ff49597ed1
printing the details of a received ICMP packet. PR: bin/3766 Submitted by: denny1@home.com (Denton Gentry)
1235 lines
30 KiB
C
1235 lines
30 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Mike Muuss.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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/*
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static char sccsid[] = "@(#)ping.c 8.1 (Berkeley) 6/5/93";
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*/
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static const char rcsid[] =
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"$Id: ping.c,v 1.27 1997/08/07 02:41:15 julian Exp $";
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#endif /* not lint */
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/*
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* P I N G . C
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*
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* Using the InterNet Control Message Protocol (ICMP) "ECHO" facility,
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* measure round-trip-delays and packet loss across network paths.
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*
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* Author -
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* Mike Muuss
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* U. S. Army Ballistic Research Laboratory
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* December, 1983
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*
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* Status -
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* Public Domain. Distribution Unlimited.
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* Bugs -
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* More statistics could always be gathered.
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* This program has to run SUID to ROOT to access the ICMP socket.
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*/
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#include <sys/param.h> /* NB: we rely on this for <sys/types.h> */
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <math.h>
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#include <netdb.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <termios.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/ip_var.h>
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#include <arpa/inet.h>
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#define DEFDATALEN (64 - 8) /* default data length */
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#define FLOOD_BACKOFF 20000 /* usecs to back off if F_FLOOD mode */
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/* runs out of buffer space */
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#define MAXIPLEN 60
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#define MAXICMPLEN 76
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#define MAXPACKET (65536 - 60 - 8)/* max packet size */
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#define MAXWAIT 10 /* max seconds to wait for response */
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#define NROUTES 9 /* number of record route slots */
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#define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
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#define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
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#define SET(bit) (A(bit) |= B(bit))
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#define CLR(bit) (A(bit) &= (~B(bit)))
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#define TST(bit) (A(bit) & B(bit))
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/* various options */
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int options;
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#define F_FLOOD 0x0001
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#define F_INTERVAL 0x0002
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#define F_NUMERIC 0x0004
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#define F_PINGFILLED 0x0008
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#define F_QUIET 0x0010
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#define F_RROUTE 0x0020
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#define F_SO_DEBUG 0x0040
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#define F_SO_DONTROUTE 0x0080
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#define F_VERBOSE 0x0100
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#define F_QUIET2 0x0200
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#define F_NOLOOP 0x0400
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#define F_MTTL 0x0800
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#define F_MIF 0x1000
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#define F_AUDIBLE 0x2000
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/*
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* MAX_DUP_CHK is the number of bits in received table, i.e. the maximum
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* number of received sequence numbers we can keep track of. Change 128
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* to 8192 for complete accuracy...
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*/
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#define MAX_DUP_CHK (8 * 128)
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int mx_dup_ck = MAX_DUP_CHK;
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char rcvd_tbl[MAX_DUP_CHK / 8];
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struct sockaddr whereto; /* who to ping */
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int datalen = DEFDATALEN;
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int s; /* socket file descriptor */
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u_char outpack[MAXPACKET];
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char BSPACE = '\b'; /* characters written for flood */
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char DOT = '.';
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char *hostname;
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int ident; /* process id to identify our packets */
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int uid; /* cached uid for micro-optimization */
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/* counters */
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long npackets; /* max packets to transmit */
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long nreceived; /* # of packets we got back */
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long nrepeats; /* number of duplicates */
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long ntransmitted; /* sequence # for outbound packets = #sent */
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int interval = 1; /* interval between packets */
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/* timing */
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int timing; /* flag to do timing */
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double tmin = 999999999.0; /* minimum round trip time */
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double tmax = 0.0; /* maximum round trip time */
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double tsum = 0.0; /* sum of all times, for doing average */
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double tsumsq = 0.0; /* sum of all times squared, for std. dev. */
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volatile sig_atomic_t finish_up; /* nonzero if we've been told to finish up */
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int reset_kerninfo;
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volatile sig_atomic_t siginfo_p;
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static void fill(char *, char *);
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static u_short in_cksum(u_short *, int);
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static void catcher(int sig);
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static void check_status(void);
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static void finish(void) __dead2;
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static void pinger(void);
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static char *pr_addr(struct in_addr);
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static void pr_icmph(struct icmp *);
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static void pr_iph(struct ip *);
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static void pr_pack(char *, int, struct sockaddr_in *);
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static void pr_retip(struct ip *);
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static void status(int);
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static void stopit(int);
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static void tvsub(struct timeval *, struct timeval *);
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static void usage(const char *) __dead2;
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int
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main(argc, argv)
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int argc;
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char *const *argv;
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{
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struct timeval timeout;
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struct hostent *hp;
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struct sockaddr_in *to;
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struct termios ts;
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register int i;
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int ch, fdmask, hold, packlen, preload, sockerrno;
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struct in_addr ifaddr;
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unsigned char ttl, loop;
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u_char *datap, *packet;
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char *target, hnamebuf[MAXHOSTNAMELEN];
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char *ep;
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u_long ultmp;
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#ifdef IP_OPTIONS
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char rspace[3 + 4 * NROUTES + 1]; /* record route space */
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#endif
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struct sigaction si_sa;
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/*
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* Do the stuff that we need root priv's for *first*, and
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* then drop our setuid bit. Save error reporting for
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* after arg parsing.
