BMC lighttpd kvm数据分析(websocket)
1.说明
lighttpd源码: https://github.com/lighttpd/lighttpd1.4.gitlighttpd wiki: https://redmine.lighttpd.net/projects/lighttpd/wiki/libfcgi: https://github.com/toshic/libfcgi/tree/master
注意:
- 本章的代码仓库: https://gitee.com/wit_yuan/lighttpd_kvm
2.编译
2.1 lighttpd编译与web访问
lighttpd编译方法，可以参考文档:https://github.com/lighttpd/lighttpd1.4/blob/master/INSTALL,命令如下:
$ cd lighttpd-1.4.xx$ ./autogen.sh$ ./configure -C$ make check$ /usr/bin/sudo make install
安装后文件路径:
$ ls /usr/local/sbin/lighttpd* -al
-rwxr-xr-x 1 root root 2023608 8月 30 16:45 /usr/local/sbin/lighttpd
-rwxr-xr-x 1 root root 23080 8月 30 16:45 /usr/local/sbin/lighttpd-angel
配置文件lighttpd.conf，使用:https://github.com/lighttpd/lighttpd1.4/blob/master/doc/config/lighttpd.conf。配置文件:modules.conf,使用https://github.com/lighttpd/lighttpd1.4/blob/master/doc/config/modules.conf。/etc/lighttpd/conf.d/access_log.conf使用https://github.com/lighttpd/lighttpd1.4/tree/master/doc/config/conf.d。
注释掉/etc/lighttpd/lighttpd.conf:
#server.username = "lighttpd"
#server.groupname = "lighttpd"
修改/etc/lighttpd/lighttpd.conf内容:
server.document-root = "/home/wityuan/Desktop/lighttpd/lighttpd1.4-lighttpd-1.4.76/www
server.port = 8080
server.bind = "localhost"
在目录:/home/wityuan/Desktop/lighttpd/lighttpd1.4-lighttpd-1.4.76/www中添加test.html,内容:
<!DOCTYPE html>
<html><head> <title> first website </title></head><body> <h1> welcome</h1> <p>this is a param.</p></body>
</html>
执行命令：
$ sudo mkdir /var/log/lighttpd
$ sudo touch /var/log/lighttpd/error.log
启动lighttpd:
# sudo /usr/local/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
启动成功:
网络访问:
http://127.0.0.1:8080/test.html
- 备注：
这一篇的文件配置可以参考文档: https://redmine.lighttpd.net/projects/lighttpd/wiki/InstallFromSource
2.2 libfcgi下载与编译测试
从网站https://github.com/toshic/libfcgi/tree/master下载代码。
编译，使用命令:
$ ./configure
$ make
$ sudo make install
如果编译不过去，修改文件examples/Makefile.in中的内容:
echo_cpp_LDADD = $(LIBDIR)/libfcgi++.la
改为:
echo_cpp_LDADD = $(LIBDIR)/libfcgi++.la $(LIBDIR)/libfcgi.la
最后，编译生成的目录信息如下:
编写程序文件cgitest1.c：
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <alloca.h>
#include <fcgiapp.h>
#define LISTENSOCK_FILENO 0
#define LISTENSOCK_FLAGS 0
int main(int argc, char** argv) {openlog("testfastcgi", LOG_CONS|LOG_NDELAY, LOG_USER);int err = FCGX_Init(); /* call before Accept in multithreaded apps */if (err) { syslog (LOG_INFO, "FCGX_Init failed: %d", err); return 1; }FCGX_Request cgi;err = FCGX_InitRequest(&cgi, LISTENSOCK_FILENO, LISTENSOCK_FLAGS);if (err) { syslog(LOG_INFO, "FCGX_InitRequest failed: %d", err); return 2; }while (1) {err = FCGX_Accept_r(&cgi);if (err) { syslog(LOG_INFO, "FCGX_Accept_r stopped: %d", err); break; }char** envp;int size = 200;for (envp = cgi.envp; *envp; ++envp) size += strlen(*envp) + 11;char* result = (char*) alloca(size);strcpy(result, "Status: 200 OK\r\nContent-Type: text/html\r\n\r\n");strcat(result, "<html><head><title>testcgi</title></head><body><ul>\r\n");for (envp = cgi.envp; *envp; ++envp) {strcat(result, "<li>"); strcat(result, *envp); strcat(result, "</li>\r\n");}strcat(result, "</ul></body></html>\r\n");FCGX_PutStr(result, strlen(result), cgi.out);}return 0;
}
编译命令:
# gcc cgitest1.c -o cgitest1 -lfcgi
修改文件/etc/lighttpd/modules.conf,增加内容:
...
