summaryrefslogtreecommitdiff
path: root/netspeed/src/backend.c
blob: 572928ccfed9cb853f31f0d4eb1282e1831f8a8a (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
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
/*  backend.c
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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 Library 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.
 *
 *  Netspeed Applet was writen by Jörgen Scheibengruber <mfcn@gmx.de>
 *
 *  Mate Netspeed Applet migrated by Stefano Karapetsas <stefano@karapetsas.com>
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#if defined(sun) && defined(__SVR4)
#include <sys/sockio.h>
#endif

#include <glib.h>
#include <glib/gi18n.h>
#include <glibtop/netlist.h>
#include <glibtop/netload.h>

#include "backend.h"

#ifdef HAVE_IW
#include <iwlib.h>
#endif /* HAVE_IW */

#ifdef HAVE_NL

#include <errno.h>
#include <linux/netlink.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/family.h>
#include <netlink/genl/ctrl.h>
#include <netlink/attr.h>
#include <netlink/msg.h>

#include "nl80211.h"
#include "ieee80211.h"

struct nl80211_state {
    struct nl_sock *sock;
    int nl80211_id;
};

#endif /* HAVE_NL */

gboolean
is_dummy_device(const char* device)
{
	glibtop_netload netload;
	glibtop_get_netload(&netload, device);

	if (netload.if_flags & (1 << GLIBTOP_IF_FLAGS_LOOPBACK))
		return TRUE;

	/* Skip interfaces without any IPv4/IPv6 address (or
	   those with only a LINK ipv6 addr) However we need to
	   be able to exclude these while still keeping the
	   value so when they get online (with NetworkManager
	   for example) we don't get a suddent peak.  Once we're
	   able to get this, ignoring down interfaces will be
	   possible too.  */
	if (!(netload.flags & (1 << GLIBTOP_NETLOAD_ADDRESS6)
	      && netload.scope6 != GLIBTOP_IF_IN6_SCOPE_LINK)
	    && !(netload.flags & (1 << GLIBTOP_NETLOAD_ADDRESS)))
		return TRUE;

	return FALSE;
}


/* Check for all available devices. This really should be
 * portable for at least all plattforms using the gnu c lib
 * TODO: drop it, use glibtop_get_netlist directly / gchar**
 */
GList*
get_available_devices(void)
{
	glibtop_netlist buf;
	char **devices, **dev;
	GList *device_glist = NULL;

	devices = glibtop_get_netlist(&buf);

	for(dev = devices; *dev; ++dev) {
		device_glist = g_list_prepend(device_glist, g_strdup(*dev));
	}

	g_strfreev(devices);

	return device_glist;
}

const gchar*
get_default_route(void)
{
	FILE *fp;
	static char device[50];

	fp = fopen("/proc/net/route", "r");

	if (fp == NULL) return NULL;

	while (!feof(fp)) {
		char buffer[1024];
		unsigned int ip, gw, flags, ref, use, metric, mask, mtu, window, irtt;
		int retval;
		char *rv;

		rv = fgets(buffer, 1024, fp);
		if (!rv) {
			break;
		}

		retval = sscanf(buffer, "%49s %x %x %x %u %u %u %x %u %u %u",
				device, &ip, &gw, &flags, &ref, &use, &metric, &mask, &mtu, &window, &irtt);

		if (retval != 11) continue;

		if (ip == 0 && !is_dummy_device(device)) {
			fclose(fp);
			return device;
		}
	}
	fclose(fp);
	return NULL;
}

void
free_devices_list(GList *list)
{
	g_list_free_full (list, g_free);
}

/* Frees a DevInfo struct and all the stuff it contains
 */
void
free_device_info(DevInfo *devinfo)
{
	g_free(devinfo->name);
	g_free(devinfo->ip);
	g_free(devinfo->netmask);
	g_free(devinfo->ptpip);
	g_free(devinfo->ipv6);
	g_free(devinfo->essid);
#ifdef HAVE_NL
	g_free(devinfo->tx_bitrate);
	g_free(devinfo->rx_bitrate);
	g_free(devinfo->channel);
#endif /* HAVE_NL */
}

static char*
format_ipv4(guint32 ip)
{
	char *str = g_malloc(INET_ADDRSTRLEN);
	inet_ntop(AF_INET, &ip, str, INET_ADDRSTRLEN);
	return str;
}

static char*
format_ipv6(const guint8 ip[16])
{
	char *str = g_malloc(INET6_ADDRSTRLEN);
	inet_ntop(AF_INET6, ip, str, INET6_ADDRSTRLEN);
	return str;
}

