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 | |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 199 | #undef CONFIG_FEATURE_TRACEROUTE_VERBOSE |
| 200 | //#define CONFIG_FEATURE_TRACEROUTE_VERBOSE |
| 201 | #undef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG /* not in documentation man */ |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 202 | #undef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| 203 | //#define CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| 204 | #undef CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
| 205 | //#define CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 206 | |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 207 | #include <errno.h> |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 208 | #include <stdio.h> |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 209 | #include <stdlib.h> |
| 210 | #include <string.h> |
| 211 | #include <unistd.h> |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 212 | #include <fcntl.h> |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 213 | #include <netdb.h> |
| 214 | #include <endian.h> |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 215 | #include <getopt.h> |
| 216 | |
| 217 | #include <sys/param.h> |
| 218 | #include <sys/file.h> |
| 219 | #include <sys/ioctl.h> |
| 220 | #include <sys/socket.h> |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 221 | #include <sys/select.h> |
| 222 | #include "inet_common.h" |
| 223 | |
| 224 | #include <net/if.h> |
| 225 | #include <netinet/in.h> |
| 226 | #include <arpa/inet.h> |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 227 | #include <netinet/udp.h> |
| 228 | #include <netinet/ip.h> |
| 229 | #include <netinet/ip_icmp.h> |
| 230 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 231 | #include "busybox.h" |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 232 | |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 233 | |
| 234 | /* |
| 235 | * Definitions for internet protocol version 4. |
| 236 | * Per RFC 791, September 1981. |
| 237 | */ |
| 238 | #define IPVERSION 4 |
| 239 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 240 | /* |
| 241 | * Overlay for ip header used by other protocols (tcp, udp). |
| 242 | */ |
| 243 | struct ipovly { |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 244 | unsigned char ih_x1[9]; /* (unused) */ |
| 245 | unsigned char ih_pr; /* protocol */ |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 246 | short ih_len; /* protocol length */ |
| 247 | struct in_addr ih_src; /* source internet address */ |
| 248 | struct in_addr ih_dst; /* destination internet address */ |
| 249 | }; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 250 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 251 | /* |
| 252 | * UDP kernel structures and variables. |
| 253 | */ |
| 254 | struct udpiphdr { |
| 255 | struct ipovly ui_i; /* overlaid ip structure */ |
| 256 | struct udphdr ui_u; /* udp header */ |
| 257 | }; |
| 258 | #define ui_next ui_i.ih_next |
| 259 | #define ui_prev ui_i.ih_prev |
| 260 | #define ui_x1 ui_i.ih_x1 |
| 261 | #define ui_pr ui_i.ih_pr |
| 262 | #define ui_len ui_i.ih_len |
| 263 | #define ui_src ui_i.ih_src |
| 264 | #define ui_dst ui_i.ih_dst |
| 265 | #define ui_sport ui_u.uh_sport |
| 266 | #define ui_dport ui_u.uh_dport |
| 267 | #define ui_ulen ui_u.uh_ulen |
| 268 | #define ui_sum ui_u.uh_sum |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 269 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 270 | |
| 271 | /* Host name and address list */ |
| 272 | struct hostinfo { |
| 273 | char *name; |
| 274 | int n; |
| 275 | u_int32_t *addrs; |
| 276 | }; |
| 277 | |
| 278 | /* Data section of the probe packet */ |
| 279 | struct outdata { |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 280 | unsigned char seq; /* sequence number of this packet */ |
| 281 | unsigned char ttl; /* ttl packet left with */ |
Bernhard Reutner-Fischer | 86f5c99 | 2006-01-22 22:55:11 +0000 | [diff] [blame] | 282 | struct timeval tv ATTRIBUTE_PACKED; /* time packet left */ |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 283 | }; |
| 284 | |
| 285 | struct IFADDRLIST { |
| 286 | u_int32_t addr; |
| 287 | char device[sizeof(struct ifreq)]; |
| 288 | }; |
| 289 | |
| 290 | |
| 291 | static const char route[] = "/proc/net/route"; |
| 292 | |
| 293 | /* last inbound (icmp) packet */ |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 294 | static unsigned char packet[512] ATTRIBUTE_ALIGNED(32); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 295 | |
| 296 | static struct ip *outip; /* last output (udp) packet */ |
| 297 | static struct udphdr *outudp; /* last output (udp) packet */ |
| 298 | static struct outdata *outdata; /* last output (udp) packet */ |
| 299 | |
| 300 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
| 301 | static struct icmp *outicmp; /* last output (icmp) packet */ |
| 302 | #endif |
| 303 | |
| 304 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| 305 | /* Maximum number of gateways (include room for one noop) */ |
| 306 | #define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(u_int32_t))) |
| 307 | /* loose source route gateway list (including room for final destination) */ |
| 308 | static u_int32_t gwlist[NGATEWAYS + 1]; |
| 309 | #endif |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 310 | |
| 311 | static int s; /* receive (icmp) socket file descriptor */ |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 312 | static int sndsock; /* send (udp/icmp) socket file descriptor */ |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 313 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 314 | static struct sockaddr_storage whereto; /* Who to try to reach */ |
| 315 | static struct sockaddr_storage wherefrom; /* Who we are */ |
| 316 | static int packlen; /* total length of packet */ |
| 317 | static int minpacket; /* min ip packet size */ |
| 318 | static int maxpacket = 32 * 1024; /* max ip packet size */ |
| 319 | static int pmtu; /* Path MTU Discovery (RFC1191) */ |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 320 | |
| 321 | static char *hostname; |
| 322 | |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 323 | static u_short ident; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 324 | static u_short port = 32768 + 666; /* start udp dest port # for probe packets */ |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 325 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 326 | static int waittime = 5; /* time to wait for response (in seconds) */ |
