/* $XConsortium: xdmcp.c,v 1.15 94/09/19 20:16:38 converse Exp $ */ /* $XFree86: xc/programs/xdm/xdmcp.c,v 3.2 1995/01/12 05:57:08 dawes Exp $ */ /* Copyright (c) 1988 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. */ /* * xdm - display manager daemon * Author: Keith Packard, MIT X Consortium * * xdmcp.c - Support for XDMCP */ # include "dm.h" #ifdef XDMCP # include # include # include # include #ifndef MINIX #include #include #ifndef X_NO_SYS_UN #include #endif #include #else /* MINIX */ #include #include #endif /* !MINIX */ #ifdef X_NOT_STDC_ENV #define Time_t long extern Time_t time (); #else #include #define Time_t time_t #endif #ifdef MINIX struct sockaddr_un { u16_t sun_family; char sun_path[62]; }; static char read_buffer[XDM_MAX_MSGLEN+sizeof(udp_io_hdr_t)]; static int read_inprogress; static int read_size; #define select(n,r,w,x,t) nbio_select(n,r,w,x,t) #endif #define getString(name,len) ((name = malloc (len + 1)) ? 1 : 0) /* * interface to policy routines */ extern ARRAY8Ptr ChooseAuthentication (); extern int Willing (); extern ARRAY8Ptr Accept (); extern int SelectConnectionTypeIndex (); int xdmcpFd = -1; int chooserFd = -1; FD_TYPE WellKnownSocketsMask; int WellKnownSocketsMax; #define pS(s) ((s) ? ((char *) (s)) : "empty string") DestroyWellKnownSockets () { if (xdmcpFd != -1) { close (xdmcpFd); xdmcpFd = -1; } if (chooserFd != -1) { close (chooserFd); chooserFd = -1; } } AnyWellKnownSockets () { return xdmcpFd != -1 || chooserFd != -1; } static XdmcpBuffer buffer; /*ARGSUSED*/ static void sendForward (connectionType, address, closure) CARD16 connectionType; ARRAY8Ptr address; char *closure; { #ifdef AF_INET struct sockaddr_in in_addr; #endif #ifdef AF_DECnet #endif struct sockaddr *addr; int addrlen; switch (connectionType) { #ifdef AF_INET case FamilyInternet: addr = (struct sockaddr *) &in_addr; bzero ((char *) &in_addr, sizeof (in_addr)); #ifdef BSD44SOCKETS in_addr.sin_len = sizeof(in_addr); #endif in_addr.sin_family = AF_INET; in_addr.sin_port = htons ((short) XDM_UDP_PORT); if (address->length != 4) return; memmove( (char *) &in_addr.sin_addr, address->data, address->length); addrlen = sizeof (struct sockaddr_in); break; #endif #ifdef AF_DECnet case FamilyDECnet: #endif default: return; } XdmcpFlush (xdmcpFd, &buffer, addr, addrlen); } extern char *NetaddrAddress(); extern char *NetaddrPort(); static void ClientAddress (from, addr, port, type) struct sockaddr *from; ARRAY8Ptr addr, port; /* return */ CARD16 *type; /* return */ { int length, family; char *data; data = NetaddrPort(from, &length); XdmcpAllocARRAY8 (port, length); memmove( port->data, data, length); port->length = length; family = ConvertAddr(from, &length, &data); XdmcpAllocARRAY8 (addr, length); memmove( addr->data, data, length); addr->length = length; *type = family; } static void all_query_respond (from, fromlen, authenticationNames, type) struct sockaddr *from; int fromlen; ARRAYofARRAY8Ptr authenticationNames; xdmOpCode type; { ARRAY8Ptr authenticationName; ARRAY8 status; ARRAY8 addr; CARD16 connectionType; int family; int length; family = ConvertAddr(from, &length, &(addr.data)); addr.length = length; /* convert int to short */ Debug ("all_query_respond: conntype=%d, addr=%lx, len=%d\n", family, *(addr.data), addr.length); if (family < 0) return; connectionType = family; if (type == INDIRECT_QUERY) RememberIndirectClient (&addr, connectionType); else ForgetIndirectClient (&addr, connectionType); authenticationName = ChooseAuthentication (authenticationNames); if (Willing (&addr, connectionType, authenticationName, &status, type)) send_willing (from, fromlen, authenticationName, &status); else if (type == QUERY) send_unwilling (from, fromlen, authenticationName, &status); XdmcpDisposeARRAY8 (&status); } static void indirect_respond (from, fromlen, length) struct sockaddr *from; int fromlen; int length; { ARRAYofARRAY8 queryAuthenticationNames; ARRAY8 clientAddress; ARRAY8 clientPort; CARD16 connectionType; int expectedLen; int i; XdmcpHeader header; int localHostAsWell; Debug ("Indirect respond %d\n", length); if (!XdmcpReadARRAYofARRAY8 (&buffer, &queryAuthenticationNames)) return; expectedLen = 1; for (i = 0; i < (int)queryAuthenticationNames.length; i++) expectedLen += 2 + queryAuthenticationNames.data[i].length; if (length == expectedLen) { ClientAddress (from, &clientAddress, &clientPort, &connectionType); /* * set up the forward query packet */ header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16) FORWARD_QUERY; header.length = 0; header.length += 2 + clientAddress.length; header.length += 2 + clientPort.length; header.length += 1; for (i = 0; i < (int)queryAuthenticationNames.length; i++) header.length += 2 + queryAuthenticationNames.data[i].length; XdmcpWriteHeader (&buffer, &header); XdmcpWriteARRAY8 (&buffer, &clientAddress); XdmcpWriteARRAY8 (&buffer, &clientPort); XdmcpWriteARRAYofARRAY8 (&buffer, &queryAuthenticationNames); localHostAsWell = ForEachMatchingIndirectHost (&clientAddress, connectionType, sendForward, (char *) 0); XdmcpDisposeARRAY8 (&clientAddress); XdmcpDisposeARRAY8 (&clientPort); if (localHostAsWell) all_query_respond (from, fromlen, &queryAuthenticationNames, INDIRECT_QUERY); } else { Debug ("Indirect length error got %d expect %d\n", length, expectedLen); } XdmcpDisposeARRAYofARRAY8 (&queryAuthenticationNames); } static void ProcessRequestSocket () { XdmcpHeader header; struct sockaddr_in addr; int addrlen = sizeof addr; #ifdef MINIX int r; #endif #ifdef MINIX if (read_inprogress) abort(); if (read_size == 0) { r= read(xdmcpFd, read_buffer, sizeof(read_buffer)); if (r == -1 && errno == EINPROGRESS) { read_inprogress= 1; nbio_inprogress(xdmcpFd, ASIO_READ, 1 /* read */, 0 /* write */, 0 /* exception */); } else if (r <= 0) { LogError("read error: %s\n", r == 0 ? "EOF" : strerror(errno)); return; } } #endif Debug ("ProcessRequestSocket\n"); bzero ((char *) &addr, sizeof (addr)); #ifdef MINIX if (!MNX_XdmcpFill (xdmcpFd, &buffer, &addr, &addrlen, read_buffer, read_size)) { return; } read_size= 0; #else if (!XdmcpFill (xdmcpFd, &buffer, &addr, &addrlen)) { Debug ("XdmcpFill failed\n"); return; } #endif if (!XdmcpReadHeader (&buffer, &header)) { Debug ("XdmcpReadHeader failed\n"); return; } if (header.version != XDM_PROTOCOL_VERSION) { Debug ("XDMCP header version read was %d, expected %d\n", header.version, XDM_PROTOCOL_VERSION); return; } Debug ("header: %d %d %d\n", header.version, header.opcode, header.length); switch (header.opcode) { case BROADCAST_QUERY: broadcast_respond (&addr, addrlen, header.length); break; case QUERY: query_respond (&addr, addrlen, header.length); break; case INDIRECT_QUERY: indirect_respond (&addr, addrlen, header.length); break; case FORWARD_QUERY: forward_respond (&addr, addrlen, header.length); break; case REQUEST: request_respond (&addr, addrlen, header.length); break; case