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*/
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s = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
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sockerrno = errno;
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setuid(getuid());
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uid = getuid();
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preload = 0;
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datap = &outpack[8 + sizeof(struct timeval)];
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while ((ch = getopt(argc, argv, "I:LQRT:c:adfi:l:np:qrs:v")) != -1) {
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switch(ch) {
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case 'a':
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options |= F_AUDIBLE;
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break;
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case 'c':
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ultmp = strtoul(optarg, &ep, 0);
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if (*ep || ep == optarg || ultmp > LONG_MAX || !ultmp)
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errx(EX_USAGE,
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"invalid count of packets to transmit: `%s'",
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optarg);
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npackets = ultmp;
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break;
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case 'd':
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options |= F_SO_DEBUG;
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break;
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case 'f':
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if (getuid()) {
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errno = EPERM;
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err(EX_NOPERM, "-f flag");
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}
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options |= F_FLOOD;
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setbuf(stdout, (char *)NULL);
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break;
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case 'i': /* wait between sending packets */
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ultmp = strtoul(optarg, &ep, 0);
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if (*ep || ep == optarg || ultmp > INT_MAX)
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errx(EX_USAGE,
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"invalid timing interval: `%s'", optarg);
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options |= F_INTERVAL;
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interval = ultmp;
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break;
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case 'I': /* multicast interface */
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if (inet_aton(optarg, &ifaddr) == 0)
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errx(EX_USAGE,
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"invalid multicast interface: `%s'",
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optarg);
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options |= F_MIF;
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break;
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case 'l':
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ultmp = strtoul(optarg, &ep, 0);
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if (*ep || ep == optarg || ultmp > INT_MAX)
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errx(EX_USAGE,
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"invalid preload value: `%s'", optarg);
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if (getuid()) {
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errno = EPERM;
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err(EX_NOPERM, "-l flag");
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}
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options |= F_FLOOD;
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preload = ultmp;
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break;
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case 'L':
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options |= F_NOLOOP;
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loop = 0;
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break;
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case 'n':
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options |= F_NUMERIC;
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break;
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case 'p': /* fill buffer with user pattern */
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options |= F_PINGFILLED;
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fill((char *)datap, optarg);
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break;
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case 'Q':
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options |= F_QUIET2;
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break;
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case 'q':
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options |= F_QUIET;
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break;
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case 'R':
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options |= F_RROUTE;
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break;
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case 'r':
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options |= F_SO_DONTROUTE;
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break;
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case 's': /* size of packet to send */
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ultmp = strtoul(optarg, &ep, 0);
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if (ultmp > MAXPACKET)
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errx(EX_USAGE, "packet size too large: %lu",
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ultmp);
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if (*ep || ep == optarg || !ultmp)
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errx(EX_USAGE, "invalid packet size: `%s'",
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optarg);
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datalen = ultmp;
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break;
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case 'T': /* multicast TTL */
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ultmp = strtoul(optarg, &ep, 0);
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if (*ep || ep == optarg || ultmp > 255)
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errx(EX_USAGE, "invalid multicast TTL: `%s'",
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optarg);
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ttl = ultmp;
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options |= F_MTTL;
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break;
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case 'v':
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options |= F_VERBOSE;
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break;
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default:
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usage(argv[0]);
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}
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}
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if (argc - optind != 1)
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usage(argv[0]);
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target = argv[optind];
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bzero((char *)&whereto, sizeof(struct sockaddr));
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to = (struct sockaddr_in *)&whereto;
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to->sin_family = AF_INET;
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if (inet_aton(target, &to->sin_addr) != 0) {
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hostname = target;
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} else {
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hp = gethostbyname2(target, AF_INET);
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if (!hp)
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errx(EX_NOHOST, "cannot resolve %s: %s",
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target, hstrerror(h_errno));
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to->sin_len = sizeof *to;
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if (hp->h_length > sizeof(to->sin_addr))
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errx(1,"gethostbyname2 returned an illegal address");
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memcpy(&to->sin_addr, hp->h_addr_list[0], sizeof to->sin_addr);
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(void)strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1);
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hnamebuf[(sizeof hnamebuf) - 1] = '\0';
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hostname = hnamebuf;
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}
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if (options & F_FLOOD && options & F_INTERVAL)
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errx(EX_USAGE, "-f and -i: incompatible options");
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if (options & F_FLOOD && IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
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errx(EX_USAGE,
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"-f flag cannot be used with multicast destination");
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if (options & (F_MIF | F_NOLOOP | F_MTTL)
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&& !IN_MULTICAST(ntohl(to->sin_addr.s_addr)))
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errx(EX_USAGE,
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"-I, -L, -T flags cannot be used with unicast destination");
