blob: fada1c2ea9f531f38abc0f852016cc61c72f92e5 [file] [log] [blame]
/**
* @file schema_mount.c
* @author Tadeas Vintrlik <xvintr04@stud.fit.vutbr.cz>
* @brief libyang extension plugin - Schema Mount (RFC 8528)
*
* Copyright (c) 2021 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
*/
#define _GNU_SOURCE
#include <assert.h>
#include <pthread.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "compat.h"
#include "dict.h"
#include "libyang.h"
#include "log.h"
#include "ly_common.h"
#include "parser_data.h"
#include "plugins_exts.h"
#include "plugins_types.h"
#include "tree_data.h"
#include "tree_schema.h"
/**
* @brief Internal schema mount data structure for holding all the contexts of parsed data.
*/
struct lyplg_ext_sm {
pthread_mutex_t lock; /**< lock for accessing this shared structure */
struct lyplg_ext_sm_shared {
struct {
struct ly_ctx *ctx; /**< context shared between all data of this mount point */
const char *mount_point; /**< mount point name */
const char *content_id; /**< yang-library content-id (alternatively module-set-id),
stored in the dictionary of the ext instance context */
} *schemas; /**< array of shared schema schemas */
uint32_t schema_count; /**< length of schemas array */
uint32_t ref_count; /**< number of references to this structure (mount-points with the same name
in the module) */
} *shared; /**< shared schema mount points */
struct lyplg_ext_sm_inln {
struct {
struct ly_ctx *ctx; /**< context created for inline schema data, may be reused if possible */
} *schemas; /**< array of inline schemas */
uint32_t schema_count; /**< length of schemas array */
} inln; /**< inline mount points */
};
struct sprinter_tree_priv {
struct ly_ctx *ext_ctx;
struct ly_set *refs;
};
#define EXT_LOGERR_MEM_RET(cctx, ext) \
lyplg_ext_compile_log(cctx, ext, LY_LLERR, LY_EMEM, "Memory allocation failed (%s:%d).", __FILE__, __LINE__); \
return LY_EMEM
#define EXT_LOGERR_MEM_GOTO(cctx, ext, rc, label) \
lyplg_ext_compile_log(cctx, ext, LY_LLERR, LY_EMEM, "Memory allocation failed (%s:%d).", __FILE__, __LINE__); \
rc = LY_EMEM; \
goto label
#define EXT_LOGERR_INT_RET(cctx, ext) \
lyplg_ext_compile_log(cctx, ext, LY_LLERR, LY_EINT, "Internal error (%s:%d).", __FILE__, __LINE__); \
return LY_EINT
/**
* @brief Check if given mount point is unique among its siblings
*
* @param[in] pctx Parse context.
* @param[in] ext Parsed extension instance.
* @return LY_SUCCESS if is unique;
* @return LY_EINVAL otherwise.
*/
static LY_ERR
schema_mount_parse_unique_mp(struct lysp_ctx *pctx, const struct lysp_ext_instance *ext)
{
struct lysp_ext_instance *exts;
LY_ARRAY_COUNT_TYPE u;
struct lysp_node *parent;
/* check if it is the only instance of the mount-point among its siblings */
parent = ext->parent;
exts = parent->exts;
LY_ARRAY_FOR(exts, u) {
if (&exts[u] == ext) {
continue;
}
if (!strcmp(exts[u].name, ext->name)) {
lyplg_ext_parse_log(pctx, ext, LY_LLERR, LY_EVALID, "Multiple extension \"%s\" instances.", ext->name);
return LY_EINVAL;
}
}
return LY_SUCCESS;
}
/**
* @brief Schema mount parse.
* Checks if it can be a valid extension instance for yang schema mount.
*
* Implementation of ::lyplg_ext_parse_clb callback set as lyext_plugin::parse.
*/
static LY_ERR
schema_mount_parse(struct lysp_ctx *pctx, struct lysp_ext_instance *ext)
{
/* check YANG version 1.1 */
if (lyplg_ext_parse_get_cur_pmod(pctx)->version != LYS_VERSION_1_1) {
lyplg_ext_parse_log(pctx, ext, LY_LLERR, LY_EVALID, "Extension \"%s\" instance not allowed in YANG version 1 module.",
ext->name);
return LY_EINVAL;
}
/* check parent nodetype */
if ((ext->parent_stmt != LY_STMT_CONTAINER) && (ext->parent_stmt != LY_STMT_LIST)) {
lyplg_ext_parse_log(pctx, ext, LY_LLERR, LY_EVALID, "Extension \"%s\" instance allowed only in container or list statement.",
ext->name);
return LY_EINVAL;
}
/* check uniqueness */
if (schema_mount_parse_unique_mp(pctx, ext)) {
return LY_EINVAL;
}
/* nothing to actually parse */
return LY_SUCCESS;
}
struct lyplg_ext_sm_shared_cb_data {
const struct lysc_ext_instance *ext;
struct lyplg_ext_sm_shared *sm_shared;
};
static LY_ERR
schema_mount_compile_mod_dfs_cb(struct lysc_node *node, void *data, ly_bool *UNUSED(dfs_continue))
{
struct lyplg_ext_sm_shared_cb_data *cb_data = data;
struct lyplg_ext_sm *sm_data;
struct lysc_ext_instance *exts;
LY_ARRAY_COUNT_TYPE u;
if (node == cb_data->ext->parent) {
/* parent of the current compiled extension, skip */
return LY_SUCCESS;
}
/* find the same mount point */
exts = node->exts;
LY_ARRAY_FOR(exts, u) {
if (!strcmp(exts[u].def->module->name, "ietf-yang-schema-mount") && !strcmp(exts[u].def->name, "mount-point") &&
(exts[u].argument == cb_data->ext->argument)) {
/* same mount point, break the DFS search */
sm_data = exts[u].compiled;
cb_data->sm_shared = sm_data->shared;
return LY_EEXIST;
}
}
/* not found, continue search */
return LY_SUCCESS;
}
static struct lyplg_ext_sm_shared *
schema_mount_compile_find_shared(const struct lys_module *mod, const struct lysc_ext_instance *ext)
{
struct lyplg_ext_sm_shared_cb_data cb_data;
LY_ERR r;
/* prepare cb_data */
cb_data.ext = ext;
cb_data.sm_shared = NULL;
/* try to find the same mount point */
r = lysc_module_dfs_full(mod, schema_mount_compile_mod_dfs_cb, &cb_data);
(void)r;
assert((!r && !cb_data.sm_shared) || ((r == LY_EEXIST) && cb_data.sm_shared));
return cb_data.sm_shared;
}
/**
* @brief Schema mount compile.
* Checks if it can be a valid extension instance for yang schema mount.
*
* Implementation of ::lyplg_ext_compile_clb callback set as lyext_plugin::compile.
*/
static LY_ERR
schema_mount_compile(struct lysc_ctx *cctx, const struct lysp_ext_instance *UNUSED(extp), struct lysc_ext_instance *ext)
{
const struct lysc_node *node;
struct lyplg_ext_sm *sm_data;
/* init internal data */
sm_data = calloc(1, sizeof *sm_data);
if (!sm_data) {
EXT_LOGERR_MEM_RET(cctx, ext);
}
pthread_mutex_init(&sm_data->lock, NULL);
ext->compiled = sm_data;
/* find the owner module */
node = ext->parent;
while (node->parent) {
node = node->parent;
}
/* reuse/init shared schema */
sm_data->shared = schema_mount_compile_find_shared(node->module, ext);
if (sm_data->shared) {
++sm_data->shared->ref_count;
} else {
sm_data->shared = calloc(1, sizeof *sm_data->shared);
if (!sm_data->shared) {
free(sm_data);
EXT_LOGERR_MEM_RET(cctx, ext);
}
sm_data->shared->ref_count = 1;
}
return LY_SUCCESS;
}
/**
* @brief Learn details about the current mount point.
*
* @param[in] ext Compiled extension instance.
* @param[in] ext_data Extension data retrieved by the callback.
* @param[out] config Whether the whole schema should keep its config or be set to false.
* @param[out] shared Optional flag whether the schema is shared or inline.
* @return LY_ERR value.
*/
static LY_ERR
schema_mount_get_smount(const struct lysc_ext_instance *ext, const struct lyd_node *ext_data, ly_bool *config,
ly_bool *shared)
{
struct lyd_node *mpoint, *node;
char *path = NULL;
LY_ERR r;
/* find the mount point */
if (asprintf(&path, "/ietf-yang-schema-mount:schema-mounts/mount-point[module='%s'][label='%s']", ext->module->name,
ext->argument) == -1) {
EXT_LOGERR_MEM_RET(NULL, ext);
}
r = ext_data ? lyd_find_path(ext_data, path, 0, &mpoint) : LY_ENOTFOUND;
free(path);
if (r) {
/* missing mount-point, cannot be data for this extension (https://datatracker.ietf.org/doc/html/rfc8528#page-10) */
return LY_ENOT;
}
/* check config */
*config = 1;
if (!lyd_find_path(mpoint, "config", 0, &node) && !strcmp(lyd_get_value(node), "false")) {
*config = 0;
}
assert((ext->parent_stmt == LY_STMT_CONTAINER) || (ext->parent_stmt == LY_STMT_LIST));
if (((struct lysc_node *)ext->parent)->flags & LYS_CONFIG_R) {
*config = 0;
}
if (shared) {
/* check schema-ref */
if (lyd_find_path(mpoint, "shared-schema", 0, NULL)) {
if (lyd_find_path(mpoint, "inline", 0, NULL)) {
EXT_LOGERR_INT_RET(NULL, ext);
}
*shared = 0;
} else {
*shared = 1;
}
}
return LY_SUCCESS;
}
/**
* @brief Create schema (context) based on retrieved extension data.
*
* @param[in] ext Compiled extension instance.
* @param[in] ext_data Extension data retrieved by the callback.
* @param[in] config Whether the whole schema should keep its config or be set to false.
* @param[out] ext_ctx Schema to use for parsing the data.
* @return LY_ERR value.
*/
static LY_ERR
schema_mount_create_ctx(const struct lysc_ext_instance *ext, const struct lyd_node *ext_data, ly_bool config,
struct ly_ctx **ext_ctx)
{
LY_ERR rc = LY_SUCCESS;
const char * const *searchdirs;
char *sdirs = NULL;
const struct lys_module *mod;
struct lysc_node *root, *node;
uint32_t i, idx = 0;
/* get searchdirs from the current context */
searchdirs = ly_ctx_get_searchdirs(ext->module->ctx);
if (searchdirs) {
/* append them all into a single string */
for (i = 0; searchdirs[i]; ++i) {
if ((rc = ly_strcat(&sdirs, "%s" PATH_SEPARATOR, searchdirs[i]))) {
goto cleanup;
}
}
}
/* create the context based on the data */
if ((rc = ly_ctx_new_yldata(sdirs, ext_data, ly_ctx_get_options(ext->module->ctx), ext_ctx))) {
lyplg_ext_compile_log(NULL, ext, LY_LLERR, rc, "Failed to create context for the schema-mount data.");
goto cleanup;
}
if (!config) {
/* manually change the config of all schema nodes in all the modules */
while ((mod = ly_ctx_get_module_iter(*ext_ctx, &idx))) {
if (!mod->implemented) {
continue;
}
LY_LIST_FOR(mod->compiled->data, root) {
LYSC_TREE_DFS_BEGIN(root, node) {
node->flags &= ~LYS_CONFIG_W;
node->flags |= LYS_CONFIG_R;
LYSC_TREE_DFS_END(root, node);
}
}
}
}
cleanup:
free(sdirs);
return rc;
}
/**
* @brief Get ietf-yang-library context-id from its data.
