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Chore/updated relayer encoding fix #430

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a6fe48f
fix: update broken encoding
Aug 8, 2025
dabf0c2
fix: add from field
Aug 8, 2025
1a20744
feat: sender allowlist
Aug 8, 2025
698c1e8
chore: update interfaces
Aug 8, 2025
037aea1
chore: update tests for encode fix
Aug 11, 2025
9544a8d
chore: update gateways
Aug 11, 2025
7f77e5d
feat: allow all senders for gateway
Aug 11, 2025
96a56dc
chore: add helper functions
Aug 11, 2025
f1a4165
feat: global allow test
Aug 11, 2025
78efc27
chore: refactor for message encoding fix
Aug 11, 2025
6bf3b15
chore: add allowlist
Aug 11, 2025
eb9f428
chore: update tests for refactor
Aug 11, 2025
717e89e
fix: bot review fixes
Aug 11, 2025
7c7b750
fix: merkle node creation
Aug 11, 2025
9afd65c
chore: add from field
Aug 13, 2025
9bf7c9a
chore: update tests for added field
Aug 13, 2025
a16ccf9
fix: node hash decoding for msg sender
Aug 13, 2025
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18 changes: 4 additions & 14 deletions contracts/src/arbitrumToEth/VeaInboxArbToEth.sol
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: MIT

/// @custom:authors: [@jaybuidl, @shotaronowhere]
/// @custom:authors: [@jaybuidl, @mani99brar, @shotaronowhere]
/// @custom:reviewers: []
/// @custom:auditors: []
/// @custom:bounties: []
Expand Down Expand Up @@ -70,26 +70,16 @@ contract VeaInboxArbToEth is IVeaInbox {
/// Amortized cost is constant.
/// Note: See docs for details how inbox manages merkle tree state.
/// @param _to The address of the contract on the receiving chain which receives the calldata.
/// @param _fnSelector The function selector of the receiving contract.
/// @param _data The message calldata, abi.encode(param1, param2, ...)
/// @param _data The message calldata, abi.encodeWithSelector(fnSelector, param1, param2, ...)
/// @return msgId The zero based index of the message in the inbox.
function sendMessage(address _to, bytes4 _fnSelector, bytes memory _data) external override returns (uint64) {
function sendMessage(address _to, bytes calldata _data) external override returns (uint64) {
uint64 oldCount = count;

// Given arbitrum's speed limit of 7 million gas / second, it would take atleast 8 million years of full blocks to overflow.
// It *should* be impossible to overflow, but we check to be safe when appending to the tree.
require(oldCount < type(uint64).max, "Inbox is full.");

bytes memory nodeData = abi.encodePacked(
oldCount,
_to,
// _data is abi.encode(param1, param2, ...), we need to encode it again to get the correct leaf data
abi.encodePacked( // equivalent to abi.encodeWithSelector(fnSelector, msg.sender, param1, param2, ...)
_fnSelector,
bytes32(uint256(uint160(msg.sender))), // big endian padded encoding of msg.sender, simulating abi.encodeWithSelector
_data
)
);
bytes memory nodeData = abi.encodePacked(oldCount, _to, msg.sender, _data);

// single hashed leaf
bytes32 newInboxNode = keccak256(nodeData);
Expand Down
26 changes: 22 additions & 4 deletions contracts/src/arbitrumToEth/VeaOutboxArbToEth.sol
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: MIT

/// @custom:authors: [@jaybuidl, @shotaronowhere]
/// @custom:authors: [@jaybuidl, @mani99brar, @shotaronowhere]
/// @custom:reviewers: []
/// @custom:auditors: []
/// @custom:bounties: []
Expand Down Expand Up @@ -41,6 +41,7 @@ contract VeaOutboxArbToEth is IVeaOutboxOnL1 {

mapping(uint256 epoch => bytes32) public claimHashes; // epoch => claim
mapping(uint256 messageId => bytes32) internal relayed; // msgId/256 => packed replay bitmap, preferred over a simple boolean mapping to save 15k gas per message
mapping(address => mapping(address => bool)) public allowlist; // to => from => allowed, Enforces allowed sender addresses for a receiver contract. Address(0) allowing all senders.

