Tiny telnet client for sending commands to remote server.
Client does passing authorization and parsing of command result.
package main
import (
"fmt"
"github.com/tanjmaxalb/telnet-client"
)
func main() {
tc := telnet.TelnetClient{
Address: "127.0.0.1",
Login: "user",
Password: "P@ssw0rd",
}
err := tc.Dial()
if err != nil {
fmt.Printf("failed open connect with error = %v\n", err)
return
}
defer tc.Close()
stdout, err := tc.Execute("arp -a")
if err != nil {
fmt.Printf("failed execute command with error = %v\n", err)
return
}
fmt.Printf(string(stdout))
}After executing the following content will appear:
arp -a
? (192.168.1.145) at 70:85:c2:6c:e8:a3 [ether] on br0
? (192.168.1.193) at f8:63:3f:8a:3e:e6 [ether] on br0
? (192.168.1.216) at 40:e2:30:0e:3e:99 [ether] on br0
? (192.168.1.162) at b8:27:eb:1c:3c:34 [ether] on br0
? (192.168.1.144) at 70:85:c2:6c:e8:a3 [ether] on br0
? (77.106.87.1) at f8:f0:82:75:5a:7d [ether] on vlan2
? (192.168.1.20) at 94:65:2d:d3:0f:22 [ether] on br0
? (192.168.1.87) at 70:bb:e9:ee:d4:bb [ether] on br0
user-77-106-87-53.tomtelnet.ru (77.106.87.53) at f8:f0:82:75:5a:7d [ether] on vlan2
? (192.168.1.207) at <incomplete> on br0
You can set Verbose parameter for internal logging and override log stream via LogWriter parameter.
By default, logger write to os.Stdout.
tc := telnet.TelnetClient{
Address: "127.0.0.1",
Login: "user",
Password: "P@ssw0rd",
Verbose: true,
LogWriter: bufio.NewWriter(log.Writer()),
}So you will see following lines:
telnet: Trying connect to 192.168.1.1:23
telnet: Waiting for the first banner
telnet: Found login prompt
telnet: Found password prompt
telnet: Send command: arp -a
telnet: Received data with size = 584
arp -a
? (192.168.1.145) at 70:85:c2:6c:e8:a3 [ether] on br0
? (192.168.1.193) at f8:63:3f:8a:3e:e6 [ether] on br0
...
You can set Delimeter, LoginRe, PasswordRe,BannerRe parameters to customize telnet client as you wants.
tc := telnet.TelnetClient{
...
Delimeter: ':',
LoginRe: regexp.MustCompile("Login:"),
PasswordRe: regexp.MustCompile("Password:"),
BannerRe: regexp.MustCompile("\\(config\\)>"),
}