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 } 671 672# if ENABLE_FEATURE_TRACEROUTE_VERBOSE 673 if (verbose) { 674 unsigned char *p; 675 char pa1[MAXHOSTNAMELEN]; 676 char pa2[MAXHOSTNAMELEN]; 677 int i; 678 679 p = (unsigned char *) (icp + 1); 680 681 printf("\n%d bytes from %s to " 682 "%s: icmp type %d (%s) code %d\n", 683 read_len, 684 inet_ntop(AF_INET6, &from_lsa->u.sin6.sin6_addr, pa1, sizeof(pa1)), 685 inet_ntop(AF_INET6, &((struct sockaddr_in6*)to)->sin6_addr, pa2, sizeof(pa2)), 686 type, pr_type(type), icp->icmp6_code); 687 688 read_len -= sizeof(struct icmp6_hdr); 689 for (i = 0; i < read_len ; i++) { 690 if (i % 16 == 0) 691 printf("%04x:", i); 692 if (i % 4 == 0) 693 bb_putchar(' '); 694 printf("%02x", p[i]); 695 if ((i % 16 == 15) && (i + 1 < read_len)) 696 bb_putchar('\n'); 697 } 698 bb_putchar('\n'); 699 } 700# endif 701 702 return 0; 703} 704#else /* !ENABLE_TRACEROUTE6 */ 705static ALWAYS_INLINE int 706packet_ok(int read_len, 707 len_and_sockaddr *from_lsa IF_NOT_FEATURE_TRACEROUTE_VERBOSE(UNUSED_PARAM), 708 struct sockaddr *to UNUSED_PARAM, 709 int seq) 710{ 711 return packet4_ok(read_len, &from_lsa->u.sin, seq); 712} 713#endif 714 715/* 716 * Construct an Internet address representation. 717 * If the -n flag has been supplied, give 718 * numeric value, otherwise try for symbolic name. 719 */ 720static void 721print_inetname(const struct sockaddr *from) 722{ 723 char *ina = xmalloc_sockaddr2dotted_noport(from); 724 725 if (option_mask32 & OPT_ADDR_NUM) { 726 printf(" %s", ina); 727 } else { 728 char *n = NULL; 729 730 if (from->sa_family != AF_INET 731 || ((struct sockaddr_in*)from)->sin_addr.s_addr != INADDR_ANY 732 ) { 733 /* Try to reverse resolve if it is not 0.0.0.0 */ 734 n = xmalloc_sockaddr2host_noport((struct sockaddr*)from); 735 } 736 printf(" %s (%s)", (n ? n : ina), ina); 737 free(n); 738 } 739 free(ina); 740} 741 742static void 743print(int read_len, const struct sockaddr *from, const struct sockaddr *to) 744{ 745 print_inetname(from); 746 747 if (verbose) { 748 char *ina = xmalloc_sockaddr2dotted_noport(to); 749#if ENABLE_TRACEROUTE6 750 if (to->sa_family == AF_INET6) { 751 read_len -= sizeof(struct ip6_hdr); 752 } else 753#endif 754 { 755 read_len -= ((struct ip*)recv_pkt)->ip_hl << 2; 756 } 757 printf(" %d bytes to %s", read_len, ina); 758 free(ina); 759 } 760} 761 762static void 763print_delta_ms(unsigned t1p, unsigned t2p) 764{ 765 unsigned tt = t2p - t1p; 766 printf(" %u.%03u ms", tt / 1000, tt % 1000); 767} 768 769/* 770 * Usage: [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl] 771 * [-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos] 772 * [-w waittime] [-z pausemsecs] host [packetlen]" 773 */ 774static int 775common_traceroute_main(int op, char **argv) 776{ 777 int i; 778 int minpacket; 779 int tos = 0; 780 int max_ttl = 30; 781 int nprobes = 3; 782 int first_ttl = 1; 783 unsigned pausemsecs = 0; 784 char *source; 785 char *device; 786 char *tos_str; 787 char *max_ttl_str; 