How can I create folders on a remote Windows PC using C++?
Directly, you can't -- there would have to be a service on the remote machine which exposes that functionality for you.
If you're talking about a server message block scenario (i.e. "Windows Filesharing"), you can just call CreateDirectory with a network path, i.e. "\\\\computername\\share\\newFolder", but this requires the remote machine already be setup with an existing network share (I don't believe you can create said share remotely without A. admin rights on the target box, and B. some lessening of security settings to allow creation of shares remotely).
EDIT: (In response to the tag edit adding the MFC tag)
As far as how CreateDirectory is exposed in MFC, I'm not sure if there's an MFC wrapper around that function at all -- though there really doesn't need to be a wrapper because the function itself is self contained -- there'd be no benefit of putting it in a class.
The typical way is to start by calling NetShareAdd to create a share to a path on the remote machine. To support creating things there, you'll normally want to specify at least ACCESS_CREATE for the share.
Once you've done that, you'll have a local path to the remote disk, and you can create a directory in it, just like you would with a local disk.
Related
I have a C++ program which I want to use on my clients machines. However, some of my clients are behind proxies. Therefore, I want my program to automatically detect these proxies.
I have tried many solutions, such as reading the registry for the proxy settings, trying the Windows API's, etc.
However none of them have worked out well. E.g. the registry sometimes holds the url for the PAC-file and sometimes the actual proxy-address itself. Besides that, I haven't been able to find any username and password related to the proxy if it is set on the client machine (which some users say they have).
So, basically my question is:
How can I automatically determine the proxy settings of my clients in C++ so I can use the proxy-settings in my LibCurl requests later on regarding:
Proxy-address
Proxy-port
Proxy-User
Proxy-Password
I can't get it to work and I have been trying it for two weeks now without any improvement...
You can not read proxy setting in a generic way, since every application is free to store it in any way it wants. You should be able to read Internet Explorer proxy by using WinHttpGetIEProxyConfigForCurrentUser function, and it would also work for users browsers which use this setting, like Google Chrome.
How can I automatically determine the proxy settings of my clients in C++ so I can use the proxy-settings in my LibCurl requests?
libproxy is the answer!
Libproxy home page on GitHub
Libproxy repo on GitHub
It has these features according to the home page:
support for all major platforms: Windows, Mac and Linux/UNIX (see upcoming 0.4 release)
extremely small core footprint
no external dependencies within libproxy core (libproxy plugins may have dependencies)
only 3 functions in the stable-ish external API (1.0 will offer full stability)
dynamic adjustment to changing network topology
a standard way of dealing with proxy settings across all scenarios
a sublime sense of joy and accomplishment
How can I hibernate a Windows machine that runs Windows 7 or 8 over my LAN from another PC?
Is there a WinAPI function for that? Or do I have to send special magic packets or something like this?
All I know is that PsShutdown.exe is able to do it (allegedly. I haven't tried it).
I don't want to use third party libraries and I also don't want to run a service on the computer that is supposed to get hibernated. I want to use the existing mechanism.
I'd also like to know if I need to change specific settings on the target computer.
I'm not sure if that's important, but shutdown /s /m \\ComputerName did not work on my target PC.
The TechNet document Restart or Shut Down a Remote Computer and Document the Reason describes the requirements to use the shutdown.exe command against a remote computer.
In order to use this feature, the Remote Registry service must be enabled on the remote computer.
Access to the Remote Registry or membership in the Administrators group on the remote computer is the minimum required to complete this procedure
To the best of my knowledge, the only way to remotely hibernate a machine is to use the same method that psshutdown does: copy an executable to the remote machine and install it as a system service.
The OpenSCManager API allows you to specify a target computer, and you can use the handle it returns to call CreateService and then StartService. The service can delete itself once it has done its work.
My problem is simple, I have 1 computer conected to many powerfull servers. I want to execute the app locally but run the process (heavy load) in the remote servers.
The app+settings vary a lot, and I want that this exactly version of the app+settings folder to be used by the remote instances.
My approach so far:
Launch the app locally
Use PSEXEC to remote launch the same executable as it is running in local -> in the servers (with a random port number passed by argument)
Contect to them via sockets
Send commands to execute remotely and get the results
My problem relies in the config files, wich are many(50+) and some of them +4MB. This config files are TXT files in a config folder.
