gossh
Golang ssh library
Example
package main
import (
"github.com/dynport/gossh"
"log"
)
// returns a function of type gossh.Writer func(...interface{})
// MakeLogger just adds a prefix (DEBUG, INFO, ERROR)
func MakeLogger(prefix string) gossh.Writer {
return func(args ...interface{}) {
log.Println((append([]interface{}{prefix}, args...))...)
}
}
func main() {
client := gossh.New("some.host", "user")
// my default agent authentication is used. use
// client.SetPassword("<secret>")
// client.SetPrivateKey("<PrivateKey path>") if not set this path will read this prv key:$HOME/.ssh/id_rsa
// for password authentication
client.DebugWriter = MakeLogger("DEBUG")
client.InfoWriter = MakeLogger("INFO ")
client.ErrorWriter = MakeLogger("ERROR")
defer client.Close()
rsp, e := client.Execute("uptime")
if e != nil {
client.ErrorWriter(e.Error())
}
client.InfoWriter(rsp.String())
rsp, e = client.Execute("echo -n $(cat /proc/loadavg); cat /does/not/exists")
if e != nil {
client.ErrorWriter(e.Error())
client.ErrorWriter("STDOUT: " + rsp.Stdout())
client.ErrorWriter("STDERR: " + rsp.Stderr())
}
}
Prints this result:
2013/08/25 00:31:40 DEBUG connecting some.host
2013/08/25 00:31:41 INFO [EXEC ] uptime
2013/08/25 00:31:41 DEBUG 22:31:41 up 375 days, 10:44, 0 users, load average: 0.09, 0.13, 0.22
2013/08/25 00:31:41 INFO => 0.944143
2013/08/25 00:31:41 INFO map[stdout:72 bytes stderr:0 bytes runtime:0.944202 status:0]
2013/08/25 00:31:41 DEBUG already connected
2013/08/25 00:31:41 INFO [EXEC ] echo -n $(cat /proc/loadavg); cat /does/not/exists
2013/08/25 00:31:41 DEBUG 0.09 0.13 0.22 1/455 23396
2013/08/25 00:31:41 ERROR cat: /does/not/exists
2013/08/25 00:31:41 ERROR : No such file or directory
2013/08/25 00:31:41 INFO => 0.067075
2013/08/25 00:31:41 ERROR Process exited with: 1. Reason was: ()
2013/08/25 00:31:41 ERROR STDOUT: 0.09 0.13 0.22 1/455 23396
2013/08/25 00:31:41 ERROR STDERR: cat: /does/not/exists: No such file or directory
Tunnelling HTTP Connections
For services not bound to the public interface of a machine, tunnelling is a quite nice SSH feature. It allows to use a
remote service like it is running at the local machine. This concept is used in the HTTP client returned by the
NewHttpClient function. It is a common net/http.Client, but all requests are sent through the SSH connection given.