busybox/networking/ping.c

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/* vi: set sw=4 ts=4: */
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/*
* Mini ping implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
*
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* Adapted from the ping in netkit-base 0.10:
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* 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.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
/* from ping6.c:
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
*
* This version of ping is adapted from the ping in netkit-base 0.10,
* which is:
*
* 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>
*/
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#include <net/if.h>
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#include <netinet/ip_icmp.h>
#include "libbb.h"
#if ENABLE_PING6
#include <netinet/icmp6.h>
/* I see RENUMBERED constants in bits/in.h - !!?
* What a fuck is going on with libc? Is it a glibc joke? */
#ifdef IPV6_2292HOPLIMIT
#undef IPV6_HOPLIMIT
#define IPV6_HOPLIMIT IPV6_2292HOPLIMIT
#endif
#endif
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enum {
DEFDATALEN = 56,
MAXIPLEN = 60,
MAXICMPLEN = 76,
MAXPACKET = 65468,
MAX_DUP_CHK = (8 * 128),
MAXWAIT = 10,
PINGINTERVAL = 1, /* 1 second */
};
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/* common routines */
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static int in_cksum(unsigned short *buf, int sz)
{
int nleft = sz;
int sum = 0;
unsigned short *w = buf;
unsigned short ans = 0;
while (nleft > 1) {
sum += *w++;
nleft -= 2;
}
if (nleft == 1) {
*(unsigned char *) (&ans) = *(unsigned char *) w;
sum += ans;
}
sum = (sum >> 16) + (sum & 0xFFFF);
sum += (sum >> 16);
ans = ~sum;
return ans;
}
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#if !ENABLE_FEATURE_FANCY_PING
/* simple version */
static char *hostname;
static void noresp(int ign ATTRIBUTE_UNUSED)
{
printf("No response from %s\n", hostname);
exit(EXIT_FAILURE);
}
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static void ping4(len_and_sockaddr *lsa)
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{
struct sockaddr_in pingaddr;
struct icmp *pkt;
int pingsock, c;
char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
pingsock = create_icmp_socket();
pingaddr = lsa->sin;
pkt = (struct icmp *) packet;
memset(pkt, 0, sizeof(packet));
pkt->icmp_type = ICMP_ECHO;
pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
c = xsendto(pingsock, packet, DEFDATALEN + ICMP_MINLEN,
(struct sockaddr *) &pingaddr, sizeof(pingaddr));
/* listen for replies */
while (1) {
struct sockaddr_in from;
socklen_t fromlen = sizeof(from);
c = recvfrom(pingsock, packet, sizeof(packet), 0,
(struct sockaddr *) &from, &fromlen);
if (c < 0) {
if (errno != EINTR)
bb_perror_msg("recvfrom");
continue;
}
if (c >= 76) { /* ip + icmp */
struct iphdr *iphdr = (struct iphdr *) packet;
pkt = (struct icmp *) (packet + (iphdr->ihl << 2)); /* skip ip hdr */
if (pkt->icmp_type == ICMP_ECHOREPLY)
break;
}
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}
if (ENABLE_FEATURE_CLEAN_UP)
close(pingsock);
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}
#if ENABLE_PING6
static void ping6(len_and_sockaddr *lsa)
{
struct sockaddr_in6 pingaddr;
struct icmp6_hdr *pkt;
int pingsock, c;
int sockopt;
char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
pingsock = create_icmp6_socket();
pingaddr = lsa->sin6;
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, &sockopt, sizeof(sockopt));
c = xsendto(pingsock, packet, DEFDATALEN + sizeof (struct icmp6_hdr),
(struct sockaddr *) &pingaddr, sizeof(pingaddr));
/* 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)
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);
}
#endif
int ping_main(int argc, char **argv);
int ping_main(int argc, char **argv)
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{
len_and_sockaddr *lsa;
#if ENABLE_PING6
sa_family_t af = AF_UNSPEC;
while (++argv[0][0] == '-') {
if (argv[0][1] == '4') {
af = AF_INET;
continue;
}
if (argv[0][1] == '6') {
af = AF_INET6;
continue;
}
bb_show_usage();
}
#else
argv++;
#endif
hostname = *argv;
if (!hostname)
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bb_show_usage();
#if ENABLE_PING6
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lsa = xhost_and_af2sockaddr(hostname, 0, af);
#else
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lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
#endif
/* Set timer _after_ DNS resolution */
signal(SIGALRM, noresp);
alarm(5); /* give the host 5000ms to respond */
#if ENABLE_PING6
if (lsa->sa.sa_family == AF_INET6)
ping6(lsa);
else
#endif
ping4(lsa);
printf("%s is alive!\n", hostname);
return EXIT_SUCCESS;
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}
#else /* FEATURE_FANCY_PING */
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/* full(er) version */
#define OPT_STRING ("qvc:s:I:4" USE_PING6("6"))
enum {
OPT_QUIET = 1 << 0,
OPT_VERBOSE = 1 << 1,
OPT_c = 1 << 2,
OPT_s = 1 << 3,
OPT_I = 1 << 4,
OPT_IPV4 = 1 << 5,
OPT_IPV6 = (1 << 6) * ENABLE_PING6,
};
struct globals {
int pingsock;
len_and_sockaddr *source_lsa;
unsigned datalen;
int if_index;
unsigned long ntransmitted, nreceived, nrepeats, pingcount;
uint16_t myid;
unsigned tmin, tmax;
unsigned long tsum;
const char *hostname;
const char *dotted;
union {
struct sockaddr sa;
struct sockaddr_in sin;
#if ENABLE_PING6
struct sockaddr_in6 sin6;
#endif
} pingaddr;
char rcvd_tbl[MAX_DUP_CHK / 8];
};
#define G (*(struct globals*)&bb_common_bufsiz1)
#define pingsock (G.pingsock )
#define source_lsa (G.source_lsa )
#define datalen (G.datalen )
#define if_index (G.if_index )
#define ntransmitted (G.ntransmitted)
#define nreceived (G.nreceived )
#define nrepeats (G.nrepeats )
#define pingcount (G.pingcount )
#define myid (G.myid )
#define tmin (G.tmin )
#define tmax (G.tmax )
#define tsum (G.tsum )
#define hostname (G.hostname )
#define dotted (G.dotted )
#define pingaddr (G.pingaddr )
#define rcvd_tbl (G.rcvd_tbl )
void BUG_ping_globals_too_big(void);
#define INIT_G() do { \
if (sizeof(G) > COMMON_BUFSIZE) \
BUG_ping_globals_too_big(); \
pingsock = -1; \
tmin = UINT_MAX; \
} while (0)
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#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))
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/**************************************************************************/
static void pingstats(int junk ATTRIBUTE_UNUSED)
{
signal(SIGINT, SIG_IGN);
printf("\n--- %s ping statistics ---\n", hostname);
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printf("%lu packets transmitted, ", ntransmitted);
printf("%lu packets received, ", nreceived);
if (nrepeats)
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printf("%lu duplicates, ", nrepeats);
if (ntransmitted)
ntransmitted = (ntransmitted - nreceived) * 100 / ntransmitted;
printf("%lu%% packet loss\n", ntransmitted);
if (tmin != UINT_MAX)
printf("round-trip min/avg/max = %u.%u/%lu.%lu/%u.%u ms\n",
tmin / 10, tmin % 10,
(tsum / (nreceived + nrepeats)) / 10,
(tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10);
exit(nreceived == 0); /* (nreceived == 0) is true (1) -- 'failure' */
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}
static void sendping_tail(void (*sp)(int), const void *pkt, int size_pkt)
{
int sz;
CLR((uint16_t)ntransmitted % MAX_DUP_CHK);
ntransmitted++;
/* sizeof(pingaddr) can be larger than real sa size, but I think
* it doesn't matter */
sz = xsendto(pingsock, pkt, size_pkt, &pingaddr.sa, sizeof(pingaddr));
if (sz != size_pkt)
bb_error_msg_and_die(bb_msg_write_error);
signal(SIGALRM, sp);
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);
}
}
static void sendping4(int junk ATTRIBUTE_UNUSED)
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{
struct icmp *pkt = alloca(datalen + ICMP_MINLEN);
pkt->icmp_type = ICMP_ECHO;
pkt->icmp_code = 0;
pkt->icmp_cksum = 0;
pkt->icmp_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */
pkt->icmp_id = myid;
gettimeofday((struct timeval *) &pkt->icmp_dun, NULL);
pkt->icmp_cksum = in_cksum((unsigned short *) pkt, datalen + ICMP_MINLEN);
sendping_tail(sendping4, pkt, datalen + ICMP_MINLEN);
}
#if ENABLE_PING6
static void sendping6(int junk ATTRIBUTE_UNUSED)
{
struct icmp6_hdr *pkt = alloca(datalen + sizeof(struct icmp6_hdr));
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;
gettimeofday((struct timeval *) &pkt->icmp6_data8[4], NULL);
sendping_tail(sendping6, pkt, datalen + sizeof(struct icmp6_hdr));
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}
#endif
static const char *icmp_type_name(int id)
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{
switch (id) {
case ICMP_ECHOREPLY: return "Echo Reply";
case ICMP_DEST_UNREACH: return "Destination Unreachable";
case ICMP_SOURCE_QUENCH: return "Source Quench";
case ICMP_REDIRECT: return "Redirect (change route)";
case ICMP_ECHO: return "Echo Request";
case ICMP_TIME_EXCEEDED: return "Time Exceeded";
case ICMP_PARAMETERPROB: return "Parameter Problem";
case ICMP_TIMESTAMP: return "Timestamp Request";
case ICMP_TIMESTAMPREPLY: return "Timestamp Reply";
case ICMP_INFO_REQUEST: return "Information Request";
case ICMP_INFO_REPLY: return "Information Reply";
case ICMP_ADDRESS: return "Address Mask Request";
case ICMP_ADDRESSREPLY: return "Address Mask Reply";
default: return "unknown ICMP type";
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}
}
#if ENABLE_PING6
/* 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 const 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";
}
}
#endif
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static void unpack_tail(int sz, struct timeval *tp,
const char *from_str,
uint16_t recv_seq, int ttl)
{
const char *dupmsg = " (DUP!)";
unsigned triptime = triptime; /* for gcc */
++nreceived;
if (tp) {
struct timeval tv;
gettimeofday(&tv, NULL);
tv.tv_usec -= tp->tv_usec;
if (tv.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(recv_seq % MAX_DUP_CHK)) {
++nrepeats;
--nreceived;
} else {
SET(recv_seq % MAX_DUP_CHK);
dupmsg += 7;
}
if (option_mask32 & OPT_QUIET)
return;
printf("%d bytes from %s: seq=%u ttl=%d", sz,
from_str, recv_seq, ttl);
if (tp)
printf(" time=%u.%u ms", triptime / 10, triptime % 10);
puts(dupmsg);
fflush(stdout);
}
static void unpack4(char *buf, int sz, struct sockaddr_in *from)
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{
struct icmp *icmppkt;
struct iphdr *iphdr;
int hlen;
/* discard if too short */
if (sz < (datalen + ICMP_MINLEN))
return;
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/* check IP header */
iphdr = (struct iphdr *) buf;
hlen = iphdr->ihl << 2;
sz -= hlen;
icmppkt = (struct icmp *) (buf + hlen);
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if (icmppkt->icmp_id != myid)
return; /* not our ping */
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if (icmppkt->icmp_type == ICMP_ECHOREPLY) {
uint16_t recv_seq = ntohs(icmppkt->icmp_seq);
struct timeval *tp = NULL;
if (sz >= ICMP_MINLEN + sizeof(struct timeval))
tp = (struct timeval *) icmppkt->icmp_data;
unpack_tail(sz, tp,
inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr),
recv_seq, iphdr->ttl);
} else if (icmppkt->icmp_type != ICMP_ECHO) {
bb_error_msg("warning: got ICMP %d (%s)",
icmppkt->icmp_type,
icmp_type_name(icmppkt->icmp_type));
}
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}
#if ENABLE_PING6
static void unpack6(char *packet, int sz, struct sockaddr_in6 *from, int hoplimit)
{
struct icmp6_hdr *icmppkt;
char buf[INET6_ADDRSTRLEN];
/* 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) {
uint16_t recv_seq = ntohs(icmppkt->icmp6_seq);
struct timeval *tp = NULL;
if (sz >= sizeof(struct icmp6_hdr) + sizeof(struct timeval))
tp = (struct timeval *) &icmppkt->icmp6_data8[4];
unpack_tail(sz, tp,
inet_ntop(AF_INET6, &pingaddr.sin6.sin6_addr,
buf, sizeof(buf)),
recv_seq, hoplimit);
} 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));
}
}
#endif
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static void ping4(len_and_sockaddr *lsa)
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{
char packet[datalen + MAXIPLEN + MAXICMPLEN];
int sockopt;
pingsock = create_icmp_socket();
pingaddr.sin = lsa->sin;
if (source_lsa)
xbind(pingsock, &lsa->sa, lsa->len);
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/* enable broadcast pings */
setsockopt_broadcast(pingsock);
/* set recv buf for broadcast pings */
sockopt = 48 * 1024; /* explain why 48k? */
setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
signal(SIGINT, pingstats);
/* start the ping's going ... */
sendping4(0);
/* listen for replies */
while (1) {
struct sockaddr_in from;
socklen_t fromlen = (socklen_t) sizeof(from);
int c;
c = recvfrom(pingsock, packet, sizeof(packet), 0,
(struct sockaddr *) &from, &fromlen);
if (c < 0) {
if (errno != EINTR)
bb_perror_msg("recvfrom");
continue;
}
unpack4(packet, c, &from);
if (pingcount > 0 && nreceived >= pingcount)
break;
}
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}
#if ENABLE_PING6
extern int BUG_bad_offsetof_icmp6_cksum(void);
static void ping6(len_and_sockaddr *lsa)
{
char packet[datalen + MAXIPLEN + MAXICMPLEN];
int sockopt;
struct msghdr msg;
struct sockaddr_in6 from;
struct iovec iov;
char control_buf[CMSG_SPACE(36)];
pingsock = create_icmp6_socket();
pingaddr.sin6 = lsa->sin6;
/* untested whether "-I addr" really works for IPv6: */
if (source_lsa)
xbind(pingsock, &lsa->sa, lsa->len);
#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; /* explain why 48k? */
setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, &sockopt, sizeof(sockopt));
sockopt = offsetof(struct icmp6_hdr, icmp6_cksum);
if (offsetof(struct icmp6_hdr, icmp6_cksum) != 2)
BUG_bad_offsetof_icmp6_cksum();
setsockopt(pingsock, SOL_RAW, IPV6_CHECKSUM, &sockopt, sizeof(sockopt));
/* request ttl info to be returned in ancillary data */
setsockopt(pingsock, SOL_IPV6, IPV6_HOPLIMIT, &const_int_1, sizeof(const_int_1));
if (if_index)
pingaddr.sin6.sin6_scope_id = if_index;
signal(SIGINT, pingstats);
/* start the ping's going ... */
sendping6(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 *mp;
int hoplimit = -1;
msg.msg_controllen = sizeof(control_buf);
c = recvmsg(pingsock, &msg, 0);
if (c < 0) {
if (errno != EINTR)
bb_perror_msg("recvfrom");
continue;
}
for (mp = CMSG_FIRSTHDR(&msg); mp; mp = CMSG_NXTHDR(&msg, mp)) {
if (mp->cmsg_level == SOL_IPV6
&& mp->cmsg_type == IPV6_HOPLIMIT
/* don't check len - we trust the kernel: */
/* && mp->cmsg_len >= CMSG_LEN(sizeof(int)) */
) {
hoplimit = *(int*)CMSG_DATA(mp);
}
}
unpack6(packet, c, &from, hoplimit);
if (pingcount > 0 && nreceived >= pingcount)
break;
}
}
#endif
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static void ping(len_and_sockaddr *lsa)
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{
printf("PING %s (%s)", hostname, dotted);
if (source_lsa) {
printf(" from %s",
xmalloc_sockaddr2dotted_noport(&lsa->sa, lsa->len));
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}
printf(": %d data bytes\n", datalen);
#if ENABLE_PING6
if (lsa->sa.sa_family == AF_INET6)
ping6(lsa);
else
#endif
ping4(lsa);
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}
int ping_main(int argc, char **argv);
int ping_main(int argc, char **argv)
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{
len_and_sockaddr *lsa;
char *opt_c, *opt_s, *opt_I;
USE_PING6(sa_family_t af = AF_UNSPEC;)
INIT_G();
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 & OPT_c) pingcount = xatoul(opt_c); // -c
if (option_mask32 & OPT_s) datalen = xatou16(opt_s); // -s
if (option_mask32 & OPT_I) { // -I
if_index = if_nametoindex(opt_I);
if (!if_index) {
/* TODO: I'm not sure it takes IPv6 unless in [XX:XX..] format */
/* (ping doesn't support source IPv6 addresses yet anyway) */
source_lsa = xdotted2sockaddr(opt_I, 0);
}
}
myid = (uint16_t) getpid();
hostname = argv[optind];
#if ENABLE_PING6
if (option_mask32 & OPT_IPV4)
af = AF_INET;
if (option_mask32 & OPT_IPV6)
af = AF_INET6;
2007-02-04 08:09:08 +05:30
lsa = xhost_and_af2sockaddr(hostname, 0, af);
#else
2007-02-04 08:09:08 +05:30
lsa = xhost_and_af2sockaddr(hostname, 0, AF_INET);
#endif
if (source_lsa && source_lsa->sa.sa_family != lsa->sa.sa_family)
/* leaking it here... */
source_lsa = NULL;
dotted = xmalloc_sockaddr2dotted_noport(&lsa->sa, lsa->len);
ping(lsa);
pingstats(0);
return EXIT_SUCCESS;
1999-12-08 04:44:59 +05:30
}
#endif /* FEATURE_FANCY_PING */
#if ENABLE_PING6
int ping6_main(int argc, char **argv);
int ping6_main(int argc, char **argv)
{
argv[0] = (char*)"-6";
return ping_main(argc + 1, argv - 1);
}
#endif
/* from ping6.c:
* 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.
*/