uint256 public sequencerDelayLimit; // This is MaxTimeVariation.delaySeconds from the arbitrum sequencer inbox, it is the maximum seconds the sequencer can backdate L2 txns relative to the L1 clock.
SequencerDelayLimitDecreaseRequest public sequencerDelayLimitDecreaseRequest; // Decreasing the sequencerDelayLimit requires a delay to avoid griefing by sequencer, so we keep track of the request here.
Expand Down Expand Up @@ -351,15 +352,32 @@ contract VeaOutboxArbToEth is IVeaOutboxOnL1 {
emit Verified(_epoch);
}

/// @dev Sets the allowlist for the sender gateway.
/// Note: Address(0) is used to allow all addresses.
/// @param _from The address to allow or disallow
/// @param _allowed Whether to allow or disallow the address.
function setAllowlist(address _from, bool _allowed) external {
allowlist[msg.sender][_from] = _allowed;
}

/// @dev Verifies and relays the message. UNTRUSTED.
/// @param _proof The merkle proof to prove the message inclusion in the inbox state root.
/// @param _msgId The zero based index of the message in the inbox.
/// @param _to The address of the contract on Ethereum to call.
/// @param _message The message encoded in the vea inbox as abi.encodeWithSelector(fnSelector, msg.sender, param1, param2, ...)
function sendMessage(bytes32[] calldata _proof, uint64 _msgId, address _to, bytes calldata _message) external {
/// @param _from The address of the contract on Arbitrum that sent the message.
/// @param _message The message in the vea inbox as abi.encodeWithSelector(fnSelector, param1, param2, ...)
function sendMessage(
bytes32[] calldata _proof,
uint64 _msgId,
address _to,
address _from,
bytes calldata _message
) external {
require(_proof.length < 64, "Proof too long.");
bool isAllowed = allowlist[_to][_from] || allowlist[_to][address(0)];
require(isAllowed, "Message sender not allowed to call receiver.");

bytes32 nodeHash = keccak256(abi.encodePacked(_msgId, _to, _message));
bytes32 nodeHash = keccak256(abi.encodePacked(_msgId, _to, _from, _message));

// double hashed leaf
// avoids second order preimage attacks
Expand Down
18 changes: 4 additions & 14 deletions contracts/src/arbitrumToGnosis/VeaInboxArbToGnosis.sol
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@@ -1,6 +1,6 @@
// SPDX-License-Identifier: MIT

/// @custom:authors: [@jaybuidl, @shotaronowhere]
/// @custom:authors: [@jaybuidl, @mani99brar, @shotaronowhere]
/// @custom:reviewers: []
/// @custom:auditors: []
/// @custom:bounties: []
Expand Down Expand Up @@ -70,26 +70,16 @@ contract VeaInboxArbToGnosis is IVeaInbox {
/// Amortized cost is constant.
/// Note: See docs for details how inbox manages merkle tree state.
/// @param _to The address of the contract on the receiving chain which receives the calldata.
/// @param _fnSelector The function selector of the receiving contract.
/// @param _data The message calldata, abi.encode(param1, param2, ...)
/// @param _data The message calldata, abi.encodeWithSelector(fnSelector, param1, param2, ...)
/// @return msgId The zero based index of the message in the inbox.
function sendMessage(address _to, bytes4 _fnSelector, bytes memory _data) external override returns (uint64) {
function sendMessage(address _to, bytes calldata _data) external override returns (uint64) {
uint64 oldCount = count;

// Given arbitrum's speed limit of 7 million gas / second, it would take atleast 8 million years of full blocks to overflow.
// It *should* be impossible to overflow, but we check to be safe when appending to the tree.
require(oldCount < type(uint64).max, "Inbox is full.");

bytes memory nodeData = abi.encodePacked(
oldCount,
_to,
// _data is abi.encode(param1, param2, ...), we need to encode it again to get the correct leaf data
abi.encodePacked( // equivalent to abi.encodeWithSelector(fnSelector, msg.sender, param1, param2, ...)
_fnSelector,
bytes32(uint256(uint160(msg.sender))), // big endian padded encoding of msg.sender, simulating abi.encodeWithSelector
_data
)
);
bytes memory nodeData = abi.encodePacked(oldCount, _to, msg.sender, _data);

