Winsock Hook problem

[cogumel0]

I got a little problem with my program, still trying to figure out a way around it.

I inject my dll into a program with CreateProcessEx, and then, if I try to hook the winsock before the program has made any attempt to send information to the net, the program where I injected my dll crashes. It doesn't give any error while hooking... it just crashes when the program actually tries to access the internet.

Also, after hooking, I can't send packets from my application until a packet is actually sent from the other program (this is easily explained by the "DataSocket := 0"). Still, is there anyway around this?

Thx in advance,
Cogumel0

[madshi]

Try leaving the hook callback function empty - except calling the original API. Something like this:

function HookCallback(...) : ...;
begin
result := HookNext(...);
end;

Does it work that way?

[cogumel0]

function HookCallback?

I don't even use that nor do I know what it's for or even where to put it

This is how I hook it and all I do to hook it:

Code: Select all

Function HookWinsock(): boolean;//True if successful
begin
  try
    hookapi('ws2_32.dll','send', @sendHookProc, @sendNextHook);
    hookapi('wsock32.dll','send', @sendHookProc, @sendNextHook);
    HookWinsock:=True;
  except
    HookWinsock:=False;
  end;
end;

[madshi]

You can't use the same hook and callback function for hooking two different APIs. So use "sendHookProc1" and "sendHookProc2". Then try to leave "sendHookProcX" empty (except calling the original API, of course).

[nildo]

Theres no need to hook both library. Hook just w2_32.dll