networking/ping6.c - codeaurora/busybox - Gitiles

 /* vi: set sw=4 ts=4: */
 /*
  * $Id: ping6.c,v 1.6 2004/03/15 08:28:48 andersen Exp $
  * Mini ping implementation for busybox
  *
  * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
  *
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  *
  * This version of ping is adapted from the ping in netkit-base 0.10,
  * which is:
  *
  * Copyright (c) 1989 The Regents of the University of California.
  * All rights reserved.
  *
  * This code is derived from software contributed to Berkeley by
  * Mike Muuss.
  *
  * Original copyright notice is retained at the end of this file.
  *
  * This version is an adaptation of ping.c from busybox.
  * The code was modified by Bart Visscher <magick@linux-fan.com>
  */

 #include <sys/param.h>
 #include <sys/socket.h>
 #include <sys/file.h>
 #include <sys/times.h>
 #include <signal.h>

 #include <netinet/in.h>
 #include <netinet/ip6.h>
 #include <netinet/icmp6.h>
 #include <arpa/inet.h>
 #include <net/if.h>
 #include <netdb.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <unistd.h>
 #include <string.h>
 #include <stdlib.h>
 #include <stddef.h>				/* offsetof */
 #include "busybox.h"

 enum {
 	DEFDATALEN = 56,
 	MAXIPLEN = 60,
 	MAXICMPLEN = 76,
 	MAXPACKET = 65468,
 	MAX_DUP_CHK = (8 * 128),
 	MAXWAIT = 10,
 	PINGINTERVAL = 1		/* second */
 };

 #define O_QUIET         (1 << 0)
 #define O_VERBOSE       (1 << 1)

 #define	A(bit)		rcvd_tbl[(bit)>>3]	/* identify byte in array */
 #define	B(bit)		(1 << ((bit) & 0x07))	/* identify bit in byte */
 #define	SET(bit)	(A(bit) |= B(bit))
 #define	CLR(bit)	(A(bit) &= (~B(bit)))
 #define	TST(bit)	(A(bit) & B(bit))

 static void ping(const char *host);

 /* simple version */
 #ifndef CONFIG_FEATURE_FANCY_PING6
 static struct hostent *h;

 static void noresp(int ign)
 {
 	printf("No response from %s\n", h->h_name);
 	exit(EXIT_FAILURE);
 }

 static void ping(const char *host)
 {
 	struct sockaddr_in6 pingaddr;
 	struct icmp6_hdr *pkt;
 	int pingsock, c;
 	int sockopt;
 	char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];

 	pingsock = create_icmp6_socket();

 	memset(&pingaddr, 0, sizeof(struct sockaddr_in));

 	pingaddr.sin6_family = AF_INET6;
 	h = xgethostbyname2(host, AF_INET6);
 	memcpy(&pingaddr.sin6_addr, h->h_addr, sizeof(pingaddr.sin6_addr));

 	pkt = (struct icmp6_hdr *) packet;
 	memset(pkt, 0, sizeof(packet));
 	pkt->icmp6_type = ICMP6_ECHO_REQUEST;

 	sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
 	setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, (char *) &sockopt,
 			   sizeof(sockopt));

 	c = sendto(pingsock, packet, DEFDATALEN + sizeof (struct icmp6_hdr), 0,
 			   (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in6));

 	if (c < 0 || c != sizeof(packet)) {
 		if (ENABLE_FEATURE_CLEAN_UP) close(pingsock);
 		bb_perror_msg_and_die("sendto");
 	}

 	signal(SIGALRM, noresp);
 	alarm(5);					/* give the host 5000ms to respond */
 	/* listen for replies */
 	while (1) {
 		struct sockaddr_in6 from;
 		size_t fromlen = sizeof(from);

 		if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
 						  (struct sockaddr *) &from, &fromlen)) < 0) {
 			if (errno == EINTR)
 				continue;
 			bb_perror_msg("recvfrom");
 			continue;
 		}
 		if (c >= 8) {			/* icmp6_hdr */
 			pkt = (struct icmp6_hdr *) packet;
 			if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
 				break;
 		}
 	}
 	if (ENABLE_FEATURE_CLEAN_UP) close(pingsock);
 	printf("%s is alive!\n", h->h_name);
 	return;
 }

 int ping6_main(int argc, char **argv)
 {
 	argc--;
 	argv++;
 	if (argc < 1)
 		bb_show_usage();
 	ping(*argv);
 	return EXIT_SUCCESS;
 }