/* TODO:
   these stuff are not portable because of ioctl
*/
static void
get_ptp_info(DevInfo *devinfo)
{
	int fd = -1;
	struct ifreq request = {};

	g_strlcpy(request.ifr_name, devinfo->name, sizeof request.ifr_name);

	if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
		return;

	if (ioctl(fd, SIOCGIFDSTADDR, &request) >= 0) {
		struct sockaddr_in* addr;
		addr = (struct sockaddr_in*)&request.ifr_dstaddr;
		devinfo->ptpip = format_ipv4(addr->sin_addr.s_addr);
	}

	close(fd);
}




void
get_device_info (const char *device,
                 DevInfo    *devinfo)
{
	glibtop_netload netload;
	gboolean ptp = FALSE;

	g_assert(device);

	memset(devinfo, 0, sizeof *devinfo);

	devinfo->name = g_strdup(device);
	devinfo->type = DEV_UNKNOWN;

	glibtop_get_netload(&netload, device);

	devinfo->up = (netload.if_flags & (1L << GLIBTOP_IF_FLAGS_UP) ? TRUE : FALSE);
	devinfo->running = (netload.if_flags & (1L << GLIBTOP_IF_FLAGS_RUNNING) ? TRUE : FALSE);

    if (netload.if_flags & (1L << GLIBTOP_IF_FLAGS_LOOPBACK)) {
        devinfo->type = DEV_LO;
    }
    else if (netload.if_flags & (1L << GLIBTOP_IF_FLAGS_WIRELESS)) {
        devinfo->type = DEV_WIRELESS;
    }
    else if(netload.if_flags & (1L << GLIBTOP_IF_FLAGS_POINTOPOINT)) {
        if (g_str_has_prefix(device, "plip")) {
            devinfo->type = DEV_PLIP;
        }
        else if (g_str_has_prefix(device, "sl")) {
            devinfo->type = DEV_SLIP;
        }
        else {
            devinfo->type = DEV_PPP;
        }
        ptp = TRUE;
    }
    else {
        devinfo->type = DEV_ETHERNET;
    }

    switch (devinfo->type) {
#if defined (HAVE_NL)
        case DEV_WIRELESS:
            get_wireless_info (devinfo);
            break;
#endif /* HAVE_NL */
        case DEV_LO:
            break;
#if defined (HAVE_IW)
        case DEV_WIRELESS:
            get_wireless_info (devinfo);
#endif /* HAVE_IW */
        default:
            memcpy (devinfo->hwaddr, netload.hwaddress, 8);
            break;
    }

    if (devinfo->running) {
        devinfo->ip = format_ipv4(netload.address);
        devinfo->netmask = format_ipv4(netload.subnet);
        devinfo->ipv6 = format_ipv6(netload.address6);
#if defined (HAVE_NL)
        if (devinfo->type != DEV_WIRELESS) {
            devinfo->tx = netload.bytes_out;
            devinfo->rx = netload.bytes_in;
            if (ptp)
                get_ptp_info (devinfo);
        }
#else
        devinfo->tx = netload.bytes_out;
        devinfo->rx = netload.bytes_in;
        if (ptp)
            get_ptp_info (devinfo);
#endif /* HAVE_NL */
        }
}

gboolean
compare_device_info(const DevInfo *a, const DevInfo *b)
{
	g_assert(a && b);
	g_assert(a->name && b->name);

	if (!g_str_equal(a->name, b->name)) return TRUE;
	if (a->ip && b->ip) {
		if (!g_str_equal(a->ip, b->ip)) return TRUE;
	} else {
		if (a->ip || b->ip) return TRUE;
	}
	/* Ignore hwaddr, ptpip and netmask... I think this is ok */
	if (a->up != b->up) return TRUE;
	if (a->running != b->running) return TRUE;

	return FALSE;
}
#ifdef HAVE_IW
void
get_wireless_info (DevInfo *devinfo)
{
	int fd;
	int newqual;
	wireless_info info = {0};

	fd = iw_sockets_open ();

	if (fd < 0)
		return;

	if (iw_get_basic_config (fd, devinfo->name, &info.b) < 0)
		goto out;

	if (info.b.has_essid) {
		if ((!devinfo->essid) || (strcmp (devinfo->essid, info.b.essid) != 0)) {
			devinfo->essid = g_strdup (info.b.essid);
		}
	} else {
		devinfo->essid = NULL;
	}

	if (iw_get_stats (fd, devinfo->name, &info.stats, &info.range, info.has_range) >= 0)
		info.has_stats = 1;

	if (info.has_stats) {
		if ((iw_get_range_info(fd, devinfo->name, &info.range) >= 0) && (info.range.max_qual.qual > 0)) {
			newqual = 0.5f + (100.0f * info.stats.qual.qual) / (1.0f * info.range.max_qual.qual);
		} else {
			newqual = info.stats.qual.qual;
		}

		newqual = CLAMP(newqual, 0, 100);
		if (devinfo->qual != newqual)
			devinfo->qual = newqual;

	} else {
		devinfo->qual = 0;
	}

	goto out;
out:
	if (fd != -1)
		close (fd);
}
#endif /* HAVE_IW */

#ifdef HAVE_NL
int iw_debug = 0;

static int
nl80211_init (struct nl80211_state *state)
{
    int err;

    state->sock = nl_socket_alloc ();
    if (!state->sock) {
        g_warning ("Failed to allocate netlink socket");
        return -ENOMEM;
    }

    if (genl_connect (state->sock)) {
        g_warning ("Failed to connect to generic netlink");
        err = -ENOLINK;
        goto out_handle_destroy;
    }

    nl_socket_set_buffer_size (state->sock, 8192, 8192);

    /* try to set NETLINK_EXT_ACK to 1, ignoring errors */
    err = 1;
    setsockopt (nl_socket_get_fd (state->sock), SOL_NETLINK,
                NETLINK_EXT_ACK, &err, sizeof (err));

    state->nl80211_id = genl_ctrl_resolve (state->sock, "nl80211");
    if (state->nl80211_id < 0) {
        g_warning ("nl80211 not found");
        err = -ENOENT;
        goto out_handle_destroy;
    }

    return 0;

out_handle_destroy:
    nl_socket_free (state->sock);
    return err;
}


static void
nl80211_cleanup (struct nl80211_state *state)
{
    nl_socket_free (state->sock);
}

static int
scan_cb (struct nl_msg  *msg,
         void           *arg)
{
    DevInfo *devinfo = (DevInfo*) arg;
    struct genlmsghdr *gnlh = nlmsg_data (nlmsg_hdr (msg));
    struct nlattr *tb[NL80211_ATTR_MAX + 1];
    struct nlattr *bss[NL80211_BSS_MAX + 1];
    static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
        [NL80211_BSS_TSF] = { .type = NLA_U64 },
        [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
        [NL80211_BSS_BSSID] = { },
        [NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 },
        [NL80211_BSS_CAPABILITY] = { .type = NLA_U16 },
        [NL80211_BSS_INFORMATION_ELEMENTS] = { },
        [NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
        [NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
        [NL80211_BSS_STATUS] = { .type = NLA_U32 },
        [NL80211_BSS_SEEN_MS_AGO] = { .type = NLA_U32 },
        [NL80211_BSS_BEACON_IES] = { },
    };

