//发送端
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <unistd.h>
5 #include <errno.h>
6 #include <sys/socket.h>
7 #include <sys/ioctl.h>
8 #include <sys/types.h>
9 #include <netinet/in.h>
10 #include <netinet/ip.h>
11 #include <netinet/if_ether.h>
12 #include <net/if_arp.h>
13 #include <netpacket/packet.h>
14 #include <net/if.h>
15 #include <net/ethernet.h>
16
17 #define BUFLEN 42
18
19 int main(int argc,char** argv){
20 int skfd,n;
21 char buf[BUFLEN]={0};
22 struct ether_header *eth;
23 struct ether_arp *arp;
24 struct sockaddr_ll toaddr;
25 struct in_addr targetIP,srcIP;
26 struct ifreq ifr;
27
28 unsigned char src_mac[ETH_ALEN]={0};
29 unsigned char dst_mac[ETH_ALEN]={0xff,0xff,0xff,0xff,0xff,0xff}; //全网广播ARP请求
30 if(3 != argc){
31 printf("Usage: %s netdevName dstIP\n",argv[0]);
32 exit(1);
33 }
34
35 if(0>(skfd=socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ALL)))){
36 perror("Create Error");
37 exit(1);
38 }
39
40 bzero(&toaddr,sizeof(toaddr));
41 bzero(&ifr,sizeof(ifr));
42 strcpy(ifr.ifr_name,argv[1]);
43
44 //获取接口索引
45 if(-1 == ioctl(skfd,SIOCGIFINDEX,&ifr)){
46 perror("get dev index error:");
47 exit(1);
48 }
49 toaddr.sll_ifindex = ifr.ifr_ifindex;
50 printf("interface Index:%d\n",ifr.ifr_ifindex);
51 //获取接口IP地址
52 if(-1 == ioctl(skfd,SIOCGIFADDR,&ifr)){
53 perror("get IP addr error:");
54 exit(1);
55 }
56 srcIP.s_addr = ((struct sockaddr_in*)&(ifr.ifr_addr))->sin_addr.s_addr;
57 char IP2[64];
58 inet_ntop(AF_INET, (struct in_addr *)&srcIP, IP2, 64);
59 printf("IP addr:%s\n",IP2);
60
61 //获取接口的MAC地址
62 if(-1 == ioctl(skfd,SIOCGIFHWADDR,&ifr)){
63 perror("get dev MAC addr error:");
64 exit(1);
65 }
66
67 memcpy(src_mac,ifr.ifr_hwaddr.sa_data,ETH_ALEN);
68 printf("MAC :%02X-%02X-%02X-%02X-%02X-%02X\n",src_mac[0],src_mac[1],src_mac[2],src_mac[3],src_mac[4],src_mac[5]);
69
70
71 //开始填充，构造以太头部
72 eth=(struct ether_header*)buf;
73 memcpy(eth->ether_dhost,dst_mac,ETH_ALEN);
74 memcpy(eth->ether_shost,src_mac,ETH_ALEN);
75 eth->ether_type = htons(ETHERTYPE_ARP);
76
77 //手动开始填充用ARP报文首部
78 arp=(struct arphdr*)(buf+sizeof(struct ether_header));
79 arp->arp_hrd = htons(ARPHRD_ETHER); //硬件类型为以太
80 arp->arp_pro = htons(ETHERTYPE_IP); //硬件类型为以太
81
82 //硬件地址长度和IPV4地址长度分别是6字节和4字节
83 arp->arp_hln = ETH_ALEN;
84 arp->arp_pln = 4;
85
86 //操作码，这里我们发送ARP请求
87 arp->arp_op = htons(ARPOP_REQUEST);
88
89 //填充发送端的MAC和IP地址
90 memcpy(arp->arp_sha,src_mac,ETH_ALEN);
91 memcpy(arp->arp_spa,&srcIP,4);
92
93 //填充目的端的IP地址，MAC地址不用管
