1 // vim:ts=4:sw=4:expandtab
6 #include <yajl/yajl_gen.h>
7 #include <yajl/yajl_version.h>
8 #include <sys/socket.h>
13 #include <netlink/netlink.h>
14 #include <netlink/genl/genl.h>
15 #include <netlink/genl/ctrl.h>
16 #include <linux/nl80211.h>
17 #include <linux/if_ether.h>
18 #define IW_ESSID_MAX_SIZE 32
22 #define IW_ESSID_MAX_SIZE 32
26 #include <sys/param.h>
27 #include <sys/ioctl.h>
30 #include <net/if_media.h>
31 #include <net80211/ieee80211.h>
32 #include <net80211/ieee80211_ioctl.h>
34 #define IW_ESSID_MAX_SIZE IEEE80211_NWID_LEN
38 #include <sys/param.h>
39 #include <sys/ioctl.h>
43 #include <net/if_media.h>
44 #include <netproto/802_11/ieee80211.h>
45 #include <netproto/802_11/ieee80211_ioctl.h>
47 #define IW_ESSID_MAX_SIZE IEEE80211_NWID_LEN
51 #include <sys/ioctl.h>
53 #include <sys/select.h>
54 #include <sys/types.h>
55 #include <netinet/in.h>
56 #include <netinet/if_ether.h>
57 #include <net80211/ieee80211.h>
58 #include <net80211/ieee80211_ioctl.h>
59 #define IW_ESSID_MAX_SIZE IEEE80211_NWID_LEN
63 #include <sys/types.h>
64 #include <net80211/ieee80211.h>
65 #define IW_ESSID_MAX_SIZE IEEE80211_NWID_LEN
70 #define WIRELESS_INFO_FLAG_HAS_ESSID (1 << 0)
71 #define WIRELESS_INFO_FLAG_HAS_QUALITY (1 << 1)
72 #define WIRELESS_INFO_FLAG_HAS_SIGNAL (1 << 2)
73 #define WIRELESS_INFO_FLAG_HAS_NOISE (1 << 3)
74 #define WIRELESS_INFO_FLAG_HAS_FREQUENCY (1 << 4)
76 #define PERCENT_VALUE(value, total) ((int)(value * 100 / (float)total + 0.5f))
80 #ifdef IW_ESSID_MAX_SIZE
81 char essid[IW_ESSID_MAX_SIZE + 1];
84 uint8_t bssid[ETH_ALEN];
98 // Like iw_print_bitrate, but without the dependency on libiw.
99 static void print_bitrate(char *buffer, int buflen, int bitrate) {
100 const int kilo = 1e3;
101 const int mega = 1e6;
102 const int giga = 1e9;
104 const double rate = bitrate;
111 } else if (rate >= mega) {
118 snprintf(buffer, buflen, "%g %cb/s", rate / divisor, scale);
121 // Based on NetworkManager/src/platform/wifi/wifi-utils-nl80211.c
122 static uint32_t nl80211_xbm_to_percent(int32_t xbm, int32_t divisor) {
123 #define NOISE_FLOOR_DBM -90
124 #define SIGNAL_MAX_DBM -20
127 if (xbm < NOISE_FLOOR_DBM)
128 xbm = NOISE_FLOOR_DBM;
129 if (xbm > SIGNAL_MAX_DBM)
130 xbm = SIGNAL_MAX_DBM;
132 return 100 - 70 * (((float)SIGNAL_MAX_DBM - (float)xbm) / ((float)SIGNAL_MAX_DBM - (float)NOISE_FLOOR_DBM));
135 // Based on NetworkManager/src/platform/wifi/wifi-utils-nl80211.c
136 static void find_ssid(uint8_t *ies, uint32_t ies_len, uint8_t **ssid, uint32_t *ssid_len) {
137 #define WLAN_EID_SSID 0
141 while (ies_len > 2 && ies[0] != WLAN_EID_SSID) {
142 ies_len -= ies[1] + 2;
147 if (ies_len < (uint32_t)(2 + ies[1]))
154 static int gwi_sta_cb(struct nl_msg *msg, void *data) {
155 wireless_info_t *info = data;
157 struct nlattr *tb[NL80211_ATTR_MAX + 1];
158 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
159 struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
160 struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
161 static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
162 [NL80211_STA_INFO_RX_BITRATE] = {.type = NLA_NESTED},
165 static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
166 [NL80211_RATE_INFO_BITRATE] = {.type = NLA_U16},
169 if (nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL) < 0)
172 if (tb[NL80211_ATTR_STA_INFO] == NULL)
175 if (nla_parse_nested(sinfo, NL80211_STA_INFO_MAX, tb[NL80211_ATTR_STA_INFO], stats_policy))
178 if (sinfo[NL80211_STA_INFO_RX_BITRATE] == NULL)
181 if (nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX, sinfo[NL80211_STA_INFO_RX_BITRATE], rate_policy))
184 if (rinfo[NL80211_RATE_INFO_BITRATE] == NULL)
187 // NL80211_RATE_INFO_BITRATE is specified in units of 100 kbit/s, but iw
188 // used to specify bit/s, so we convert to use the same code path.
