作业-11.22
1、TCP服务器和客户端交互
服务器
#include
#include
#include
#include
#include
#include
#include#define ERR_MSG(msg) do{\
fprintf(stderr, "__%d__", __LINE__);\
perror(msg);\
}while(0)#define PORT 6666
#define IP "192.168.31.111"
int main(int argc, const char *argv[])
{
int sfd = socket(AF_INET, SOCK_STREAM, 0);
if(sfd < 0)
{
ERR_MSG("socket");
return -1;
}int reuse = 1;
if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse ,sizeof(reuse)) < 0)
{
ERR_MSG("setsockopt");
return -1;
}
printf("允许端口快速重用\n");struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(PORT);
sin.sin_addr.s_addr = inet_addr(IP);if(bind(sfd, (struct sockaddr*)&sin, sizeof(sin)) < 0)
{
ERR_MSG("bind");
return -1;
}if(listen(sfd, 128) < 0)
{
ERR_MSG("listen");
return -1;
}
printf("服务器监听成功\n");struct sockaddr_in cin;
socklen_t addrlen = sizeof(cin);int newfd = accept(sfd, (struct sockaddr*)&cin, &addrlen);
if(newfd < 0)
{
ERR_MSG("newfd");
return -1;
}
printf("newfd = %d link successful!\n", newfd);
ssize_t res = 0;
char buf[128] = "";
while(1)
{
bzero(buf, sizeof(buf));res = recv(newfd, buf, sizeof(buf), 0);
if(res < 0)
{
ERR_MSG("recv");
return -1;
}
else if(!res)
{
printf("newfd = %d link close!\n", newfd);
break;
}printf("res:%ld, newfd:%d : %s\n", res, newfd, buf);
strcat(buf, "*_*");
if(send(newfd, buf, sizeof(buf), 0) < 0)
{
ERR_MSG("sen");
return -1;
}
printf("send success\n");
}close(newfd);
close(sfd);return 0;
}
客户端
#include
#include
#include
#include
#include
#include
#include#define ERR_MSG(msg) do{\
fprintf(stderr, "__%d__:", __LINE__);\
perror(msg);\
}while(0)
#define CLI_PORT 6656
#define CLI_IP "192.168.31.111"#define SER_PORT 8888
#define SER_IP "192.168.31.111"int main(int argc, const char *argv[])
{
int sfd = socket(AF_INET, SOCK_STREAM, 0);
if(sfd < 0)
{
ERR_MSG("socket");
return -1;
}struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(SER_PORT);
sin.sin_addr.s_addr = inet_addr(SER_IP);if(connect(sfd, (struct sockaddr*)&sin, sizeof(sin)) < 0)
{
ERR_MSG("connect");
return -1;
}
printf("connect success\n");
ssize_t res = 0;
char buf[128] = "";
while(1)
{
bzero(buf, sizeof(buf));
//发送
printf("请输入>>>");
fgets(buf, sizeof(buf), stdin);
buf[strlen(buf)-1] = 0;
if(0 == strcmp("quit", buf))
{
printf("客户端退出\n");
break;
}if(send(sfd, buf, sizeof(buf), 0) < 0)
{
ERR_MSG("sen");
return -1;
}
printf("send success\n");//接收
res = recv(sfd, buf, sizeof(buf), 0);
if(res < 0)
{
ERR_MSG("recv");
return -1;
}
else if(0 == res)
{
printf("服务器断开连接\n");
break;
}
printf(":%s\n", buf);}
close(sfd);
return 0;
}
2、UDP服务器和客户端交互
服务器
#include
#include
#include
#include
#include
#include
#include#define ERR_MSG(msg) do{\
fprintf(stderr, "__%d__:", __LINE__);\
perror(msg);\
}while(0)#define PORT 8888
#define IP "192.168.31.111"int main(int argc, const char *argv[])
{
int sfd = socket(AF_INET, SOCK_DGRAM, 0);
if(sfd < 0)
{
ERR_MSG("socket");
return -1;
}struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(PORT);
sin.sin_addr.s_addr = inet_addr(IP);if(bind(sfd, (struct sockaddr*)&sin, sizeof(sin)) < 0)
{
ERR_MSG("bind");
return -1;
}
printf("bind success\n");ssize_t res = 0;
char buf[128] = "";struct sockaddr_in cin;
socklen_t addrlen = sizeof(cin);
while(1)
{
bzero(buf, sizeof(buf));
res = recvfrom(sfd, buf, sizeof(buf), 0, (struct sockaddr*)&cin, &addrlen);
if(res < 0)
{
ERR_MSG("recvfrom");
return -1;
}
else if(0 ==strcmp("quit", buf))
{
printf("link close ser close.\n");
break;
}
printf("[%s:%d] : %s\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), buf);strcat(buf, "已发送---->");
if(sendto(sfd, buf, sizeof(buf), 0, (struct sockaddr*)&cin, sizeof(cin)) < 0)
{
ERR_MSG("sendto");
return -1;
}
printf("sendto success\n");}
close(sfd);return 0;
}
客户端
#include
#include
#include
#include
#include
#include
#include#define ERR_MSG(msg) do{\
fprintf(stderr, "__%d__:", __LINE__);\
perror(msg);\
}while(0)#define CLI_PORT 6666
#define CLI_IP "192.168.31.111"#define SER_PORT 8888
#define SER_IP "192.168.31.111"int main(int argc, const char *argv[])
{
int sfd = socket(AF_INET, SOCK_DGRAM, 0);
if(sfd < 0)
{
ERR_MSG("socket");
return -1;
}struct sockaddr_in cin;
cin.sin_family = AF_INET;
cin.sin_port = htons(CLI_PORT);
cin.sin_addr.s_addr = inet_addr(CLI_IP);if(bind(sfd, (struct sockaddr*)&cin, sizeof(cin)) < 0)
{
ERR_MSG("bind");
return -1;
}
printf("bind success\n");struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(SER_PORT);
sin.sin_addr.s_addr = inet_addr(SER_IP);ssize_t res = 0;
char buf[128] = "";struct sockaddr_in rcvaddr;
socklen_t addrlen = sizeof(rcvaddr);
while(1)
{
bzero(buf, sizeof(buf));
printf("请输入>>>");
fgets(buf, sizeof(buf), stdin);
buf[strlen(buf)-1] = 0;if(sendto(sfd, buf, sizeof(buf), 0, (struct sockaddr*)&sin, sizeof(sin)) < 0)
{
ERR_MSG("sendto");
return -1;
}
if(0 == strcmp("quit", buf))
{
printf("客户端退出\n");
break;
}
printf("sendto success\n");res = recvfrom(sfd, buf, sizeof(buf), 0, (struct sockaddr*)&rcvaddr, &addrlen);
if(res < 0)
{
ERR_MSG("recvfrom");
return -1;
}
printf("[%s:%d] : %s\n", inet_ntoa(rcvaddr.sin_addr), ntohs(rcvaddr.sin_port), buf);
}
close(sfd);return 0;
}
