FHWS/Indoor
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addded netlink and iw based wifi scanner for linux

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This commit is contained in:
FrankE
2017-10-10 17:00:12 +02:00
parent 7eb3a16e48
commit 628be72e1f
7 changed files with 601 additions and 23 deletions
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7
CMakeLists.txt
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@@ -65,7 +65,7 @@ else()
# system specific compiler flags # system specific compiler flags
ADD_DEFINITIONS( ADD_DEFINITIONS(
-std=gnu++11 -std=gnu++11
-Wall -Wall
-Werror=return-type -Werror=return-type
@@ -95,11 +95,16 @@ ADD_EXECUTABLE(
${SOURCES} ${SOURCES}
) )
SET(EXTRA_LIBS ${EXTRA_LIBS} nl-genl-3 nl-3)
INCLUDE_DIRECTORIES(/usr/include/libnl3/)
SET(EXTRA_LIBS ${EXTRA_LIBS} iw)
# needed external libraries # needed external libraries
TARGET_LINK_LIBRARIES( TARGET_LINK_LIBRARIES(
${PROJECT_NAME} ${PROJECT_NAME}
gtest gtest
pthread pthread
${EXTRA_LIBS}
) )
SET(CMAKE_C_COMPILER ${CMAKE_CXX_COMPILER}) SET(CMAKE_C_COMPILER ${CMAKE_CXX_COMPILER})

15
main.cpp
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@@ -10,8 +10,17 @@ class Test : public GridPoint {
#include "tests/Tests.h" #include "tests/Tests.h"
#include "sensors/radio/scan/WiFiScanLinux.h"
void wifi() {
const std::string dev = "wlp0s20u2u1";
WiFiScanLinux scanner(dev);
scanner.scan();
}
int main(int argc, char** argv) { int main(int argc, char** argv) {
wifi(); return 0;
#ifdef WITH_TESTS #ifdef WITH_TESTS
::testing::InitGoogleTest(&argc, argv); ::testing::InitGoogleTest(&argc, argv);
@@ -25,8 +34,8 @@ int main(int argc, char** argv) {
//::testing::GTEST_FLAG(filter) = "*Grid.*"; //::testing::GTEST_FLAG(filter) = "*Grid.*";
//::testing::GTEST_FLAG(filter) = "*Dijkstra.*"; //::testing::GTEST_FLAG(filter) = "*Dijkstra.*";
//::testing::GTEST_FLAG(filter) = "*LogDistanceCeilingModelBeacon*"; //::testing::GTEST_FLAG(filter) = "*LogDistanceCeilingModelBeacon*";
//::testing::GTEST_FLAG(filter) = "*WiFiOptimizer*"; //::testing::GTEST_FLAG(filter) = "*WiFiOptimizer*";
//::testing::GTEST_FLAG(filter) = "*Offline.readWrite*"; //::testing::GTEST_FLAG(filter) = "*Offline.readWrite*";
@@ -41,7 +50,7 @@ int main(int argc, char** argv) {
//::testing::GTEST_FLAG(filter) = "*BVH*"; //::testing::GTEST_FLAG(filter) = "*BVH*";
//::testing::GTEST_FLAG(filter) = "*Barometer*"; //::testing::GTEST_FLAG(filter) = "*Barometer*";
//::testing::GTEST_FLAG(filter) = "*GridWalk2RelPressure*"; //::testing::GTEST_FLAG(filter) = "*GridWalk2RelPressure*";
//::testing::GTEST_FLAG(filter) = "Heading*"; //::testing::GTEST_FLAG(filter) = "Heading*";

38
sensors/MACAddress.h
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@@ -47,27 +47,27 @@ public:
MACAddress(const std::string& str) { MACAddress(const std::string& str) {
// sanity check // sanity check
if (str.size() == 17 ){ if (str.size() == 17 ){
mac = 0; // all zeros mac = 0; // all zeros
fields.h5 = hexWordToInt(str[ 0], str[ 1]); fields.h5 = hexWordToInt(str[ 0], str[ 1]);
fields.h4 = hexWordToInt(str[ 3], str[ 4]); fields.h4 = hexWordToInt(str[ 3], str[ 4]);
fields.h3 = hexWordToInt(str[ 6], str[ 7]); fields.h3 = hexWordToInt(str[ 6], str[ 7]);
fields.h2 = hexWordToInt(str[ 9], str[10]); fields.h2 = hexWordToInt(str[ 9], str[10]);
