使用 c 语言实现 webssh, 需包含前后端代码
时间: 2024-03-10 13:47:14 浏览: 172
实现 WebSSH 需要前后端的配合,前端负责页面的显示,后端负责与 SSH 服务器建立连接和数据传输。下面是一个简单的 C 语言实现 WebSSH 的示例,包含前后端代码:
前端代码(使用 HTML 和 JavaScript 实现):
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>WebSSH</title>
<style type="text/css">
#terminal {
font-family: monospace;
font-size: 12px;
width: 100%;
height: 300px;
background-color: #000;
color: #fff;
border: none;
resize: none;
overflow: auto;
}
</style>
</head>
<body>
<textarea id="terminal" readonly></textarea>
<input type="text" id="input" autofocus>
<script type="text/javascript">
var socket = new WebSocket("ws://localhost:8080");
var terminal = document.getElementById("terminal");
var input = document.getElementById("input");
socket.onopen = function(event) {
terminal.value += "Connected to server!\n";
};
socket.onmessage = function(event) {
terminal.value += event.data;
};
input.addEventListener("keydown", function(event) {
if (event.keyCode === 13) {
socket.send(input.value + "\n");
input.value = "";
}
});
</script>
</body>
</html>
```
后端代码(使用 C 语言和 libssh 库实现):
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libssh/libssh.h>
#include <libssh/server.h>
#define PORT 8080
#define BUFFER_SIZE 1024
int main() {
ssh_bind sshbind;
ssh_session sshsession;
ssh_channel sshchannel;
int sockfd, clientfd;
char buffer[BUFFER_SIZE];
// 初始化 libssh 库
ssh_init();
// 创建 SSH 服务器对象并绑定端口
sshbind = ssh_bind_new();
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT, &PORT);
// 监听端口并等待连接
if (ssh_bind_listen(sshbind) < 0) {
printf("Error listening to port %d: %s\n", PORT, ssh_get_error(sshbind));
exit(EXIT_FAILURE);
}
printf("Listening to port %d...\n", PORT);
// 接受客户端连接
sockfd = ssh_bind_accept(sshbind);
if (sockfd < 0) {
printf("Error accepting client: %s\n", ssh_get_error(sshbind));
exit(EXIT_FAILURE);
}
// 创建 SSH 会话对象
sshsession = ssh_new();
if (sshsession == NULL) {
printf("Error creating SSH session: %s\n", ssh_get_error(sshbind));
exit(EXIT_FAILURE);
}
// 将 SSH 会话对象与客户端连接绑定
if (ssh_bind_accept(sshbind) < 0) {
printf("Error accepting client: %s\n", ssh_get_error(sshbind));
exit(EXIT_FAILURE);
}
// 开始 SSH 会话
if (ssh_start_session(sshsession) < 0) {
printf("Error starting SSH session: %s\n", ssh_get_error(sshsession));
exit(EXIT_FAILURE);
}
// 打开 SSH 通道
sshchannel = ssh_channel_new(sshsession);
if (sshchannel == NULL) {
printf("Error creating SSH channel: %s\n", ssh_get_error(sshsession));
exit(EXIT_FAILURE);
}
// 请求 shell
if (ssh_channel_request_shell(sshchannel) < 0) {
printf("Error requesting shell: %s\n", ssh_get_error(sshchannel));
exit(EXIT_FAILURE);
}
// 读取客户端发送的数据并将结果返回给客户端
while (1) {
clientfd = accept(sockfd, NULL, NULL);
if (clientfd < 0) {
printf("Error accepting client: %s\n", ssh_get_error(sshbind));
exit(EXIT_FAILURE);
}
memset(buffer, 0, BUFFER_SIZE);
if (recv(clientfd, buffer, BUFFER_SIZE, 0) < 0) {
printf("Error receiving data: %s\n", ssh_get_error(sshchannel));
exit(EXIT_FAILURE);
}
if (ssh_channel_write(sshchannel, buffer, strlen(buffer)) < 0) {
printf("Error writing data: %s\n", ssh_get_error(sshchannel));
exit(EXIT_FAILURE);
}
memset(buffer, 0, BUFFER_SIZE);
if (ssh_channel_read(sshchannel, buffer, BUFFER_SIZE, 0) < 0) {
printf("Error reading data: %s\n", ssh_get_error(sshchannel));
exit(EXIT_FAILURE);
}
if (send(clientfd, buffer, strlen(buffer), 0) < 0) {
printf("Error sending data: %s\n", ssh_get_error(sshchannel));
exit(EXIT_FAILURE);
}
close(clientfd);
}
// 关闭 SSH 通道和 SSH 会话
ssh_channel_close(sshchannel);
ssh_channel_free(sshchannel);
ssh_finalize();
return 0;
}
```
注意:这只是一个简单的示例,实际生产环境中还需要考虑安全性和性能等因素。