I wanna use a TUI over telnet connection between two Linux boxes like ncurses, is there a way to do this or to use TUIs through telnet in C?
Do you mean you want to telnet to a server machine and run an ncurses application, or do you somehow want to run a UI on one machine, and a backend on the other. If it's the former, you just need to set the TERM environment variable correctly on the server machine before running your program (i.e., export TERM=vt100).
If it's the latter, then ncurses itself isn't going to do any networking, but you could certainly write a client that uses ncurses, and have the client talk to a server backend in some way.
Related
Is it possible to migrate a single and particular TCP connection inside a running process in one machine to another machine using CRIU tools in Linux?
What I want is to dump a particular TCP Connection information in a memory and transfer this information to a peer machine. Inside this machine, I will use the dumped information to recreate the the migrated TCP connection. Does anyone have an example or tutorial in c language?
I am aware about different solutions like SockMi which provides Kernel Module + User Space APIs to migrate a certain TCP Socket. However, I want to use CRIU tools since it is part of Linux Mainline.
Right now we only have the TCP migration functionality integrated into CRIU tool. It sits in the sk-tcp.c file, the whole TCP-repair code is there, though it's bound to the rest of CRIU.
On the other hand, we've been asked for TCP-only migration for quite a while, it's possible to pull this code into smth like libcriutcp.so, but it will require patching. You're welcome to participate to the https://github.com/xemul/criu/issues/72
I have two C/C++ socket programs, say server and client, and both communicate to each other through read and write. The entire flow works fine (i.e., communication, read, write) when I run the two programs on two separate terminals in localhost. To avoid manually starting the client program, I use system(exec_cmd_to_run_client_program) in my server program. However, doing so doesn't give me the correct result as that of two separate terminals. I do see server and client running in the job monitor, but the communication in between seems never happens. What could be the problem?
Also I tried using ssh library libssh in the server program to open a new ssh session and send execution command to run the client program. Again I see the same result as system call. Both programs showed up in the job monitor but communication never happens. Did I miss something?
I have an embedded system that is programed in C. I need to do the equivalent to the DOS command Telnet. The idea is to test if the remote host is up and running.
I would like to have some orientation here like:
Open source project that I can use as a guide line (C language)
Some documentation on what the Telnet command does (so I can
implement my own)
Thanks
Update: Thank you for your valuable comments
My system connects to a host via GPRS/Ethernet/dial up/Wifi (one of them). As a developer I check if the host is ok by using my windows laptop (with a Dial up modem, GPRS modem or whatever is needed) and running Telnet like this:
telnet 192.168.0.1 8000
(non real values)
If the host is ok I got the clean screen, otherwise I got an error. That's what I need to do in code, to be able to determine if the host is up and running by using a sort of DOS telnet client command in C.
This is done once, just to check communications, after this test is cleared the real info should be sent.
I am using 80(http) and 443(https) default ports for my webserver.
What ther ports other than this can i use for my webserver.
I need this basically to start my webserver using non-default ports.
Any. Look at these for the ones to not use:
http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
You can use whatever ports you want to use, provided no other server on your box is also trying to use it.
This is, of course, subject to any OS-specific issues like needing to run with elevated privileges for binding to ports below 1024.
The IANA (naming authority) and ICANN (assigned names and numbers) is responsible for assigning ports to specific applications but there's nothing requiring you to follow those "rules" at all.
If you use (for example) port 23 for your HTTP server, that will work. It's likely to confuse any telnet programs attempting to connect to that box but, as stated, the box is under your jurisdiction, not that of the IANA. Provided your browsers hook up to the specific port 23, they'll work just fine.
By way of example, many IBM mainframe systems will use port 23 for their 3270-protocol terminal programs and bump "real" telnet up to port 1023.
And, in any case, why should you not use a port because it's "allocated" to the Quake game server, or Dropbox, or Symantec bloatware? :-)
I need to send a signal via my remote PC to the Internet that let me know if this pc is connected.
I could send a link with GET values to my page and then from that php page make a query to the database.
How do I send this value through a C program that runs on this remote PC?
thanks!
(it's a windows pc)
For making HTTP requests I recommend libcurl, which is the library that almost everybody seems to be using.
http://curl.haxx.se/libcurl/
What operating system? Linux? Windows? Does the program need to be cross-platform? The reason I ask is that it influences whether you should use a library, or TCP/IP sockets, given that the request will be very simple.
Also, why not use Perl, or better yet, wget? You could schedule a task in windows, or a cronjob in unix, to wget http://yoururl/path?pcname=`uname` or similar..
What about using a client like dyndns? I'm not sure using a C program would be such a good idea for that purpose; it's a system administration task and using scripting for this would work best, unless you have a specific need in mind.