| File: | src/usr.sbin/traceroute/traceroute.c |
| Warning: | line 357, column 13 Although the value stored to 'rcvsock6' is used in the enclosing expression, the value is never actually read from 'rcvsock6' |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
| 1 | /* $OpenBSD: traceroute.c,v 1.168 2021/09/03 09:13:00 florian Exp $ */ |
| 2 | /* $NetBSD: traceroute.c,v 1.10 1995/05/21 15:50:45 mycroft Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of the project nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 30 | * SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | /*- |
| 34 | * Copyright (c) 1990, 1993 |
| 35 | * The Regents of the University of California. All rights reserved. |
| 36 | * |
| 37 | * This code is derived from software contributed to Berkeley by |
| 38 | * Van Jacobson. |
| 39 | * |
| 40 | * Redistribution and use in source and binary forms, with or without |
| 41 | * modification, are permitted provided that the following conditions |
| 42 | * are met: |
| 43 | * 1. Redistributions of source code must retain the above copyright |
| 44 | * notice, this list of conditions and the following disclaimer. |
| 45 | * 2. Redistributions in binary form must reproduce the above copyright |
| 46 | * notice, this list of conditions and the following disclaimer in the |
| 47 | * documentation and/or other materials provided with the distribution. |
| 48 | * 3. Neither the name of the University nor the names of its contributors |
| 49 | * may be used to endorse or promote products derived from this software |
| 50 | * without specific prior written permission. |
| 51 | * |
| 52 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 53 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 54 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 55 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 56 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 57 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 58 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 59 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 60 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 61 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 62 | * SUCH DAMAGE. |
| 63 | */ |
| 64 | |
| 65 | /* |
| 66 | * traceroute host - trace the route ip packets follow going to "host". |
| 67 | * |
| 68 | * Attempt to trace the route an ip packet would follow to some |
| 69 | * internet host. We find out intermediate hops by launching probe |
| 70 | * packets with a small ttl (time to live) then listening for an |
| 71 | * icmp "time exceeded" reply from a gateway. We start our probes |
| 72 | * with a ttl of one and increase by one until we get an icmp "port |
| 73 | * unreachable" (which means we got to "host") or hit a max (which |
| 74 | * defaults to 64 hops & can be changed with the -m flag). Three |
| 75 | * probes (change with -q flag) are sent at each ttl setting and a |
| 76 | * line is printed showing the ttl, address of the gateway and |
| 77 | * round trip time of each probe. If the probe answers come from |
| 78 | * different gateways, the address of each responding system will |
| 79 | * be printed. If there is no response within a 5 sec. timeout |
| 80 | * interval (changed with the -w flag), a "*" is printed for that |
| 81 | * probe. |
| 82 | * |
| 83 | * Probe packets are UDP format. We don't want the destination |
| 84 | * host to process them so the destination port is set to an |
| 85 | * unlikely value (if some clod on the destination is using that |
| 86 | * value, it can be changed with the -p flag). |
| 87 | * |
| 88 | * A sample use might be: |
| 89 | * |
| 90 | * [yak 71]% traceroute nis.nsf.net. |
| 91 | * traceroute to nis.nsf.net (35.1.1.48), 64 hops max, 56 byte packet |
| 92 | * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms |
| 93 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms |
| 94 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms |
| 95 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms |
| 96 | * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms |
| 97 | * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms |
| 98 | * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms |
| 99 | * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms |
| 100 | * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms |
| 101 | * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms |
| 102 | * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms |
| 103 | * |
| 104 | * Note that lines 2 & 3 are the same. This is due to a buggy |
| 105 | * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards |
| 106 | * packets with a zero ttl. |
| 107 | * |
| 108 | * A more interesting example is: |
| 109 | * |
| 110 | * [yak 72]% traceroute allspice.lcs.mit.edu. |
| 111 | * traceroute to allspice.lcs.mit.edu (18.26.0.115), 64 hops max |
| 112 | * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms |
| 113 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms |
| 114 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms |
| 115 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms |
| 116 | * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms |
| 117 | * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms |
| 118 | * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms |
| 119 | * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms |
| 120 | * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms |
| 121 | * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms |
| 122 | * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms |
| 123 | * 12 * * * |
| 124 | * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms |
| 125 | * 14 * * * |
| 126 | * 15 * * * |
| 127 | * 16 * * * |
| 128 | * 17 * * * |
| 129 | * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms |
| 130 | * |
| 131 | * (I start to see why I'm having so much trouble with mail to |
| 132 | * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away |
| 133 | * either don't send ICMP "time exceeded" messages or send them |
| 134 | * with a ttl too small to reach us. 14 - 17 are running the |
| 135 | * MIT C Gateway code that doesn't send "time exceeded"s. God |
| 136 | * only knows what's going on with 12. |
| 137 | * |
| 138 | * The silent gateway 12 in the above may be the result of a bug in |
| 139 | * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) |
| 140 | * sends an unreachable message using whatever ttl remains in the |
| 141 | * original datagram. Since, for gateways, the remaining ttl is |
| 142 | * zero, the icmp "time exceeded" is guaranteed to not make it back |
| 143 | * to us. The behavior of this bug is slightly more interesting |
| 144 | * when it appears on the destination system: |
| 145 | * |
| 146 | * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms |
| 147 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms |
| 148 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms |
| 149 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms |
| 150 | * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms |
| 151 | * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms |
| 152 | * 7 * * * |
| 153 | * 8 * * * |
| 154 | * 9 * * * |
| 155 | * 10 * * * |
| 156 | * 11 * * * |
| 157 | * 12 * * * |
| 158 | * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! |
| 159 | * |
| 160 | * Notice that there are 12 "gateways" (13 is the final |
| 161 | * destination) and exactly the last half of them are "missing". |
| 162 | * What's really happening is that rip (a Sun-3 running Sun OS3.5) |
| 163 | * is using the ttl from our arriving datagram as the ttl in its |
| 164 | * icmp reply. So, the reply will time out on the return path |
| 165 | * (with no notice sent to anyone since icmp's aren't sent for |
| 166 | * icmp's) until we probe with a ttl that's at least twice the path |
| 167 | * length. I.e., rip is really only 7 hops away. A reply that |
| 168 | * returns with a ttl of 1 is a clue this problem exists. |
| 169 | * Traceroute prints a "!" after the time if the ttl is <= 1. |
| 170 | * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or |
| 171 | * non-standard (HPUX) software, expect to see this problem |
| 172 | * frequently and/or take care picking the target host of your |
| 173 | * probes. |
| 174 | * |
| 175 | * Other possible annotations after the time are !H, !N, !P (got a host, |
| 176 | * network or protocol unreachable, respectively), !S or !F (source |
| 177 | * route failed or fragmentation needed -- neither of these should |
| 178 | * ever occur and the associated gateway is busted if you see one). If |
| 179 | * almost all the probes result in some kind of unreachable, traceroute |
| 180 | * will give up and exit. |
| 181 | * |
| 182 | * Notes |
| 183 | * ----- |
| 184 | * This program must be run by root or be setuid. (I suggest that |
| 185 | * you *don't* make it setuid -- casual use could result in a lot |
| 186 | * of unnecessary traffic on our poor, congested nets.) |
| 187 | * |
| 188 | * This program requires a kernel mod that does not appear in any |
| 189 | * system available from Berkeley: A raw ip socket using proto |
| 190 | * IPPROTO_RAW must interpret the data sent as an ip datagram (as |
| 191 | * opposed to data to be wrapped in a ip datagram). See the README |
| 192 | * file that came with the source to this program for a description |
| 193 | * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may |
| 194 | * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE |
| 195 | * MODIFIED TO RUN THIS PROGRAM. |
| 196 | * |
| 197 | * The udp port usage may appear bizarre (well, ok, it is bizarre). |
| 198 | * The problem is that an icmp message only contains 8 bytes of |
| 199 | * data from the original datagram. 8 bytes is the size of a udp |
| 200 | * header so, if we want to associate replies with the original |