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if (datalen >= sizeof(struct timeval)) /* can we time transfer */
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timing = 1;
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packlen = datalen + MAXIPLEN + MAXICMPLEN;
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if (!(packet = (u_char *)malloc((size_t)packlen)))
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err(EX_UNAVAILABLE, "malloc");
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if (!(options & F_PINGFILLED))
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for (i = 8; i < datalen; ++i)
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*datap++ = i;
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ident = getpid() & 0xFFFF;
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if (s < 0) {
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errno = sockerrno;
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err(EX_OSERR, "socket");
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}
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hold = 1;
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if (options & F_SO_DEBUG)
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(void)setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&hold,
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sizeof(hold));
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if (options & F_SO_DONTROUTE)
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(void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, (char *)&hold,
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sizeof(hold));
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/* record route option */
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if (options & F_RROUTE) {
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#ifdef IP_OPTIONS
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rspace[IPOPT_OPTVAL] = IPOPT_RR;
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rspace[IPOPT_OLEN] = sizeof(rspace)-1;
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rspace[IPOPT_OFFSET] = IPOPT_MINOFF;
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if (setsockopt(s, IPPROTO_IP, IP_OPTIONS, rspace,
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sizeof(rspace)) < 0)
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err(EX_OSERR, "setsockopt IP_OPTIONS");
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#else
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errx(EX_UNAVAILABLE,
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"record route not available in this implementation");
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#endif /* IP_OPTIONS */
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}
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if (options & F_NOLOOP) {
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if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, &loop,
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sizeof(loop)) < 0) {
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err(EX_OSERR, "setsockopt IP_MULTICAST_LOOP");
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}
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}
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if (options & F_MTTL) {
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if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, &ttl,
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sizeof(ttl)) < 0) {
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err(EX_OSERR, "setsockopt IP_MULTICAST_TTL");
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}
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}
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if (options & F_MIF) {
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if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, &ifaddr,
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sizeof(ifaddr)) < 0) {
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err(EX_OSERR, "setsockopt IP_MULTICAST_IF");
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}
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}
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/*
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* When pinging the broadcast address, you can get a lot of answers.
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* Doing something so evil is useful if you are trying to stress the
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* ethernet, or just want to fill the arp cache to get some stuff for
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* /etc/ethers. But beware: RFC 1122 allows hosts to ignore broadcast
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* or multicast pings if they wish.
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*/
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hold = 48 * 1024;
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(void)setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&hold,
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sizeof(hold));
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if (to->sin_family == AF_INET)
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(void)printf("PING %s (%s): %d data bytes\n", hostname,
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inet_ntoa(to->sin_addr),
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datalen);
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else
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(void)printf("PING %s: %d data bytes\n", hostname, datalen);
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/*
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* Use sigaction() instead of signal() to get unambiguous semantics,
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* in particular with SA_RESTART not set.
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*/
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sigemptyset(&si_sa.sa_mask);
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si_sa.sa_flags = 0;
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si_sa.sa_handler = stopit;
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if (sigaction(SIGINT, &si_sa, 0) == -1) {
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err(EX_OSERR, "sigaction SIGINT");
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}
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si_sa.sa_handler = catcher;
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if (sigaction(SIGALRM, &si_sa, 0) == -1) {
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err(EX_OSERR, "sigaction SIGALRM");
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}
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si_sa.sa_handler = status;
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if (sigaction(SIGINFO, &si_sa, 0) == -1) {
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err(EX_OSERR, "sigaction");
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}
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if (tcgetattr(STDOUT_FILENO, &ts) != -1) {
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reset_kerninfo = !(ts.c_lflag & NOKERNINFO);
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ts.c_lflag |= NOKERNINFO;
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tcsetattr(STDOUT_FILENO, TCSANOW, &ts);
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}
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while (preload--) /* fire off them quickies */
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pinger();
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if ((options & F_FLOOD) == 0)
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catcher(0); /* start things going */
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|
|
while (!finish_up) {
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struct sockaddr_in from;
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register int cc;
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int fromlen;
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check_status();
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if (options & F_FLOOD) {
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pinger();
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timeout.tv_sec = 0;
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timeout.tv_usec = 10000;
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fdmask = 1 << s;
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if (select(s + 1, (fd_set *)&fdmask, (fd_set *)NULL,
|
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(fd_set *)NULL, &timeout) < 1)
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continue;
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}
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fromlen = sizeof(from);
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if ((cc = recvfrom(s, (char *)packet, packlen, 0,
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(struct sockaddr *)&from, &fromlen)) < 0) {
|
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if (errno == EINTR)
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continue;
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perror("ping: recvfrom");
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continue;
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}
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pr_pack((char *)packet, cc, &from);
|
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if (npackets && nreceived >= npackets)
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break;
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}
|
|
finish();
|
|
/* NOTREACHED */
|
|
exit(0); /* Make the compiler happy */
|
|
}
|
|
|
|
/*
|
|
* stopit --
|
|
* Set the global bit that causes the main loop to quit.
|
|
* Do NOT call finish() from here, since finish() does far too much
|
|
* to be called from a signal handler.
|
|
*/
|
|
void
|
|
stopit(sig)
|
|
int sig;
|
|
{
|
|
finish_up = 1;
|
|
}
|
|
|
|
/*
|
|
* catcher --
|
|
* This routine causes another PING to be transmitted, and then
|
|
* schedules another SIGALRM for 1 second from now.
|
|
*
|
|
* bug --
|
|
* Our sense of time will slowly skew (i.e., packets will not be
|
|
* launched exactly at 1-second intervals). This does not affect the
|
|
* quality of the delay and loss statistics.
