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1
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#include <stdio.h>
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2
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#include <sys/ioctl.h>
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3
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#include <net/if.h>
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4
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#include <sys/types.h>
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5
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#include <sys/socket.h>
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6
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#include <netpacket/packet.h>
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7
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#include <net/ethernet.h>
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8
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#include <stdint.h>
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9
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#include <string.h>
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10
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#include <arpa/inet.h>
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11
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#include <unistd.h>
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12
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13
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int getmac(const char *src, unsigned char *dst)
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14
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{
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15
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unsigned int n[6];
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16
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int i;
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17
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if (sscanf(src, "%x:%x:%x:%x:%x:%x",
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18
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&n[0], &n[1], &n[2], &n[3], &n[4], &n[5]) != 6) {
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19
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if(sscanf(src, "%2x%2x.%2x%2x.%2x%2x",
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20
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&n[0], &n[1], &n[2], &n[3], &n[4], &n[5]) != 6) {
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21
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return 1;
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22
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}
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23
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}
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24
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25
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for (i = 0; i < 6; i++) {
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26
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if (n[i] <= 255)
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27
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dst[i] = (unsigned char)n[i];
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28
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else
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29
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return 1;
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30
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}
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31
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32
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return 0;
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33
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}
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34
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35
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int main(int argc, char *argv[])
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36
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{
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37
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int rawsock;
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38
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uint16_t type = 0x1337;
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39
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struct ifreq req;
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40
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struct sockaddr_ll addr;
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41
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struct iovec vector[2];
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42
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char buf[256];
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43
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size_t size = 256;
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44
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struct ether_header header;
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45
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uint32_t x;
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46
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47
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if (argc != 2 && argc != 3) {
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48
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fprintf(stderr, "Usage: %s DEVICE [DST-MAC]\n", argv[0]);
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49
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return 1;
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50
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}
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51
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52
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if ((rawsock = socket(PF_PACKET, SOCK_RAW, htons(type))) < 0 ) {
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53
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fprintf(stderr, "Could not open raw socket\n");
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54
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return 1;
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55
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}
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56
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57
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strncpy(req.ifr_name, argv[1], IFNAMSIZ);
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58
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if (ioctl(rawsock, SIOCGIFINDEX, &req) < 0) {
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59
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fprintf(stderr, "Could not find device %s\n", argv[1]);
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60
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return 1;
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61
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}
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62
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63
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addr.sll_family = AF_PACKET;
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64
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addr.sll_protocol = htons(type);
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65
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addr.sll_ifindex = req.ifr_ifindex;
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66
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67
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if (bind(rawsock, (struct sockaddr *)&addr, sizeof(addr)) < 0 ) {
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68
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fprintf(stderr, "Could not bind to device %s\n", argv[1]);
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69
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return 1;
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70
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}
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71
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72
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strncpy(req.ifr_name, argv[1], IFNAMSIZ);
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73
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if (ioctl(rawsock, SIOCGIFHWADDR, &req) < 0) {
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74
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fprintf(stderr, "Could not get hwaddr of device %s\n", argv[1]);
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75
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return 1;
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76
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}
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77
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78
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if (argc == 2) {
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79
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vector[0].iov_base = &header;
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80
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vector[0].iov_len = sizeof(struct ether_header);
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81
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vector[1].iov_base = buf;
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82
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vector[1].iov_len = size;
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83
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84
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if (readv(rawsock, vector, 2) < 0) {
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85
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close(rawsock);
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86
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fprintf(stderr, "Could not receive message\n");
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87
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return 1;
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88
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}
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89
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printf("Received message\n");
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90
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} else if (argc == 3) {
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91
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for (x = 1; x < 3000; x++) {
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92
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vector[0].iov_base = &header;
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93
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vector[0].iov_len = sizeof(struct ether_header);
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94
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vector[1].iov_base = buf;
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95
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vector[1].iov_len = size;
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96
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97
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header.ether_type = htons(type);
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98
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99
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header.ether_shost[0] = 0;
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100
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header.ether_shost[1] = 0;
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101
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header.ether_shost[2] = (x >> 24) & 0xff;
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102
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header.ether_shost[3] = (x >> 16) & 0xff;
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103
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header.ether_shost[4] = (x >> 8) & 0xff;
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104
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header.ether_shost[5] = (x) & 0xff;
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105
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106
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if (getmac(argv[2], header.ether_dhost)) {
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107
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close(rawsock);
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108
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fprintf(stderr, "Could not parse mac address %s\n", argv[2]);
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109
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return 1;
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110
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}
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111
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if (writev(rawsock, vector, 2) < 0) {
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112
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close(rawsock);
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113
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fprintf(stderr, "Could not send message\n");
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114
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return 1;
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115
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}
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116
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}
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117
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}
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118
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close(rawsock);
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119
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return 0;
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120
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}
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