| /* vi: set sw=4 ts=4: */ |
| /* |
| * Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Busybox port by Vladimir Oleynik (C) 2005 <dzo@simtreas.ru> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code distributions |
| * retain the above copyright notice and this paragraph in its entirety, (2) |
| * distributions including binary code include the above copyright notice and |
| * this paragraph in its entirety in the documentation or other materials |
| * provided with the distribution, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ''This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| * the University nor the names of its contributors may be used to endorse |
| * or promote products derived from this software without specific prior |
| * written permission. |
| * THIS SOFTWARE IS PROVIDED ''AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| */ |
| |
| /* |
| * traceroute6 |
| * |
| * Modified for NRL 4.4BSD IPv6 release. |
| * 07/31/96 bgp |
| * |
| * Modified for Linux IPv6 by Pedro Roque <roque@di.fc.ul.pt> |
| * 31/07/1996 |
| * |
| * As ICMP error messages for IPv6 now include more than 8 bytes |
| * UDP datagrams are now sent via an UDP socket instead of magic |
| * RAW socket tricks. |
| * |
| * Converted to busybox applet by Leonid Lisovskiy <lly@sf.net> |
| * 2009-11-16 |
| */ |
| |
| /* |
| * traceroute host - trace the route ip packets follow going to "host". |
| * |
| * Attempt to trace the route an ip packet would follow to some |
| * internet host. We find out intermediate hops by launching probe |
| * packets with a small ttl (time to live) then listening for an |
| * icmp "time exceeded" reply from a gateway. We start our probes |
| * with a ttl of one and increase by one until we get an icmp "port |
| * unreachable" (which means we got to "host") or hit a max (which |
| * defaults to 30 hops & can be changed with the -m flag). Three |
| * probes (change with -q flag) are sent at each ttl setting and a |
| * line is printed showing the ttl, address of the gateway and |
| * round trip time of each probe. If the probe answers come from |
| * different gateways, the address of each responding system will |
| * be printed. If there is no response within a 5 sec. timeout |
| * interval (changed with the -w flag), a "*" is printed for that |
| * probe. |
| * |
| * Probe packets are UDP format. We don't want the destination |
| * host to process them so the destination port is set to an |
| * unlikely value (if some clod on the destination is using that |
| * value, it can be changed with the -p flag). |
| * |
| * A sample use might be: |
| * |
| * [yak 71]% traceroute nis.nsf.net. |
| * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet |
| * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms |
| * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms |
| * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms |
| * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms |
| * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms |
| * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms |
| * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms |
| * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms |
| * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms |
| * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms |
| * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms |
| * |
| * Note that lines 2 & 3 are the same. This is due to a buggy |
| * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards |
| * packets with a zero ttl. |
| * |
| * A more interesting example is: |
| * |
| * [yak 72]% traceroute allspice.lcs.mit.edu. |
| * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max |
| * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms |
| * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms |
| * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms |
| * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms |
| * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms |
| * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms |
| * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms |
| * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms |
| * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms |
| * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms |
| * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms |
| * 12 * * * |
| * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms |
| * 14 * * * |
| * 15 * * * |
| * 16 * * * |
| * 17 * * * |
| * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms |
| * |
| * (I start to see why I'm having so much trouble with mail to |
| * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away |
| * either don't send ICMP "time exceeded" messages or send them |
| * with a ttl too small to reach us. 14 - 17 are running the |
| * MIT C Gateway code that doesn't send "time exceeded"s. God |
| * only knows what's going on with 12. |
| * |
| * The silent gateway 12 in the above may be the result of a bug in |
| * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) |
| * sends an unreachable message using whatever ttl remains in the |
| * original datagram. Since, for gateways, the remaining ttl is |
| * zero, the icmp "time exceeded" is guaranteed to not make it back |
