components/wifi.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <errno.h>
   3 #include <ifaddrs.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <sys/ioctl.h>
   7 #include <sys/socket.h>
   8 #include <unistd.h>
   9
  10 #include "../util.h"
  11
  12 #if defined(__linux__)
  13         #include <limits.h>
  14         #include <linux/wireless.h>
  15
  16         const char *
  17         wifi_perc(const char *iface)
  18         {
  19                 int i, cur;
  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
  54                 if (!(datastart = strstr(buf, iface))) {
  55                         return NULL;
  56                 }
  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                 return bprintf("%d", (int)((float)cur / total * 100));
  63         }
  64
  65         const char *
  66         wifi_essid(const char *iface)
  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                 snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
  75
  76                 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
  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) < 0) {
  83                         fprintf(stderr, "ioctl 'SIOCGIWESSID': %s\n", strerror(errno));
  84                         close(sockfd);
  85                         return NULL;
  86                 }
  87
  88                 close(sockfd);
  89
  90                 if (!strcmp(id, "")) {
  91                         return NULL;
  92                 }
  93
  94                 return id;
  95         }
  96 #elif defined(__OpenBSD__)
  97         #include <net/if.h>
  98         #include <net/if_media.h>
  99         #include <net80211/ieee80211.h>
 100         #include <sys/select.h> /* before <sys/ieee80211_ioctl.h> for NBBY */
 101         #include <net80211/ieee80211_ioctl.h>
 102         #include <stdlib.h>
 103         #include <sys/types.h>
 104
 105         static int
 106         load_ieee80211_nodereq(const char *iface, struct ieee80211_nodereq *nr)
 107         {
 108                 struct ieee80211_bssid bssid;
 109                 int sockfd;
 110
 111                 memset(&bssid, 0, sizeof(bssid));
 112                 memset(nr, 0, sizeof(struct ieee80211_nodereq));
 113                 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 114                         fprintf(stderr, "socket 'AF_INET': %s\n",
 115                                 strerror(errno));
 116                         return 0;
 117                 }
 118                 strlcpy(bssid.i_name, iface, sizeof(bssid.i_name));
 119                 if ((ioctl(sockfd, SIOCG80211BSSID, &bssid)) < 0) {
 120                         fprintf(stderr, "ioctl 'SIOCG80211BSSID': %s\n",
 121                                 strerror(errno));
 122                         close(sockfd);
 123                         return 0;
 124                 }
 125                 strlcpy(nr->nr_ifname, iface, sizeof(nr->nr_ifname));
 126                 memcpy(&nr->nr_macaddr, bssid.i_bssid, sizeof(nr->nr_macaddr));
 127                 if ((ioctl(sockfd, SIOCG80211NODE, nr)) < 0 && nr->nr_rssi) {
 128                         fprintf(stderr, "ioctl 'SIOCG80211NODE': %s\n",
 129                                 strerror(errno));
 130                         close(sockfd);
 131                         return 0;
 132                 }
 133
 134                 return close(sockfd), 1;
 135         }
 136
 137         const char *
 138         wifi_perc(const char *iface)
 139         {
 140                 struct ieee80211_nodereq nr;
 141                 int q;
 142
 143                 if (load_ieee80211_nodereq(iface, &nr)) {
 144                         if (nr.nr_max_rssi) {
 145                                 q = IEEE80211_NODEREQ_RSSI(&nr);
 146                         } else {
 147                                 q = nr.nr_rssi >= -50 ? 100 : (nr.nr_rssi <= -100 ? 0 :
 148                                 (2 * (nr.nr_rssi + 100)));
 149                         }
 150                         return bprintf("%d", q);
 151                 }
 152
 153                 return NULL;
 154         }
 155
 156         const char *
 157         wifi_essid(const char *iface)
 158         {
 159                 struct ieee80211_nodereq nr;
 160
 161                 if (load_ieee80211_nodereq(iface, &nr)) {
 162                         return bprintf("%s", nr.nr_nwid);
 163                 }
 164
 165                 return NULL;
 166         }
 167 #endif