713 lines
18 KiB
Go
713 lines
18 KiB
Go
package cli
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import (
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"bytes"
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"crypto/elliptic"
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"encoding/base64"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"math/big"
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"os"
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"strconv"
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"strings"
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"text/tabwriter"
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"github.com/abiosoft/ishell/v2"
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"github.com/abiosoft/readline"
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"github.com/nspcc-dev/neo-go/pkg/compiler"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/encoding/address"
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"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/util/slice"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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const (
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vmKey = "vm"
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manifestKey = "manifest"
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boolType = "bool"
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boolFalse = "false"
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boolTrue = "true"
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intType = "int"
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stringType = "string"
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exitFunc = "exitFunc"
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)
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var commands = []*ishell.Cmd{
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{
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Name: "exit",
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Help: "Exit the VM prompt",
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LongHelp: "Exit the VM prompt",
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Func: handleExit,
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},
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{
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Name: "ip",
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Help: "Show current instruction",
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LongHelp: "Show current instruction",
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Func: handleIP,
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},
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{
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Name: "break",
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Help: "Place a breakpoint",
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LongHelp: `Usage: break <ip>
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<ip> is mandatory parameter, example:
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> break 12`,
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Func: handleBreak,
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},
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{
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Name: "estack",
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Help: "Show evaluation stack contents",
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LongHelp: "Show evaluation stack contents",
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Func: handleXStack,
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},
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{
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Name: "istack",
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Help: "Show invocation stack contents",
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LongHelp: "Show invocation stack contents",
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Func: handleXStack,
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},
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{
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Name: "sslot",
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Help: "Show static slot contents",
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LongHelp: "Show static slot contents",
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Func: handleSlots,
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},
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{
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Name: "lslot",
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Help: "Show local slot contents",
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LongHelp: "Show local slot contents",
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Func: handleSlots,
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},
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{
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Name: "aslot",
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Help: "Show arguments slot contents",
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LongHelp: "Show arguments slot contents",
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Func: handleSlots,
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},
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{
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Name: "loadnef",
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Help: "Load a NEF-consistent script into the VM",
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LongHelp: `Usage: loadnef <file> <manifest>
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both parameters are mandatory, example:
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> loadnef /path/to/script.nef /path/to/manifest.json`,
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Func: handleLoadNEF,
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},
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{
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Name: "loadbase64",
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Help: "Load a base64-encoded script string into the VM",
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LongHelp: `Usage: loadbase64 <string>
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<string> is mandatory parameter, example:
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> loadbase64 AwAQpdToAAAADBQV9ehtQR1OrVZVhtHtoUHRfoE+agwUzmFvf3Rhfg/EuAVYOvJgKiON9j8TwAwIdHJhbnNmZXIMFDt9NxHG8Mz5sdypA9G/odiW8SOMQWJ9W1I4`,
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Func: handleLoadBase64,
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},
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{
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Name: "loadhex",
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Help: "Load a hex-encoded script string into the VM",
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LongHelp: `Usage: loadhex <string>
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<string> is mandatory parameter, example:
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> loadhex 0c0c48656c6c6f20776f726c6421`,
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Func: handleLoadHex,
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},
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{
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Name: "loadgo",
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Help: "Compile and load a Go file with the manifest into the VM",
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LongHelp: `Usage: loadgo <file>
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<file> is mandatory parameter, example:
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> loadgo /path/to/file.go`,
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Func: handleLoadGo,
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},
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{
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Name: "parse",
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Help: "Parse provided argument and convert it into other possible formats",
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LongHelp: `Usage: parse <arg>
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<arg> is an argument which is tried to be interpreted as an item of different types
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and converted to other formats. Strings are escaped and output in quotes.`,
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Func: handleParse,
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},
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{
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Name: "run",
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Help: "Execute the current loaded script",
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LongHelp: `Usage: run [<method> [<parameter>...]]
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<method> is a contract method, specified in manifest (and it
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can't be 'help' at the moment). It can be '_' which will push parameters
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onto the stack and execute from the current offset.
