发送arp包.docx

代码来自busybox,函数询问TEST_IP的mac地址。read_interface函数通过ioctl来获取接口interface相关信息，arpping用于发送arp数据包。也可以使用s = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ARP));则地址则变成了struct sockaddr_ll addr; 在arpping中调用以下函数，则也可以发送# include unistd. h # include errno . h # include netdb. h # include signal . h # include sys/ socket . h # include sys/ poll. h # include sys/ ioctl. h # include netinet/ if_ether. h # include net/ if_arp. h # include netinet/ udp. h # include netinet/ ip. h # include stdio. h # include stdarg. h # include net/ if . h enum { ARP_MSG_SIZE = 0x2a} ; char * strncpy_IFNAMSIZ( char * dst, const char * src) { # ifndef IFNAMSIZ enum { IFNAMSIZ = 16 } ; # endif return strncpy ( dst, src, IFNAMSIZ) ; } struct arpMsg { /* Ethernet header */ uint8_t h_dest[ 6] ; /* 00 destination ether addr */ uint8_t h_source[ 6] ; /* 06 source ether addr */ uint16_t h_proto; /* 0c packet type ID field */ /* ARP packet */ uint16_t htype; /* 0e hardware type (must be ARPHRD_ETHER) */ uint16_t ptype; /* 10 protocol type (must be ETH_P_IP) */ uint8_t hlen; /* 12 hardware address length (must be 6) */ uint8_t plen; /* 13 protocol address length (must be 4) */ uint16_t operation; /* 14 ARP opcode */ uint8_t sHaddr[ 6] ; /* 16 senders hardware address */ uint8_t sInaddr[ 4] ; /* 1c senders IP address */ uint8_t tHaddr[ 6] ; /* 20 targets hardware address */ uint8_t tInaddr[ 4] ; /* 26 targets IP address */ uint8_t pad[ 18] ; /* 2a pad for min. ethernet payload (60 bytes) */ } PACKED; const int const_int_1 = 1; int setsockopt_broadcast( int fd) { return setsockopt ( fd, SOL_SOCKET, SO_BROADCAST, const_int_1, sizeof ( const_int_1) ) ; } char * safe_strncpy( char * dst, const char * src, size_t size) { if ( ! size) return dst; dst[ - - size] = \0 ; return strncpy ( dst, src, size) ; } int arpping( uint32_t test_ip, uint32_t from_ip, uint8_t * from_mac, const char * interface) { int timeout