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assocwatch.c

/* $Id: assocwatch.c 13 2003-10-08 23:05:37Z lennart $ */

/*
 * 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 <sys/types.h>
#include <sys/socket.h>

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <assert.h>

#include <linux/types.h> 
#include "netlink.h"
#include "rtnetlink.h"
#include <linux/if.h>
#include "wireless.h"

#include <libdaemon/dlog.h>

#include "util.h"
#include "assocwatch.h"
#include "nlapi.h"

static int handle_wireless_event(int idx, uint8_t *data, int l, int (*cb) (int idx, struct hw_addr *a)) {
    struct iw_event *e;
    int hs;
    struct hw_addr ap;

    e = (struct iw_event*) data;
    hs = sizeof(struct iw_event)-sizeof(union iwreq_data);
    while (l >= sizeof(struct iw_event)) {
        
        if (e->len < hs) {
            daemon_log(LOG_ERR, "ASSOCWATCH: Recieved corrupt wireless event\n");
            return -1;
        }
        
        switch (e->cmd) {
            
            case SIOCGIWAP: 
                if (e->len < hs + sizeof(struct sockaddr)) {
                    daemon_log(LOG_ERR, "ASSOCWATCH: Recieved corrupt AP wireless event\n");
                    return -1;
                }

                memcpy(ap.addr, e->u.ap_addr.sa_data, ETH_ALEN);

                if (cb(idx, is_assoc_ap(&ap) ? &ap : NULL) < 0)
                    return -1;

                return 0;
        }

        l -= e->len;
        e = (struct iw_event*) (((uint8_t*) e) + e->len);
    }
    
    return 0;
}

static int callback(struct nlmsghdr *n, void *u) {
    int (*cb) (int idx, struct hw_addr *a) = u;
    
    if (n->nlmsg_type == RTM_NEWLINK) {
        struct ifinfomsg* ifi;
        struct rtattr *a;
        int la;
        
        if (n->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifinfomsg))) {
            daemon_log(LOG_ERR, "ASSOCWATCH: Corrupt NETLINK message\n");
            return -1;
        }
        
        ifi = NLMSG_DATA(n);
        a = (void*) ifi + NLMSG_ALIGN(sizeof(struct ifinfomsg));
        la = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg));
            
        while (RTA_OK(a, la)) {
            if(a->rta_type == IFLA_WIRELESS)
                handle_wireless_event(ifi->ifi_index, RTA_DATA(a), RTA_PAYLOAD(a), cb);
            
            a = RTA_NEXT(a, la);
        }
    }

    return 0;
}


int assocwatch_init(int (*cb) (int idx, struct hw_addr *a)) {
    return nlapi_register(callback, cb);
}

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