/*************************************************************************

> File Name: server.c

> Author: Winter

> Created Time: 2021年12月15日 星期三 19时20分07秒

************************************************************************/

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include<unistd.h>

#include<pthread.h>

#include<sys/socket.h>

#include<ctype.h>

#include<arpa/inet.h>

#define SERVER_PORT 9527

int main(int argc, char* argv[])

{

int lfd = 0, newfd = 0;

int res = 0;

char buff[BUFSIZ], client_IP[BUFSIZ];

struct sockaddr_in server_addr, client_addr;

socklen_t client_addr_len;

// 初始化server_addr

server_addr.sin_family = AF_INET; // 使用的协议是ipv4

server_addr.sin_port = htons(SERVER_PORT); // 端口号

server_addr.sin_addr.s_addr = htonl(INADDR_ANY); // ip地址

// 1 创建socket

lfd = socket(AF_INET, SOCK_STREAM, 0);

if (lfd == -1)

{

perror("socket error\n");

exit(1);

}

// 2 绑定服务器地址结构

res = bind(lfd, (struct sockaddr*)(&server_addr), sizeof(server_addr));

if (res == -1)

{

perror("bind error\n");

exit(1);

}

// 3 设置监听上限

res = listen(lfd, 128);

if (res == -1)

{

perror("listen error\n");

exit(1);

}

// 4 阻塞监听客户端连接

client_addr_len = sizeof(client_addr);

newfd = accept(lfd,(struct sockaddr*)(&client_addr), &client_addr_len);

if (newfd == -1)

{

perror("accept error\n");

exit(1);

}

printf("client ip = %s, port = %d\n",

inet_ntop(AF_INET, &client_addr.sin_addr.s_addr, client_IP, sizeof(client_IP)),

ntohs(client_addr.sin_port)

);

while(1)

{

// 5 read

res = read(newfd, buff, sizeof(buff));

if (res == -1)

{

perror("read error\n");

exit(1);

}

// 输出一下

write(STDOUT_FILENO, buff, res);

// 6 小写转大写

for (int i = 0; i < res; i++)

{

buff[i] = toupper(buff[i]);

}

// 7 write

int ret = write(newfd, buff, res);

if (ret == -1)

{

perror("write error\n");

exit(1);

}

}

close(lfd);

close(newfd);

return 0;

}