| 327 | static int nflag; /* print addresses numerically */ |
| 328 | static int doipcksum = 1; /* calculate ip checksums by default */ |
| 329 | |
| 330 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| 331 | static int optlen; /* length of ip options */ |
| 332 | #else |
| 333 | #define optlen 0 |
| 334 | #endif |
| 335 | |
| 336 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
| 337 | static int useicmp; /* use icmp echo instead of udp packets */ |
| 338 | #endif |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 339 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 340 | static int verbose; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 341 | #endif |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 342 | |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 343 | /* |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 344 | * Return the interface list |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 345 | */ |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 346 | static int |
| 347 | ifaddrlist(struct IFADDRLIST **ipaddrp) |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 348 | { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 349 | int fd, nipaddr; |
| 350 | #ifdef HAVE_SOCKADDR_SA_LEN |
| 351 | int n; |
| 352 | #endif |
| 353 | struct ifreq *ifrp, *ifend, *ifnext; |
| 354 | struct sockaddr_in *addr_sin; |
| 355 | struct IFADDRLIST *al; |
| 356 | struct ifconf ifc; |
| 357 | struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr; |
| 358 | struct IFADDRLIST *st_ifaddrlist; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 359 | |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 360 | fd = xsocket(AF_INET, SOCK_DGRAM, 0); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 361 | |
| 362 | ifc.ifc_len = sizeof(ibuf); |
| 363 | ifc.ifc_buf = (caddr_t)ibuf; |
| 364 | |
| 365 | if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 || |
| 366 | ifc.ifc_len < sizeof(struct ifreq)) { |
| 367 | if (errno == EINVAL) |
| 368 | bb_error_msg_and_die( |
| 369 | "SIOCGIFCONF: ifreq struct too small (%d bytes)", |
Eric Andersen | 0cb6f35 | 2006-01-30 22:30:41 +0000 | [diff] [blame] | 370 | (int)sizeof(ibuf)); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 371 | else |
| 372 | bb_perror_msg_and_die("SIOCGIFCONF"); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 373 | } |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 374 | ifrp = ibuf; |
| 375 | ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len); |
| 376 | |
| 377 | nipaddr = 1 + (ifc.ifc_len / sizeof(struct ifreq)); |
Rob Landley | 081e384 | 2006-08-03 20:07:35 +0000 | [diff] [blame] | 378 | st_ifaddrlist = xzalloc(nipaddr * sizeof(struct IFADDRLIST)); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 379 | al = st_ifaddrlist; |
| 380 | nipaddr = 0; |
| 381 | |
| 382 | for (; ifrp < ifend; ifrp = ifnext) { |
| 383 | #ifdef HAVE_SOCKADDR_SA_LEN |
| 384 | n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name); |
| 385 | if (n < sizeof(*ifrp)) |
| 386 | ifnext = ifrp + 1; |
| 387 | else |
| 388 | ifnext = (struct ifreq *)((char *)ifrp + n); |
| 389 | if (ifrp->ifr_addr.sa_family != AF_INET) |
| 390 | continue; |
| 391 | #else |
| 392 | ifnext = ifrp + 1; |
| 393 | #endif |
| 394 | /* |
| 395 | * Need a template to preserve address info that is |
| 396 | * used below to locate the next entry. (Otherwise, |
| 397 | * SIOCGIFFLAGS stomps over it because the requests |
| 398 | * are returned in a union.) |
| 399 | */ |
| 400 | strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name)); |
| 401 | if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) { |
| 402 | if (errno == ENXIO) |
| 403 | continue; |
| 404 | bb_perror_msg_and_die("SIOCGIFFLAGS: %.*s", |
| 405 | (int)sizeof(ifr.ifr_name), ifr.ifr_name); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 406 | } |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 407 | |
| 408 | /* Must be up */ |
| 409 | if ((ifr.ifr_flags & IFF_UP) == 0) |
| 410 | continue; |
| 411 | |
| 412 | safe_strncpy(al->device, ifr.ifr_name, sizeof(ifr.ifr_name) + 1); |
| 413 | #ifdef sun |
| 414 | /* Ignore sun virtual interfaces */ |
| 415 | if (strchr(al->device, ':') != NULL) |
| 416 | continue; |
| 417 | #endif |
| 418 | if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) |
| 419 | bb_perror_msg_and_die("SIOCGIFADDR: %s", al->device); |
| 420 | |
| 421 | addr_sin = (struct sockaddr_in *)&ifr.ifr_addr; |
| 422 | al->addr = addr_sin->sin_addr.s_addr; |
| 423 | ++al; |
| 424 | ++nipaddr; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 425 | } |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 426 | if(nipaddr == 0) |
| 427 | bb_error_msg_and_die ("Can't find any network interfaces"); |
| 428 | (void)close(fd); |
| 429 | |
| 430 | *ipaddrp = st_ifaddrlist; |
| 431 | return nipaddr; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 432 | } |
| 433 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 434 | |
| 435 | static void |
| 436 | setsin(struct sockaddr_in *addr_sin, u_int32_t addr) |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 437 | { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 438 | memset(addr_sin, 0, sizeof(*addr_sin)); |
| 439 | #ifdef HAVE_SOCKADDR_SA_LEN |
| 440 | addr_sin->sin_len = sizeof(*addr_sin); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 441 | #endif |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 442 | addr_sin->sin_family = AF_INET; |
| 443 | addr_sin->sin_addr.s_addr = addr; |
| 444 | } |
| 445 | |
| 446 | |
| 447 | /* |
| 448 | * Return the source address for the given destination address |
| 449 | */ |
| 450 | static void |
| 451 | findsaddr(const struct sockaddr_in *to, struct sockaddr_in *from) |
| 452 | { |
| 453 | int i, n; |
| 454 | FILE *f; |
| 455 | u_int32_t mask; |
| 456 | u_int32_t dest, tmask; |
| 457 | struct IFADDRLIST *al; |
| 458 | char buf[256], tdevice[256], device[256]; |
| 459 | |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 460 | f = xfopen(route, "r"); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 461 | |
| 462 | /* Find the appropriate interface */ |
| 463 | n = 0; |
| 464 | mask = 0; |
| 465 | device[0] = '\0'; |
| 466 | while (fgets(buf, sizeof(buf), f) != NULL) { |
| 467 | ++n; |
| 468 | if (n == 1 && strncmp(buf, "Iface", 5) == 0) |
