1 // vim:ts=4:sw=4:expandtab
4 #include <yajl/yajl_gen.h>
5 #include <yajl/yajl_version.h>
10 #include <netlink/netlink.h>
11 #include <netlink/genl/genl.h>
12 #include <netlink/genl/ctrl.h>
13 #include <linux/nl80211.h>
14 #include <linux/if_ether.h>
15 #define IW_ESSID_MAX_SIZE 32
19 #define IW_ESSID_MAX_SIZE 32
23 #include <sys/param.h>
24 #include <sys/ioctl.h>
25 #include <sys/socket.h>
28 #include <net/if_media.h>
29 #include <net80211/ieee80211.h>
30 #include <net80211/ieee80211_ioctl.h>
32 #define IW_ESSID_MAX_SIZE IEEE80211_NWID_LEN
36 #include <sys/param.h>
37 #include <sys/ioctl.h>
38 #include <sys/socket.h>
41 #include <net/if_media.h>
42 #include <netproto/802_11/ieee80211.h>
43 #include <netproto/802_11/ieee80211_ioctl.h>
45 #define IW_ESSID_MAX_SIZE IEEE80211_NWID_LEN
49 #include <sys/ioctl.h>
50 #include <sys/socket.h>
52 #include <sys/types.h>
53 #include <netinet/in.h>
54 #include <netinet/if_ether.h>
55 #include <net80211/ieee80211.h>
56 #include <net80211/ieee80211_ioctl.h>
61 #define WIRELESS_INFO_FLAG_HAS_ESSID (1 << 0)
62 #define WIRELESS_INFO_FLAG_HAS_QUALITY (1 << 1)
63 #define WIRELESS_INFO_FLAG_HAS_SIGNAL (1 << 2)
64 #define WIRELESS_INFO_FLAG_HAS_NOISE (1 << 3)
65 #define WIRELESS_INFO_FLAG_HAS_FREQUENCY (1 << 4)
67 #define PERCENT_VALUE(value, total) ((int)(value * 100 / (float)total + 0.5f))
71 char essid[IW_ESSID_MAX_SIZE + 1];
73 uint8_t bssid[ETH_ALEN];
87 // Like iw_print_bitrate, but without the dependency on libiw.
88 static void print_bitrate(char *buffer, int buflen, int bitrate) {
93 const double rate = bitrate;
100 } else if (rate >= mega) {
107 snprintf(buffer, buflen, "%g %cb/s", rate / divisor, scale);
110 // Based on NetworkManager/src/platform/wifi/wifi-utils-nl80211.c
111 static uint32_t nl80211_xbm_to_percent(int32_t xbm, int32_t divisor) {
112 #define NOISE_FLOOR_DBM -90
113 #define SIGNAL_MAX_DBM -20
116 if (xbm < NOISE_FLOOR_DBM)
117 xbm = NOISE_FLOOR_DBM;
118 if (xbm > SIGNAL_MAX_DBM)
119 xbm = SIGNAL_MAX_DBM;
121 return 100 - 70 * (((float)SIGNAL_MAX_DBM - (float)xbm) / ((float)SIGNAL_MAX_DBM - (float)NOISE_FLOOR_DBM));
124 // Based on NetworkManager/src/platform/wifi/wifi-utils-nl80211.c
125 static void find_ssid(uint8_t *ies, uint32_t ies_len, uint8_t **ssid, uint32_t *ssid_len) {
126 #define WLAN_EID_SSID 0
130 while (ies_len > 2 && ies[0] != WLAN_EID_SSID) {
131 ies_len -= ies[1] + 2;
136 if (ies_len < (uint32_t)(2 + ies[1]))
143 static int gwi_sta_cb(struct nl_msg *msg, void *data) {
144 wireless_info_t *info = data;
146 struct nlattr *tb[NL80211_ATTR_MAX + 1];
147 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
148 struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
149 struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
150 static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
151 [NL80211_STA_INFO_RX_BITRATE] = {.type = NLA_NESTED},
154 static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
155 [NL80211_RATE_INFO_BITRATE] = {.type = NLA_U16},
158 if (nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL) < 0)
161 if (tb[NL80211_ATTR_STA_INFO] == NULL)
164 if (nla_parse_nested(sinfo, NL80211_STA_INFO_MAX, tb[NL80211_ATTR_STA_INFO], stats_policy))
167 if (sinfo[NL80211_STA_INFO_RX_BITRATE] == NULL)
170 if (nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX, sinfo[NL80211_STA_INFO_RX_BITRATE], rate_policy))
173 if (rinfo[NL80211_RATE_INFO_BITRATE] == NULL)
176 // NL80211_RATE_INFO_BITRATE is specified in units of 100 kbit/s, but iw
177 // used to specify bit/s, so we convert to use the same code path.
