[PATCH 7/8] treewide: Avoid in_addr_t

[David Gibson <david@gibson.dropbear.id.au>]

IPv4 addresses can be stored in an in_addr_t or a struct in_addr.  The
former is just a type alias to a 32-bit integer, so doesn't really give us
any type checking.  Therefore we generally prefer the structure, since we
mostly want to treat IP address as opaque objects.  Fix a few places where
we still use in_addr_t, but can just as easily use struct in_addr.

Note there are still some uses of in_addr_t in conf.c, but those are
justified: since they're doing prefix calculations, they actually need to
look at the internals of the address as an integer.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 udp.c  | 4 ++--
 util.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/udp.c b/udp.c
index 489a843..f6e8b37 100644
--- a/udp.c
+++ b/udp.c
@@ -866,8 +866,8 @@ int udp_tap_handler(struct ctx *c, uint8_t pif,
 		debug("UDP from tap src=%hu dst=%hu, s=%d",
 		      src, dst, udp_tap_map[V4][src].sock);
 		if ((s = udp_tap_map[V4][src].sock) < 0) {
+			struct in_addr bind_addr = IN4ADDR_ANY_INIT;
 			union udp_epoll_ref uref = { .port = src };
-			in_addr_t bind_addr = { 0 };
 			const char *bind_if = NULL;
 
 			if (!IN6_IS_ADDR_LOOPBACK(&s_in.sin_addr) &&
@@ -876,7 +876,7 @@ int udp_tap_handler(struct ctx *c, uint8_t pif,
 
 			if (!IN4_IS_ADDR_UNSPECIFIED(&c->ip4.addr_out) &&
 			    !IN4_IS_ADDR_LOOPBACK(&s_in.sin_addr))
-				bind_addr = c->ip4.addr_out.s_addr;
+				bind_addr = c->ip4.addr_out;
 
 			s = sock_l4(c, AF_INET, IPPROTO_UDP, &bind_addr,
 				    bind_if, src, uref.u32);
diff --git a/util.c b/util.c
index 0152ae6..4de7b96 100644
--- a/util.c
+++ b/util.c
@@ -161,7 +161,7 @@ int sock_l4(const struct ctx *c, int af, uint8_t proto,
 
 	if (af == AF_INET) {
 		if (bind_addr)
-			addr4.sin_addr.s_addr = *(in_addr_t *)bind_addr;
+			addr4.sin_addr = *(struct in_addr *)bind_addr;
 
 		sa = (const struct sockaddr *)&addr4;
 		sl = sizeof(addr4);
-- 
@@ -161,7 +161,7 @@ int sock_l4(const struct ctx *c, int af, uint8_t proto,
 
 	if (af == AF_INET) {
 		if (bind_addr)
-			addr4.sin_addr.s_addr = *(in_addr_t *)bind_addr;
+			addr4.sin_addr = *(struct in_addr *)bind_addr;
 
 		sa = (const struct sockaddr *)&addr4;
 		sl = sizeof(addr4);
-- 
2.43.0