-/*-
- * Copyright (c) 1990, 1993
+/* 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.
*
- * This code is derived from software contributed to Berkeley by
- * Van Jacobson.
+ * Busybox port by Vladimir Oleynik (C) 2005 <dzo@simtreas.ru>
*
- * Special for busybox ported by Vladimir Oleynik <dzo@simtreas.ru> 2001
* Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
+ * 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.
*/
+//#define version "1.4a12"
+
+
/*
* 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
* back to yourself. Unfortunately, SO many gateways botch source
* routing, the thing is almost worthless. Maybe one day...
*
- * -- Van Jacobson (van@helios.ee.lbl.gov)
+ * -- Van Jacobson (van@ee.lbl.gov)
* Tue Dec 20 03:50:13 PST 1988
*/
-#undef BB_FEATURE_TRACEROUTE_VERBOSE
-//#define BB_FEATURE_TRACEROUTE_VERBOSE
-#undef BB_FEATURE_TRACEROUTE_SO_DEBUG /* not in documentation man */
-
-#include <stdio.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/time.h>
-#include <netdb.h>
-#include <endian.h>
+#define TRACEROUTE_SO_DEBUG 0
+
+/* TODO: undefs were uncommented - ??! we have config system for that! */
+/* probably ok to remove altogether */
+//#undef CONFIG_FEATURE_TRACEROUTE_VERBOSE
+//#define CONFIG_FEATURE_TRACEROUTE_VERBOSE
+//#undef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+//#define CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
+//#undef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
+//#define CONFIG_FEATURE_TRACEROUTE_USE_ICMP
+
+#include "inet_common.h"
+
+#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>
+#include "busybox.h"
+
+
+/*
+ * Definitions for internet protocol version 4.
+ * Per RFC 791, September 1981.
+ */
+#define IPVERSION 4
-#define MAXPACKET 65535 /* max ip packet size */
-#ifndef MAXHOSTNAMELEN
-#define MAXHOSTNAMELEN 64
+#ifndef IPPROTO_ICMP
+/* Grrrr.... */
+#define IPPROTO_ICMP 1
+#endif
+#ifndef IPPROTO_IP
+#define IPPROTO_IP 0
#endif
/*
- * format of a (udp) probe packet.
+ * Overlay for ip header used by other protocols (tcp, udp).
*/
-struct opacket {
- struct ip ip;
- struct udphdr udp;
- u_char seq; /* sequence number of this packet */
- u_char ttl; /* ttl packet left with */
- struct timeval tv; /* time packet left */
+struct ipovly {
+ unsigned char ih_x1[9]; /* (unused) */
+ unsigned char ih_pr; /* protocol */
+ short ih_len; /* protocol length */
+ struct in_addr ih_src; /* source internet address */
+ struct in_addr ih_dst; /* destination internet address */
};
/*
- * Definitions for internet protocol version 4.
- * Per RFC 791, September 1981.
+ * UDP kernel structures and variables.
*/
-#define IPVERSION 4
+struct udpiphdr {
+ struct ipovly ui_i; /* overlaid ip structure */
+ struct udphdr ui_u; /* udp header */
+};
+#define ui_next ui_i.ih_next
+#define ui_prev ui_i.ih_prev
+#define ui_x1 ui_i.ih_x1
+#define ui_pr ui_i.ih_pr
+#define ui_len ui_i.ih_len
+#define ui_src ui_i.ih_src
+#define ui_dst ui_i.ih_dst
+#define ui_sport ui_u.uh_sport
+#define ui_dport ui_u.uh_dport
+#define ui_ulen ui_u.uh_ulen
+#define ui_sum ui_u.uh_sum
-#include "busybox.h"
+/* Host name and address list */
+struct hostinfo {
+ char *name;
+ int n;
+ u_int32_t *addrs;
+};
+
+/* Data section of the probe packet */
+struct outdata {
+ unsigned char seq; /* sequence number of this packet */
+ unsigned char ttl; /* ttl packet left with */
+ struct timeval tv ATTRIBUTE_PACKED; /* time packet left */
+};
+
+struct IFADDRLIST {
+ u_int32_t addr;
+ char device[sizeof(struct ifreq)];
+};
-static u_char packet[512]; /* last inbound (icmp) packet */
-static struct opacket *outpacket; /* last output (udp) packet */
+
+static const char route[] = "/proc/net/route";
+
+/* last inbound (icmp) packet */
+static unsigned char packet[512] ATTRIBUTE_ALIGNED(32);
+
+static struct ip *outip; /* last output (udp) packet */
+static struct udphdr *outudp; /* last output (udp) packet */
+static struct outdata *outdata; /* last output (udp) packet */
+
+#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
+static struct icmp *outicmp; /* last output (icmp) packet */
+#endif
+
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+/* Maximum number of gateways (include room for one noop) */
+#define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(u_int32_t)))
+/* loose source route gateway list (including room for final destination) */
+static u_int32_t gwlist[NGATEWAYS + 1];
+#endif
static int s; /* receive (icmp) socket file descriptor */
-static int sndsock; /* send (udp) socket file descriptor */
+static int sndsock; /* send (udp/icmp) socket file descriptor */
-static struct sockaddr whereto; /* Who to try to reach */
-static int datalen; /* How much data */
+static struct sockaddr_storage whereto; /* Who to try to reach */
+static struct sockaddr_storage wherefrom; /* Who we are */
+static int packlen; /* total length of packet */
+static int minpacket; /* min ip packet size */
+static int maxpacket = 32 * 1024; /* max ip packet size */
+static int pmtu; /* Path MTU Discovery (RFC1191) */
static char *hostname;
-static int max_ttl = 30;
-static u_short ident;
-static u_short port = 32768+666; /* start udp dest port # for probe packets */
+static uint16_t ident;
+static uint16_t port = 32768 + 666; /* start udp dest port # for probe packets */
-#ifdef BB_FEATURE_TRACEROUTE_VERBOSE
-static int verbose;
-#endif
static int waittime = 5; /* time to wait for response (in seconds) */
static int nflag; /* print addresses numerically */
+static int doipcksum = 1; /* calculate ip checksums by default */
+
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+static int optlen; /* length of ip options */
+#else
+#define optlen 0
+#endif
+
+#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
+static int useicmp; /* use icmp echo instead of udp packets */
+#endif
+#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
+static int verbose;
+#endif
/*
- * Construct an Internet address representation.