| 201 | * datagram, the necessary information must be encoded into the |
| 202 | * udp header (the ip id could be used but there's no way to |
| 203 | * interlock with the kernel's assignment of ip id's and, anyway, |
| 204 | * it would have taken a lot more kernel hacking to allow this |
| 205 | * code to set the ip id). So, to allow two or more users to |
| 206 | * use traceroute simultaneously, we use this task's pid as the |
| 207 | * source port (the high bit is set to move the port number out |
| 208 | * of the "likely" range). To keep track of which probe is being |
| 209 | * replied to (so times and/or hop counts don't get confused by a |
| 210 | * reply that was delayed in transit), we increment the destination |
| 211 | * port number before each probe. |
| 212 | * |
| 213 | * Don't use this as a coding example. I was trying to find a |
| 214 | * routing problem and this code sort-of popped out after 48 hours |
| 215 | * without sleep. I was amazed it ever compiled, much less ran. |
| 216 | * |
| 217 | * I stole the idea for this program from Steve Deering. Since |
| 218 | * the first release, I've learned that had I attended the right |
| 219 | * IETF working group meetings, I also could have stolen it from Guy |
| 220 | * Almes or Matt Mathis. I don't know (or care) who came up with |
| 221 | * the idea first. I envy the originators' perspicacity and I'm |
| 222 | * glad they didn't keep the idea a secret. |
| 223 | * |
| 224 | * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or |
| 225 | * enhancements to the original distribution. |
| 226 | * |
| 227 | * I've hacked up a round-trip-route version of this that works by |
| 228 | * sending a loose-source-routed udp datagram through the destination |
| 229 | * back to yourself. Unfortunately, SO many gateways botch source |
| 230 | * routing, the thing is almost worthless. Maybe one day... |
| 231 | * |
| 232 | * -- Van Jacobson (van@helios.ee.lbl.gov) |
| 233 | * Tue Dec 20 03:50:13 PST 1988 |
| 234 | */ |
| 235 | |
| 236 | #include <sys/socket.h> |
| 237 | #include <sys/sysctl.h> |
| 238 | #include <sys/time.h> |
| 239 | #include <sys/uio.h> |
| 240 | |
| 241 | #include <netinet/in.h> |
| 242 | #include <netinet/ip.h> |
| 243 | #include <netinet/ip6.h> |
| 244 | #include <netinet/ip_icmp.h> |
| 245 | #include <netinet/icmp6.h> |
| 246 | #include <netinet/udp.h> |
| 247 | |
| 248 | #include <arpa/inet.h> |
| 249 | |
| 250 | #include <err.h> |
| 251 | #include <errno(*__errno()).h> |
| 252 | #include <event.h> |
| 253 | #include <limits.h> |
| 254 | #include <netdb.h> |
| 255 | #include <pwd.h> |
| 256 | #include <stdio.h> |
| 257 | #include <stdlib.h> |
| 258 | #include <string.h> |
| 259 | #include <unistd.h> |
| 260 | |
| 261 | #include "traceroute.h" |
| 262 | |
| 263 | int32_t sec_perturb; |
| 264 | int32_t usec_perturb; |
| 265 | |
| 266 | u_char packet[512]; |
| 267 | u_char *outpacket; /* last inbound (icmp) packet */ |
| 268 | |
| 269 | int rcvsock; /* receive (icmp) socket file descriptor */ |
| 270 | int sndsock; /* send (udp) socket file descriptor */ |
| 271 | |
| 272 | int rcvhlim; |
| 273 | struct in6_pktinfo *rcvpktinfo; |
| 274 | |
| 275 | int datalen; /* How much data */ |
| 276 | |
| 277 | char *hostname; |
| 278 | |
| 279 | u_int16_t srcport; |
| 280 | |
| 281 | void usage(void); |
| 282 | |
| 283 | #define TRACEROUTE_USER"_traceroute" "_traceroute" |
| 284 | |
| 285 | void sock_read(int, short, void *); |
| 286 | void send_timer(int, short, void *); |
| 287 | |
| 288 | struct tr_conf *conf; /* configuration defaults */ |
| 289 | struct tr_result *tr_results; |
| 290 | struct sockaddr_in from4, to4; |
| 291 | struct sockaddr_in6 from6, to6; |
| 292 | struct sockaddr *from, *to; |
| 293 | struct msghdr rcvmhdr; |
| 294 | struct event timer_ev; |
| 295 | int v6flag; |
| 296 | int *waiting_ttls; |
| 297 | int last_tos = 0; |
| 298 | |
| 299 | int |
| 300 | main(int argc, char *argv[]) |
| 301 | { |
| 302 | int mib[4] = { CTL_NET4, PF_INET2, IPPROTO_IP0, IPCTL_DEFTTL3 }; |
| 303 | char hbuf[NI_MAXHOST256]; |
| 304 | |
| 305 | struct addrinfo hints, *res; |
| 306 | struct hostent *hp; |
| 307 | struct ip *ip = NULL((void *)0); |
| 308 | struct iovec rcviov[2]; |
| 309 | static u_char *rcvcmsgbuf; |
| 310 | struct passwd *pw; |
| 311 | struct event sock_ev; |
| 312 | struct timeval tv = {0, 0}; |
| 313 | |
| 314 | long l; |
| 315 | socklen_t len; |
| 316 | size_t size; |
| 317 | |
| 318 | int ch; |
| 319 | int on = 1; |
| 320 | int error; |
| 321 | int headerlen; /* How long packet's header is */ |
| 322 | int i; |
| 323 | int packetlen; |
| 324 | int rcvcmsglen; |
| 325 | int rcvsock4, rcvsock6; |
| 326 | int sndsock4, sndsock6; |
| 327 | u_int32_t tmprnd; |
| 328 | int v4sock_errno, v6sock_errno; |
| 329 | |
| 330 | char *dest; |
| 331 | const char *errstr; |
| 332 | |
| 333 | uid_t ouid, uid; |
| 334 | gid_t gid; |
| 335 | |
| 336 | /* Cannot pledge due to special setsockopt()s below */ |
| 337 | if (unveil("/", "r") == -1) |