MANAGE: manage (&addr, addrlen, header.length); break; case KEEPALIVE: send_alive (&addr, addrlen, header.length); break; } } WaitForSomething () { FD_TYPE reads; int nready; extern int Rescan, ChildReady; Debug ("WaitForSomething\n"); if (AnyWellKnownSockets () && !ChildReady) { reads = WellKnownSocketsMask; #ifdef MINIX__NOT { struct timeval tv; tv.tv_sec= 5; tv.tv_usec= 0; nready = select (WellKnownSocketsMax + 1, &reads, 0, 0, &tv); ChildReady= 1; } #else nready = select (WellKnownSocketsMax + 1, &reads, 0, 0, 0); #endif Debug ("select returns %d. Rescan: %d ChildReady: %d\n", nready, Rescan, ChildReady); if (nready > 0) { if (xdmcpFd >= 0 && FD_ISSET (xdmcpFd, &reads)) ProcessRequestSocket (); if (chooserFd >= 0 && FD_ISSET (chooserFd, &reads)) ProcessChooserSocket (chooserFd); } if (ChildReady) { WaitForChild (); } } else WaitForChild (); } /* * respond to a request on the UDP socket. */ static ARRAY8 Hostname; void registerHostname (name, namelen) char *name; int namelen; { int i; if (!XdmcpReallocARRAY8 (&Hostname, namelen)) return; for (i = 0; i < namelen; i++) Hostname.data[i] = name[i]; } static void direct_query_respond (from, fromlen, length, type) struct sockaddr *from; int fromlen; int length; xdmOpCode type; { ARRAYofARRAY8 queryAuthenticationNames; int expectedLen; int i; if (!XdmcpReadARRAYofARRAY8 (&buffer, &queryAuthenticationNames)) return; expectedLen = 1; for (i = 0; i < (int)queryAuthenticationNames.length; i++) expectedLen += 2 + queryAuthenticationNames.data[i].length; if (length == expectedLen) all_query_respond (from, fromlen, &queryAuthenticationNames, type); XdmcpDisposeARRAYofARRAY8 (&queryAuthenticationNames); } query_respond (from, fromlen, length) struct sockaddr *from; int fromlen; int length; { Debug ("Query respond %d\n", length); direct_query_respond (from, fromlen, length, QUERY); } broadcast_respond (from, fromlen, length) struct sockaddr *from; int fromlen; int length; { direct_query_respond (from, fromlen, length, BROADCAST_QUERY); } /* computes an X display name */ static char * NetworkAddressToName(connectionType, connectionAddress, displayNumber) CARD16 connectionType; ARRAY8Ptr connectionAddress; CARD16 displayNumber; { switch (connectionType) { case FamilyInternet: { CARD8 *data; struct hostent *hostent; char *name; char *localhost, *localHostname(); data = connectionAddress->data; hostent = gethostbyaddr ((char *)data, connectionAddress->length, AF_INET); localhost = localHostname (); /* * protect against bogus host names */ if (hostent && hostent->h_name && hostent->h_name[0] && (hostent->h_name[0] != '.')) { if (!strcmp (localhost, hostent->h_name)) { if (!getString (name, 10)) return 0; sprintf (name, ":%d", displayNumber); } else { if (removeDomainname) { char *localDot, *remoteDot; /* check for a common domain name. This * could reduce names by recognising common * super-domain names as well, but I don't think * this is as useful, and will confuse more * people */ if ((localDot = strchr(localhost, '.')) && (remoteDot = strchr(hostent->h_name, '.'))) { /* smash the name in place; it won't * be needed later. */ if (!strcmp (localDot+1, remoteDot+1)) *remoteDot = '\0'; } } if (!getString (name, strlen (hostent->h_name) + 10)) return 0; sprintf (name, "%s:%d", hostent->h_name, displayNumber); } } else { if (!getString (name, 25)) return 0; sprintf(name, "%d.%d.%d.