| 469 | continue; |
| 470 | if ((i = sscanf(buf, "%255s %x %*s %*s %*s %*s %*s %x", |
| 471 | tdevice, &dest, &tmask)) != 3) |
| 472 | bb_error_msg_and_die ("junk in buffer"); |
| 473 | if ((to->sin_addr.s_addr & tmask) == dest && |
| 474 | (tmask > mask || mask == 0)) { |
| 475 | mask = tmask; |
| 476 | strcpy(device, tdevice); |
| 477 | } |
| 478 | } |
| 479 | fclose(f); |
| 480 | |
| 481 | if (device[0] == '\0') |
| 482 | bb_error_msg_and_die ("Can't find interface"); |
| 483 | |
| 484 | /* Get the interface address list */ |
| 485 | n = ifaddrlist(&al); |
| 486 | |
| 487 | /* Find our appropriate source address */ |
| 488 | for (i = n; i > 0; --i, ++al) |
| 489 | if (strcmp(device, al->device) == 0) |
| 490 | break; |
| 491 | if (i <= 0) |
| 492 | bb_error_msg_and_die("Can't find interface %s", device); |
| 493 | |
| 494 | setsin(from, al->addr); |
| 495 | } |
| 496 | |
| 497 | /* |
| 498 | "Usage: %s [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]\n" |
| 499 | "\t[-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]\n" |
| 500 | "\t[-w waittime] [-z pausemsecs] host [packetlen]" |
| 501 | |
| 502 | */ |
| 503 | |
| 504 | /* String to value with optional min and max. Handles decimal and hex. */ |
| 505 | static int |
| 506 | str2val(const char *str, const char *what, int mi, int ma) |
| 507 | { |
| 508 | const char *cp; |
| 509 | int val; |
| 510 | char *ep; |
| 511 | |
| 512 | if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) { |
| 513 | cp = str + 2; |
| 514 | val = (int)strtol(cp, &ep, 16); |
| 515 | } else |
| 516 | val = (int)strtol(str, &ep, 10); |
| 517 | if (*ep != '\0') { |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 518 | bb_error_msg_and_die("\"%s\" bad value for %s", str, what); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 519 | } |
| 520 | if (val < mi && mi >= 0) { |
| 521 | if (mi == 0) |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 522 | bb_error_msg_and_die("%s must be >= %d", what, mi); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 523 | else |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 524 | bb_error_msg_and_die("%s must be > %d", what, mi - 1); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 525 | } |
| 526 | if (val > ma && ma >= 0) |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 527 | bb_error_msg_and_die("%s must be <= %d", what, ma); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 528 | return val; |
| 529 | } |
| 530 | |
| 531 | |
| 532 | /* |
| 533 | * Subtract 2 timeval structs: out = out - in. |
| 534 | * Out is assumed to be >= in. |
| 535 | */ |
| 536 | static inline void |
| 537 | tvsub(struct timeval *out, struct timeval *in) |
| 538 | { |
| 539 | |
| 540 | if ((out->tv_usec -= in->tv_usec) < 0) { |
| 541 | --out->tv_sec; |
| 542 | out->tv_usec += 1000000; |
| 543 | } |
| 544 | out->tv_sec -= in->tv_sec; |
| 545 | } |
| 546 | |
| 547 | static int |
| 548 | wait_for_reply(int sock, struct sockaddr_in *fromp, const struct timeval *tp) |
| 549 | { |
| 550 | fd_set fds; |
Rob Landley | c9c1a41 | 2006-07-12 19:17:55 +0000 | [diff] [blame] | 551 | struct timeval now, tvwait; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 552 | struct timezone tz; |
| 553 | int cc = 0; |
| 554 | socklen_t fromlen = sizeof(*fromp); |
| 555 | |
| 556 | FD_ZERO(&fds); |
| 557 | FD_SET(sock, &fds); |
| 558 | |
Rob Landley | c9c1a41 | 2006-07-12 19:17:55 +0000 | [diff] [blame] | 559 | tvwait.tv_sec = tp->tv_sec + waittime; |
| 560 | tvwait.tv_usec = tp->tv_usec; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 561 | (void)gettimeofday(&now, &tz); |
Rob Landley | c9c1a41 | 2006-07-12 19:17:55 +0000 | [diff] [blame] | 562 | tvsub(&tvwait, &now); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 563 | |
Rob Landley | c9c1a41 | 2006-07-12 19:17:55 +0000 | [diff] [blame] | 564 | if (select(sock + 1, &fds, NULL, NULL, &tvwait) > 0) |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 565 | cc = recvfrom(sock, (char *)packet, sizeof(packet), 0, |
| 566 | (struct sockaddr *)fromp, &fromlen); |
| 567 | |
| 568 | return cc; |
| 569 | } |
| 570 | |
| 571 | /* |
| 572 | * Checksum routine for Internet Protocol family headers (C Version) |
| 573 | */ |
| 574 | static u_short |
| 575 | in_cksum(u_short *addr, int len) |
| 576 | { |
| 577 | int nleft = len; |
| 578 | u_short *w = addr; |
| 579 | u_short answer; |
| 580 | int sum = 0; |
| 581 | |
| 582 | /* |
| 583 | * Our algorithm is simple, using a 32 bit accumulator (sum), |
| 584 | * we add sequential 16 bit words to it, and at the end, fold |
| 585 | * back all the carry bits from the top 16 bits into the lower |
| 586 | * 16 bits. |
| 587 | */ |
| 588 | while (nleft > 1) { |
| 589 | sum += *w++; |
| 590 | nleft -= 2; |
| 591 | } |
| 592 | |
| 593 | /* mop up an odd byte, if necessary */ |
| 594 | if (nleft == 1) |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 595 | sum += *(unsigned char *)w; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 596 | |
| 597 | /* |
| 598 | * add back carry outs from top 16 bits to low 16 bits |
| 599 | */ |
| 600 | sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ |
| 601 | sum += (sum >> 16); /* add carry */ |
| 602 | answer = ~sum; /* truncate to 16 bits */ |
| 603 | return answer; |
| 604 | } |
| 605 | |
| 606 | |
| 607 | static void |
| 608 | send_probe(int seq, int ttl, struct timeval *tp) |
| 609 | { |
| 610 | int cc; |
| 611 | struct udpiphdr *ui, *oui; |
| 612 | struct ip tip; |
| 613 | |
| 614 | outip->ip_ttl = ttl; |
| 615 | outip->ip_id = htons(ident + seq); |
| 616 | |
| 617 | /* |
| 618 | * In most cases, the kernel will recalculate the ip checksum. |
| 619 | * But we must do it anyway so that the udp checksum comes out |
| 620 | * right. |
| 621 | */ |
| 622 | if (doipcksum) { |
| 623 | outip->ip_sum = |
| 624 | in_cksum((u_short *)outip, sizeof(*outip) + optlen); |
| 625 | if (outip->ip_sum == 0) |
| 626 | outip->ip_sum = 0xffff; |
| 627 | } |
| 628 | |
| 629 | /* Payload */ |
| 630 | outdata->seq = seq; |
| 631 | outdata->ttl = ttl; |
| 632 | memcpy(&outdata->tv, tp, sizeof(outdata->tv)); |
| 633 | |
| 634 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
| 635 | if (useicmp) |
| 636 | outicmp->icmp_seq = htons(seq); |
| 637 | else |
| 638 | #endif |
| 639 | outudp->dest = htons(port + seq); |
| 640 | |
| 641 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
| 642 | if (useicmp) { |
| 643 | /* Always calculate checksum for icmp packets */ |