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<parameter> is a parameter (can be repeated multiple times) that can be specified
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as <type>:<value>, where type can be:
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'` + boolType + `': supports '` + boolFalse + `' and '` + boolTrue + `' values
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'` + intType + `': supports integers as values
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'` + stringType + `': supports strings as values (that are pushed as a byte array
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values to the stack)
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or can be just <value>, for which the type will be detected automatically
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following these rules: '` + boolTrue + `' and '` + boolFalse + `' are treated as respective
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boolean values, everything that can be converted to integer is treated as
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integer and everything else is treated like a string.
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Example:
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> run put ` + stringType + `:"Something to put"`,
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Func: handleRun,
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},
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{
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Name: "cont",
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Help: "Continue execution of the current loaded script",
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LongHelp: "Continue execution of the current loaded script",
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Func: handleCont,
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},
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{
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Name: "step",
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Help: "Step (n) instruction in the program",
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LongHelp: `Usage: step [<n>]
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<n> is optional parameter to specify number of instructions to run, example:
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> step 10`,
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Func: handleStep,
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},
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{
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Name: "stepinto",
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Help: "Stepinto instruction to take in the debugger",
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LongHelp: `Usage: stepInto
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example:
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> stepinto`,
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Func: handleStepInto,
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},
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{
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Name: "stepout",
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Help: "Stepout instruction to take in the debugger",
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LongHelp: `Usage: stepOut
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example:
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> stepout`,
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Func: handleStepOut,
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},
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{
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Name: "stepover",
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Help: "Stepover instruction to take in the debugger",
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LongHelp: `Usage: stepOver
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example:
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> stepover`,
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Func: handleStepOver,
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},
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{
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Name: "ops",
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Help: "Dump opcodes of the current loaded program",
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LongHelp: "Dump opcodes of the current loaded program",
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Func: handleOps,
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},
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}
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// Various errors.
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var (
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ErrMissingParameter = errors.New("missing argument")
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ErrInvalidParameter = errors.New("can't parse argument")
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)
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// VMCLI object for interacting with the VM.
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type VMCLI struct {
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vm *vm.VM
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shell *ishell.Shell
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// printLogo specifies if logo is printed.
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printLogo bool
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}
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// New returns a new VMCLI object.
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func New() *VMCLI {
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return NewWithConfig(true, os.Exit, &readline.Config{
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Prompt: ">>>",
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})
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}
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// NewWithConfig returns new VMCLI instance using provided config.
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func NewWithConfig(printLogo bool, onExit func(int), c *readline.Config) *VMCLI {
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vmcli := VMCLI{
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vm: vm.New(),
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shell: ishell.NewWithConfig(c),
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printLogo: printLogo,
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}
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vmcli.shell.Set(vmKey, vmcli.vm)
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vmcli.shell.Set(manifestKey, new(manifest.Manifest))
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vmcli.shell.Set(exitFunc, onExit)
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for _, c := range commands {
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vmcli.shell.AddCmd(c)
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}
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changePrompt(vmcli.shell, vmcli.vm)
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return &vmcli
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}
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func getVMFromContext(c *ishell.Context) *vm.VM {
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return c.Get(vmKey).(*vm.VM)
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}
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func getManifestFromContext(c *ishell.Context) *manifest.Manifest {
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return c.Get(manifestKey).(*manifest.Manifest)
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}
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func setManifestInContext(c *ishell.Context, m *manifest.Manifest) {
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old := getManifestFromContext(c)
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*old = *m
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}
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func checkVMIsReady(c *ishell.Context) bool {
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v := getVMFromContext(c)
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if v == nil || !v.Ready() {
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c.Err(errors.New("VM is not ready: no program loaded"))
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return false
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}
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return true
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}
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func handleExit(c *ishell.Context) {
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c.Println("Bye!")
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c.Get(exitFunc).(func(int))(0)
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}
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func handleIP(c *ishell.Context) {
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if !checkVMIsReady(c) {
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return
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}
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v := getVMFromContext(c)
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ctx := v.Context()
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if ctx.NextIP() < ctx.LenInstr() {
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ip, opcode := v.Context().NextInstr()
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c.Printf("instruction pointer at %d (%s)\n", ip, opcode)
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} else {
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c.Println("execution has finished")
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}
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}
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func handleBreak(c *ishell.Context) {
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if !checkVMIsReady(c) {
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return
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}
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v := getVMFromContext(c)
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if len(c.Args) != 1 {
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c.Err(fmt.Errorf("%w: <ip>", ErrMissingParameter))
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return
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}
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n, err := strconv.Atoi(c.Args[0])
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if err != nil {
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c.Err(fmt.Errorf("%w: %v", ErrInvalidParameter, err))
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return
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}
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v.AddBreakPoint(n)
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c.Printf("breakpoint added at instruction %d\n", n)
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}
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func handleXStack(c *ishell.Context) {
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v := getVMFromContext(c)
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var stackDump string
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switch c.Cmd.Name {
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case "estack":
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stackDump = v.DumpEStack()
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case "istack":
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stackDump = v.DumpIStack()
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default:
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c.Err(errors.New("unknown stack"))
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return
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}
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c.Println(stackDump)
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}
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func handleSlots(c *ishell.Context) {
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v := getVMFromContext(c)
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vmCtx := v.Context()
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if vmCtx == nil {
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c.Err(errors.New("no program loaded"))
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return
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}
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var rawSlot string
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switch c.Cmd.Name {
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case "sslot":
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rawSlot = vmCtx.DumpStaticSlot()
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case "lslot":
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rawSlot = vmCtx.DumpLocalSlot()
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case "aslot":
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rawSlot = vmCtx.DumpArgumentsSlot()
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default:
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c.Err(errors.New("unknown slot"))
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return
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}
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c.Println(rawSlot)
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}
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func handleLoadNEF(c *ishell.Context) {
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v := getVMFromContext(c)
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if len(c.Args) < 2 {
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c.Err(fmt.Errorf("%w: <file> <manifest>", ErrMissingParameter))
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return
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}
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if err := v.LoadFileWithFlags(c.Args[0], callflag.All); err != nil {
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c.Err(err)
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return
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}
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m, err := getManifestFromFile(c.Args[1])
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if err != nil {
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c.Err(err)
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return
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}
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c.Printf("READY: loaded %d instructions\n", v.Context().LenInstr())
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setManifestInContext(c, m)
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changePrompt(c, v)
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}
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func handleLoadBase64(c *ishell.Context) {
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v := getVMFromContext(c)
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if len(c.Args) < 1 {
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c.Err(fmt.Errorf("%w: <string>", ErrMissingParameter))
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return
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}
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b, err := base64.StdEncoding.DecodeString(c.Args[0])
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if err != nil {
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c.Err(fmt.Errorf("%w: %v", ErrInvalidParameter, err))
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return
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}
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v.LoadWithFlags(b, callflag.All)
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c.Printf("READY: loaded %d instructions\n", v.Context().LenInstr())
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changePrompt(c, v)
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}
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func handleLoadHex(c *ishell.Context) {
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v := getVMFromContext(c)
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if len(c.Args) < 1 {
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c.Err(fmt.Errorf("%w: <string>", ErrMissingParameter))
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return
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}
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b, err := hex.DecodeString(c.Args[0])
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if err != nil {
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c.Err(fmt.Errorf("%w: %v", ErrInvalidParameter, err))
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return
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}
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v.LoadWithFlags(b, callflag.All)
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c.Printf("READY: loaded %d instructions\n", v.Context().LenInstr())
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changePrompt(c, v)
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}
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func handleLoadGo(c *ishell.Context) {
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v := getVMFromContext(c)
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if len(c.Args) < 1 {
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c.Err(fmt.Errorf("%w: <file>", ErrMissingParameter))
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return
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}
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b, di, err := compiler.CompileWithDebugInfo(c.Args[0], nil)
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if err != nil {
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c.Err(err)
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return
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}
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// Don't perform checks, just load.
