Mirror of the official OpenWrt ubus repository https://git.openwrt.org/project/ubus
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 

499 lines
11 KiB

/*
* Copyright (C) 2011-2014 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 <unistd.h>
#include "libubus.h"
#include "libubus-internal.h"
struct ubus_pending_data {
struct list_head list;
int type;
struct blob_attr data[];
};
static void req_data_cb(struct ubus_request *req, int type, struct blob_attr *data)
{
struct blob_attr **attr;
if (req->raw_data_cb)
req->raw_data_cb(req, type, data);
if (!req->data_cb)
return;
attr = ubus_parse_msg(data, blob_raw_len(data));
if (!attr[UBUS_ATTR_DATA])
return;
req->data_cb(req, type, attr[UBUS_ATTR_DATA]);
}
static void __ubus_process_req_data(struct ubus_request *req)
{
struct ubus_pending_data *data, *tmp;
list_for_each_entry_safe(data, tmp, &req->pending, list) {
list_del(&data->list);
if (!req->cancelled)
req_data_cb(req, data->type, data->data);
free(data);
}
}
int __hidden __ubus_start_request(struct ubus_context *ctx, struct ubus_request *req,
struct blob_attr *msg, int cmd, uint32_t peer)
{
if (msg && blob_pad_len(msg) > UBUS_MAX_MSGLEN)
return -1;
INIT_LIST_HEAD(&req->list);
INIT_LIST_HEAD(&req->pending);
req->ctx = ctx;
req->peer = peer;
req->seq = ++ctx->request_seq;
return ubus_send_msg(ctx, req->seq, msg, cmd, peer, req->fd);
}
int __hidden ubus_start_request(struct ubus_context *ctx, struct ubus_request *req,
struct blob_attr *msg, int cmd, uint32_t peer)
{
memset(req, 0, sizeof(*req));
req->fd = -1;
return __ubus_start_request(ctx, req, msg, cmd, peer);
}
void ubus_abort_request(struct ubus_context *ctx, struct ubus_request *req)
{
if (list_empty(&req->list))
return;
req->cancelled = true;
__ubus_process_req_data(req);
list_del_init(&req->list);
}
void ubus_complete_request_async(struct ubus_context *ctx, struct ubus_request *req)
{
if (!list_empty(&req->list))
return;
list_add(&req->list, &ctx->requests);
}
static void
ubus_req_complete_cb(struct ubus_request *req)
{
ubus_complete_handler_t cb = req->complete_cb;
if (!cb)
return;
req->complete_cb = NULL;
cb(req, req->status_code);
}
static void
ubus_set_req_status(struct ubus_request *req, int ret)
{
if (!list_empty(&req->list))
list_del_init(&req->list);
req->status_msg = true;
req->status_code = ret;
if (!req->blocked)
ubus_req_complete_cb(req);
}
static void ubus_sync_req_cb(struct ubus_request *req, int ret)
{
req->status_msg = true;
req->status_code = ret;
req->ctx->cancel_poll = true;
}
static int64_t get_time_msec(void)
{
struct timespec ts;
int64_t val;
clock_gettime(CLOCK_MONOTONIC, &ts);
val = (int64_t) ts.tv_sec * 1000LL;
val += ts.tv_nsec / 1000000LL;
return val;
}
int ubus_complete_request(struct ubus_context *ctx, struct ubus_request *req,
int req_timeout)
{
ubus_complete_handler_t complete_cb = req->complete_cb;
int status = UBUS_STATUS_NO_DATA;
int64_t timeout = 0, time_end = 0;
if (req_timeout)
time_end = get_time_msec() + req_timeout;
ubus_complete_request_async(ctx, req);
req->complete_cb = ubus_sync_req_cb;
ctx->stack_depth++;
while (!req->status_msg) {
if (req_timeout) {
timeout = time_end - get_time_msec();
if (timeout <= 0) {
ubus_set_req_status(req, UBUS_STATUS_TIMEOUT);
break;
}
}
ubus_poll_data(ctx, (unsigned int) timeout);
if (ctx->sock.eof) {
ubus_set_req_status(req, UBUS_STATUS_CONNECTION_FAILED);
ctx->cancel_poll = true;
break;
}
}
ctx->stack_depth--;
if (ctx->stack_depth)
ctx->cancel_poll = true;
if (req->status_msg)
status = req->status_code;