| * to us. The behavior of this bug is slightly more interesting |
| * when it appears on the destination system: |
| * |
| * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms |
| * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms |
| * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms |
| * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms |
| * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms |
| * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms |
| * 7 * * * |
| * 8 * * * |
| * 9 * * * |
| * 10 * * * |
| * 11 * * * |
| * 12 * * * |
| * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! |
| * |
| * Notice that there are 12 "gateways" (13 is the final |
| * destination) and exactly the last half of them are "missing". |
| * What's really happening is that rip (a Sun-3 running Sun OS3.5) |
| * is using the ttl from our arriving datagram as the ttl in its |
| * icmp reply. So, the reply will time out on the return path |
| * (with no notice sent to anyone since icmp's aren't sent for |
| * icmp's) until we probe with a ttl that's at least twice the path |
| * length. I.e., rip is really only 7 hops away. A reply that |
| * returns with a ttl of 1 is a clue this problem exists. |
| * Traceroute prints a "!" after the time if the ttl is <= 1. |
| * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or |
| * non-standard (HPUX) software, expect to see this problem |
| * frequently and/or take care picking the target host of your |
| * probes. |
| * |
| * Other possible annotations after the time are !H, !N, !P (got a host, |
| * network or protocol unreachable, respectively), !S or !F (source |
| * route failed or fragmentation needed -- neither of these should |
| * ever occur and the associated gateway is busted if you see one). If |
| * almost all the probes result in some kind of unreachable, traceroute |
| * will give up and exit. |
| * |
| * Notes |
| * ----- |
| * This program must be run by root or be setuid. (I suggest that |
| * you *don't* make it setuid -- casual use could result in a lot |
| * of unnecessary traffic on our poor, congested nets.) |
| * |
| * This program requires a kernel mod that does not appear in any |
| * system available from Berkeley: A raw ip socket using proto |
| * IPPROTO_RAW must interpret the data sent as an ip datagram (as |
| * opposed to data to be wrapped in a ip datagram). See the README |
| * file that came with the source to this program for a description |
| * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may |
| * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE |
| * MODIFIED TO RUN THIS PROGRAM. |
| * |
| * The udp port usage may appear bizarre (well, ok, it is bizarre). |
| * The problem is that an icmp message only contains 8 bytes of |
| * data from the original datagram. 8 bytes is the size of a udp |
| * header so, if we want to associate replies with the original |
| * datagram, the necessary information must be encoded into the |
| * udp header (the ip id could be used but there's no way to |
| * interlock with the kernel's assignment of ip id's and, anyway, |
| * it would have taken a lot more kernel hacking to allow this |
| * code to set the ip id). So, to allow two or more users to |
| * use traceroute simultaneously, we use this task's pid as the |
| * source port (the high bit is set to move the port number out |
| * of the "likely" range). To keep track of which probe is being |
| * replied to (so times and/or hop counts don't get confused by a |
| * reply that was delayed in transit), we increment the destination |
| * port number before each probe. |
| * |
| * Don't use this as a coding example. I was trying to find a |
| * routing problem and this code sort-of popped out after 48 hours |
| * without sleep. I was amazed it ever compiled, much less ran. |
| * |
| * I stole the idea for this program from Steve Deering. Since |
| * the first release, I've learned that had I attended the right |
| * IETF working group meetings, I also could have stolen it from Guy |
| * Almes or Matt Mathis. I don't know (or care) who came up with |
| * the idea first. I envy the originators' perspicacity and I'm |
| * glad they didn't keep the idea a secret. |
| * |
| * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or |
| * enhancements to the original distribution. |
| * |
| * I've hacked up a round-trip-route version of this that works by |
| * sending a loose-source-routed udp datagram through the destination |
| * back to yourself. Unfortunately, SO many gateways botch source |
| * routing, the thing is almost worthless. Maybe one day... |
| * |
| * -- Van Jacobson (van@ee.lbl.gov) |
| * Tue Dec 20 03:50:13 PST 1988 |
| */ |
| //config:config TRACEROUTE |
| //config: bool "traceroute (11 kb)" |
| //config: default y |
| //config: help |
| //config: Utility to trace the route of IP packets. |
| //config: |
| //config:config TRACEROUTE6 |
| //config: bool "traceroute6 (13 kb)" |
| //config: default y |
| //config: depends on FEATURE_IPV6 |
| //config: help |
| //config: Utility to trace the route of IPv6 packets. |
| //config: |
| //config:config FEATURE_TRACEROUTE_VERBOSE |
| //config: bool "Enable verbose output" |
| //config: default y |
| //config: depends on TRACEROUTE || TRACEROUTE6 |
| //config: help |