189 info->bitrate = (int)nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]) * 100 * 1000;
194 static int gwi_scan_cb(struct nl_msg *msg, void *data) {
195 wireless_info_t *info = data;
196 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
197 struct nlattr *tb[NL80211_ATTR_MAX + 1];
198 struct nlattr *bss[NL80211_BSS_MAX + 1];
199 struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
200 [NL80211_BSS_FREQUENCY] = {.type = NLA_U32},
201 [NL80211_BSS_BSSID] = {.type = NLA_UNSPEC},
202 [NL80211_BSS_INFORMATION_ELEMENTS] = {.type = NLA_UNSPEC},
203 [NL80211_BSS_SIGNAL_MBM] = {.type = NLA_U32},
204 [NL80211_BSS_SIGNAL_UNSPEC] = {.type = NLA_U8},
205 [NL80211_BSS_STATUS] = {.type = NLA_U32},
208 if (nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL) < 0)
211 if (tb[NL80211_ATTR_BSS] == NULL)
214 if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS], bss_policy))
217 if (bss[NL80211_BSS_STATUS] == NULL)
220 const uint32_t status = nla_get_u32(bss[NL80211_BSS_STATUS]);
222 if (status != NL80211_BSS_STATUS_ASSOCIATED &&
223 status != NL80211_BSS_STATUS_IBSS_JOINED)
226 if (bss[NL80211_BSS_BSSID] == NULL)
229 memcpy(info->bssid, nla_data(bss[NL80211_BSS_BSSID]), ETH_ALEN);
231 if (bss[NL80211_BSS_FREQUENCY]) {
232 info->flags |= WIRELESS_INFO_FLAG_HAS_FREQUENCY;
233 info->frequency = (double)nla_get_u32(bss[NL80211_BSS_FREQUENCY]) * 1e6;
236 if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
237 info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
238 info->signal_level = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
239 info->signal_level_max = 100;
241 info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
242 info->quality = info->signal_level;
243 info->quality_max = 100;
244 info->quality_average = 50;
247 if (bss[NL80211_BSS_SIGNAL_MBM]) {
248 info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
249 info->signal_level = (int)nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]) / 100;
251 info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
252 info->quality = nl80211_xbm_to_percent(nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]), 100);
253 info->quality_max = 100;
254 info->quality_average = 50;
257 if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) {
261 find_ssid(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
262 nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
264 if (ssid && ssid_len) {
265 info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
266 snprintf(info->essid, sizeof(info->essid), "%.*s", ssid_len, ssid);
274 static int get_wireless_info(const char *interface, wireless_info_t *info) {
275 memset(info, 0, sizeof(wireless_info_t));
278 struct nl_sock *sk = nl_socket_alloc();
279 if (genl_connect(sk) != 0)
282 if (nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, gwi_scan_cb, info) < 0)
285 const int nl80211_id = genl_ctrl_resolve(sk, "nl80211");
289 const unsigned int ifidx = if_nametoindex(interface);
293 struct nl_msg *msg = NULL;
294 if ((msg = nlmsg_alloc()) == NULL)
297 if (!genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, nl80211_id, 0, NLM_F_DUMP, NL80211_CMD_GET_SCAN, 0) ||
298 nla_put_u32(msg, NL80211_ATTR_IFINDEX, ifidx) < 0)
301 if (nl_send_sync(sk, msg) < 0)
302 // nl_send_sync calls nlmsg_free()
