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Don't forget to update the UDP length when changing the packet length. 

Reported by Johan Danielsson in PR 7781; the fix is an updated version
(by the same person) of the patch in the PR.
This commit is contained in:
is 1999-06-16 13:52:58 +00:00
parent 6f6fd8467a
commit a11ec6ccb8
1 changed files with 8 additions and 2 deletions
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10
usr.sbin/traceroute/traceroute.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: traceroute.c,v 1.32 1999/06/16 13:26:16 is Exp $ */
/* $NetBSD: traceroute.c,v 1.33 1999/06/16 13:52:58 is Exp $ */
/*
* Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997
@ -29,7 +29,7 @@ static const char rcsid[] =
#else
__COPYRIGHT("@(#) Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997\n\
The Regents of the University of California. All rights reserved.\n");
__RCSID("$NetBSD: traceroute.c,v 1.32 1999/06/16 13:26:16 is Exp $");
__RCSID("$NetBSD: traceroute.c,v 1.33 1999/06/16 13:52:58 is Exp $");
#endif
#endif
@ -1101,6 +1101,8 @@ again:
if (errno == EMSGSIZE) {
packlen = *mtuptr++;
outudp->uh_ulen =
htons((u_short)(packlen - (sizeof(*outip) + optlen)));
#ifdef _NoLongerLooksUgly_
Printf("message too big, "
"trying new MTU = %d\n", packlen);
@ -1481,6 +1483,8 @@ frag_err()
",
nextmtu);
packlen = nextmtu;
outudp->uh_ulen =
htons((u_short)(packlen - (sizeof(*outip) + optlen)));
for (i = 0; mtus[i] > 0; i++) {
if (mtus[i] < nextmtu) {
mtuptr = &mtus[i]; /* next one to try */
@ -1489,6 +1493,8 @@ frag_err()
}
} else {
packlen = *mtuptr++;
outudp->uh_ulen =
htons((u_short)(packlen - (sizeof(*outip) + optlen)));
Printf("fragmentation required and DF set, "
"trying new MTU = %d\n", packlen);
}