Date: Wed, 24 Jun 1998 17:40:43 -0700 (PDT) From: Nate Lawson <nate@almond.elite.net> To: freebsd-bugs@FreeBSD.ORG, freebsd-net@FreeBSD.ORG Subject: Apparent bug in sendto() with raw sockets Message-ID: <199806250040.RAA05172@almond.elite.net>
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I had some code that opens a raw socket and sends packets. It worked on 2.0.5
and I recently had to dust it off. To my surprise, the same code (recompiled,
of course) now gets "Invalid argument" in the sendto() call on 2.2.5.
I stripped out all irrelevant code, and came up with the code fragment below.
It works on: OpenBSD 2.4, Linux 2.0.something
It fails on: FreeBSD 2.2.5, 2.2.6, 3.0-current
The error is always EINVAL in sendto().
Answers?
Thanks,
Nate
/* Cut here for sample code */
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
main ()
{
static struct sockaddr sa;
int fd;
int on=1;
struct sockaddr_in *p;
u_char buf[] = { 0x45, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0xa, 0x2, 0x2, 0x2, 0xa, 0x1, 0x1, 0x1 };
p = (struct sockaddr_in*)&sa;
p->sin_family = AF_INET;
p->sin_addr.s_addr = inet_addr ("10.1.1.1");
if ((fd = socket (AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) {
perror("socket");
exit(1);
}
if (setsockopt (fd, IPPROTO_IP, IP_HDRINCL, &on, sizeof(on)) < 0) {
perror("setsockopt IP_HDRINCL");
exit(1);
}
if (sendto (fd, buf, sizeof(buf), 0, &sa, sizeof(sa)) < 0) {
perror("sendto");
exit(1);
}
fprintf (stderr, "Success.\n");
exit(0);
}
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