125 lines
2.5 KiB
Go
125 lines
2.5 KiB
Go
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package sshcommand
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import (
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"fmt"
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"runtime"
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"strings"
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)
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// Command contains settings to build a ssh command
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type Command struct {
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Host string
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User string
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Port int
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SSHOptions []string
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Gateway *Command
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Command []string
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Debug bool
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NoEscapeCommand bool
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SkipHostKeyChecking bool
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Quiet bool
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AllocateTTY bool
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EnableSSHKeyForwarding bool
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isGateway bool
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}
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// New returns a minimal Command
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func New(host string) *Command {
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return &Command{
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Host: host,
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}
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}
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func (c *Command) applyDefaults() {
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if strings.Contains(c.Host, "@") {
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parts := strings.Split(c.Host, "@")
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c.User = parts[0]
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c.Host = parts[1]
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}
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if c.Port == 0 {
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c.Port = 22
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}
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if c.isGateway {
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c.SSHOptions = []string{"-W", "%h:%p"}
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}
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}
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// Slice returns an execve compatible slice of arguments
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func (c *Command) Slice() []string {
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c.applyDefaults()
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slice := []string{}
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slice = append(slice, "ssh")
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if c.EnableSSHKeyForwarding {
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slice = append(slice, "-A")
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}
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if c.Quiet {
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slice = append(slice, "-q")
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}
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if c.SkipHostKeyChecking {
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slice = append(slice, "-o", "UserKnownHostsFile=/dev/null", "-o", "StrictHostKeyChecking=no")
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}
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if len(c.SSHOptions) > 0 {
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slice = append(slice, c.SSHOptions...)
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}
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if c.Gateway != nil {
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c.Gateway.isGateway = true
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slice = append(slice, "-o", "ProxyCommand="+c.Gateway.String())
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}
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if c.User != "" {
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slice = append(slice, "-l", c.User)
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}
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slice = append(slice, c.Host)
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if c.AllocateTTY {
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slice = append(slice, "-t", "-t")
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}
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slice = append(slice, "-p", fmt.Sprintf("%d", c.Port))
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if len(c.Command) > 0 {
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slice = append(slice, "--", "/bin/sh", "-e")
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if c.Debug {
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slice = append(slice, "-x")
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}
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slice = append(slice, "-c")
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var escapedCommand []string
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if c.NoEscapeCommand {
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escapedCommand = c.Command
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} else {
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escapedCommand = []string{}
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for _, part := range c.Command {
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escapedCommand = append(escapedCommand, fmt.Sprintf("%q", part))
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}
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}
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slice = append(slice, fmt.Sprintf("%q", strings.Join(escapedCommand, " ")))
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}
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if runtime.GOOS == "windows" {
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slice[len(slice)-1] = slice[len(slice)-1] + " " // Why ?
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}
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return slice
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}
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// String returns a copy-pasteable command, useful for debugging
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func (c *Command) String() string {
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slice := c.Slice()
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for i := range slice {
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quoted := fmt.Sprintf("%q", slice[i])
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if strings.Contains(slice[i], " ") || len(quoted) != len(slice[i])+2 {
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slice[i] = quoted
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}
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}
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return strings.Join(slice, " ")
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}
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