server.modules += ("mod_fastcgi")
fastcgi.debug = 1
fastcgi.server += ("/cgi" =>
((
"bin-path" => "/home/wityuan/Desktop/lighttpd/cgicode/cgitest1",
"max-procs" => 1,
"socket" => "/tmp/fcgi_test.socket",
"check-local" => "disable",
"allow-x-send-file" => "enable"
)))
...
注意:
- 1.如果运行报错:
$ /usr/local/bin/cgi-fcgi
/usr/local/bin/cgi-fcgi: error while loading shared libraries: libfcgi.so.0: cannot open shared object file: No such file or directory
可以参考:https://serverfault.com/questions/120233/how-to-configure-fastcgi-to-work-with-ligttpd-in-ubuntu
解决办法:
export LD_LIBRARY_PATH=/usr/local/lib
- 2.如果运行报错:
2024-08-30 23:59:14: (gw_backend.c.676) gw-backend failed to start: /xx/cgitest1
2024-08-30 23:59:14: (gw_backend.c.678) If you're trying to run your app as a FastCGI backend, make sure you're using the FastCGI-enabled version. If this is PHP on Gentoo, add 'fastcgi' to the USE flags. If this is PHP, try removing the bytecode caches for now and try again.
可以执行命令:
$ sudo ldconfig
重启lighttd服务器，可以看到有2个进程:
访问资源，截图如下:
2.3 websocket
2.3.1 资源
websocket的资源参考如下:
js创建websocket:https://websockets.spec.whatwg.org/#the-websocket-interfacewebsocket api:https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_APIwebsocket-6455官方文档:https://datatracker.ietf.org/doc/html/rfc6455
实际上，如上内容均在lighttpd中可以看到:
- https://redmine.lighttpd.net/projects/lighttpd/wiki/WebSockets
2.3.2 websocket js与后台程序通信
这里会用到网站所说的mod_wstunnel的功能:
mod_wstunnel is a WebSocket tunnel endpoint, terminating the websocket tunnel from a client. mod_wstunnel decodes websocket frames and then passes data (without websocket frames) to a backend, and in the opposite direction encodes responses from backend into websocket frames before sending responses to client.
1.配置stunnel
在文件/etc/lighttpd/modules.conf 中新增mod_wstunnel的配置:
..,
server.modules += ("mod_wstunnel")
$HTTP["url"] =~ "^/websocket" {wstunnel.server = ("" => (("host" => "127.0.0.1","port" => "8081")))wstunnel.frame-type = "text"
}
...
然后编写一个后台的server程序，内容如下:
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>// Should be same with the one in lihttpd.conf and index.html.
#define DEFAULT_PORT 8081
// Should be same with the one in lihttpd.conf.
