busybox/networking/traceroute.c

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/* 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")"FIlnrv] [-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 Time to wait for a response (default 3)"
//usage: "\n -g IP Loose source route gateway (8 max)"
//usage:
//usage:#define traceroute6_trivial_usage
//usage: "[-nrv] [-m MAXTTL] [-q PROBES] [-p PORT]\n"
//usage: " [-t TOS] [-w WAIT_SEC] [-s SRC_IP] [-i IFACE]\n"
//usage: " HOST [BYTES]"
//usage:#define traceroute6_full_usage "\n\n"
//usage: "Trace the route to HOST\n"
//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 -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 Time wait for a response (default 3)"
#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 \
"FIlnrdvxt: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_IP_CHKSUM = (1 << 7), /* x */
OPT_TOS = (1 << 8), /* t */
OPT_DEVICE = (1 << 9), /* i */
OPT_MAX_TTL = (1 << 10), /* m */
OPT_PORT = (1 << 11), /* p */
OPT_NPROBES = (1 << 12), /* q */
OPT_SOURCE = (1 << 13), /* s */
OPT_WAITTIME = (1 << 14), /* w */
OPT_PAUSE_MS = (1 << 15), /* z */
OPT_FIRST_TTL = (1 << 16), /* f */
OPT_IPV4 = (1 << 17), /* 4 */
OPT_IPV6 = (1 << 18) * 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.
2008-07-05 14:48:54 +05:30
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 */
struct sockaddr *to; /* response came to this (local) address */
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;
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);
if (read_len < 0)
bb_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);
/*gettimeofday(&pkt->tv, &tz);*/
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->source == ident */
&& up->dest == 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!?
*/
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
print(int read_len)
{
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 (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))
);
}
}
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;
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-09 01:25:02 +05:30
op |= getopt32(argv, "^"
OPT_STRING
"\0" "-1:x-x" /* minimum 1 arg */
, &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str
, &source, &waittime_str, &pausemsecs_str, &first_ttl_str
);
argv += optind;
#if 0 /* IGNORED */
if (op & OPT_IP_CHKSUM)
2006-10-08 18:19:22 +05:30
bb_error_msg("warning: ip checksums disabled");
#endif
if (op & OPT_MAX_TTL)
G.max_ttl = xatou_range(max_ttl_str, 1, 255);
if (op & OPT_PORT)
2006-10-08 18:19:22 +05:30
port = xatou16(port_str);
if (op & OPT_NPROBES)
G.nprobes = xatou_range(nprobes_str, 1, INT_MAX);
if (op & OPT_WAITTIME)
2009-01-25 02:53:41 +05:30
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);
G.to = xzalloc(dest_lsa->len);
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);
/* want recvmsg to report target local address (for -v) */
setsockopt_1(rcvsock, IPPROTO_IP, IP_PKTINFO);
}
#if ENABLE_TRACEROUTE6
else {
xmove_fd(xsocket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6), rcvsock);
/* want recvmsg to report target local address (for -v) */
setsockopt_1(rcvsock, SOL_IPV6, IPV6_RECVPKTINFO);
}
#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
else {
if (setsockopt_int(rcvsock, SOL_RAW, 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))
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
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) {
free(G.to);
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