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自己用如下代码创建了raw socket,可以获取发给本机ip地址的ip包,但无法获取广播包,想请教下该怎么才能得到发给255.255.255.255的ip包。
/*
* 创建获取网卡数据的套接字
*/
eth_t *eth_open(const char *device)
{
eth_t *e;
int n;
struct packet_mreq mr;
if ((e = MALLOC(sizeof(eth_t))) != NULL) {
MEMSET(e, 0, sizeof(eth_t));
if ((e->fd = socket(PF_PACKET, SOCK_RAW,
htons(ETH_P_ALL))) < 0)
return (eth_close(e));
#ifdef SO_BROADCAST
n = 1;
if (setsockopt(e->fd, SOL_SOCKET, SO_BROADCAST, &n,
sizeof(n)) < 0)
return (eth_close(e));
#endif
strcpy(e->ifr.ifr_name, device);
if (ioctl(e->fd, SIOCGIFINDEX, &e->ifr) < 0)
return (eth_close(e));
e->sll.sll_family = AF_PACKET;
e->sll.sll_ifindex = e->ifr.ifr_ifindex;
e->sll.sll_protocol = htons(ETH_P_ALL);
e->sll.sll_halen = 6;
memset(e->sll.sll_addr, 0xFF, 6);
if(bind(e->fd, (struct sockaddr *) &(e->sll), sizeof(struct sockaddr_ll)) == -1)
{
return eth_close(e);
}
MEMSET(&mr, 0, sizeof(mr));
mr.mr_ifindex = e->ifr.ifr_ifindex;
mr.mr_type = PACKET_MR_PROMISC;
if (setsockopt(e->fd, SOL_PACKET,
PACKET_ADD_MEMBERSHIP, &mr, sizeof(mr)) == -1)
{
return eth_close(e);
}
}
if(strcmp(device,"eth0") == 0)
{
MEMCPY(e->mac, table[0].mac,6);
}
else
{
MEMCPY(e->mac, table[1].mac,6);
}
return (e);
} |
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