/* $Xorg: connect.c,v 1.4 2001/02/09 02:03:26 xorgcvs Exp $ */ /****************************************************************************** Copyright 1993, 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. Author: Ralph Mor, X Consortium ******************************************************************************/ /* $XFree86: xc/lib/ICE/connect.c,v 3.9 2001/12/14 19:53:35 dawes Exp $ */ #ifdef HAVE_CONFIG_H #include #endif #include #include "ICElibint.h" #include #include "globals.h" static XtransConnInfo ConnectToPeer(char *networkIdsList, char **actualConnectionRet); #define Strstr strstr IceConn IceOpenConnection (networkIdsList, context, mustAuthenticate, majorOpcodeCheck, errorLength, errorStringRet) char *networkIdsList; IcePointer context; Bool mustAuthenticate; int majorOpcodeCheck; int errorLength; char *errorStringRet; { IceConn iceConn; int extra, i, j; int endian; Bool gotReply, ioErrorOccured; unsigned long setup_sequence; iceByteOrderMsg *pByteOrderMsg; iceConnectionSetupMsg *pSetupMsg; char *pData; IceReplyWaitInfo replyWait; _IceReply reply; int authUsableCount; int authUsableFlags[MAX_ICE_AUTH_NAMES]; int authIndices[MAX_ICE_AUTH_NAMES]; if (errorStringRet && errorLength > 0) *errorStringRet = '\0'; if (networkIdsList == NULL || *networkIdsList == '\0') { strncpy (errorStringRet, "networkIdsList argument is NULL", errorLength); return (NULL); } /* * Check to see if we can use a previously created ICE connection. * * If iceConn->want_to_close is True, or iceConn->free_asap is True, * we can not use the iceConn. * * If 'context' is non-NULL, we will only use a previously opened ICE * connection if the specified 'context' is equal to the context * associated with the ICE connection, or if the context associated * with the ICE connection is NULL. * * If 'majorOpcodeCheck' is non-zero, it will contain a protocol major * opcode that we should make sure is not already active on the ICE * connection. Some clients will want two seperate connections for the * same protocol to the same destination client. */ for (i = 0; i < _IceConnectionCount; i++) { char *strptr; if ((strptr = (char *) Strstr ( networkIdsList, _IceConnectionStrings[i])) != NULL) { char ch = *(strptr + strlen (_IceConnectionStrings[i])); if (ch == ',' || ch == '\0') { /* * OK, we found a connection. Make sure we can reuse it. */ IceConn iceConn = _IceConnectionObjs[i]; if (iceConn->want_to_close || iceConn->free_asap || (context && iceConn->context && iceConn->context != context)) { /* force a new connection to be created */ break; } if (majorOpcodeCheck) { for (j = iceConn->his_min_opcode; j <= iceConn->his_max_opcode; j++) { if (iceConn->process_msg_info[ j - iceConn->his_min_opcode].in_use && iceConn->process_msg_info[ j - iceConn->his_min_opcode].my_opcode == majorOpcodeCheck) break; } if (j <= iceConn->his_max_opcode || (iceConn->protosetup_to_you && iceConn->protosetup_to_you->my_opcode == majorOpcodeCheck)) { /* force a new connection to be created */ break; } } iceConn->open_ref_count++; if (context && !iceConn->context) iceConn->context = context; return (iceConn); } } } if ((iceConn = (IceConn) malloc (sizeof (struct _IceConn))) == NULL) { strncpy (errorStringRet, "Can't malloc", errorLength); return (NULL); } /* * Open a network connection with the peer client. */ if ((iceConn->trans_conn = ConnectToPeer (networkIdsList, &iceConn->connection_string)) == NULL) { free ((char *) iceConn); strncpy (errorStringRet, "Could not open network socket", errorLength); return (NULL); } /* * Set close-on-exec so that programs that fork() don't get confused. */ _IceTransSetOption (iceConn->trans_conn, TRANS_CLOSEONEXEC, 1); iceConn->listen_obj = NULL; iceConn->connection_status = IceConnectPending; iceConn->io_ok = True; iceConn->dispatch_level = 0; iceConn->context = context; iceConn->my_ice_version_index = 0; iceConn->send_sequence = 0; iceConn->receive_sequence = 0; iceConn->vendor = NULL; iceConn->release = NULL; iceConn->outbuf = NULL; iceConn->scratch = NULL; iceConn->scratch_size = 0; iceConn->process_msg_info = NULL; iceConn->connect_to_you = NULL; iceConn->protosetup_to_you = NULL; iceConn->connect_to_me = NULL; iceConn->protosetup_to_me = NULL; if ((iceConn->inbuf = iceConn->inbufptr = (char *) malloc (ICE_INBUFSIZE)) == NULL) { _IceFreeConnection (iceConn); strncpy (errorStringRet, "Can't malloc", errorLength); return (NULL); } iceConn->inbufmax = iceConn->inbuf + ICE_INBUFSIZE; if ((iceConn->outbuf = iceConn->outbufptr = (char *) calloc (1, ICE_OUTBUFSIZE)) == NULL) { _IceFreeConnection (iceConn); strncpy (errorStringRet, "Can't malloc", errorLength); return (NULL); } iceConn->outbufmax = iceConn->outbuf + ICE_OUTBUFSIZE; iceConn->open_ref_count = 1; iceConn->proto_ref_count = 0; iceConn->skip_want_to_close = False; iceConn->want_to_close = False; iceConn->free_asap = False; iceConn->saved_reply_waits = NULL; iceConn->ping_waits = NULL; iceConn->connect_to_you = (_IceConnectToYouInfo *) malloc ( sizeof (_IceConnectToYouInfo)); iceConn->connect_to_you->auth_active = 0; /* * Send our byte order. */ IceGetHeader (iceConn, 0, ICE_ByteOrder, SIZEOF (iceByteOrderMsg), iceByteOrderMsg, pByteOrderMsg); endian = 1; if (*(char *) &endian) pByteOrderMsg->byteOrder = IceLSBfirst; else pByteOrderMsg->byteOrder = IceMSBfirst; IceFlush (iceConn); /* * Now read the ByteOrder message from the other client. * iceConn->swap should be set to the appropriate boolean * value after the call to IceProcessMessages. */ iceConn->waiting_for_byteorder = True; ioErrorOccured = False; while (iceConn->waiting_for_byteorder == True && !ioErrorOccured) { ioErrorOccured = (IceProcessMessages ( iceConn, NULL, NULL) == IceProcessMessagesIOError); } if (ioErrorOccured) { _IceFreeConnection (iceConn); strncpy (errorStringRet, "IO error occured opening connection", errorLength); return (NULL); } if (iceConn->connection_status == IceConnectRejected) { /* * We failed to get the required ByteOrder message. */ _IceFreeConnection (iceConn); strncpy (errorStringRet, "Internal error - did not receive the expected ByteOrder message", errorLength); return (NULL); } /* * Determine which authentication methods are available for * the Connection Setup authentication. */ _IceGetPoValidAuthIndices ( "ICE", iceConn->connection_string, _IceAuthCount, _IceAuthNames, &authUsableCount, authIndices); for (i = 0; i < _IceAuthCount; i++) { authUsableFlags[i] = 0; for (j = 0; j < authUsableCount && !authUsableFlags[i]; j++) authUsableFlags[i] = (authIndices[j] == i); } /* * Now send a Connection Setup message. */ extra = STRING_BYTES (IceVendorString) + STRING_BYTES (IceReleaseString); for (i = 0; i < _IceAuthCount; i++) if (authUsableFlags[i]) { extra += STRING_BYTES (_IceAuthNames[i]); } extra += (_IceVersionCount * 4); IceGetHeaderExtra (iceConn, 0, ICE_ConnectionSetup, SIZEOF (iceConnectionSetupMsg), WORD64COUNT (extra), iceConnectionSetupMsg, pSetupMsg, pData); setup_sequence = iceConn->send_sequence; pSetupMsg->versionCount = _IceVersionCount; pSetupMsg->authCount = authUsableCount; pSetupMsg->mustAuthenticate = mustAuthenticate; STORE_STRING (pData, IceVendorString); STORE_STRING (pData, IceReleaseString); for (i = 0; i < _IceAuthCount; i++) if (authUsableFlags[i]) { STORE_STRING (pData, _IceAuthNames[i]); } for (i = 0; i < _IceVersionCount; i++) { STORE_CARD16 (pData, _IceVersions[i].major_version); STORE_CARD16 (pData, _IceVersions[i].minor_version); } IceFlush (iceConn); /* * Process messages until we get a Connection Reply or an Error Message. * Authentication will take place behind the scenes. */ replyWait.sequence_of_request = setup_sequence; replyWait.major_opcode_of_request = 0; replyWait.minor_opcode_of_request = ICE_ConnectionSetup; replyWait.reply = (IcePointer) &reply; gotReply = False; ioErrorOccured = False; while (!gotReply && !ioErrorOccured) { ioErrorOccured = (IceProcessMessages ( iceConn, &replyWait, &gotReply) == IceProcessMessagesIOError); if (ioErrorOccured) { strncpy (errorStringRet, "IO error occured opening connection", errorLength); _IceFreeConnection (iceConn); iceConn = NULL; } else if (gotReply) { if (reply.type == ICE_CONNECTION_REPLY) { if (reply.connection_reply.version_index >= _IceVersionCount) { strncpy (errorStringRet, "Got a bad version index in the Connection Reply", errorLength); free (reply.connection_reply.vendor); free (reply.connection_reply.release); _IceFreeConnection (iceConn); iceConn = NULL; } else { iceConn->my_ice_version_index = reply.connection_reply.version_index; iceConn->vendor = reply.connection_reply.vendor; iceConn->release = reply.connection_reply.release; _IceConnectionObjs[_IceConnectionCount] = iceConn; _IceConnectionStrings[_IceConnectionCount] = iceConn->connection_string; _IceConnectionCount++; free ((char *) iceConn->connect_to_you); iceConn->connect_to_you = NULL; iceConn->connection_status = IceConnectAccepted; } } else /* reply.type == ICE_CONNECTION_ERROR */ { /* Connection failed */ strncpy (errorStringRet, reply.connection_error.error_message, errorLength); free (reply.connection_error.error_message); _IceFreeConnection (iceConn); iceConn = NULL; } } } if (iceConn && _IceWatchProcs) { /* * Notify the watch procedures that an iceConn was opened. */ _IceConnectionOpened (iceConn); } return (iceConn); } IcePointer IceGetConnectionContext (iceConn) IceConn iceConn; { return (iceConn->context); } /* ------------------------------------------------------------------------- * * local routines * * ------------------------------------------------------------------------- */ #define ICE_CONNECTION_RETRIES 5 static XtransConnInfo ConnectToPeer (char *networkIdsList, char **actualConnectionRet) { char addrbuf[256]; char* address; char *ptr, *endptr, *delim; int madeConnection = 0; int len, retry; int connect_stat; int address_size; XtransConnInfo trans_conn = NULL; *actualConnectionRet = NULL; ptr = networkIdsList; len = strlen (networkIdsList); endptr = networkIdsList + len; if (len < sizeof addrbuf) { address = addrbuf; address_size = 256; } else { address = malloc (len + 1); address_size = len; } while (ptr < endptr && !madeConnection) { if ((delim = (char *) strchr (ptr, ',')) == NULL) delim = endptr; len = delim - ptr; if (len > address_size - 1) len = address_size - 1; strncpy (address, ptr, len); address[len] = '\0'; ptr = delim + 1; for (retry = ICE_CONNECTION_RETRIES; retry >= 0; retry--) { if ((trans_conn = _IceTransOpenCOTSClient (address)) == NULL) { break; } if ((connect_stat = _IceTransConnect (trans_conn, address)) < 0) { _IceTransClose (trans_conn); if (connect_stat == TRANS_TRY_CONNECT_AGAIN) { sleep(1); continue; } else break; } else { madeConnection = 1; break; } } } if (madeConnection) { /* * We need to return the actual network connection string */ *actualConnectionRet = strdup(address); /* * Return the file descriptor */ } else trans_conn = NULL; if (address != addrbuf) free (address); return trans_conn; }