treewide: rework IPv4 address logic

Align IPv4 address logic with IPv6 by caching per interface the assigned
IPv4 addresses. This allows to get rid of different ioctl calls in the
DHCPv4 logic to retrieve the IPv4 address and netmask in use by an
interface.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/config.c b/src/config.c
index 19b901c..8bf2011 100644
--- a/src/config.c
+++ b/src/config.c
@@ -240,6 +240,7 @@ static void close_interface(struct interface *iface)
 	setup_dhcpv4_interface(iface, false);
 
 	clean_interface(iface);
+	free(iface->addr4);
 	free(iface->ia_addr);
 	free(iface->ifname);
 	free(iface);
@@ -450,6 +451,11 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr
 
 		if (len > 0)
 			iface->ia_addr_len = len;
+
+		len = odhcpd_get_interface_addresses(iface->ifindex,
+						false, &iface->addr4);
+		if (len > 0)
+			iface->addr4_len = len;
 	}
 
 	iface->inuse = true;