fields.h1 = hexWordToInt(str[12], str[13]); fields.h1 = hexWordToInt(str[12], str[13]);
fields.h0 = hexWordToInt(str[15], str[16]); fields.h0 = hexWordToInt(str[15], str[16]);
} }
else if (str.size() == 12){ else if (str.size() == 12){
mac = 0; // all zeros mac = 0; // all zeros
fields.h5 = hexWordToInt(str[ 0], str[ 1]); fields.h5 = hexWordToInt(str[ 0], str[ 1]);
fields.h4 = hexWordToInt(str[ 2], str[ 3]); fields.h4 = hexWordToInt(str[ 2], str[ 3]);
fields.h3 = hexWordToInt(str[ 4], str[ 5]); fields.h3 = hexWordToInt(str[ 4], str[ 5]);
fields.h2 = hexWordToInt(str[ 6], str[ 7]); fields.h2 = hexWordToInt(str[ 6], str[ 7]);
fields.h1 = hexWordToInt(str[ 8], str[ 9]); fields.h1 = hexWordToInt(str[ 8], str[ 9]);
fields.h0 = hexWordToInt(str[10], str[11]); fields.h0 = hexWordToInt(str[10], str[11]);
} }
else{ else{
throw Exception("invalid hex string length. must be 17 or 12 (without :)"); throw Exception("invalid hex string length. must be 17 or 12 (without :)");
} }
} }

30
sensors/radio/scan/WiFiChannels.h Normal file
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@@ -0,0 +1,30 @@
#ifndef INDOOR_WIFICHANNELS_H
#define INDOOR_WIFICHANNELS_H
class WiFiChannels {
public:
static int freqToChannel(const int freq) {
switch(freq) {
case 2412: return 1;
case 2417: return 2;
case 2422: return 3;
case 2427: return 4;
case 2432: return 5;
case 2437: return 6;
case 2442: return 7;
case 2447: return 8;
case 2452: return 9;
case 2457: return 10;
case 2462: return 11;
case 2467: return 12;
case 2472: return 13;
case 2484: return 14;
}
throw "error";
}
};
#endif // INDOOR_WIFICHANNELS_H

15
sensors/radio/scan/WiFiScan.h Normal file
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@@ -0,0 +1,15 @@
#ifndef INDOOR_WIFI_SCAN_H
#define INDOOR_WIFI_SCAN_H
#include "../WiFiMeasurements.h"
class WiFiScan {
public:
/** scan for nearby access points */
virtual WiFiMeasurements scan() = 0;
};
#endif //INDOOR_WIFI_SCAN_H

419
sensors/radio/scan/WiFiScanLinux.h Normal file
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@@ -0,0 +1,419 @@
#ifndef INDOOR_WIFISCANNER_LINUX_H
#define INDOOR_WIFISCANNER_LINUX_H
/*
* scan_access_points.c: Prints all detected access points with wlan0 using NL80211 (netlink).
*
* Only works on network interfaces whose drivers are compatible with Netlink. Test this by running `iw list`.
*
* Since only privileged users may submit NL80211_CMD_TRIGGER_SCAN, you'll have to run the compiled program as root.
*
* Build with: gcc $(pkg-config --cflags --libs libnl-genl-3.0) scan_access_points.c
*
* Raspbian prerequisites:
* sudo apt-get install libnl-genl-3-dev
*
* Resources:
* http://git.kernel.org/cgit/linux/kernel/git/jberg/iw.git/tree/scan.c
* http://stackoverflow.com/questions/21601521/how-to-use-the-libnl-library-to-trigger-nl80211-commands
* http://stackoverflow.com/questions/23760780/how-to-send-single-channel-scan-request-to-libnl-and-receive-single-
*/
#include <errno.h>
#include <netlink/errno.h>
#include <netlink/netlink.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/ctrl.h>
#include <linux/nl80211.h>
#include <net/if.h>
#include <stdio.h>
#include <ctype.h>
#include <string>
#include "WiFiScan.h"
class WiFiScanLinux : public WiFiScan {
struct trigger_results {
int done;
int aborted;
};
struct handler_args { // For family_handler() and nl_get_multicast_id().