 #else /* ! CONFIG_FEATURE_FANCY_PING6 */
 /* full(er) version */
 static struct sockaddr_in6 pingaddr;
 static int pingsock = -1;
 static int datalen; /* intentionally uninitialized to work around gcc bug */
 static char* ifname;

 static long ntransmitted, nreceived, nrepeats, pingcount;
 static int myid, options;
 static unsigned long tmin = ULONG_MAX, tmax, tsum;
 static char rcvd_tbl[MAX_DUP_CHK / 8];

 static struct hostent *hostent;

 static void sendping(int);
 static void pingstats(int);
 static void unpack(char *, int, struct sockaddr_in6 *, int);

 /**************************************************************************/

 static void pingstats(int junk)
 {
 	int status;

 	signal(SIGINT, SIG_IGN);

 	printf("\n--- %s ping statistics ---\n", hostent->h_name);
 	printf("%ld packets transmitted, ", ntransmitted);
 	printf("%ld packets received, ", nreceived);
 	if (nrepeats)
 		printf("%ld duplicates, ", nrepeats);
 	if (ntransmitted)
 		printf("%ld%% packet loss\n",
 			   (ntransmitted - nreceived) * 100 / ntransmitted);
 	if (nreceived)
 		printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
 			   tmin / 10, tmin % 10,
 			   (tsum / (nreceived + nrepeats)) / 10,
 			   (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
 	if (nreceived != 0)
 		status = EXIT_SUCCESS;
 	else
 		status = EXIT_FAILURE;
 	exit(status);
 }

 static void sendping(int junk)
 {
 	struct icmp6_hdr *pkt;
 	int i;
 	char packet[datalen + sizeof (struct icmp6_hdr)];

 	pkt = (struct icmp6_hdr *) packet;

 	pkt->icmp6_type = ICMP6_ECHO_REQUEST;
 	pkt->icmp6_code = 0;
 	pkt->icmp6_cksum = 0;
 	pkt->icmp6_seq = SWAP_BE16(ntransmitted++);
 	pkt->icmp6_id = myid;
 	CLR(pkt->icmp6_seq % MAX_DUP_CHK);

 	gettimeofday((struct timeval *) &pkt->icmp6_data8[4], NULL);

 	i = sendto(pingsock, packet, sizeof(packet), 0,
 			   (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in6));

 	if (i < 0)
 		bb_perror_msg_and_die("sendto");
 	else if ((size_t)i != sizeof(packet))
 		bb_error_msg_and_die("ping wrote %d chars; %d expected", i,
 			   (int)sizeof(packet));

 	signal(SIGALRM, sendping);
 	if (pingcount == 0 || ntransmitted < pingcount) {	/* schedule next in 1s */
 		alarm(PINGINTERVAL);
 	} else {					/* done, wait for the last ping to come back */
 		/* todo, don't necessarily need to wait so long... */
 		signal(SIGALRM, pingstats);
 		alarm(MAXWAIT);
 	}
 }