What is the proper way to do it? Is it possible to use PSEXEC to copy remotely a whole folder? Can I do any good trick on the sockets to directly pass a copy of the local files to remote?
I would like all the process to be semi-transparent. Since many people will use it with different versions and settings at the same time. So manually copying the files to 20+servers is NOT an option.
Thank you!
Put the program/script that you want to execute by all machines on one common location on local network (put your configs there too). On all servers create a batch file say 'runme.bat' that will execute your program directly from network location.
This way you can use psexec to run runme.bat essentially executing your program/script on any server you want.
Since often - there are issues using psexec - you may invoke your scripts from Task Scheduler etc.
I do that for 500+ servers and it works. If working for me it will work for you.
You might want to look at HTCondor (http://research.cs.wisc.edu/htcondor/) which could perhaps manage all of this for you.
I need to allow an external client to change the IP of the Linux machine where the program is running (C++). I already know how to list all the local interfaces and the current IPs assigned to them. I also know how to programatically change said IPs.
What I need to know is how to make this change permanent so, if the machine reboots, it keeps the same network configuration.
What's the best way to do this? Manually parsing /etc/network/interfaces? Calling some linux command?
Edit: I'm using Debian.
Thanks!
Yes, manipulating /etc/network/interfaces is the way to accomplish that (just store the backup in case things go wrong).
Also, if interfaces are managed by network manager (which is rarely the case for servers, but happens on the desktop), you may manipulate it via dbus calls, I think.
You should've mentioned distribution, btw, not the language — if you didn't mention the file it would be impossible to guess ;-)
To make changes permanent, you have to write the network configuration in /etc/network/interfaces and maybe DNS Servers (resolv.conf).
http://wiki.debian.org/NetworkConfiguration
If you don't want to parse the interfaces each time, you could save the IP and Network in a config file to restore it.
Then you have to rewrite "/etc/network/interfaces" only.
After Changes to the network interface configuration, you have to restart the network stack (distro specific).
Restart Interfaces with auto :
$ /etc/init.d/networking restart
Restart other interfaces:
$ ifup [iface]
You can call ifconfig and route commands in a script or better, you can edit the file you mention, depending on your Linux distro.
I want to have an application or service that is running that, on some schedule, can disable access to the internet for all applications except for specific ones.
I'm trying to create a filter that can be turned on or off under programmatic control. Not just IP addresses and ports, but I want to be able to block specific applications as well, much like Zone Alarm and other software firewalls let you block.
For example, iexplore.exe, skype.exe, firefox.exe, aim.exe. But still need to allow other applications to connect as needed.
It has to work on Vista as well as XP, but I kind of expect that the method will be different on each of those platforms.
Basically, the filter has to tie the network communication back to the executable that is making the request and then allow or deny it.
Update:
On Vista at least, it looks like I want to use filters in the ALE layers of the WFP.
On XP, I'm still looking for the best way to do it. Do I really need to be writing device drivers and dealing with kernel stuff? I'm just a lowly application developer. Kill me now.
Update 2:
Currently looking at the PfCreateInterface and related Pf* API's for pre-Vista systems.
You can change both Vista and XP's firewall policies dynamically using the INetFwAuthorizedApplications interface from the Windows Firewall API.
Also see this question.
You'll have to write a device driver that filters traffic based on the executable requesting the traffic.
by limiting its access to internet using firewall. go to firewall setting advanced tab (win 7)
and do that
I'm not sure, but I think you'd need to do it by getting the program to run as a user that has limited permissions, the question is, can you make a user account that stops such things?
You'll need to redirect all (or at least many) calls to the WinSock API functions of any running program to your own replacement functions. That means getting into the memory of each running program and hijacking those functions, which is an... interesting... exercise. :-)
That might be enough of a pointer to get you started, or at least to suggest some more specific questions to ask.
Could you move aside (ie rename) the system's winsock DLL and replace it with your own ?
Yours should provide the same API, but check the the process name of incoming requests... return an error code to blocked applications and forward the calls from allowed apps onto the real DLL.