*
* @param[in] ext Compiled extension instance for logging.
* @param[in] ext_data Extension data retrieved by the callback with the yang-library data.
* @param[out] content_id Content ID in @p ext_data.
* @return LY_ERR value.
*/
static LY_ERR
schema_mount_get_content_id(struct lysc_ext_instance *ext, const struct lyd_node *ext_data, const char **content_id)
{
struct lyd_node *node = NULL;
*content_id = NULL;
/* get yang-library content-id or module-set-id */
if (ext_data) {
lyd_find_path(ext_data, "/ietf-yang-library:yang-library/content-id", 0, &node);
if (!node) {
lyd_find_path(ext_data, "/ietf-yang-library:modules-state/module-set-id", 0, &node);
}
if (node) {
*content_id = lyd_get_value(node);
}
}
if (!*content_id) {
lyplg_ext_compile_log(NULL, ext, LY_LLERR, LY_EVALID,
"Missing \"content-id\" or \"module-set-id\" in ietf-yang-library data.");
return LY_EVALID;
}
return LY_SUCCESS;
}
/**
* @brief Get schema (context) for a shared-schema mount point.
*
* @param[in] ext Compiled extension instance.
* @param[in] ext_data Extension data retrieved by the callback.
* @param[in] config Whether the whole schema should keep its config or be set to false.
* @param[out] ext_ctx Schema to use for parsing the data.
* @return LY_ERR value.
*/
static LY_ERR
schema_mount_get_ctx_shared(struct lysc_ext_instance *ext, const struct lyd_node *ext_data, ly_bool config,
const struct ly_ctx **ext_ctx)
{
struct lyplg_ext_sm *sm_data = ext->compiled;
LY_ERR rc = LY_SUCCESS, r;
struct ly_ctx *new_ctx = NULL;
uint32_t i;
const char *content_id;
void *mem;
assert(sm_data && sm_data->shared);
/* get yang-library content-id or module-set-id */
if ((r = schema_mount_get_content_id(ext, ext_data, &content_id))) {
return r;
}
/* LOCK */
if ((r = pthread_mutex_lock(&sm_data->lock))) {
lyplg_ext_compile_log(NULL, ext, LY_LLERR, LY_ESYS, "Mutex lock failed (%s).", strerror(r));
return LY_ESYS;
}
/* try to find this mount point */
for (i = 0; i < sm_data->shared->schema_count; ++i) {
if (ext->argument == sm_data->shared->schemas[i].mount_point) {
break;
}
}
if (i < sm_data->shared->schema_count) {
/* schema exists already */
if (strcmp(content_id, sm_data->shared->schemas[i].content_id)) {
lyplg_ext_compile_log_path("/ietf-yang-library:yang-library/content-id", ext, LY_LLERR, LY_EVALID,
"Shared-schema yang-library content-id \"%s\" differs from \"%s\" used previously.",
content_id, sm_data->shared->schemas[i].content_id);
rc = LY_EVALID;
goto cleanup;
}
} else {
/* no schema found, create it */
if ((r = schema_mount_create_ctx(ext, ext_data, config, &new_ctx))) {
rc = r;
goto cleanup;
}
/* new entry */
mem = realloc(sm_data->shared->schemas, (i + 1) * sizeof *sm_data->shared->schemas);
if (!mem) {
ly_ctx_destroy(new_ctx);
EXT_LOGERR_MEM_GOTO(NULL, ext, rc, cleanup);
}
sm_data->shared->schemas = mem;
++sm_data->shared->schema_count;
/* fill entry */
sm_data->shared->schemas[i].ctx = new_ctx;
sm_data->shared->schemas[i].mount_point = ext->argument;
lydict_insert(ext->module->ctx, content_id, 0, &sm_data->shared->schemas[i].content_id);
}
/* use the context */
*ext_ctx = sm_data->shared->schemas[i].ctx;
cleanup:
/* UNLOCK */
pthread_mutex_unlock(&sm_data->lock);
return rc;
}
/**
* @brief Check whether ietf-yang-library data describe an existing context meaning whether it includes
* at least exactly all the mentioned modules.
*
* @param[in] ext Compiled extension instance for logging.
* @param[in] ext_data Extension data retrieved by the callback with the yang-library data.
* @param[in] ctx Context to consider.
* @return LY_SUCCESS if the context matches.
* @return LY_ENOT if the context differs.
* @return LY_ERR on error.
*/
static LY_ERR
schema_mount_ctx_match(struct lysc_ext_instance *ext, const struct lyd_node *ext_data, const struct ly_ctx *ctx)
{
struct ly_set *impl_mods = NULL, *imp_mods = NULL;
struct lyd_node *node;
const struct lys_module *mod;
const char *name, *revision;
LY_ERR rc = LY_ENOT, r;
uint32_t i;
/* collect all the implemented and imported modules, we do not really care about content-id */
if (!lyd_find_path(ext_data, "/ietf-yang-library:yang-library/content-id", 0, NULL)) {
if ((r = lyd_find_xpath(ext_data, "/ietf-yang-library:yang-library/module-set[1]/module", &impl_mods))) {
rc = r;
goto cleanup;
}
if ((r = lyd_find_xpath(ext_data, "/ietf-yang-library:yang-library/module-set[1]/import-only-module", &imp_mods))) {
rc = r;
goto cleanup;
}
} else {
if ((r = lyd_find_xpath(ext_data, "/ietf-yang-library:modules-state/module[conformance-type='implement']", &impl_mods))) {
rc = r;
goto cleanup;
}
if ((r = lyd_find_xpath(ext_data, "/ietf-yang-library:modules-state/module[conformance-type='import']", &imp_mods))) {
rc = r;
goto cleanup;
}
}
if (!impl_mods->count) {
lyplg_ext_compile_log(NULL, ext, LY_LLERR, LY_EVALID, "No implemented modules included in ietf-yang-library data.");
rc = LY_EVALID;
goto cleanup;
}
/* check all the implemented modules */
for (i = 0; i < impl_mods->count; ++i) {
lyd_find_path(impl_mods->dnodes[i], "name", 0, &node);
name = lyd_get_value(node);
lyd_find_path(impl_mods->dnodes[i], "revision", 0, &node);
if (node && strlen(lyd_get_value(node))) {
revision = lyd_get_value(node);
} else {
revision = NULL;
}
if (!(mod = ly_ctx_get_module(ctx, name, revision)) || !mod->implemented) {
/* unsuitable module */
goto cleanup;
}
}
/* check all the imported modules */
for (i = 0; i < imp_mods->count; ++i) {
lyd_find_path(imp_mods->dnodes[i], "name", 0, &node);
name = lyd_get_value(node);
lyd_find_path(imp_mods->dnodes[i], "revision", 0, &node);
if (node && strlen(lyd_get_value(node))) {
revision = lyd_get_value(node);
} else {
revision = NULL;
}
if (!ly_ctx_get_module(ctx, name, revision)) {
/* unsuitable module */
goto cleanup;
}
}
/* context matches and can be reused */
rc = LY_SUCCESS;
cleanup:
ly_set_free(impl_mods, NULL);
ly_set_free(imp_mods, NULL);
return rc;
}
/**
* @brief Get schema (context) for an inline mount point.
*
* @param[in] ext Compiled extension instance.
* @param[in] ext_data Extension data retrieved by the callback.
* @param[in] config Whether the whole schema should keep its config or be set to false.
* @param[out] ext_ctx Schema to use for parsing the data.
* @return LY_ERR value.
*/
static LY_ERR
schema_mount_get_ctx_inline(struct lysc_ext_instance *ext, const struct lyd_node *ext_data, ly_bool config,
const struct ly_ctx **ext_ctx)
{
struct lyplg_ext_sm *sm_data = ext->compiled;
struct ly_ctx *new_ctx = NULL;
uint32_t i;
void *mem;
LY_ERR rc = LY_SUCCESS, r;
assert(sm_data && sm_data->shared);
/* LOCK */
if ((r = pthread_mutex_lock(&sm_data->lock))) {
lyplg_ext_compile_log(NULL, ext, LY_LLERR, LY_ESYS, "Mutex lock failed (%s).", strerror(r));
return LY_ESYS;
}
/* try to find a context we can reuse */
for (i = 0; i < sm_data->inln.schema_count; ++i) {
r = schema_mount_ctx_match(ext, ext_data, sm_data->inln.schemas[i].ctx);
if (!r) {
/* match */
*ext_ctx = sm_data->inln.schemas[i].ctx;
goto cleanup;
} else if (r != LY_ENOT) {
/* error */
rc = r;
goto cleanup;
}
}
/* new schema required, create context */
if ((r = schema_mount_create_ctx(ext, ext_data, config, &new_ctx))) {
rc = r;
goto cleanup;
}
/* new entry */
mem = realloc(sm_data->inln.schemas, (i + 1) * sizeof *sm_data->inln.schemas);
if (!mem) {
ly_ctx_destroy(new_ctx);
EXT_LOGERR_MEM_GOTO(NULL, ext, rc, cleanup);
}
sm_data->inln.schemas = mem;
++sm_data->inln.schema_count;
/* fill entry */
sm_data->inln.schemas[i].ctx = new_ctx;
/* use the context */
*ext_ctx = sm_data->inln.schemas[i].ctx;
cleanup:
/* UNLOCK */
pthread_mutex_unlock(&sm_data->lock);
return rc;
}
/**
* @brief Get schema (context) for a mount point.
*
* @param[in] ext Compiled extension instance.
* @param[out] ext_ctx Schema to use for parsing the data.
* @return LY_ERR value.
*/
static LY_ERR
schema_mount_get_ctx(struct lysc_ext_instance *ext, const struct ly_ctx **ext_ctx)
{
LY_ERR ret = LY_SUCCESS, r;
struct lyd_node *iter, *ext_data = NULL;
ly_bool ext_data_free = 0, config, shared;
*ext_ctx = NULL;
/* get operational data with ietf-yang-library and ietf-yang-schema-mount data */
if ((r = lyplg_ext_get_data(ext->module->ctx, ext, (void **)&ext_data, &ext_data_free))) {
ret = r;
goto cleanup;
}
LY_LIST_FOR(ext_data, iter) {
if (iter->flags & LYD_NEW) {
/* must be validated for the parent-reference prefix data to be stored */
lyplg_ext_compile_log(NULL, ext, LY_LLERR, LY_EINVAL, "Provided ext data have not been validated.");
ret = LY_EINVAL;
goto cleanup;
}
}
/* learn about this mount point */
if ((r = schema_mount_get_smount(ext, ext_data, &config, &shared))) {
ret = r;
goto cleanup;
}
/* create/get the context for parsing the data */
if (shared) {
r = schema_mount_get_ctx_shared(ext, ext_data, config, ext_ctx);
} else {
r = schema_mount_get_ctx_inline(ext, ext_data, config, ext_ctx);
}
if (r) {
ret = r;
goto cleanup;
}
cleanup:
if (ext_data_free) {
lyd_free_all(ext_data);
}
return ret;
}
/**
* @brief Snode callback for schema mount.
