slstatus

wifi.c (5962B)

---

 /* See LICENSE file for copyright and license details. */
 #include <ifaddrs.h>
 #include <stdio.h>
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
 #include <unistd.h>
 
 #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>
 
 	const char *
 	wifi_perc(const char *interface)
 	{
 		int cur;
 		size_t i;
 		char *p, *datastart;
 		char path[PATH_MAX];
 		char status[5];
 		FILE *fp;
 
 		if (esnprintf(path, sizeof(path), "/sys/class/net/%s/operstate",
 		              interface) < 0) {
 			return NULL;
 		}
 		if (!(fp = fopen(path, "r"))) {
 			warn("fopen '%s':", path);
 			return NULL;
 		}
 		p = fgets(status, 5, fp);
 		fclose(fp);
 		if (!p || strcmp(status, "up\n") != 0) {
 			return NULL;
 		}
 
 		if (!(fp = fopen("/proc/net/wireless", "r"))) {
 			warn("fopen '/proc/net/wireless':");
 			return NULL;
 		}
 
 		for (i = 0; i < 3; i++) {
 			if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
 				break;
 		}
 		fclose(fp);
 		if (i < 2 || !p) {
 			return NULL;
 		}
 
 		if (!(datastart = strstr(buf, interface))) {
 			return NULL;
 		}
 
 		datastart = (datastart+(strlen(interface)+1));
 		sscanf(datastart + 1, " %*d   %d  %*d  %*d\t\t  %*d\t   "
 		       "%*d\t\t%*d\t\t %*d\t  %*d\t\t %*d", &cur);
 
 		/* 70 is the max of /proc/net/wireless */
 		return bprintf("%d", (int)((float)cur / 70 * 100));
 	}
 
 	const char *
 	wifi_essid(const char *interface)
 	{
 		static char id[IW_ESSID_MAX_SIZE+1];
 		int sockfd;
 		struct iwreq wreq;
 
 		memset(&wreq, 0, sizeof(struct iwreq));
 		wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
 		if (esnprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s",
 		              interface) < 0) {
 			return NULL;
 		}
 
 		if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 			warn("socket 'AF_INET':");
 			return NULL;
 		}
 		wreq.u.essid.pointer = id;
 		if (ioctl(sockfd,SIOCGIWESSID, &wreq) < 0) {
 			warn("ioctl 'SIOCGIWESSID':");
 			close(sockfd);
 			return NULL;
 		}
 
 		close(sockfd);
 
 		if (!strcmp(id, "")) {
 			return NULL;
 		}
 
 		return id;
 	}
 #elif defined(__OpenBSD__)
 	#include <net/if.h>
 	#include <net/if_media.h>
 	#include <net80211/ieee80211.h>
 	#include <sys/select.h> /* before <sys/ieee80211_ioctl.h> for NBBY */
 	#include <net80211/ieee80211_ioctl.h>
 	#include <stdlib.h>
 	#include <sys/types.h>
 
 	static int
 	load_ieee80211_nodereq(const char *interface, struct ieee80211_nodereq *nr)
 	{
 		struct ieee80211_bssid bssid;
 		int sockfd;
 		uint8_t zero_bssid[IEEE80211_ADDR_LEN];
 
 		memset(&bssid, 0, sizeof(bssid));
 		memset(nr, 0, sizeof(struct ieee80211_nodereq));
 		if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 			warn("socket 'AF_INET':");
 			return 0;
 		}
 		strlcpy(bssid.i_name, interface, sizeof(bssid.i_name));
 		if ((ioctl(sockfd, SIOCG80211BSSID, &bssid)) < 0) {
 			warn("ioctl 'SIOCG80211BSSID':");
 			close(sockfd);
 			return 0;
 		}
 		memset(&zero_bssid, 0, sizeof(zero_bssid));
 		if (memcmp(bssid.i_bssid, zero_bssid,
 		    IEEE80211_ADDR_LEN) == 0) {
 			close(sockfd);
 			return 0;
 		}
 		strlcpy(nr->nr_ifname, interface, sizeof(nr->nr_ifname));
 		memcpy(&nr->nr_macaddr, bssid.i_bssid, sizeof(nr->nr_macaddr));
 		if ((ioctl(sockfd, SIOCG80211NODE, nr)) < 0 && nr->nr_rssi) {
 			warn("ioctl 'SIOCG80211NODE':");
 			close(sockfd);
 			return 0;
 		}
 
 		return close(sockfd), 1;
 	}
 
 	const char *
 	wifi_perc(const char *interface)
 	{
 		struct ieee80211_nodereq nr;
 		int q;
 
 		if (load_ieee80211_nodereq(interface, &nr)) {
 			if (nr.nr_max_rssi) {
 				q = IEEE80211_NODEREQ_RSSI(&nr);
 			} else {
 				q = RSSI_TO_PERC(nr.nr_rssi);
 			}
 			return bprintf("%d", q);
 		}
 
 		return NULL;
 	}
 
 	const char *
 	wifi_essid(const char *interface)
 	{
 		struct ieee80211_nodereq nr;
 
 		if (load_ieee80211_nodereq(interface, &nr)) {
 			return bprintf("%s", nr.nr_nwid);
 		}
 
 		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;
 		const char *fmt;
 
 		if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 			warn("socket 'AF_INET':");
 			return NULL;
 		}
 
 		/* Retreive MAC address of interface */
 		len = IEEE80211_ADDR_LEN;
 		fmt = NULL;
 		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;
 
 				fmt = bprintf("%d", RSSI_TO_PERC(rssi_dbm));
 			}
 		}
 
 		close(sockfd);
 		return fmt;
 	}
 
 	const char *
 	wifi_essid(const char *interface)
 	{
 		char ssid[IEEE80211_NWID_LEN + 1];
 		size_t len;
 		int sockfd;
 		const char *fmt;
 
 		if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 			warn("socket 'AF_INET':");
 			return NULL;
 		}
 
 		fmt = NULL;
 		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';
 			fmt = bprintf("%s", ssid);
 		}
 
 		close(sockfd);
 		return fmt;
 	}
 #endif