    /* Parse and error check. */
    nla_parse (tb, NL80211_ATTR_MAX, genlmsg_attrdata (gnlh, 0), genlmsg_attrlen (gnlh, 0), NULL);
    if (!tb[NL80211_ATTR_BSS]) {
        g_warning ("bss info missing!");
        return NL_SKIP;
    }
    if (nla_parse_nested (bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS], bss_policy)) {
        g_warning ("failed to parse nested attributes!");
        return NL_SKIP;
    }
    if (!bss[NL80211_BSS_BSSID]) return NL_SKIP;
    if (!bss[NL80211_BSS_STATUS]) return NL_SKIP;

    if (nla_get_u32 (bss[NL80211_BSS_STATUS]) != NL80211_BSS_STATUS_ASSOCIATED) return NL_SKIP;
    int len = MIN(ETH_ALEN, nla_len (bss[NL80211_BSS_BSSID]));
    memcpy (devinfo->station_mac_addr, nla_data (bss[NL80211_BSS_BSSID]), len);

    return NL_SKIP;
}

static void
parse_bitrate (struct nlattr *bitrate_attr,
               char          *buf,
               int            buflen)
{
    int rate = 0;
    char *pos = buf;
    struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
    static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
        [NL80211_RATE_INFO_BITRATE] = { .type = NLA_U16 },
        [NL80211_RATE_INFO_BITRATE32] = { .type = NLA_U32 },
        [NL80211_RATE_INFO_MCS] = { .type = NLA_U8 },
        [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG },
        [NL80211_RATE_INFO_SHORT_GI] = { .type = NLA_FLAG },
    };

    if (nla_parse_nested (rinfo, NL80211_RATE_INFO_MAX,
                          bitrate_attr, rate_policy)) {
        g_warning ("failed to parse nested rate attributes!");
        return;
    }

    if (rinfo[NL80211_RATE_INFO_BITRATE32])
        rate = nla_get_u32 (rinfo[NL80211_RATE_INFO_BITRATE32]);
    else if (rinfo[NL80211_RATE_INFO_BITRATE])
        rate = nla_get_u16 (rinfo[NL80211_RATE_INFO_BITRATE]);
    if (rate > 0)
        pos += snprintf (pos, buflen - (pos - buf),
                         _("%d.%d MBit/s"), rate / 10, rate % 10);
    else
        pos += snprintf (pos, buflen - (pos - buf), _("(unknown)"));

    if (rinfo[NL80211_RATE_INFO_MCS])
        pos += snprintf (pos, buflen - (pos - buf),
                         _(" MCS %d"), nla_get_u8 (rinfo[NL80211_RATE_INFO_MCS]));
    if (rinfo[NL80211_RATE_INFO_VHT_MCS])
        pos += snprintf (pos, buflen - (pos - buf),
                         _(" VHT-MCS %d"), nla_get_u8 (rinfo[NL80211_RATE_INFO_VHT_MCS]));
    if (rinfo[NL80211_RATE_INFO_40_MHZ_WIDTH])
        pos += snprintf (pos, buflen - (pos - buf), _(" 40MHz"));
    if (rinfo[NL80211_RATE_INFO_80_MHZ_WIDTH])
        pos += snprintf (pos, buflen - (pos - buf), _(" 80MHz"));
    if (rinfo[NL80211_RATE_INFO_80P80_MHZ_WIDTH])
        pos += snprintf (pos, buflen - (pos - buf), _(" 80P80MHz"));
    if (rinfo[NL80211_RATE_INFO_160_MHZ_WIDTH])
        pos += snprintf (pos, buflen - (pos - buf), _(" 160MHz"));
    if (rinfo[NL80211_RATE_INFO_SHORT_GI])
        pos += snprintf (pos, buflen - (pos - buf), _(" short GI)"));
    if (rinfo[NL80211_RATE_INFO_VHT_NSS])
        pos += snprintf (pos, buflen - (pos - buf),
                         _(" VHT-NSS %d"), nla_get_u8 (rinfo[NL80211_RATE_INFO_VHT_NSS]));
    if (rinfo[NL80211_RATE_INFO_HE_MCS])
        pos += snprintf (pos, buflen - (pos - buf),
                         _(" HE-MCS %d"), nla_get_u8 (rinfo[NL80211_RATE_INFO_HE_MCS]));
    if (rinfo[NL80211_RATE_INFO_HE_NSS])
        pos += snprintf(pos, buflen - (pos - buf),
                        _(" HE-NSS %d"), nla_get_u8 (rinfo[NL80211_RATE_INFO_HE_NSS]));
    if (rinfo[NL80211_RATE_INFO_HE_GI])
        pos += snprintf(pos, buflen - (pos - buf),
                        _(" HE-GI %d"), nla_get_u8 (rinfo[NL80211_RATE_INFO_HE_GI]));
    if (rinfo[NL80211_RATE_INFO_HE_DCM])
        snprintf (pos, buflen - (pos - buf),
                  _(" HE-DCM %d"), nla_get_u8 (rinfo[NL80211_RATE_INFO_HE_DCM]));
}

static int
station_cb (struct nl_msg *msg,
            void          *arg)
{
    DevInfo *devinfo = (DevInfo*) arg;
    struct nlattr *tb[NL80211_ATTR_MAX + 1];
    struct genlmsghdr *gnlh = nlmsg_data (nlmsg_hdr (msg));
    struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
    static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
        [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32 },
        [NL80211_STA_INFO_RX_BYTES] = { .type = NLA_U32 },
        [NL80211_STA_INFO_TX_BYTES] = { .type = NLA_U32 },
        [NL80211_STA_INFO_RX_PACKETS] = { .type = NLA_U32 },
        [NL80211_STA_INFO_TX_PACKETS] = { .type = NLA_U32 },
        [NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 },
        [NL80211_STA_INFO_RX_BITRATE] = { .type = NLA_NESTED },
        [NL80211_STA_INFO_TX_BITRATE] = { .type = NLA_NESTED },
        [NL80211_STA_INFO_LLID] = { .type = NLA_U16 },
        [NL80211_STA_INFO_PLID] = { .type = NLA_U16 },
        [NL80211_STA_INFO_PLINK_STATE] = { .type = NLA_U8 },
    };

    nla_parse (tb, NL80211_ATTR_MAX, genlmsg_attrdata (gnlh, 0),
               genlmsg_attrlen (gnlh, 0), NULL);

    if (!tb[NL80211_ATTR_STA_INFO]) {
        g_warning ("sta stats missing!");
        return NL_SKIP;
    }
    if (nla_parse_nested (sinfo, NL80211_STA_INFO_MAX,
                 tb[NL80211_ATTR_STA_INFO],
                 stats_policy)) {
        g_warning ("failed to parse nested attributes!\n");
        return NL_SKIP;
    }

    if (sinfo[NL80211_STA_INFO_RX_BYTES] && sinfo[NL80211_STA_INFO_RX_PACKETS]) {
        guint32 rx_bytes = nla_get_u32 (sinfo[NL80211_STA_INFO_RX_BYTES]);
        devinfo->rx = (guint64) rx_bytes;
        g_debug ("RX: %" G_GUINT32_FORMAT " bytes (%" G_GUINT32_FORMAT " packets)",
                 rx_bytes,
                 nla_get_u32 (sinfo[NL80211_STA_INFO_RX_PACKETS]));
    }
    if (sinfo[NL80211_STA_INFO_TX_BYTES] && sinfo[NL80211_STA_INFO_TX_PACKETS]) {
        guint32 tx_bytes = nla_get_u32 (sinfo[NL80211_STA_INFO_TX_BYTES]);
        devinfo->tx = (guint64) tx_bytes;
        g_debug ("TX: %" G_GUINT32_FORMAT " bytes (%" G_GUINT32_FORMAT " packets)",
                 tx_bytes,
                 nla_get_u32 (sinfo[NL80211_STA_INFO_TX_PACKETS]));
    }
    if (sinfo[NL80211_STA_INFO_SIGNAL]) {
        int8_t dBm = (int8_t)nla_get_u8 (sinfo[NL80211_STA_INFO_SIGNAL]);
        g_debug ("signal: %d dBm", dBm);
        devinfo->rssi = dBm;
        devinfo->qual =  CLAMP (2 * ((int)dBm + 100), 1, 100);
    }
    if (sinfo[NL80211_STA_INFO_RX_BITRATE]) {
        char buf[100];
        parse_bitrate (sinfo[NL80211_STA_INFO_RX_BITRATE], buf, sizeof (buf));
        g_debug ("rx bitrate: %s", buf);
        devinfo->rx_bitrate = g_strdup (buf);
    }
    if (sinfo[NL80211_STA_INFO_TX_BITRATE]) {
        char buf[100];
        parse_bitrate (sinfo[NL80211_STA_INFO_TX_BITRATE], buf, sizeof (buf));
        g_debug ("tx bitrate: %s", buf);
        devinfo->tx_bitrate = g_strdup (buf);
    }
    if (sinfo[NL80211_STA_INFO_CONNECTED_TIME]) {
        devinfo->connected_time = nla_get_u32 (sinfo[NL80211_STA_INFO_CONNECTED_TIME]);
        g_debug ("connected time: %" G_GUINT32_FORMAT " seconds", devinfo->connected_time);
    }

