dhcpv4: notify DHCP ACK and RELEASE via ubus

If the ubus object has any subscription notify DHCP ACK and DHCP RELEASE
events using ubus notifications.

Signed-off-by: Borja Salazar <borja.salazar@fon.com>
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

4 files changed, 43 insertions, 0 deletions

diff --git a/src/dhcpv4.c b/src/dhcpv4.c
index 166582e..c367507 100644
--- a/src/dhcpv4.c
+++ b/src/dhcpv4.c
@@ -723,6 +723,11 @@ static void handle_dhcpv4(void *addr, void *data, size_t len,
 			req->chaddr[0],req->chaddr[1],req->chaddr[2],
 			req->chaddr[3],req->chaddr[4],req->chaddr[5]);
 
+#ifdef WITH_UBUS
+	if (reqmsg == DHCPV4_MSG_RELEASE)
+		ubus_bcast_dhcp_event("dhcp.release", req->chaddr, req->hlen,
+					&req->ciaddr, hostname, iface->ifname);
+#endif
 	if (reqmsg == DHCPV4_MSG_DECLINE || reqmsg == DHCPV4_MSG_RELEASE)
 		return;
 
@@ -872,6 +877,12 @@ static void handle_dhcpv4(void *addr, void *data, size_t len,
 
 	sendto(sock, &reply, sizeof(reply), MSG_DONTWAIT,
 			(struct sockaddr*)&dest, sizeof(dest));
+
+#ifdef WITH_UBUS
+	if (msg == DHCPV4_MSG_ACK)
+		ubus_bcast_dhcp_event("dhcp.ack", req->chaddr, req->hlen, &reply.yiaddr,
+					hostname, iface->ifname);
+#endif
 }
 
 static bool dhcpv4_assign(struct interface *iface,
diff --git a/src/odhcpd.c b/src/odhcpd.c
index 13697b7..97a6de9 100644
--- a/src/odhcpd.c
+++ b/src/odhcpd.c
@@ -466,6 +466,16 @@ void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len)
 	*dst = 0;
 }
 
+const char *odhcpd_print_mac(const uint8_t *mac, const size_t len)
+{
+	static char buf[32];
+
+	snprintf(buf, sizeof(buf), "%02x", mac[0]);
+	for (size_t i = 1, j = 2; i < len && j < sizeof(buf); i++, j += 3)
+		snprintf(buf + j, sizeof(buf) - j, ":%02x", mac[i]);
+
+	return buf;
+}
 
 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits)
 {
diff --git a/src/odhcpd.h b/src/odhcpd.h
index 45badd3..fbfeb67 100644
--- a/src/odhcpd.h
+++ b/src/odhcpd.h
@@ -282,6 +282,7 @@ void odhcpd_run(void);
 time_t odhcpd_time(void);
 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
+const char *odhcpd_print_mac(const uint8_t *mac, const size_t len);
 
 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
@@ -296,6 +297,8 @@ 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
 
 int netlink_add_netevent_handler(struct netevent_handler *hdlr);
diff --git a/src/ubus.c b/src/ubus.c
index 95eeff7..19b14be 100644
--- a/src/ubus.c
+++ b/src/ubus.c
@@ -311,6 +311,25 @@ static const struct blobmsg_policy obj_attrs[OBJ_ATTR_MAX] = {
 	[OBJ_ATTR_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
 };
 
+void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac,
+		const size_t mlen, const struct in_addr *addr, const char *name,
+		const char *interface)
+{
+	if (!ubus || !main_object.has_subscribers)
+		return;
+
+	blob_buf_init(&b, 0);
+	if (mac)
+		blobmsg_add_string(&b, "mac", odhcpd_print_mac(mac, mlen));
+	if (addr)
+		blobmsg_add_string(&b, "ip", inet_ntoa(*addr));
+	if (name)
+		blobmsg_add_string(&b, "name", name);
+	if (interface)
+		blobmsg_add_string(&b, "interface", interface);
+
+	ubus_notify(ubus, &main_object, type, b.head, -1);
+}
 
 static void handle_event(_unused struct ubus_context *ctx, _unused struct ubus_event_handler *ev,
                 _unused const char *type, struct blob_attr *msg)