Mirror of the official OpenWrt ubus repository https://git.openwrt.org/project/ubus
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/*
* Copyright (C) 2011-2012 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"
static void
ubus_process_unsubscribe(struct ubus_context *ctx, struct ubus_msghdr *hdr,
struct ubus_object *obj, struct blob_attr **attrbuf, int fd)
{
struct ubus_subscriber *s;
if (!obj || !attrbuf[UBUS_ATTR_TARGET])
return;
if (obj->methods != &watch_method)
return;
s = container_of(obj, struct ubus_subscriber, obj);
if (s->remove_cb)
s->remove_cb(ctx, s, blob_get_u32(attrbuf[UBUS_ATTR_TARGET]));
if (fd >= 0)
close(fd);
}
static void
ubus_process_notify(struct ubus_context *ctx, struct ubus_msghdr *hdr,
struct ubus_object *obj, struct blob_attr **attrbuf, int fd)
{
if (!obj || !attrbuf[UBUS_ATTR_ACTIVE])
return;
obj->has_subscribers = blob_get_u8(attrbuf[UBUS_ATTR_ACTIVE]);
if (obj->subscribe_cb)
obj->subscribe_cb(ctx, obj);
if (fd >= 0)
close(fd);
}
static void
ubus_process_invoke(struct ubus_context *ctx, struct ubus_msghdr *hdr,
struct ubus_object *obj, struct blob_attr **attrbuf, int fd)
{
struct ubus_request_data req = {
.fd = -1,
.req_fd = fd,
};
int method;
int ret;
bool no_reply = false;
if (!obj) {
ret = UBUS_STATUS_NOT_FOUND;
goto send;
}
if (!attrbuf[UBUS_ATTR_METHOD]) {
ret = UBUS_STATUS_INVALID_ARGUMENT;
goto send;
}
if (attrbuf[UBUS_ATTR_NO_REPLY])
no_reply = blob_get_int8(attrbuf[UBUS_ATTR_NO_REPLY]);
req.peer = hdr->peer;
req.seq = hdr->seq;
req.object = obj->id;
if (attrbuf[UBUS_ATTR_USER] && attrbuf[UBUS_ATTR_GROUP]) {
req.acl.user = blobmsg_get_string(attrbuf[UBUS_ATTR_USER]);
req.acl.group = blobmsg_get_string(attrbuf[UBUS_ATTR_GROUP]);
req.acl.object = obj->name;
}
for (method = 0; method < obj->n_methods; method++)
if (!obj->methods[method].name ||
!strcmp(obj->methods[method].name,
blob_data(attrbuf[UBUS_ATTR_METHOD])))
goto found;
/* not found */
ret = UBUS_STATUS_METHOD_NOT_FOUND;
goto send;
found:
if (!attrbuf[UBUS_ATTR_DATA]) {
ret = UBUS_STATUS_INVALID_ARGUMENT;
goto send;
}
ret = obj->methods[method].handler(ctx, obj, &req,
blob_data(attrbuf[UBUS_ATTR_METHOD]),
attrbuf[UBUS_ATTR_DATA]);
if (req.req_fd >= 0)
close(req.req_fd);
if (req.deferred || no_reply)
return;
send:
ubus_complete_deferred_request(ctx, &req, ret);
}
void __hidden ubus_process_obj_msg(struct ubus_context *ctx, struct ubus_msghdr_buf *buf, int fd)
{
void (*cb)(struct ubus_context *, struct ubus_msghdr *,
struct ubus_object *, struct blob_attr **, int fd);
struct ubus_msghdr *hdr = &buf->hdr;
struct blob_attr **attrbuf;
struct ubus_object *obj;
uint32_t objid;
void *prev_data = NULL;
attrbuf = ubus_parse_msg(buf->data, blob_raw_len(buf->data));
if (!attrbuf[UBUS_ATTR_OBJID])
return;
objid = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
obj = avl_find_element(&ctx->objects, &objid, obj, avl);
switch (hdr->type) {
case UBUS_MSG_INVOKE:
cb = ubus_process_invoke;
break;
case UBUS_MSG_UNSUBSCRIBE:
cb = ubus_process_unsubscribe;
break;
case UBUS_MSG_NOTIFY:
cb = ubus_process_notify;
break;
default:
return;
}
if (buf == &ctx->msgbuf) {
prev_data = buf->data;
buf->data = NULL;
}
cb(ctx, hdr, obj, attrbuf, fd);
if (prev_data) {
if (buf->data)
free(prev_data);
else
buf->data = prev_data;
}
}
static void ubus_add_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
{
struct ubus_object *obj = req->priv;
struct blob_attr **attrbuf = ubus_parse_msg(msg, blob_raw_len(msg));
if (!attrbuf[UBUS_ATTR_OBJID])
return;
obj->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJID]);
if (attrbuf[UBUS_ATTR_OBJTYPE])
obj->type->id = blob_get_u32(attrbuf[UBUS_ATTR_OBJTYPE]);
obj->avl.key = &obj->id;
avl_insert(&req->ctx->objects, &obj->avl);
}
static void ubus_push_method_data(const struct ubus_method *m)
{
void *mtbl;
int i;
mtbl = blobmsg_open_table(&b, m->name);
for (i = 0; i < m->n_policy; i++) {
if (m->mask && !(m->mask & (1 << i)))
continue;
blobmsg_add_u32(&b, m->policy[i].name, m->policy[i].type);
}
blobmsg_close_table(&b, mtbl);
}
static bool ubus_push_object_type(const struct ubus_object_type *type)
{
void *s;
int i;
s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
for (i = 0; i < type->n_methods; i++)
ubus_push_method_data(&type->methods[i]);
blob_nest_end(&b, s);
return true;
}
int ubus_add_object(struct ubus_context *ctx, struct ubus_object *obj)
{
struct ubus_request req;
int ret;
blob_buf_init(&b, 0);
if (obj->name && obj->type) {
blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->name);
if (obj->type->id)
blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id);
else if (!ubus_push_object_type(obj->type))
return UBUS_STATUS_INVALID_ARGUMENT;
}
if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_ADD_OBJECT, 0) < 0)
return UBUS_STATUS_INVALID_ARGUMENT;
req.raw_data_cb = ubus_add_object_cb;
req.priv = obj;
ret = ubus_complete_request(ctx, &req, 0);
if (ret)
return ret;
if (!obj->id)
return UBUS_STATUS_NO_DATA;
return 0;
}
static void ubus_remove_object_cb(struct ubus_request *req, int type, struct blob_attr *msg)
{
struct ubus_object *obj = req->priv;
struct blob_attr **attrbuf = ubus_parse_msg(msg, blob_raw_len(msg));
if (!attrbuf[UBUS_ATTR_OBJID])
return;
avl_delete(&req->ctx->objects, &obj->avl);
obj->id = 0;
if (attrbuf[UBUS_ATTR_OBJTYPE] && obj->type)
obj->type->id = 0;
}
int ubus_remove_object(struct ubus_context *ctx, struct ubus_object *obj)
{
struct ubus_request req;
int ret;
blob_buf_init(&b, 0);
blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id);
if (ubus_start_request(ctx, &req, b.head, UBUS_MSG_REMOVE_OBJECT, 0) < 0)
return UBUS_STATUS_INVALID_ARGUMENT;
req.raw_data_cb = ubus_remove_object_cb;
req.priv = obj;
ret = ubus_complete_request(ctx, &req, 0);
if (ret)
return ret;
if (obj->id)
return UBUS_STATUS_NO_DATA;
return 0;
}