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ubus.c
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ubus.c
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/*
* Copyright (C) 2021 Jo-Philipp Wich <jo@mein.io>
* Copyright (C) 2021 John Crispin <john@phrozen.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "ucrun.h"
static struct blob_buf u;
ucrun_ctx_t *
ctx_to_ucrun(struct ubus_context *ctx)
{
struct ubus_auto_conn *conn = container_of(ctx, struct ubus_auto_conn, ctx);
ucrun_ctx_t *ucrun = container_of(conn, ucrun_ctx_t, ubus_auto_conn);
return ucrun;
}
static uc_value_t *
uc_blob_to_json(uc_vm_t *vm, struct blob_attr *attr, bool table, const char **name);
static uc_value_t *
uc_blob_array_to_json(uc_vm_t *vm, struct blob_attr *attr, size_t len, bool table)
{
uc_value_t *o = table ? ucv_object_new(vm) : ucv_array_new(vm);
uc_value_t *v;
struct blob_attr *pos;
size_t rem = len;
const char *name;
if (!o)
return NULL;
__blob_for_each_attr(pos, attr, rem) {
name = NULL;
v = uc_blob_to_json(vm, pos, table, &name);
if (table && name)
ucv_object_add(o, name, v);
else if (!table)
ucv_array_push(o, v);
else
ucv_put(v);
}
return o;
}
static uc_value_t *
uc_blob_to_json(uc_vm_t *vm, struct blob_attr *attr, bool table, const char **name)
{
void *data;
int len;
if (!blobmsg_check_attr(attr, false))
return NULL;
if (table && blobmsg_name(attr)[0])
*name = blobmsg_name(attr);
data = blobmsg_data(attr);
len = blobmsg_data_len(attr);
switch (blob_id(attr)) {
case BLOBMSG_TYPE_BOOL:
return ucv_boolean_new(*(uint8_t *)data);
case BLOBMSG_TYPE_INT16:
return ucv_int64_new((int16_t)be16_to_cpu(*(uint16_t *)data));
case BLOBMSG_TYPE_INT32:
return ucv_int64_new((int32_t)be32_to_cpu(*(uint32_t *)data));
case BLOBMSG_TYPE_INT64:
return ucv_int64_new((int64_t)be64_to_cpu(*(uint64_t *)data));
case BLOBMSG_TYPE_DOUBLE:
;
union {
double d;
uint64_t u64;
} v;
v.u64 = be64_to_cpu(*(uint64_t *)data);
return ucv_double_new(v.d);
case BLOBMSG_TYPE_STRING:
return ucv_string_new(data);
case BLOBMSG_TYPE_ARRAY:
return uc_blob_array_to_json(vm, data, len, false);
case BLOBMSG_TYPE_TABLE:
return uc_blob_array_to_json(vm, data, len, true);
default:
return NULL;
}
}
static int
ubus_ucode_cb(struct ubus_context *ctx,
struct ubus_object *obj,
struct ubus_request_data *req,
const char *name,
struct blob_attr *msg)
{
ucrun_ctx_t *ucrun = ctx_to_ucrun(ctx);
/* try to find the method */
uc_value_t *methods = ucv_object_get(ucrun->ubus, "methods", NULL);
uc_value_t *method = NULL, *cb, *retval = NULL;
ucv_object_foreach(methods, key, val) {
if (strcmp(key, name))
continue;
method = val;
}
if (!method)
return UBUS_STATUS_METHOD_NOT_FOUND;
/* check if the callback is valid */
cb = ucv_object_get(method, "cb", NULL);
if (!ucv_is_callable(cb))
return UBUS_STATUS_METHOD_NOT_FOUND;
/* push the callback to the stack */
ucv_get(cb);
uc_vm_stack_push(&ucrun->vm, cb);
if (msg)
uc_vm_stack_push(&ucrun->vm,
uc_blob_array_to_json(&ucrun->vm, blob_data(msg), blob_len(msg), true));
/* execute the callback */
if (!uc_vm_call(&ucrun->vm, false, msg ? 1 : 0))
retval = uc_vm_stack_pop(&ucrun->vm);
if (ucv_type(retval) == UC_OBJECT) {
json_object *o;
blob_buf_init(&u, 0);
o = ucv_to_json(retval);
blobmsg_add_object(&u, o);
json_object_put(o);
/* check if we need to send a reply */
if (blobmsg_len(u.head))
ubus_send_reply(ctx, req, u.head);
}
ucv_put(retval);
return UBUS_STATUS_OK;
}
static void
ubus_connect_handler(struct ubus_context *ctx)
{
ucrun_ctx_t *ucrun = ctx_to_ucrun(ctx);
uc_value_t *connect, *retval = NULL;
/* register the ubus object */
ubus_add_object(ctx, &ucrun->ubus_object);
/* check if the user code has a connect handler */
connect = ucv_object_get(ucrun->ubus, "connect", NULL);
if (!ucv_is_callable(connect))
return;
/* push the callback to the stack */
ucv_get(connect);
uc_vm_stack_push(&ucrun->vm, connect);
/* execute the callback */
if (!uc_vm_call(&ucrun->vm, false, 0))
retval = uc_vm_stack_pop(&ucrun->vm);
ucv_put(retval);
}
void
ubus_init(ucrun_ctx_t *ucrun)
{
int n_methods, n = 0;
/* validate that the ubus declaration is complete */
uc_value_t *object = ucv_object_get(ucrun->ubus, "object", NULL);
uc_value_t *methods = ucv_object_get(ucrun->ubus, "methods", NULL);
ucv_get(ucrun->ubus);
if (ucv_type(object) != UC_STRING || ucv_type(methods) != UC_OBJECT) {
fprintf(stderr, "The ubus declaration is incomplete\n");
return;
}
/* create our ubus methods */
n_methods = ucv_object_length(methods);
ucrun->ubus_method = calloc(n_methods, sizeof(struct ubus_method));
ucv_object_foreach(methods, key, val) {
if (!ucv_object_get(val, "cb", NULL))
continue;
ucrun->ubus_method[n].name = key;
ucrun->ubus_method[n].handler = ubus_ucode_cb;
n++;
}
/* setup the ubus object */
ucrun->ubus_name = strdup(ucv_string_get(object));
ucrun->ubus_object_type.name = ucrun->ubus_name;
ucrun->ubus_object_type.methods = ucrun->ubus_method;
ucrun->ubus_object_type.n_methods = n_methods;
ucrun->ubus_object.name = ucrun->ubus_name;
ucrun->ubus_object.type = &ucrun->ubus_object_type;
ucrun->ubus_object.methods = ucrun->ubus_method;
ucrun->ubus_object.n_methods = n_methods;
/* try to connect to ubus */
ucrun->ubus_auto_conn.cb = ubus_connect_handler;
ubus_auto_connect(&ucrun->ubus_auto_conn);
}
void
ubus_deinit(ucrun_ctx_t *ucrun)
{
if (!ucrun->ubus)
return;
/* disconnect from ubus and free the memory */
ubus_auto_shutdown(&ucrun->ubus_auto_conn);
blob_buf_free(&u);
free(ucrun->ubus_name);
free(ucrun->ubus_method);
}