static void
recv_alive_msg (unsigned length)
{
CARD8 SessionRunning;
CARD32 AliveSessionID;
if (state != XDM_AWAIT_ALIVE_RESPONSE)
return;
if (length != 5)
return;
if (XdmcpReadCARD8 (&buffer, &SessionRunning) &&
XdmcpReadCARD32 (&buffer, &AliveSessionID))
{
if (SessionRunning && AliveSessionID == SessionID)
{
/* backoff dormancy period */
state = XDM_RUN_SESSION;
if ((GetTimeInMillis() - lastDeviceEventTime.milliseconds) >
keepaliveDormancy * 1000)
{
keepaliveDormancy <<= 1;
if (keepaliveDormancy > XDM_MAX_DORMANCY)
keepaliveDormancy = XDM_MAX_DORMANCY;
}
timeOutTime = GetTimeInMillis() + keepaliveDormancy * 1000;
}
else
{
XdmcpDeadSession ("Alive respose indicates session dead");
}
}
}
static void send_alive(struct sockaddr *from, int fromlen, int length, int fd)
{
CARD32 sessionID;
CARD16 displayNumber;
struct display *d;
XdmcpHeader header;
CARD8 sendRunning;
CARD32 sendSessionID;
Debug("send <alive>\n");
if(XdmcpReadCARD16(&buffer, &displayNumber) && XdmcpReadCARD32(&buffer, &sessionID))
{
if(length == 6)
{
if(!(d = FindDisplayBySessionID(sessionID)))
d = FindDisplayByAddress((XdmcpNetaddr)from, fromlen, displayNumber);
sendRunning = 0;
sendSessionID = 0;
if(d && d->status == running)
{
if(d->sessionID == sessionID)
sendRunning = 1;
sendSessionID = d->sessionID;
}
header.version = XDM_PROTOCOL_VERSION;
header.opcode = (CARD16)ALIVE;
header.length = 5;
Debug("<alive>: %d %ld\n", sendRunning, (long)sendSessionID);
XdmcpWriteHeader(&buffer, &header);
XdmcpWriteCARD8(&buffer, sendRunning);
XdmcpWriteCARD32(&buffer, sendSessionID);
XdmcpFlush(fd, &buffer, (XdmcpNetaddr)from, fromlen);
}
}
}
static void
recv_accept_msg(unsigned length)
{
CARD32 AcceptSessionID;
ARRAY8 AcceptAuthenticationName, AcceptAuthenticationData;
ARRAY8 AcceptAuthorizationName, AcceptAuthorizationData;
if (state != XDM_AWAIT_REQUEST_RESPONSE)
return;
AcceptAuthenticationName.data = 0;
AcceptAuthenticationData.data = 0;
AcceptAuthorizationName.data = 0;
AcceptAuthorizationData.data = 0;
if (XdmcpReadCARD32 (&buffer, &AcceptSessionID) &&
XdmcpReadARRAY8 (&buffer, &AcceptAuthenticationName) &&
XdmcpReadARRAY8 (&buffer, &AcceptAuthenticationData) &&
XdmcpReadARRAY8 (&buffer, &AcceptAuthorizationName) &&
XdmcpReadARRAY8 (&buffer, &AcceptAuthorizationData))
{
if (length == 12 + AcceptAuthenticationName.length +
AcceptAuthenticationData.length +
AcceptAuthorizationName.length +
AcceptAuthorizationData.length)
{
if (!XdmcpCheckAuthentication (&AcceptAuthenticationName,
&AcceptAuthenticationData, ACCEPT))
{
XdmcpFatal ("Authentication Failure", &AcceptAuthenticationName);
}
/* permit access control manipulations from this host */
AugmentSelf (&req_sockaddr, req_socklen);
/* if the authorization specified in the packet fails
* to be acceptable, enable the local addresses
*/
if (!XdmcpAddAuthorization (&AcceptAuthorizationName,
&AcceptAuthorizationData))
{
AddLocalHosts ();
}
SessionID = AcceptSessionID;
state = XDM_MANAGE;
send_packet();
}
}
XdmcpDisposeARRAY8 (&AcceptAuthenticationName);
XdmcpDisposeARRAY8 (&AcceptAuthenticationData);
XdmcpDisposeARRAY8 (&AcceptAuthorizationName);