| //config: Add some verbosity to traceroute. This includes among other things |
| //config: hostnames and ICMP response types. |
| //config: |
| //config:config FEATURE_TRACEROUTE_USE_ICMP |
| //config: bool "Enable -I option (use ICMP instead of UDP)" |
| //config: default y |
| //config: depends on TRACEROUTE || TRACEROUTE6 |
| |
| /* Needs socket(AF_INET, SOCK_RAW, IPPROTO_ICMP), therefore BB_SUID_MAYBE: */ |
| //applet:IF_TRACEROUTE(APPLET(traceroute, BB_DIR_USR_BIN, BB_SUID_MAYBE)) |
| //applet:IF_TRACEROUTE6(APPLET(traceroute6, BB_DIR_USR_BIN, BB_SUID_MAYBE)) |
| |
| //kbuild:lib-$(CONFIG_TRACEROUTE) += traceroute.o |
| //kbuild:lib-$(CONFIG_TRACEROUTE6) += traceroute.o |
| |
| //usage:#define traceroute_trivial_usage |
| //usage: "[-"IF_TRACEROUTE6("46")IF_FEATURE_TRACEROUTE_USE_ICMP("I")"Flnrv] [-f 1ST_TTL] [-m MAXTTL] [-q PROBES] [-p PORT]\n" |
| //usage: " [-t TOS] [-w WAIT_SEC] [-s SRC_IP] [-i IFACE]\n" |
| //usage: " [-z PAUSE_MSEC] HOST [BYTES]" |
| //usage:#define traceroute_full_usage "\n\n" |
| //usage: "Trace the route to HOST\n" |
| //usage: IF_TRACEROUTE6( |
| //usage: "\n -4,-6 Force IP or IPv6 name resolution" |
| //usage: ) |
| //usage: "\n -F Set don't fragment bit" |
| //usage: IF_FEATURE_TRACEROUTE_USE_ICMP( |
| //usage: "\n -I Use ICMP ECHO instead of UDP datagrams" |
| //usage: ) |
| //usage: "\n -l Display TTL value of the returned packet" |
| //Currently disabled (TRACEROUTE_SO_DEBUG==0) |
| ////usage: "\n -d Set SO_DEBUG options to socket" |
| //usage: "\n -n Print numeric addresses" |
| //usage: "\n -r Bypass routing tables, send directly to HOST" |
| //usage: IF_FEATURE_TRACEROUTE_VERBOSE( |
| //usage: "\n -v Verbose" |
| //usage: ) |
| //usage: "\n -f N First number of hops (default 1)" |
| //usage: "\n -m N Max number of hops" |
| //usage: "\n -q N Number of probes per hop (default 3)" |
| //usage: "\n -p N Base UDP port number used in probes" |
| //usage: "\n (default 33434)" |
| //usage: "\n -s IP Source address" |
| //usage: "\n -i IFACE Source interface" |
| //usage: "\n -t N Type-of-service in probe packets (default 0)" |
| //usage: "\n -w SEC Wait for a response (default 3)" |
| //usage: "\n -z MSEC Wait before each send" |
| //usage: |
| //usage:#define traceroute6_trivial_usage |
| //usage: "[-"IF_FEATURE_TRACEROUTE_USE_ICMP("I")"nrv] [-f 1ST_TTL] [-m MAXTTL] [-q PROBES] [-p PORT]\n" |
| //usage: " [-t TOS] [-w WAIT_SEC] [-s SRC_IP] [-i IFACE]\n" |
| //usage: " [-z PAUSE_MSEC] HOST [BYTES]" |
| //usage:#define traceroute6_full_usage "\n\n" |
| //usage: "Trace the route to HOST\n" |
| ////NOP? "\n -F Set don't fragment bit" |
| //usage: IF_FEATURE_TRACEROUTE_USE_ICMP( |
| //usage: "\n -I Use ICMP ECHO instead of UDP datagrams" |
| //usage: ) |
| ////NOP: "\n -l Display TTL value of the returned packet" |
| //Currently disabled (TRACEROUTE_SO_DEBUG==0) |
| ////usage: "\n -d Set SO_DEBUG options to socket" |
| //usage: "\n -n Print numeric addresses" |
| //usage: "\n -r Bypass routing tables, send directly to HOST" |
| //usage: IF_FEATURE_TRACEROUTE_VERBOSE( |
| //usage: "\n -v Verbose" |
| //usage: ) |
| //usage: "\n -f N First number of hops (default 1)" |
| //usage: "\n -m N Max number of hops" |
| //usage: "\n -q N Number of probes per hop (default 3)" |
| //usage: "\n -p N Base UDP port number used in probes" |
| //usage: "\n (default 33434)" |
| //usage: "\n -s IP Source address" |
| //usage: "\n -i IFACE Source interface" |
| //usage: "\n -t N Type-of-service in probe packets (default 0)" |
| //usage: "\n -w SEC Wait for a response (default 3)" |
| //usage: "\n -z MSEC Wait before each send" |
| |
| #define TRACEROUTE_SO_DEBUG 0 |
| |
| #include <net/if.h> |
| #include <arpa/inet.h> |
| #include <netinet/in.h> |
| #include <netinet/udp.h> |
| #include <netinet/ip.h> |
| #include <netinet/ip_icmp.h> |
| #if ENABLE_FEATURE_IPV6 |
| # include <netinet/ip6.h> |
| # include <netinet/icmp6.h> |
| # ifndef SOL_IPV6 |
| # define SOL_IPV6 IPPROTO_IPV6 |
| # endif |
| # if defined(IPV6_PKTINFO) && !defined(IPV6_RECVPKTINFO) |
| # define IPV6_RECVPKTINFO IPV6_PKTINFO |
| # endif |
| #endif |
| |
| #include "libbb.h" |
| #include "inet_common.h" |
| |
| #ifndef IPPROTO_ICMP |
| # define IPPROTO_ICMP 1 |
| #endif |
| #ifndef IPPROTO_IP |
| # define IPPROTO_IP 0 |
| #endif |
| /* Some operating systems, like GNU/Hurd, don't define SOL_RAW, but do have |
| * IPPROTO_RAW. Since the IPPROTO definitions are also valid to use for |
| * setsockopt (and take the same value as their corresponding SOL definitions, |
| * if they exist), we can just fall back on IPPROTO_RAW. */ |
| #ifndef SOL_RAW |
| # define SOL_RAW IPPROTO_RAW |
| #endif |
| |
| |
| #define OPT_STRING \ |
| "FIlnrdvt:i:m:p:q:s:w:z:f:" \ |
| "4" IF_TRACEROUTE6("6") |
| enum { |
| OPT_DONT_FRAGMNT = (1 << 0), /* F */ |
| OPT_USE_ICMP = (1 << 1) * ENABLE_FEATURE_TRACEROUTE_USE_ICMP, /* I */ |
| OPT_TTL_FLAG = (1 << 2), /* l */ |
| OPT_ADDR_NUM = (1 << 3), /* n */ |
| OPT_BYPASS_ROUTE = (1 << 4), /* r */ |
| OPT_DEBUG = (1 << 5), /* d */ |
| OPT_VERBOSE = (1 << 6) * ENABLE_FEATURE_TRACEROUTE_VERBOSE, /* v */ |
| OPT_TOS = (1 << 7), /* t */ |
| OPT_DEVICE = (1 << 8), /* i */ |
| OPT_MAX_TTL = (1 << 9), /* m */ |
| OPT_PORT = (1 << 10), /* p */ |
| OPT_NPROBES = (1 << 11), /* q */ |
| OPT_SOURCE = (1 << 12), /* s */ |
| OPT_WAITTIME = (1 << 13), /* w */ |
