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Move handling of address/netmask pairs from ifquery into library.

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Signed-off-by: Maximilian Wilhelm <max@sdn.clinic>
This commit is contained in:
Maximilian Wilhelm 2020-10-14 01:23:23 +02:00
parent 17a410b87c
commit 02324bebd5
3 changed files with 56 additions and 45 deletions
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51
libifupdown/interface.c
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@ -58,6 +58,57 @@ lif_address_unparse(const struct lif_address *address, char *buf, size_t buflen,
return true;
}
static inline size_t
count_set_bits(const char *netmask)
{
/* netmask set to CIDR length */
if (strchr(netmask, '.') == NULL)
return strtol(netmask, NULL, 10);
size_t r = 0;
struct in_addr in;
if (inet_pton(AF_INET, netmask, &in) == 0)
return r;
/* take the IP, put it in host endian order, and
* flip it so that all the set bits are set to the right.
* then we can simply count down from 32 and right-shift
* until the bit field is all zero.
*/
unsigned int bits = htonl(in.s_addr);
for (bits = ~bits, r = 32; bits; bits >>= 1, r--)
;
return r;
}
bool
lif_address_format_cidr(struct lif_interface *iface, struct lif_dict_entry *entry, char *buf, size_t buflen)
{
struct lif_address *addr = entry->data;
size_t orig_netmask = addr->netmask;
if (!addr->netmask)
{
/* if netmask is not set, default to 255.255.255.0, ifupdown does so too */
addr->netmask = 24;
struct lif_dict_entry *entry = lif_dict_find(&iface->vars, "netmask");
if (entry != NULL)
addr->netmask = count_set_bits(entry->data);
}
if (!lif_address_unparse(addr, buf, buflen, true))
{
addr->netmask = orig_netmask;
return false;
}
addr->netmask = orig_netmask;
return true;
}
void
lif_interface_init(struct lif_interface *interface, const char *ifname)
{