components/wifi.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <ifaddrs.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <sys/ioctl.h>
   6 #include <sys/socket.h>
   7 #include <unistd.h>
   8
   9 #include "../util.h"
  10
  11 #if defined(__linux__)
  12         #include <limits.h>
  13         #include <linux/wireless.h>
  14
  15         const char *
  16         wifi_perc(const char *interface)
  17         {
  18                 int cur;
  19                 size_t i;
  20                 char *p, *datastart;
  21                 char path[PATH_MAX];
  22                 char status[5];
  23                 FILE *fp;
  24
  25                 if (esnprintf(path, sizeof(path),
  26                               "/sys/class/net/%s/operstate",
  27                               interface) < 0) {
  28                         return NULL;
  29                 }
  30                 if (!(fp = fopen(path, "r"))) {
  31                         warn("fopen '%s':", path);
  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                 if (!(fp = fopen("/proc/net/wireless", "r"))) {
  41                         warn("fopen '/proc/net/wireless':");
  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
  54                 if (!(datastart = strstr(buf, interface))) {
  55                         return NULL;
  56                 }
  57
  58                 datastart = (datastart+(strlen(interface)+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                 /* 70 is the max of /proc/net/wireless */
  63                 return bprintf("%d", (int)((float)cur / 70 * 100));
  64         }
  65
  66         const char *
  67         wifi_essid(const char *interface)
  68         {
  69                 static char id[IW_ESSID_MAX_SIZE+1];
  70                 int sockfd;
  71                 struct iwreq wreq;
  72
  73                 memset(&wreq, 0, sizeof(struct iwreq));
  74                 wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
  75                 if (esnprintf(wreq.ifr_name, sizeof(wreq.ifr_name),
  76                               "%s", interface) < 0) {
  77                         return NULL;
  78                 }
  79
  80                 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
  81                         warn("socket 'AF_INET':");
  82                         return NULL;
  83                 }
  84                 wreq.u.essid.pointer = id;
  85                 if (ioctl(sockfd,SIOCGIWESSID, &wreq) < 0) {
  86                         warn("ioctl 'SIOCGIWESSID':");
  87                         close(sockfd);
  88                         return NULL;
  89                 }
  90
  91                 close(sockfd);
  92
  93                 if (!strcmp(id, "")) {
  94                         return NULL;
  95                 }
  96
  97                 return id;
  98         }
  99 #elif defined(__OpenBSD__)
 100         #include <net/if.h>
 101         #include <net/if_media.h>
 102         #include <net80211/ieee80211.h>
 103         #include <sys/select.h> /* before <sys/ieee80211_ioctl.h> for NBBY */
 104         #include <net80211/ieee80211_ioctl.h>
 105         #include <stdlib.h>
 106         #include <sys/types.h>
 107
 108         static int
 109         load_ieee80211_nodereq(const char *interface, struct ieee80211_nodereq *nr)
 110         {
 111                 struct ieee80211_bssid bssid;
 112                 int sockfd;
 113                 uint8_t zero_bssid[IEEE80211_ADDR_LEN];
 114
 115                 memset(&bssid, 0, sizeof(bssid));
 116                 memset(nr, 0, sizeof(struct ieee80211_nodereq));
 117                 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 118                         warn("socket 'AF_INET':");
 119                         return 0;
 120                 }
 121                 strlcpy(bssid.i_name, interface, sizeof(bssid.i_name));
 122                 if ((ioctl(sockfd, SIOCG80211BSSID, &bssid)) < 0) {
 123                         warn("ioctl 'SIOCG80211BSSID':");
 124                         close(sockfd);
 125                         return 0;
 126                 }
 127                 memset(&zero_bssid, 0, sizeof(zero_bssid));
 128                 if (memcmp(bssid.i_bssid, zero_bssid,
 129                     IEEE80211_ADDR_LEN) == 0) {
 130                         close(sockfd);
 131                         return 0;
 132                 }
 133                 strlcpy(nr->nr_ifname, interface, sizeof(nr->nr_ifname));
 134                 memcpy(&nr->nr_macaddr, bssid.i_bssid, sizeof(nr->nr_macaddr));
 135                 if ((ioctl(sockfd, SIOCG80211NODE, nr)) < 0 && nr->nr_rssi) {
 136                         warn("ioctl 'SIOCG80211NODE':");
 137                         close(sockfd);
 138                         return 0;
 139                 }
 140
 141                 return close(sockfd), 1;
 142         }
 143
 144         const char *
 145         wifi_perc(const char *interface)
 146         {
 147                 struct ieee80211_nodereq nr;
 148                 int q;
 149
 150                 if (load_ieee80211_nodereq(interface, &nr)) {
 151                         if (nr.nr_max_rssi) {
 152                                 q = IEEE80211_NODEREQ_RSSI(&nr);
 153                         } else {
 154                                 q = nr.nr_rssi >= -50 ? 100 : (nr.nr_rssi <= -100 ? 0 :
 155                                 (2 * (nr.nr_rssi + 100)));
 156                         }
 157                         return bprintf("%d", q);
 158                 }
 159
 160                 return NULL;
 161         }
 162
 163         const char *
 164         wifi_essid(const char *interface)
 165         {
 166                 struct ieee80211_nodereq nr;
 167
 168                 if (load_ieee80211_nodereq(interface, &nr)) {
 169                         return bprintf("%s", nr.nr_nwid);
 170                 }
 171
 172                 return NULL;
 173         }
 174 #endif