%d:%d", data[0], data[1], data[2], data[3], displayNumber); } return name; } #ifdef DNET case FamilyDECnet: return NULL; #endif /* DNET */ default: return NULL; } } /*ARGSUSED*/ forward_respond (from, fromlen, length) struct sockaddr *from; int fromlen; int length; { ARRAY8 clientAddress; ARRAY8 clientPort; ARRAYofARRAY8 authenticationNames; struct sockaddr *client; int clientlen; int expectedLen; int i; Debug ("Forward respond %d\n", length); clientAddress.length = 0; clientAddress.data = 0; clientPort.length = 0; clientPort.data = 0; authenticationNames.length = 0; authenticationNames.data = 0; if (XdmcpReadARRAY8 (&buffer, &clientAddress) && XdmcpReadARRAY8 (&buffer, &clientPort) && XdmcpReadARRAYofARRAY8 (&buffer, &authenticationNames)) { expectedLen = 0; expectedLen += 2 + clientAddress.length; expectedLen += 2 + clientPort.length; expectedLen += 1; /* authenticationNames */ for (i = 0; i < (int)authenticationNames.length; i++) expectedLen += 2 + authenticationNames.data[i].length; if (length == expectedLen) { int j; j = 0; for (i = 0; i < (int)clientPort.length; i++) j = j * 256 + clientPort.data[i]; Debug ("Forward client address (port %d)", j); for (i = 0; i < (int)clientAddress.length; i++) Debug (" %d", clientAddress.data[i]); Debug ("\n"); switch (from->sa_family) { #ifdef AF_INET case AF_INET: { struct sockaddr_in in_addr; if (clientAddress.length != 4 || clientPort.length != 2) { goto badAddress; } bzero ((char *) &in_addr, sizeof (in_addr)); #ifdef BSD44SOCKETS in_addr.sin_len = sizeof(in_addr); #endif in_addr.sin_family = AF_INET; memmove( &in_addr.sin_addr, clientAddress.data, 4); memmove( (char *) &in_addr.sin_port, clientPort.data, 2); client = (struct sockaddr *) &in_addr; clientlen = sizeof (in_addr); } break; #endif #ifdef AF_UNIX case AF_UNIX: { struct sockaddr_un un_addr; if (clientAddress.length >= sizeof (un_addr.sun_path)) goto badAddress; bzero ((char *) &un_addr, sizeof (un_addr)); un_addr.sun_family = AF_UNIX; memmove( un_addr.sun_path, clientAddress.data, clientAddress.length); un_addr.sun_path[clientAddress.length] = '\0'; client = (struct sockaddr *) &un_addr; #ifdef BSD44SOCKETS un_addr.sun_len = strlen(un_addr.sun_path); clientlen = SUN_LEN(&un_addr); #else clientlen = sizeof (un_addr); #endif } break; #endif #ifdef AF_CHAOS case AF_CHAOS: goto badAddress; #endif #ifdef AF_DECnet case AF_DECnet: goto badAddress; #endif } all_query_respond (client, clientlen, &authenticationNames, FORWARD_QUERY); } else { Debug ("Forward length error got %d expect %d\n", length, expectedLen); } } badAddress: XdmcpDisposeARRAY8 (&clientAddress); XdmcpDisposeARRAY8 (&clientPort); XdmcpDisposeARRAYofARRAY8 (&authenticationNames); } send_willing (from, fromlen, authenticationName, status) struct sockaddr *from; int fromlen; ARRAY8Ptr authenticationName; ARRAY8Ptr status; { XdmcpHeader header; Debug ("Send willing %*.*s %*.*s\n", authenticationName->length, authenticationName->length, pS(authenticationName->data), status->length, status->length, pS(status->data)); header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16) WILLING; header.length = 6 + authenticationName->length + Hostname.length + status->length; XdmcpWriteHeader (&buffer, &header); XdmcpWriteARRAY8 (&buffer, authenticationName); XdmcpWriteARRAY8 (&buffer, &Hostname); XdmcpWriteARRAY8 (&buffer, status); XdmcpFlush (xdmcpFd, &buffer, from, fromlen); } send_unwilling (from, fromlen, authenticationName, status) struct sockaddr *from; int fromlen; ARRAY8Ptr authenticationName; ARRAY8Ptr status; { XdmcpHeader header; Debug ("Send unwilling %*.