| OPT_PAUSE_MS = (1 << 14), /* z */ |
| OPT_FIRST_TTL = (1 << 15), /* f */ |
| OPT_IPV4 = (1 << 16), /* 4 */ |
| OPT_IPV6 = (1 << 17) * ENABLE_TRACEROUTE6, /* 6 */ |
| }; |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| # define verbose (option_mask32 & OPT_VERBOSE) |
| #else |
| # define verbose 0 |
| #endif |
| |
| enum { |
| SIZEOF_ICMP_HDR = 8, |
| rcvsock = 3, /* receive (icmp) socket file descriptor */ |
| sndsock = 4, /* send (udp/icmp) socket file descriptor */ |
| }; |
| |
| /* Data section of the probe packet */ |
| struct outdata_t { |
| unsigned char seq; /* sequence number of this packet */ |
| unsigned char ttl; /* ttl packet left with */ |
| // UNUSED. Retaining to have the same packet size. |
| struct timeval tv_UNUSED PACKED; /* time packet left */ |
| }; |
| |
| #if ENABLE_TRACEROUTE6 |
| struct outdata6_t { |
| uint32_t ident6; |
| uint32_t seq6; |
| struct timeval tv_UNUSED PACKED; /* time packet left */ |
| }; |
| #endif |
| |
| struct globals { |
| /* Pointer to entire malloced IP packet, "packlen" bytes long: */ |
| struct ip *outip; |
| /* Pointer to ICMP or UDP payload (not header): */ |
| struct outdata_t *outdata; |
| len_and_sockaddr *dest_lsa; |
| len_and_sockaddr *from_lsa; /* response came from this address */ |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| struct sockaddr *to; /* response came to this (local) address */ |
| #endif |
| uint32_t ident; |
| uint16_t port; /* start udp dest port # for probe packets */ |
| #if ENABLE_TRACEROUTE6 |
| smallint ipv6; |
| # define G_ipv6 G.ipv6 |
| #else |
| # define G_ipv6 0 |
| #endif |
| int packlen; /* total length of packet */ |
| int pmtu; /* Path MTU Discovery (RFC1191) */ |
| int waittime; /* time to wait for response (in seconds) */ |
| int first_ttl; |
| int nprobes; |
| int max_ttl; |
| unsigned pausemsecs; |
| unsigned char recv_pkt[512]; /* last inbound (icmp) packet */ |
| }; |
| |
| #define G (*ptr_to_globals) |
| #define outip (G.outip ) |
| #define outdata (G.outdata ) |
| #define dest_lsa (G.dest_lsa ) |
| #define packlen (G.packlen ) |
| #define pmtu (G.pmtu ) |
| #define ident (G.ident ) |
| #define port (G.port ) |
| #define waittime (G.waittime ) |
| #define recv_pkt (G.recv_pkt ) |
| #define INIT_G() do { \ |
| SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ |
| } while (0) |
| |
| #define outudp ((struct udphdr *)(outip + 1)) |
| #define outudp6 ((struct udphdr *)(((struct ip6_hdr*)outip) + 1)) |
| #define outicmp ((struct icmp *)(outip + 1)) |
| #define outicmp6 ((struct icmp *)(((struct ip6_hdr*)outip) + 1)) |
| /* NB: for icmp echo, IPv4 and IPv6 fields are the same size and offset: |
| * struct icmp: |
| * uint8_t icmp_type; |
| * uint8_t icmp_code; |
| * uint16_t icmp_cksum; |
| * uint16_t icmp_id; |
| * uint16_t icmp_seq; |
| * struct icmp6_hdr: |
| * uint8_t icmp6_type; |
| * uint8_t icmp6_code; |
| * uint16_t icmp6_cksum; |
| * uint16_t icmp6_id; |
| * uint16_t icmp6_seq; |
| * therefore both outicmp and outicmp6 are pointers to *IPv4* icmp struct. |
| * SIZEOF_ICMP_HDR == 8 is the same for both, as well. |
| * However, values of these pointers are not the same (since IPv6 IP header is larger), |
| * and icmp_type constants are not the same: |
| * #define ICMP_ECHO 8 |
| * #define ICMP_ECHOREPLY 0 |
| * #define ICMP6_ECHO_REQUEST 128 |
| * #define ICMP6_ECHO_REPLY 129 |
| */ |
| |
| static int |
| wait_for_reply(unsigned *timestamp_us, int *left_ms) |
| { |
| struct pollfd pfd[1]; |
| int read_len = 0; |
| |
| pfd[0].fd = rcvsock; |
| pfd[0].events = POLLIN; |
| if (*left_ms >= 0 && safe_poll(pfd, 1, *left_ms) > 0) { |
| unsigned t; |
| |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| read_len = recv_from_to(rcvsock, |
| recv_pkt, sizeof(recv_pkt), |
| /*flags:*/ MSG_DONTWAIT, |
| &G.from_lsa->u.sa, G.to, G.from_lsa->len); |
| #else |
| read_len = recvfrom(rcvsock, |
| recv_pkt, sizeof(recv_pkt), |
| /*flags:*/ MSG_DONTWAIT, |
| &G.from_lsa->u.sa, &G.from_lsa->len); |
| #endif |
| if (read_len < 0) |
| bb_simple_perror_msg_and_die("recv"); |
| t = monotonic_us(); |
| *left_ms -= (t - *timestamp_us) / 1000; |
| *timestamp_us = t; |
| } |
| |
| return read_len; |
| } |
| |
| static void |
| send_probe(int seq, int ttl) |
| { |
| int len, res; |
| void *out; |
| struct icmp *icp; |
| |
| /* Payload */ |
| #if ENABLE_TRACEROUTE6 |
| if (G_ipv6) { |
| struct outdata6_t *pkt = (void *) outdata; |
| pkt->ident6 = ident; |
| pkt->seq6 = htonl(seq); |
| /*xgettimeofday(&pkt->tv);*/ |
| icp = outicmp6; |
| } else |
| #endif |
| { |
| outdata->seq = seq; |
| outdata->ttl = ttl; |
| // UNUSED: was storing gettimeofday's result there, but never ever checked it |
| /*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/ |
| icp = outicmp; |
| } |
| out = outdata; |
| if (option_mask32 & OPT_USE_ICMP) { |
| out = icp; |
| /*icp->icmp_type = ICMP[6]_ECHO; - already set */ |
| /*icp->icmp_code = 0; - already set */ |
| /*icp->icmp_id = ident; - already set */ |
| icp->icmp_seq = htons(seq); |
| /* Always calculate checksum for icmp packets */ |
| icp->icmp_cksum = 0; |
| icp->icmp_cksum = inet_cksum( |
| icp, |
| ((char*)outip + packlen) - (char*)icp |
| ); |
| if (icp->icmp_cksum == 0) |
| icp->icmp_cksum = 0xffff; |
| } |
| |
| //BUG! verbose is (x & OPT_VERBOSE), not a counter! |