|
|
*/
|
|
static void
|
|
catcher(int sig)
|
|
{
|
|
int waittime;
|
|
struct sigaction si_sa;
|
|
|
|
pinger();
|
|
|
|
if (!npackets || ntransmitted < npackets)
|
|
(void)alarm((u_int)interval);
|
|
else {
|
|
if (nreceived) {
|
|
waittime = 2 * tmax / 1000;
|
|
if (!waittime)
|
|
waittime = 1;
|
|
} else
|
|
waittime = MAXWAIT;
|
|
|
|
si_sa.sa_handler = stopit;
|
|
sigemptyset(&si_sa.sa_mask);
|
|
si_sa.sa_flags = 0;
|
|
if (sigaction(SIGALRM, &si_sa, 0) == -1) {
|
|
finish_up = 1;
|
|
return;
|
|
}
|
|
(void)alarm((u_int)waittime);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* pinger --
|
|
* Compose and transmit an ICMP ECHO REQUEST packet. The IP packet
|
|
* will be added on by the kernel. The ID field is our UNIX process ID,
|
|
* and the sequence number is an ascending integer. The first 8 bytes
|
|
* of the data portion are used to hold a UNIX "timeval" struct in host
|
|
* byte-order, to compute the round-trip time.
|
|
*
|
|
* bug --
|
|
* this does far too much to be called from a signal handler.
|
|
*/
|
|
static void
|
|
pinger(void)
|
|
{
|
|
register struct icmp *icp;
|
|
register int cc;
|
|
int i;
|
|
|
|
icp = (struct icmp *)outpack;
|
|
icp->icmp_type = ICMP_ECHO;
|
|
icp->icmp_code = 0;
|
|
icp->icmp_cksum = 0;
|
|
icp->icmp_seq = ntransmitted;
|
|
icp->icmp_id = ident; /* ID */
|
|
|
|
CLR(icp->icmp_seq % mx_dup_ck);
|
|
|
|
if (timing)
|
|
(void)gettimeofday((struct timeval *)&outpack[8],
|
|
(struct timezone *)NULL);
|
|
|
|
cc = datalen + 8; /* skips ICMP portion */
|
|
|
|
/* compute ICMP checksum here */
|
|
icp->icmp_cksum = in_cksum((u_short *)icp, cc);
|
|
|
|
i = sendto(s, (char *)outpack, cc, 0, &whereto,
|
|
sizeof(struct sockaddr));
|
|
|
|
if (i < 0 || i != cc) {
|
|
if (i < 0) {
|
|
if (options & F_FLOOD && errno == ENOBUFS) {
|
|
usleep(FLOOD_BACKOFF);
|
|
return;
|
|
}
|
|
warn("sendto");
|
|
} else {
|
|
warn("%s: partial write: %d of %d bytes",
|
|
hostname, cc, i);
|
|
}
|
|
}
|
|
ntransmitted++;
|
|
if (!(options & F_QUIET) && options & F_FLOOD)
|
|
(void)write(STDOUT_FILENO, &DOT, 1);
|
|
}
|
|
|
|
/*
|
|
* pr_pack --
|
|
* Print out the packet, if it came from us. This logic is necessary
|
|
* because ALL readers of the ICMP socket get a copy of ALL ICMP packets
|
|
* which arrive ('tis only fair). This permits multiple copies of this
|
|
* program to be run without having intermingled output (or statistics!).
|
|
*/
|
|
static void
|
|
pr_pack(buf, cc, from)
|
|
char *buf;
|
|
int cc;
|
|
struct sockaddr_in *from;
|
|
{
|
|
register struct icmp *icp;
|
|
register u_long l;
|
|
register int i, j;
|
|
register u_char *cp,*dp;
|
|
static int old_rrlen;
|
|
static char old_rr[MAX_IPOPTLEN];
|
|
struct ip *ip;
|
|
struct timeval tv, *tp;
|
|
double triptime;
|
|
int hlen, dupflag;
|
|
|
|
(void)gettimeofday(&tv, (struct timezone *)NULL);
|
|
|
|
/* Check the IP header */
|
|
ip = (struct ip *)buf;
|
|
hlen = ip->ip_hl << 2;
|
|
if (cc < hlen + ICMP_MINLEN) {
|
|
if (options & F_VERBOSE)
|
|
warn("packet too short (%d bytes) from %s", cc,
|
|
inet_ntoa(from->sin_addr));
|
|
return;
|
|
}
|
|
|
|
/* Now the ICMP part */
|
|
cc -= hlen;
|
|
icp = (struct icmp *)(buf + hlen);
|
|
if (icp->icmp_type == ICMP_ECHOREPLY) {
|
|
if (icp->icmp_id != ident)
|
|
return; /* 'Twas not our ECHO */
|
|
++nreceived;
|
|
triptime = 0.0;
|
|
if (timing) {
|
|
#ifndef icmp_data
|
|
tp = (struct timeval *)&icp->icmp_ip;
|
|
#else
|
|
tp = (struct timeval *)icp->icmp_data;
|
|
#endif
|
|
tvsub(&tv, tp);
|
|
triptime = ((double)tv.tv_sec) * 1000.0 +
|
|
((double)tv.tv_usec) / 1000.0;
|
|
tsum += triptime;
|
|
tsumsq += triptime * triptime;
|
|
if (triptime < tmin)
|
|
tmin = triptime;
|
|
if (triptime > tmax)
|
|
tmax = triptime;
|
|
}
|
|
|
|
if (TST(icp->icmp_seq % mx_dup_ck)) {
|
|
++nrepeats;
|
|
--nreceived;
|
|
dupflag = 1;
|
|
} else {
|
|
SET(icp->icmp_seq % mx_dup_ck);
|
|
dupflag = 0;
|
|
}
|
|
|
|
if (options & F_QUIET)
|
|
return;
|
|
|
|
if (options & F_FLOOD)
|
|
(void)write(STDOUT_FILENO, &BSPACE, 1);
|
|
else {
|
|
(void)printf("%d bytes from %s: icmp_seq=%u", cc,
