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, perc;
  18         char *p, *datastart;
  19         char path[PATH_MAX];
  20         char status[5];
  21         FILE *fp;
  22
  23         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate");
  24         fp = fopen(path, "r");
  25         if (fp == NULL) {
  26                 warn("Failed to open file %s", path);
  27                 return NULL;
  28         }
  29         p = fgets(status, 5, fp);
  30         fclose(fp);
  31         if(!p || strcmp(status, "up\n") != 0) {
  32                 return NULL;
  33         }
  34
  35         fp = fopen("/proc/net/wireless", "r");
  36         if (fp == NULL) {
  37                 warn("Failed to open file /proc/net/wireless");
  38                 return NULL;
  39         }
  40
  41         for (i = 0; i < 3; i++) {
  42                 if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
  43                         break;
  44         }
  45         fclose(fp);
  46         if (i < 2 || !p)
  47                 return NULL;
  48
  49         if ((datastart = strstr(buf, iface)) == NULL)
  50                 return NULL;
  51
  52         datastart = (datastart+(strlen(iface)+1));
  53         sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &perc);
  54
  55         return bprintf("%d", perc);
  56 }
  57
  58 const char *
  59 wifi_essid(const char *iface)
  60 {
  61         static char id[IW_ESSID_MAX_SIZE+1];
  62         int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
  63         struct iwreq wreq;
  64
  65         memset(&wreq, 0, sizeof(struct iwreq));
  66         wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
  67         snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
  68
  69         if (sockfd == -1) {
  70                 warn("Failed to get ESSID for interface %s", iface);
  71                 return NULL;
  72         }
  73         wreq.u.essid.pointer = id;
  74         if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
  75                 warn("Failed to get ESSID for interface %s", iface);
  76                 return NULL;
  77         }
  78
  79         close(sockfd);
  80
  81         if (strcmp(id, "") == 0)
  82                 return NULL;
  83         else
  84                 return id;
  85 }