| #if 0 //ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| /* XXX undocumented debugging hack */ |
| if (verbose > 1) { |
| const uint16_t *sp; |
| int nshorts, i; |
| |
| sp = (uint16_t *)outip; |
| nshorts = (unsigned)packlen / sizeof(uint16_t); |
| i = 0; |
| printf("[ %d bytes", packlen); |
| while (--nshorts >= 0) { |
| if ((i++ % 8) == 0) |
| printf("\n\t"); |
| printf(" %04x", ntohs(*sp)); |
| sp++; |
| } |
| if (packlen & 1) { |
| if ((i % 8) == 0) |
| printf("\n\t"); |
| printf(" %02x", *(unsigned char *)sp); |
| } |
| printf("]\n"); |
| } |
| #endif |
| |
| #if ENABLE_TRACEROUTE6 |
| if (G_ipv6) { |
| res = setsockopt_int(sndsock, SOL_IPV6, IPV6_UNICAST_HOPS, ttl); |
| if (res != 0) |
| bb_perror_msg_and_die("setsockopt(%s) %d", "UNICAST_HOPS", ttl); |
| } else |
| #endif |
| { |
| #if defined IP_TTL |
| res = setsockopt_int(sndsock, IPPROTO_IP, IP_TTL, ttl); |
| if (res != 0) |
| bb_perror_msg_and_die("setsockopt(%s) %d", "TTL", ttl); |
| #endif |
| } |
| |
| if (!(option_mask32 & OPT_USE_ICMP)) { |
| set_nport(&dest_lsa->u.sa, htons(port + seq)); |
| } |
| len = ((char*)outip + packlen) - (char*)out; |
| res = xsendto(sndsock, out, len, &dest_lsa->u.sa, dest_lsa->len); |
| if (res != len) |
| bb_error_msg("sent %d octets, ret=%d", len, res); |
| } |
| |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| /* Convert an ICMP "type" field to a printable string */ |
| static const char * |
| pr_type(unsigned char t) |
| { |
| static const char *const ttab[] ALIGN_PTR = { |
| "Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable", |
| "Source Quench", "Redirect", "ICMP 6", "ICMP 7", |
| "Echo", "Router Advert", "Router Solicit", "Time Exceeded", |
| "Param Problem", "Timestamp", "Timestamp Reply", "Info Request", |
| "Info Reply", "Mask Request", "Mask Reply" |
| }; |
| # if ENABLE_TRACEROUTE6 |
| static const char *const ttab6[] ALIGN_PTR = { |
| [0] = "Error", "Dest Unreachable", "Packet Too Big", "Time Exceeded", |
| [4] = "Param Problem", |
| [8] = "Echo Request", "Echo Reply", "Membership Query", "Membership Report", |
| [12] = "Membership Reduction", "Router Solicit", "Router Advert", "Neighbor Solicit", |
| [16] = "Neighbor Advert", "Redirect", |
| }; |
| |
| if (G_ipv6) { |
| if (t < 5) |
| return ttab6[t]; |
| if (t < 128 || t > ND_REDIRECT) |
| return "OUT-OF-RANGE"; |
| return ttab6[(t & 63) + 8]; |
| } |
| # endif |
| if (t >= ARRAY_SIZE(ttab)) |
| return "OUT-OF-RANGE"; |
| |
| return ttab[t]; |
| } |
| static int |
| hexdump_if_verbose(const struct icmp *icp, int len) |
| { |
| const unsigned char *p; |
| int i; |
| |
| if (!verbose) |
| return 0; |
| |
| printf("\n%d bytes from %s to %s: icmp type %u (%s) code %u\n", |
| len, |
| auto_string(xmalloc_sockaddr2dotted_noport(&G.from_lsa->u.sa)), |
| auto_string(xmalloc_sockaddr2dotted_noport(G.to)), |
| icp->icmp_type, pr_type(icp->icmp_type), |
| icp->icmp_code |
| ); |
| p = (const void *)icp; |
| for (i = 0; i < len; i++) { |
| if (!(i & 0xf)) |
| printf("\n%04x:" + (i==0), i); |
| printf(" %02x", p[i]); |
| } |
| bb_putchar('\n'); |
| return 0; |
| } |
| #else |
| # define hexdump_if_verbose(...) 0 |
| #endif |
| |
| static int |
| packet4_ok(int read_len, int seq) |
| { |
| const struct icmp *icp; |
| unsigned char type, code; |
| int hlen; |
| const struct ip *ip; |
| |
| /* NB: reads from (AF_INET, SOCK_RAW, IPPROTO_ICMP) socket |
| * return the entire IP packet (IOW: they do not strip IP header). |
| * This differs from (AF_INET6, SOCK_RAW, IPPROTO_ICMPV6) sockets!? |
| */ |
| ip = (struct ip *) recv_pkt; |
| |
| hlen = ip->ip_hl << 2; |
| if (read_len < hlen + ICMP_MINLEN) { |
| if (verbose) |
| printf("packet too short (%d bytes) from %s\n", read_len, |
| inet_ntoa(G.from_lsa->u.sin.sin_addr)); |
| return 0; |
| } |
| read_len -= hlen; |
| icp = (struct icmp *)(recv_pkt + hlen); |
| type = icp->icmp_type; |
| code = icp->icmp_code; |
| /* Path MTU Discovery (RFC1191) */ |
| pmtu = 0; |
| if (code == ICMP_UNREACH_NEEDFRAG) |
| pmtu = ntohs(icp->icmp_nextmtu); |
| |
| if ((option_mask32 & OPT_USE_ICMP) |
| && type == ICMP_ECHOREPLY |
| && icp->icmp_seq == htons(seq) |
| ) { |
| if (icp->icmp_id != ident) |
| /* reply to another ping/traceroute from this box? */ |
| return 0; /* ignore, silently */ |
| /* In UDP mode, when we reach the machine, we (usually) |
| * would get "port unreachable" - in ICMP we got "echo reply". |
| * Simulate "port unreachable" for caller: |
| */ |
| return ICMP_UNREACH_PORT+1; |
| } |
| |
| if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) |
| || type == ICMP_UNREACH |
| ) { |
| const struct ip *hip; |
| const struct udphdr *up; |
| |
| hip = &icp->icmp_ip; |
| hlen = hip->ip_hl << 2; |
| if (option_mask32 & OPT_USE_ICMP) { |
| struct icmp *hicmp; |
| |
| hicmp = (struct icmp *)((unsigned char *)hip + hlen); |
| if (hlen + SIZEOF_ICMP_HDR <= read_len |
| && hip->ip_p == IPPROTO_ICMP |
| && hicmp->icmp_id == ident |
| && hicmp->icmp_seq == htons(seq) |
| ) { |
| return (type == ICMP_TIMXCEED ? -1 : code + 1); |
| } |
| } else { |
| up = (struct udphdr *)((char *)hip + hlen); |
| if (hlen + 12 <= read_len |
| && hip->ip_p == IPPROTO_UDP |
| // Off: since we do not form the entire IP packet, |
| // but defer it to kernel, we can't set source port, |
| // and thus can't check it here in the reply |