XdmcpDisposeARRAY8 (&AcceptAuthorizationData);
}
static void
recv_refuse_msg(unsigned length)
{
CARD32 RefusedSessionID;
if (state != XDM_AWAIT_MANAGE_RESPONSE)
return;
if (length != 4)
return;
if (XdmcpReadCARD32(&buffer, &RefusedSessionID)) {
if (RefusedSessionID == SessionID) {
state = XDM_START_CONNECTION;
send_packet();
}
}
}
static void
recv_failed_msg(unsigned length)
{
CARD32 FailedSessionID;
ARRAY8 status;
if (state != XDM_AWAIT_MANAGE_RESPONSE)
return;
status.data = 0;
if (XdmcpReadCARD32(&buffer, &FailedSessionID) &&
XdmcpReadARRAY8(&buffer, &status)) {
if (length == 6 + status.length && SessionID == FailedSessionID) {
XdmcpFatal("Session failed", &status);
}
}
XdmcpDisposeARRAY8(&status);
}
static void
recv_alive_msg(unsigned length)
{
CARD8 SessionRunning;
CARD32 AliveSessionID;
if (state != XDM_AWAIT_ALIVE_RESPONSE)
return;
if (length != 5)
return;
if (XdmcpReadCARD8(&buffer, &SessionRunning) &&
XdmcpReadCARD32(&buffer, &AliveSessionID)) {
if (SessionRunning && AliveSessionID == SessionID) {
state = XDM_RUN_SESSION;
timeOutTime = GetTimeInMillis() + XDM_DEF_DORMANCY * 1000;
}
else {
XdmcpDeadSession("Alive response indicates session dead");
}
}
}
int
XdmcpReadARRAY32 (XdmcpBufferPtr buffer, ARRAY32Ptr array)
{
int i;
/*
* When returning FALSE, guarantee that array->data = 0.
* This allows the user to safely call XdmcpDisposeARRAY32(array)
* regardless of the return value below.
* Note that XdmcpDisposeARRAY*(array) will call free(array->data),
* so we must guarantee that array->data is NULL or a malloced pointer.
*/
if (!XdmcpReadCARD8 (buffer, &array->length)) {
array->data = NULL;
return FALSE;
}
if (!array->length)
{
array->data = NULL;
return TRUE;
}
array->data = (CARD32 *) malloc(array->length * sizeof (CARD32));
if (!array->data)
return FALSE;
for (i = 0; i < (int)array->length; i++)
{
if (!XdmcpReadCARD32 (buffer, &array->data[i]))
{
free(array->data);
array->data = NULL;
array->length = 0;
return FALSE;
}
}
return TRUE;
}
static void manage(struct sockaddr *from, int fromlen, int length, int fd)
{
CARD32 sessionID;
CARD16 displayNumber;
ARRAY8 displayClass;
int expectlen;
struct protoDisplay *pdpy;
struct display *d;
char *name = NULL;
char *class2 = NULL;
XdmcpNetaddr from_save;
ARRAY8 clientAddress, clientPort;
CARD16 connectionType;
Debug("<manage> %d\n", length);
displayClass.data = 0;
displayClass.length = 0;
if(XdmcpReadCARD32(&buffer, &sessionID) && XdmcpReadCARD16(&buffer, &displayNumber) && XdmcpReadARRAY8(&buffer, &displayClass))
{
expectlen = 4 + /* session ID */
2 + /* displayNumber */
2 + displayClass.length; /* displayClass */
if(expectlen != length)
{
Debug("<manage> length error got %d expect %d\n", length, expectlen);
goto abort;
}
pdpy = FindProtoDisplay((XdmcpNetaddr)from, fromlen, displayNumber);
Debug("<manage> session ID %ld, pdpy %p\n", (long)sessionID, pdpy);
if(!pdpy || pdpy->sessionID != sessionID)
{
/*
* We may have already started a session for this display
* but it hasn't seen the response in the form of an
* XOpenDisplay() yet. So check if it is in the list of active
* displays, and if so check that the session id's match.