const char *group;
int id;
};
static int error_handler(struct sockaddr_nl* nla, struct nlmsgerr* err, void* arg) {
(void) nla;
// Callback for errors.
printf("error_handler() called.\n");
int* ret = (int*) arg;
*ret = err->error;
return NL_STOP;
}
static int finish_handler(struct nl_msg* msg, void* arg) {
(void) msg;
// Callback for NL_CB_FINISH.
int* ret = (int*) arg;
*ret = 0;
return NL_SKIP;
}
static int ack_handler(struct nl_msg* msg, void* arg) {
(void) msg;
// Callback for NL_CB_ACK.
int* ret = (int*)arg;
*ret = 0;
return NL_STOP;
}
static int no_seq_check(struct nl_msg* msg, void* arg) {
(void) msg;
(void) arg;
// Callback for NL_CB_SEQ_CHECK.
return NL_OK;
}
static int family_handler(struct nl_msg* msg, void* arg) {
// Callback for NL_CB_VALID within nl_get_multicast_id(). From http://sourcecodebrowser.com/iw/0.9.14/genl_8c.html.
struct handler_args* grp = (struct handler_args*) arg;
struct nlattr *tb[CTRL_ATTR_MAX + 1];
struct genlmsghdr* gnlh = (struct genlmsghdr*) nlmsg_data(nlmsg_hdr(msg));
struct nlattr *mcgrp;
int rem_mcgrp;
nla_parse(tb, CTRL_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL);
if (!tb[CTRL_ATTR_MCAST_GROUPS]) return NL_SKIP;
nla_for_each_nested(mcgrp, tb[CTRL_ATTR_MCAST_GROUPS], rem_mcgrp) { // This is a loop.
struct nlattr* tb_mcgrp[CTRL_ATTR_MCAST_GRP_MAX + 1];
nla_parse(tb_mcgrp, CTRL_ATTR_MCAST_GRP_MAX, (struct nlattr*) nla_data(mcgrp), nla_len(mcgrp), NULL);
if (!tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME] || !tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID]) continue;
if (strncmp((const char*) nla_data(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME]), grp->group,
nla_len(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME]))) {
continue;
}
grp->id = nla_get_u32(tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID]);
break;
}
return NL_SKIP;
}
int nl_get_multicast_id(struct nl_sock *sock, const char *family, const char *group) {
// From http://sourcecodebrowser.com/iw/0.9.14/genl_8c.html.
struct nl_msg *msg;
struct nl_cb *cb;
int ret, ctrlid;
struct handler_args grp = { .group = group, .id = -ENOENT, };
msg = nlmsg_alloc();
if (!msg) return -ENOMEM;
cb = nl_cb_alloc(NL_CB_DEFAULT);
if (!cb) {
ret = -ENOMEM;
goto out_fail_cb;
}
ctrlid = genl_ctrl_resolve(sock, "nlctrl");
genlmsg_put(msg, 0, 0, ctrlid, 0, 0, CTRL_CMD_GETFAMILY, 0);
ret = -ENOBUFS;
NLA_PUT_STRING(msg, CTRL_ATTR_FAMILY_NAME, family);
ret = nl_send_auto_complete(sock, msg);
if (ret < 0) goto out;
ret = 1;
nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &ret);
nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &ret);
nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, family_handler, &grp);
while (ret > 0) nl_recvmsgs(sock, cb);
if (ret == 0) ret = grp.id;
nla_put_failure:
out:
nl_cb_put(cb);
out_fail_cb:
nlmsg_free(msg);
return ret;
}
static void mac_addr_n2a(char *mac_addr, unsigned char *arg) {
// From http://git.kernel.org/cgit/linux/kernel/git/jberg/iw.git/tree/util.c.
int i, l;
l = 0;
for (i = 0; i < 6; i++) {
if (i == 0) {
sprintf(mac_addr+l, "%02x", arg[i]);
l += 2;
} else {
sprintf(mac_addr+l, ":%02x", arg[i]);
l += 3;
}
}
}
static void print_ssid(unsigned char *ie, int ielen) {
uint8_t len;
uint8_t *data;
int i;
while (ielen >= 2 && ielen >= ie[1]) {
if (ie[0] == 0 && ie[1] >= 0 && ie[1] <= 32) {
len = ie[1];
data = ie + 2;
for (i = 0; i < len; i++) {
if (isprint(data[i]) && data[i] != ' ' && data[i] != '\\') printf("%c", data[i]);
else if (data[i] == ' ' && (i != 0 && i != len -1)) printf(" ");
else printf("\\x%.2x", data[i]);
}
break;
}
ielen -= ie[1] + 2;
ie += ie[1] + 2;
}
}
static int callback_trigger(struct nl_msg *msg, void *arg) {
// Called by the kernel when the scan is done or has been aborted.
