Newer
Older
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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
/*
* host_utils.c -- utils for host
*
* Author: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
* Author: Sukru Senli sukru.senli@inteno.se
* Author: Nevadita Chatterjee nevadita.chatterjee@iopsys.eu
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE
#include "host_utils.h"
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
struct in_addr src;
struct in_addr dst;
struct sockaddr_ll me;
struct sockaddr_ll he;
int sock_fd;
typedef struct nl_req_s nl_req_t;
struct nl_req_s {
struct nlmsghdr hdr;
struct rtgenmsg gen;
};
static int
send_pack(struct in_addr *src_addr, struct in_addr *dst_addr, struct sockaddr_ll *ME, struct sockaddr_ll *HE)
{
int err;
unsigned char buf[256];
struct arphdr *ah = (struct arphdr *) buf;
unsigned char *p = (unsigned char *) (ah + 1);
ah->ar_hrd = htons(ARPHRD_ETHER);
ah->ar_pro = htons(ETH_P_IP);
ah->ar_hln = ME->sll_halen;
ah->ar_pln = 4;
ah->ar_op = htons(ARPOP_REQUEST);
p = (unsigned char *)mempcpy((void *)p, (const void *)ME->sll_addr, (size_t)ah->ar_hln);
p = (unsigned char *)mempcpy((void *)p, (const void *)src_addr, 4);
p = (unsigned char *)mempcpy((void *)p, (const void *)HE->sll_addr, (size_t)ah->ar_hln);
p = (unsigned char *)mempcpy((void *)p, (const void *)dst_addr, 4);
err = sendto(sock_fd, buf, p - buf, 0, (struct sockaddr *) HE, sizeof(*HE));
return err;
}
static bool
recv_pack(char *buf, int len, struct sockaddr_ll *FROM)
{
struct arphdr *ah = (struct arphdr *) buf;
unsigned char *p = (unsigned char *) (ah + 1);
struct in_addr src_ip, dst_ip;
/* Filter out wild packets */
if (FROM->sll_pkttype != PACKET_HOST
&& FROM->sll_pkttype != PACKET_BROADCAST
&& FROM->sll_pkttype != PACKET_MULTICAST)
return false;
/* Only these types are recognized */
if (ah->ar_op != htons(ARPOP_REPLY))
return false;
/* ARPHRD check and this darned FDDI hack here :-( */
if (ah->ar_hrd != htons(FROM->sll_hatype)
&& (FROM->sll_hatype != ARPHRD_FDDI || ah->ar_hrd != htons(ARPHRD_ETHER)))
return false;
/* Protocol must be IP. */
if (ah->ar_pro != htons(ETH_P_IP)
|| (ah->ar_pln != 4)
|| (ah->ar_hln != me.sll_halen)
|| (len < (int)(sizeof(*ah) + 2 * (4 + ah->ar_hln))))
return false;
(src_ip.s_addr) = *(uint32_t *)(p + ah->ar_hln);
(dst_ip.s_addr) = *(uint32_t *)(p + ah->ar_hln + 4 + ah->ar_hln);
if (dst.s_addr != src_ip.s_addr)
return false;
if ((src.s_addr != dst_ip.s_addr) || (memcmp(p + ah->ar_hln + 4, &me.sll_addr, ah->ar_hln)))
return false;
return true;
}
bool
host_send_arping(const char *targetIP, const char *device, int toms, int is_recv)
{
struct sockaddr_in saddr;
struct ifreq ifr;
int probe_fd;
char packet[64];
struct sockaddr_ll from;
struct timeval timeout;
dbg("Inside %s %d\n", __func__, __LINE__);
sock_fd = socket(AF_PACKET, SOCK_DGRAM, 0);
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, device, IF_NAMESIZE);
if (ioctl(sock_fd, SIOCGIFINDEX, &ifr, sizeof(ifr)) < 0) {
close(sock_fd);
return false;
}
me.sll_family = AF_PACKET;
me.sll_ifindex = ifr.ifr_ifindex;
me.sll_protocol = htons(ETH_P_ARP);
bind(sock_fd, (struct sockaddr *) &me, sizeof(me));
socklen_t mlen = sizeof(me);
getsockname(sock_fd, (struct sockaddr *) &me, &mlen);
he = me;
memset(he.sll_addr, -1, he.sll_halen);
inet_pton(AF_INET, targetIP, &(dst.s_addr));
/* Get the sender IP address */
probe_fd = socket(AF_INET, SOCK_DGRAM, 0);
setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