788 char *port_str; 789 char *nprobes_str; 790 char *waittime_str; 791 char *pausemsecs_str; 792 char *first_ttl_str; 793#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE 794 llist_t *source_route_list = NULL; 795 int lsrr = 0; 796#endif 797#if ENABLE_TRACEROUTE6 798 sa_family_t af; 799#else 800 enum { af = AF_INET }; 801#endif 802 int ttl; 803 int seq; 804 len_and_sockaddr *from_lsa; 805 struct sockaddr *lastaddr; 806 struct sockaddr *to; 807 808 INIT_G(); 809 810 /* minimum 1 arg */ 811 opt_complementary = "-1:x-x" IF_FEATURE_TRACEROUTE_SOURCE_ROUTE(":g::"); 812 op |= getopt32(argv, OPT_STRING 813 , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str 814 , &source, &waittime_str, &pausemsecs_str, &first_ttl_str 815#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE 816 , &source_route_list 817#endif 818 ); 819 argv += optind; 820 821#if 0 /* IGNORED */ 822 if (op & OPT_IP_CHKSUM) 823 bb_error_msg("warning: ip checksums disabled"); 824#endif 825 if (op & OPT_TOS) 826 tos = xatou_range(tos_str, 0, 255); 827 if (op & OPT_MAX_TTL) 828 max_ttl = xatou_range(max_ttl_str, 1, 255); 829 if (op & OPT_PORT) 830 port = xatou16(port_str); 831 if (op & OPT_NPROBES) 832 nprobes = xatou_range(nprobes_str, 1, INT_MAX); 833 if (op & OPT_SOURCE) { 834 /* 835 * set the ip source address of the outbound 836 * probe (e.g., on a multi-homed host). 837 */ 838 if (getuid() != 0) 839 bb_error_msg_and_die(bb_msg_you_must_be_root); 840 } 841 if (op & OPT_WAITTIME) 842 waittime = xatou_range(waittime_str, 1, 24 * 60 * 60); 843 if (op & OPT_PAUSE_MS) 844 pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000); 845 if (op & OPT_FIRST_TTL) 846 first_ttl = xatou_range(first_ttl_str, 1, max_ttl); 847 848#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE 849 if (source_route_list) { 850 while (source_route_list) { 851 len_and_sockaddr *lsa; 852 853 if (lsrr >= NGATEWAYS) 854 bb_error_msg_and_die("no more than %d gateways", NGATEWAYS); 855 lsa = xhost_and_af2sockaddr(llist_pop(&source_route_list), 0, AF_INET); 856 gwlist[lsrr] = lsa->u.sin.sin_addr.s_addr; 857 free(lsa); 858 ++lsrr; 859 } 860 optlen = (lsrr + 1) * sizeof(gwlist[0]); 861 } 862#endif 863 864 /* Process destination and optional packet size */ 865 minpacket = sizeof(*outip) + SIZEOF_ICMP_HDR + sizeof(*outdata) + optlen; 866 if (!(op & OPT_USE_ICMP)) 867 minpacket += sizeof(*outudp) - SIZEOF_ICMP_HDR; 868#if ENABLE_TRACEROUTE6 869 af = AF_UNSPEC; 870 if (op & OPT_IPV4) 871 af = AF_INET; 872 if (op & OPT_IPV6) 873 af = AF_INET6; 874 dest_lsa = xhost_and_af2sockaddr(argv[0], port, af); 875 af = dest_lsa->u.sa.sa_family; 876 if (af == AF_INET6) 877 minpacket = sizeof(struct outdata6_t); 878#else 879 dest_lsa = xhost2sockaddr(argv[0], port); 880#endif 881 packlen = minpacket; 882 if (argv[1]) 883 packlen = xatoul_range(argv[1], minpacket, 32 * 1024); 884 885 /* Ensure the socket fds won't be 0, 1 or 2 */ 886 bb_sanitize_stdio(); 887 888#if ENABLE_TRACEROUTE6 889 if (af == AF_INET6) { 