Server Version needs Update

[looneypumpkin]

That stinks.

[diamon80]

Can we rollback to an older version on this or the test server?

 

I see those Eastern Europeans still got their servers up.

[drag]

I am so bored it hurts.

[Baloosh]

Looks like 4 player Campaign mode for now!

 

[blqmagic]

Im going through withdrawal at this point. So upset that valve did this.

[crasx]

oh my GUYS! I just realized theres this thing called an "outside"!

 

meh too lazy

[MPG1770]

Just been on steam forums - to top all the the aggro they are having a L4D2 free weekend - fix it after the free weekend has finished

[Tsunami]

Anyone knows when the server will be up again ? I'm so bored XD

[Yortz]

my first post, yay

 

too hot to go outside, it's 108*

sooooo just keep waiting, just keep waiting, just keep waiting waiting waiting...........

[crasx]

i've been playing minecraft... it's like outside?

 

looks like its fixed?

 

iim serious this time

http://hg.alliedmods.net/releases/sourcemod-1.5/

[zero0]

oh my are we almost fixed??

Edited July 4, 2013 by zero0

[crasx]

nope. i think left4downtown needs to be updated. I may be able to do that myself

 

checked, yes, l4downtown2 needs to be updated. I wou8ld, but its the 4th and i need to go blow stuff up. sorry guys. if it's not fixed tomorrow ill do it myself. If anyone knows reverse engineering and understands function signatures message me, I will need help.

[MPG1770]

save a crate of fireworks just incase you come accross a horde of zombies

[diamon80]

nope. i think left4downtown needs to be updated. I may be able to do that myself

 

checked, yes, l4downtown2 needs to be updated. I wou8ld, but its the 4th and i need to go blow stuff up. sorry guys. if it's not fixed tomorrow ill do it myself. If anyone knows reverse engineering and understands function signatures message me, I will need help.

 

Msg me on steam if you need help with their C functions.

[crasx]

alright, so im going to attempt this now. I haven't done anything this 1337 for a while so it may take me some time to get into the groove.

 

You can follow my progress here: https://docs.google.com/spreadsheet/ccc?key=0AkTG1rMOeyg9dDlDUXozcVpoc1diSnp5YUNEcjBQRVE&usp=sharing

 

Basically i need to fill up that spreadsheet and hope it works after

[Baloosh]

Go ahead and add that "Stop Swatfishy from haxing" function while you're at it.

 

Thanks in advance.

Edited July 5, 2013 by Baloosh

[crasx]

currently downloading the linux and windows servers, so i thought id write an explanation of what is going on for any aspiring hackers (and to get my mind in the zone)

 

When people create applications they use a high or mid level language like c++. for example:

int add(int a, int {
return a+b;
}

 

Now, the processor doesn't know what to do with the above because the processor only works with a language called assembly. Assembly looks like this roughly for the above function (I haven't written asm for like 8 years so this may be a bit off):

pop eax
pop ebx
add ebx, eax
push ebx

This code is represented in binary/hex in the actual computer. For example the above may be stored as "48 a4 bc 02 59". Plugins like left4downtown hook into functions to allow us to process data before it is sent into the function. In order to hook into these functions the plugin needs to know where they are, and this is where crap hits the fan.

 

We can't use the actual location because that changes with every new version of the server and fixing it would be totally inefficient. So sourcemod uses function signatures, which are basically a unique set of bytes found only one place in the file. In the above example the signature would be "x48xa4xbcx02x59". When ever the plugin loads it scans the file for these bytes and hooks the function as needed

 

With the recent server modification these signatures changed because valve implemented linux and now all of these signatures are invalid. For example "x48xa4xbcx02x59" may actually be "x11xa4xaax02x50". So my job is to find these new signatures.

 

Normally this is near impossible without debugging techniques, but we have and advantage- linux. In linux files function addresses are stored in a vtable. This vtable says something like "add 0x4001001" which means function add is at address 4001001. Windows does not have a similaer vtable which is why we use function signatures. So using the linux address I can get a rough idea of where the function is in windows and search the windows file to find similar logic. i then need to get the unique bytes, save them in the left4downtown config file.

 

This also explains why linux servers are already online

 

Make sense?

