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>
57 #define IW_ESSID_MAX_SIZE IEEE80211_NWID_LEN
62 #define WIRELESS_INFO_FLAG_HAS_ESSID (1 << 0)
63 #define WIRELESS_INFO_FLAG_HAS_QUALITY (1 << 1)
64 #define WIRELESS_INFO_FLAG_HAS_SIGNAL (1 << 2)
65 #define WIRELESS_INFO_FLAG_HAS_NOISE (1 << 3)
66 #define WIRELESS_INFO_FLAG_HAS_FREQUENCY (1 << 4)
68 #define PERCENT_VALUE(value, total) ((int)(value * 100 / (float)total + 0.5f))
72 char essid[IW_ESSID_MAX_SIZE + 1];
74 uint8_t bssid[ETH_ALEN];
88 // Like iw_print_bitrate, but without the dependency on libiw.
89 static void print_bitrate(char *buffer, int buflen, int bitrate) {
94 const double rate = bitrate;
101 } else if (rate >= mega) {
108 snprintf(buffer, buflen, "%g %cb/s", rate / divisor, scale);
111 // Based on NetworkManager/src/platform/wifi/wifi-utils-nl80211.c
112 static uint32_t nl80211_xbm_to_percent(int32_t xbm, int32_t divisor) {
113 #define NOISE_FLOOR_DBM -90
114 #define SIGNAL_MAX_DBM -20
117 if (xbm < NOISE_FLOOR_DBM)
118 xbm = NOISE_FLOOR_DBM;
119 if (xbm > SIGNAL_MAX_DBM)
120 xbm = SIGNAL_MAX_DBM;
122 return 100 - 70 * (((float)SIGNAL_MAX_DBM - (float)xbm) / ((float)SIGNAL_MAX_DBM - (float)NOISE_FLOOR_DBM));
125 // Based on NetworkManager/src/platform/wifi/wifi-utils-nl80211.c
126 static void find_ssid(uint8_t *ies, uint32_t ies_len, uint8_t **ssid, uint32_t *ssid_len) {
127 #define WLAN_EID_SSID 0
131 while (ies_len > 2 && ies[0] != WLAN_EID_SSID) {
132 ies_len -= ies[1] + 2;
137 if (ies_len < (uint32_t)(2 + ies[1]))
144 static int gwi_sta_cb(struct nl_msg *msg, void *data) {
145 wireless_info_t *info = data;
147 struct nlattr *tb[NL80211_ATTR_MAX + 1];
148 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
149 struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
150 struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
151 static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
152 [NL80211_STA_INFO_RX_BITRATE] = {.type = NLA_NESTED},
155 static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
156 [NL80211_RATE_INFO_BITRATE] = {.type = NLA_U16},
159 if (nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL) < 0)
162 if (tb[NL80211_ATTR_STA_INFO] == NULL)
165 if (nla_parse_nested(sinfo, NL80211_STA_INFO_MAX, tb[NL80211_ATTR_STA_INFO], stats_policy))
168 if (sinfo[NL80211_STA_INFO_RX_BITRATE] == NULL)
171 if (nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX, sinfo[NL80211_STA_INFO_RX_BITRATE], rate_policy))
174 if (rinfo[NL80211_RATE_INFO_BITRATE] == NULL)
177 // NL80211_RATE_INFO_BITRATE is specified in units of 100 kbit/s, but iw
178 // used to specify bit/s, so we convert to use the same code path.
