libyang-crash.c

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <err.h>
#include <assert.h>
#include <arpa/inet.h>
#include <stdbool.h>

#include <libyang/libyang.h>

static struct ly_ctx *ly_ctx;
static struct lyd_node *running, *candidate;

static void validate_config(struct lyd_node **config)
{
	if (lyd_validate(config, LYD_OPT_CONFIG, ly_ctx) != 0)
		errx(1, "lyd_validate");
}

static void edit_candidate(const char *xpath, const char *value)
{
	struct lyd_node *node;

	ly_errno = 0;
	node = lyd_new_path(candidate, ly_ctx, xpath, (void *)value, 0,
			    LYD_PATH_OPT_UPDATE);
	if (node == NULL && ly_errno)
		errx(1, "lyd_new_path");
}

static void commit_candidate(void)
{
	lyd_free_withsiblings(running);
	running = candidate;
	candidate = lyd_dup_withsiblings(running, 1);
	if (candidate == NULL)
		errx(1, "lyd_dup_withsiblings");
}

int main(int argc, char **argv)
{
	/* initialization */
	ly_ctx = ly_ctx_new(NULL, 0);
	ly_ctx_set_searchdir(ly_ctx, "/usr/local/share/yang/");
	ly_ctx_load_module(ly_ctx, "frr-ripd", NULL);

	validate_config(&running);
	validate_config(&candidate);

	// Edit config (1)
	edit_candidate("/frr-ripd:ripd/instance", NULL);
	validate_config(&candidate);
	commit_candidate();

	// Edit config (2)
	edit_candidate("/frr-ripd:ripd/instance/allow-ecmp", "true");
	validate_config(&candidate); // <-- Crashes here!
	commit_candidate();

	/* cleanup */
	lyd_free_withsiblings(candidate);
	lyd_free_withsiblings(running);
	ly_ctx_destroy(ly_ctx, NULL);
	printf("Exiting...\n");

	return 0;
}