struct genlmsghdr* gnlh = (struct genlmsghdr*) nlmsg_data(nlmsg_hdr(msg));
struct trigger_results* results = (struct trigger_results*) arg;
//printf("Got something.\n");
//printf("%d\n", arg);
//nl_msg_dump(msg, stdout);
if (gnlh->cmd == NL80211_CMD_SCAN_ABORTED) {
printf("Got NL80211_CMD_SCAN_ABORTED.\n");
results->done = 1;
results->aborted = 1;
} else if (gnlh->cmd == NL80211_CMD_NEW_SCAN_RESULTS) {
printf("Got NL80211_CMD_NEW_SCAN_RESULTS.\n");
results->done = 1;
results->aborted = 0;
} // else probably an uninteresting multicast message.
return NL_SKIP;
}
static int callback_dump(struct nl_msg* msg, void* arg) {
(void) arg;
// Called by the kernel with a dump of the successful scan's data. Called for each SSID.
struct genlmsghdr* gnlh = (struct genlmsghdr*) nlmsg_data(nlmsg_hdr(msg));
char mac_addr[20];
struct nlattr *tb[NL80211_ATTR_MAX + 1];
struct nlattr *bss[NL80211_BSS_MAX + 1];
// static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
// [NL80211_BSS_TSF] = { .type = NLA_U64 },
// [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
// [NL80211_BSS_BSSID] = { },
// [NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 },
// [NL80211_BSS_CAPABILITY] = { .type = NLA_U16 },
// [NL80211_BSS_INFORMATION_ELEMENTS] = { },
// [NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
// [NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
// [NL80211_BSS_STATUS] = { .type = NLA_U32 },
// [NL80211_BSS_SEEN_MS_AGO] = { .type = NLA_U32 },
// [NL80211_BSS_BEACON_IES] = { },
// };
static struct nla_policy bss_policy[NL80211_BSS_MAX + 1];
memset(&bss_policy, 0, sizeof(bss_policy));
bss_policy[NL80211_BSS_TSF].type = NLA_U64;
bss_policy[NL80211_BSS_FREQUENCY].type = NLA_U32;
bss_policy[NL80211_BSS_BSSID];// = { };
bss_policy[NL80211_BSS_BEACON_INTERVAL].type = NLA_U16;
bss_policy[NL80211_BSS_CAPABILITY].type = NLA_U16;
bss_policy[NL80211_BSS_INFORMATION_ELEMENTS];// = { };
bss_policy[NL80211_BSS_SIGNAL_MBM].type = NLA_U32;
bss_policy[NL80211_BSS_SIGNAL_UNSPEC].type = NLA_U8;
bss_policy[NL80211_BSS_STATUS].type = NLA_U32;
bss_policy[NL80211_BSS_SEEN_MS_AGO].type = NLA_U32;
bss_policy[NL80211_BSS_BEACON_IES];// = { };
// Parse and error check.
nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL);
if (!tb[NL80211_ATTR_BSS]) {
printf("bss info missing!\n");
return NL_SKIP;
}
if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS], bss_policy)) {
printf("failed to parse nested attributes!\n");
return NL_SKIP;
}
if (!bss[NL80211_BSS_BSSID]) return NL_SKIP;
if (!bss[NL80211_BSS_INFORMATION_ELEMENTS]) return NL_SKIP;
const uint64_t seen_ago_ms = nla_get_u32(bss[NL80211_BSS_SEEN_MS_AGO]);
const int rssi = (nla_get_s32(bss[NL80211_BSS_SIGNAL_MBM])) / 100.0f;
// Start printing.
