#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
int port = 10005;
int SendInfo(char* ip, char* info)
{
int sockfd;
int len = 0;
struct sockaddr_in adr_srvr;
bzero(&adr_srvr, sizeof(adr_srvr));
adr_srvr.sin_family = AF_INET;
adr_srvr.sin_addr.s_addr = inet_addr(ip);
adr_srvr.sin_port = htons(port);
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if(sockfd == -1)
{
printf("连接失败,ip=%s,port=%d\n",ip,port);
return -1;
}
len = sendto(sockfd, info, strlen(info), 0, (struct sockaddr*)&adr_srvr, sizeof(adr_srvr));
if(len < 0)
{
printf("发送数据失败!\n");
return -1;
}
printf("回复成功!info=%s\n",info);
close(sockfd);
}
int test()
{
int sockfd;
int len;
int z;
char buf[256];
struct sockaddr_in adr_inet;
struct sockaddr_in adr_clnt;
printf("等待Client段传送数据....\n");
bzero(&adr_inet, sizeof(adr_inet));
adr_inet.sin_family = AF_INET;
//adr_inet.sin_addr.s_addr = inet_addr("218.244.145.161");
//adr_inet.sin_addr.s_addr = inet_addr("192.168.207.40");
adr_inet.sin_addr.s_addr = htonl(INADDR_ANY);
adr_inet.sin_port = htons(port);
len = sizeof(adr_clnt);
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if(sockfd == -1)
{
perror("socket error");
exit(1);
}
z = bind(sockfd, (struct sockaddr *)&adr_inet, sizeof(adr_inet));
if(z == -1)
{
perror("bind error");
exit(1);
}
printf("监听和绑定成功....\n");
while(1)
{
z = recvfrom(sockfd, buf, sizeof(buf), 0, (struct sockaddr *)&adr_clnt, (socklen_t *)&len);
if(z < 0)
{
perror("recvfrom error");
printf("recv error\n");
exit(1);
}
buf[z] = 0;
char* ip = inet_ntoa(adr_clnt.sin_addr);
printf("ip=%s,port=%d\n",ip, ntohs(adr_clnt.sin_port));
printf("接收数据:");
for(int i=0; i<z;i++)
{
printf("%02X ",buf[i]);
}
printf(" 数据长度:%d\n",z);
//取出本地IP地址
struct sockaddr_in serv;
char serv_ip[20];
int serv_len = sizeof(serv);
getsockname(sockfd, (struct sockaddr *)&serv,(socklen_t *) &serv_len);
inet_ntop(AF_INET, &serv.sin_addr, serv_ip, sizeof(serv_ip));
printf("本地地址:%s\n",serv_ip);
SendInfo(ip, buf);
}
close(sockfd);
}
int main(int argc, char *argv[])
{
test();
return 0;
}
编译:g++ main.c -o udp
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