fs/cifs/dfs.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2022 Paulo Alcantara <palcantara@suse.de>
 */

#include "cifsproto.h"
#include "cifs_debug.h"
#include "dns_resolve.h"
#include "fs_context.h"
#include "dfs.h"

/**
 * dfs_parse_target_referral - set fs context for dfs target referral
 *
 * @full_path: full path in UNC format.
 * @ref: dfs referral pointer.
 * @ctx: smb3 fs context pointer.
 *
 * Return zero if dfs referral was parsed correctly, otherwise non-zero.
 */
int dfs_parse_target_referral(const char *full_path, const struct dfs_info3_param *ref,
			      struct smb3_fs_context *ctx)
{
	int rc;
	const char *prepath = NULL;
	char *path;

	if (!full_path || !*full_path || !ref || !ctx)
		return -EINVAL;

	if (WARN_ON_ONCE(!ref->node_name || ref->path_consumed < 0))
		return -EINVAL;

	if (strlen(full_path) - ref->path_consumed) {
		prepath = full_path + ref->path_consumed;
		/* skip initial delimiter */
		if (*prepath == '/' || *prepath == '\\')
			prepath++;
	}

	path = cifs_build_devname(ref->node_name, prepath);
	if (IS_ERR(path))
		return PTR_ERR(path);

	rc = smb3_parse_devname(path, ctx);
	if (rc)
		goto out;

	rc = dns_resolve_server_name_to_ip(path, (struct sockaddr *)&ctx->dstaddr, NULL);

out:
	kfree(path);
	return rc;
}