// single hashed leaf
bytes32 newInboxNode = keccak256(nodeData);
Expand Down
25 changes: 21 additions & 4 deletions contracts/src/arbitrumToGnosis/VeaOutboxArbToGnosis.sol
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: MIT

/// @custom:authors: [@jaybuidl, @shotaronowhere]
/// @custom:authors: [@jaybuidl, @mani99brar, @shotaronowhere]
/// @custom:reviewers: []
/// @custom:auditors: []
/// @custom:bounties: []
Expand Down Expand Up @@ -42,6 +42,7 @@ contract VeaOutboxArbToGnosis is IVeaOutboxOnL1, ISequencerDelayUpdatable {

mapping(uint256 epoch => bytes32) public claimHashes; // epoch => claim
mapping(uint256 messageId => bytes32) internal relayed; // msgId/256 => packed replay bitmap, preferred over a simple boolean mapping to save 15k gas per message
mapping(address => mapping(address => bool)) public allowlist; // to => from => allowed, Enforces allowed sender addresses for a receiver contract. Address(0) allowing all senders.

uint256 public sequencerDelayLimit; // This is MaxTimeVariation.delaySeconds from the arbitrum sequencer inbox, it is the maximum seconds the sequencer can backdate L2 txns relative to the L1 clock.
uint256 public timestampDelayUpdated; // The timestamp of the last sequencer delay update.
Expand Down Expand Up @@ -295,15 +296,31 @@ contract VeaOutboxArbToGnosis is IVeaOutboxOnL1, ISequencerDelayUpdatable {
emit Verified(_epoch);
}

/// @dev Sets the allowlist for the sender gateway.
/// @param _from The address to allow or disallow
/// @param _allow Whether to allow or disallow the address.
function setAllowlist(address _from, bool _allow) external {
allowlist[msg.sender][_from] = _allow;
}

/// @dev Verifies and relays the message. UNTRUSTED.
/// @param _proof The merkle proof to prove the message inclusion in the inbox state root.
/// @param _msgId The zero based index of the message in the inbox.
/// @param _to The address of the contract on Gnosis to call.
/// @param _message The message encoded in the vea inbox as abi.encodeWithSelector(fnSelector, msg.sender, param1, param2, ...)
function sendMessage(bytes32[] calldata _proof, uint64 _msgId, address _to, bytes calldata _message) external {
/// @param _from The address of the contract on Arbitrum that sent the message.
/// @param _message The message in the vea inbox as abi.encodeWithSelector(fnSelector, param1, param2, ...)
function sendMessage(
bytes32[] calldata _proof,
uint64 _msgId,
address _to,
address _from,
bytes calldata _message
) external {
require(_proof.length < 64, "Proof too long.");
bool isAllowed = allowlist[_to][_from] || allowlist[_to][address(0)];
require(isAllowed, "Message sender not allowed to call receiver.");

bytes32 nodeHash = keccak256(abi.encodePacked(_msgId, _to, _message));
bytes32 nodeHash = keccak256(abi.encodePacked(_msgId, _to, _from, _message));

// double hashed leaf
// avoids second order preimage attacks
Expand Down
16 changes: 3 additions & 13 deletions contracts/src/gnosisToArbitrum/VeaInboxGnosisToArb.sol
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Expand Up @@ -71,26 +71,16 @@ contract VeaInboxGnosisToArb is IVeaInbox {
/// Amortized cost is constant.
/// Note: See docs for details how inbox manages merkle tree state.
/// @param _to The address of the contract on the receiving chain which receives the calldata.
/// @param _fnSelector The function selector of the receiving contract.
/// @param _data The message calldata, abi.encode(param1, param2, ...)
/// @param _data The message calldata, abi.encodeWithSelector(fnSelector, param1, param2, ...)
/// @return msgId The zero based index of the message in the inbox.
function sendMessage(address _to, bytes4 _fnSelector, bytes memory _data) external override returns (uint64) {
function sendMessage(address _to, bytes calldata _data) external override returns (uint64) {
uint64 oldCount = count;