306 if (nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, gwi_sta_cb, info) < 0)
309 if ((msg = nlmsg_alloc()) == NULL)
312 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)
315 if (nl_send_sync(sk, msg) < 0)
316 // nl_send_sync calls nlmsg_free()
330 #if defined(__FreeBSD__) || defined(__DragonFly__)
333 struct ieee80211req_sta_req req;
334 uint8_t buf[24 * 1024];
336 struct ieee80211req na;
337 char bssid[IEEE80211_ADDR_LEN];
340 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
343 memset(&na, 0, sizeof(na));
344 strlcpy(na.i_name, interface, sizeof(na.i_name));
345 na.i_type = IEEE80211_IOC_SSID;
346 na.i_data = &info->essid[0];
347 na.i_len = IEEE80211_NWID_LEN + 1;
348 if ((inwid = ioctl(s, SIOCG80211, (caddr_t)&na)) == -1) {
353 if (na.i_len <= IEEE80211_NWID_LEN)
356 len = IEEE80211_NWID_LEN + 1;
357 info->essid[len - 1] = '\0';
362 info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
364 memset(&na, 0, sizeof(na));
365 strlcpy(na.i_name, interface, sizeof(na.i_name));
366 na.i_type = IEEE80211_IOC_BSSID;
368 na.i_len = sizeof(bssid);
370 if (ioctl(s, SIOCG80211, (caddr_t)&na) == -1) {
375 memcpy(u.req.is_u.macaddr, bssid, sizeof(bssid));
376 memset(&na, 0, sizeof(na));
377 strlcpy(na.i_name, interface, sizeof(na.i_name));
378 na.i_type = IEEE80211_IOC_STA_INFO;
380 na.i_len = sizeof(u);
382 if (ioctl(s, SIOCG80211, (caddr_t)&na) == -1) {
388 if (na.i_len >= sizeof(u.req)) {
390 * Just use the first BSSID returned even if there are
391 * multiple APs sharing the same BSSID.
393 info->signal_level = u.req.info[0].isi_rssi / 2 +
394 u.req.info[0].isi_noise;
395 info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
396 info->noise_level = u.req.info[0].isi_noise;
397 info->flags |= WIRELESS_INFO_FLAG_HAS_NOISE;
404 struct ieee80211_bssid bssid;
405 struct ieee80211_nwid nwid;
406 struct ieee80211_nodereq nr;
408 struct ether_addr ea;
410 int s, len, ibssid, inwid;
411 u_int8_t zero_bssid[IEEE80211_ADDR_LEN];
413 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
416 memset(&ifr, 0, sizeof(ifr));
417 ifr.ifr_data = (caddr_t)&nwid;
418 (void)strlcpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name));
419 inwid = ioctl(s, SIOCG80211NWID, (caddr_t)&ifr);
421 memset(&bssid, 0, sizeof(bssid));
422 strlcpy(bssid.i_name, interface, sizeof(bssid.i_name));
423 ibssid = ioctl(s, SIOCG80211BSSID, &bssid);
425 if (ibssid != 0 || inwid != 0) {
432 if (nwid.i_len <= IEEE80211_NWID_LEN)
433 len = nwid.i_len + 1;
435 len = IEEE80211_NWID_LEN + 1;
437 strncpy(&info->essid[0], (char *)nwid.i_nwid, len);
438 info->essid[IW_ESSID_MAX_SIZE] = '\0';
439 info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
442 /* Signal strength */
444 memset(&zero_bssid, 0, sizeof(zero_bssid));
445 if (ibssid == 0 && memcmp(bssid.i_bssid, zero_bssid, IEEE80211_ADDR_LEN) != 0) {
446 memcpy(&ea.ether_addr_octet, bssid.i_bssid, sizeof(ea.ether_addr_octet));
448 bzero(&nr, sizeof(nr));
449 bcopy(bssid.i_bssid, &nr.nr_macaddr, sizeof(nr.nr_macaddr));
450 strlcpy(nr.nr_ifname, interface, sizeof(nr.nr_ifname));
452 if (ioctl(s, SIOCG80211NODE, &nr) == 0 && nr.nr_rssi) {
453 info->signal_level = nr.nr_rssi;
455 info->signal_level_max = nr.nr_max_rssi;
457 info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
468 /* Table summarizing what is the decision to prefer IPv4 or IPv6
469 * based their values.
