aboutsummaryrefslogtreecommitdiffstats
path: root/extcap/ciscodump.c
blob: c0ff6bea80c4ec77d74f8c0d82f9d5d48dbba1ec (plain)
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
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
/* ciscodump.c
 * ciscodump is extcap tool used to capture data using a ssh on a remote cisco router
 *
 * Copyright 2015, Dario Lombardo
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <extcap/extcap-base.h>
#include <wsutil/interface.h>
#include <wsutil/strtoi.h>
#include <wsutil/filesystem.h>
#include <extcap/ssh-base.h>
#include <writecap/pcapio.h>

#include <errno.h>
#include <string.h>
#include <fcntl.h>

#define CISCODUMP_VERSION_MAJOR "1"
#define CISCODUMP_VERSION_MINOR "0"
#define CISCODUMP_VERSION_RELEASE "0"

/* The read timeout in msec */
#define CISCODUMP_READ_TIMEOUT 3000

#define CISCODUMP_EXTCAP_INTERFACE "ciscodump"
#define SSH_READ_BLOCK_SIZE 1024
#define SSH_READ_TIMEOUT 10000

#define WIRESHARK_CAPTURE_POINT "WIRESHARK_CAPTURE_POINT"
#define WIRESHARK_CAPTURE_BUFFER "WIRESHARK_CAPTURE_BUFFER"
#define WIRESHARK_CAPTURE_ACCESSLIST "WIRESHARK_CAPTURE_ACCESSLIST"

#define PCAP_SNAPLEN 0xffff

#define PACKET_MAX_SIZE 65535

#define MINIMUM_IOS_MAJOR 12
#define MINIMUM_IOS_MINOR 4

/* Status of the parser */
enum {
	CISCODUMP_PARSER_STARTING,
	CISCODUMP_PARSER_IN_PACKET,
	CISCODUMP_PARSER_IN_HEADER,
	CISCODUMP_PARSER_END_PACKET,
	CISCODUMP_PARSER_ERROR
};

enum {
	EXTCAP_BASE_OPTIONS_ENUM,
	OPT_HELP,
	OPT_VERSION,
	OPT_REMOTE_HOST,
	OPT_REMOTE_PORT,
	OPT_REMOTE_USERNAME,
	OPT_REMOTE_PASSWORD,
	OPT_REMOTE_INTERFACE,
	OPT_REMOTE_FILTER,
	OPT_SSHKEY,
	OPT_SSHKEY_PASSPHRASE,
	OPT_REMOTE_COUNT
};

static struct option longopts[] = {
	EXTCAP_BASE_OPTIONS,
	{ "help", no_argument, NULL, OPT_HELP},
	{ "version", no_argument, NULL, OPT_VERSION},
	SSH_BASE_OPTIONS,
	{ 0, 0, 0, 0}
};

static char* interfaces_list_to_filter(GSList* interfaces, unsigned int remote_port)
{
	GString* filter = g_string_new(NULL);
	GSList* cur;

	if (interfaces) {
		g_string_append_printf(filter, "deny tcp host %s any eq %u, deny tcp any eq %u host %s",
				(char*)interfaces->data, remote_port, remote_port, (char*)interfaces->data);
		cur = g_slist_next(interfaces);
		while (cur) {
			g_string_append_printf(filter, ", deny tcp host %s any eq %u, deny tcp any eq %u host %s",
				(char*)cur->data, remote_port, remote_port, (char*)cur->data);
			cur = g_slist_next(cur);
		}
		g_string_append_printf(filter, ", permit ip any any");
	}

	return g_string_free(filter, FALSE);
}

static char* local_interfaces_to_filter(const unsigned int remote_port)
{
	GSList* interfaces = local_interfaces_to_list();
	char* filter = interfaces_list_to_filter(interfaces, remote_port);
	g_slist_free_full(interfaces, g_free);
	return filter;
}

/* Read bytes from the channel. If bytes == -1, read all data (until timeout). If outbuf != NULL, data are stored there */
static int read_output_bytes(ssh_channel channel, int bytes, char* outbuf)
{
	char chr;
	int total;
	int bytes_read;

	total = (bytes > 0 ? bytes : G_MAXINT);
	bytes_read = 0;

	while(ssh_channel_read_timeout(channel, &chr, 1, 0, 2000) > 0 && bytes_read < total) {
		g_debug("%c", chr);
		if (chr == '^')
			return EXIT_FAILURE;
		if (outbuf)
			outbuf[bytes_read] = chr;
		bytes_read++;
	}
	return EXIT_SUCCESS;
}

static void ciscodump_cleanup(ssh_session sshs, ssh_channel channel, const char* iface, const char* cfilter)
{
	if (channel) {
		if (read_output_bytes(channel, -1, NULL) == EXIT_SUCCESS) {
			ssh_channel_printf(channel, "monitor capture point stop %s\n", WIRESHARK_CAPTURE_POINT);
			ssh_channel_printf(channel, "no monitor capture point ip cef %s %s\n", WIRESHARK_CAPTURE_POINT, iface);
			ssh_channel_printf(channel, "no monitor capture buffer %s\n", WIRESHARK_CAPTURE_BUFFER);
			if (cfilter) {
				ssh_channel_printf(channel, "configure terminal\n");
				ssh_channel_printf(channel, "no ip access-list ex %s\n", WIRESHARK_CAPTURE_ACCESSLIST);
			}
			read_output_bytes(channel, -1, NULL);
		}
	}
	ssh_cleanup(&sshs, &channel);
}

static int wait_until_data(ssh_channel channel, const guint32 count)
{
	long unsigned got = 0;
	char output[SSH_READ_BLOCK_SIZE];
	char* output_ptr;
	guint rounds = 100;

	while (got < count && rounds--) {
		if (ssh_channel_printf(channel, "show monitor capture buffer %s parameters\n", WIRESHARK_CAPTURE_BUFFER) == EXIT_FAILURE) {
			g_warning("Can't write to channel");
			return EXIT_FAILURE;
		}
		if (read_output_bytes(channel, SSH_READ_BLOCK_SIZE, output) == EXIT_FAILURE)
			return EXIT_FAILURE;

		output_ptr = g_strstr_len(output, strlen(output), "Packets");
		if (!output_ptr) {
			g_warning("Error in sscanf()");
			return EXIT_FAILURE;
		} else {
			if (sscanf(output_ptr, "Packets : %lu", &got) != 1)
				return EXIT_FAILURE;
		}
	}
	g_debug("All packets got: dumping");
	return EXIT_SUCCESS;
}

static int parse_line(char* packet, unsigned* offset, char* line, int status)
{
	char** parts;
	char** part;
	guint32 value;
	size_t size;

	if (strlen(line) <= 1) {
		if (status == CISCODUMP_PARSER_IN_PACKET)
			return CISCODUMP_PARSER_END_PACKET;
		else
			return status;
	}

	/* we got the packet header                                    */
	/* The packet header is a line like:                           */
	/* 16:09:37.171 ITA Mar 18 2016 : IPv4 LES CEF    : Gi0/1 None */
	if (g_regex_match_simple("^\\d{2}:\\d{2}:\\d{2}.\\d+ .*", line, G_REGEX_CASELESS, G_REGEX_MATCH_ANCHORED)) {
		return CISCODUMP_PARSER_IN_HEADER;
	}

	/* we got a line of the packet                                                          */
	/* A line looks like                                                                    */
	/* <address>: <1st group> <2nd group> <3rd group> <4th group> <ascii representation>    */
	/* ABCDEF01: 01020304 05060708 090A0B0C 0D0E0F10 ................                       */
	/* Note that any of the 4 groups are optional and that a group can be 1 to 4 bytes long */
	parts = g_regex_split_simple(
		"^[\\dA-F]{8,8}:\\s+([\\dA-F]{2,8})\\s+([\\dA-F]{2,8}){0,1}\\s+([\\dA-F]{2,8}){0,1}\\s+([\\dA-F]{2,8}){0,1}.*",
		line, G_REGEX_CASELESS, G_REGEX_MATCH_ANCHORED);

	part = parts;
	while(*part) {
		if (strlen(*part) > 1) {
			value = (guint32)strtoul(*part, NULL, 16);
			value = ntohl(value);
			size = strlen(*part) / 2;
			memcpy(packet + *offset, &value, size);
			*offset += (guint32)size;
		}
		part++;
	}
	g_strfreev(parts);
	return CISCODUMP_PARSER_IN_PACKET;
}

static void ssh_loop_read(ssh_channel channel, FILE* fp, const guint32 count)
{
	char line[SSH_READ_BLOCK_SIZE];
	char chr;
	unsigned offset = 0;
	unsigned packet_size = 0;
	char* packet;
	time_t curtime = time(NULL);
	int err;
	guint64 bytes_written;
	long unsigned packets = 0;
	int status = CISCODUMP_PARSER_STARTING;