// Given arbitrum's speed limit of 7 million gas / second, it would take atleast 8 million years of full blocks to overflow.
// It *should* be impossible to overflow, but we check to be safe when appending to the tree.
require(oldCount < type(uint64).max, "Inbox is full.");

bytes memory nodeData = abi.encodePacked(
oldCount,
_to,
// _data is abi.encode(param1, param2, ...), we need to encode it again to get the correct leaf data
abi.encodePacked( // equivalent to abi.encodeWithSelector(fnSelector, msg.sender, param1, param2, ...)
_fnSelector,
bytes32(uint256(uint160(msg.sender))), // big endian padded encoding of msg.sender, simulating abi.encodeWithSelector
_data
)
);
bytes memory nodeData = abi.encodePacked(oldCount, _to, msg.sender, _data);

// single hashed leaf
bytes32 newInboxNode = keccak256(nodeData);
Expand Down
24 changes: 21 additions & 3 deletions contracts/src/gnosisToArbitrum/VeaOutboxGnosisToArb.sol
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Expand Up @@ -41,6 +41,7 @@ contract VeaOutboxGnosisToArb is IVeaOutboxOnL2 {
mapping(uint256 epoch => Claim) public claims; // epoch => claim
mapping(uint256 epoch => address) public challengers; // epoch => challenger
mapping(uint256 messageId => bytes32) internal relayed; // msgId/256 => packed replay bitmap, preferred over a simple boolean mapping to save 15k gas per message
mapping(address => mapping(address => bool)) public allowlist; // to => from => allowed

enum Party {
None,
Expand Down Expand Up @@ -281,15 +282,32 @@ contract VeaOutboxGnosisToArb is IVeaOutboxOnL2 {
emit Verified(_epoch);
}

/// @dev Sets the allowlist for the sender gateway.
/// Note: Address(0) is used to allow all addresses.
/// @param _from The address to allow or disallow
/// @param _allowed Whether to allow or disallow the address.
function setAllowlist(address _from, bool _allowed) external {
allowlist[msg.sender][_from] = _allowed;
}

/// @dev Verifies and relays the message. UNTRUSTED.
/// @param _proof The merkle proof to prove the message inclusion in the inbox state root.
/// @param _msgId The zero based index of the message in the inbox.
/// @param _to The address of the contract on Arbitrum to call.
/// @param _message The message encoded in the vea inbox as abi.encodeWithSelector(fnSelector, msg.sender, param1, param2, ...)
function sendMessage(bytes32[] memory _proof, uint64 _msgId, address _to, bytes memory _message) external {
/// @param _from The address of the message sender
/// @param _message The message in the vea inbox as abi.encodeWithSelector(fnSelector, param1, param2, ...)
Comment on lines +297 to +298
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⚠️ Potential issue

Parameter documentation is incomplete.

The NatSpec comment for the _from parameter doesn't match the actual parameter name or purpose correctly.

Apply this diff to fix the documentation:

-    /// @param _from The address of the message sender
+    /// @param _from The address of the message sender on the source chain.
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
/// @param _from The address of the message sender
/// @param _message The message in the vea inbox as abi.encodeWithSelector(fnSelector, param1, param2, ...)
/// @param _from The address of the message sender on the source chain.
/// @param _message The message in the vea inbox as abi.encodeWithSelector(fnSelector, param1, param2, ...)
🤖 Prompt for AI Agents 
In contracts/src/gnosisToArbitrum/VeaOutboxGnosisToArb.sol around lines 297 to
298, the NatSpec @param for `_from` is incorrect or misleading; update the
comment to use the correct parameter name and describe its actual purpose (e.g.,
the original sender/address that posted the message into the Vea inbox on the
source chain) and ensure the `_message` param line remains accurate (message
ABI-encoded with selector and parameters).