94 inet_pton(AF_INET,argv[2],&targetIP);
95 memcpy(arp->arp_tpa,&targetIP,4);
96
97 toaddr.sll_family = PF_PACKET;
98 n=sendto(skfd,buf,BUFLEN,0,(struct sockaddr*)&toaddr,sizeof(toaddr));
99
100 close(skfd);
101 return 0;
102 }
//接收端
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <unistd.h>
5 #include <errno.h>
6 #include <sys/socket.h>
7 #include <sys/ioctl.h>
8 #include <sys/types.h>
9 #include <netinet/in.h>
10 #include <netinet/ip.h>
11 #include <netinet/if_ether.h>
12 #include <net/if_arp.h>
13 #include <netpacket/packet.h>
14 #include <net/if.h>
15 #define BUFLEN 60
16
17 int main(int argc,char** argv){
18 int i,skfd,n;
19 char buf[ETH_FRAME_LEN]={0};
20 struct ethhdr *eth;
21 struct ether_arp *arp;
22 struct sockaddr_ll fromaddr;
23 struct ifreq ifr;
24
25 unsigned char src_mac[ETH_ALEN]={0};
26
27 if(2 != argc){
28 printf("Usage: %s netdevName\n",argv[0]);
29 exit(1);
30 }
31
32 //只接收发给本机的ARP报文
33 if(0>(skfd=socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ARP)))){
34 perror("Create Error");
35 exit(1);
36 }
37
38 bzero(&fromaddr,sizeof(fromaddr));
39 bzero(&ifr,sizeof(ifr));
40 strcpy(ifr.ifr_name,argv[1]);
41
42 //获取接口索引
43 if(-1 == ioctl(skfd,SIOCGIFINDEX,&ifr)){
44 perror("get dev index error:");
45 exit(1);
46 }
47 fromaddr.sll_ifindex = ifr.ifr_ifindex;
48 printf("interface Index:%d\n",ifr.ifr_ifindex);
49
50 //获取接口的MAC地址
51 if(-1 == ioctl(skfd,SIOCGIFHWADDR,&ifr)){
52 perror("get dev MAC addr error:");
53 exit(1);
54 }
55
56 memcpy(src_mac,ifr.ifr_hwaddr.sa_data,ETH_ALEN);
57 printf("MAC :%02X-%02X-%02X-%02X-%02X-%02X\n",src_mac[0],src_mac[1],src_mac[2],src_mac[3],src_mac[4],src_mac[5]);
58
59 fromaddr.sll_family = PF_PACKET;
60 fromaddr.sll_protocol=htons(ETH_P_ARP);
61 fromaddr.sll_hatype=ARPHRD_ETHER;
62 fromaddr.sll_pkttype=PACKET_HOST;
63 fromaddr.sll_halen=ETH_ALEN;
64 memcpy(fromaddr.sll_addr,src_mac,ETH_ALEN);
65
66 bind(skfd,(struct sockaddr*)&fromaddr,sizeof(struct sockaddr));
67
68 while(1){
69 memset(buf,0,ETH_FRAME_LEN);
70 n=recvfrom(skfd,buf,ETH_FRAME_LEN,0,NULL,NULL);
71
72 eth=(struct ethhdr*)buf;
73 arp=(struct ether_arp*)(buf+14);
74
75 if(ntohs(arp->arp_op)==2){
76 printf("Get an ARP replay!\n");
77 printf("Dest MAC:");
78 for(i=0;i<ETH_ALEN;i++){
79 printf("%02X-",eth->h_dest[i]);
80 }
81 printf("Sender MAC:");
82 for(i=0;i<ETH_ALEN;i++){
83 printf("%02X-",eth->h_source[i]);
84 }
85
86 printf("\n");
87 printf("Frame type:%0X\n",ntohs(eth->h_proto));
88 }
89 }
90 close(skfd);
91 return 0;
92 }
