source: branches/2.2.9/mindi-busybox/networking/traceroute.c @ 2725

Last change on this file since 2725 was 2725, checked in by bruno, 8 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
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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