| /* && up->uh_sport == ident */ |
| && up->uh_dport == htons(port + seq) |
| ) { |
| return (type == ICMP_TIMXCEED ? -1 : code + 1); |
| } |
| } |
| } |
| /* testcase: traceroute -vI 127.0.0.1 (sees its own echo requests) */ |
| return hexdump_if_verbose(icp, read_len); |
| } |
| |
| #if ENABLE_TRACEROUTE6 |
| |
| static int |
| packet6_ok(int read_len, int seq) |
| { |
| const struct icmp6_hdr *icp; |
| unsigned char type, code; |
| |
| /* NB: reads from (AF_INET6, SOCK_RAW, IPPROTO_ICMPV6) socket |
| * return only ICMP packet (IOW: they strip IPv6 header). |
| * This differs from (AF_INET, SOCK_RAW, IPPROTO_ICMP) sockets!? |
| */ |
| if (read_len < ICMP_MINLEN) { |
| if (verbose) |
| printf("packet too short (%d bytes) from %s\n", read_len, |
| auto_string(xmalloc_sockaddr2dotted_noport(&G.from_lsa->u.sa))); |
| return 0; |
| } |
| icp = (struct icmp6_hdr *) recv_pkt; |
| |
| type = icp->icmp6_type; |
| code = icp->icmp6_code; |
| |
| if ((option_mask32 & OPT_USE_ICMP) |
| && type == ICMP6_ECHO_REPLY |
| && icp->icmp6_seq == htons(seq) |
| ) { |
| if (icp->icmp6_id != ident) |
| /* reply to another ping/traceroute from this box? */ |
| return 0; /* ignore, silently */ |
| /* In UDP mode, when we reach the machine, we (usually) |
| * would get "port unreachable" - in ICMP we got "echo reply". |
| * Simulate "port unreachable" for caller: |
| */ |
| return (ICMP6_DST_UNREACH_NOPORT << 8) + 1; |
| } |
| |
| if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) |
| || type == ICMP6_DST_UNREACH |
| ) { |
| struct ip6_hdr *hip; |
| struct udphdr *up; |
| int nexthdr; |
| |
| hip = (struct ip6_hdr *)(icp + 1); |
| up = (struct udphdr *) (hip + 1); |
| nexthdr = hip->ip6_nxt; |
| |
| if (nexthdr == IPPROTO_FRAGMENT) { |
| nexthdr = *(unsigned char*)up; |
| up++; |
| } |
| if (nexthdr == IPPROTO_UDP) { |
| struct outdata6_t *pkt; |
| |
| pkt = (struct outdata6_t *) (up + 1); |
| |
| if (pkt->ident6 == ident |
| && ntohl(pkt->seq6) == seq |
| ) { |
| return (type == ICMP6_TIME_EXCEEDED ? -1 : (code<<8)+1); |
| } |
| } |
| } |
| /* cast is safe since the beginning of icmp4 and icmp6 layouts match */ |
| return hexdump_if_verbose((const struct icmp *)icp, read_len); |
| } |
| |
| static int |
| packet_ok(int read_len, int seq) |
| { |
| if (!G_ipv6) |
| return packet4_ok(read_len, seq); |
| return packet6_ok(read_len, seq); |
| } |
| |
| #else /* !ENABLE_TRACEROUTE6 */ |
| |
| # define packet_ok(read_len, seq) packet4_ok(read_len, seq) |
| |
| #endif |
| |
| static void |
| #if !ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| print(void) |
| # define print(len) print() |
| #else |
| print(int read_len) |
| #endif |
| { |
| char *ina = auto_string(xmalloc_sockaddr2dotted_noport(&G.from_lsa->u.sa)); |
| |
| if (option_mask32 & OPT_ADDR_NUM) { |
| printf(" %s", ina); |
| } else { |
| char *n = NULL; |
| if (G_ipv6 |
| || G.from_lsa->u.sin.sin_addr.s_addr != INADDR_ANY |
| ) { |
| /* Reverse resolve if IPV6 or not 0.0.0.0 */ |
| n = auto_string(xmalloc_sockaddr2host_noport(&G.from_lsa->u.sa)); |
| } |
| printf(" %s (%s)", (n ? n : ina), ina); |
| } |
| |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| if (verbose) { |
| # if ENABLE_TRACEROUTE6 |
| /* NB: reads from (AF_INET, SOCK_RAW, IPPROTO_ICMP) socket |
| * return the entire IP packet (IOW: they do not strip IP header). |
| * Reads from (AF_INET6, SOCK_RAW, IPPROTO_ICMPV6) do strip IPv6 |
| * header and return only ICMP6 packet. Weird. |
| */ |
| if (G_ipv6) { |
| /* read_len -= sizeof(struct ip6_hdr); - WRONG! */ |
| } else |
| # endif |
| { |
| struct ip *ip4packet = (struct ip*)recv_pkt; |
| read_len -= ip4packet->ip_hl << 2; |
| } |
| printf(" %d bytes to %s", read_len, |
| auto_string(xmalloc_sockaddr2dotted_noport(G.to)) |
| ); |
| } |
| #endif |
| } |
| |
| static void |
| print_delta_ms(unsigned t1p, unsigned t2p) |
| { |
| unsigned tt = t2p - t1p; |
| printf(" %u.%03u ms", tt / 1000, tt % 1000); |
| } |
| |
| /* Keeping init code in a separate (not inlined!) function |
| * for stack use reduction and better register allocation in main loop. |
| */ |
| static NOINLINE void |
| traceroute_init(int op, char **argv) |
| { |
| char *source; |
| char *device; |
| char *tos_str; |
| char *max_ttl_str; |
| char *port_str; |
| char *nprobes_str; |
| char *waittime_str; |
| char *pausemsecs_str; |
| char *first_ttl_str; |
| char *dest_str; |
| #if ENABLE_TRACEROUTE6 |
| sa_family_t af; |
| #else |
| enum { af = AF_INET }; |
| #endif |
| |
| /* Ensure the socket fds won't be 0, 1 or 2 */ |
| bb_sanitize_stdio(); |
| |
| INIT_G(); |
| port = 33434; |
| waittime = 5; |
| G.first_ttl = 1; |
| G.nprobes = 3; |
| G.max_ttl = 30; |
| |
| op |= getopt32(argv, "^" |
| OPT_STRING |
| "\0" "-1" /* minimum 1 arg */ |
| , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str |
| , &source, &waittime_str, &pausemsecs_str, &first_ttl_str |
| ); |
| argv += optind; |
| |
| if (op & OPT_MAX_TTL) |
| G.max_ttl = xatou_range(max_ttl_str, 1, 255); |
| if (op & OPT_PORT) |
| port = xatou16(port_str); |
| if (op & OPT_NPROBES) |
| G.nprobes = xatou_range(nprobes_str, 1, INT_MAX); |
| if (op & OPT_WAITTIME) |
| waittime = xatou_range(waittime_str, 1, 24 * 60 * 60); |
| if (op & OPT_PAUSE_MS) |
| G.pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000); |
| if (op & OPT_FIRST_TTL) |