- * If the nflag has been supplied, give
- * numeric value, otherwise try for symbolic name.
+ * Return the interface list
*/
-static inline char *
-inetname(struct in_addr in)
+static int
+ifaddrlist(struct IFADDRLIST **ipaddrp)
{
- char *cp;
- static char line[50];
- struct hostent *hp;
- static char domain[MAXHOSTNAMELEN + 1];
- static int first = 1;
-
- if (first && !nflag) {
- first = 0;
- if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
- (cp = index(domain, '.')))
- (void) strcpy(domain, cp + 1);
+ int fd, nipaddr;
+#ifdef HAVE_SOCKADDR_SA_LEN
+ int n;
+#endif
+ struct ifreq *ifrp, *ifend, *ifnext;
+ struct sockaddr_in *addr_sin;
+ struct IFADDRLIST *al;
+ struct ifconf ifc;
+ struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr;
+ struct IFADDRLIST *st_ifaddrlist;
+
+ fd = xsocket(AF_INET, SOCK_DGRAM, 0);
+
+ ifc.ifc_len = sizeof(ibuf);
+ ifc.ifc_buf = (caddr_t)ibuf;
+
+ if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
+ ifc.ifc_len < sizeof(struct ifreq)) {
+ if (errno == EINVAL)
+ bb_error_msg_and_die(
+ "SIOCGIFCONF: ifreq struct too small (%d bytes)",
+ (int)sizeof(ibuf));
else
- domain[0] = 0;
+ bb_perror_msg_and_die("SIOCGIFCONF");
}
- cp = 0;
- if (!nflag && in.s_addr != INADDR_ANY) {
- hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
- if (hp) {
- if ((cp = index(hp->h_name, '.')) &&
- !strcmp(cp + 1, domain))
- *cp = 0;
- cp = (char *)hp->h_name;
+ ifrp = ibuf;
+ ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
+
+ nipaddr = 1 + (ifc.ifc_len / sizeof(struct ifreq));
+ st_ifaddrlist = xzalloc(nipaddr * sizeof(struct IFADDRLIST));
+ al = st_ifaddrlist;
+ nipaddr = 0;
+
+ for (; ifrp < ifend; ifrp = ifnext) {
+#ifdef HAVE_SOCKADDR_SA_LEN
+ n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
+ if (n < sizeof(*ifrp))
+ ifnext = ifrp + 1;
+ else
+ ifnext = (struct ifreq *)((char *)ifrp + n);
+ if (ifrp->ifr_addr.sa_family != AF_INET)
+ continue;
+#else
+ ifnext = ifrp + 1;
+#endif
+ /*
+ * Need a template to preserve address info that is
+ * used below to locate the next entry. (Otherwise,
+ * SIOCGIFFLAGS stomps over it because the requests
+ * are returned in a union.)
+ */
+ strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
+ if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
+ if (errno == ENXIO)
+ continue;
+ bb_perror_msg_and_die("SIOCGIFFLAGS: %.*s",
+ (int)sizeof(ifr.ifr_name), ifr.ifr_name);
}
+
+ /* Must be up */
+ if ((ifr.ifr_flags & IFF_UP) == 0)
+ continue;
+
+ safe_strncpy(al->device, ifr.ifr_name, sizeof(ifr.ifr_name) + 1);
+#ifdef sun
+ /* Ignore sun virtual interfaces */
+ if (strchr(al->device, ':') != NULL)
+ continue;
+#endif
+ if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0)
+ bb_perror_msg_and_die("SIOCGIFADDR: %s", al->device);
+
+ addr_sin = (struct sockaddr_in *)&ifr.ifr_addr;
+ al->addr = addr_sin->sin_addr.s_addr;
+ ++al;
+ ++nipaddr;
}
- if (cp)
- (void) strcpy(line, cp);
- else {
- in.s_addr = ntohl(in.s_addr);
- strcpy(line, inet_ntoa(in));
- }
- return (line);
+ if (nipaddr == 0)
+ bb_error_msg_and_die ("can't find any network interfaces");
+ (void)close(fd);
+
+ *ipaddrp = st_ifaddrlist;
+ return nipaddr;
}
-static inline void
-print(u_char *buf, int cc, struct sockaddr_in *from)
+
+static void
+setsin(struct sockaddr_in *addr_sin, u_int32_t addr)
{
- struct ip *ip;
- int hlen;
+ memset(addr_sin, 0, sizeof(*addr_sin));
+#ifdef HAVE_SOCKADDR_SA_LEN
+ addr_sin->sin_len = sizeof(*addr_sin);
+#endif
+ addr_sin->sin_family = AF_INET;
+ addr_sin->sin_addr.s_addr = addr;
+}
- ip = (struct ip *) buf;
- hlen = ip->ip_hl << 2;
- cc -= hlen;
- if (nflag)
- printf(" %s", inet_ntoa(from->sin_addr));
- else
- printf(" %s (%s)", inetname(from->sin_addr),
- inet_ntoa(from->sin_addr));
+/*
+ * Return the source address for the given destination address
+ */
+static void
+findsaddr(const struct sockaddr_in *to, struct sockaddr_in *from)
+{
+ int i, n;
+ FILE *f;
+ u_int32_t mask;
+ u_int32_t dest, tmask;
+ struct IFADDRLIST *al;
+ char buf[256], tdevice[256], device[256];
-#ifdef BB_FEATURE_TRACEROUTE_VERBOSE
- if (verbose)
- printf (" %d bytes to %s", cc, inet_ntoa (ip->ip_dst));
-#endif
+ f = xfopen(route, "r");
+
+ /* Find the appropriate interface */
+ n = 0;
+ mask = 0;
+ device[0] = '\0';
+ while (fgets(buf, sizeof(buf), f) != NULL) {
+ ++n;
+ if (n == 1 && strncmp(buf, "Iface", 5) == 0)
+ continue;
+ if ((i = sscanf(buf, "%255s %x %*s %*s %*s %*s %*s %x",
+ tdevice, &dest, &tmask)) != 3)
+ bb_error_msg_and_die ("junk in buffer");
+ if ((to->sin_addr.s_addr & tmask) == dest &&
+ (tmask > mask || mask == 0)) {
+ mask = tmask;
+ strcpy(device, tdevice);
+ }
+ }
+ fclose(f);
+
+ if (device[0] == '\0')
+ bb_error_msg_and_die ("can't find interface");
+
+ /* Get the interface address list */
+ n = ifaddrlist(&al);
+
+ /* Find our appropriate source address */
+ for (i = n; i > 0; --i, ++al)
+ if (strcmp(device, al->device) == 0)
+ break;
+ if (i <= 0)
+ bb_error_msg_and_die("can't find interface %s", device);
+
+ setsin(from, al->addr);
}
-static inline double
-deltaT(struct timeval *t1p, struct timeval *t2p)
+/*
+"Usage: %s [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]\n"
+"\t[-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]\n"
+"\t[-w waittime] [-z pausemsecs] host [packetlen]"
+
+*/
+
+/*
+ * Subtract 2 timeval structs: out = out - in.
