static int nfs_lookup_reply(uchar *pkt, unsigned len)
{
	struct rpc_t rpc_pkt;

	debug("%s\n", __func__);

	memcpy(&rpc_pkt.u.data[0], pkt, len);

	if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
		return -NFS_RPC_ERR;
	else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
		return -NFS_RPC_DROP;

	if (rpc_pkt.u.reply.rstatus  ||
	    rpc_pkt.u.reply.verifier ||
	    rpc_pkt.u.reply.astatus  ||
	    rpc_pkt.u.reply.data[0]) {
		switch (ntohl(rpc_pkt.u.reply.astatus)) {
		case NFS_RPC_SUCCESS: /* Not an error */
			break;
		case NFS_RPC_PROG_MISMATCH:
			/* Remote can't support NFS version */
			switch (ntohl(rpc_pkt.u.reply.data[0])) {
			/* Minimal supported NFS version */
			case 3:
				debug("*** Warning: NFS version not supported: Requested: V%d, accepted: min V%d - max V%d\n",
				      (supported_nfs_versions & NFSV2_FLAG) ?
						2 : 3,
				      ntohl(rpc_pkt.u.reply.data[0]),
				      ntohl(rpc_pkt.u.reply.data[1]));
				debug("Will retry with NFSv3\n");
				/* Clear NFSV2_FLAG from supported versions */
				supported_nfs_versions &= ~NFSV2_FLAG;
				return -NFS_RPC_PROG_MISMATCH;
			case 4:
			default:
				puts("*** ERROR: NFS version not supported");
				debug(": Requested: V%d, accepted: min V%d - max V%d\n",
				      (supported_nfs_versions & NFSV2_FLAG) ?
						2 : 3,
				      ntohl(rpc_pkt.u.reply.data[0]),
				      ntohl(rpc_pkt.u.reply.data[1]));
				puts("\n");
			}
			break;
		case NFS_RPC_PROG_UNAVAIL:
		case NFS_RPC_PROC_UNAVAIL:
		case NFS_RPC_GARBAGE_ARGS:
		case NFS_RPC_SYSTEM_ERR:
		default: /* Unknown error on 'accept state' flag */
			debug("*** ERROR: accept state error (%d)\n",
			      ntohl(rpc_pkt.u.reply.astatus));
			break;
		}
		return -1;
	}

	if (supported_nfs_versions & NFSV2_FLAG) {
		if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + NFS_FHSIZE) > len)
			return -NFS_RPC_DROP;
		memcpy(filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
	} else {  /* NFSV3_FLAG */
		filefh3_length = ntohl(rpc_pkt.u.reply.data[1]);
		if (filefh3_length > NFS3_FHSIZE)
			filefh3_length  = NFS3_FHSIZE;
		if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + filefh3_length) > len)
			return -NFS_RPC_DROP;
		memcpy(filefh, rpc_pkt.u.reply.data + 2, filefh3_length);
	}

	return 0;
}
static int nfs_lookup_reply(uchar *pkt, unsigned len)
{
	struct rpc_t rpc_pkt;

	debug("%s\n", __func__);

	memcpy(&rpc_pkt.u.data[0], pkt, len);

	if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
		return -NFS_RPC_ERR;
	else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
		return -NFS_RPC_DROP;

	if (rpc_pkt.u.reply.rstatus  ||
	    rpc_pkt.u.reply.verifier ||
	    rpc_pkt.u.reply.astatus  ||
	    rpc_pkt.u.reply.data[0]) {
		switch (ntohl(rpc_pkt.u.reply.astatus)) {
		case NFS_RPC_SUCCESS:  
			break;
		case NFS_RPC_PROG_MISMATCH:
			 
			switch (ntohl(rpc_pkt.u.reply.data[0])) {
			 
			case 3:
				debug("*** Warning: NFS version not supported: Requested: V%d, accepted: min V%d - max V%d\n",
				      (supported_nfs_versions & NFSV2_FLAG) ?
						2 : 3,
				      ntohl(rpc_pkt.u.reply.data[0]),
				      ntohl(rpc_pkt.u.reply.data[1]));
				debug("Will retry with NFSv3\n");
				 
				supported_nfs_versions &= ~NFSV2_FLAG;
				return -NFS_RPC_PROG_MISMATCH;
			case 4:
			default:
				puts("*** ERROR: NFS version not supported");
				debug(": Requested: V%d, accepted: min V%d - max V%d\n",
				      (supported_nfs_versions & NFSV2_FLAG) ?
						2 : 3,
				      ntohl(rpc_pkt.u.reply.data[0]),
				      ntohl(rpc_pkt.u.reply.data[1]));
				puts("\n");
			}
			break;
		case NFS_RPC_PROG_UNAVAIL:
		case NFS_RPC_PROC_UNAVAIL:
		case NFS_RPC_GARBAGE_ARGS:
		case NFS_RPC_SYSTEM_ERR:
		default:  
			debug("*** ERROR: accept state error (%d)\n",
			      ntohl(rpc_pkt.u.reply.astatus));
			break;
		}
		return -1;
	}

	if (supported_nfs_versions & NFSV2_FLAG) {
		if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + NFS_FHSIZE) > len)
			return -NFS_RPC_DROP;
		memcpy(filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
	} else {   
		filefh3_length = ntohl(rpc_pkt.u.reply.data[1]);
		if (filefh3_length > NFS3_FHSIZE)
			filefh3_length  = NFS3_FHSIZE;
		if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + filefh3_length) > len)
			return -NFS_RPC_DROP;
		memcpy(filefh, rpc_pkt.u.reply.data + 2, filefh3_length);
	}

	return 0;
}