| G.first_ttl = xatou_range(first_ttl_str, 1, G.max_ttl); |
| |
| /* Process destination and optional packet size */ |
| packlen = sizeof(struct ip) |
| + sizeof(struct udphdr) |
| + sizeof(struct outdata_t); |
| if (op & OPT_USE_ICMP) { |
| packlen = sizeof(struct ip) |
| + SIZEOF_ICMP_HDR |
| + sizeof(struct outdata_t); |
| port = 0; /* on ICMP6 sockets, sendto(ipv6.nonzero_port) throws EINVAL! */ |
| } |
| #if ENABLE_TRACEROUTE6 |
| af = AF_UNSPEC; |
| if (op & OPT_IPV4) |
| af = AF_INET; |
| if (op & OPT_IPV6) |
| af = AF_INET6; |
| dest_lsa = xhost_and_af2sockaddr(argv[0], port, af); |
| af = dest_lsa->u.sa.sa_family; |
| //TODO: make sure af == AF_INET[6]? (FEATURE_UNIX_LOCAL=y allows "local:/PATH" to be translated to AF_UNIX) |
| if (af == AF_INET6) { |
| G_ipv6 = 1; |
| packlen = sizeof(struct ip6_hdr) |
| + sizeof(struct udphdr) |
| + sizeof(struct outdata6_t); |
| if (op & OPT_USE_ICMP) |
| packlen = sizeof(struct ip6_hdr) |
| + SIZEOF_ICMP_HDR |
| + sizeof(struct outdata6_t); |
| } |
| #else |
| /* accept only IPv4 addresses */ |
| dest_lsa = xhost_and_af2sockaddr(argv[0], port, AF_INET); |
| #endif |
| G.from_lsa = xmemdup(dest_lsa, LSA_LEN_SIZE + dest_lsa->len); |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| G.to = xzalloc(dest_lsa->len); |
| #endif |
| if (argv[1]) |
| packlen = xatoul_range(argv[1], packlen, 32 * 1024); |
| |
| if (af == AF_INET) { |
| xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), rcvsock); |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| /* want recvmsg to report target local address (for -v) */ |
| setsockopt_1(rcvsock, IPPROTO_IP, IP_PKTINFO); |
| #endif |
| } |
| #if ENABLE_TRACEROUTE6 |
| else { |
| xmove_fd(xsocket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6), rcvsock); |
| # if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| /* want recvmsg to report target local address (for -v) */ |
| setsockopt_1(rcvsock, SOL_IPV6, IPV6_RECVPKTINFO); |
| # endif |
| } |
| #endif |
| #if TRACEROUTE_SO_DEBUG |
| if (op & OPT_DEBUG) |
| setsockopt_SOL_SOCKET_1(rcvsock, SO_DEBUG); |
| #endif |
| |
| { |
| int snd; |
| if (af == AF_INET) { |
| if (op & OPT_USE_ICMP) |
| snd = xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP); |
| else |
| snd = xsocket(AF_INET, SOCK_DGRAM, 0); |
| } |
| #if ENABLE_TRACEROUTE6 |
| # if defined(__FreeBSD__) |
| # define SOL_V6_OPTION SOL_IPV6 |
| # else |
| # define SOL_V6_OPTION SOL_RAW |
| # endif |
| else { |
| if (setsockopt_int(rcvsock, SOL_V6_OPTION, IPV6_CHECKSUM, 2) != 0) |
| bb_perror_msg_and_die("setsockopt(%s)", "IPV6_CHECKSUM"); |
| if (op & OPT_USE_ICMP) |
| snd = xsocket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6); |
| else |
| snd = xsocket(AF_INET6, SOCK_DGRAM, 0); |
| } |
| #endif |
| xmove_fd(snd, sndsock); |
| } |
| |
| #ifdef SO_SNDBUF |
| if (setsockopt_SOL_SOCKET_int(sndsock, SO_SNDBUF, packlen) != 0) { |
| bb_perror_msg_and_die("setsockopt(%s)", "SO_SNDBUF"); |
| } |
| #endif |
| #ifdef IP_TOS |
| if (op & OPT_TOS) { |
| int tos = xatou_range(tos_str, 0, 255); |
| if (setsockopt_int(sndsock, IPPROTO_IP, IP_TOS, tos) != 0) |
| bb_perror_msg_and_die("setsockopt(%s,%d)", "TOS", tos); |
| } |
| #endif |
| #ifdef IP_DONTFRAG |
| if (op & OPT_DONT_FRAGMNT) |
| setsockopt_1(sndsock, IPPROTO_IP, IP_DONTFRAG); |
| #endif |
| #if TRACEROUTE_SO_DEBUG |
| if (op & OPT_DEBUG) |
| setsockopt_SOL_SOCKET_1(sndsock, SO_DEBUG); |
| #endif |
| if (op & OPT_BYPASS_ROUTE) |
| setsockopt_SOL_SOCKET_1(sndsock, SO_DONTROUTE); |
| |
| outip = xzalloc(packlen); |
| |
| ident = getpid(); |
| /* we can use native-endian ident, but other Unix ping/traceroute |
| * utils use *big-endian pid*, and e.g. ping on our machine may be |
| * *not* from busybox, idents may collide. Follow the convention: |
| */ |
| ident = htons(ident); |
| |
| outdata = (void*)(outudp + 1); |
| if (af == AF_INET) { |
| if (op & OPT_USE_ICMP) { |
| outicmp->icmp_type = ICMP_ECHO; |
| /*outicmp->icmp_code = 0; - set by xzalloc */ |
| outicmp->icmp_id = ident; |
| outdata = (void*)((char *)outicmp + SIZEOF_ICMP_HDR); |
| } |
| } |
| #if ENABLE_TRACEROUTE6 |
| else { |
| outdata = (void*)(outudp6 + 1); |
| if (op & OPT_USE_ICMP) { |
| outicmp6->icmp_type = ICMP6_ECHO_REQUEST; |
| /*outicmp->icmp_code = 0; - set by xzalloc */ |
| outicmp6->icmp_id = ident; |
| outdata = (void*)((char *)outicmp6 + SIZEOF_ICMP_HDR); |
| } |
| } |
| #endif |
| |
| if (op & OPT_DEVICE) /* hmm, do we need error check? */ |
| setsockopt_bindtodevice(sndsock, device); |
| |
| if (op & OPT_SOURCE) { |
| #if ENABLE_TRACEROUTE6 |
| // TODO: need xdotted_and_af2sockaddr? |
| len_and_sockaddr *source_lsa = xhost_and_af2sockaddr(source, 0, af); |
| #else |
| len_and_sockaddr *source_lsa = xdotted2sockaddr(source, 0); |
| #endif |
| if (getuid() != 0) |
| bb_simple_error_msg_and_die(bb_msg_you_must_be_root); |
| /* Ping4 does this (why?) */ |
| if (af == AF_INET) |
| if (setsockopt(sndsock, IPPROTO_IP, IP_MULTICAST_IF, |
| &source_lsa->u.sa, source_lsa->len)) |
| bb_simple_error_msg_and_die("can't set multicast source interface"); |
| //TODO: we can query source port we bound to, |
| // and check it in replies... if we care enough |
| xbind(sndsock, &source_lsa->u.sa, source_lsa->len); |
| if (ENABLE_FEATURE_CLEAN_UP) |
| free(source_lsa); |
| } else { |
