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), "/sys/class/net/%s/operstate",
  26                               interface) < 0) {
  27                         return NULL;
  28                 }
  29                 if (!(fp = fopen(path, "r"))) {
  30                         warn("fopen '%s':", path);
  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                         warn("fopen '/proc/net/wireless':");
  41                         return NULL;
  42                 }
  43
  44                 for (i = 0; i < 3; i++) {
  45                         if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
  46                                 break;
  47                 }
  48                 fclose(fp);
  49                 if (i < 2 || !p) {
  50                         return NULL;
  51                 }
  52
  53                 if (!(datastart = strstr(buf, interface))) {
  54                         return NULL;
  55                 }
  56
  57                 datastart = (datastart+(strlen(interface)+1));
  58                 sscanf(datastart + 1, " %*d   %d  %*d  %*d\t\t  %*d\t   "
  59                        "%*d\t\t%*d\t\t %*d\t  %*d\t\t %*d", &cur);
  60
  61                 /* 70 is the max of /proc/net/wireless */
  62                 return bprintf("%d", (int)((float)cur / 70 * 100));
  63         }
  64
  65         const char *
  66         wifi_essid(const char *interface)
  67         {
  68                 static char id[IW_ESSID_MAX_SIZE+1];
  69                 int sockfd;
  70                 struct iwreq wreq;
  71
  72                 memset(&wreq, 0, sizeof(struct iwreq));
  73                 wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
  74                 if (esnprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s",
  75                               interface) < 0) {
  76                         return NULL;
  77                 }
  78
  79                 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
  80                         warn("socket 'AF_INET':");
  81                         return NULL;
  82                 }
  83                 wreq.u.essid.pointer = id;
  84                 if (ioctl(sockfd,SIOCGIWESSID, &wreq) < 0) {
  85                         warn("ioctl 'SIOCGIWESSID':");
  86                         close(sockfd);
  87                         return NULL;
  88                 }
  89
  90                 close(sockfd);
  91
  92                 if (!strcmp(id, "")) {
  93                         return NULL;
  94                 }
  95
  96                 return id;
  97         }
  98 #elif defined(__OpenBSD__)
  99         #include <net/if.h>
 100         #include <net/if_media.h>
 101         #include <net80211/ieee80211.h>
 102         #include <sys/select.h> /* before <sys/ieee80211_ioctl.h> for NBBY */
 103         #include <net80211/ieee80211_ioctl.h>
 104         #include <stdlib.h>
 105         #include <sys/types.h>
 106
 107         static int
 108         load_ieee80211_nodereq(const char *interface, struct ieee80211_nodereq *nr)
 109         {
 110                 struct ieee80211_bssid bssid;
 111                 int sockfd;
 112                 uint8_t zero_bssid[IEEE80211_ADDR_LEN];
 113
 114                 memset(&bssid, 0, sizeof(bssid));
 115                 memset(nr, 0, sizeof(struct ieee80211_nodereq));
 116                 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 117                         warn("socket 'AF_INET':");
 118                         return 0;
 119                 }
 120                 strlcpy(bssid.i_name, interface, sizeof(bssid.i_name));
 121                 if ((ioctl(sockfd, SIOCG80211BSSID, &bssid)) < 0) {
 122                         warn("ioctl 'SIOCG80211BSSID':");
 123                         close(sockfd);
 124                         return 0;
 125                 }
 126                 memset(&zero_bssid, 0, sizeof(zero_bssid));
 127                 if (memcmp(bssid.i_bssid, zero_bssid,
 128                     IEEE80211_ADDR_LEN) == 0) {
 129                         close(sockfd);
 130                         return 0;
 131                 }
 132                 strlcpy(nr->nr_ifname, interface, sizeof(nr->nr_ifname));
 133                 memcpy(&nr->nr_macaddr, bssid.i_bssid, sizeof(nr->nr_macaddr));
 134                 if ((ioctl(sockfd, SIOCG80211NODE, nr)) < 0 && nr->nr_rssi) {
 135                         warn("ioctl 'SIOCG80211NODE':");
 136                         close(sockfd);
 137                         return 0;
 138                 }
 139
 140                 return close(sockfd), 1;
 141         }
 142
 143         const char *
 144         wifi_perc(const char *interface)
 145         {
 146                 struct ieee80211_nodereq nr;
 147                 int q;
 148
 149                 if (load_ieee80211_nodereq(interface, &nr)) {
 150                         if (nr.nr_max_rssi) {
 151                                 q = IEEE80211_NODEREQ_RSSI(&nr);
 152                         } else {
 153                                 q = nr.nr_rssi >= -50 ? 100 :
 154                                     (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