    return NL_SKIP;
}

static char *
channel_width_name (enum nl80211_chan_width width)
{
    switch (width) {
        case NL80211_CHAN_WIDTH_20_NOHT:
            return _("20 MHz (no HT)");
        case NL80211_CHAN_WIDTH_20:
            return _("20 MHz");
        case NL80211_CHAN_WIDTH_40:
            return _("40 MHz");
        case NL80211_CHAN_WIDTH_80:
            return _("80 MHz");
        case NL80211_CHAN_WIDTH_80P80:
            return _("80+80 MHz");
        case NL80211_CHAN_WIDTH_160:
            return _("160 MHz");
        case NL80211_CHAN_WIDTH_5:
            return _("5 MHz");
        case NL80211_CHAN_WIDTH_10:
            return _("10 MHz");
        default:
            return _("unknown");
    }
}

static int
ieee80211_frequency_to_channel (int freq)
{
    /* see 802.11-2007 17.3.8.3.2 and Annex J */
    if (freq == 2484)
        return 14;
    else if (freq < 2484)
        return (freq - 2407) / 5;
    else if (freq >= 4910 && freq <= 4980)
        return (freq - 4000) / 5;
    else if (freq <= 45000) /* DMG band lower limit */
        return (freq - 5000) / 5;
    else if (freq >= 58320 && freq <= 64800)
        return (freq - 56160) / 2160;
    else
        return 0;
}

static int
iface_cb (struct nl_msg *msg,
          void          *arg)
{
    DevInfo *devinfo = (DevInfo*) arg;
    struct genlmsghdr *gnlh = nlmsg_data (nlmsg_hdr (msg));
    struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];

    nla_parse (tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata (gnlh, 0),
               genlmsg_attrlen(gnlh, 0), NULL);

    if (tb_msg[NL80211_ATTR_MAC]) {
        int len = MIN(ETH_ALEN, nla_len (tb_msg[NL80211_ATTR_MAC]));
        memcpy (devinfo->hwaddr, nla_data (tb_msg[NL80211_ATTR_MAC]), len);
    }

    if (tb_msg[NL80211_ATTR_SSID]) {
        char buf[G_MAXUINT8];
        int len = nla_len (tb_msg[NL80211_ATTR_SSID]);
        memcpy (buf, nla_data (tb_msg[NL80211_ATTR_SSID]), len);
        buf [len] = '\0';
        devinfo->essid = g_strescape (buf, NULL);
        g_debug ("ssid: %s", buf);
    }

    if (tb_msg[NL80211_ATTR_WIPHY_FREQ]) {
        uint32_t freq = nla_get_u32 (tb_msg[NL80211_ATTR_WIPHY_FREQ]);
        char buf[100];
        char *pos = buf;

        pos += sprintf (pos, _("%d (%d MHz)"),
                        ieee80211_frequency_to_channel (freq), freq);

        if (tb_msg[NL80211_ATTR_CHANNEL_WIDTH])
            sprintf (pos, _(", width: %s"),
                     channel_width_name (nla_get_u32 (tb_msg[NL80211_ATTR_CHANNEL_WIDTH])));

        devinfo->channel = g_strdup (buf);
    }

    return NL_SKIP;
}

void
get_wireless_info (DevInfo *devinfo)
{
    struct nl80211_state nlstate = {.sock = NULL, .nl80211_id = -1};
    int err, ret;
    struct nl_msg *msg;
    signed long long devidx = 0;

    err = nl80211_init (&nlstate);
    if (err || (nlstate.nl80211_id < 0)) {
        g_warning ("failed to init netlink");
        return;
    }

    devidx = if_nametoindex (devinfo->name);

