(usagi-users 01098) Re: ioctl & ipv6

[Bhawana Bhatija <bbatija@xxxxxxxxxxx>]

Hi  YOSHIFUJI 

I am attaching the code file 
in which i creating a socket for AF_INET6
and try to get INET address for an interface (IPv6)

but every time it says invalid arguments.
Please suggest me 

Thanks
Vineet Goel



--- YOSHIFUJI Hideaki / 吉藤英明
<yoshfuji@xxxxxxxxxxxxxx> wrote: > In article
>
<20011220185949.59876.qmail@xxxxxxxxxxxxxxxxxxxxxxxxx>
> (at Thu, 20 Dec 2001 18:59:49 +0000 (GMT)), Bhawana
> Bhatija <bbatija@xxxxxxxxxxx> says:
> 
> > I am using ioctl to set system description
> (interface
> > description) using ioctl (SIOCSIFFLAGS,
> > SIOCSIFFLAGS)for IPv6. 
> 
> Isn't SIOC{G,S}IFFLAGS for setting system
> description, is it?
> 
> 
> > Porblem is when i execute my program systems goes
> > hang. I doubt that ioctl works for ipv6 atleast
> for
> > setting system values, though i am able to get
> values
> > usng ioctl.
> 
> What did you do?  minimum source code?
> 
> --yoshfuji
>  

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#include <stdio.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <netinet/in.h>

static u_char*
getAddr(const int sockfd, const char *pIfName)
{
	int i, iCount;
    int iRetval;
    struct ifconf ifc;
    struct sockaddr_in6 *addr;
    char data[1024];
    static char netip[16];
 
    ifc.ifc_len = sizeof(data);
    ifc.ifc_buf = data;
    iRetval = ioctl( sockfd, SIOCGIFCONF, &ifc );
 
    if ( iRetval < 0 )
    {
	printf("error: ioctl call fails\n");
        return NULL;
    }
 
    iCount = ifc.ifc_len / sizeof(struct ifreq);
    i = 0;
	
	while ( iCount != 0 )
    {
 
        if ( strcasecmp(pIfName, ifc.ifc_req[i].ifr_name) != 0 )
        {
            ++i;
            --iCount;
            continue;
        }
 
        iRetval = ioctl( sockfd, SIOCGIFADDR, &ifc.ifc_req[i]);
 
        if ( iRetval < 0 )
        {
			perror("SIOCGIFADDR");
            return NULL;
        }
 
        addr = (struct sockaddr_in6*)&ifc.ifc_req[i].ifr_addr;
		inet_ntop(AF_INET6, &addr->sin6_addr, netip, sizeof(struct sockaddr_in6));
 
        return netip;
 
        ++i;
        --iCount;
    }
 
    return NULL;
}


main(){
	u_char *addr;
	int indx;
	int sockfd;
	sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
	if(sockfd < 0)
	{
		printf("error:socket fails\n");
	}
		
	addr = getAddr(sockfd,"eth0" );
	printf("address is =%s\n",addr);	
}