diff options
Diffstat (limited to 'packages/contracts/src/2.0.0/protocol')
9 files changed, 198 insertions, 77 deletions
diff --git a/packages/contracts/src/2.0.0/protocol/AssetProxy/ERC20Proxy.sol b/packages/contracts/src/2.0.0/protocol/AssetProxy/ERC20Proxy.sol index 004c3892d..258443bca 100644 --- a/packages/contracts/src/2.0.0/protocol/AssetProxy/ERC20Proxy.sol +++ b/packages/contracts/src/2.0.0/protocol/AssetProxy/ERC20Proxy.sol @@ -18,7 +18,6 @@ pragma solidity 0.4.24; -import "../../utils/LibBytes/LibBytes.sol"; import "./MixinAuthorizable.sol"; @@ -59,15 +58,64 @@ contract ERC20Proxy is mstore(96, 0) revert(0, 100) } - - /////// Token contract address /////// - // The token address is found as follows: - // * It is stored at offset 4 in `assetData` contents. - // * This is stored at offset 32 from `assetData`. - // * The offset to `assetData` from Params is stored at offset - // 4 in calldata. - // * The offset of Params in calldata is 4. - // So we read location 4 and add 32 + 4 + 4 to it. + + // `transferFrom`. + // The function is marked `external`, so no abi decodeding is done for + // us. Instead, we expect the `calldata` memory to contain the + // following: + // + // | Area | Offset | Length | Contents | + // |----------|--------|---------|-------------------------------------| + // | Header | 0 | 4 | function selector | + // | Params | | 4 * 32 | function parameters: | + // | | 4 | | 1. offset to assetData (*) | + // | | 36 | | 2. from | + // | | 68 | | 3. to | + // | | 100 | | 4. amount | + // | Data | | | assetData: | + // | | 132 | 32 | assetData Length | + // | | 164 | ** | assetData Contents | + // + // (*): offset is computed from start of function parameters, so offset + // by an additional 4 bytes in the calldata. + // + // (**): see table below to compute length of assetData Contents + // + // WARNING: The ABIv2 specification allows additional padding between + // the Params and Data section. This will result in a larger + // offset to assetData. + + // Asset data itself is encoded as follows: + // + // | Area | Offset | Length | Contents | + // |----------|--------|---------|-------------------------------------| + // | Header | 0 | 4 | function selector | + // | Params | | 1 * 32 | function parameters: | + // | | 4 | 12 + 20 | 1. token address | + + // We construct calldata for the `token.transferFrom` ABI. + // The layout of this calldata is in the table below. + // + // | Area | Offset | Length | Contents | + // |----------|--------|---------|-------------------------------------| + // | Header | 0 | 4 | function selector | + // | Params | | 3 * 32 | function parameters: | + // | | 4 | | 1. from | + // | | 36 | | 2. to | + // | | 68 | | 3. amount | + + /////// Read token address from calldata /////// + // * The token address is stored in `assetData`. + // + // * The "offset to assetData" is stored at offset 4 in the calldata (table 1). + // [assetDataOffsetFromParams = calldataload(4)] + // + // * Notes that the "offset to assetData" is relative to the "Params" area of calldata; + // add 4 bytes to account for the length of the "Header" area (table 1). + // [assetDataOffsetFromHeader = assetDataOffsetFromParams + 4] + // + // * The "token address" is offset 32+4=36 bytes into "assetData" (tables 1 & 2). + // [tokenOffset = assetDataOffsetFromHeader + 36 = calldataload(4) + 4 + 36] let token := calldataload(add(calldataload(4), 40)) /////// Setup Header Area /////// diff --git a/packages/contracts/src/2.0.0/protocol/AssetProxy/ERC721Proxy.sol b/packages/contracts/src/2.0.0/protocol/AssetProxy/ERC721Proxy.sol index 9d0bc0f74..65b664b8b 100644 --- a/packages/contracts/src/2.0.0/protocol/AssetProxy/ERC721Proxy.sol +++ b/packages/contracts/src/2.0.0/protocol/AssetProxy/ERC721Proxy.sol @@ -18,7 +18,6 @@ pragma solidity 0.4.24; -import "../../utils/LibBytes/LibBytes.sol"; import "./MixinAuthorizable.sol"; @@ -80,6 +79,8 @@ contract ERC721Proxy is // (*): offset is computed from start of function parameters, so offset // by an additional 4 bytes in the calldata. // + // (**): see table below to compute length of assetData Contents + // // WARNING: The ABIv2 specification allows additional padding between // the Params and Data section. This will result in a larger // offset to assetData. diff --git a/packages/contracts/src/2.0.0/protocol/AssetProxyOwner/AssetProxyOwner.sol b/packages/contracts/src/2.0.0/protocol/AssetProxyOwner/AssetProxyOwner.sol index 8b7333646..4d00e92d3 100644 --- a/packages/contracts/src/2.0.0/protocol/AssetProxyOwner/AssetProxyOwner.sol +++ b/packages/contracts/src/2.0.0/protocol/AssetProxyOwner/AssetProxyOwner.sol @@ -16,15 +16,18 @@ */ -pragma solidity 0.4.10; +pragma solidity 0.4.24; import "../../multisig/MultiSigWalletWithTimeLock.sol"; +import "../../utils/LibBytes/LibBytes.sol"; contract AssetProxyOwner is MultiSigWalletWithTimeLock { + using LibBytes for bytes; + event AssetProxyRegistration(address assetProxyContract, bool isRegistered); // Mapping of AssetProxy contract address => @@ -37,8 +40,14 @@ contract AssetProxyOwner is /// on an approved AssetProxy contract. modifier validRemoveAuthorizedAddressAtIndexTx(uint256 transactionId) { Transaction storage tx = transactions[transactionId]; - require(isAssetProxyRegistered[tx.destination]); - require(readBytes4(tx.data, 0) == REMOVE_AUTHORIZED_ADDRESS_AT_INDEX_SELECTOR); + require( + isAssetProxyRegistered[tx.destination], + "UNREGISTERED_ASSET_PROXY" + ); + require( + tx.data.readBytes4(0) == REMOVE_AUTHORIZED_ADDRESS_AT_INDEX_SELECTOR, + "INVALID_FUNCTION_SELECTOR" + ); _; } @@ -48,7 +57,7 @@ contract AssetProxyOwner is /// @param _assetProxyContracts Array of AssetProxy contract addresses. /// @param _required Number of required confirmations. /// @param _secondsTimeLocked Duration needed after a transaction is confirmed and before it becomes executable, in seconds. - function AssetProxyOwner( + constructor ( address[] memory _owners, address[] memory _assetProxyContracts, uint256 _required, @@ -59,7 +68,10 @@ contract AssetProxyOwner is { for (uint256 i = 0; i < _assetProxyContracts.length; i++) { address assetProxy = _assetProxyContracts[i]; - require(assetProxy != address(0)); + require( + assetProxy != address(0), + "INVALID_ASSET_PROXY" + ); isAssetProxyRegistered[assetProxy] = true; } } @@ -74,7 +86,7 @@ contract AssetProxyOwner is notNull(assetProxyContract) { isAssetProxyRegistered[assetProxyContract] = isRegistered; - AssetProxyRegistration(assetProxyContract, isRegistered); + emit AssetProxyRegistration(assetProxyContract, isRegistered); } /// @dev Allows execution of `removeAuthorizedAddressAtIndex` without time lock. @@ -89,31 +101,10 @@ contract AssetProxyOwner is tx.executed = true; // solhint-disable-next-line avoid-call-value if (tx.destination.call.value(tx.value)(tx.data)) - Execution(transactionId); + emit Execution(transactionId); else { - ExecutionFailure(transactionId); + emit ExecutionFailure(transactionId); tx.executed = false; } } - - /// @dev Reads an unpadded bytes4 value from a position in a byte array. - /// @param b Byte array containing a bytes4 value. - /// @param index Index in byte array of bytes4 value. - /// @return bytes4 value from byte array. - function readBytes4( - bytes memory b, - uint256 index - ) - internal - returns (bytes4 result) - { - require(b.length >= index + 4); - assembly { - result := mload(add(b, 32)) - // Solidity does not require us to clean the trailing bytes. - // We do it anyway - result := and(result, 0xFFFFFFFF00000000000000000000000000000000000000000000000000000000) - } - return result; - } } diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/MixinAssetProxyDispatcher.sol b/packages/contracts/src/2.0.0/protocol/Exchange/MixinAssetProxyDispatcher.sol index 80475e6e3..e90b62f19 100644 --- a/packages/contracts/src/2.0.0/protocol/Exchange/MixinAssetProxyDispatcher.sol +++ b/packages/contracts/src/2.0.0/protocol/Exchange/MixinAssetProxyDispatcher.sol @@ -19,7 +19,6 @@ pragma solidity 0.4.24; import "../../utils/Ownable/Ownable.sol"; -import "../../utils/LibBytes/LibBytes.sol"; import "./mixins/MAssetProxyDispatcher.sol"; import "../AssetProxy/interfaces/IAssetProxy.sol"; @@ -28,7 +27,6 @@ contract MixinAssetProxyDispatcher is Ownable, MAssetProxyDispatcher { - using LibBytes for bytes; // Mapping from Asset Proxy Id's to their respective Asset Proxy mapping (bytes4 => IAssetProxy) public assetProxies; @@ -90,7 +88,7 @@ contract MixinAssetProxyDispatcher is "LENGTH_GREATER_THAN_3_REQUIRED" ); - // Lookup assetProxy + // Lookup assetProxy. We do not use `LibBytes.readBytes4` for gas efficiency reasons. bytes4 assetProxyId; assembly { assetProxyId := and(mload( diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/MixinExchangeCore.sol b/packages/contracts/src/2.0.0/protocol/Exchange/MixinExchangeCore.sol index be163ec97..11bbe40fb 100644 --- a/packages/contracts/src/2.0.0/protocol/Exchange/MixinExchangeCore.sol +++ b/packages/contracts/src/2.0.0/protocol/Exchange/MixinExchangeCore.sol @@ -107,14 +107,7 @@ contract MixinExchangeCore is public nonReentrant { - // Fetch current order status - OrderInfo memory orderInfo = getOrderInfo(order); - - // Validate context - assertValidCancel(order, orderInfo); - - // Perform cancel - updateCancelledState(order, orderInfo.orderHash); + cancelOrderInternal(order); } /// @dev Gets information about an order: status, hash, and amount filled. @@ -236,6 +229,22 @@ contract MixinExchangeCore is return fillResults; } + /// @dev After calling, the order can not be filled anymore. + /// Throws if order is invalid or sender does not have permission to cancel. + /// @param order Order to cancel. Order must be OrderStatus.FILLABLE. + function cancelOrderInternal(Order memory order) + internal + { + // Fetch current order status + OrderInfo memory orderInfo = getOrderInfo(order); + + // Validate context + assertValidCancel(order, orderInfo); + + // Perform cancel + updateCancelledState(order, orderInfo.orderHash); + } + /// @dev Updates state with results of a fill order. /// @param order that was filled. /// @param takerAddress Address of taker who filled the order. @@ -404,16 +413,6 @@ contract MixinExchangeCore is safeMul(order.makerAssetAmount, takerAssetFilledAmount), "INVALID_FILL_PRICE" ); - - // Validate fill order rounding - require( - !isRoundingErrorFloor( - takerAssetFilledAmount, - order.takerAssetAmount, - order.makerAssetAmount - ), - "ROUNDING_ERROR" - ); } /// @dev Validates context for cancelOrder. Succeeds or throws. @@ -463,17 +462,17 @@ contract MixinExchangeCore is { // Compute proportional transfer amounts fillResults.takerAssetFilledAmount = takerAssetFilledAmount; - fillResults.makerAssetFilledAmount = getPartialAmountFloor( + fillResults.makerAssetFilledAmount = safeGetPartialAmountFloor( takerAssetFilledAmount, order.takerAssetAmount, order.makerAssetAmount ); - fillResults.makerFeePaid = getPartialAmountFloor( - takerAssetFilledAmount, - order.takerAssetAmount, + fillResults.makerFeePaid = safeGetPartialAmountFloor( + fillResults.makerAssetFilledAmount, + order.makerAssetAmount, order.makerFee ); - fillResults.takerFeePaid = getPartialAmountFloor( + fillResults.takerFeePaid = safeGetPartialAmountFloor( takerAssetFilledAmount, order.takerAssetAmount, order.takerFee diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/MixinMatchOrders.sol b/packages/contracts/src/2.0.0/protocol/Exchange/MixinMatchOrders.sol index 075a610b5..b4f6bdb26 100644 --- a/packages/contracts/src/2.0.0/protocol/Exchange/MixinMatchOrders.sol +++ b/packages/contracts/src/2.0.0/protocol/Exchange/MixinMatchOrders.sol @@ -177,13 +177,13 @@ contract MixinMatchOrders is { // Derive maker asset amounts for left & right orders, given store taker assert amounts uint256 leftTakerAssetAmountRemaining = safeSub(leftOrder.takerAssetAmount, leftOrderTakerAssetFilledAmount); - uint256 leftMakerAssetAmountRemaining = getPartialAmountFloor( + uint256 leftMakerAssetAmountRemaining = safeGetPartialAmountFloor( leftOrder.makerAssetAmount, leftOrder.takerAssetAmount, leftTakerAssetAmountRemaining ); uint256 rightTakerAssetAmountRemaining = safeSub(rightOrder.takerAssetAmount, rightOrderTakerAssetFilledAmount); - uint256 rightMakerAssetAmountRemaining = getPartialAmountFloor( + uint256 rightMakerAssetAmountRemaining = safeGetPartialAmountFloor( rightOrder.makerAssetAmount, rightOrder.takerAssetAmount, rightTakerAssetAmountRemaining @@ -205,7 +205,7 @@ contract MixinMatchOrders is matchedFillResults.left.takerAssetFilledAmount = matchedFillResults.right.makerAssetFilledAmount; // Round down to ensure the maker's exchange rate does not exceed the price specified by the order. // We favor the maker when the exchange rate must be rounded. - matchedFillResults.left.makerAssetFilledAmount = getPartialAmountFloor( + matchedFillResults.left.makerAssetFilledAmount = safeGetPartialAmountFloor( leftOrder.makerAssetAmount, leftOrder.takerAssetAmount, matchedFillResults.left.takerAssetFilledAmount @@ -217,7 +217,7 @@ contract MixinMatchOrders is matchedFillResults.right.makerAssetFilledAmount = matchedFillResults.left.takerAssetFilledAmount; // Round up to ensure the maker's exchange rate does not exceed the price specified by the order. // We favor the maker when the exchange rate must be rounded. - matchedFillResults.right.takerAssetFilledAmount = getPartialAmountCeil( + matchedFillResults.right.takerAssetFilledAmount = safeGetPartialAmountCeil( rightOrder.takerAssetAmount, rightOrder.makerAssetAmount, matchedFillResults.right.makerAssetFilledAmount @@ -231,24 +231,24 @@ contract MixinMatchOrders is ); // Compute fees for left order - matchedFillResults.left.makerFeePaid = getPartialAmountFloor( + matchedFillResults.left.makerFeePaid = safeGetPartialAmountFloor( matchedFillResults.left.makerAssetFilledAmount, leftOrder.makerAssetAmount, leftOrder.makerFee ); - matchedFillResults.left.takerFeePaid = getPartialAmountFloor( + matchedFillResults.left.takerFeePaid = safeGetPartialAmountFloor( matchedFillResults.left.takerAssetFilledAmount, leftOrder.takerAssetAmount, leftOrder.takerFee ); // Compute fees for right order - matchedFillResults.right.makerFeePaid = getPartialAmountFloor( + matchedFillResults.right.makerFeePaid = safeGetPartialAmountFloor( matchedFillResults.right.makerAssetFilledAmount, rightOrder.makerAssetAmount, rightOrder.makerFee ); - matchedFillResults.right.takerFeePaid = getPartialAmountFloor( + matchedFillResults.right.takerFeePaid = safeGetPartialAmountFloor( matchedFillResults.right.takerAssetFilledAmount, rightOrder.takerAssetAmount, rightOrder.takerFee diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/MixinWrapperFunctions.sol b/packages/contracts/src/2.0.0/protocol/Exchange/MixinWrapperFunctions.sol index a5459a21e..a149f95c9 100644 --- a/packages/contracts/src/2.0.0/protocol/Exchange/MixinWrapperFunctions.sol +++ b/packages/contracts/src/2.0.0/protocol/Exchange/MixinWrapperFunctions.sol @@ -377,10 +377,11 @@ contract MixinWrapperFunctions is /// @param orders Array of order specifications. function