/**************************************************************************** get the broadcast address for our address ([email protected]) ****************************************************************************/ static void get_broadcast (struct in_addr *if_ipaddr, struct in_addr *if_bcast, struct in_addr *if_nmask) { uint32 nm; short onbc; short offbc; /* get a default netmask and broadcast */ default_netmask (if_nmask, if_ipaddr); get_netmask (if_ipaddr, if_nmask); /* sanity check on the netmask */ nm = ntohl (if_nmask->s_addr); onbc = 0; offbc = 0; while ((onbc + offbc) < 32) { if (nm & 0x80000000) { onbc++; if (offbc) { /* already found an off bit, so mask is wrong */ onbc = 34; } } else { offbc++; } nm <<= 1; } if ((onbc < 8) || (onbc == 34)) { DEBUG (0, ("Impossible netmask %s - using defaults\n", inet_ntoa (*if_nmask))); default_netmask (if_nmask, if_ipaddr); } /* derive the broadcast assuming a 1's broadcast, as this is what all MS operating systems do, we have to comply even if the unix box is setup differently */ if_bcast->s_addr = MKBCADDR (if_ipaddr->s_addr, if_nmask->s_addr); DEBUG (4, ("Derived broadcast address %s\n", inet_ntoa (*if_bcast))); }
static inline unsigned long guess_mask(unsigned long dst, struct net_device *dev)
{
unsigned long mask;
if(!dst)
return 0;
mask = default_netmask(dst);
if((dst ^ dev->pa_addr) & mask)
return mask;
return dev->pa_mask;
}
int
ifconfig (char *ip, char *sm, char *gw, char *svr)
{
in_addr tmp;
if (sm)
{
if (! inet_aton (sm, &tmp))
return 0;
netmask = tmp.s_addr;
}
if (ip)
{
if (! inet_aton (ip, &arptable[ARP_CLIENT].ipaddr))
return 0;
if (! netmask && ! sm)
netmask = default_netmask ();
}
if (gw && ! inet_aton (gw, &arptable[ARP_GATEWAY].ipaddr))
return 0;
grub_memset (arptable[ARP_GATEWAY].node, 0, ETH_ALEN);
if (svr && ! inet_aton (svr, &arptable[ARP_SERVER].ipaddr))
return 0;
grub_memset (arptable[ARP_SERVER].node, 0, ETH_ALEN);
if (ip || sm)
{
if (IP_BROADCAST == (netmask | arptable[ARP_CLIENT].ipaddr.s_addr)
|| netmask == (netmask | arptable[ARP_CLIENT].ipaddr.s_addr)
|| ! netmask)
network_ready = 0;
else
network_ready = 1;
}
return 1;
}
/****************************************************************************
load a list of network interfaces
****************************************************************************/
static void
interpret_interfaces (char *s, struct interface **interfaces, const char *description)
{
char *ptr;
fstring token;
struct interface *iface;
struct in_addr ip;
ptr = s;
ipzero = *interpret_addr2 ("0.0.0.0");
allones_ip = *interpret_addr2 ("255.255.255.255");
loopback_ip = *interpret_addr2 ("127.0.0.1");
while (next_token (&ptr, token, NULL, sizeof (token)))
{
/* parse it into an IP address/netmasklength pair */
char *p = strchr (token, '/');
if (p)
*p++ = 0;
ip = *interpret_addr2 (token);
/* maybe we already have it listed */
{
struct interface *i;
for (i = (*interfaces); i; i = i->next)
if (ip_equal (ip, i->ip))
break;
if (i)
continue;
}
iface = (struct interface *) malloc (sizeof (*iface));
if (!iface)
return;
iface->ip = ip;
if (p)
{
if (strlen (p) > 2)
iface->nmask = *interpret_addr2 (p);
else
iface->nmask.s_addr = htonl (((ALLONES >> atoi (p)) ^ ALLONES));
}
else
{
default_netmask (&iface->nmask, &iface->ip);
}
iface->bcast.s_addr = MKBCADDR (iface->ip.s_addr, iface->nmask.s_addr);
iface->next = NULL;
if (!(*interfaces))
{
(*interfaces) = iface;
}
else
{
last_iface->next = iface;
}
last_iface = iface;
DEBUG (2, ("Added %s ip=%s ", description, inet_ntoa (iface->ip)));
DEBUG (2, ("bcast=%s ", inet_ntoa (iface->bcast)));
DEBUG (2, ("nmask=%s\n", inet_ntoa (iface->nmask)));
}