| 644 | outicmp->icmp_cksum = 0; |
| 645 | outicmp->icmp_cksum = in_cksum((u_short *)outicmp, |
| 646 | packlen - (sizeof(*outip) + optlen)); |
| 647 | if (outicmp->icmp_cksum == 0) |
| 648 | outicmp->icmp_cksum = 0xffff; |
| 649 | } else |
| 650 | #endif |
| 651 | if (doipcksum) { |
| 652 | /* Checksum (we must save and restore ip header) */ |
| 653 | tip = *outip; |
| 654 | ui = (struct udpiphdr *)outip; |
| 655 | oui = (struct udpiphdr *)&tip; |
| 656 | /* Easier to zero and put back things that are ok */ |
| 657 | memset((char *)ui, 0, sizeof(ui->ui_i)); |
| 658 | ui->ui_src = oui->ui_src; |
| 659 | ui->ui_dst = oui->ui_dst; |
| 660 | ui->ui_pr = oui->ui_pr; |
| 661 | ui->ui_len = outudp->len; |
| 662 | outudp->check = 0; |
| 663 | outudp->check = in_cksum((u_short *)ui, packlen); |
| 664 | if (outudp->check == 0) |
| 665 | outudp->check = 0xffff; |
| 666 | *outip = tip; |
| 667 | } |
| 668 | |
| 669 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE |
| 670 | /* XXX undocumented debugging hack */ |
| 671 | if (verbose > 1) { |
| 672 | const u_short *sp; |
| 673 | int nshorts, i; |
| 674 | |
| 675 | sp = (u_short *)outip; |
| 676 | nshorts = (u_int)packlen / sizeof(u_short); |
| 677 | i = 0; |
| 678 | printf("[ %d bytes", packlen); |
| 679 | while (--nshorts >= 0) { |
| 680 | if ((i++ % 8) == 0) |
| 681 | printf("\n\t"); |
| 682 | printf(" %04x", ntohs(*sp)); |
| 683 | sp++; |
| 684 | } |
| 685 | if (packlen & 1) { |
| 686 | if ((i % 8) == 0) |
| 687 | printf("\n\t"); |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 688 | printf(" %02x", *(unsigned char *)sp); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 689 | } |
| 690 | printf("]\n"); |
| 691 | } |
| 692 | #endif |
| 693 | |
| 694 | #if !defined(IP_HDRINCL) && defined(IP_TTL) |
| 695 | if (setsockopt(sndsock, IPPROTO_IP, IP_TTL, |
| 696 | (char *)&ttl, sizeof(ttl)) < 0) { |
| 697 | bb_perror_msg_and_die("setsockopt ttl %d", ttl); |
| 698 | } |
| 699 | #endif |
| 700 | |
| 701 | cc = sendto(sndsock, (char *)outip, |
| 702 | packlen, 0, (struct sockaddr *)&whereto, sizeof(whereto)); |
| 703 | if (cc < 0 || cc != packlen) { |
| 704 | if (cc < 0) |
| 705 | bb_perror_msg_and_die("sendto"); |
| 706 | printf("%s: wrote %s %d chars, ret=%d\n", |
| 707 | bb_applet_name, hostname, packlen, cc); |
| 708 | (void)fflush(stdout); |
| 709 | } |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 710 | } |
| 711 | |
| 712 | static inline double |
| 713 | deltaT(struct timeval *t1p, struct timeval *t2p) |
| 714 | { |
| 715 | double dt; |
| 716 | |
| 717 | dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + |
| 718 | (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 719 | return dt; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 720 | } |
| 721 | |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 722 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 723 | /* |
| 724 | * Convert an ICMP "type" field to a printable string. |
| 725 | */ |
| 726 | static inline const char * |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 727 | pr_type(unsigned char t) |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 728 | { |
| 729 | static const char * const ttab[] = { |
| 730 | "Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable", |
| 731 | "Source Quench", "Redirect", "ICMP 6", "ICMP 7", |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 732 | "Echo", "Router Advert", "Router Solicit", "Time Exceeded", |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 733 | "Param Problem", "Timestamp", "Timestamp Reply", "Info Request", |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 734 | "Info Reply", "Mask Request", "Mask Reply" |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 735 | }; |
| 736 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 737 | if (t > 18) |
| 738 | return "OUT-OF-RANGE"; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 739 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 740 | return ttab[t]; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 741 | } |
| 742 | #endif |
| 743 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 744 | static int |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 745 | 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] | 746 | { |
| 747 | struct icmp *icp; |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 748 | unsigned char type, code; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 749 | int hlen; |
| 750 | struct ip *ip; |
| 751 | |
| 752 | ip = (struct ip *) buf; |
| 753 | hlen = ip->ip_hl << 2; |
| 754 | if (cc < hlen + ICMP_MINLEN) { |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 755 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 756 | if (verbose) |
| 757 | printf("packet too short (%d bytes) from %s\n", cc, |
| 758 | inet_ntoa(from->sin_addr)); |
| 759 | #endif |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 760 | return 0; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 761 | } |
| 762 | cc -= hlen; |
| 763 | icp = (struct icmp *)(buf + hlen); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 764 | type = icp->icmp_type; |
| 765 | code = icp->icmp_code; |
| 766 | /* Path MTU Discovery (RFC1191) */ |
| 767 | if (code != ICMP_UNREACH_NEEDFRAG) |
| 768 | pmtu = 0; |
| 769 | else { |
| 770 | pmtu = ntohs(icp->icmp_nextmtu); |
| 771 | } |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 772 | if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) || |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 773 | type == ICMP_UNREACH || type == ICMP_ECHOREPLY) { |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 774 | struct ip *hip; |
| 775 | struct udphdr *up; |
| 776 | |
| 777 | hip = &icp->icmp_ip; |
| 778 | hlen = hip->ip_hl << 2; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 779 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
| 780 | if (useicmp) { |
| 781 | struct icmp *hicmp; |
| 782 | |
| 783 | /* XXX */ |
| 784 | if (type == ICMP_ECHOREPLY && |
| 785 | icp->icmp_id == htons(ident) && |
| 786 | icp->icmp_seq == htons(seq)) |
| 787 | return -2; |
| 788 | |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 789 | hicmp = (struct icmp *)((unsigned char *)hip + hlen); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 790 | /* XXX 8 is a magic number */ |
| 791 | if (hlen + 8 <= cc && |
| 792 | hip->ip_p == IPPROTO_ICMP && |
| 793 | hicmp->icmp_id == htons(ident) && |
| 794 | hicmp->icmp_seq == htons(seq)) |