+ * Out is assumed to be >= in.
+ */
+static inline void
+tvsub(struct timeval *out, struct timeval *in)
{
- double dt;
- dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
- (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
- return (dt);
+ if ((out->tv_usec -= in->tv_usec) < 0) {
+ --out->tv_sec;
+ out->tv_usec += 1000000;
+ }
+ out->tv_sec -= in->tv_sec;
}
-static inline int
-wait_for_reply(int sock, struct sockaddr_in *from, int reset_timer)
+static int
+wait_for_reply(int sock, struct sockaddr_in *fromp, const struct timeval *tp)
{
fd_set fds;
- static struct timeval wait;
+ struct timeval now, tvwait;
+ struct timezone tz;
int cc = 0;
- int fromlen = sizeof (*from);
+ socklen_t fromlen = sizeof(*fromp);
FD_ZERO(&fds);
FD_SET(sock, &fds);
- if (reset_timer) {
- /*
- * traceroute could hang if someone else has a ping
- * running and our ICMP reply gets dropped but we don't
- * realize it because we keep waking up to handle those
- * other ICMP packets that keep coming in. To fix this,
- * "reset_timer" will only be true if the last packet that
- * came in was for us or if this is the first time we're
- * waiting for a reply since sending out a probe. Note
- * that this takes advantage of the select() feature on
- * Linux where the remaining timeout is written to the
- * struct timeval area.
- */
- wait.tv_sec = waittime;
- wait.tv_usec = 0;
+
+ tvwait.tv_sec = tp->tv_sec + waittime;
+ tvwait.tv_usec = tp->tv_usec;
+ (void)gettimeofday(&now, &tz);
+ tvsub(&tvwait, &now);
+
+ if (select(sock + 1, &fds, NULL, NULL, &tvwait) > 0)
+ cc = recvfrom(sock, (char *)packet, sizeof(packet), 0,
+ (struct sockaddr *)fromp, &fromlen);
+
+ return cc;
+}
+
+/*
+ * Checksum routine for Internet Protocol family headers (C Version)
+ */
+static uint16_t
+in_cksum(uint16_t *addr, int len)
+{
+ int nleft = len;
+ uint16_t *w = addr;
+ uint16_t answer;
+ int sum = 0;
+
+ /*
+ * Our algorithm is simple, using a 32 bit accumulator (sum),
+ * we add sequential 16 bit words to it, and at the end, fold
+ * back all the carry bits from the top 16 bits into the lower
+ * 16 bits.
+ */
+ while (nleft > 1) {
+ sum += *w++;
+ nleft -= 2;
}
- if (select(sock+1, &fds, (fd_set *)0, (fd_set *)0, &wait) > 0)
- cc=recvfrom(s, (char *)packet, sizeof(packet), 0,
- (struct sockaddr *)from, &fromlen);
+ /* mop up an odd byte, if necessary */
+ if (nleft == 1)
+ sum += *(unsigned char *)w;
- return(cc);
+ /*
+ * add back carry outs from top 16 bits to low 16 bits
+ */
+ sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
+ sum += (sum >> 16); /* add carry */
+ answer = ~sum; /* truncate to 16 bits */
+ return answer;
}
-#ifdef BB_FEATURE_TRACEROUTE_VERBOSE
+
+static void
+send_probe(int seq, int ttl, struct timeval *tp)
+{
+ int cc;
+ struct udpiphdr *ui, *oui;
+ struct ip tip;
+
+ outip->ip_ttl = ttl;
+ outip->ip_id = htons(ident + seq);
+
+ /*
+ * In most cases, the kernel will recalculate the ip checksum.
+ * But we must do it anyway so that the udp checksum comes out
+ * right.
+ */
+ if (doipcksum) {
+ outip->ip_sum =
+ in_cksum((uint16_t *)outip, sizeof(*outip) + optlen);
+ if (outip->ip_sum == 0)
+ outip->ip_sum = 0xffff;
+ }
+
+ /* Payload */
+ outdata->seq = seq;
+ outdata->ttl = ttl;
+ memcpy(&outdata->tv, tp, sizeof(outdata->tv));
+
+#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
+ if (useicmp)
+ outicmp->icmp_seq = htons(seq);
+ else
+#endif
+ outudp->dest = htons(port + seq);
+
+#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
+ if (useicmp) {
+ /* Always calculate checksum for icmp packets */
+ outicmp->icmp_cksum = 0;
+ outicmp->icmp_cksum = in_cksum((uint16_t *)outicmp,
+ packlen - (sizeof(*outip) + optlen));
+ if (outicmp->icmp_cksum == 0)
+ outicmp->icmp_cksum = 0xffff;
+ } else
+#endif
+ if (doipcksum) {
+ /* Checksum (we must save and restore ip header) */
+ tip = *outip;
+ ui = (struct udpiphdr *)outip;
+ oui = (struct udpiphdr *)&tip;
+ /* Easier to zero and put back things that are ok */
+ memset((char *)ui, 0, sizeof(ui->ui_i));
+ ui->ui_src = oui->ui_src;
+ ui->ui_dst = oui->ui_dst;
+ ui->ui_pr = oui->ui_pr;
+ ui->ui_len = outudp->len;
+ outudp->check = 0;
+ outudp->check = in_cksum((uint16_t *)ui, packlen);
+ if (outudp->check == 0)
+ outudp->check = 0xffff;
+ *outip = tip;
+ }
+
+#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
+ /* XXX undocumented debugging hack */
+ if (verbose > 1) {
+ const uint16_t *sp;
+ int nshorts, i;
+
+ sp = (uint16_t *)outip;
+ nshorts = (u_int)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 !defined(IP_HDRINCL) && defined(IP_TTL)
+ if (setsockopt(sndsock, IPPROTO_IP, IP_TTL,
+ (char *)&ttl, sizeof(ttl)) < 0) {
+ bb_perror_msg_and_die("setsockopt ttl %d", ttl);
+ }
+#endif
+
+ cc = sendto(sndsock, (char *)outip,
+ packlen, 0, (struct sockaddr *)&whereto, sizeof(whereto));
+ if (cc < 0 || cc != packlen) {
+ if (cc < 0)
+ bb_perror_msg_and_die("sendto");
+ printf("%s: wrote %s %d chars, ret=%d\n",
+ applet_name, hostname, packlen, cc);
+ (void)fflush(stdout);
+ }
+}
+
+static inline double
+deltaT(struct timeval *t1p, struct timeval *t2p)
+{
+ double dt;
+
+ dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
+ (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
+ return dt;
+}
+
+#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
/*
* Convert an ICMP "type" field to a printable string.
