add support for calls to a hotplug script on interface state changes

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5b847ec466d7ce2070dab9e7134cf941c0e155ed..47a3509208f1bac6cfa9ad5dbcfd08b8d542a873 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,7 +11,8 @@ IF(APPLE)
 ENDIF()
 
 SET(SOURCES
-       main.c utils.c interface.c interface-ip.c
+       main.c utils.c
+       interface.c interface-ip.c interface-hotplug.c
        proto.c proto-static.c proto-shell.c
        config.c device.c bridge.c vlan.c ubus.c)
 

diff --git a/interface-hotplug.c b/interface-hotplug.c
new file mode 100644 (file)
index 0000000..fff488a
--- /dev/null
+++ b/interface-hotplug.c
@@ -0,0 +1,101 @@
+#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);
+       run_cmd(current->name, current_ev == IFEV_UP);
+}
+
+static void
+task_complete(struct uloop_process *proc, int ret)
+{
+       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);
+}

diff --git a/interface.c b/interface.c
index f7ec520a1dfc0bc3e397023ce9ae48e7c0a56866..3820050eff038616e454250b47efecc30fe30700 100644 (file)
--- a/interface.c
+++ b/interface.c
@@ -78,7 +78,7 @@ void interface_add_error(struct interface *iface, const char *subsystem,
 static void
 interface_event(struct interface *iface, enum interface_event ev)
 {
-       /* TODO */
+       interface_queue_event(iface, ev);
 }
 
 static void
@@ -282,6 +282,7 @@ interface_init(struct interface *iface, const char *name,
 
        strncpy(iface->name, name, sizeof(iface->name) - 1);
        INIT_LIST_HEAD(&iface->errors);
+       INIT_LIST_HEAD(&iface->hotplug_list);
 
        iface->main_dev.cb = interface_cb;
        iface->l3_dev = &iface->main_dev;

diff --git a/interface.h b/interface.h
index 9a9b211fb9f8098a047eb0c87f4d9b54b396c6b7..4d53c83b2e37fd4b657b5e9aaa25bdaf78fb6836 100644 (file)
--- a/interface.h
+++ b/interface.h
@@ -8,8 +8,8 @@ struct interface;
 struct interface_proto_state;
 
 enum interface_event {
-       IFEV_UP,
        IFEV_DOWN,
+       IFEV_UP,
 };
 
 enum interface_state {
@@ -38,6 +38,8 @@ struct interface_error {
  */
 struct interface {
        struct vlist_node node;
+       struct list_head hotplug_list;
+       enum interface_event hotplug_ev;
 
        char name[IFNAMSIZ];
        const char *ifname;
@@ -91,6 +93,9 @@ void interface_remove_link(struct interface *iface, struct device *llif);
 void interface_add_error(struct interface *iface, const char *subsystem,
                         const char *code, const char **data, int n_data);
 
+void interface_queue_event(struct interface *iface, enum interface_event ev);
+void interface_dequeue_event(struct interface *iface);
+
 void interface_start_pending(void);
 
 #endif

diff --git a/main.c b/main.c
index 465398f219ac606effdfe3afb5a8cb4cb4d13b9d..4757b79ed0b7096a5a8dae8c32a76b4b43cabed9 100644 (file)
--- a/main.c
+++ b/main.c
@@ -46,6 +46,8 @@ static int usage(const char *progname)
                " -d <mask>:            Mask for debug messages\n"
                " -s <path>:            Path to the ubus socket\n"
                " -p <path>:            Path to netifd addons (default: %s)\n"
+               " -h <path>:            Path to the hotplug script\n"
+               "                       (default: "DEFAULT_HOTPLUG_PATH")\n"
                "\n", progname, main_path);
 
        return 1;
@@ -69,6 +71,9 @@ int main(int argc, char **argv)
                case 'p':
                        main_path = optarg;
                        break;
+               case 'h':
+                       hotplug_cmd_path = optarg;
+                       break;
                default:
                        return usage(argv[0]);
                }

diff --git a/netifd.h b/netifd.h
index 1bb3820cb49bb19614bc78f3ec2ba3c4a83c05d0..926cab848dd5727b3db8b98aef73e1a27d20bc38 100644 (file)
--- a/netifd.h
+++ b/netifd.h
@@ -13,6 +13,13 @@
 
 #include "utils.h"
 
+#ifdef DUMMY_MODE
+#define DEFAULT_HOTPLUG_PATH   "./scripts/hotplug-cmd"
+#else
+#define DEFAULT_HOTPLUG_PATH   "/sbin/hotplug-cmd"
+#endif
+
+extern char *hotplug_cmd_path;
 extern unsigned int debug_mask;
 
 enum {

diff --git a/scripts/hotplug-cmd b/scripts/hotplug-cmd
new file mode 100755 (executable)
index 0000000..2488a77
--- /dev/null
+++ b/scripts/hotplug-cmd
@@ -0,0 +1 @@
+echo "Action: $ACTION, Interface: $INTERFACE"