+/*
+ * Copyright (C) 2011 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <arpa/inet.h>
#include "ubusd.h"
static struct avl_tree patterns;
static struct ubus_object *event_obj;
+static int event_seq = 0;
+static int obj_event_seq = 1;
-struct event_pattern {
+struct event_source {
+ struct list_head list;
+ struct ubus_object *obj;
struct avl_node avl;
+ bool partial;
+};
- struct ubus_object *obj;
- struct list_head list;
+static void ubusd_delete_event_source(struct event_source *evs)
+{
+ list_del(&evs->list);
+ avl_delete(&patterns, &evs->avl);
+ free(evs);
+}
+
+void ubusd_event_cleanup_object(struct ubus_object *obj)
+{
+ struct event_source *ev;
+
+ while (!list_empty(&obj->events)) {
+ ev = list_first_entry(&obj->events, struct event_source, list);
+ ubusd_delete_event_source(ev);
+ }
+}
+
+enum {
+ EVREG_PATTERN,
+ EVREG_OBJECT,
+ EVREG_LAST,
+};
- const char *path;
+static struct blobmsg_policy evr_policy[] = {
+ [EVREG_PATTERN] = { .name = "pattern", .type = BLOBMSG_TYPE_STRING },
+ [EVREG_OBJECT] = { .name = "object", .type = BLOBMSG_TYPE_INT32 },
};
-static void ubusd_delete_event_pattern(struct event_pattern *ev)
+static int ubusd_alloc_event_pattern(struct ubus_client *cl, struct blob_attr *msg)
{
- list_del(&ev->list);
- avl_delete(&patterns, &ev->avl);
- free(ev);
+ struct event_source *ev;
+ struct ubus_object *obj;
+ struct blob_attr *attr[EVREG_LAST];
+ char *pattern, *name;
+ uint32_t id;
+ bool partial = false;
+ int len;
+
+ blobmsg_parse(evr_policy, EVREG_LAST, attr, blob_data(msg), blob_len(msg));
+ if (!attr[EVREG_OBJECT] || !attr[EVREG_PATTERN])
+ return UBUS_STATUS_INVALID_ARGUMENT;
+
+ id = blobmsg_get_u32(attr[EVREG_OBJECT]);
+ if (id < UBUS_SYSTEM_OBJECT_MAX)
+ return UBUS_STATUS_PERMISSION_DENIED;
+
+ obj = ubusd_find_object(id);
+ if (!obj)
+ return UBUS_STATUS_NOT_FOUND;
+
+ if (obj->client != cl)
+ return UBUS_STATUS_PERMISSION_DENIED;
+
+ pattern = blobmsg_data(attr[EVREG_PATTERN]);
+
+ len = strlen(pattern);
+ if (pattern[len - 1] == '*') {
+ partial = true;
+ pattern[len - 1] = 0;
+ len--;
+ }
+
+ ev = calloc(1, sizeof(*ev) + len + 1);
+ if (!ev)
+ return UBUS_STATUS_NO_DATA;
+
+ list_add(&ev->list, &obj->events);
+ ev->obj = obj;
+ ev->partial = partial;
+ name = (char *) (ev + 1);
+ strcpy(name, pattern);
+ ev->avl.key = name;
+ avl_insert(&patterns, &ev->avl);
+
+ return 0;
}
-void ubusd_event_cleanup_object(struct ubus_object *obj)
+static void ubusd_send_event_msg(struct ubus_msg_buf **ub, struct ubus_client *cl,
+ struct ubus_object *obj, const char *id,
+ event_fill_cb fill_cb, void *cb_priv)
{
- struct event_pattern *ev;
+ uint32_t *objid_ptr;
+
+ /* do not loop back events */
+ if (obj->client == cl)
+ return;
- while (!list_empty(&obj->event_patterns)) {
- ev = list_first_entry(&obj->event_patterns,
- struct event_pattern, list);
- ubusd_delete_event_pattern(ev);
+ /* do not send duplicate events */
+ if (obj->event_seen == obj_event_seq)
+ return;
+
+ obj->event_seen = obj_event_seq;
+
+ if (!*ub) {
+ *ub = fill_cb(cb_priv, id);
+ (*ub)->hdr.type = UBUS_MSG_INVOKE;
+ (*ub)->hdr.peer = 0;
}
+
+ objid_ptr = blob_data(blob_data((*ub)->data));
+ *objid_ptr = htonl(obj->id.id);
+
+ (*ub)->hdr.seq = ++event_seq;
+ ubus_msg_send(obj->client, *ub, false);
}
-static int ubusd_event_recv(struct ubus_client *cl, const char *method, struct blob_attr *msg)
+static bool strmatch_len(const char *s1, const char *s2, int *len)
{
- fprintf(stderr, "event: call to method '%s'\n", method);
+ for (*len = 0; s1[*len] == s2[*len]; (*len)++)
+ if (!s1[*len])
+ return true;
+
+ return false;
+}
+
+int ubusd_send_event(struct ubus_client *cl, const char *id,
+ event_fill_cb fill_cb, void *cb_priv)
+{
+ struct ubus_msg_buf *ub = NULL;
+ struct event_source *ev;
+ int match_len = 0;
+
+ obj_event_seq++;
+
+ /*
+ * Since this tree is sorted alphabetically, we can only expect to find
+ * matching entries as long as the number of matching characters
+ * between the pattern string and our string is monotonically increasing.
