && hicmp->icmp_seq == htons(seq)
597 ) {
598 return (type == ICMP_TIMXCEED ? -1 : code + 1);
599 }
600 } else {
601 up = (struct udphdr *)((char *)hip + hlen);
602 if (hlen + 12 <= read_len
603 && hip->ip_p == IPPROTO_UDP
604// Off: since we do not form the entire IP packet,
605// but defer it to kernel, we can't set source port,
606// and thus can't check it here in the reply
607 /* && up->source == htons(ident) */
608 && up->dest == htons(port + seq)
609 ) {
610 return (type == ICMP_TIMXCEED ? -1 : code + 1);
611 }
612 }
613 }
614#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
615 if (verbose) {
616 int i;
617 uint32_t *lp = (uint32_t *)&icp->icmp_ip;
618
619 printf("\n%d bytes from %s to "
620 "%s: icmp type %d (%s) code %d\n",
621 read_len, inet_ntoa(from->sin_addr),
622 inet_ntoa(ip->ip_dst),
623 type, pr_type(type), icp->icmp_code);
624 for (i = 4; i < read_len; i += sizeof(*lp))
625 printf("%2d: x%8.8x\n", i, *lp++);
626 }
627#endif
628 return 0;
629}
630
631#if ENABLE_TRACEROUTE6
632# if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
633#define packet_ok(read_len, from_lsa, to, seq) \
634 packet_ok(read_len, from_lsa, seq)
635# endif
636static int
637packet_ok(int read_len, len_and_sockaddr *from_lsa,
638 struct sockaddr *to,
639 int seq)
640{
641 const struct icmp6_hdr *icp;
642 unsigned char type, code;
643
644 if (from_lsa->u.sa.sa_family == AF_INET)
645 return packet4_ok(read_len, &from_lsa->u.sin, seq);
646
647 icp = (struct icmp6_hdr *) recv_pkt;
648
649 type = icp->icmp6_type;
650 code = icp->icmp6_code;
651
652 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
653 || type == ICMP6_DST_UNREACH
654 ) {
655 struct ip6_hdr *hip;
656 struct udphdr *up;
657 int nexthdr;
658
659 hip = (struct ip6_hdr *)(icp + 1);
660 up = (struct udphdr *) (hip + 1);
661 nexthdr = hip->ip6_nxt;
662
663 if (nexthdr == IPPROTO_FRAGMENT) {
664 nexthdr = *(unsigned char*)up;
665 up++;
666 }
667 if (nexthdr == IPPROTO_UDP) {
668 struct outdata6_t *pkt;
669
670 pkt = (struct outdata6_t *) (up + 1);
671
672 if (ntohl(pkt->ident6) == ident
673 && ntohl(pkt->seq6) == seq
674 ) {
675 return (type == ICMP6_TIME_EXCEEDED ? -1 : (code<<8)+1);
676 }
677 }
678 }
679
680# if ENABLE_FEATURE_TRACEROUTE_VERBOSE
681 if (verbose) {
682 unsigned char *p;
683 char pa1[MAXHOSTNAMELEN];
684 char pa2[MAXHOSTNAMELEN];
685 int i;
686
687 p = (unsigned char *) (icp + 1);
688
689 printf("\n%d bytes from %s to "
690 "%s: icmp type %d (%s) code %d\n",
691 read_len,
692 inet_ntop(AF_INET6, &from_lsa->u.sin6.sin6_addr, pa1, sizeof(pa1)),
693 inet_ntop(AF_INET6, &((struct sockaddr_in6*)to)->sin6_addr, pa2, sizeof(pa2)),
694 type, pr_type(type), icp->icmp6_code);
695
696 read_len -= sizeof(struct icmp6_hdr);
697 for (i = 0; i < read_len; i++) {
698 if (i % 16 == 0)
699 printf("%04x:", i);
700 if (i % 4 == 0)
701 bb_putchar(' ');
702 printf("%02x", p[i]);
703 if ((i % 16 == 15) && (i + 1 < read_len))
704 bb_putchar('\n');
705 }
706 bb_putchar('\n');
707 }
708# endif
709
710 return 0;
711}
712#else /* !ENABLE_TRACEROUTE6 */
713static ALWAYS_INLINE int
714packet_ok(int read_len,
715 len_and_sockaddr *from_lsa IF_NOT_FEATURE_TRACEROUTE_VERBOSE(UNUSED_PARAM),
716 struct sockaddr *to UNUSED_PARAM,
717 int seq)
718{
719 return packet4_ok(read_len, &from_lsa->u.sin, seq);
720}
721#endif
722
723/*
724 * Construct an Internet address representation.
