275 lines
6.4 KiB
C
275 lines
6.4 KiB
C
#include <arpa/inet.h>
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#include "ubusd.h"
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static struct blob_buf b;
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static struct ubus_msg_buf *retmsg;
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static int *retmsg_data;
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static struct blob_attr *attrbuf[UBUS_ATTR_MAX];
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typedef int (*ubus_cmd_cb)(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr);
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static const struct blob_attr_info ubus_policy[UBUS_ATTR_MAX] = {
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[UBUS_ATTR_SIGNATURE] = { .type = BLOB_ATTR_NESTED },
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[UBUS_ATTR_OBJTYPE] = { .type = BLOB_ATTR_INT32 },
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[UBUS_ATTR_OBJPATH] = { .type = BLOB_ATTR_STRING },
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[UBUS_ATTR_OBJID] = { .type = BLOB_ATTR_INT32 },
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[UBUS_ATTR_STATUS] = { .type = BLOB_ATTR_INT32 },
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};
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struct blob_attr **ubus_parse_msg(struct blob_attr *msg)
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{
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blob_parse(msg, attrbuf, ubus_policy, UBUS_ATTR_MAX);
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return attrbuf;
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}
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static void ubus_msg_init(struct ubus_msg_buf *ub, uint8_t type, uint16_t seq, uint32_t peer)
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{
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ub->hdr.version = 0;
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ub->hdr.type = type;
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ub->hdr.seq = seq;
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ub->hdr.peer = peer;
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}
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static struct ubus_msg_buf *ubus_msg_from_blob(bool shared)
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{
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return ubus_msg_new(b.head, blob_raw_len(b.head), shared);
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}
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static struct ubus_msg_buf *ubus_reply_from_blob(struct ubus_msg_buf *ub, bool shared)
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{
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struct ubus_msg_buf *new;
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new = ubus_msg_new(b.head, blob_raw_len(b.head), shared);
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if (!new)
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return NULL;
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ubus_msg_init(new, UBUS_MSG_DATA, ub->hdr.seq, ub->hdr.peer);
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return new;
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}
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bool ubusd_send_hello(struct ubus_client *cl)
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{
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struct ubus_msg_buf *ub;
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blob_buf_init(&b, 0);
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ub = ubus_msg_from_blob(true);
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if (!ub)
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return false;
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ubus_msg_init(ub, UBUS_MSG_HELLO, 0, cl->id.id);
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ubus_msg_send(cl, ub);
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return true;
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}
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static int ubusd_send_pong(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
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{
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ub->hdr.type = UBUS_MSG_DATA;
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ubus_msg_send(cl, ubus_msg_ref(ub));
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return 0;
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}
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static int ubusd_handle_publish(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
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{
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struct ubus_object *obj;
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obj = ubusd_create_object(cl, attr);
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if (!obj)
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return UBUS_STATUS_INVALID_ARGUMENT;
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blob_buf_init(&b, 0);
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blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
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if (attr[UBUS_ATTR_SIGNATURE])
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blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id.id);
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ub = ubus_reply_from_blob(ub, true);
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if (!ub)
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return UBUS_STATUS_NO_DATA;
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ubus_msg_send(cl, ub);
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return 0;
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}
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static void ubusd_send_obj(struct ubus_client *cl, struct ubus_msg_buf *ub, struct ubus_object *obj)
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{
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struct ubus_method *m;
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void *s;
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blob_buf_init(&b, 0);
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if (obj->path.key)
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blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->path.key);
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blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
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blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id.id);
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s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
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list_for_each_entry(m, &obj->type->methods, list)
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blob_put(&b, blob_id(m->data), blob_data(m->data), blob_len(m->data));
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blob_nest_end(&b, s);
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ub = ubus_reply_from_blob(ub, true);
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if (!ub)
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return;
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ubus_msg_send(cl, ub);
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}
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static int ubusd_handle_lookup(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
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{
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struct ubus_object *obj;
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char *objpath;
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bool wildcard = false;
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bool found = false;
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int len;
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if (!attr[UBUS_ATTR_OBJPATH]) {
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avl_for_each_element(&path, obj, path)
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ubusd_send_obj(cl, ub, obj);
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return 0;
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}
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objpath = blob_data(attr[UBUS_ATTR_OBJPATH]);
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len = strlen(objpath);
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if (objpath[len - 1] != '*') {
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obj = avl_find_element(&path, objpath, obj, path);