* If all this is true, then we have a duplicate request that
* can be ignored.
*/
if(!pdpy && (d = FindDisplayByAddress((XdmcpNetaddr)from, fromlen, displayNumber)) && d->sessionID == sessionID)
{
Debug("manage: got duplicate pkt, ignoring\n");
goto abort;
}
Debug("session ID %ld refused\n", (long)sessionID);
if(pdpy)
Debug("existing session ID %ld\n", (long)pdpy->sessionID);
send_refuse(from, fromlen, sessionID, fd);
}
else
{
name = NetworkAddressToName(pdpy->connectionType, &pdpy->connectionAddress, from, pdpy->displayNumber);
if(!name)
{
Debug("could not compute display name\n");
send_failed(from, fromlen, "(no name)", sessionID, "out of memory", fd);
goto abort;
}
Debug("computed display name: %s\n", name);
if((d = FindDisplayByName(name)))
{
Debug("terminating active session for %s\n", d->name);
StopDisplay(d);
}
if(displayClass.length)
{
if(!StrNDup(&class2, (char *)displayClass.data, displayClass.length))
{
send_failed(from, fromlen, name, sessionID, "out of memory", fd);
goto abort;
}
}
if(!(from_save = (XdmcpNetaddr)Malloc(fromlen)))
{
send_failed(from, fromlen, name, sessionID, "out of memory", fd);
goto abort;
}
memmove(from_save, from, fromlen);
if(!(d = NewDisplay(name)))
{
free((char *)from_save);
send_failed(from, fromlen, name, sessionID, "out of memory", fd);
goto abort;
}
d->class2 = class2;
class2 = 0;
d->displayType = dForeign | dTransient | dFromXDMCP;
d->sessionID = pdpy->sessionID;
d->from.data = (unsigned char *)from_save;
d->from.length = fromlen;
d->displayNumber = pdpy->displayNumber;
ClientAddress(from, &clientAddress, &clientPort, &connectionType);
d->useChooser = 0;
d->xdmcpFd = fd;
if(IsIndirectClient(&clientAddress, connectionType))
{
Debug("IsIndirectClient\n");
ForgetIndirectClient(&clientAddress, connectionType);
if(UseChooser(&clientAddress, connectionType))
{
d->useChooser = 1;
Debug("use chooser for %s\n", d->name);
}
}
d->clientAddr = clientAddress;
d->connectionType = connectionType;
d->remoteHost = NetworkAddressToHostname(pdpy->connectionType, &pdpy->connectionAddress);
XdmcpDisposeARRAY8(&clientPort);
if(pdpy->fileAuthorization)
{
d->authorizations = (Xauth **)Malloc(sizeof(Xauth *));
if(!d->authorizations)
{
free((char *)from_save);
free((char *)d);
send_failed(from, fromlen, name, sessionID, "out of memory", fd);
goto abort;
}
d->authorizations[0] = pdpy->fileAuthorization;
d->authNum = 1;
pdpy->fileAuthorization = 0;
}
DisposeProtoDisplay(pdpy);
Debug("starting display %s,%s\n", d->name, d->class2);
if(LoadDisplayResources(d) < 0)
{
LogError(
"Unable to read configuration for display %s; "
"stopping it.\n",
d->name);
StopDisplay(d);
}
else
StartDisplay(d);
CloseGetter();
}
}
abort:
XdmcpDisposeARRAY8(&displayClass);
if(name)
free((char *)name);
if(class2)
free((char *)class2);
}