|
|
inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr),
|
|
icp->icmp_seq);
|
|
(void)printf(" ttl=%d", ip->ip_ttl);
|
|
if (timing)
|
|
(void)printf(" time=%.3f ms", triptime);
|
|
if (dupflag)
|
|
(void)printf(" (DUP!)");
|
|
if (options & F_AUDIBLE)
|
|
(void)printf("\a");
|
|
/* check the data */
|
|
cp = (u_char*)&icp->icmp_data[8];
|
|
dp = &outpack[8 + sizeof(struct timeval)];
|
|
for (i = 8; i < datalen; ++i, ++cp, ++dp) {
|
|
if (*cp != *dp) {
|
|
(void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x",
|
|
i, *dp, *cp);
|
|
cp = (u_char*)&icp->icmp_data[0];
|
|
for (i = 8; i < datalen; ++i, ++cp) {
|
|
if ((i % 32) == 8)
|
|
(void)printf("\n\t");
|
|
(void)printf("%x ", *cp);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
/*
|
|
* We've got something other than an ECHOREPLY.
|
|
* See if it's a reply to something that we sent.
|
|
* We can compare IP destination, protocol,
|
|
* and ICMP type and ID.
|
|
*
|
|
* Only print all the error messages if we are running
|
|
* as root to avoid leaking information not normally
|
|
* available to those not running as root.
|
|
*/
|
|
#ifndef icmp_data
|
|
struct ip *oip = &icp->icmp_ip;
|
|
#else
|
|
struct ip *oip = (struct ip *)icp->icmp_data;
|
|
#endif
|
|
struct icmp *oicmp = (struct icmp *)(oip + 1);
|
|
|
|
if (((options & F_VERBOSE) && uid == 0) ||
|
|
(!(options & F_QUIET2) &&
|
|
(oip->ip_dst.s_addr ==
|
|
((struct sockaddr_in *)&whereto)->sin_addr.s_addr) &&
|
|
(oip->ip_p == IPPROTO_ICMP) &&
|
|
(oicmp->icmp_type == ICMP_ECHO) &&
|
|
(oicmp->icmp_id == ident))) {
|
|
(void)printf("%d bytes from %s: ", cc,
|
|
pr_addr(from->sin_addr));
|
|
pr_icmph(icp);
|
|
} else
|
|
return;
|
|
}
|
|
|
|
/* Display any IP options */
|
|
cp = (u_char *)buf + sizeof(struct ip);
|
|
|
|
for (; hlen > (int)sizeof(struct ip); --hlen, ++cp)
|
|
switch (*cp) {
|
|
case IPOPT_EOL:
|
|
hlen = 0;
|
|
break;
|
|
case IPOPT_LSRR:
|
|
(void)printf("\nLSRR: ");
|
|
hlen -= 2;
|
|
j = *++cp;
|
|
++cp;
|
|
if (j > IPOPT_MINOFF)
|
|
for (;;) {
|
|
l = *++cp;
|
|
l = (l<<8) + *++cp;
|
|
l = (l<<8) + *++cp;
|
|
l = (l<<8) + *++cp;
|
|
if (l == 0) {
|
|
printf("\t0.0.0.0");
|
|
} else {
|
|
struct in_addr ina;
|
|
ina.s_addr = ntohl(l);
|
|
printf("\t%s", pr_addr(ina));
|
|
}
|
|
hlen -= 4;
|
|
j -= 4;
|
|
if (j <= IPOPT_MINOFF)
|
|
break;
|
|
(void)putchar('\n');
|
|
}
|
|
break;
|
|
case IPOPT_RR:
|
|
j = *++cp; /* get length */
|
|
i = *++cp; /* and pointer */
|
|
hlen -= 2;
|
|
if (i > j)
|
|
i = j;
|
|
i -= IPOPT_MINOFF;
|
|
if (i <= 0)
|
|
continue;
|
|
if (i == old_rrlen
|
|
&& cp == (u_char *)buf + sizeof(struct ip) + 2
|
|
&& !bcmp((char *)cp, old_rr, i)
|
|
&& !(options & F_FLOOD)) {
|
|
(void)printf("\t(same route)");
|
|
i = ((i + 3) / 4) * 4;
|
|
hlen -= i;
|
|
cp += i;
|
|
break;
|
|
}
|
|
old_rrlen = i;
|
|
bcopy((char *)cp, old_rr, i);
|
|
(void)printf("\nRR: ");
|
|
for (;;) {
|
|
l = *++cp;
|
|
l = (l<<8) + *++cp;
|
|
l = (l<<8) + *++cp;
|
|
l = (l<<8) + *++cp;
|
|
if (l == 0) {
|
|
printf("\t0.0.0.0");
|
|
} else {
|
|
struct in_addr ina;
|
|
ina.s_addr = ntohl(l);
|
|
printf("\t%s", pr_addr(ina));
|
|
}
|
|
hlen -= 4;
|
|
i -= 4;
|
|
if (i <= 0)
|
|
break;
|
|
(void)putchar('\n');
|
|
}
|
|
break;
|
|
case IPOPT_NOP:
|
|
(void)printf("\nNOP");
|
|
break;
|
|
default:
|
|
(void)printf("\nunknown option %x", *cp);
|
|
break;
|
|
}
|
|
if (!(options & F_FLOOD)) {
|
|
(void)putchar('\n');
|
|
(void)fflush(stdout);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* in_cksum --
|
|
* Checksum routine for Internet Protocol family headers (C Version)
|
|
*/
|
|
u_short
|
|
in_cksum(addr, len)
|
|
u_short *addr;
|
|
int len;
|
|
{
|
|
register int nleft = len;
|
|
register u_short *w = addr;
|
|
register int sum = 0;
|
|
u_short answer = 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) {
|
|
*(u_char *)(&answer) = *(u_char *)w ;
|
|
sum += answer;
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/*
|
|
* tvsub --
|
|
* Subtract 2 timeval structs: out = out - in. Out is assumed to
|
|
* be >= in.
