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Diffstat (limited to 'contrib/traceroute/traceroute.c')
-rw-r--r-- | contrib/traceroute/traceroute.c | 977 |
1 files changed, 977 insertions, 0 deletions
diff --git a/contrib/traceroute/traceroute.c b/contrib/traceroute/traceroute.c new file mode 100644 index 0000000..21612f8 --- /dev/null +++ b/contrib/traceroute/traceroute.c @@ -0,0 +1,977 @@ +/* + * Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996 + * The Regents of the University of California. All rights reserved. + * + * 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. + */ + +#ifndef lint +static const char copyright[] = + "@(#) Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996\n\ +The Regents of the University of California. All rights reserved.\n"; +static const char rcsid[] = + "@(#)$Header: traceroute.c,v 1.43 96/09/27 20:08:10 leres Exp $ (LBL)"; +#endif + +/* + * 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 + */ + +#include <sys/param.h> +#include <sys/file.h> +#include <sys/ioctl.h> +#ifdef HAVE_SYS_SELECT_H +#include <sys/select.h> +#endif +#include <sys/socket.h> +#include <sys/time.h> + +#include <netinet/in_systm.h> +#include <netinet/in.h> +#include <netinet/ip.h> +#include <netinet/ip_var.h> +#include <netinet/ip_icmp.h> +#include <netinet/udp.h> + +#include <arpa/inet.h> + +#include <ctype.h> +#include <errno.h> +#ifdef HAVE_MALLOC_H +#include <malloc.h> +#endif +#include <memory.h> +#include <netdb.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "gnuc.h" +#ifdef HAVE_OS_PROTO_H +#include "os-proto.h" +#endif + +/* Maximum number of gateways (include room for one noop) */ +#define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(u_int32_t))) + +#ifndef MAXHOSTNAMELEN +#define MAXHOSTNAMELEN 64 +#endif + +#define Fprintf (void)fprintf +#define Printf (void)printf + +/* Data section of the probe packet */ +struct outdata { + u_char seq; /* sequence number of this packet */ + u_char ttl; /* ttl packet left with */ + struct timeval tv; /* time packet left */ +}; + +u_char packet[512]; /* last inbound (icmp) packet */ + +struct ip *outip; /* last output (udp) packet */ +struct udphdr *outudp; /* last output (udp) packet */ +struct outdata *outdata; /* last output (udp) packet */ + +/* loose source route gateway list (including room for final destination) */ +u_int32_t gwlist[NGATEWAYS + 1]; + +int s; /* receive (icmp) socket file descriptor */ +int sndsock; /* send (udp) socket file descriptor */ + +struct sockaddr whereto; /* Who to try to reach */ +int packlen; /* total length of packet */ +int maxpacket = 32 * 1024; /* max ip packet size */ + +char *prog; +char *source; +char *hostname; + +int nprobes = 3; +int max_ttl = 30; +u_short ident; +u_short port = 32768 + 666; /* start udp dest port # for probe packets */ + +int options; /* socket options */ +int verbose; +int waittime = 5; /* time to wait for response (in seconds) */ +int nflag; /* print addresses numerically */ + +extern int optind; +extern int opterr; +extern char *optarg; + +/* Forwards */ +double deltaT(struct timeval *, struct timeval *); +char *inetname(struct in_addr); +int main(int, char **); +int packet_ok(u_char *, int, struct sockaddr_in *, int); +char *pr_type(u_char); +void print(u_char *, int, struct sockaddr_in *); +char *getaddr(u_int32_t *, char *); +char *getsin(struct sockaddr_in *, char *); +char *savestr(const char *); +void send_probe(int, int, struct timeval *); +void tvsub(struct timeval *, struct timeval *); +__dead void usage(void); +int wait_for_reply(int, struct sockaddr_in *, struct timeval *); + +int +main(int argc, char **argv) +{ + register int op, code; + register char *cp; + struct sockaddr_in from; + register struct sockaddr_in *to = (struct sockaddr_in *)&whereto; + int on = 1; + register struct protoent *pe; + register int ttl, probe, i; + register int seq = 0; + register int tos = 0; + register int lsrr = 0; + register int optlen = 0; + + if ((cp = strrchr(argv[0], '/')) != NULL) + prog = cp + 1; + else + prog = argv[0]; + + opterr = 0; + while ((op = getopt(argc, argv, "dnrvg:m:p:q:s:t:w:")) != EOF) + switch (op) { + + case 