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busybox/networking/ping6.c
Denis Vlasenko 919c10dd88 ping[6]: don't do htons(a++), it can be a macro
2007-01-03 22:14:18 +00:00

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/* 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 */
};
static void ping(const char *host);
#ifndef CONFIG_FEATURE_FANCY_PING6
/* simple version */
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;
socklen_t fromlen = sizeof(from);
c = recvfrom(pingsock, packet, sizeof(packet), 0,
(struct sockaddr *) &from, &fromlen);
if (c < 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 */
#define OPT_STRING "qvc:s:I:"
enum {
OPT_QUIET = 1 << 0,
OPT_VERBOSE = 1 << 1,
};
static struct sockaddr_in6 pingaddr;
static int pingsock = -1;
static unsigned datalen; /* intentionally uninitialized to work around gcc bug */
static int if_index;
static unsigned long ntransmitted, nreceived, nrepeats, pingcount;
static int myid;
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);
#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 pingstats(int junk)
{
int status;
signal(SIGINT, SIG_IGN);
printf("\n--- %s ping statistics ---\n", hostent->h_name);
printf("%lu packets transmitted, ", ntransmitted);
printf("%lu packets received, ", nreceived);
if (nrepeats)
printf("%lu duplicates, ", nrepeats);
if (ntransmitted)
printf("%lu%% 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 = htons(ntransmitted); /* don't ++ here, it can be a macro */
pkt->icmp6_id = myid;
CLR(pkt->icmp6_seq % MAX_DUP_CHK);
ntransmitted++;
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 (option_mask32 & OPT_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!)");
puts("");
} 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 (!(option_mask32 & OPT_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 */
setsockopt_broadcast(pingsock);
/* 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 (if_index)
pingaddr.sin6_scope_id = if_index;
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 *opt_c, *opt_s, *opt_I;
datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */
/* exactly one argument needed, -v and -q don't mix */
opt_complementary = "=1:q--v:v--q";
getopt32(argc, argv, OPT_STRING, &opt_c, &opt_s, &opt_I);
if (option_mask32 & 4) pingcount = xatoul(opt_c); // -c
if (option_mask32 & 8) datalen = xatou16(opt_s); // -s
if (option_mask32 & 0x10) { // -I
if_index = if_nametoindex(opt_I);
if (!if_index)
bb_error_msg_and_die(
"%s: invalid interface name", opt_I);
}
myid = (int16_t)getpid();
ping(argv[optind]);
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.
*/
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