//客户端程序
#include <unistd.h>
#include <sys/stat.h>#include <sys/wait.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main()
{
int sockfd = 0;
sockfd = socket(PF_INET, SOCK_STREAM, 0);
if (sockfd == -1)
{
perror("fun socket\n");
exit(0);
}
struct sockaddr_in srvaddr;
srvaddr.sin_family = AF_INET;
srvaddr.sin_port = htons(8001);
srvaddr.sin_addr.s_addr = inet_addr("192.168.1.165"); //127.0.0.1
//srvaddr.sin_addr.s_addr = inet_addr(INADDR_ANY); //绑定本机的任意一个地址
if ( connect(sockfd, (struct sockaddr*) (&srvaddr), sizeof(srvaddr)) < 0)
{
perror("fun socket\n");
exit(0);
}
char revbuf[1024] = {0};
char sendbuf[1024] = {0};
while (fgets(sendbuf, sizeof(sendbuf), stdin) != NULL)
{
//向服务写数据
write(sockfd, sendbuf, strlen(sendbuf)); //服务器端回发信息
//从服务器读数据
read(sockfd, revbuf, sizeof(revbuf));
//
fputs(revbuf, stdout); //从服务器收到数据,打印屏幕
memset(revbuf, 0, sizeof(revbuf));
memset(sendbuf, 0, sizeof(sendbuf));
}
close(sockfd);
return 0;
}
//服务器程序
#include <unistd.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int main()
{
int sockfd = 0;
sockfd = socket(PF_INET, SOCK_STREAM, 0);
if (sockfd == -1)
{
perror("fun socket\n");
exit(0);
}
struct sockaddr_in srvaddr;
srvaddr.sin_family = AF_INET;
srvaddr.sin_port = htons(8001);
srvaddr.sin_addr.s_addr = inet_addr("192.168.6.249"); //127.0.0.1
//srvaddr.sin_addr.s_addr = inet_addr(INADDR_ANY); //绑定本机的任意一个地址
int optval = 1;
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) < 0)
{
perror("setsockopt bind\n");
exit(0);
}
if ( bind( sockfd, (struct sockaddr *)&srvaddr, sizeof(srvaddr)) < 0)
{
perror("fun bind\n");
exit(0);
}
//一但调用listen函数,这个套接字sockfd将变成被动套接字;只能接受连接,不能主动的发送连接
//listen 做了两个队列。。。。。。
if ( listen(sockfd, SOMAXCONN)<0 )
{
perror("fun listen\n");
exit(0);
}
//struct sockaddr peeraddr; //通用ip
//socklen_t perrlen ;
struct sockaddr_in peeraddr; //tcpip地址结构
socklen_t peerlen = sizeof(peeraddr);
char revbuf[1024] = {0};
while (1)
{
unsigned int conn = 0;
//accept 返回一个新的连接 ,这个新的连接是一个主动套接字
conn = accept(sockfd, (struct sockaddr *)&peeraddr, (socklen_t *)&peerlen);
if (conn == -1)
{
perror("fun listen\n");
exit(0);
}
//每来一个来连接 启动一个子进程fork
int pid = fork();
if (pid == 0)
{
close(sockfd); //
printf("perradd:%s\n perrport:%d\n", inet_ntoa(peeraddr.sin_addr), ntohs(peeraddr.sin_port));
int ret = read(conn, revbuf, sizeof(revbuf));
if (ret == 0)
{
//如果在读的过程中,对方已经关闭,tcpip协议会返回一个0数据包
printf("对方已关闭\n");
exit(0);
}
else if (ret < 0)
{
perror("读数据失败\n");
exit(0);
}
//ssize_t write(int fd, const void *buf, size_t count);
fputs(revbuf, stdout); //服务器端收到数据,打印屏幕
write(conn, revbuf, ret); //服务器端回发信息
}
else if (pid > 0)
{
close(conn);
}
else
{
printf("创建进程失败\n");
exit(0);
}
}
return 0;
}