| 338 | err(1, "unveil /"); |
| 339 | if (unveil(NULL((void *)0), NULL((void *)0)) == -1) |
| 340 | err(1, "unveil"); |
| 341 | |
| 342 | if ((conf = calloc(1, sizeof(*conf))) == NULL((void *)0)) |
| 343 | err(1,NULL((void *)0)); |
| 344 | |
| 345 | conf->first_ttl = 1; |
| 346 | conf->proto = IPPROTO_UDP17; |
| 347 | conf->max_ttl = IPDEFTTL64; |
| 348 | conf->nprobes = 3; |
| 349 | conf->expected_responses = 2; /* icmp + DNS */ |
| 350 | |
| 351 | /* start udp dest port # for probe packets */ |
| 352 | conf->port = 32768+666; |
| 353 | |
| 354 | memset(&rcvmhdr, 0, sizeof(rcvmhdr)); |
| 355 | memset(&rcviov, 0, sizeof(rcviov)); |
| 356 | |
| 357 | rcvsock4 = rcvsock6 = sndsock4 = sndsock6 = -1; |
Although the value stored to 'rcvsock6' is used in the enclosing expression, the value is never actually read from 'rcvsock6' | |
| 358 | v4sock_errno = v6sock_errno = 0; |
| 359 | |
| 360 | conf->waittime = 3 * 1000; |
| 361 | |
| 362 | if ((rcvsock6 = socket(AF_INET624, SOCK_RAW3, IPPROTO_ICMPV658)) == -1) |
| 363 | v6sock_errno = errno(*__errno()); |
| 364 | else if ((sndsock6 = socket(AF_INET624, SOCK_DGRAM2, 0)) == -1) |
| 365 | v6sock_errno = errno(*__errno()); |
| 366 | |
| 367 | if ((rcvsock4 = socket(AF_INET2, SOCK_RAW3, IPPROTO_ICMP1)) == -1) |
| 368 | v4sock_errno = errno(*__errno()); |
| 369 | else if ((sndsock4 = socket(AF_INET2, SOCK_RAW3, IPPROTO_RAW255)) == -1) |
| 370 | v4sock_errno = errno(*__errno()); |
| 371 | |
| 372 | /* revoke privs */ |
| 373 | ouid = getuid(); |
| 374 | if (ouid == 0 && (pw = getpwnam(TRACEROUTE_USER"_traceroute")) != NULL((void *)0)) { |
| 375 | uid = pw->pw_uid; |
| 376 | gid = pw->pw_gid; |
| 377 | } else { |
| 378 | uid = getuid(); |
| 379 | gid = getgid(); |
| 380 | } |
| 381 | if (ouid && (setgroups(1, &gid) || |
| 382 | setresgid(gid, gid, gid) || |
| 383 | setresuid(uid, uid, uid))) |
| 384 | err(1, "unable to revoke privs"); |
| 385 | |
| 386 | if (strcmp("traceroute6", __progname) == 0) { |
| 387 | v6flag = 1; |
| 388 | if (v6sock_errno != 0) |
| 389 | errc(5, v6sock_errno, rcvsock6 < 0 ? "socket(ICMPv6)" : |
| 390 | "socket(SOCK_DGRAM)"); |
| 391 | rcvsock = rcvsock6; |
| 392 | sndsock = sndsock6; |
| 393 | if (rcvsock4 >= 0) |
| 394 | close(rcvsock4); |
| 395 | if (sndsock4 >= 0) |
| 396 | close(sndsock4); |
| 397 | } else { |
| 398 | if (v4sock_errno != 0) |
| 399 | errc(5, v4sock_errno, rcvsock4 < 0 ? "icmp socket" : |
| 400 | "raw socket"); |
| 401 | rcvsock = rcvsock4; |
| 402 | sndsock = sndsock4; |
| 403 | if (rcvsock6 >= 0) |
| 404 | close(rcvsock6); |
| 405 | if (sndsock6 >= 0) |
| 406 | close(sndsock6); |
| 407 | } |
| 408 | |
| 409 | if (v6flag) { |
| 410 | mib[1] = PF_INET624; |
| 411 | mib[2] = IPPROTO_IPV641; |
| 412 | mib[3] = IPV6CTL_DEFHLIM3; |
| 413 | /* specify to tell receiving interface */ |
| 414 | if (setsockopt(rcvsock, IPPROTO_IPV641, IPV6_RECVPKTINFO36, &on, |
| 415 | sizeof(on)) == -1) |
| 416 | err(1, "setsockopt(IPV6_RECVPKTINFO)"); |
| 417 | |
| 418 | /* specify to tell hoplimit field of received IP6 hdr */ |
| 419 | if (setsockopt(rcvsock, IPPROTO_IPV641, IPV6_RECVHOPLIMIT37, &on, |
| 420 | sizeof(on)) == -1) |
| 421 | err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); |
| 422 | } |
| 423 | |
| 424 | size = sizeof(i); |
| 425 | if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &i, &size, NULL((void *)0), 0) == -1) |
| 426 | err(1, "sysctl"); |
| 427 | conf->max_ttl = i; |
| 428 | |
| 429 | while ((ch = getopt(argc, argv, v6flag ? "ADdf:Ilm:np:q:Ss:t:w:vV:" : |
| 430 | "ADdf:g:Ilm:nP:p:q:Ss:t:V:vw:x")) != -1) |
| 431 | switch (ch) { |
| 432 | case 'A': |
| 433 | conf->Aflag = 1; |
| 434 | conf->expected_responses++; |
| 435 | break; |
| 436 | case 'd': |
| 437 | conf->dflag = 1; |
| 438 | break; |
| 439 | case 'D': |
| 440 | conf->dump = 1; |
| 441 | break; |
| 442 | case 'f': |
| 443 | conf->first_ttl = strtonum(optarg, 1, conf->max_ttl, |
| 444 | &errstr); |
| 445 | if (errstr) |
| 446 | errx(1, "min ttl must be 1 to %u.", |
| 447 | conf->max_ttl); |
| 448 | break; |
| 449 | case 'g': |
| 450 | if (conf->lsrr >= MAX_LSRR((40 - 4) / 4)) |
| 451 | errx(1, "too many gateways; max %d", MAX_LSRR((40 - 4) / 4)); |
| 452 | if (inet_aton(optarg, &conf->gateway[conf->lsrr]) == |
| 453 | 0) { |
| 454 | hp = gethostbyname(optarg); |
| 455 | if (hp == 0) |
| 456 | errx(1, "unknown host %s", optarg); |
| 457 | memcpy(&conf->gateway[conf->lsrr], hp->h_addrh_addr_list[0], |
| 458 | hp->h_length); |
| 459 | } |
| 460 | if (++conf->lsrr == 1) |
| 461 | conf->lsrrlen = 4; |
| 462 | conf->lsrrlen += 4; |
| 463 | break; |
| 464 | case 'I': |
| 465 | if (conf->protoset) |
| 466 | errx(1, "protocol already set with -P"); |
| 467 | conf->protoset = 1; |
| 468 | conf->proto = IPPROTO_ICMP1; |
| 469 | break; |
| 470 | case 'l': |
| 471 | conf->ttl_flag = 1; |
| 472 | break; |
| 473 | case 'm': |
| 474 | conf->max_ttl = strtonum(optarg, conf->first_ttl, |
| 475 | MAXTTL255, &errstr); |
| 476 | if (errstr) |
