Questions tagged [delegatecall]
https://docs.soliditylang.org/en/v0.8.12/introduction-to-smart-contracts.html?highlight=delegatecall#delegatecall-callcode-and-libraries
186
questions
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0
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14
views
How to decode DSProxy input data
I'm trying to debug a tx made through a DSProxy deployed on Polygonscan, but I'm having a difficult time since the _data part of the DSProxy function input is ABI-encoded. I would have to comb through ...
- 2,980
0
votes
1
answer
17
views
testing in hardhat delegatecall returns invalid values
I'm trying to test if the delegatecall works fine, but I got an unwanted result.
contract CallerContract{
uint256 public value;
address public sender;
string public name;
...
- 103
0
votes
1
answer
15
views
Propose delegatecall via the safe-apps-sdk
Is the safe-apps-sdk only meant to be used when we don't need to propose a delegatecall to the safe?
It seems that the safe-apps-sdk uses MultiSendCallOnly.sol.
Is it possible to customize the ...
- 1
0
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0
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15
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How to delegate call from one contract to another contract in different blockchain
My proxy contract and implementation contract are in different blockchains. Can i use delegate call?
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1
answer
34
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How to use the factory pattern when the child is ownable?
I'm trying to reason how a factory can make calls to a child contract that is owned by an EOA.
The goal of this project is to make a StoreFactory contract that allows anyone to deploy their own Store ...
- 13
1
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0
answers
13
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UUPS upgradeable contract call fails with delegatecall error when calling newly added functions
I created an upgradeable contract adhering to the UUPS standard following this guide here. I then added some new functions, deployed the upgrade using the upgrades plugin upgrades.prepareUpgrade() ...
- 282
2
votes
1
answer
63
views
Delegatecall not working
I have deployed the following smart contract: 0x016d87b8c98e6ad0991d128CddA435FAfbC06792
//SPDX-License-Identifier: MIT
pragma solidity 0.8.15;
contract Proxy {
uint256 public count;
address ...
- 721
1
vote
1
answer
35
views
Expected primary expression in byte casting
I have a contract (Implementation.sol) which delegatecalls the other contract (Attacker.sol) to selfdestruct. When I try to compile the Implementation.sol on Remix, I receive Expected primary ...
- 13
0
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0
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17
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EOA delegating call authority to a contract to interact with another contract
Actually, I want my contract (say A) to interact with a project's contract (say B).
But, contract B's author has restricted calls by any contract. So with this, only one option is left i.e. an EOA ...
- 131
0
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0
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10
views
Exception while processing transaction: reverted with reason string 'Address: low-level delegate call failed'
I have the following function inside my Registry.sol contract:
function createOrganizerProxy(bytes32 organizationName)
public
payable
returns (address)
{
require(!isTaken[...
0
votes
1
answer
34
views
How do I call delegatecall and how do I change it to use the following contract to call?
a is the contract that contains the delegate call, b is the calling contract,
I wonder if this B contract can be used for another contract also which contains delegate call?
In the end, I'm interested ...
- 31
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17
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How to call a function's Contract B from a contract address and not a personal EOA account?
I"m working on a proxy implementation and I already have a proxy contract with 2 setters to modify the implementation the proxy delegates the calls to.
setPendingImplementation
...
0
votes
2
answers
236
views
Fastest way to find the function in a contract from it's selector?
Let's say I have a function selector:
0xa9059cbb
And I have a contract as such:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
contract CallAnything {
function balanceOf(address ...
- 6,446
0
votes
0
answers
20
views
Does anyone know what is the purpose of "this;" at the end of the function [duplicate]
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
contract Delegate {
address public owner;
constructor(address _owner) public {
owner = _owner;
}
function pwn() public {
...
- 1
0
votes
1
answer
90
views
What exactly is each parameter for assembly delegatecall?
I've been searching everywhere but I'm still not clear what each of the parameters are for delegatecall. What I have found is this delegatecall(g, a, in, insize, out, outsize), where g is gas and a is ...
- 35
0
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1
answer
212
views
What is the difference between encodeWithSelector and encode?
I've been messing around with the abi.encode... functions and I think I have a good grasp of the differences, except abi.encode and abi.encodeWithSelector. Because, they give similar but slightly ...
- 35
1
vote
2
answers
133
views
Why is delegatecall calling the fallback function?
I made two simple contracts to test delegatecall on remix:
contract Delegate{
uint public x;
function add(uint a, uint b)public{
x = a + b;
}
fallback() external{
...
- 35
0
votes
1
answer
164
views
How do I pass a struct as an argument in delegatecall to a proxy library?
I am trying to call the buyAssetsForEth function in the OpenSeaMarketV2 library using delegatecall as follows:
pragma solidity 0.8.4;
contract Owned {
address public owner;
constructor(...
- 3
1
vote
1
answer
118
views
Is there a way to check if a call is a call or a delegatecall?
I want to add a modifier to one of my function that checks wether the function call is a call or a delegatecall?
Is there any way to figure that out? May be with some assembly?
- 56
0
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1
answer
210
views
delegate call from a fallback function using msg.data doesn't work
Please look into the following 3 contracts:
// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.7;
contract implementationProxy {
uint public a;
uint public b;
address owner;
...
0
votes
0
answers
15
views
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 ...
- 183
1
vote
1
answer
33
views
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.
- 11
0
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0
answers
33
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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 `...
- 11
0
votes
0
answers
10
views
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 ...
- 379
0
votes
1
answer
122
views
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
67
views
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 ...
- 379
2
votes
2
answers
657
views
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-...
- 21
0
votes
1
answer
11
views
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
70
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
1
vote
2
answers
695
views
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....
- 53
0
votes
1
answer
321
views
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
votes
1
answer
46
views
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 ...
- 136
1
vote
1
answer
264
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 ...
- 379
0
votes
1
answer
51
views
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
101
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 (...
0
votes
2
answers
48
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 : ...
- 11
0
votes
1
answer
482
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
0
votes
1
answer
261
views
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
288
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
vote
0
answers
75
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
0
votes
0
answers
35
views
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
0
votes
0
answers
73
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 [...
0
votes
0
answers
69
views
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
vote
0
answers
153
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
0
votes
0
answers
14
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 ...
- 1,285
0
votes
0
answers
33
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 ...
- 233
0
votes
0
answers
126
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,...
- 233
0
votes
1
answer
246
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
...
- 233
1
vote
1
answer
261
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 = ...
- 321
3
votes
1
answer
153
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 ...
- 35