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if (!obj)
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return UBUS_STATUS_NOT_FOUND;
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ubusd_send_obj(cl, ub, obj);
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return 0;
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}
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objpath[--len] = 0;
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wildcard = true;
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obj = avl_find_ge_element(&path, objpath, obj, path);
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if (!obj)
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return UBUS_STATUS_NOT_FOUND;
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while (!strncmp(objpath, obj->path.key, len)) {
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found = true;
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ubusd_send_obj(cl, ub, obj);
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if (obj == avl_last_element(&path, obj, path))
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break;
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obj = avl_next_element(obj, path);
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}
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if (!found)
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return UBUS_STATUS_NOT_FOUND;
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return 0;
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}
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static int ubusd_handle_invoke(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
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{
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struct ubus_object *obj = NULL;
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struct ubus_id *id;
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const char *method;
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if (!attr[UBUS_ATTR_METHOD] || !attr[UBUS_ATTR_OBJID])
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return UBUS_STATUS_INVALID_ARGUMENT;
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id = ubus_find_id(&objects, blob_get_int32(attr[UBUS_ATTR_OBJID]));
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if (!id)
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return UBUS_STATUS_NOT_FOUND;
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obj = container_of(id, struct ubus_object, id);
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method = blob_data(attr[UBUS_ATTR_METHOD]);
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blob_buf_init(&b, 0);
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blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
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blob_put_string(&b, UBUS_ATTR_METHOD, method);
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if (attr[UBUS_ATTR_DATA])
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blob_put(&b, UBUS_ATTR_DATA, blob_data(attr[UBUS_ATTR_DATA]),
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blob_len(attr[UBUS_ATTR_DATA]));
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ubus_msg_free(ub);
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ub = ubus_reply_from_blob(ub, true);
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if (!ub)
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return UBUS_STATUS_NO_DATA;
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ub->hdr.type = UBUS_MSG_INVOKE;
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ub->hdr.peer = cl->id.id;
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ubus_msg_send(obj->client, ub);
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return -1;
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}
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static int ubusd_handle_response(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
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{
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struct ubus_object *obj;
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struct ubus_id *id;
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if (!attr[UBUS_ATTR_OBJID] ||
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(ub->hdr.type == UBUS_MSG_STATUS && !attr[UBUS_ATTR_STATUS]) ||
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(ub->hdr.type == UBUS_MSG_DATA && !attr[UBUS_ATTR_DATA]))
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goto error;
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id = ubus_find_id(&objects, blob_get_int32(attr[UBUS_ATTR_OBJID]));
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if (!id)
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goto error;
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obj = container_of(id, struct ubus_object, id);
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if (cl != obj->client)
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goto error;
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cl = ubusd_get_client_by_id(ub->hdr.peer);
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if (!cl)
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goto error;
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ub->hdr.peer = blob_get_int32(attr[UBUS_ATTR_OBJID]);
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ubus_msg_send(cl, ub);
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return -1;
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error:
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ubus_msg_free(ub);
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return -1;
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}
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static const ubus_cmd_cb handlers[__UBUS_MSG_LAST] = {
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[UBUS_MSG_PING] = ubusd_send_pong,
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[UBUS_MSG_PUBLISH] = ubusd_handle_publish,
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[UBUS_MSG_LOOKUP] = ubusd_handle_lookup,
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[UBUS_MSG_INVOKE] = ubusd_handle_invoke,
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[UBUS_MSG_STATUS] = ubusd_handle_response,
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[UBUS_MSG_DATA] = ubusd_handle_response,
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};
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void ubusd_receive_message(struct ubus_client *cl, struct ubus_msg_buf *ub)
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{
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ubus_cmd_cb cb = NULL;
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int ret;
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retmsg->hdr.seq = ub->hdr.seq;
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retmsg->hdr.peer = ub->hdr.peer;
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if (ub->hdr.type < __UBUS_MSG_LAST)
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cb = handlers[ub->hdr.type];
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if (cb)
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ret = cb(cl, ub, ubus_parse_msg(ub->data));
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else
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ret = UBUS_STATUS_INVALID_COMMAND;
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if (ret == -1)
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return;
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ubus_msg_free(ub);
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*retmsg_data = htonl(ret);
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ubus_msg_send(cl, ubus_msg_ref(retmsg));
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}
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static void __init ubusd_proto_init(void)
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{
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blob_buf_init(&b, 0);
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blob_put_int32(&b, UBUS_ATTR_STATUS, 0);
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retmsg = ubus_msg_from_blob(false);
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if (!retmsg)
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exit(1);
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retmsg->hdr.type = UBUS_MSG_STATUS;
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retmsg_data = blob_data(blob_data(retmsg->data));
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}
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