179 info->bitrate = (int)nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]) * 100 * 1000;
184 static int gwi_scan_cb(struct nl_msg *msg, void *data) {
185 wireless_info_t *info = data;
186 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
187 struct nlattr *tb[NL80211_ATTR_MAX + 1];
188 struct nlattr *bss[NL80211_BSS_MAX + 1];
189 struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
190 [NL80211_BSS_FREQUENCY] = {.type = NLA_U32},
191 [NL80211_BSS_BSSID] = {.type = NLA_UNSPEC},
192 [NL80211_BSS_INFORMATION_ELEMENTS] = {.type = NLA_UNSPEC},
193 [NL80211_BSS_SIGNAL_MBM] = {.type = NLA_U32},
194 [NL80211_BSS_SIGNAL_UNSPEC] = {.type = NLA_U8},
195 [NL80211_BSS_STATUS] = {.type = NLA_U32},
198 if (nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL) < 0)
201 if (tb[NL80211_ATTR_BSS] == NULL)
204 if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS], bss_policy))
207 if (bss[NL80211_BSS_STATUS] == NULL)
210 const uint32_t status = nla_get_u32(bss[NL80211_BSS_STATUS]);
212 if (status != NL80211_BSS_STATUS_ASSOCIATED &&
213 status != NL80211_BSS_STATUS_IBSS_JOINED)
216 if (bss[NL80211_BSS_BSSID] == NULL)
219 memcpy(info->bssid, nla_data(bss[NL80211_BSS_BSSID]), ETH_ALEN);
221 if (bss[NL80211_BSS_FREQUENCY]) {
222 info->flags |= WIRELESS_INFO_FLAG_HAS_FREQUENCY;
223 info->frequency = (double)nla_get_u32(bss[NL80211_BSS_FREQUENCY]) * 1e6;
226 if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
227 info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
228 info->signal_level = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
229 info->signal_level_max = 100;
231 info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
232 info->quality = info->signal_level;
233 info->quality_max = 100;
234 info->quality_average = 50;
237 if (bss[NL80211_BSS_SIGNAL_MBM]) {
238 info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
239 info->signal_level = (int)nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]) / 100;
241 info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
242 info->quality = nl80211_xbm_to_percent(nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]), 100);
243 info->quality_max = 100;
244 info->quality_average = 50;
247 if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) {
251 find_ssid(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
252 nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
254 if (ssid && ssid_len) {
255 info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
256 snprintf(info->essid, sizeof(info->essid), "%.*s", ssid_len, ssid);
264 static int get_wireless_info(const char *interface, wireless_info_t *info) {
265 memset(info, 0, sizeof(wireless_info_t));
268 struct nl_sock *sk = nl_socket_alloc();
269 if (genl_connect(sk) != 0)
272 if (nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, gwi_scan_cb, info) < 0)
275 const int nl80211_id = genl_ctrl_resolve(sk, "nl80211");
279 const unsigned int ifidx = if_nametoindex(interface);
283 struct nl_msg *msg = NULL;
284 if ((msg = nlmsg_alloc()) == NULL)
287 if (!genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, nl80211_id, 0, NLM_F_DUMP, NL80211_CMD_GET_SCAN, 0) ||
288 nla_put_u32(msg, NL80211_ATTR_IFINDEX, ifidx) < 0)
291 if (nl_send_sync(sk, msg) < 0)
292 // nl_send_sync calls nlmsg_free()
296 if (nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, gwi_sta_cb, info) < 0)
299 if ((msg = nlmsg_alloc()) == NULL)
302 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)
305 if (nl_send_sync(sk, msg) < 0)
306 // nl_send_sync calls nlmsg_free()
320 #if defined(__FreeBSD__) || defined(__DragonFly__)
323 struct ieee80211req_sta_req req;
324 uint8_t buf[24 * 1024];
326 struct ieee80211req na;
327 char bssid[IEEE80211_ADDR_LEN];
330 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
333 memset(&na, 0, sizeof(na));
334 strlcpy(na.i_name, interface, sizeof(na.i_name));
335 na.i_type = IEEE80211_IOC_SSID;
336 na.i_data = &info->essid[0];
337 na.i_len = IEEE80211_NWID_LEN + 1;
338 if ((inwid = ioctl(s, SIOCG80211, (caddr_t)&na)) == -1) {
343 if (na.i_len <= IEEE80211_NWID_LEN)
346 len = IEEE80211_NWID_LEN + 1;
347 info->essid[len - 1] = '\0';
352 info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
354 memset(&na, 0, sizeof(na));
355 strlcpy(na.i_name, interface, sizeof(na.i_name));
356 na.i_type = IEEE80211_IOC_BSSID;
358 na.i_len = sizeof(bssid);
360 if (ioctl(s, SIOCG80211, (caddr_t)&na) == -1) {
365 memcpy(u.req.is_u.macaddr, bssid, sizeof(bssid));
366 memset(&na, 0, sizeof(na));
367 strlcpy(na.i_name, interface, sizeof(na.i_name));
368 na.i_type = IEEE80211_IOC_STA_INFO;
370 na.i_len = sizeof(u);
372 if (ioctl(s, SIOCG80211, (caddr_t)&na) == -1) {
378 if (na.i_len >= sizeof(u.req)) {
380 * Just use the first BSSID returned even if there are
381 * multiple APs sharing the same BSSID.
