服务端
#include<stdio.h>
#include <sys/socket.h>
#include<string.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netinet/in.h>
#define TCP_PORT 9999
int main()
{
char ipbuf[32];
char recbuf[0x1000];
int socket_ser,socket_accept;
socket_ser = socket(AF_INET,SOCK_STREAM,0);
struct sockaddr_in addr,addr_c;
bzero(&addr,sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(TCP_PORT);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
bind(socket_ser,(struct sockaddr *)&addr,sizeof(addr));
listen(socket_ser,128);
while(1)
{
bzero(ipbuf, sizeof(ipbuf));
bzero(&addr_c,sizeof(addr_c));
bzero(recbuf,sizeof(recbuf));
int len_c;
socket_accept = accept(socket_ser,(struct sockaddr *)&addr_c,(socklen_t *)&len_c);
inet_ntop(AF_INET,&addr_c.sin_addr.s_addr,ipbuf,sizeof(ipbuf));
printf("Ip is %s,port is %d\n",ipbuf,ntohs(addr_c.sin_port));
int len = read(socket_accept,recbuf,sizeof(recbuf));
printf("%s\n",recbuf);
write(socket_accept,recbuf,len);
close(socket_accept);
}
close(socket_ser);
return 0;
}
客户端
#include<stdio.h>
#include <sys/socket.h>
#include<string.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netinet/in.h>
#define TCP_PORT 9999
int main()
{
int socket_fd,socket_accept;
socket_fd = socket(AF_INET,SOCK_STREAM,0);
struct sockaddr_in addr;
bzero(&addr,sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(TCP_PORT);
inet_pton(AF_INET,"127.0.0.1",&addr.sin_addr.s_addr);
connect(socket_fd,(struct sockaddr*)&addr,sizeof(addr));
char bufsend[] = "hello world";
char bufrec[0x1000];
bzero(bufrec,sizeof(bufrec));
write(socket_fd,bufsend,strlen(bufsend));
read(socket_fd,bufrec,sizeof(bufrec));
printf("%s\n",bufrec);
close(socket_fd);
return 0;
}
没啥知识点,需要注意的是socket_accept即是三次握手完成,用inet_ntop转换ip要好点 inet_ntop是可重入函数