odhcpd: reduce use of WITH_UBUS defines in code

By defining some dummy functions in the header file, we can avoid sprinkling
WITH_UBUS defines through the code, which helps readability and also ensures
that compilation errors (e.g. when a variable is renamed) is caught in builds
with and without ubus.

Signed-off-by: David Härdeman <david@hardeman.nu>
Link: https://github.com/openwrt/odhcpd/pull/270/
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

3 files changed, 24 insertions, 13 deletions

diff --git a/src/config.c b/src/config.c
index 46b7363..0dcef1b 100644
--- a/src/config.c
+++ b/src/config.c
@@ -2100,9 +2100,7 @@ void odhcpd_reload(void)
 
 	vlist_flush(&leases);
 
-#ifdef WITH_UBUS
 	ubus_apply_network();
-#endif
 
 	bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 
@@ -2210,10 +2208,8 @@ void odhcpd_run(void)
 	signal(SIGINT, handle_signal);
 	signal(SIGHUP, handle_signal);
 
-#ifdef WITH_UBUS
 	while (ubus_init())
 		sleep(1);
-#endif
 
 	odhcpd_reload();
 	uloop_run();
diff --git a/src/dhcpv4.c b/src/dhcpv4.c
index 9caf35e..8b6a0ce 100644
--- a/src/dhcpv4.c
+++ b/src/dhcpv4.c
@@ -703,13 +703,11 @@ void dhcpv4_handle_msg(void *addr, void *data, size_t len,
 	syslog(LOG_INFO, "Received %s from %s on %s", dhcpv4_msg_to_string(reqmsg),
 			odhcpd_print_mac(req->chaddr, req->hlen), iface->name);
 
-#ifdef WITH_UBUS
 	if (reqmsg == DHCPV4_MSG_RELEASE) {
 		struct in_addr ciaddr = req->ciaddr; // ensure pointer alignment
 		ubus_bcast_dhcp_event("dhcp.release", req->chaddr, req->hlen,
-					&ciaddr, a ? a->hostname : NULL, iface->ifname);
+				      &ciaddr, a ? a->hostname : NULL, iface->ifname);
 	}
-#endif
 
 	if (reqmsg == DHCPV4_MSG_DECLINE || reqmsg == DHCPV4_MSG_RELEASE)
 		return;
@@ -933,13 +931,11 @@ void dhcpv4_handle_msg(void *addr, void *data, size_t len,
 			"ff:ff:ff:ff:ff:ff": odhcpd_print_mac(req->chaddr, req->hlen),
 			inet_ntoa(dest.sin_addr));
 
-#ifdef WITH_UBUS
 	if (msg == DHCPV4_MSG_ACK) {
 		struct in_addr yiaddr = reply.yiaddr; // ensure pointer alignment
 		ubus_bcast_dhcp_event("dhcp.ack", req->chaddr, req->hlen, &yiaddr,
-					a ? a->hostname : NULL, iface->ifname);
+				      a ? a->hostname : NULL, iface->ifname);
 	}
-#endif
 }
 
 /* Handler for DHCPv4 messages */
diff --git a/src/odhcpd.h b/src/odhcpd.h
index 4f88727..7244274 100644
--- a/src/odhcpd.h
+++ b/src/odhcpd.h
@@ -519,9 +519,28 @@ int ubus_init(void);
 const char* ubus_get_ifname(const char *name);
 void ubus_apply_network(void);
 bool ubus_has_prefix(const char *name, const char *ifname);
-void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac, const size_t mac_len,
-		const struct in_addr *addr, const char *name, const char *interface);
-#endif
+void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac,
+			   const size_t mac_len, const struct in_addr *addr,
+			   const char *name, const char *interface);
+#else
+static inline int ubus_init(void)
+{
+	return 0;
+}
+
+static inline void ubus_apply_network(void)
+{
+	return;
+}
+
+static inline
+void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac,
+			   const size_t mac_len, const struct in_addr *addr,
+			   const char *name, const char *interface)
+{
+	return;
+}
+#endif /* WITH_UBUS */
 
 ssize_t dhcpv6_ia_handle_IAs(uint8_t *buf, size_t buflen, struct interface *iface,
 		const struct sockaddr_in6 *addr, const void *data, const uint8_t *end);