* Check if data are valid for schema mount and returns their schema node.
*/
static LY_ERR
schema_mount_snode(struct lysc_ext_instance *ext, const struct lyd_node *parent, const struct lysc_node *sparent,
const char *prefix, size_t prefix_len, LY_VALUE_FORMAT format, void *prefix_data, const char *name, size_t name_len,
const struct lysc_node **snode)
{
LY_ERR r;
const struct lys_module *mod;
const struct ly_ctx *ext_ctx = NULL;
/* get context based on ietf-yang-library data */
if ((r = schema_mount_get_ctx(ext, &ext_ctx))) {
return r;
}
/* get the module */
mod = lyplg_type_identity_module(ext_ctx, parent ? parent->schema : sparent, prefix, prefix_len, format, prefix_data);
if (!mod) {
return LY_ENOT;
}
/* get the top-level schema node */
*snode = lys_find_child(NULL, mod, name, name_len, 0, 0);
return *snode ? LY_SUCCESS : LY_ENOT;
}
static LY_ERR
schema_mount_get_parent_ref(const struct lysc_ext_instance *ext, const struct lyd_node *ext_data,
struct ly_set **set)
{
LY_ERR ret = LY_SUCCESS;
char *path = NULL;
/* get all parent references of this mount point */
if (asprintf(&path, "/ietf-yang-schema-mount:schema-mounts/mount-point[module='%s'][label='%s']"
"/shared-schema/parent-reference", ext->module->name, ext->argument) == -1) {
EXT_LOGERR_MEM_GOTO(NULL, ext, ret, cleanup);
}
if ((ret = lyd_find_xpath(ext_data, path, set))) {
goto cleanup;
}
cleanup:
free(path);
return ret;
}
/**
* @brief Duplicate all accessible parent references for a shared-schema mount point.
*
* @param[in] ext Compiled extension instance.
* @param[in] ctx_node Context node for evaluating the parent-reference XPath expressions.
* @param[in] ext_data Extension data retrieved by the callback.
* @param[in] trg_ctx Mounted data context to use for duplication.
* @param[out] ref_set Set of all top-level parent-ref subtrees connected to each other, may be empty.
* @return LY_ERR value.
*/
static LY_ERR
schema_mount_dup_parent_ref(const struct lysc_ext_instance *ext, const struct lyd_node *ctx_node,
const struct lyd_node *ext_data, const struct ly_ctx *trg_ctx, struct ly_set **ref_set)
{
LY_ERR ret = LY_SUCCESS;
char *path = NULL;
struct ly_set *set = NULL, *par_set = NULL;
struct lyd_node_term *term;
struct lyd_node *dup = NULL, *top_node, *first;
struct lyd_value_xpath10 *xp_val;
uint32_t i, j;
*ref_set = NULL;
if (!ext_data) {
/* we expect the same ext data as before and there must be some for data to be parsed */
lyplg_ext_compile_log(NULL, ext, LY_LLERR, LY_EINVAL, "No ext data provided.");
ret = LY_EINVAL;
goto cleanup;
}
if ((ret = schema_mount_get_parent_ref(ext, ext_data, &set))) {
goto cleanup;
}
/* prepare result set */
if ((ret = ly_set_new(ref_set))) {
goto cleanup;
}
first = NULL;
for (i = 0; i < set->count; ++i) {
term = set->objs[i];
/* get the referenced nodes (subtrees) */
LYD_VALUE_GET(&term->value, xp_val);
if ((ret = lyd_find_xpath3(ctx_node, ctx_node, lyxp_get_expr(xp_val->exp), xp_val->format, xp_val->prefix_data,
NULL, &par_set))) {
lyplg_ext_compile_log(NULL, ext, LY_LLERR, ret, "Parent reference \"%s\" evaluation failed.",
lyxp_get_expr(xp_val->exp));
goto cleanup;
}
for (j = 0; j < par_set->count; ++j) {
/* duplicate with parents in the context of the mounted data */
if ((ret = lyd_dup_single_to_ctx(par_set->dnodes[j], trg_ctx, NULL,
LYD_DUP_RECURSIVE | LYD_DUP_WITH_PARENTS | LYD_DUP_WITH_FLAGS | LYD_DUP_NO_EXT, &dup))) {
goto cleanup;
}
/* go top-level */
while (dup->parent) {
dup = lyd_parent(dup);
}
/* check whether the top-level node exists */
if (first) {
if ((ret = lyd_find_sibling_first(first, dup, &top_node)) && (ret != LY_ENOTFOUND)) {
goto cleanup;
}
} else {
top_node = NULL;
}
if (top_node) {
/* merge */
ret = lyd_merge_tree(&first, dup, LYD_MERGE_DESTRUCT);
dup = NULL;
if (ret) {
goto cleanup;
}
} else {
/* insert */
if ((ret = lyd_insert_sibling(first, dup, &first))) {
goto cleanup;
}
/* add into the result set because a new top-level node was added */
if ((ret = ly_set_add(*ref_set, dup, 1, NULL))) {
goto cleanup;
}
dup = NULL;
}
}
}
cleanup:
free(path);
ly_set_free(set, NULL);
ly_set_free(par_set, NULL);
lyd_free_tree(dup);
if (ret && *ref_set) {
if ((*ref_set)->count) {
lyd_free_siblings((*ref_set)->dnodes[0]);
}
ly_set_free(*ref_set, NULL);
*ref_set = NULL;
}
return ret;
}
LY_ERR
lyplg_ext_schema_mount_get_parent_ref(const struct lysc_ext_instance *ext, struct ly_set **refs)
{
LY_ERR rc;
struct ly_set *pref_set = NULL;
struct ly_set *snode_set = NULL;
struct ly_set *results_set = NULL;
struct lyd_node *ext_data;
ly_bool ext_data_free;
/* get operational data with ietf-yang-library and ietf-yang-schema-mount data */
if ((rc = lyplg_ext_get_data(ext->module->ctx, ext, (void **)&ext_data, &ext_data_free))) {
return rc;
}
LY_CHECK_GOTO(rc = schema_mount_get_parent_ref(ext, ext_data, &pref_set), cleanup);
if (pref_set->count == 0) {
goto cleanup;
}
LY_CHECK_GOTO(rc = ly_set_new(&results_set), cleanup);
for (uint32_t i = 0; i < pref_set->count; ++i) {
struct lyd_node_term *term;
struct lyd_value_xpath10 *xp_val;
char *value;
struct ly_err_item *err;
term = (struct lyd_node_term *)pref_set->dnodes[i];
LYD_VALUE_GET(&term->value, xp_val);
LY_CHECK_GOTO(rc = lyplg_type_print_xpath10_value(xp_val, LY_VALUE_JSON, NULL, &value, &err), cleanup);
LY_CHECK_ERR_GOTO(rc = lys_find_xpath(ext->module->ctx, NULL, value, 0, &snode_set), free(value), cleanup);
free(value);
for (uint32_t sn = 0; sn < snode_set->count; sn++) {
LY_CHECK_GOTO(rc = ly_set_add(results_set, snode_set->snodes[sn], 0, NULL), cleanup);
}
ly_set_free(snode_set, NULL);
snode_set = NULL;
}
*refs = results_set;
cleanup:
if (rc) {
ly_set_free(results_set, NULL);
}
ly_set_free(snode_set, NULL);
if (ext_data_free) {
lyd_free_all(ext_data);
}
ly_set_free(pref_set, NULL);
return rc;
}
/**
* @brief Validate callback for schema mount.
*/
static LY_ERR
schema_mount_validate(struct lysc_ext_instance *ext, struct lyd_node *sibling, const struct lyd_node *dep_tree,
enum lyd_type data_type, uint32_t val_opts, struct lyd_node **diff)
{
LY_ERR ret = LY_SUCCESS;
uint32_t *prev_lo, temp_lo = LY_LOSTORE_LAST, i;
struct ly_err_item *err;
struct lyd_node *iter, *ext_data = NULL, *ref_first = NULL, *orig_parent = lyd_parent(sibling), *op_tree;
struct lyd_node *ext_diff = NULL, *diff_parent = NULL;
ly_bool ext_data_free = 0;
struct ly_set *ref_set = NULL;
if (!sibling) {
/* some data had to be parsed for this callback to be called */
EXT_LOGERR_INT_RET(NULL, ext);
}
/* get operational data with ietf-yang-library and ietf-yang-schema-mount data */
if ((ret = lyplg_ext_get_data(ext->module->ctx, ext, (void **)&ext_data, &ext_data_free))) {
goto cleanup;
}
LY_LIST_FOR(ext_data, iter) {
if (iter->flags & LYD_NEW) {
/* must be validated for the parent-reference prefix data to be stored */
lyplg_ext_compile_log(NULL, ext, LY_LLERR, LY_EINVAL, "Provided ext data have not been validated.");
ret = LY_EINVAL;
goto cleanup;
}
}
/* duplicate the referenced parent nodes into ext context */
if ((ret = schema_mount_dup_parent_ref(ext, orig_parent, ext_data, LYD_CTX(sibling), &ref_set))) {
goto cleanup;
}
if (data_type != LYD_TYPE_DATA_YANG) {
/* remember the operation data tree, it may be moved */
op_tree = sibling;
}
/* create accessible tree, remove LYD_EXT to not call this callback recursively */
lyd_unlink_siblings(sibling);
LY_LIST_FOR(sibling, iter) {
iter->flags &= ~LYD_EXT;
}
if (ref_set->count) {
if ((ret = lyd_insert_sibling(sibling, ref_set->dnodes[0], &sibling))) {
goto cleanup;
}
}
/* only store messages in the context, log as an extension */
prev_lo = ly_temp_log_options(&temp_lo);
if (data_type == LYD_TYPE_DATA_YANG) {
/* validate all the modules with data */
ret = lyd_validate_all(&sibling, NULL, val_opts | LYD_VALIDATE_PRESENT, diff ? &ext_diff : NULL);
} else {
/* validate the operation */
ret = lyd_validate_op(op_tree, dep_tree, data_type, diff ? &ext_diff : NULL);
}
/* restore logging */
ly_temp_log_options(prev_lo);
/* restore sibling tree */
for (i = 0; i < ref_set->count; ++i) {
if (ref_set->dnodes[i] == sibling) {
sibling = sibling->next;
}
lyd_free_tree(ref_set->dnodes[i]);
}
LY_LIST_FOR(sibling, iter) {
iter->flags |= LYD_EXT;
}
lyplg_ext_insert(orig_parent, sibling);
if (ret) {
/* log the error in the original context */
err = ly_err_first(LYD_CTX(sibling));
if (!err) {
lyplg_ext_compile_log(NULL, ext, LY_LLERR, ret, "Unknown validation error (err code %d).", ret);
} else {
lyplg_ext_compile_log_err(err, ext);
}
goto cleanup;
}
/* create proper diff */
if (diff && ext_diff) {
/* diff nodes from an extension instance */
LY_LIST_FOR(ext_diff, iter) {
iter->flags |= LYD_EXT;
}
/* create the parent and insert the diff */
if ((ret = lyd_dup_single(lyd_parent(sibling), NULL, LYD_DUP_WITH_PARENTS | LYD_DUP_NO_META, &diff_parent))) {
goto cleanup;
}
if ((ret = lyplg_ext_insert(diff_parent, ext_diff))) {
goto cleanup;
}
ext_diff = NULL;
/* go top-level and set the operation */
while (lyd_parent(diff_parent)) {
diff_parent = lyd_parent(diff_parent);
}
if ((ret = lyd_new_meta(LYD_CTX(diff_parent), diff_parent, NULL, "yang:operation", "none", 0, NULL))) {
goto cleanup;
}
/* finally merge into the global diff */
if ((ret = lyd_diff_merge_all(diff, diff_parent, LYD_DIFF_MERGE_DEFAULTS))) {
goto cleanup;
}
}
cleanup:
ly_set_free(ref_set, NULL);
lyd_free_siblings(ref_first);
lyd_free_tree(ext_diff);
lyd_free_all(diff_parent);
if (ext_data_free) {
lyd_free_all(ext_data);
}
return ret;
}
/**
* @brief Schema mount compile free.
