Communications Between Program and Controlling Program
Hi All, I'm looking for feedback on the best way to code communications between Programs. The architecture we are looking at is similar to Symantec AV or others - a control program sends messages to the worker program on a different machine. The worker program communicates back when complete (with a result), and gets another chunk of work. The messages will be small. What will be communicated is as follows: Control Program: Control Program Start Control Program Stop (Worker queues messages) Control Program sends a piece of work when requested Worker Program: Worker Program Start Worker Program Stop Worker Program Completed Job Both the Control and Worker will be System Services on Win 2k & 2k3 Server, or 2000 & XP Workstations. Any feedback would be appreciated, Jeff
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Hi All, I should have speciifed the kind of feedback: Named Pipes \ Mailslot versus a socket, etc. Jeff
Named pipes if you are working within a single Windows domain (or domains with mutual trust arrangements) and want security. Sockets if you need to work across multiple domains. At that point, concepts like SSL and other encryption layers have to be dealt with or any 12-year-old (of any age) with a network connection can attack you. Mailslots are not "reliable" communications mechanisms. Also, no matter what your protocol is, make sure that you can handle multiple startup messages, multiple shutdown messages, etc. (I built such a pair of programs, and debugging them was a nightmare until I built a robust protocol so that either could be shut down and restarted and the protocol would resynchronize) joe On 30 May 2006 13:55:35 -0700, "Jeff" <noloader@gmail.com> wrote: >Hi All, > >I should have speciifed the kind of feedback: > >Named Pipes \ Mailslot versus a socket, etc. > >Jeff Joseph M. Newcomer [MVP] email: newcomer@flounder.com Web: http://www.flounder.com MVP Tips: http://www.flounder.com/mvp_tips.htm
newcomer"Joseph M. Newcomer" <newcomer@flounder.com> wrote in message news:701s72teu0jfauq49a5gqpv18fsmn8shgc@4ax.com... > Named pipes if you are working within a single Windows domain (or domains > with mutual > trust arrangements) and want security. > > Sockets if you need to work across multiple domains. At that point, > concepts like SSL and > other encryption layers have to be dealt with or any 12-year-old (of any > age) with a > network connection can attack you. (snip) I'm curious about this previous statement. I work with an application that uses sockets, but we don't currently support SSL. The application is designed to run on an intranet (meaning, no external access to the PC running our socket-app). Is this a known security risk? Most clients have a router between their internal network and the internet, and they are using non-routable-IP's (192.168.*.*). Thanks in advance for any advice. DanB
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Dan
5/31/2006 9:57:48 PM
The 12-year-olds do not necessarily exist outside the intranet. It depends on what you are trying to protect. I have some wonderful internal attacks that can be done by unhappy employees, which I describe in my security course. It depends on whether or not you trust the folks on the network. The 192.168.* addresses are not forwarded by routers, but in large corporations, the ability to slip into the corporate network and work from within, even for outsiders, means that you need a lot more trust than major corporations are willing to grant. SSL at least gives you protection from packet sniffers and unhappy internal people. joe On Wed, 31 May 2006 15:57:48 -0600, "Dan Baker" <dbmail> wrote: >"Joseph M. Newcomer" <newcomer@flounder.com> wrote in message >news:701s72teu0jfauq49a5gqpv18fsmn8shgc@4ax.com... >> Named pipes if you are working within a single Windows domain (or domains >> with mutual >> trust arrangements) and want security. >> >> Sockets if you need to work across multiple domains. At that point, >> concepts like SSL and >> other encryption layers have to be dealt with or any 12-year-old (of any >> age) with a >> network connection can attack you. >(snip) > >I'm curious about this previous statement. I work with an application that >uses sockets, but we don't currently support SSL. The application is >designed to run on an intranet (meaning, no external access to the PC >running our socket-app). Is this a known security risk? Most clients have >a router between their internal network and the internet, and they are using >non-routable-IP's (192.168.*.*). > >Thanks in advance for any advice. >DanB > Joseph M. Newcomer [MVP] email: newcomer@flounder.com Web: http://www.flounder.com MVP Tips: http://www.flounder.com/mvp_tips.htm
"Joseph M. Newcomer" <newcomer@flounder.com> wrote in message news:7vls72lgsftkn3ndkgcrh7fqukma9rvbnf@4ax.com... > The 12-year-olds do not necessarily exist outside the intranet. It > depends on what you > are trying to protect. I have some wonderful internal attacks that can be > done by unhappy > employees, which I describe in my security course. > > It depends on whether or not you trust the folks on the network. The > 192.168.* addresses > are not forwarded by routers, but in large corporations, the ability to > slip into the > corporate network and work from within, even for outsiders, means that you > need a lot more > trust than major corporations are willing to grant. SSL at least gives > you protection > from packet sniffers and unhappy internal people. > joe Excellent response. All good news. Thanks DanB
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Dan
6/1/2006 5:18:50 PM