socklen_t slen = sizeof(saddr);
saddr.sin_port = htons(1025);
saddr.sin_addr = dst;
connect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr));
getsockname(probe_fd, (struct sockaddr *) &saddr, &slen);
src = saddr.sin_addr;
close(probe_fd);
send_pack(&src, &dst, &me, &he);
/*Here we are just sending the arp packet and returning*/
if (is_recv != 1) {
close(sock_fd);
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
socklen_t alen = sizeof(from);
bool connected = false;
int cc = -1;
fd_set read_fds, write_fds, except_fds;
FD_ZERO(&read_fds);
FD_ZERO(&write_fds);
FD_ZERO(&except_fds);
FD_SET(sock_fd, &read_fds);
timeout.tv_sec = 0;
timeout.tv_usec = toms * 1000;
if (select(sock_fd + 1, &read_fds, &write_fds, &except_fds, &timeout) == 1)
cc = recvfrom(sock_fd, packet, sizeof(packet), 0, (struct sockaddr *) &from, &alen);
if (cc >= 0)
connected = recv_pack(packet, cc, &from);
close(sock_fd);
dbg("Inside %s %d connected %d\n", __func__, __LINE__, connected);
return connected;
}
int host_get_netlink_ip(uint8_t *mac_addr, char *ipv4_str, char *device)
{
struct rtnl_neigh *neigh;
struct nl_object *nobj;
struct nl_cache *cache;
uint32_t ifindex = 0;
struct nl_sock *sk;
int i, num;
int ret;
char *ifname = NULL;
dbg("Inside %s %d\n", __func__, __LINE__);
sk = nl_socket_alloc();
if (!sk) {
err("Unable to open nl event socket\n");
return -1;
}
if (nl_connect(sk, NETLINK_ROUTE) < 0) {
nl_socket_free(sk);
return -1;
}
ret = rtnl_neigh_alloc_cache(sk, &cache);
if (ret) {
nl_socket_free(sk);
return -1;
}
num = nl_cache_nitems(cache);
nobj = nl_cache_get_first(cache);
neigh = (struct rtnl_neigh *)nobj;
for (i = 0; i < num; i++) {
struct nl_addr *lladdr;
struct nl_addr *ipaddr;
struct ip_address ip = {0};
uint8_t hwaddr[6] = {0};
char addr_str[24];
nl_object_get((struct nl_object *) neigh);
ifindex = rtnl_neigh_get_ifindex(neigh);
lladdr = rtnl_neigh_get_lladdr(neigh);
if (lladdr)
memcpy(hwaddr, nl_addr_get_binary_addr(lladdr),
nl_addr_get_len(lladdr));
if (hwaddr_is_zero(hwaddr)) {
nl_object_put((struct nl_object *) neigh);
nobj = nl_cache_get_next(nobj);
neigh = (struct rtnl_neigh *)nobj;
continue;
}
ipaddr = rtnl_neigh_get_dst(neigh);
if (ipaddr) {
ip.family = nl_addr_get_family(ipaddr);
if (ip.family == AF_INET6) {
nl_object_put((struct nl_object *) neigh);
nobj = nl_cache_get_next(nobj);
neigh = (struct rtnl_neigh *)nobj;
continue;
}
if (ip.family == AF_INET) {
memcpy(&ip.addr, nl_addr_get_binary_addr(ipaddr),
nl_addr_get_len(ipaddr));
}
}
char *addr_s = nl_addr2str(ipaddr, addr_str, sizeof(addr_str));
if (addr_s == NULL) {
/* error */
err("nl_addr2str failed\n");
nl_object_put((struct nl_object *) neigh);
nl_cache_free(cache);
nl_socket_free(sk);
return -1;
}
ret = memcmp(hwaddr, mac_addr, 6);
if (ret == 0) {
strncpy(ipv4_str, addr_str, 24);
ifname = if_indextoname(ifindex, device);
nl_object_put((struct nl_object *) neigh);
nl_cache_free(cache);
nl_socket_free(sk);
dbg("intfname = [%s] ipv4addr= [%s] mac=["MACFMT"]\n", device, ipv4_str, MAC2STR(hwaddr));
nl_object_put((struct nl_object *) neigh);
break;
}
nl_object_put((struct nl_object *) neigh);
nobj = nl_cache_get_next(nobj);
neigh = (struct rtnl_neigh *)nobj;
}
nl_cache_free(cache);
nl_socket_free(sk);
return 0;
}
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
int host_get_netlink_ip6(uint8_t *mac_addr, struct host_node *p)
{
struct rtnl_neigh *neigh;
struct nl_object *nobj;
struct nl_cache *cache;
uint32_t ifindex = 0;