 /* RFC3542 changed some definitions from RFC2292 for no good reason, whee !
  * the newer 3542 uses a MLD_ prefix where as 2292 uses ICMP6_ prefix */
 #ifndef MLD_LISTENER_QUERY
 # define MLD_LISTENER_QUERY ICMP6_MEMBERSHIP_QUERY
 #endif
 #ifndef MLD_LISTENER_REPORT
 # define MLD_LISTENER_REPORT ICMP6_MEMBERSHIP_REPORT
 #endif
 #ifndef MLD_LISTENER_REDUCTION
 # define MLD_LISTENER_REDUCTION ICMP6_MEMBERSHIP_REDUCTION
 #endif
 static char *icmp6_type_name (int id)
 {
 	switch (id) {
 	case ICMP6_DST_UNREACH:				return "Destination Unreachable";
 	case ICMP6_PACKET_TOO_BIG:			return "Packet too big";
 	case ICMP6_TIME_EXCEEDED:			return "Time Exceeded";
 	case ICMP6_PARAM_PROB:				return "Parameter Problem";
 	case ICMP6_ECHO_REPLY:				return "Echo Reply";
 	case ICMP6_ECHO_REQUEST:			return "Echo Request";
 	case MLD_LISTENER_QUERY:			return "Listener Query";
 	case MLD_LISTENER_REPORT:			return "Listener Report";
 	case MLD_LISTENER_REDUCTION:		return "Listener Reduction";
 	default:							return "unknown ICMP type";
 	}
 }

 static void unpack(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit)
 {
 	struct icmp6_hdr *icmppkt;
 	struct timeval tv, *tp;
 	int dupflag;
 	unsigned long triptime;
 	char buf[INET6_ADDRSTRLEN];

 	gettimeofday(&tv, NULL);

 	/* discard if too short */
 	if (sz < (datalen + sizeof(struct icmp6_hdr)))
 		return;

 	icmppkt = (struct icmp6_hdr *) packet;

 	if (icmppkt->icmp6_id != myid)
 		return;				/* not our ping */

 	if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) {
 		++nreceived;
 		tp = (struct timeval *) &icmppkt->icmp6_data8[4];

 		if ((tv.tv_usec -= tp->tv_usec) < 0) {
 			--tv.tv_sec;
 			tv.tv_usec += 1000000;
 		}
 		tv.tv_sec -= tp->tv_sec;

 		triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
 		tsum += triptime;
 		if (triptime < tmin)
 			tmin = triptime;
 		if (triptime > tmax)
 			tmax = triptime;

 		if (TST(icmppkt->icmp6_seq % MAX_DUP_CHK)) {
 			++nrepeats;
 			--nreceived;
 			dupflag = 1;
 		} else {
 			SET(icmppkt->icmp6_seq % MAX_DUP_CHK);
 			dupflag = 0;
 		}

 		if (options & O_QUIET)
 			return;

 		printf("%d bytes from %s: icmp6_seq=%u", sz,
 			   inet_ntop(AF_INET6, &pingaddr.sin6_addr,
 						 buf, sizeof(buf)),
 			   icmppkt->icmp6_seq);
 		printf(" ttl=%d time=%lu.%lu ms", hoplimit,
 			   triptime / 10, triptime % 10);
 		if (dupflag)
 			printf(" (DUP!)");
 		printf("\n");
 	} else
 		if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST)
 			bb_error_msg("Warning: Got ICMP %d (%s)",
 					icmppkt->icmp6_type, icmp6_type_name (icmppkt->icmp6_type));
 }

 static void ping(const char *host)
 {
 	char packet[datalen + MAXIPLEN + MAXICMPLEN];
 	char buf[INET6_ADDRSTRLEN];
 	int sockopt;
 	struct msghdr msg;
 	struct sockaddr_in6 from;
 	struct iovec iov;
 	char control_buf[CMSG_SPACE(36)];

 	pingsock = create_icmp6_socket();

 	memset(&pingaddr, 0, sizeof(struct sockaddr_in));

 	pingaddr.sin6_family = AF_INET6;
 	hostent = xgethostbyname2(host, AF_INET6);
 	if (hostent->h_addrtype != AF_INET6)
 		bb_error_msg_and_die("unknown address type; only AF_INET6 is currently supported.");

 	memcpy(&pingaddr.sin6_addr, hostent->h_addr, sizeof(pingaddr.sin6_addr));

 #ifdef ICMP6_FILTER
 	{
 		struct icmp6_filter filt;
 		if (!(options & O_VERBOSE)) {
 			ICMP6_FILTER_SETBLOCKALL(&filt);
 			ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
 		} else {
 			ICMP6_FILTER_SETPASSALL(&filt);
 		}
 		if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
 					   sizeof(filt)) < 0)
 			bb_error_msg_and_die("setsockopt(ICMP6_FILTER)");
 	}
 #endif /*ICMP6_FILTER*/

 	/* enable broadcast pings */
 	sockopt = 1;
 	setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *) &sockopt,
 			   sizeof(sockopt));

 	/* set recv buf for broadcast pings */
 	sockopt = 48 * 1024;
 	setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *) &sockopt,
 			   sizeof(sockopt));

 	sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
 	setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, (char *) &sockopt,
 			   sizeof(sockopt));

 	sockopt = 1;
 	setsockopt(pingsock, SOL_IPV6, IPV6_HOPLIMIT, (char *) &sockopt,
 			   sizeof(sockopt));

 	if (ifname) {
 		if ((pingaddr.sin6_scope_id = if_nametoindex(ifname)) == 0)
 			bb_error_msg_and_die("%s: invalid interface name", ifname);
 	}

 	printf("PING %s (%s): %d data bytes\n",
 	           hostent->h_name,
 		   inet_ntop(AF_INET6, &pingaddr.sin6_addr,
 			buf, sizeof(buf)),
 		   datalen);

 	signal(SIGINT, pingstats);

 	/* start the ping's going ... */
 	sendping(0);

 	/* listen for replies */
 	msg.msg_name = &from;
 	msg.msg_namelen = sizeof(from);
 	msg.msg_iov = &iov;
 	msg.msg_iovlen = 1;
 	msg.msg_control = control_buf;
 	iov.iov_base = packet;
 	iov.iov_len = sizeof(packet);
 	while (1) {
 		int c;
 		struct cmsghdr *cmsgptr = NULL;
 		int hoplimit = -1;
 		msg.msg_controllen = sizeof(control_buf);

 		if ((c = recvmsg(pingsock, &msg, 0)) < 0) {
 			if (errno == EINTR)
 				continue;
 			bb_perror_msg("recvfrom");
 			continue;
 		}
 		for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL;
 			 cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
 			if (cmsgptr->cmsg_level == SOL_IPV6 &&
 				cmsgptr->cmsg_type == IPV6_HOPLIMIT ) {
 				hoplimit = *(int*)CMSG_DATA(cmsgptr);
 			}
 		}
 		unpack(packet, c, &from, hoplimit);
 		if (pingcount > 0 && nreceived >= pingcount)
 			break;
 	}
 	pingstats(0);
 }

 int ping6_main(int argc, char **argv)
 {
 	char *thisarg;

 	datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */

 	argc--;
 	argv++;
 	options = 0;
 	/* Parse any options */
 	while (argc >= 1 && **argv == '-') {
 		thisarg = *argv;
 		thisarg++;
 		switch (*thisarg) {
 		case 'v':
 			options &= ~O_QUIET;
 			options |= O_VERBOSE;
 			break;
 		case 'q':
 			options &= ~O_VERBOSE;
 			options |= O_QUIET;
 			break;
 		case 'c':
 			if (--argc <= 0)
 				bb_show_usage();
 			argv++;
 			pingcount = atoi(*argv);
 			break;
 		case 's':
 			if (--argc <= 0)
 				bb_show_usage();
 			argv++;
 			datalen = atoi(*argv);
 			break;
 		case 'I':
 			if (--argc <= 0)
 				bb_show_usage();
 			argv++;
 			ifname = *argv;
 			break;
 		default:
 			bb_show_usage();
 		}
 		argc--;
 		argv++;
 	}
 	if (argc < 1)
 		bb_show_usage();

 	myid = getpid() & 0xFFFF;
 	ping(*argv);
 	return EXIT_SUCCESS;
 }
 #endif /* ! CONFIG_FEATURE_FANCY_PING6 */

 /*
  * Copyright (c) 1989 The Regents of the University of California.
  * All rights reserved.
  *
  * This code is derived from software contributed to Berkeley by
  * Mike Muuss.
  *
  * 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. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
  *		ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
  *
  * 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.
  */
	/* vi: set sw=4 ts=4: */
	/*
	* $Id: ping6.c,v 1.6 2004/03/15 08:28:48 andersen Exp $
	* Mini ping implementation for busybox
	*
	* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
	*
	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
	*
	* This version of ping is adapted from the ping in netkit-base 0.10,
	* which is:
	*
	* Copyright (c) 1989 The Regents of the University of California.
	* All rights reserved.
	*
	* This code is derived from software contributed to Berkeley by
	* Mike Muuss.
	*
	* Original copyright notice is retained at the end of this file.
	*
	* This version is an adaptation of ping.c from busybox.
	* The code was modified by Bart Visscher <magick@linux-fan.com>
	*/

	#include <sys/param.h>
	#include <sys/socket.h>
	#include <sys/file.h>
	#include <sys/times.h>
	#include <signal.h>

	#include <netinet/in.h>
	#include <netinet/ip6.h>
	#include <netinet/icmp6.h>
	#include <arpa/inet.h>
	#include <net/if.h>
	#include <netdb.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <errno.h>
	#include <unistd.h>
	#include <string.h>
	#include <stdlib.h>
	#include <stddef.h> /* offsetof */
	#include "busybox.h"

	enum {
	DEFDATALEN = 56,
	MAXIPLEN = 60,
	MAXICMPLEN = 76,
	MAXPACKET = 65468,
	MAX_DUP_CHK = (8 * 128),
	MAXWAIT = 10,
	PINGINTERVAL = 1 /* second */
	};

	#define O_QUIET (1 << 0)
	#define O_VERBOSE (1 << 1)

	#define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */
	#define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */
	#define SET(bit) (A(bit) \|= B(bit))
	#define CLR(bit) (A(bit) &= (~B(bit)))
	#define TST(bit) (A(bit) & B(bit))

	static void ping(const char *host);

	/* simple version */
	#ifndef CONFIG_FEATURE_FANCY_PING6
	static struct hostent *h;

	static void noresp(int ign)
	{
	printf("No response from %s\n", h->h_name);
	exit(EXIT_FAILURE);
	}

	static void ping(const char *host)
	{
	struct sockaddr_in6 pingaddr;
	struct icmp6_hdr *pkt;
	int pingsock, c;
	int sockopt;
	char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];

	pingsock = create_icmp6_socket();

	memset(&pingaddr, 0, sizeof(struct sockaddr_in));

	pingaddr.sin6_family = AF_INET6;
	h = xgethostbyname2(host, AF_INET6);
	memcpy(&pingaddr.sin6_addr, h->h_addr, sizeof(pingaddr.sin6_addr));

	pkt = (struct icmp6_hdr *) packet;
	memset(pkt, 0, sizeof(packet));
	pkt->icmp6_type = ICMP6_ECHO_REQUEST;

	sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
	setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, (char *) &sockopt,
	sizeof(sockopt));

	c = sendto(pingsock, packet, DEFDATALEN + sizeof (struct icmp6_hdr), 0,
	(struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in6));

	if (c < 0 \|\| c != sizeof(packet)) {
	if (ENABLE_FEATURE_CLEAN_UP) close(pingsock);
	bb_perror_msg_and_die("sendto");
	}

	signal(SIGALRM, noresp);
	alarm(5); /* give the host 5000ms to respond */
	/* listen for replies */
	while (1) {
	struct sockaddr_in6 from;
	size_t fromlen = sizeof(from);

	if ((c = recvfrom(pingsock, packet, sizeof(packet), 0,
	(struct sockaddr *) &from, &fromlen)) < 0) {
	if (errno == EINTR)
	continue;
	bb_perror_msg("recvfrom");
	continue;
	}
	if (c >= 8) { /* icmp6_hdr */
	pkt = (struct icmp6_hdr *) packet;
	if (pkt->icmp6_type == ICMP6_ECHO_REPLY)
	break;
	}
	}
	if (ENABLE_FEATURE_CLEAN_UP) close(pingsock);
	printf("%s is alive!\n", h->h_name);
	return;
	}

	int ping6_main(int argc, char **argv)
	{
	argc--;
	argv++;
	if (argc < 1)
	bb_show_usage();
	ping(*argv);
	return EXIT_SUCCESS;
	}

	#else /* ! CONFIG_FEATURE_FANCY_PING6 */
	/* full(er) version */
	static struct sockaddr_in6 pingaddr;
	static int pingsock = -1;
	static int datalen; /* intentionally uninitialized to work around gcc bug */
	static char* ifname;

	static long ntransmitted, nreceived, nrepeats, pingcount;
	static int myid, options;
	static unsigned long tmin = ULONG_MAX, tmax, tsum;
	static char rcvd_tbl[MAX_DUP_CHK / 8];

	static struct hostent *hostent;

	static void sendping(int);
	static void pingstats(int);
	static void unpack(char , int, struct sockaddr_in6 , int);

	/**************************************************************************/

	static void pingstats(int junk)
	{
	int status;

	signal(SIGINT, SIG_IGN);

	printf("\n--- %s ping statistics ---\n", hostent->h_name);
	printf("%ld packets transmitted, ", ntransmitted);
	printf("%ld packets received, ", nreceived);
	if (nrepeats)
	printf("%ld duplicates, ", nrepeats);
	if (ntransmitted)
	printf("%ld%% packet loss\n",
	(ntransmitted - nreceived) * 100 / ntransmitted);
	if (nreceived)
	printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n",
	tmin / 10, tmin % 10,
	(tsum / (nreceived + nrepeats)) / 10,
	(tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
	if (nreceived != 0)
	status = EXIT_SUCCESS;
	else
	status = EXIT_FAILURE;
	exit(status);
	}

	static void sendping(int junk)
	{
	struct icmp6_hdr *pkt;
	int i;
	char packet[datalen + sizeof (struct icmp6_hdr)];

	pkt = (struct icmp6_hdr *) packet;

	pkt->icmp6_type = ICMP6_ECHO_REQUEST;
	pkt->icmp6_code = 0;
	pkt->icmp6_cksum = 0;
	pkt->icmp6_seq = SWAP_BE16(ntransmitted++);
	pkt->icmp6_id = myid;
	CLR(pkt->icmp6_seq % MAX_DUP_CHK);

	gettimeofday((struct timeval *) &pkt->icmp6_data8[4], NULL);

	i = sendto(pingsock, packet, sizeof(packet), 0,
	(struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in6));

	if (i < 0)
	bb_perror_msg_and_die("sendto");
	else if ((size_t)i != sizeof(packet))
	bb_error_msg_and_die("ping wrote %d chars; %d expected", i,
	(int)sizeof(packet));

	signal(SIGALRM, sendping);
	if (pingcount == 0 \|\| ntransmitted < pingcount) { /* schedule next in 1s */
	alarm(PINGINTERVAL);
	} else { /* done, wait for the last ping to come back */
	/* todo, don't necessarily need to wait so long... */
	signal(SIGALRM, pingstats);
	alarm(MAXWAIT);
	}
	}

	/* RFC3542 changed some definitions from RFC2292 for no good reason, whee !
	* the newer 3542 uses a MLD_ prefix where as 2292 uses ICMP6_ prefix */
	#ifndef MLD_LISTENER_QUERY
	# define MLD_LISTENER_QUERY ICMP6_MEMBERSHIP_QUERY
	#endif
	#ifndef MLD_LISTENER_REPORT
	# define MLD_LISTENER_REPORT ICMP6_MEMBERSHIP_REPORT
	#endif
	#ifndef MLD_LISTENER_REDUCTION
	# define MLD_LISTENER_REDUCTION ICMP6_MEMBERSHIP_REDUCTION
	#endif
	static char *icmp6_type_name (int id)
	{
	switch (id) {
	case ICMP6_DST_UNREACH: return "Destination Unreachable";
	case ICMP6_PACKET_TOO_BIG: return "Packet too big";
	case ICMP6_TIME_EXCEEDED: return "Time Exceeded";
	case ICMP6_PARAM_PROB: return "Parameter Problem";
	case ICMP6_ECHO_REPLY: return "Echo Reply";
	case ICMP6_ECHO_REQUEST: return "Echo Request";
	case MLD_LISTENER_QUERY: return "Listener Query";
	case MLD_LISTENER_REPORT: return "Listener Report";
	case MLD_LISTENER_REDUCTION: return "Listener Reduction";
	default: return "unknown ICMP type";
	}
	}

	static void unpack(char packet, int sz, struct sockaddr_in6 from, int hoplimit)
	{
	struct icmp6_hdr *icmppkt;
	struct timeval tv, *tp;
	int dupflag;
	unsigned long triptime;
	char buf[INET6_ADDRSTRLEN];

	gettimeofday(&tv, NULL);

	/* discard if too short */
	if (sz < (datalen + sizeof(struct icmp6_hdr)))
	return;

	icmppkt = (struct icmp6_hdr *) packet;

	if (icmppkt->icmp6_id != myid)
	return; /* not our ping */

	if (icmppkt->icmp6_type == ICMP6_ECHO_REPLY) {
	++nreceived;
	tp = (struct timeval *) &icmppkt->icmp6_data8[4];

	if ((tv.tv_usec -= tp->tv_usec) < 0) {
	--tv.tv_sec;
	tv.tv_usec += 1000000;
	}
	tv.tv_sec -= tp->tv_sec;

	triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100);
	tsum += triptime;
	if (triptime < tmin)
	tmin = triptime;
	if (triptime > tmax)
	tmax = triptime;

	if (TST(icmppkt->icmp6_seq % MAX_DUP_CHK)) {
	++nrepeats;
	--nreceived;
	dupflag = 1;
	} else {
	SET(icmppkt->icmp6_seq % MAX_DUP_CHK);
	dupflag = 0;
	}

	if (options & O_QUIET)
	return;

	printf("%d bytes from %s: icmp6_seq=%u", sz,
	inet_ntop(AF_INET6, &pingaddr.sin6_addr,
	buf, sizeof(buf)),
	icmppkt->icmp6_seq);
	printf(" ttl=%d time=%lu.%lu ms", hoplimit,
	triptime / 10, triptime % 10);
	if (dupflag)
	printf(" (DUP!)");
	printf("\n");
	} else
	if (icmppkt->icmp6_type != ICMP6_ECHO_REQUEST)
	bb_error_msg("Warning: Got ICMP %d (%s)",
	icmppkt->icmp6_type, icmp6_type_name (icmppkt->icmp6_type));
	}

	static void ping(const char *host)
	{
	char packet[datalen + MAXIPLEN + MAXICMPLEN];
	char buf[INET6_ADDRSTRLEN];
	int sockopt;
	struct msghdr msg;
	struct sockaddr_in6 from;
	struct iovec iov;
	char control_buf[CMSG_SPACE(36)];

	pingsock = create_icmp6_socket();

	memset(&pingaddr, 0, sizeof(struct sockaddr_in));

	pingaddr.sin6_family = AF_INET6;
	hostent = xgethostbyname2(host, AF_INET6);
	if (hostent->h_addrtype != AF_INET6)
	bb_error_msg_and_die("unknown address type; only AF_INET6 is currently supported.");

	memcpy(&pingaddr.sin6_addr, hostent->h_addr, sizeof(pingaddr.sin6_addr));

