/* $Xorg: connection.c,v 1.6 2001/02/09 02:05:23 xorgcvs Exp $ */ /*********************************************************** Copyright 1987, 1989, 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. Copyright 1987, 1989 by Digital Equipment Corporation, Maynard, Massachusetts. All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of Digital not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ******************************************************************/ /* $XFree86: xc/programs/Xserver/os/connection.c,v 3.64 2003/10/07 22:50:42 herrb Exp $ */ /***************************************************************** * Stuff to create connections --- OS dependent * * EstablishNewConnections, CreateWellKnownSockets, ResetWellKnownSockets, * CloseDownConnection, CheckConnections, AddEnabledDevice, * RemoveEnabledDevice, OnlyListToOneClient, * ListenToAllClients, * * (WaitForSomething is in its own file) * * In this implementation, a client socket table is not kept. * Instead, what would be the index into the table is just the * file descriptor of the socket. This won't work for if the * socket ids aren't small nums (0 - 2^8) * *****************************************************************/ #ifdef WIN32 #include #endif #include "X.h" #include "Xproto.h" #include #include #include #include #include #ifndef WIN32 #if defined(Lynx) #include #else #include #endif #ifdef hpux #include #include #endif #if defined(DGUX) #include #include #include #include #include #include #include #include #endif #ifdef AIXV3 #include #endif #ifdef __UNIXOS2__ #define select(n,r,w,x,t) os2PseudoSelect(n,r,w,x,t) extern __const__ int _nfiles; #endif #if defined(TCPCONN) || defined(STREAMSCONN) # include # include # if !defined(hpux) # ifdef apollo # ifndef NO_TCP_H # include # endif # else # ifdef CSRG_BASED # include # endif # ifndef __UNIXOS2__ # include # endif # endif # endif # include #endif #if !defined(__UNIXOS2__) #ifndef Lynx #include #else #include #endif #endif #endif /* WIN32 */ #include "misc.h" /* for typedef of pointer */ #include "osdep.h" #include #include "opaque.h" #include "dixstruct.h" #ifdef XAPPGROUP #include "extensions/Xagsrv.h" #endif #ifdef XCSECURITY #define _SECURITY_SERVER #include "extensions/security.h" #endif #ifdef LBX #include "colormapst.h" #include "propertyst.h" #include "lbxserve.h" #include "osdep.h" #endif #ifdef X_NOT_POSIX #define Pid_t int #else #define Pid_t pid_t #endif #ifdef DNETCONN #include #endif /* DNETCONN */ int lastfdesc; /* maximum file descriptor */ fd_set WellKnownConnections; /* Listener mask */ fd_set EnabledDevices; /* mask for input devices that are on */ fd_set AllSockets; /* select on this */ fd_set AllClients; /* available clients */ fd_set LastSelectMask; /* mask returned from last select call */ fd_set ClientsWithInput; /* clients with FULL requests in buffer */ fd_set ClientsWriteBlocked; /* clients who cannot receive output */ fd_set OutputPending; /* clients with reply/event data ready to go */ int MaxClients = 0; Bool NewOutputPending; /* not yet attempted to write some new output */ Bool AnyClientsWriteBlocked; /* true if some client blocked on write */ Bool RunFromSmartParent; /* send SIGUSR1 to parent process */ Bool PartialNetwork; /* continue even if unable to bind all addrs */ static Pid_t ParentProcess; #ifdef __UNIXOS2__ Pid_t GetPPID(Pid_t pid); #endif static Bool debug_conns = FALSE; fd_set IgnoredClientsWithInput; static fd_set GrabImperviousClients; static fd_set SavedAllClients; static fd_set