cmd: implement abidump (#19958)

* abidump: implement abi dump command

* cmd/abidump: add license
This commit is contained in:
Martin Holst Swende 2020-01-21 15:51:36 +01:00 committed by Guillaume Ballet
parent 31baf3a9af
commit 33c56ebc67
3 changed files with 79 additions and 5 deletions

74
cmd/abidump/main.go Normal file
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@ -0,0 +1,74 @@
// Copyright 2019 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"encoding/hex"
"flag"
"fmt"
"os"
"strings"
"github.com/ethereum/go-ethereum/signer/core"
"github.com/ethereum/go-ethereum/signer/fourbyte"
)
func init() {
flag.Usage = func() {
fmt.Fprintln(os.Stderr, "Usage:", os.Args[0], "<hexdata>")
flag.PrintDefaults()
fmt.Fprintln(os.Stderr, `
Parses the given ABI data and tries to interpret it from the fourbyte database.`)
}
}
func parse(data []byte) {
db, err := fourbyte.New()
if err != nil {
die(err)
}
messages := core.ValidationMessages{}
db.ValidateCallData(nil, data, &messages)
for _, m := range messages.Messages {
fmt.Printf("%v: %v\n", m.Typ, m.Message)
}
}
// Example
// ./abidump a9059cbb000000000000000000000000ea0e2dc7d65a50e77fc7e84bff3fd2a9e781ff5c0000000000000000000000000000000000000000000000015af1d78b58c40000
func main() {
flag.Parse()
switch {
case flag.NArg() == 1:
hexdata := flag.Arg(0)
data, err := hex.DecodeString(strings.TrimPrefix(hexdata, "0x"))
if err != nil {
die(err)
}
parse(data)
default:
fmt.Fprintln(os.Stderr, "Error: one argument needed")
flag.Usage()
os.Exit(2)
}
}
func die(args ...interface{}) {
fmt.Fprintln(os.Stderr, args...)
os.Exit(1)
}

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@ -137,7 +137,7 @@ func parseCallData(calldata []byte, abidata string) (*decodedCallData, error) {
} }
values, err := method.Inputs.UnpackValues(argdata) values, err := method.Inputs.UnpackValues(argdata)
if err != nil { if err != nil {
return nil, err return nil, fmt.Errorf("signature %q matches, but arguments mismatch: %v", method.String(), err)
} }
// Everything valid, assemble the call infos for the signer // Everything valid, assemble the call infos for the signer
decoded := decodedCallData{signature: method.Sig(), name: method.RawName} decoded := decodedCallData{signature: method.Sig(), name: method.RawName}

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@ -74,13 +74,13 @@ func (db *Database) ValidateTransaction(selector *string, tx *core.SendTxArgs) (
messages.Crit("Transaction recipient is the zero address") messages.Crit("Transaction recipient is the zero address")
} }
// Semantic fields validated, try to make heads or tails of the call data // Semantic fields validated, try to make heads or tails of the call data
db.validateCallData(selector, data, messages) db.ValidateCallData(selector, data, messages)
return messages, nil return messages, nil
} }
// validateCallData checks if the ABI call-data + method selector (if given) can // ValidateCallData checks if the ABI call-data + method selector (if given) can
// be parsed and seems to match. // be parsed and seems to match.
func (db *Database) validateCallData(selector *string, data []byte, messages *core.ValidationMessages) { func (db *Database) ValidateCallData(selector *string, data []byte, messages *core.ValidationMessages) {
// If the data is empty, we have a plain value transfer, nothing more to do // If the data is empty, we have a plain value transfer, nothing more to do
if len(data) == 0 { if len(data) == 0 {
return return
@ -110,7 +110,7 @@ func (db *Database) validateCallData(selector *string, data []byte, messages *co
return return
} }
if info, err := verifySelector(embedded, data); err != nil { if info, err := verifySelector(embedded, data); err != nil {
messages.Warn(fmt.Sprintf("Transaction contains data, but provided ABI signature could not be varified: %v", err)) messages.Warn(fmt.Sprintf("Transaction contains data, but provided ABI signature could not be verified: %v", err))
} else { } else {
messages.Info(info.String()) messages.Info(info.String())
} }