79 lines
1.7 KiB
Go
79 lines
1.7 KiB
Go
package ssh
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import (
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"bytes"
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"errors"
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"io"
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"net"
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"golang.org/x/crypto/ssh"
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"github.com/FreifunkBremen/freifunkmanager/lib/log"
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)
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type SSHResultHandler func([]byte, error)
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type SSHResultStringHandler func(string, error)
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func SSHResultToString(result []byte) string {
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if len(result) > 0 {
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result = result[:len(result)-1]
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}
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return string(result)
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}
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func SSHResultToStringHandler(handler SSHResultStringHandler) SSHResultHandler {
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return func(result []byte, err error) {
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handler(SSHResultToString(result), err)
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}
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}
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func (m *Manager) RunEverywhere(cmd string, handler SSHResultHandler) {
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for host, client := range m.clients {
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result, err := m.run(host, client, cmd)
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handler(result, err)
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}
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}
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func (m *Manager) RunOn(addr net.TCPAddr, cmd string) ([]byte, error) {
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client := m.ConnectTo(addr)
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if client != nil {
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return m.run(addr.IP.String(), client, cmd)
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}
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return nil, errors.New("no connection for runOn")
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}
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func (m *Manager) run(host string, client *ssh.Client, cmd string) ([]byte, error) {
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session, err := client.NewSession()
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defer session.Close()
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if err != nil {
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log.Log.Warnf("can not create session on %s: %s", host, err)
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delete(m.clients, host)
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return nil, err
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}
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stdout, err := session.StdoutPipe()
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buffer := &bytes.Buffer{}
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go io.Copy(buffer, stdout)
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if err != nil {
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log.Log.Warnf("can not create pipe for run on %s: %s", host, err)
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delete(m.clients, host)
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return nil, err
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}
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err = session.Run(cmd)
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if err != nil {
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log.Log.Warnf("could not run %s on %s: %s", cmd, host, err)
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delete(m.clients, host)
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return nil, err
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}
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var result []byte
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for {
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b, err := buffer.ReadByte()
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if err != nil {
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break
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}
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result = append(result, b)
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}
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return result, nil
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}
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