	/* This is big enough to put on the heap */
	packet = (char*)g_malloc(PACKET_MAX_SIZE);

	do {
		if (ssh_channel_read_timeout(channel, &chr, 1, FALSE, SSH_READ_TIMEOUT) == SSH_ERROR) {
			g_warning("Error reading from channel");
			g_free(packet);
			return;
		}

		if (chr != '\n') {
			line[offset] = chr;
			offset++;
		} else {
			/* Parse the current line */
			line[offset] = '\0';
			status = parse_line(packet, &packet_size, line, status);

			if (status == CISCODUMP_PARSER_END_PACKET) {
				/* dump the packet to the pcap file */
				libpcap_write_packet(fp, curtime, (guint32)(curtime / 1000), packet_size, packet_size, packet, &bytes_written, &err);
				g_debug("Dumped packet %lu size: %u", packets, packet_size);
				packet_size = 0;
				status = CISCODUMP_PARSER_STARTING;
				packets++;
			}
			offset = 0;
		}

	} while(packets < count);

	g_free(packet);
}

static int check_ios_version(ssh_channel channel)
{
	gchar* cmdline = "show version | include Cisco IOS\n";
	gchar version[255];
	guint major = 0;
	guint minor = 0;
	gchar* cur;

	memset(version, 0x0, 255);

	if (ssh_channel_write(channel, cmdline, (guint32)strlen(cmdline)) == SSH_ERROR)
		return FALSE;
	if (read_output_bytes(channel, (int)strlen(cmdline), NULL) == EXIT_FAILURE)
		return FALSE;
	if (read_output_bytes(channel, 255, version) == EXIT_FAILURE)
		return FALSE;

	cur = g_strstr_len(version, strlen(version), "Version");
	if (cur) {
		cur += strlen("Version ");
		if (sscanf(cur, "%u.%u", &major, &minor) != 2)
			return FALSE;

		if ((major > MINIMUM_IOS_MAJOR) || (major == MINIMUM_IOS_MAJOR && minor >= MINIMUM_IOS_MINOR)) {
			g_debug("Current IOS Version: %u.%u", major, minor);
			if (read_output_bytes(channel, -1, NULL) == EXIT_FAILURE)
				return FALSE;
			return TRUE;
		}
	}

	g_warning("Invalid IOS version. Minimum version: 12.4, current: %u.%u", major, minor);
	return FALSE;
}

static ssh_channel run_capture(ssh_session sshs, const char* iface, const char* cfilter, const guint32 count)
{
	char* cmdline = NULL;
	ssh_channel channel;
	int ret = 0;

	channel = ssh_channel_new(sshs);
	if (!channel)
		return NULL;

	if (ssh_channel_open_session(channel) != SSH_OK)
		goto error;

	if (ssh_channel_request_pty(channel) != SSH_OK)
		goto error;

	if (ssh_channel_change_pty_size(channel, 80, 24) != SSH_OK)
		goto error;

	if (ssh_channel_request_shell(channel) != SSH_OK)
		goto error;

	if (!check_ios_version(channel))
		goto error;

	if (ssh_channel_printf(channel, "terminal length 0\n") == EXIT_FAILURE)
		goto error;

	if (ssh_channel_printf(channel, "monitor capture buffer %s max-size 9500\n", WIRESHARK_CAPTURE_BUFFER) == EXIT_FAILURE)
		goto error;

	if (ssh_channel_printf(channel, "monitor capture buffer %s limit packet-count %u\n", WIRESHARK_CAPTURE_BUFFER, count) == EXIT_FAILURE)
		goto error;

	if (cfilter) {
		gchar* multiline_filter;
		gchar* chr;

		if (ssh_channel_printf(channel, "configure terminal\n") == EXIT_FAILURE)
			goto error;

		if (ssh_channel_printf(channel, "ip access-list ex %s\n", WIRESHARK_CAPTURE_ACCESSLIST) == EXIT_FAILURE)
			goto error;

		multiline_filter = g_strdup(cfilter);
		chr = multiline_filter;
		while((chr = g_strstr_len(chr, strlen(chr), ",")) != NULL) {
			chr[0] = '\n';
			g_debug("Splitting filter into multiline");
		}
		ret = ssh_channel_write(channel, multiline_filter, (uint32_t)strlen(multiline_filter));
		g_free(multiline_filter);
		if (ret == SSH_ERROR)
			goto error;