471 * | ipv4_address | ipv6_address | Chosen IP | Color |
472 * |--------------|--------------|-----------|-------------------|
473 * | NULL | NULL | None | bad (red) |
474 * | NULL | no IP | IPv6 | degraded (orange) |
475 * | NULL | ::1/128 | IPv6 | ok (green) |
476 * | no IP | NULL | IPv4 | degraded |
477 * | no IP | no IP | IPv4 | degraded |
478 * | no IP | ::1/128 | IPv6 | ok |
479 * | 127.0.0.1 | NULL | IPv4 | ok |
480 * | 127.0.0.1 | no IP | IPv4 | ok |
481 * | 127.0.0.1 | ::1/128 | IPv4 | ok |
483 void print_wireless_info(yajl_gen json_gen, char *buffer, const char *interface, const char *format_up, const char *format_down, const char *format_quality) {
485 char *outwalk = buffer;
486 wireless_info_t info;
490 char *ipv4_address = sstrdup(get_ip_addr(interface, AF_INET));
491 char *ipv6_address = sstrdup(get_ip_addr(interface, AF_INET6));
494 * Removing '%' and following characters from IPv6 since the interface identifier is redundant,
495 * as the output already includes the interface name.
497 if (ipv6_address != NULL) {
498 char *prct_ptr = strstr(ipv6_address, "%");
499 if (prct_ptr != NULL) {
504 bool prefer_ipv4 = true;
505 if (ipv4_address == NULL) {
506 if (ipv6_address == NULL) {
507 START_COLOR("color_bad");
508 outwalk += sprintf(outwalk, "%s", format_down);
513 } else if (BEGINS_WITH(ipv4_address, "no IP") && ipv6_address != NULL && !BEGINS_WITH(ipv6_address, "no IP")) {
517 const char *ip_address = (prefer_ipv4) ? ipv4_address : ipv6_address;
518 if (!get_wireless_info(interface, &info)) {
520 START_COLOR("color_bad");
523 if (info.flags & WIRELESS_INFO_FLAG_HAS_QUALITY)
524 START_COLOR((info.quality < info.quality_average ? "color_degraded" : "color_good"));
526 if (BEGINS_WITH(ip_address, "no IP")) {
527 START_COLOR("color_degraded");
529 START_COLOR("color_good");
534 for (; *walk != '\0'; walk++) {
536 *(outwalk++) = *walk;
538 } else if (BEGINS_WITH(walk + 1, "quality")) {
539 if (info.flags & WIRELESS_INFO_FLAG_HAS_QUALITY) {
540 if (info.quality_max)
541 outwalk += sprintf(outwalk, format_quality, PERCENT_VALUE(info.quality, info.quality_max), pct_mark);
543 outwalk += sprintf(outwalk, "%d", info.quality);
547 walk += strlen("quality");
549 } else if (BEGINS_WITH(walk + 1, "signal")) {
550 if (info.flags & WIRELESS_INFO_FLAG_HAS_SIGNAL) {
551 if (info.signal_level_max)
552 outwalk += sprintf(outwalk, "%3d%s", PERCENT_VALUE(info.signal_level, info.signal_level_max), pct_mark);
554 outwalk += sprintf(outwalk, "%d dBm", info.signal_level);
558 walk += strlen("signal");
560 } else if (BEGINS_WITH(walk + 1, "noise")) {
561 if (info.flags & WIRELESS_INFO_FLAG_HAS_NOISE) {
562 if (info.noise_level_max)
563 outwalk += sprintf(outwalk, "%3d%s", PERCENT_VALUE(info.noise_level, info.noise_level_max), pct_mark);
565 outwalk += sprintf(outwalk, "%d dBm", info.noise_level);
569 walk += strlen("noise");
571 } else if (BEGINS_WITH(walk + 1, "essid")) {
572 #ifdef IW_ESSID_MAX_SIZE
573 if (info.flags & WIRELESS_INFO_FLAG_HAS_ESSID)
574 maybe_escape_markup(info.essid, &outwalk);
578 walk += strlen("essid");
580 } else if (BEGINS_WITH(walk + 1, "frequency")) {
581 if (info.flags & WIRELESS_INFO_FLAG_HAS_FREQUENCY)
582 outwalk += sprintf(outwalk, "%1.1f GHz", info.frequency / 1e9);
585 walk += strlen("frequency");
587 } else if (BEGINS_WITH(walk + 1, "ip")) {
588 outwalk += sprintf(outwalk, "%s", ip_address);
589 walk += strlen("ip");
592 else if (BEGINS_WITH(walk + 1, "bitrate")) {
595 print_bitrate(br_buffer, sizeof(br_buffer), info.bitrate);
597 outwalk += sprintf(outwalk, "%s", br_buffer);
598 walk += strlen("bitrate");
610 OUTPUT_FULL_TEXT(buffer);