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|
// radare - LGPL - Copyright 2015 - nibble
/*
Package r2pipe allows to call r2 commands from Go. A simple hello world would
look like the following snippet:
package main
import (
"fmt"
"github.com/radare/r2pipe-go"
)
func main() {
r2p, err := r2pipe.NewPipe("malloc://256")
if err != nil {
panic(err)
}
defer r2p.Close()
_, err = r2p.Cmd("w Hello World")
if err != nil {
panic(err)
}
buf, err := r2p.Cmd("ps")
if err != nil {
panic(err)
}
fmt.Println(buf)
}
*/
package r2pipe
import (
"bufio"
"bytes"
"encoding/json"
"fmt"
"io"
"os"
"os/exec"
"strconv"
"strings"
"unsafe"
)
// A Pipe represents a communication interface with r2 that will be used to
// execute commands and obtain their results.
type Pipe struct {
File string
r2cmd *exec.Cmd
stdin io.WriteCloser
stdout io.ReadCloser
stderr io.ReadCloser
Core unsafe.Pointer
cmd CmdDelegate
close CloseDelegate
}
type (
CmdDelegate func(*Pipe, string) (string, error)
CloseDelegate func(*Pipe) error
EventDelegate func(*Pipe, string, interface{}, string) bool
)
// NewPipe returns a new r2 pipe and initializes an r2 core that will try to
// load the provided file or URI. If file is an empty string, the env vars
// R2PIPE_{IN,OUT} will be used as file descriptors for input and output, this
// is the case when r2pipe is called within r2.
func NewPipe(file string) (*Pipe, error) {
if file == "" {
return newPipeFd()
}
return newPipeCmd(file)
}
func newPipeFd() (*Pipe, error) {
r2pipeIn := os.Getenv("R2PIPE_IN")
r2pipeOut := os.Getenv("R2PIPE_OUT")
if r2pipeIn == "" || r2pipeOut == "" {
return nil, fmt.Errorf("missing R2PIPE_{IN,OUT} vars")
}
r2pipeInFd, err := strconv.Atoi(r2pipeIn)
if err != nil {
return nil, fmt.Errorf("failed to convert IN into file descriptor")
}
r2pipeOutFd, err := strconv.Atoi(r2pipeOut)
if err != nil {
return nil, fmt.Errorf("failed to convert OUT into file descriptor")
}
stdout := os.NewFile(uintptr(r2pipeInFd), "R2PIPE_IN")
stdin := os.NewFile(uintptr(r2pipeOutFd), "R2PIPE_OUT")
r2p := &Pipe{
File: "",
r2cmd: nil,
stdin: stdin,
stdout: stdout,
Core: nil,
}
return r2p, nil
}
func newPipeCmd(file string) (*Pipe, error) {
r2p := &Pipe{File: file, r2cmd: exec.Command("radare2", "-q0", file)}
var err error
r2p.stdin, err = r2p.r2cmd.StdinPipe()
if err == nil {
r2p.stdout, err = r2p.r2cmd.StdoutPipe()
if err == nil {
r2p.stderr, err = r2p.r2cmd.StdoutPipe()
}
if err = r2p.r2cmd.Start(); err == nil {
//Read the initial data
_, err = bufio.NewReader(r2p.stdout).ReadString('\x00')
}
}
return r2p, err
}
// Write implements the standard Write interface: it writes data to the r2
// pipe, blocking until r2 have consumed all the data.
func (r2p *Pipe) Write(p []byte) (n int, err error) {
return r2p.stdin.Write(p)
}
// Read implements the standard Read interface: it reads data from the r2
// pipe's stdin, blocking until the previously issued commands have finished.
func (r2p *Pipe) Read(p []byte) (n int, err error) {
return r2p.stdout.Read(p)
}
func (r2p *Pipe) ReadErr(p []byte) (n int, err error) {
return r2p.stderr.Read(p)
}
func (r2p *Pipe) On(evname string, p interface{}, cb EventDelegate) error {
path, err := r2p.Cmd("===stderr")
if err != nil {
return err
}
f, err := os.OpenFile(path, os.O_RDONLY, 0600)
if err != nil {
return err
}
go func() {
var buf bytes.Buffer
for {
io.Copy(&buf, f)
if buf.Len() > 0 {
if !cb(r2p, evname, p, buf.String()) {
break
}
}
}
f.Close()
}()
return nil
}
// Cmd is a helper that allows to run r2 commands and receive their output.
func (r2p *Pipe) Cmd(cmd string) (string, error) {
if r2p.Core != nil {
if r2p.cmd != nil {
return r2p.cmd(r2p, cmd)
}
return "", nil
}
if _, err := fmt.Fprintln(r2p, cmd); err != nil {
return "", err
}
buf, err := bufio.NewReader(r2p).ReadString('\x00')
if err != nil {
return "", err
}
return strings.TrimRight(buf, "\n\x00"), err
}
//like cmd but formats the command
func (r2p *Pipe) Cmdf(f string, args ...interface{}) (string, error) {
return r2p.Cmd(fmt.Sprintf(f, args...))
}
// Cmdj acts like Cmd but interprets the output of the command as json. It
// returns the parsed json keys and values.
func (r2p *Pipe) Cmdj(cmd string) (out interface{}, err error) {
rstr, err := r2p.Cmd(cmd)
if err == nil {
err = json.Unmarshal([]byte(rstr), out)
}
return out, err
}
//like cmdj but formats the command
func (r2p *Pipe) Cmdjf(f string, args ...interface{}) (interface{}, error) {
return r2p.Cmdj(fmt.Sprintf(f, args...))
}
// Close shuts down r2, closing the created pipe.
func (r2p *Pipe) Close() error {
if r2p.close != nil {
return r2p.close(r2p)
}
if r2p.File == "" {
return nil
}
if _, err := r2p.Cmd("q"); err != nil {
return err
}
return r2p.r2cmd.Wait()
}
// Forcing shutdown of r2, closing the created pipe.
func (r2p *Pipe) ForceClose() error {
if r2p.close != nil {
return r2p.close(r2p)
}
if r2p.File == "" {
return nil
}
if _, err := r2p.Cmd("q!"); err != nil {
return err
}
return r2p.r2cmd.Wait()
}
|