req->complete_cb = complete_cb;
if (req->complete_cb)
req->complete_cb(req, status);
if (!ctx->stack_depth && !ctx->sock.registered)
ctx->pending_timer.cb(&ctx->pending_timer);
return status;
}
void ubus_complete_deferred_request(struct ubus_context *ctx, struct ubus_request_data *req, int ret)
{
blob_buf_init(&b, 0);
blob_put_int32(&b, UBUS_ATTR_STATUS, ret);
blob_put_int32(&b, UBUS_ATTR_OBJID, req->object);
ubus_send_msg(ctx, req->seq, b.head, UBUS_MSG_STATUS, req->peer, req->fd);
}
static void ubus_put_data(struct blob_buf *buf, struct blob_attr *msg)
{
if (msg)
blob_put(buf, UBUS_ATTR_DATA, blob_data(msg), blob_len(msg));
else
blob_put(buf, UBUS_ATTR_DATA, NULL, 0);
}
int ubus_send_reply(struct ubus_context *ctx, struct ubus_request_data *req,
struct blob_attr *msg)
{
int ret;
blob_buf_init(&b, 0);
blob_put_int32(&b, UBUS_ATTR_OBJID, req->object);
ubus_put_data(&b, msg);
ret = ubus_send_msg(ctx, req->seq, b.head, UBUS_MSG_DATA, req->peer, -1);
if (ret < 0)
return UBUS_STATUS_NO_DATA;
return 0;
}
int ubus_invoke_async_fd(struct ubus_context *ctx, uint32_t obj,
const char *method, struct blob_attr *msg,
struct ubus_request *req, int fd)
{
blob_buf_init(&b, 0);
blob_put_int32(&b, UBUS_ATTR_OBJID, obj);
blob_put_string(&b, UBUS_ATTR_METHOD, method);
ubus_put_data(&b, msg);
memset(req, 0, sizeof(*req));
req->fd = fd;
if (__ubus_start_request(ctx, req, b.head, UBUS_MSG_INVOKE, obj) < 0)
return UBUS_STATUS_INVALID_ARGUMENT;
return 0;
}
int ubus_invoke_fd(struct ubus_context *ctx, uint32_t obj, const char *method,
struct blob_attr *msg, ubus_data_handler_t cb, void *priv,
int timeout, int fd)
{
struct ubus_request req;
int rc;
rc = ubus_invoke_async_fd(ctx, obj, method, msg, &req, fd);
if (rc)
return rc;
req.data_cb = cb;
req.priv = priv;
return ubus_complete_request(ctx, &req, timeout);
}
static void
ubus_notify_complete_cb(struct ubus_request *req, int ret)
{
struct ubus_notify_request *nreq;
nreq = container_of(req, struct ubus_notify_request, req);
if (!nreq->complete_cb)
return;
nreq->complete_cb(nreq, 0, 0);
}
static void
ubus_notify_data_cb(struct ubus_request *req, int type, struct blob_attr *msg)
{
struct ubus_notify_request *nreq;
nreq = container_of(req, struct ubus_notify_request, req);
if (!nreq->data_cb)
return;
nreq->data_cb(nreq, type, msg);
}
static int
__ubus_notify_async(struct ubus_context *ctx, struct ubus_object *obj,
const char *type, struct blob_attr *msg,
struct ubus_notify_request *req, bool reply)
{
memset(req, 0, sizeof(*req));
blob_buf_init(&b, 0);
blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id);
blob_put_string(&b, UBUS_ATTR_METHOD, type);
ubus_put_data(&b, msg);
if (!reply)
blob_put_int8(&b, UBUS_ATTR_NO_REPLY, true);
if (ubus_start_request(ctx, &req->req, b.head, UBUS_MSG_NOTIFY, obj->id) < 0)
return UBUS_STATUS_INVALID_ARGUMENT;
/* wait for status message from ubusd first */
req->req.notify = true;
req->pending = 1;
req->id[0] = obj->id;
req->req.complete_cb = ubus_notify_complete_cb;
req->req.data_cb = ubus_notify_data_cb;
return 0;
}
int ubus_notify_async(struct ubus_context *ctx, struct ubus_object *obj,
const char *type, struct blob_attr *msg,
struct ubus_notify_request *req)
{
return __ubus_notify_async(ctx, obj, type, msg, req, true);
}
int ubus_notify(struct ubus_context *ctx, struct ubus_object *obj,
const char *type, struct blob_attr *msg, int timeout)
{
struct ubus_notify_request req;
int ret;
ret = __ubus_notify_async(ctx, obj, type, msg, &req, timeout >= 0);
if (ret < 0)
return ret;
if (timeout < 0) {
