/*
  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
  This file is part of GlusterFS.

  This file is licensed to you under your choice of the GNU Lesser
  General Public License, version 3 or any later version (LGPLv3 or
  later), or the GNU General Public License, version 2 (GPLv2), in all
  cases as published by the Free Software Foundation.
*/

#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <sys/uio.h>
#include <rpc/auth_unix.h>
#include <errno.h>

#include "xdr-rpc.h"
#include "xdr-common.h"
#include <glusterfs/common-utils.h>

/* Decodes the XDR format in msgbuf into rpc_msg.
 * The remaining payload is returned into payload.
 */
int
xdr_to_rpc_reply(char *msgbuf, size_t len, struct rpc_msg *reply,
                 struct iovec *payload, char *verfbytes)
{
    XDR xdr;
    int ret = -EINVAL;

    GF_VALIDATE_OR_GOTO("rpc", msgbuf, out);
    GF_VALIDATE_OR_GOTO("rpc", reply, out);

    memset(reply, 0, sizeof(struct rpc_msg));

    reply->acpted_rply.ar_verf = _null_auth;
    reply->acpted_rply.ar_results.where = NULL;
    reply->acpted_rply.ar_results.proc = (xdrproc_t)(xdr_void);

    xdrmem_create(&xdr, msgbuf, len, XDR_DECODE);
    if (!xdr_replymsg(&xdr, reply)) {
        gf_log("rpc", GF_LOG_WARNING, "failed to decode reply msg");
        goto out;
    }
    if (payload) {
        payload->iov_base = xdr_decoded_remaining_addr(xdr);
        payload->iov_len = xdr_decoded_remaining_len(xdr);
    }

    ret = 0;
out:
    return ret;
}

int
rpc_request_to_xdr(struct rpc_msg *request, char *dest, size_t len,
                   struct iovec *dst)
{
    XDR xdr;
    int ret = -1;

    GF_VALIDATE_OR_GOTO("rpc", dest, out);
    GF_VALIDATE_OR_GOTO("rpc", request, out);
    GF_VALIDATE_OR_GOTO("rpc", dst, out);

    xdrmem_create(&xdr, dest, len, XDR_ENCODE);
    if (!xdr_callmsg(&xdr, request)) {
        gf_log("rpc", GF_LOG_WARNING, "failed to encode call msg");
        goto out;
    }

    dst->iov_base = dest;
    dst->iov_len = xdr_encoded_length(xdr);

    ret = 0;

out:
    return ret;
}

int
auth_unix_cred_to_xdr(struct authunix_parms *au, char *dest, size_t len,
                      struct iovec *iov)
{
    XDR xdr;
    int ret = -1;

    GF_VALIDATE_OR_GOTO("rpc", au, out);
    GF_VALIDATE_OR_GOTO("rpc", dest, out);
    GF_VALIDATE_OR_GOTO("rpc", iov, out);

    xdrmem_create(&xdr, dest, len, XDR_DECODE);

    if (!xdr_authunix_parms(&xdr, au)) {
        gf_log("rpc", GF_LOG_WARNING, "failed to decode authunix parms");
        goto out;
    }

    iov->iov_base = dest;
    iov->iov_len = xdr_encoded_length(xdr);

    ret = 0;
out:
    return ret;
}