SavedAllSockets; static fd_set SavedClientsWithInput; int GrabInProgress = 0; #if !defined(WIN32) int *ConnectionTranslation = NULL; #else /* * On NT fds are not between 0 and MAXSOCKS, they are unrelated, and there is * not even a known maximum value, so use something quite arbitrary for now. * Do storage is a hash table of size 256. Collisions are handled in a linked * list. */ #undef MAXSOCKS #define MAXSOCKS 500 #undef MAXSELECT #define MAXSELECT 500 #define MAXFD 500 struct _ct_node { struct _ct_node *next; int key; int value; }; struct _ct_node *ct_head[256]; void InitConnectionTranslation(void) { bzero(ct_head, sizeof(ct_head)); } int GetConnectionTranslation(int conn) { struct _ct_node *node = ct_head[conn & 0xff]; while (node != NULL) { if (node->key == conn) return node->value; node = node->next; } return 0; } void SetConnectionTranslation(int conn, int client) { struct _ct_node **node = ct_head + (conn & 0xff); if (client == 0) /* remove entry */ { while (*node != NULL) { if ((*node)->key == conn) { struct _ct_node *temp = *node; *node = (*node)->next; free(temp); return; } node = &((*node)->next); } return; } else { while (*node != NULL) { if ((*node)->key == conn) { (*node)->value = client; return; } node = &((*node)->next); } *node = (struct _ct_node*)xalloc(sizeof(struct _ct_node)); (*node)->next = NULL; (*node)->key = conn; (*node)->value = client; return; } } void ClearConnectionTranslation(void) { unsigned i; for (i = 0; i < 256; i++) { struct _ct_node *node = ct_head[i]; while (node != NULL) { struct _ct_node *temp = node; node = node->next; xfree(temp); } } } #endif XtransConnInfo *ListenTransConns = NULL; int *ListenTransFds = NULL; int ListenTransCount; static void ErrorConnMax(XtransConnInfo /* trans_conn */); #ifndef LBX static void CloseDownFileDescriptor( OsCommPtr /*oc*/ ); #endif static XtransConnInfo lookup_trans_conn (int fd) { if (ListenTransFds) { int i; for (i = 0; i < ListenTransCount; i++) if (ListenTransFds[i] == fd) return ListenTransConns[i]; } return (NULL); } /* Set MaxClients and lastfdesc, and allocate ConnectionTranslation */ void InitConnectionLimits(void) { lastfdesc = -1; #ifndef __CYGWIN__ #ifndef __UNIXOS2__ #if !defined(XNO_SYSCONF) && defined(_SC_OPEN_MAX) lastfdesc = sysconf(_SC_OPEN_MAX) - 1; #endif #ifdef HAS_GETDTABLESIZE if (lastfdesc < 0) lastfdesc = getdtablesize() - 1; #endif #ifdef _NFILE if (lastfdesc < 0) lastfdesc = _NFILE - 1; #endif #else /* __UNIXOS2__ */ lastfdesc = _nfiles - 1; #endif #endif /* __CYGWIN__ */ /* This is the fallback */ if (lastfdesc < 0) lastfdesc = MAXSOCKS; if (lastfdesc > MAXSELECT) lastfdesc = MAXSELECT; if (lastfdesc > MAXCLIENTS) { lastfdesc = MAXCLIENTS; if (debug_conns) ErrorF( "REACHED MAXIMUM CLIENTS LIMIT %d\n", MAXCLIENTS); } MaxClients = lastfdesc; #ifdef DEBUG ErrorF("InitConnectionLimits: MaxClients = %d\n", MaxClients); #endif #if !defined(WIN32) ConnectionTranslation = (int *)xnfalloc(sizeof(int)*(lastfdesc + 1)); #else InitConnectionTranslation(); #endif } /***************** * CreateWellKnownSockets * At initialization, create the sockets to listen on for new clients. *****************/ void CreateWellKnownSockets(void) { int i; int partial; char port[20]; OsSigHandlerPtr handler; FD_ZERO(&AllSockets); FD_ZERO(&AllClients); FD_ZERO(&LastSelectMask); FD_ZERO(&ClientsWithInput); #if !defined(WIN32) for (i=0; i= 0) && (ListenTransCount >= 1)) { if (!PartialNetwork && partial) { FatalError ("Failed to establish all listening sockets"); } else { ListenTransFds = (int *) xalloc (ListenTransCount * sizeof (int)); for (i = 0; i < ListenTransCount; i++) { int fd = _XSERVTransGetConnectionNumber (ListenTransConns[i]); ListenTransFds[i] = fd; FD_SET (fd, &WellKnownConnections); if (!