wmwifi/src/wireless.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <unistd.h>
   6 #include <X11/X.h>
   7 #include <X11/xpm.h>
   8 #include "wmwifi.h"
   9 #include <net/ethernet.h>
  10 #include <linux/if.h>
  11 #include <linux/socket.h>
  12 #include <linux/wireless.h>
  13
  14 /*
  15  * This is my quick and dirty way of accessing the Linux Wireless Extensions
  16  * from the /proc/net/wireless interface.
  17  * Open the file, and get the Interface name, link, level, and noise.
  18  * - Jess
  19  */
  20
  21 int get_wifi_info(struct wifi *wfi)
  22 {
  23     struct iwreq wrq;
  24     struct iw_range range;
  25     int skfd;
  26     float ret;
  27     int i;
  28     FILE *fp;
  29     char buff[1024] = "";
  30
  31     if (fp = fopen("/proc/net/wireless", "r")) {
  32     //if (fp = fopen("./demo.txt", "r")) {
  33         for (i = 0; i < (wfi->ifnum + 3); i++) {
  34             fgets(buff, sizeof(buff), fp);
  35             buff[strlen(buff) + 1] = '\0';
  36         }
  37         fclose(fp);
  38     } else {
  39         wfi->max_qual = -1;
  40         fprintf(stdout,
  41                 "ERROR: Cannot Open Linux Wireless Extensions!\n\b");
  42 //      exit(1);
  43     }
  44
  45     sscanf(buff, "%s %*s %f %d", &wfi->ifname, &wfi->link, &wfi->level);
  46     /* Don't know why I have to make a second call to sscanf
  47      * to pull wfi->noise, but for some wierd reason I cannot
  48      * pull it above along with the other stats.
  49      */
  50     sscanf(buff, "%*s %*s %*s %*s %d", &wfi->noise);
  51
  52     /* Thanks to Jeroen Nijhof <jnijhof@nijhofnet.nl>
  53      * for catching this, I guess I overlooked it.
  54      * Strip out the trailing ':' if exists.
  55      */
  56     if (wfi->ifname[strlen(wfi->ifname) - 1] == ':') {
  57             wfi->ifname[strlen(wfi->ifname) - 1] = '\0';
  58     }
  59
  60     memset(&wfi->essid, 0, IW_ESSID_MAX_SIZE + 1);
  61
  62     skfd = socket(AF_INET, SOCK_DGRAM, 0);
  63
  64     memset(&range, 0, sizeof(struct iw_range));
  65
  66     wrq.u.data.pointer = (caddr_t) & range;
  67     wrq.u.data.length = sizeof(struct iw_range);
  68     wrq.u.data.flags = 0;
  69     strncpy(wrq.ifr_name, wfi->ifname, IFNAMSIZ);
  70     ret = ioctl(skfd, SIOCGIWRANGE, &wrq);
  71     if (ret > -1) {
  72       ret = range.max_qual.qual;
  73     } else {
  74       fprintf(stdout, "ERROR\n");
  75     /* Maybe put auto-learning HERE? */
  76     }
  77
  78     wfi->max_qual = ret;
  79
  80     wrq.u.essid.pointer = (caddr_t) wfi->essid;
  81     wrq.u.essid.length = IW_ESSID_MAX_SIZE + 1;
  82     wrq.u.essid.flags = 0;
  83     ret = ioctl(skfd, SIOCGIWESSID, &wrq);
  84
  85     ret = ioctl(skfd, SIOCGIWRATE, &wrq);
  86     memcpy(&(wfi->bitrate), &(wrq.u.bitrate), sizeof(struct iw_param));
  87
  88     if (strlen(wfi->essid) < 1) {
  89         strcpy(wfi->essid, "not_set");
  90     }
  91
  92     if (wfi->link > wfi->max_link) {
  93         wfi->max_link = wfi->link;
  94     }
  95     if (wfi->max_link > wfi->max_qual) {
  96         wfi->max_qual = wfi->max_link;
  97     }
  98     /*
  99      * For debugging purposes.
 100      * Check these values against /proc/net/wireless and
 101      * iwconfig
 102      *
 103     fprintf(stdout, "wfi->ifname   -> %s\n", wfi->ifname);
 104     fprintf(stdout, "wfi->max_qual -> %f\n", wfi->max_qual);
 105     fprintf(stdout, "wfi->essid    -> %s\n", wfi->essid);
 106     fprintf(stdout, "wfi->link     -> %f\n", wfi->link);
 107     fprintf(stdout, "wfi->level    -> %d\n", wfi->level);
 108     fprintf(stdout, "wfi->noise    -> %d\n", wfi->noise - 0x100);
 109     fprintf(stdout, "wfi->bitrate  -> %d\n", wfi->bitrate.value);
 110     fprintf(stdout, "wfi->max_link -> %.f\n", wfi->max_link);
 111     */
 112
 113
 114     close(skfd);
 115
 116     return ret;
 117 }
 118
 119 void next_if(struct wifi *wfi)
 120 {
 121     int max;
 122
 123     max = get_max_ifs();
 124     wfi->max_link = 0;
 125
 126     if (wfi->ifnum < max) {
 127         wfi->ifnum++;
 128     } else {
 129         wfi->ifnum = 0;
 130     }
 131 }
 132 /* Not used anymore, how many mouse button's do
 133  * you have?
 134  */
 135 void last_if(struct wifi *wfi)
 136 {
 137     int max;
 138
 139     max = get_max_ifs();
 140     wfi->max_link = 0;
 141
 142     if (wfi->ifnum > 0) {
 143         wfi->ifnum--;
 144     } else {
 145         wfi->ifnum = max;
 146     }
 147 }
 148 int get_max_ifs(void)
 149 {
 150     FILE *fp;
 151     char buff[255];
 152     int i = 0;
 153
 154     if (fp = fopen("/proc/net/wireless", "r")) {
 155     //if (fp = fopen("./demo.txt", "r")) {
 156         for (i = -3; fgets(buff, sizeof(buff), fp); i++) {
 157         }
 158         fclose(fp);
 159     }
 160     return i;
 161 }