	#ifdef ICMP6_FILTER
	{
	struct icmp6_filter filt;
	if (!(options & O_VERBOSE)) {
	ICMP6_FILTER_SETBLOCKALL(&filt);
	ICMP6_FILTER_SETPASS(ICMP6_ECHO_REPLY, &filt);
	} else {
	ICMP6_FILTER_SETPASSALL(&filt);
	}
	if (setsockopt(pingsock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
	sizeof(filt)) < 0)
	bb_error_msg_and_die("setsockopt(ICMP6_FILTER)");
	}
	#endif /ICMP6_FILTER/

	/* enable broadcast pings */
	sockopt = 1;
	setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *) &sockopt,
	sizeof(sockopt));

	/* set recv buf for broadcast pings */
	sockopt = 48 * 1024;
	setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *) &sockopt,
	sizeof(sockopt));

	sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
	setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, (char *) &sockopt,
	sizeof(sockopt));

	sockopt = 1;
	setsockopt(pingsock, SOL_IPV6, IPV6_HOPLIMIT, (char *) &sockopt,
	sizeof(sockopt));

	if (ifname) {
	if ((pingaddr.sin6_scope_id = if_nametoindex(ifname)) == 0)
	bb_error_msg_and_die("%s: invalid interface name", ifname);
	}

	printf("PING %s (%s): %d data bytes\n",
	hostent->h_name,
	inet_ntop(AF_INET6, &pingaddr.sin6_addr,
	buf, sizeof(buf)),
	datalen);

	signal(SIGINT, pingstats);

	/* start the ping's going ... */
	sendping(0);

	/* listen for replies */
	msg.msg_name = &from;
	msg.msg_namelen = sizeof(from);
	msg.msg_iov = &iov;
	msg.msg_iovlen = 1;
	msg.msg_control = control_buf;
	iov.iov_base = packet;
	iov.iov_len = sizeof(packet);
	while (1) {
	int c;
	struct cmsghdr *cmsgptr = NULL;
	int hoplimit = -1;
	msg.msg_controllen = sizeof(control_buf);

	if ((c = recvmsg(pingsock, &msg, 0)) < 0) {
	if (errno == EINTR)
	continue;
	bb_perror_msg("recvfrom");
	continue;
	}
	for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL;
	cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
	if (cmsgptr->cmsg_level == SOL_IPV6 &&
	cmsgptr->cmsg_type == IPV6_HOPLIMIT ) {
	hoplimit = (int)CMSG_DATA(cmsgptr);
	}
	}
	unpack(packet, c, &from, hoplimit);
	if (pingcount > 0 && nreceived >= pingcount)
	break;
	}
	pingstats(0);
	}

	int ping6_main(int argc, char **argv)
	{
	char *thisarg;

	datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */

	argc--;
	argv++;
	options = 0;
	/* Parse any options */
	while (argc >= 1 && **argv == '-') {
	thisarg = *argv;
	thisarg++;
	switch (*thisarg) {
	case 'v':
	options &= ~O_QUIET;
	options \|= O_VERBOSE;
	break;
	case 'q':
	options &= ~O_VERBOSE;
	options \|= O_QUIET;
	break;
	case 'c':
	if (--argc <= 0)
	bb_show_usage();
	argv++;
	pingcount = atoi(*argv);
	break;
	case 's':
	if (--argc <= 0)
	bb_show_usage();
	argv++;
	datalen = atoi(*argv);
	break;
	case 'I':
	if (--argc <= 0)
	bb_show_usage();
	argv++;
	ifname = *argv;
	break;
	default:
	bb_show_usage();
	}
	argc--;
	argv++;
	}
	if (argc < 1)
	bb_show_usage();

	myid = getpid() & 0xFFFF;
	ping(*argv);
	return EXIT_SUCCESS;
	}
	#endif /* ! CONFIG_FEATURE_FANCY_PING6 */

	/*
	* Copyright (c) 1989 The Regents of the University of California.
	* All rights reserved.
	*
	* This code is derived from software contributed to Berkeley by
	* Mike Muuss.
	*
	* 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. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
	* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
	*
	* 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.
	*/