components/wifi.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <ifaddrs.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <sys/ioctl.h>
   6 #include <sys/socket.h>
   7 #include <unistd.h>
   8
   9 #include "../util.h"
  10
  11 #if defined(__linux__)
  12         #include <limits.h>
  13         #include <linux/wireless.h>
  14
  15         const char *
  16         wifi_perc(const char *iface)
  17         {
  18                 int i, cur;
  19                 int total = 70; /* the max of /proc/net/wireless */
  20                 char *p, *datastart;
  21                 char path[PATH_MAX];
  22                 char status[5];
  23                 FILE *fp;
  24
  25                 if (esnprintf(path, sizeof(path),
  26                               "/sys/class/net/%s/operstate",
  27                               iface) < 0) {
  28                         return NULL;
  29                 }
  30                 if (!(fp = fopen(path, "r"))) {
  31                         warn("fopen '%s':", path);
  32                         return NULL;
  33                 }
  34                 p = fgets(status, 5, fp);
  35                 fclose(fp);
  36                 if(!p || strcmp(status, "up\n") != 0) {
  37                         return NULL;
  38                 }
  39
  40                 if (!(fp = fopen("/proc/net/wireless", "r"))) {
  41                         warn("fopen '/proc/net/wireless':");
  42                         return NULL;
  43                 }
  44
  45                 for (i = 0; i < 3; i++) {
  46                         if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
  47                                 break;
  48                 }
  49                 fclose(fp);
  50                 if (i < 2 || !p) {
  51                         return NULL;
  52                 }
  53
  54                 if (!(datastart = strstr(buf, iface))) {
  55                         return NULL;
  56                 }
  57
  58                 datastart = (datastart+(strlen(iface)+1));
  59                 sscanf(datastart + 1, " %*d   %d  %*d  %*d\t\t  %*d\t   "
  60                        "%*d\t\t%*d\t\t %*d\t  %*d\t\t %*d", &cur);
  61
  62                 return bprintf("%d", (int)((float)cur / total * 100));
  63         }
  64
  65         const char *
  66         wifi_essid(const char *iface)
  67         {
  68                 static char id[IW_ESSID_MAX_SIZE+1];
  69                 int sockfd;
  70                 struct iwreq wreq;
  71
  72                 memset(&wreq, 0, sizeof(struct iwreq));
  73                 wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
  74                 if (esnprintf(wreq.ifr_name, sizeof(wreq.ifr_name),
  75                               "%s", iface) < 0) {
  76                         return NULL;
  77                 }
  78
  79                 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
  80                         warn("socket 'AF_INET':");
  81                         return NULL;
  82                 }
  83                 wreq.u.essid.pointer = id;
  84                 if (ioctl(sockfd,SIOCGIWESSID, &wreq) < 0) {
  85                         warn("ioctl 'SIOCGIWESSID':");
  86                         close(sockfd);
  87                         return NULL;
  88                 }
  89
  90                 close(sockfd);
  91
  92                 if (!strcmp(id, "")) {
  93                         return NULL;
  94                 }
  95
  96                 return id;
  97         }
  98 #elif defined(__OpenBSD__)
  99         #include <net/if.h>
 100         #include <net/if_media.h>
 101         #include <net80211/ieee80211.h>
 102         #include <sys/select.h> /* before <sys/ieee80211_ioctl.h> for NBBY */
 103         #include <net80211/ieee80211_ioctl.h>
 104         #include <stdlib.h>
 105         #include <sys/types.h>
 106
 107         static int
 108         load_ieee80211_nodereq(const char *iface, struct ieee80211_nodereq *nr)
 109         {
 110                 struct ieee80211_bssid bssid;
 111                 int sockfd;
 112
 113                 memset(&bssid, 0, sizeof(bssid));
 114                 memset(nr, 0, sizeof(struct ieee80211_nodereq));
 115                 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 116                         warn("socket 'AF_INET':");
 117                         return 0;
 118                 }
 119                 strlcpy(bssid.i_name, iface, sizeof(bssid.i_name));
 120                 if ((ioctl(sockfd, SIOCG80211BSSID, &bssid)) < 0) {
 121                         warn("ioctl 'SIOCG80211BSSID':");
 122                         close(sockfd);
 123                         return 0;
 124                 }
 125                 strlcpy(nr->nr_ifname, iface, sizeof(nr->nr_ifname));
 126                 memcpy(&nr->nr_macaddr, bssid.i_bssid, sizeof(nr->nr_macaddr));
 127                 if ((ioctl(sockfd, SIOCG80211NODE, nr)) < 0 && nr->nr_rssi) {
 128                         warn("ioctl 'SIOCG80211NODE':");
 129                         close(sockfd);
 130                         return 0;
 131                 }
 132
 133                 return close(sockfd), 1;
 134         }
 135
 136         const char *
 137         wifi_perc(const char *iface)
 138         {
 139                 struct ieee80211_nodereq nr;
 140                 int q;
 141
 142                 if (load_ieee80211_nodereq(iface, &nr)) {
 143                         if (nr.nr_max_rssi) {
 144                                 q = IEEE80211_NODEREQ_RSSI(&nr);
 145                         } else {
 146                                 q = nr.nr_rssi >= -50 ? 100 : (nr.nr_rssi <= -100 ? 0 :
 147                                 (2 * (nr.nr_rssi + 100)));
 148                         }
 149                         return bprintf("%d", q);
 150                 }
 151
 152                 return NULL;
 153         }
 154
 155         const char *
 156         wifi_essid(const char *iface)
 157         {
 158                 struct ieee80211_nodereq nr;
 159
 160                 if (load_ieee80211_nodereq(iface, &nr)) {
 161                         return bprintf("%s", nr.nr_nwid);
 162                 }
 163
 164                 return NULL;
 165         }
 166 #endif