/* 鏈路層協議 */

#endif

#include #define INLEN 4

#define MAC_BCAST_ADDR? (uint8_t *) "\xff\xff\xff\xff\xff\xff"

void usage_quit(char *arg0);

int get_ifi(char *dev, char *mac, int macln, struct in_addr *lc_addr, int ipln);

void prmac(u_char *ptr);

int main(int argc, char **argv)

{

if(argc != 2)

usage_quit(argv[0]);

int fd, salen, n;

u_char *mac;

char recv_buf[120], rep_addr[16];

struct in_addr lc_addr, req_addr;

struct sockaddr_ll reqsa, repsa;

struct arp_pkt {

struct ether_header eh;

struct ether_arp ea;

u_char padding[18];

} req;

bzero(&reqsa, sizeof(reqsa));

reqsa.sll_family = PF_PACKET;

reqsa.sll_ifindex = if_nametoindex("eth0");

if((fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ARP))) < 0) {

perror("Socket error");

exit(1);

}

mac = (char *)malloc(ETH_ALEN);

bzero(&req, sizeof(req));

if(get_ifi("eth0", mac, ETH_ALEN, &lc_addr, INLEN)) {

fprintf(stderr, "Error: Get host’s information failed\n");

exit(0);

}

printf("??????? Host MAC is: %02x:%02x:%02x:%02x:%02x:%02x\n",*mac,*(mac+1),*(mac+2),*(mac+3),*(mac+4),*(mac+5));

printf("?????? Host IP is: %s\n", inet_ntop(AF_INET, &lc_addr, rep_addr, 1024));

/* 填寫以太網頭部*/

memcpy(req.eh.ether_dhost, MAC_BCAST_ADDR, ETH_ALEN);

memcpy(req.eh.ether_shost, mac, ETH_ALEN);

req.eh.ether_type = htons(ETHERTYPE_ARP);

/* 填寫arp數據 */

req.ea.arp_hrd = htons(ARPHRD_ETHER);

req.ea.arp_pro = htons(ETHERTYPE_IP);

req.ea.arp_hln = ETH_ALEN;

req.ea.arp_pln = INLEN;

req.ea.arp_op = htons(ARPOP_REQUEST);

memcpy(req.ea.arp_sha, mac, ETH_ALEN);

memcpy(req.ea.arp_spa, &lc_addr, INLEN);

inet_aton(argv[1], req.ea.arp_tpa);

bzero(recv_buf, sizeof(recv_buf));

bzero(&repsa, sizeof(repsa));

salen = sizeof(struct sockaddr_ll);

if((n = sendto(fd, &req, sizeof(req), 0, (struct sockaddr *)&reqsa, sizeof(reqsa))) <= 0) {

perror("Sendto error");

exit(1);

}

printf("Broadcast arp request of %s, %d bytes be sent\n\n", argv[1], n);

while(1) {

if((n = recvfrom(fd, recv_buf, sizeof(req), 0, (struct sockaddr *)&repsa, &salen)) <= 0) {

perror("Recvfrom error");

exit(1);

}

if(ntohs(*(__be16 *)(recv_buf + 20))==2 && !memcmp(req.ea.arp_tpa, recv_buf + 28, 4)) {

printf("Response from %s, %d bytes received\n", argv[1], n);

printf("??????? Peer IP is: %s\n", inet_ntop(AF_INET, (struct in_addr *)(recv_buf + 28), rep_addr, 1024));

prmac( (u_char *)(recv_buf + 22) ); //prmac( (u_char *)(recv_buf + 6) );

break;

}

else

{

printf("Have recive data\n");

break;

}

}

free(mac);

}

int get_ifi(char *dev, char * mac, int macln, struct in_addr *lc_addr, int ipln)

{

int reqfd, n;

struct ifreq macreq;

reqfd = socket(AF_INET, SOCK_DGRAM, 0);

strcpy(macreq.ifr_name, dev);

/* 獲取本地接口MAC地址*/

if(ioctl(reqfd, SIOCGIFHWADDR, &macreq) != 0)

return 1;

memcpy(mac, macreq.ifr_hwaddr.sa_data, macln);

/* 獲取本地接口IP地址*/

if(ioctl(reqfd, SIOCGIFADDR, &macreq) != 0)

return 1;

memcpy(lc_addr, &((struct sockaddr_in *)(&macreq.ifr_addr))->sin_addr, ipln);

return 0;

}

void prmac(u_char *ptr)

{

printf("??????? Peer MAC is: %02x:%02x:%02x:%02x:%02x:%02x\n",*ptr,*(ptr+1),*(ptr+2),*(ptr+3),*(ptr+4),*(ptr+5));

}

void usage_quit(char *arg0)

{

fprintf(stderr, "Usage: %s \n", arg0);

exit(1);

}

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