mac_addr_n2a(mac_addr, (unsigned char*) nla_data(bss[NL80211_BSS_BSSID]));
printf("%s, ", mac_addr);
printf("%d MHz, ", nla_get_u32(bss[NL80211_BSS_FREQUENCY]));
print_ssid((unsigned char*) nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]), nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]));
printf(" %d ms", seen_ago_ms);
printf(" %d dBm", rssi);
printf("\n");
return NL_SKIP;
}
int do_scan_trigger(struct nl_sock *socket, int if_index, int driver_id) {
// Starts the scan and waits for it to finish. Does not return until the scan is done or has been aborted.
struct trigger_results results = { .done = 0, .aborted = 0 };
struct nl_msg *msg;
struct nl_cb *cb;
struct nl_msg *ssids_to_scan;
int err;
int ret;
int mcid = nl_get_multicast_id(socket, "nl80211", "scan");
nl_socket_add_membership(socket, mcid); // Without this, callback_trigger() won't be called.
// Allocate the messages and callback handler.
msg = nlmsg_alloc();
if (!msg) {
printf("ERROR: Failed to allocate netlink message for msg.\n");
return -ENOMEM;
}
ssids_to_scan = nlmsg_alloc();
if (!ssids_to_scan) {
printf("ERROR: Failed to allocate netlink message for ssids_to_scan.\n");
nlmsg_free(msg);
return -ENOMEM;
}
cb = nl_cb_alloc(NL_CB_DEFAULT);
if (!cb) {
printf("ERROR: Failed to allocate netlink callbacks.\n");
nlmsg_free(msg);
nlmsg_free(ssids_to_scan);
return -ENOMEM;
}
// Setup the messages and callback handler.
genlmsg_put(msg, 0, 0, driver_id, 0, 0, NL80211_CMD_TRIGGER_SCAN, 0); // Setup which command to run.
nla_put_u32(msg, NL80211_ATTR_IFINDEX, if_index); // Add message attribute, which interface to use.
nla_put(ssids_to_scan, 1, 0, ""); // Scan all SSIDs.
nla_put_nested(msg, NL80211_ATTR_SCAN_SSIDS, ssids_to_scan); // Add message attribute, which SSIDs to scan for.
nlmsg_free(ssids_to_scan); // Copied to `msg` above, no longer need this.
nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, callback_trigger, &results); // Add the callback.
nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &err);
nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &err);
nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &err);
nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, no_seq_check, NULL); // No sequence checking for multicast messages.
// Send NL80211_CMD_TRIGGER_SCAN to start the scan. The kernel may reply with NL80211_CMD_NEW_SCAN_RESULTS on
// success or NL80211_CMD_SCAN_ABORTED if another scan was started by another process.
err = 1;
ret = nl_send_auto(socket, msg); // Send the message.
printf("NL80211_CMD_TRIGGER_SCAN sent %d bytes to the kernel.\n", ret);
printf("Waiting for scan to complete...\n");
while (err > 0) ret = nl_recvmsgs(socket, cb); // First wait for ack_handler(). This helps with basic errors.
if (err < 0) {
printf("WARNING: err has a value of %d.\n", err);
}
if (ret < 0) {
printf("ERROR: nl_recvmsgs() returned %d (%s).\n", ret, nl_geterror(-ret));
return ret;
}
while (!results.done) nl_recvmsgs(socket, cb); // Now wait until the scan is done or aborted.
if (results.aborted) {
printf("ERROR: Kernel aborted scan.\n");
return 1;
}
printf("Scan is done.\n");
// Cleanup.
nlmsg_free(msg);
nl_cb_put(cb);
nl_socket_drop_membership(socket, mcid); // No longer need this.
return 0;
}
int if_index;
struct nl_sock* socket;
int driver_id;
public:
WiFiScanLinux(const std::string& devName) {
if_index = if_nametoindex("wlp0s20u2u1"); // Use this wireless interface for scanning.
// Open socket to kernel.
socket = nl_socket_alloc(); // Allocate new netlink socket in memory.
genl_connect(socket); // Create file descriptor and bind socket.
driver_id = genl_ctrl_resolve(socket, "nl80211"); // Find the nl80211 driver ID.
