dnsmasq: add ubus notifications for new leases

Signed-off-by: John Crispin <[email protected]>

package/network/services/dnsmasq/Makefile

@@ -37,6 +37,7 @@ define Package/dnsmasq/Default
   CATEGORY:=Base system
   TITLE:=DNS and DHCP server
   URL:=http://www.thekelleys.org.uk/dnsmasq/
+  DEPENDS:=+libubus
   USERID:=dnsmasq=453:dnsmasq=453
 endef
 
@@ -48,14 +49,14 @@ endef
 define Package/dnsmasq-dhcpv6
 $(call Package/dnsmasq/Default)
   TITLE += (with DHCPv6 support)
-  DEPENDS:=@IPV6
+  DEPENDS+=@IPV6
   VARIANT:=dhcpv6
 endef
 
 define Package/dnsmasq-full
 $(call Package/dnsmasq/Default)
   TITLE += (with DNSSEC, DHCPv6, Auth DNS, IPset, Conntrack, NO_ID enabled by default)
-  DEPENDS:=+PACKAGE_dnsmasq_full_dnssec:libnettle \
+  DEPENDS+=+PACKAGE_dnsmasq_full_dnssec:libnettle \
 	+PACKAGE_dnsmasq_full_ipset:kmod-ipt-ipset \
 	+PACKAGE_dnsmasq_full_conntrack:libnetfilter-conntrack
   VARIANT:=full
@@ -159,6 +160,8 @@ define Package/dnsmasq/install
 	$(INSTALL_DATA) ./files/rfc6761.conf $(1)/usr/share/dnsmasq/
 	$(INSTALL_DIR) $(1)/usr/lib/dnsmasq
 	$(INSTALL_BIN) ./files/dhcp-script.sh $(1)/usr/lib/dnsmasq/dhcp-script.sh
+	$(INSTALL_DIR) $(1)/usr/share/acl.d
+	$(INSTALL_DATA) ./files/dnsmasq_acl.json $(1)/usr/share/acl.d/
 endef
 
 Package/dnsmasq-dhcpv6/install = $(Package/dnsmasq/install)

