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Message-ID: <20140408125438.GN3034@port70.net>
Date: Tue, 8 Apr 2014 14:54:38 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: if_nameindex/getifaddrs and dhcpcd issue
* Justin Cormack <justin@...cialbusservice.com> [2014-04-08 11:07:47 +0100]:
> I am not sure that it is appropriate that a netlink implementation,
> which is the only way to do the enumeration correctly in the potential
> absense of /proc, should go into Musl. I would be more inclined to
one could just try all the numbers.. this "works" even at boot time :)
(and there is /sys/class/net/*/ifindex but that does not help libc)
#include <net/if.h>
#include <stdlib.h>
#include <errno.h>
#define N 256
struct if_nameindex *if_nameindex()
{
struct if_nameindex *p = malloc(N*sizeof*p + N*IF_NAMESIZE);
if (!p) errno = ENOBUFS;
else {
char (*name)[IF_NAMESIZE] = (void*)(p+N);
int i,j;
for (i=1,j=0; i<N; i++)
if (if_indextoname(i, name[j])) {
p[j].if_name = name[j];
p[j].if_index = i;
j++;
}
p[j].if_name = 0;
p[j].if_index = 0;
}
return p;
}
> However I can see no reason why dhcp on a specified interface needs to
> enumerate interfaces at all, and it only needs to read ipv4 addresses,
> unless it is implementing dhcp6 too, maybe it does now. Again dhcp6
> needs netlink, the Musl ipv6 parts for getifaddrs already use /proc
> which is definitely unreliable for early boot config in a distro in my
> view.
if ipv6 things require netlink anyway then probably musl does not have
much choice..
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