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m, err := di.ConvertToManifest(&compiler.Options{})
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if err != nil {
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c.Err(fmt.Errorf("can't create manifest: %w", err))
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return
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}
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setManifestInContext(c, m)
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v.LoadWithFlags(b, callflag.All)
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c.Printf("READY: loaded %d instructions\n", v.Context().LenInstr())
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changePrompt(c, v)
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}
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func getManifestFromFile(name string) (*manifest.Manifest, error) {
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bs, err := ioutil.ReadFile(name)
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if err != nil {
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return nil, fmt.Errorf("%w: can't read manifest", ErrInvalidParameter)
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}
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var m manifest.Manifest
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if err := json.Unmarshal(bs, &m); err != nil {
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return nil, fmt.Errorf("%w: can't unmarshal manifest", ErrInvalidParameter)
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}
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return &m, nil
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}
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func handleRun(c *ishell.Context) {
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v := getVMFromContext(c)
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m := getManifestFromContext(c)
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if len(c.Args) != 0 {
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var (
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params []stackitem.Item
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offset int
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err error
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runCurrent = c.Args[0] != "_"
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)
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params, err = parseArgs(c.Args[1:])
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if err != nil {
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c.Err(err)
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return
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}
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if runCurrent {
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md := m.ABI.GetMethod(c.Args[0], len(params))
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if md == nil {
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c.Err(fmt.Errorf("%w: method not found", ErrInvalidParameter))
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return
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}
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offset = md.Offset
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}
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for i := len(params) - 1; i >= 0; i-- {
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v.Estack().PushVal(params[i])
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}
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if runCurrent {
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if !v.Ready() {
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c.Err(fmt.Errorf("no program loaded"))
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return
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}
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v.Context().Jump(offset)
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if initMD := m.ABI.GetMethod(manifest.MethodInit, 0); initMD != nil {
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v.Call(initMD.Offset)
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}
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}
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}
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runVMWithHandling(c, v)
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changePrompt(c, v)
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}
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// runVMWithHandling runs VM with handling errors and additional state messages.
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func runVMWithHandling(c *ishell.Context, v *vm.VM) {
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err := v.Run()
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if err != nil {
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c.Err(err)
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}
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var message string
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switch {
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case v.HasFailed():
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message = "" // the error will be printed on return
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case v.HasHalted():
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message = v.DumpEStack()
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case v.AtBreakpoint():
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ctx := v.Context()
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if ctx.NextIP() < ctx.LenInstr() {
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i, op := ctx.NextInstr()
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message = fmt.Sprintf("at breakpoint %d (%s)", i, op)
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} else {
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message = "execution has finished"
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}
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}
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if message != "" {
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c.Println(message)
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}
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}
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func handleCont(c *ishell.Context) {
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if !checkVMIsReady(c) {
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return
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}
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v := getVMFromContext(c)
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runVMWithHandling(c, v)
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changePrompt(c, v)
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}
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func handleStep(c *ishell.Context) {
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var (
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n = 1
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err error
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)
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if !checkVMIsReady(c) {
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return
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}
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v := getVMFromContext(c)
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if len(c.Args) > 0 {
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n, err = strconv.Atoi(c.Args[0])
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if err != nil {
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c.Err(fmt.Errorf("%w: %v", ErrInvalidParameter, err))
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return
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}
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}
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v.AddBreakPointRel(n)
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runVMWithHandling(c, v)
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changePrompt(c, v)
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}
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func handleStepInto(c *ishell.Context) {
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handleStepType(c, "into")
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}
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func handleStepOut(c *ishell.Context) {
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handleStepType(c, "out")
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}
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func handleStepOver(c *ishell.Context) {
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handleStepType(c, "over")
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}
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func handleStepType(c *ishell.Context, stepType string) {
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if !checkVMIsReady(c) {
|
|
return
|
|
}
|
|
v := getVMFromContext(c)
|
|
var err error
|
|
switch stepType {
|
|
case "into":
|
|
err = v.StepInto()
|
|
case "out":
|
|
err = v.StepOut()
|
|
case "over":
|
|
err = v.StepOver()
|
|
}
|
|
if err != nil {
|
|
c.Err(err)
|
|
} else {
|
|
handleIP(c)
|
|
}
|
|
changePrompt(c, v)
|
|
}
|
|
|
|
func handleOps(c *ishell.Context) {
|
|
if !checkVMIsReady(c) {
|
|
return
|
|
}
|
|
v := getVMFromContext(c)
|
|
out := bytes.NewBuffer(nil)
|
|
v.PrintOps(out)
|
|
c.Println(out.String())
|
|
}
|
|
|
|
func changePrompt(c ishell.Actions, v *vm.VM) {
|
|
if v.Ready() && v.Context().NextIP() >= 0 && v.Context().NextIP() < v.Context().LenInstr() {
|
|
c.SetPrompt(fmt.Sprintf("NEO-GO-VM %d > ", v.Context().NextIP()))
|
|
} else {
|
|
c.SetPrompt("NEO-GO-VM > ")
|
|
}
|
|
}
|
|
|
|
// Run waits for user input from Stdin and executes the passed command.
