网络编程-day2
TCP服务器
#include
#define ERR_MSG(msg) do{\
fprintf(stderr, "__%d__", __LINE__);\
perror(msg);\
}while(0)
#define PORT 8888 //端口号，范围1024~49151
#define IP "192.168.43.126" //本机IP
int main(int argc, const char *argv[])
{
//创建流式套接字
int sfd = socket(AF_INET, SOCK_STREAM, 0);
if(sfd < 0)
{
ERR_MSG("socket");
return -1;
}
printf("socket create success sfd=%d\n", sfd);
//允许端口快速的被复用
int reuse = 1;
if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0)
{
ERR_MSG("setsockopt");
return -1;
}
printf("允许端口被复用成功\n");
//填充地址信息结构体给bind函数绑定
//真实的地址信息结构体根据地址族制定AF_INET:man 7 ip
struct sockaddr_in sin;
sin.sin_family = AF_INET; //必须填AF_INET
sin.sin_port = htons(PORT); //端口号的网络字节序
sin.sin_addr.s_addr = inet_addr(IP); //本机IP
//绑定服务器的地址信息 -->必须绑定 bind
if(bind(sfd, (struct sockaddr*)&sin, sizeof(sin)) < 0)
{
ERR_MSG("bind");
return -1;
}
printf("bind success\n");
//将套接字设置为被动监听状态 listen
if(listen(sfd, 128) < 0)
{
ERR_MSG("listen");
return -1;
}
printf("listen success\n");
int newfd = -1;
struct sockaddr_in cin; //存储客户端的地址信息
socklen_t addrlen = sizeof(cin); //真实的地址信息结构体大小
//获取一个已经完成的客户端信息，生成一个新的文件描述符 accept
//newfd = accept(sfd, NULL, NULL);
newfd = accept(sfd, (struct sockaddr*)&cin, &addrlen);
if(newfd < 0)
{
ERR_MSG("newfd");
return -1;
}
printf("[%s:%d]客户端连接成功 newfd=%d\n",\
inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), newfd);
char buf[128] = "";
ssize_t res = 0;
while(1)
{
//清空字符串
bzero(buf, sizeof(buf)); //也可以用memset
//接收
res = recv(newfd, buf, sizeof(buf), 0);
if(res < 0)
{
ERR_MSG("recv");
return -1;
}else if(0 == res)
{
printf("[%s:%d]客户端下线 newfd=%d\n",\
inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), newfd);
break;
}
printf("[%s:%d] newfd=%d :%s\n", \
inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), newfd, buf);
//发送
strcat(buf, "O.o");
if(send(newfd, buf, sizeof(buf), 0) < 0)
{
ERR_MSG("send");
return -1;
}
printf("send success\n");
}
//关闭文件描述符
if(close(sfd) < 0)
{
ERR_MSG("close");
return -1;
}
return 0;
}
TCP客户端
#include
#define ERR_MSG(msg) do{\
fprintf(stderr, "__%d__", __LINE__);\
perror(msg);\
}while(0)
#define PORT 8888 //端口号，范围1024~49151
#define IP "192.168.116.74" //本机IP
int main(int argc, const char *argv[])
{
//创建流式套接字 socket
int cfd = socket(AF_INET, SOCK_STREAM, 0);
if(cfd < 0)
{
ERR_MSG("socket");
return -1;
}
printf("socket create success cfd=%d\n", cfd);
//连接指定服务器 connect
char buf[128] = "";
ssize_t res = 0;
while(1)
{
//清空字符串
bzero(buf, sizeof(buf)); //也可以用memset
printf("请输入>>> ");
fgets(buf ,sizeof(buf), stdin);
buf[strlen(buf)-1] = 0;
//发送
strcat(buf, "O.o");
if(send(cfd, buf, sizeof(buf), 0) < 0)
{
ERR_MSG("send");
return -1;
