Golang ssh并ping包

工作需要写了个Go小程序，需要ssh到host上，并执行ping包，检查host的网络是否通。简单版的如下：

package main

import (
	"fmt"
	"golang.org/x/crypto/ssh"
	"os"
)

func main() {
	// get ssh client
	addrPort := "10.42.10.11:22"
	client, err := ssh.Dial("tcp", addrPort, &ssh.ClientConfig{
		User:            "root",
		Auth:            []ssh.AuthMethod{ssh.Password("123456")},
		HostKeyCallback: ssh.InsecureIgnoreHostKey(),
	})
	if err != nil {
		fmt.Fprintf(os.Stdout, "Failed to get ssh client %v\n", err)
		os.Exit(0)
	}
	defer client.Close()

	// connect host
	session, err := client.NewSession()
	if err != nil {
		fmt.Fprintf(os.Stdout, "Failed to connect session \n")
		os.Exit(0)
	}
	defer session.Close()

	pingAccess := "ping -c 2 10.42.10.12 | grep '100% packet loss' | wc -l"
	result, err := session.Output(pingAccess)
	if err != nil || 49 == result[0] {
		fmt.Fprintf(os.Stdout, "Failed to ping result:%d, Err:%v \n", result[0], err)
		os.Exit(0)
	}
	//result is ASCII
	fmt.Fprintf(os.Stdout, "finish %d \n", result[0])
}

简单的说明：

1. 下载crypto源码git clone https://github.com/golang/crypto.git，把crypto文件夹拷贝到vendor/golang.org/x/目录下

2. 这里的ssh.InsecureIgnoreHostKey是不检查host key，需要检查的话得参考client源码重写函数。

3. session.run(command)是直接在host执行命令，不关心执行结果。session.Output是将执行命令之后的Stdout返回

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