/* $Xorg: connection.c,v 1.5 2001/02/09 02:05:44 xorgcvs Exp $ */ /* * handles connections */ /* Copyright 1990, 1991, 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 1990, 1991 Network Computing Devices; * Portions Copyright 1987 by Digital Equipment Corporation * * 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, and that the names of Network Computing Devices, or Digital * not be used in advertising or publicity pertaining to distribution * of the software without specific, written prior permission. * * NETWORK COMPUTING DEVICES, AND DIGITAL DISCLAIM ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL NETWORK COMPUTING DEVICES, * OR 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. */ /* * Copyright 1990, 1991 Network Computing Devices; * Portions Copyright 1987 by Digital Equipment Corporation * * 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, and that the names of Network Computing Devices, or Digital * not be used in advertising or publicity pertaining to distribution * of the software without specific, written prior permission. * * NETWORK COMPUTING DEVICES, AND DIGITAL DISCLAIM ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL NETWORK COMPUTING DEVICES, * OR 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/xfs/os/connection.c,v 3.25tsi Exp $ */ #include #include #include #include "misc.h" #include #include #include #ifndef Lynx #include #include #ifndef __UNIXOS2__ #include #endif #else #include #include #endif #include #include "FS.h" #include "FSproto.h" #include "clientstr.h" #include "X11/Xpoll.h" #include "osdep.h" #include "globals.h" #include "osstruct.h" #include "servermd.h" #include "dispatch.h" #include "fsevents.h" #ifdef __UNIXOS2__ #define _NFILE OPEN_MAX #define select(n,r,w,x,t) os2PseudoSelect(n,r,w,x,t) #endif int ListenPort = DEFAULT_FS_PORT; /* port to listen on */ int lastfdesc; fd_set WellKnownConnections; fd_set AllSockets; fd_set AllClients; fd_set LastSelectMask; fd_set ClientsWithInput; fd_set ClientsWriteBlocked; fd_set OutputPending; long OutputBufferSize = BUFSIZE; Bool NewOutputPending; Bool AnyClientsWriteBlocked; int ConnectionTranslation[MAXSOCKS]; XtransConnInfo *ListenTransConns = NULL; int *ListenTransFds = NULL; int ListenTransCount; static void error_conn_max(XtransConnInfo trans_conn); static void close_fd(OsCommPtr oc); 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); } void StopListening(void) { int i; for (i = 0; i < ListenTransCount; i++) { FD_CLR (ListenTransFds[i], &AllSockets); _FontTransCloseForCloning (ListenTransConns[i]); } free ((char *) ListenTransFds); free ((char *) ListenTransConns); ListenTransFds = NULL; ListenTransConns = NULL; } /* * creates the sockets for listening to clients * * only called when server first started */ void CreateSockets(int old_listen_count, OldListenRec *old_listen) { int i; FD_ZERO(&AllSockets); FD_ZERO(&AllClients); FD_ZERO(&LastSelectMask); FD_ZERO(&ClientsWithInput); FD_ZERO(&WellKnownConnections); for (i = 0; i < MAXSOCKS; i++) ConnectionTranslation[i] = 0; #ifdef XNO_SYSCONF /* should only be on FreeBSD 1.x and NetBSD 0.x */ #undef _SC_OPEN_MAX #endif #ifdef _SC_OPEN_MAX lastfdesc = sysconf(_SC_OPEN_MAX) - 1; #else #if defined(hpux) || defined(__UNIXOS2__) lastfdesc = _NFILE - 1; #else lastfdesc = getdtablesize() - 1; #endif /* hpux */ #endif if (lastfdesc > MAXSOCKS) { lastfdesc = MAXSOCKS; } if (old_listen_count > 0) { /* * The font server cloned itself. Re-use previously opened * transports for listening. */ ListenTransConns = (XtransConnInfo *) malloc ( old_listen_count * sizeof (XtransConnInfo)); ListenTransFds = (int *) malloc (old_listen_count * sizeof (int)); ListenTransCount = 0; for (i = 0; i < old_listen_count; i++) { char portnum[10]; if (old_listen[i].portnum != ListenPort) continue; /* this should never happen */ else sprintf (portnum, "%d", old_listen[i].portnum); if ((ListenTransConns[ListenTransCount] = _FontTransReopenCOTSServer (old_listen[i].trans_id, old_listen[i].fd, portnum)) != NULL) { ListenTransFds[ListenTransCount] = old_listen[i].fd; FD_SET (old_listen[i].fd, &WellKnownConnections); NoticeF("reusing existing file descriptor %d\n", old_listen[i].fd); ListenTransCount++; } } } else { char port[20]; int partial; sprintf (port, "%d", ListenPort); if ((_FontTransMakeAllCOTSServerListeners (port, &partial, &ListenTransCount, &ListenTransConns) >= 0) && (ListenTransCount >= 1)) { ListenTransFds = (int *) malloc (ListenTransCount * sizeof (int)); for (i = 0; i < ListenTransCount; i++) { int fd = _FontTransGetConnectionNumber (ListenTransConns[i]); ListenTransFds[i] = fd; FD_SET (fd, &WellKnownConnections); } } } if (! XFD_ANYSET(&WellKnownConnections)) FatalError("cannot establish any listening sockets\n"); /* set up all the signal handlers */ signal(SIGPIPE, SIG_IGN); signal(SIGHUP, AutoResetServer); signal(SIGINT, GiveUp); signal(SIGTERM, GiveUp); signal(SIGUSR1, ServerReconfig); signal(SIGUSR2, ServerCacheFlush); signal(SIGCHLD, CleanupChild); XFD_COPYSET (&WellKnownConnections, &AllSockets); } /* * called when server cycles */ void ResetSockets(void) { } void CloseSockets(void) { int i; for (i = 0; i < ListenTransCount; i++) _FontTransClose (ListenTransConns[i]); } /* * accepts new connections */ void MakeNewConnections(void) { fd_mask readyconnections; int curconn; int newconn; long connect_time; int i; ClientPtr client; OsCommPtr oc; fd_set tmask; XFD_ANDSET (&tmask, &LastSelectMask, &WellKnownConnections); readyconnections = tmask.fds_bits[0]; if (!readyconnections) return; connect_time = GetTimeInMillis(); /* kill off stragglers */ for (i = MINCLIENT; i < currentMaxClients; i++) { if ((client = clients[i]) != NullClient) { oc = (OsCommPtr) client->osPrivate; if ((oc && (oc->conn_time != 0) && (connect_time - oc->conn_time) >= TimeOutValue) || ((client->noClientException != FSSuccess) && (client->clientGone != CLIENT_GONE))) CloseDownClient(client); } } while (readyconnections) { XtransConnInfo trans_conn, new_trans_conn; int status; curconn = ffs(readyconnections) - 1; readyconnections &= ~(1 << curconn); if ((trans_conn = lookup_trans_conn (curconn)) == NULL) continue; if ((new_trans_conn = _FontTransAccept (trans_conn, &status)) == NULL) continue; newconn = _FontTransGetConnectionNumber (new_trans_conn); _FontTransSetOption(new_trans_conn, TRANS_NONBLOCKING, 1); oc = (OsCommPtr) fsalloc(sizeof(OsCommRec)); if (!oc) { fsfree(oc); error_conn_max(new_trans_conn); _FontTransClose(new_trans_conn); continue; } FD_SET(newconn, &AllClients); FD_SET(newconn, &AllSockets); oc->fd = newconn; oc->trans_conn = new_trans_conn; oc->input = (ConnectionInputPtr) NULL; oc->output = (ConnectionOutputPtr) NULL; oc->conn_time = connect_time; if ((newconn < lastfdesc) && (client = NextAvailableClient((pointer) oc))) { ConnectionTranslation[newconn] = client->index; } else { error_conn_max(new_trans_conn); close_fd(oc); } } } #define NOROOM "maximum number of clients reached" static void error_conn_max(XtransConnInfo trans_conn) { int fd = _FontTransGetConnectionNumber (trans_conn); fsConnSetup conn; char pad[3]; char byteOrder = 0; int whichbyte = 1; struct timeval waittime; fd_set mask; waittime.tv_usec = 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 byteorder of the connection */ (void) _FontTransRead(trans_conn, &byteOrder, 1); if ((byteOrder == 'l') || (byteOrder == 'B')) { int num_alts; AlternateServerPtr altservers, as; int i, altlen = 0; num_alts = ListAlternateServers(&altservers); conn.status = AuthDenied; conn.major_version = FS_PROTOCOL; conn.minor_version = FS_PROTOCOL_MINOR; conn.num_alternates = num_alts; for (i = 0, as = altservers; i < num_alts; i++, as++) { altlen += (2 + as->namelen + 3) >> 2; } conn.alternate_len = altlen; /* blow off the auth info */ conn.auth_index = 0; conn.auth_len = 0; if (((*(char *) &whichbyte) && (byteOrder == 'B')) || (!