On Fedora:
yum install termdebugin ~/.vimrc
let g:termdebug_config = {}
let g:termdebug_config['command'] = 'rust-gdb'
packadd! termdebug
Inside vim:
Termdebug target/debug<executable>
Use Ctrl-W DownArrow to switch between windows
Use :Break to set a breakpoint in the code window
Use Ctrl-W UpArrow to go to the gdb window
use run to run the program and cont to continue after hitting a break point.
I use tags to navigate source code in vim. Here is how I set things up for generating tags for rust.
Continue readingIced looks like a decent toolkit for writing desktop apps. I wanted the bog-simplest program I could start with. I think this is it. Based on a few tutorials I have found around.
Continue readingFor years now I have wanted to write a DI framework for Rust like I wrote for C++:
http://adam.younglogic.com/2008/07/dependency-injection-in-c/
However, I have not been able to wrap my head around how to do that. The problem is that the DI framework, which both creates and shares the instances, will come in to conflict with the borrow checker.
I had not taken the time to try and work with Rust on ARM64 in the past. Since I was doing disassembly of simple C programs on an one of our servers, I figured it couldn’t hurt to try the same thing with rust.
Continue readingThe key piece of persisted data in an DHCP server is the lease. A lease is a the mapping between a MAC address and an IP address, limited in time. A Lease typically has a start time and an end time, but can be renewed. Because I am still living in an IPV4 world, I have to deal with arbitrarily small pools of IP addresses. Thus, the design needs to strike the balance between static and dynamic: a machine should generally get back the same IP address each time. However, if addresses get tight, address reuse should be aggressive.
Continue readingTo capture DHCP packets I ran:
tcpdump port 67 -i vnet0 -vvvv -w /tmp/packets.bin
That gave me a binary file 940 bytes long. This is actually 2 packets: the request and the response. This has the IP header, the UDP header, and the DHCP packet payload in it.
Continue readingThe Extract Function refactoring is the starting point for much of my code clean up. Once a “Main” function gets sufficiently complicated, I pull pieces of it out into their own functions, often with an eye to making them methods of the involved classes.
While working with some rust code, I encountered an opportunity to execute this refactoring on some logging code. Here’s how I executed it.
Continue readingNow that I can list the group names, I want to be able to list the member of the groups.
Continue readingNow that I know I can read a single group, the next step is to iterate.
Continue reading