_XSERVTransIsLocal (ListenTransConns[i])) { DefineSelf (fd); } } } } if (!XFD_ANYSET (&WellKnownConnections)) FatalError ("Cannot establish any listening sockets - Make sure an X server isn't already running"); #if !defined(WIN32) OsSignal (SIGPIPE, SIG_IGN); OsSignal (SIGHUP, AutoResetServer); #endif OsSignal (SIGINT, GiveUp); OsSignal (SIGTERM, GiveUp); XFD_COPYSET (&WellKnownConnections, &AllSockets); ResetHosts(display); /* * Magic: If SIGUSR1 was set to SIG_IGN when * the server started, assume that either * * a- The parent process is ignoring SIGUSR1 * * or * * b- The parent process is expecting a SIGUSR1 * when the server is ready to accept connections * * In the first case, the signal will be harmless, * in the second case, the signal will be quite * useful */ #if !defined(WIN32) handler = OsSignal (SIGUSR1, SIG_IGN); if ( handler == SIG_IGN) RunFromSmartParent = TRUE; OsSignal(SIGUSR1, handler); ParentProcess = getppid (); #ifdef __UNIXOS2__ /* * fg030505: under OS/2, xinit is not the parent process but * the "grant parent" process of the server because execvpe() * presents us an additional process number; * GetPPID(pid) is part of libemxfix */ ParentProcess = GetPPID (ParentProcess); #endif /* __UNIXOS2__ */ if (RunFromSmartParent) { if (ParentProcess > 1) { kill (ParentProcess, SIGUSR1); } } #endif #ifdef XDMCP XdmcpInit (); #endif } void ResetWellKnownSockets (void) { int i; ResetOsBuffers(); for (i = 0; i < ListenTransCount; i++) { int status = _XSERVTransResetListener (ListenTransConns[i]); if (status != TRANS_RESET_NOOP) { if (status == TRANS_RESET_FAILURE) { /* * ListenTransConns[i] freed by xtrans. * Remove it from out list. */ FD_CLR (ListenTransFds[i], &WellKnownConnections); ListenTransFds[i] = ListenTransFds[ListenTransCount - 1]; ListenTransConns[i] = ListenTransConns[ListenTransCount - 1]; ListenTransCount -= 1; i -= 1; } else if (status == TRANS_RESET_NEW_FD) { /* * A new file descriptor was allocated (the old one was closed) */ int newfd = _XSERVTransGetConnectionNumber (ListenTransConns[i]); FD_CLR (ListenTransFds[i], &WellKnownConnections); ListenTransFds[i] = newfd; FD_SET(newfd, &WellKnownConnections); } } } ResetAuthorization (); ResetHosts(display); /* * See above in CreateWellKnownSockets about SIGUSR1 */ #if !defined(WIN32) if (RunFromSmartParent) { if (ParentProcess > 1) { kill (ParentProcess, SIGUSR1); } } #endif /* * restart XDMCP */ #ifdef XDMCP XdmcpReset (); #endif } void CloseWellKnownConnections(void) { int i; for (i = 0; i < ListenTransCount; i++) _XSERVTransClose (ListenTransConns[i]); } static void AuthAudit (ClientPtr client, Bool letin, struct sockaddr *saddr, int len, unsigned int proto_n, char *auth_proto, int auth_id) { char addr[128]; char *out = addr; if (!((OsCommPtr)client->osPrivate)->trans_conn) { strcpy(addr, "LBX proxy at "); out += strlen(addr); } if (!len) strcpy(out, "local host"); else switch (saddr->sa_family) { case AF_UNSPEC: #if defined(UNIXCONN) || defined(LOCALCONN) || defined(OS2PIPECONN) case AF_UNIX: #endif strcpy(out, "local host"); break; #if defined(TCPCONN) || defined(STREAMSCONN) || defined(MNX_TCPCONN) case AF_INET: sprintf(out, "IP %s", inet_ntoa(((struct sockaddr_in *) saddr)->sin_addr)); break; #if defined(IPv6) && defined(AF_INET6) case AF_INET6: { char ipaddr[INET6_ADDRSTRLEN]; inet_ntop(AF_INET6, &((struct sockaddr_in6 *) saddr)->sin6_addr, ipaddr, sizeof(ipaddr)); sprintf(out, "IP %s", ipaddr); } break; #endif #endif #ifdef DNETCONN case AF_DECnet: sprintf(out, "DN %s", dnet_ntoa(&((struct sockaddr_dn *) saddr)->sdn_add)); break; #endif default: strcpy(out, "unknown address"); } if (proto_n) AuditF("client %d %s from %s\n Auth name: %.