Bernhard Reutner-Fischer | dac7ff1 | 2006-04-12 17:55:51 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000 |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 4 | * The Regents of the University of California. All rights reserved. |
| 5 | * |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 6 | * Busybox port by Vladimir Oleynik (C) 2005 <dzo@simtreas.ru> |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 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. |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 23 | */ |
| 24 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 25 | //#define version "1.4a12" |
| 26 | |
| 27 | |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 28 | /* |
| 29 | * traceroute host - trace the route ip packets follow going to "host". |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 30 | * |
| 31 | * Attempt to trace the route an ip packet would follow to some |
| 32 | * internet host. We find out intermediate hops by launching probe |
| 33 | * packets with a small ttl (time to live) then listening for an |
| 34 | * icmp "time exceeded" reply from a gateway. We start our probes |
| 35 | * with a ttl of one and increase by one until we get an icmp "port |
| 36 | * unreachable" (which means we got to "host") or hit a max (which |
| 37 | * defaults to 30 hops & can be changed with the -m flag). Three |
| 38 | * probes (change with -q flag) are sent at each ttl setting and a |
| 39 | * line is printed showing the ttl, address of the gateway and |
| 40 | * round trip time of each probe. If the probe answers come from |
| 41 | * different gateways, the address of each responding system will |
| 42 | * be printed. If there is no response within a 5 sec. timeout |
| 43 | * interval (changed with the -w flag), a "*" is printed for that |
| 44 | * probe. |
| 45 | * |
| 46 | * Probe packets are UDP format. We don't want the destination |
| 47 | * host to process them so the destination port is set to an |
| 48 | * unlikely value (if some clod on the destination is using that |
| 49 | * value, it can be changed with the -p flag). |
| 50 | * |
| 51 | * A sample use might be: |
| 52 | * |
| 53 | * [yak 71]% traceroute nis.nsf.net. |
| 54 | * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet |
| 55 | * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms |
| 56 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms |
| 57 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms |
| 58 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms |
| 59 | * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms |
| 60 | * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms |
| 61 | * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms |
| 62 | * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms |
| 63 | * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms |
| 64 | * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms |
| 65 | * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms |
| 66 | * |
| 67 | * Note that lines 2 & 3 are the same. This is due to a buggy |
| 68 | * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards |
| 69 | * packets with a zero ttl. |
| 70 | * |
| 71 | * A more interesting example is: |
| 72 | * |
| 73 | * [yak 72]% traceroute allspice.lcs.mit.edu. |
| 74 | * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max |
| 75 | * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms |
| 76 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms |
| 77 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms |
| 78 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms |
| 79 | * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms |
| 80 | * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms |
| 81 | * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms |
| 82 | * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms |
| 83 | * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms |
| 84 | * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms |
| 85 | * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms |
| 86 | * 12 * * * |
| 87 | * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms |
| 88 | * 14 * * * |
| 89 | * 15 * * * |
| 90 | * 16 * * * |
| 91 | * 17 * * * |
| 92 | * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms |
| 93 | * |
| 94 | * (I start to see why I'm having so much trouble with mail to |
| 95 | * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away |
| 96 | * either don't send ICMP "time exceeded" messages or send them |
| 97 | * with a ttl too small to reach us. 14 - 17 are running the |
| 98 | * MIT C Gateway code that doesn't send "time exceeded"s. God |
| 99 | * only knows what's going on with 12. |
| 100 | * |
| 101 | * The silent gateway 12 in the above may be the result of a bug in |
| 102 | * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) |
| 103 | * sends an unreachable message using whatever ttl remains in the |
| 104 | * original datagram. Since, for gateways, the remaining ttl is |
| 105 | * zero, the icmp "time exceeded" is guaranteed to not make it back |
| 106 | * to us. The behavior of this bug is slightly more interesting |
| 107 | * when it appears on the destination system: |
| 108 | * |
| 109 | * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms |
| 110 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms |
| 111 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms |
| 112 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms |
| 113 | * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms |
| 114 | * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms |
| 115 | * 7 * * * |
| 116 | * 8 * * * |
| 117 | * 9 * * * |
| 118 | * 10 * * * |
| 119 | * 11 * * * |
| 120 | * 12 * * * |
| 121 | * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! |
| 122 | * |
| 123 | * Notice that there are 12 "gateways" (13 is the final |
| 124 | * destination) and exactly the last half of them are "missing". |
| 125 | * What's really happening is that rip (a Sun-3 running Sun OS3.5) |
| 126 | * is using the ttl from our arriving datagram as the ttl in its |
| 127 | * icmp reply. So, the reply will time out on the return path |
| 128 | * (with no notice sent to anyone since icmp's aren't sent for |
| 129 | * icmp's) until we probe with a ttl that's at least twice the path |
| 130 | * length. I.e., rip is really only 7 hops away. A reply that |
| 131 | * returns with a ttl of 1 is a clue this problem exists. |
| 132 | * Traceroute prints a "!" after the time if the ttl is <= 1. |
| 133 | * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or |
| 134 | * non-standard (HPUX) software, expect to see this problem |
| 135 | * frequently and/or take care picking the target host of your |
| 136 | * probes. |
| 137 | * |
| 138 | * Other possible annotations after the time are !H, !N, !P (got a host, |
| 139 | * network or protocol unreachable, respectively), !S or !F (source |
| 140 | * route failed or fragmentation needed -- neither of these should |
| 141 | * ever occur and the associated gateway is busted if you see one). If |
| 142 | * almost all the probes result in some kind of unreachable, traceroute |
| 143 | * will give up and exit. |
| 144 | * |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 145 | * Notes |
| 146 | * ----- |
| 147 | * This program must be run by root or be setuid. (I suggest that |
| 148 | * you *don't* make it setuid -- casual use could result in a lot |
| 149 | * of unnecessary traffic on our poor, congested nets.) |
| 150 | * |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 151 | * This program requires a kernel mod that does not appear in any |
| 152 | * system available from Berkeley: A raw ip socket using proto |
| 153 | * IPPROTO_RAW must interpret the data sent as an ip datagram (as |
| 154 | * opposed to data to be wrapped in a ip datagram). See the README |
| 155 | * file that came with the source to this program for a description |
| 156 | * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may |
| 157 | * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE |
| 158 | * MODIFIED TO RUN THIS PROGRAM. |
| 159 | * |
| 160 | * The udp port usage may appear bizarre (well, ok, it is bizarre). |
| 161 | * The problem is that an icmp message only contains 8 bytes of |
| 162 | * data from the original datagram. 8 bytes is the size of a udp |
| 163 | * header so, if we want to associate replies with the original |
| 164 | * datagram, the necessary information must be encoded into the |
| 165 | * udp header (the ip id could be used but there's no way to |
| 166 | * interlock with the kernel's assignment of ip id's and, anyway, |
| 167 | * it would have taken a lot more kernel hacking to allow this |
