merlynee opened a new issue, #490:
URL: https://github.com/apache/mina-sshd/issues/490
### Version
2.12.1
### Bug description
I use sshd-core to execute the hostname . But sometimes I got twice of the
result. When this result appears , it usually report:
handleEof(ChannelExec[id=0,
recipient=1]-ClientSessionImpl[root@/10.253.146.1:22]) already signalled.
I tested for several times and it happens once outof twenty or thirty times.
My code is like following：
public String testGetHostName(@RequestParam String ip,
@RequestParam int port,
@RequestParam String username,
@RequestParam String pwd) {
for (int i = 0; i < 50; i++) {
SSHUitls.execCommand(ip, username, pwd, port, "hostname", i);
}
return SSHUitls.execCommand(ip, username, pwd, port, "hostname",51);
}
@Slf4j
public class SSHUitls {
public synchronized static String execCommand(@NonNull String ip,
@NonNull String username, @NonNull String pass, int port, String cmd, int
count) {
ClientSession session = null;
ChannelExec shellChannelExec = null;
ByteArrayOutputStream output = new ByteArrayOutputStream();
ByteArrayOutputStream outputErr = new ByteArrayOutputStream();
SshClient client = SshClient.setUpDefaultClient();
try {
log.info("destin:{} cmd:{}", ip, cmd);
client.setServerKeyVerifier(AcceptAllServerKeyVerifier.INSTANCE);
client.start();
ConnectFuture cf = client.connect(username, ip, port);
session = cf.verify().getSession();
session.addPasswordIdentity(pass);
session.auth().verify(TimeUnit.SECONDS.toMillis(50));
shellChannelExec = session.createExecChannel(cmd);
shellChannelExec.setOut(output);
shellChannelExec.setErr(outputErr);
log.info("createExecChannel time：" + LocalDateTime.now());
shellChannelExec.open().verify(15L, TimeUnit.SECONDS);
log.info("exec during：" + LocalDateTime.now());
shellChannelExec.open();
shellChannelExec.waitFor(EnumSet.of(ClientChannelEvent.CLOSED), 0);
shellChannelExec.setOut(null);
log.info("destin:{} cmd:{} error:{} standred{}", ip, cmd,
outputErr, output);
String outputStr = output.toString();
String[] splitStr = outputStr.split("\\n");
try{
Thread.sleep(300);
}catch (InterruptedException e){
e.printStackTrace();
}
if (splitStr.length > 1) {
log.error("duplicate happens:" + count);
}
return output.toString();
} catch (Exception e) {
log.error("exec error:{}", e.getMessage());
} finally {
if (shellChannelExec != null) {
try {
shellChannelExec.close();
} catch (Exception e) {
log.error("shellChannelExec disconnect error:", e);
}
}
try {
output.close();
} catch (Exception e) {
log.error("shellStream close error:", e);
}
try {
outputErr.close();
} catch (Exception e) {
log.error("shellErrStream close error:", e);
}
}
return "";
}
}
With the logs following:
So much apreciate it if someone could spare your time to help！
### Actual behavior
Got twice of the result,when I apply for hostname frequently.
### Expected behavior
To get the result onece.Or I can get the Exception or Callback
### Relevant log output
_No response_
### Other information
_No response_
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