890 xmove_fd(xsocket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6), rcvsock); 891# ifdef IPV6_RECVPKTINFO 892 setsockopt(rcvsock, SOL_IPV6, IPV6_RECVPKTINFO, 893 &const_int_1, sizeof(const_int_1)); 894 setsockopt(rcvsock, SOL_IPV6, IPV6_2292PKTINFO, 895 &const_int_1, sizeof(const_int_1)); 896# else 897 setsockopt(rcvsock, SOL_IPV6, IPV6_PKTINFO, 898 &const_int_1, sizeof(const_int_1)); 899# endif 900 } else 901#endif 902 { 903 xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), rcvsock); 904 } 905 906#if TRACEROUTE_SO_DEBUG 907 if (op & OPT_DEBUG) 908 setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 909 &const_int_1, sizeof(const_int_1)); 910#endif 911 if (op & OPT_BYPASS_ROUTE) 912 setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 913 &const_int_1, sizeof(const_int_1)); 914 915#if ENABLE_TRACEROUTE6 916 if (af == AF_INET6) { 917 static const int two = 2; 918 if (setsockopt(rcvsock, SOL_RAW, IPV6_CHECKSUM, &two, sizeof(two)) < 0) 919 bb_perror_msg_and_die("setsockopt RAW_CHECKSUM"); 920 xmove_fd(xsocket(af, SOCK_DGRAM, 0), sndsock); 921 } else 922#endif 923 { 924 if (op & OPT_USE_ICMP) 925 xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), sndsock); 926 else 927 xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), sndsock); 928#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE && defined IP_OPTIONS 929 if (lsrr > 0) { 930 unsigned char optlist[MAX_IPOPTLEN]; 931 932 /* final hop */ 933 gwlist[lsrr] = dest_lsa->u.sin.sin_addr.s_addr; 934 ++lsrr; 935 936 /* force 4 byte alignment */ 937 optlist[0] = IPOPT_NOP; 938 /* loose source route option */ 939 optlist[1] = IPOPT_LSRR; 940 i = lsrr * sizeof(gwlist[0]); 941 optlist[2] = i + 3; 942 /* pointer to LSRR addresses */ 943 optlist[3] = IPOPT_MINOFF; 944 memcpy(optlist + 4, gwlist, i); 945 946 if (setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS, 947 (char *)optlist, i + sizeof(gwlist[0])) < 0) { 948 bb_perror_msg_and_die("IP_OPTIONS"); 949 } 950 } 951#endif 952 } 953 954#ifdef SO_SNDBUF 955 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, &packlen, sizeof(packlen)) < 0) { 956 bb_perror_msg_and_die("SO_SNDBUF"); 957 } 958#endif 959#ifdef IP_TOS 960 if ((op & OPT_TOS) && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) { 961 bb_perror_msg_and_die("setsockopt tos %d", tos); 962 } 963#endif 964#ifdef IP_DONTFRAG 965 if (op & OPT_DONT_FRAGMNT) 966 setsockopt(sndsock, IPPROTO_IP, IP_DONTFRAG, 967 &const_int_1, sizeof(const_int_1)); 968#endif 969#if TRACEROUTE_SO_DEBUG 970 if (op & OPT_DEBUG) 971 setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 972 &const_int_1, sizeof(const_int_1)); 973#endif 974 if (op & OPT_BYPASS_ROUTE) 975 setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 976 &const_int_1, sizeof(const_int_1)); 977 978 outip = xzalloc(packlen); 979 980 ident = getpid(); 981 982 if (af == AF_INET) { 983 if (op & OPT_USE_ICMP) { 984 ident |= 0x8000; 985 outicmp->icmp_type = ICMP_ECHO; 986 outicmp->icmp_id = htons(ident); 987 outdata = (struct outdata_t *)((char *)outicmp + SIZEOF_ICMP_HDR); 988 } else { 989 outdata = (struct outdata_t *)(outudp + 1); 990 } 991 } 992 993 if (op & OPT_DEVICE) /* hmm, do we need error check? */ 994 setsockopt_bindtodevice(sndsock, device); 995 996 if (op & OPT_SOURCE) { 997#if ENABLE_TRACEROUTE6 998// TODO: need xdotted_and_af2sockaddr? 