*s ID: %d\n", client->index, letin ? "connected" : "rejected", addr, (int)proto_n, auth_proto, auth_id); else AuditF("client %d %s from %s\n", client->index, letin ? "connected" : "rejected", addr); } XID AuthorizationIDOfClient(ClientPtr client) { if (client->osPrivate) return ((OsCommPtr)client->osPrivate)->auth_id; else return None; } /***************************************************************** * ClientAuthorized * * Sent by the client at connection setup: * typedef struct _xConnClientPrefix { * CARD8 byteOrder; * BYTE pad; * CARD16 majorVersion, minorVersion; * CARD16 nbytesAuthProto; * CARD16 nbytesAuthString; * } xConnClientPrefix; * * It is hoped that eventually one protocol will be agreed upon. In the * mean time, a server that implements a different protocol than the * client expects, or a server that only implements the host-based * mechanism, will simply ignore this information. * *****************************************************************/ char * ClientAuthorized(ClientPtr client, unsigned int proto_n, char *auth_proto, unsigned int string_n, char *auth_string) { OsCommPtr priv; Xtransaddr *from = NULL; int family; int fromlen; XID auth_id; char *reason = NULL; XtransConnInfo trans_conn; int restore_trans_conn = 0; ClientPtr lbxpc = NULL; priv = (OsCommPtr)client->osPrivate; trans_conn = priv->trans_conn; #ifdef LBX if (!trans_conn) { /* * Since trans_conn is NULL, this must be a proxy's client for * which we have NO address. Therefore, we will temporarily * set the client's trans_conn to the proxy's trans_conn and * after CheckAuthorization the client's trans_conn will be * restored. * * If XDM-AUTHORIZATION-1 is being used, CheckAuthorization * will eventually call XdmAuthorizationValidate and this * later function may use the client's trans_conn to get the * client's address. Since a XDM-AUTH-1 auth string includes * the client's address, this address is compared to the address * in the client's trans_conn. If the proxy and client are * on the same host, the comparison will fail; otherwise the * comparison will fail and the client will not be authorized * to connect to the server. * * The basis for this additional code is to prevent a * NULL pointer dereference of the client's trans_conn. * The fundamental problem - the fact that the client's * trans_conn is NULL - is because the NewClient * request in version 1.0 of the LBX protocol does not * send the client's address to the server. When the * spec is changed and the client's address is sent to * server in the NewClient request, this additional code * should be removed. * * See defect number XWSog08218 for more information. */ lbxpc = LbxProxyClient(priv->proxy); trans_conn = ((OsCommPtr)lbxpc->osPrivate)->trans_conn; priv->trans_conn = trans_conn; restore_trans_conn = 1; } #endif auth_id = CheckAuthorization (proto_n, auth_proto, string_n, auth_string, client, &reason); #ifdef LBX if (! priv->trans_conn) { if (auth_id == (XID) ~0L && !GetAccessControl()) auth_id = ((OsCommPtr)lbxpc->osPrivate)->auth_id; #ifdef XCSECURITY else if (auth_id != (XID) ~0L && !SecuritySameLevel(lbxpc, auth_id)) { auth_id = (XID) ~0L; reason = "Client trust level differs