| 477 | errx(1, "max ttl must be %u to %u.", |
| 478 | conf->first_ttl, MAXTTL255); |
| 479 | break; |
| 480 | case 'n': |
| 481 | conf->nflag = 1; |
| 482 | conf->expected_responses--; |
| 483 | break; |
| 484 | case 'p': |
| 485 | conf->port = strtonum(optarg, 1, 65535, &errstr); |
| 486 | if (errstr) |
| 487 | errx(1, "port must be >0, <65536."); |
| 488 | break; |
| 489 | case 'P': |
| 490 | if (conf->protoset) |
| 491 | errx(1, "protocol already set with -I"); |
| 492 | conf->protoset = 1; |
| 493 | conf->proto = strtonum(optarg, 1, IPPROTO_MAX256 - 1, |
| 494 | &errstr); |
| 495 | if (errstr) { |
| 496 | struct protoent *pent; |
| 497 | |
| 498 | pent = getprotobyname(optarg); |
| 499 | if (pent) |
| 500 | conf->proto = pent->p_proto; |
| 501 | else |
| 502 | errx(1, "proto must be >=1, or a " |
| 503 | "name."); |
| 504 | } |
| 505 | break; |
| 506 | case 'q': |
| 507 | conf->nprobes = strtonum(optarg, 1, 1024, &errstr); |
| 508 | if (errstr) |
| 509 | errx(1, "nprobes must be >0."); |
| 510 | break; |
| 511 | case 's': |
| 512 | /* |
| 513 | * set the ip source address of the outbound |
| 514 | * probe (e.g., on a multi-homed host). |
| 515 | */ |
| 516 | conf->source = optarg; |
| 517 | break; |
| 518 | case 'S': |
| 519 | conf->sump = 1; |
| 520 | break; |
| 521 | case 't': |
| 522 | if (!map_tos(optarg, &conf->tos)) { |
| 523 | if (strlen(optarg) > 1 && optarg[0] == '0' && |
| 524 | optarg[1] == 'x') { |
| 525 | char *ep; |
| 526 | errno(*__errno()) = 0; |
| 527 | ep = NULL((void *)0); |
| 528 | l = strtol(optarg, &ep, 16); |
| 529 | if (errno(*__errno()) || !*optarg || *ep || |
| 530 | l < 0 || l > 255) |
| 531 | errx(1, "illegal tos value %s", |
| 532 | optarg); |
| 533 | conf->tos = (int)l; |
| 534 | } else { |
| 535 | conf->tos = strtonum(optarg, 0, 255, |
| 536 | &errstr); |
| 537 | if (errstr) |
| 538 | errx(1, "illegal tos value %s", |
| 539 | optarg); |
| 540 | } |
| 541 | } |
| 542 | conf->tflag = 1; |
| 543 | last_tos = conf->tos; |
| 544 | break; |
| 545 | case 'v': |
| 546 | conf->verbose = 1; |
| 547 | break; |
| 548 | case 'V': |
| 549 | conf->rtableid = (unsigned int)strtonum(optarg, 0, |
| 550 | RT_TABLEID_MAX255, &errstr); |
| 551 | if (errstr) |
| 552 | errx(1, "rtable value is %s: %s", |
| 553 | errstr, optarg); |
| 554 | if (setsockopt(sndsock, SOL_SOCKET0xffff, SO_RTABLE0x1021, |
| 555 | &conf->rtableid, sizeof(conf->rtableid)) == -1) |
| 556 | err(1, "setsockopt SO_RTABLE"); |
| 557 | if (setsockopt(rcvsock, SOL_SOCKET0xffff, SO_RTABLE0x1021, |
| 558 | &conf->rtableid, sizeof(conf->rtableid)) == -1) |
| 559 | err(1, "setsockopt SO_RTABLE"); |
| 560 | break; |
| 561 | case 'w': |
| 562 | conf->waittime = strtonum(optarg, 1, INT_MAX2147483647, &errstr); |
| 563 | if (errstr) |
| 564 | errx(1, "wait must be >=1 sec."); |
| 565 | conf->waittime *= 1000; |
| 566 | break; |
| 567 | case 'x': |
| 568 | conf->xflag = 1; |
| 569 | break; |
| 570 | default: |
| 571 | usage(); |
| 572 | } |
| 573 | |
| 574 | if (ouid == 0 && (setgroups(1, &gid) || |
| 575 | setresgid(gid, gid, gid) || |
| 576 | setresuid(uid, uid, uid))) |
| 577 | err(1, "unable to revoke privs"); |
| 578 | |
| 579 | argc -= optind; |
| 580 | argv += optind; |
| 581 | |
| 582 | if (argc < 1 || argc > 2) |
| 583 | usage(); |
| 584 | |
| 585 | tr_results = calloc(sizeof(struct tr_result), conf->max_ttl * |
| 586 | conf->nprobes); |
| 587 | if (tr_results == NULL((void *)0)) |
| 588 | err(1, NULL((void *)0)); |
| 589 | |
| 590 | waiting_ttls = calloc(sizeof(int), conf->max_ttl); |
| 591 | for (i = 0; i < conf->max_ttl; i++) |
| 592 | waiting_ttls[i] = conf->nprobes * conf->expected_responses; |
| 593 | |
| 594 | setvbuf(stdout(&__sF[1]), NULL((void *)0), _IOLBF1, 0); |
| 595 | |
| 596 | conf->ident = (getpid() & 0xffff) | 0x8000; |
| 597 | tmprnd = arc4random(); |
| 598 | sec_perturb = (tmprnd & 0x80000000) ? -(tmprnd & 0x7ff) : |
| 599 | (tmprnd & 0x7ff); |
| 600 | usec_perturb = arc4random(); |
| 601 | |
| 602 | memset(&to4, 0, sizeof(to4)); |
| 603 | memset(&to6, 0, sizeof(to6)); |
| 604 | |
| 605 | dest = *argv; |
| 606 | |
| 607 | memset(&hints, 0, sizeof(hints)); |
| 608 | hints.ai_family = v6flag ? PF_INET624 : PF_INET2; |
| 609 | hints.ai_socktype = SOCK_RAW3; |
| 610 | hints.ai_protocol = 0; |
| 611 | hints.ai_flags = AI_CANONNAME2; |
| 612 | if ((error = getaddrinfo(dest, NULL((void *)0), &hints, &res))) |
| 613 | errx(1, "%s", gai_strerror(error)); |
| 614 | |
| 615 | switch (res->ai_family) { |
| 616 | case AF_INET2: |
| 617 | to = (struct sockaddr *)&to4; |
| 618 | from = (struct sockaddr *)&from4; |
| 619 | break; |
| 620 | case AF_INET624: |
| 621 | to = (struct sockaddr *)&to6; |
| 622 | from = (struct sockaddr *)&from6; |
| 623 | break; |
| 624 | default: |
| 625 | errx(1, "unsupported AF: %d", res->ai_family); |
| 626 | break; |
| 627 | } |
| 628 | |
| 629 | memcpy(to, res->ai_addr, res->ai_addrlen); |
| 630 | |
| 631 | if (!hostname) { |
