获取本地IP地址2

来源：互联网发布：caffe windows github 编辑：程序博客网时间：2024/05/23 20:41

程序功能：

本程序主要获取本地的IP地址

思路分析：程序通过发送广播包，然后接受广播包，来获取IP地址和端口号

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#include <unistd.h>

#include <arpa/inet.h>

#include <netdb.h>

#define PORT 7778

#define MAXDATASIZE 1024

int main() 

{

struct sockaddr_in user_addr,my_addr;

char my_ip[13];

int socket_fd;

int so_broadcast=1;

char buf[MAXDATASIZE];

char revbuf[MAXDATASIZE];

socklen_t size;

my_addr.sin_family=AF_INET;

my_addr.sin_port=htons(PORT);

my_addr.sin_addr.s_addr=inet_addr("255.255.255.255");

user_addr.sin_family=AF_INET;

user_addr.sin_port=htons(PORT);

user_addr.sin_addr.s_addr=htonl(INADDR_ANY);

if((socket_fd=(socket(AF_INET,SOCK_DGRAM,0)))==-1) {

perror("socket");

exit(1); 

}

setsockopt(socket_fd,SOL_SOCKET,SO_BROADCAST,&so_broadcast,sizeof(so_broadcast));//socket发送的数据具有广播特性

if((bind(socket_fd,(struct sockaddr *)&user_addr, sizeof(struct sockaddr)))==-1) {

perror("bind");

exit(1); 

}

strcpy(buf,"broadcast test");

sendto(socket_fd,buf,strlen(buf),0,(struct sockaddr *)&my_addr,sizeof(my_addr));

printf("buf=%s\n",buf);

printf("s_ip:%s\n",inet_ntoa(my_addr_addr.sin_addr));

printf("s_port:%d\n",ntohs(my_addr_addr.sin_port));

size=sizeof(user_addr);

recvfrom(socket_fd,buf,MAXDATASIZE,0,(struct sockaddr *)&user_addr,&size);

printf("revbuf=%s\n"revbuf);

strcpy(my_ip,inet_ntoa(user_addr.sin_addr));

printf("my_ip:%s\n",inet_ntoa(user_addr.sin_addr));

printf("my_port:%d\n",ntohs(user_addr.sin_port));

}

运行结果：

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