DNS后台启动程序

最新推荐文章于 2024-05-25 20:45:00 发布

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#struct #system #stream #socket

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此博客展示了一段C语言代码，通过socket编程实现网络通信。创建socket并绑定地址，监听客户端连接。根据客户端发送的消息，如“start”“stop”“restart”，使用system函数执行相应的系统命令，如启动、停止和重启named服务。

// louis 2004-8-21

#include<stdio.h>
#include<sys/socket.h>
#include<syslog.h>

#include<sys/types.h>
#include<netinet/in.h>
#include<arpa/inet.h>

#define PORT 1234

int main()
{
int sockfd, clientfd, childpid;
struct sockaddr_in addr, cliaddr;
int len = sizeof(struct sockaddr_in);
char buf[256];

memset(buf, 0, 256);
// bzero(buf, 256);

if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
//perror("");
}

// fill in struct sockaddr_in
bzero(&addr, len);
addr.sin_family = AF_INET;
addr.sin_port = htons(PORT);
addr.sin_addr.s_addr = htonl(INADDR_ANY);

if(bind(sockfd, (struct sockaddr *)&addr, len) < 0){
syslog(LOG_LOCAL4 | LOG_INFO, "[test] bind error");
exit(1);
}

if(listen(sockfd, 5)<0){
syslog(LOG_LOCAL4 | LOG_INFO, "[test] listen error");
exit(1);
}

while(1){
    clientfd = accept(sockfd, (struct sockaddr *)&cliaddr, &len);
    if((childpid = fork()) == 0){ // child process
      close(sockfd);
      // handle the clientfd;
      while(1){
          if(recv(clientfd, buf, 256, 0) != -1){
             char *p = strstr(buf, "/r/n");
             *p = '/0';
             syslog(LOG_LOCAL4 | LOG_INFO, "[test] buf is %s, len is %d", buf, strlen(b
uf));
             if(strcmp(buf, "start") == 0)
                system("/usr/sbin/named -u named -c /etc/named.conf");
             if(strcmp(buf, "stop") == 0)
                system("killall -9 named");
             if(strcmp(buf, "restart") == 0)
                system("killall -HUP named");