(一)简单C/S模型
(1)服务器端
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
void Server()
{
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
if(sockfd == -1)
{
perror("socket create err");
return;
}
struct sockaddr_in saddr, caddr;
int len_ser = sizeof(saddr);
int len_cli = sizeof(caddr);
memset(&saddr, 0, len_ser);
memset(&caddr, 0, len_cli);
saddr.sin_family = AF_INET;
saddr.sin_port = htons(8000);
saddr.sin_addr.s_addr = inet_addr("127.0.0.1");
int ret = bind(sockfd, (struct sockaddr*)&saddr, len_ser);
if(ret == -1)
{
perror("bind err");
return;
}
ret = listen(sockfd, 5);
if(ret == -1)
{
perror("listen err");
return;
}
while(1)
{
printf("server have started, wait linking...\n");
int cli_sockfd = accept(sockfd, (struct sockaddr*)&caddr, &len_cli);
while(1)
{
char buff[128] = {
0};
ret = recv(cli_sockfd, buff, 127, 0);
if(ret <= 0)
{
printf("one client close\n");
close(cli_sockfd);
break;
}
printf("cli : %s\n", buff);
memset(buff, 0, 128);
printf("input send to cli : ");
fflush(stdout);
fgets(buff, 127, stdin);
int len = strlen(buff);
buff[len - 1] = '\0';
send(cli_sockfd, buff, len, 0);
}
}
close(sockfd);
}
int main()
{
Server();
return 0;
}
(2)客户端
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
void client()
{
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
if(sockfd == -1)
{
perror("socket err");
return;
}
struct sockaddr_in saddr;
int len_ser = sizeof(saddr);
memset(&saddr, 0, len_ser);
saddr.sin_family = AF_INET;
saddr.sin_port = htons(8000);
saddr.sin_addr.s_addr = inet_addr("127.0.0.1");
int ret = connect(sockfd, (struct sockaddr*)&saddr, len_ser);
if(ret == -1)
{
perror("connect err");
return;
}
printf("connect sucessful...\n");
while(1)
{
printf("input to server data:");
fflush(stdout);
char buff[128] = {
0};
fgets(buff, 127, stdin);
int len = strlen(buff);
buff[len - 1] = '\0';
if(strcmp(buff, "end") == 0)
{
break;
}
send(sockfd, buff, len, 0);
memset(buff, 0, 128);
ret = recv(sockfd, buff, 127, 0);
if(ret <= 0)
{
perror("server unnormal close");
break;
}
printf("ser:%s\n", buff);
}
close(sockfd);
}
int main()
{
client();
return 0;
}
- 交互结果:
- 客户端连接服务器后使用
netstat -natp
查看下ip和端口的使用情况: