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#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include "interface.h"
#include "util.h"
struct interface *interface_open(char *name) {
struct interface* i = NULL;
if (!(i = (struct interface*) malloc(sizeof(struct interface))))
return NULL;
memset(i, 0, sizeof(struct interface));
strncpy(i->name, name, IFNAMSIZ);
if ((i->fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
fprintf(stderr, "socket(): %s\n", strerror(errno));
goto fail;
}
return i;
fail:
if (i)
interface_close(i);
return NULL;
}
void interface_close(struct interface *i) {
assert(i);
if (i->fd >= 0)
close(i->fd);
free(i);
}
int interface_is_assoc(struct interface *i, struct hw_addr *ap) {
struct hw_addr ap2;
struct iwreq req;
struct iw_statistics q;
assert(i);
if (ap)
memset(ap->addr, 0, ETH_ALEN);
memset(&req, 0, sizeof(req));
strncpy(req.ifr_ifrn.ifrn_name, i->name, IFNAMSIZ);
if (ioctl(i->fd, SIOCGIWAP, &req) < 0) {
fprintf(stderr, "Failed to get AP address\n");
return -1;
}
memcpy(ap2.addr, &(req.u.ap_addr.sa_data), ETH_ALEN);
if (!is_assoc_ap(&ap2))
return 0;
memset(&req, 0, sizeof(req));
strncpy(req.ifr_ifrn.ifrn_name, i->name, IFNAMSIZ);
req.u.data.pointer = (caddr_t) &q;
req.u.data.length = sizeof(q);
req.u.data.flags = 1;
if (ioctl(i->fd, SIOCGIWSTATS, &req) < 0) {
fprintf(stderr, "Failed to get interface quality\n");
return -1;
}
if (q.qual.qual <= 0)
return 0;
if (ap)
memcpy(ap->addr, ap2.addr, ETH_ALEN);
return 1;
}
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