/
main.go
179 lines (154 loc) · 3.52 KB
/
main.go
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package main
import (
"bytes"
"flag"
"fmt"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
"io/ioutil"
"log"
"net"
"os"
"os/user"
"path"
"strings"
"time"
"sync/atomic"
)
var (
userarg = flag.String("user", "", "optional username to use")
hostsarg = flag.String("hosts", "", "comma seperated list of hosts")
timeoutarg = flag.Int64("timeout", 90, "timeout in seconds")
timeout = time.After(90 * time.Second)
results = make(chan []string, 10)
hostsfilearg = flag.String("g", "", "")
bufferout = flag.Bool("buffer", false, "")
)
var errCount uint64
func osUsername() (string, string, error) {
u, err := user.Current()
if err != nil {
return "", "", err
}
return u.Username, u.HomeDir, nil
}
type agentAuths struct {
c net.Conn
a agent.Agent
auths []ssh.AuthMethod
}
func getAgentAuths() *agentAuths {
conn, err := net.Dial("unix", os.Getenv("SSH_AUTH_SOCK"))
if err != nil {
log.Fatal(err)
}
ac := agent.NewClient(conn)
aa := &agentAuths{
c: conn,
a: ac,
auths: []ssh.AuthMethod{ssh.PublicKeysCallback(ac.Signers)},
}
return aa
}
func execCmd(cmd, hostname, username string, agent *agentAuths, buffer *bool) []string {
config := &ssh.ClientConfig{
User: username,
Auth: agent.auths,
}
if strings.Contains(hostname, "@") {
config.User = strings.Split(hostname, "@")[0]
hostname = strings.Split(hostname, "@")[1]
}
conn, err := ssh.Dial("tcp", fmt.Sprintf("%s:22", hostname), config)
if err != nil {
atomic.AddUint64(&errCount, 1)
return []string{fmt.Sprintf("%s error: %s", hostname, err)}
}
session, err := conn.NewSession()
if err != nil {
atomic.AddUint64(&errCount, 1)
return []string{fmt.Sprintf("%s error: %s", hostname, err)}
}
defer session.Close()
if !*bufferout {
session.Stdout = os.Stdout
session.Stderr = os.Stderr
err = session.Run(cmd)
if err != nil {
atomic.AddUint64(&errCount, 1)
return []string{fmt.Sprintf("%s error: %s", hostname, err)}
}
return []string{}
}
var out bytes.Buffer
session.Stdout = &out
session.Stderr = &out
err = session.Run(cmd)
if err != nil {
atomic.AddUint64(&errCount, 1)
return []string{fmt.Sprintf("%s error: %s", hostname, err)}
}
splitout := strings.Split(strings.TrimSpace(out.String()), "\n")
resp := make([]string, len(splitout))
for i, l := range splitout {
resp[i] = fmt.Sprintf("%s: %s", hostname, l)
}
return resp
}
func loadHostsFile(shortname string) []string {
usr, _ := user.Current()
file := path.Join(usr.HomeDir, ".gsh", shortname)
buf, err := ioutil.ReadFile(file)
if err != nil {
log.Fatal(err)
}
hosts := strings.Split(strings.TrimSpace(string(buf)), "\n")
return hosts
}
func main() {
flag.Parse()
errCount = 0
username, _, err := osUsername()
if err != nil {
log.Fatal(err)
}
if *hostsarg == "" {
if *hostsfilearg == "" {
flag.Usage()
return
}
}
hosts := strings.Split(*hostsarg, ",")
if *hostsfilearg != "" {
hosts = loadHostsFile(*hostsfilearg)
}
if len(hosts) == 0 {
flag.Usage()
return
}
if *userarg != "" {
username = *userarg
}
cmd := flag.Args()
agent := getAgentAuths()
defer agent.c.Close()
for _, hostname := range hosts {
go func(hostname string) {
results <- execCmd(strings.Join(cmd, " "), hostname, username, agent, bufferout)
}(hostname)
}
for i := 0; i < len(hosts); i++ {
select {
case res := <-results:
for _, l := range res {
fmt.Println(l)
}
case <-timeout:
fmt.Println("!! - Timed out - !!")
return
}
}
if atomic.LoadUint64(&errCount) != 1 {
os.Exit(1)
}
}