|
|
*/
|
|
static void
|
|
tvsub(out, in)
|
|
register struct timeval *out, *in;
|
|
{
|
|
if ((out->tv_usec -= in->tv_usec) < 0) {
|
|
--out->tv_sec;
|
|
out->tv_usec += 1000000;
|
|
}
|
|
out->tv_sec -= in->tv_sec;
|
|
}
|
|
|
|
/*
|
|
* status --
|
|
* Print out statistics when SIGINFO is received.
|
|
*/
|
|
|
|
static void
|
|
status(sig)
|
|
int sig;
|
|
{
|
|
siginfo_p = 1;
|
|
}
|
|
|
|
static void
|
|
check_status()
|
|
{
|
|
if (siginfo_p) {
|
|
siginfo_p = 0;
|
|
(void)fprintf(stderr,
|
|
"\r%ld/%ld packets received (%.0f%%) %.3f min / %.3f avg / %.3f max\n",
|
|
nreceived, ntransmitted,
|
|
ntransmitted ? nreceived * 100.0 / ntransmitted : 0.0,
|
|
nreceived ? tmin : 0.0,
|
|
nreceived + nrepeats ? tsum / (nreceived + nrepeats) : tsum,
|
|
tmax);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* finish --
|
|
* Print out statistics, and give up.
|
|
*/
|
|
static void
|
|
finish()
|
|
{
|
|
struct termios ts;
|
|
|
|
(void)signal(SIGINT, SIG_IGN);
|
|
(void)signal(SIGALRM, SIG_IGN);
|
|
(void)putchar('\n');
|
|
(void)fflush(stdout);
|
|
(void)printf("--- %s ping statistics ---\n", hostname);
|
|
(void)printf("%ld packets transmitted, ", ntransmitted);
|
|
(void)printf("%ld packets received, ", nreceived);
|
|
if (nrepeats)
|
|
(void)printf("+%ld duplicates, ", nrepeats);
|
|
if (ntransmitted)
|
|
if (nreceived > ntransmitted)
|
|
(void)printf("-- somebody's printing up packets!");
|
|
else
|
|
(void)printf("%d%% packet loss",
|
|
(int) (((ntransmitted - nreceived) * 100) /
|
|
ntransmitted));
|
|
(void)putchar('\n');
|
|
if (nreceived && timing) {
|
|
double n = nreceived + nrepeats;
|
|
double avg = tsum / n;
|
|
double vari = tsumsq / n - avg * avg;
|
|
printf("round-trip min/avg/max/stddev = "
|
|
"%.3f/%.3f/%.3f/%.3f ms\n",
|
|
tmin, avg, tmax, sqrt(vari));
|
|
}
|
|
if (reset_kerninfo && tcgetattr(STDOUT_FILENO, &ts) != -1) {
|
|
ts.c_lflag &= ~NOKERNINFO;
|
|
tcsetattr(STDOUT_FILENO, TCSANOW, &ts);
|
|
}
|
|
|
|
if (nreceived)
|
|
exit(0);
|
|
else
|
|
exit(2);
|
|
}
|
|
|
|
#ifdef notdef
|
|
static char *ttab[] = {
|
|
"Echo Reply", /* ip + seq + udata */
|
|
"Dest Unreachable", /* net, host, proto, port, frag, sr + IP */
|
|
"Source Quench", /* IP */
|
|
"Redirect", /* redirect type, gateway, + IP */
|
|
"Echo",
|
|
"Time Exceeded", /* transit, frag reassem + IP */
|
|
"Parameter Problem", /* pointer + IP */
|
|
"Timestamp", /* id + seq + three timestamps */
|
|
"Timestamp Reply", /* " */
|
|
"Info Request", /* id + sq */
|
|
"Info Reply" /* " */
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* pr_icmph --
|
|
* Print a descriptive string about an ICMP header.
|
|
*/
|
|
static void
|
|
pr_icmph(icp)
|
|
struct icmp *icp;
|
|
{
|
|
switch(icp->icmp_type) {
|
|
case ICMP_ECHOREPLY:
|
|
(void)printf("Echo Reply\n");
|
|
/* XXX ID + Seq + Data */
|
|
break;
|
|
case ICMP_UNREACH:
|
|
switch(icp->icmp_code) {
|
|
case ICMP_UNREACH_NET:
|
|
(void)printf("Destination Net Unreachable\n");
|
|
break;
|
|
case ICMP_UNREACH_HOST:
|
|
(void)printf("Destination Host Unreachable\n");
|
|
break;
|
|
case ICMP_UNREACH_PROTOCOL:
|
|
(void)printf("Destination Protocol Unreachable\n");
|
|
break;
|
|
case ICMP_UNREACH_PORT:
|
|
(void)printf("Destination Port Unreachable\n");
|
|
break;
|
|
case ICMP_UNREACH_NEEDFRAG:
|
|
(void)printf("frag needed and DF set (MTU %d)\n",
|
|
ntohs(icp->icmp_nextmtu));
|
|
break;
|
|
case ICMP_UNREACH_SRCFAIL:
|
|
(void)printf("Source Route Failed\n");
|
|
break;
|
|
case ICMP_UNREACH_FILTER_PROHIB:
|
|
(void)printf("Communication prohibited by filter\n");
|
|
break;
|
|
default:
|
|
(void)printf("Dest Unreachable, Bad Code: %d\n",
|
|
icp->icmp_code);
|
|
break;
|
|
}
|
|
/* Print returned IP header information */
|
|
#ifndef icmp_data
|
|
pr_retip(&icp->icmp_ip);
|
|
#else
|
|
pr_retip((struct ip *)icp->icmp_data);
|
|
#endif
|
|
break;
|
|
case ICMP_SOURCEQUENCH:
|
|
(void)printf("Source Quench\n");
|
|
#ifndef icmp_data
|
|
pr_retip(&icp->icmp_ip);
|
|
#else
|
|
pr_retip((struct ip *)icp->icmp_data);
|
|
#endif
|
|
break;
|
|
case ICMP_REDIRECT:
|
|
switch(icp->icmp_code) {
|
|
case ICMP_REDIRECT_NET:
|
|
(void)printf("Redirect Network");
|
|
break;
|
|
case ICMP_REDIRECT_HOST:
|
|
(void)printf("Redirect Host");
|
|
break;
|
|
case ICMP_REDIRECT_TOSNET:
|
|
(void)printf("Redirect Type of Service and Network");
|
|
break;
|
|
case ICMP_REDIRECT_TOSHOST:
|
|
(void)printf("Redirect Type of Service and Host");
|
|
break;
|
|
default:
|
|
(void)printf("Redirect, Bad Code: %d", icp->icmp_code);
|
|
break;
|
|
}
|
|
(void)printf("(New addr: %s)\n", inet_ntoa(icp->icmp_gwaddr));
|
|
#ifndef icmp_data
|
|
pr_retip(&icp->icmp_ip);
|
|
#else
|
|
pr_retip((struct ip *)icp->icmp_data);
|
|
#endif
|
|
break;
|
|
case ICMP_ECHO:
|
|
(void)printf("Echo Request\n");
|
|
/* XXX ID + Seq + Data */
|
|
break;
|
|
case ICMP_TIMXCEED:
|
|
switch(icp->icmp_code) {
|
|
case ICMP_TIMXCEED_INTRANS:
|
|
(void)printf("Time to live exceeded\n");
|
|
break;
|
|
case ICMP_TIMXCEED_REASS:
|
|
(void)printf("Frag reassembly time exceeded\n");
|
|
break;
|
|
default:
|
|
(void)printf("Time exceeded, Bad Code: %d\n",
|
|
icp->icmp_code);
|
|
break;
|
|
}
|
|
#ifndef icmp_data
|
|
pr_retip(&icp->icmp_ip);
|
|
#else
|
|
pr_retip((struct ip *)icp->icmp_data);
|
|
#endif
|
|
break;
|
|
case ICMP_PARAMPROB:
|
|
(void)printf("Parameter problem: pointer = 0x%02x\n",
|
|
icp->icmp_hun.ih_pptr);
|
|
#ifndef icmp_data
|
|
pr_retip(&icp->icmp_ip);
|
|
#else
|
|
pr_retip((struct ip *)icp->icmp_data);
|
|
#endif
|
|
break;
|
|
case ICMP_TSTAMP:
|
|
(void)printf("Timestamp\n");
|
|
/* XXX ID + Seq + 3 timestamps */
|
|
break;
|
|
case ICMP_TSTAMPREPLY:
|
|
(void)printf("Timestamp Reply\n");
|
|
/* XXX ID + Seq + 3 timestamps */
|
|
break;
|
|
case ICMP_IREQ:
|
|
(void)printf("Information Request\n");
|
|
/* XXX ID + Seq */
|
|
break;
|
|
case ICMP_IREQREPLY:
|
|
(void)printf("Information Reply\n");
|
|
/* XXX ID + Seq */
|
|
break;
|
|
case ICMP_MASKREQ:
|
|
(void)printf("Address Mask Request\n");
|
|
break;
|
|
case ICMP_MASKREPLY:
|
|
(void)printf("Address Mask Reply\n");
|
|
break;
|
|
case ICMP_ROUTERADVERT:
|
|
(void)printf("Router Advertisement\n");
|
|
break;
|
|
case ICMP_ROUTERSOLICIT:
|
|
(void)printf("Router Solicitation\n");
|
|
break;
|
|
default:
|
|
(void)printf("Bad ICMP type: %d\n", icp->icmp_type);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* pr_iph --
|
|
* Print an IP header with options.
