Root/package/iwinfo/src/iwinfo_wext.c

1/*
2 * iwinfo - Wireless Information Library - Linux Wireless Extension Backend
3 *
4 * Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
5 *
6 * The iwinfo library is free software: you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 *
10 * The iwinfo library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 * See the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with the iwinfo library. If not, see http://www.gnu.org/licenses/.
17 *
18 * Parts of this code are derived from the Linux wireless tools, iwlib.c,
19 * iwlist.c and iwconfig.c in particular.
20 */
21
22#include "iwinfo.h"
23#include "iwinfo/wext.h"
24
25static double wext_freq2float(const struct iw_freq *in)
26{
27    int i;
28    double res = (double) in->m;
29    for(i = 0; i < in->e; i++) res *= 10;
30    return res;
31}
32
33static inline int wext_freq2mhz(const struct iw_freq *in)
34{
35    int i;
36
37    if( in->e == 6 )
38    {
39        return in->m;
40    }
41    else
42    {
43        return (int)(wext_freq2float(in) / 1000000);
44    }
45}
46
47static inline int wext_ioctl(const char *ifname, int cmd, struct iwreq *wrq)
48{
49    if( !strncmp(ifname, "mon.", 4) )
50        strncpy(wrq->ifr_name, &ifname[4], IFNAMSIZ);
51    else
52        strncpy(wrq->ifr_name, ifname, IFNAMSIZ);
53
54    return iwinfo_ioctl(cmd, wrq);
55}
56
57
58int wext_probe(const char *ifname)
59{
60    struct iwreq wrq;
61
62    if(wext_ioctl(ifname, SIOCGIWNAME, &wrq) >= 0)
63        return 1;
64
65    return 0;
66}
67
68void wext_close(void)
69{
70    /* Nop */
71}
72
73int wext_get_mode(const char *ifname, int *buf)
74{
75    struct iwreq wrq;
76
77    if(wext_ioctl(ifname, SIOCGIWMODE, &wrq) >= 0)
78    {
79        switch(wrq.u.mode)
80        {
81            case 1:
82                *buf = IWINFO_OPMODE_ADHOC;
83                break;
84
85            case 2:
86                *buf = IWINFO_OPMODE_CLIENT;
87                break;
88
89            case 3:
90                *buf = IWINFO_OPMODE_MASTER;
91                break;
92
93            case 6:
94                *buf = IWINFO_OPMODE_MONITOR;
95                break;
96
97            default:
98                *buf = IWINFO_OPMODE_UNKNOWN;
99                break;
100        }
101
102        return 0;
103    }
104
105    return -1;
106}
107
108int wext_get_ssid(const char *ifname, char *buf)
109{
110    struct iwreq wrq;
111
112    wrq.u.essid.pointer = (caddr_t) buf;
113    wrq.u.essid.length = IW_ESSID_MAX_SIZE + 1;
114    wrq.u.essid.flags = 0;
115
116    if(wext_ioctl(ifname, SIOCGIWESSID, &wrq) >= 0)
117        return 0;
118
119    return -1;
120}
121
122int wext_get_bssid(const char *ifname, char *buf)
123{
124    struct iwreq wrq;
125
126    if(wext_ioctl(ifname, SIOCGIWAP, &wrq) >= 0)
127    {
128        sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
129            (uint8_t)wrq.u.ap_addr.sa_data[0], (uint8_t)wrq.u.ap_addr.sa_data[1],
130            (uint8_t)wrq.u.ap_addr.sa_data[2], (uint8_t)wrq.u.ap_addr.sa_data[3],
131            (uint8_t)wrq.u.ap_addr.sa_data[4], (uint8_t)wrq.u.ap_addr.sa_data[5]);
132
133        return 0;
134    }
135
136    return -1;
137}
138
139int wext_get_bitrate(const char *ifname, int *buf)
140{
141    struct iwreq wrq;
142
143    if(wext_ioctl(ifname, SIOCGIWRATE, &wrq) >= 0)
144    {
145        *buf = (wrq.u.bitrate.value / 1000);
146        return 0;
147    }
148
149    return -1;
150}
151
152int wext_get_channel(const char *ifname, int *buf)
153{
154    struct iwreq wrq;
155    struct iw_range range;
156    double freq;
157    int i;
158
159    if(wext_ioctl(ifname, SIOCGIWFREQ, &wrq) >= 0)
160    {
161        if( wrq.u.freq.m >= 1000 )
162        {
163            freq = wext_freq2float(&wrq.u.freq);
164            wrq.u.data.pointer = (caddr_t) &range;
165            wrq.u.data.length = sizeof(struct iw_range);
166            wrq.u.data.flags = 0;
167
168            if(wext_ioctl(ifname, SIOCGIWRANGE, &wrq) >= 0)
169            {
170                for(i = 0; i < range.num_frequency; i++)
171                {
172                    if( wext_freq2float(&range.freq[i]) == freq )
173                    {
174                        *buf = range.freq[i].i;
175                        return 0;
176                    }
177                }
178            }
179        }
180        else
181        {
