Questions tagged [delegatecall]
https://docs.soliditylang.org/en/v0.8.12/introduction-to-smart-contracts.html?highlight=delegatecall#delegatecall-callcode-and-libraries
168
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6
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Why this delegatecall -> call tx is not completing?
I wish I had a better title for this but I simply do not know what is going on. The function simply stops during _mint function at _balances[account] = oldAccountBalance.add(amount);
My goal is to ...
- 163
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7
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How can i foward funds swaped from 0x api quotes in the same transaction
ideally i will like to add more logic (like fowarding funds or fees) to the quote.data before letting a user send the transaction to the blockchain.
- 1
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15
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0x fillQuote fails on mainnet fork. i am sending a delegate call (i want to save transaction context) to the 0x proxy contract but transactions fail
function fillQuote(
// The `sellTokenAddress` field from the API response.
IERC20 sellToken,
// The `buyTokenAddress` field from the API response.
IERC20 buyToken,
// The `...
- 1
0
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0
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5
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Changing msg.value
Is there any way to change msg.value between calls (or delegatecalls)?
For example:
A --delegatecalls(msg.value=0)--> B -->delegatecall(msg.value=1) --> C
where some logic would happen in B ...
- 265
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1
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33
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fallback not executing
I have a test project with proxy pattern (fallback/delegate call). The purpose is to have upgradeable contracts.
Here is the proxy contract:
// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;
...
- 105
1
vote
1
answer
25
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Assembly vs solidity delegatecall
Is there a real difference nowadays, performance-wise, between using assembly delegatecall and the high-level solidity version?
I know that in the past assembly was used so you could get the returned ...
- 265
1
vote
2
answers
59
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Can ERC-20 token transfers have re-entrancy?
I understand that re-entrance attack can happened when you send ETH, because of fallback() function. But in ERC20 transfer there is no call for fallback, so I wonder if there's a way to make re-...
- 11
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1
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9
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Delegatecall reverting after adding a second argument
solidity 0.8.3;
I am trying to implement delegatecall, and I created a simple test within my contracts.
function f(uint256 _testInt) public view returns(uint256 test) {
test = _testInt + 1;
...
- 3
1
vote
1
answer
27
views
Contract A delegatecall function in contract B which calls function in contract c. msg.sender for function in contract c?
If Function in contract A delegatecall function in contract B which calls function in contract C. What will be the msg.sender for function in contract C?
- 11
0
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2
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79
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How to use Proxies in Ethers?
I'm trying to use Proxies in Ethers.
My Solidity file:
//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy....
- 33
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1
answer
61
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delegateCall in Solidity understanding case
pragma solidity ^0.8.10;
/*
HackMe is a contract that uses delegatecall to execute code.
It it is not obvious that the owner of HackMe can be changed since there is no
function inside HackMe to do so....
- 3
0
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1
answer
22
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Events in Chained Fallback Function Cause VirtualMachineError
I’m working on an upgradeable contract that uses fallback functions with inline assembly delegatecall and call calls (using calldatacopy and returndatacopy) to route internal and external function ...
- 101
0
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1
answer
48
views
Delegatecall failing
I have this second-layer delegatecall (delegatecall on a contract that already did delegatecall) that continues to fail even after checking all the main reasons why it could fail (storage layout, uint ...
- 265
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1
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17
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How do you manipulate a storage struct array with an external library function?
Basic pseudocode mockup of my problem
import libraryB;
contract A{
struct Person{
string Name;
uint age;
}
Person[] public Party;
Party[0] = (Alice, 30);
libraryB.addAgeToPerson(Party[0], 1)
}
...
0
votes
1
answer
47
views
solidity delegatecall Error return value
function queryErc20BaseInfo(address a) public view returns(bool success, bytes memory list )
{
(success , list) = address(a).staticcall(abi.encodeWithSignature("name()"));
return (...
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2
answers
34
views
Wrong address rertun when I call ownerof with delegatecall
I am trying to call the function "ownerof" of a contract but it return me something like that : ...
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1
answer
124
views
Set data for call(), delegatecall(), etc, in Yul / inline assembly?
It seems that almost all the examples of external calls are simple proxies, which do something like this:
assembly {
// Copy msg.data. We take full control of memory in this inline ...