725 * If the -n flag has been supplied, give
726 * numeric value, otherwise try for symbolic name.
727 */
728static void
729print_inetname(const struct sockaddr *from)
730{
731 char *ina = xmalloc_sockaddr2dotted_noport(from);
732
733 if (option_mask32 & OPT_ADDR_NUM) {
734 printf(" %s", ina);
735 } else {
736 char *n = NULL;
737
738 if (from->sa_family != AF_INET
739 || ((struct sockaddr_in*)from)->sin_addr.s_addr != INADDR_ANY
740 ) {
741 /* Try to reverse resolve if it is not 0.0.0.0 */
742 n = xmalloc_sockaddr2host_noport((struct sockaddr*)from);
743 }
744 printf(" %s (%s)", (n ? n : ina), ina);
745 free(n);
746 }
747 free(ina);
748}
749
750static void
751print(int read_len, const struct sockaddr *from, const struct sockaddr *to)
752{
753 print_inetname(from);
754
755 if (verbose) {
756 char *ina = xmalloc_sockaddr2dotted_noport(to);
757#if ENABLE_TRACEROUTE6
758 if (to->sa_family == AF_INET6) {
759 read_len -= sizeof(struct ip6_hdr);
760 } else
761#endif
762 {
763 struct ip *ip4packet = (struct ip*)recv_pkt;
764 read_len -= ip4packet->ip_hl << 2;
765 }
766 printf(" %d bytes to %s", read_len, ina);
767 free(ina);
768 }
769}
770
771static void
772print_delta_ms(unsigned t1p, unsigned t2p)
773{
774 unsigned tt = t2p - t1p;
775 printf(" %u.%03u ms", tt / 1000, tt % 1000);
776}
777
778/*
779 * Usage: [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]
780 * [-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]
781 * [-w waittime] [-z pausemsecs] host [packetlen]"
782 */
783static int
784common_traceroute_main(int op, char **argv)
785{
786 int minpacket;
787#ifdef IP_TOS
788 int tos = 0;
789#endif
790 int max_ttl = 30;
791 int nprobes = 3;
792 int first_ttl = 1;
793 unsigned pausemsecs = 0;
794 char *source;
795 char *device;
796 char *tos_str;
797 char *max_ttl_str;
798 char *port_str;
799 char *nprobes_str;
800 char *waittime_str;
801 char *pausemsecs_str;
802 char *first_ttl_str;
803 char *dest_str;
804#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
805 llist_t *source_route_list = NULL;
806 int lsrr = 0;
807#endif
808#if ENABLE_TRACEROUTE6
809 sa_family_t af;
810#else
811 enum { af = AF_INET };
812#endif
813 int ttl;
814 int seq;
815 len_and_sockaddr *from_lsa;
816 struct sockaddr *lastaddr;
817 struct sockaddr *to;
818
819 INIT_G();
820
821 /* minimum 1 arg */
822 opt_complementary = "-1:x-x" IF_FEATURE_TRACEROUTE_SOURCE_ROUTE(":g::");
823 op |= getopt32(argv, OPT_STRING
824 , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str
825 , &source, &waittime_str, &pausemsecs_str, &first_ttl_str
826#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
827 , &source_route_list
828#endif
829 );
830 argv += optind;
831
832#if 0 /* IGNORED */
833 if (op & OPT_IP_CHKSUM)
834 bb_error_msg("warning: ip checksums disabled");
835#endif
836#ifdef IP_TOS
837 if (op & OPT_TOS)
838 tos = xatou_range(tos_str, 0, 255);
839#endif
840 if (op & OPT_MAX_TTL)
841 max_ttl = xatou_range(max_ttl_str, 1, 255);
842 if (op & OPT_PORT)
843 port = xatou16(port_str);
844 if (op & OPT_NPROBES)
845 nprobes = xatou_range(nprobes_str, 1, INT_MAX);
846 if (op & OPT_SOURCE) {
847 /*
848 * set the ip source address of the outbound
849 * probe (e.g., on a multi-homed host).
