crossbowerbt/dhcpserver

A stand-alone DHCP server, written in C.

DHCP Server

A stand-alone DHCP server, implemented as an attempt to better grasp the chaos which is the current descendant of the good ol' BOOTP.

Implemented in pure C, no dependencies. Still in beta :)

Usage

You can either launch the binary file directly, specifying all the required options, or use the launch_server.sh script, that also includes the configuration.

Configuration

Portability was one of the objectives I had in mind while writing the code.

Since system and library calls used to retrieve informations (such as MAC addresses, IP addresses and other network-related stuff) differ greatly between *linux, *bsd and other unix-like systems, I decided to "outsource" them into a shell script.

The launch_server.sh contains all the configuration the server requires to run. Give a look at it, and you will understand how to use the program and how to configure it...

License

Copyright 2014 - Emanuele Acri

Offer me a coffee license: use the code as you wish, but offer me a coffee :)

dhcpserver's Issues

Bugs report

There are two bugs,one is in the args.c:111

     case 'p': // parse pending time
	    {
		time_t *t;

		if(parse_long(optarg, (void **)&t) != 4)
		    usage("error: invalid pending time.", 1);

		pool->pending_time = *t;
		free(t);
		break;
	    }

When you add ASAN during compilation, runtime errors will occur, mainly because free is used to free the memory space allocated for calling calloc, malloc, or realloc, rather than time_ t type（I’m not sure）

ASAN

gdb debug information

Another bug is in the options.c:387

void
append_option (dhcp_option_list *list, dhcp_option *opt)
{
    dhcp_option *nopt = calloc(1, sizeof(*nopt));
    memcpy(nopt, opt, 2 + opt->len);
    
    TAILQ_INSERT_TAIL(list, nopt, pointers);
}

When opt ->len is not properly initialized or has incorrect values, it can cause stack overflow issues in memcpy

ASAN

gdb debug information

Would you consider dual licensing?

Hi,

I'm looking for a simple dhcp server that I can adapt into a new BSD licensed embedded system framework (esp-open-rtos). Yours is my preferred candidate, it looks perfect and it shouldn't be too hard to port to a microcontroller IP stack!

However I want to keep esp-open-rtos as BSD licensed. It's unclear to me whether how the "coffee license" works regarding relicensing!

Would you possibly consider dual-licensing your dhcpserver as either coffee license or New BSD, with a non-binding request that BSD licensees please buy you a cofee? That way I can include your project!

I will also gladly buy you a coffee, and if the porting efforts come up with any upstream-friendly changes then I will submit those back as PRs. :)

Of course it's your project so if you want to keep the license the way it is, that's absolutely fine. I just thought I'd ask on the offchance.

Cheers,

Angus

error: ‘pointers’ undeclared

Nothing compiles on Ubuntu Linux. What was the development platform? Is code missing?

PADDING option not handled

in parse_options_to_list padding option is not handled
see rfc2132 p3.1
3.1. Pad Option
The pad option can be used to cause subsequent fields to align on
word boundaries.
The code for the pad option is 0, and its length is 1 octet.