178 info->bitrate = (int)nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]) * 100 * 1000;
183 static int gwi_scan_cb(struct nl_msg *msg, void *data) {
184 wireless_info_t *info = data;
185 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
186 struct nlattr *tb[NL80211_ATTR_MAX + 1];
187 struct nlattr *bss[NL80211_BSS_MAX + 1];
188 struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
189 [NL80211_BSS_FREQUENCY] = {.type = NLA_U32},
190 [NL80211_BSS_BSSID] = {.type = NLA_UNSPEC},
191 [NL80211_BSS_INFORMATION_ELEMENTS] = {.type = NLA_UNSPEC},
192 [NL80211_BSS_SIGNAL_MBM] = {.type = NLA_U32},
193 [NL80211_BSS_SIGNAL_UNSPEC] = {.type = NLA_U8},
194 [NL80211_BSS_STATUS] = {.type = NLA_U32},
197 if (nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL) < 0)
200 if (tb[NL80211_ATTR_BSS] == NULL)
203 if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS], bss_policy))
206 if (bss[NL80211_BSS_STATUS] == NULL)
209 const uint32_t status = nla_get_u32(bss[NL80211_BSS_STATUS]);
211 if (status != NL80211_BSS_STATUS_ASSOCIATED &&
212 status != NL80211_BSS_STATUS_IBSS_JOINED)
215 if (bss[NL80211_BSS_BSSID] == NULL)
218 memcpy(info->bssid, nla_data(bss[NL80211_BSS_BSSID]), ETH_ALEN);
220 if (bss[NL80211_BSS_FREQUENCY]) {
221 info->flags |= WIRELESS_INFO_FLAG_HAS_FREQUENCY;
222 info->frequency = (double)nla_get_u32(bss[NL80211_BSS_FREQUENCY]) * 1e6;
225 if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
226 info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
227 info->signal_level = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
228 info->signal_level_max = 100;
230 info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
231 info->quality = info->signal_level;
232 info->quality_max = 100;
233 info->quality_average = 50;
236 if (bss[NL80211_BSS_SIGNAL_MBM]) {
237 info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
238 info->signal_level = (int)nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]) / 100;
240 info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
241 info->quality = nl80211_xbm_to_percent(nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]), 100);
242 info->quality_max = 100;
243 info->quality_average = 50;
246 if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) {
250 find_ssid(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
251 nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
253 if (ssid && ssid_len) {
254 info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
255 snprintf(info->essid, sizeof(info->essid), "%.*s", ssid_len, ssid);
263 static int get_wireless_info(const char *interface, wireless_info_t *info) {
264 memset(info, 0, sizeof(wireless_info_t));
267 struct nl_sock *sk = nl_socket_alloc();
268 if (genl_connect(sk) != 0)
271 if (nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, gwi_scan_cb, info) < 0)
274 const int nl80211_id = genl_ctrl_resolve(sk, "nl80211");
278 const unsigned int ifidx = if_nametoindex(interface);
282 struct nl_msg *msg = NULL;
283 if ((msg = nlmsg_alloc()) == NULL)