Hi Joe, Thanks for the response. > Named pipes if you are working within a single Windows domain (or domains with mutual > trust arrangements) and want security. It is a Windows 2003 domain. I was also thinking about an AD partition. That is, the controlling program places information in the partition, and the worker grabs it up and does work. If two workers perform the same work - it is OK (great burden lifted :). Do you have any experience with the 2003 partitions? I was intorduced to it in a Architecture class taught by Microsoft, but not from a programmic standpoint. Jeff Joseph M. Newcomer wrote: > Named pipes if you are working within a single Windows domain (or domains with mutual > trust arrangements) and want security. > > Sockets if you need to work across multiple domains. At that point, concepts like SSL and > other encryption layers have to be dealt with or any 12-year-old (of any age) with a > network connection can attack you. > > Mailslots are not "reliable" communications mechanisms. > > ... > joe > ... > Joseph M. Newcomer [MVP] > email: newcomer@flounder.com > Web: http://www.flounder.com > MVP Tips: http://www.flounder.com/mvp_tips.htm
In case anyone was wondering about the data partitions, here's a link: http://www.microsoft.com/windowsserver2003/techinfo/overview/adam.mspx Jeff wrote: > Hi Joe, > > Thanks for the response. > > > Named pipes if you are working within a single Windows domain (or domains with mutual > > trust arrangements) and want security. > It is a Windows 2003 domain. > > I was also thinking about an AD partition. That is, the controlling > program places information in the partition, and the worker grabs it up > and does work. If two workers perform the same work - it is OK (great > burden lifted :). > > Do you have any experience with the 2003 partitions? I was intorduced > to it in a Architecture class taught by Microsoft, but not from a > programmic standpoint. > > Jeff > > Joseph M. Newcomer wrote: > > Named pipes if you are working within a single Windows domain (or domains with mutual > > trust arrangements) and want security. > > > > Sockets if you need to work across multiple domains. At that point, concepts like SSL and > > other encryption layers have to be dealt with or any 12-year-old (of any age) with a > > network connection can attack you. > > > > Mailslots are not "reliable" communications mechanisms. > > > > ... > > joe > > ... > > Joseph M. Newcomer [MVP] > > email: newcomer@flounder.com > > Web: http://www.flounder.com > > MVP Tips: http://www.flounder.com/mvp_tips.htm
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This is by no means a bash against MS Publisher. I am working with a client that is assembling hundreds of reports utilizing MS Publisher. These are intricate financial reports with tables, graphs, charts etc. that are many pages long, so it is by nature a very intense procedure. The information comes mainly from Excel workbooks by way of copy and paste. This has been an OK procedure but the fact remains that to insert a page...redo page numbers and deal with the idiocincracies of ever changing information have made this a nightmarish duty to say the least. Would someone at least give me...
Firewire communication
Hi guys, I am trying to interact with a camera through firewire. I wrote a code based on the example given in MSDN. When I execute the code it always return the value 1 no matter whether the device is connected or disconnected. Please let me know what went wrong, i couldnt figure out the problem so for. My code is as follows. -------------------------------------- void CFireDlg::OnDeviceNotify() { // TODO: Add your control notification handler code here CString cs; bool bDevInterResult=FALSE; HDEVNOTIFY *hdn=NULL; bDevInterResult = DoRegisterDeviceInterface(GUID_MP1394MI,...
Passing a Control Value from a Form to a Query
I use Access 2000. I have a form that has a command button to Create an Invoice. When this button is clicked a Dialog Pop-up form appears. The user is required to enter 2 pieces of data in this form. On this form there is a command button to Preview the invoice. I have no problem of passing the 2 pieces of user data from the Dialog Pop-up to the underlying query. What I do not know how to do is pass the initial form's CustomerID control value to the query and/or the code for the Preview command button. I know this should be pretty simple to accomplish but I am bew...
startup programs
hello, I'm trying to check & modify the progs that run at startup. I go to control panel / change startup programs. I get a message that windows defender is turned off, and I can get no further unless I turn it back on. Defender is off because I have Norton. I don't particularly want to have to to turn it on. Advice please ? Thanks KK KRK wrote: > I'm trying to check & modify the progs that run at startup. I go to > control panel / change startup programs. I get a message that > windows defender is turned off, and I can get no further u...
Dialog Box controls/CListBox
I am having trouble accessing the contents of a list box after I close the dialog box. I want to find out what items are left in the box.. Am I not allowed to access the list box outside of the dialog box? If the dialogbox is destroyed, all its child controls are also destroyed. You should get the data out of the controls in OnOk or similar function. -- Ajay Kalra [MVP - VC++] ajaykalra@yahoo.com "William Gower" <w_gower@hotmail.com> wrote in message news:uNdgmw3lDHA.1488@TK2MSFTNGP12.phx.gbl... | I am having trouble accessing the contents of a list box after I close t...
communication
My client needs to communicate between two computers. Is there anyway they can share calendars without a server. I think I know the answer and its nuts. The work arounds I have tried do not work efficiently. Can someone steer me in the right direction? I need to share calendars and winfax pro files ? Thanks Take a look here, it may help: http://www.slipstick.com/outlook/share.htm --� Milly Staples [MVP - Outlook] Post all replies to the group to keep the discussion intact. Due to the (insert latest virus name here) virus, all mail sent to my personal account will be deleted without r...
Excel communicating to csharp application
In Excel I need some information that the csharp application holds. What would be the best aproach for this problem. Any help is really appreciated. THANKS ...