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Fix instant mining of blocks not being recognised, tweak anti-cheat (#4938) 

* Tried to fix a small issue...

Ended up rewriting a bunch of god awful, opaque code with no source
and no sense. Who names a function GetPlayerRelativeBlockHardness???
It's gone now. We're safe again.

* Testing anti-cheat.

* Tidy up debug logging.

* Remove empty member declaration.

* Rewrite GetDigSpeed slightly for better readability.

* GetMiningProgressPerTick now returns 1 when instantly mined. Fixed hasily written typo.

* Comment style and typo fixes.
This commit is contained in:
KingCol13 2020-10-02 23:57:17 +03:00 committed by GitHub
parent 89fb16fc27
commit cd1b507745
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 109 additions and 49 deletions
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32
src/BlockInfo.cpp
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@ -1466,22 +1466,22 @@ cBlockInfo::cBlockInfoArray::cBlockInfoArray()
Info[E_BLOCK_END_BRICKS ].m_Hardness = 0.8f;
Info[E_BLOCK_STRUCTURE_VOID ].m_Hardness = 0.0f;
Info[E_BLOCK_OBSERVER ].m_Hardness = 3.5f;
Info[E_BLOCK_WHITE_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_ORANGE_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_MAGENTA_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_LIGHT_BLUE_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_YELLOW_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_LIME_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_PINK_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_GRAY_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_LIGHT_GRAY_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_CYAN_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_PURPLE_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_BLUE_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_BROWN_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_GREEN_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_RED_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_BLACK_SHULKER_BOX ].m_Hardness = 0.2f;
Info[E_BLOCK_WHITE_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_ORANGE_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_MAGENTA_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_LIGHT_BLUE_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_YELLOW_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_LIME_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_PINK_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_GRAY_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_LIGHT_GRAY_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_CYAN_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_PURPLE_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_BLUE_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_BROWN_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_GREEN_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_RED_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_BLACK_SHULKER_BOX ].m_Hardness = 2.0f;
Info[E_BLOCK_WHITE_GLAZED_TERRACOTTA ].m_Hardness = 1.4f;
Info[E_BLOCK_ORANGE_GLAZED_TERRACOTTA ].m_Hardness = 1.4f;
Info[E_BLOCK_MAGENTA_GLAZED_TERRACOTTA ].m_Hardness = 1.4f;

3
src/BlockInfo.h
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@ -25,6 +25,9 @@ public:
inline static NIBBLETYPE GetLightValue (BLOCKTYPE a_Type) { return Get(a_Type).m_LightValue; }
inline static NIBBLETYPE GetSpreadLightFalloff(BLOCKTYPE a_Type) { return Get(a_Type).m_SpreadLightFalloff; }
inline static bool IsTransparent (BLOCKTYPE a_Type) { return Get(a_Type).m_Transparent; }
/** Warning: IsOneHitDig does not take into account enchantments / status effects / swim state / floating state
and therefore may be incorrect. Only use to check if hardness is 0
If you want to check if a player would instantly mine a_Block use cPlayer::CanInstantlyMine(a_Block) */
inline static bool IsOneHitDig (BLOCKTYPE a_Type) { return Get(a_Type).m_OneHitDig; }
inline static bool IsPistonBreakable (BLOCKTYPE a_Type) { return Get(a_Type).m_PistonBreakable; }
inline static bool IsRainBlocker (BLOCKTYPE a_Type) { return Get(a_Type).m_IsRainBlocker; }

