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
|
/*
*
* IPV4 Local Link library with GLib integration
*
* Copyright (C) 2009-2010 Aldebaran Robotics. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netpacket/packet.h>
#include <net/ethernet.h>
#include <netinet/if_ether.h>
#include <arpa/inet.h>
#include <glib.h>
#include "ipv4ll.h"
/**
* Return a random link local IP (in host byte order)
*/
uint32_t ipv4ll_random_ip(int seed)
{
unsigned tmp;
if (seed)
srand(seed);
else {
struct timeval tv;
gettimeofday(&tv, NULL);
srand(tv.tv_usec);
}
do {
tmp = rand();
tmp = tmp & IN_CLASSB_HOST;
} while (tmp > (IN_CLASSB_HOST - 0x0200));
return ntohl(((LINKLOCAL_ADDR + 0x0100) + tmp));
}
/**
* Return a random delay in range of zero to secs*1000
*/
guint ipv4ll_random_delay_ms(guint secs)
{
struct timeval tv;
guint tmp;
gettimeofday(&tv, NULL);
srand(tv.tv_usec);
tmp = rand();
return tmp % (secs * 1000);
}
int ipv4ll_send_arp_packet(uint8_t* source_eth, uint32_t source_ip,
uint32_t target_ip, int ifindex)
{
struct sockaddr_ll dest;
struct ether_arp p;
uint32_t ip_source;
uint32_t ip_target;
int fd, n;
fd = socket(PF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC, htons(ETH_P_ARP));
if (fd < 0)
return -errno;
memset(&dest, 0, sizeof(dest));
memset(&p, 0, sizeof(p));
dest.sll_family = AF_PACKET;
dest.sll_protocol = htons(ETH_P_ARP);
dest.sll_ifindex = ifindex;
dest.sll_halen = ETH_ALEN;
memset(dest.sll_addr, 0xFF, ETH_ALEN);
if (bind(fd, (struct sockaddr *)&dest, sizeof(dest)) < 0) {
close(fd);
return -errno;
}
ip_source = htonl(source_ip);
ip_target = htonl(target_ip);
p.arp_hrd = htons(ARPHRD_ETHER);
p.arp_pro = htons(ETHERTYPE_IP);
p.arp_hln = ETH_ALEN;
p.arp_pln = 4;
p.arp_op = htons(ARPOP_REQUEST);
memcpy(&p.arp_sha, source_eth, ETH_ALEN);
memcpy(&p.arp_spa, &ip_source, sizeof(p.arp_spa));
memcpy(&p.arp_tpa, &ip_target, sizeof(p.arp_tpa));
n = sendto(fd, &p, sizeof(p), 0,
(struct sockaddr*) &dest, sizeof(dest));
if (n < 0)
return -errno;
close(fd);
return n;
}
int ipv4ll_arp_socket(int ifindex)
{
int fd;
struct sockaddr_ll sock;
fd = socket(PF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC, htons(ETH_P_ARP));
if (fd < 0)
return fd;
sock.sll_family = AF_PACKET;
sock.sll_protocol = htons(ETH_P_ARP);
sock.sll_ifindex = ifindex;
if (bind(fd, (struct sockaddr *) &sock, sizeof(sock)) != 0) {
close(fd);
return -errno;
}
return fd;
}
|
