components/wifi.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <errno.h>
   3 #include <ifaddrs.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <sys/ioctl.h>
   7 #include <sys/socket.h>
   8 #include <unistd.h>
   9
  10 #include "../util.h"
  11
  12 #if defined(__linux__)
  13         #include <limits.h>
  14         #include <linux/wireless.h>
  15
  16         const char *
  17         wifi_perc(const char *iface)
  18         {
  19                 int i, cur;
  20                 int total = 70; /* the max of /proc/net/wireless */
  21                 char *p, *datastart;
  22                 char path[PATH_MAX];
  23                 char status[5];
  24                 FILE *fp;
  25
  26                 snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface,
  27                          "/operstate");
  28                 if (!(fp = fopen(path, "r"))) {
  29                         warn("fopen '%s':", path);
  30                         return NULL;
  31                 }
  32                 p = fgets(status, 5, fp);
  33                 fclose(fp);
  34                 if(!p || strcmp(status, "up\n") != 0) {
  35                         return NULL;
  36                 }
  37
  38                 if (!(fp = fopen("/proc/net/wireless", "r"))) {
  39                         warn("fopen '/proc/net/wireless':");
  40                         return NULL;
  41                 }
  42
  43                 for (i = 0; i < 3; i++) {
  44                         if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
  45                                 break;
  46                 }
  47                 fclose(fp);
  48                 if (i < 2 || !p) {
  49                         return NULL;
  50                 }
  51
  52                 if (!(datastart = strstr(buf, iface))) {
  53                         return NULL;
  54                 }
  55
  56                 datastart = (datastart+(strlen(iface)+1));
  57                 sscanf(datastart + 1, " %*d   %d  %*d  %*d\t\t  %*d\t   "
  58                        "%*d\t\t%*d\t\t %*d\t  %*d\t\t %*d", &cur);
  59
  60                 return bprintf("%d", (int)((float)cur / total * 100));
  61         }
  62
  63         const char *
  64         wifi_essid(const char *iface)
  65         {
  66                 static char id[IW_ESSID_MAX_SIZE+1];
  67                 int sockfd;
  68                 struct iwreq wreq;
  69
  70                 memset(&wreq, 0, sizeof(struct iwreq));
  71                 wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
  72                 snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
  73
  74                 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
  75                         warn("socket 'AF_INET':");
  76                         return NULL;
  77                 }
  78                 wreq.u.essid.pointer = id;
  79                 if (ioctl(sockfd,SIOCGIWESSID, &wreq) < 0) {
  80                         warn("ioctl 'SIOCGIWESSID':");
  81                         close(sockfd);
  82                         return NULL;
  83                 }
  84
  85                 close(sockfd);
  86
  87                 if (!strcmp(id, "")) {
  88                         return NULL;
  89                 }
  90
  91                 return id;
  92         }
  93 #elif defined(__OpenBSD__)
  94         #include <net/if.h>
  95         #include <net/if_media.h>
  96         #include <net80211/ieee80211.h>
  97         #include <sys/select.h> /* before <sys/ieee80211_ioctl.h> for NBBY */
  98         #include <net80211/ieee80211_ioctl.h>
  99         #include <stdlib.h>
 100         #include <sys/types.h>
 101
 102         static int
 103         load_ieee80211_nodereq(const char *iface, struct ieee80211_nodereq *nr)
 104         {
 105                 struct ieee80211_bssid bssid;
 106                 int sockfd;
 107
 108                 memset(&bssid, 0, sizeof(bssid));
 109                 memset(nr, 0, sizeof(struct ieee80211_nodereq));
 110                 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 111                         warn("socket 'AF_INET':");
 112                         return 0;
 113                 }
 114                 strlcpy(bssid.i_name, iface, sizeof(bssid.i_name));
 115                 if ((ioctl(sockfd, SIOCG80211BSSID, &bssid)) < 0) {
 116                         warn("ioctl 'SIOCG80211BSSID':");
 117                         close(sockfd);
 118                         return 0;
 119                 }
 120                 strlcpy(nr->nr_ifname, iface, sizeof(nr->nr_ifname));
 121                 memcpy(&nr->nr_macaddr, bssid.i_bssid, sizeof(nr->nr_macaddr));
 122                 if ((ioctl(sockfd, SIOCG80211NODE, nr)) < 0 && nr->nr_rssi) {
 123                         warn("ioctl 'SIOCG80211NODE':");
 124                         close(sockfd);
 125                         return 0;
 126                 }
 127
 128                 return close(sockfd), 1;
 129         }
 130
 131         const char *
 132         wifi_perc(const char *iface)
 133         {
 134                 struct ieee80211_nodereq nr;
 135                 int q;
 136
 137                 if (load_ieee80211_nodereq(iface, &nr)) {
 138                         if (nr.nr_max_rssi) {
 139                                 q = IEEE80211_NODEREQ_RSSI(&nr);
 140                         } else {
 141                                 q = nr.nr_rssi >= -50 ? 100 : (nr.nr_rssi <= -100 ? 0 :
 142                                 (2 * (nr.nr_rssi + 100)));
 143                         }
 144                         return bprintf("%d", q);
 145                 }
 146
 147                 return NULL;
 148         }
 149
 150         const char *
 151         wifi_essid(const char *iface)
 152         {
 153                 struct ieee80211_nodereq nr;
 154
 155                 if (load_ieee80211_nodereq(iface, &nr)) {
 156                         return bprintf("%s", nr.nr_nwid);
 157                 }
 158
 159                 return NULL;
 160         }
 161 #endif