Date: Sun, 24 Jun 2001 21:56:31 -0700 From: "Crist J. Clark" <cristjc@earthlink.net> To: freebsd-questions@freebsd.org Subject: How Long hping2 Been Broken? Message-ID: <20010624215631.K11961@blossom.cjclark.org>
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I just re-installed hping2 on a system and found out it is broken. It
uses atoi(3) to get things like sequence and acknowledgement
numbers. These are usually written as unsigned integers. But if I do,
# hping -R -M 3413718705 -c 1 216.136.204.21
I see in tcpdump(8),
21:48:53.007550 209.247.139.131.13811 > 216.136.204.21.0: R 2147483647:2147483647(0) win 512
Where we see the sequence number has become 2147483647
(0x7fffffff). This indicates an overflow.
Try the simple C program,
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
int main(int argc, char *argv[])
{
int a;
a = atoi(argv[1]);
printf("a = %d\nerrno = %d\n",a,errno);
return 0;
}
And,
$ cc -o atoi_test atoi_test.c
$ ./atoi_test 3413718705
a = 2147483647
errno = 34
Which is exactly what I expect.
I read the docs saying that's how atoi(3) should work. But I swear
that hping2 used to work. Didn't it?
--
Crist J. Clark cjclark@alum.mit.edu
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