wifi.c

   1 #include <err.h>
   2 #include <ifaddrs.h>
   3 #include <linux/wireless.h>
   4 #include <sys/socket.h>
   5 #include <stdio.h>
   6 #include <limits.h>
   7 #include <string.h>
   8 #include <sys/ioctl.h>
   9 #include <unistd.h>
  10
  11 #include "util.h"
  12
  13 const char *
  14 wifi_perc(const char *iface)
  15 {
  16         int i, perc;
  17         char *p, *datastart;
  18         char path[PATH_MAX];
  19         char status[5];
  20         FILE *fp;
  21
  22         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface, "/operstate");
  23         fp = fopen(path, "r");
  24         if (fp == NULL) {
  25                 warn("Failed to open file %s", path);
  26                 return NULL;
  27         }
  28         p = fgets(status, 5, fp);
  29         fclose(fp);
  30         if(!p || strcmp(status, "up\n") != 0) {
  31                 return NULL;
  32         }
  33
  34         fp = fopen("/proc/net/wireless", "r");
  35         if (fp == NULL) {
  36                 warn("Failed to open file /proc/net/wireless");
  37                 return NULL;
  38         }
  39
  40         for (i = 0; i < 3; i++) {
  41                 if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
  42                         break;
  43         }
  44         fclose(fp);
  45         if (i < 2 || !p)
  46                 return NULL;
  47
  48         if ((datastart = strstr(buf, iface)) == NULL)
  49                 return NULL;
  50
  51         datastart = (datastart+(strlen(iface)+1));
  52         sscanf(datastart + 1, " %*d   %d  %*d  %*d                %*d      %*d          %*d              %*d      %*d            %*d", &perc);
  53
  54         return bprintf("%d", perc);
  55 }
  56
  57 const char *
  58 wifi_essid(const char *iface)
  59 {
  60         static char id[IW_ESSID_MAX_SIZE+1];
  61         int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
  62         struct iwreq wreq;
  63
  64         memset(&wreq, 0, sizeof(struct iwreq));
  65         wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
  66         snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
  67
  68         if (sockfd == -1) {
  69                 warn("Failed to get ESSID for interface %s", iface);
  70                 return NULL;
  71         }
  72         wreq.u.essid.pointer = id;
  73         if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
  74                 warn("Failed to get ESSID for interface %s", iface);
  75                 return NULL;
  76         }
  77
  78         close(sockfd);
  79
  80         if (strcmp(id, "") == 0)
  81                 return NULL;
  82         else
  83                 return id;
  84 }