C program inetd service

Show 4 more comments. Kevin 37k 14 14 gold badges 83 83 silver badges bronze badges. Yes I have read about inetd is more link towards network stuff. So any good tutorial for me to start my daemon properly via it? Cause I google and found many confusing things. This is not a good place for a detailed guide. It might be better for you to ask specific questions that confuse you as individual questions. Pretty clever.

TekOps TekOps 61 2 2 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Stack Gives Back Safety in numbers: crowdsourcing data on nefarious IP addresses. Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually.

Related 3. Hot Network Questions. Question feed. This is defined because a network daemon will generally listen for a request, then fork a child process to handle that request. It takes time for that fork and child process to start up. Therefore we set the listen queue size to buffer up multiple connections, giving us time to spawn the children to do the work.

This also prevents our network daemon from becoming saturated with too many connection requests. IP Address: All sockets need to be assigned an address. The 32 bit address is broken down into 4, 8-bit bytes, each byte separated by a dot. For example An IP Address consists of 2 parts, a network part and a host part. The network part is always at the begining of the IP addres and the host part is always at the end. The separation point of the network part and the host part depends on the class of IP Address and the Netmask.

There are several classes of IP Address,. Netmask: This is a number that is used to identify the part of the IP Address that represent the network portion. This is a mask word that has it's bits set to one to represent the network part. The netmask is also used for determining routing. A notation to represent an IP Address with specification that indicates the number of bits to be viewed as the network part, above and beyond the netmask. As another example, consider the class B address Normally the netmask for a class B address would be We can use CIDR to specify that not the first 16 bits are network part, but rather the first 24 bits are network part, and the last 8 bits are host part, Port: All sockets also need to be assigned a port number.

When we identify a network connection we generally reference an IP Address and a port number. Ports 1 thru are reserved as priviledged ports, only accessible by programs running as root. This is the hardware that provides the connection to the computer. Usually a plugin card that connects to your network.

Two catagories, wired and wireless. That little plug on the back of your computer that looks like a phone jack, only wider, is connected to a NIC.

If we were to write a network service in C, the sequence would be:. This is called an accept. There's quite a few lines of C code to implement the above sequence. The same hold true if you wish to use Perl to implement a socket. I don't find Perl provides any significant shortcuts to socket programing, with the exception of using some cpan package.

In addition, if you write your network daemon in Perl, then you need to come up with a means to start it at boot time. Not a big issue with using an RC script, but there's a simpler way. The inetd super server provides an excellent method to implement a network service. You can use just plain old script code to write your service. What inetd does is that he opens a socket, on the port number you specify, and waits for a connection request. When a connection occurs, he forks a child that executes the program you specify.

The first thing you need to do to create an inetd service is to define a port number and name for the service. This defines a service, named diskuse, that runs on port using the TCP protocol. There might be more advanced stuff you can do, i'm not sure. It only gets complicated when you want two clients to be able to talk to each other, but that's not much different than console apps either. I'm not sure about timeouts, but you can do that within the program with signals without too much trouble.

Is it joint to cout? I imagine it'd either go to the same place as cout , or to an error log set up by inetd. Dwight Spencer Dwight Spencer 1, 15 15 silver badges 22 22 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Stack Gives Back Safety in numbers: crowdsourcing data on nefarious IP addresses. Featured on Meta.

New post summary designs on greatest hits now, everywhere else eventually. Linked 0. Related Hot Network Questions. Question feed.