*/
static inline const char *
-pr_type(t)
- u_char t;
+pr_type(unsigned char t)
{
static const char * const ttab[] = {
"Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable",
"Source Quench", "Redirect", "ICMP 6", "ICMP 7",
- "Echo", "ICMP 9", "ICMP 10", "Time Exceeded",
+ "Echo", "Router Advert", "Router Solicit", "Time Exceeded",
"Param Problem", "Timestamp", "Timestamp Reply", "Info Request",
- "Info Reply"
+ "Info Reply", "Mask Request", "Mask Reply"
};
- if(t > 16)
- return("OUT-OF-RANGE");
+ if (t > 18)
+ return "OUT-OF-RANGE";
- return(ttab[t]);
+ return ttab[t];
}
#endif
-static inline int
-packet_ok(u_char *buf, int cc, struct sockaddr_in *from, int seq)
+static int
+packet_ok(unsigned char *buf, int cc, struct sockaddr_in *from, int seq)
{
struct icmp *icp;
- u_char type, code;
+ unsigned char type, code;
int hlen;
struct ip *ip;
ip = (struct ip *) buf;
hlen = ip->ip_hl << 2;
if (cc < hlen + ICMP_MINLEN) {
-#ifdef BB_FEATURE_TRACEROUTE_VERBOSE
+#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
if (verbose)
printf("packet too short (%d bytes) from %s\n", cc,
inet_ntoa(from->sin_addr));
#endif
- return (0);
+ return 0;
}
cc -= hlen;
icp = (struct icmp *)(buf + hlen);
- type = icp->icmp_type; code = icp->icmp_code;
+ type = icp->icmp_type;
+ code = icp->icmp_code;
+ /* Path MTU Discovery (RFC1191) */
+ if (code != ICMP_UNREACH_NEEDFRAG)
+ pmtu = 0;
+ else {
+ pmtu = ntohs(icp->icmp_nextmtu);
+ }
if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) ||
- type == ICMP_UNREACH) {
+ type == ICMP_UNREACH || type == ICMP_ECHOREPLY) {
struct ip *hip;
struct udphdr *up;
hip = &icp->icmp_ip;
hlen = hip->ip_hl << 2;
- up = (struct udphdr *)((u_char *)hip + hlen);
- if (hlen + 12 <= cc && hip->ip_p == IPPROTO_UDP &&
- up->source == htons(ident) &&
- up->dest == htons(port+seq))
- return (type == ICMP_TIMXCEED? -1 : code+1);
+#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
+ if (useicmp) {
+ struct icmp *hicmp;
+
+ /* XXX */
+ if (type == ICMP_ECHOREPLY &&
+ icp->icmp_id == htons(ident) &&
+ icp->icmp_seq == htons(seq))
+ return -2;
+
+ hicmp = (struct icmp *)((unsigned char *)hip + hlen);
+ /* XXX 8 is a magic number */
+ if (hlen + 8 <= cc &&
+ hip->ip_p == IPPROTO_ICMP &&
+ hicmp->icmp_id == htons(ident) &&
+ hicmp->icmp_seq == htons(seq))
+ return (type == ICMP_TIMXCEED ? -1 : code + 1);
+ } else
+#endif
+ {
+ up = (struct udphdr *)((unsigned char *)hip + hlen);
+ /* XXX 8 is a magic number */
+ if (hlen + 12 <= cc &&
+ hip->ip_p == IPPROTO_UDP &&
+ up->source == htons(ident) &&
+ up->dest == htons(port + seq))
+ return (type == ICMP_TIMXCEED ? -1 : code + 1);
+ }
}
-#ifdef BB_FEATURE_TRACEROUTE_VERBOSE
+#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
if (verbose) {
int i;
- u_long *lp = (u_long *)&icp->icmp_ip;
+ u_int32_t *lp = (u_int32_t *)&icp->icmp_ip;
- printf("\n%d bytes from %s to %s: icmp type %d (%s) code %d\n",
- cc, inet_ntoa(from->sin_addr), inet_ntoa(ip->ip_dst),
- type, pr_type(type), icp->icmp_code);
- for (i = 4; i < cc ; i += sizeof(long))
- printf("%2d: x%8.8lx\n", i, *lp++);
+ printf("\n%d bytes from %s to "
+ "%s: icmp type %d (%s) code %d\n",
+ cc, inet_ntoa(from->sin_addr),
+ inet_ntoa(ip->ip_dst), type, pr_type(type), icp->icmp_code);
+ for (i = 4; i < cc ; i += sizeof(*lp))
+ printf("%2d: x%8.8x\n", i, *lp++);
}
#endif
- return(0);
+ return 0;
}
-static void /* not inline */
-send_probe(int seq, int ttl)
+
+/*
+ * Construct an Internet address representation.
+ * If the nflag has been supplied, give
+ * numeric value, otherwise try for symbolic name.