|
|
func (c *VMCLI) Run() error {
|
|
if c.printLogo {
|
|
printLogo(c.shell)
|
|
}
|
|
c.shell.Run()
|
|
return nil
|
|
}
|
|
|
|
func handleParse(c *ishell.Context) {
|
|
res, err := Parse(c.Args)
|
|
if err != nil {
|
|
c.Err(err)
|
|
return
|
|
}
|
|
c.Print(res)
|
|
}
|
|
|
|
// Parse converts it's argument to other formats.
|
|
func Parse(args []string) (string, error) {
|
|
if len(args) < 1 {
|
|
return "", ErrMissingParameter
|
|
}
|
|
arg := args[0]
|
|
buf := bytes.NewBuffer(nil)
|
|
if val, err := strconv.ParseInt(arg, 10, 64); err == nil {
|
|
bs := bigint.ToBytes(big.NewInt(val))
|
|
buf.WriteString(fmt.Sprintf("Integer to Hex\t%s\n", hex.EncodeToString(bs)))
|
|
buf.WriteString(fmt.Sprintf("Integer to Base64\t%s\n", base64.StdEncoding.EncodeToString(bs)))
|
|
}
|
|
noX := strings.TrimPrefix(arg, "0x")
|
|
if rawStr, err := hex.DecodeString(noX); err == nil {
|
|
if val, err := util.Uint160DecodeBytesBE(rawStr); err == nil {
|
|
buf.WriteString(fmt.Sprintf("BE ScriptHash to Address\t%s\n", address.Uint160ToString(val)))
|
|
buf.WriteString(fmt.Sprintf("LE ScriptHash to Address\t%s\n", address.Uint160ToString(val.Reverse())))
|
|
}
|
|
if pub, err := keys.NewPublicKeyFromBytes(rawStr, elliptic.P256()); err == nil {
|
|
sh := pub.GetScriptHash()
|
|
buf.WriteString(fmt.Sprintf("Public key to BE ScriptHash\t%s\n", sh))
|
|
buf.WriteString(fmt.Sprintf("Public key to LE ScriptHash\t%s\n", sh.Reverse()))
|
|
buf.WriteString(fmt.Sprintf("Public key to Address\t%s\n", address.Uint160ToString(sh)))
|
|
}
|
|
buf.WriteString(fmt.Sprintf("Hex to String\t%s\n", fmt.Sprintf("%q", string(rawStr))))
|
|
buf.WriteString(fmt.Sprintf("Hex to Integer\t%s\n", bigint.FromBytes(rawStr)))
|
|
buf.WriteString(fmt.Sprintf("Swap Endianness\t%s\n", hex.EncodeToString(slice.CopyReverse(rawStr))))
|
|
}
|
|
if addr, err := address.StringToUint160(arg); err == nil {
|
|
buf.WriteString(fmt.Sprintf("Address to BE ScriptHash\t%s\n", addr))
|
|
buf.WriteString(fmt.Sprintf("Address to LE ScriptHash\t%s\n", addr.Reverse()))
|
|
buf.WriteString(fmt.Sprintf("Address to Base64 (BE)\t%s\n", base64.StdEncoding.EncodeToString(addr.BytesBE())))
|
|
buf.WriteString(fmt.Sprintf("Address to Base64 (LE)\t%s\n", base64.StdEncoding.EncodeToString(addr.BytesLE())))
|
|
}
|
|
if rawStr, err := base64.StdEncoding.DecodeString(arg); err == nil {
|
|
buf.WriteString(fmt.Sprintf("Base64 to String\t%s\n", fmt.Sprintf("%q", string(rawStr))))
|
|
buf.WriteString(fmt.Sprintf("Base64 to BigInteger\t%s\n", bigint.FromBytes(rawStr)))
