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> In-Reply-To: <20020916085445.GA11460@spc.org> References: <20020916114315.7feb4bac.int@softhome.net> <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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