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ap radar是一个Linux /基于GTK +基于图形netstumbler和无线档管理工具。这个项目使用了14个版的无线扩展在Linux 2.4.20和2.6提供接入点扫描功能

/* AP Radar
 * June 2002
 * [e-mail]
 *
 * This method comes from iwlist.c in the wireless-tools package
 *
 * Released under the MIT Open Source Licence
 * http://www.opensource.org/licenses/mit-license.php
 */

#include <iostream>
#include <string>
#include <iwlib.h>
#include "AccessPoint.h"
#include "AccessPointList.h"

AccessPointList *
print_scanning_info (int skfd, const char *ifname_const)
{
    AccessPointList *aplist;
    aplist = new AccessPointList;

    // AP Radar will compile under wireless extensions of 13 or
    // less, but it wont be able to scan for APs
    #if WIRELESS_EXT > 13
    struct iwreq wrq;
    unsigned char buffer[IW_SCAN_MAX_DATA];       /* Results */
    struct timeval tv;                            /* Select timeout */
    int timeout = 5000000;                        /* 5s */
    char *ifname = (char *) ifname_const;

    /* Init timeout value -> 250ms */
    tv.tv_sec = 0;
    tv.tv_usec = 250000;

    /*
     * Here we should look at the command line args and set the IW_SCAN_ flags
     * properly
     */
    wrq.u.param.flags = IW_SCAN_DEFAULT;
    wrq.u.param.value = 0;                        /* Later */

    /* Initiate Scanning */
    if (iw_set_ext (skfd, ifname, SIOCSIWSCAN, &wrq) < 0) {
        if (errno != EPERM) {
            fprintf (stderr,
                "%-8.8s  Interface doesn't support scanning : %s\n\n",
                ifname, strerror (errno));
            return (0);
        }
        /* If we don't have the permission to initiate the scan, we may
         * still have permission to read left-over results.
         * But, don't wait !!! */
        tv.tv_usec = 0;
    }
    //cout << "AP Scan requested. going into select loop" << endl;

    timeout -= tv.tv_usec;

    /* Forever */
    while (1) {
        fd_set rfds;                              /* File descriptors for select */
        int last_fd;                              /* Last fd */
        int ret;

        /* Guess what ? We must re-generate rfds each time */
        FD_ZERO (&rfds);
        last_fd = -1;

        /* In here, add the rtnetlink fd in the list */

        /* Wait until something happens */
        ret = select (last_fd + 1, &rfds, NULL, NULL, &tv);

        /* Check if there was an error */
        if (ret < 0) {
            if (errno == EAGAIN || errno == EINTR)
                continue;
            fprintf (stderr, "Unhandled signal - exiting...\n");
            return (0);
        }

        /* Check if there was a timeout */
        if (ret == 0) {
            /* Try to read the results */
            wrq.u.data.pointer = (char *) buffer;
            wrq.u.data.flags = 0;
            wrq.u.data.length = sizeof (buffer);
            if (iw_get_ext (skfd, ifname, SIOCGIWSCAN, &wrq) < 0) {
                /* Check if results not available yet */
                if (errno == EAGAIN) {
                    /* Restart timer for only 100ms */
                    tv.tv_sec = 0;
                    tv.tv_usec = 100000;
                    timeout -= tv.tv_usec;
                    if (timeout > 0)
                        continue;                 /* Try again later */
                }

                /* Bad error */
                fprintf (stderr, "%-8.8s  Failed to read scan data : %s\n\n",
                    ifname, strerror (errno));
                return (aplist);
            }
            else
                /* We have the results, go to process them */
                break;
        }

        /* In here, check if event and event type
         * if scan event, read results. All errors bad & no reset timeout */
    }

    if (wrq.u.data.length) {
        struct iw_event iwe;
        struct stream_descr stream;
        int ap_num = 1;
        int ret;
        struct iw_range range;
        int has_range;

        has_range = (iw_get_range_info (skfd, ifname, &range) >= 0);
        printf ("%-8.8s  Scan completed :\n", ifname);
        iw_init_event_stream (&stream, (char *) buffer, wrq.u.data.length);