*s %*.*s\n", authenticationName->length, authenticationName->length, pS(authenticationName->data), status->length, status->length, pS(status->data)); header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16) UNWILLING; header.length = 4 + Hostname.length + status->length; XdmcpWriteHeader (&buffer, &header); XdmcpWriteARRAY8 (&buffer, &Hostname); XdmcpWriteARRAY8 (&buffer, status); XdmcpFlush (xdmcpFd, &buffer, from, fromlen); } static unsigned long globalSessionID; #define NextSessionID() (++globalSessionID) void init_session_id() { /* Set randomly so we are unlikely to reuse id's from a previous * incarnation so we don't say "Alive" to those displays. * Start with low digits 0 to make debugging easier. */ globalSessionID = (time((Time_t)0)&0x7fff) * 16000; } static ARRAY8 outOfMemory = { (CARD16) 13, (CARD8Ptr) "Out of memory" }; static ARRAY8 noValidAddr = { (CARD16) 16, (CARD8Ptr) "No valid address" }; static ARRAY8 noValidAuth = { (CARD16) 22, (CARD8Ptr) "No valid authorization" }; static ARRAY8 noAuthentic = { (CARD16) 29, (CARD8Ptr) "XDM has no authentication key" }; request_respond (from, fromlen, length) struct sockaddr *from; int fromlen; int length; { CARD16 displayNumber; ARRAY16 connectionTypes; ARRAYofARRAY8 connectionAddresses; ARRAY8 authenticationName; ARRAY8 authenticationData; ARRAYofARRAY8 authorizationNames; ARRAY8 manufacturerDisplayID; ARRAY8Ptr reason; int expectlen; int i, j; struct protoDisplay *pdpy; ARRAY8 authorizationName, authorizationData; ARRAY8Ptr connectionAddress; Debug ("Request respond %d\n", length); connectionTypes.data = 0; connectionAddresses.data = 0; authenticationName.data = 0; authenticationData.data = 0; authorizationNames.data = 0; authorizationName.length = 0; authorizationData.length = 0; manufacturerDisplayID.data = 0; if (XdmcpReadCARD16 (&buffer, &displayNumber) && XdmcpReadARRAY16 (&buffer, &connectionTypes) && XdmcpReadARRAYofARRAY8 (&buffer, &connectionAddresses) && XdmcpReadARRAY8 (&buffer, &authenticationName) && XdmcpReadARRAY8 (&buffer, &authenticationData) && XdmcpReadARRAYofARRAY8 (&buffer, &authorizationNames) && XdmcpReadARRAY8 (&buffer, &manufacturerDisplayID)) { expectlen = 0; expectlen += 2; /* displayNumber */ expectlen += 1 + 2*connectionTypes.length; /* connectionTypes */ expectlen += 1; /* connectionAddresses */ for (i = 0; i < (int)connectionAddresses.length; i++) expectlen += 2 + connectionAddresses.data[i].length; expectlen += 2 + authenticationName.length; /* authenticationName */ expectlen += 2 + authenticationData.length; /* authenticationData */ expectlen += 1; /* authoriationNames */ for (i = 0; i < (int)authorizationNames.length; i++) expectlen += 2 + authorizationNames.data[i].length; expectlen += 2 + manufacturerDisplayID.length; /* displayID */ if (expectlen != length) { Debug ("Request length error got %d expect %d\n", length, expectlen); goto abort; } if (connectionTypes.length == 0 || connectionAddresses.length != connectionTypes.length) { reason = &noValidAddr; pdpy = 0; goto decline; } pdpy = FindProtoDisplay (from, fromlen, displayNumber); if (!pdpy) { /* Check this Display against the Manager's policy */ reason = Accept (from, fromlen, displayNumber); if (reason) goto decline; /* Check the Display's stream services against Manager's policy */ i = SelectConnectionTypeIndex (&connectionTypes, &connectionAddresses); if (i < 0) { reason = &noValidAddr; goto decline; } /* The Manager considers this a new session */ connectionAddress = &connectionAddresses.data[i]; pdpy = NewProtoDisplay (from, fromlen, displayNumber, connectionTypes.data[i], connectionAddress, NextSessionID()); Debug ("NewProtoDisplay 0x%x\n", pdpy); if (!pdpy) { reason = &outOfMemory; goto decline; } } if (authorizationNames.length == 0) j = 0; else j = SelectAuthorizationTypeIndex (&authenticationName, &authorizationNames); if (j < 0) { reason = &noValidAuth; goto decline; } if (!CheckAuthentication (pdpy, &manufacturerDisplayID, &authenticationName, &authenticationData)) { reason = &noAuthentic; goto decline; } if (j < (int)authorizationNames.length) { Xauth *auth; SetProtoDisplayAuthorization (pdpy, (unsigned short) authorizationNames.data[j].length, (char *) authorizationNames.data[j].data); auth = pdpy->xdmcpAuthorization; if (!auth) auth = pdpy->fileAuthorization; if (auth) { authorizationName.length = auth->name_length; authorizationName.data = (CARD8Ptr) auth->name; authorizationData.length = auth->data_length; authorizationData.data = (CARD8Ptr) auth->data; } } if (pdpy) { send_accept (from, fromlen, pdpy->sessionID, &authenticationName, &authenticationData, &authorizationName, &authorizationData); } else { decline: ; send_decline (from, fromlen, &authenticationName, &authenticationData, reason); if (pdpy) DisposeProtoDisplay (pdpy); } } abort: XdmcpDisposeARRAY16 (&connectionTypes); XdmcpDisposeARRAYofARRAY8 (&connectionAddresses); XdmcpDisposeARRAY8 (&authenticationName); XdmcpDisposeARRAY8 (&authenticationData); XdmcpDisposeARRAYofARRAY8 (&authorizationNames); XdmcpDisposeARRAY8 (&manufacturerDisplayID); } send_accept (to, tolen, sessionID, authenticationName, authenticationData, authorizationName, authorizationData) struct sockaddr *to; int tolen; CARD32 sessionID; ARRAY8Ptr authenticationName, authenticationData; ARRAY8Ptr authorizationName, authorizationData; { XdmcpHeader header; Debug ("Accept Session ID %d\n", sessionID); header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16) ACCEPT; header.length = 4; /* session ID */ header.length += 2 + authenticationName->length; header.length += 2 + authenticationData->length; header.length += 2 + authorizationName->length; header.length += 2 + authorizationData->length; XdmcpWriteHeader (&buffer, &header); XdmcpWriteCARD32 (&buffer, sessionID); XdmcpWriteARRAY8 (&buffer, authenticationName); XdmcpWriteARRAY8 (&buffer, authenticationData); XdmcpWriteARRAY8 (&buffer, authorizationName); XdmcpWriteARRAY8 (&buffer, authorizationData); XdmcpFlush (xdmcpFd, &buffer, to, tolen); } send_decline (to, tolen, authenticationName, authenticationData, status) struct sockaddr *to; int tolen; ARRAY8Ptr authenticationName, authenticationData; ARRAY8Ptr status; { XdmcpHeader header; Debug ("Decline %*.*s\n", status->length, status->length, pS(status->data)); header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16) DECLINE; header.length = 0; header.length += 2 + status->length; header.length += 2 + authenticationName->length; header.length += 2 + authenticationData->length; XdmcpWriteHeader (&buffer, &header); XdmcpWriteARRAY8 (&buffer, status); XdmcpWriteARRAY8 (&buffer, authenticationName); XdmcpWriteARRAY8 (&buffer, authenticationData); XdmcpFlush (xdmcpFd, &buffer, to, tolen); } manage (from, fromlen, length) struct