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/* $Id$ */
/*
* This file is part of waproamd.
*
* waproamd is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* waproamd is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with waproamd; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <net/if_arp.h>
#include <errno.h>
#include <assert.h>
#include <string.h>
#include <sys/ioctl.h>
#include <libdaemon/dlog.h>
#include "iwapi.h"
int iw_set_essid(struct interface *i, const char* essid) {
struct iwreq req;
char e[IW_ESSID_MAX_SIZE + 1];
memset(&req, 0, sizeof(req));
strncpy(req.ifr_ifrn.ifrn_name, i->name, IFNAMSIZ);
if (essid && *essid) {
memset(&e, 0, sizeof(e));
strncpy(e, essid, IW_ESSID_MAX_SIZE);
req.u.essid.pointer = e;
req.u.essid.length = strlen(essid) + 1;
req.u.essid.flags = 1;
}
if (ioctl(i->fd, SIOCSIWESSID, &req) < 0) {
daemon_log(LOG_ERR, "ioctl(SIOCSIWESSID): %s\n", strerror(errno));
return -1;
}
return 0;
}
int iw_set_mode(struct interface *i, int m) {
struct iwreq req;
memset(&req, 0, sizeof(req));
strncpy(req.ifr_ifrn.ifrn_name, i->name, IFNAMSIZ);
req.u.mode = m;
if (ioctl(i->fd, SIOCSIWMODE, &req) < 0) {
daemon_log(LOG_ERR, "ioctl(SIOCSIWMODE): %s\n", strerror(errno));
return -1;
}
return 0;
}
int iw_set_freq(struct interface *i, struct iw_freq *f) {
struct iwreq req;
memset(&req, 0, sizeof(req));
strncpy(req.ifr_ifrn.ifrn_name, i->name, IFNAMSIZ);
req.u.freq = *f;
if (ioctl(i->fd, SIOCSIWFREQ, &req) < 0) {
daemon_log(LOG_ERR, "ioctl(SIOCSIWFREQ): %s\n", strerror(errno));
return -1;
}
return 0;
}
int iw_set_ap(struct interface *i, struct hw_addr *ap) {
struct iwreq req;
memset(&req, 0, sizeof(req));
strncpy(req.ifr_ifrn.ifrn_name, i->name, IFNAMSIZ);
req.u.ap_addr.sa_family = ARPHRD_ETHER;
memcpy(req.u.ap_addr.sa_data, ap->addr, ETH_ALEN);
if (ioctl(i->fd, SIOCSIWAP, &req) < 0) {
daemon_log(LOG_ERR, "ioctl(SIOCSIWAP): %s\n", strerror(errno));
return -1;
}
return 0;
}
int iw_scan(struct interface *i) {
struct iwreq req;
memset(&req, 0, sizeof(req));
strncpy(req.ifr_ifrn.ifrn_name, i->name, IFNAMSIZ);
req.u.param.flags = IW_SCAN_DEFAULT;
req.u.param.value = 0;
if (ioctl(i->fd, SIOCSIWSCAN, &req) < 0) {
daemon_log(LOG_ERR, "ioctl(SIOCSIWSCAN): %s\n", strerror(errno));
return -1;
}
return 0;
}
int iw_scan_result(struct interface *i, int (*callback)(struct ap_info* ap)) {
struct ap_info ap;
int f, l, hs;
struct iwreq req;
struct iw_event *e;
uint8_t buffer[IW_SCAN_MAX_DATA];
assert(i && callback);
memset(&req, 0, sizeof(req));
strncpy(req.ifr_ifrn.ifrn_name, i->name, IFNAMSIZ);
req.u.data.pointer = buffer;
req.u.data.flags = 0;
req.u.data.length = sizeof(buffer);
if (ioctl(i->fd, SIOCGIWSCAN, &req) < 0) {
if (errno == EAGAIN)
return 1;
daemon_log(LOG_ERR, "ioctl(SIOCGIWSCAN): %s\n", strerror(errno));
return -1;
}
e = (struct iw_event*) req.u.data.pointer;
l = req.u.data.length;
f = 0;
hs = sizeof(struct iw_event)-sizeof(union iwreq_data);
while (l >= sizeof(struct iw_event)) {
if (e->len < hs) {
daemon_log(LOG_ERR, "Recieved bogus wireless event\n");
return -1;
}
if (!f)
memset(&ap, 0, sizeof(ap));
switch (e->cmd) {
case SIOCGIWAP:
f = 1;
if (e->len < hs + sizeof(struct sockaddr)) {
daemon_log(LOG_ERR, "Corrupt scan result (1)\n");
return -1;
}
memcpy(&ap.ap, e->u.ap_addr.sa_data, ETH_ALEN);
break;
case SIOCGIWESSID:
if (e->len < hs + sizeof(struct iw_point)) {
daemon_log(LOG_ERR, "Corrupt scan result (2)\n");
return -1;
}
memset(&ap.essid, 0, sizeof(ap.essid));
memcpy(&ap.essid, ((uint8_t*) e)+hs+sizeof(struct iw_point), MIN(sizeof(ap.essid)-1, e->len-hs-sizeof(struct iw_point)));
f |= 2;
break;
case SIOCGIWMODE:
if (e->len < hs + sizeof(__u32)) {
daemon_log(LOG_ERR, "Corrupt scan result (3)\n");
return -1;
}
if ((e->u.mode != IW_MODE_INFRA) && (e->u.mode != IW_MODE_MASTER))
f = 0; // Ignore non-APs
else
f |= 4;
break;
case SIOCGIWFREQ:
if (e->len < hs + sizeof(struct iw_freq)) {
daemon_log(LOG_ERR, "Corrupt scan result (4)\n");
return -1;
}
memcpy(&ap.freq, &e->u.freq, sizeof(struct iw_freq));
f |= 8;
break;
}
if (f == 15) {
if (callback(&ap) < 0)
return -1;
f = 0;
}
l -= e->len;
e = (struct iw_event*) (((uint8_t*) e) + e->len);
}
return 0;
}
int iw_tune(struct interface *i, struct ap_info *ap) {
assert(i && ap);
if (iw_set_mode(i, IW_MODE_INFRA) < 0)
return -1;
if (iw_set_essid(i, ap->essid) < 0)
return -1;
if (iw_set_freq(i, &ap->freq) < 0)
return -1;
if (iw_set_ap(i, &ap->ap) < 0)
return -1;
return 0;
}
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