proto-shell: rework task statemachine
[project/netifd.git] / proto-shell.c
index 726977a..5e89288 100644 (file)
 
 static struct netifd_fd proto_fd;
 
+enum proto_shell_sm {
+       S_IDLE,
+       S_SETUP,
+       S_SETUP_ABORT,
+       S_TEARDOWN,
+};
+
 struct proto_shell_handler {
        struct list_head list;
        struct proto_handler proto;
        struct config_param_list config;
        char *config_buf;
+       bool init_available;
        char script_name[];
 };
 
@@ -35,13 +43,15 @@ struct proto_shell_state {
 
        struct device_user l3_dev;
 
-       struct uloop_timeout setup_timeout;
+       struct uloop_timeout teardown_timeout;
+
        struct netifd_process setup_task;
        struct netifd_process teardown_task;
-       bool teardown_pending;
-       bool teardown_wait_task;
-
        struct netifd_process proto_task;
+
+       enum proto_shell_sm sm;
+       bool proto_task_killed;
+
        int last_error;
 };
 
@@ -67,18 +77,28 @@ proto_shell_handler(struct interface_proto_state *proto,
                proc = &state->setup_task;
                state->last_error = -1;
        } else {
-               action = "teardown";
-               proc = &state->teardown_task;
-               if (state->setup_task.uloop.pending && !state->teardown_wait_task) {
-                       uloop_timeout_set(&state->setup_timeout, 1000);
-                       kill(state->setup_task.uloop.pid, SIGTERM);
-                       state->teardown_pending = true;
+               if (state->sm == S_TEARDOWN)
+                       return 0;
+
+               if (state->setup_task.uloop.pending) {
+                       if (state->sm != S_SETUP_ABORT) {
+                               uloop_timeout_set(&state->teardown_timeout, 1000);
+                               kill(state->setup_task.uloop.pid, SIGTERM);
+                               if (state->proto_task.uloop.pending)
+                                       kill(state->proto_task.uloop.pid, SIGTERM);
+                               state->sm = S_SETUP_ABORT;
+                       }
                        return 0;
                }
+
+               action = "teardown";
+               proc = &state->teardown_task;
+               state->sm = S_TEARDOWN;
                if (state->last_error >= 0) {
                        snprintf(error_buf, sizeof(error_buf), "ERROR=%d", state->last_error);
                        envp[j++] = error_buf;
                }
+               uloop_timeout_set(&state->teardown_timeout, 5000);
        }
 
        config = blobmsg_format_json(state->config, true);
@@ -102,12 +122,58 @@ proto_shell_handler(struct interface_proto_state *proto,
 }
 
 static void
-proto_shell_setup_timeout_cb(struct uloop_timeout *timeout)
+proto_shell_task_finish(struct proto_shell_state *state,
+                       struct netifd_process *task)
+{
+       switch (state->sm) {
+       case S_IDLE:
+               if (task == &state->proto_task)
+                       state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
+               /* fall through */
+       case S_SETUP:
+               if (task == &state->proto_task)
+                       proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN,
+                                           false);
+               break;
+
+       case S_SETUP_ABORT:
+               if (state->setup_task.uloop.pending ||
+                   state->proto_task.uloop.pending)
+                       break;
+
+               uloop_timeout_cancel(&state->teardown_timeout);
+               state->sm = S_IDLE;
+               proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
+               break;
+
+       case S_TEARDOWN:
+               if (state->teardown_task.uloop.pending)
+                       break;
+
+               if (state->proto_task.uloop.pending) {
+                       if (!state->proto_task_killed)
+                               kill(state->proto_task.uloop.pid, SIGTERM);
+                       break;
+               }
+
+               uloop_timeout_cancel(&state->teardown_timeout);
+               state->sm = S_IDLE;
+               state->proto.proto_event(&state->proto, IFPEV_DOWN);
+               break;
+       }
+}
+
+static void
+proto_shell_teardown_timeout_cb(struct uloop_timeout *timeout)
 {
        struct proto_shell_state *state;
 
-       state = container_of(timeout, struct proto_shell_state, setup_timeout);
-       kill(state->setup_task.uloop.pid, SIGKILL);
+       state = container_of(timeout, struct proto_shell_state, teardown_timeout);
+
+       netifd_kill_process(&state->setup_task);
+       netifd_kill_process(&state->proto_task);
+       netifd_kill_process(&state->teardown_task);
+       proto_shell_task_finish(state, NULL);
 }
 
 static void
@@ -116,11 +182,7 @@ proto_shell_setup_cb(struct netifd_process *p, int ret)
        struct proto_shell_state *state;
 
        state = container_of(p, struct proto_shell_state, setup_task);
-       uloop_timeout_cancel(&state->setup_timeout);
-       if (state->teardown_pending) {
-               state->teardown_pending = false;
-               proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
-       }
+       proto_shell_task_finish(state, p);
 }
 
 static void
@@ -129,35 +191,20 @@ proto_shell_teardown_cb(struct netifd_process *p, int ret)
        struct proto_shell_state *state;
 
        state = container_of(p, struct proto_shell_state, teardown_task);
-
-       if (state->teardown_wait_task)
-               return;
-
-       netifd_kill_process(&state->proto_task);
-       state->proto.proto_event(&state->proto, IFPEV_DOWN);
+       proto_shell_task_finish(state, p);
 }
 
 static void
 proto_shell_task_cb(struct netifd_process *p, int ret)
 {
        struct proto_shell_state *state;
-       bool teardown_wait_task;
 
        state = container_of(p, struct proto_shell_state, proto_task);
 
-       teardown_wait_task = state->teardown_wait_task;
-       state->teardown_wait_task = false;
-       if (state->teardown_pending || state->teardown_task.uloop.pending)
-               return;
+       if (state->sm == S_IDLE || state->sm == S_SETUP)
+               state->last_error = WEXITSTATUS(ret);
 