|
|
*/
|
|
static void
|
|
pr_iph(ip)
|
|
struct ip *ip;
|
|
{
|
|
int hlen;
|
|
u_char *cp;
|
|
|
|
hlen = ip->ip_hl << 2;
|
|
cp = (u_char *)ip + 20; /* point to options */
|
|
|
|
(void)printf("Vr HL TOS Len ID Flg off TTL Pro cks Src Dst\n");
|
|
(void)printf(" %1x %1x %02x %04x %04x",
|
|
ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_len),
|
|
ntohs(ip->ip_id));
|
|
(void)printf(" %1lx %04lx", (ntohl(ip->ip_off) & 0xe000) >> 13,
|
|
ntohl(ip->ip_off) & 0x1fff);
|
|
(void)printf(" %02x %02x %04x", ip->ip_ttl, ip->ip_p,
|
|
ntohs(ip->ip_sum));
|
|
(void)printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_src.s_addr));
|
|
(void)printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_dst.s_addr));
|
|
/* dump any option bytes */
|
|
while (hlen-- > 20) {
|
|
(void)printf("%02x", *cp++);
|
|
}
|
|
(void)putchar('\n');
|
|
}
|
|
|
|
/*
|
|
* pr_addr --
|
|
* Return an ascii host address as a dotted quad and optionally with
|
|
* a hostname.
|
|
*/
|
|
static char *
|
|
pr_addr(ina)
|
|
struct in_addr ina;
|
|
{
|
|
struct hostent *hp;
|
|
static char buf[16 + 3 + MAXHOSTNAMELEN];
|
|
|
|
if ((options & F_NUMERIC) ||
|
|
!(hp = gethostbyaddr((char *)&ina, 4, AF_INET)))
|
|
return inet_ntoa(ina);
|
|
else
|
|
(void)snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name,
|
|
inet_ntoa(ina));
|
|
return(buf);
|
|
}
|
|
|
|
/*
|
|
* pr_retip --
|
|
* Dump some info on a returned (via ICMP) IP packet.
|
|
*/
|
|
static void
|
|
pr_retip(ip)
|
|
struct ip *ip;
|
|
{
|
|
int hlen;
|
|
u_char *cp;
|
|
|
|
pr_iph(ip);
|
|
hlen = ip->ip_hl << 2;
|
|
cp = (u_char *)ip + hlen;
|
|
|
|
if (ip->ip_p == 6)
|
|
(void)printf("TCP: from port %u, to port %u (decimal)\n",
|
|
(*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
|
|
else if (ip->ip_p == 17)
|
|
(void)printf("UDP: from port %u, to port %u (decimal)\n",
|
|
(*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3)));
|
|
}
|
|
|
|
static void
|
|
fill(bp, patp)
|
|
char *bp, *patp;
|
|
{
|
|
register int ii, jj, kk;
|
|
int pat[16];
|
|
char *cp;
|
|
|
|
for (cp = patp; *cp; cp++) {
|
|
if (!isxdigit(*cp))
|
|
errx(EX_USAGE,
|
|
"patterns must be specified as hex digits");
|
|
|
|
}
|
|
ii = sscanf(patp,
|
|
"%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x",
|
|
&pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6],
|
|
&pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12],
|
|
&pat[13], &pat[14], &pat[15]);
|
|
|
|
if (ii > 0)
|
|
for (kk = 0;
|
|
kk <= MAXPACKET - (8 + sizeof(struct timeval) + ii);
|
|
kk += ii)
|
|
for (jj = 0; jj < ii; ++jj)
|
|
bp[jj + kk] = pat[jj];
|
|
if (!(options & F_QUIET)) {
|
|
(void)printf("PATTERN: 0x");
|
|
for (jj = 0; jj < ii; ++jj)
|
|
(void)printf("%02x", bp[jj] & 0xFF);
|
|
(void)printf("\n");
|
|
}
|
|
}
|
|
|
|
static void
|
|
usage(argv0)
|
|
const char *argv0;
|
|
{
|
|
if (strrchr(argv0,'/'))
|
|
argv0 = strrchr(argv0,'/') + 1;
|
|
fprintf(stderr,
|
|
"usage: %s [-QRadfnqrv] [-c count] [-i wait] [-l preload] "
|
|
"[-p pattern]\n [-s packetsize] "
|
|
"[host | [-L] [-I iface] [-T ttl] mcast-group]\n",
|
|
argv0);
|
|
exit(EX_USAGE);
|
|
}
|