| 168 | * code to set the ip id). So, to allow two or more users to |
| 169 | * use traceroute simultaneously, we use this task's pid as the |
| 170 | * source port (the high bit is set to move the port number out |
| 171 | * of the "likely" range). To keep track of which probe is being |
| 172 | * replied to (so times and/or hop counts don't get confused by a |
| 173 | * reply that was delayed in transit), we increment the destination |
| 174 | * port number before each probe. |
| 175 | * |
| 176 | * Don't use this as a coding example. I was trying to find a |
| 177 | * routing problem and this code sort-of popped out after 48 hours |
| 178 | * without sleep. I was amazed it ever compiled, much less ran. |
| 179 | * |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 180 | * I stole the idea for this program from Steve Deering. Since |
| 181 | * the first release, I've learned that had I attended the right |
| 182 | * IETF working group meetings, I also could have stolen it from Guy |
| 183 | * Almes or Matt Mathis. I don't know (or care) who came up with |
| 184 | * the idea first. I envy the originators' perspicacity and I'm |
| 185 | * glad they didn't keep the idea a secret. |
| 186 | * |
| 187 | * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or |
| 188 | * enhancements to the original distribution. |
| 189 | * |
| 190 | * I've hacked up a round-trip-route version of this that works by |
| 191 | * sending a loose-source-routed udp datagram through the destination |
| 192 | * back to yourself. Unfortunately, SO many gateways botch source |
| 193 | * routing, the thing is almost worthless. Maybe one day... |
| 194 | * |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 195 | * -- Van Jacobson (van@ee.lbl.gov) |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 196 | * Tue Dec 20 03:50:13 PST 1988 |
| 197 | */ |
| 198 | |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 199 | #define TRACEROUTE_SO_DEBUG 0 |
| 200 | |
| 201 | /* TODO: undefs were uncommented - ??! we have config system for that! */ |
| 202 | /* probably ok to remove altogether */ |
| 203 | //#undef CONFIG_FEATURE_TRACEROUTE_VERBOSE |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 204 | //#define CONFIG_FEATURE_TRACEROUTE_VERBOSE |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 205 | //#undef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 206 | //#define CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 207 | //#undef CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 208 | //#define CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 209 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 210 | |
| 211 | #include <net/if.h> |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 212 | #include <arpa/inet.h> |
Denis Vlasenko | 6edadde | 2006-10-03 18:19:02 +0000 | [diff] [blame] | 213 | #include <netinet/in.h> |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 214 | #include <netinet/udp.h> |
| 215 | #include <netinet/ip.h> |
| 216 | #include <netinet/ip_icmp.h> |
| 217 | |
Denis Vlasenko | b6adbf1 | 2007-05-26 19:00:18 +0000 | [diff] [blame] | 218 | #include "libbb.h" |
Denis Vlasenko | 703e202 | 2007-01-22 14:12:08 +0000 | [diff] [blame] | 219 | #include "inet_common.h" |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 220 | |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 221 | |
| 222 | /* |
| 223 | * Definitions for internet protocol version 4. |
| 224 | * Per RFC 791, September 1981. |
| 225 | */ |
Denis Vlasenko | 6edadde | 2006-10-03 18:19:02 +0000 | [diff] [blame] | 226 | #define IPVERSION 4 |
| 227 | |
| 228 | #ifndef IPPROTO_ICMP |
| 229 | /* Grrrr.... */ |
| 230 | #define IPPROTO_ICMP 1 |
| 231 | #endif |
| 232 | #ifndef IPPROTO_IP |
| 233 | #define IPPROTO_IP 0 |
| 234 | #endif |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 235 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 236 | /* |
| 237 | * Overlay for ip header used by other protocols (tcp, udp). |
| 238 | */ |
| 239 | struct ipovly { |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 240 | unsigned char ih_x1[9]; /* (unused) */ |
| 241 | unsigned char ih_pr; /* protocol */ |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 242 | short ih_len; /* protocol length */ |
| 243 | struct in_addr ih_src; /* source internet address */ |
| 244 | struct in_addr ih_dst; /* destination internet address */ |
| 245 | }; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 246 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 247 | /* |
| 248 | * UDP kernel structures and variables. |
| 249 | */ |
Denis Vlasenko | 1094452 | 2007-02-04 02:40:27 +0000 | [diff] [blame] | 250 | struct udpiphdr { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 251 | struct ipovly ui_i; /* overlaid ip structure */ |
| 252 | struct udphdr ui_u; /* udp header */ |
| 253 | }; |
| 254 | #define ui_next ui_i.ih_next |
| 255 | #define ui_prev ui_i.ih_prev |
| 256 | #define ui_x1 ui_i.ih_x1 |
| 257 | #define ui_pr ui_i.ih_pr |
| 258 | #define ui_len ui_i.ih_len |
| 259 | #define ui_src ui_i.ih_src |
| 260 | #define ui_dst ui_i.ih_dst |
| 261 | #define ui_sport ui_u.uh_sport |
| 262 | #define ui_dport ui_u.uh_dport |
| 263 | #define ui_ulen ui_u.uh_ulen |
| 264 | #define ui_sum ui_u.uh_sum |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 265 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 266 | |
| 267 | /* Host name and address list */ |
| 268 | struct hostinfo { |
| 269 | char *name; |
| 270 | int n; |
Denis Vlasenko | 35d4da0 | 2007-01-22 14:04:27 +0000 | [diff] [blame] | 271 | uint32_t *addrs; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 272 | }; |
| 273 | |
| 274 | /* Data section of the probe packet */ |
| 275 | struct outdata { |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 276 | unsigned char seq; /* sequence number of this packet */ |
| 277 | unsigned char ttl; /* ttl packet left with */ |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 278 | // UNUSED. Retaining to have the same packet size. |
| 279 | struct timeval tv_UNUSED ATTRIBUTE_PACKED; /* time packet left */ |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 280 | }; |
| 281 | |
| 282 | struct IFADDRLIST { |
Denis Vlasenko | 35d4da0 | 2007-01-22 14:04:27 +0000 | [diff] [blame] | 283 | uint32_t addr; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 284 | char device[sizeof(struct ifreq)]; |
| 285 | }; |
| 286 | |
| 287 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 288 | static struct ip *outip; /* last output (udp) packet */ |
| 289 | static struct udphdr *outudp; /* last output (udp) packet */ |
| 290 | static struct outdata *outdata; /* last output (udp) packet */ |
| 291 | |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 292 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 293 | static struct icmp *outicmp; /* last output (icmp) packet */ |
| 294 | #endif |
| 295 | |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 296 | static int s; /* receive (icmp) socket file descriptor */ |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 297 | static int sndsock; /* send (udp/icmp) socket file descriptor */ |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 298 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 299 | static int packlen; /* total length of packet */ |
| 300 | static int minpacket; /* min ip packet size */ |
| 301 | static int maxpacket = 32 * 1024; /* max ip packet size */ |
| 302 | static int pmtu; /* Path MTU Discovery (RFC1191) */ |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 303 | |
| 304 | static char *hostname; |
| 305 | |
Denis Vlasenko | 2870301 | 2006-12-19 20:32:02 +0000 | [diff] [blame] | 306 | static uint16_t ident; |
| 307 | static uint16_t port = 32768 + 666; /* start udp dest port # for probe packets */ |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 308 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 309 | static int waittime = 5; /* time to wait for response (in seconds) */ |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 310 | static int doipcksum = 1; /* calculate ip checksums by default */ |
| 311 | |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 312 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 313 | static int optlen; /* length of ip options */ |
| 314 | #else |
| 315 | #define optlen 0 |
| 316 | #endif |
| 317 | |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 318 | |
| 319 | /* Keep in sync with getopt32 call! */ |
| 320 | #define OPT_DONT_FRAGMNT (1<<0) /* F */ |
| 321 | #define OPT_USE_ICMP (1<<1) /* I */ |
| 322 | #define OPT_TTL_FLAG (1<<2) /* l */ |
| 323 | #define OPT_ADDR_NUM (1<<3) /* n */ |