|
|
if u, err := util.Uint160DecodeBytesBE(rawStr); err == nil {
|
|
buf.WriteString(fmt.Sprintf("Base64 to BE ScriptHash\t%s\n", u.StringBE()))
|
|
buf.WriteString(fmt.Sprintf("Base64 to LE ScriptHash\t%s\n", u.StringLE()))
|
|
buf.WriteString(fmt.Sprintf("Base64 to Address (BE)\t%s\n", address.Uint160ToString(u)))
|
|
buf.WriteString(fmt.Sprintf("Base64 to Address (LE)\t%s\n", address.Uint160ToString(u.Reverse())))
|
|
}
|
|
}
|
|
|
|
buf.WriteString(fmt.Sprintf("String to Hex\t%s\n", hex.EncodeToString([]byte(arg))))
|
|
buf.WriteString(fmt.Sprintf("String to Base64\t%s\n", base64.StdEncoding.EncodeToString([]byte(arg))))
|
|
|
|
out := buf.Bytes()
|
|
buf = bytes.NewBuffer(nil)
|
|
w := tabwriter.NewWriter(buf, 0, 4, 4, '\t', 0)
|
|
if _, err := w.Write(out); err != nil {
|
|
return "", err
|
|
}
|
|
if err := w.Flush(); err != nil {
|
|
return "", err
|
|
}
|
|
return buf.String(), nil
|
|
}
|
|
|
|
func parseArgs(args []string) ([]stackitem.Item, error) {
|
|
items := make([]stackitem.Item, len(args))
|
|
for i, arg := range args {
|
|
var typ, value string
|
|
typeAndVal := strings.Split(arg, ":")
|
|
if len(typeAndVal) < 2 {
|
|
if typeAndVal[0] == boolFalse || typeAndVal[0] == boolTrue {
|
|
typ = boolType
|
|
} else if _, err := strconv.Atoi(typeAndVal[0]); err == nil {
|
|
typ = intType
|
|
} else {
|
|
typ = stringType
|
|
}
|
|
value = typeAndVal[0]
|
|
} else {
|
|
typ = typeAndVal[0]
|
|
value = typeAndVal[1]
|
|
}
|
|
|
|
switch typ {
|
|
case boolType:
|
|
if value == boolFalse {
|
|
items[i] = stackitem.NewBool(false)
|
|
} else if value == boolTrue {
|
|
items[i] = stackitem.NewBool(true)
|
|
} else {
|
|
return nil, fmt.Errorf("%w: invalid bool value", ErrInvalidParameter)
|
|
}
|
|
case intType:
|
|
val, err := strconv.ParseInt(value, 10, 64)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("%w: invalid integer value", ErrInvalidParameter)
|
|
}
|
|
items[i] = stackitem.NewBigInteger(big.NewInt(val))
|
|
case stringType:
|
|
items[i] = stackitem.NewByteArray([]byte(value))
|
|
}
|
|
}
|
|
|
|
return items, nil
|
|
}
|
|
|
|
const logo = `
|
|
_ ____________ __________ _ ____ ___
|
|
/ | / / ____/ __ \ / ____/ __ \ | | / / |/ /
|
|
/ |/ / __/ / / / /_____/ / __/ / / /____| | / / /|_/ /
|
|
/ /| / /___/ /_/ /_____/ /_/ / /_/ /_____/ |/ / / / /
|
|
/_/ |_/_____/\____/ \____/\____/ |___/_/ /_/
|
|
`
|
|
|
|
func printLogo(c *ishell.Shell) {
|
|
c.Print(logo)
|
|
c.Println()
|
|
c.Println()
|
|
}
|