通过IP或socket获取对方的MAC地址

通过IP或socket获取对方的MAC地址 收藏

1。通过已经连接的socket文件获取：

view plaincopy to clipboardprint?

int getpeermac( int sockfd, char *buf )

{

int ret =0;

struct arpreq arpreq;

struct sockaddr_in dstadd_in;

socklen_t  len = sizeof( struct sockaddr_in );

memset( &arpreq, 0, sizeof( struct arpreq ));

memset( &dstadd_in, 0, sizeof( struct sockaddr_in ));

if( getpeername( sockfd, (struct sockaddr*)&dstadd_in, &len )

err_err("getpeername()");

else

{

memcpy( &arpreq.arp_pa, &dstadd_in, sizeof( struct sockaddr_in ));

strcpy(arpreq.arp_dev, "eth1");

arpreq.arp_pa.sa_family = AF_INET;

arpreq.arp_ha.sa_family = AF_UNSPEC;

if( ioctl( sockfd, SIOCGARP, &arpreq )

err_err("ioctl SIOCGARP");

else

{

unsigned char* ptr = (unsigned char *)arpreq.arp_ha.sa_data;

ret = sprintf(buf, "%02x%02x%02x%02x%02x%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5));

}

}

return ret;

}

int getpeermac( int sockfd, char *buf )

{

int ret =0;

struct arpreq arpreq;

struct sockaddr_in dstadd_in;

socklen_t  len = sizeof( struct sockaddr_in );

memset( &arpreq, 0, sizeof( struct arpreq ));

memset( &dstadd_in, 0, sizeof( struct sockaddr_in ));

if( getpeername( sockfd, (struct sockaddr*)&dstadd_in, &len )

err_err("getpeername()");

else

{

memcpy( &arpreq.arp_pa, &dstadd_in, sizeof( struct sockaddr_in ));

strcpy(arpreq.arp_dev, "eth1");

arpreq.arp_pa.sa_family = AF_INET;

arpreq.arp_ha.sa_family = AF_UNSPEC;

if( ioctl( sockfd, SIOCGARP, &arpreq )

err_err("ioctl SIOCGARP");

else

{

unsigned char* ptr = (unsigned char *)arpreq.arp_ha.sa_data;

ret = sprintf(buf, "%02x%02x%02x%02x%02x%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5));

}

}

return ret;

}

2。 通过IP获取：

view plaincopy to clipboardprint?

int getpeermac_by_ip(char *ipaddr, char* buf)

{

int     sockfd;

unsigned char *ptr;

struct arpreq arpreq;

struct sockaddr_in *sin;

struct sockaddr_storage ss;

char addr[INET_ADDRSTRLEN+1];

memset(addr, 0, INET_ADDRSTRLEN+1);

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

if (argc != 2) {

printf("USAGE arpg  ip_addr\n");

return -1;

}

sockfd = socket(AF_INET, SOCK_DGRAM, 0);

if (sockfd == -1) {

perror("socket error");

return -1;

}

sin = (struct sockaddr_in *) &ss;

sin->sin_family = AF_INET;

if (inet_pton(AF_INET, argv[1], &(sin->sin_addr))

perror("inet_pton error");

return -1;

}

sin = (struct sockaddr_in *) &arpreq.arp_pa;

memcpy(sin, &ss, sizeof(struct sockaddr_in));

strcpy(arpreq.arp_dev, "eth1");

arpreq.arp_ha.sa_family = AF_UNSPEC;

if (ioctl(sockfd, SIOCGARP, &arpreq)

perror("ioctl SIOCGARP: ");

return -1;

}

ptr = (unsigned char *)arpreq.arp_ha.sa_data;

sprintf(buf,"%x:%x:%x:%x:%x:%x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5));

return 0;

}