}
/** triger WiFiScan and fetch the result */
WiFiMeasurements scan() {
// Issue NL80211_CMD_TRIGGER_SCAN to the kernel and wait for it to finish.
int err = do_scan_trigger(socket, if_index, driver_id);
if (err != 0) {
printf("do_scan_trigger() failed with %d.\n", err);
throw "error";
}
// Now get info for all SSIDs detected.
struct nl_msg *msg = nlmsg_alloc(); // Allocate a message.
genlmsg_put(msg, 0, 0, driver_id, 0, NLM_F_DUMP, NL80211_CMD_GET_SCAN, 0); // Setup which command to run.
nla_put_u32(msg, NL80211_ATTR_IFINDEX, if_index); // Add message attribute, which interface to use.
nl_socket_modify_cb(socket, NL_CB_VALID, NL_CB_CUSTOM, callback_dump, NULL); // Add the callback.
int ret = nl_send_auto(socket, msg); // Send the message.
printf("NL80211_CMD_GET_SCAN sent %d bytes to the kernel.\n", ret);
ret = nl_recvmsgs_default(socket); // Retrieve the kernel's answer. callback_dump() prints SSIDs to stdout.
nlmsg_free(msg);
if (ret < 0) {
printf("ERROR: nl_recvmsgs_default() returned %d (%s).\n", ret, nl_geterror(-ret));
throw "error";
}
// TODO
WiFiMeasurements mes;
return mes;
}
};
// gcc -I /usr/include/libnl3 main.c -lnl-genl-3 -lnl-3
#endif // INDOOR_WIFISCANNER_LINUX_H

100
sensors/radio/scan/WiFiScanLinux_IW.h Normal file
View File

@@ -0,0 +1,100 @@
#ifndef INDOOR_WIFI_SCAN_LINUX_H
#define INDOOR_WIFI_SCAN_LINUX_H
#include "WiFiChannels.h"
#include "WiFiScan.h"
#include "../WiFiMeasurements.h"
#include <stdio.h>
#include <time.h>
#include <iwlib.h>
#include <string>
#include <iostream>
class WiFiScanLinux : public WiFiScan {
private:
wireless_scan_head head;
wireless_scan *result;
iwrange range;
int sock;
std::string dev;
public:
WiFiScanLinux(const std::string& dev) : dev(dev) {
/* Open socket to kernel */
sock = iw_sockets_open();
std::cout << sock << std::endl;
}
WiFiMeasurements scan() override {
WiFiMeasurements res;
char* dev = (char*) this->dev.c_str();
/* Get some metadata to use for scanning */
if (iw_get_range_info(sock, dev, &range) < 0) {
printf("Error during iw_get_range_info. Aborting.\n");
exit(2);
}
if (range.we_version_compiled < 14) {
printf("scanning not supported");
exit(2);
}
// // params
// struct iwreq request;
// request.u.param.flags = IW_SCAN_DEFAULT;
// request.u.param.value = 0;
// if (iw_set_ext(sock, dev, SIOCSIWSCAN, &request) == -1) {
// printf("iw_set_ext(SIOCSIWSCAN)");
// exit(EXIT_FAILURE);
// }
/* Perform the scan */
if (iw_scan(sock, dev, range.we_version_compiled, &head) < 0) {
printf("Error during iw_scan. Aborting.\n");
exit(2);
}
/* Traverse the results */
result = head.result;
while (NULL != result) {
// access-point's MAC
const uint8_t* macPtr = (const uint8_t*) result->ap_addr.sa_data;
const uint64_t macLng = ((uint64_t)macPtr[5]<<40)|((uint64_t)macPtr[4]<<32)|((uint64_t)macPtr[3]<<24)|((uint64_t)macPtr[2]<<16)|((uint64_t)macPtr[1]<<8)|((uint64_t)macPtr[0]<<0);
const MACAddress mac(macLng);
const int8_t rssi = result->stats.qual.level;
const std::string ssid = result->b.essid;
result->b.
const int freq = (result->b.freq)/10e5;
const int channel = WiFiChannels::freqToChannel(freq);
//std::cout << ssid << "\t" << "freq: " << freq << "\t" << "rssi: " << (int) (rssi) << " dBm" << std::endl;
//printf("%s - %d\n", result->b.essid,
result = result->next;
std::cout << mac.asString() << "\t" << ssid << "\t" << channel << "\t" << (int)rssi << " dBm" << std::endl;
AccessPoint ap(mac, ssid);
WiFiMeasurement mes(ap, rssi);
res.entries.push_back(mes);
}
return res;
}
};
#endif //INDOOR_WIFI_SCAN_LINUX_H