发送arp包获取mac

#include <iostream>#include <sys/socket.h>#include <sys/ioctl.h>#include <netinet/if_ether.h>#include <netinet/in.h>#include <netinet/ip.h>#include <netinet/udp.h>#include <netinet/tcp.h>#include <net/if.h>#include <memory.h>#include <arpa/inet.h>using namespace std;enum{ARP_MSG_SIZE = 0x2a};char * strncpy_IFNAMSIZ(char * dst, const char * src){# ifndef IFNAMSIZenum{IFNAMSIZ = 16};# endifreturn 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 sender's hardware address */uint8_t sInaddr[4]; /* 1c sender's IP address */uint8_t tHaddr[6]; /* 20 target's hardware address */uint8_t tInaddr[4]; /* 26 target's 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_ms;int s;int rv = 1; /* "no reply received" yet */struct sockaddr addr; /* for interface name */struct arpMsg arp;s = socket(PF_PACKET, SOCK_PACKET, htons(ETH_P_ARP));if (s == -1){perror("raw_socket");return -1;}if (setsockopt_broadcast(s) == -1){perror("cannot enable bcast on raw socket");goto ret;}/* send arp request */memset(&arp, 0, sizeof(arp));memset(arp. h_dest, 0xff, 6); /* MAC DA */memcpy(arp. h_source, from_mac, 6); /* MAC SA */arp. h_proto = htons(ETH_P_ARP); /* protocol type (Ethernet) */arp. htype = htons(ARPHRD_ETHER); /* hardware type */arp. ptype = htons(ETH_P_IP); /* protocol type (ARP message) */arp. hlen = 6; /* hardware address length */arp. plen = 4; /* protocol address length */arp. operation = htons(ARPOP_REQUEST); /* ARP op code */memcpy(arp. sHaddr, from_mac, 6); /* source hardware address */memcpy(arp. sInaddr, &from_ip, sizeof(from_ip)); /* source IP address *//* tHaddr is zero-fiiled *//* target hardware address */memcpy(arp. tInaddr, &test_ip, sizeof(test_ip)); /* target IP address */memset(&addr, 0, sizeof(addr));safe_strncpy(addr. sa_data, interface, sizeof(addr. sa_data));if (sendto(s, &arp, sizeof(arp), 0, &addr, sizeof(addr)) < 0){// TODO: error message? caller didn't expect us to fail,// just returning 1 "no reply received" misleads it.}ret: close(s);return rv;}int read_interface(const char * interface, int * ifindex, uint32_t * addr,uint8_t * arp){int fd;struct ifreq ifr;struct sockaddr_in * our_ip;memset(&ifr, 0, sizeof(ifr));fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);ifr. ifr_addr. sa_family = AF_INET;strncpy_IFNAMSIZ(ifr. ifr_name, interface);if (addr){if (ioctl(fd, SIOCGIFADDR, &ifr) != 0){perror("ioctl");close(fd);return -1;}our_ip = (struct sockaddr_in *) &ifr. ifr_addr;*addr = our_ip-> sin_addr. s_addr;printf("ip of %s = %s \n", interface, inet_ntoa(our_ip-> sin_addr));}if (ifindex){if (ioctl(fd, SIOCGIFINDEX, &ifr) != 0){close(fd);return -1;}printf("adapter index %d", ifr. ifr_ifindex);*ifindex = ifr. ifr_ifindex;}if (arp){if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0){close(fd);return -1;}memcpy(arp, ifr. ifr_hwaddr. sa_data, 6);printf("adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x\n",arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);}close(fd);return 0;}int main(void){uint32_t TEST_IP = inet_addr("10.192.64.28");char interface[] = "eth0";uint32_t ip;uint8_t mac[6];read_interface(interface, NULL, &ip, mac);while (1){arpping(TEST_IP, ip, mac, interface);sleep(1);}return 0;}

  
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