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When a timeval is stored at the beginning of icmp_data, the fields

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are unaligned for access by the alpha, so copy the value to a variable
that is aligned.

When checking the returned data, be careful to avoid confusing the
size of the icmp header with the size of a timeval. On i386 these
are both 8, but on alpha, a timeval is 16 bytes. This means that
a packet sent from an alpha contains 48 bytes of data, not 56 like
on i386.
This commit is contained in:
John Birrell 1998-05-16 00:19:27 +00:00
parent a9352e90f0
commit d32ff0376f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=36089
1 changed files with 27 additions and 14 deletions
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41
sbin/ping/ping.c
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@ -45,7 +45,7 @@ static const char copyright[] =
static char sccsid[] = "@(#)ping.c 8.1 (Berkeley) 6/5/93";
*/
static const char rcsid[] =
"$Id: ping.c,v 1.32 1998/04/02 04:33:18 imp Exp $";
"$Id: ping.c,v 1.33 1998/04/15 19:55:14 phk Exp $";
#endif /* not lint */
/*
@ -92,7 +92,8 @@ static const char rcsid[] =
#include <netinet/ip_var.h>
#include <arpa/inet.h>
#define DEFDATALEN (64 - 8) /* default data length */
#define PHDR_LEN sizeof(struct timeval)
#define DEFDATALEN (64 - PHDR_LEN) /* default data length */
#define FLOOD_BACKOFF 20000 /* usecs to back off if F_FLOOD mode */
/* runs out of buffer space */
#define MAXIPLEN 60
@ -212,7 +213,7 @@ main(argc, argv)
preload = 0;
datap = &outpack[8 + sizeof(struct timeval)];
datap = &outpack[8 + PHDR_LEN];
while ((ch = getopt(argc, argv, "I:LQRT:c:adfi:l:np:qrs:v")) != -1) {
switch(ch) {
case 'a':
@ -349,14 +350,14 @@ main(argc, argv)
errx(EX_USAGE,
"-I, -L, -T flags cannot be used with unicast destination");
if (datalen >= sizeof(struct timeval)) /* can we time transfer */
if (datalen >= PHDR_LEN) /* can we time transfer */
timing = 1;
packlen = datalen + MAXIPLEN + MAXICMPLEN;
if (!(packet = (u_char *)malloc((size_t)packlen)))
err(EX_UNAVAILABLE, "malloc");
if (!(options & F_PINGFILLED))
for (i = 8; i < datalen; ++i)
for (i = PHDR_LEN; i < datalen; ++i)
*datap++ = i;
ident = getpid() & 0xFFFF;
@ -575,7 +576,7 @@ pinger(void)
(void)gettimeofday((struct timeval *)&outpack[8],
(struct timezone *)NULL);
cc = datalen + 8; /* skips ICMP portion */
cc = datalen + PHDR_LEN; /* skips ICMP portion */
/* compute ICMP checksum here */
icp->icmp_cksum = in_cksum((u_short *)icp, cc);
@ -645,12 +646,15 @@ pr_pack(buf, cc, from)
++nreceived;
triptime = 0.0;
if (timing) {
struct timeval tv1;
#ifndef icmp_data
tp = (struct timeval *)&icp->icmp_ip;
#else
tp = (struct timeval *)icp->icmp_data;
#endif
tvsub(&tv, tp);
/* Avoid unaligned data: */
memcpy(&tv1,tp,sizeof(tv1));
tvsub(&tv, &tv1);
triptime = ((double)tv.tv_sec) * 1000.0 +
((double)tv.tv_usec) / 1000.0;
tsum += triptime;
@ -687,14 +691,22 @@ pr_pack(buf, cc, from)
if (options & F_AUDIBLE)
(void)printf("\a");
/* check the data */
cp = (u_char*)&icp->icmp_data[8];
dp = &outpack[8 + sizeof(struct timeval)];
for (i = 8; i < datalen; ++i, ++cp, ++dp) {
cp = (u_char*)&icp->icmp_data[PHDR_LEN];
dp = &outpack[8 + PHDR_LEN];
for (i = PHDR_LEN; i < datalen; ++i, ++cp, ++dp) {
if (*cp != *dp) {
(void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x",
i, *dp, *cp);
printf("\ncp:");
cp = (u_char*)&icp->icmp_data[0];
for (i = 8; i < datalen; ++i, ++cp) {
for (i = 0; i < datalen; ++i, ++cp) {
if ((i % 32) == 8)
(void)printf("\n\t");
(void)printf("%x ", *cp);
}
printf("\ndp:");
cp = &outpack[8];
for (i = 0; i < datalen; ++i, ++cp) {
if ((i % 32) == 8)
(void)printf("\n\t");
(void)printf("%x ", *cp);
@ -1138,8 +1150,9 @@ pr_iph(ip)
(void)printf(" %1x %1x %02x %04x %04x",
ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_len),
ntohs(ip->ip_id));
(void)printf(" %1lx %04lx", (ntohl(ip->ip_off) & 0xe000) >> 13,
ntohl(ip->ip_off) & 0x1fff);
(void)printf(" %1lx %04lx",
(u_long) (ntohl(ip->ip_off) & 0xe000) >> 13,
(u_long) ntohl(ip->ip_off) & 0x1fff);
(void)printf(" %02x %02x %04x", ip->ip_ttl, ip->ip_p,
ntohs(ip->ip_sum));
(void)printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_src.s_addr));
@ -1217,7 +1230,7 @@ fill(bp, patp)
if (ii > 0)
for (kk = 0;
kk <= MAXPACKET - (8 + sizeof(struct timeval) + ii);
kk <= MAXPACKET - (8 + PHDR_LEN + ii);
kk += ii)
for (jj = 0; jj < ii; ++jj)
bp[jj + kk] = pat[jj];