from that of LBX Proxy"; } #endif } #endif if (auth_id == (XID) ~0L) { if ( #ifdef XCSECURITY (proto_n == 0 || strncmp (auth_proto, XSecurityAuthorizationName, proto_n) != 0) && #endif _XSERVTransGetPeerAddr (trans_conn, &family, &fromlen, &from) != -1) { if ( #ifdef LBX !trans_conn || #endif InvalidHost ((struct sockaddr *) from, fromlen, client)) AuthAudit(client, FALSE, (struct sockaddr *) from, fromlen, proto_n, auth_proto, auth_id); else { auth_id = (XID) 0; if (auditTrailLevel > 1) AuthAudit(client, TRUE, (struct sockaddr *) from, fromlen, proto_n, auth_proto, auth_id); } xfree ((char *) from); } if (auth_id == (XID) ~0L) { #ifdef LBX /* * Restore client's trans_conn state */ if (restore_trans_conn) { priv->trans_conn = NULL; } #endif if (reason) return reason; else return "Client is not authorized to connect to Server"; } } else if (auditTrailLevel > 1) { if (_XSERVTransGetPeerAddr (trans_conn, &family, &fromlen, &from) != -1) { AuthAudit(client, TRUE, (struct sockaddr *) from, fromlen, proto_n, auth_proto, auth_id); xfree ((char *) from); } } priv->auth_id = auth_id; priv->conn_time = 0; #ifdef XDMCP /* indicate to Xdmcp protocol that we've opened new client */ XdmcpOpenDisplay(priv->fd); #endif /* XDMCP */ #ifdef XAPPGROUP if (ClientStateCallback) XagCallClientStateChange (client); #endif /* At this point, if the client is authorized to change the access control * list, we should getpeername() information, and add the client to * the selfhosts list. It's not really the host machine, but the * true purpose of the selfhosts list is to see who may change the * access control list. */ #ifdef LBX if (restore_trans_conn) { priv->trans_conn = NULL; } #endif return((char *)NULL); } static ClientPtr #ifdef LBX AllocNewConnection (XtransConnInfo trans_conn, int fd, CARD32 conn_time, int (*Flush)( ClientPtr /*who*/, OsCommPtr /*oc*/, char */*extraBuf*/, int /*extraCount*/), void (*Close)( ClientPtr /*client*/), LbxProxyPtr proxy) #else AllocNewConnection (XtransConnInfo trans_conn, int fd, CARD32 conn_time) #endif { OsCommPtr oc; ClientPtr client; if ( #ifdef LBX trans_conn && #endif #ifndef WIN32 fd >= lastfdesc #else XFD_SETCOUNT(&AllClients) >= MaxClients #endif ) return NullClient; oc = (OsCommPtr)xalloc(sizeof(OsCommRec)); if (!oc) return NullClient; oc->trans_conn = trans_conn; oc->fd = fd; oc->input = (ConnectionInputPtr)NULL; oc->output = (ConnectionOutputPtr)NULL; oc->auth_id = None; oc->conn_time = conn_time; #ifdef LBX oc->proxy = proxy; oc->Flush = Flush; oc->Close = Close; oc->largereq = (ConnectionInputPtr) NULL; #endif if (!(client = NextAvailableClient((pointer)oc))) { xfree (oc); return NullClient; } #ifdef LBX if (trans_conn) #endif { #if !defined(WIN32) ConnectionTranslation[fd] = client->index; #else SetConnectionTranslation(fd, client->index); #endif if (GrabInProgress) { FD_SET(fd, &SavedAllClients); FD_SET(fd, &SavedAllSockets); } else { FD_SET(fd, &AllClients); FD_SET(fd, &AllSockets); } } #ifdef DEBUG ErrorF("AllocNewConnection: client index = %d, socket fd = %d\n", client->index, fd); #endif return client; } #ifdef LBX int ClientConnectionNumber (ClientPtr client) { OsCommPtr oc = (OsCommPtr) client->osPrivate; return oc->fd; } ClientPtr AllocLbxClientConnection (ClientPtr client, LbxProxyPtr proxy) { OsCommPtr oc = (OsCommPtr) client->osPrivate; return AllocNewConnection ((XtransConnInfo)NULL, oc->fd, GetTimeInMillis(), LbxFlushClient, LbxCloseClient, proxy); } void LbxProxyConnection (ClientPtr client, LbxProxyPtr proxy) { OsCommPtr oc = (OsCommPtr) client->osPrivate; FlushClient(client, oc, (char *)NULL, 0); oc->proxy = proxy; oc->Flush = LbxFlushClient; oc->Close = LbxCloseClient; LbxPrimeInput(client, proxy); } #endif /***************** * EstablishNewConnections * If anyone is waiting on listened sockets, accept them. * Returns a mask with indices of new clients. Updates AllClients * and AllSockets. *****************/ /*ARGSUSED*/ Bool EstablishNewConnections(ClientPtr clientUnused, pointer closure) { fd_set readyconnections; /* set of listeners that are ready */ int curconn; /* fd of listener that's ready */ register int newconn; /* fd of new client */ CARD32 connect_time; register int i; register ClientPtr client; register OsCommPtr oc; fd_set tmask; XFD_ANDSET (&tmask, (fd_set*)closure, &WellKnownConnections); XFD_COPYSET(&tmask, &readyconnections); if (!XFD_ANYSET(&readyconnections)) return TRUE; connect_time = GetTimeInMillis(); /* kill off stragglers */ for (i=1; iosPrivate); if ((oc && (oc->conn_time != 0) && (connect_time - oc->conn_time) >= TimeOutValue) || (client->noClientException != Success && !client->clientGone)) CloseDownClient(client); } } #ifndef WIN32 for (i = 0; i < howmany(XFD_SETSIZE, NFDBITS); i++) { while (readyconnections.fds_bits[i]) #else for (i = 0; i < XFD_SETCOUNT(&readyconnections); i++) #endif { XtransConnInfo trans_conn, new_trans_conn; int status; #ifndef WIN32 curconn = ffs (readyconnections.fds_bits[i]) - 1; readyconnections.fds_bits[i] &= ~((fd_mask)1 << curconn); curconn += (i * (sizeof(fd_mask)*8)); #else curconn = XFD_FD(&readyconnections, i); #endif if ((trans_conn = lookup_trans_conn (curconn)) == NULL) continue; if ((new_trans_conn = _XSERVTransAccept (trans_conn, &status)) == NULL) continue; newconn = _XSERVTransGetConnectionNumber (new_trans_conn); if (newconn < lastfdesc) { int clientid; #if !defined(WIN32) clientid = ConnectionTranslation[newconn]; #else clientid = GetConnectionTranslation(newconn); #endif if(clientid && (client = clients[clientid])) CloseDownClient(client); } _XSERVTransSetOption(new_trans_conn, TRANS_NONBLOCKING, 1); if (!AllocNewConnection (new_trans_conn, newconn, connect_time #ifdef LBX , StandardFlushClient, CloseDownFileDescriptor, (LbxProxyPtr)NULL #endif )) { ErrorConnMax(new_trans_conn); _XSERVTransClose(new_trans_conn); } } #ifndef WIN32 } #endif return TRUE; } #define NOROOM "Maximum number of clients reached" /************ * ErrorConnMax * Fail a connection due to lack of client or file descriptor space ************/ static void ErrorConnMax(XtransConnInfo trans_conn) { int fd = _XSERVTransGetConnectionNumber (trans_conn); xConnSetupPrefix csp; char pad[3]; struct iovec iov[3]; char byteOrder = 0; int whichbyte = 1; struct timeval waittime; fd_set mask; /* if these seems like a lot of trouble to go to, it probably is */ waittime.tv_sec = BOTIMEOUT / MILLI_PER_SECOND; waittime.tv_usec = (BOTIMEOUT % MILLI_PER_SECOND) * (1000000 / MILLI_PER_SECOND); FD_ZERO(&mask); FD_SET(fd, &mask); (void)Select(fd + 1, &mask, NULL, NULL, &waittime); /* try to read the byte-order of the connection */ (void)_XSERVTransRead(trans_conn, &byteOrder, 1); if ((byteOrder == 'l') || (byteOrder == 'B')) { csp.success = xFalse; csp.lengthReason = sizeof(NOROOM) - 1; csp.length = (sizeof(NOROOM) + 2) >> 2; csp.majorVersion = X_PROTOCOL; csp.minorVersion = X_PROTOCOL_REVISION; if (((*(char *) &whichbyte) && (byteOrder == 'B')) || (!