}
printf("send success\n");
//接收
res = recv(cfd, buf, sizeof(buf), 0);
if(res < 0)
{
ERR_MSG("recv");
return -1;
}else if(0 == res)
{
printf("服务器下线 cfd=%d\n", cfd);
break;
}
printf("cfd=%d : %s\n", cfd, buf);
}
//关闭文件描述符
if(close(cfd) < 0)
{
ERR_MSG("close");
return -1;
}
return 0;
}
UDP服务器
#include
#define ERR_MSG(msg) do{\
fprintf(stderr, "__%d__", __LINE__);\
perror(msg);\
}while(0)
#define PORT 8888 //端口号，范围1024~49151
#define IP "192.168.116.74" //本机IP
int main(int argc, const char *argv[])
{
//创建报式套接字 socket
int sfd = socket(AF_INET, SOCK_DGRAM, 0);
if(sfd < 0)
{
ERR_MSG("socket");
return -1;
}
printf("socket create success sfd=%d\n", sfd);
//填充服务器的地址信息结构体，给bind函数使用
//真实的地址信息结构体根据地址族指定，AF_INET:man 7 IP
struct sockaddr_in sin;
sin.sin_family = AF_INET; //必须填AF_INET
sin.sin_port = htons(PORT); //端口号的网络字节序，1024-49151
sin.sin_addr.s_addr = inet_addr(IP);//本机IP,ifconfig
//绑定地址信息结构体--->bind
if(bind(sfd,(struct sockaddr*)&sin, sizeof(sin)) < 0)
{
ERR_MSG("bind");
return -1;
}
printf("bind success\n");
char buf[128] = "";
struct sockaddr_in cin; //存储发送方的地址信息
socklen_t addrlen = sizeof(cin);
while(1)
{
bzero(buf, sizeof(buf));
//接收数据
if(recvfrom(sfd, buf, sizeof(buf), 0, (struct sockaddr*)&cin, &addrlen) < 0)
{
ERR_MSG("recv");
return -1;
}
printf("[%s:%d] : %s\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port),buf);
//发送数据--->谁发还谁
strcat(buf, "O.o");
if(sendto(sfd, buf, sizeof(buf), 0, (struct sockaddr*)&cin, sizeof(cin)) < 0)
{
ERR_MSG("sendto");
return -1;
}
printf("sendto success\n");
}
//关闭套接字
close(sfd);
return 0;
}
UDP客户端
#include
#define ERR_MSG(msg) do{\
fprintf(stderr, "__%d__", __LINE__);\
perror(msg);\
}while(0)
#define PORT 8888 //端口号，范围1024~49151
#define IP "192.168.116.74" //本机IP,ifconfig
int main(int argc, const char *argv[])
{
//创建报式套接字 socket
int cfd = socket(AF_INET, SOCK_DGRAM, 0);
if(cfd < 0)
{
ERR_MSG("socket");
return -1;
}
printf("socket create success cfd=%d\n", cfd);
//填充服务器的地址信息结构体，给bind函数使用
//真实的地址信息结构体根据地址族指定，AF_INET:man 7 IP
struct sockaddr_in sin;
sin.sin_family = AF_INET; //必须填AF_INET
sin.sin_port = htons(PORT); //端口号的网络字节序，1024-49151
sin.sin_addr.s_addr = inet_addr(IP);//本机IP,ifconfig
char buf[128] = "";
while(1)
{
bzero(buf, sizeof(buf));
printf("请输入>>>");
fgets(buf, sizeof(buf), stdin);
buf[strlen(buf)-1] = 0;
//发送数据
if(sendto(cfd, buf, sizeof(buf), 0, (struct sockaddr*)&sin, sizeof(sin)) < 0)
{
ERR_MSG("sendto");
return -1;
}
printf("sendto success\n");
//接收数据
if(recvfrom(cfd, buf, sizeof(buf), 0, (struct sockaddr*)&sin, NULL) < 0)
{
ERR_MSG("recv");
return -1;
}
printf("[cfd=%d : %s\n", cfd,buf);
}
//关闭套接字
close(cfd);
return 0;
}
思维导图