        // loop through all the AP information
        // how do I associate an event with an AP?
        do {
            /* Extract an event and print it */
            ret = iw_extract_event_stream (&stream, &iwe);
            if (ret > 0) {
                /* Now, let's decode the event */
                switch (iwe.cmd) {

                    case SIOCGIWAP:
                        // Allocate a new AP structure
                        AccessPoint * newap;
                        newap = new AccessPoint;
                        aplist->push_back (newap);
                        //cout << "                    NEW AP from accesspoint scan" << endl;
                        newap->setBssid (iwe.u.ap_addr.sa_data);
                        break;

                    case SIOCGIWMODE:
                        //printf("                    Mode:%s %d\n",
                        //    iw_operation_mode[iwe.u.mode], iwe.u.mode);
                        // int32 mode. 1 = ad-hoc
                        newap->setMode (iwe.u.mode);
                        break;

                    case SIOCGIWESSID:
                        char essid[IW_ESSID_MAX_SIZE + 1];
                        if ((iwe.u.essid.pointer) && (iwe.u.essid.length))
                            memcpy (essid, iwe.u.essid.pointer, iwe.u.essid.length);
                        //printf("essid.length %d", iwe.u.essid.length);
                        essid[iwe.u.essid.length] = '\0';
                        if (iwe.u.essid.flags) {
                            /* Does it have an ESSID index ? */
                            if ((iwe.u.essid.flags & IW_ENCODE_INDEX) > 1) {
                                //printf("                    ESSID:\"%s\" [%d]\n", essid,
                                //    (iwe.u.essid.flags & IW_ENCODE_INDEX));
                            }
                            else {
                                //printf("                    ESSID:\"%s\"\n", essid);
                                //awin->add_button(essid);
                                newap->setEssid (new string (essid));
                            }
                        }
                        else {
                            //printf("                    ESSID:off/any\n");
                        }
                        break;

                    case SIOCGIWENCODE:
                        unsigned char key[IW_ENCODING_TOKEN_MAX];
                        if (iwe.u.data.pointer)
                            memcpy (key, iwe.u.essid.pointer, iwe.u.data.length);
                        else
                            iwe.u.data.flags |= IW_ENCODE_NOKEY;
                        //printf("                    Encryption key:");
                        if (iwe.u.data.flags & IW_ENCODE_DISABLED) {
                            //printf("off\n");
                            newap->setWEP (0);
                        }
                        else {
                            newap->setWEP (1);
                        }
                        break;

                    case SIOCGIWFREQ:
                        double freq;              /* Frequency/channel */
                        freq = iw_freq2float(&iwe.u.freq);
                        //printf("                    %s\n", buffer);
                        newap->setFrequency (freq);
                        break;

                    case SIOCGIWRATE:
                        //double rate = iwe.u.bitrate.value;
                        //printf("                    Bit Rate:%d\n", iwe.u.bitrate.value);

                        break;

                    case IWEVQUAL:
                        /* Not that reliable, disable */
                        iwe.u.qual.updated = 0x0;

                        if (has_range && (iwe.u.qual.level != 0)) {
                            /* If the statistics are in dBm */
                            if (iwe.u.qual.level > range.max_qual.level) {
                                /* Statistics are in dBm (absolute power measurement) */
                                int quality = iwe.u.qual.level - 0x100;
                                //printf("             quality: %d\n", quality);
                                newap->setSignalStrength (quality);

                            }
                        }

                        break;

                    #if WIRELESS_EXT >= 15
                    case IWEVCUSTOM:
                        char custom[IW_CUSTOM_MAX+1];
                        if((iwe.u.data.pointer) && (iwe.u.data.length))
                            memcpy(custom, iwe.u.data.pointer, iwe.u.data.length);
                        custom[iwe.u.data.length] = '\0';
                        printf("                    Extra:%s\n", custom);

                        break;
                    #endif

                    default:
                        printf ("                    (Unknown Wireless Token 0x%04X)\n",
                            iwe.cmd);
                        break;
                }                                 // switch(iwe.cmd)
            }                                     // if(ret>0)
            else
                printf ("%-8.8s  No scan results\n", ifname);
        } while(ret>0);                           // do
        printf ("\n");

        #else
        #warning Kernel version doesnt support wireless scanning
        printf ("AP Radar compiled without scanning capabilites.\n");
        #endif

        return (aplist);
    }                                             // if (wrq.u.
}


/*
 * Copyright (c) 2002 Donald G. Park
 * The MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */