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Better fix for the traceroute flood bug.

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Submitted by:	bde
This commit is contained in:
Dag-Erling Smørgrav 1999-02-16 14:19:50 +00:00
parent b6478cfe85
commit 424a49ef3f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=44086
1 changed files with 16 additions and 7 deletions
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23
contrib/traceroute/traceroute.c
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@ -24,7 +24,7 @@ static const char copyright[] =
"@(#) Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996\n\
The Regents of the University of California. All rights reserved.\n";
static const char rcsid[] =
"@(#)$Header: /home/ncvs/src/contrib/traceroute/traceroute.c,v 1.6 1998/06/06 23:33:28 jb Exp $ (LBL)";
"@(#)$Header: /home/ncvs/src/contrib/traceroute/traceroute.c,v 1.7 1999/02/15 08:11:44 des Exp $ (LBL)";
#endif
/*
@ -416,8 +416,9 @@ main(int argc, char **argv)
case 'w':
waittime = atoi(optarg);
if (waittime <= 1) {
Fprintf(stderr, "%s: wait must be > 1 sec\n",
if (waittime <= 1 || waittime >= 24L * 60 * 60) {
Fprintf(stderr,
"%s: wait must be > 1 sec and < 1 day\n",
prog);
exit(1);
}
@ -724,6 +725,7 @@ wait_for_reply(register int sock, register struct sockaddr_in *fromp,
struct timeval now, wait;
struct timezone tz;
register int cc = 0;
register int error;
int fromlen = sizeof(*fromp);
FD_ZERO(&fds);
@ -732,11 +734,18 @@ wait_for_reply(register int sock, register struct sockaddr_in *fromp,
wait.tv_sec = tp->tv_sec + waittime;
wait.tv_usec = tp->tv_usec;
(void)gettimeofday(&now, &tz);
if (wait.tv_sec < now.tv_sec + 1)
wait.tv_sec = now.tv_sec + 1;
tvsub(&wait, &now);
if (wait.tv_sec < 0) {
wait.tv_sec = 0;
wait.tv_usec = 1;
}
if (select(sock + 1, &fds, (fd_set *)0, (fd_set *)0, &wait) > 0)
error = select(sock + 1, &fds, (fd_set *)0, (fd_set *)0, &wait);
if (error == -1 && errno == EINVAL) {
Fprintf(stderr, "%s: botched select() args\n", prog);
exit(1);
}
if (error > 0)
cc = recvfrom(s, (char *)packet, sizeof(packet), 0,
(struct sockaddr *)fromp, &fromlen);
@ -914,7 +923,7 @@ in_cksum(register u_short *addr, register int len)
/*
* Subtract 2 timeval structs: out = out - in.
* Out is assumed to be >= in.
* Out is assumed to be within about LONG_MAX seconds of in.
*/
void
tvsub(register struct timeval *out, register struct timeval *in)