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from Cliff Frost
[unix-history] / usr / src / sbin / ping / ping.c
/*
* 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
* Modified at Uc Berkeley
* Record Route and verbose headers - Phil Dykstra, BRL, March 1988.
* ttl, duplicate detection - Cliff Frost, UCB, April 1989
* Pad pattern - Cliff Frost (from Tom Ferrin, UCSF), April 1989
* Wait for dribbles, option decoding, pkt compare - vjs@sgi.com, May 1989
*
* 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 <stdio.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/signal.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_var.h>
#include <ctype.h>
#include <netdb.h>
#define MAXWAIT 10 /* max time to wait for response, sec. */
#define MAXPACKET (65536-60-8) /* max packet size */
#define VERBOSE 1 /* verbose flag */
#define QUIET 2 /* quiet flag */
#define FLOOD 4 /* floodping flag */
#define RROUTE 8 /* record route flag */
#define PING_FILLED 16 /* is buffer filled? */
#define NUMERIC 32 /* don't do gethostbyaddr() calls */
#define INTERVAL 64 /* did user specify interval? */
#define NROUTES 9 /* number of record route slots */
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif
/* MAX_DUP_CHK is the number of bits in received table, ie the */
/* maximum number of received sequence numbers we can keep track of. */
/* Change 128 to 8192 for complete accuracy... */
#define MAX_DUP_CHK 8 * 128
int mx_dup_ck = MAX_DUP_CHK;
char rcvd_tbl[ MAX_DUP_CHK / 8 ];
int nrepeats = 0;
#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))
char *malloc();
u_char *packet;
int packlen;
int i, pingflags = 0, options;
extern int errno;
int s; /* Socket file descriptor */
struct hostent *hp; /* Pointer to host info */
struct timezone tz; /* leftover */
struct sockaddr whereto; /* Who to ping */
int datalen = 64-8; /* How much data */
char usage[] =
"Usage: ping [-dfnqrvR][-c count][-i wait][-l preload][-p pattern][-s packetsize][-h] host \n";
char *hostname;
char hnamebuf[MAXHOSTNAMELEN];
static u_char outpack[MAXPACKET];
int npackets=0;
int preload = 0; /* number of packets to "preload" */
int ntransmitted = 0; /* sequence # for outbound packets = #sent */
int ident;
unsigned interval=1; /* interval between packets */
int nreceived = 0; /* # of packets we got back */
int timing = 0;
int tmin = 999999999;
int tmax = 0;
int tsum = 0; /* sum of all times, for doing average */
int finish(), catcher();
int bufspace = 48*1024;
int prefinish();
char *inet_ntoa(),*strcpy(),*strncpy(),*sprintf();
char *pr_addr();
u_long inet_addr();
char rspace[3+4*NROUTES+1]; /* record route space */
/*
* M A I N
*/
main(argc, argv)
char *argv[];
{
struct sockaddr_in from;
/* char **av = argv; */
struct sockaddr_in *to = (struct sockaddr_in *) &whereto;
int c, k, on = 1, hostind = 0;
struct protoent *proto;
static u_char *datap = &outpack[8+sizeof(struct timeval)];
extern int optind;
extern char *optarg;
while ((c = getopt(argc, argv, "c:dfh:i:l:np:qrs:vR")) != EOF)
switch(c) {
case 'c':
npackets = atoi(optarg);
break;
case 'd':
options |= SO_DEBUG;
break;
case 'f':
pingflags |= FLOOD;
break;
case 'h':
hostind = optind-1;
break;
case 'i': /* wait between sending packets */
interval = atoi(optarg);
if (interval == 0)
interval = 1;
pingflags |= INTERVAL;
break;
case 'l':
preload = atoi(optarg);
break;
case 'n':
pingflags |= NUMERIC;
break;
case 'p': /* fill buffer with user pattern */
pingflags |= PING_FILLED;
fill((char *)datap, optarg);
break;
case 'q':
pingflags |= QUIET;
break;
case 'r':
options |= SO_DONTROUTE;
break;
case 's': /* size of packet to send */
datalen = atoi(optarg);
break;
case 'v':
pingflags |= VERBOSE;
break;
case 'R':
pingflags |= RROUTE;
break;
default:
printf(usage);
exit(1);
}
if (hostind == 0) {
if (optind != argc-1) {
fprintf(stderr, usage);
exit(1);
} else hostind = optind;
}
bzero((char *)&whereto, sizeof(struct sockaddr) );
to->sin_family = AF_INET;
to->sin_addr.s_addr = inet_addr(argv[hostind]);
if(to->sin_addr.s_addr != (unsigned)-1) {
strcpy(hnamebuf, argv[hostind]);
hostname = hnamebuf;
} else {
hp = gethostbyname(argv[hostind]);
if (hp) {
to->sin_family = hp->h_addrtype;
bcopy(hp->h_addr, (caddr_t)&to->sin_addr, hp->h_length);
strncpy( hnamebuf, hp->h_name, sizeof(hnamebuf)-1 );
hostname = hnamebuf;
} else {
printf("%s: unknown host %s\n", argv[0], argv[hostind]);
exit(1);
}
}
if ( (pingflags & FLOOD) && (pingflags & INTERVAL) ) {
fprintf(stderr, "ping: -f and -i incompatible options\n");
exit(1);
}
if (datalen > MAXPACKET) {
fprintf(stderr, "ping: packet size too large\n");
exit(1);
}
if (datalen >= sizeof(struct timeval)) /* can we time 'em? */
timing = 1;
packlen = datalen + 60 + 76; /* MAXIP + MAXICMP */
if( (packet = (u_char *)malloc((unsigned)packlen)) == NULL ) {
fprintf( stderr, "ping: malloc failed\n" );
exit(1);
}
if (!(pingflags & PING_FILLED)) {
for( k=8; k<datalen; k++) *datap++ = k;
}
ident = getpid() & 0xFFFF;
if ((proto = getprotobyname("icmp")) == NULL) {
fprintf(stderr, "icmp: unknown protocol\n");
exit(10);
}
if ((s = socket(AF_INET, SOCK_RAW, proto->p_proto)) < 0) {
perror("ping: socket");
exit(5);
}
if (options & SO_DEBUG) {
(void)setsockopt(s, SOL_SOCKET, SO_DEBUG, &on, sizeof(on));
}
if (options & SO_DONTROUTE) {
(void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, &on, sizeof(on));
}
/* Record Route option */
if( pingflags & RROUTE ) {
#ifdef IP_OPTIONS
rspace[IPOPT_OPTVAL] = IPOPT_RR;
rspace[IPOPT_OLEN] = sizeof(rspace)-1;
rspace[IPOPT_OFFSET] = IPOPT_MINOFF;
if( setsockopt(s, IPPROTO_IP, IP_OPTIONS, rspace, sizeof(rspace)) < 0 ) {
perror( "Record route" );
exit( 42 );
}
#else
fprintf( stderr, "ping: record route not available on this machine.\n" );
exit( 42 );
#endif IP_OPTIONS
}
if(to->sin_family == AF_INET) {
printf("PING %s (%s): %d data bytes\n", hostname,
inet_ntoa(*(struct in_addr *)&to->sin_addr.s_addr), datalen);
} else {
printf("PING %s: %d data bytes\n", hostname, datalen );
}
/* When pinging the broadcast address, you can get a lot
* of answers. Doing something so evil is useful if you
* are trying to stress the ethernet, or just want to
* fill the arp cache to get some stuff for /etc/ethers.
*/
(void)setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char*)&bufspace,
sizeof(bufspace));
signal( SIGINT, prefinish );
signal(SIGALRM, catcher);
/* fire off them quickies */
for(i=0; i < preload; i++)
pinger();
if(!(pingflags & FLOOD))
catcher(); /* start things going */
for (;;) {
int fromlen = sizeof (from);
int cc;
struct timeval timeout;
int fdmask = 1 << s;
timeout.tv_sec = 0;
timeout.tv_usec = 10000;
if(pingflags & FLOOD) {
pinger();
if( select(32, (fd_set *)&fdmask, (fd_set *)0, (fd_set *)0, &timeout) == 0)
continue;
}
if ( (cc=recvfrom(s, (char *)packet, packlen, 0, (struct sockaddr *)&from, &fromlen)) < 0) {
if( errno == EINTR )
continue;
perror("ping: recvfrom");
continue;
}
pr_pack( (char *)packet, cc, &from );
if (npackets && nreceived >= npackets)
finish();
}
/*NOTREACHED*/
}
/*
* C A T C H E R
*
* This routine causes another PING to be transmitted, and then
* schedules another SIGALRM for 1 second from now.
*
* Bug -
* Our sense of time will slowly skew (ie, packets will not be launched
* exactly at 1-second intervals). This does not affect the quality
* of the delay and loss statistics.
*/
catcher()
{
int waittime;
pinger();
signal(SIGALRM, catcher);
if (npackets == 0 || ntransmitted < npackets)
alarm(interval);
else {
if (nreceived) {
waittime = 2 * tmax / 1000;
if (waittime == 0)
waittime = 1;
} else
waittime = MAXWAIT;
signal(SIGALRM, finish);
alarm((unsigned)waittime);
}
}
/*
* P I N G E R
*
* 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.
*/
pinger()
{
register struct icmp *icp = (struct icmp *) outpack;
int i, cc;
register struct timeval *tp = (struct timeval *) &outpack[8];
icp->icmp_type = ICMP_ECHO;
icp->icmp_code = 0;
icp->icmp_cksum = 0;
icp->icmp_seq = ntransmitted++;
icp->icmp_id = ident; /* ID */
CLR( icp->icmp_seq % mx_dup_ck );
cc = datalen+8; /* skips ICMP portion */
if (timing)
gettimeofday( tp, &tz );
/* Compute ICMP checksum here */
icp->icmp_cksum = in_cksum( (u_short *)icp, cc );
/* cc = sendto(s, msg, len, flags, to, tolen) */
i = sendto( s, (char *)outpack, cc, 0, &whereto, sizeof(struct sockaddr) );
if( i < 0 || i != cc ) {
if( i<0 ) perror("sendto");
printf("ping: wrote %s %d chars, ret=%d\n",
hostname, cc, i );
fflush(stdout);
}
if( pingflags & FLOOD ) {
putchar('.');
fflush(stdout);
}
}
/*
* P R _ P A C K
*
* 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!).
*/
pr_pack( buf, cc, from )
char *buf;
int cc;
struct sockaddr_in *from;
{
struct ip *ip;
register struct icmp *icp;
register int i, j;
register u_char *cp,*dp;
static int old_rrlen;
static char old_rr[MAX_IPOPTLEN];
struct timeval tv;
struct timeval *tp;
int hlen, triptime, dupflag;
gettimeofday( &tv, &tz );
/* Check the IP header */
ip = (struct ip *) buf;
hlen = ip->ip_hl << 2;
if( cc < hlen + ICMP_MINLEN ) {
if( pingflags & VERBOSE )
printf("packet too short (%d bytes) from %s\n", cc,
inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr));
fflush(stdout);
return;
}
/* Now the ICMP part */
cc -= hlen;
icp = (struct icmp *)(buf + hlen);
if( icp->icmp_type == ICMP_ECHOREPLY ) {
if( icp->icmp_id != ident )
return; /* 'Twas not our ECHO */
nreceived++;
if (timing) {
#ifndef icmp_data
tp = (struct timeval *)&icp->icmp_ip;
#else
tp = (struct timeval *)&icp->icmp_data[0];
#endif
tvsub( &tv, tp );
triptime = tv.tv_sec*1000+(tv.tv_usec/1000);
tsum += triptime;
if( triptime < tmin )
tmin = triptime;
if( triptime > tmax )
tmax = triptime;
}
if ( TST(icp->icmp_seq%mx_dup_ck) ) {
nrepeats++, nreceived--;
dupflag=1;
} else {
SET(icp->icmp_seq%mx_dup_ck);
dupflag=0;
}
if( pingflags & QUIET )
return;
if( pingflags & FLOOD ) {
putchar('\b');
fflush(stdout);
} else {
printf("%d bytes from %s: icmp_seq=%d", cc,
inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr),
icp->icmp_seq );
if ( dupflag ) printf(" DUP!");
printf(" ttl=%d", ip->ip_ttl);
if (timing)
printf(" time=%d ms", triptime );
/* check the data */
cp = (u_char*)&icp->icmp_data[8];
dp = &outpack[8+sizeof(struct timeval)];
for (i=8; i<datalen; i++, cp++, dp++) {
if (*cp != *dp) {
printf("\nwrong data byte #%d should be 0x%x but was 0x%x",
i, *dp, *cp);
cp = (u_char*)&icp->icmp_data[0];
for (i=8; i<datalen; i++, cp++) {
if ((i%32) == 8)
printf("\n\t");
printf("%x ", *cp);
}
break;
}
}
}
} else {
/* We've got something other than an ECHOREPLY */
if( !(pingflags & VERBOSE) )
return;
printf("%d bytes from %s: ",
cc, pr_addr(from->sin_addr.s_addr) );
pr_icmph( icp );
}
/* Display any IP options */
cp = (u_char *)buf + sizeof(struct ip);
while (hlen > sizeof(struct ip) & (hlen >= 0)) { /* !ANSI C will */
register unsigned long l; /* force hlen to */
switch (*cp) { /* unsigned! */
case IPOPT_EOL:
hlen = 0;
break;
case IPOPT_LSRR:
printf("\nLSRR: ");
hlen -= 2;
j = *++cp;
++cp;
if (j > IPOPT_MINOFF) for (;;) {
l = *++cp;
l = (l<<8) + *++cp;
l = (l<<8) + *++cp;
l = (l<<8) + *++cp;
if (l == 0)
printf("\t0.0.0.0");
else
printf("\t%s", pr_addr(ntohl(l)));
hlen -= 4;
j -= 4;
if (j <= IPOPT_MINOFF)
break;
putchar('\n');
}
break;
case IPOPT_RR:
j = *++cp; /* get length */
i = *++cp; /* and pointer */
hlen -= 2;
if (i > j) i = j;
i -= IPOPT_MINOFF;
if (i <= 0)
continue;
if (i == old_rrlen
&& cp == (u_char *)buf + sizeof(struct ip) + 2
&& !bcmp((char *)cp, old_rr, i)
&& !(pingflags & FLOOD)) {
printf("\t(same route)");
i = ((i+3)/4)*4;
hlen -= i;
cp += i;
break;
}
old_rrlen = i;
bcopy((char *)cp, old_rr, i);
printf("\nRR: ");
for (;;) {
l = *++cp;
l = (l<<8) + *++cp;
l = (l<<8) + *++cp;
l = (l<<8) + *++cp;
if (l == 0)
printf("\t0.0.0.0");
else
printf("\t%s", pr_addr(ntohl(l)));
hlen -= 4;
i -= 4;
if (i <= 0)
break;
putchar('\n');
}
break;
case IPOPT_NOP:
printf("\nNOP");
break;
default:
printf("\nunknown option %x", *cp);
break;
}
hlen--;
cp++;
}
if (!(pingflags & FLOOD))
putchar('\n');
fflush(stdout);
}
/*
* I N _ C K S U M
*
* Checksum routine for Internet Protocol family headers (C Version)
*
*/
in_cksum(addr, len)
u_short *addr;
int len;
{
register int nleft = len;
register u_short *w = addr;
register int sum = 0;
u_short answer = 0;
/*
* Our algorithm is simple, using a 32 bit accumulator (sum),
* we add sequential 16 bit words to it, and at the end, fold
* back all the carry bits from the top 16 bits into the lower
* 16 bits.
*/
while( nleft > 1 ) {
sum += *w++;
nleft -= 2;
}
/* mop up an odd byte, if necessary */
if( nleft == 1 ) {
*(u_char *)(&answer) = *(u_char *)w ;
sum += answer;
}
/*
* add back carry outs from top 16 bits to low 16 bits
*/
sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
sum += (sum >> 16); /* add carry */
answer = ~sum; /* truncate to 16 bits */
return (answer);
}
/*
* T V S U B
*
* Subtract 2 timeval structs: out = out - in.
*
* Out is assumed to be >= in.
*/
tvsub( out, in )
register struct timeval *out, *in;
{
if( (out->tv_usec -= in->tv_usec) < 0 ) {
out->tv_sec--;
out->tv_usec += 1000000;
}
out->tv_sec -= in->tv_sec;
}
/* On the first SIGINT, allow any outstanding packets to dribble in */
prefinish()
{
if (nreceived >= ntransmitted /* quit now if caught up */
|| nreceived == 0) /* or if remote is dead */
finish();
signal(SIGINT, finish); /* do this only the 1st time */
npackets = ntransmitted+1; /* let the normal limit work */
}
/*
* F I N I S H
*
* Print out statistics, and give up.
* Heavily buffered STDIO is used here, so that all the statistics
* will be written with 1 sys-write call. This is nice when more
* than one copy of the program is running on a terminal; it prevents
* the statistics output from becomming intermingled.
*/
finish()
{
putchar('\n');
fflush(stdout);
printf("\n----%s PING Statistics----\n", hostname );
printf("%d packets transmitted, ", ntransmitted );
printf("%d packets received, ", nreceived );
if (nrepeats) printf("+%d duplicates, ", nrepeats );
if (ntransmitted)
if( nreceived > ntransmitted)
printf("-- somebody's printing up packets!");
else
printf("%d%% packet loss",
(int) (((ntransmitted-nreceived)*100) /
ntransmitted));
printf("\n");
if (nreceived && timing)
printf("round-trip (ms) min/avg/max = %d/%d/%d\n",
tmin,
tsum / (nreceived + nrepeats),
tmax );
fflush(stdout);
exit(0);
}
#if 0
static char *ttab[] = {
"Echo Reply", /* ip + seq + udata */
"Dest Unreachable", /* net, host, proto, port, frag, sr + IP */
"Source Quench", /* IP */
"Redirect", /* redirect type, gateway, + IP */
"Echo",
"Time Exceeded", /* transit, frag reassem + IP */
"Parameter Problem", /* pointer + IP */
"Timestamp", /* id + seq + three timestamps */
"Timestamp Reply", /* " */
"Info Request", /* id + sq */
"Info Reply" /* " */
};
#endif /* 0 */
/*
* Print a descriptive string about an ICMP header.
*/
pr_icmph( icp )
struct icmp *icp;
{
switch( icp->icmp_type ) {
case ICMP_ECHOREPLY:
printf("Echo Reply\n");
/* XXX ID + Seq + Data */
break;
case ICMP_UNREACH:
switch( icp->icmp_code ) {
case ICMP_UNREACH_NET:
printf("Destination Net Unreachable\n");
break;
case ICMP_UNREACH_HOST:
printf("Destination Host Unreachable\n");
break;
case ICMP_UNREACH_PROTOCOL:
printf("Destination Protocol Unreachable\n");
break;
case ICMP_UNREACH_PORT:
printf("Destination Port Unreachable\n");
break;
case ICMP_UNREACH_NEEDFRAG:
printf("frag needed and DF set\n");
break;
case ICMP_UNREACH_SRCFAIL:
printf("Source Route Failed\n");
break;
default:
printf("Dest Unreachable, Bad Code: %d\n", icp->icmp_code );
break;
}
/* Print returned IP header information */
#ifndef icmp_data
pr_retip( &icp->icmp_ip );
#else
pr_retip( (struct ip *)icp->icmp_data );
#endif
break;
case ICMP_SOURCEQUENCH:
printf("Source Quench\n");
#ifndef icmp_data
pr_retip( &icp->icmp_ip );
#else
pr_retip( (struct ip *)icp->icmp_data );
#endif
break;
case ICMP_REDIRECT:
switch( icp->icmp_code ) {
case ICMP_REDIRECT_NET:
printf("Redirect Network");
break;
case ICMP_REDIRECT_HOST:
printf("Redirect Host");
break;
case ICMP_REDIRECT_TOSNET:
printf("Redirect Type of Service and Network");
break;
case ICMP_REDIRECT_TOSHOST:
printf("Redirect Type of Service and Host");
break;
default:
printf("Redirect, Bad Code: %d", icp->icmp_code );
break;
}
printf(" (New addr: 0x%08x)\n", icp->icmp_hun.ih_gwaddr );
#ifndef icmp_data
pr_retip( &icp->icmp_ip );
#else
pr_retip( (struct ip *)icp->icmp_data );
#endif
break;
case ICMP_ECHO:
printf("Echo Request\n");
/* XXX ID + Seq + Data */
break;
case ICMP_TIMXCEED:
switch( icp->icmp_code ) {
case ICMP_TIMXCEED_INTRANS:
printf("Time to live exceeded\n");
break;
case ICMP_TIMXCEED_REASS:
printf("Frag reassembly time exceeded\n");
break;
default:
printf("Time exceeded, Bad Code: %d\n", icp->icmp_code );
break;
}
#ifndef icmp_data
pr_retip( &icp->icmp_ip );
#else
pr_retip( (struct ip *)icp->icmp_data );
#endif
break;
case ICMP_PARAMPROB:
printf("Parameter problem: pointer = 0x%02x\n",
icp->icmp_hun.ih_pptr );
#ifndef icmp_data
pr_retip( &icp->icmp_ip );
#else
pr_retip( (struct ip *)icp->icmp_data );
#endif
break;
case ICMP_TSTAMP:
printf("Timestamp\n");
/* XXX ID + Seq + 3 timestamps */
break;
case ICMP_TSTAMPREPLY:
printf("Timestamp Reply\n");
/* XXX ID + Seq + 3 timestamps */
break;
case ICMP_IREQ:
printf("Information Request\n");
/* XXX ID + Seq */
break;
case ICMP_IREQREPLY:
printf("Information Reply\n");
/* XXX ID + Seq */
break;
#ifdef ICMP_MASKREQ
case ICMP_MASKREQ:
printf("Address Mask Request\n");
break;
#endif
#ifdef ICMP_MASKREPLY
case ICMP_MASKREPLY:
printf("Address Mask Reply\n");
break;
#endif
default:
printf("Bad ICMP type: %d\n", icp->icmp_type);
}
}
/*
* Print an IP header with options.
*/
pr_iph( ip )
struct ip *ip;
{
int hlen;
unsigned char *cp;
hlen = ip->ip_hl << 2;
cp = (unsigned char *)ip + 20; /* point to options */
printf("Vr HL TOS Len ID Flg off TTL Pro cks Src Dst Data\n");
printf(" %1x %1x %02x %04x %04x",
ip->ip_v, ip->ip_hl, ip->ip_tos, ip->ip_len, ip->ip_id );
printf(" %1x %04x", ((ip->ip_off)&0xe000)>>13, (ip->ip_off)&0x1fff );
printf(" %02x %02x %04x", ip->ip_ttl, ip->ip_p, ip->ip_sum );
printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_src.s_addr));
printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_dst.s_addr));
/* dump and option bytes */
while( hlen-- > 20 ) {
printf( "%02x", *cp++ );
}
printf("\n");
}
/*
* Return an ascii host address
* as a dotted quad and optionally with a hostname
*/
char *
pr_addr( l )
unsigned long l;
{
struct hostent *hp;
static char buf[80];
if( (pingflags & NUMERIC) || (hp = gethostbyaddr((char *)&l, 4, AF_INET)) == NULL )
sprintf( buf, "%s", inet_ntoa(*(struct in_addr *)&l) );
else
sprintf( buf, "%s (%s)", hp->h_name, inet_ntoa(*(struct in_addr *)&l) );
return( buf );
}
/*
* Dump some info on a returned (via ICMP) IP packet.
*/
pr_retip( ip )
struct ip *ip;
{
int hlen;
unsigned char *cp;
pr_iph( ip );
hlen = ip->ip_hl << 2;
cp = (unsigned char *)ip + hlen;
if( ip->ip_p == 6 ) {
printf( "TCP: from port %d, to port %d (decimal)\n",
(*cp*256+*(cp+1)), (*(cp+2)*256+*(cp+3)) );
} else if( ip->ip_p == 17 ) {
printf( "UDP: from port %d, to port %d (decimal)\n",
(*cp*256+*(cp+1)), (*(cp+2)*256+*(cp+3)) );
}
}
fill(bp, patp)
char *bp, *patp;
{
register int ii,jj,kk;
char *cp;
int pat[16];
for (cp=patp; *cp; cp++)
if (!isxdigit(*cp)) {
printf("\"-p %s\" ???: ", patp);
printf("patterns must be specified as hex digits\n");
exit(1);
}
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 (!(pingflags & QUIET)) {
printf("PATTERN: 0x");
for (jj=0; jj<ii; jj++)
printf("%02x", bp[jj]&0xFF);
printf("\n");
}
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.