struct nl_sock *sk;
int i, num;
int ret;
char *ifname = NULL;
dbg("Inside %s %d\n", __func__, __LINE__);
sk = nl_socket_alloc();
if (!sk) {
err("Unable to open nl event socket\n");
return -1;
}
if (nl_connect(sk, NETLINK_ROUTE) < 0) {
nl_socket_free(sk);
return -1;
}
ret = rtnl_neigh_alloc_cache(sk, &cache);
if (ret) {
nl_socket_free(sk);
return -1;
}
num = nl_cache_nitems(cache);
nobj = nl_cache_get_first(cache);
neigh = (struct rtnl_neigh *)nobj;
p->ipv6addr_count = 0;
for (i = 0; i < num; i++) {
struct nl_addr *lladdr;
struct nl_addr *ipaddr;
struct ip_address ip = {0};
uint8_t hwaddr[6] = {0};
char addr_str[128];
nl_object_get((struct nl_object *) neigh);
ifindex = rtnl_neigh_get_ifindex(neigh);
lladdr = rtnl_neigh_get_lladdr(neigh);
if (lladdr)
memcpy(hwaddr, nl_addr_get_binary_addr(lladdr),
nl_addr_get_len(lladdr));
if (hwaddr_is_zero(hwaddr)) {
nl_object_put((struct nl_object *) neigh);
nobj = nl_cache_get_next(nobj);
neigh = (struct rtnl_neigh *)nobj;
continue;
}
ipaddr = rtnl_neigh_get_dst(neigh);
if (ipaddr) {
ip.family = nl_addr_get_family(ipaddr);
if (ip.family == AF_INET6) {
memcpy(&ip.addr, nl_addr_get_binary_addr(ipaddr),
nl_addr_get_len(ipaddr));
} else {
nl_object_put((struct nl_object *) neigh);
nobj = nl_cache_get_next(nobj);
neigh = (struct rtnl_neigh *)nobj;
continue;
}
}
char *addr_s = nl_addr2str(ipaddr, addr_str, sizeof(addr_str));
if (addr_s == NULL) {
/* error */
err("nl_addr2str failed\n");
nl_object_put((struct nl_object *) neigh);
nl_cache_free(cache);
nl_socket_free(sk);
return -1;
}
ret = memcmp(hwaddr, mac_addr, 6);
if (ret == 0) {
strncpy(p->ipv6addr[p->ipv6addr_count], addr_str, 128);
dbg("ipv6addr= [%s] mac=["MACFMT"]\n", p->ipv6addr[p->ipv6addr_count], MAC2STR(hwaddr));
p->ipv6addr_count = p->ipv6addr_count + 1;
}
nl_object_put((struct nl_object *) neigh);
nobj = nl_cache_get_next(nobj);
neigh = (struct rtnl_neigh *)nobj;
}
nl_cache_free(cache);
nl_socket_free(sk);
return 0;
}
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
void _E1B(uint8_t **packet_ppointer, uint8_t *memory_pointer)
{
*memory_pointer = **packet_ppointer;
(*packet_ppointer) += 1;
}
// Extract/insert 2 bytes
void _E2B(uint8_t **packet_ppointer, uint16_t *memory_pointer)
{
uint16_t mem = 0;
*(((uint8_t *) &mem) + 0) = **packet_ppointer;
(*packet_ppointer)++;
*(((uint8_t *) &mem) + 1) = **packet_ppointer;
(*packet_ppointer)++;
*memory_pointer = ntohs(mem);
}
// Extract/insert N bytes (ignore endianess)
void _EnB(uint8_t **packet_ppointer,
void *memory_pointer,
uint32_t n)
{
memcpy(memory_pointer, *packet_ppointer, n);
(*packet_ppointer) += n;
}
// count includes end-of-message tlv
uint8_t count_tlv_present_instream_unsafe(uint8_t *tlv_stream)
{
uint8_t *p = tlv_stream;
uint8_t tlv_type, count = 0;
uint16_t tlv_len = 0;
if (tlv_stream == NULL) {
err("tlv Stream is empty\n");
return 0;
}
do {
_E1B(&p, &tlv_type);
_E2B(&p, &tlv_len);
p = p + tlv_len;
count++;
} while (tlv_type != TLV_TYPE_END_OF_MESSAGE);
return count;
}
uint16_t get_tlv_packet_len(uint8_t *tlv_stream)
{
uint8_t *p;
uint8_t type;
uint16_t len;
if (tlv_stream == NULL)
return 0;
p = tlv_stream;
_E1B(&p, &type);
_E2B(&p, &len);
// tlv packet does not have length of tlv_type(1 Byte) and
// tlv_len(2 Bytes) included
return len + 3;
}
uint8_t get_tlv_packet_type(uint8_t *tlv_stream)
{
uint8_t *p;
uint8_t type;
uint16_t len;
if (tlv_stream == NULL)
return 0;
p = tlv_stream;
_E1B(&p, &type);
_E2B(&p, &len);
return type;
}