package/network/services/dnsmasq/files/dnsmasq_acl.json

@@ -0,0 +1,4 @@
+{
+	"user": "dnsmasq",
+	"publish": [ "dnsmasq" ]
+}

package/network/services/dnsmasq/patches/240-ubus.patch

@@ -0,0 +1,134 @@
+Index: dnsmasq-2.77/src/dnsmasq.c
+===================================================================
+--- dnsmasq-2.77.orig/src/dnsmasq.c
++++ dnsmasq-2.77/src/dnsmasq.c
+@@ -17,6 +17,8 @@
+ /* Declare static char *compiler_opts  in config.h */
+ #define DNSMASQ_COMPILE_OPTS
+ 
++#include <libubus.h>
++
+ #include "dnsmasq.h"
+ 
+ struct daemon *daemon;
+@@ -32,6 +34,62 @@ static void fatal_event(struct event_des
+ static int read_event(int fd, struct event_desc *evp, char **msg);
+ static void poll_resolv(int force, int do_reload, time_t now);
+ 
++static struct ubus_context *ubus;
++static struct blob_buf b;
++
++static struct ubus_object_type ubus_object_type = {
++	.name = "dnsmasq",
++};
++
++static struct ubus_object ubus_object = {
++	.name = "dnsmasq",
++	.type = &ubus_object_type,
++};
++
++void ubus_event_bcast(const char *type, const char *mac, const char *ip, const char *name)
++{
++	if (!ubus || !ubus_object.has_subscribers)
++		return;
++
++	blob_buf_init(&b, 0);
++	if (mac)
++		blobmsg_add_string(&b, "mac", mac);
++	if (ip)
++		blobmsg_add_string(&b, "ip", ip);
++	if (name)
++		blobmsg_add_string(&b, "name", name);
++	ubus_notify(ubus, &ubus_object, type, b.head, -1);
++}
++
++static void set_ubus_listeners(void)
++{
++	if (!ubus)
++		return;
++
++	poll_listen(ubus->sock.fd, POLLIN);
++	poll_listen(ubus->sock.fd, POLLERR);
++	poll_listen(ubus->sock.fd, POLLHUP);
++}
++
++static void check_ubus_listeners()
++{
++	if (!ubus) {
++		ubus = ubus_connect(NULL);
++		if (ubus)
++			ubus_add_object(ubus, &ubus_object);
++		else
++			return;
++	}
++
++	if (poll_check(ubus->sock.fd, POLLIN))
++		ubus_handle_event(ubus);
++
++	if (poll_check(ubus->sock.fd, POLLHUP)) {
++		ubus_free(ubus);
++		ubus = NULL;
++	}
++}
++
+ int main (int argc, char **argv)
+ {
+   int bind_fallback = 0;
+@@ -911,6 +969,7 @@ int main (int argc, char **argv)
+       set_dbus_listeners();
+ #endif	
+   
++      set_ubus_listeners();
+ #ifdef HAVE_DHCP
+       if (daemon->dhcp || daemon->relay4)
+ 	{
+@@ -1041,6 +1100,8 @@ int main (int argc, char **argv)
+       check_dbus_listeners();
+ #endif
+       
++      check_ubus_listeners();
++
+       check_dns_listeners(now);
+ 
+ #ifdef HAVE_TFTP
+Index: dnsmasq-2.77/Makefile
+===================================================================
+--- dnsmasq-2.77.orig/Makefile
++++ dnsmasq-2.77/Makefile
+@@ -85,7 +85,7 @@ all : $(BUILDDIR)
+ 	@cd $(BUILDDIR) && $(MAKE) \
+  top="$(top)" \
+  build_cflags="$(version) $(dbus_cflags) $(idn2_cflags) $(idn_cflags) $(ct_cflags) $(lua_cflags) $(nettle_cflags)" \
+- build_libs="$(dbus_libs) $(idn2_libs) $(idn_libs) $(ct_libs) $(lua_libs) $(sunos_libs) $(nettle_libs) $(gmp_libs)" \
++ build_libs="$(dbus_libs) $(idn2_libs) $(idn_libs) $(ct_libs) $(lua_libs) $(sunos_libs) $(nettle_libs) $(gmp_libs) -lubox -lubus" \
+  -f $(top)/Makefile dnsmasq 
+ 
+ mostly_clean :
+Index: dnsmasq-2.77/src/dnsmasq.h
+===================================================================
+--- dnsmasq-2.77.orig/src/dnsmasq.h
++++ dnsmasq-2.77/src/dnsmasq.h
+@@ -1389,6 +1389,8 @@ void emit_dbus_signal(int action, struct
+ #  endif
+ #endif
+ 
++void ubus_event_bcast(const char *type, const char *mac, const char *ip, const char *name);
++
+ /* ipset.c */
+ #ifdef HAVE_IPSET
+ void ipset_init(void);
+Index: dnsmasq-2.77/src/rfc2131.c
+===================================================================
+--- dnsmasq-2.77.orig/src/rfc2131.c
++++ dnsmasq-2.77/src/rfc2131.c
+@@ -1621,6 +1621,10 @@ static void log_packet(char *type, void
+ 	      daemon->namebuff,
+ 	      string ? string : "",
+ 	      err ? err : "");
++  if (!strcmp(type, "DHCPACK"))
++	  ubus_event_bcast("dhcp.ack", addr ? inet_ntoa(a) : NULL, daemon->namebuff, string ? string : NULL);
++  else if (!strcmp(type, "DHCPRELEASE"))
++	  ubus_event_bcast("dhcp.release", addr ? inet_ntoa(a) : NULL, daemon->namebuff, string ? string : NULL);
+ }
+ 
+ static void log_options(unsigned char *start, u32 xid)