286 if (!genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, nl80211_id, 0, NLM_F_DUMP, NL80211_CMD_GET_SCAN, 0) ||
287 nla_put_u32(msg, NL80211_ATTR_IFINDEX, ifidx) < 0)
290 if (nl_send_sync(sk, msg) < 0)
291 // nl_send_sync calls nlmsg_free()
295 if (nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, gwi_sta_cb, info) < 0)
298 if ((msg = nlmsg_alloc()) == NULL)
301 if (!genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, nl80211_id, 0, NLM_F_DUMP, NL80211_CMD_GET_STATION, 0) || nla_put_u32(msg, NL80211_ATTR_IFINDEX, ifidx) < 0 || nla_put(msg, NL80211_ATTR_MAC, 6, info->bssid) < 0)
304 if (nl_send_sync(sk, msg) < 0)
305 // nl_send_sync calls nlmsg_free()
319 #if defined(__FreeBSD__) || defined(__DragonFly__)
322 struct ieee80211req_sta_req req;
323 uint8_t buf[24 * 1024];
325 struct ieee80211req na;
326 char bssid[IEEE80211_ADDR_LEN];
329 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
332 memset(&na, 0, sizeof(na));
333 strlcpy(na.i_name, interface, sizeof(na.i_name));
334 na.i_type = IEEE80211_IOC_SSID;
335 na.i_data = &info->essid[0];
336 na.i_len = IEEE80211_NWID_LEN + 1;
337 if ((inwid = ioctl(s, SIOCG80211, (caddr_t)&na)) == -1) {
342 if (na.i_len <= IEEE80211_NWID_LEN)
345 len = IEEE80211_NWID_LEN + 1;
346 info->essid[len - 1] = '\0';
351 info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
353 memset(&na, 0, sizeof(na));
354 strlcpy(na.i_name, interface, sizeof(na.i_name));
355 na.i_type = IEEE80211_IOC_BSSID;
357 na.i_len = sizeof(bssid);
359 if (ioctl(s, SIOCG80211, (caddr_t)&na) == -1) {
364 memcpy(u.req.is_u.macaddr, bssid, sizeof(bssid));
365 memset(&na, 0, sizeof(na));
366 strlcpy(na.i_name, interface, sizeof(na.i_name));
367 na.i_type = IEEE80211_IOC_STA_INFO;
369 na.i_len = sizeof(u);
371 if (ioctl(s, SIOCG80211, (caddr_t)&na) == -1) {
377 if (na.i_len >= sizeof(u.req)) {
379 * Just use the first BSSID returned even if there are
380 * multiple APs sharing the same BSSID.
382 info->signal_level = u.req.info[0].isi_rssi / 2 +
383 u.req.info[0].isi_noise;
384 info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
385 info->noise_level = u.req.info[0].isi_noise;
386 info->flags |= WIRELESS_INFO_FLAG_HAS_NOISE;
393 struct ieee80211_bssid bssid;
394 struct ieee80211_nwid nwid;
395 struct ieee80211_nodereq nr;
397 struct ether_addr ea;
399 int s, len, ibssid, inwid;
400 u_int8_t zero_bssid[IEEE80211_ADDR_LEN];
402 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
405 memset(&ifr, 0, sizeof(ifr));
406 ifr.ifr_data = (caddr_t)&nwid;
407 (void)strlcpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name));
408 inwid = ioctl(s, SIOCG80211NWID, (caddr_t)&ifr);
410 memset(&bssid, 0, sizeof(bssid));
411 strlcpy(bssid.i_name, interface, sizeof(bssid.i_name));
412 ibssid = ioctl(s, SIOCG80211BSSID, &bssid);
414 if (ibssid != 0 || inwid != 0) {
421 if (nwid.i_len <= IEEE80211_NWID_LEN)
422 len = nwid.i_len + 1;
424 len = IEEE80211_NWID_LEN + 1;
426 strncpy(&info->essid[0], nwid.i_nwid, len);
427 info->essid[IW_ESSID_MAX_SIZE] = '\0';