function sendMessage(
bytes32[] memory _proof,
uint64 _msgId,
address _to,
address _from,
bytes memory _message
) external {
require(_proof.length < 64, "Proof too long.");
bool isAllowed = allowlist[_to][_from] || allowlist[_to][address(0)];
require(isAllowed, "Message sender not allowed to call receiver.");

bytes32 nodeHash = keccak256(abi.encodePacked(_msgId, _to, _message));
bytes32 nodeHash = keccak256(abi.encodePacked(_msgId, _to, _from, _message));

// double hashed leaf
// avoids second order preimage attacks
Expand Down
5 changes: 2 additions & 3 deletions contracts/src/interfaces/inboxes/IVeaInbox.sol
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Expand Up @@ -12,10 +12,9 @@ interface IVeaInbox {
/// @dev Sends an arbitrary message to receiving chain.
/// Note: Calls authenticated by receiving gateway checking the sender argument.
/// @param _to The cross-domain contract address which receives the calldata.
/// @param _fnSelection The function selector of the receiving contract.
/// @param _data The message calldata, abi.encode(...)
/// @param _data The message calldata, abi.encodeWithSelector(...)
/// @return msgId The index of the message in the inbox, as a message Id, needed to relay the message.
function sendMessage(address _to, bytes4 _fnSelection, bytes memory _data) external returns (uint64 msgId);
function sendMessage(address _to, bytes calldata _data) external returns (uint64 msgId);
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💡 Verification agent

🧩 Analysis chain

Locate and update all callers to the new 2-arg signature

Make sure internal tools, relayers, and tests no longer pass a separate selector/arg.

🏁 Script executed:

#!/bin/bash
# Find old-style 3-arg calls
rg -n -A1 -B2 $'sendMessage\\s*\\(\\s*[^,]+,\\s*[^,]+,\\s*[^)]*\\)' -g '!**/interfaces/**'

# List all sendMessage calls for manual review
rg -n -A1 -B2 $'sendMessage\\s*\\('

Length of output: 312375

Update all sendMessage invocations to drop the removed selector/from argument

The inbox sendMessage signature has been simplified to two parameters (address _to, bytes calldata _data), and the outbox sendMessage no longer takes a separate sender argument. Please remove the extra argument from every call and merge the former from (or selector) into the calldata.

Affected call sites:
• relay-cli/src/utils/relay.ts (around lines 61–64):

  • Change
    veaOutbox.sendMessage(proof, nonce, to, from, data)
    to
    veaOutbox.sendMessage(proof, nonce, to, dataWithSender)
    • contracts/test/integration/ArbToGnosis.ts (lines 304, 308, 366, 430, 769, 946):
  • Replace each
    …sendMessage(proof, nonce, to, from, msgData)
    with
    …sendMessage(proof, nonce, to, msgDataWithSender)
    • contracts/test/integration/ArbToEth.ts (lines 287, 292, 295, 348, 402, 407, 410, 463, 468, 541, 625, 847, 975):
  • Same 5-arg → 4-arg update
    • Search for any other .sendMessage( invocations with three or more comma-separated args (outside /interfaces) and refactor accordingly.

Ensure the passed bytes payload includes both selector and original sender where required.

🤖 Prompt for AI Agents 
In contracts/src/interfaces/inboxes/IVeaInbox.sol around line 17, the
sendMessage signature was simplified to (address _to, bytes calldata _data);
update all call sites to remove the extra sender/selector argument and instead
embed the former from/selector into the bytes calldata payload. Specifically, in
relay-cli/src/utils/relay.ts (around lines 61–64) change
veaOutbox.sendMessage(proof, nonce, to, from, data) to
veaOutbox.sendMessage(proof, nonce, to, dataWithSender) where dataWithSender is
data prefixed or merged with the sender/selector; in
contracts/test/integration/ArbToGnosis.ts (lines ~304, 308, 366, 430, 769, 946)
and contracts/test/integration/ArbToEth.ts (lines ~287, 292, 295, 348, 402, 407,
410, 463, 468, 541, 625, 847, 975) replace each 5-arg call with the 4-arg
variant and construct msgDataWithSender by concatenating the selector/sender
into the bytes payload; also grep the repo for any other .sendMessage( calls
with 3+ comma-separated args (excluding /interfaces) and refactor them similarly
so the bytes payload contains selector and original sender where required.