| 795 | return (type == ICMP_TIMXCEED ? -1 : code + 1); |
| 796 | } else |
| 797 | #endif |
| 798 | { |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 799 | up = (struct udphdr *)((unsigned char *)hip + hlen); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 800 | /* XXX 8 is a magic number */ |
| 801 | if (hlen + 12 <= cc && |
| 802 | hip->ip_p == IPPROTO_UDP && |
| 803 | up->source == htons(ident) && |
| 804 | up->dest == htons(port + seq)) |
| 805 | return (type == ICMP_TIMXCEED ? -1 : code + 1); |
| 806 | } |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 807 | } |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 808 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 809 | if (verbose) { |
| 810 | int i; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 811 | u_int32_t *lp = (u_int32_t *)&icp->icmp_ip; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 812 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 813 | printf("\n%d bytes from %s to " |
| 814 | "%s: icmp type %d (%s) code %d\n", |
| 815 | cc, inet_ntoa(from->sin_addr), |
| 816 | inet_ntoa(ip->ip_dst), type, pr_type(type), icp->icmp_code); |
| 817 | for (i = 4; i < cc ; i += sizeof(*lp)) |
| 818 | printf("%2d: x%8.8x\n", i, *lp++); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 819 | } |
| 820 | #endif |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 821 | return 0; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 822 | } |
| 823 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 824 | |
| 825 | /* |
| 826 | * Construct an Internet address representation. |
| 827 | * If the nflag has been supplied, give |
| 828 | * numeric value, otherwise try for symbolic name. |
| 829 | */ |
| 830 | static inline void |
| 831 | inetname(struct sockaddr_in *from) |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 832 | { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 833 | const char *n = NULL; |
| 834 | const char *ina; |
| 835 | char name[257]; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 836 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 837 | if (!nflag && from->sin_addr.s_addr != INADDR_ANY) { |
| 838 | if(INET_rresolve(name, sizeof(name), from, 0x4000, 0xffffffff) >= 0) |
| 839 | n = name; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 840 | } |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 841 | ina = inet_ntoa(from->sin_addr); |
| 842 | if (nflag) |
| 843 | printf(" %s", ina); |
| 844 | else |
| 845 | printf(" %s (%s)", (n ? n : ina), ina); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 846 | } |
| 847 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 848 | static inline void |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 849 | print(unsigned char *buf, int cc, struct sockaddr_in *from) |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 850 | { |
| 851 | struct ip *ip; |
| 852 | int hlen; |
| 853 | |
| 854 | ip = (struct ip *) buf; |
| 855 | hlen = ip->ip_hl << 2; |
| 856 | cc -= hlen; |
| 857 | |
| 858 | inetname(from); |
| 859 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE |
| 860 | if (verbose) |
| 861 | printf(" %d bytes to %s", cc, inet_ntoa (ip->ip_dst)); |
| 862 | #endif |
| 863 | } |
| 864 | |
| 865 | |
| 866 | static struct hostinfo * |
| 867 | gethostinfo(const char *host) |
| 868 | { |
| 869 | int n; |
| 870 | struct hostent *hp; |
| 871 | struct hostinfo *hi; |
| 872 | char **p; |
| 873 | u_int32_t addr, *ap; |
| 874 | |
Rob Landley | 081e384 | 2006-08-03 20:07:35 +0000 | [diff] [blame] | 875 | hi = xzalloc(sizeof(*hi)); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 876 | addr = inet_addr(host); |
| 877 | if ((int32_t)addr != -1) { |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 878 | hi->name = xstrdup(host); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 879 | hi->n = 1; |
Rob Landley | 081e384 | 2006-08-03 20:07:35 +0000 | [diff] [blame] | 880 | hi->addrs = xzalloc(sizeof(hi->addrs[0])); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 881 | hi->addrs[0] = addr; |
| 882 | return hi; |
| 883 | } |
| 884 | |
| 885 | hp = xgethostbyname(host); |
| 886 | if (hp->h_addrtype != AF_INET || hp->h_length != 4) |
| 887 | bb_perror_msg_and_die("bad host %s", host); |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 888 | hi->name = xstrdup(hp->h_name); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 889 | for (n = 0, p = hp->h_addr_list; *p != NULL; ++n, ++p) |
| 890 | continue; |
| 891 | hi->n = n; |
Rob Landley | 081e384 | 2006-08-03 20:07:35 +0000 | [diff] [blame] | 892 | hi->addrs = xzalloc(n * sizeof(hi->addrs[0])); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 893 | for (ap = hi->addrs, p = hp->h_addr_list; *p != NULL; ++ap, ++p) |
| 894 | memcpy(ap, *p, sizeof(*ap)); |
| 895 | return hi; |
| 896 | } |
| 897 | |
| 898 | static void |
| 899 | freehostinfo(struct hostinfo *hi) |
| 900 | { |
Rob Landley | e7c43b6 | 2006-03-01 16:39:45 +0000 | [diff] [blame] | 901 | free(hi->name); |
| 902 | hi->name = NULL; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 903 | free((char *)hi->addrs); |
| 904 | free((char *)hi); |
| 905 | } |
| 906 | |
| 907 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| 908 | static void |
| 909 | getaddr(u_int32_t *ap, const char *host) |
| 910 | { |
| 911 | struct hostinfo *hi; |
| 912 | |
| 913 | hi = gethostinfo(host); |
| 914 | *ap = hi->addrs[0]; |
| 915 | freehostinfo(hi); |
| 916 | } |
| 917 | #endif |
| 918 | |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 919 | |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 920 | int |
Aaron Lehmann | 7dd2cec | 2002-08-23 07:52:58 +0000 | [diff] [blame] | 921 | traceroute_main(int argc, char *argv[]) |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 922 | { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 923 | int code, n; |
| 924 | char *cp; |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 925 | unsigned char *outp; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 926 | u_int32_t *ap; |
| 927 | struct sockaddr_in *from = (struct sockaddr_in *)&wherefrom; |
| 928 | struct sockaddr_in *to = (struct sockaddr_in *)&whereto; |
| 929 | struct hostinfo *hi; |
| 930 | int on = 1; |
| 931 | struct protoent *pe; |
| 932 | int ttl, probe, i; |
| 933 | int seq = 0; |
| 934 | int tos = 0; |
| 935 | char *tos_str = NULL; |
| 936 | char *source = NULL; |
| 937 | unsigned long op; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 938 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 939 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| 940 | int lsrr = 0; |
