/* $XConsortium: protosetup.c,v 1.19 94/04/17 20:15:38 mor Exp $ */
/******************************************************************************


Copyright (c) 1993  X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.

Author: Ralph Mor, X Consortium
******************************************************************************/

#include <X11/ICE/ICElib.h>
#include "ICElibint.h"


IceProtocolSetupStatus
IceProtocolSetup (iceConn, myOpcode, clientData, mustAuthenticate,
    majorVersionRet, minorVersionRet, vendorRet, releaseRet,
    errorLength, errorStringRet)

IceConn	   iceConn;
int 	   myOpcode;
IcePointer clientData;
Bool       mustAuthenticate;
int	   *majorVersionRet;
int	   *minorVersionRet;
char	   **vendorRet;
char	   **releaseRet;
int  	   errorLength;
char 	   *errorStringRet;

{
    iceProtocolSetupMsg	*pMsg;
    char		*pData;
    _IceProtocol	*myProtocol;
    int			extra;
    Bool		gotReply, ioErrorOccured;
    int			accepted, i;
    int			hisOpcode;
    unsigned long	setup_sequence;
    IceReplyWaitInfo 	replyWait;
    _IceReply		reply;
    IcePoVersionRec	*versionRec;
    int			authCount;
    int			*authIndices;

    if (errorStringRet && errorLength > 0)
	*errorStringRet = '\0';

    *majorVersionRet = 0;
    *minorVersionRet = 0;
    *vendorRet = NULL;
    *releaseRet = NULL;

    if (myOpcode < 1 || myOpcode > _IceLastMajorOpcode)
    {
	strncpy (errorStringRet, "myOpcode out of range", errorLength);
	return (IceProtocolSetupFailure);
    }

    myProtocol = &_IceProtocols[myOpcode - 1];

    if (myProtocol->orig_client == NULL)
    {
	strncpy (errorStringRet,
	    "IceRegisterForProtocolSetup was not called", errorLength);
	return (IceProtocolSetupFailure);
    }


    /*
     * Make sure this protocol hasn't been activated already.
     */

    if (iceConn->process_msg_info)
    {
	for (i = iceConn->his_min_opcode; i <= iceConn->his_max_opcode; i++)
	{
	    if (iceConn->process_msg_info[
		i - iceConn->his_min_opcode].in_use &&
                iceConn->process_msg_info[
		i - iceConn->his_min_opcode ].my_opcode == myOpcode)
		break;
	}

	if (i <= iceConn->his_max_opcode)
	{
	    return (IceProtocolAlreadyActive);
	}
    }

    /*
     * Generate the message.
     */

    if (myProtocol->orig_client->auth_count > 0)
    {
	authIndices = (int *) malloc (
	    myProtocol->orig_client->auth_count * sizeof (int));

	_IceGetPoValidAuthIndices (myProtocol->protocol_name,
	    iceConn->connection_string,
	    myProtocol->orig_client->auth_count,
	    myProtocol->orig_client->auth_names,
            &authCount, authIndices);

    }
    else
    {
	authCount = 0;
	authIndices = NULL;
    }

    extra = STRING_BYTES (myProtocol->protocol_name) +
            STRING_BYTES (myProtocol->orig_client->vendor) +
            STRING_BYTES (myProtocol->orig_client->release);

    for (i = 0; i < authCount; i++)
    {
	extra += STRING_BYTES (myProtocol->orig_client->auth_names[
	    authIndices[i]]);
    }

    extra += (myProtocol->orig_client->version_count * 4);

    IceGetHeaderExtra (iceConn, 0, ICE_ProtocolSetup,
	SIZEOF (iceProtocolSetupMsg), WORD64COUNT (extra),
	iceProtocolSetupMsg, pMsg, pData);

    setup_sequence = iceConn->send_sequence;

    pMsg->protocolOpcode = myOpcode;
    pMsg->versionCount = myProtocol->orig_client->version_count;
    pMsg->authCount = authCount;
    pMsg->mustAuthenticate = mustAuthenticate;

