144 lines
3 KiB
C
144 lines
3 KiB
C
#include "ubusd.h"
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static struct avl_tree patterns;
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static LIST_HEAD(catch_all);
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static struct ubus_object *event_obj;
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enum evs_type {
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EVS_PATTERN,
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EVS_CATCHALL
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};
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struct event_source {
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struct list_head list;
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struct ubus_object *obj;
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enum evs_type type;
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union {
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struct {
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struct avl_node avl;
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} pattern;
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struct {
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struct list_head list;
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} catchall;
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};
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};
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struct event_pattern {
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struct event_source evs;
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struct list_head list;
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};
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struct event_catchall {
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struct event_source evs;
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struct list_head list;
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struct ubus_object *obj;
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};
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static void ubusd_delete_event_source(struct event_source *evs)
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{
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list_del(&evs->list);
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switch (evs->type) {
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case EVS_PATTERN:
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avl_delete(&patterns, &evs->pattern.avl);
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break;
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case EVS_CATCHALL:
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list_del(&evs->catchall.list);
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break;
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}
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free(evs);
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}
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void ubusd_event_cleanup_object(struct ubus_object *obj)
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{
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struct event_source *ev;
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while (!list_empty(&obj->events)) {
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ev = list_first_entry(&obj->events, struct event_source, list);
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ubusd_delete_event_source(ev);
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}
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}
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enum {
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EVMSG_PATTERN,
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EVMSG_OBJECT,
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EVMSG_LAST,
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};
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static struct blobmsg_policy ev_policy[] = {
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[EVMSG_PATTERN] = { .name = "pattern", .type = BLOBMSG_TYPE_STRING },
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[EVMSG_OBJECT] = { .name = "object", .type = BLOBMSG_TYPE_INT32 },
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};
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static struct event_source *ubusd_alloc_event_source(struct ubus_object *obj, enum evs_type type, int datalen)
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{
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struct event_source *evs;
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evs = calloc(1, sizeof(*evs) + datalen);
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list_add(&evs->list, &obj->events);
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evs->obj = obj;
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evs->type = type;
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return evs;
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}
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static int ubusd_alloc_catchall(struct ubus_object *obj)
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{
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struct event_source *evs;
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evs = ubusd_alloc_event_source(obj, EVS_CATCHALL, 0);
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list_add(&evs->catchall.list, &catch_all);
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return 0;
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}
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static int ubusd_alloc_event_pattern(struct ubus_client *cl, struct blob_attr *msg)
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{
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struct event_source *ev;
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struct ubus_object *obj;
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struct blob_attr *attr[EVMSG_LAST];
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const char *pattern;
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uint32_t id;
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blobmsg_parse(ev_policy, EVMSG_LAST, attr, blob_data(msg), blob_len(msg));
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if (!attr[EVMSG_OBJECT])
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return UBUS_STATUS_INVALID_ARGUMENT;
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id = blobmsg_get_u32(attr[EVMSG_OBJECT]);
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if (id < UBUS_SYSTEM_OBJECT_MAX)
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return UBUS_STATUS_PERMISSION_DENIED;
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obj = ubusd_find_object(id);
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if (!obj)
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return UBUS_STATUS_NOT_FOUND;
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if (obj->client != cl)
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return UBUS_STATUS_PERMISSION_DENIED;
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if (!attr[EVMSG_PATTERN])
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return ubusd_alloc_catchall(obj);
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pattern = blobmsg_data(attr[EVMSG_PATTERN]);
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ev = ubusd_alloc_event_source(obj, EVS_PATTERN, strlen(pattern) + 1);
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ev->pattern.avl.key = (void *) (ev + 1);
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strcpy(ev->pattern.avl.key, pattern);
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avl_insert(&patterns, &ev->pattern.avl);
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return 0;
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}
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static int ubusd_event_recv(struct ubus_client *cl, const char *method, struct blob_attr *msg)
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{
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if (!strcmp(method, "register"))
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return ubusd_alloc_event_pattern(cl, msg);
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return UBUS_STATUS_INVALID_COMMAND;
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}
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void ubusd_event_init(void)
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{
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ubus_init_string_tree(&patterns, true);
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event_obj = ubusd_create_object_internal(NULL, UBUS_SYSTEM_OBJECT_EVENT);
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event_obj->recv_msg = ubusd_event_recv;
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}
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