428 info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
431 /* Signal strength */
433 memset(&zero_bssid, 0, sizeof(zero_bssid));
434 if (ibssid == 0 && memcmp(bssid.i_bssid, zero_bssid, IEEE80211_ADDR_LEN) != 0) {
435 memcpy(&ea.ether_addr_octet, bssid.i_bssid, sizeof(ea.ether_addr_octet));
437 bzero(&nr, sizeof(nr));
438 bcopy(bssid.i_bssid, &nr.nr_macaddr, sizeof(nr.nr_macaddr));
439 strlcpy(nr.nr_ifname, interface, sizeof(nr.nr_ifname));
441 if (ioctl(s, SIOCG80211NODE, &nr) == 0 && nr.nr_rssi) {
442 info->signal_level = nr.nr_rssi;
444 info->signal_level_max = nr.nr_max_rssi;
446 info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
457 void print_wireless_info(yajl_gen json_gen, char *buffer, const char *interface, const char *format_up, const char *format_down) {
459 char *outwalk = buffer;
460 wireless_info_t info;
464 const char *ip_address = get_ip_addr(interface);
465 if (ip_address == NULL) {
466 START_COLOR("color_bad");
467 outwalk += sprintf(outwalk, "%s", format_down);
471 if (get_wireless_info(interface, &info)) {
473 if (info.flags & WIRELESS_INFO_FLAG_HAS_QUALITY)
474 START_COLOR((info.quality < info.quality_average ? "color_degraded" : "color_good"));
476 START_COLOR((BEGINS_WITH(ip_address, "no IP") ? "color_degraded" : "color_good"));
479 START_COLOR("color_bad");
482 for (; *walk != '\0'; walk++) {
484 *(outwalk++) = *walk;
488 if (BEGINS_WITH(walk + 1, "quality")) {
489 if (info.flags & WIRELESS_INFO_FLAG_HAS_QUALITY) {
490 if (info.quality_max)
491 outwalk += sprintf(outwalk, "%03d%s", PERCENT_VALUE(info.quality, info.quality_max), pct_mark);
493 outwalk += sprintf(outwalk, "%d", info.quality);
497 walk += strlen("quality");
500 if (BEGINS_WITH(walk + 1, "signal")) {
501 if (info.flags & WIRELESS_INFO_FLAG_HAS_SIGNAL) {
502 if (info.signal_level_max)
503 outwalk += sprintf(outwalk, "%03d%s", PERCENT_VALUE(info.signal_level, info.signal_level_max), pct_mark);
505 outwalk += sprintf(outwalk, "%d dBm", info.signal_level);
509 walk += strlen("signal");
512 if (BEGINS_WITH(walk + 1, "noise")) {
513 if (info.flags & WIRELESS_INFO_FLAG_HAS_NOISE) {
514 if (info.noise_level_max)
515 outwalk += sprintf(outwalk, "%03d%s", PERCENT_VALUE(info.noise_level, info.noise_level_max), pct_mark);
517 outwalk += sprintf(outwalk, "%d dBm", info.noise_level);
521 walk += strlen("noise");
524 if (BEGINS_WITH(walk + 1, "essid")) {
525 if (info.flags & WIRELESS_INFO_FLAG_HAS_ESSID)
526 maybe_escape_markup(info.essid, &outwalk);
529 walk += strlen("essid");
532 if (BEGINS_WITH(walk + 1, "frequency")) {
533 if (info.flags & WIRELESS_INFO_FLAG_HAS_FREQUENCY)
534 outwalk += sprintf(outwalk, "%1.1f GHz", info.frequency / 1e9);
537 walk += strlen("frequency");
540 if (BEGINS_WITH(walk + 1, "ip")) {
541 outwalk += sprintf(outwalk, "%s", ip_address);
542 walk += strlen("ip");
546 if (BEGINS_WITH(walk + 1, "bitrate")) {
549 print_bitrate(br_buffer, sizeof(br_buffer), info.bitrate);
551 outwalk += sprintf(outwalk, "%s", br_buffer);
552 walk += strlen("bitrate");
559 OUTPUT_FULL_TEXT(buffer);