| 632 | hostname = res->ai_canonname ? strdup(res->ai_canonname) : dest; |
| 633 | if (!hostname) |
| 634 | errx(1, "malloc"); |
| 635 | } |
| 636 | |
| 637 | if (res->ai_next) { |
| 638 | if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, |
| 639 | sizeof(hbuf), NULL((void *)0), 0, NI_NUMERICHOST1) != 0) |
| 640 | strlcpy(hbuf, "?", sizeof(hbuf)); |
| 641 | warnx("Warning: %s has multiple " |
| 642 | "addresses; using %s", hostname, hbuf); |
| 643 | } |
| 644 | freeaddrinfo(res); |
| 645 | |
| 646 | if (*++argv) { |
| 647 | datalen = strtonum(*argv, 0, INT_MAX2147483647, &errstr); |
| 648 | if (errstr) |
| 649 | errx(1, "datalen out of range"); |
| 650 | } |
| 651 | |
| 652 | switch (to->sa_family) { |
| 653 | case AF_INET2: |
| 654 | switch (conf->proto) { |
| 655 | case IPPROTO_UDP17: |
| 656 | headerlen = (sizeof(struct ip) + conf->lsrrlen + |
| 657 | sizeof(struct udphdr) + sizeof(struct packetdata)); |
| 658 | break; |
| 659 | case IPPROTO_ICMP1: |
| 660 | headerlen = (sizeof(struct ip) + conf->lsrrlen + |
| 661 | sizeof(struct icmp) + sizeof(struct packetdata)); |
| 662 | break; |
| 663 | default: |
| 664 | headerlen = (sizeof(struct ip) + conf->lsrrlen + |
| 665 | sizeof(struct packetdata)); |
| 666 | } |
| 667 | |
| 668 | if (datalen < 0 || datalen > IP_MAXPACKET65535 - headerlen) |
| 669 | errx(1, "packet size must be 0 to %d.", |
| 670 | IP_MAXPACKET65535 - headerlen); |
| 671 | |
| 672 | datalen += headerlen; |
| 673 | |
| 674 | if ((outpacket = calloc(1, datalen)) == NULL((void *)0)) |
| 675 | err(1, "calloc"); |
| 676 | |
| 677 | rcviov[0].iov_base = (caddr_t)packet; |
| 678 | rcviov[0].iov_len = sizeof(packet); |
| 679 | rcvmhdr.msg_name = (caddr_t)&from4; |
| 680 | rcvmhdr.msg_namelen = sizeof(from4); |
| 681 | rcvmhdr.msg_iov = rcviov; |
| 682 | rcvmhdr.msg_iovlen = 1; |
| 683 | rcvmhdr.msg_control = NULL((void *)0); |
| 684 | rcvmhdr.msg_controllen = 0; |
| 685 | |
| 686 | ip = (struct ip *)outpacket; |
| 687 | if (conf->lsrr != 0) { |
| 688 | u_char *p = (u_char *)(ip + 1); |
| 689 | |
| 690 | *p++ = IPOPT_NOP1; |
| 691 | *p++ = IPOPT_LSRR131; |
| 692 | *p++ = conf->lsrrlen - 1; |
| 693 | *p++ = IPOPT_MINOFF4; |
| 694 | conf->gateway[conf->lsrr] = to4.sin_addr; |
| 695 | for (i = 1; i <= conf->lsrr; i++) { |
| 696 | memcpy(p, &conf->gateway[i], |
| 697 | sizeof(struct in_addr)); |
| 698 | p += sizeof(struct in_addr); |
| 699 | } |
| 700 | ip->ip_dst = conf->gateway[0]; |
| 701 | } else |
| 702 | ip->ip_dst = to4.sin_addr; |
| 703 | ip->ip_off = htons(0)(__uint16_t)(__builtin_constant_p(0) ? (__uint16_t)(((__uint16_t )(0) & 0xffU) << 8 | ((__uint16_t)(0) & 0xff00U ) >> 8) : __swap16md(0)); |
| 704 | ip->ip_hl = (sizeof(struct ip) + conf->lsrrlen) >> 2; |
| 705 | ip->ip_p = conf->proto; |
| 706 | ip->ip_v = IPVERSION4; |
| 707 | ip->ip_tos = conf->tos; |
| 708 | |
| 709 | if (setsockopt(sndsock, IPPROTO_IP0, IP_HDRINCL2, |
| 710 | &on, sizeof(on)) == -1) |
| 711 | err(6, "IP_HDRINCL"); |
| 712 | |
| 713 | if (conf->source) { |
| 714 | memset(&from4, 0, sizeof(from4)); |
| 715 | from4.sin_family = AF_INET2; |
| 716 | if (inet_aton(conf->source, &from4.sin_addr) == 0) |
| 717 | errx(1, "unknown host %s", conf->source); |
| 718 | ip->ip_src = from4.sin_addr; |
| 719 | if (ouid != 0 && |
| 720 | (ntohl(from4.sin_addr.s_addr)(__uint32_t)(__builtin_constant_p(from4.sin_addr.s_addr) ? (__uint32_t )(((__uint32_t)(from4.sin_addr.s_addr) & 0xff) << 24 | ((__uint32_t)(from4.sin_addr.s_addr) & 0xff00) << 8 | ((__uint32_t)(from4.sin_addr.s_addr) & 0xff0000) >> 8 | ((__uint32_t)(from4.sin_addr.s_addr) & 0xff000000) >> 24) : __swap32md(from4.sin_addr.s_addr)) & 0xff000000U) == |
| 721 | 0x7f000000U && (ntohl(to4.sin_addr.s_addr)(__uint32_t)(__builtin_constant_p(to4.sin_addr.s_addr) ? (__uint32_t )(((__uint32_t)(to4.sin_addr.s_addr) & 0xff) << 24 | ((__uint32_t)(to4.sin_addr.s_addr) & 0xff00) << 8 | ((__uint32_t)(to4.sin_addr.s_addr) & 0xff0000) >> 8 | ((__uint32_t)(to4.sin_addr.s_addr) & 0xff000000) >> 24) : __swap32md(to4.sin_addr.s_addr)) & |
| 722 | 0xff000000U) != 0x7f000000U) |
| 723 | errx(1, "source is on 127/8, destination is" |
| 724 | " not"); |
| 725 | if (ouid && bind(sndsock, (struct sockaddr *)&from4, |
| 726 | sizeof(from4)) == -1) |
| 727 | err(1, "bind"); |
| 728 | } |
| 729 | packetlen = datalen; |
| 730 | break; |
| 731 | case AF_INET624: |
| 732 | /* |
| 733 | * packetlen is the size of the complete IP packet sent and |
| 734 | * reported in the first line of output. |
| 735 | * For IPv4 this is equal to datalen since we are constructing |
| 736 | * a raw packet. |
| 737 | * For IPv6 we need to always add the size of the IP6 header |
| 738 | * and for UDP packets the size of the UDP header since they |
| 739 | * are prepended to the packet by the kernel |
| 740 | */ |
| 741 | packetlen = sizeof(struct ip6_hdr); |
| 742 | switch (conf->proto) { |
| 743 | case IPPROTO_UDP17: |
| 744 | headerlen = sizeof(struct packetdata); |
| 745 | packetlen += sizeof(struct udphdr); |