*
* Implementation of ::lyplg_ext_compile_free_clb callback set as ::lyext_plugin::cfree.
*/
static void
schema_mount_cfree(const struct ly_ctx *ctx, struct lysc_ext_instance *ext)
{
struct lyplg_ext_sm *sm_data = ext->compiled;
uint32_t i;
if (!sm_data) {
return;
}
if (!--sm_data->shared->ref_count) {
for (i = 0; i < sm_data->shared->schema_count; ++i) {
ly_ctx_destroy(sm_data->shared->schemas[i].ctx);
lydict_remove(ctx, sm_data->shared->schemas[i].content_id);
}
free(sm_data->shared->schemas);
free(sm_data->shared);
}
for (i = 0; i < sm_data->inln.schema_count; ++i) {
ly_ctx_destroy(sm_data->inln.schemas[i].ctx);
}
free(sm_data->inln.schemas);
pthread_mutex_destroy(&sm_data->lock);
free(sm_data);
}
LIBYANG_API_DEF LY_ERR
lyplg_ext_schema_mount_create_context(const struct lysc_ext_instance *ext, struct ly_ctx **ctx)
{
struct lyd_node *ext_data = NULL;
ly_bool ext_data_free = 0, config;
LY_ERR rc = LY_SUCCESS;
if (!ext->module->ctx->ext_clb) {
return LY_EINVAL;
}
if (strcmp(ext->def->module->name, "ietf-yang-schema-mount") || strcmp(ext->def->name, "mount-point")) {
return LY_EINVAL;
}
/* get operational data with ietf-yang-library and ietf-yang-schema-mount data */
if ((rc = lyplg_ext_get_data(ext->module->ctx, ext, (void **)&ext_data, &ext_data_free))) {
return rc;
}
/* learn about this mount point */
if ((rc = schema_mount_get_smount(ext, ext_data, &config, NULL))) {
goto cleanup;
}
/* create the context */
rc = schema_mount_create_ctx(ext, ext_data, config, ctx);
cleanup:
if (ext_data_free) {
lyd_free_all(ext_data);
}
return rc;
}
static void
schema_mount_spriter_tree_free(void *priv)
{
struct sprinter_tree_priv *st_priv;
st_priv = priv;
ly_set_free(st_priv->refs, NULL);
ly_ctx_destroy(st_priv->ext_ctx);
free(st_priv);
}
static LY_ERR
schema_mount_sprinter_tree_cnode_override_mounted(const struct lysc_node *node, const void *UNUSED(plugin_priv),
ly_bool *UNUSED(skip), const char **UNUSED(flags), const char **add_opts)
{
if (!node->parent) {
*add_opts = "/";
}
return LY_SUCCESS;
}
static LY_ERR
schema_mount_sprinter_tree_pnode_override_mounted(const struct lysp_node *node, const void *UNUSED(plugin_priv),
ly_bool *UNUSED(skip), const char **UNUSED(flags), const char **add_opts)
{
if (!node->parent) {
*add_opts = "/";
}
return LY_SUCCESS;
}
static LY_ERR
schema_mount_sprinter_tree_node_override_parent_refs(const struct lysc_node *node, const void *plugin_priv,
ly_bool *skip, const char **UNUSED(flags), const char **add_opts)
{
uint32_t i;
const struct ly_set *refs;
const struct lysc_module *mod;
struct lysc_node *ref, *iter;
refs = ((struct sprinter_tree_priv *)plugin_priv)->refs;
mod = node->module->compiled;
/* Assume the @p node will be skipped. */
*skip = 1;
for (i = 0; (i < refs->count) && *skip; i++) {
ref = refs->snodes[i];
if (ref->module->compiled != mod) {
/* parent-reference points to different module */
continue;
}
for (iter = ref; iter; iter = iter->parent) {
if (iter == node) {
/* @p node is not skipped because it is parent-rererence node or his parent */
*skip = 0;
break;
}
}
}
if (!*skip && !node->parent) {
/* top-node has additional opts */
*add_opts = "@";
}
return LY_SUCCESS;
}
/**
* @brief Schema mount schema parsed tree printer.
*
* Implementation of ::lyplg_ext_sprinter_ptree_clb callback set as lyext_plugin::printer_ptree.
*/
static LY_ERR
schema_mount_sprinter_ptree(struct lysp_ext_instance *UNUSED(ext), const struct lyspr_tree_ctx *ctx,
const char **flags, const char **UNUSED(add_opts))
{
if (!ctx) {
*flags = "mp";
}
return LY_SUCCESS;
}
/**
* @brief Schema mount schema compiled tree printer.