+ */
+static inline void
+inetname(struct sockaddr_in *from)
{
- struct opacket *op = outpacket;
- struct ip *ip = &op->ip;
- struct udphdr *up = &op->udp;
- int i;
- struct timezone tz;
+ const char *n = NULL;
+ const char *ina;
+ char name[257];
- ip->ip_off = 0;
- ip->ip_hl = sizeof(*ip) >> 2;
- ip->ip_p = IPPROTO_UDP;
- ip->ip_len = datalen;
- ip->ip_ttl = ttl;
- ip->ip_v = IPVERSION;
- ip->ip_id = htons(ident+seq);
-
- up->source = htons(ident);
- up->dest = htons(port+seq);
- up->len = htons((u_short)(datalen - sizeof(struct ip)));
- up->check = 0;
-
- op->seq = seq;
- op->ttl = ttl;
- (void) gettimeofday(&op->tv, &tz);
-
- i = sendto(sndsock, (char *)outpacket, datalen, 0, &whereto,
- sizeof(struct sockaddr));
- if (i < 0 || i != datalen) {
- if (i<0)
- perror("sendto");
- printf("traceroute: wrote %s %d chars, ret=%d\n", hostname,
- datalen, i);
- (void) fflush(stdout);
+ if (!nflag && from->sin_addr.s_addr != INADDR_ANY) {
+ if (INET_rresolve(name, sizeof(name), from, 0x4000, 0xffffffff) >= 0)
+ n = name;
}
+ ina = inet_ntoa(from->sin_addr);
+ if (nflag)
+ printf(" %s", ina);
+ else
+ printf(" %s (%s)", (n ? n : ina), ina);
}
+static inline void
+print(unsigned char *buf, int cc, struct sockaddr_in *from)
+{
+ struct ip *ip;
+ int hlen;
+
+ ip = (struct ip *) buf;
+ hlen = ip->ip_hl << 2;
+ cc -= hlen;
-int
-#ifndef BB_TRACEROUTE
-main(argc, argv)
-#else
-traceroute_main(argc, argv)
+ inetname(from);
+#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
+ if (verbose)
+ printf(" %d bytes to %s", cc, inet_ntoa (ip->ip_dst));
#endif
- int argc;
- char *argv[];
+}
+
+
+static struct hostinfo *
+gethostinfo(const char *host)
{
- extern char *optarg;
- extern int optind;
+ int n;
struct hostent *hp;
- struct sockaddr_in from, *to;
- int ch, i, on, probe, seq, tos, ttl;
+ struct hostinfo *hi;
+ char **p;
+ u_int32_t addr, *ap;
+
+ hi = xzalloc(sizeof(*hi));
+ addr = inet_addr(host);
+ if ((int32_t)addr != -1) {
+ hi->name = xstrdup(host);
+ hi->n = 1;
+ hi->addrs = xzalloc(sizeof(hi->addrs[0]));
+ hi->addrs[0] = addr;
+ return hi;
+ }
+
+ hp = xgethostbyname(host);
+ if (hp->h_addrtype != AF_INET || hp->h_length != 4)
+ bb_perror_msg_and_die("bad host %s", host);
+ hi->name = xstrdup(hp->h_name);
+ for (n = 0, p = hp->h_addr_list; *p != NULL; ++n, ++p)
+ continue;
+ hi->n = n;
+ hi->addrs = xzalloc(n * sizeof(hi->addrs[0]));
+ for (ap = hi->addrs, p = hp->h_addr_list; *p != NULL; ++ap, ++p)
+ memcpy(ap, *p, sizeof(*ap));
+ return hi;
+}
- int options = 0; /* socket options */
- char *source = 0;
+static void
+freehostinfo(struct hostinfo *hi)
+{
+ free(hi->name);
+ hi->name = NULL;
+ free((char *)hi->addrs);
+ free((char *)hi);
+}
+
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+static void
+getaddr(u_int32_t *ap, const char *host)
+{
+ struct hostinfo *hi;
+
+ hi = gethostinfo(host);
+ *ap = hi->addrs[0];
+ freehostinfo(hi);
+}
+#endif
+
+
+int
+traceroute_main(int argc, char *argv[])
+{
+ static const int on = 1;
+
+ int code, n;
+ unsigned char *outp;
+ u_int32_t *ap;
+ struct sockaddr_in *from = (struct sockaddr_in *)&wherefrom;
+ struct sockaddr_in *to = (struct sockaddr_in *)&whereto;
+ struct hostinfo *hi;
+ int ttl, probe, i;
+ int seq = 0;
+ int tos = 0;
+ char *tos_str = NULL;
+ char *source = NULL;
+ unsigned long op;
+
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+ int lsrr = 0;
+#endif
+ uint16_t off = 0;
+ struct IFADDRLIST *al;
+ char *device = NULL;
+ int max_ttl = 30;
+ char *max_ttl_str = NULL;
+ char *port_str = NULL;
int nprobes = 3;
+ char *nprobes_str = NULL;
+ char *waittime_str = NULL;
+ u_int pausemsecs = 0;
+ char *pausemsecs_str = NULL;
+ int first_ttl = 1;
+ char *first_ttl_str = NULL;
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+ llist_t *sourse_route_list = NULL;
+#endif
- on = 1;
- seq = tos = 0;
- to = (struct sockaddr_in *)&whereto;
- while ((ch = getopt(argc, argv, "dm:np:q:rs:t:w:v")) != EOF)
- switch(ch) {
- case 'd':
-#ifdef BB_FEATURE_TRACEROUTE_SO_DEBUG
- options |= SO_DEBUG;
+ opterr = 0;
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+ opt_complementary = "x-x:g::";
+#else
+ opt_complementary = "x-x";
#endif
- break;
- case 'm':
- max_ttl = atoi(optarg);
- if (max_ttl <= 1)
- error_msg_and_die("max ttl must be >1.");
- break;
- case 'n':
- nflag++;
- break;
- case 'p':
- port = atoi(optarg);
- if (port < 1)
- error_msg_and_die("port must be >0.");
- break;
- case 'q':
- nprobes = atoi(optarg);
- if (nprobes < 1)
- error_msg_and_die("nprobes must be >0.");
- break;
- case 'r':
- options |= SO_DONTROUTE;
- break;
- case 's':
- /*
- * set the ip source address of the outbound
- * probe (e.g., on a multi-homed host).