999 len_and_sockaddr *source_lsa = xhost_and_af2sockaddr(source, 0, af); 1000#else 1001 len_and_sockaddr *source_lsa = xdotted2sockaddr(source, 0); 1002#endif 1003 /* Ping4 does this (why?) */ 1004 if (af == AF_INET) 1005 if (setsockopt(sndsock, IPPROTO_IP, IP_MULTICAST_IF, 1006 &source_lsa->u.sa, source_lsa->len)) 1007 bb_error_msg_and_die("can't set multicast source interface"); 1008//TODO: we can query source port we bound to, 1009// and check it in replies... if we care enough 1010 xbind(sndsock, &source_lsa->u.sa, source_lsa->len); 1011 free(source_lsa); 1012 } 1013#if ENABLE_TRACEROUTE6 1014 else if (af == AF_INET6) { 1015//TODO: why we don't do it for IPv4? 1016 len_and_sockaddr *source_lsa; 1017 1018 int probe_fd = xsocket(af, SOCK_DGRAM, 0); 1019 if (op & OPT_DEVICE) 1020 setsockopt_bindtodevice(probe_fd, device); 1021 set_nport(dest_lsa, htons(1025)); 1022 /* dummy connect. makes kernel pick source IP (and port) */ 1023 xconnect(probe_fd, &dest_lsa->u.sa, dest_lsa->len); 1024 set_nport(dest_lsa, htons(port)); 1025 1026 /* read IP and port */ 1027 source_lsa = get_sock_lsa(probe_fd); 1028 if (source_lsa == NULL) 1029 bb_error_msg_and_die("can't get probe addr"); 1030 1031 close(probe_fd); 1032 1033 /* bind our sockets to this IP (but not port) */ 1034 set_nport(source_lsa, 0); 1035 xbind(sndsock, &source_lsa->u.sa, source_lsa->len); 1036 xbind(rcvsock, &source_lsa->u.sa, source_lsa->len); 1037 1038 free(source_lsa); 1039 } 1040#endif 1041 1042 /* Revert to non-privileged user after opening sockets */ 1043 xsetgid(getgid()); 1044 xsetuid(getuid()); 1045 1046 printf("traceroute to %s (%s)", argv[0], 1047 xmalloc_sockaddr2dotted_noport(&dest_lsa->u.sa)); 1048 if (op & OPT_SOURCE) 1049 printf(" from %s", source); 1050 printf(", %d hops max, %d byte packets\n", max_ttl, packlen); 1051 1052 from_lsa = dup_sockaddr(dest_lsa); 1053 lastaddr = xzalloc(dest_lsa->len); 1054 to = xzalloc(dest_lsa->len); 1055 seq = 0; 1056 for (ttl = first_ttl; ttl <= max_ttl; ++ttl) { 1057 int probe; 1058 int unreachable = 0; /* counter */ 1059 int gotlastaddr = 0; /* flags */ 1060 int got_there = 0; 1061 int first = 1; 1062 1063 printf("%2d", ttl); 1064 for (probe = 0; probe < nprobes; ++probe) { 1065 int read_len; 1066 unsigned t1; 1067 unsigned t2; 1068 struct ip *ip; 1069 1070 if (!first && pausemsecs > 0) 1071 usleep(pausemsecs * 1000); 1072 fflush_all(); 1073 1074 t1 = monotonic_us(); 1075 send_probe(++seq, ttl); 1076 1077 first = 0; 1078 while ((read_len = wait_for_reply(from_lsa, to)) != 0) { 1079 t2 = monotonic_us(); 1080 i = packet_ok(read_len, from_lsa, to, seq); 1081 /* Skip short packet */ 1082 