xref: /xsrc/external/mit/libICE/dist/src/protosetup.c

/******************************************************************************


Copyright 1993, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

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
OPEN GROUP 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 Open Group 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 Open Group.

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

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <X11/ICE/ICElib.h>
#include "ICElibint.h"


IceProtocolSetupStatus
IceProtocolSetup (
	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 = NULL;
    int			authCount;
    int			*authIndices;

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

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

    if (myOpcode < 1 || myOpcode > _IceLastMajorOpcode)
    {
	if (errorStringRet && errorLength > 0) {
	    strncpy (errorStringRet, "myOpcode out of range", errorLength);
	    errorStringRet[errorLength - 1] = '\0';
	}
	return (IceProtocolSetupFailure);
    }

    myProtocol = &_IceProtocols[myOpcode - 1];

    if (myProtocol->orig_client == NULL)
    {
	if (errorStringRet && errorLength > 0) {
	    strncpy (errorStringRet,
		"IceRegisterForProtocolSetup was not called", errorLength);
	    errorStringRet[errorLength - 1] = '\0';
	}
	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 = malloc (
	    myProtocol->orig_client->auth_count * sizeof (int));

	_IceGetPoValidAuthIndices (myProtocol->protocol_name,
	    iceConn->connection_string,
	    myProtocol->orig_client->auth_count,
	    (const char **) 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);

    if (pData == NULL) {
	iceConn->outbufptr -= SIZEOF (iceProtocolSetupMsg);
	free(authIndices);
	if (errorStringRet && errorLength > 0) {
	    strncpy (errorStringRet,
		"Too much extra data for iceProtocolSetupMsg", errorLength);
	    errorStringRet[errorLength - 1] = '\0';
	}
	return (IceProtocolSetupFailure);
    }

    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 = 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)
	{
	    if (errorStringRet && errorLength > 0) {
		strncpy (errorStringRet,
		    "IO error occurred doing Protocol Setup on connection",
		    errorLength);
		errorStringRet[errorLength - 1] = '\0';
	    }
	    return (IceProtocolSetupIOError);
	}
	else if (gotReply)
	{
	    if (reply.type == ICE_PROTOCOL_REPLY)
	    {
		if (reply.protocol_reply.version_index >=
		    myProtocol->orig_client->version_count)
		{
		    if (errorStringRet && errorLength > 0) {
			strncpy (errorStringRet,
	                    "Got a bad version index in the Protocol Reply",
		            errorLength);
			errorStringRet[errorLength - 1] = '\0';
		    }

		    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 */

		if (errorStringRet && errorLength > 0) {
		    strncpy (errorStringRet, reply.protocol_error.error_message,
			errorLength);
		    errorStringRet[errorLength - 1] = '\0';
		}

		free (reply.protocol_error.error_message);
	    }

	    if (iceConn->protosetup_to_you->my_auth_indices)
		free (iceConn->protosetup_to_you->my_auth_indices);
	    free (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);
    }
}