From owner-freebsd-hackers  Mon Sep 16  7:41:57 2002
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Date: Mon, 16 Sep 2002 22:41:46 +0800
From: Leslie Jackson <int@softhome.net>
To: freebsd-hackers@freebsd.org
Subject: Re: ioctl & SIOCDIFADDR
Message-Id: <20020916224146.52e31c8c.int@softhome.net>
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	<20020916085445.GA11460@spc.org>
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On Mon, 16 Sep 2002 09:54:45 +0100
Bruce M Simpson <bms@spc.org> wrote:

> On Mon, Sep 16, 2002 at 11:43:15AM +0800, Leslie Jackson wrote:
> > I can specify an specific IP, say,  "192.168.0.2",  for SIOCDIFADDR to
> > delete. But how can i specify this "default address"(said in the
> > netintor(4)) to"delete the first address of the interface"?
> 
> Try 0.0.0.0. (aka INADDR_ANY).
> 
> BMS

Failed using that way. (SIOCDIFADDR: can't assign requested addressed)
The following is the simple code:

/*
 * 	Delete an IP address of lo0
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdio.h>

int main(void)
{
	int s;
	struct ifaliasreq ifaliasreq;
	struct sockaddr_in *in;

	s = socket(PF_INET, SOCK_STREAM, 0);
	memset(&ifaliasreq, 0, sizeof(ifaliasreq));
	strncpy(ifaliasreq.ifra_name, "lo0", sizeof(ifaliasreq.ifra_name));

	in = (struct sockaddr_in *) &ifaliasreq.ifra_addr;
	in->sin_family = AF_INET;
	in->sin_len = sizeof(ifaliasreq.ifra_addr);
	
	/* 
	 * if i use "0.0.0.0" or INADDR_ANY", i'd get this error:
	 * SIOCDIFADDR: can't assign requested addressed
	 *
	 * in->sin_addr.s_addr = htonl(INADDR_ANY);
	 * in->sin_addr.s_addr = inet_addr("0.0.0.0");
	 */
	
	/* okay if using a specific IP */
	in->sin_addr.s_addr = inet_addr("127.0.0.1"); 

	if (ioctl(s, SIOCDIFADDR, &ifaliasreq) == -1)
		perror("SIOCDIFADDR");

	return (0);
}

Something missed or wrong?
Thanks for any insights.

-- 
Leslie Jackson

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