523d35e3e1
AbortClient performs most of the same operations as CloseDownFileDescriptor except that it doesn't call ospoll_remove, leaving that unaware that the file descriptor has been closed. If the file descriptor is re-used before the server comes back around to clean up, and that new file descriptor is passed to SetNotifyFd, then that function will mistakenly re-interpret the stale ClientPtr returned by ospoll_data as a struct notify * instead and mangle data badly. To fix this, the patch does: 1) Change CloseDownFileDescriptor so that it can be called multiple times on the same OsCommPtr. The calls related to the file descriptor are moved inside the check for trans_conn and oc->trans_conn is set to NULL after cleaning up. 2) Move the XdmcpCloseDisplay call into CloseDownFileDescriptor. I don't think the actually matters as we just need to know at some point that the session client has exited. Moving it avoids the possibility of having this accidentally trigger from another client with the same fd which closes down at around the same time. 3) Change AbortClient to call CloseDownFileDescriptor. This makes sure that all of the fd-related clean up happens in the same way everywhere, in particular ensures that ospoll is notified about the closed file descriptor at the time it is closed and not some time later. Debian-bug: https://bugs.debian.org/862824 Reviewed-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Keith Packard <keithp@keithp.com>
219 lines
7.4 KiB
C
219 lines
7.4 KiB
C
/***********************************************************
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Copyright 1987, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of Digital not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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******************************************************************/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#ifndef _OSDEP_H_
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#define _OSDEP_H_ 1
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#if defined(XDMCP) || defined(HASXDMAUTH)
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#include <X11/Xdmcp.h>
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#endif
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#include <limits.h>
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#include <stddef.h>
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#include <X11/Xos.h>
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/* If EAGAIN and EWOULDBLOCK are distinct errno values, then we check errno
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* for both EAGAIN and EWOULDBLOCK, because some supposedly POSIX
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* systems are broken and return EWOULDBLOCK when they should return EAGAIN
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*/
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#ifndef WIN32
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# if (EAGAIN != EWOULDBLOCK)
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# define ETEST(err) (err == EAGAIN || err == EWOULDBLOCK)
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# else
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# define ETEST(err) (err == EAGAIN)
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# endif
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#else /* WIN32 The socket errorcodes differ from the normal errors */
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#define ETEST(err) (err == EAGAIN || err == WSAEWOULDBLOCK)
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#endif
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#if defined(XDMCP) || defined(HASXDMAUTH)
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typedef Bool (*ValidatorFunc) (ARRAY8Ptr Auth, ARRAY8Ptr Data, int packet_type);
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typedef Bool (*GeneratorFunc) (ARRAY8Ptr Auth, ARRAY8Ptr Data, int packet_type);
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typedef Bool (*AddAuthorFunc) (unsigned name_length, const char *name,
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unsigned data_length, char *data);
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#endif
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typedef struct _connectionInput *ConnectionInputPtr;
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typedef struct _connectionOutput *ConnectionOutputPtr;
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struct _osComm;
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#define AuthInitArgs void
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typedef void (*AuthInitFunc) (AuthInitArgs);
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#define AuthAddCArgs unsigned short data_length, const char *data, XID id
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typedef int (*AuthAddCFunc) (AuthAddCArgs);
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#define AuthCheckArgs unsigned short data_length, const char *data, ClientPtr client, const char **reason
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typedef XID (*AuthCheckFunc) (AuthCheckArgs);
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#define AuthFromIDArgs XID id, unsigned short *data_lenp, char **datap
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typedef int (*AuthFromIDFunc) (AuthFromIDArgs);
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#define AuthGenCArgs unsigned data_length, const char *data, XID id, unsigned *data_length_return, char **data_return
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typedef XID (*AuthGenCFunc) (AuthGenCArgs);
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#define AuthRemCArgs unsigned short data_length, const char *data
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typedef int (*AuthRemCFunc) (AuthRemCArgs);
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#define AuthRstCArgs void
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typedef int (*AuthRstCFunc) (AuthRstCArgs);
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typedef void (*OsCloseFunc) (ClientPtr);
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typedef int (*OsFlushFunc) (ClientPtr who, struct _osComm * oc, char *extraBuf,
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int extraCount);
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typedef struct _osComm {
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int fd;
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ConnectionInputPtr input;
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ConnectionOutputPtr output;
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XID auth_id; /* authorization id */