14
src/ClientHandle.cpp
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@ -1301,8 +1301,8 @@ void cClientHandle::HandleBlockDigStarted(int a_BlockX, int a_BlockY, int a_Bloc
m_LastDigBlockZ = a_BlockZ;
if (
(m_Player->IsGameModeCreative()) || // In creative mode, digging is done immediately
cBlockInfo::IsOneHitDig(a_OldBlock) // One-hit blocks get destroyed immediately, too
(m_Player->IsGameModeCreative()) || // In creative mode, digging is done immediately
m_Player->CanInstantlyMine(a_OldBlock) // Sometimes the player is fast enough to instantly mine
)
{
HandleBlockDigFinished(a_BlockX, a_BlockY, a_BlockZ, a_BlockFace, a_OldBlock, a_OldMeta);
@ -1366,10 +1366,10 @@ void cClientHandle::HandleBlockDigFinished(int a_BlockX, int a_BlockY, int a_Blo
}
}
if (!m_Player->IsGameModeCreative() && !cBlockInfo::IsOneHitDig(a_OldBlock))
if (!m_Player->IsGameModeCreative() && !m_Player->CanInstantlyMine(a_OldBlock))
{
// Fix for very fast tools.
m_BreakProgress += m_Player->GetPlayerRelativeBlockHardness(a_OldBlock);
m_BreakProgress += m_Player->GetMiningProgressPerTick(a_OldBlock);
// Check for very fast tools. Maybe instead of FASTBREAK_PERCENTAGE we should check we are within x multiplied by the progress per tick
if (m_BreakProgress < FASTBREAK_PERCENTAGE)
{
LOGD("Break progress of player %s was less than expected: %f < %f\n", m_Player->GetName().c_str(), m_BreakProgress * 100, FASTBREAK_PERCENTAGE * 100);
@ -1410,7 +1410,7 @@ void cClientHandle::HandleBlockDigFinished(int a_BlockX, int a_BlockY, int a_Blo
World->DigBlock(absPos);
}
// Damage the tool:
// Damage the tool, but not for 0 hardness blocks:
auto dlAction = cBlockInfo::IsOneHitDig(a_OldBlock) ? cItemHandler::dlaBreakBlockInstant : cItemHandler::dlaBreakBlock;
m_Player->UseEquippedItem(dlAction);
@ -2120,7 +2120,7 @@ void cClientHandle::Tick(float a_Dt)
if (m_HasStartedDigging)
{
BLOCKTYPE Block = m_Player->GetWorld()->GetBlock(m_LastDigBlockX, m_LastDigBlockY, m_LastDigBlockZ);
m_BreakProgress += m_Player->GetPlayerRelativeBlockHardness(Block);
m_BreakProgress += m_Player->GetMiningProgressPerTick(Block);
}
ProcessProtocolInOut();

2
src/ClientHandle.h
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@ -562,6 +562,8 @@ private:
/** Shared pointer to self, so that this instance can keep itself alive when needed. */
cClientHandlePtr m_Self;
/** The fraction between 0 and 1, of how far through mining the currently mined block is.
0 for just started, 1 for broken. Used for anti-cheat. */
float m_BreakProgress;
/** Finish logging the user in after authenticating. */

86
src/Entities/Player.cpp
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@ -3156,61 +3156,109 @@ bool cPlayer::IsInsideWater()
float cPlayer::GetDigSpeed(BLOCKTYPE a_Block)
{
float f = GetEquippedItem().GetHandler()->GetBlockBreakingStrength(a_Block);
if (f > 1.0f)
// Based on: https://minecraft.gamepedia.com/Breaking#Speed
// Get the base speed multiplier of the equipped tool for the mined block
float MiningSpeed = GetEquippedItem().GetHandler()->GetBlockBreakingStrength(a_Block);
// If we can harvest the block then we can apply material and enchantment bonuses
if (GetEquippedItem().GetHandler()->CanHarvestBlock(a_Block))
{
unsigned int efficiencyModifier = GetEquippedItem().m_Enchantments.GetLevel(cEnchantments::eEnchantment::enchEfficiency);
if (efficiencyModifier > 0)
if (MiningSpeed > 1.0f) // If the base multiplier for this block is greater than 1, now we can check enchantments
{
f += (efficiencyModifier * efficiencyModifier) + 1;
unsigned int EfficiencyModifier = GetEquippedItem().m_Enchantments.GetLevel(cEnchantments::eEnchantment::enchEfficiency);
if (EfficiencyModifier > 0) // If an efficiency enchantment is present, apply formula as on wiki
{
MiningSpeed += (EfficiencyModifier * EfficiencyModifier) + 1;
}
}
}
else // If we can't harvest the block then no bonuses:
{
MiningSpeed = 1;
}
// Haste increases speed by 20% per level
auto Haste = GetEntityEffect(cEntityEffect::effHaste);
if (Haste != nullptr)
{
int intensity = Haste->GetIntensity() + 1;
f *= 1.0f + (intensity * 0.2f);
MiningSpeed *= 1.0f + (intensity * 0.2f);
}
// Mining fatigue decreases speed a lot
auto MiningFatigue = GetEntityEffect(cEntityEffect::effMiningFatigue);
if (MiningFatigue != nullptr)
{
int intensity = MiningFatigue->GetIntensity();
switch (intensity)
{
case 0: f *= 0.3f; break;
case 1: f *= 0.09f; break;
case 2: f *= 0.0027f; break;
default: f *= 0.00081f; break;
case 0: MiningSpeed *= 0.3f; break;
case 1: MiningSpeed *= 0.09f; break;
case 2: MiningSpeed *= 0.0027f; break;
default: MiningSpeed *= 0.00081f; break;
}
}
// 5x speed loss for being in water
if (IsInsideWater() && !(GetEquippedItem().m_Enchantments.GetLevel(cEnchantments::eEnchantment::enchAquaAffinity) > 0))
{
f /= 5.0f;
MiningSpeed /= 5.0f;
}
// 5x speed loss for not touching ground
if (!IsOnGround())
{
f /= 5.0f;
MiningSpeed /= 5.0f;
}
return f;
return MiningSpeed;
}
float cPlayer::GetPlayerRelativeBlockHardness(BLOCKTYPE a_Block)
float cPlayer::GetMiningProgressPerTick(BLOCKTYPE a_Block)
{
float blockHardness = cBlockInfo::GetHardness(a_Block);
float digSpeed = GetDigSpeed(a_Block);
float canHarvestBlockDivisor = GetEquippedItem().GetHandler()->CanHarvestBlock(a_Block) ? 30.0f : 100.0f;
// LOGD("blockHardness: %f, digSpeed: %f, canHarvestBlockDivisor: %f\n", blockHardness, digSpeed, canHarvestBlockDivisor);
return (blockHardness < 0) ? 0 : ((digSpeed / blockHardness) / canHarvestBlockDivisor);
// Based on https://minecraft.gamepedia.com/Breaking#Calculation
// If we know it's instantly breakable then quit here:
if (cBlockInfo::IsOneHitDig(a_Block))
{
return 1;
}
float BlockHardness = cBlockInfo::GetHardness(a_Block);
ASSERT(BlockHardness > 0); // Can't divide by 0 or less, IsOneHitDig should have returned true
if (GetEquippedItem().GetHandler()->CanHarvestBlock(a_Block))
{
BlockHardness*=1.5;
}
else
{
BlockHardness*=5;
}
float DigSpeed = GetDigSpeed(a_Block);
// LOGD("Time to mine block = %f", BlockHardness/DigSpeed);
// Number of ticks to mine = (20 * BlockHardness)/DigSpeed;
// Therefore take inverse to get fraction mined per tick:
return DigSpeed / (20 * BlockHardness);
}
bool cPlayer::CanInstantlyMine(BLOCKTYPE a_Block)
{
// Based on: https://minecraft.gamepedia.com/Breaking#Calculation
// Check it has non-zero hardness
if (cBlockInfo::IsOneHitDig(a_Block))
{
return true;
}
// If the dig speed is greater than 30 times the hardness, then the wiki says we can instantly mine
return GetDigSpeed(a_Block) > 30 * cBlockInfo::GetHardness(a_Block);
}