    STORE_STRING (pData, myProtocol->protocol_name);
    STORE_STRING (pData, myProtocol->orig_client->vendor);
    STORE_STRING (pData, myProtocol->orig_client->release);

    for (i = 0; i < authCount; i++)
    {
	STORE_STRING (pData, myProtocol->orig_client->auth_names[
	    authIndices[i]]);
    }

    for (i = 0; i < myProtocol->orig_client->version_count; i++)
    {
	STORE_CARD16 (pData,
	    myProtocol->orig_client->version_recs[i].major_version);
	STORE_CARD16 (pData,
	    myProtocol->orig_client->version_recs[i].minor_version);
    }

    IceFlush (iceConn);


    /*
     * Process messages until we get a Protocol Reply.
     */

    replyWait.sequence_of_request = setup_sequence;
    replyWait.major_opcode_of_request = 0;
    replyWait.minor_opcode_of_request = ICE_ProtocolSetup;
    replyWait.reply = (IcePointer) &reply;

    iceConn->protosetup_to_you = (_IceProtoSetupToYouInfo *) malloc (
	sizeof (_IceProtoSetupToYouInfo));
    iceConn->protosetup_to_you->my_opcode = myOpcode;
    iceConn->protosetup_to_you->my_auth_count = authCount;
    iceConn->protosetup_to_you->auth_active = 0;
    iceConn->protosetup_to_you->my_auth_indices = authIndices;

    gotReply = False;
    ioErrorOccured = False;
    accepted = 0;

    while (!gotReply && !ioErrorOccured)
    {
	ioErrorOccured = (IceProcessMessages (
	    iceConn, &replyWait, &gotReply) == IceProcessMessagesIOError);

	if (ioErrorOccured)
	{
	    strncpy (errorStringRet,
		"IO error occured doing Protocol Setup on connection",
		errorLength);
	    return (IceProtocolSetupIOError);
	}
	else if (gotReply)
	{
	    if (reply.type == ICE_PROTOCOL_REPLY)
	    {
		if (reply.protocol_reply.version_index >=
		    myProtocol->orig_client->version_count)
		{
		    strncpy (errorStringRet,
	                "Got a bad version index in the Protocol Reply",
		        errorLength);

		    free (reply.protocol_reply.vendor);
		    free (reply.protocol_reply.release);
		}
		else
		{
		    versionRec = &(myProtocol->orig_client->version_recs[
		        reply.protocol_reply.version_index]);

		    accepted = 1;
		}
	    }
	    else /* reply.type == ICE_PROTOCOL_ERROR */
	    {
		/* Protocol Setup failed */
		
		strncpy (errorStringRet, reply.protocol_error.error_message,
		    errorLength);

		free (reply.protocol_error.error_message);
	    }

	    if (iceConn->protosetup_to_you->my_auth_indices)
		free ((char *) iceConn->protosetup_to_you->my_auth_indices);
	    free ((char *) iceConn->protosetup_to_you);
	    iceConn->protosetup_to_you = NULL;
	}
    }

    if (accepted)
    {
	_IceProcessMsgInfo *process_msg_info;

	*majorVersionRet = versionRec->major_version;
	*minorVersionRet = versionRec->minor_version;
	*vendorRet = reply.protocol_reply.vendor;
	*releaseRet = reply.protocol_reply.release;
	

	/*
	 * Increase the reference count for the number of active protocols.
	 */

	iceConn->proto_ref_count++;


	/*
	 * We may be using a different major opcode for this protocol
	 * than the other client.  Whenever we get a message, we must
	 * map to our own major opcode.
	 */

	hisOpcode = reply.protocol_reply.major_opcode;

	_IceAddOpcodeMapping (iceConn, hisOpcode, myOpcode);

	process_msg_info = &iceConn->process_msg_info[hisOpcode -
	    iceConn->his_min_opcode];

	process_msg_info->client_data = clientData;
	process_msg_info->accept_flag = 0;

	process_msg_info->process_msg_proc.orig_client =
		versionRec->process_msg_proc;

	return (IceProtocolSetupSuccess);
    }
    else
    {
	return (IceProtocolSetupFailure);
    }
}