*
* Implementation of ::lyplg_ext_sprinter_ctree_clb callback set as lyext_plugin::printer_ctree.
*/
static LY_ERR
schema_mount_sprinter_ctree(struct lysc_ext_instance *ext, const struct lyspr_tree_ctx *ctx,
const char **flags, const char **UNUSED(add_opts))
{
LY_ERR rc = LY_SUCCESS;
struct ly_ctx *ext_ctx = NULL;
const struct lys_module *mod;
struct ly_set *refs = NULL;
struct lysc_node *tree1, *tree2;
uint32_t i, j;
ly_bool from_parent_ref, is_first;
struct sprinter_tree_priv *st_priv;
if (!ctx) {
*flags = "mp";
return LY_SUCCESS;
}
if (lyplg_ext_schema_mount_create_context(ext, &ext_ctx)) {
/* Void mount point */
return LY_SUCCESS;
}
rc = lyplg_ext_schema_mount_get_parent_ref(ext, &refs);
LY_CHECK_GOTO(rc, cleanup);
/* build new list of modules to print. This list will omit internal
* modules, modules with no nodes (e.g., iana-if-types) and modules
* that were loaded as the result of a parent-reference.
*/
i = ly_ctx_internal_modules_count(ext_ctx);
while ((mod = ly_ctx_get_module_iter(ext_ctx, &i))) {
from_parent_ref = 0;
for (j = 0; refs && j < refs->count; j++) {
if (!strcmp(mod->ns, refs->snodes[j]->module->ns)) {
from_parent_ref = 1;
break;
}
}
if (from_parent_ref) {
/* Modules loaded as the result of a parent-reference are added later. */
continue;
}
/* Add data nodes, rpcs and notifications. */
if ((ext_ctx->flags & LY_CTX_SET_PRIV_PARSED) && mod->compiled) {
/* For compiled module. */
rc = lyplg_ext_sprinter_ctree_add_nodes(ctx, mod->compiled->data,
schema_mount_sprinter_tree_cnode_override_mounted);
LY_CHECK_GOTO(rc, cleanup);
if (mod->compiled->rpcs) {
rc = lyplg_ext_sprinter_ctree_add_nodes(ctx, &mod->compiled->rpcs->node,
schema_mount_sprinter_tree_cnode_override_mounted);
}
LY_CHECK_GOTO(rc, cleanup);
if (mod->compiled->notifs) {
rc = lyplg_ext_sprinter_ctree_add_nodes(ctx, &mod->compiled->notifs->node,
schema_mount_sprinter_tree_cnode_override_mounted);
}
LY_CHECK_GOTO(rc, cleanup);
} else {
/* For parsed module. */
rc = lyplg_ext_sprinter_ptree_add_nodes(ctx, mod->parsed->data,
schema_mount_sprinter_tree_pnode_override_mounted);
LY_CHECK_GOTO(rc, cleanup);
if (mod->parsed->rpcs) {
rc = lyplg_ext_sprinter_ptree_add_nodes(ctx, &mod->parsed->rpcs->node,
schema_mount_sprinter_tree_pnode_override_mounted);
}
LY_CHECK_GOTO(rc, cleanup);
if (mod->parsed->notifs) {
rc = lyplg_ext_sprinter_ptree_add_nodes(ctx, &mod->parsed->notifs->node,
schema_mount_sprinter_tree_pnode_override_mounted);
}
LY_CHECK_GOTO(rc, cleanup);
}
}
/* Add modules loaded as the result of a parent-reference. */
for (i = 0; refs && (i < refs->count); i++) {
tree1 = refs->snodes[i]->module->compiled->data;
/* Add data nodes from the module only once. */
is_first = 1;
for (j = 0; j < i; j++) {
tree2 = refs->snodes[j]->module->compiled->data;
if (tree1 == tree2) {
is_first = 0;
break;
}
}
if (is_first) {
/* Add all data nodes but unavailable nodes are skipped in the callback. */
rc = lyplg_ext_sprinter_ctree_add_nodes(ctx, tree1, schema_mount_sprinter_tree_node_override_parent_refs);
LY_CHECK_GOTO(rc, cleanup);
}
}
/* add private plugin data */
st_priv = calloc(1, sizeof(*st_priv));
LY_CHECK_ERR_GOTO(!st_priv, rc = LY_EMEM, cleanup);
st_priv->ext_ctx = ext_ctx;
st_priv->refs = refs;
rc = lyplg_ext_sprinter_tree_set_priv(ctx, st_priv, schema_mount_spriter_tree_free);
cleanup:
if (rc) {
ly_set_free(refs, NULL);
ly_ctx_destroy(ext_ctx);
}
return rc;
}
/**
* @brief Plugin descriptions for the Yang Schema Mount extension.
*
* Note that external plugins are supposed to use:
*
* LYPLG_EXTENSIONS = {
*/
const struct lyplg_ext_record plugins_schema_mount[] = {
{
.module = "ietf-yang-schema-mount",
.revision = "2019-01-14",
.name = "mount-point",
.plugin.id = "ly2 schema mount v1",
.plugin.parse = schema_mount_parse,
.plugin.compile = schema_mount_compile,
.plugin.printer_info = NULL,
.plugin.printer_ctree = schema_mount_sprinter_ctree,
.plugin.printer_ptree = schema_mount_sprinter_ptree,
.plugin.node = NULL,
.plugin.snode = schema_mount_snode,
.plugin.validate = schema_mount_validate,
.plugin.pfree = NULL,
.plugin.cfree = schema_mount_cfree
},
{0} /* terminating zeroed item */
};