(*(char *) &whichbyte) && (byteOrder == 'l'))) { conn.status = lswaps(conn.status); conn.major_version = lswaps(conn.major_version); conn.minor_version = lswaps(conn.minor_version); conn.alternate_len = lswaps(conn.alternate_len); } (void) _FontTransWrite(trans_conn, (char *) &conn, SIZEOF(fsConnSetup)); /* dump alternates */ for (i = 0, as = altservers; i < num_alts; i++, as++) { (void) _FontTransWrite(trans_conn, (char *) as, 2); /* XXX */ (void) _FontTransWrite(trans_conn, (char *) as->name, as->namelen); altlen = 2 + as->namelen; /* pad it */ if (altlen & 3) (void) _FontTransWrite(trans_conn, (char *) pad, ((4 - (altlen & 3)) & 3)); } } } static void close_fd(OsCommPtr oc) { int fd = oc->fd; if (oc->trans_conn) _FontTransClose(oc->trans_conn); FreeOsBuffers(oc); FD_CLR(fd, &AllSockets); FD_CLR(fd, &AllClients); FD_CLR(fd, &ClientsWithInput); FD_CLR(fd, &ClientsWriteBlocked); if (!XFD_ANYSET(&ClientsWriteBlocked)) AnyClientsWriteBlocked = FALSE; FD_CLR(fd, &OutputPending); fsfree(oc); } void CheckConnections(void) { fd_set mask; fd_set tmask; int curclient; int i; struct timeval notime; int r; notime.tv_sec = 0; notime.tv_usec = 0; XFD_COPYSET(&AllClients, &mask); for (i = 0; i < howmany(XFD_SETSIZE, NFDBITS); i++) { while (mask.fds_bits[i]) { curclient = ffs(mask.fds_bits[i]) - 1 + (i << 5); FD_ZERO(&tmask); FD_SET(curclient, &tmask); r = Select(curclient + 1, &tmask, NULL, NULL, ¬ime); if (r < 0) CloseDownClient(clients[ConnectionTranslation[curclient]]); FD_CLR(curclient, &mask); } } } void CloseDownConnection(ClientPtr client) { OsCommPtr oc = (OsCommPtr) client->osPrivate; if (oc->output && oc->output->count) FlushClient(client, oc, (char *) NULL, 0, 0); ConnectionTranslation[oc->fd] = 0; close_fd(oc); client->osPrivate = (pointer) NULL; } /**************** * IgnoreClient * Removes one client from input masks. * Must have cooresponding call to AttendClient. ****************/ static fd_set IgnoredClientsWithInput; void IgnoreClient(ClientPtr client) { OsCommPtr oc = (OsCommPtr) client->osPrivate; int connection = oc->fd; 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); isItTimeToYield = TRUE; } /**************** * AttendClient * Adds one client back into the input masks. ****************/ void AttendClient(ClientPtr client) { OsCommPtr oc = (OsCommPtr) client->osPrivate; int connection = oc->fd; FD_SET(connection, &AllClients); FD_SET(connection, &AllSockets); FD_SET(connection, &LastSelectMask); if (FD_ISSET(connection, &IgnoredClientsWithInput)) FD_SET(connection, &ClientsWithInput); } /* * figure out which clients need to be toasted */ void ReapAnyOldClients(void) { int i; long cur_time = GetTimeInMillis(); ClientPtr client; #ifdef DEBUG fprintf(stderr, "looking for clients to reap\n"); #endif for (i = MINCLIENT; i < currentMaxClients; i++) { client = clients[i]; if (client) { if ((cur_time - client->last_request_time) >= ReapClientTime) { if (client->clientGone == CLIENT_AGED) { client->clientGone = CLIENT_TIMED_OUT; #ifdef DEBUG fprintf(stderr, "reaping client #%d\n", i); #endif CloseDownClient(client); } else { client->clientGone = CLIENT_AGED; SendKeepAliveEvent(client); } } } } }