383 info->signal_level = u.req.info[0].isi_rssi / 2 +
384 u.req.info[0].isi_noise;
385 info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
386 info->noise_level = u.req.info[0].isi_noise;
387 info->flags |= WIRELESS_INFO_FLAG_HAS_NOISE;
394 struct ieee80211_bssid bssid;
395 struct ieee80211_nwid nwid;
396 struct ieee80211_nodereq nr;
398 struct ether_addr ea;
400 int s, len, ibssid, inwid;
401 u_int8_t zero_bssid[IEEE80211_ADDR_LEN];
403 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
406 memset(&ifr, 0, sizeof(ifr));
407 ifr.ifr_data = (caddr_t)&nwid;
408 (void)strlcpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name));
409 inwid = ioctl(s, SIOCG80211NWID, (caddr_t)&ifr);
411 memset(&bssid, 0, sizeof(bssid));
412 strlcpy(bssid.i_name, interface, sizeof(bssid.i_name));
413 ibssid = ioctl(s, SIOCG80211BSSID, &bssid);
415 if (ibssid != 0 || inwid != 0) {
422 if (nwid.i_len <= IEEE80211_NWID_LEN)
423 len = nwid.i_len + 1;
425 len = IEEE80211_NWID_LEN + 1;
427 strncpy(&info->essid[0], (char *)nwid.i_nwid, len);
428 info->essid[IW_ESSID_MAX_SIZE] = '\0';
429 info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
432 /* Signal strength */
434 memset(&zero_bssid, 0, sizeof(zero_bssid));
435 if (ibssid == 0 && memcmp(bssid.i_bssid, zero_bssid, IEEE80211_ADDR_LEN) != 0) {
436 memcpy(&ea.ether_addr_octet, bssid.i_bssid, sizeof(ea.ether_addr_octet));
438 bzero(&nr, sizeof(nr));
439 bcopy(bssid.i_bssid, &nr.nr_macaddr, sizeof(nr.nr_macaddr));
440 strlcpy(nr.nr_ifname, interface, sizeof(nr.nr_ifname));
442 if (ioctl(s, SIOCG80211NODE, &nr) == 0 && nr.nr_rssi) {
443 info->signal_level = nr.nr_rssi;
445 info->signal_level_max = nr.nr_max_rssi;
447 info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
458 void print_wireless_info(yajl_gen json_gen, char *buffer, const char *interface, const char *format_up, const char *format_down) {
460 char *outwalk = buffer;
461 wireless_info_t info;
465 const char *ip_address = get_ip_addr(interface);
466 if (ip_address == NULL) {
467 START_COLOR("color_bad");
468 outwalk += sprintf(outwalk, "%s", format_down);
472 if (get_wireless_info(interface, &info)) {
474 if (info.flags & WIRELESS_INFO_FLAG_HAS_QUALITY)
475 START_COLOR((info.quality < info.quality_average ? "color_degraded" : "color_good"));
477 START_COLOR((BEGINS_WITH(ip_address, "no IP") ? "color_degraded" : "color_good"));
480 START_COLOR("color_bad");
483 for (; *walk != '\0'; walk++) {
485 *(outwalk++) = *walk;
489 if (BEGINS_WITH(walk + 1, "quality")) {
490 if (info.flags & WIRELESS_INFO_FLAG_HAS_QUALITY) {
491 if (info.quality_max)
492 outwalk += sprintf(outwalk, "%03d%s", PERCENT_VALUE(info.quality, info.quality_max), pct_mark);
494 outwalk += sprintf(outwalk, "%d", info.quality);
498 walk += strlen("quality");
501 if (BEGINS_WITH(walk + 1, "signal")) {
502 if (info.flags & WIRELESS_INFO_FLAG_HAS_SIGNAL) {
503 if (info.signal_level_max)
504 outwalk += sprintf(outwalk, "%03d%s", PERCENT_VALUE(info.signal_level, info.signal_level_max), pct_mark);
506 outwalk += sprintf(outwalk, "%d dBm", info.signal_level);
510 walk += strlen("signal");
513 if (BEGINS_WITH(walk + 1, "noise")) {
514 if (info.flags & WIRELESS_INFO_FLAG_HAS_NOISE) {
515 if (info.noise_level_max)
516 outwalk += sprintf(outwalk, "%03d%s", PERCENT_VALUE(info.noise_level, info.noise_level_max), pct_mark);
518 outwalk += sprintf(outwalk, "%d dBm", info.noise_level);
522 walk += strlen("noise");
525 if (BEGINS_WITH(walk + 1, "essid")) {
526 if (info.flags & WIRELESS_INFO_FLAG_HAS_ESSID)
527 maybe_escape_markup(info.essid, &outwalk);
530 walk += strlen("essid");
533 if (BEGINS_WITH(walk + 1, "frequency")) {
534 if (info.flags & WIRELESS_INFO_FLAG_HAS_FREQUENCY)
535 outwalk += sprintf(outwalk, "%1.1f GHz", info.frequency / 1e9);
538 walk += strlen("frequency");
541 if (BEGINS_WITH(walk + 1, "ip")) {
542 outwalk += sprintf(outwalk, "%s", ip_address);
543 walk += strlen("ip");
547 if (BEGINS_WITH(walk + 1, "bitrate")) {
550 print_bitrate(br_buffer, sizeof(br_buffer), info.bitrate);
552 outwalk += sprintf(outwalk, "%s", br_buffer);
553 walk += strlen("bitrate");
560 OUTPUT_FULL_TEXT(buffer);