Forcing a player to dig a block

I am developing a plugin for a server, called mcRPG (basically like mcMMO, without the leveling). A problem we've come over, though, is the ability to break Obsidian faster (like in mcmmo). In that plugin, it can break through faction land that is not your own, so I tried sending the Packet14BlockDig packet from the player to the server, but I honestly don't know how to use it.
My current code:

Code:

                Packet14BlockDig packet = new Packet14BlockDig();
                packet.a = 0;//2;
                packet.b = 0;//block.getLocation().getBlockX();
                packet.c = 0;//block.getLocation().getBlockY();
                packet.e = 0;//block.getLocation().getBlockZ();
                ((CraftPlayer)pl).getHandle().netServerHandler.sendPacket(packet);

Could someone explain which each variable for that packet means?

 

I do some client modding, fairly sure that b is Y, and c and e are X and Z, but i dont know which of c and e is x and z. Not sure what a is, i never really mess with block breaking. in my mods.

 

Anyone else have any information?
I checked the craftbukkit github, there's only Packet3 and Packet51 documentation :/

 

The full net.minecraft.server code that craftbukkit uses is at the mc-dev repo at github, craftbukkit only contains the classes that were modified.
https://github.com/Bukkit/mc-dev
The Packet classes contain information about how the variables are written to the DataOutputStream.
Together with this reference, it should help you out:
http://mc.kev009.com/Protocol#Player_Digging_.280x0E.29

 

You are gonna run into hell with that. You need to have a timer to send it each time. The server will only accept packets at a max of about ~3x faster than normal, so doing that with the only delay being execution time will result in it being broken client and then the server placing it back.
I can't remember what the variables are but if you look at the function that calls them the arguments are in order, xyz.

 

also im 99% sure ((CraftPlayer)pl).getHandle().netServerHandler.sendPacket(packet);
will send the packet to the client instead of the server