| 324 | #define OPT_BYPASS_ROUTE (1<<4) /* r */ |
| 325 | #define OPT_DEBUG (1<<5) /* d */ |
| 326 | #define OPT_VERBOSE (1<<6) /* v */ |
| 327 | #define OPT_IP_CHKSUM (1<<7) /* x */ |
| 328 | #define OPT_TOS (1<<8) /* t */ |
| 329 | #define OPT_DEVICE (1<<9) /* i */ |
| 330 | #define OPT_MAX_TTL (1<<10) /* m */ |
| 331 | #define OPT_PORT (1<<11) /* p */ |
| 332 | #define OPT_NPROBES (1<<12) /* q */ |
| 333 | #define OPT_SOURCE (1<<13) /* s */ |
| 334 | #define OPT_WAITTIME (1<<14) /* w */ |
| 335 | #define OPT_PAUSE_MS (1<<15) /* z */ |
| 336 | #define OPT_FIRST_TTL (1<<16) /* f */ |
| 337 | |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 338 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 339 | /* use icmp echo instead of udp packets */ |
| 340 | #define useicmp (option_mask32 & OPT_USE_ICMP) |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 341 | #endif |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 342 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 343 | #define verbose (option_mask32 & OPT_VERBOSE) |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 344 | #endif |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 345 | #define nflag (option_mask32 & OPT_ADDR_NUM) |
| 346 | |
| 347 | |
| 348 | struct globals { |
| 349 | /* last inbound (icmp) packet */ |
| 350 | unsigned char packet[512]; |
| 351 | struct sockaddr_storage whereto; /* Who to try to reach */ |
| 352 | struct sockaddr_storage wherefrom; /* Who we are */ |
| 353 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| 354 | /* Maximum number of gateways (include room for one noop) */ |
| 355 | #define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(uint32_t))) |
| 356 | /* loose source route gateway list (including room for final destination) */ |
| 357 | uint32_t gwlist[NGATEWAYS + 1]; |
| 358 | #endif |
| 359 | }; |
| 360 | |
| 361 | #define G (*ptr_to_globals) |
| 362 | |
| 363 | #define packet (G.packet ) |
| 364 | #define whereto (G.whereto ) |
| 365 | #define wherefrom (G.wherefrom) |
| 366 | #define gwlist (G.gwlist ) |
| 367 | |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 368 | |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 369 | /* |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 370 | * Return the interface list |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 371 | */ |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 372 | static int |
| 373 | ifaddrlist(struct IFADDRLIST **ipaddrp) |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 374 | { |
Denis Vlasenko | e8a0788 | 2007-06-10 15:08:44 +0000 | [diff] [blame] | 375 | enum { IFREQ_BUFSIZE = (32 * 1024) / sizeof(struct ifreq) }; |
| 376 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 377 | int fd, nipaddr; |
| 378 | #ifdef HAVE_SOCKADDR_SA_LEN |
| 379 | int n; |
| 380 | #endif |
| 381 | struct ifreq *ifrp, *ifend, *ifnext; |
| 382 | struct sockaddr_in *addr_sin; |
| 383 | struct IFADDRLIST *al; |
| 384 | struct ifconf ifc; |
Denis Vlasenko | e8a0788 | 2007-06-10 15:08:44 +0000 | [diff] [blame] | 385 | struct ifreq ifr; |
| 386 | /* Was on stack, but 32k is a bit too much: */ |
| 387 | struct ifreq *ibuf = xmalloc(IFREQ_BUFSIZE * sizeof(ibuf[0])); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 388 | struct IFADDRLIST *st_ifaddrlist; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 389 | |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 390 | fd = xsocket(AF_INET, SOCK_DGRAM, 0); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 391 | |
Denis Vlasenko | e8a0788 | 2007-06-10 15:08:44 +0000 | [diff] [blame] | 392 | ifc.ifc_len = IFREQ_BUFSIZE * sizeof(ibuf[0]); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 393 | ifc.ifc_buf = (caddr_t)ibuf; |
| 394 | |
Denis Vlasenko | e8a0788 | 2007-06-10 15:08:44 +0000 | [diff] [blame] | 395 | if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 |
| 396 | || ifc.ifc_len < sizeof(struct ifreq) |
| 397 | ) { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 398 | if (errno == EINVAL) |
| 399 | bb_error_msg_and_die( |
Denis Vlasenko | c965f4b | 2007-06-27 00:20:38 +0000 | [diff] [blame] | 400 | "SIOCGIFCONF: ifreq struct too small (%u bytes)", |
| 401 | (unsigned)(IFREQ_BUFSIZE * sizeof(ibuf[0]))); |
Denis Vlasenko | e8a0788 | 2007-06-10 15:08:44 +0000 | [diff] [blame] | 402 | bb_perror_msg_and_die("SIOCGIFCONF"); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 403 | } |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 404 | ifrp = ibuf; |
| 405 | ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len); |
| 406 | |
| 407 | nipaddr = 1 + (ifc.ifc_len / sizeof(struct ifreq)); |
Rob Landley | 081e384 | 2006-08-03 20:07:35 +0000 | [diff] [blame] | 408 | st_ifaddrlist = xzalloc(nipaddr * sizeof(struct IFADDRLIST)); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 409 | al = st_ifaddrlist; |
| 410 | nipaddr = 0; |
| 411 | |
| 412 | for (; ifrp < ifend; ifrp = ifnext) { |
| 413 | #ifdef HAVE_SOCKADDR_SA_LEN |
| 414 | n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name); |
| 415 | if (n < sizeof(*ifrp)) |
| 416 | ifnext = ifrp + 1; |
| 417 | else |
| 418 | ifnext = (struct ifreq *)((char *)ifrp + n); |
| 419 | if (ifrp->ifr_addr.sa_family != AF_INET) |
| 420 | continue; |
| 421 | #else |
| 422 | ifnext = ifrp + 1; |
| 423 | #endif |
| 424 | /* |
| 425 | * Need a template to preserve address info that is |
| 426 | * used below to locate the next entry. (Otherwise, |
| 427 | * SIOCGIFFLAGS stomps over it because the requests |
| 428 | * are returned in a union.) |
| 429 | */ |
| 430 | strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name)); |
| 431 | if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) { |
| 432 | if (errno == ENXIO) |
| 433 | continue; |
| 434 | bb_perror_msg_and_die("SIOCGIFFLAGS: %.*s", |
| 435 | (int)sizeof(ifr.ifr_name), ifr.ifr_name); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 436 | } |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 437 | |
| 438 | /* Must be up */ |
| 439 | if ((ifr.ifr_flags & IFF_UP) == 0) |
| 440 | continue; |
| 441 | |
| 442 | safe_strncpy(al->device, ifr.ifr_name, sizeof(ifr.ifr_name) + 1); |
| 443 | #ifdef sun |
| 444 | /* Ignore sun virtual interfaces */ |
| 445 | if (strchr(al->device, ':') != NULL) |
| 446 | continue; |
| 447 | #endif |
Denis Vlasenko | fb79a2e | 2007-07-14 22:07:14 +0000 | [diff] [blame] | 448 | ioctl_or_perror_and_die(fd, SIOCGIFADDR, (char *)&ifr, |
| 449 | "SIOCGIFADDR: %s", al->device); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 450 | |
| 451 | addr_sin = (struct sockaddr_in *)&ifr.ifr_addr; |
| 452 | al->addr = addr_sin->sin_addr.s_addr; |
| 453 | ++al; |
| 454 | ++nipaddr; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 455 | } |
Denis Vlasenko | 1385899 | 2006-10-08 12:49:22 +0000 | [diff] [blame] | 456 | if (nipaddr == 0) |
Denis Vlasenko | e8a0788 | 2007-06-10 15:08:44 +0000 | [diff] [blame] | 457 | bb_error_msg_and_die("can't find any network interfaces"); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 458 | |
Denis Vlasenko | e8a0788 | 2007-06-10 15:08:44 +0000 | [diff] [blame] | 459 | free(ibuf); |
| 460 | close(fd); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 461 | *ipaddrp = st_ifaddrlist; |
| 462 | return nipaddr; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 463 | } |
| 464 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 465 | |
| 466 | static void |
Denis Vlasenko | 35d4da0 | 2007-01-22 14:04:27 +0000 | [diff] [blame] | 467 | setsin(struct sockaddr_in *addr_sin, uint32_t addr) |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 468 | { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 469 | memset(addr_sin, 0, sizeof(*addr_sin)); |
| 470 | #ifdef HAVE_SOCKADDR_SA_LEN |
| 471 | addr_sin->sin_len = sizeof(*addr_sin); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 472 | #endif |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 473 | addr_sin->sin_family = AF_INET; |
| 474 | addr_sin->sin_addr.s_addr = addr; |
| 475 | } |
| 476 | |
| 477 | |
| 478 | /* |
| 479 | * Return the source address for the given destination address |
| 480 | */ |
| 481 | static void |
| 482 | findsaddr(const struct sockaddr_in *to, struct sockaddr_in *from) |
| 483 | { |
| 484 | int i, n; |
| 485 | FILE *f; |
Denis Vlasenko | 35d4da0 | 2007-01-22 14:04:27 +0000 | [diff] [blame] | 486 | uint32_t mask; |
| 487 | uint32_t dest, tmask; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 488 | struct IFADDRLIST *al; |
| 489 | char buf[256], tdevice[256], device[256]; |
| 490 | |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 491 | f = xfopen("/proc/net/route", "r"); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 492 | |
| 493 | /* Find the appropriate interface */ |
