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                 if (!(fp = fopen(path, "r"))) {
  29                         fprintf(stderr, "fopen '%s': %s\n", path,
  30                                 strerror(errno));
  31                         return NULL;
  32                 }
  33                 p = fgets(status, 5, fp);
  34                 fclose(fp);
  35                 if(!p || strcmp(status, "up\n") != 0) {
  36                         return NULL;
  37                 }
  38
  39                 if (!(fp = fopen("/proc/net/wireless", "r"))) {
  40                         fprintf(stderr, "fopen '/proc/net/wireless': %s\n",
  41                                 strerror(errno));
  42                         return NULL;
  43                 }
  44
  45                 for (i = 0; i < 3; i++) {
  46                         if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
  47                                 break;
  48                 }
  49                 fclose(fp);
  50                 if (i < 2 || !p)
  51                         return NULL;
  52
  53                 if ((datastart = strstr(buf, iface)) == NULL)
  54                         return NULL;
  55
  56                 datastart = (datastart+(strlen(iface)+1));
  57                 sscanf(datastart + 1, " %*d   %d  %*d  %*d\t\t  %*d\t   "
  58                        "%*d\t\t%*d\t\t %*d\t  %*d\t\t %*d", &cur);
  59
  60                 perc = (float)cur / total * 100.0;
  61
  62                 return bprintf("%.0f", perc);
  63         }
  64
  65         const char *
  66         wifi_essid(const char *iface)
  67         {
  68                 static char id[IW_ESSID_MAX_SIZE+1];
  69                 int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
  70                 struct iwreq wreq;
  71
  72                 memset(&wreq, 0, sizeof(struct iwreq));
  73                 wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
  74                 snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
  75
  76                 if (sockfd == -1) {
  77                         fprintf(stderr, "socket 'AF_INET': %s\n",
  78                                 strerror(errno));
  79                         return NULL;
  80                 }
  81                 wreq.u.essid.pointer = id;
  82                 if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
  83                         fprintf(stderr, "ioctl 'SIOCGIWESSID': %s\n",
  84                                 strerror(errno));
  85                         close(sockfd);
  86                         return NULL;
  87                 }
  88
  89                 close(sockfd);
  90
  91                 if (strcmp(id, "") == 0)
  92                         return NULL;
  93
  94                 return id;
  95         }
  96 #elif defined(__OpenBSD__)
  97         /* unimplemented */
  98 #endif