/* $TOG: connection.c /main/34 1997/06/06 11:35:03 barstow $ */ /* * handles connections */ /* Copyright (c) 1990, 1991 X Consortium Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: 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 X CONSORTIUM 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 X Consortium 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 X Consortium. * 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 3.11.2.3 1998/11/05 14:03:13 dawes Exp $ */ #include #include "misc.h" #include #include #include #ifdef linux /* #include */ #endif #ifndef MINIX #ifndef Lynx #include #include #ifndef __EMX__ #include #endif #else #include #include #endif #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" #ifdef MINIX #include #define select(n,r,w,x,t) nbio_select(n,r,w,x,t) #endif #ifdef __EMX__ #define _NFILE OPEN_MAX #define select(n,r,w,x,t) os2PseudoSelect(n,r,w,x,t) #endif #ifdef X_NOT_STDC_ENV extern int errno; #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; extern long MaxClients; long OutputBufferSize = BUFSIZE; Bool NewOutputPending; Bool AnyClientsWriteBlocked; int ConnectionTranslation[MAXSOCKS]; XtransConnInfo *ListenTransConns = NULL; int *ListenTransFds = NULL; int ListenTransCount; extern ClientPtr NextAvailableClient(); #ifdef SIGNALRETURNSINT #define SIGVAL int #else #define SIGVAL void #endif extern SIGVAL AutoResetServer(); extern SIGVAL GiveUp(); extern SIGVAL ServerReconfig(); extern SIGVAL ServerCacheFlush(); extern SIGVAL CleanupChild(); extern void FreeOsBuffers(); static void error_conn_max(); static void close_fd(); static XtransConnInfo lookup_trans_conn (fd) int fd; { if (ListenTransFds) { int i; for (i = 0; i < ListenTransCount; i++) if (ListenTransFds[i] == fd) return ListenTransConns[i]; } return (NULL); } StopListening() { 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(old_listen_count, old_listen) int old_listen_count; OldListenRec *old_listen; { int request, 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(__EMX__) 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 */ ResetSockets() { } void CloseSockets() { int i; for (i = 0; i < ListenTransCount; i++) _FontTransClose (ListenTransConns[i]); } /* * accepts new connections */ void MakeNewConnections() { 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(trans_conn) 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(oc) 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); } CheckConnections() { 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); } } } CloseDownConnection(client) 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; IgnoreClient(client) 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. ****************/ AttendClient(client) 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 */ ReapAnyOldClients() { int i; long cur_time = GetTimeInMillis(); ClientPtr client; extern void SendKeepAliveEvent(); #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); } } } } }