components/wifi.c

   1 /* See LICENSE file for copyright and license details. */
   2 #if defined(__linux__)
   3         #include <errno.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,
  27                          "/operstate");
  28                 fp = fopen(path, "r");
  29                 if (fp == NULL) {
  30                         fprintf(stderr, "fopen '%s': %s\n", path,
  31                                 strerror(errno));
  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                 fp = fopen("/proc/net/wireless", "r");
  41                 if (fp == NULL) {
  42                         fprintf(stderr, "fopen '/proc/net/wireless': %s\n",
  43                                 strerror(errno));
  44                         return NULL;
  45                 }
  46
  47                 for (i = 0; i < 3; i++) {
  48                         if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
  49                                 break;
  50                 }
  51                 fclose(fp);
  52                 if (i < 2 || !p)
  53                         return NULL;
  54
  55                 if ((datastart = strstr(buf, iface)) == NULL)
  56                         return NULL;
  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                 perc = (float)cur / total * 100.0;
  63
  64                 return bprintf("%.0f", perc);
  65         }
  66
  67         const char *
  68         wifi_essid(const char *iface)
  69         {
  70                 static char id[IW_ESSID_MAX_SIZE+1];
  71                 int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
  72                 struct iwreq wreq;
  73
  74                 memset(&wreq, 0, sizeof(struct iwreq));
  75                 wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
  76                 snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
  77
  78                 if (sockfd == -1) {
  79                         fprintf(stderr, "socket 'AF_INET': %s\n",
  80                                 strerror(errno));
  81                         return NULL;
  82                 }
  83                 wreq.u.essid.pointer = id;
  84                 if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
  85                         fprintf(stderr, "ioctl 'SIOCGIWESSID': %s\n",
  86                                 strerror(errno));
  87                         close(sockfd);
  88                         return NULL;
  89                 }
  90
  91                 close(sockfd);
  92
  93                 if (strcmp(id, "") == 0)
  94                         return NULL;
  95                 else
  96                         return id;
  97         }
  98 #elif defined(__OpenBSD__)
  99         /* unimplemented */
 100 #endif