850 */
851 if (getuid() != 0)
852 bb_error_msg_and_die(bb_msg_you_must_be_root);
853 }
854 if (op & OPT_WAITTIME)
855 waittime = xatou_range(waittime_str, 1, 24 * 60 * 60);
856 if (op & OPT_PAUSE_MS)
857 pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000);
858 if (op & OPT_FIRST_TTL)
859 first_ttl = xatou_range(first_ttl_str, 1, max_ttl);
860
861#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
862 if (source_route_list) {
863 while (source_route_list) {
864 len_and_sockaddr *lsa;
865
866 if (lsrr >= NGATEWAYS)
867 bb_error_msg_and_die("no more than %d gateways", NGATEWAYS);
868 lsa = xhost_and_af2sockaddr(llist_pop(&source_route_list), 0, AF_INET);
869 gwlist[lsrr] = lsa->u.sin.sin_addr.s_addr;
870 free(lsa);
871 ++lsrr;
872 }
873 optlen = (lsrr + 1) * sizeof(gwlist[0]);
874 }
875#endif
876
877 /* Process destination and optional packet size */
878 minpacket = sizeof(*outip) + SIZEOF_ICMP_HDR + sizeof(*outdata) + optlen;
879 if (!(op & OPT_USE_ICMP))
880 minpacket += sizeof(*outudp) - SIZEOF_ICMP_HDR;
881#if ENABLE_TRACEROUTE6
882 af = AF_UNSPEC;
883 if (op & OPT_IPV4)
884 af = AF_INET;
885 if (op & OPT_IPV6)
886 af = AF_INET6;
887 dest_lsa = xhost_and_af2sockaddr(argv[0], port, af);
888 af = dest_lsa->u.sa.sa_family;
889 if (af == AF_INET6)
890 minpacket = sizeof(struct outdata6_t);
891#else
892 dest_lsa = xhost2sockaddr(argv[0], port);
893#endif
894 packlen = minpacket;
895 if (argv[1])
896 packlen = xatoul_range(argv[1], minpacket, 32 * 1024);
897
898 /* Ensure the socket fds won't be 0, 1 or 2 */
899 bb_sanitize_stdio();
900
901#if ENABLE_TRACEROUTE6
902 if (af == AF_INET6) {
903 xmove_fd(xsocket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6), rcvsock);
904# ifdef IPV6_RECVPKTINFO
905 setsockopt_1(rcvsock, SOL_IPV6, IPV6_RECVPKTINFO);
906 setsockopt_1(rcvsock, SOL_IPV6, IPV6_2292PKTINFO);
907# else
908 setsockopt_1(rcvsock, SOL_IPV6, IPV6_PKTINFO);
909# endif
910 } else
911#endif
912 {
913 xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), rcvsock);
914 }
915
916#if TRACEROUTE_SO_DEBUG
917 if (op & OPT_DEBUG)
918 setsockopt_SOL_SOCKET_1(rcvsock, SO_DEBUG);
919#endif
920 if (op & OPT_BYPASS_ROUTE)
921 setsockopt_SOL_SOCKET_1(rcvsock, SO_DONTROUTE);
922
923#if ENABLE_TRACEROUTE6
924 if (af == AF_INET6) {
925 if (setsockopt_int(rcvsock, SOL_RAW, IPV6_CHECKSUM, 2) != 0)
926 bb_perror_msg_and_die("setsockopt(%s)", "IPV6_CHECKSUM");
927 xmove_fd(xsocket(af, SOCK_DGRAM, 0), sndsock);
928 } else
929#endif
930 {
931 if (op & OPT_USE_ICMP)
932 xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), sndsock);
933 else
934 xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), sndsock);
