components/wifi.c
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/* See LICENSE file for copyright and license details. */
#if defined(__linux__)
#include <errno.h>
#include <ifaddrs.h>
#include <linux/wireless.h>
#include <sys/socket.h>
#include <stdio.h>
#include <limits.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include "../util.h"
const char *
wifi_perc(const char *iface)
{
int i, cur;
float perc;
int total = 70; /* the max of /proc/net/wireless */
char *p, *datastart;
char path[PATH_MAX];
char status[5];
FILE *fp;
snprintf(path, sizeof(path), "%s%s%s", "/sys/class/net/", iface,
"/operstate");
fp = fopen(path, "r");
if (fp == NULL) {
fprintf(stderr, "fopen '%s': %s\n", path,
strerror(errno));
return NULL;
}
p = fgets(status, 5, fp);
fclose(fp);
if(!p || strcmp(status, "up\n") != 0) {
return NULL;
}
fp = fopen("/proc/net/wireless", "r");
if (fp == NULL) {
fprintf(stderr, "fopen '/proc/net/wireless': %s\n",
strerror(errno));
return NULL;
}
for (i = 0; i < 3; i++) {
if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
break;
}
fclose(fp);
if (i < 2 || !p)
return NULL;
if ((datastart = strstr(buf, iface)) == NULL)
return NULL;
datastart = (datastart+(strlen(iface)+1));
sscanf(datastart + 1, " %*d %d %*d %*d\t\t %*d\t "
"%*d\t\t%*d\t\t %*d\t %*d\t\t %*d", &cur);
perc = (float)cur / total * 100.0;
return bprintf("%.0f", perc);
}
const char *
wifi_essid(const char *iface)
{
static char id[IW_ESSID_MAX_SIZE+1];
int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
struct iwreq wreq;
memset(&wreq, 0, sizeof(struct iwreq));
wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
if (sockfd == -1) {
fprintf(stderr, "socket 'AF_INET': %s\n",
strerror(errno));
return NULL;
}
wreq.u.essid.pointer = id;
if (ioctl(sockfd,SIOCGIWESSID, &wreq) == -1) {
fprintf(stderr, "ioctl 'SIOCGIWESSID': %s\n",
strerror(errno));
close(sockfd);
return NULL;
}
close(sockfd);
if (strcmp(id, "") == 0)
return NULL;
else
return id;
}
#elif defined(__OpenBSD__)
/* unimplemented */
#endif