概述
从Android源码中拷贝下来的，可以在Linux直接编译运行
ping.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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1989 The Regents of the University of California.n
All rights reserved.n";
#endif /* not lint */
/*
* P I N G . C
*
* Using the InterNet Control Message Protocol (ICMP) "ECHO" facility,
* measure round-trip-delays and packet loss across network paths.
*
* Author -
* Mike Muuss
* U. S. Army Ballistic Research Laboratory
* December, 1983
*
* Status -
* Public Domain. Distribution Unlimited.
* Bugs -
* More statistics could always be gathered.
* This program has to run SUID to ROOT to access the ICMP socket.
*/
#include "ping_common.h"
#include <netinet/ip.h>
#include <linux/icmp.h>
#include <sched.h>
#define bzero(b,sz) memset(b, 0, sz)
/* PING COMMON */
int options;
int sndbuf;
int ttl;
int rtt;
int rtt_addend;
__u16 acked;
int mx_dup_ck = MAX_DUP_CHK;
char rcvd_tbl[MAX_DUP_CHK / 8];
/* counters */
long npackets; /* max packets to transmit */
long nreceived; /* # of packets we got back */
long nrepeats; /* number of duplicates */
long ntransmitted; /* sequence # for outbound packets = #sent */
long nchecksum; /* replies with bad checksum */
long nerrors; /* icmp errors */
int interval = 1000; /* interval between packets (msec) */
int preload;
int deadline = 0; /* time to die */
int lingertime = MAXWAIT*1000;
struct timeval start_time, cur_time;
volatile int exiting;
volatile int status_snapshot;
int confirm = 0;
/* Stupid workarounds for bugs/missing functionality in older linuces.
* confirm_flag fixes refusing service of kernels without MSG_CONFIRM.
* i.e. for linux-2.2 */
int confirm_flag = MSG_CONFIRM;
/* And this is workaround for bug in IP_RECVERR on raw sockets which is present
* in linux-2.2.[0-19], linux-2.4.[0-7] */
int working_recverr;
/* timing */
int timing; /* flag to do timing */
long tmin = LONG_MAX; /* minimum round trip time */
long tmax; /* maximum round trip time */
/* Message for rpm maintainers: have _shame_. If you want
* to fix something send the patch to me for sanity checking.
* "sparcfix" patch is a complete non-sense, apparenly the person
* prepared it was stoned.
*/
long long tsum; /* sum of all times, for doing average */
long long tsum2;
int pipesize = -1;
int datalen = DEFDATALEN;
char *hostname;
int uid;
int ident; /* process id to identify our packets */
static int screen_width = INT_MAX;
/* Fills all the outpack, excluding ICMP header, but _including_
* timestamp area with supplied pattern.
*/
static void fill(char *patp)
{
int ii, jj, kk;
int pat[16];
char *cp;
char *bp = outpack+8;
for (cp = patp; *cp; cp++) {
if (!isxdigit(*cp)) {
fprintf(stderr,
"ping: patterns must be specified as hex digits.n");
exit(2);
}
}
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 + ii); kk += ii)
for (jj = 0; jj < ii; ++jj)
bp[jj + kk] = pat[jj];
}
if (!(options & F_QUIET)) {
printf("PATTERN: 0x");
for (jj = 0; jj < ii; ++jj)
printf("%02x", bp[jj] & 0xFF);
printf("n");
}
}
void common_options(int ch)
{
switch(ch) {
case 'a':
options |= F_AUDIBLE;
break;
case 'A':
options |= F_ADAPTIVE;
break;
case 'c':
npackets = atoi(optarg);
if (npackets <= 0) {
fprintf(stderr, "ping: bad number of packets to transmit.n");
exit(2);
}
break;
case 'd':
options |= F_SO_DEBUG;
break;
case 'f':
options |= F_FLOOD;
//setbuf(stdout, (char *)NULL);
break;
case 'i': /* wait between sending packets */
{
if (strchr(optarg, '.')) {
float t;
if (sscanf(optarg, "%f", &t) != 1) {
fprintf(stderr, "ping: bad timing interval.n");
exit(2);
}
interval = (int)(t*1000);
} else if (sscanf(optarg, "%d", &interval) == 1) {
interval *= 1000;
} else {
fprintf(stderr, "ping: bad timing interval.n");
exit(2);
}
if (interval < 0) {
fprintf(stderr, "ping: bad timing interval.n");
exit(2);
}
options |= F_INTERVAL;
break;
}
case 'w':
deadline = atoi(optarg);
if (deadline < 0) {
fprintf(stderr, "ping: bad wait time.n");
exit(2);
}
break;
case 'l':
preload = atoi(optarg);
if (preload <= 0) {
fprintf(stderr, "ping: bad preload value, should be 1..%dn", mx_dup_ck);
exit(2);
}
if (preload > mx_dup_ck)
preload = mx_dup_ck;
if (uid && preload > 3) {
fprintf(stderr, "ping: cannot set preload to value > 3n");
exit(2);
}
break;
case 'S':
sndbuf = atoi(optarg);
if (sndbuf <= 0) {
fprintf(stderr, "ping: bad sndbuf value.n");
exit(2);
}
break;
case 'n':
options |= F_NUMERIC;
break;
case 'p': /* fill buffer with user pattern */
options |= F_PINGFILLED;
fill(optarg);
break;
case 'q':
options |= F_QUIET;
break;
case 'r':
options |= F_SO_DONTROUTE;
break;
case 's': /* size of packet to send */
datalen = atoi(optarg);
if (datalen < 0) {
fprintf(stderr, "ping: illegal negative packet size %d.n", datalen);
exit(2);
}
break;
case 'v':
options |= F_VERBOSE;
break;
case 'L':
options |= F_NOLOOP;
break;
case 't':
options |= F_TTL;
ttl = atoi(optarg);
if (ttl < 0 || ttl > 255) {
fprintf(stderr, "ping: ttl %u out of rangen", ttl);
exit(2);
}
break;
case 'U':
options |= F_LATENCY;
break;
case 'B':
options |= F_STRICTSOURCE;
break;
case 'W':
lingertime = atoi(optarg);
if (lingertime < 0 || lingertime > INT_MAX/1000000) {
fprintf(stderr, "ping: bad linger time.n");
exit(2);
}
lingertime *= 1000;
break;
case 'V':
printf("ping utility, iputils-ssn");
exit(0);
default:
abort();
}
}
static void sigexit(int signo)
{
exiting = 1;
}
static void sigstatus(int signo)
{
status_snapshot = 1;
}
int __schedule_exit(int next)
{
static unsigned long waittime;
struct itimerval it;
if (waittime)
return next;
if (nreceived) {
waittime = 2 * tmax;
if (waittime < 1000*interval)
waittime = 1000*interval;
} else
waittime = lingertime*1000;
if (next < 0 || next < waittime/1000)
next = waittime/1000;
it.it_interval.tv_sec = 0;
it.it_interval.tv_usec = 0;
it.it_value.tv_sec = waittime/1000000;
it.it_value.tv_usec = waittime%1000000;
setitimer(ITIMER_REAL, &it, NULL);
return next;
}
static inline void update_interval(void)
{
int est = rtt ? rtt/8 : interval*1000;
interval = (est+rtt_addend+500)/1000;
if (uid && interval < MINUSERINTERVAL)
interval = MINUSERINTERVAL;
}
/*
* 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 VAX
* byte-order, to compute the round-trip time.
*/
int pinger(void)
{
static int oom_count;
static int tokens;
int i;
/* Have we already sent enough? If we have, return an arbitrary positive value. */
if (exiting || (npackets && ntransmitted >= npackets && !deadline))
return 1000;
/* Check that packets < rate*time + preload */
if (cur_time.tv_sec == 0) {
gettimeofday(&cur_time, NULL);
tokens = interval*(preload-1);
} else {
long ntokens;
struct timeval tv;
gettimeofday(&tv, NULL);
ntokens = (tv.tv_sec - cur_time.tv_sec)*1000 +
(tv.tv_usec-cur_time.tv_usec)/1000;
if (!interval) {
/* Case of unlimited flood is special;
* if we see no reply, they are limited to 100pps */
if (ntokens < MININTERVAL && in_flight() >= preload)
return MININTERVAL-ntokens;
}
ntokens += tokens;
if (ntokens > interval*preload)
ntokens = interval*preload;
if (ntokens < interval)
return interval - ntokens;
cur_time = tv;
tokens = ntokens - interval;
}
resend:
i = send_probe();
if (i == 0) {
oom_count = 0;
advance_ntransmitted();
if (!(options & F_QUIET) && (options & F_FLOOD)) {
/* Very silly, but without this output with
* high preload or pipe size is very confusing. */
if ((preload < screen_width && pipesize < screen_width) ||
in_flight() < screen_width)
write(STDOUT_FILENO, ".", 1);
}
return interval - tokens;
}
/* And handle various errors... */
if (i > 0) {
/* Apparently, it is some fatal bug. */
abort();
} else if (errno == ENOBUFS || errno == ENOMEM) {
int nores_interval;
/* Device queue overflow or OOM. Packet is not sent. */
tokens = 0;
/* Slowdown. This works only in adaptive mode (option -A) */
rtt_addend += (rtt < 8*50000 ? rtt/8 : 50000);
if (options&F_ADAPTIVE)
update_interval();
nores_interval = SCHINT(interval/2);
if (nores_interval > 500)
nores_interval = 500;
oom_count++;
if (oom_count*nores_interval < lingertime)
return nores_interval;
i = 0;
/* Fall to hard error. It is to avoid complete deadlock
* on stuck output device even when dealine was not requested.
* Expected timings are screwed up in any case, but we will
* exit some day. :-) */
} else if (errno == EAGAIN) {
/* Socket buffer is full. */
tokens += interval;
return MININTERVAL;
} else {
if ((i=receive_error_msg()) > 0) {
/* An ICMP error arrived. */
tokens += interval;
return MININTERVAL;
}
/* Compatibility with old linuces. */
if (i == 0 && confirm_flag && errno == EINVAL) {
confirm_flag = 0;
errno = 0;
}
if (!errno)
goto resend;
}
/* Hard local error. Pretend we sent packet. */
advance_ntransmitted();
if (i == 0 && !(options & F_QUIET)) {
if (options & F_FLOOD)
write(STDOUT_FILENO, "E", 1);
else
perror("ping: sendmsg");
}
tokens = 0;
return SCHINT(interval);
}
/* Set socket buffers, "alloc" is an estimate of memory taken by single packet. */
void sock_setbufs(int icmp_sock, int alloc)
{
int rcvbuf, hold;
int tmplen = sizeof(hold);
if (!sndbuf)
sndbuf = alloc;
setsockopt(icmp_sock, SOL_SOCKET, SO_SNDBUF, (char *)&sndbuf, sizeof(sndbuf));
rcvbuf = hold = alloc * preload;
if (hold < 65536)
hold = 65536;
setsockopt(icmp_sock, SOL_SOCKET, SO_RCVBUF, (char *)&hold, sizeof(hold));
if (getsockopt(icmp_sock, SOL_SOCKET, SO_RCVBUF, (char *)&hold, &tmplen) == 0) {
if (hold < rcvbuf)
fprintf(stderr, "WARNING: probably, rcvbuf is not enough to hold preload.n");
}
}
/* Protocol independent setup and parameter checks. */
void setup(int icmp_sock)
{
int hold;
struct timeval tv;
if ((options & F_FLOOD) && !(options & F_INTERVAL))
interval = 0;
if (uid && interval < MINUSERINTERVAL) {
fprintf(stderr, "ping: cannot flood; minimal interval, allowed for user, is %dmsn", MINUSERINTERVAL);
exit(2);
}
if (interval >= INT_MAX/preload) {
fprintf(stderr, "ping: illegal preload and/or intervaln");
exit(2);
}
hold = 1;
if (options & F_SO_DEBUG)
setsockopt(icmp_sock, SOL_SOCKET, SO_DEBUG, (char *)&hold, sizeof(hold));
if (options & F_SO_DONTROUTE)
setsockopt(icmp_sock, SOL_SOCKET, SO_DONTROUTE, (char *)&hold, sizeof(hold));
#ifdef SO_TIMESTAMP
if (!(options&F_LATENCY)) {
int on = 1;
if (setsockopt(icmp_sock, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on)))
fprintf(stderr, "Warning: no SO_TIMESTAMP support, falling back to SIOCGSTAMPn");
}
#endif
/* Set some SNDTIMEO to prevent blocking forever
* on sends, when device is too slow or stalls. Just put limit
* of one second, or "interval", if it is less.
*/
tv.tv_sec = 1;
tv.tv_usec = 0;
if (interval < 1000) {
tv.tv_sec = 0;
tv.tv_usec = 1000 * SCHINT(interval);
}
setsockopt(icmp_sock, SOL_SOCKET, SO_SNDTIMEO, (char*)&tv, sizeof(tv));
/* Set RCVTIMEO to "interval". Note, it is just an optimization
* allowing to avoid redundant poll(). */
tv.tv_sec = SCHINT(interval)/1000;
tv.tv_usec = 1000*(SCHINT(interval)%1000);
if (setsockopt(icmp_sock, SOL_SOCKET, SO_RCVTIMEO, (char*)&tv, sizeof(tv)))
options |= F_FLOOD_POLL;
if (!(options & F_PINGFILLED)) {
int i;
char *p = outpack+8;
/* Do not forget about case of small datalen,
* fill timestamp area too!
*/
for (i = 0; i < datalen; ++i)
*p++ = i;
}
ident = getpid() & 0xFFFF;
set_signal(SIGINT, sigexit);
set_signal(SIGALRM, sigexit);
set_signal(SIGQUIT, sigstatus);
gettimeofday(&start_time, NULL);
if (deadline) {
struct itimerval it;
it.it_interval.tv_sec = 0;
it.it_interval.tv_usec = 0;
it.it_value.tv_sec = deadline;
it.it_value.tv_usec = 0;
setitimer(ITIMER_REAL, &it, NULL);
}
#if 0
if (isatty(STDOUT_FILENO)) {
struct winsize w;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &w) != -1) {
if (w.ws_col > 0)
screen_width = w.ws_col;
}
}
#endif
}
void main_loop(int icmp_sock, __u8 *packet, int packlen)
{
char addrbuf[128];
char ans_data[4096];
struct iovec iov;
struct msghdr msg;
struct cmsghdr *c;
int cc;
int next;
int polling;
iov.iov_base = (char *)packet;
for (;;) {
/* Check exit conditions. */
if (exiting)
break;
if (npackets && nreceived + nerrors >= npackets)
break;
if (deadline && nerrors)
break;
/* Check for and do special actions. */
if (status_snapshot)
status();
/* Send probes scheduled to this time. */
do {
next = pinger();
next = schedule_exit(next);
} while (next <= 0);
/* "next" is time to send next probe, if positive.
* If next<=0 send now or as soon as possible. */
/* Technical part. Looks wicked. Could be dropped,
* if everyone used the newest kernel. :-)
* Its purpose is:
* 1. Provide intervals less than resolution of scheduler.
* Solution: spinning.
* 2. Avoid use of poll(), when recvmsg() can provide
* timed waiting (SO_RCVTIMEO). */
polling = 0;
if ((options & (F_ADAPTIVE|F_FLOOD_POLL)) || next<SCHINT(interval)) {
int recv_expected = in_flight();
/* If we are here, recvmsg() is unable to wait for
* required timeout. */
if (1000*next <= 1000000/(int)HZ) {
/* Very short timeout... So, if we wait for
* something, we sleep for MININTERVAL.
* Otherwise, spin! */
if (recv_expected) {
next = MININTERVAL;
} else {
next = 0;
/* When spinning, no reasons to poll.
* Use nonblocking recvmsg() instead. */
polling = MSG_DONTWAIT;
/* But yield yet. */
sched_yield();
}
}
if (!polling &&
((options & (F_ADAPTIVE|F_FLOOD_POLL)) || interval)) {
struct pollfd pset;
pset.fd = icmp_sock;
pset.events = POLLIN|POLLERR;
pset.revents = 0;
if (poll(&pset, 1, next) < 1 ||
!(pset.revents&(POLLIN|POLLERR)))
continue;
polling = MSG_DONTWAIT;
}
}
for (;;) {
struct timeval *recv_timep = NULL;
struct timeval recv_time;
int not_ours = 0; /* Raw socket can receive messages
* destined to other running pings. */
iov.iov_len = packlen;
msg.msg_name = addrbuf;
msg.msg_namelen = sizeof(addrbuf);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = ans_data;
msg.msg_controllen = sizeof(ans_data);
cc = recvmsg(icmp_sock, &msg, polling);
polling = MSG_DONTWAIT;
if (cc < 0) {
if (errno == EAGAIN || errno == EINTR)
break;
if (!receive_error_msg()) {
if (errno) {
perror("ping: recvmsg");
break;
}
not_ours = 1;
}
} else {
#ifdef SO_TIMESTAMP
for (c = CMSG_FIRSTHDR(&msg); c; c = CMSG_NXTHDR(&msg, c)) {
if (c->cmsg_level != SOL_SOCKET ||
c->cmsg_type != SO_TIMESTAMP)
continue;
if (c->cmsg_len < CMSG_LEN(sizeof(struct timeval)))
continue;
recv_timep = (struct timeval*)CMSG_DATA(c);
}
#endif
if ((options&F_LATENCY) || recv_timep == NULL) {
if ((options&F_LATENCY) ||
ioctl(icmp_sock, SIOCGSTAMP, &recv_time))
gettimeofday(&recv_time, NULL);
recv_timep = &recv_time;
}
not_ours = parse_reply(&msg, cc, addrbuf, recv_timep);
}
/* See? ... someone runs another ping on this host. */
if (not_ours)
install_filter();
/* If nothing is in flight, "break" returns us to pinger. */
if (in_flight() == 0)
break;
/* Otherwise, try to recvmsg() again. recvmsg()
* is nonblocking after the first iteration, so that
* if nothing is queued, it will receive EAGAIN
* and return to pinger. */
}
}
finish();
}
int gather_statistics(__u8 *ptr, int cc, __u16 seq, int hops,
int csfailed, struct timeval *tv, char *from)
{
int dupflag = 0;
long triptime = 0;
++nreceived;
if (!csfailed)
acknowledge(seq);
if (timing && cc >= 8+sizeof(struct timeval)) {
struct timeval tmp_tv;
memcpy(&tmp_tv, ptr, sizeof(tmp_tv));
restamp:
tvsub(tv, &tmp_tv);
triptime = tv->tv_sec * 1000000 + tv->tv_usec;
if (triptime < 0) {
fprintf(stderr, "Warning: time of day goes back (%ldus), taking countermeasures.n", triptime);
triptime = 0;
if (!(options & F_LATENCY)) {
gettimeofday(tv, NULL);
options |= F_LATENCY;
goto restamp;
}
}
if (!csfailed) {
tsum += triptime;
tsum2 += (long long)triptime * (long long)triptime;
if (triptime < tmin)
tmin = triptime;
if (triptime > tmax)
tmax = triptime;
if (!rtt)
rtt = triptime*8;
else
rtt += triptime-rtt/8;
if (options&F_ADAPTIVE)
update_interval();
}
}
if (csfailed) {
++nchecksum;
--nreceived;
} else if (TST(seq % mx_dup_ck)) {
++nrepeats;
--nreceived;
dupflag = 1;
} else {
SET(seq % mx_dup_ck);
dupflag = 0;
}
confirm = confirm_flag;
if (options & F_QUIET)
return 1;
if (options & F_FLOOD) {
if (!csfailed)
write(STDOUT_FILENO, "b b", 3);
else
write(STDOUT_FILENO, "bC", 1);
} else {
int i;
__u8 *cp, *dp;
printf("%d bytes from %s: icmp_seq=%u", cc, from, seq);
if (hops >= 0)
printf(" ttl=%d", hops);
if (cc < datalen+8) {
printf(" (truncated)n");
return 1;
}
if (timing) {
if (triptime >= 100000)
printf(" time=%ld ms", triptime/1000);
else if (triptime >= 10000)
printf(" time=%ld.%01ld ms", triptime/1000,
(triptime%1000)/100);
else if (triptime >= 1000)
printf(" time=%ld.%02ld ms", triptime/1000,
(triptime%1000)/10);
else
printf(" time=%ld.%03ld ms", triptime/1000,
triptime%1000);
}
if (dupflag)
printf(" (DUP!)");
if (csfailed)
printf(" (BAD CHECKSUM!)");
/* check the data */
cp = ((u_char*)ptr) + sizeof(struct timeval);
dp = &outpack[8 + sizeof(struct timeval)];
for (i = sizeof(struct timeval); i < datalen; ++i, ++cp, ++dp) {
if (*cp != *dp) {
printf("nwrong data byte #%d should be 0x%x but was 0x%x",
i, *dp, *cp);
cp = (u_char*)ptr + sizeof(struct timeval);
for (i = sizeof(struct timeval); i < datalen; ++i, ++cp) {
if ((i % 32) == sizeof(struct timeval))
printf("n#%dt", i);
printf("%x ", *cp);
}
break;
}
}
}
return 0;
}
static long llsqrt(long long a)
{
long long prev = ~((long long)1 << 63);
long long x = a;
if (x > 0) {
while (x < prev) {
prev = x;
x = (x+(a/x))/2;
}
}
return (long)x;
}
/*
* finish --
* Print out statistics, and give up.
*/
void finish(void)
{
struct timeval tv = cur_time;
tvsub(&tv, &start_time);
putchar('n');
fflush(stdout);
printf("--- %s ping statistics ---n", hostname);
printf("%ld packets transmitted, ", ntransmitted);
printf("%ld received", nreceived);
if (nrepeats)
printf(", +%ld duplicates", nrepeats);
if (nchecksum)
printf(", +%ld corrupted", nchecksum);
if (nerrors)
printf(", +%ld errors", nerrors);
if (ntransmitted) {
printf(", %d%% packet loss",
(int) ((((long long)(ntransmitted - nreceived)) * 100) /
ntransmitted));
printf(", time %ldms", 1000*tv.tv_sec+tv.tv_usec/1000);
}
putchar('n');
if (nreceived && timing) {
long tmdev;
tsum /= nreceived + nrepeats;
tsum2 /= nreceived + nrepeats;
tmdev = llsqrt(tsum2 - tsum * tsum);
printf("rtt min/avg/max/mdev = %ld.%03ld/%lu.%03ld/%ld.%03ld/%ld.%03ld ms",
tmin/1000, tmin%1000,
(unsigned long)(tsum/1000), (long)(tsum%1000),
tmax/1000, tmax%1000,
tmdev/1000, tmdev%1000
);
}
if (pipesize > 1)
printf(", pipe %d", pipesize);
if (ntransmitted > 1 && (!interval || (options&(F_FLOOD|F_ADAPTIVE)))) {
int ipg = (1000000*(long long)tv.tv_sec+tv.tv_usec)/(ntransmitted-1);
printf(", ipg/ewma %d.%03d/%d.%03d ms",
ipg/1000, ipg%1000, rtt/8000, (rtt/8)%1000);
}
putchar('n');
exit(!nreceived || (deadline && nreceived < npackets));
}
void status(void)
{
int loss = 0;
long tavg = 0;
status_snapshot = 0;
if (ntransmitted)
loss = (((long long)(ntransmitted - nreceived)) * 100) / ntransmitted;
fprintf(stderr, "r%ld/%ld packets, %d%% loss", ntransmitted, nreceived, loss);
if (nreceived && timing) {
tavg = tsum / (nreceived + nrepeats);
fprintf(stderr, ", min/avg/ewma/max = %ld.%03ld/%lu.%03ld/%d.%03d/%ld.%03ld ms",
tmin/1000, tmin%1000,
tavg/1000, tavg%1000,
rtt/8000, (rtt/8)%1000,
tmax/1000, tmax%1000
);
}
fprintf(stderr, "n");
}
/* PING COMMON */
#define MAXIPLEN 60
#define MAXICMPLEN 76
#define NROUTES 9 /* number of record route slots */
#define TOS_MAX 255 /* 8-bit TOS field */
static int ts_type;
static int nroute = 0;
static __u32 route[10];
struct sockaddr_in whereto; /* who to ping */
int optlen = 0;
int settos = 0; /* Set TOS, Precendence or other QOS options */
int icmp_sock; /* socket file descriptor */
u_char outpack[0x10000];
int maxpacket = sizeof(outpack);
static int broadcast_pings = 0;
static char *pr_addr(__u32);
static void pr_options(unsigned char * cp, int hlen);
static void pr_iph(struct iphdr *ip);
static void usage(void) __attribute__((noreturn));
static u_short in_cksum(const u_short *addr, int len, u_short salt);
static void pr_icmph(__u8 type, __u8 code, __u32 info, struct icmphdr *icp);
static int parsetos(char *str);
static struct {
struct cmsghdr cm;
struct in_pktinfo ipi;
} cmsg = { {sizeof(struct cmsghdr) + sizeof(struct in_pktinfo), SOL_IP, IP_PKTINFO},
{0, }};
int cmsg_len;
struct sockaddr_in source;
char *device;
int pmtudisc = -1;
int receive_error_msg()
{
int res;
char cbuf[512];
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
struct sock_extended_err *e;
struct icmphdr icmph;
struct sockaddr_in target;
int net_errors = 0;
int local_errors = 0;
int saved_errno = errno;
iov.iov_base = &icmph;
iov.iov_len = sizeof(icmph);
msg.msg_name = (void*)⌖
msg.msg_namelen = sizeof(target);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_flags = 0;
msg.msg_control = cbuf;
msg.msg_controllen = sizeof(cbuf);
res = recvmsg(icmp_sock, &msg, MSG_ERRQUEUE|MSG_DONTWAIT);
if (res < 0)
goto out;
e = NULL;
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
if (cmsg->cmsg_level == SOL_IP) {
if (cmsg->cmsg_type == IP_RECVERR)
e = (struct sock_extended_err *)CMSG_DATA(cmsg);
}
}
if (e == NULL)
abort();
if (e->ee_origin == SO_EE_ORIGIN_LOCAL) {
local_errors++;
if (options & F_QUIET)
goto out;
if (options & F_FLOOD)
write(STDOUT_FILENO, "E", 1);
else if (e->ee_errno != EMSGSIZE)
fprintf(stderr, "ping: local error: %sn", strerror(e->ee_errno));
else
fprintf(stderr, "ping: local error: Message too long, mtu=%un", e->ee_info);
nerrors++;
} else if (e->ee_origin == SO_EE_ORIGIN_ICMP) {
struct sockaddr_in *sin = (struct sockaddr_in*)(e+1);
if (res < sizeof(icmph) ||
target.sin_addr.s_addr != whereto.sin_addr.s_addr ||
icmph.type != ICMP_ECHO ||
icmph.un.echo.id != ident) {
/* Not our error, not an error at all. Clear. */
saved_errno = 0;
goto out;
}
acknowledge(ntohs(icmph.un.echo.sequence));
if (!working_recverr) {
struct icmp_filter filt;
working_recverr = 1;
/* OK, it works. Add stronger filter. */
filt.data = ~((1<<ICMP_SOURCE_QUENCH)|
(1<<ICMP_REDIRECT)|
(1<<ICMP_ECHOREPLY));
if (setsockopt(icmp_sock, SOL_RAW, ICMP_FILTER, (char*)&filt, sizeof(filt)) == -1)
perror("rWARNING: setsockopt(ICMP_FILTER)");
}
net_errors++;
nerrors++;
if (options & F_QUIET)
goto out;
if (options & F_FLOOD) {
write(STDOUT_FILENO, "bE", 2);
} else {
printf("From %s icmp_seq=%u ", pr_addr(sin->sin_addr.s_addr), ntohs(icmph.un.echo.sequence));
pr_icmph(e->ee_type, e->ee_code, e->ee_info, NULL);
fflush(stdout);
}
}
out:
errno = saved_errno;
return net_errors ? : -local_errors;
}
/*
* 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 VAX
* byte-order, to compute the round-trip time.
*/
int send_probe()
{
struct icmphdr *icp;
int cc;
int i;
icp = (struct icmphdr *)outpack;
icp->type = ICMP_ECHO;
icp->code = 0;
icp->checksum = 0;
icp->un.echo.sequence = htons(ntransmitted+1);
icp->un.echo.id = ident; /* ID */
CLR((ntransmitted+1) % mx_dup_ck);
if (timing) {
if (options&F_LATENCY) {
static volatile int fake_fucked_egcs = sizeof(struct timeval);
struct timeval tmp_tv;
gettimeofday(&tmp_tv, NULL);
/* egcs is crap or glibc is crap, but memcpy
does not copy anything, if len is constant! */
memcpy(icp+1, &tmp_tv, fake_fucked_egcs);
} else {
memset(icp+1, 0, sizeof(struct timeval));
}
}
cc = datalen + 8; /* skips ICMP portion */
/* compute ICMP checksum here */
icp->checksum = in_cksum((u_short *)icp, cc, 0);
if (timing && !(options&F_LATENCY)) {
static volatile int fake_fucked_egcs = sizeof(struct timeval);
struct timeval tmp_tv;
gettimeofday(&tmp_tv, NULL);
/* egcs is crap or glibc is crap, but memcpy
does not copy anything, if len is constant! */
memcpy(icp+1, &tmp_tv, fake_fucked_egcs);
icp->checksum = in_cksum((u_short *)(icp+1), fake_fucked_egcs, ~icp->checksum);
}
do {
static struct iovec iov = {outpack, 0};
static struct msghdr m = { &whereto, sizeof(whereto),
&iov, 1, &cmsg, 0, 0 };
m.msg_controllen = cmsg_len;
iov.iov_len = cc;
i = sendmsg(icmp_sock, &m, confirm);
confirm = 0;
} while (0);
return (cc == i ? 0 : i);
}
/*
* parse_reply --
* 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!).
*/
int
parse_reply(struct msghdr *msg, int cc, void *addr, struct timeval *tv)
{
struct sockaddr_in *from = addr;
__u8 *buf = msg->msg_iov->iov_base;
struct icmphdr *icp;
struct iphdr *ip;
int hlen;
int csfailed;
/* Check the IP header */
ip = (struct iphdr *)buf;
hlen = ip->ihl*4;
if (cc < hlen + 8 || ip->ihl < 5) {
if (options & F_VERBOSE)
fprintf(stderr, "ping: packet too short (%d bytes) from %sn", cc,
pr_addr(from->sin_addr.s_addr));
return 1;
}
/* Now the ICMP part */
cc -= hlen;
icp = (struct icmphdr *)(buf + hlen);
csfailed = in_cksum((u_short *)icp, cc, 0);
if (icp->type == ICMP_ECHOREPLY) {
if (icp->un.echo.id != ident)
return 1; /* 'Twas not our ECHO */
if (gather_statistics((__u8*)(icp+1), cc,
ntohs(icp->un.echo.sequence),
ip->ttl, 0, tv, pr_addr(from->sin_addr.s_addr)))
return 0;
} else {
/* We fall here when a redirect or source quench arrived.
* Also this branch processes icmp errors, when IP_RECVERR
* is broken. */
switch (icp->type) {
case ICMP_ECHO:
/* MUST NOT */
return 1;
case ICMP_SOURCE_QUENCH:
case ICMP_REDIRECT:
case ICMP_DEST_UNREACH:
case ICMP_TIME_EXCEEDED:
case ICMP_PARAMETERPROB:
{
struct iphdr * iph = (struct iphdr *)(&icp[1]);
struct icmphdr *icp1 = (struct icmphdr*)((unsigned char *)iph + iph->ihl*4);
int error_pkt;
if (cc < 8+sizeof(struct iphdr)+8 ||
cc < 8+iph->ihl*4+8)
return 1;
if (icp1->type != ICMP_ECHO ||
iph->daddr != whereto.sin_addr.s_addr ||
icp1->un.echo.id != ident)
return 1;
error_pkt = (icp->type != ICMP_REDIRECT &&
icp->type != ICMP_SOURCE_QUENCH);
if (error_pkt) {
acknowledge(ntohs(icp1->un.echo.sequence));
if (working_recverr) {
return 0;
} else {
static int once;
/* Sigh, IP_RECVERR for raw socket
* was broken until 2.4.9. So, we ignore
* the first error and warn on the second.
*/
if (once++ == 1)
fprintf(stderr, "rWARNING: kernel is not very fresh, upgrade is recommended.n");
if (once == 1)
return 0;
}
}
nerrors+=error_pkt;
if (options&F_QUIET)
return !error_pkt;
if (options & F_FLOOD) {
if (error_pkt)
write(STDOUT_FILENO, "bE", 2);
return !error_pkt;
}
printf("From %s: icmp_seq=%u ",
pr_addr(from->sin_addr.s_addr),
ntohs(icp1->un.echo.sequence));
if (csfailed)
printf("(BAD CHECKSUM)");
pr_icmph(icp->type, icp->code, ntohl(icp->un.gateway), icp);
return !error_pkt;
}
default:
/* MUST NOT */
break;
}
if ((options & F_FLOOD) && !(options & (F_VERBOSE|F_QUIET))) {
if (!csfailed)
write(STDOUT_FILENO, "!E", 2);
else
write(STDOUT_FILENO, "!EC", 3);
return 0;
}
if (!(options & F_VERBOSE) || uid)
return 0;
printf("From %s: ", pr_addr(from->sin_addr.s_addr));
if (csfailed) {
printf("(BAD CHECKSUM)n");
return 0;
}
pr_icmph(icp->type, icp->code, ntohl(icp->un.gateway), icp);
return 0;
}
if (!(options & F_FLOOD)) {
pr_options(buf + sizeof(struct iphdr), hlen);
if (options & F_AUDIBLE)
putchar('a');
putchar('n');
fflush(stdout);
}
return 0;
}
u_short
in_cksum(const u_short *addr, register int len, u_short csum)
{
register int nleft = len;
const u_short *w = addr;
register u_short answer;
register int sum = csum;
/*
* Our algorithm is simple, using a 32 bit accumulator (sum),
* we add sequential 16 bit words to it, and at the end, fold
* back all the carry bits from the top 16 bits into the lower
* 16 bits.
*/
while (nleft > 1) {
sum += *w++;
nleft -= 2;
}
/* mop up an odd byte, if necessary */
if (nleft == 1)
sum += htons(*(u_char *)w << 8);
/*
* 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);
}
/*
* pr_icmph --
* Print a descriptive string about an ICMP header.
*/
void pr_icmph(__u8 type, __u8 code, __u32 info, struct icmphdr *icp)
{
switch(type) {
case ICMP_ECHOREPLY:
printf("Echo Replyn");
/* XXX ID + Seq + Data */
break;
case ICMP_DEST_UNREACH:
switch(code) {
case ICMP_NET_UNREACH:
printf("Destination Net Unreachablen");
break;
case ICMP_HOST_UNREACH:
printf("Destination Host Unreachablen");
break;
case ICMP_PROT_UNREACH:
printf("Destination Protocol Unreachablen");
break;
case ICMP_PORT_UNREACH:
printf("Destination Port Unreachablen");
break;
case ICMP_FRAG_NEEDED:
printf("Frag needed and DF set (mtu = %u)n", info);
break;
case ICMP_SR_FAILED:
printf("Source Route Failedn");
break;
case ICMP_PKT_FILTERED:
printf("Packet filteredn");
break;
default:
printf("Dest Unreachable, Bad Code: %dn", code);
break;
}
if (icp && (options & F_VERBOSE))
pr_iph((struct iphdr*)(icp + 1));
break;
case ICMP_SOURCE_QUENCH:
printf("Source Quenchn");
if (icp && (options & F_VERBOSE))
pr_iph((struct iphdr*)(icp + 1));
break;
case ICMP_REDIRECT:
switch(code) {
case ICMP_REDIR_NET:
printf("Redirect Network");
break;
case ICMP_REDIR_HOST:
printf("Redirect Host");
break;
case ICMP_REDIR_NETTOS:
printf("Redirect Type of Service and Network");
break;
case ICMP_REDIR_HOSTTOS:
printf("Redirect Type of Service and Host");
break;
default:
printf("Redirect, Bad Code: %d", code);
break;
}
if (icp)
printf("(New nexthop: %s)n", pr_addr(icp->un.gateway));
if (icp && (options & F_VERBOSE))
pr_iph((struct iphdr*)(icp + 1));
break;
case ICMP_ECHO:
printf("Echo Requestn");
/* XXX ID + Seq + Data */
break;
case ICMP_TIME_EXCEEDED:
switch(code) {
case ICMP_EXC_TTL:
printf("Time to live exceededn");
break;
case ICMP_EXC_FRAGTIME:
printf("Frag reassembly time exceededn");
break;
default:
printf("Time exceeded, Bad Code: %dn", code);
break;
}
if (icp && (options & F_VERBOSE))
pr_iph((struct iphdr*)(icp + 1));
break;
case ICMP_PARAMETERPROB:
printf("Parameter problem: pointer = %un", icp ? (ntohl(icp->un.gateway)>>24) : info);
if (icp && (options & F_VERBOSE))
pr_iph((struct iphdr*)(icp + 1));
break;
case ICMP_TIMESTAMP:
printf("Timestampn");
/* XXX ID + Seq + 3 timestamps */
break;
case ICMP_TIMESTAMPREPLY:
printf("Timestamp Replyn");
/* XXX ID + Seq + 3 timestamps */
break;
case ICMP_INFO_REQUEST:
printf("Information Requestn");
/* XXX ID + Seq */
break;
case ICMP_INFO_REPLY:
printf("Information Replyn");
/* XXX ID + Seq */
break;
#ifdef ICMP_MASKREQ
case ICMP_MASKREQ:
printf("Address Mask Requestn");
break;
#endif
#ifdef ICMP_MASKREPLY
case ICMP_MASKREPLY:
printf("Address Mask Replyn");
break;
#endif
default:
printf("Bad ICMP type: %dn", type);
}
}
void pr_options(unsigned char * cp, int hlen)
{
int i, j;
int optlen, totlen;
unsigned char * optptr;
static int old_rrlen;
static char old_rr[MAX_IPOPTLEN];
totlen = hlen-sizeof(struct iphdr);
optptr = cp;
while (totlen > 0) {
if (*optptr == IPOPT_EOL)
break;
if (*optptr == IPOPT_NOP) {
totlen--;
optptr++;
printf("nNOP");
continue;
}
cp = optptr;
optlen = optptr[1];
if (optlen < 2 || optlen > totlen)
break;
switch (*cp) {
case IPOPT_SSRR:
case IPOPT_LSRR:
printf("n%cSRR: ", *cp==IPOPT_SSRR ? 'S' : 'L');
j = *++cp;
i = *++cp;
i -= 4;
cp++;
if (j > IPOPT_MINOFF) {
for (;;) {
__u32 address;
memcpy(&address, cp, 4);
cp += 4;
if (address == 0)
printf("t0.0.0.0");
else
printf("t%s", pr_addr(address));
j -= 4;
putchar('n');
if (j <= IPOPT_MINOFF)
break;
}
}
break;
case IPOPT_RR:
j = *++cp; /* get length */
i = *++cp; /* and pointer */
if (i > j)
i = j;
i -= IPOPT_MINOFF;
if (i <= 0)
continue;
if (i == old_rrlen
&& !memcmp((char *)cp, old_rr, i)
&& !(options & F_FLOOD)) {
printf("t(same route)");
i = ((i + 3) / 4) * 4;
cp += i;
break;
}
old_rrlen = i;
memcpy((char *)cp, old_rr, i);
printf("nRR: ");
cp++;
for (;;) {
__u32 address;
memcpy(&address, cp, 4);
cp += 4;
if (address == 0)
printf("t0.0.0.0");
else
printf("t%s", pr_addr(address));
i -= 4;
putchar('n');
if (i <= 0)
break;
}
break;
case IPOPT_TS:
{
int stdtime = 0, nonstdtime = 0;
__u8 flags;
j = *++cp; /* get length */
i = *++cp; /* and pointer */
if (i > j)
i = j;
i -= 5;
if (i <= 0)
continue;
flags = *++cp;
printf("nTS: ");
cp++;
for (;;) {
long l;
if ((flags&0xF) != IPOPT_TS_TSONLY) {
__u32 address;
memcpy(&address, cp, 4);
cp += 4;
if (address == 0)
printf("t0.0.0.0");
else
printf("t%s", pr_addr(address));
i -= 4;
if (i <= 0)
break;
}
l = *cp++;
l = (l<<8) + *cp++;
l = (l<<8) + *cp++;
l = (l<<8) + *cp++;
if (l & 0x80000000) {
if (nonstdtime==0)
printf("t%ld absolute not-standard", l&0x7fffffff);
else
printf("t%ld not-standard", (l&0x7fffffff) - nonstdtime);
nonstdtime = l&0x7fffffff;
} else {
if (stdtime==0)
printf("t%ld absolute", l);
else
printf("t%ld", l - stdtime);
stdtime = l;
}
i -= 4;
putchar('n');
if (i <= 0)
break;
}
if (flags>>4)
printf("Unrecorded hops: %dn", flags>>4);
break;
}
default:
printf("nunknown option %x", *cp);
break;
}
totlen -= optlen;
optptr += optlen;
}
}
/*
* pr_iph --
* Print an IP header with options.
*/
void pr_iph(struct iphdr *ip)
{
int hlen;
u_char *cp;
hlen = ip->ihl << 2;
cp = (u_char *)ip + 20; /* point to options */
printf("Vr HL TOS Len ID Flg off TTL Pro cks Src Dst Datan");
printf(" %1x %1x %02x %04x %04x",
ip->version, ip->ihl, ip->tos, ip->tot_len, ip->id);
printf(" %1x %04x", ((ip->frag_off) & 0xe000) >> 13,
(ip->frag_off) & 0x1fff);
printf(" %02x %02x %04x", ip->ttl, ip->protocol, ip->check);
printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->saddr));
printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->daddr));
printf("n");
pr_options(cp, hlen);
}
/*
* pr_addr --
* Return an ascii host address as a dotted quad and optionally with
* a hostname.
*/
char *
pr_addr(__u32 addr)
{
struct hostent *hp;
static char buf[4096];
if ((options & F_NUMERIC) ||
!(hp = gethostbyaddr((char *)&addr, 4, AF_INET)))
sprintf(buf, "%s", inet_ntoa(*(struct in_addr *)&addr));
else
snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name,
inet_ntoa(*(struct in_addr *)&addr));
return(buf);
}
/* Set Type of Service (TOS) and other Quality of Service relating bits */
int parsetos(char *str)
{
const char *cp;
int tos;
char *ep;
/* handle both hex and decimal values */
if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) {
cp = str + 2;
tos = (int)strtol(cp, &ep, 16);
} else
tos = (int)strtol(str, &ep, 10);
/* doesn't look like decimal or hex, eh? */
if (*ep != ' ') {
fprintf(stderr, "ping: "%s" bad value for TOSn", str);
exit(2);
}
if (tos > TOS_MAX) {
fprintf(stderr, "ping: the decimal value of TOS bits must be 0-254 (or zero)n");
exit(2);
}
return(tos);
}
#include <linux/filter.h>
void install_filter(void)
{
static int once;
static struct sock_filter insns[] = {
BPF_STMT(BPF_LDX|BPF_B|BPF_MSH, 0), /* Skip IP header. F..g BSD... Look into ping6. */
BPF_STMT(BPF_LD|BPF_H|BPF_IND, 4), /* Load icmp echo ident */
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0xAAAA, 0, 1), /* Ours? */
BPF_STMT(BPF_RET|BPF_K, ~0U), /* Yes, it passes. */
BPF_STMT(BPF_LD|BPF_B|BPF_IND, 0), /* Load icmp type */
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, ICMP_ECHOREPLY, 1, 0), /* Echo? */
BPF_STMT(BPF_RET|BPF_K, 0xFFFFFFF), /* No. It passes. */
BPF_STMT(BPF_RET|BPF_K, 0) /* Echo with wrong ident. Reject. */
};
static struct sock_fprog filter = {
sizeof insns / sizeof(insns[0]),
insns
};
if (once)
return;
once = 1;
/* Patch bpflet for current identifier. */
insns[2] = (struct sock_filter)BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, htons(ident), 0, 1);
if (setsockopt(icmp_sock, SOL_SOCKET, SO_ATTACH_FILTER, &filter, sizeof(filter)))
perror("WARNING: failed to install socket filtern");
}
void usage(void)
{
fprintf(stderr,
"Usage: ping [-LRUbdfnqrvVaA] [-c count] [-i interval] [-w deadline]n"
" [-p pattern] [-s packetsize] [-t ttl] [-I interface or address]n"
" [-M mtu discovery hint] [-S sndbuf]n"
" [ -T timestamp option ] [ -Q tos ] [hop1 ...] destinationn");
exit(2);
}
int main(int argc, char *argv[])
{
struct hostent *hp;
int ch, hold, packlen;
int socket_errno;
u_char *packet;
char *target, hnamebuf[MAXHOSTNAMELEN];
char rspace[3 + 4 * NROUTES + 1]; /* record route space */
icmp_sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
socket_errno = errno;
/* if we were setuid root, undo that */
if (setuid(getuid())) return -1;
source.sin_family = AF_INET;
preload = 1;
while ((ch = getopt(argc, argv, COMMON_OPTSTR "bRT:")) != EOF) {
switch(ch) {
case 'b':
broadcast_pings = 1;
break;
case 'Q':
settos = parsetos(optarg);
if (settos &&
(setsockopt(icmp_sock, IPPROTO_IP, IP_TOS,
(char *)&settos, sizeof(int)) < 0)) {
perror("ping: error setting QOS sockopts");
exit(2);
}
break;
case 'R':
if (options & F_TIMESTAMP) {
fprintf(stderr, "Only one of -T or -R may be usedn");
exit(2);
}
options |= F_RROUTE;
break;
case 'T':
if (options & F_RROUTE) {
fprintf(stderr, "Only one of -T or -R may be usedn");
exit(2);
}
options |= F_TIMESTAMP;
if (strcmp(optarg, "tsonly") == 0)
ts_type = IPOPT_TS_TSONLY;
else if (strcmp(optarg, "tsandaddr") == 0)
ts_type = IPOPT_TS_TSANDADDR;
else if (strcmp(optarg, "tsprespec") == 0)
ts_type = IPOPT_TS_PRESPEC;
else {
fprintf(stderr, "Invalid timestamp typen");
exit(2);
}
break;
case 'I':
{
char dummy;
int i1, i2, i3, i4;
if (sscanf(optarg, "%u.%u.%u.%u%c",
&i1, &i2, &i3, &i4, &dummy) == 4) {
__u8 *ptr;
ptr = (__u8*)&source.sin_addr;
ptr[0] = i1;
ptr[1] = i2;
ptr[2] = i3;
ptr[3] = i4;
options |= F_STRICTSOURCE;
} else {
device = optarg;
}
break;
}
case 'M':
if (strcmp(optarg, "do") == 0)
pmtudisc = IP_PMTUDISC_DO;
else if (strcmp(optarg, "dont") == 0)
pmtudisc = IP_PMTUDISC_DONT;
else if (strcmp(optarg, "want") == 0)
pmtudisc = IP_PMTUDISC_WANT;
else {
fprintf(stderr, "ping: wrong value for -M: do, dont, want are valid ones.n");
exit(2);
}
break;
case 'V':
printf("ping utility, iputils-ssn");
exit(0);
COMMON_OPTIONS
common_options(ch);
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc == 0)
usage();
if (argc > 1) {
if (options & F_RROUTE)
usage();
else if (options & F_TIMESTAMP) {
if (ts_type != IPOPT_TS_PRESPEC)
usage();
if (argc > 5)
usage();
} else {
if (argc > 10)
usage();
options |= F_SOURCEROUTE;
}
}
while (argc > 0) {
target = *argv;
bzero((char *)&whereto, sizeof(whereto));
whereto.sin_family = AF_INET;
if (inet_aton(target, &whereto.sin_addr) == 1) {
hostname = target;
if (argc == 1)
options |= F_NUMERIC;
} else {
hp = gethostbyname(target);
hp = gethostbyname(target);
hp = gethostbyname(target);
if (!hp) {
fprintf(stderr, "ping: unknown host %sn", target);
exit(2);
}
memcpy(&whereto.sin_addr, hp->h_addr, 4);
strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1);
hnamebuf[sizeof(hnamebuf) - 1] = 0;
hostname = hnamebuf;
}
if (argc > 1)
route[nroute++] = whereto.sin_addr.s_addr;
argc--;
argv++;
}
if (source.sin_addr.s_addr == 0) {
int alen;
struct sockaddr_in dst = whereto;
int probe_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (probe_fd < 0) {
perror("socket");
exit(2);
}
if (device) {
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, device, IFNAMSIZ-1);
if (setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device)+1) == -1) {
if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
struct ip_mreqn imr;
if (ioctl(probe_fd, SIOCGIFINDEX, &ifr) < 0) {
fprintf(stderr, "ping: unknown iface %sn", device);
exit(2);
}
memset(&imr, 0, sizeof(imr));
imr.imr_ifindex = ifr.ifr_ifindex;
if (setsockopt(probe_fd, SOL_IP, IP_MULTICAST_IF, &imr, sizeof(imr)) == -1) {
perror("ping: IP_MULTICAST_IF");
exit(2);
}
}
}
}
if (settos &&
setsockopt(probe_fd, IPPROTO_IP, IP_TOS, (char *)&settos, sizeof(int)) < 0)
perror("Warning: error setting QOS sockopts");
dst.sin_port = htons(1025);
if (nroute)
dst.sin_addr.s_addr = route[0];
if (connect(probe_fd, (struct sockaddr*)&dst, sizeof(dst)) == -1) {
if (errno == EACCES) {
if (broadcast_pings == 0) {
fprintf(stderr, "Do you want to ping broadcast? Then -bn");
exit(2);
}
fprintf(stderr, "WARNING: pinging broadcast addressn");
if (setsockopt(probe_fd, SOL_SOCKET, SO_BROADCAST,
&broadcast_pings, sizeof(broadcast_pings)) < 0) {
perror ("can't set broadcasting");
exit(2);
}
if (connect(probe_fd, (struct sockaddr*)&dst, sizeof(dst)) == -1) {
perror("connect");
exit(2);
}
} else {
perror("connect");
exit(2);
}
}
alen = sizeof(source);
if (getsockname(probe_fd, (struct sockaddr*)&source, &alen) == -1) {
perror("getsockname");
exit(2);
}
source.sin_port = 0;
close(probe_fd);
} while (0);
if (whereto.sin_addr.s_addr == 0)
whereto.sin_addr.s_addr = source.sin_addr.s_addr;
if (icmp_sock < 0) {
errno = socket_errno;
perror("ping: icmp open socket");
exit(2);
}
if (device) {
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, device, IFNAMSIZ-1);
if (ioctl(icmp_sock, SIOCGIFINDEX, &ifr) < 0) {
fprintf(stderr, "ping: unknown iface %sn", device);
exit(2);
}
cmsg.ipi.ipi_ifindex = ifr.ifr_ifindex;
cmsg_len = sizeof(cmsg);
}
if (broadcast_pings || IN_MULTICAST(ntohl(whereto.sin_addr.s_addr))) {
if (uid) {
if (interval < 1000) {
fprintf(stderr, "ping: broadcast ping with too short interval.n");
exit(2);
}
if (pmtudisc >= 0 && pmtudisc != IP_PMTUDISC_DO) {
fprintf(stderr, "ping: broadcast ping does not fragment.n");
exit(2);
}
}
if (pmtudisc < 0)
pmtudisc = IP_PMTUDISC_DO;
}
if (pmtudisc >= 0) {
if (setsockopt(icmp_sock, SOL_IP, IP_MTU_DISCOVER, &pmtudisc, sizeof(pmtudisc)) == -1) {
perror("ping: IP_MTU_DISCOVER");
exit(2);
}
}
if ((options&F_STRICTSOURCE) &&
bind(icmp_sock, (struct sockaddr*)&source, sizeof(source)) == -1) {
perror("bind");
exit(2);
}
if (1) {
struct icmp_filter filt;
filt.data = ~((1<<ICMP_SOURCE_QUENCH)|
(1<<ICMP_DEST_UNREACH)|
(1<<ICMP_TIME_EXCEEDED)|
(1<<ICMP_PARAMETERPROB)|
(1<<ICMP_REDIRECT)|
(1<<ICMP_ECHOREPLY));
if (setsockopt(icmp_sock, SOL_RAW, ICMP_FILTER, (char*)&filt, sizeof(filt)) == -1)
perror("WARNING: setsockopt(ICMP_FILTER)");
}
hold = 1;
if (setsockopt(icmp_sock, SOL_IP, IP_RECVERR, (char *)&hold, sizeof(hold)))
fprintf(stderr, "WARNING: your kernel is veeery old. No problems.n");
/* record route option */
if (options & F_RROUTE) {
bzero(rspace, sizeof(rspace));
rspace[0] = IPOPT_NOP;
rspace[1+IPOPT_OPTVAL] = IPOPT_RR;
rspace[1+IPOPT_OLEN] = sizeof(rspace)-1;
rspace[1+IPOPT_OFFSET] = IPOPT_MINOFF;
optlen = 40;
if (setsockopt(icmp_sock, IPPROTO_IP, IP_OPTIONS, rspace, sizeof(rspace)) < 0) {
perror("ping: record route");
exit(2);
}
}
if (options & F_TIMESTAMP) {
bzero(rspace, sizeof(rspace));
rspace[0] = IPOPT_TIMESTAMP;
rspace[1] = (ts_type==IPOPT_TS_TSONLY ? 40 : 36);
rspace[2] = 5;
rspace[3] = ts_type;
if (ts_type == IPOPT_TS_PRESPEC) {
int i;
rspace[1] = 4+nroute*8;
for (i=0; i<nroute; i++)
*(__u32*)&rspace[4+i*8] = route[i];
}
if (setsockopt(icmp_sock, IPPROTO_IP, IP_OPTIONS, rspace, rspace[1]) < 0) {
rspace[3] = 2;
if (setsockopt(icmp_sock, IPPROTO_IP, IP_OPTIONS, rspace, rspace[1]) < 0) {
perror("ping: ts option");
exit(2);
}
}
optlen = 40;
}
if (options & F_SOURCEROUTE) {
int i;
bzero(rspace, sizeof(rspace));
rspace[0] = IPOPT_NOOP;
rspace[1+IPOPT_OPTVAL] = (options & F_SO_DONTROUTE) ? IPOPT_SSRR
: IPOPT_LSRR;
rspace[1+IPOPT_OLEN] = 3 + nroute*4;
rspace[1+IPOPT_OFFSET] = IPOPT_MINOFF;
for (i=0; i<nroute; i++)
*(__u32*)&rspace[4+i*4] = route[i];
if (setsockopt(icmp_sock, IPPROTO_IP, IP_OPTIONS, rspace, 4 + nroute*4) < 0) {
perror("ping: record route");
exit(2);
}
optlen = 40;
}
/* Estimate memory eaten by single packet. It is rough estimate.
* Actually, for small datalen's it depends on kernel side a lot. */
hold = datalen + 8;
hold += ((hold+511)/512)*(optlen + 20 + 16 + 64 + 160);
sock_setbufs(icmp_sock, hold);
if (broadcast_pings) {
if (setsockopt(icmp_sock, SOL_SOCKET, SO_BROADCAST,
&broadcast_pings, sizeof(broadcast_pings)) < 0) {
perror ("ping: can't set broadcasting");
exit(2);
}
}
if (options & F_NOLOOP) {
int loop = 0;
if (setsockopt(icmp_sock, IPPROTO_IP, IP_MULTICAST_LOOP,
&loop, 1) == -1) {
perror ("ping: can't disable multicast loopback");
exit(2);
}
}
if (options & F_TTL) {
int ittl = ttl;
if (setsockopt(icmp_sock, IPPROTO_IP, IP_MULTICAST_TTL,
&ttl, 1) == -1) {
perror ("ping: can't set multicast time-to-live");
exit(2);
}
if (setsockopt(icmp_sock, IPPROTO_IP, IP_TTL,
&ittl, sizeof(ittl)) == -1) {
perror ("ping: can't set unicast time-to-live");
exit(2);
}
}
if (datalen > 0xFFFF - 8 - optlen - 20) {
if (uid || datalen > sizeof(outpack)-8) {
fprintf(stderr, "Error: packet size %d is too large. Maximum is %dn", datalen, 0xFFFF-8-20-optlen);
exit(2);
}
/* Allow small oversize to root yet. It will cause EMSGSIZE. */
fprintf(stderr, "WARNING: packet size %d is too large. Maximum is %dn", datalen, 0xFFFF-8-20-optlen);
}
if (datalen >= sizeof(struct timeval)) /* can we time transfer */
timing = 1;
packlen = datalen + MAXIPLEN + MAXICMPLEN;
if (!(packet = (u_char *)malloc((u_int)packlen))) {
fprintf(stderr, "ping: out of memory.n");
exit(2);
}
printf("PING %s (%s) ", hostname, inet_ntoa(whereto.sin_addr));
if (device || (options&F_STRICTSOURCE))
printf("from %s %s: ", inet_ntoa(source.sin_addr), device ?: "");
printf("%d(%d) bytes of data.n", datalen, datalen+8+optlen+20);
setup(icmp_sock);
main_loop(icmp_sock, packet, packlen);
return 0;
}
void *dlopen(const char *filename, int flag) { return 0; }
char *dlerror(void) { return 0; }
void *dlsym(void *handle, const char *symbol) { return 0; }
int dlclose(void *handle) { return 0; }ping_common.h
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <linux/sockios.h>
#include <sys/file.h>
#include <sys/time.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <sys/uio.h>
#include <sys/poll.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <linux/errqueue.h>
#define DEFDATALEN (64 - 8) /* default data length */
#define MAXWAIT 10 /* max seconds to wait for response */
#define MININTERVAL 10 /* Minimal interpacket gap */
#define MINUSERINTERVAL 200 /* Minimal allowed interval for non-root */
#define SCHINT(a) (((a) <= MININTERVAL) ? MININTERVAL : (a))
#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))
/* various options */
extern int options;
#define F_FLOOD 0x001
#define F_INTERVAL 0x002
#define F_NUMERIC 0x004
#define F_PINGFILLED 0x008
#define F_QUIET 0x010
#define F_RROUTE 0x020
#define F_SO_DEBUG 0x040
#define F_SO_DONTROUTE 0x080
#define F_VERBOSE 0x100
#define F_TIMESTAMP 0x200
#define F_FLOWINFO 0x200
#define F_SOURCEROUTE 0x400
#define F_TCLASS 0x400
#define F_FLOOD_POLL 0x800
#define F_LATENCY 0x1000
#define F_AUDIBLE 0x2000
#define F_ADAPTIVE 0x4000
#define F_STRICTSOURCE 0x8000
#define F_NOLOOP 0x10000
#define F_TTL 0x20000
/*
* MAX_DUP_CHK is the number of bits in received table, i.e. the maximum
* number of received sequence numbers we can keep track of.
*/
#define MAX_DUP_CHK 0x10000
extern int mx_dup_ck;
extern char rcvd_tbl[MAX_DUP_CHK / 8];
extern u_char outpack[];
extern int maxpacket;
extern int datalen;
extern char *hostname;
extern int uid;
extern int ident; /* process id to identify our packets */
extern int sndbuf;
extern int ttl;
extern long npackets; /* max packets to transmit */
extern long nreceived; /* # of packets we got back */
extern long nrepeats; /* number of duplicates */
extern long ntransmitted; /* sequence # for outbound packets = #sent */
extern long nchecksum; /* replies with bad checksum */
extern long nerrors; /* icmp errors */
extern int interval; /* interval between packets (msec) */
extern int preload;
extern int deadline; /* time to die */
extern int lingertime;
extern struct timeval start_time, cur_time;
extern volatile int exiting;
extern volatile int status_snapshot;
extern int confirm;
extern int confirm_flag;
extern int working_recverr;
#ifndef MSG_CONFIRM
#define MSG_CONFIRM 0
#endif
/* timing */
extern int timing; /* flag to do timing */
extern long tmin; /* minimum round trip time */
extern long tmax; /* maximum round trip time */
extern long long tsum; /* sum of all times, for doing average */
extern long long tsum2;
extern int rtt;
extern __u16 acked;
extern int pipesize;
#define COMMON_OPTIONS
case 'a': case 'U': case 'c': case 'd':
case 'f': case 'i': case 'w': case 'l':
case 'S': case 'n': case 'p': case 'q':
case 'r': case 's': case 'v': case 'L':
case 't': case 'A': case 'W': case 'B':
#define COMMON_OPTSTR "h?VQ:I:M:aUc:dfi:w:l:S:np:qrs:vLt:AW:B"
/*
* tvsub --
* Subtract 2 timeval structs: out = out - in. Out is assumed to
* be >= in.
*/
static inline void tvsub(struct timeval *out, struct timeval *in)
{
if ((out->tv_usec -= in->tv_usec) < 0) {
--out->tv_sec;
out->tv_usec += 1000000;
}
out->tv_sec -= in->tv_sec;
}
static inline void set_signal(int signo, void (*handler)(int))
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = (void (*)(int))handler;
#ifdef SA_INTERRUPT
sa.sa_flags = SA_INTERRUPT;
#endif
sigaction(signo, &sa, NULL);
}
extern int __schedule_exit(int next);
static inline int schedule_exit(int next)
{
if (npackets && ntransmitted >= npackets && !deadline)
next = __schedule_exit(next);
return next;
}
static inline int in_flight(void)
{
__u16 diff = (__u16)ntransmitted - acked;
return (diff<=0x7FFF) ? diff : ntransmitted-nreceived-nerrors;
}
static inline void acknowledge(__u16 seq)
{
__u16 diff = (__u16)ntransmitted - seq;
if (diff <= 0x7FFF) {
if ((int)diff+1 > pipesize)
pipesize = (int)diff+1;
if ((__s16)(seq - acked) > 0 ||
(__u16)ntransmitted - acked > 0x7FFF)
acked = seq;
}
}
static inline void advance_ntransmitted(void)
{
ntransmitted++;
/* Invalidate acked, if 16 bit seq overflows. */
if ((__u16)ntransmitted - acked > 0x7FFF)
acked = (__u16)ntransmitted + 1;
}
extern int send_probe(void);
extern int receive_error_msg(void);
extern int parse_reply(struct msghdr *msg, int len, void *addr, struct timeval *);
extern void install_filter(void);
extern int pinger(void);
extern void sock_setbufs(int icmp_sock, int alloc);
extern void setup(int icmp_sock);
extern void main_loop(int icmp_sock, __u8 *buf, int buflen) __attribute__((noreturn));
extern void finish(void) __attribute__((noreturn));
extern void status(void);
extern void common_options(int ch);
extern int gather_statistics(__u8 *ptr, int cc, __u16 seq, int hops,
int csfailed, struct timeval *tv, char *from);
最后
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