63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
extern "C" int P2PRequestHandler(long long steamID) {
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for (DLL* dll: modDLLs) {
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if (dll->HandleP2PRequest) {
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if ( int result = ((int(*)(long long))dll->HandleP2PRequest)(steamID) ){
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return result;
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}
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}
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}
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return 0;
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}
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GETTER_VAR(void*, ASMP2PRequestHandler_jmpback);
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GETTER_VAR(void*, ASMP2PRequestHandler_block);
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GETTER_VAR(void*, ASMP2PRequestHandler_allow);
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void ASMP2PRequestHandler() {
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asm(".intel_syntax \n"
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PUSH_ALL
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"mov rcx, [rdi] \n" //incoming steam id
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PREPARE_STACK
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"call P2PRequestHandler \n"
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RESTORE_STACK
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// Did the handler return 1? block
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"cmp eax, 1 \n"
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"je 1f \n"
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// Did the handler return 2? allow
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"cmp eax, 2 \n"
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"je 2f \n"
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// Otherwise? Do nothing
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POP_ALL
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// original code
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"mov edx, 4 \n"
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"mov rcx, [rax] \n"
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"mov rax, [rcx] \n"
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"call qword ptr [rax+0x18] \n"
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DEREF_JMP(ASMP2PRequestHandler_jmpback)
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"1: \n" //block
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POP_ALL
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DEREF_JMP(ASMP2PRequestHandler_block)
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"2: \n" //allow
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POP_ALL
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DEREF_JMP(ASMP2PRequestHandler_allow)
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);
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}
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void SetupP2PRequestHandler() {
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WriteFarJMP(Offset(base, 0x9F6DF), (void*)&ASMP2PRequestHandler);
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ASMP2PRequestHandler_jmpback = Offset(base, 0x9F6ED);
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ASMP2PRequestHandler_block = Offset(base, 0x9F7A6);
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ASMP2PRequestHandler_allow = Offset(base, 0x9F783);
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}
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