components/wifi.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <err.h>
   3 #include <ifaddrs.h>
   4 #include <linux/wireless.h>
   5 #include <sys/socket.h>
   6 #include <stdio.h>
   7 #include <limits.h>
   8 #include <string.h>
   9 #include <sys/ioctl.h>
  10 #include <unistd.h>
  11
  12 #include "../util.h"
  13
  14 const char *
  15 wifi_perc(const char *iface)
  16 {
  17         int i, cur;
  18         float perc;
  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         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate");
  26         fp = fopen(path, "r");
  27         if (fp == NULL) {
  28                 warn("Failed to open file %s", path);
  29                 return NULL;
  30         }
  31         p = fgets(status, 5, fp);
  32         fclose(fp);
  33         if(!p || strcmp(status, "up\n") != 0) {
  34                 return NULL;
  35         }
  36
  37         fp = fopen("/proc/net/wireless", "r");
  38         if (fp == NULL) {
  39                 warn("Failed to open file /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         if ((datastart = strstr(buf, iface)) == NULL)
  52                 return NULL;
  53
  54         datastart = (datastart+(strlen(iface)+1));
  55         sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &cur);
  56
  57         perc = (float)cur / total * 100.0;
  58
  59         return bprintf("%.0f", perc);
  60 }
  61
  62 const char *
  63 wifi_essid(const char *iface)
  64 {
  65         static char id[IW_ESSID_MAX_SIZE+1];
  66         int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
  67         struct iwreq wreq;
  68
  69         memset(&wreq, 0, sizeof(struct iwreq));
  70         wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
  71         snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
  72
  73         if (sockfd == -1) {
  74                 warn("Failed to get ESSID for interface %s", iface);
  75                 return NULL;
  76         }
  77         wreq.u.essid.pointer = id;
  78         if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
  79                 warn("Failed to get ESSID for interface %s", iface);
  80                 close(sockfd);
  81                 return NULL;
  82         }
  83
  84         close(sockfd);
  85
  86         if (strcmp(id, "") == 0)
  87                 return NULL;
  88         else
  89                 return id;
  90 }