		if (ssh_channel_printf(channel, "\nend\n") == EXIT_FAILURE)
			goto error;

		if (ssh_channel_printf(channel, "monitor capture buffer %s filter access-list %s\n",
				WIRESHARK_CAPTURE_BUFFER, WIRESHARK_CAPTURE_ACCESSLIST) == EXIT_FAILURE)
			goto error;
	}

	if (ssh_channel_printf(channel, "monitor capture point ip cef %s %s both\n", WIRESHARK_CAPTURE_POINT,
			iface) == EXIT_FAILURE)
		goto error;

	if (ssh_channel_printf(channel, "monitor capture point associate %s %s \n", WIRESHARK_CAPTURE_POINT,
			WIRESHARK_CAPTURE_BUFFER) == EXIT_FAILURE)
		goto error;

	if (ssh_channel_printf(channel, "monitor capture point start %s\n", WIRESHARK_CAPTURE_POINT) == EXIT_FAILURE)
		goto error;

	if (read_output_bytes(channel, -1, NULL) == EXIT_FAILURE)
		goto error;

	if (wait_until_data(channel, count) == EXIT_FAILURE)
		goto error;

	if (read_output_bytes(channel, -1, NULL) == EXIT_FAILURE)
		goto error;

	cmdline = g_strdup_printf("show monitor capture buffer %s dump\n", WIRESHARK_CAPTURE_BUFFER);
	if (ssh_channel_printf(channel, cmdline) == EXIT_FAILURE)
		goto error;

	if (read_output_bytes(channel, (int)strlen(cmdline), NULL) == EXIT_FAILURE)
		goto error;

	g_free(cmdline);
	return channel;
error:
	g_free(cmdline);
	g_warning("Error running ssh remote command");
	read_output_bytes(channel, -1, NULL);

	ssh_channel_close(channel);
	ssh_channel_free(channel);
	return NULL;
}

static int ssh_open_remote_connection(const char* hostname, const unsigned int port, const char* username, const char* password,
	const char* sshkey, const char* sshkey_passphrase, const char* iface, const char* cfilter,
	const guint32 count, const char* fifo)
{
	ssh_session sshs;
	ssh_channel channel;
	FILE* fp = stdout;
	guint64 bytes_written = 0;
	int err;
	int ret = EXIT_FAILURE;
	char* err_info = NULL;

	if (g_strcmp0(fifo, "-")) {
		/* Open or create the output file */
		fp = fopen(fifo, "w");
		if (!fp) {
			g_warning("Error creating output file: %s", g_strerror(errno));
			return EXIT_FAILURE;
		}
	}

	sshs = create_ssh_connection(hostname, port, username, password, sshkey, sshkey_passphrase, &err_info);
	if (!sshs) {
		g_warning("Error creating connection: %s", err_info);
		goto cleanup;
	}

	if (!libpcap_write_file_header(fp, 1, PCAP_SNAPLEN, FALSE, &bytes_written, &err)) {
		g_warning("Can't write pcap file header");
		goto cleanup;
	}

	channel = run_capture(sshs, iface, cfilter, count);
	if (!channel) {
		ret = EXIT_FAILURE;
		goto cleanup;
	}

	/* read from channel and write into fp */
	ssh_loop_read(channel, fp, count);

	/* clean up and exit */
	ciscodump_cleanup(sshs, channel, iface, cfilter);

	ret = EXIT_SUCCESS;
cleanup:
	if (fp != stdout)
		fclose(fp);

	return ret;
}

static int list_config(char *interface, unsigned int remote_port)
{
	unsigned inc = 0;
	char* ipfilter;

	if (!interface) {
		g_warning("No interface specified.");
		return EXIT_FAILURE;
	}

	if (g_strcmp0(interface, CISCODUMP_EXTCAP_INTERFACE)) {
		g_warning("interface must be %s", CISCODUMP_EXTCAP_INTERFACE);
		return EXIT_FAILURE;
	}

	ipfilter = local_interfaces_to_filter(remote_port);