935#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE && defined IP_OPTIONS
936 if (lsrr > 0) {
937 unsigned char optlist[MAX_IPOPTLEN];
938 unsigned size;
939
940 /* final hop */
941 gwlist[lsrr] = dest_lsa->u.sin.sin_addr.s_addr;
942 ++lsrr;
943
944 /* force 4 byte alignment */
945 optlist[0] = IPOPT_NOP;
946 /* loose source route option */
947 optlist[1] = IPOPT_LSRR;
948 size = lsrr * sizeof(gwlist[0]);
949 optlist[2] = size + 3;
950 /* pointer to LSRR addresses */
951 optlist[3] = IPOPT_MINOFF;
952 memcpy(optlist + 4, gwlist, size);
953
954 if (setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS,
955 (char *)optlist, size + sizeof(gwlist[0])) < 0) {
956 bb_perror_msg_and_die("IP_OPTIONS");
957 }
958 }
959#endif
960 }
961
962#ifdef SO_SNDBUF
963 if (setsockopt_SOL_SOCKET_int(sndsock, SO_SNDBUF, packlen) != 0) {
964 bb_perror_msg_and_die("setsockopt(%s)", "SO_SNDBUF");
965 }
966#endif
967#ifdef IP_TOS
968 if ((op & OPT_TOS) && setsockopt_int(sndsock, IPPROTO_IP, IP_TOS, tos) != 0) {
969 bb_perror_msg_and_die("setsockopt(%s) %d", "TOS", tos);
970 }
971#endif
972#ifdef IP_DONTFRAG
973 if (op & OPT_DONT_FRAGMNT)
974 setsockopt_1(sndsock, IPPROTO_IP, IP_DONTFRAG);
975#endif
976#if TRACEROUTE_SO_DEBUG
977 if (op & OPT_DEBUG)
978 setsockopt_SOL_SOCKET_1(sndsock, SO_DEBUG);
979#endif
980 if (op & OPT_BYPASS_ROUTE)
981 setsockopt_SOL_SOCKET_1(sndsock, SO_DONTROUTE);
982
983 outip = xzalloc(packlen);
984
985 ident = getpid();
986
987 if (af == AF_INET) {
988 if (op & OPT_USE_ICMP) {
989 ident |= 0x8000;
990 outicmp->icmp_type = ICMP_ECHO;
991 outicmp->icmp_id = htons(ident);
992 outdata = (struct outdata_t *)((char *)outicmp + SIZEOF_ICMP_HDR);
993 } else {
994 outdata = (struct outdata_t *)(outudp + 1);
995 }
996 }
997
998 if (op & OPT_DEVICE) /* hmm, do we need error check? */
999 setsockopt_bindtodevice(sndsock, device);
1000
1001 if (op & OPT_SOURCE) {
1002#if ENABLE_TRACEROUTE6
1003// TODO: need xdotted_and_af2sockaddr?
1004 len_and_sockaddr *source_lsa = xhost_and_af2sockaddr(source, 0, af);
1005#else
1006 len_and_sockaddr *source_lsa = xdotted2sockaddr(source, 0);
1007#endif
1008 /* Ping4 does this (why?) */
1009 if (af == AF_INET)
1010 if (setsockopt(sndsock, IPPROTO_IP, IP_MULTICAST_IF,
1011 &source_lsa->u.sa, source_lsa->len))
1012 bb_error_msg_and_die("can't set multicast source interface");
1013//TODO: we can query source port we bound to,
1014// and check it in replies... if we care enough
1015 xbind(sndsock, &source_lsa->u.sa, source_lsa->len);
1016 free(source_lsa);
1017 }
1018#if ENABLE_TRACEROUTE6
1019 else if (af == AF_INET6) {
1020//TODO: why we don't do it for IPv4?
