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Transform YANG when expressions to canonical xpath form

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This commit is contained in:
Olof hagsand 2024-08-21 21:55:14 +02:00
parent 71e921520e
commit 26ca872b0c
8 changed files with 262 additions and 87 deletions
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96
lib/src/clixon_xpath.c
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@ -974,21 +974,78 @@ xpath_vec_bool(cxobj *xcur,
return retval;
}
/*! Translate literal string to "canonical" form
*
* the prefix according to actual namespace.
* Actually it depends on context if the rewrite should be made.
*/
static int
traverse_canonical_str(xpath_tree *xs,
yang_stmt *yspec,
cvec *nsc0,
cvec *nsc1)
{
int retval = -1;
char *name = NULL;
char *prefix0 = NULL;
char *prefix1 = NULL;
char *namespace;
yang_stmt *ymod;
cbuf *cb = NULL;
if (nodeid_split(xs->xs_s0, &prefix0, &name) < 0)
goto done;
if (prefix0 != NULL && name != NULL &&
(namespace = xml_nsctx_get(nsc0, prefix0)) != NULL) {
if ((ymod = yang_find_module_by_namespace(yspec, namespace)) != NULL &&
(prefix1 = yang_find_myprefix(ymod)) != NULL){
if (xml_nsctx_get(nsc1, prefix1) == NULL)
if (xml_nsctx_add(nsc1, prefix1, namespace) < 0)
goto done;
free(xs->xs_s0);
xs->xs_s0 = NULL;
if ((cb = cbuf_new()) == NULL){
clixon_err(OE_UNIX, errno, "cbuf_new");
goto done;
}
cprintf(cb, "%s:%s", prefix1, name);
if ((xs->xs_s0 = strdup(cbuf_get(cb))) == NULL){
clixon_err(OE_UNIX, errno, "strdup");
goto done;
}
}
}
retval = 0;
done:
if (cb)
cbuf_free(cb);
if (name)
free(name);
if (prefix0)
free(prefix0);
return retval;
}
/*! Translate an xpath/nsc pair to a "canonical" form using yang prefixes
*
* Returns new namespace context and rewrites the xpath tree
* @param[in] xs Parsed xpath - xpath_tree
* @param[in] yspec Yang spec containing all modules, associated with namespaces
* @param[in] nsc0 Input namespace context
* @param[in] exprstr Interpret strings as <prefix>:<name> (primaryexpr/literal/string)
* @param[out] nsc1 Output namespace context. Free after use with xml_nsctx_free
* @param[out] reason Error reason if result is 0 - failed
* @retval 1 OK with nsc1 containing the transformed nsc
* @retval 0 XPath failure with reason set to why
* @retval -1 Fatal Error
* @note Setting str to 1 requires a knowledge of the context of the xpath, ie that strings are
* something like identityref and is safe to translate into canonical form
*/
static int
xpath_traverse_canonical(xpath_tree *xs,
yang_stmt *yspec,
cvec *nsc0,
int exprstr,
cvec *nsc1,
cbuf **reason)
{
@ -999,9 +1056,13 @@ xpath_traverse_canonical(xpath_tree *xs,
yang_stmt *ymod;
cbuf *cb = NULL;
int ret;
// char *name;
switch (xs->xs_type){
case XP_PRIME_STR:
if (exprstr != 0)
if (traverse_canonical_str(xs, yspec, nsc0, nsc1) < 0)
goto done;
break;
case XP_NODE: /* s0 is namespace prefix, s1 is name */
/* Nodetest = * needs no prefix */
if (xs->xs_s1 && strcmp(xs->xs_s1, "*") == 0)
@ -1061,13 +1122,13 @@ xpath_traverse_canonical(xpath_tree *xs,
break;
}
if (xs->xs_c0){
if ((ret = xpath_traverse_canonical(xs->xs_c0, yspec, nsc0, nsc1, reason)) < 0)
if ((ret = xpath_traverse_canonical(xs->xs_c0, yspec, nsc0, exprstr, nsc1, reason)) < 0)
goto done;
if (ret == 0)
goto fail;
}
if (xs->xs_c1){
if ((ret = xpath_traverse_canonical(xs->xs_c1, yspec, nsc0, nsc1, reason)) < 0)
if ((ret = xpath_traverse_canonical(xs->xs_c1, yspec, nsc0, exprstr, nsc1, reason)) < 0)
goto done;
if (ret == 0)
goto fail;
@ -1085,8 +1146,10 @@ xpath_traverse_canonical(xpath_tree *xs,
* @param[in] xpath0 Input xpath
* @param[in] nsc0 Input namespace context
* @param[in] yspec Yang spec containing all modules, associated with namespaces
* @param[in] exprstr Interpret strings as <prefix>:<name> (primaryexpr/literal/string)
* @param[out] xpath1 Output xpath. Free after use with free
* @param[out] nsc1 Output namespace context. Free after use with xml_nsctx_free
* @param[out] cbreason reason if retval = 0
* @retval 1 OK, xpath1 and nsc1 allocated
* @retval 0 XPath failure with reason set to why
* @retval -1 Fatal Error
@ -1116,12 +1179,13 @@ xpath_traverse_canonical(xpath_tree *xs,
* @see xpath2xml
*/
int
xpath2canonical(const char *xpath0,
cvec *nsc0,
yang_stmt *yspec,
char **xpath1,
cvec **nsc1p,
cbuf **cbreason)
xpath2canonical1(const char *xpath0,
cvec *nsc0,
yang_stmt *yspec,
int exprstr,
char **xpath1,
cvec **nsc1p,
cbuf **cbreason)
{
int retval = -1;
xpath_tree *xpt = NULL;
@ -1133,13 +1197,14 @@ xpath2canonical(const char *xpath0,
/* Parse input xpath into an xpath-tree */
if (xpath_parse(xpath0, &xpt) < 0)
goto done;
// xpath_tree_print(stderr, xpt);
/* Create new nsc */
if ((nsc1 = xml_nsctx_init(NULL, NULL)) == NULL)
goto done;
/* Traverse tree to find prefixes, transform them to canonical form and
* create a canonical network namespace
*/
if ((ret = xpath_traverse_canonical(xpt, yspec, nsc0, nsc1, cbreason)) < 0)
if ((ret = xpath_traverse_canonical(xpt, yspec, nsc0, exprstr, nsc1, cbreason)) < 0)
goto done;
if (ret == 0)
goto fail;
@ -1174,6 +1239,17 @@ xpath2canonical(const char *xpath0,
goto done;
}
int
xpath2canonical(const char *xpath0,
cvec *nsc0,
yang_stmt *yspec,
char **xpath1,
cvec **nsc1p,
cbuf **cbreason)
{
return xpath2canonical1(xpath0, nsc0, yspec, 0, xpath1, nsc1p, cbreason);
}
/*! Return a count(xpath)
*
* @param[in] xcur xml-tree where to search