| 494 | n = 0; |
| 495 | mask = 0; |
| 496 | device[0] = '\0'; |
| 497 | while (fgets(buf, sizeof(buf), f) != NULL) { |
| 498 | ++n; |
| 499 | if (n == 1 && strncmp(buf, "Iface", 5) == 0) |
| 500 | continue; |
Denis Vlasenko | e8a0788 | 2007-06-10 15:08:44 +0000 | [diff] [blame] | 501 | i = sscanf(buf, "%255s %x %*s %*s %*s %*s %*s %x", |
| 502 | tdevice, &dest, &tmask); |
| 503 | if (i != 3) |
| 504 | bb_error_msg_and_die("junk in buffer"); |
| 505 | if ((to->sin_addr.s_addr & tmask) == dest |
| 506 | && (tmask > mask || mask == 0) |
| 507 | ) { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 508 | mask = tmask; |
| 509 | strcpy(device, tdevice); |
| 510 | } |
| 511 | } |
| 512 | fclose(f); |
| 513 | |
| 514 | if (device[0] == '\0') |
Denis Vlasenko | e8a0788 | 2007-06-10 15:08:44 +0000 | [diff] [blame] | 515 | bb_error_msg_and_die("can't find interface"); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 516 | |
| 517 | /* Get the interface address list */ |
| 518 | n = ifaddrlist(&al); |
| 519 | |
| 520 | /* Find our appropriate source address */ |
| 521 | for (i = n; i > 0; --i, ++al) |
| 522 | if (strcmp(device, al->device) == 0) |
| 523 | break; |
| 524 | if (i <= 0) |
Denis Vlasenko | ea62077 | 2006-10-14 02:23:43 +0000 | [diff] [blame] | 525 | bb_error_msg_and_die("can't find interface %s", device); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 526 | |
| 527 | setsin(from, al->addr); |
| 528 | } |
| 529 | |
| 530 | /* |
| 531 | "Usage: %s [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]\n" |
| 532 | "\t[-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]\n" |
| 533 | "\t[-w waittime] [-z pausemsecs] host [packetlen]" |
| 534 | |
| 535 | */ |
| 536 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 537 | static int |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 538 | wait_for_reply(int sock, struct sockaddr_in *fromp) |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 539 | { |
| 540 | fd_set fds; |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 541 | struct timeval tvwait; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 542 | int cc = 0; |
| 543 | socklen_t fromlen = sizeof(*fromp); |
| 544 | |
| 545 | FD_ZERO(&fds); |
| 546 | FD_SET(sock, &fds); |
| 547 | |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 548 | tvwait.tv_sec = waittime; |
| 549 | tvwait.tv_usec = 0; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 550 | |
Rob Landley | c9c1a41 | 2006-07-12 19:17:55 +0000 | [diff] [blame] | 551 | if (select(sock + 1, &fds, NULL, NULL, &tvwait) > 0) |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 552 | cc = recvfrom(sock, (char *)packet, sizeof(packet), 0, |
| 553 | (struct sockaddr *)fromp, &fromlen); |
| 554 | |
| 555 | return cc; |
| 556 | } |
| 557 | |
| 558 | /* |
| 559 | * Checksum routine for Internet Protocol family headers (C Version) |
| 560 | */ |
Denis Vlasenko | 2870301 | 2006-12-19 20:32:02 +0000 | [diff] [blame] | 561 | static uint16_t |
| 562 | in_cksum(uint16_t *addr, int len) |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 563 | { |
| 564 | int nleft = len; |
Denis Vlasenko | 2870301 | 2006-12-19 20:32:02 +0000 | [diff] [blame] | 565 | uint16_t *w = addr; |
| 566 | uint16_t answer; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 567 | int sum = 0; |
| 568 | |
| 569 | /* |
| 570 | * Our algorithm is simple, using a 32 bit accumulator (sum), |
| 571 | * we add sequential 16 bit words to it, and at the end, fold |
| 572 | * back all the carry bits from the top 16 bits into the lower |
| 573 | * 16 bits. |
| 574 | */ |
| 575 | while (nleft > 1) { |
| 576 | sum += *w++; |
| 577 | nleft -= 2; |
| 578 | } |
| 579 | |
| 580 | /* mop up an odd byte, if necessary */ |
| 581 | if (nleft == 1) |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 582 | sum += *(unsigned char *)w; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 583 | |
| 584 | /* |
| 585 | * add back carry outs from top 16 bits to low 16 bits |
| 586 | */ |
| 587 | sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ |
| 588 | sum += (sum >> 16); /* add carry */ |
| 589 | answer = ~sum; /* truncate to 16 bits */ |
| 590 | return answer; |
| 591 | } |
| 592 | |
| 593 | |
| 594 | static void |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 595 | send_probe(int seq, int ttl) |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 596 | { |
| 597 | int cc; |
| 598 | struct udpiphdr *ui, *oui; |
| 599 | struct ip tip; |
| 600 | |
| 601 | outip->ip_ttl = ttl; |
| 602 | outip->ip_id = htons(ident + seq); |
| 603 | |
| 604 | /* |
| 605 | * In most cases, the kernel will recalculate the ip checksum. |
| 606 | * But we must do it anyway so that the udp checksum comes out |
| 607 | * right. |
| 608 | */ |
| 609 | if (doipcksum) { |
| 610 | outip->ip_sum = |
Denis Vlasenko | 2870301 | 2006-12-19 20:32:02 +0000 | [diff] [blame] | 611 | in_cksum((uint16_t *)outip, sizeof(*outip) + optlen); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 612 | if (outip->ip_sum == 0) |
| 613 | outip->ip_sum = 0xffff; |
| 614 | } |
| 615 | |
| 616 | /* Payload */ |
| 617 | outdata->seq = seq; |
| 618 | outdata->ttl = ttl; |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 619 | // UNUSED: was storing gettimeofday's result there, but never ever checked it |
| 620 | /*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/ |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 621 | |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 622 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 623 | if (useicmp) |
| 624 | outicmp->icmp_seq = htons(seq); |
| 625 | else |
| 626 | #endif |
| 627 | outudp->dest = htons(port + seq); |
| 628 | |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 629 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 630 | if (useicmp) { |
| 631 | /* Always calculate checksum for icmp packets */ |
| 632 | outicmp->icmp_cksum = 0; |
Denis Vlasenko | 2870301 | 2006-12-19 20:32:02 +0000 | [diff] [blame] | 633 | outicmp->icmp_cksum = in_cksum((uint16_t *)outicmp, |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 634 | packlen - (sizeof(*outip) + optlen)); |
| 635 | if (outicmp->icmp_cksum == 0) |
| 636 | outicmp->icmp_cksum = 0xffff; |
| 637 | } else |
| 638 | #endif |
Denis Vlasenko | 9275814 | 2006-10-03 19:56:34 +0000 | [diff] [blame] | 639 | if (doipcksum) { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 640 | /* Checksum (we must save and restore ip header) */ |
| 641 | tip = *outip; |
| 642 | ui = (struct udpiphdr *)outip; |
| 643 | oui = (struct udpiphdr *)&tip; |
| 644 | /* Easier to zero and put back things that are ok */ |
| 645 | memset((char *)ui, 0, sizeof(ui->ui_i)); |
| 646 | ui->ui_src = oui->ui_src; |
| 647 | ui->ui_dst = oui->ui_dst; |
| 648 | ui->ui_pr = oui->ui_pr; |
| 649 | ui->ui_len = outudp->len; |
| 650 | outudp->check = 0; |
Denis Vlasenko | 2870301 | 2006-12-19 20:32:02 +0000 | [diff] [blame] | 651 | outudp->check = in_cksum((uint16_t *)ui, packlen); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 652 | if (outudp->check == 0) |
| 653 | outudp->check = 0xffff; |
| 654 | *outip = tip; |
| 655 | } |
| 656 | |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 657 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 658 | /* XXX undocumented debugging hack */ |
| 659 | if (verbose > 1) { |
Denis Vlasenko | 2870301 | 2006-12-19 20:32:02 +0000 | [diff] [blame] | 660 | const uint16_t *sp; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 661 | int nshorts, i; |
| 662 | |
Denis Vlasenko | 2870301 | 2006-12-19 20:32:02 +0000 | [diff] [blame] | 663 | sp = (uint16_t *)outip; |
Denis Vlasenko | 35d4da0 | 2007-01-22 14:04:27 +0000 | [diff] [blame] | 664 | nshorts = (unsigned)packlen / sizeof(uint16_t); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 665 | i = 0; |
| 666 | printf("[ %d bytes", packlen); |
| 667 | while (--nshorts >= 0) { |
| 668 | if ((i++ % 8) == 0) |
| 669 | printf("\n\t"); |
| 670 | printf(" %04x", ntohs(*sp)); |
| 671 | sp++; |
| 672 | } |
| 673 | if (packlen & 1) { |
| 674 | if ((i % 8) == 0) |
| 675 | printf("\n\t"); |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 676 | printf(" %02x", *(unsigned char *)sp); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 677 | } |
| 678 | printf("]\n"); |
| 679 | } |
| 680 | #endif |
| 681 | |
| 682 | #if !defined(IP_HDRINCL) && defined(IP_TTL) |
| 683 | if (setsockopt(sndsock, IPPROTO_IP, IP_TTL, |
| 684 | (char *)&ttl, sizeof(ttl)) < 0) { |
| 685 | bb_perror_msg_and_die("setsockopt ttl %d", ttl); |
| 686 | } |
| 687 | #endif |
| 688 | |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 689 | cc = xsendto(sndsock, (char *)outip, |
| 690 | packlen, (struct sockaddr *)&whereto, sizeof(whereto)); |
| 691 | if (cc != packlen) { |
| 692 | bb_info_msg("wrote %s %d chars, ret=%d", hostname, packlen, cc); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 693 | } |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 694 | } |
| 695 | |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 696 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 697 | /* |
| 698 | * Convert an ICMP "type" field to a printable string. |
| 699 | */ |
| 700 | static inline const char * |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 701 | pr_type(unsigned char t) |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 702 | { |
Denis Vlasenko | 6ca409e | 2007-08-12 20:58:27 +0000 | [diff] [blame^] | 703 | static const char *const ttab[] = { |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 704 | "Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable", |
| 705 | "Source Quench", "Redirect", "ICMP 6", "ICMP 7", |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 706 | "Echo", "Router Advert", "Router Solicit", "Time Exceeded", |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 707 | "Param Problem", "Timestamp", "Timestamp Reply", "Info Request", |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 708 | "Info Reply", "Mask Request", "Mask Reply" |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 709 | }; |
| 710 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 711 | if (t > 18) |
| 712 | return "OUT-OF-RANGE"; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 713 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 714 | return ttab[t]; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 715 | } |
| 716 | #endif |
| 717 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 718 | static int |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 719 | packet_ok(unsigned char *buf, int cc, struct sockaddr_in *from, int seq) |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 720 | { |
| 721 | struct icmp *icp; |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 722 | unsigned char type, code; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 723 | int hlen; |
| 724 | struct ip *ip; |
| 725 | |
| 726 | ip = (struct ip *) buf; |
| 727 | hlen = ip->ip_hl << 2; |
| 728 | if (cc < hlen + ICMP_MINLEN) { |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 729 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 730 | if (verbose) |
| 731 | printf("packet too short (%d bytes) from %s\n", cc, |
| 732 | inet_ntoa(from->sin_addr)); |
| 733 | #endif |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 734 | return 0; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 735 | } |
| 736 | cc -= hlen; |
| 737 | icp = (struct icmp *)(buf + hlen); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 738 | type = icp->icmp_type; |
| 739 | code = icp->icmp_code; |
| 740 | /* Path MTU Discovery (RFC1191) */ |
| 741 | if (code != ICMP_UNREACH_NEEDFRAG) |
| 742 | pmtu = 0; |
| 743 | else { |
| 744 | pmtu = ntohs(icp->icmp_nextmtu); |
| 745 | } |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 746 | if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) || |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 747 | type == ICMP_UNREACH || type == ICMP_ECHOREPLY) { |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 748 | struct ip *hip; |
| 749 | struct udphdr *up; |
| 750 | |
| 751 | hip = &icp->icmp_ip; |
| 752 | hlen = hip->ip_hl << 2; |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 753 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 754 | if (useicmp) { |
| 755 | struct icmp *hicmp; |
| 756 | |
| 757 | /* XXX */ |
| 758 | if (type == ICMP_ECHOREPLY && |
| 759 | icp->icmp_id == htons(ident) && |
| 760 | icp->icmp_seq == htons(seq)) |
| 761 | return -2; |
| 762 | |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 763 | hicmp = (struct icmp *)((unsigned char *)hip + hlen); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 764 | /* XXX 8 is a magic number */ |
| 765 | if (hlen + 8 <= cc && |
| 766 | hip->ip_p == IPPROTO_ICMP && |
| 767 | hicmp->icmp_id == htons(ident) && |
| 768 | hicmp->icmp_seq == htons(seq)) |
| 769 | return (type == ICMP_TIMXCEED ? -1 : code + 1); |
| 770 | } else |
| 771 | #endif |
Denis Vlasenko | 9275814 | 2006-10-03 19:56:34 +0000 | [diff] [blame] | 772 | { |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 773 | up = (struct udphdr *)((unsigned char *)hip + hlen); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 774 | /* XXX 8 is a magic number */ |
| 775 | if (hlen + 12 <= cc && |
| 776 | hip->ip_p == IPPROTO_UDP && |
| 777 | up->source == htons(ident) && |
| 778 | up->dest == htons(port + seq)) |
| 779 | return (type == ICMP_TIMXCEED ? -1 : code + 1); |
| 780 | } |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 781 | } |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 782 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 783 | if (verbose) { |
| 784 | int i; |
Denis Vlasenko | 35d4da0 | 2007-01-22 14:04:27 +0000 | [diff] [blame] | 785 | uint32_t *lp = (uint32_t *)&icp->icmp_ip; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 786 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 787 | printf("\n%d bytes from %s to " |
| 788 | "%s: icmp type %d (%s) code %d\n", |
| 789 | cc, inet_ntoa(from->sin_addr), |
| 790 | inet_ntoa(ip->ip_dst), type, pr_type(type), icp->icmp_code); |
Denis Vlasenko | e8a0788 | 2007-06-10 15:08:44 +0000 | [diff] [blame] | 791 | for (i = 4; i < cc; i += sizeof(*lp)) |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 792 | printf("%2d: x%8.8x\n", i, *lp++); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 793 | } |
| 794 | #endif |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 795 | return 0; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 796 | } |
| 797 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 798 | |
| 799 | /* |
| 800 | * Construct an Internet address representation. |
| 801 | * If the nflag has been supplied, give |
| 802 | * numeric value, otherwise try for symbolic name. |
| 803 | */ |
| 804 | static inline void |
Denis Vlasenko | 6d9ea24 | 2007-06-19 11:12:46 +0000 | [diff] [blame] | 805 | print_inetname(struct sockaddr_in *from) |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 806 | { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 807 | const char *ina; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 808 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 809 | ina = inet_ntoa(from->sin_addr); |
| 810 | if (nflag) |
| 811 | printf(" %s", ina); |
Denis Vlasenko | 6d9ea24 | 2007-06-19 11:12:46 +0000 | [diff] [blame] | 812 | else { |
| 813 | char *n = NULL; |
| 814 | if (from->sin_addr.s_addr != INADDR_ANY) |
| 815 | n = xmalloc_sockaddr2host_noport((struct sockaddr*)from, sizeof(*from)); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 816 | printf(" %s (%s)", (n ? n : ina), ina); |
Denis Vlasenko | 6d9ea24 | 2007-06-19 11:12:46 +0000 | [diff] [blame] | 817 | free(n); |
| 818 | } |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 819 | } |
| 820 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 821 | static inline void |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 822 | print(unsigned char *buf, int cc, struct sockaddr_in *from) |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 823 | { |
| 824 | struct ip *ip; |
| 825 | int hlen; |
| 826 | |
| 827 | ip = (struct ip *) buf; |
| 828 | hlen = ip->ip_hl << 2; |
| 829 | cc -= hlen; |
| 830 | |
Denis Vlasenko | 6d9ea24 | 2007-06-19 11:12:46 +0000 | [diff] [blame] | 831 | print_inetname(from); |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 832 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 833 | if (verbose) |
Denis Vlasenko | 6398cf4 | 2007-04-11 17:04:29 +0000 | [diff] [blame] | 834 | printf(" %d bytes to %s", cc, inet_ntoa(ip->ip_dst)); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 835 | #endif |
| 836 | } |
| 837 | |
| 838 | |
| 839 | static struct hostinfo * |
| 840 | gethostinfo(const char *host) |
| 841 | { |
| 842 | int n; |
| 843 | struct hostent *hp; |
| 844 | struct hostinfo *hi; |
| 845 | char **p; |
Denis Vlasenko | 35d4da0 | 2007-01-22 14:04:27 +0000 | [diff] [blame] | 846 | uint32_t addr, *ap; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 847 | |
Rob Landley | 081e384 | 2006-08-03 20:07:35 +0000 | [diff] [blame] | 848 | hi = xzalloc(sizeof(*hi)); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 849 | addr = inet_addr(host); |
Denis Vlasenko | 703e202 | 2007-01-22 14:12:08 +0000 | [diff] [blame] | 850 | if (addr != 0xffffffff) { |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 851 | hi->name = xstrdup(host); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 852 | hi->n = 1; |
Rob Landley | 081e384 | 2006-08-03 20:07:35 +0000 | [diff] [blame] | 853 | hi->addrs = xzalloc(sizeof(hi->addrs[0])); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 854 | hi->addrs[0] = addr; |
| 855 | return hi; |
| 856 | } |
| 857 | |
| 858 | hp = xgethostbyname(host); |
| 859 | if (hp->h_addrtype != AF_INET || hp->h_length != 4) |
| 860 | bb_perror_msg_and_die("bad host %s", host); |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 861 | hi->name = xstrdup(hp->h_name); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 862 | for (n = 0, p = hp->h_addr_list; *p != NULL; ++n, ++p) |
| 863 | continue; |
| 864 | hi->n = n; |
Rob Landley | 081e384 | 2006-08-03 20:07:35 +0000 | [diff] [blame] | 865 | hi->addrs = xzalloc(n * sizeof(hi->addrs[0])); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 866 | for (ap = hi->addrs, p = hp->h_addr_list; *p != NULL; ++ap, ++p) |
| 867 | memcpy(ap, *p, sizeof(*ap)); |
| 868 | return hi; |
| 869 | } |
| 870 | |
| 871 | static void |
| 872 | freehostinfo(struct hostinfo *hi) |
| 873 | { |
Rob Landley | e7c43b6 | 2006-03-01 16:39:45 +0000 | [diff] [blame] | 874 | free(hi->name); |
Denis Vlasenko | 1adf681 | 2007-06-14 07:47:52 +0000 | [diff] [blame] | 875 | free(hi->addrs); |
| 876 | free(hi); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 877 | } |
| 878 | |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 879 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 880 | static void |
Denis Vlasenko | 35d4da0 | 2007-01-22 14:04:27 +0000 | [diff] [blame] | 881 | getaddr(uint32_t *ap, const char *host) |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 882 | { |
| 883 | struct hostinfo *hi; |
| 884 | |
| 885 | hi = gethostinfo(host); |
| 886 | *ap = hi->addrs[0]; |
| 887 | freehostinfo(hi); |
| 888 | } |
| 889 | #endif |
| 890 | |
Denis Vlasenko | 1adf681 | 2007-06-14 07:47:52 +0000 | [diff] [blame] | 891 | static void |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 892 | print_delta_ms(unsigned t1p, unsigned t2p) |
Denis Vlasenko | 1adf681 | 2007-06-14 07:47:52 +0000 | [diff] [blame] | 893 | { |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 894 | unsigned tt = t2p - t1p; |
Denis Vlasenko | 1adf681 | 2007-06-14 07:47:52 +0000 | [diff] [blame] | 895 | printf(" %u.%03u ms", tt/1000, tt%1000); |
| 896 | } |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 897 | |
Bernhard Reutner-Fischer | febe3c4 | 2007-04-04 20:52:03 +0000 | [diff] [blame] | 898 | int traceroute_main(int argc, char **argv); |
| 899 | int traceroute_main(int argc, char **argv) |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 900 | { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 901 | int code, n; |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 902 | unsigned char *outp; |
Denis Vlasenko | 35d4da0 | 2007-01-22 14:04:27 +0000 | [diff] [blame] | 903 | uint32_t *ap; |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 904 | struct sockaddr_in *from; |
| 905 | struct sockaddr_in *to; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 906 | struct hostinfo *hi; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 907 | int ttl, probe, i; |
| 908 | int seq = 0; |
| 909 | int tos = 0; |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 910 | char *tos_str; |
| 911 | char *source; |
| 912 | unsigned op; |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 913 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 914 | int lsrr = 0; |
| 915 | #endif |
Denis Vlasenko | 2870301 | 2006-12-19 20:32:02 +0000 | [diff] [blame] | 916 | uint16_t off = 0; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 917 | struct IFADDRLIST *al; |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 918 | char *device; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 919 | int max_ttl = 30; |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 920 | char *max_ttl_str; |
| 921 | char *port_str; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 922 | int nprobes = 3; |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 923 | char *nprobes_str; |
| 924 | char *waittime_str; |
Denis Vlasenko | 35d4da0 | 2007-01-22 14:04:27 +0000 | [diff] [blame] | 925 | unsigned pausemsecs = 0; |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 926 | char *pausemsecs_str; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 927 | int first_ttl = 1; |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 928 | char *first_ttl_str; |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 929 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
Denis Vlasenko | f7fcca4 | 2007-04-13 22:07:21 +0000 | [diff] [blame] | 930 | llist_t *source_route_list = NULL; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 931 | #endif |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 932 | |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 933 | PTR_TO_GLOBALS = xzalloc(sizeof(G)); |
| 934 | from = (struct sockaddr_in *)&wherefrom; |
| 935 | to = (struct sockaddr_in *)&whereto; |
| 936 | |
| 937 | //opterr = 0; |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 938 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
Denis Vlasenko | 67b23e6 | 2006-10-03 21:00:06 +0000 | [diff] [blame] | 939 | opt_complementary = "x-x:g::"; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 940 | #else |
Denis Vlasenko | 67b23e6 | 2006-10-03 21:00:06 +0000 | [diff] [blame] | 941 | opt_complementary = "x-x"; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 942 | #endif |
| 943 | |
Denis Vlasenko | 67b23e6 | 2006-10-03 21:00:06 +0000 | [diff] [blame] | 944 | op = getopt32(argc, argv, "FIlnrdvxt:i:m:p:q:s:w:z:f:" |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 945 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 946 | "g:" |
| 947 | #endif |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 948 | , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str |
| 949 | , &source, &waittime_str, &pausemsecs_str, &first_ttl_str |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 950 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
Denis Vlasenko | f7fcca4 | 2007-04-13 22:07:21 +0000 | [diff] [blame] | 951 | , &source_route_list |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 952 | #endif |
| 953 | ); |
| 954 | |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 955 | if (op & OPT_DONT_FRAGMNT) |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 956 | off = IP_DF; |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 957 | if (op & OPT_IP_CHKSUM) { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 958 | doipcksum = 0; |
Denis Vlasenko | 1385899 | 2006-10-08 12:49:22 +0000 | [diff] [blame] | 959 | bb_error_msg("warning: ip checksums disabled"); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 960 | } |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 961 | if (op & OPT_TOS) |
| 962 | tos = xatou_range(tos_str, 0, 255); |
| 963 | if (op & OPT_MAX_TTL) |
| 964 | max_ttl = xatou_range(max_ttl_str, 1, 255); |
| 965 | if (op & OPT_PORT) |
Denis Vlasenko | 1385899 | 2006-10-08 12:49:22 +0000 | [diff] [blame] | 966 | port = xatou16(port_str); |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 967 | if (op & OPT_NPROBES) |
| 968 | nprobes = xatou_range(nprobes_str, 1, INT_MAX); |
| 969 | if (op & OPT_SOURCE) { |
Denis Vlasenko | 9275814 | 2006-10-03 19:56:34 +0000 | [diff] [blame] | 970 | /* |
| 971 | * set the ip source address of the outbound |
| 972 | * probe (e.g., on a multi-homed host). |
| 973 | */ |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 974 | if (getuid()) |
| 975 | bb_error_msg_and_die("-s %s: permission denied", source); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 976 | } |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 977 | if (op & OPT_WAITTIME) |
| 978 | waittime = xatou_range(waittime_str, 2, 24 * 60 * 60); |
| 979 | if (op & OPT_PAUSE_MS) |
| 980 | pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000); |
| 981 | if (op & OPT_FIRST_TTL) |
| 982 | first_ttl = xatou_range(first_ttl_str, 1, 255); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 983 | |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 984 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
Denis Vlasenko | f7fcca4 | 2007-04-13 22:07:21 +0000 | [diff] [blame] | 985 | if (source_route_list) { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 986 | llist_t *l_sr; |
| 987 | |
Denis Vlasenko | f7fcca4 | 2007-04-13 22:07:21 +0000 | [diff] [blame] | 988 | l_sr = source_route_list; |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 989 | while (l_sr) { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 990 | if (lsrr >= NGATEWAYS) |
Denis Vlasenko | 9275814 | 2006-10-03 19:56:34 +0000 | [diff] [blame] | 991 | bb_error_msg_and_die("no more than %d gateways", NGATEWAYS); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 992 | getaddr(gwlist + lsrr, l_sr->data); |
| 993 | ++lsrr; |
| 994 | l_sr = l_sr->link; |
Denis Vlasenko | f7fcca4 | 2007-04-13 22:07:21 +0000 | [diff] [blame] | 995 | free(source_route_list); |
| 996 | source_route_list = l_sr; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 997 | } |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 998 | optlen = (lsrr + 1) * sizeof(gwlist[0]); |
| 999 | } |
| 1000 | #endif |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1001 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1002 | if (first_ttl > max_ttl) { |
| 1003 | bb_error_msg_and_die( |
| 1004 | "first ttl (%d) may not be greater than max ttl (%d)", |
| 1005 | first_ttl, max_ttl); |
| 1006 | } |
| 1007 | |
| 1008 | minpacket = sizeof(*outip) + sizeof(*outdata) + optlen; |
| 1009 | |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 1010 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1011 | if (useicmp) |
| 1012 | minpacket += 8; /* XXX magic number */ |
| 1013 | else |
| 1014 | #endif |
| 1015 | minpacket += sizeof(*outudp); |
| 1016 | packlen = minpacket; /* minimum sized packet */ |
| 1017 | |
| 1018 | /* Process destination and optional packet size */ |
| 1019 | switch (argc - optind) { |
| 1020 | |
| 1021 | case 2: |
Denis Vlasenko | 1385899 | 2006-10-08 12:49:22 +0000 | [diff] [blame] | 1022 | packlen = xatoul_range(argv[optind + 1], minpacket, maxpacket); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1023 | /* Fall through */ |
| 1024 | |
| 1025 | case 1: |
| 1026 | hostname = argv[optind]; |
| 1027 | hi = gethostinfo(hostname); |
| 1028 | setsin(to, hi->addrs[0]); |
| 1029 | if (hi->n > 1) |
Denis Vlasenko | 1385899 | 2006-10-08 12:49:22 +0000 | [diff] [blame] | 1030 | bb_error_msg("warning: %s has multiple addresses; using %s", |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1031 | hostname, inet_ntoa(to->sin_addr)); |
| 1032 | hostname = hi->name; |
| 1033 | hi->name = NULL; |
| 1034 | freehostinfo(hi); |
| 1035 | break; |
| 1036 | |
| 1037 | default: |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1038 | bb_show_usage(); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1039 | } |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1040 | |
Denis Vlasenko | e06bed3 | 2007-01-27 22:21:12 +0000 | [diff] [blame] | 1041 | /* Ensure the socket fds won't be 0, 1 or 2 */ |
| 1042 | bb_sanitize_stdio(); |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1043 | |
Denis Vlasenko | 6edadde | 2006-10-03 18:19:02 +0000 | [diff] [blame] | 1044 | s = xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 1045 | |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 1046 | #if TRACEROUTE_SO_DEBUG |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1047 | if (op & OPT_DEBUG) |
Denis Vlasenko | 703e202 | 2007-01-22 14:12:08 +0000 | [diff] [blame] | 1048 | setsockopt(s, SOL_SOCKET, SO_DEBUG, |
| 1049 | &const_int_1, sizeof(const_int_1)); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 1050 | #endif |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1051 | if (op & OPT_BYPASS_ROUTE) |
Denis Vlasenko | 703e202 | 2007-01-22 14:12:08 +0000 | [diff] [blame] | 1052 | setsockopt(s, SOL_SOCKET, SO_DONTROUTE, |
| 1053 | &const_int_1, sizeof(const_int_1)); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1054 | |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 1055 | sndsock = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1056 | |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 1057 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1058 | #if defined(IP_OPTIONS) |
| 1059 | if (lsrr > 0) { |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 1060 | unsigned char optlist[MAX_IPOPTLEN]; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1061 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1062 | /* final hop */ |
| 1063 | gwlist[lsrr] = to->sin_addr.s_addr; |
| 1064 | ++lsrr; |
| 1065 | |
| 1066 | /* force 4 byte alignment */ |
| 1067 | optlist[0] = IPOPT_NOP; |
| 1068 | /* loose source route option */ |
| 1069 | optlist[1] = IPOPT_LSRR; |
| 1070 | i = lsrr * sizeof(gwlist[0]); |
| 1071 | optlist[2] = i + 3; |
| 1072 | /* Pointer to LSRR addresses */ |
| 1073 | optlist[3] = IPOPT_MINOFF; |
| 1074 | memcpy(optlist + 4, gwlist, i); |
| 1075 | |
Denis Vlasenko | 6edadde | 2006-10-03 18:19:02 +0000 | [diff] [blame] | 1076 | if ((setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS, |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1077 | (char *)optlist, i + sizeof(gwlist[0]))) < 0) { |
| 1078 | bb_perror_msg_and_die("IP_OPTIONS"); |
Denis Vlasenko | 6edadde | 2006-10-03 18:19:02 +0000 | [diff] [blame] | 1079 | } |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1080 | } |
| 1081 | #endif /* IP_OPTIONS */ |
| 1082 | #endif /* CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE */ |
| 1083 | |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1084 | #ifdef SO_SNDBUF |
Denis Vlasenko | 703e202 | 2007-01-22 14:12:08 +0000 | [diff] [blame] | 1085 | if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, &packlen, sizeof(packlen)) < 0) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1086 | bb_perror_msg_and_die("SO_SNDBUF"); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1087 | } |
Eric Andersen | ad79c0b | 2002-06-06 12:24:51 +0000 | [diff] [blame] | 1088 | #endif |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1089 | #ifdef IP_HDRINCL |
Denis Vlasenko | 703e202 | 2007-01-22 14:12:08 +0000 | [diff] [blame] | 1090 | if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, &const_int_1, sizeof(const_int_1)) < 0 |
| 1091 | && errno != ENOPROTOOPT |
| 1092 | ) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1093 | bb_perror_msg_and_die("IP_HDRINCL"); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1094 | } |
| 1095 | #else |
| 1096 | #ifdef IP_TOS |
Denis Vlasenko | 703e202 | 2007-01-22 14:12:08 +0000 | [diff] [blame] | 1097 | if (tos_str && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1098 | bb_perror_msg_and_die("setsockopt tos %d", tos); |
| 1099 | } |
| 1100 | #endif |
Eric Andersen | ad79c0b | 2002-06-06 12:24:51 +0000 | [diff] [blame] | 1101 | #endif |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 1102 | #if TRACEROUTE_SO_DEBUG |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1103 | if (op & OPT_DEBUG) |
Denis Vlasenko | 703e202 | 2007-01-22 14:12:08 +0000 | [diff] [blame] | 1104 | setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, |
| 1105 | &const_int_1, sizeof(const_int_1)); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 1106 | #endif |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1107 | if (op & OPT_BYPASS_ROUTE) |
Denis Vlasenko | 703e202 | 2007-01-22 14:12:08 +0000 | [diff] [blame] | 1108 | setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, |
| 1109 | &const_int_1, sizeof(const_int_1)); |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1110 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1111 | /* Revert to non-privileged user after opening sockets */ |
Rob Landley | afb94ec | 2006-07-16 08:06:34 +0000 | [diff] [blame] | 1112 | xsetgid(getgid()); |
| 1113 | xsetuid(getuid()); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1114 | |
Denis Vlasenko | 4cccc03 | 2006-12-22 18:37:07 +0000 | [diff] [blame] | 1115 | outip = xzalloc(packlen); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1116 | |
| 1117 | outip->ip_v = IPVERSION; |
| 1118 | if (tos_str) |
| 1119 | outip->ip_tos = tos; |
| 1120 | outip->ip_len = htons(packlen); |
| 1121 | outip->ip_off = htons(off); |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 1122 | outp = (unsigned char *)(outip + 1); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1123 | outip->ip_dst = to->sin_addr; |
| 1124 | |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 1125 | outip->ip_hl = (outp - (unsigned char *)outip) >> 2; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1126 | ident = (getpid() & 0xffff) | 0x8000; |
Denis Vlasenko | 04291bc | 2006-11-21 10:15:25 +0000 | [diff] [blame] | 1127 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1128 | if (useicmp) { |
| 1129 | outip->ip_p = IPPROTO_ICMP; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1130 | outicmp = (struct icmp *)outp; |
| 1131 | outicmp->icmp_type = ICMP_ECHO; |
| 1132 | outicmp->icmp_id = htons(ident); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1133 | outdata = (struct outdata *)(outp + 8); /* XXX magic number */ |
| 1134 | } else |
Eric Andersen | ad79c0b | 2002-06-06 12:24:51 +0000 | [diff] [blame] | 1135 | #endif |
Denis Vlasenko | 2870301 | 2006-12-19 20:32:02 +0000 | [diff] [blame] | 1136 | { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1137 | outip->ip_p = IPPROTO_UDP; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1138 | outudp = (struct udphdr *)outp; |
| 1139 | outudp->source = htons(ident); |
Denis Vlasenko | 2870301 | 2006-12-19 20:32:02 +0000 | [diff] [blame] | 1140 | outudp->len = htons((uint16_t)(packlen - (sizeof(*outip) + optlen))); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1141 | outdata = (struct outdata *)(outudp + 1); |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1142 | } |
| 1143 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1144 | /* Get the interface address list */ |
| 1145 | n = ifaddrlist(&al); |
| 1146 | |
| 1147 | /* Look for a specific device */ |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1148 | if (op & OPT_DEVICE) { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1149 | for (i = n; i > 0; --i, ++al) |
| 1150 | if (strcmp(device, al->device) == 0) |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1151 | goto found_dev; |
| 1152 | bb_error_msg_and_die("can't find interface %s", device); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1153 | } |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1154 | found_dev: |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1155 | |
| 1156 | /* Determine our source address */ |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1157 | if (!(op & OPT_SOURCE)) { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1158 | /* |
| 1159 | * If a device was specified, use the interface address. |
| 1160 | * Otherwise, try to determine our source address. |
| 1161 | */ |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1162 | if (op & OPT_DEVICE) |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1163 | setsin(from, al->addr); |
| 1164 | findsaddr(to, from); |
| 1165 | } else { |
| 1166 | hi = gethostinfo(source); |
| 1167 | source = hi->name; |
| 1168 | hi->name = NULL; |
| 1169 | /* |
| 1170 | * If the device was specified make sure it |
| 1171 | * corresponds to the source address specified. |
| 1172 | * Otherwise, use the first address (and warn if |
| 1173 | * there are more than one). |
| 1174 | */ |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1175 | if (op & OPT_DEVICE) { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1176 | for (i = hi->n, ap = hi->addrs; i > 0; --i, ++ap) |
| 1177 | if (*ap == al->addr) |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1178 | goto found_dev2; |
| 1179 | bb_error_msg_and_die("%s is not on interface %s", |
| 1180 | source, device); |
| 1181 | found_dev2: |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1182 | setsin(from, *ap); |
| 1183 | } else { |
| 1184 | setsin(from, hi->addrs[0]); |
| 1185 | if (hi->n > 1) |
| 1186 | bb_error_msg( |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1187 | "warning: %s has multiple addresses; using %s", |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1188 | source, inet_ntoa(from->sin_addr)); |
| 1189 | } |
| 1190 | freehostinfo(hi); |
| 1191 | } |
| 1192 | |
| 1193 | outip->ip_src = from->sin_addr; |
| 1194 | #ifndef IP_HDRINCL |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 1195 | xbind(sndsock, (struct sockaddr *)from, sizeof(*from)); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1196 | #endif |
| 1197 | |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1198 | printf("traceroute to %s (%s)", hostname, inet_ntoa(to->sin_addr)); |
| 1199 | if (op & OPT_SOURCE) |
| 1200 | printf(" from %s", source); |
| 1201 | printf(", %d hops max, %d byte packets\n", max_ttl, packlen); |
| 1202 | fflush(stdout); |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1203 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1204 | for (ttl = first_ttl; ttl <= max_ttl; ++ttl) { |
Denis Vlasenko | 35d4da0 | 2007-01-22 14:04:27 +0000 | [diff] [blame] | 1205 | uint32_t lastaddr = 0; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1206 | int gotlastaddr = 0; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1207 | int got_there = 0; |
| 1208 | int unreachable = 0; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1209 | int sentfirst = 0; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1210 | |
| 1211 | printf("%2d ", ttl); |
| 1212 | for (probe = 0; probe < nprobes; ++probe) { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1213 | int cc; |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 1214 | unsigned t1; |
| 1215 | unsigned t2; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1216 | struct ip *ip; |
| 1217 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1218 | if (sentfirst && pausemsecs > 0) |
| 1219 | usleep(pausemsecs * 1000); |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 1220 | t1 = monotonic_us(); |
| 1221 | send_probe(++seq, ttl); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1222 | ++sentfirst; |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 1223 | while ((cc = wait_for_reply(s, from)) != 0) { |
| 1224 | t2 = monotonic_us(); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1225 | i = packet_ok(packet, cc, from, seq); |
| 1226 | /* Skip short packet */ |
| 1227 | if (i == 0) |
| 1228 | continue; |
| 1229 | if (!gotlastaddr || |
| 1230 | from->sin_addr.s_addr != lastaddr) { |
| 1231 | print(packet, cc, from); |
| 1232 | lastaddr = from->sin_addr.s_addr; |
| 1233 | ++gotlastaddr; |
| 1234 | } |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 1235 | print_delta_ms(t1, t2); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1236 | ip = (struct ip *)packet; |
Denis Vlasenko | 2e72323 | 2007-03-29 21:55:22 +0000 | [diff] [blame] | 1237 | if (op & OPT_TTL_FLAG) |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1238 | printf(" (%d)", ip->ip_ttl); |
| 1239 | if (i == -2) { |
| 1240 | if (ip->ip_ttl <= 1) |
| 1241 | printf(" !"); |
| 1242 | ++got_there; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1243 | break; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1244 | } |
| 1245 | /* time exceeded in transit */ |
| 1246 | if (i == -1) |
| 1247 | break; |
| 1248 | code = i - 1; |
| 1249 | switch (code) { |
| 1250 | |
| 1251 | case ICMP_UNREACH_PORT: |
| 1252 | if (ip->ip_ttl <= 1) |
| 1253 | printf(" !"); |
| 1254 | ++got_there; |
| 1255 | break; |
| 1256 | |
| 1257 | case ICMP_UNREACH_NET: |
| 1258 | ++unreachable; |
| 1259 | printf(" !N"); |
| 1260 | break; |
| 1261 | |
| 1262 | case ICMP_UNREACH_HOST: |
| 1263 | ++unreachable; |
| 1264 | printf(" !H"); |
| 1265 | break; |
| 1266 | |
| 1267 | case ICMP_UNREACH_PROTOCOL: |
| 1268 | ++got_there; |
| 1269 | printf(" !P"); |
| 1270 | break; |
| 1271 | |
| 1272 | case ICMP_UNREACH_NEEDFRAG: |
| 1273 | ++unreachable; |
| 1274 | printf(" !F-%d", pmtu); |
| 1275 | break; |
| 1276 | |
| 1277 | case ICMP_UNREACH_SRCFAIL: |
| 1278 | ++unreachable; |
| 1279 | printf(" !S"); |
| 1280 | break; |
| 1281 | |
| 1282 | case ICMP_UNREACH_FILTER_PROHIB: |
| 1283 | case ICMP_UNREACH_NET_PROHIB: /* misuse */ |
| 1284 | ++unreachable; |
| 1285 | printf(" !A"); |
| 1286 | break; |
| 1287 | |
| 1288 | case ICMP_UNREACH_HOST_PROHIB: |
| 1289 | ++unreachable; |
| 1290 | printf(" !C"); |
| 1291 | break; |
| 1292 | |
| 1293 | case ICMP_UNREACH_HOST_PRECEDENCE: |
| 1294 | ++unreachable; |
| 1295 | printf(" !V"); |
| 1296 | break; |
| 1297 | |
| 1298 | case ICMP_UNREACH_PRECEDENCE_CUTOFF: |
| 1299 | ++unreachable; |
| 1300 | printf(" !C"); |
| 1301 | break; |
| 1302 | |
| 1303 | case ICMP_UNREACH_NET_UNKNOWN: |
| 1304 | case ICMP_UNREACH_HOST_UNKNOWN: |
| 1305 | ++unreachable; |
| 1306 | printf(" !U"); |
| 1307 | break; |
| 1308 | |
| 1309 | case ICMP_UNREACH_ISOLATED: |
| 1310 | ++unreachable; |
| 1311 | printf(" !I"); |
| 1312 | break; |
| 1313 | |
| 1314 | case ICMP_UNREACH_TOSNET: |
| 1315 | case ICMP_UNREACH_TOSHOST: |
| 1316 | ++unreachable; |
| 1317 | printf(" !T"); |
| 1318 | break; |
| 1319 | |
| 1320 | default: |
| 1321 | ++unreachable; |
| 1322 | printf(" !<%d>", code); |
| 1323 | break; |
| 1324 | } |
| 1325 | break; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1326 | } |
| 1327 | if (cc == 0) |
| 1328 | printf(" *"); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1329 | (void)fflush(stdout); |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1330 | } |
| 1331 | putchar('\n'); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1332 | if (got_there || |
| 1333 | (unreachable > 0 && unreachable >= nprobes - 1)) |
| 1334 | break; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1335 | } |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1336 | return 0; |
| 1337 | } |