	printf("arg {number=%u}{call=--remote-host}{display=Remote SSH server address}"
		"{type=string}{tooltip=The remote SSH host. It can be both "
		"an IP address or a hostname}{required=true}\n", inc++);
	printf("arg {number=%u}{call=--remote-port}{display=Remote SSH server port}"
		"{type=unsigned}{default=22}{tooltip=The remote SSH host port (1-65535)}"
		"{range=1,65535}\n", inc++);
	printf("arg {number=%u}{call=--remote-username}{display=Remote SSH server username}"
		"{type=string}{default=%s}{tooltip=The remote SSH username. If not provided, "
		"the current user will be used}\n", inc++, g_get_user_name());
	printf("arg {number=%u}{call=--remote-password}{display=Remote SSH server password}"
		"{type=password}{tooltip=The SSH password, used when other methods (SSH agent "
		"or key files) are unavailable.}\n", inc++);
	printf("arg {number=%u}{call=--sshkey}{display=Path to SSH private key}"
		"{type=fileselect}{tooltip=The path on the local filesystem of the private ssh key}\n",
		inc++);
	printf("arg {number=%u}{call--sshkey-passphrase}{display=SSH key passphrase}"
		"{type=password}{tooltip=Passphrase to unlock the SSH private key}\n",
		inc++);
	printf("arg {number=%u}{call=--remote-interface}{display=Remote interface}"
		"{type=string}{required=true}{tooltip=The remote network interface used for capture"
		"}\n", inc++);
	printf("arg {number=%u}{call=--remote-filter}{display=Remote capture filter}"
		"{type=string}{tooltip=The remote capture filter}", inc++);
	if (ipfilter)
		printf("{default=%s}", ipfilter);
	printf("\n");
	printf("arg {number=%u}{call=--remote-count}{display=Packets to capture}"
		"{type=unsigned}{required=true}{tooltip=The number of remote packets to capture.}\n",
		inc++);

	extcap_config_debug(&inc);

	g_free(ipfilter);

	return EXIT_SUCCESS;
}

int main(int argc, char **argv)
{
	int result;
	int option_idx = 0;
	char* remote_host = NULL;
	guint16 remote_port = 22;
	char* remote_username = NULL;
	char* remote_password = NULL;
	char* remote_interface = NULL;
	char* sshkey = NULL;
	char* sshkey_passphrase = NULL;
	char* remote_filter = NULL;
	guint32 count = 0;
	int ret = EXIT_FAILURE;
	extcap_parameters * extcap_conf = g_new0(extcap_parameters, 1);
	char* help_url;
	char* help_header = NULL;

#ifdef _WIN32
	WSADATA wsaData;

	attach_parent_console();
#endif  /* _WIN32 */

	help_url = data_file_url("ciscodump.html");
	extcap_base_set_util_info(extcap_conf, argv[0], CISCODUMP_VERSION_MAJOR, CISCODUMP_VERSION_MINOR,
		CISCODUMP_VERSION_RELEASE, help_url);
	g_free(help_url);
	extcap_base_register_interface(extcap_conf, CISCODUMP_EXTCAP_INTERFACE, "Cisco remote capture", 147, "Remote capture dependent DLT");

	help_header = g_strdup_printf(
		" %s --extcap-interfaces\n"
		" %s --extcap-interface=%s --extcap-dlts\n"
		" %s --extcap-interface=%s --extcap-config\n"
		" %s --extcap-interface=%s --remote-host myhost --remote-port 22222 "
		"--remote-username myuser --remote-interface gigabit0/0 "
		"--fifo=FILENAME --capture\n", argv[0], argv[0], CISCODUMP_EXTCAP_INTERFACE, argv[0],
		CISCODUMP_EXTCAP_INTERFACE, argv[0], CISCODUMP_EXTCAP_INTERFACE);
	extcap_help_add_header(extcap_conf, help_header);
	g_free(help_header);

	extcap_help_add_option(extcap_conf, "--help", "print this help");
	extcap_help_add_option(extcap_conf, "--version", "print the version");
	extcap_help_add_option(extcap_conf, "--remote-host <host>", "the remote SSH host");
	extcap_help_add_option(extcap_conf, "--remote-port <port>", "the remote SSH port (default: 22)");
	extcap_help_add_option(extcap_conf, "--remote-username <username>", "the remote SSH username (default: the current user)");
	extcap_help_add_option(extcap_conf, "--remote-password <password>", "the remote SSH password. "
		"If not specified, ssh-agent and ssh-key are used");
	extcap_help_add_option(extcap_conf, "--sshkey <public key path>", "the path of the ssh key");
	extcap_help_add_option(extcap_conf, "--sshkey-passphrase <public key passphrase>", "the passphrase to unlock public ssh");
	extcap_help_add_option(extcap_conf, "--remote-interface <iface>", "the remote capture interface");
	extcap_help_add_option(extcap_conf, "--remote-filter <filter>", "a filter for remote capture "
		"(default: don't capture data for lal interfaces IPs)");