1021 len_and_sockaddr *source_lsa;
1022
1023 int probe_fd = xsocket(af, SOCK_DGRAM, 0);
1024 if (op & OPT_DEVICE)
1025 setsockopt_bindtodevice(probe_fd, device);
1026 set_nport(&dest_lsa->u.sa, htons(1025));
1027 /* dummy connect. makes kernel pick source IP (and port) */
1028 xconnect(probe_fd, &dest_lsa->u.sa, dest_lsa->len);
1029 set_nport(&dest_lsa->u.sa, htons(port));
1030
1031 /* read IP and port */
1032 source_lsa = get_sock_lsa(probe_fd);
1033 if (source_lsa == NULL)
1034 bb_error_msg_and_die("can't get probe addr");
1035
1036 close(probe_fd);
1037
1038 /* bind our sockets to this IP (but not port) */
1039 set_nport(&source_lsa->u.sa, 0);
1040 xbind(sndsock, &source_lsa->u.sa, source_lsa->len);
1041 xbind(rcvsock, &source_lsa->u.sa, source_lsa->len);
1042
1043 free(source_lsa);
1044 }
1045#endif
1046
1047 /* Revert to non-privileged user after opening sockets */
1048 xsetgid(getgid());
1049 xsetuid(getuid());
1050
1051 dest_str = xmalloc_sockaddr2dotted_noport(&dest_lsa->u.sa);
1052 printf("traceroute to %s (%s)", argv[0], dest_str);
1053 if (ENABLE_FEATURE_CLEAN_UP) {
1054 free(dest_str);
1055 }
1056
1057 if (op & OPT_SOURCE)
1058 printf(" from %s", source);
1059 printf(", %d hops max, %d byte packets\n", max_ttl, packlen);
1060
1061 from_lsa = xmemdup(dest_lsa, LSA_LEN_SIZE + dest_lsa->len);
1062 lastaddr = xzalloc(dest_lsa->len);
1063 to = xzalloc(dest_lsa->len);
1064 seq = 0;
1065 for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
1066 int probe;
1067 int unreachable = 0; /* counter */
1068 int gotlastaddr = 0; /* flags */
1069 int got_there = 0;
1070
1071 printf("%2d", ttl);
1072 for (probe = 0; probe < nprobes; ++probe) {
1073 int read_len;
1074 unsigned t1;
1075 unsigned t2;
1076 int left_ms;
1077 struct ip *ip;
1078
1079 fflush_all();
1080 if (probe != 0 && pausemsecs > 0)
1081 usleep(pausemsecs * 1000);
1082
1083 send_probe(++seq, ttl);
1084 t2 = t1 = monotonic_us();
1085
1086 left_ms = waittime * 1000;
1087 while ((read_len = wait_for_reply(from_lsa, to, &t2, &left_ms)) != 0) {
1088 int icmp_code;
1089
1090 /* Recv'ed a packet, or read error */
1091 /* t2 = monotonic_us() - set by wait_for_reply */
1092
1093 if (read_len < 0)
1094 continue;
1095 icmp_code = packet_ok(read_len, from_lsa, to, seq);
1096 /* Skip short packet */
1097 if (icmp_code == 0)
1098 continue;
1099
1100 if (!gotlastaddr
1101 || (memcmp(lastaddr, &from_lsa->u.sa, from_lsa->len) != 0)
1102 ) {
1103 print(read_len, &from_lsa->u.sa, to);
1104 memcpy(lastaddr, &from_lsa->u.sa, from_lsa->len);
1105 gotlastaddr = 1;
1106 }
1107
1108 print_delta_ms(t1, t2);
1109 ip = (struct ip *)recv_pkt;
1110
1111 if (from_lsa->u.sa.sa_family == AF_INET)
1112 if (op & OPT_TTL_FLAG)
1113 printf(" (%d)", ip->ip_ttl);
1114
1115 /* time exceeded in transit */