+ */
+ avl_for_each_element(&patterns, ev, avl) {
+ const char *key = ev->avl.key;
+ int cur_match_len;
+ bool full_match;
+
+ full_match = strmatch_len(id, key, &cur_match_len);
+ if (cur_match_len < match_len)
+ break;
+
+ match_len = cur_match_len;
+
+ if (!full_match) {
+ if (!ev->partial)
+ continue;
+
+ if (match_len != strlen(key))
+ continue;
+ }
+
+ ubusd_send_event_msg(&ub, cl, ev->obj, id, fill_cb, cb_priv);
+ }
+
+ if (ub)
+ ubus_msg_free(ub);
+
return 0;
}
+enum {
+ EVMSG_ID,
+ EVMSG_DATA,
+ EVMSG_LAST,
+};
+
+static struct blobmsg_policy ev_policy[] = {
+ [EVMSG_ID] = { .name = "id", .type = BLOBMSG_TYPE_STRING },
+ [EVMSG_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
+};
+
+static struct ubus_msg_buf *
+ubusd_create_event_from_msg(void *priv, const char *id)
+{
+ struct blob_attr *msg = priv;
+
+ blob_buf_init(&b, 0);
+ blob_put_int32(&b, UBUS_ATTR_OBJID, 0);
+ blob_put_string(&b, UBUS_ATTR_METHOD, id);
+ blob_put(&b, UBUS_ATTR_DATA, blobmsg_data(msg), blobmsg_data_len(msg));
+
+ return ubus_msg_new(b.head, blob_raw_len(b.head), true);
+}
+
+static int ubusd_forward_event(struct ubus_client *cl, struct blob_attr *msg)
+{
+ struct blob_attr *data;
+ struct blob_attr *attr[EVMSG_LAST];
+ const char *id;
+
+ blobmsg_parse(ev_policy, EVMSG_LAST, attr, blob_data(msg), blob_len(msg));
+ if (!attr[EVMSG_ID] || !attr[EVMSG_DATA])
+ return UBUS_STATUS_INVALID_ARGUMENT;
+
+ id = blobmsg_data(attr[EVMSG_ID]);
+ data = attr[EVMSG_DATA];
+
+ if (!strncmp(id, "ubus.", 5))
+ return UBUS_STATUS_PERMISSION_DENIED;
+
+ return ubusd_send_event(cl, id, ubusd_create_event_from_msg, data);
+}
+
+static int ubusd_event_recv(struct ubus_client *cl, struct ubus_msg_buf *ub, const char *method, struct blob_attr *msg)
+{
+ if (!strcmp(method, "register"))
+ return ubusd_alloc_event_pattern(cl, msg);
+
+ if (!strcmp(method, "send"))
+ return ubusd_forward_event(cl, msg);
+
+ return UBUS_STATUS_INVALID_COMMAND;
+}
+
+static struct ubus_msg_buf *
+ubusd_create_object_event_msg(void *priv, const char *id)
+{
+ struct ubus_object *obj = priv;
+ void *s;
+
+ blob_buf_init(&b, 0);
+ blob_put_int32(&b, UBUS_ATTR_OBJID, 0);
+ blob_put_string(&b, UBUS_ATTR_METHOD, id);
+ s = blob_nest_start(&b, UBUS_ATTR_DATA);
+ blobmsg_add_u32(&b, "id", obj->id.id);
+ blobmsg_add_string(&b, "path", obj->path.key);
+ blob_nest_end(&b, s);
+
+ return ubus_msg_new(b.head, blob_raw_len(b.head), true);
+}
+
+void ubusd_send_obj_event(struct ubus_object *obj, bool add)
+{
+ const char *id = add ? "ubus.object.add" : "ubus.object.remove";
+
+ ubusd_send_event(NULL, id, ubusd_create_object_event_msg, obj);
+}
+
void ubusd_event_init(void)
{
ubus_init_string_tree(&patterns, true);
event_obj = ubusd_create_object_internal(NULL, UBUS_SYSTEM_OBJECT_EVENT);
- event_obj->recv_msg = ubusd_event_recv;
+ if (event_obj != NULL)
+ event_obj->recv_msg = ubusd_event_recv;
}
projects / project / ubus.git / blobdiff