- */
- source = optarg;
- break;
- case 't':
- tos = atoi(optarg);
- if (tos < 0 || tos > 255)
- error_msg_and_die("tos must be 0 to 255.");
- break;
- case 'v':
-#ifdef BB_FEATURE_TRACEROUTE_VERBOSE
- verbose++;
+
+ op = getopt32(argc, argv, "FIlnrdvxt:i:m:p:q:s:w:z:f:"
+#define USAGE_OP_DONT_FRAGMNT (1<<0) /* F */
+#define USAGE_OP_USE_ICMP (1<<1) /* I */
+#define USAGE_OP_TTL_FLAG (1<<2) /* l */
+#define USAGE_OP_ADDR_NUM (1<<3) /* n */
+#define USAGE_OP_BYPASS_ROUTE (1<<4) /* r */
+#define USAGE_OP_DEBUG (1<<5) /* d */
+#define USAGE_OP_VERBOSE (1<<6) /* v */
+#define USAGE_OP_IP_CHKSUM (1<<7) /* x */
+
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+ "g:"
#endif
- break;
- case 'w':
- waittime = atoi(optarg);
- if (waittime <= 1)
- error_msg_and_die("wait must be >1 sec.");
- break;
- default:
- show_usage();
+ , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str,
+ &source, &waittime_str, &pausemsecs_str, &first_ttl_str
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+ , &sourse_route_list
+#endif
+ );
+
+ if (op & USAGE_OP_DONT_FRAGMNT)
+ off = IP_DF;
+#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
+ useicmp = op & USAGE_OP_USE_ICMP;
+#endif
+ nflag = op & USAGE_OP_ADDR_NUM;
+#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
+ verbose = op & USAGE_OP_VERBOSE;
+#endif
+ if (op & USAGE_OP_IP_CHKSUM) {
+ doipcksum = 0;
+ bb_error_msg("warning: ip checksums disabled");
+ }
+ if (tos_str)
+ tos = xatoul_range(tos_str, 0, 255);
+ if (max_ttl_str)
+ max_ttl = xatoul_range(max_ttl_str, 1, 255);
+ if (port_str)
+ port = xatou16(port_str);
+ if (nprobes_str)
+ nprobes = xatoul_range(nprobes_str, 1, INT_MAX);
+ if (source) {
+ /*
+ * set the ip source address of the outbound
+ * probe (e.g., on a multi-homed host).
+ */
+ if (getuid()) bb_error_msg_and_die("-s %s: permission denied", source);
+ }
+ if (waittime_str)
+ waittime = xatoul_range(waittime_str, 2, 24 * 60 * 60);
+ if (pausemsecs_str)
+ pausemsecs = xatoul_range(pausemsecs_str, 0, 60 * 60 * 1000);
+ if (first_ttl_str)
+ first_ttl = xatoul_range(first_ttl_str, 1, 255);
+
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+ if (sourse_route_list) {
+ llist_t *l_sr;
+
+ for (l_sr = sourse_route_list; l_sr; ) {
+ if (lsrr >= NGATEWAYS)
+ bb_error_msg_and_die("no more than %d gateways", NGATEWAYS);
+ getaddr(gwlist + lsrr, l_sr->data);
+ ++lsrr;
+ l_sr = l_sr->link;
+ free(sourse_route_list);
+ sourse_route_list = l_sr;
}
- argc -= optind;
- argv += optind;
-
- if (argc < 1)
- show_usage();
-
- setlinebuf (stdout);
-
- memset(&whereto, 0, sizeof(struct sockaddr));
- hp = xgethostbyname(*argv);
- to->sin_family = hp->h_addrtype;
- memcpy(&to->sin_addr, hp->h_addr, hp->h_length);
- hostname = (char *)hp->h_name;
- if (*++argv)
- datalen = atoi(*argv);
- if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket))
- error_msg_and_die("packet size must be 0 <= s < %d.",
- MAXPACKET - sizeof(struct opacket));
- datalen += sizeof(struct opacket);
- outpacket = (struct opacket *)xmalloc((unsigned)datalen);
- memset(outpacket, 0, datalen);
- outpacket->ip.ip_dst = to->sin_addr;
- outpacket->ip.ip_tos = tos;
- outpacket->ip.ip_v = IPVERSION;
- outpacket->ip.ip_id = 0;
+ optlen = (lsrr + 1) * sizeof(gwlist[0]);
+ }
+#endif
- ident = (getpid() & 0xffff) | 0x8000;
+ if (first_ttl > max_ttl) {
+ bb_error_msg_and_die(
+ "first ttl (%d) may not be greater than max ttl (%d)",
+ first_ttl, max_ttl);
+ }
- if ((sndsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
- perror_msg_and_die(can_not_create_raw_socket);
+ minpacket = sizeof(*outip) + sizeof(*outdata) + optlen;
- s = create_icmp_socket();
+#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
+ if (useicmp)
+ minpacket += 8; /* XXX magic number */
+ else
+#endif
+ minpacket += sizeof(*outudp);
+ packlen = minpacket; /* minimum sized packet */
+
+ /* Process destination and optional packet size */
+ switch (argc - optind) {
+
+ case 2:
+ packlen = xatoul_range(argv[optind + 1], minpacket, maxpacket);
+ /* Fall through */
+
+ case 1:
+ hostname = argv[optind];
+ hi = gethostinfo(hostname);
+ setsin(to, hi->addrs[0]);
+ if (hi->n > 1)
+ bb_error_msg("warning: %s has multiple addresses; using %s",
+ hostname, inet_ntoa(to->sin_addr));
+ hostname = hi->name;
+ hi->name = NULL;
+ freehostinfo(hi);
+ break;
-#ifdef BB_FEATURE_TRACEROUTE_SO_DEBUG
- if (options & SO_DEBUG)
- (void) setsockopt(s, SOL_SOCKET, SO_DEBUG,
- (char *)&on, sizeof(on));
+ default:
+ bb_show_usage();
+ }
+
+ /* Insure the socket fds won't be 0, 1 or 2 */
+ do n = xopen(bb_dev_null, O_RDONLY); while (n < 2);
+ if (n > 2)
+ close(n);
+
+ s = xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
+
