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                 if (esnprintf(path, sizeof(path),
  27                               "/sys/class/net/%s/operstate",
  28                               iface) < 0) {
  29                         return NULL;
  30                 }
  31                 if (!(fp = fopen(path, "r"))) {
  32                         warn("fopen '%s':", path);
  33                         return NULL;
  34                 }
  35                 p = fgets(status, 5, fp);
  36                 fclose(fp);
  37                 if(!p || strcmp(status, "up\n") != 0) {
  38                         return NULL;
  39                 }
  40
  41                 if (!(fp = fopen("/proc/net/wireless", "r"))) {
  42                         warn("fopen '/proc/net/wireless':");
  43                         return NULL;
  44                 }
  45
  46                 for (i = 0; i < 3; i++) {
  47                         if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
  48                                 break;
  49                 }
  50                 fclose(fp);
  51                 if (i < 2 || !p) {
  52                         return NULL;
  53                 }
  54
  55                 if (!(datastart = strstr(buf, iface))) {
  56                         return NULL;
  57                 }
  58
  59                 datastart = (datastart+(strlen(iface)+1));
  60                 sscanf(datastart + 1, " %*d   %d  %*d  %*d\t\t  %*d\t   "
  61                        "%*d\t\t%*d\t\t %*d\t  %*d\t\t %*d", &cur);
  62
  63                 return bprintf("%d%%", (int)((float)cur / total * 100));
  64         }
  65
  66         const char *
  67         wifi_essid(const char *iface)
  68         {
  69                 static char id[IW_ESSID_MAX_SIZE+1];
  70                 int sockfd;
  71                 struct iwreq wreq;
  72
  73                 memset(&wreq, 0, sizeof(struct iwreq));
  74                 wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
  75                 if (esnprintf(wreq.ifr_name, sizeof(wreq.ifr_name),
  76                               "%s", iface) < 0) {
  77                         return NULL;
  78                 }
  79
  80                 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
  81                         warn("socket 'AF_INET':");
  82                         return NULL;
  83                 }
  84                 wreq.u.essid.pointer = id;
  85                 if (ioctl(sockfd,SIOCGIWESSID, &wreq) < 0) {
  86                         warn("ioctl 'SIOCGIWESSID':");
  87                         close(sockfd);
  88                         return NULL;
  89                 }
  90
  91                 close(sockfd);
  92
  93                 if (!strcmp(id, "")) {
  94                         return NULL;
  95                 }
  96
  97                 return id;
  98         }
  99 #elif defined(__OpenBSD__)
 100         #include <net/if.h>
 101         #include <net/if_media.h>
 102         #include <net80211/ieee80211.h>
 103         #include <sys/select.h> /* before <sys/ieee80211_ioctl.h> for NBBY */
 104         #include <net80211/ieee80211_ioctl.h>
 105         #include <stdlib.h>
 106         #include <sys/types.h>
 107
 108         static int
 109         load_ieee80211_nodereq(const char *iface, struct ieee80211_nodereq *nr)
 110         {
 111                 struct ieee80211_bssid bssid;
 112                 int sockfd;
 113
 114                 memset(&bssid, 0, sizeof(bssid));
 115                 memset(nr, 0, sizeof(struct ieee80211_nodereq));
 116                 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 117                         warn("socket 'AF_INET':");
 118                         return 0;
 119                 }
 120                 strlcpy(bssid.i_name, iface, sizeof(bssid.i_name));
 121                 if ((ioctl(sockfd, SIOCG80211BSSID, &bssid)) < 0) {
 122                         warn("ioctl 'SIOCG80211BSSID':");
 123                         close(sockfd);
 124                         return 0;
 125                 }
 126                 strlcpy(nr->nr_ifname, iface, sizeof(nr->nr_ifname));
 127                 memcpy(&nr->nr_macaddr, bssid.i_bssid, sizeof(nr->nr_macaddr));
 128                 if ((ioctl(sockfd, SIOCG80211NODE, nr)) < 0 && nr->nr_rssi) {
 129                         warn("ioctl 'SIOCG80211NODE':");
 130                         close(sockfd);
 131                         return 0;
 132                 }
 133
 134                 return close(sockfd), 1;
 135         }
 136
 137         const char *
 138         wifi_perc(const char *iface)
 139         {
 140                 struct ieee80211_nodereq nr;
 141                 int q;
 142
 143                 if (load_ieee80211_nodereq(iface, &nr)) {
 144                         if (nr.nr_max_rssi) {
 145                                 q = IEEE80211_NODEREQ_RSSI(&nr);
 146                         } else {
 147                                 q = nr.nr_rssi >= -50 ? 100 : (nr.nr_rssi <= -100 ? 0 :
 148                                 (2 * (nr.nr_rssi + 100)));
 149                         }
 150                         return bprintf("%d%%", q);
 151                 }
 152
 153                 return NULL;
 154         }
 155
 156         const char *
 157         wifi_essid(const char *iface)
 158         {
 159                 struct ieee80211_nodereq nr;
 160
 161                 if (load_ieee80211_nodereq(iface, &nr)) {
 162                         return bprintf("%s", nr.nr_nwid);
 163                 }
 164
 165                 return NULL;
 166         }
 167 #endif