mirror of
https://codeberg.org/madmo/rdebug.git
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143 lines
3.3 KiB
Go
143 lines
3.3 KiB
Go
// Helper script for remote gdb
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// Copyright (C) 2017 Moritz Bitsch
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package main
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import (
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"bufio"
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"flag"
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"fmt"
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"io"
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"os"
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"path"
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"strconv"
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"strings"
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"golang.org/x/crypto/ssh"
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)
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var (
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optUser = flag.String("user", "default", "username for ssh user")
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optPassword = flag.String("pass", "", "password")
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optGdbPort = flag.Uint("port", 10001, "remote gdb port to use")
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)
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func main() {
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flag.Usage = func() {
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fmt.Fprintf(os.Stderr, "Usage: %s [OPTIONS] hostname program args\n", os.Args[0])
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flag.PrintDefaults()
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}
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flag.Parse()
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if flag.NArg() < 2 {
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flag.Usage()
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os.Exit(2)
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}
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connection, err := createConnection(flag.Arg(0), *optUser, *optPassword)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Can't connect to host: %s", err.Error())
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os.Exit(1)
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}
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defer connection.Close()
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err = deployFile(connection, flag.Arg(1), "/tmp/"+path.Base(flag.Arg(1)), "0755")
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if err != nil {
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fmt.Fprintf(os.Stderr, "Can't deploy file: %s", err.Error())
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os.Exit(1)
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}
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session, err := startGDB(connection, "/tmp/"+path.Base(flag.Arg(1)))
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if err != nil {
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fmt.Fprintf(os.Stderr, "Can't start gdb: %s", err.Error())
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os.Exit(1)
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}
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defer session.Close()
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}
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func startGDB(client *ssh.Client, remoteCommand string) (*ssh.Session, error) {
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session, err := client.NewSession()
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if err != nil {
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return nil, err
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}
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output, err := session.StderrPipe()
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if err != nil {
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return nil, err
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}
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err = session.Start("exec nohup gdbserver --once :" + strconv.Itoa(int(*optGdbPort)) + " " + remoteCommand)
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if err != nil {
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return nil, err
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}
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reader := bufio.NewReader(output)
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for line, err := reader.ReadString('\n'); err == nil; line, err = reader.ReadString('\n') {
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if strings.HasPrefix(line, "Listening on port") {
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println(line)
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break
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}
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}
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return session, nil
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}
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func deployFile(client *ssh.Client, localPath, remotePath string, permissions string) error {
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fmt.Printf("Deploy: %s -> %s\n", localPath, remotePath)
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reader, err := os.Open(localPath)
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if err != nil {
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return err
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}
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defer reader.Close()
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st, err := reader.Stat()
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if err != nil {
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return err
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}
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session, err := client.NewSession()
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if err != nil {
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return err
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}
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defer session.Close()
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writer, _ := session.StdinPipe()
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go func() {
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fmt.Fprintf(writer, "C%s %d %s\n", permissions, st.Size(), path.Base(remotePath))
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io.Copy(writer, reader)
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writer.Write([]byte{0x00})
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writer.Close()
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}()
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return session.Run("/usr/bin/scp -t " + path.Dir(remotePath))
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}
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func createConnection(host string, username string, password string) (*ssh.Client, error) {
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config := &ssh.ClientConfig{
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User: username,
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Auth: []ssh.AuthMethod{
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ssh.Password(password),
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},
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HostKeyCallback: ssh.InsecureIgnoreHostKey(),
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}
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return ssh.Dial("tcp", host, config)
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}
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