21
src/Entities/Player.h
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@ -597,11 +597,17 @@ public:
The player removes its m_ClientHandle ownership so that the ClientHandle gets deleted. */
void RemoveClientHandle(void);
/** Returns the relative block hardness for the block a_Block.
The bigger it is the faster the player can break the block.
Returns zero if the block is instant breakable.
Otherwise it returns the dig speed (float GetDigSpeed(BLOCKTYPE a_Block)) divided by the block hardness (cBlockInfo::GetHardness(BLOCKTYPE a_Block)) divided by 30 if the player can harvest the block and divided by 100 if he can't. */
float GetPlayerRelativeBlockHardness(BLOCKTYPE a_Block);
/** Returns the progress mined per tick for the block a_Block as a fraction
(1 would be completely mined)
Depends on hardness values so check those are correct.
Source: https://minecraft.gamepedia.com/Breaking#Calculation */
float GetMiningProgressPerTick(BLOCKTYPE a_Block);
/** Given tool, enchantments, status effects, and world position
returns whether a_Block would be instantly mined.
Depends on hardness values so check those are correct.
Source: https://minecraft.gamepedia.com/Breaking#Instant_breaking */
bool CanInstantlyMine(BLOCKTYPE a_Block);
/** get player explosion exposure rate */
virtual float GetExplosionExposureRate(Vector3d a_ExplosionPosition, float a_ExlosionPower) override;
@ -805,8 +811,9 @@ private:
Returns one if using hand.
If the player is using a tool that is good to break the block the value is higher.
If he has an enchanted tool with efficiency or he has a haste or mining fatique effect it gets multiplied by a specific factor depending on the strength of the effect or enchantment.
In he is in water it gets divided by 5 except his tool is enchanted with aqa affinity.
If he is not on ground it also gets divided by 5. */
In he is in water it gets divided by 5 except if his tool is enchanted with aqua affinity.
If he is not on ground it also gets divided by 5.
Source: https://minecraft.gamepedia.com/Breaking#Calculation */
float GetDigSpeed(BLOCKTYPE a_Block);
/** Add the recipe Id to the known recipes.