#define DEFAULT_IP "127.0.0.1"int main(int argc, char **argv)
{int server_socket = -1;int client_socket = -1;struct sockaddr_in server_addr;struct sockaddr_in client_addr;char received_buffer[1024]; // Buffer for received.int received_len = -1;int sended_len = -1;int res = -1;socklen_t addr_len = sizeof(struct sockaddr);int index;// Create a socket.server_socket = socket(AF_INET, SOCK_STREAM, 0);if (server_socket < 0){printf("Create socket failed: %s\n", strerror(errno));return -1;}// Bind the created socket on special IP and port.server_addr.sin_family = AF_INET;server_addr.sin_port = htons(DEFAULT_PORT);server_addr.sin_addr.s_addr = inet_addr(DEFAULT_IP);if (bind(server_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0){printf("Bind server failed: %s\n", strerror(errno));return -2;}printf("Socket[%d] has bond on port[%d] for IP address[%s]!\n",server_socket, DEFAULT_PORT, DEFAULT_IP);// Listen on the created socket.listen(server_socket, 10);while (1){printf("Waiting and accept new client connect...\n");client_socket = accept(server_socket, (struct sockaddr *)&client_addr, &addr_len);if (client_socket < 0){printf("Accept client socket failed: %s\n", strerror(errno));return -3;}printf("Accept new client[%d] socket[%s:%d]\n", client_socket,inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));while (1){memset(received_buffer, 0, sizeof(received_buffer));received_len = read(client_socket, received_buffer, sizeof(received_buffer));if (received_len < 0){printf("Read data from client [%d] failed: %s\n", client_socket, strerror(errno));close(client_socket);break;}else if (0 == received_len){printf("Client [%d] disconnected!\n", client_socket);close(client_socket);break;}else{printf("Read %d bytes from client[%d] and the data is : %s\n",received_len, client_socket, received_buffer);// Send back the received buffer to client.sended_len = write(client_socket, received_buffer, received_len);if (sended_len < 0){printf("wWite data back to client[%d] failed: %s \n", client_socket,strerror(errno));close(client_socket);break;}}}sleep(1);}if (client_socket){close(client_socket);}close(server_socket);return 1;
}
编译，执行程序:
# gcc server1.c -o server1
# ./server1
web端js程序命名lighttpd1.4-lighttpd-1.4.76/www/websocket.js,内容如下:
// 获取按钮和文本框元素const sendBtn = document.getElementById('sendBtn');const messageBox = document.getElementById('messageBox');// 创建 WebSocket 对象const socket = new WebSocket('ws://127.0.0.1:8080/websocket'); // 使用一个 WebSocket 服务器进行测试// 设置 WebSocket 连接打开时的回调函数socket.onopen = function() {console.log('WebSocket 连接已打开');};// 设置 WebSocket 接收到消息时的回调函数socket.onmessage = function(event) {console.log('WebSocket 接收到消息:', event.data);messageBox.value += event.data + '\n';};// 设置 WebSocket 发生错误时的回调函数socket.onerror = function() {console.log('WebSocket 发生错误');};// 设置 WebSocket 连接关闭时的回调函数socket.onclose = function() {console.log('WebSocket 连接已关闭');};// 点击按钮时发送消息sendBtn.onclick = function() {const message = 'Hello, WebSocket!';socket.send(message);messageBox.value += '发送消息: ' + message + '\n';};
之后，可以看到端口被占用，服务器在监听:
html资源命名为lighttpd1.4-lighttpd-1.4.76/www/websocket.html，内容:
<!DOCTYPE html>
<html>
<head><meta charset="UTF-8"><title>WebSocket 示例</title>
</head>
<body><button id="sendBtn">发送消息</button><textarea id="messageBox" readonly></textarea><script src="websocket.js"></script>
</body>
</html>
在浏览器中访问资源:
服务端收到数据:
注意:
- 在网站: https://github.com/nori0428/mod_websocket上，有描述:
DEAD.use lighttpd v1.4.46 or after w/ mod_proxy and mod_wstunnnel.，该项目已经停止维护，建议使用mod_wstunnnel了。服务器上AMI BMC的实现kvm，sol, cd-server还是在用mod_websocket。
从https://github.com/nori0428/mod_websocket/tree/master摘录一下数据流:
client <--- ssl ---> lighttpd - mod_websocket <--- tcp ---> your websocket server