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From: Nate Lawson <nate@almond.elite.net>
Message-Id: <199806250040.RAA05172@almond.elite.net>
Subject: Apparent bug in sendto() with raw sockets
To: freebsd-bugs@FreeBSD.ORG, freebsd-net@FreeBSD.ORG
Date: Wed, 24 Jun 1998 17:40:43 -0700 (PDT)
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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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