1116 if (icmp_code == -1)
1117 break;
1118 icmp_code--;
1119 switch (icmp_code) {
1120#if ENABLE_TRACEROUTE6
1121 case ICMP6_DST_UNREACH_NOPORT << 8:
1122 got_there = 1;
1123 break;
1124#endif
1125 case ICMP_UNREACH_PORT:
1126 if (ip->ip_ttl <= 1)
1127 printf(" !");
1128 got_there = 1;
1129 break;
1130
1131 case ICMP_UNREACH_NET:
1132#if ENABLE_TRACEROUTE6 && (ICMP6_DST_UNREACH_NOROUTE != ICMP_UNREACH_NET)
1133 case ICMP6_DST_UNREACH_NOROUTE << 8:
1134#endif
1135 printf(" !N");
1136 ++unreachable;
1137 break;
1138 case ICMP_UNREACH_HOST:
1139#if ENABLE_TRACEROUTE6
1140 case ICMP6_DST_UNREACH_ADDR << 8:
1141#endif
1142 printf(" !H");
1143 ++unreachable;
1144 break;
1145 case ICMP_UNREACH_PROTOCOL:
1146 printf(" !P");
1147 got_there = 1;
1148 break;
1149 case ICMP_UNREACH_NEEDFRAG:
1150 printf(" !F-%d", pmtu);
1151 ++unreachable;
1152 break;
1153 case ICMP_UNREACH_SRCFAIL:
1154#if ENABLE_TRACEROUTE6
1155 case ICMP6_DST_UNREACH_ADMIN << 8:
1156#endif
1157 printf(" !S");
1158 ++unreachable;
1159 break;
1160 case ICMP_UNREACH_FILTER_PROHIB:
1161 case ICMP_UNREACH_NET_PROHIB: /* misuse */
1162 printf(" !A");
1163 ++unreachable;
1164 break;
1165 case ICMP_UNREACH_HOST_PROHIB:
1166 printf(" !C");
1167 ++unreachable;
1168 break;
1169 case ICMP_UNREACH_HOST_PRECEDENCE:
1170 printf(" !V");
1171 ++unreachable;
1172 break;
1173 case ICMP_UNREACH_PRECEDENCE_CUTOFF:
1174 printf(" !C");
1175 ++unreachable;
1176 break;
1177 case ICMP_UNREACH_NET_UNKNOWN:
1178 case ICMP_UNREACH_HOST_UNKNOWN:
1179 printf(" !U");
1180 ++unreachable;
1181 break;
1182 case ICMP_UNREACH_ISOLATED:
1183 printf(" !I");
1184 ++unreachable;
1185 break;
1186 case ICMP_UNREACH_TOSNET:
1187 case ICMP_UNREACH_TOSHOST:
1188 printf(" !T");
1189 ++unreachable;
1190 break;
1191 default:
1192 printf(" !<%d>", icmp_code);
1193 ++unreachable;
1194 break;
1195 }
1196 break;
1197 } /* while (wait and read a packet) */
1198
1199 /* there was no packet at all? */
1200 if (read_len == 0)
1201 printf(" *");
1202 } /* for (nprobes) */
1203
1204 bb_putchar('\n');
1205 if (got_there
1206 || (unreachable > 0 && unreachable >= nprobes - 1)
1207 ) {
1208 break;
1209 }
1210 }
1211
1212 if (ENABLE_FEATURE_CLEAN_UP) {
1213 free(to);
1214 free(lastaddr);
1215 free(from_lsa);
1216 }
1217
1218 return 0;
1219}
1220
1221int traceroute_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1222int traceroute_main(int argc UNUSED_PARAM, char **argv)
1223{
1224 return common_traceroute_main(0, argv);
1225}
1226
1227#if ENABLE_TRACEROUTE6
1228int traceroute6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1229int traceroute6_main(int argc UNUSED_PARAM, char **argv)
1230{
1231 return common_traceroute_main(OPT_IPV6, argv);
1232}
1233#endif
Note: See TracBrowser for help on using the repository browser.