- 23
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votes
1
answer
41
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how to use the value of msg.value and msg.sender of a contract, when a function calls a different contract
I'm studing Solidity and tring to understand how it works.
Starting from Safe Remote Purchase in the "Solidity section by example" the doc (https://docs.soliditylang.org/en/v0.8.12/solidity-...
- 3
2
votes
1
answer
99
views
Chain of delegatecall and call
Situation is: A calling B delegate calling C calling D
What would be the msg.sender in D?
I performed some test in Remix and it looks like msg.sender in D is C's address. I don't get why it's not A's ...
- 23
1
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0
answers
39
views
How to manually generate calldata
Here's my code snippet:
function getCalldata(string calldata _func, string calldata _param1, uint256 _param2) public pure returns (bytes memory) {
return abi.encodeWithSignature(_func, _param1,...
- 11
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0
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16
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delegatecall, but with modifying the Caller contract state?
Example: EOA -> Caller Contract -> Target Contract
As far as I can tell, delegatecall differs from normal calls in two very important ways:
Call context is preserved, msg.value and msg.sender ...
- 23
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0
answers
43
views
How to debug smart contract delegatecall?
I am building an app that requires contact A to interact with a remote contract B. I am using solidity delegatecall function. After running it, I am seeing "Although one or more Error Occurred [...
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35
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How to instantiate functions of other smart contracts to write and read data from the same contract on Solidity?
I'm trying to understand inheritance, interfaces and the call of functions from other smart contracts in Solidity. So I did this example; there is a MyInterface interface in which is declare a struct ...
- 1
1
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0
answers
54
views
Best practice for calling function from another contract
I'm a bit of a beginner so I'm sorry if I misphrase anything, but I haven't been able to find a definitive answer on this yet. I'm going through some tutorials which list out a few ways to call ...
- 13
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0
answers
9
views
Exception disorder with or without nesting
I can’t understand following text:
for a chain of nested calls (or delegatecalls) originated from a root
call (or delegatecall), if the root call doesn’t throw exception while
at least one of its ...
- 1,195
0
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0
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17
views
delegatecall not setting the variable in the contract
I'm making a delegatecall like so:
(bool success, bytes memory result) = target.delegatecall(msg.data);
to initialize:
function initialize(
address creator,
PartyInfo memory ...
- 193
0
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0
answers
56
views
delegatecall failing without a good reason
I'm calling a Proxy contract like so from contract A:
(bool success, bytes memory result) = partyClone.call(abi.encodeWithSignature(
"initialize(address,PartyInfo,address,...
- 193
0
votes
1
answer
142
views
TypeError: Member "initialize" not found or not visible after argument-dependent lookup in contract PartyRegistry
I'm calling a contract like so:
PartyRegistry(partyClone).initialize(
msg.sender,
partyInfo,
stableCoin,
initialDeposit,
PLATFORM_ADDRESS
...
- 193
1
vote
1
answer
75
views
delegatecall approve of an ERC20 contract
I try to call approve from a contract of another ERC20 contract:
The delegate call:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
contract Delegate {
address public constant f24 = ...
- 189
2
votes
1
answer
79
views
delegatecall in Brownie
I am trying to perform delegatecall in Brownie solving the Delegation task in the Ethernaut app in order to claim ownership of the Delegate contract (see below).
What is the equivalent of the ...
- 25
0
votes
1
answer
93
views
How can I invoke the fallback method with sendTransaction?
I'm testing the delegatecall vulnerability. And I've created two contracts to do that.
WalletLibrary.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
contract MyWalletLibrary {
uint ...
- 147
0
votes
1
answer
62
views
State variable not updated after DelegateCall
I deployed two contracts 'WalletLibrary' and 'Wallet': most of the functions in Wallet delegateCall() the functions from WalletLibrary. I want to recreate an Attack, where I call the initWallet() ...
0
votes
1
answer
487
views
Why is there significant gas costs associated with call and delegate call?
I've been trying to understanding why Ethereum doesn't have a significant on chain package/library ecosystem despite having the capacity to do so via delegatecall or call to an ImplementationContract ...
- 180
1
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0
answers
106
views
DelegateCall returning false
I'm learning Solidity and tried to create a couple of contracts on Truffle.
