A full decompilation and automatic security analysis of all contracts on the Ethereum and the Fantom blockchains. Updated hourly with new contracts uploaded to both networks. Analysis results by Dedaub.

Contract Library for the Ethereum and Fantom blockchains by Dedaub

cage

deny

exit

_msgSender

join

live

rely

wards

// hevm: flattened sources of src/join-5-auth.sol
pragma solidity >=0.5.12 >=0.6.7 <0.7.0;

////// lib/dss/src/lib.sol
// SPDX-License-Identifier: AGPL-3.0-or-later

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

/* pragma solidity >=0.5.12; */

contract LibNote {
    event LogNote(
        bytes4   indexed  sig,
        address  indexed  usr,
        bytes32  indexed  arg1,
        bytes32  indexed  arg2,
        bytes             data
    ) anonymous;

    modifier note {
        _;
        assembly {
            // log an 'anonymous' event with a constant 6 words of calldata
            // and four indexed topics: selector, caller, arg1 and arg2
            let mark := msize()                       // end of memory ensures zero
            mstore(0x40, add(mark, 288))              // update free memory pointer
            mstore(mark, 0x20)                        // bytes type data offset
            mstore(add(mark, 0x20), 224)              // bytes size (padded)
            calldatacopy(add(mark, 0x40), 0, 224)     // bytes payload
            log4(mark, 288,                           // calldata
                 shl(224, shr(224, calldataload(0))), // msg.sig
                 caller(),                            // msg.sender
                 calldataload(4),                     // arg1
                 calldataload(36)                     // arg2
                )
        }
    }
}

////// src/join-5-auth.sol
// SPDX-License-Identifier: AGPL-3.0-or-later

/// join-5-auth.sol -- Non-standard token adapters

// Copyright (C) 2018 Rain <[email protected]>
// Copyright (C) 2018-2020 Maker Ecosystem Growth Holdings, INC.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

/* pragma solidity ^0.6.7; */

/*import "lib.sol"; */

interface VatLike_4 {
    function slip(bytes32, address, int256) external;
}

interface GemLike_2 {
    function decimals() external view returns (uint8);
    function transfer(address, uint256) external returns (bool);
    function transferFrom(address, address, uint256) external returns (bool);
}

// Authed GemJoin for a token that has a lower precision than 18 and it has decimals (like USDC)

contract AuthGemJoin5 is LibNote {
    // --- Auth ---
    mapping (address => uint256) public wards;
    function rely(address usr) external note auth { wards[usr] = 1; }
    function deny(address usr) external note auth { wards[usr] = 0; }
    modifier auth { require(wards[msg.sender] == 1); _; }

    VatLike_4 public vat;
    bytes32 public ilk;
    GemLike_2 public gem;
    uint256 public dec;
    uint256 public live;  // Access Flag

    constructor(address vat_, bytes32 ilk_, address gem_) public {
        gem = GemLike_2(gem_);
        dec = gem.decimals();
        require(dec < 18, "GemJoin5/decimals-18-or-higher");
        wards[msg.sender] = 1;
        live = 1;
        vat = VatLike_4(vat_);
        ilk = ilk_;
    }

    function cage() external note auth {
        live = 0;
    }

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x, "GemJoin5/overflow");
    }

    function join(address urn, uint256 wad, address _msgSender) external note auth {
        require(live == 1, "GemJoin5/not-live");
        uint256 wad18 = mul(wad, 10 ** (18 - dec));
        require(int256(wad18) >= 0, "GemJoin5/overflow");
        vat.slip(ilk, urn, int256(wad18));
        require(gem.transferFrom(_msgSender, address(this), wad), "GemJoin5/failed-transfer");
    }

    function exit(address guy, uint256 wad) external note {
        uint256 wad18 = mul(wad, 10 ** (18 - dec));
        require(int256(wad18) >= 0, "GemJoin5/overflow");
        vat.slip(ilk, msg.sender, -int256(wad18));
        require(gem.transfer(guy, wad), "GemJoin5/failed-transfer");
    }
}

contract.sol

__ANONYMOUS__