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[7.2 Beta] mono_getStaticFieldValue usage?

 
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ShaRose
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Posts: 26
PostPosted: Sun Oct 25, 2020 1:12 pm    Post subject: [7.2 Beta] mono_getStaticFieldValue usage? Reply with quote
I can't seem to figure out how to coax mono_getStaticFieldValue to give me the same pointers that mono_class_getStaticFieldAddress + offset gives me. They should be able to get the same values, but it seems they are always off. Test code below:

Code:
if syntaxcheck then return end
if LaunchMonoDataCollector() == 0 then return end
local className = "MainManager"
local classID = mono_findClass("", className)
local staticField = nil
local staticOffset = nil
local fields = mono_class_enumFields(classID)

for i=1,#fields do
   local field = fields[i]
   if field.name == "instance" then
      staticField = field.field
      staticOffset = field.offset
   end
end

function numornil(input)
   if input == nil then
      return "NIL"
   end
   return string.format("%X", input)
end

print("staticOffset is",staticOffset)
local domain = mono_enumDomains()[1]
print("OLD   "..numornil(mono_class_getStaticFieldAddress(domain, classID)))
print("NEW 1 "..numornil(mono_getStaticFieldValue(mono_class_getVTable(domain,classID),staticField)))
print("NEW 2 "..numornil(mono_getStaticFieldValue(mono_class_getVTable(domain,classID),readPointer(staticField))))
print("NEW 3 "..numornil(readPointer(mono_getStaticFieldValue(mono_class_getVTable(domain,classID),staticField))))
print("NEW 4 "..numornil(readPointer(mono_getStaticFieldValue(mono_class_getVTable(domain,classID),readPointer(staticField)))))


And the results:

Code:
staticOffset is 0
OLD   168E6B73450
NEW 1 16AB3351B40
NEW 2 168E6C93456
NEW 3 16A4FC66CD0
NEW 4 NIL


From what I can gather, field.field is what I'm supposed to pass (Most other values either aren't valid or crash the game), but I can't be sure.
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Dark Byte
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PostPosted: Sun Oct 25, 2020 1:46 pm    Post subject: Reply with quote
mono_getStaticFieldValue may return a new Object wrapping the old object, whereas reading by offset accesses it directly.
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ShaRose
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Joined: 12 Jan 2010
Posts: 26
PostPosted: Sun Oct 25, 2020 2:33 pm    Post subject: Reply with quote
If it returns a wrapped object, how do I access the original? It doesn't seem like all the pointers are wrapped the same.

Code:
if syntaxcheck then return end
if LaunchMonoDataCollector() == 0 then return end
local className = "MainManager"
local classID = mono_findClass("", className)
local staticField = nil
local staticOffset = nil
local fields = mono_class_enumFields(classID)

for i=1,#fields do
   local field = fields[i]
   if field.name == "instance" then
      staticField = field.field
      staticOffset = field.offset
   end
end

function testStoreManager(input)
   if input == nil then
      return nil
   end
   local currentAddress = readPointer(input)
   if currentAddress == nil or currentAddress == 0 then
      return nil
   end
   local offset = getAddressSafe("MainManager.storeSDKManager")
   if offset == nil then
      return nil
   end
   currentAddress = readPointer(currentAddress + offset)
   if currentAddress == nil or currentAddress == 0 then
      return nil
   end
   return currentAddress
end

function numornil(input)
   if input == nil then
      return "NIL"
   end
   return string.format("%X", input)
end

print("staticOffset is",staticOffset)
local domain = mono_enumDomains()[1]
print("OLD   "..numornil(testStoreManager(mono_class_getStaticFieldAddress(domain, classID))))
print("NEW 1 "..numornil(testStoreManager(mono_getStaticFieldValue(mono_class_getVTable(domain,classID),staticField))))
print("NEW 2 "..numornil(testStoreManager(mono_getStaticFieldValue(mono_class_getVTable(domain,classID),readPointer(staticField)))))
print("NEW 3 "..numornil(testStoreManager(readPointer(mono_getStaticFieldValue(mono_class_getVTable(domain,classID),staticField)))))
print("NEW 4 "..numornil(testStoreManager(readPointer(mono_getStaticFieldValue(mono_class_getVTable(domain,classID),readPointer(staticField))))))


Returns:

Code:
staticOffset is 0
OLD   13F305EF540
NEW 1 13E841D3450
NEW 2 NIL
NEW 3 NIL
NEW 4 NIL
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Dark Byte
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PostPosted: Sun Oct 25, 2020 7:01 pm    Post subject: Reply with quote
have you checked out the data it points to? If it's the correct variable type in structure dissect ?
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ShaRose
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Joined: 12 Jan 2010
Posts: 26
PostPosted: Mon Oct 26, 2020 12:46 pm    Post subject: Reply with quote
Yeah, the new method's pointer gives me invalid data. storeBranchType was 404 instead of the correct 0 (It's an enum that only goes 0-3).

MainManager is similarly invalid (But it doesn't have any obvious hints like an enum as almost all fields are pointers to other objects).

Edit:

I just figured it out thanks to taking a shower, as per usual. Here's the updated code:

Code:
if syntaxcheck then return end
if LaunchMonoDataCollector() == 0 then return end
local className = "MainManager"
local classID = mono_findClass("", className)
local staticField = nil
local staticOffset = nil
local fields = mono_class_enumFields(classID)

for i=1,#fields do
   local field = fields[i]
   if field.name == "instance" then
      staticField = field.field
      staticOffset = field.offset
   end
end

function testStoreManager(input)
   if input == nil then
      return nil
   end
   -- Notice I'm not reading the pointer this time?
   local currentAddress = input
   if currentAddress == 0 then
      return nil
   end
   local offset = getAddressSafe("MainManager.storeSDKManager")
   if offset == nil then
      return nil
   end
   currentAddress = readPointer(currentAddress + offset)
   if currentAddress == nil or currentAddress == 0 then
      return nil
   end
   return currentAddress
end

function numornil(input)
   if input == nil then
      return "NIL"
   end
   return string.format("%X", input)
end

print("staticOffset is",staticOffset)
local domain = mono_enumDomains()[1]
-- Notice the readPointer for the old Method?
print("OLD   "..numornil(testStoreManager(readPointer(mono_class_getStaticFieldAddress(domain, classID)))))
print("NEW 1 "..numornil(testStoreManager(mono_getStaticFieldValue(mono_class_getVTable(domain,classID),staticField))))
print("NEW 2 "..numornil(testStoreManager(mono_getStaticFieldValue(mono_class_getVTable(domain,classID),readPointer(staticField)))))
print("NEW 3 "..numornil(testStoreManager(readPointer(mono_getStaticFieldValue(mono_class_getVTable(domain,classID),staticField)))))
print("NEW 4 "..numornil(testStoreManager(readPointer(mono_getStaticFieldValue(mono_class_getVTable(domain,classID),readPointer(staticField))))))


So yeah, mono_getStaticFieldValue obviously returns the VALUE, not a pointer to it. Which should have been obvious. Rolling Eyes

Works now, though.
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