qt使用libssh2实现ssh客户端并发送命令实例
时间: 2024-05-05 13:21:44 浏览: 19
下面是一个使用libssh2实现SSH客户端并发送命令的示例:
1. 首先需要安装libssh2库,可以在Ubuntu下使用以下命令进行安装:
```
sudo apt-get install libssh2-1-dev
```
2. 然后创建一个Qt项目,并在.pro文件中添加以下内容:
```
LIBS += -lssh2
```
3. 在Qt中创建一个类,例如名为SSHClient的类,并在其中添加以下代码:
```
#include <libssh2.h>
#include <QByteArray>
class SSHClient
{
public:
SSHClient(const QString &host, const QString &user, const QString &password);
~SSHClient();
bool connect();
void disconnect();
QString execute(const QString &command);
private:
QString m_host;
QString m_user;
QString m_password;
LIBSSH2_SESSION *m_session;
LIBSSH2_CHANNEL *m_channel;
};
SSHClient::SSHClient(const QString &host, const QString &user, const QString &password)
: m_host(host), m_user(user), m_password(password), m_session(nullptr), m_channel(nullptr)
{
}
SSHClient::~SSHClient()
{
disconnect();
}
bool SSHClient::connect()
{
m_session = libssh2_session_init_ex(nullptr, nullptr, nullptr, this);
if (!m_session) {
qWarning("Failed to initialize SSH session.");
return false;
}
libssh2_session_set_blocking(m_session, 1);
int rc = libssh2_session_handshake(m_session, m_socket);
if (rc) {
qWarning("Failed to establish SSH session: %d", rc);
return false;
}
rc = libssh2_userauth_password(m_session, m_user.toUtf8().constData(), m_password.toUtf8().constData());
if (rc) {
qWarning("Failed to authenticate SSH session: %d", rc);
return false;
}
return true;
}
void SSHClient::disconnect()
{
if (m_channel) {
libssh2_channel_free(m_channel);
m_channel = nullptr;
}
if (m_session) {
libssh2_session_disconnect(m_session, "Normal Shutdown");
libssh2_session_free(m_session);
m_session = nullptr;
}
}
QString SSHClient::execute(const QString &command)
{
if (!m_session) {
qWarning("SSH session is not established.");
return "";
}
m_channel = libssh2_channel_open_session(m_session);
if (!m_channel) {
qWarning("Failed to open SSH channel.");
return "";
}
int rc = libssh2_channel_exec(m_channel, command.toUtf8().constData());
if (rc) {
qWarning("Failed to execute SSH command: %d", rc);
return "";
}
QByteArray result;
char buf[1024];
while (true) {
int nbytes = libssh2_channel_read(m_channel, buf, sizeof(buf));
if (nbytes > 0) {
result.append(buf, nbytes);
}
else if (nbytes < 0) {
qWarning("Failed to read SSH result: %d", nbytes);
break;
}
else {
break;
}
}
libssh2_channel_free(m_channel);
m_channel = nullptr;
return QString::fromUtf8(result);
}
```
4. 在主窗口中可以使用以下代码进行测试:
```
SSHClient ssh("localhost", "username", "password");
if (ssh.connect()) {
QString result = ssh.execute("ls");
qDebug() << result;
ssh.disconnect();
}
```
这个示例中创建了一个SSHClient类,该类具有connect()、disconnect()和execute()方法。connect()方法用于与SSH服务器建立连接,disconnect()方法用于断开连接,execute()方法用于执行命令并返回结果。在主窗口中可以创建SSHClient对象,并使用execute()方法发送命令并打印结果。
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