blob: 53b918d4762f6c4f0fcc6170bd9bfd066978811d [file] [log] [blame]
/**
* @file yangdata.c
* @author Radek Krejci <rkrejci@cesnet.cz>
* @author Michal Vasko <mvasko@cesnet.cz>
* @brief libyang extension plugin - yang-data (RFC 8040)
*
* Copyright (c) 2021 - 2022 CESNET, z.s.p.o.
*
* This source code is licensed under BSD 3-Clause License (the "License").
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSD-3-Clause
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "libyang.h"
#include "plugins_exts.h"
static void yangdata_cfree(const struct ly_ctx *ctx, struct lysc_ext_instance *ext);
/**
* @brief Parse yang-data extension instances.
*
* Implementation of ::lyplg_ext_parse_clb callback set as lyext_plugin::parse.
*/
static LY_ERR
yangdata_parse(struct lysp_ctx *pctx, struct lysp_ext_instance *ext)
{
LY_ERR ret;
LY_ARRAY_COUNT_TYPE u;
struct lysp_module *pmod;
/* yang-data can appear only at the top level of a YANG module or submodule */
if ((ext->parent_stmt != LY_STMT_MODULE) && (ext->parent_stmt != LY_STMT_SUBMODULE)) {
lyplg_ext_parse_log(pctx, ext, LY_LLWRN, 0, "Extension %s is ignored since it appears as a non top-level statement "
"in \"%s\" statement.", ext->name, lyplg_ext_stmt2str(ext->parent_stmt));
return LY_ENOT;
}
pmod = ext->parent;
/* check for duplication */
LY_ARRAY_FOR(pmod->exts, u) {
if ((&pmod->exts[u] != ext) && (pmod->exts[u].name == ext->name) && !strcmp(pmod->exts[u].argument, ext->argument)) {
/* duplication of the same yang-data extension in a single module */
lyplg_ext_parse_log(pctx, ext, LY_LLERR, LY_EVALID, "Extension %s is instantiated multiple times.", ext->name);
return LY_EVALID;
}
}
/* parse yang-data substatements */
LY_ARRAY_CREATE_GOTO(lyplg_ext_parse_get_cur_pmod(pctx)->mod->ctx, ext->substmts, 3, ret, emem);
LY_ARRAY_INCREMENT(ext->substmts);
ext->substmts[0].stmt = LY_STMT_CONTAINER;
ext->substmts[0].storage = &ext->parsed;
LY_ARRAY_INCREMENT(ext->substmts);
ext->substmts[1].stmt = LY_STMT_CHOICE;
ext->substmts[1].storage = &ext->parsed;
LY_ARRAY_INCREMENT(ext->substmts);
ext->substmts[2].stmt = LY_STMT_USES;
ext->substmts[2].storage = &ext->parsed;
if ((ret = lyplg_ext_parse_extension_instance(pctx, ext))) {
return ret;
}
return LY_SUCCESS;
emem:
lyplg_ext_parse_log(pctx, ext, LY_LLERR, LY_EMEM, "Memory allocation failed (%s()).", __func__);
return LY_EMEM;
}
/**
* @brief Compile yang-data extension instances.
*
* Implementation of ::lyplg_ext_compile_clb callback set as lyext_plugin::compile.