182            *buf = wrq.u.freq.m;
183            return 0;
184        }
185    }
186
187    return -1;
188}
189
190int wext_get_frequency(const char *ifname, int *buf)
191{
192    struct iwreq wrq;
193    struct iw_range range;
194    int i, channel;
195
196    if(wext_ioctl(ifname, SIOCGIWFREQ, &wrq) >= 0)
197    {
198        /* We got a channel number instead ... */
199        if( wrq.u.freq.m < 1000 )
200        {
201            channel = wrq.u.freq.m;
202            wrq.u.data.pointer = (caddr_t) &range;
203            wrq.u.data.length = sizeof(struct iw_range);
204            wrq.u.data.flags = 0;
205
206            if(wext_ioctl(ifname, SIOCGIWRANGE, &wrq) >= 0)
207            {
208                for(i = 0; i < range.num_frequency; i++)
209                {
210                    if( range.freq[i].i == channel )
211                    {
212                        *buf = wext_freq2mhz(&range.freq[i]);
213                        return 0;
214                    }
215                }
216            }
217        }
218        else
219        {
220            *buf = wext_freq2mhz(&wrq.u.freq);
221            return 0;
222        }
223    }
224
225    return -1;
226}
227
228int wext_get_txpower(const char *ifname, int *buf)
229{
230    struct iwreq wrq;
231
232    wrq.u.txpower.flags = 0;
233
234    if(wext_ioctl(ifname, SIOCGIWTXPOW, &wrq) >= 0)
235    {
236        if(wrq.u.txpower.flags & IW_TXPOW_MWATT)
237            *buf = iwinfo_mw2dbm(wrq.u.txpower.value);
238        else
239            *buf = wrq.u.txpower.value;
240
241        return 0;
242    }
243
244    return -1;
245}
246
247int wext_get_signal(const char *ifname, int *buf)
248{
249    struct iwreq wrq;
250    struct iw_statistics stats;
251
252    wrq.u.data.pointer = (caddr_t) &stats;
253    wrq.u.data.length = sizeof(struct iw_statistics);
254    wrq.u.data.flags = 1;
255
256    if(wext_ioctl(ifname, SIOCGIWSTATS, &wrq) >= 0)
257    {
258        *buf = (stats.qual.updated & IW_QUAL_DBM)
259            ? (stats.qual.level - 0x100) : stats.qual.level;
260
261        return 0;
262    }
263
264    return -1;
265}
266
267int wext_get_noise(const char *ifname, int *buf)
268{
269    struct iwreq wrq;
270    struct iw_statistics stats;
271
272    wrq.u.data.pointer = (caddr_t) &stats;
273    wrq.u.data.length = sizeof(struct iw_statistics);
274    wrq.u.data.flags = 1;
275
276    if(wext_ioctl(ifname, SIOCGIWSTATS, &wrq) >= 0)
277    {
278        *buf = (stats.qual.updated & IW_QUAL_DBM)
279            ? (stats.qual.noise - 0x100) : stats.qual.noise;
280
281        return 0;
282    }
283
284    return -1;
285}
286
287int wext_get_quality(const char *ifname, int *buf)
288{
289    struct iwreq wrq;
290    struct iw_statistics stats;
291
292    wrq.u.data.pointer = (caddr_t) &stats;
293    wrq.u.data.length = sizeof(struct iw_statistics);
294    wrq.u.data.flags = 1;
295
296    if(wext_ioctl(ifname, SIOCGIWSTATS, &wrq) >= 0)
297    {
298        *buf = stats.qual.qual;
299        return 0;
300    }
301
302    return -1;
303}
304
305int wext_get_quality_max(const char *ifname, int *buf)
306{
307    struct iwreq wrq;
308    struct iw_range range;
309
310    wrq.u.data.pointer = (caddr_t) &range;
311    wrq.u.data.length = sizeof(struct iw_range);
312    wrq.u.data.flags = 0;
313
314    if(wext_ioctl(ifname, SIOCGIWRANGE, &wrq) >= 0)
315    {
316        *buf = range.max_qual.qual;
317        return 0;
318    }
319
320    return -1;
321}
322
323int wext_get_assoclist(const char *ifname, char *buf, int *len)
324{
325    /* Stub */
326    return -1;
327}
328
329int wext_get_txpwrlist(const char *ifname, char *buf, int *len)
330{
331    struct iwreq wrq;
332    struct iw_range range;
333    struct iwinfo_txpwrlist_entry entry;
334    int i;
335
336    wrq.u.data.pointer = (caddr_t) &range;
337    wrq.u.data.length = sizeof(struct iw_range);
338    wrq.u.data.flags = 0;
339
340    if( (wext_ioctl(ifname, SIOCGIWRANGE, &wrq) >= 0) &&
341        (range.num_txpower > 0) && (range.num_txpower <= IW_MAX_TXPOWER) &&
342        !(range.txpower_capa & IW_TXPOW_RELATIVE)
343    ) {
344        for( i = 0; i < range.num_txpower; i++ )
345        {
346            if( range.txpower_capa & IW_TXPOW_MWATT )
347            {
348                entry.dbm = iwinfo_mw2dbm(range.txpower[i]);
349                entry.mw = range.txpower[i];
350            }
