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/*
Copyright (C) 2011 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
Red Hat Authors:
hdegoede@redhat.com
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include "red_common.h"
#include "agent-msg-filter.h"
void agent_msg_filter_init(struct AgentMsgFilter *filter,
int copy_paste, int discard_all)
{
memset(filter, 0, sizeof(*filter));
filter->copy_paste_enabled = copy_paste;
filter->discard_all = discard_all;
}
int agent_msg_filter_process_data(struct AgentMsgFilter *filter,
uint8_t *data, uint32_t len)
{
struct VDAgentMessage msg_header;
if (len > VD_AGENT_MAX_DATA_SIZE) {
spice_printerr("invalid agent message: too large");
return AGENT_MSG_FILTER_PROTO_ERROR;
}
/* Are we expecting more data from a previous message? */
if (filter->msg_data_to_read) {
data_to_read:
if (len > filter->msg_data_to_read) {
spice_printerr("invalid agent message: data exceeds size from header");
return AGENT_MSG_FILTER_PROTO_ERROR;
}
filter->msg_data_to_read -= len;
return filter->result;
}
if (len < sizeof(msg_header)) {
spice_printerr("invalid agent message: incomplete header");
return AGENT_MSG_FILTER_PROTO_ERROR;
}
memcpy(&msg_header, data, sizeof(msg_header));
len -= sizeof(msg_header);
if (msg_header.protocol != VD_AGENT_PROTOCOL) {
spice_printerr("invalid agent protocol: %u", msg_header.protocol);
return AGENT_MSG_FILTER_PROTO_ERROR;
}
if (filter->discard_all) {
filter->result = AGENT_MSG_FILTER_DISCARD;
} else {
switch (msg_header.type) {
case VD_AGENT_CLIPBOARD:
case VD_AGENT_CLIPBOARD_GRAB:
case VD_AGENT_CLIPBOARD_REQUEST:
case VD_AGENT_CLIPBOARD_RELEASE:
if (filter->copy_paste_enabled) {
filter->result = AGENT_MSG_FILTER_OK;
} else {
filter->result = AGENT_MSG_FILTER_DISCARD;
}
break;
default:
filter->result = AGENT_MSG_FILTER_OK;
}
}
filter->msg_data_to_read = msg_header.size;
if (filter->msg_data_to_read) {
goto data_to_read;
}
return filter->result;
}
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