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CARD32 conn_time; /* timestamp if not established, else 0 */
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struct _XtransConnInfo *trans_conn; /* transport connection object */
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int flags;
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} OsCommRec, *OsCommPtr;
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#define OS_COMM_GRAB_IMPERVIOUS 1
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#define OS_COMM_IGNORED 2
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extern int FlushClient(ClientPtr /*who */ ,
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OsCommPtr /*oc */ ,
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const void * /*extraBuf */ ,
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int /*extraCount */
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);
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extern void FreeOsBuffers(OsCommPtr /*oc */
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);
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void
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CloseDownFileDescriptor(OsCommPtr oc);
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#include "dix.h"
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#include "ospoll.h"
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extern struct ospoll *server_poll;
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Bool
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listen_to_client(ClientPtr client);
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extern Bool NewOutputPending;
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extern WorkQueuePtr workQueue;
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/* in WaitFor.c */
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#if defined(WIN32) && !defined(__CYGWIN__)
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typedef long int fd_mask;
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#endif
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#define ffs mffs
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extern int mffs(fd_mask);
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/* in access.c */
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extern Bool ComputeLocalClient(ClientPtr client);
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/* in auth.c */
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extern void GenerateRandomData(int len, char *buf);
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/* in mitauth.c */
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extern XID MitCheckCookie(AuthCheckArgs);
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extern XID MitGenerateCookie(AuthGenCArgs);
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extern int MitAddCookie(AuthAddCArgs);
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extern int MitFromID(AuthFromIDArgs);
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extern int MitRemoveCookie(AuthRemCArgs);
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extern int MitResetCookie(AuthRstCArgs);
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/* in xdmauth.c */
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#ifdef HASXDMAUTH
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extern XID XdmCheckCookie(AuthCheckArgs);
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extern int XdmAddCookie(AuthAddCArgs);
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extern int XdmFromID(AuthFromIDArgs);
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extern int XdmRemoveCookie(AuthRemCArgs);
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extern int XdmResetCookie(AuthRstCArgs);
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#endif
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/* in rpcauth.c */
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#ifdef SECURE_RPC
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extern void SecureRPCInit(AuthInitArgs);
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extern XID SecureRPCCheck(AuthCheckArgs);
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extern int SecureRPCAdd(AuthAddCArgs);
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extern int SecureRPCFromID(AuthFromIDArgs);
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extern int SecureRPCRemove(AuthRemCArgs);
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extern int SecureRPCReset(AuthRstCArgs);
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#endif
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#ifdef XDMCP
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/* in xdmcp.c */
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extern void XdmcpUseMsg(void);
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extern int XdmcpOptions(int argc, char **argv, int i);
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extern void XdmcpRegisterConnection(int type, const char *address, int addrlen);
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extern void XdmcpRegisterAuthorizations(void);
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extern void XdmcpRegisterAuthorization(const char *name, int namelen);
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extern void XdmcpInit(void);
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extern void XdmcpReset(void);
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extern void XdmcpOpenDisplay(int sock);
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extern void XdmcpCloseDisplay(int sock);
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extern void XdmcpRegisterAuthentication(const char *name,
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int namelen,
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const char *data,
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int datalen,
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ValidatorFunc Validator,
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GeneratorFunc Generator,
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AddAuthorFunc AddAuth);
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struct sockaddr_in;
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extern void XdmcpRegisterBroadcastAddress(const struct sockaddr_in *addr);
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#endif
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#ifdef HASXDMAUTH
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extern void XdmAuthenticationInit(const char *cookie, int cookie_length);
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#endif
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#endif /* _OSDEP_H_ */
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