351
352            /* Madwifi does neither set mW not dBm caps, also iwlist assumes
353             * dBm if mW is not set, so don't check here... */
354            else /* if( range.txpower_capa & IW_TXPOW_DBM ) */
355            {
356                entry.dbm = range.txpower[i];
357                entry.mw = iwinfo_dbm2mw(range.txpower[i]);
358            }
359
360            memcpy(&buf[i*sizeof(entry)], &entry, sizeof(entry));
361        }
362
363        *len = i * sizeof(entry);
364        return 0;
365    }
366
367    return -1;
368}
369
370int wext_get_freqlist(const char *ifname, char *buf, int *len)
371{
372    struct iwreq wrq;
373    struct iw_range range;
374    struct iwinfo_freqlist_entry entry;
375    int i, bl;
376
377    wrq.u.data.pointer = (caddr_t) &range;
378    wrq.u.data.length = sizeof(struct iw_range);
379    wrq.u.data.flags = 0;
380
381    if(wext_ioctl(ifname, SIOCGIWRANGE, &wrq) >= 0)
382    {
383        bl = 0;
384
385        for(i = 0; i < range.num_frequency; i++)
386        {
387            entry.mhz = wext_freq2mhz(&range.freq[i]);
388            entry.channel = range.freq[i].i;
389            entry.restricted = 0;
390
391            memcpy(&buf[bl], &entry, sizeof(struct iwinfo_freqlist_entry));
392            bl += sizeof(struct iwinfo_freqlist_entry);
393        }
394
395        *len = bl;
396        return 0;
397    }
398
399    return -1;
400}
401
402int wext_get_country(const char *ifname, char *buf)
403{
404    sprintf(buf, "00");
405    return 0;
406}
407
408int wext_get_countrylist(const char *ifname, char *buf, int *len)
409{
410    /* Stub */
411    return -1;
412}
413
414int wext_get_hwmodelist(const char *ifname, int *buf)
415{
416    char chans[IWINFO_BUFSIZE] = { 0 };
417    struct iwinfo_freqlist_entry *e = NULL;
418    int len = 0;
419
420    *buf = 0;
421
422    if( !wext_get_freqlist(ifname, chans, &len) )
423    {
424        for( e = (struct iwinfo_freqlist_entry *)chans; e->channel; e++ )
425        {
426            if( e->channel <= 14 )
427            {
428                *buf |= IWINFO_80211_B;
429                *buf |= IWINFO_80211_G;
430            }
431            else
432            {
433                *buf |= IWINFO_80211_A;
434            }
435        }
436
437        return 0;
438    }
439
440    return -1;
441}
442
443int wext_get_encryption(const char *ifname, char *buf)
444{
445    /* No reliable crypto info in wext */
446    return -1;
447}
448
449int wext_get_mbssid_support(const char *ifname, int *buf)
450{
451    /* No multi bssid support atm */
452    return -1;
453}
454
455static char * wext_sysfs_ifname_file(const char *ifname, const char *path)
456{
457    FILE *f;
458    static char buf[128];
459    char *rv = NULL;
460
461    snprintf(buf, sizeof(buf), "/sys/class/net/%s/%s", ifname, path);
462
463    if ((f = fopen(buf, "r")) != NULL)
464    {
465        memset(buf, 0, sizeof(buf));
466
467        if (fread(buf, 1, sizeof(buf), f))
468            rv = buf;
469
470        fclose(f);
471    }
472
473    return rv;
474}
475
476int wext_get_hardware_id(const char *ifname, char *buf)
477{
478    char *data;
479    struct iwinfo_hardware_id *id = (struct iwinfo_hardware_id *)buf;
480
481    memset(id, 0, sizeof(struct iwinfo_hardware_id));
482
483    data = wext_sysfs_ifname_file(ifname, "device/vendor");
484    if (data)
485        id->vendor_id = strtoul(data, NULL, 16);
486
487    data = wext_sysfs_ifname_file(ifname, "device/device");
488    if (data)
489        id->device_id = strtoul(data, NULL, 16);
490
491    data = wext_sysfs_ifname_file(ifname, "device/subsystem_device");
492    if (data)
493        id->subsystem_device_id = strtoul(data, NULL, 16);
494
495    data = wext_sysfs_ifname_file(ifname, "device/subsystem_vendor");
496    if (data)
497        id->subsystem_vendor_id = strtoul(data, NULL, 16);
498
499    return (id->vendor_id > 0 && id->device_id > 0) ? 0 : -1;
500}
501
502int wext_get_hardware_name(const char *ifname, char *buf)
503{
504    sprintf(buf, "Generic WEXT");
505    return 0;
506}
507
508int wext_get_txpower_offset(const char *ifname, int *buf)
509{
510    /* Stub */
511    *buf = 0;
512    return -1;
513}
514
515int wext_get_frequency_offset(const char *ifname, int *buf)
516{
517    /* Stub */
518    *buf = 0;
519    return -1;
520}
521

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