*/
static LY_ERR
yangdata_compile(struct lysc_ctx *cctx, const struct lysp_ext_instance *extp, struct lysc_ext_instance *ext)
{
LY_ERR ret;
const struct lysc_node *child;
ly_bool valid = 1;
uint32_t prev_options = *lyplg_ext_compile_get_options(cctx);
/* compile yangg-data substatements */
LY_ARRAY_CREATE_GOTO(cctx->ctx, ext->substmts, 3, ret, emem);
LY_ARRAY_INCREMENT(ext->substmts);
ext->substmts[0].stmt = LY_STMT_CONTAINER;
ext->substmts[0].storage = &ext->compiled;
LY_ARRAY_INCREMENT(ext->substmts);
ext->substmts[1].stmt = LY_STMT_CHOICE;
ext->substmts[1].storage = &ext->compiled;
LY_ARRAY_INCREMENT(ext->substmts);
ext->substmts[2].stmt = LY_STMT_USES;
ext->substmts[2].storage = &ext->compiled;
*lyplg_ext_compile_get_options(cctx) |= LYS_COMPILE_NO_CONFIG | LYS_COMPILE_NO_DISABLED;
ret = lyplg_ext_compile_extension_instance(cctx, extp, ext);
*lyplg_ext_compile_get_options(cctx) = prev_options;
if (ret) {
return ret;
}
/* check that we have really just a single container data definition in the top */
child = ext->compiled;
if (!child) {
valid = 0;
lyplg_ext_compile_log(cctx, ext, LY_LLERR, LY_EVALID,
"Extension %s is instantiated without any top level data node, but exactly one container data node is expected.",
extp->name);
} else if (child->next) {
valid = 0;
lyplg_ext_compile_log(cctx, ext, LY_LLERR, LY_EVALID,
"Extension %s is instantiated with multiple top level data nodes, but only a single container data node is allowed.",
extp->name);
} else if (child->nodetype == LYS_CHOICE) {
/* all the choice's case are expected to result to a single container node */
struct lysc_module *mod_c = ext->parent;
const struct lysc_node *snode = NULL;
while ((snode = lys_getnext(snode, child, mod_c, 0))) {
if (snode->next) {
valid = 0;
lyplg_ext_compile_log(cctx, ext, LY_LLERR, LY_EVALID,
"Extension %s is instantiated with multiple top level data nodes (inside a single choice's case), "
"but only a single container data node is allowed.", extp->name);
break;
} else if (snode->nodetype != LYS_CONTAINER) {
valid = 0;
lyplg_ext_compile_log(cctx, ext, LY_LLERR, LY_EVALID,
"Extension %s is instantiated with %s top level data node (inside a choice), "
"but only a single container data node is allowed.", extp->name, lys_nodetype2str(snode->nodetype));
break;
}
}
} else if (child->nodetype != LYS_CONTAINER) {
/* via uses */
valid = 0;
lyplg_ext_compile_log(cctx, ext, LY_LLERR, LY_EVALID,
"Extension %s is instantiated with %s top level data node, but only a single container data node is allowed.",
extp->name, lys_nodetype2str(child->nodetype));
}
if (!valid) {
yangdata_cfree(lyplg_ext_compile_get_ctx(cctx), ext);
ext->compiled = ext->substmts = NULL;
return LY_EVALID;
}
return LY_SUCCESS;
emem:
lyplg_ext_compile_log(cctx, ext, LY_LLERR, LY_EMEM, "Memory allocation failed (%s()).", __func__);
return LY_EMEM;
}
/**
* @brief INFO printer
*
* Implementation of ::lyplg_ext_sprinter_info_clb set as ::lyext_plugin::printer_info
*/
static LY_ERR
yangdata_printer_info(struct lyspr_ctx *ctx, struct lysc_ext_instance *ext, ly_bool *flag)
{
lyplg_ext_print_info_extension_instance(ctx, ext, flag);
return LY_SUCCESS;
}
/**
* @brief Free parsed yang-data extension instance data.
*
* Implementation of ::lyplg_clb_parse_free_clb callback set as lyext_plugin::pfree.
*/
static void
yangdata_pfree(const struct ly_ctx *ctx, struct lysp_ext_instance *ext)
{
lyplg_ext_pfree_instance_substatements(ctx, ext->substmts);
}
/**
* @brief Free compiled yang-data extension instance data.
*
* Implementation of ::lyplg_clb_compile_free_clb callback set as lyext_plugin::cfree.
*/
static void
yangdata_cfree(const struct ly_ctx *ctx, struct lysc_ext_instance *ext)
{
lyplg_ext_cfree_instance_substatements(ctx, ext->substmts);
}
/**
* @brief Plugin descriptions for the yang-data extension
*
* Note that external plugins are supposed to use:
*
* LYPLG_EXTENSIONS = {
*/
const struct lyplg_ext_record plugins_yangdata[] = {
{
.module = "ietf-restconf",
.revision = "2017-01-26",
.name = "yang-data",
.plugin.id = "ly2 yang-data v1",
.plugin.parse = yangdata_parse,
.plugin.compile = yangdata_compile,
.plugin.printer_info = yangdata_printer_info,
.plugin.node = NULL,
.plugin.snode = NULL,
.plugin.validate = NULL,
.plugin.pfree = yangdata_pfree,
.plugin.cfree = yangdata_cfree
},
{0} /* terminating zeroed record */
};