/// @dev Snapshots can be saved a maximum of once per epoch.
/// Saves snapshot of state root.
Expand Down
17 changes: 15 additions & 2 deletions contracts/src/interfaces/outboxes/IVeaOutboxOnL1.sol
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Expand Up @@ -11,19 +11,32 @@ pragma solidity ^0.8.24;
import "../types/VeaClaim.sol";

/// @dev Interface of the Vea Outbox on L1 chains like Ethereum, Gnosis, Polygon POS where storage is expensive.

interface IVeaOutboxOnL1 {
/// @dev Verifies and relays the message.
/// Note: Gateways expect first argument of message call to be the arbitrum message sender, used for authentication.
/// @param _proof The merkle proof to prove the message.
/// @param _msgId The zero based index of the message in the inbox.
/// @param _to The address to send the message to.
/// @param _from The address of the contract on L2 that sent the message, used for authentication.
/// @param _message The message to relay.
function sendMessage(bytes32[] calldata _proof, uint64 _msgId, address _to, bytes calldata _message) external;
function sendMessage(
bytes32[] calldata _proof,
uint64 _msgId,
address _to,
address _from,
bytes calldata _message
) external;

/// @dev Resolves any challenge of the optimistic claim for 'epoch' using the canonical bridge.
/// Note: Access restricted to canonical bridge.
/// @param _epoch The epoch to verify.
/// @param _stateRoot The true state root for the epoch.
/// @param _claim The claim associated with the epoch.
function resolveDisputedClaim(uint256 _epoch, bytes32 _stateRoot, Claim memory _claim) external;

/// @dev Sets the allowlist for the sender gateway.
/// Note: Address(0) is used to allow all addresses.
/// @param _from The address to allow or disallow
/// @param _allow Whether to allow or disallow the address.
function setAllowlist(address _from, bool _allow) external;
}
15 changes: 14 additions & 1 deletion contracts/src/interfaces/outboxes/IVeaOutboxOnL2.sol
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Expand Up @@ -15,12 +15,25 @@ interface IVeaOutboxOnL2 {
/// @param _proof The merkle proof to prove the message.
/// @param _msgId The zero based index of the message in the inbox.
/// @param _to The address to send the message to.
/// @param _from The address of the message sender.
/// @param _message The message to relay.
function sendMessage(bytes32[] calldata _proof, uint64 _msgId, address _to, bytes calldata _message) external;
function sendMessage(
bytes32[] calldata _proof,
uint64 _msgId,
address _to,
address _from,
bytes calldata _message
) external;

/// @dev Resolves any challenge of the optimistic claim for 'epoch' using the canonical bridge.
/// Note: Access restricted to canonical bridge.
/// @param _epoch The epoch to verify.
/// @param _stateRoot The true state root for the epoch.
function resolveDisputedClaim(uint256 _epoch, bytes32 _stateRoot) external;

/// @dev Sets the allowlist for the sender gateway.
/// Note: Address(0) is used to allow all addresses.
/// @param _from The address to allow or disallow
/// @param _allow Whether to allow or disallow the address.
function setAllowlist(address _from, bool _allow) external;
}
5 changes: 4 additions & 1 deletion contracts/src/test/gateways/IReceiverGatewayMock.sol
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Expand Up @@ -12,5 +12,8 @@ import "../../interfaces/gateways/IReceiverGateway.sol";

interface IReceiverGatewayMock is IReceiverGateway {
/// Receive the message from the sender gateway.
function receiveMessage(address msgSender, uint256 _data) external;
function receiveMessage(uint256 _data) external;

/// Receive the message array from the sender gateway.
function receiveMessageArray(uint256[] calldata _data) external;
}
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