'd': + options |= SO_DEBUG; + break; + + case 'g': + if (lsrr >= NGATEWAYS) { + Fprintf(stderr, + "%s: No more than %d gateways\n", + prog, NGATEWAYS); + exit(1); + } + (void)getaddr(gwlist + lsrr, optarg); + ++lsrr; + break; + + case 'm': + max_ttl = atoi(optarg); + if (max_ttl <= 1) { + Fprintf(stderr, "%s: max ttl must be > 1\n", + prog); + exit(1); + } + break; + + case 'n': + ++nflag; + break; + + case 'p': + port = atoi(optarg); + if (port <= 0) { + Fprintf(stderr, "%s: port must be > 0\n", prog); + exit(1); + } + break; + + case 'q': + nprobes = atoi(optarg); + if (nprobes <= 0) { + Fprintf(stderr, "%s: nprobes must be > 0\n", + prog); + exit(1); + } + 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) { + Fprintf(stderr, "%s: tos must be 0 to 255\n", + prog); + exit(1); + } + break; + + case 'v': + ++verbose; + break; + + case 'w': + waittime = atoi(optarg); + if (waittime <= 1) { + Fprintf(stderr, "%s: wait must be > 1 sec\n", + prog); + exit(1); + } + break; + + default: + usage(); + } + + /* Process destination and optional packet size */ + switch (argc - optind) { + + case 2: + packlen = atoi(argv[optind + 1]); + /* Fall thorugh */ + + case 1: + hostname = savestr(getsin(to, argv[optind])); + break; + + default: + usage(); + } + +#ifdef HAVE_SETLINEBUF + setlinebuf (stdout); +#else + setvbuf(stdout, NULL, _IOLBF, 0); +#endif + + if (lsrr > 0) + optlen = (lsrr + 1) * sizeof(gwlist[0]); + i = sizeof(*outip) + sizeof(*outudp) + sizeof(*outdata) + optlen; + if (packlen == 0) + packlen = i; /* minimum sized packet */ + else if (i > packlen || packlen > maxpacket) { + Fprintf(stderr, "%s: packet size must be %d <= s <= %d\n", + prog, i, maxpacket); + exit(1); + } + + outip = (struct ip *)malloc((unsigned)packlen); + if (outip == NULL) { + Fprintf(stderr, "%s: malloc: %s\n", prog, strerror(errno)); + exit(1); + } + memset((char *)outip, 0, packlen); + + outip->ip_v = IPVERSION; + outip->ip_tos = tos; +#ifdef BYTESWAP_IP_LEN + outip->ip_len = htons(packlen); +#else + outip->ip_len = packlen; +#endif + outip->ip_p = IPPROTO_UDP; + outudp = (struct udphdr *)(outip + 1); +#ifdef HAVE_RAW_OPTIONS + if (lsrr > 0) { + register u_char *optlist; + + optlist = (u_char *)outudp; + (u_char *)outudp += optlen; + + /* final hop */ + gwlist[lsrr] = to->sin_addr.s_addr; + + outip->ip_dst.s_addr = gwlist[0]; + + /* 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 + 1, i); + } else +#endif + outip->ip_dst = to->sin_addr; + + outip->ip_hl = ((u_char *)outudp - (u_char *)outip) >> 2; + + ident = (getpid() & 0xffff) | 0x8000; + outudp->uh_sport = htons(ident); + outudp->uh_ulen = htons((u_short)(packlen - (sizeof(*outip) + optlen))); + + outdata = (struct outdata *)(outudp + 1); + + cp = "icmp"; + if ((pe = getprotobyname(cp)) == NULL) { + Fprintf(stderr, "%s: unknown protocol %s\n", prog, cp); + exit(1); + } + if ((s = socket(AF_INET, SOCK_RAW, pe->p_proto)) < 0) { + Fprintf(stderr, "%s: icmp socket: %s\n", prog, strerror(errno)); + exit(1); + } + if (options & SO_DEBUG) + (void)setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&on, + sizeof(on)); + if (options & SO_DONTROUTE) + (void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, (char *)&on, + sizeof(on)); + + if ((sndsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) { + Fprintf(stderr, "%s: raw socket: %s\n", prog, strerror(errno)); + exit(1); + } + + /* Revert to non-privileged user after opening sockets */ + setuid(getuid()); + +#if defined(IP_OPTIONS) && !defined(HAVE_RAW_OPTIONS) + if (lsrr > 0) { + u_char optlist[MAX_IPOPTLEN]; + + cp = "ip"; + if ((pe = getprotobyname(cp)) == NULL) { + Fprintf(stderr, "%s: unknown protocol %s\n", prog, cp); + exit(1); + } + + /* 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, pe->p_proto, IP_OPTIONS, optlist, + i + sizeof(gwlist[0]))) < 0) { + Fprintf(stderr, "%s: IP_OPTIONS: %s\n", + prog, strerror(errno)); + exit(1); + } + } +#endif + +#ifdef SO_SNDBUF + if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&packlen, + sizeof(packlen)) < 0) { + Fprintf(stderr, "%s: SO_SNDBUF: %s\n", prog, strerror(errno)); + exit(1); + } +#endif +#ifdef IP_HDRINCL + if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, (char *)&on, + sizeof(on)) < 0) { + Fprintf(stderr, "%s: IP_HDRINCL: %s\n", prog, strerror(errno)); + exit(1); + } +#endif + if (options & SO_DEBUG) + (void)setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, (char *)&on, + sizeof(on)); + if (options & SO_DONTROUTE) + (void)setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, (char *)&on, + sizeof(on)); + + if (source != NULL) { + source = savestr(getsin(&from, source)); + outip->ip_src = from.sin_addr; +#ifndef IP_HDRINCL + if (bind(sndsock, (struct sockaddr *)&from, sizeof(from)) < 0) { + Fprintf(stderr, "%s: bind: %s\n", + prog, strerror(errno)); + exit (1); + } +#endif + } + + Fprintf(stderr, "%s to %s (%s)", + prog, hostname, inet_ntoa(to->sin_addr)); + if (source) + Fprintf(stderr, " from %s", source); + Fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, packlen); + (void)fflush(stderr); + + for (ttl = 1; ttl <= max_ttl; ++ttl) { + u_int32_t lastaddr = 0; + int got_there = 0; + int unreachable = 0; + + Printf("%2d ", ttl); + for (probe = 0; probe < nprobes; ++probe) { + register int cc; + struct timeval t1, t2; + struct timezone tz; + register struct ip *ip; + + (void)gettimeofday(&t1, &tz); + send_probe(++seq, ttl, &t1); + 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 (from.sin_addr.s_addr != lastaddr) { + print(packet, cc, &from); + lastaddr = from.sin_addr.s_addr; + } + Printf(" %.3f ms", deltaT(&t1, &t2)); + /* time exceeded in transit */ + if (i == -1) + break; + code = i - 1; + switch (code) { + + case ICMP_UNREACH_PORT: +#ifndef ARCHAIC + ip = (struct ip *)packet; + if (ip->ip_ttl <= 1) + Printf(" !"); +#endif + ++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; + +/* rfc1716 */ +#ifndef ICMP_UNREACH_FILTER_PROHIB +#define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohibited filter */ +#endif + case ICMP_UNREACH_FILTER_PROHIB: + ++unreachable; + Printf(" !X"); + break; + + default: + ++unreachable; + Printf(" !<%d>", code); + break; + } + break; + } + if (cc == 0) + Printf(" *"); + (void)fflush(stdout); + } + putchar('\n'); + if (got_there || + (unreachable > 0 && unreachable >= nprobes - 1)) + break; + } + exit(0); +} + +int +wait_for_reply(register int sock, register struct sockaddr_in *fromp, + register struct timeval *tp) +{ + fd_set fds; + struct timeval now, wait; + struct timezone tz; + register int cc = 0; + int fromlen = sizeof(*fromp); + + FD_ZERO(&fds); + FD_SET(sock, &fds); + + wait.tv_sec = tp->tv_sec + waittime; + wait.tv_usec = tp->tv_usec; + (void)gettimeofday(&now, &tz); + tvsub(&wait, &now); + + if (select(sock + 1, &fds, (fd_set *)0, (fd_set *)0, &wait) > 0) + cc = recvfrom(s, (char *)packet, sizeof(packet), 0, + (struct sockaddr *)fromp, &fromlen); + + return(cc); +} + +void +send_probe(register int seq, register int ttl, register struct timeval *tp) +{ + register int i; + + outip->ip_ttl = ttl; + outip->ip_id = htons(ident + seq); + + outudp->uh_dport = htons(port + seq); + + outdata->seq = seq; + outdata->ttl = ttl; + outdata->tv = *tp; + + i = sendto(sndsock, (char *)outip, packlen, 0, &whereto, + sizeof(whereto)); + if (i < 0 || i != packlen) { + if (i < 0) + Fprintf(stderr, "%s: sendto: %s\n", + prog, strerror(errno)); + Printf("%s: wrote %s %d chars, ret=%d\n", + prog, hostname, packlen, i); + (void)fflush(stdout); + } +} + +double +deltaT(struct timeval *t1p, struct timeval *t2p) +{ + register double dt; + + dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + + (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; + return (dt); +} + +/* + * Convert an ICMP "type" field to a printable string. + */ +char * +pr_type(register u_char t) +{ + static char *ttab[] = { + "Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable", + "Source Quench", "Redirect", "ICMP 6", "ICMP 7", + "Echo", "ICMP 9", "ICMP 10", "Time Exceeded", + "Param Problem", "Timestamp", "Timestamp Reply", "Info Request", + "Info Reply" + }; + + if (t > 16) + return("OUT-OF-RANGE"); + + return(ttab[t]); +} + +int +packet_ok(register u_char *buf, int cc, register struct sockaddr_in *from, + register int seq) +{ + register struct icmp *icp; + register