For this, I have created a Shop.sol contract that can "Buy" items using an ERC20 token.
Inside the buyItem() ...
- 11
0
votes
2
answers
63
views
Reducing token transfers with a delegatecall
I am trying to solve a circular dependency in a "toy" app to test upgradable contracts.
I have a Treasury contract containing ERC20 tokens and an upgradable set of Action contracts.
The ...
- 113
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votes
1
answer
120
views
Why does this result in an infinite loop?
I am doing this exercise: https://ethernaut.openzeppelin.com/level/0x9451961b7Aea1Df57bc20CC68D72f662241b5493
I expect my contract to call a non existent method in Delegation which then calls the ...
- 135
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votes
1
answer
61
views
Is it possible to delegatecall a function that calls a private function?
I don't think this is possible but I would just like to make sure. An example would be the following?
pragma solidity ^0.4.0;
// SPDX-License-Identifier: Unlicensed
contract Victim{
ERC20 token;
...
0
votes
1
answer
76
views
How to use a library contract function inside my contract without inheriting
I have a library contract deployed on ropsten with address 0xc0b843678E1E73c090De725Ee1Af6a9F728E2C47 and code
// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;
library ...
- 121
0
votes
1
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48
views
Can I delegatecall my own internal function?
I have a contract that uses
address(this).delegatecall(...)
Can I put an internal function inside the delegatecall somehow?
I tried the normal way, public functions worked but internal didn't. Is ...
- 391
0
votes
0
answers
62
views
Proxying a contract with delegatecall and matching storage layout
I am looking to add some additional functionality to an existing deployed smart contract. The function I would like to call on the target contract requires that the msg.sender be the wallet, so simply ...
- 101
4
votes
1
answer
85
views
Does `delegatecall` create a new stack frame?
It seems like it was introduced to replace callcode because callcode modified msg.sender and msg.value, and that breaks a lot of use cases.
If the msg fields aren't changed, that leads us to think a ...
- 4,970
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46
views
delegatecall return wrong value
I want to get userInfo which is masterchef's methods.
But I want to call userInfo from another contract, so I'm using delegatecall
address sender = msg.sender;
(bool success, bytes memory result) = ...
0
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0
answers
56
views
What does "caller()" return in Yul when DELEGATECALL is used?
While browsing the Solidity docs, I noticed this instruction available in assembly:
caller(): call sender (excluding delegatecall)
What do the docs mean by "excluding delegatecall"? Is it ...
- 12k
0
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1
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192
views
Can I use delegatecall with the target contract's storage?
With a scenario that goes as follows: I want a Contract A that allows me to call functions from other contracts, different each time, using the storage and code of the target contract. Essentially, I ...
- 199
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0
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38
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Using delegatecall [duplicate]
I have a contract from which I want to do a delegatecall, which approvesForAll the contract A in contract B. I use delegatecall to keep the sender the one initiating the transaction.
function ...
- 27
1
vote
0
answers
194
views
Does a proxy contract need to declare state variables?
There is no variable declaration in the proxy contract. Does the returned data from the delegate call auto-generate the variables for the proxy contract?
contract Logic {
uint256 varA;
...
- 11
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votes
1
answer
368
views
How does Solidity decode a struct returned from a delegate call?
I have a proxy contract that delegate calls to a target contract. The proxy is similar to DSProxy.
In it, there is an execute function:
function execute(address target, bytes memory data) external ...
- 12k
1
vote
1
answer
48
views
How to alter the gas stipend with high-level delegate call?
When using the DELEGATECALL opcode via assembly, we can pass a specific amount of gas:
let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
But the high-level DELEGATECALL does ...
- 12k
1
vote
1
answer
131
views
Understanding why this blob of assembly code adds 0x20 and 0x1f [duplicate]
The execute function defined in MakerDAO's DSProxy contains this blob of assembly code:
assembly {
let succeeded := delegatecall(sub(gas, 5000), _target, add(_data, 0x20), mload(_data), 0, 0)
...
- 12k
1
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0
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123
views
Why is delegatecall returning 0 and erroring?
I'm working with OpenZeppelin upgradable proxies, as well as their governance. I have a propose function that looks like:
function propose(
address[] memory targets,
uint256[] memory ...
- 4,970