if (i == 0) 1083 continue; 1084 1085 if (!gotlastaddr 1086 || (memcmp(lastaddr, &from_lsa->u.sa, from_lsa->len) != 0) 1087 ) { 1088 print(read_len, &from_lsa->u.sa, to); 1089 memcpy(lastaddr, &from_lsa->u.sa, from_lsa->len); 1090 gotlastaddr = 1; 1091 } 1092 1093 print_delta_ms(t1, t2); 1094 ip = (struct ip *)recv_pkt; 1095 1096 if (from_lsa->u.sa.sa_family == AF_INET) 1097 if (op & OPT_TTL_FLAG) 1098 printf(" (%d)", ip->ip_ttl); 1099 1100 /* time exceeded in transit */ 1101 if (i == -1) 1102 break; 1103 i--; 1104 switch (i) { 1105#if ENABLE_TRACEROUTE6 1106 case ICMP6_DST_UNREACH_NOPORT << 8: 1107 got_there = 1; 1108 break; 1109#endif 1110 case ICMP_UNREACH_PORT: 1111 if (ip->ip_ttl <= 1) 1112 printf(" !"); 1113 got_there = 1; 1114 break; 1115 1116 case ICMP_UNREACH_NET: 1117#if ENABLE_TRACEROUTE6 && (ICMP6_DST_UNREACH_NOROUTE != ICMP_UNREACH_NET) 1118 case ICMP6_DST_UNREACH_NOROUTE << 8: 1119#endif 1120 printf(" !N"); 1121 ++unreachable; 1122 break; 1123 case ICMP_UNREACH_HOST: 1124#if ENABLE_TRACEROUTE6 1125 case ICMP6_DST_UNREACH_ADDR << 8: 1126#endif 1127 printf(" !H"); 1128 ++unreachable; 1129 break; 1130 case ICMP_UNREACH_PROTOCOL: 1131 printf(" !P"); 1132 got_there = 1; 1133 break; 1134 case ICMP_UNREACH_NEEDFRAG: 1135 printf(" !F-%d", pmtu); 1136 ++unreachable; 1137 break; 1138 case ICMP_UNREACH_SRCFAIL: 1139#if ENABLE_TRACEROUTE6 1140 case ICMP6_DST_UNREACH_ADMIN << 8: 1141#endif 1142 printf(" !S"); 1143 ++unreachable; 1144 break; 1145 case ICMP_UNREACH_FILTER_PROHIB: 1146 case ICMP_UNREACH_NET_PROHIB: /* misuse */ 1147 printf(" !A"); 1148 ++unreachable; 1149 break; 1150 case ICMP_UNREACH_HOST_PROHIB: 1151 printf(" !C"); 1152 ++unreachable; 1153 break; 1154 case ICMP_UNREACH_HOST_PRECEDENCE: 1155 printf(" !V"); 1156 ++unreachable; 1157 break; 1158 case ICMP_UNREACH_PRECEDENCE_CUTOFF: 1159 printf(" !C"); 1160 ++unreachable; 1161 break; 1162 case ICMP_UNREACH_NET_UNKNOWN: 1163 case ICMP_UNREACH_HOST_UNKNOWN: 1164 printf(" !U"); 1165 ++unreachable; 1166 break; 1167 case ICMP_UNREACH_ISOLATED: 1168 printf(" !I"); 1169 ++unreachable; 1170 break; 1171 case ICMP_UNREACH_TOSNET: 1172 case ICMP_UNREACH_TOSHOST: 1173 printf(" !T"); 1174 ++unreachable; 1175 break; 1176 default: 1177 printf(" !<%d>", i); 1178 ++unreachable; 1179 break; 1180 } 1181 break; 1182 } 1183 /* there was no packet at all? */ 1184 if (read_len == 0) 1185 printf(" *"); 1186 } 1187 bb_putchar('\n'); 1188 if (got_there 1189 || (unreachable > 0 && unreachable >= nprobes - 1) 1190 ) { 1191 break; 1192 } 1193 } 1194 1195 return 0; 1196} 1197 1198int traceroute_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 1199int traceroute_main(int argc UNUSED_PARAM, char **argv) 1200{ 1201 return common_traceroute_main(0, argv); 1202} 1203 1204#if ENABLE_TRACEROUTE6 1205int traceroute6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 1206int traceroute6_main(int argc UNUSED_PARAM, char **argv) 1207{ 1208 return common_traceroute_main(OPT_IPV6, argv); 1209} 1210#endif 1211