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Added nsctx argument to cli_dbxml() and exposed it as a public function

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Added function clixon_instance_id_bind()
This commit is contained in:
Olof hagsand 2020-07-28 16:11:30 +02:00
parent 3ecc259ec7
commit d2ccee4eab
4 changed files with 129 additions and 19 deletions
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91
lib/src/clixon_path.c
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@ -1683,3 +1683,94 @@ clixon_xml_find_instance_id(cxobj *xt,
goto done;
}
/*! Given (instance-id) path and YANG, parse path, resolve YANG and return namespace binding
*
* Instance-identifier is a subset of XML XPaths and defined in Yang, used in NACM for
* example.
* @param[in] yt Yang statement of top symbol (can be yang-spec if top-level)
* @param[out] nsctx Namespace context (should be created on entry)
* @param[in] format Format string for api-path syntax
* @retval -1 Error
* @retval 0 Non-fatal failure, yang bind failures, etc,
* @retval 1 OK with found xml nodes in xvec (if any)
* Reasons for nomatch (retval = 0) are:
* - Modulename in api-path does not correspond to existing module
* - Modulename not defined for top-level id.
* - Number of keys in key-value list does not match Yang list
* @code
* cvec *nsctx = NULL;
*
* nsctx = cvec_new(0);
* if (clixon_instance_id_bind(yspec, nsctx, "/symbol/%s", "foo") < 0)
* goto err;
* ...
* cvec_free(nsctx);
* @endcode
* @note canonical namespace contexts are used, see xpath2canonical
* @see clixon_xml_find_instance_id for finding XML nodes using instance-id:s
* @see RFC7950 Sec 9.13
*/
int
clixon_instance_id_bind(yang_stmt *yt,
cvec *nsctx,
const char *format,
...)
{
int retval = -1;
va_list ap;
size_t len;
char *path = NULL;
clixon_path *cplist = NULL;
clixon_path *cp;
int ret;
char *namespace;
va_start(ap, format);
len = vsnprintf(NULL, 0, format, ap);
va_end(ap);
/* allocate a path string exactly fitting the length */
if ((path = malloc(len+1)) == NULL){
clicon_err(OE_UNIX, errno, "malloc");
goto done;
}
/* second round: actually compute api-path string content */
va_start(ap, format);
if (vsnprintf(path, len+1, format, ap) < 0){
clicon_err(OE_UNIX, errno, "vsnprintf");
va_end(ap);
goto done;
}
va_end(ap);
if (instance_id_parse(path, &cplist) < 0)
goto done;
if (clicon_debug_get())
clixon_path_print(stderr, cplist);
/* Resolve module:name to pointer to yang-stmt, fail if not successful */
if ((ret = instance_id_resolve(cplist, yt)) < 0)
goto done;
if (ret == 0)
goto fail;
/* Loop through prefixes used */
if ((cp = cplist) != NULL){
do {
if (cp->cp_prefix &&
cp->cp_yang &&
(namespace = yang_find_mynamespace(cp->cp_yang)) != NULL){
if (xml_nsctx_get(nsctx, cp->cp_prefix) == NULL)
if (xml_nsctx_add(nsctx, cp->cp_prefix, namespace) < 0)
goto done;
}
cp = NEXTQ(clixon_path *, cp);
} while (cp && cp != cplist);
}
retval = 1;
done:
if (cplist)
clixon_path_free(cplist);
if (path)
free(path);
return retval;
fail:
retval = 0;
goto done;
}