| 941 | #endif |
| 942 | u_short off = 0; |
| 943 | struct IFADDRLIST *al; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 944 | char *device = NULL; |
| 945 | int max_ttl = 30; |
| 946 | char *max_ttl_str = NULL; |
| 947 | char *port_str = NULL; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 948 | int nprobes = 3; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 949 | char *nprobes_str = NULL; |
| 950 | char *waittime_str = NULL; |
| 951 | u_int pausemsecs = 0; |
| 952 | char *pausemsecs_str = NULL; |
| 953 | int first_ttl = 1; |
| 954 | char *first_ttl_str = NULL; |
| 955 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| 956 | llist_t *sourse_route_list = NULL; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 957 | #endif |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 958 | |
| 959 | opterr = 0; |
| 960 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
"Vladimir N. Oleynik" | f704b27 | 2005-10-14 09:56:52 +0000 | [diff] [blame] | 961 | bb_opt_complementally = "x-x:g::"; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 962 | #else |
| 963 | bb_opt_complementally = "x-x"; |
| 964 | #endif |
| 965 | |
| 966 | op = bb_getopt_ulflags(argc, argv, "FIlnrdvxt:i:m:p:q:s:w:z:f:" |
| 967 | #define USAGE_OP_DONT_FRAGMNT (1<<0) /* F */ |
| 968 | #define USAGE_OP_USE_ICMP (1<<1) /* I */ |
| 969 | #define USAGE_OP_TTL_FLAG (1<<2) /* l */ |
| 970 | #define USAGE_OP_ADDR_NUM (1<<3) /* n */ |
| 971 | #define USAGE_OP_BYPASS_ROUTE (1<<4) /* r */ |
| 972 | #define USAGE_OP_DEBUG (1<<5) /* d */ |
| 973 | #define USAGE_OP_VERBOSE (1<<6) /* v */ |
| 974 | #define USAGE_OP_IP_CHKSUM (1<<7) /* x */ |
| 975 | |
| 976 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| 977 | "g:" |
| 978 | #endif |
| 979 | , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str, |
| 980 | &source, &waittime_str, &pausemsecs_str, &first_ttl_str |
| 981 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| 982 | , &sourse_route_list |
| 983 | #endif |
| 984 | ); |
| 985 | |
| 986 | if(op & USAGE_OP_DONT_FRAGMNT) |
| 987 | off = IP_DF; |
| 988 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
| 989 | useicmp = op & USAGE_OP_USE_ICMP; |
| 990 | #endif |
| 991 | nflag = op & USAGE_OP_ADDR_NUM; |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 992 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 993 | verbose = op & USAGE_OP_VERBOSE; |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 994 | #endif |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 995 | if(op & USAGE_OP_IP_CHKSUM) { |
| 996 | doipcksum = 0; |
| 997 | bb_error_msg("Warning: ip checksums disabled"); |
| 998 | } |
| 999 | if (tos_str) |
| 1000 | tos = str2val(tos_str, "tos", 0, 255); |
| 1001 | if(max_ttl_str) |
| 1002 | max_ttl = str2val(max_ttl_str, "max ttl", 1, 255); |
| 1003 | if(port_str) |
| 1004 | port = (u_short)str2val(port_str, "port", 1, (1 << 16) - 1); |
| 1005 | if(nprobes_str) |
Bernhard Reutner-Fischer | 13068a4 | 2006-08-18 18:29:40 +0000 | [diff] [blame] | 1006 | nprobes = str2val(nprobes_str, "nprobes", 1, -1); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1007 | if(source) { |
| 1008 | /* |
| 1009 | * set the ip source address of the outbound |
| 1010 | * probe (e.g., on a multi-homed host). |
| 1011 | */ |
Rob Landley | afb94ec | 2006-07-16 08:06:34 +0000 | [diff] [blame] | 1012 | if (getuid()) bb_error_msg_and_die("-s %s: Permission denied", source); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1013 | } |
| 1014 | if(waittime_str) |
| 1015 | waittime = str2val(waittime_str, "wait time", 2, 24 * 60 * 60); |
| 1016 | if(pausemsecs_str) |
| 1017 | pausemsecs = str2val(pausemsecs_str, "pause msecs", 0, 60 * 60 * 1000); |
| 1018 | if(first_ttl_str) |
| 1019 | first_ttl = str2val(first_ttl_str, "first ttl", 1, 255); |
| 1020 | |
| 1021 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| 1022 | if(sourse_route_list) { |
| 1023 | llist_t *l_sr; |
| 1024 | |
| 1025 | for(l_sr = sourse_route_list; l_sr; ) { |
| 1026 | if (lsrr >= NGATEWAYS) |
| 1027 | bb_error_msg_and_die("No more than %d gateways", NGATEWAYS); |
| 1028 | getaddr(gwlist + lsrr, l_sr->data); |
| 1029 | ++lsrr; |
| 1030 | l_sr = l_sr->link; |
| 1031 | free(sourse_route_list); |
| 1032 | sourse_route_list = l_sr; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1033 | } |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1034 | optlen = (lsrr + 1) * sizeof(gwlist[0]); |
| 1035 | } |
| 1036 | #endif |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1037 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1038 | if (first_ttl > max_ttl) { |
| 1039 | bb_error_msg_and_die( |
| 1040 | "first ttl (%d) may not be greater than max ttl (%d)", |
| 1041 | first_ttl, max_ttl); |
| 1042 | } |
| 1043 | |
| 1044 | minpacket = sizeof(*outip) + sizeof(*outdata) + optlen; |
| 1045 | |
| 1046 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
| 1047 | if (useicmp) |
| 1048 | minpacket += 8; /* XXX magic number */ |
| 1049 | else |
| 1050 | #endif |
| 1051 | minpacket += sizeof(*outudp); |
| 1052 | packlen = minpacket; /* minimum sized packet */ |
| 1053 | |
| 1054 | /* Process destination and optional packet size */ |
| 1055 | switch (argc - optind) { |
| 1056 | |
| 1057 | case 2: |
| 1058 | packlen = str2val(argv[optind + 1], |
| 1059 | "packet length", minpacket, maxpacket); |
| 1060 | /* Fall through */ |
| 1061 | |
| 1062 | case 1: |
| 1063 | hostname = argv[optind]; |
| 1064 | hi = gethostinfo(hostname); |
| 1065 | setsin(to, hi->addrs[0]); |
| 1066 | if (hi->n > 1) |
| 1067 | bb_error_msg( |
| 1068 | "Warning: %s has multiple addresses; using %s", |
| 1069 | hostname, inet_ntoa(to->sin_addr)); |
| 1070 | hostname = hi->name; |
| 1071 | hi->name = NULL; |
| 1072 | freehostinfo(hi); |
| 1073 | break; |
| 1074 | |
| 1075 | default: |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1076 | bb_show_usage(); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1077 | } |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1078 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1079 | cp = "icmp"; |
| 1080 | if ((pe = getprotobyname(cp)) == NULL) |
| 1081 | bb_perror_msg_and_die("unknown protocol %s", cp); |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1082 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1083 | /* Insure the socket fds won't be 0, 1 or 2 */ |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 1084 | do n = xopen(bb_dev_null, O_RDONLY); while (n < 2); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1085 | if (n > 2) |
| 1086 | close(n); |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1087 | |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 1088 | s = xsocket(AF_INET, SOCK_RAW, pe->p_proto); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 1089 | |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 1090 | #ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1091 | if (op & USAGE_OP_DEBUG) |
| 1092 | (void)setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&on, |
| 1093 | sizeof(on)); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 1094 | #endif |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1095 | if (op & USAGE_OP_BYPASS_ROUTE) |
| 1096 | (void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, (char *)&on, |
| 1097 | sizeof(on)); |
| 1098 | |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 1099 | sndsock = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1100 | |
| 1101 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE |
| 1102 | #if defined(IP_OPTIONS) |
| 1103 | if (lsrr > 0) { |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 1104 | unsigned char optlist[MAX_IPOPTLEN]; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1105 | |
| 1106 | cp = "ip"; |
| 1107 | if ((pe = getprotobyname(cp)) == NULL) |
| 1108 | bb_perror_msg_and_die("unknown protocol"); |
| 1109 | |
| 1110 | /* final hop */ |
| 1111 | gwlist[lsrr] = to->sin_addr.s_addr; |
| 1112 | ++lsrr; |
| 1113 | |
| 1114 | /* force 4 byte alignment */ |
| 1115 | optlist[0] = IPOPT_NOP; |
| 1116 | /* loose source route option */ |
| 1117 | optlist[1] = IPOPT_LSRR; |
| 1118 | i = lsrr * sizeof(gwlist[0]); |
| 1119 | optlist[2] = i + 3; |
| 1120 | /* Pointer to LSRR addresses */ |
| 1121 | optlist[3] = IPOPT_MINOFF; |
| 1122 | memcpy(optlist + 4, gwlist, i); |
| 1123 | |
| 1124 | if ((setsockopt(sndsock, pe->p_proto, IP_OPTIONS, |
| 1125 | (char *)optlist, i + sizeof(gwlist[0]))) < 0) { |
| 1126 | bb_perror_msg_and_die("IP_OPTIONS"); |
| 1127 | } |
| 1128 | } |
| 1129 | #endif /* IP_OPTIONS */ |
| 1130 | #endif /* CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE */ |
| 1131 | |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1132 | #ifdef SO_SNDBUF |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1133 | if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&packlen, |
| 1134 | sizeof(packlen)) < 0) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1135 | bb_perror_msg_and_die("SO_SNDBUF"); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1136 | } |
Eric Andersen | ad79c0b | 2002-06-06 12:24:51 +0000 | [diff] [blame] | 1137 | #endif |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1138 | #ifdef IP_HDRINCL |
| 1139 | if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, (char *)&on, |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1140 | sizeof(on)) < 0 && errno != ENOPROTOOPT) { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 1141 | bb_perror_msg_and_die("IP_HDRINCL"); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1142 | } |
| 1143 | #else |
| 1144 | #ifdef IP_TOS |
| 1145 | if (tos_str && setsockopt(sndsock, IPPROTO_IP, IP_TOS, |
| 1146 | (char *)&tos, sizeof(tos)) < 0) { |
| 1147 | bb_perror_msg_and_die("setsockopt tos %d", tos); |
| 1148 | } |
| 1149 | #endif |
Eric Andersen | ad79c0b | 2002-06-06 12:24:51 +0000 | [diff] [blame] | 1150 | #endif |
Eric Andersen | bdfd0d7 | 2001-10-24 05:00:29 +0000 | [diff] [blame] | 1151 | #ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1152 | if (op & USAGE_OP_DEBUG) |
| 1153 | (void)setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, (char *)&on, |
| 1154 | sizeof(on)); |
Eric Andersen | 7467c8d | 2001-07-12 20:26:32 +0000 | [diff] [blame] | 1155 | #endif |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1156 | if (op & USAGE_OP_BYPASS_ROUTE) |
| 1157 | (void)setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, (char *)&on, |
| 1158 | sizeof(on)); |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1159 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1160 | /* Revert to non-privileged user after opening sockets */ |
Rob Landley | afb94ec | 2006-07-16 08:06:34 +0000 | [diff] [blame] | 1161 | xsetgid(getgid()); |
| 1162 | xsetuid(getuid()); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1163 | |
Rob Landley | 081e384 | 2006-08-03 20:07:35 +0000 | [diff] [blame] | 1164 | outip = (struct ip *)xzalloc(packlen); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1165 | |
| 1166 | outip->ip_v = IPVERSION; |
| 1167 | if (tos_str) |
| 1168 | outip->ip_tos = tos; |
| 1169 | outip->ip_len = htons(packlen); |
| 1170 | outip->ip_off = htons(off); |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 1171 | outp = (unsigned char *)(outip + 1); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1172 | outip->ip_dst = to->sin_addr; |
| 1173 | |
Mike Frysinger | 294254c | 2006-02-19 22:59:12 +0000 | [diff] [blame] | 1174 | outip->ip_hl = (outp - (unsigned char *)outip) >> 2; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1175 | ident = (getpid() & 0xffff) | 0x8000; |
| 1176 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP |
| 1177 | if (useicmp) { |
| 1178 | outip->ip_p = IPPROTO_ICMP; |
| 1179 | |
| 1180 | outicmp = (struct icmp *)outp; |
| 1181 | outicmp->icmp_type = ICMP_ECHO; |
| 1182 | outicmp->icmp_id = htons(ident); |
| 1183 | |
| 1184 | outdata = (struct outdata *)(outp + 8); /* XXX magic number */ |
| 1185 | } else |
Eric Andersen | ad79c0b | 2002-06-06 12:24:51 +0000 | [diff] [blame] | 1186 | #endif |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1187 | { |
| 1188 | outip->ip_p = IPPROTO_UDP; |
| 1189 | |
| 1190 | outudp = (struct udphdr *)outp; |
| 1191 | outudp->source = htons(ident); |
| 1192 | outudp->len = |
| 1193 | htons((u_short)(packlen - (sizeof(*outip) + optlen))); |
| 1194 | outdata = (struct outdata *)(outudp + 1); |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1195 | } |
| 1196 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1197 | /* Get the interface address list */ |
| 1198 | n = ifaddrlist(&al); |
| 1199 | |
| 1200 | /* Look for a specific device */ |
| 1201 | if (device != NULL) { |
| 1202 | for (i = n; i > 0; --i, ++al) |
| 1203 | if (strcmp(device, al->device) == 0) |
| 1204 | break; |
| 1205 | if (i <= 0) { |
| 1206 | bb_error_msg_and_die("Can't find interface %s", device); |