    /* Get MAC, SSID & channel info from interface message */
    msg = nlmsg_alloc ();
    if (!msg) {
        g_warning ("failed to allocate netlink message");
        goto cleanup;
    }
    genlmsg_put (msg, 0, 0, nlstate.nl80211_id, 0, NLM_F_DUMP, NL80211_CMD_GET_INTERFACE, 0);
    /* Add message attribute, which interface to use */
    nla_put_u32 (msg, NL80211_ATTR_IFINDEX, devidx);
    /* Add the callback */
    nl_socket_modify_cb (nlstate.sock, NL_CB_VALID, NL_CB_CUSTOM, iface_cb, devinfo);
    /* Send the message */
    ret = nl_send_auto (nlstate.sock, msg);
    g_debug ("NL80211_CMD_GET_INTERFACE sent %d bytes to the kernel", ret);
    /* Retrieve the kernel's answer */
    ret = nl_recvmsgs_default (nlstate.sock);
    nlmsg_free (msg);
    if (ret < 0) {
        g_warning ("failed to recive netlink message");
    }

    if (!devinfo->running)
        goto cleanup;

    /* Get station MAC from scan message */
    msg = nlmsg_alloc ();
    if (!msg) {
        g_warning ("failed to allocate netlink message");
        goto cleanup;
    }
    genlmsg_put (msg, 0, 0, nlstate.nl80211_id, 0, NLM_F_DUMP, NL80211_CMD_GET_SCAN, 0);
    /* Add message attribute, which interface to use */
    nla_put_u32 (msg, NL80211_ATTR_IFINDEX, devidx);
    /* Add the callback */
    nl_socket_modify_cb (nlstate.sock, NL_CB_VALID, NL_CB_CUSTOM, scan_cb, devinfo);
    /* Send the message */
    ret = nl_send_auto (nlstate.sock, msg);
    g_debug ("NL80211_CMD_GET_SCAN sent %d bytes to the kernel", ret);
    /* Retrieve the kernel's answer */
    ret = nl_recvmsgs_default (nlstate.sock);
    nlmsg_free (msg);
    if (ret < 0) {
        g_warning ("failed to recive netlink message");
        goto cleanup;
    }

    if (!devinfo->running)
        goto cleanup;

    /* Get in/out bitrate/rate/total, siganl quality from station message */
    msg = nlmsg_alloc ();
    if (!msg) {
        g_warning ("failed to allocate netlink message");
        goto cleanup;
    }
    genlmsg_put (msg, 0, 0, nlstate.nl80211_id, 0, NLM_F_DUMP, NL80211_CMD_GET_STATION, 0);
    /* Add message attribute, which interface to use */
    nla_put (msg, NL80211_ATTR_MAC, ETH_ALEN, devinfo->station_mac_addr);
    nla_put_u32 (msg, NL80211_ATTR_IFINDEX, devidx);
    /* Add the callback */
    nl_socket_modify_cb (nlstate.sock, NL_CB_VALID, NL_CB_CUSTOM, station_cb, devinfo);
    /* Send the message */
    ret = nl_send_auto (nlstate.sock, msg);
    g_debug ("NL80211_CMD_GET_STATION sent %d bytes to the kernel", ret);
    /* Retrieve the kernel's answer */
    ret = nl_recvmsgs_default (nlstate.sock);
    nlmsg_free (msg);
    if (ret < 0) {
        g_warning ("failed to recive netlink message");
    }

 cleanup:
    nl80211_cleanup (&nlstate);
}
#endif /* HAVE_NL */