| len_and_sockaddr *source_lsa; |
| |
| set_nport(&dest_lsa->u.sa, htons(port)); |
| /* Connect makes kernel pick source IP (and port if UDP) */ |
| xconnect(sndsock, &dest_lsa->u.sa, dest_lsa->len); |
| /* Read IP and port */ |
| source_lsa = get_sock_lsa(sndsock); |
| if (source_lsa == NULL) |
| bb_simple_perror_msg_and_die("getsockname"); |
| /* bind our recv ICMP socket to this IP (but not port, ICMP has no ports) */ |
| //set_nport(&source_lsa->u.sa, 0); - paranoia, seems to work without this for both ipv4 and ipv6 |
| xbind(rcvsock, &source_lsa->u.sa, source_lsa->len); |
| if (ENABLE_FEATURE_CLEAN_UP) |
| free(source_lsa); |
| } |
| |
| /* Revert to non-privileged user after opening sockets */ |
| xsetgid(getgid()); |
| xsetuid(getuid()); |
| |
| dest_str = xmalloc_sockaddr2dotted_noport(&dest_lsa->u.sa); |
| printf("traceroute to %s (%s)", argv[0], dest_str); |
| if (ENABLE_FEATURE_CLEAN_UP) |
| free(dest_str); |
| |
| if (op & OPT_SOURCE) |
| printf(" from %s", source); |
| printf(", %d hops max, %d byte packets\n", G.max_ttl, packlen); |
| } |
| |
| static int |
| common_traceroute_main(int op, char **argv) |
| { |
| int ttl; |
| int seq; |
| struct sockaddr *lastaddr; |
| |
| traceroute_init(op, argv); |
| |
| lastaddr = xzalloc(dest_lsa->len); |
| seq = 0; |
| for (ttl = G.first_ttl; ttl <= G.max_ttl; ++ttl) { |
| int probe; |
| int unreachable = 0; /* counter */ |
| int got_there = 0; |
| |
| printf("%2d", ttl); |
| for (probe = 0; probe < G.nprobes; ++probe) { |
| unsigned t1; |
| unsigned t2; |
| int left_ms; |
| int read_len; |
| int icmp_code; |
| |
| fflush_all(); |
| if (probe != 0) |
| msleep(G.pausemsecs); |
| |
| send_probe(++seq, ttl); |
| |
| t2 = t1 = monotonic_us(); |
| left_ms = waittime * 1000; |
| for (;;) { |
| /* NB: wait_for_reply() fills "G.from_lsa" and "G.to" with |
| * "where it came from" and "what local address it arrived to" |
| * addresses. Sets t2 = monotonic_us(), updates left_ms. |
| */ |
| read_len = wait_for_reply(&t2, &left_ms); |
| |
| if (read_len == 0) { /* there was no packet at all? */ |
| printf(" *"); |
| goto next_probe; |
| } |
| icmp_code = packet_ok(read_len, seq); |
| if (icmp_code != 0) |
| break; /* got a good response */ |
| /* unrecognized type/code or too short, back to recv */ |
| } |
| |
| if (probe == 0 |
| || (memcmp(lastaddr, &G.from_lsa->u.sa, G.from_lsa->len) != 0) |
| ) { |
| print(read_len); |
| memcpy(lastaddr, &G.from_lsa->u.sa, G.from_lsa->len); |
| } |
| print_delta_ms(t1, t2); |
| if (!G_ipv6) { |
| if (op & OPT_TTL_FLAG) { |
| struct ip *ip = (struct ip *)recv_pkt; |
| printf(" (%d)", ip->ip_ttl); |
| } |
| } |
| |
| /* Got a "time exceeded in transit" icmp message? */ |
| if (icmp_code == -1) |
| continue; |
| |
| icmp_code--; |
| switch (icmp_code) { |
| #if ENABLE_TRACEROUTE6 |
| case ICMP6_DST_UNREACH_NOPORT << 8: |
| got_there = 1; |
| break; |
| #endif |
| case ICMP_UNREACH_PORT: { |
| struct ip *ip = (struct ip *)recv_pkt; |
| if (ip->ip_ttl <= 1) |
| printf(" !"); |
| got_there = 1; |
| break; |
| } |
| case ICMP_UNREACH_NET: |
| #if ENABLE_TRACEROUTE6 && (ICMP6_DST_UNREACH_NOROUTE != ICMP_UNREACH_NET) |
| case ICMP6_DST_UNREACH_NOROUTE << 8: |
| #endif |
| printf(" !N"); |
| ++unreachable; |
| break; |
| case ICMP_UNREACH_HOST: |
| #if ENABLE_TRACEROUTE6 |
| case ICMP6_DST_UNREACH_ADDR << 8: |
| #endif |
| printf(" !H"); |
| ++unreachable; |
| break; |
| case ICMP_UNREACH_PROTOCOL: |
| printf(" !P"); |
| got_there = 1; |
| break; |
| case ICMP_UNREACH_NEEDFRAG: |
| printf(" !F-%d", pmtu); |
| ++unreachable; |
| break; |
| case ICMP_UNREACH_SRCFAIL: |
| #if ENABLE_TRACEROUTE6 |
| case ICMP6_DST_UNREACH_ADMIN << 8: |
| #endif |
| printf(" !S"); |
| ++unreachable; |
| break; |
| case ICMP_UNREACH_FILTER_PROHIB: |
| case ICMP_UNREACH_NET_PROHIB: /* misuse */ |
| printf(" !A"); |
| ++unreachable; |
| break; |
| case ICMP_UNREACH_HOST_PROHIB: |
| printf(" !C"); |
| ++unreachable; |
| break; |
| case ICMP_UNREACH_HOST_PRECEDENCE: |
| printf(" !V"); |
| ++unreachable; |
| break; |
| case ICMP_UNREACH_PRECEDENCE_CUTOFF: |
| printf(" !C"); |
| ++unreachable; |
| break; |
| case ICMP_UNREACH_NET_UNKNOWN: |
| case ICMP_UNREACH_HOST_UNKNOWN: |
| printf(" !U"); |
| ++unreachable; |
| break; |
| case ICMP_UNREACH_ISOLATED: |
| printf(" !I"); |
| ++unreachable; |
| break; |
| case ICMP_UNREACH_TOSNET: |
| case ICMP_UNREACH_TOSHOST: |
| printf(" !T"); |
| ++unreachable; |
| break; |
| default: |
| printf(" !<%d>", icmp_code); |
| ++unreachable; |
| break; |
| } |
| next_probe: ; |
| } /* for (nprobes) */ |
| |
| bb_putchar('\n'); |
| if (got_there |
| || (unreachable > 0 && unreachable >= G.nprobes - 1) |
| ) { |
| break; |
| } |
| } |
| |
| if (ENABLE_FEATURE_CLEAN_UP) { |
| #if ENABLE_FEATURE_TRACEROUTE_VERBOSE |
| free(G.to); |
| #endif |
| free(lastaddr); |
| free(G.from_lsa); |
| } |
| |
| return 0; |
| } |
| |
| #if ENABLE_TRACEROUTE |
| int traceroute_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int traceroute_main(int argc UNUSED_PARAM, char **argv) |
| { |
| return common_traceroute_main(0, argv); |
| } |
| #endif |
| |
| #if ENABLE_TRACEROUTE6 |
| int traceroute6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int traceroute6_main(int argc UNUSED_PARAM, char **argv) |
| { |
| return common_traceroute_main(OPT_IPV6, argv); |
| } |
| #endif |