(*(char *) &whichbyte) && (byteOrder == 'l'))) { swaps(&csp.majorVersion, whichbyte); swaps(&csp.minorVersion, whichbyte); swaps(&csp.length, whichbyte); } iov[0].iov_len = sz_xConnSetupPrefix; iov[0].iov_base = (char *) &csp; iov[1].iov_len = csp.lengthReason; iov[1].iov_base = NOROOM; iov[2].iov_len = (4 - (csp.lengthReason & 3)) & 3; iov[2].iov_base = pad; (void)_XSERVTransWritev(trans_conn, iov, 3); } } /************ * CloseDownFileDescriptor: * Remove this file descriptor and it's I/O buffers, etc. ************/ #ifdef LBX void CloseDownFileDescriptor(ClientPtr client) #else static void CloseDownFileDescriptor(OsCommPtr oc) #endif { #ifdef LBX OsCommPtr oc = (OsCommPtr) client->osPrivate; #endif int connection = oc->fd; if (oc->trans_conn) { _XSERVTransDisconnect(oc->trans_conn); _XSERVTransClose(oc->trans_conn); } #ifndef LBX FreeOsBuffers(oc); xfree(oc); #endif #ifndef WIN32 ConnectionTranslation[connection] = 0; #else SetConnectionTranslation(connection, 0); #endif FD_CLR(connection, &AllSockets); FD_CLR(connection, &AllClients); FD_CLR(connection, &ClientsWithInput); FD_CLR(connection, &GrabImperviousClients); if (GrabInProgress) { FD_CLR(connection, &SavedAllSockets); FD_CLR(connection, &SavedAllClients); FD_CLR(connection, &SavedClientsWithInput); } FD_CLR(connection, &ClientsWriteBlocked); if (!XFD_ANYSET(&ClientsWriteBlocked)) AnyClientsWriteBlocked = FALSE; FD_CLR(connection, &OutputPending); } /***************** * CheckConnections * Some connection has died, go find which one and shut it down * The file descriptor has been closed, but is still in AllClients. * If would truly be wonderful if select() would put the bogus * file descriptors in the exception mask, but nooooo. So we have * to check each and every socket individually. *****************/ void CheckConnections(void) { #ifndef WIN32 fd_mask mask; #endif fd_set tmask; int curclient, curoff; int i; struct timeval notime; int r; #ifdef WIN32 fd_set savedAllClients; #endif notime.tv_sec = 0; notime.tv_usec = 0; #ifndef WIN32 for (i=0; iosPrivate; if (oc->output && oc->output->count) FlushClient(client, oc, (char *)NULL, 0); #ifdef XDMCP XdmcpCloseDisplay(oc->fd); #endif #ifndef LBX CloseDownFileDescriptor(oc); #else (*oc->Close) (client); FreeOsBuffers(oc); xfree(oc); #endif client->osPrivate = (pointer)NULL; if (auditTrailLevel > 1) AuditF("client %d disconnected\n", client->index); } void AddEnabledDevice(int fd) { FD_SET(fd, &EnabledDevices); FD_SET(fd, &AllSockets); if (GrabInProgress) FD_SET(fd, &SavedAllSockets); } void RemoveEnabledDevice(int fd) { FD_CLR(fd, &EnabledDevices); FD_CLR(fd, &AllSockets); if (GrabInProgress) FD_CLR(fd, &SavedAllSockets); } /***************** * OnlyListenToOneClient: * Only accept requests from one client. Continue to handle new * connections, but don't take any protocol requests from the new * ones. Note that if GrabInProgress is set, EstablishNewConnections * needs to put new clients into SavedAllSockets and SavedAllClients. * Note also that there is no timeout for this in the protocol. * This routine is "undone" by ListenToAllClients() *****************/ void OnlyListenToOneClient(ClientPtr client) { OsCommPtr oc = (OsCommPtr)client->osPrivate; int connection = oc->fd; if (! GrabInProgress) { XFD_COPYSET(&ClientsWithInput, &SavedClientsWithInput); XFD_ANDSET(&ClientsWithInput, &ClientsWithInput, &GrabImperviousClients); if (FD_ISSET(connection, &SavedClientsWithInput)) { FD_CLR(connection, &SavedClientsWithInput); FD_SET(connection, &ClientsWithInput); } XFD_UNSET(&SavedClientsWithInput, &GrabImperviousClients); XFD_COPYSET(&AllSockets, &SavedAllSockets); XFD_COPYSET(&AllClients, &SavedAllClients); XFD_UNSET(&AllSockets, &AllClients); XFD_ANDSET(&AllClients, &AllClients, &GrabImperviousClients); FD_SET(connection, &AllClients); XFD_ORSET(&AllSockets, &AllSockets, &AllClients); GrabInProgress = client->index; } } /**************** * ListenToAllClients: * Undoes OnlyListentToOneClient() ****************/ void ListenToAllClients(void) { if (GrabInProgress) { XFD_ORSET(&AllSockets, &AllSockets, &SavedAllSockets); XFD_ORSET(&AllClients, &AllClients, &SavedAllClients); XFD_ORSET(&ClientsWithInput, &ClientsWithInput, &SavedClientsWithInput); GrabInProgress = 0; } } /**************** * IgnoreClient * Removes one client from input masks. * Must have cooresponding call to AttendClient. ****************/ void IgnoreClient (ClientPtr client) { OsCommPtr oc = (OsCommPtr)client->osPrivate; int connection = oc->fd; #ifdef LBX LbxClientPtr lbxClient = LbxClient(client); #endif isItTimeToYield = TRUE; #ifdef LBX if (lbxClient) { lbxClient->ignored = TRUE; return; } #endif if (!GrabInProgress || FD_ISSET(connection, &AllClients)) { if (FD_ISSET (connection, &ClientsWithInput)) FD_SET(connection, &IgnoredClientsWithInput); else FD_CLR(connection, &IgnoredClientsWithInput); FD_CLR(connection, &ClientsWithInput); FD_CLR(connection, &AllSockets); FD_CLR(connection, &AllClients); FD_CLR(connection, &LastSelectMask); } else { if (FD_ISSET (connection, &SavedClientsWithInput)) FD_SET(connection, &IgnoredClientsWithInput); else FD_CLR(connection, &IgnoredClientsWithInput); FD_CLR(connection, &SavedClientsWithInput); FD_CLR(connection, &SavedAllSockets); FD_CLR(connection, &SavedAllClients); } } /**************** * AttendClient * Adds one client back into the input masks. ****************/ void AttendClient (ClientPtr client) { OsCommPtr oc = (OsCommPtr)client->osPrivate; int connection = oc->fd; #ifdef LBX LbxClientPtr lbxClient = LbxClient(client); if (lbxClient) { lbxClient->ignored = FALSE; return; } #endif if (!GrabInProgress || GrabInProgress == client->index || FD_ISSET(connection, &GrabImperviousClients)) { FD_SET(connection, &AllClients); FD_SET(connection, &AllSockets); FD_SET(connection, &LastSelectMask); if (FD_ISSET (connection, &IgnoredClientsWithInput)) FD_SET(connection, &ClientsWithInput); } else { FD_SET(connection, &SavedAllClients); FD_SET(connection, &SavedAllSockets); if (FD_ISSET(connection, &IgnoredClientsWithInput)) FD_SET(connection, &SavedClientsWithInput); } } /* make client impervious to grabs; assume only executing client calls this */ void MakeClientGrabImpervious(ClientPtr client) { OsCommPtr oc = (OsCommPtr)client->osPrivate; int connection = oc->fd; FD_SET(connection, &GrabImperviousClients); if (ServerGrabCallback) { ServerGrabInfoRec grabinfo; grabinfo.client = client; grabinfo.grabstate = CLIENT_IMPERVIOUS; CallCallbacks(&ServerGrabCallback, &grabinfo); } } /* make client pervious to grabs; assume only executing client calls this */ void MakeClientGrabPervious(ClientPtr client) { OsCommPtr oc = (OsCommPtr)client->osPrivate; int connection = oc->fd; FD_CLR(connection, &GrabImperviousClients); if (GrabInProgress && (GrabInProgress != client->index)) { if (FD_ISSET(connection, &ClientsWithInput)) { FD_SET(connection, &SavedClientsWithInput); FD_CLR(connection, &ClientsWithInput); } FD_CLR(connection, &AllSockets); FD_CLR(connection, &AllClients); isItTimeToYield = TRUE; } if (ServerGrabCallback) { ServerGrabInfoRec grabinfo; grabinfo.client = client; grabinfo.grabstate = CLIENT_PERVIOUS; CallCallbacks(&ServerGrabCallback, &grabinfo); } }