+#if TRACEROUTE_SO_DEBUG
+ if (op & USAGE_OP_DEBUG)
+ (void)setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&on,
+ sizeof(on));
#endif
- if (options & SO_DONTROUTE)
- (void) setsockopt(s, SOL_SOCKET, SO_DONTROUTE,
- (char *)&on, sizeof(on));
+ if (op & USAGE_OP_BYPASS_ROUTE)
+ (void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, (char *)&on,
+ sizeof(on));
+
+ sndsock = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
+
+#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
+#if defined(IP_OPTIONS)
+ if (lsrr > 0) {
+ unsigned char optlist[MAX_IPOPTLEN];
+
+ /* final hop */
+ gwlist[lsrr] = to->sin_addr.s_addr;
+ ++lsrr;
+
+ /* force 4 byte alignment */
+ optlist[0] = IPOPT_NOP;
+ /* loose source route option */
+ optlist[1] = IPOPT_LSRR;
+ i = lsrr * sizeof(gwlist[0]);
+ optlist[2] = i + 3;
+ /* Pointer to LSRR addresses */
+ optlist[3] = IPOPT_MINOFF;
+ memcpy(optlist + 4, gwlist, i);
+
+ if ((setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS,
+ (char *)optlist, i + sizeof(gwlist[0]))) < 0) {
+ bb_perror_msg_and_die("IP_OPTIONS");
+ }
+ }
+#endif /* IP_OPTIONS */
+#endif /* CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE */
+
#ifdef SO_SNDBUF
- if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen,
- sizeof(datalen)) < 0)
- perror_msg_and_die("SO_SNDBUF");
-#endif SO_SNDBUF
+ if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&packlen,
+ sizeof(packlen)) < 0) {
+ bb_perror_msg_and_die("SO_SNDBUF");
+ }
+#endif
#ifdef IP_HDRINCL
if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, (char *)&on,
- sizeof(on)) < 0)
- perror_msg_and_die("IP_HDRINCL");
-#endif IP_HDRINCL
-#ifdef BB_FEATURE_TRACEROUTE_SO_DEBUG
- if (options & SO_DEBUG)
- (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
- (char *)&on, sizeof(on));
-#endif
- if (options & SO_DONTROUTE)
- (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
- (char *)&on, sizeof(on));
+ sizeof(on)) < 0 && errno != ENOPROTOOPT) {
+ bb_perror_msg_and_die("IP_HDRINCL");
+ }
+#else
+#ifdef IP_TOS
+ if (tos_str && setsockopt(sndsock, IPPROTO_IP, IP_TOS,
+ (char *)&tos, sizeof(tos)) < 0) {
+ bb_perror_msg_and_die("setsockopt tos %d", tos);
+ }
+#endif
+#endif
+#if TRACEROUTE_SO_DEBUG
+ if (op & USAGE_OP_DEBUG)
+ (void)setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, (char *)&on,
+ sizeof(on));
+#endif
+ if (op & USAGE_OP_BYPASS_ROUTE)
+ (void)setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, (char *)&on,
+ sizeof(on));
- if (source) {
- memset(&from, 0, sizeof(struct sockaddr));
- from.sin_family = AF_INET;
- from.sin_addr.s_addr = inet_addr(source);
- if (from.sin_addr.s_addr == -1)
- error_msg_and_die("unknown host %s", source);
- outpacket->ip.ip_src = from.sin_addr;
-#ifndef IP_HDRINCL
- if (bind(sndsock, (struct sockaddr *)&from, sizeof(from)) < 0)
- perror_msg_and_die("bind");
-#endif IP_HDRINCL
+ /* Revert to non-privileged user after opening sockets */
+ xsetgid(getgid());
+ xsetuid(getuid());
+
+ outip = xzalloc(packlen);
+
+ outip->ip_v = IPVERSION;
+ if (tos_str)
+ outip->ip_tos = tos;
+ outip->ip_len = htons(packlen);
+ outip->ip_off = htons(off);
+ outp = (unsigned char *)(outip + 1);
+ outip->ip_dst = to->sin_addr;
+
+ outip->ip_hl = (outp - (unsigned char *)outip) >> 2;
+ ident = (getpid() & 0xffff) | 0x8000;
+#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
+ if (useicmp) {
+ outip->ip_p = IPPROTO_ICMP;
+ outicmp = (struct icmp *)outp;
+ outicmp->icmp_type = ICMP_ECHO;
+ outicmp->icmp_id = htons(ident);
+ outdata = (struct outdata *)(outp + 8); /* XXX magic number */
+ } else
+#endif
+ {
+ outip->ip_p = IPPROTO_UDP;
+ outudp = (struct udphdr *)outp;
+ outudp->source = htons(ident);
+ outudp->len = htons((uint16_t)(packlen - (sizeof(*outip) + optlen)));
+ outdata = (struct outdata *)(outudp + 1);
+ }
+
+ /* Get the interface address list */
+ n = ifaddrlist(&al);
+
+ /* Look for a specific device */
+ if (device != NULL) {
+ for (i = n; i > 0; --i, ++al)
+ if (strcmp(device, al->device) == 0)
+ break;
+ if (i <= 0) {
+ bb_error_msg_and_die("can't find interface %s", device);
+ }
}
- fprintf(stderr, "traceroute to %s (%s)", hostname,
- inet_ntoa(to->sin_addr));
+ /* Determine our source address */
+ if (source == NULL) {
+ /*
+ * If a device was specified, use the interface address.
+ * Otherwise, try to determine our source address.
+ */
+ if (device != NULL)
+ setsin(from, al->addr);
+ findsaddr(to, from);
+ } else {
+ hi = gethostinfo(source);
+ source = hi->name;
+ hi->name = NULL;
+ /*
+ * If the device was specified make sure it
+ * corresponds to the source address specified.
+ * Otherwise, use the first address (and warn if
+ * there are more than one).
+ */
+ if (device != NULL) {
+ for (i = hi->n, ap = hi->addrs; i > 0; --i, ++ap)
+ if (*ap == al->addr)
+ break;
+ if (i <= 0) {
+ bb_error_msg_and_die(
+ "%s is not on interface %s",
+ source, device);
+ }
+ setsin(from, *ap);
+ } else {
+ setsin(from, hi->addrs[0]);
+ if (hi->n > 1)
+ bb_error_msg(
+ "Warning: %s has multiple addresses; using %s",
+ source, inet_ntoa(from->sin_addr));
+ }
+ freehostinfo(hi);
+ }
+
+ outip->ip_src = from->sin_addr;
+#ifndef IP_HDRINCL
+ xbind(sndsock, (struct sockaddr *)from, sizeof(*from));
+#endif
+
+ fprintf(stderr, "traceroute to %s (%s)", hostname, inet_ntoa(to->sin_addr));
if (source)
fprintf(stderr, " from %s", source);
- fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, datalen);
+ fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, packlen);
+ (void)fflush(stderr);
- for (ttl = 1; ttl <= max_ttl; ++ttl) {
- u_long lastaddr = 0;
+ for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
+ u_int32_t lastaddr = 0;
+ int gotlastaddr = 0;
int got_there = 0;
int unreachable = 0;
+ int sentfirst = 0;
printf("%2d ", ttl);
for (probe = 0; probe < nprobes; ++probe) {
- int cc, reset_timer;
+ int cc;
struct timeval t1, t2;
struct timezone tz;
struct ip *ip;
- (void) gettimeofday(&t1, &tz);
- send_probe(++seq, ttl);
- reset_timer = 1;
- while ((cc = wait_for_reply(s, &from, reset_timer)) != 0) {
- (void) gettimeofday(&t2, &tz);
- if ((i = packet_ok(packet, cc, &from, seq))) {
- reset_timer = 1;
- if (from.sin_addr.s_addr != lastaddr) {
- print(packet, cc, &from);
- lastaddr = from.sin_addr.s_addr;
- }
- printf(" %g ms", deltaT(&t1, &t2));
- switch(i - 1) {
- case ICMP_UNREACH_PORT:
- ip = (struct ip *)packet;
- if (ip->ip_ttl <= 1)
- printf(" !");
- ++got_there;
- break;
- case ICMP_UNREACH_NET:
- ++unreachable;
- printf(" !N");
- break;
- case ICMP_UNREACH_HOST:
- ++unreachable;
- printf(" !H");
- break;
- case ICMP_UNREACH_PROTOCOL:
- ++got_there;
- printf(" !P");
- break;
- case ICMP_UNREACH_NEEDFRAG:
- ++unreachable;
- printf(" !F");
- break;
- case ICMP_UNREACH_SRCFAIL:
- ++unreachable;
- printf(" !S");
- break;
- }
+ if (sentfirst && pausemsecs > 0)
+ usleep(pausemsecs * 1000);
+ (void)gettimeofday(&t1, &tz);
+ send_probe(++seq, ttl, &t1);
+ ++sentfirst;
+ while ((cc = wait_for_reply(s, from, &t1)) != 0) {
+ (void)gettimeofday(&t2, &tz);
+ i = packet_ok(packet, cc, from, seq);
+ /* Skip short packet */
+ if (i == 0)
+ continue;
+ if (!gotlastaddr ||
+ from->sin_addr.s_addr != lastaddr) {
+ print(packet, cc, from);
+ lastaddr = from->sin_addr.s_addr;
+ ++gotlastaddr;
+ }
+ printf(" %.3f ms", deltaT(&t1, &t2));
+ ip = (struct ip *)packet;
+ if (op & USAGE_OP_TTL_FLAG)
+ printf(" (%d)", ip->ip_ttl);
+ if (i == -2) {
+ if (ip->ip_ttl <= 1)
+ printf(" !");
+ ++got_there;
+ break;
+ }
+ /* time exceeded in transit */
+ if (i == -1)
+ break;
+ code = i - 1;
+ switch (code) {
+
+ case ICMP_UNREACH_PORT:
+ if (ip->ip_ttl <= 1)
+ printf(" !");
+ ++got_there;
+ break;
+
+ case ICMP_UNREACH_NET:
+ ++unreachable;
+ printf(" !N");
+ break;
+
+ case ICMP_UNREACH_HOST:
+ ++unreachable;
+ printf(" !H");
break;
- } else
- reset_timer = 0;
+
+ case ICMP_UNREACH_PROTOCOL:
+ ++got_there;
+ printf(" !P");
+ break;
+
+ case ICMP_UNREACH_NEEDFRAG:
+ ++unreachable;
+ printf(" !F-%d", pmtu);
+ break;
+
+ case ICMP_UNREACH_SRCFAIL:
+ ++unreachable;
+ printf(" !S");
+ break;
+
+ case ICMP_UNREACH_FILTER_PROHIB:
+ case ICMP_UNREACH_NET_PROHIB: /* misuse */
+ ++unreachable;
+ printf(" !A");
+ break;
+
+ case ICMP_UNREACH_HOST_PROHIB:
+ ++unreachable;
+ printf(" !C");
+ break;
+
+ case ICMP_UNREACH_HOST_PRECEDENCE:
+ ++unreachable;
+ printf(" !V");
+ break;
+
+ case ICMP_UNREACH_PRECEDENCE_CUTOFF:
+ ++unreachable;
+ printf(" !C");
+ break;
+
+ case ICMP_UNREACH_NET_UNKNOWN:
+ case ICMP_UNREACH_HOST_UNKNOWN:
+ ++unreachable;
+ printf(" !U");
+ break;
+
+ case ICMP_UNREACH_ISOLATED:
+ ++unreachable;
+ printf(" !I");
+ break;
+
+ case ICMP_UNREACH_TOSNET:
+ case ICMP_UNREACH_TOSHOST:
+ ++unreachable;
+ printf(" !T");
+ break;
+
+ default:
+ ++unreachable;
+ printf(" !<%d>", code);
+ break;
+ }
+ break;
}
if (cc == 0)
printf(" *");
- (void) fflush(stdout);
+ (void)fflush(stdout);
}
putchar('\n');
- if (got_there || unreachable >= nprobes-1)
- exit(0);
+ if (got_there ||
+ (unreachable > 0 && unreachable >= nprobes - 1))
+ break;
}
-
return 0;
}
projects / oweals / busybox.git / blobdiff