rename interface-hotplug.c to interface-event.c

1 files changed, 105 insertions, 0 deletions

diff --git a/interface-event.c b/interface-event.c
new file mode 100644
index 0000000..ba7405a
--- /dev/null
+++ b/interface-event.c
@@ -0,0 +1,105 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <libubox/uloop.h>
+
+#include "netifd.h"
+#include "interface.h"
+
+char *hotplug_cmd_path = DEFAULT_HOTPLUG_PATH;
+static struct interface *current;
+static enum interface_event current_ev;
+static struct list_head pending = LIST_HEAD_INIT(pending);
+
+static void task_complete(struct uloop_process *proc, int ret);
+static struct uloop_process task = {
+	.cb = task_complete,
+};
+
+static void
+run_cmd(const char *ifname, bool up)
+{
+	char *argv[3];
+	int pid;
+
+	pid = fork();
+	if (pid < 0)
+		return task_complete(NULL, -1);
+
+	if (pid > 0) {
+		task.pid = pid;
+		uloop_process_add(&task);
+		return;
+	}
+
+	setenv("ACTION", up ? "ifup" : "ifdown", 1);
+	setenv("INTERFACE", ifname, 1);
+	argv[0] = hotplug_cmd_path;
+	argv[1] = "network";
+	argv[2] = NULL;
+	execvp(argv[0], argv);
+	exit(127);
+}
+
+static void
+call_hotplug(void)
+{
+	if (list_empty(&pending))
+		return;
+
+	current = list_first_entry(&pending, struct interface, hotplug_list);
+	current_ev = current->hotplug_ev;
+	list_del_init(&current->hotplug_list);
+
+	D(SYSTEM, "Call hotplug handler for interface '%s'\n", current->name);
+	run_cmd(current->name, current_ev == IFEV_UP);
+}
+
+static void
+task_complete(struct uloop_process *proc, int ret)
+{
+	if (current)
+		D(SYSTEM, "Complete hotplug handler for interface '%s'\n", current->name);
+	current = NULL;
+	call_hotplug();
+}
+
+/*
+ * Queue an interface for an up/down event.
+ * An interface can only have one event in the queue and one
+ * event waiting for completion.
+ * When queueing an event that is the same as the one waiting for
+ * completion, remove the interface from the queue
+ */
+void
+interface_queue_event(struct interface *iface, enum interface_event ev)
+{
+	enum interface_event last_ev;
+
+	D(SYSTEM, "Queue hotplug handler for interface '%s'\n", iface->name);
+	if (current == iface)
+		last_ev = current_ev;
+	else
+		last_ev = iface->hotplug_ev;
+
+	iface->hotplug_ev = ev;
+	if (last_ev == ev && !list_empty(&iface->hotplug_list))
+		list_del(&iface->hotplug_list);
+	else if (last_ev != ev && list_empty(&iface->hotplug_list))
+		list_add(&iface->hotplug_list, &pending);
+
+	if (!task.pending && !current)
+		call_hotplug();
+}
+
+void
+interface_dequeue_event(struct interface *iface)
+{
+	if (iface == current)
+		current = NULL;
+
+	if (!list_empty(&iface->hotplug_list))
+		list_del_init(&iface->hotplug_list);
+}