batchCancelOrders(LibOrder.Order[] memory orders) public + nonReentrant { uint256 ordersLength = orders.length; for (uint256 i = 0; i != ordersLength; i++) { - cancelOrder(orders[i]); + cancelOrderInternal(orders[i]); } } diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol b/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol index 0e0fba5d2..57fd53f29 100644 --- a/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol +++ b/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibMath.sol @@ -26,11 +26,48 @@ contract LibMath is { /// @dev Calculates partial value given a numerator and denominator rounded down. + /// Reverts if rounding error is >= 0.1% /// @param numerator Numerator. /// @param denominator Denominator. /// @param target Value to calculate partial of. /// @return Partial value of target rounded down. - function getPartialAmountFloor( + function safeGetPartialAmountFloor( + uint256 numerator, + uint256 denominator, + uint256 target + ) + internal + pure + returns (uint256 partialAmount) + { + require( + denominator > 0, + "DIVISION_BY_ZERO" + ); + + require( + !isRoundingErrorFloor( + numerator, + denominator, + target + ), + "ROUNDING_ERROR" + ); + + partialAmount = safeDiv( + safeMul(numerator, target), + denominator + ); + return partialAmount; + } + + /// @dev Calculates partial value given a numerator and denominator rounded down. + /// Reverts if rounding error is >= 0.1% + /// @param numerator Numerator. + /// @param denominator Denominator. + /// @param target Value to calculate partial of. + /// @return Partial value of target rounded up. + function safeGetPartialAmountCeil( uint256 numerator, uint256 denominator, uint256 target @@ -43,7 +80,48 @@ contract LibMath is denominator > 0, "DIVISION_BY_ZERO" ); + + require( + !isRoundingErrorCeil( + numerator, + denominator, + target + ), + "ROUNDING_ERROR" + ); + // safeDiv computes `floor(a / b)`. We use the identity (a, b integer): + // ceil(a / b) = floor((a + b - 1) / b) + // To implement `ceil(a / b)` using safeDiv. + partialAmount = safeDiv( + safeAdd( + safeMul(numerator, target), + safeSub(denominator, 1) + ), + denominator + ); + return partialAmount; + } + + /// @dev Calculates partial value given a numerator and denominator rounded down. + /// @param numerator Numerator. + /// @param denominator Denominator. + /// @param target Value to calculate partial of. + /// @return Partial value of target rounded down. + function getPartialAmountFloor( + uint256 numerator, + uint256 denominator, + uint256 target + ) + internal + pure + returns (uint256 partialAmount) + { + require( + denominator > 0, + "DIVISION_BY_ZERO" + ); + partialAmount = safeDiv( safeMul(numerator, target), denominator @@ -69,7 +147,7 @@ contract LibMath is denominator > 0, "DIVISION_BY_ZERO" ); - + // safeDiv computes `floor(a / b)`. We use the identity (a, b integer): // ceil(a / b) = floor((a + b - 1) / b) // To implement `ceil(a / b)` using safeDiv. diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/mixins/MExchangeCore.sol b/packages/contracts/src/2.0.0/protocol/Exchange/mixins/MExchangeCore.sol index d85913e0f..742499568 100644 --- a/packages/contracts/src/2.0.0/protocol/Exchange/mixins/MExchangeCore.sol +++ b/packages/contracts/src/2.0.0/protocol/Exchange/mixins/MExchangeCore.sol @@ -72,6 +72,11 @@ contract MExchangeCore is internal returns (LibFillResults.FillResults memory fillResults); + /// @dev After calling, the order can not be filled anymore. + /// @param order Order struct containing order specifications. + function cancelOrderInternal(LibOrder.Order memory order) + internal; + /// @dev Updates state with results of a fill order. /// @param order that was filled. /// @param takerAddress Address of taker who filled the order. |