components/wifi.c

   1 /* See LICENSE file for copyright and license details. */
   2 #if defined(__linux__)
   3 #include <err.h>
   4 #include <ifaddrs.h>
   5 #include <linux/wireless.h>
   6 #include <sys/socket.h>
   7 #include <stdio.h>
   8 #include <limits.h>
   9 #include <string.h>
  10 #include <sys/ioctl.h>
  11 #include <unistd.h>
  12
  13 #include "../util.h"
  14
  15 const char *
  16 wifi_perc(const char *iface)
  17 {
  18         int i, cur;
  19         float perc;
  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, "/operstate");
  27         fp = fopen(path, "r");
  28         if (fp == NULL) {
  29                 warn("Failed to open file %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         fp = fopen("/proc/net/wireless", "r");
  39         if (fp == NULL) {
  40                 warn("Failed to open file /proc/net/wireless");
  41                 return NULL;
  42         }
  43
  44         for (i = 0; i < 3; i++) {
  45                 if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
  46                         break;
  47         }
  48         fclose(fp);
  49         if (i < 2 || !p)
  50                 return NULL;
  51
  52         if ((datastart = strstr(buf, iface)) == NULL)
  53                 return NULL;
  54
  55         datastart = (datastart+(strlen(iface)+1));
  56         sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &cur);
  57
  58         perc = (float)cur / total * 100.0;
  59
  60         return bprintf("%.0f", perc);
  61 }
  62
  63 const char *
  64 wifi_essid(const char *iface)
  65 {
  66         static char id[IW_ESSID_MAX_SIZE+1];
  67         int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
  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 == -1) {
  75                 warn("Failed to get ESSID for interface %s", iface);
  76                 return NULL;
  77         }
  78         wreq.u.essid.pointer = id;
  79         if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
  80                 warn("Failed to get ESSID for interface %s", iface);
  81                 close(sockfd);
  82                 return NULL;
  83         }
  84
  85         close(sockfd);
  86
  87         if (strcmp(id, "") == 0)
  88                 return NULL;
  89         else
  90                 return id;
  91 }
  92 #endif