components/wifi.c
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/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <ifaddrs.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <unistd.h>
#include "../util.h"
#if defined(__linux__)
#include <limits.h>
#include <linux/wireless.h>
const char *
wifi_perc(const char *iface)
{
int i, cur;
int total = 70; /* the max of /proc/net/wireless */
char *p, *datastart;
char path[PATH_MAX];
char status[5];
FILE *fp;
if (esnprintf(path, sizeof(path),
"/sys/class/net/%s/operstate",
iface) < 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, iface))) {
return NULL;
}
datastart = (datastart+(strlen(iface)+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);
return bprintf("%d", (int)((float)cur / total * 100));
}
const char *
wifi_essid(const char *iface)
{
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", iface) < 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 *iface, struct ieee80211_nodereq *nr)
{
struct ieee80211_bssid bssid;
int sockfd;
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, iface, sizeof(bssid.i_name));
if ((ioctl(sockfd, SIOCG80211BSSID, &bssid)) < 0) {
warn("ioctl 'SIOCG80211BSSID':");
close(sockfd);
return 0;
}
strlcpy(nr->nr_ifname, iface, 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 *iface)
{
struct ieee80211_nodereq nr;
int q;
if (load_ieee80211_nodereq(iface, &nr)) {
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)));
}
return bprintf("%d", q);
}
return NULL;
}
const char *
wifi_essid(const char *iface)
{
struct ieee80211_nodereq nr;
if (load_ieee80211_nodereq(iface, &nr)) {
return bprintf("%s", nr.nr_nwid);
}
return NULL;
}
#endif