1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/*
*
* This is free software. You can redistribute it and/or modify under
* the terms of the GNU General Public License version 2.
*
* Copyright (C) 1998 by kra
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <netdb.h>
#include <sys/ioctl.h>
#ifdef _WITH_LINUX_KERNEL_HDR
#include <linux/if_packet.h>
#include <linux/if_ether.h>
#include <linux/if.h>
extern int socket(int domain, int type, int protocol);
#define HL_MODE_NR 0
extern char *host_lookup(unsigned int in, int use_mode);
extern int verbose;
#else
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_packet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "hunt.h"
#endif
unsigned char my_eth_mac[ETH_ALEN];
unsigned int my_eth_ip;
int tap(char *device, int promisc_mode)
{
int fd;
struct ifreq ifr; /* Link-layer interface request structure */
/* Ethernet code for IP 0x0800==ETH_P_IP */
/*
* here ETH_P_IP - je to jedno, stejne pres nej poslu ARP packet
* nevim ale jestli ho prijmu?
*/
/*
* look at tcpdump
*/
if ((fd = socket(AF_INET, SOCK_PACKET,
/*htons(ETH_P_IP)*/ htons(ETH_P_ALL))) < 0) {
if (verbose)
perror("(tap) SOCK_PACKET allocation problems [fatal]");
exit(1);
}
strncpy(ifr.ifr_name, device, IFNAMSIZ);
ifr.ifr_name[IFNAMSIZ - 1] = 0;
if ((ioctl(fd, SIOCGIFFLAGS, &ifr)) < 0) { /* Get the device info */
if (verbose)
perror("(tap) Can't get device flags [fatal]");
close(fd);
exit(1);
}
if (!promisc_mode)
ifr.ifr_flags &= ~IFF_PROMISC; /* Unset promiscuous mode */
else
ifr.ifr_flags |= IFF_PROMISC; /* Set promiscuous mode */
#if 0
if (ifr.ifr_flags & IFF_SOFTHEADERS) {
printf("had softheaders\n");
ifr.ifr_flags ^= IFF_SOFTHEADERS;
}
#endif
if ((ioctl(fd, SIOCSIFFLAGS, &ifr)) < 0) { /* Set flags */
if (verbose)
perror("(tap) Can't set/unset promiscuous mode [fatal]");
close(fd);
exit(1);
}
if(!promisc_mode){
close(fd);
return 0;
} else {
if (ioctl(fd, SIOCGIFADDR, &ifr) < 0) {
if (verbose)
perror("(tap) Can't get interface IP address");
tap(device, 0);
exit(1);
}
my_eth_ip = *(unsigned int *) (ifr.ifr_addr.sa_data + 2);
if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
if (verbose)
perror("(tap) Can't get interface HW address");
tap(device, 0);
exit(1);
}
memcpy(my_eth_mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
if (verbose) {
printf("listeining on %s %s ", device,
host_lookup(my_eth_ip, HL_MODE_NR));
print_eth_mac(my_eth_mac);
printf("\n");
}
return fd;
}
}
int get_ifc_info(char *ifc_name, unsigned int *ip, char *mac)
{
int fd;
struct ifreq ifr;
if ((fd = socket(AF_INET, SOCK_RAW, /*htons(ETH_P_IP)*/ htons(ETH_P_ALL))) < 0) {
return -1;
}
strncpy(ifr.ifr_name, ifc_name, IFNAMSIZ);
ifr.ifr_name[IFNAMSIZ - 1] = 0;
if (ip) {
if (ioctl(fd, SIOCGIFADDR, &ifr) < 0) {
close(fd);
return -1;
}
*ip = *(unsigned int *) (ifr.ifr_addr.sa_data + 2);
}
if (mac) {
if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
close(fd);
return -1;
}
memcpy(mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN);
printf("mac on %s ", ifc_name);
print_eth_mac(mac);
printf("\n");
}
close(fd);
return 0;
}
|