u_char type, code; + register int hlen; +#ifndef ARCHAIC + register struct ip *ip; + + ip = (struct ip *) buf; + hlen = ip->ip_hl << 2; + if (cc < hlen + ICMP_MINLEN) { + if (verbose) + Printf("packet too short (%d bytes) from %s\n", cc, + inet_ntoa(from->sin_addr)); + return (0); + } + cc -= hlen; + icp = (struct icmp *)(buf + hlen); +#else + icp = (struct icmp *)buf; +#endif + type = icp->icmp_type; + code = icp->icmp_code; + if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) || + type == ICMP_UNREACH) { + 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->uh_sport == htons(ident) && + up->uh_dport == htons(port + seq)) + return (type == ICMP_TIMXCEED ? -1 : code + 1); + } +#ifndef ARCHAIC + if (verbose) { + register int i; + u_int32_t *lp = (u_int32_t *)&icp->icmp_ip; + + Printf("\n%d bytes from %s to ", cc, inet_ntoa(from->sin_addr)); + Printf("%s: icmp type %d (%s) code %d\n", + 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); +} + + +void +print(register u_char *buf, register int cc, register struct sockaddr_in *from) +{ + register struct ip *ip; + register int hlen; + + 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)); + + if (verbose) + Printf(" %d bytes to %s", cc, inet_ntoa (ip->ip_dst)); +} + + +#ifdef notyet +/* + * Checksum routine for Internet Protocol family headers (C Version) + */ +in_cksum(register u_short *addr, register int len) +{ + register int nleft = len; + register u_short *w = addr; + register u_short answer; + register 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; + } + + /* mop up an odd byte, if necessary */ + if (nleft == 1) + sum += *(u_char *)w; + + /* + * 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); +} +#endif + +/* + * Subtract 2 timeval structs: out = out - in. + * Out is assumed to be >= in. + */ +void +tvsub(register struct timeval *out, register struct timeval *in) +{ + + if ((out->tv_usec -= in->tv_usec) < 0) { + --out->tv_sec; + out->tv_usec += 1000000; + } + out->tv_sec -= in->tv_sec; +} + +/* + * Construct an Internet address representation. + * If the nflag has been supplied, give + * numeric value, otherwise try for symbolic name. + */ +char * +inetname(struct in_addr in) +{ + register char *cp; + register struct hostent *hp; + static int first = 1; + static char domain[MAXHOSTNAMELEN + 1], line[MAXHOSTNAMELEN + 1]; + + if (first && !nflag) { + first = 0; + if (gethostname(domain, MAXHOSTNAMELEN) == 0 && + (cp = strchr(domain, '.')) != NULL) { + (void)strncpy(domain, cp + 1, sizeof(domain) - 1); + domain[sizeof(domain) - 1] = '\0'; + } else + domain[0] = '\0'; + } + if (!nflag && in.s_addr != INADDR_ANY) { + hp = gethostbyaddr((char *)&in, sizeof(in), AF_INET); + if (hp != NULL) { + if ((cp = strchr(hp->h_name, '.')) != NULL && + strcmp(cp + 1, domain) == 0) + *cp = '\0'; + (void)strncpy(line, hp->h_name, sizeof(line) - 1); + line[sizeof(line) - 1] = '\0'; + return (line); + } + } + return (inet_ntoa(in)); +} + +char * +getaddr(register u_int32_t *ap, register char *hostname) +{ + register struct hostent *hp; + + *ap = inet_addr(hostname); + if ((int32_t)*ap != -1) + return (hostname); + + hp = gethostbyname(hostname); + if (hp == NULL) { + Fprintf(stderr, "%s: unknown host %s\n", prog, hostname); + exit(1); + } + if (hp->h_addrtype != AF_INET || hp->h_length != 4) { + Fprintf(stderr, "%s: bad host %s\n", prog, hostname); + exit(1); + } + memcpy((caddr_t)ap, hp->h_addr, hp->h_length); + return (hp->h_name); +} + +char * +getsin(register struct sockaddr_in *sin, register char *hostname) +{ + + memset(sin, 0, sizeof(*sin)); + sin->sin_family = AF_INET; + return (getaddr((u_int32_t *)&sin->sin_addr.s_addr, hostname)); +} + +char * +savestr(register const char *str) +{ + register char *cp; + + cp = strdup(str); + if (cp == NULL) { + Fprintf(stderr, "%s: strdup: %s\n", prog, strerror(errno)); + exit(1); + } + return (cp); +} + +__dead void +usage(void) +{ + extern char version[]; + + Fprintf(stderr, "Version %s\n", version); + Fprintf(stderr, "Usage: %s [-dnrv] [-w wait] [-m max_ttl] [-p port#] \ +[-q nqueries]\n\t [-t tos] [-s src_addr] [-g gateway] host [data_size]\n", + prog); + exit(1); +} |