	opterr = 0;
	optind = 0;

	if (argc == 1) {
		extcap_help_print(extcap_conf);
		goto end;
	}

	while ((result = getopt_long(argc, argv, ":", longopts, &option_idx)) != -1) {

		switch (result) {

		case OPT_HELP:
			extcap_help_print(extcap_conf);
			ret = EXIT_SUCCESS;
			goto end;

		case OPT_VERSION:
			printf("%s\n", extcap_conf->version);
			goto end;

		case OPT_REMOTE_HOST:
			g_free(remote_host);
			remote_host = g_strdup(optarg);
			break;

		case OPT_REMOTE_PORT:
			if (!ws_strtou16(optarg, NULL, &remote_port) || remote_port == 0) {
				g_warning("Invalid port: %s", optarg);
				goto end;
			}
			break;

		case OPT_REMOTE_USERNAME:
			g_free(remote_username);
			remote_username = g_strdup(optarg);
			break;

		case OPT_REMOTE_PASSWORD:
			g_free(remote_password);
			remote_password = g_strdup(optarg);
			memset(optarg, 'X', strlen(optarg));
			break;

		case OPT_SSHKEY:
			g_free(sshkey);
			sshkey = g_strdup(optarg);
			break;

		case OPT_SSHKEY_PASSPHRASE:
			g_free(sshkey_passphrase);
			sshkey_passphrase = g_strdup(optarg);
			memset(optarg, 'X', strlen(optarg));
			break;

		case OPT_REMOTE_INTERFACE:
			g_free(remote_interface);
			remote_interface = g_strdup(optarg);
			break;

		case OPT_REMOTE_FILTER:
			g_free(remote_filter);
			remote_filter = g_strdup(optarg);
			break;

		case OPT_REMOTE_COUNT:
			if (!ws_strtou32(optarg, NULL, &count)) {
				g_warning("Invalid packet count: %s", optarg);
				goto end;
			}
			break;

		case ':':
			/* missing option argument */
			g_warning("Option '%s' requires an argument", argv[optind - 1]);
			break;

		default:
			if (!extcap_base_parse_options(extcap_conf, result - EXTCAP_OPT_LIST_INTERFACES, optarg)) {
				g_warning("Invalid option: %s", argv[optind - 1]);
				goto end;
			}
		}
	}

	extcap_cmdline_debug(argv, argc);

	if (optind != argc) {
		g_warning("Unexpected extra option: %s", argv[optind]);
		goto end;
	}

	if (extcap_base_handle_interface(extcap_conf)) {
		ret = EXIT_SUCCESS;
		goto end;
	}

	if (extcap_conf->show_config) {
		ret = list_config(extcap_conf->interface, remote_port);
		goto end;
	}

#ifdef _WIN32
	result = WSAStartup(MAKEWORD(1,1), &wsaData);
	if (result != 0) {
		g_warning("ERROR: WSAStartup failed with error: %d", result);
		goto end;
	}
#endif  /* _WIN32 */

	if (extcap_conf->capture) {
		if (!remote_host) {
			g_warning("Missing parameter: --remote-host");
			goto end;
		}

		if (!remote_interface) {
			g_warning("ERROR: No interface specified (--remote-interface)");
			goto end;
		}
		if (count == 0) {
			g_warning("ERROR: count of packets must be specified (--remote-count)");
			goto end;
		}

		ret = ssh_open_remote_connection(remote_host, remote_port, remote_username,
			remote_password, sshkey, sshkey_passphrase, remote_interface,
			remote_filter, count, extcap_conf->fifo);
	} else {
		g_debug("You should not come here... maybe some parameter missing?");
		ret = EXIT_FAILURE;
	}

end:
	g_free(remote_host);
	g_free(remote_username);
	g_free(remote_password);
	g_free(remote_interface);
	g_free(sshkey);
	g_free(sshkey_passphrase);
	g_free(remote_filter);
	extcap_base_cleanup(&extcap_conf);
	return ret;
}

#ifdef _WIN32
int _stdcall
WinMain (struct HINSTANCE__ *hInstance,
        struct HINSTANCE__ *hPrevInstance,
        char               *lpszCmdLine,
        int                 nCmdShow)
{
	return main(__argc, __argv);
}
#endif

/*
 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: t
 * End:
 *
 * vi: set shiftwidth=4 tabstop=4 noexpandtab:
 * :indentSize=4:tabSize=4:noTabs=false:
 */