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-rw-r--r--src/plugins_exts/yangdata.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/src/plugins_exts/yangdata.c b/src/plugins_exts/yangdata.c
new file mode 100644
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+++ b/src/plugins_exts/yangdata.c
@@ -0,0 +1,277 @@
+/**
+ * @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 <assert.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "compat.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);
+}
+
+static void
+yangdata_sprinter_node(uint16_t nodetype, const char **flags)
+{
+ if (nodetype & LYS_USES) {
+ *flags = "-u";
+ } else {
+ *flags = "--";
+ }
+}
+
+static LY_ERR
+yangdata_sprinter_cnode(const struct lysc_node *node, const void *UNUSED(plugin_priv), ly_bool *UNUSED(skip),
+ const char **flags, const char **UNUSED(add_opts))
+{
+ yangdata_sprinter_node(node->nodetype, flags);
+ return LY_SUCCESS;
+}
+
+static LY_ERR
+yangdata_sprinter_pnode(const struct lysp_node *node, const void *UNUSED(plugin_priv), ly_bool *UNUSED(skip),
+ const char **flags, const char **UNUSED(add_opts))
+{
+ yangdata_sprinter_node(node->nodetype, flags);
+ return LY_SUCCESS;
+}
+
+static LY_ERR
+yangdata_sprinter_ctree(struct lysc_ext_instance *ext, const struct lyspr_tree_ctx *ctx,
+ const char **UNUSED(flags), const char **UNUSED(add_opts))
+{
+ LY_ERR rc = LY_SUCCESS;
+
+ assert(ctx);
+ rc = lyplg_ext_sprinter_ctree_add_ext_nodes(ctx, ext, yangdata_sprinter_cnode);
+ return rc;
+}
+
+static LY_ERR
+yangdata_sprinter_ptree(struct lysp_ext_instance *ext, const struct lyspr_tree_ctx *ctx,
+ const char **UNUSED(flags), const char **UNUSED(add_opts))
+{
+ LY_ERR rc = LY_SUCCESS;
+
+ assert(ctx);
+ rc = lyplg_ext_sprinter_ptree_add_ext_nodes(ctx, ext, yangdata_sprinter_pnode);
+ return rc;
+}
+
+/**
+ * @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.printer_ctree = yangdata_sprinter_ctree,
+ .plugin.printer_ptree = yangdata_sprinter_ptree,
+ .plugin.node = NULL,
+ .plugin.snode = NULL,
+ .plugin.validate = NULL,
+ .plugin.pfree = yangdata_pfree,
+ .plugin.cfree = yangdata_cfree
+ },
+ {0} /* terminating zeroed record */
+};
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