152 lines
3.7 KiB
Go
152 lines
3.7 KiB
Go
package connection
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"net"
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"os"
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"path/filepath"
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"strconv"
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"github.com/rs/zerolog/log"
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"golang.org/x/crypto/ssh"
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)
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type SSHConn struct {
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addr string
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client *ssh.Client
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}
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var _ IConnection = (*SSHConn)(nil)
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var (
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ErrSSHDial = errors.New("unable to dial ssh addr")
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ErrSSHConn = errors.New("unable to establish a new connection")
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ErrSShCopy = errors.New("unable to copy file")
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ErrSSHSession = errors.New("unable to open a new session")
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ErrSSHReadPrivateKey = errors.New("unable to read private key")
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ErrSSHParsePrivateKey = errors.New("unable to read private key")
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ErrSSHExecute = errors.New("unable to execute command")
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)
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func NewSSHConn(addr, user string, port int, privkey string) (SSHConn, error) {
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var newconn SSHConn
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sshAddr := addr + ":" + strconv.Itoa(port)
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newconn.addr = sshAddr
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conn, err := net.Dial("tcp", sshAddr)
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if err != nil {
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return newconn, fmt.Errorf("%w, addr=%s, err=%v", ErrSSHDial, addr, err)
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}
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c, err := os.ReadFile(privkey)
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if err != nil {
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return newconn, fmt.Errorf("%w, privkey=%s, err=%v", ErrSSHReadPrivateKey, privkey, err)
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}
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sshPrivKey, err := ssh.ParsePrivateKey(c)
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if err != nil {
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return newconn, fmt.Errorf("%w, privkey=%s, err=%v", ErrSSHParsePrivateKey, privkey, err)
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}
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sshConfig := ssh.ClientConfig{
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User: user,
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HostKeyCallback: ssh.InsecureIgnoreHostKey(), //nolint:gosec // no need
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Auth: []ssh.AuthMethod{
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ssh.PublicKeys(sshPrivKey),
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},
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}
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sshConn, chNewChannel, chReq, err := ssh.NewClientConn(conn, sshAddr, &sshConfig)
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if err != nil {
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return newconn, fmt.Errorf("%w, addr=%s, err=%v", ErrSSHConn, sshAddr, err)
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}
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sshClient := ssh.NewClient(sshConn, chNewChannel, chReq)
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newconn.client = sshClient
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return newconn, nil
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}
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func (c *SSHConn) Close() error {
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return c.client.Close()
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}
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func (c *SSHConn) CopyFile(src, dest string) error {
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sshSession, err := c.client.NewSession()
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if err != nil {
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return fmt.Errorf("%w, addr=%s, err=%v", ErrSSHSession, c.addr, err)
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}
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defer sshSession.Close() //nolint: errcheck // defered
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fileInfo, err := os.Stat(src)
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if err != nil {
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return fmt.Errorf("unable to stat scp source file src=%s, err=%v", src, err)
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}
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file, err := os.Open(src)
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if err != nil {
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return fmt.Errorf("unable to open scp source file src=%s, err=%v", src, err)
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}
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defer file.Close() //nolint: errcheck // defered
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go func() {
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w, _ := sshSession.StdinPipe()
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defer w.Close() //nolint: errcheck // defered
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if _, err := fmt.Fprintf(w, "C0644 %d %s\n", fileInfo.Size(), filepath.Base(dest)); err != nil {
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log.Debug().
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Err(err).
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Str("src", src).
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Str("dest", dest).
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Msg("unable to write file info to scp")
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return
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}
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if _, err := io.Copy(w, file); err != nil {
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log.Debug().Err(err).Str("src", src).Str("dest", dest).Msg("unable to scp src to dest")
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return
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}
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if _, err := fmt.Fprint(w, "\x00"); err != nil {
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log.Debug().
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Err(err).
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Str("src", src).
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Str("dest", dest).
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Msg("unable to write scp termination string")
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}
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}()
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if err := sshSession.Run(fmt.Sprintf("scp -t %s", dest)); err != nil {
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return fmt.Errorf(
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"%w, addr=%s, src=%s, dest=%s, err=%v",
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ErrSShCopy,
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c.addr,
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src,
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dest,
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err,
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)
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}
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return nil
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}
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func (c *SSHConn) Execute(cmd string) (string, error) {
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sshSession, err := c.client.NewSession()
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if err != nil {
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return "", fmt.Errorf("%w, addr=%s, err=%v", ErrSSHSession, c.addr, err)
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}
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defer sshSession.Close() //nolint: errcheck // defered
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var buf bytes.Buffer
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sshSession.Stdout = &buf
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if err := sshSession.Run(cmd); err != nil {
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return "", fmt.Errorf("%w, addr=%s, cmd=%s, err=%v", ErrSSHExecute, c.addr, cmd, err)
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}
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return "", nil
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}
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