Linux Server Linux Server Hacks: Los Mejores Trucos the by Bill Von Hagen, Brian K. Jones

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By Bill Von Hagen, Brian K. Jones

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Extra resources for Linux Server Linux Server Hacks: Los Mejores Trucos the Best Tricks

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Source Displays the source code of the disassembled module if a program debug database is present. Finally, the Settings button opens the OllyDbg settings window. Keep the default settings for now. Now that you’ve had a tour of the main OllyDbg window, let’s explore the CPU, Patches, and Run Trace windows more closely. You’ll use those windows extensively as a game hacker, and knowing your way around them is key. OllyDbg’s CPU Window The CPU window in Figure 2-2 is where game hackers spend most of their time in OllyDbg because it is the main control window for the debugging features.

As a result, the expression [STRING EAX]=="ABC123", where EAX is a pointer to the string ABC123XYZ, will evaluate to 1 instead of 0. =EAX), the comparison will first assume the nonliteral operand is an ASCII string, and, if that compare would return 0, it will try a second compare assuming the operand is a Unicode string. x Of course, operators aren’t much use without operands. Let’s look at some of the data you can evaluate in expressions. Working with Basic Expression Elements Expressions are able to evaluate many different elements, including: CPU registers EAX, EBX, ECX, EDX, ESP, EBP, ESI, and EDI.

You don’t have to play, only hack. 46 Chapter 2 ✁ ✂ ✄ ☎ ✁ ✆ ✝ ✞ ✟ ✠ ✡ ☛ ✁ ☞ ✌ ✍ ✎ ✆ ✆ ✄ ✏ ✏ ✑ ✒ ✓ ✔ ✕ ✖ ✗ ✘ ✍ ✙ ✞ ✆ ✝ ✚ ✁ ✟ ✛ To start, attach OllyDbg to the game. exe in the module list and double-click it) and use the Referenced Text Strings feature to locate the string that is displayed when the ball is hidden. Next, double-click on the string to bring it up in the code and analyze the surrounding code until you find the if() statement that determines whether to hide the ball. Lastly, using the code-patching feature, patch the if() statement so the ball is always drawn.

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