/*

linux 下发送和接收链路层广播报文

*/

#include<stdio.h>

#include<string.h>

#include<unistd.h>

#include<sys/socket.h>

#include<netinet/in.h>

#include<netinet/ip.h>

#include<net/if.h>

#include<netpacket/packet.h>

#include<net/ethernet.h>

#include<arpa/inet.h>

#include<net/if_arp.h>

#define BUFFER_SIZE 1024*2

#define CFG_ETHN "eth1"

int main()

{

int socket,ret;

char buffer[BUFFER_SIZE];

struct sockaddr_ll dest_addr;

struct ifreq ifr;

//创建原始套接字

sockfd = socket(AF_PACKET, SOCK_RAM, htons(ETH_P_ALL));

if(sockfd <0)

{

perror("socket creation failed");

return 1;

}

//设置接口为混杂模式

strncpy(ifr, ifr_name, CFG_ETHN, IFNAMSIZ);

ret = setsockopt(sockfd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr));

if(ret < 0)

{

perror("setsockopt failed");

return 1;

}

int count = 0;

while(1)

{

//接收报文

memset(buffer, 0x0, BBUFFER_SIZE;

ret = recvfrom(sockfd, buffer, BUFFER_SIZE, 0 ,NULL, NULL);

if(ret<0)

{

perror("recvfrom failed");

close(sockfd);

return 1;

}

printf("%s receive len:%d\n", CFG_ETHN, ret);

count++;

printf("not 0 count++:%d\n", ret);

printf("Received broadcast message:len %ld",ret);

for(int i =0; i < ret; i++)

{

printf("%02x ", uffer[i]&0xff);

}

printf("\n\n");

close(sockfd);

return 0;

}

===============================

发送代码

int sockfd,ret;

char buffer[UFFER_SIZE];

struct sockadd_lldest_addr;

struct ifreq ifr;

memset(&dest_addr,0,sizeof(dest_addr));

dest_addr.ll_family = AF_PACKET;

.sll_protocol = htons(ETH_P_ALL;

.sll_ifindex = if_nametoindex(CFG_ETHN);

.sll_hatype = ARPHRD_ETHER;

.sll_pkttype = PACKET_ROADCAST;

.sll_halen = ETH_ALEN;

memset(dest_addr,sll_addr,0xff,ETH_ALEN);

sprintf(sendbuf,"strlen(sendbuff):%d",strlen(sendbuf));

memcpy(sendbuf,&strpktinfo,sizeof(STU_PTK_INFO);

ret = sendto(sockfd,senduff,60,0,(struct sockaddr*)&dest_addr,sizeof(dest_addr));

if(ret<0)

{

perror("sendto failed");

close(sockfd);

return1;

}

printf("sendroadcast message"\n);

for(int i =0; i < sizeof(STU_PKT_INFO); i++)

{

printf("%02x",senduf[i]&0xff);

}

printf("\n\n")

}

close(sockfd);

return 0;

}

}