-       if (teardown_wait_task) {
-               proto_shell_teardown_cb(&state->teardown_task, 0);
-               return;
-       }
-
-       state->last_error = ret;
-       state->proto.proto_event(&state->proto, IFPEV_LINK_LOST);
-       proto_shell_handler(&state->proto, PROTO_CMD_TEARDOWN, false);
+       proto_shell_task_finish(state, p);
 }
 
 static void
@@ -216,9 +263,11 @@ proto_shell_parse_route_list(struct interface *iface, struct blob_attr *attr,
 
 enum {
        NOTIFY_ACTION,
+       NOTIFY_ERROR,
        NOTIFY_COMMAND,
        NOTIFY_ENV,
        NOTIFY_SIGNAL,
+       NOTIFY_AVAILABLE,
        NOTIFY_LINK_UP,
        NOTIFY_IFNAME,
        NOTIFY_ADDR_EXT,
@@ -233,9 +282,11 @@ enum {
 
 static const struct blobmsg_policy notify_attr[__NOTIFY_LAST] = {
        [NOTIFY_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_INT32 },
+       [NOTIFY_ERROR] = { .name = "error", .type = BLOBMSG_TYPE_ARRAY },
        [NOTIFY_COMMAND] = { .name = "command", .type = BLOBMSG_TYPE_ARRAY },
        [NOTIFY_ENV] = { .name = "env", .type = BLOBMSG_TYPE_ARRAY },
        [NOTIFY_SIGNAL] = { .name = "signal", .type = BLOBMSG_TYPE_INT32 },
+       [NOTIFY_AVAILABLE] = { .name = "available", .type = BLOBMSG_TYPE_BOOL },
        [NOTIFY_LINK_UP] = { .name = "link-up", .type = BLOBMSG_TYPE_BOOL },
        [NOTIFY_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
        [NOTIFY_ADDR_EXT] = { .name = "address-external", .type = BLOBMSG_TYPE_BOOL },
@@ -374,14 +425,67 @@ proto_shell_kill_command(struct proto_shell_state *state, struct blob_attr **tb)
                signal = SIGTERM;
 
        if (state->proto_task.uloop.pending) {
+               state->proto_task_killed = true;
                kill(state->proto_task.uloop.pid, signal);
-               state->teardown_wait_task = true;
        }
 
        return 0;
 }
 
 static int
+proto_shell_notify_error(struct proto_shell_state *state, struct blob_attr **tb)
+{
+       struct blob_attr *cur;
+       char *data[16];
+       int n_data = 0;
+       int rem;
+
+       if (!tb[NOTIFY_ERROR])
+               return UBUS_STATUS_INVALID_ARGUMENT;
+
+       blobmsg_for_each_attr(cur, tb[NOTIFY_ERROR], rem) {
+               if (n_data + 1 == ARRAY_SIZE(data))
+                       goto error;
+
+               if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
+                       goto error;
+
+               if (!blobmsg_check_attr(cur, NULL))
+                       goto error;
+
+               data[n_data++] = blobmsg_data(cur);
+       }
+
+       if (!n_data)
+               goto error;
+
+       interface_add_error(state->proto.iface, state->handler->proto.name,
+                       data[0], (const char **) &data[1], n_data - 1);
+
+       return 0;
+
+error:
+       return UBUS_STATUS_INVALID_ARGUMENT;
+}
+
+static int
+proto_shell_block_restart(struct proto_shell_state *state, struct blob_attr **tb)
+{
+       state->proto.iface->autostart = false;
+       return 0;
+}
+
+static int
+proto_shell_set_available(struct proto_shell_state *state, struct blob_attr **tb)
+{
+       if (!tb[NOTIFY_AVAILABLE])
+               return UBUS_STATUS_INVALID_ARGUMENT;
+
+       interface_set_available(state->proto.iface, blobmsg_get_bool(tb[NOTIFY_AVAILABLE]));
+       return 0;
+}
+
+static int
 proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
 {
        struct proto_shell_state *state;
@@ -400,6 +504,12 @@ proto_shell_notify(struct interface_proto_state *proto, struct blob_attr *attr)
                return proto_shell_run_command(state, tb);
        case 2:
                return proto_shell_kill_command(state, tb);
+       case 3:
+               return proto_shell_notify_error(state, tb);
+       case 4:
+               return proto_shell_block_restart(state, tb);
+       case 5:
+               return proto_shell_set_available(state, tb);
        default:
                return UBUS_STATUS_INVALID_ARGUMENT;
        }
@@ -420,7 +530,7 @@ proto_shell_attach(const struct proto_handler *h, struct interface *iface,
        state->proto.free = proto_shell_free;
        state->proto.notify = proto_shell_notify;
        state->proto.cb = proto_shell_handler;
-       state->setup_timeout.cb = proto_shell_setup_timeout_cb;
+       state->teardown_timeout.cb = proto_shell_teardown_timeout_cb;
        state->setup_task.cb = proto_shell_setup_cb;
        state->setup_task.dir_fd = proto_fd.fd;
        state->setup_task.log_prefix = iface->name;
@@ -552,6 +662,10 @@ proto_shell_add_handler(const char *script, json_object *obj)
        if (tmp && json_object_get_boolean(tmp))
                handler->proto.flags |= PROTO_FLAG_NODEV;
 
+       tmp = get_field(obj, "available", json_type_boolean);
+       if (tmp && json_object_get_boolean(tmp))
+               handler->proto.flags |= PROTO_FLAG_INIT_AVAILABLE;
+
        config = get_field(obj, "config", json_type_array);
        if (config)
                handler->config_buf = proto_shell_parse_config(&handler->config, config);