[Mercman]

currently downloading the linux and windows servers, so i thought id write an explanation of what is going on for any aspiring hackers (and to get my mind in the zone)

 

When people create applications they use a high or mid level language like c++. for example:

int add(int a, int {
return a+b;
}

 

Now, the processor doesn't know what to do with the above because the processor only works with a language called assembly. Assembly looks like this roughly for the above function (I haven't written asm for like 8 years so this may be a bit off):

pop eax
pop ebx
add ebx, eax
push ebx

This code is represented in binary/hex in the actual computer. For example the above may be stored as "48 a4 bc 02 59". Plugins like left4downtown hook into functions to allow us to process data before it is sent into the function. In order to hook into these functions the plugin needs to know where they are, and this is where crap hits the fan.

 

We can't use the actual location because that changes with every new version of the server and fixing it would be totally inefficient. So sourcemod uses function signatures, which are basically a unique set of bytes found only one place in the file. In the above example the signature would be "x48xa4xbcx02x59". When ever the plugin loads it scans the file for these bytes and hooks the function as needed

 

With the recent server modification these signatures changed because valve implemented linux and now all of these signatures are invalid. For example "x48xa4xbcx02x59" may actually be "x11xa4xaax02x50". So my job is to find these new signatures.

 

Normally this is near impossible without debugging techniques, but we have and advantage- linux. In linux files function addresses are stored in a vtable. This vtable says something like "add 0x4001001" which means function add is at address 4001001. Windows does not have a similaer vtable which is why we use function signatures. So using the linux address I can get a rough idea of where the function is in windows and search the windows file to find similar logic. i then need to get the unique bytes, save them in the left4downtown config file.

 

This also explains why linux servers are already online

 

Make sense?

 

 

Thanks crasx

 

and NO!

[swatfishy]

cell a29 lmao

[crasx]

basically:

 

I FEEL SO 31337

[Baloosh]

cell a29 lmao

 

Looks like your offset is wrong. Should be a 666 in there somewhere, obv

Edited July 5, 2013 by Baloosh

[crasx]

finally got servers downloaded. just decompiled...

 

here is my desktop[

 

http://i.imgur.com/y02Ulb3.png

 

left and right are linux, middle is windows. dat 16GB ram. Also watching dr who on my other screen

[Sashimi]

currently downloading the linux and windows servers, so i thought id write an explanation of what is going on for any aspiring hackers (and to get my mind in the zone)

 

When people create applications they use a high or mid level language like c++. for example:

int add(int a, int {
return a+b;
}

 

Now, the processor doesn't know what to do with the above because the processor only works with a language called assembly. Assembly looks like this roughly for the above function (I haven't written asm for like 8 years so this may be a bit off):

pop eax
pop ebx
add ebx, eax
push ebx

This code is represented in binary/hex in the actual computer. For example the above may be stored as "48 a4 bc 02 59". Plugins like left4downtown hook into functions to allow us to process data before it is sent into the function. In order to hook into these functions the plugin needs to know where they are, and this is where crap hits the fan.

 

We can't use the actual location because that changes with every new version of the server and fixing it would be totally inefficient. So sourcemod uses function signatures, which are basically a unique set of bytes found only one place in the file. In the above example the signature would be "x48xa4xbcx02x59". When ever the plugin loads it scans the file for these bytes and hooks the function as needed

 

With the recent server modification these signatures changed because valve implemented linux and now all of these signatures are invalid. For example "x48xa4xbcx02x59" may actually be "x11xa4xaax02x50". So my job is to find these new signatures.

 

Normally this is near impossible without debugging techniques, but we have and advantage- linux. In linux files function addresses are stored in a vtable. This vtable says something like "add 0x4001001" which means function add is at address 4001001. Windows does not have a similaer vtable which is why we use function signatures. So using the linux address I can get a rough idea of where the function is in windows and search the windows file to find similar logic. i then need to get the unique bytes, save them in the left4downtown config file.

 

This also explains why linux servers are already online

 

Make sense?

This post owns and you own. Thanks for fixing the server!

[crasx]

so, im calling it quits for the night. This is super hard, asking for help on the other forums.

 

Basically for all 30 of these functions I need to make educated guesses using strings and knowledge of assembly and... this is going to involve a lot of crying

[TheDude]

LESS CRYING, MORE WORKING MARSHMELLOW BOY

 

Just kidding, take your time