ubus_abort_request(ctx, &req.req);
return 0;
}
return ubus_complete_request(ctx, &req.req, timeout);
}
static bool ubus_get_status(struct ubus_msghdr_buf *buf, int *ret)
{
struct blob_attr **attrbuf = ubus_parse_msg(buf->data, blob_raw_len(buf->data));
if (!attrbuf[UBUS_ATTR_STATUS])
return false;
*ret = blob_get_u32(attrbuf[UBUS_ATTR_STATUS]);
return true;
}
static int
ubus_process_req_status(struct ubus_request *req, struct ubus_msghdr_buf *buf)
{
int ret = UBUS_STATUS_INVALID_ARGUMENT;
ubus_get_status(buf, &ret);
req->peer = buf->hdr.peer;
ubus_set_req_status(req, ret);
return ret;
}
static void
ubus_process_req_data(struct ubus_request *req, struct ubus_msghdr_buf *buf)
{
struct ubus_pending_data *data;
int len;
if (!req->blocked) {
req->blocked = true;
req_data_cb(req, buf->hdr.type, buf->data);
__ubus_process_req_data(req);
req->blocked = false;
if (req->status_msg)
ubus_req_complete_cb(req);
return;
}
len = blob_raw_len(buf->data);
data = calloc(1, sizeof(*data) + len);
if (!data)
return;
data->type = buf->hdr.type;
memcpy(data->data, buf->data, len);
list_add(&data->list, &req->pending);
}
static int
ubus_find_notify_id(struct ubus_notify_request *n, uint32_t objid)
{
uint32_t pending = n->pending;
int i;
for (i = 0; pending; i++, pending >>= 1) {
if (!(pending & 1))
continue;
if (n->id[i] == objid)
return i;
}
return -1;
}
static struct ubus_request *
ubus_find_request(struct ubus_context *ctx, uint32_t seq, uint32_t peer, int *id)
{
struct ubus_request *req;
list_for_each_entry(req, &ctx->requests, list) {
struct ubus_notify_request *nreq;
nreq = container_of(req, struct ubus_notify_request, req);
if (seq != req->seq)
continue;
if (req->notify) {
if (!nreq->pending)
continue;
*id = ubus_find_notify_id(nreq, peer);
if (*id < 0)
continue;
} else if (peer != req->peer)
continue;
return req;
}
return NULL;
}
static void ubus_process_notify_status(struct ubus_request *req, int id, struct ubus_msghdr_buf *buf)
{
struct ubus_notify_request *nreq;
struct blob_attr **tb;
struct blob_attr *cur;
size_t rem;
int idx = 1;
int ret = 0;
nreq = container_of(req, struct ubus_notify_request, req);
nreq->pending &= ~(1 << id);
if (!id) {
/* first id: ubusd's status message with a list of ids */
tb = ubus_parse_msg(buf->data, blob_raw_len(buf->data));
if (tb[UBUS_ATTR_SUBSCRIBERS]) {
blob_for_each_attr(cur, tb[UBUS_ATTR_SUBSCRIBERS], rem) {
if (!blob_check_type(blob_data(cur), blob_len(cur), BLOB_ATTR_INT32))
continue;
nreq->pending |= (1 << idx);
nreq->id[idx] = blob_get_int32(cur);
idx++;
if (idx == UBUS_MAX_NOTIFY_PEERS + 1)
break;
}
}
} else {
ubus_get_status(buf, &ret);
if (nreq->status_cb)
nreq->status_cb(nreq, id, ret);
}
if (!nreq->pending)
ubus_set_req_status(req, 0);
}
void __hidden ubus_process_req_msg(struct ubus_context *ctx, struct ubus_msghdr_buf *buf, int fd)
{
struct ubus_msghdr *hdr = &buf->hdr;
struct ubus_request *req;
int id = -1;
switch(hdr->type) {
case UBUS_MSG_STATUS:
req = ubus_find_request(ctx, hdr->seq, hdr->peer, &id);
if (!req)
break;
if (fd >= 0) {
if (req->fd_cb)
req->fd_cb(req, fd);
else
close(fd);
}
if (id >= 0)
ubus_process_notify_status(req, id, buf);
else
ubus_process_req_status(req, buf);
break;
case UBUS_MSG_DATA:
req = ubus_find_request(ctx, hdr->seq, hdr->peer, &id);
if (req && (req->data_cb || req->raw_data_cb))
ubus_process_req_data(req, buf);
break;
}
}
int __ubus_monitor(struct ubus_context *ctx, const char *type)
{
blob_buf_init(&b, 0);
return ubus_invoke(ctx, UBUS_SYSTEM_OBJECT_MONITOR, type, b.head, NULL, NULL, 1000);
}