| 746 | break; |
| 747 | case IPPROTO_ICMP1: |
| 748 | headerlen = sizeof(struct icmp6_hdr) + |
| 749 | sizeof(struct packetdata); |
| 750 | break; |
| 751 | default: |
| 752 | errx(1, "Unsupported proto: %hhu", conf->proto); |
| 753 | break; |
| 754 | } |
| 755 | |
| 756 | if (datalen < 0 || datalen > IP_MAXPACKET65535 - headerlen) |
| 757 | errx(1, "packet size must be 0 to %d.", |
| 758 | IP_MAXPACKET65535 - headerlen); |
| 759 | |
| 760 | datalen += headerlen; |
| 761 | packetlen += datalen; |
| 762 | |
| 763 | if ((outpacket = calloc(1, datalen)) == NULL((void *)0)) |
| 764 | err(1, "calloc"); |
| 765 | |
| 766 | /* initialize msghdr for receiving packets */ |
| 767 | rcviov[0].iov_base = (caddr_t)packet; |
| 768 | rcviov[0].iov_len = sizeof(packet); |
| 769 | rcvmhdr.msg_name = (caddr_t)&from6; |
| 770 | rcvmhdr.msg_namelen = sizeof(from6); |
| 771 | rcvmhdr.msg_iov = rcviov; |
| 772 | rcvmhdr.msg_iovlen = 1; |
| 773 | rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo))((((unsigned long)(sizeof(struct cmsghdr)) + (sizeof(long) - 1 )) &~(sizeof(long) - 1)) + (((unsigned long)(sizeof(struct in6_pktinfo)) + (sizeof(long) - 1)) &~(sizeof(long) - 1) )) + |
| 774 | CMSG_SPACE(sizeof(int))((((unsigned long)(sizeof(struct cmsghdr)) + (sizeof(long) - 1 )) &~(sizeof(long) - 1)) + (((unsigned long)(sizeof(int)) + (sizeof(long) - 1)) &~(sizeof(long) - 1))); |
| 775 | |
| 776 | if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL((void *)0)) |
| 777 | errx(1, "malloc"); |
| 778 | rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; |
| 779 | rcvmhdr.msg_controllen = rcvcmsglen; |
| 780 | |
| 781 | /* |
| 782 | * Send UDP or ICMP |
| 783 | */ |
| 784 | if (conf->proto == IPPROTO_ICMP1) { |
| 785 | close(sndsock); |
| 786 | sndsock = rcvsock; |
| 787 | } |
| 788 | |
| 789 | /* |
| 790 | * Source selection |
| 791 | */ |
| 792 | memset(&from6, 0, sizeof(from6)); |
| 793 | if (conf->source) { |
| 794 | memset(&hints, 0, sizeof(hints)); |
| 795 | hints.ai_family = AF_INET624; |
| 796 | hints.ai_socktype = SOCK_DGRAM2; /*dummy*/ |
| 797 | hints.ai_flags = AI_NUMERICHOST4; |
| 798 | if ((error = getaddrinfo(conf->source, "0", &hints, |
| 799 | &res))) |
| 800 | errx(1, "%s: %s", conf->source, |
| 801 | gai_strerror(error)); |
| 802 | memcpy(&from6, res->ai_addr, res->ai_addrlen); |
| 803 | freeaddrinfo(res); |
| 804 | } else { |
| 805 | struct sockaddr_in6 nxt; |
| 806 | int dummy; |
| 807 | |
| 808 | nxt = to6; |
| 809 | nxt.sin6_port = htons(DUMMY_PORT)(__uint16_t)(__builtin_constant_p(10010) ? (__uint16_t)(((__uint16_t )(10010) & 0xffU) << 8 | ((__uint16_t)(10010) & 0xff00U) >> 8) : __swap16md(10010)); |
| 810 | if ((dummy = socket(AF_INET624, SOCK_DGRAM2, 0)) == -1) |
| 811 | err(1, "socket"); |
| 812 | if (conf->rtableid > 0 && |
| 813 | setsockopt(dummy, SOL_SOCKET0xffff, SO_RTABLE0x1021, |
| 814 | &conf->rtableid, sizeof(conf->rtableid)) == -1) |
| 815 | err(1, "setsockopt(SO_RTABLE)"); |
| 816 | if (connect(dummy, (struct sockaddr *)&nxt, |
| 817 | nxt.sin6_len) == -1) |
| 818 | err(1, "connect"); |
| 819 | len = sizeof(from6); |
| 820 | if (getsockname(dummy, (struct sockaddr *)&from6, |
| 821 | &len) == -1) |
| 822 | err(1, "getsockname"); |
| 823 | close(dummy); |
| 824 | } |
| 825 | |
| 826 | from6.sin6_port = htons(0)(__uint16_t)(__builtin_constant_p(0) ? (__uint16_t)(((__uint16_t )(0) & 0xffU) << 8 | ((__uint16_t)(0) & 0xff00U ) >> 8) : __swap16md(0)); |
| 827 | if (bind(sndsock, (struct sockaddr *)&from6, from6.sin6_len) == -1) |
| 828 | err(1, "bind sndsock"); |
| 829 | |
| 830 | if (conf->tflag) { |
| 831 | if (setsockopt(sndsock, IPPROTO_IPV641, IPV6_TCLASS61, |
| 832 | &conf->tos, sizeof(conf->tos)) == -1) |
| 833 | err(6, "IPV6_TCLASS"); |
| 834 | } |
| 835 | |
| 836 | len = sizeof(from6); |
| 837 | if (getsockname(sndsock, (struct sockaddr *)&from6, &len) == -1) |
| 838 | err(1, "getsockname"); |
| 839 | srcport = ntohs(from6.sin6_port)(__uint16_t)(__builtin_constant_p(from6.sin6_port) ? (__uint16_t )(((__uint16_t)(from6.sin6_port) & 0xffU) << 8 | (( __uint16_t)(from6.sin6_port) & 0xff00U) >> 8) : __swap16md (from6.sin6_port)); |
| 840 | break; |
| 841 | default: |
| 842 | errx(1, "unsupported AF: %d", to->sa_family); |
| 843 | break; |
| 844 | } |
| 845 | |
| 846 | if (conf->dflag) { |
| 847 | (void) setsockopt(rcvsock, SOL_SOCKET0xffff, SO_DEBUG0x0001, |
| 848 | &on, sizeof(on)); |
| 849 | (void) setsockopt(sndsock, SOL_SOCKET0xffff, SO_DEBUG0x0001, |
| 850 | &on, sizeof(on)); |
| 851 | } |
| 852 | |
| 853 | if (setsockopt(sndsock, SOL_SOCKET0xffff, SO_SNDBUF0x1001, |
| 854 | &datalen, sizeof(datalen)) == -1) |
| 855 | err(6, "SO_SNDBUF"); |
| 856 | |
| 857 | if (conf->nflag && !conf->Aflag) { |
| 858 | if (pledge("stdio inet", NULL((void *)0)) == -1) |
| 859 | err(1, "pledge"); |
| 860 | } else { |
| 861 | if (pledge("stdio inet dns", NULL((void *)0)) == -1) |
| 862 | err(1, "pledge"); |
| 863 | } |
| 864 | |
| 865 | if (getnameinfo(to, to->sa_len, hbuf, |
| 866 | sizeof(hbuf), NULL((void *)0), 0, NI_NUMERICHOST1)) |
| 867 | strlcpy(hbuf, "(invalid)", sizeof(hbuf)); |
| 868 | fprintf(stderr(&__sF[2]), "%s to %s (%s)", __progname, hostname, hbuf); |
| 869 | if (conf->source) |
| 870 | fprintf(stderr(&__sF[2]), " from %s", conf->source); |
| 871 | fprintf(stderr(&__sF[2]), ", %u hops max, %d byte packets\n", conf->max_ttl, |
| 872 | packetlen); |
| 873 | (void) fflush(stderr(&__sF[2])); |
| 874 | |
| 875 | if (conf->first_ttl > 1) |
| 876 | printf("Skipping %u intermediate hops\n", conf->first_ttl - 1); |
| 877 | |
| 878 | event_init(); |
| 879 | |
| 880 | event_set(&sock_ev, rcvsock, EV_READ0x02 | EV_PERSIST0x10, sock_read, NULL((void *)0)); |
| 881 | event_add(&sock_ev, NULL((void *)0)); |
| 882 | evtimer_set(&timer_ev, send_timer, &timer_ev)event_set(&timer_ev, -1, 0, send_timer, &timer_ev); |
| 883 | evtimer_add(&timer_ev, &tv)event_add(&timer_ev, &tv); |
| 884 | event_dispatch(); |
| 885 | } |
| 886 | |
| 887 | void |
| 888 | usage(void) |
| 889 | { |
| 890 | if (v6flag) { |
| 891 | fprintf(stderr(&__sF[2]), "usage: %s " |
| 892 | "[-ADdIlnSv] [-f first_hop] [-m max_hop] [-p port]\n" |
| 893 | "\t[-q nqueries] [-s sourceaddr] [-t toskeyword] [-V rtable] " |
| 894 | "[-w waittime]\n\thost [datalen]\n", __progname); |
| 895 | } else { |
| 896 | fprintf(stderr(&__sF[2]), |
| 897 | "usage: %s [-ADdIlnSvx] [-f first_ttl] [-g gateway_addr] " |
| 898 | "[-m max_ttl]\n" |
| 899 | "\t[-P proto] [-p port] [-q nqueries] [-s sourceaddr]\n" |
| 900 | "\t[-t toskeyword] " |
| 901 | "[-V rtable] [-w waittime] host [datalen]\n", |
| 902 | __progname); |
| 903 | } |
| 904 | exit(1); |
| 905 | } |
| 906 | |
| 907 | void |
| 908 | sock_read(int fd, short events, void *arg) |
| 909 | { |
| 910 | struct ip *ip; |
| 911 | struct timeval t2, tv = {0, 0}; |
| 912 | int pkg_ok, cc, recv_seq, recv_seq_row; |
| 913 | char hbuf[NI_MAXHOST256]; |
| 914 | |
| 915 | cc = recvmsg(rcvsock, &rcvmhdr, 0); |
| 916 | |
| 917 | if (cc == 0) |
| 918 | return; |
| 919 | |
| 920 | evtimer_add(&timer_ev, &tv)event_add(&timer_ev, &tv); |
| 921 | |
| 922 | gettime(&t2); |
| 923 | |
| 924 | pkg_ok = packet_ok(conf, to->sa_family, &rcvmhdr, cc, &recv_seq); |
| 925 | |
| 926 | /* Skip wrong packet */ |
| 927 | if (pkg_ok == 0) |
| 928 | goto out; |
| 929 | |
| 930 | /* skip corrupt sequence number */ |
| 931 | if (recv_seq < 0 || recv_seq >= conf->max_ttl * conf->nprobes) |
| 932 | goto out; |
| 933 | |
| 934 | recv_seq_row = recv_seq / conf->nprobes; |
| 935 | |
| 936 | /* skipping dup */ |
| 937 | if (tr_results[recv_seq].dup++) |
| 938 | goto out; |
| 939 | |
| 940 | switch (to->sa_family) { |
| 941 | case AF_INET2: |
| 942 | ip = (struct ip *)packet; |
| 943 | |
| 944 | print(conf, from, cc - (ip->ip_hl << 2), inet_ntop(AF_INET2, |
| 945 | &ip->ip_dst, hbuf, sizeof(hbuf)), &tr_results[recv_seq]); |
| 946 | break; |
| 947 | case AF_INET624: |
| 948 | print(conf, from, cc, rcvpktinfo ? inet_ntop(AF_INET624, |
| 949 | &rcvpktinfo->ipi6_addr, hbuf, sizeof(hbuf)) : "?", |
| 950 | &tr_results[recv_seq]); |
| 951 | break; |
| 952 | default: |
| 953 | errx(1, "unsupported AF: %d", to->sa_family); |
| 954 | } |
| 955 | |
| 956 | tr_results[recv_seq].t2 = t2; |
| 957 | tr_results[recv_seq].resp_ttl = v6flag ? rcvhlim : ip->ip_ttl; |
| 958 | |
| 959 | waiting_ttls[recv_seq_row]--; |
| 960 | |
| 961 | if (pkg_ok == -2) { |
| 962 | if ((v6flag && rcvhlim <= 1) || |
| 963 | (!v6flag && ip->ip_ttl <=1)) |
| 964 | snprintf(tr_results[recv_seq].icmp_code, |
| 965 | sizeof(tr_results[recv_seq].icmp_code), "%s", " !"); |
| 966 | tr_results[recv_seq].got_there++; |
| 967 | } else { |
| 968 | if (to->sa_family == AF_INET2 && conf->tflag) |
| 969 | check_tos(ip, &last_tos, &tr_results[recv_seq]); |
| 970 | if (pkg_ok != -1) { |
| 971 | icmp_code(to->sa_family, pkg_ok - 1, |
| 972 | &tr_results[recv_seq].got_there, |
| 973 | &tr_results[recv_seq].unreachable, |
| 974 | &tr_results[recv_seq]); |
| 975 | } |
| 976 | } |
| 977 | |
| 978 | if (cc && ((recv_seq + 1) % conf->nprobes) == 0 && |
| 979 | (conf->xflag || conf->verbose)) |
| 980 | print_exthdr(packet, cc, &tr_results[recv_seq]); |
| 981 | out: |
| 982 | catchup_result_rows(tr_results, conf); |
| 983 | } |
| 984 | |
| 985 | void |
| 986 | send_timer(int fd, short events, void *arg) |
| 987 | { |
| 988 | static int seq; |
| 989 | struct timeval tv = {0, 30000}, t1; |
| 990 | struct event *ev = arg; |
| 991 | int ttl; |
| 992 | |
| 993 | evtimer_add(ev, &tv)event_add(ev, &tv); |
| 994 | |
| 995 | ttl = conf->first_ttl + seq / conf->nprobes; |
| 996 | if (ttl <= conf->max_ttl) { |
| 997 | gettime(&t1); |
| 998 | tr_results[seq].seq = seq; |
| 999 | tr_results[seq].row = seq / conf->nprobes; |
| 1000 | tr_results[seq].ttl = ttl; |
| 1001 | tr_results[seq].t1 = t1; |
| 1002 | send_probe(conf, seq, ttl, to); |
| 1003 | seq++; |
| 1004 | } |
| 1005 | |
| 1006 | catchup_result_rows(tr_results, conf); |
| 1007 | |
| 1008 | } |