| 1207 | } |
| 1208 | } |
| 1209 | |
| 1210 | /* Determine our source address */ |
| 1211 | if (source == NULL) { |
| 1212 | /* |
| 1213 | * If a device was specified, use the interface address. |
| 1214 | * Otherwise, try to determine our source address. |
| 1215 | */ |
| 1216 | if (device != NULL) |
| 1217 | setsin(from, al->addr); |
| 1218 | findsaddr(to, from); |
| 1219 | } else { |
| 1220 | hi = gethostinfo(source); |
| 1221 | source = hi->name; |
| 1222 | hi->name = NULL; |
| 1223 | /* |
| 1224 | * If the device was specified make sure it |
| 1225 | * corresponds to the source address specified. |
| 1226 | * Otherwise, use the first address (and warn if |
| 1227 | * there are more than one). |
| 1228 | */ |
| 1229 | if (device != NULL) { |
| 1230 | for (i = hi->n, ap = hi->addrs; i > 0; --i, ++ap) |
| 1231 | if (*ap == al->addr) |
| 1232 | break; |
| 1233 | if (i <= 0) { |
| 1234 | bb_error_msg_and_die( |
| 1235 | "%s is not on interface %s", |
| 1236 | source, device); |
| 1237 | } |
| 1238 | setsin(from, *ap); |
| 1239 | } else { |
| 1240 | setsin(from, hi->addrs[0]); |
| 1241 | if (hi->n > 1) |
| 1242 | bb_error_msg( |
| 1243 | "Warning: %s has multiple addresses; using %s", |
| 1244 | source, inet_ntoa(from->sin_addr)); |
| 1245 | } |
| 1246 | freehostinfo(hi); |
| 1247 | } |
| 1248 | |
| 1249 | outip->ip_src = from->sin_addr; |
| 1250 | #ifndef IP_HDRINCL |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 1251 | xbind(sndsock, (struct sockaddr *)from, sizeof(*from)); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1252 | #endif |
| 1253 | |
| 1254 | fprintf(stderr, "traceroute to %s (%s)", hostname, inet_ntoa(to->sin_addr)); |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1255 | if (source) |
| 1256 | fprintf(stderr, " from %s", source); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1257 | fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, packlen); |
| 1258 | (void)fflush(stderr); |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1259 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1260 | for (ttl = first_ttl; ttl <= max_ttl; ++ttl) { |
| 1261 | u_int32_t lastaddr = 0; |
| 1262 | int gotlastaddr = 0; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1263 | int got_there = 0; |
| 1264 | int unreachable = 0; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1265 | int sentfirst = 0; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1266 | |
| 1267 | printf("%2d ", ttl); |
| 1268 | for (probe = 0; probe < nprobes; ++probe) { |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1269 | int cc; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1270 | struct timeval t1, t2; |
| 1271 | struct timezone tz; |
| 1272 | struct ip *ip; |
| 1273 | |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1274 | if (sentfirst && pausemsecs > 0) |
| 1275 | usleep(pausemsecs * 1000); |
| 1276 | (void)gettimeofday(&t1, &tz); |
| 1277 | send_probe(++seq, ttl, &t1); |
| 1278 | ++sentfirst; |
| 1279 | while ((cc = wait_for_reply(s, from, &t1)) != 0) { |
| 1280 | (void)gettimeofday(&t2, &tz); |
| 1281 | i = packet_ok(packet, cc, from, seq); |
| 1282 | /* Skip short packet */ |
| 1283 | if (i == 0) |
| 1284 | continue; |
| 1285 | if (!gotlastaddr || |
| 1286 | from->sin_addr.s_addr != lastaddr) { |
| 1287 | print(packet, cc, from); |
| 1288 | lastaddr = from->sin_addr.s_addr; |
| 1289 | ++gotlastaddr; |
| 1290 | } |
| 1291 | printf(" %.3f ms", deltaT(&t1, &t2)); |
| 1292 | ip = (struct ip *)packet; |
| 1293 | if (op & USAGE_OP_TTL_FLAG) |
| 1294 | printf(" (%d)", ip->ip_ttl); |
| 1295 | if (i == -2) { |
| 1296 | if (ip->ip_ttl <= 1) |
| 1297 | printf(" !"); |
| 1298 | ++got_there; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1299 | break; |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1300 | } |
| 1301 | /* time exceeded in transit */ |
| 1302 | if (i == -1) |
| 1303 | break; |
| 1304 | code = i - 1; |
| 1305 | switch (code) { |
| 1306 | |
| 1307 | case ICMP_UNREACH_PORT: |
| 1308 | if (ip->ip_ttl <= 1) |
| 1309 | printf(" !"); |
| 1310 | ++got_there; |
| 1311 | break; |
| 1312 | |
| 1313 | case ICMP_UNREACH_NET: |
| 1314 | ++unreachable; |
| 1315 | printf(" !N"); |
| 1316 | break; |
| 1317 | |
| 1318 | case ICMP_UNREACH_HOST: |
| 1319 | ++unreachable; |
| 1320 | printf(" !H"); |
| 1321 | break; |
| 1322 | |
| 1323 | case ICMP_UNREACH_PROTOCOL: |
| 1324 | ++got_there; |
| 1325 | printf(" !P"); |
| 1326 | break; |
| 1327 | |
| 1328 | case ICMP_UNREACH_NEEDFRAG: |
| 1329 | ++unreachable; |
| 1330 | printf(" !F-%d", pmtu); |
| 1331 | break; |
| 1332 | |
| 1333 | case ICMP_UNREACH_SRCFAIL: |
| 1334 | ++unreachable; |
| 1335 | printf(" !S"); |
| 1336 | break; |
| 1337 | |
| 1338 | case ICMP_UNREACH_FILTER_PROHIB: |
| 1339 | case ICMP_UNREACH_NET_PROHIB: /* misuse */ |
| 1340 | ++unreachable; |
| 1341 | printf(" !A"); |
| 1342 | break; |
| 1343 | |
| 1344 | case ICMP_UNREACH_HOST_PROHIB: |
| 1345 | ++unreachable; |
| 1346 | printf(" !C"); |
| 1347 | break; |
| 1348 | |
| 1349 | case ICMP_UNREACH_HOST_PRECEDENCE: |
| 1350 | ++unreachable; |
| 1351 | printf(" !V"); |
| 1352 | break; |
| 1353 | |
| 1354 | case ICMP_UNREACH_PRECEDENCE_CUTOFF: |
| 1355 | ++unreachable; |
| 1356 | printf(" !C"); |
| 1357 | break; |
| 1358 | |
| 1359 | case ICMP_UNREACH_NET_UNKNOWN: |
| 1360 | case ICMP_UNREACH_HOST_UNKNOWN: |
| 1361 | ++unreachable; |
| 1362 | printf(" !U"); |
| 1363 | break; |
| 1364 | |
| 1365 | case ICMP_UNREACH_ISOLATED: |
| 1366 | ++unreachable; |
| 1367 | printf(" !I"); |
| 1368 | break; |
| 1369 | |
| 1370 | case ICMP_UNREACH_TOSNET: |
| 1371 | case ICMP_UNREACH_TOSHOST: |
| 1372 | ++unreachable; |
| 1373 | printf(" !T"); |
| 1374 | break; |
| 1375 | |
| 1376 | default: |
| 1377 | ++unreachable; |
| 1378 | printf(" !<%d>", code); |
| 1379 | break; |
| 1380 | } |
| 1381 | break; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1382 | } |
| 1383 | if (cc == 0) |
| 1384 | printf(" *"); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1385 | (void)fflush(stdout); |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1386 | } |
| 1387 | putchar('\n'); |
"Vladimir N. Oleynik" | 45a8ed8 | 2005-09-06 16:08:33 +0000 | [diff] [blame] | 1388 | if (got_there || |
| 1389 | (unreachable > 0 && unreachable >= nprobes - 1)) |
| 1390 | break; |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1391 | } |
Eric Andersen | 5c58d28 | 2001-07-10 16:29:00 +0000 | [diff] [blame] | 1392 | return 0; |
| 1393 | } |