odhcp6c: add failure when -E option is used without ubus support enabled

Problem: The -E option disables the state script and relies only on ubus
to emit events on state changes. But if odhcp6c is compiled without ubus
support (ENABLE_UBUS flag omitted), odhcp6c has no way to signal state
changes.

Solution: Return an error when -E flag is used and ubus support is
absent.

Signed-off-by: Nicolas BESNARD <nico.besnard31@gmail.com>
Signed-off-by: Paul Donald <newtwen+github@gmail.com>
Link: https://github.com/openwrt/odhcp6c/pull/106
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

diff --git a/src/odhcp6c.c b/src/odhcp6c.c
index e784b5637e4cd712cab4d99b4d3263404dcc8c84..c36e3e30995f1ffe9efcc2e8cb2e858c55e27097 100644 (file)
--- a/src/odhcp6c.c
+++ b/src/odhcp6c.c
@@ -347,6 +347,10 @@ int main(_unused int argc, char* const argv[])
                        break;
 
                case 'E':
+#ifndef WITH_UBUS
+                       syslog(LOG_ERR, "Failed to use ubus event: ENABLE_UBUS compilation flag missing");
+                       return 1;
+#endif /* WITH_UBUS */
                        script = NULL;
                        break;