仿照 JSch官网JumpHosts示例代码 编写工具类
POM dependencies
- 需要注意的是，至本片文章编写之日，
JSch 版本 0.1.53 及以下都已发现 漏洞 。最新 0.1.55 无漏洞。
1
2
3
4
5
6
7
8
9
10
11
12
13
| <dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
</dependency>
<dependency>
<groupId>com.jcraft</groupId>
<artifactId>jsch</artifactId>
<version>0.1.55</version>
</dependency>
|
工具代码
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
| package jumphosts;
import cn.hutool.extra.ssh.JschUtil;
import com.jcraft.jsch.Session;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;
import java.nio.charset.StandardCharsets;
import java.util.List;
/**
* SSH映射
*
* @author https://github.com/youthred
*/
public class SshForward implements AutoCloseable {
private Session[] sessions;
private SshForward() {
}
public SshForward(Session[] sessions) {
this.sessions = sessions;
}
public SshForward(List<SshHost> hosts) {
this.sessions = SshUtil.getSessions(hosts);
}
/**
* 获取跳板机Session数组
* <p>
* [0]: first session
* [-1]: target session
*
* @return Session[]
*/
public Session[] getSessions() {
return sessions;
}
/**
* 获取目标主机Session
*
* @return target session
*/
public Session getTarget() {
if (ArrayUtils.isNotEmpty(sessions)) {
return sessions[sessions.length - 1];
}
return null;
}
/**
* 在目标主机上执行命令，并返回控制台打印信息
*
* @param cmd Linux命令
* @return 执行打印
*/
public String exec(String cmd) {
if (StringUtils.isNotBlank(cmd)) {
return JschUtil.exec(getTarget(), cmd, StandardCharsets.UTF_8);
}
return null;
}
/**
* 在目标主机上执行命令，并返回控制台打印信息
*
* @param cmds Linux命令
* @return 执行打印
*/
public String[] exec(String... cmds) {
if (ArrayUtils.isNotEmpty(cmds)) {
String[] resultPrints = new String[cmds.length];
for (int i = 0; i < cmds.length; i++) {
resultPrints[i] = JschUtil.exec(getTarget(), cmds[i], StandardCharsets.UTF_8);
}
return resultPrints;
}
return null;
}
/**
* 后入先出地依次关闭session连接
*/
@Override
public void close() {
if (ArrayUtils.isNotEmpty(sessions)) {
for (int i = sessions.length - 1; i >= 0; i--) {
try {
sessions[i].disconnect();
} catch (Throwable ignored) {
}
}
}
}
}
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
| package jumphosts;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import org.apache.commons.collections4.CollectionUtils;
import java.util.List;
/**
* @author https://github.com/youthred
*/
public class SshUtil {
public static Session[] getSessions(List<SshHost> hosts) {
if (CollectionUtils.isEmpty(hosts)) {
return null;
}
Session[] sessions = null;
try {
JSch jsch = new JSch();
// jsch.addIdentity("~/.ssh/id_rsa");
sessions = new Session[hosts.size()];
Session session = null;
for (int i = 0; i < hosts.size(); i++) {
SshHost host = hosts.get(i);
if (i == 0) {
session = jsch.getSession(host.getUsername(), host.getIp(), host.getPort());
} else {
int assignedPort = session.setPortForwardingL(0, host.getIp(), host.getPort());
session = jsch.getSession(host.getUsername(), "127.0.0.1", assignedPort);
}
session.setPassword(host.getPassword());
session.setConfig("StrictHostKeyChecking", "no");
session.connect();
sessions[i] = session;
}
} catch (JSchException e) {
e.printStackTrace();
}
return sessions;
}
}
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
| package jumphosts;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;
/**
* SSH 连接参数对象
*
* @author https://github.com/youthred
*/
@Data
@Accessors(chain = true)
@NoArgsConstructor
@AllArgsConstructor
public class SshHost {
private String ip;
private Integer port;
private String username;
private String password;
public SshHost(String ip, String username, String password) {
this(ip, 22, username, password);
}
}
|
使用
1
2
3
4
5
6
7
8
| List<SshHost> hosts = new ArrayList<>(3);
hosts.add(new SshHost("1.2.3.4", "u", "p"));
hosts.add(new SshHost("2.3.4.5", "u", "p"));
hosts.add(new SshHost("3.4.5.6", "u", "p"));
try (SshForward forward = new SshForward(hosts)) {
String[] exec = forward.exec("pwd", "ifconfig");
Arrays.stream(exec).forEach(System.out::println);
}
|