[hackers] [slstatus][PATCH] wifi component on FreeBSD

---
 Addded suport for showing signal strength and essid on FreeBSD.
 Use the usual ioctl calls to retrieve this information.
 Extracted logic to convert signal strength in (dB) to
 an approx. percentage signal strength into a macro.
 components/wifi.c | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 95 insertions(+), 3 deletions(-)
diff --git a/components/wifi.c b/components/wifi.c
index 8863252..d99c46c 100644
--- a/components/wifi.c
+++ b/components/wifi.c
_AT_@ -8,6 +8,11 @@
 
 #include "../util.h"
 
+#define RSSI_TO_PERC(rssi) \
+			rssi >= -50 ? 100 : \
+			(rssi <= -100 ? 0 : \
+			(2 * (rssi + 100)))
+
 #if defined(__linux__)
 	#include <limits.h>
 	#include <linux/wireless.h>
_AT_@ -150,9 +155,7 @@
 			if (nr.nr_max_rssi) {
 				q = IEEE80211_NODEREQ_RSSI(&nr);
 			} else {
-				q = nr.nr_rssi >= -50 ? 100 :
-				    (nr.nr_rssi <= -100 ? 0 :
-				    (2 * (nr.nr_rssi + 100)));
+				q = RSSI_TO_PERC(nr.nr_rssi);
 			}
 			return bprintf("%d", q);
 		}
_AT_@ -171,4 +174,93 @@
 
 		return NULL;
 	}
+#elif defined(__FreeBSD__)
+	#include <net/if.h>
+	#include <net80211/ieee80211_ioctl.h>
+
+	int
+	load_ieee80211req(int sock, const char *interface, void *data, int type, size_t *len)
+	{
+		char warn_buf[256];
+		struct ieee80211req ireq;
+		memset(&ireq, 0, sizeof(ireq));
+		ireq.i_type = type;
+		ireq.i_data = (caddr_t) data;
+		ireq.i_len = *len;
+
+		strlcpy(ireq.i_name, interface, sizeof(ireq.i_name));
+		if (ioctl(sock, SIOCG80211, &ireq) < 0) {
+			snprintf(warn_buf,  sizeof(warn_buf),
+					"ioctl: 'SIOCG80211': %d", type);
+			warn(warn_buf);
+			return 0;
+		}
+
+		*len = ireq.i_len;
+		return 1;
+	}
+
+	const char *
+	wifi_perc(const char *interface)
+	{
+		union {
+			struct ieee80211req_sta_req sta;
+			uint8_t buf[24 * 1024];
+		} info;
+		uint8_t bssid[IEEE80211_ADDR_LEN];
+		int rssi_dbm;
+		int sockfd;
+		size_t len;
+
+		if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+			warn("socket 'AF_INET':");
+			return 0;
+		}
+
+		/* Retreive MAC address of interface */
+		len = IEEE80211_ADDR_LEN;
+		if (load_ieee80211req(sockfd, interface, &bssid, IEEE80211_IOC_BSSID, &len))
+		{
+			/* Retrieve info on station with above BSSID */
+			memset(&info, 0, sizeof(info));
+			memcpy(info.sta.is_u.macaddr, bssid, sizeof(bssid));
+
+			len = sizeof(info);
+			if (load_ieee80211req(sockfd, interface, &info, IEEE80211_IOC_STA_INFO, &len)) {
+				rssi_dbm = info.sta.info[0].isi_noise +
+ 					         info.sta.info[0].isi_rssi / 2;
+				return bprintf("%d", RSSI_TO_PERC(rssi_dbm));
+			}
+		}
+
+		close(sockfd);
+		return NULL;
+	}
+
+	const char *
+	wifi_essid(const char *interface)
+	{
+		char ssid[IEEE80211_NWID_LEN + 1];
+		size_t len;
+		int sockfd;
+
+		if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+			warn("socket 'AF_INET':");
+			return 0;
+		}
+
+		len = sizeof(ssid);
+		memset(&ssid, 0, len);
+		if (load_ieee80211req(sockfd, interface, &ssid, IEEE80211_IOC_SSID, &len )) {
+			if (len < sizeof(ssid))
+				len += 1;
+			else
+				len = sizeof(ssid);
+
+			ssid[len - 1] = '\0';
+			return bprintf("%s", ssid);
+		}
+
+		return NULL;
+	}
 #endif
-- 
2.7.4