sockaddr *from; int fromlen; int length; { CARD32 sessionID; CARD16 displayNumber; ARRAY8 displayClass; int expectlen; struct protoDisplay *pdpy; struct display *d; char *name; char *class; 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 (from, fromlen, displayNumber); Debug ("Manage Session ID %d, pdpy 0x%x\n", 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(from, fromlen, displayNumber)) && d->sessionID == sessionID) { Debug("manage: got duplicate pkt, ignoring\n"); goto abort; } Debug ("Session ID %d refused\n", sessionID); if (pdpy) Debug ("Existing Session ID %d\n", pdpy->sessionID); send_refuse (from, fromlen, sessionID); } else { name = NetworkAddressToName (pdpy->connectionType, &pdpy->connectionAddress, pdpy->displayNumber); Debug ("Computed display name: %s\n", name); if (!name) { send_failed (from, fromlen, "(no name)", sessionID, "out of memory"); goto abort; } d = FindDisplayByName (name); if (d) { extern void StopDisplay (); Debug ("Terminating active session for %s\n", d->name); StopDisplay (d); } class = malloc (displayClass.length + 1); if (!class) { send_failed (from, fromlen, name, sessionID, "out of memory"); goto abort; } if (displayClass.length) { memmove( class, displayClass.data, displayClass.length); class[displayClass.length] = '\0'; } else class = (char *) 0; from_save = (XdmcpNetaddr) malloc (fromlen); if (!from_save) { send_failed (from, fromlen, name, sessionID, "out of memory"); goto abort; } memmove( from_save, from, fromlen); d = NewDisplay (name, class); if (!d) { free ((char *) from_save); send_failed (from, fromlen, name, sessionID, "out of memory"); goto abort; } d->displayType.location = Foreign; d->displayType.lifetime = Transient; d->displayType.origin = FromXDMCP; d->sessionID = pdpy->sessionID; d->from = from_save; d->fromlen = fromlen; d->displayNumber = pdpy->displayNumber; ClientAddress (from, &clientAddress, &clientPort, &connectionType); d->useChooser = 0; 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; 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"); goto abort; } d->authorizations[0] = pdpy->fileAuthorization; d->authNum = 1; pdpy->fileAuthorization = 0; } DisposeProtoDisplay (pdpy); Debug ("Starting display %s,%s\n", d->name, d->class); StartDisplay (d); } } abort: XdmcpDisposeARRAY8 (&displayClass); } SendFailed (d, reason) struct display *d; char *reason; { Debug ("Display start failed, sending Failed\n"); send_failed (d->from, d->fromlen, d->name, d->sessionID, reason); } send_failed (from, fromlen, name, sessionID, reason) struct sockaddr *from; int fromlen; char *name; CARD32 sessionID; char *reason; { static char buf[256]; XdmcpHeader header; ARRAY8 status; sprintf (buf, "Session %d failed for display %s: %s", sessionID, name, reason); Debug ("Send failed %d %s\n", sessionID, buf); status.length = strlen (buf); status.data = (CARD8Ptr) buf; header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16) FAILED; header.length = 6 + status.length; XdmcpWriteHeader (&buffer, &header); XdmcpWriteCARD32 (&buffer, sessionID); XdmcpWriteARRAY8 (&buffer, &status); XdmcpFlush (xdmcpFd, &buffer, from, fromlen); } send_refuse (from, fromlen, sessionID) struct sockaddr *from; int fromlen; CARD32 sessionID; { XdmcpHeader header; Debug ("Send refuse %d\n", sessionID); header.version = XDM_PROTOCOL_VERSION; header.opcode = (CARD16) REFUSE; header.length = 4; XdmcpWriteHeader (&buffer, &header); XdmcpWriteCARD32 (&buffer, sessionID); XdmcpFlush (xdmcpFd, &buffer, from, fromlen); } send_alive (from, fromlen, length) struct sockaddr *from; int fromlen; int length; { 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) { d = FindDisplayBySessionID (sessionID); if (!d) { d = FindDisplayByAddress (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 %d\n", sendRunning, sendSessionID); XdmcpWriteHeader (&buffer, &header); XdmcpWriteCARD8 (&buffer, sendRunning); XdmcpWriteCARD32 (&buffer, sendSessionID); XdmcpFlush (xdmcpFd, &buffer, from, fromlen); } } } char * NetworkAddressToHostname (connectionType, connectionAddress) CARD16 connectionType; ARRAY8Ptr connectionAddress; { char *name = 0; switch (connectionType) { case FamilyInternet: { struct hostent *hostent; char dotted[20]; char *local_name; hostent = gethostbyaddr ((char *)connectionAddress->data, connectionAddress->length, AF_INET); if (hostent) local_name = hostent->h_name; else { /* can't get name, so use emergency fallback */ sprintf(dotted, "%d.%d.%d.%d", connectionAddress->data[0], connectionAddress->data[1], connectionAddress->data[2], connectionAddress->data[3]); local_name = dotted; LogError ("Cannot convert Internet address %s to host name\n", dotted); } if (!getString (name, strlen (local_name))) break; strcpy (name, local_name); break; } #ifdef DNET case FamilyDECnet: break; #endif /* DNET */ default: break; } return name; } static HostnameToNetworkAddress (name, connectionType, connectionAddress) char *name; CARD16 connectionType; ARRAY8Ptr connectionAddress; { switch (connectionType) { case FamilyInternet: { struct hostent *hostent; hostent = gethostbyname (name); if (!hostent) return FALSE; if (!XdmcpAllocARRAY8 (connectionAddress, hostent->h_length)) return FALSE; memmove( connectionAddress->data, hostent->h_addr, hostent->h_length); return TRUE; } #ifdef DNET case FamilyDECnet: return FALSE; #endif } return FALSE; } /* * converts a display name into a network address, using * the same rules as XOpenDisplay (algorithm cribbed from there) */ static NameToNetworkAddress(name, connectionTypep, connectionAddress, displayNumber) char *name; CARD16Ptr connectionTypep; ARRAY8Ptr connectionAddress; CARD16Ptr displayNumber; { char *colon, *display_number; char hostname[1024]; int dnet = FALSE; CARD16 number; CARD16 connectionType; colon = strchr(name, ':'); if (!colon) return FALSE; if (colon != name) { if (colon - name > sizeof (hostname)) return FALSE; strncpy (hostname, name, colon - name); hostname[colon - name] = '\0'; } else { strcpy (hostname, localHostname ()); } if (colon[1] == ':') { dnet = TRUE; colon++; } #ifndef DNETCONN if (dnet) return FALSE; #endif display_number = colon + 1; while (*display_number && *display_number != '.') { if (!isascii (*display_number) || !isdigit(*display_number)) return FALSE; } if (display_number == colon + 1) return FALSE; number = atoi (colon + 1); #ifdef DNETCONN if (dnet) connectionType = FamilyDECnet; else #endif connectionType = FamilyInternet; if (!HostnameToNetworkAddress (hostname, connectionType, connectionAddress)) return FALSE; *displayNumber = number; *connectionTypep = connectionType; return TRUE; } #endif /* XDMCP */ #ifdef MINIX void udp_read_cb(nbio_ref_t ref, int res, int err) { if (!read_inprogress) abort(); if (res > 0) { read_size= res; } else { LogError("read error: %s\n", res == 0 ? "EOF" : strerror(err)); read_size= 0; } read_inprogress= 0; } #endif