git clone https://github.com/michelbarbeau/wireless-network-programming.git
Usually the default configuration is fine, but if your wireless interface is called something other than wlan0, modifying label.h is necessary.
iwconfig is a standard program in Ubuntu. It shows the status of wireless devices on your system.
Sample output:
barbeau@ubuntu:~/wireless-network-programming$ iwconfig
eth0 no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"BELL150"
Mode:Managed Frequency:2.412 GHz Access Point: D8:6C:E9:2A:3C:CD
Bit Rate=1 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=65/70 Signal level=-45 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:54 Missed beacon:0
lo no wireless extensions.
label.h contains the device that should be used when running this program. Currently it's a compile-time dependency and the program must be recompiled if the device needs to be changed. (ie. you get errors saying that wlan0 does not exist)
barbeau@ubuntu:~/wireless-network-programming$ more label.h
// File: label.h
// Author: Michel Barbeau
// Version: January 16, 2016
//#define LABEL "eth0"
#define LABEL "wlan0"
Execute make in the project root directory.
If your system doesn't have g++ or make installed, on Ubuntu try installing build-essential using apt-get.
Example build output:
barbeau@ubuntu:~/wireless-network-programming$ make
g++ -std=c++0x -c Handler.cpp
g++ -std=c++0x -c WLAN.cpp
g++ -std=c++0x -c Sender.cpp
g++ -std=c++0x -c Receiver.cpp
g++ -std=c++0x WLAN.o Handler.o Sender.o -o sender
g++ -std=c++0x WLAN.o Handler.o Receiver.o -o receiver
Note: This program requires root access.
receiver output:
barbeau@ubuntu:~/wireless-network-programming$ sudo ./receiver
Initializing network interface : wlan0
socket created!
ifindex is: 3
hardware address is: 1c:bd:b9:7e:b6:5a
MTU is: 1500
socket bind done
from 20:68:9d:97:c5:f3 to ff:ff:ff:ff:ff:ff: E
from 20:68:9d:97:c5:f3 to ff:ff:ff:ff:ff:ff:
from 20:68:9d:97:c5:f3 to ff:ff:ff:ff:ff:ff: E
from 20:68:9d:97:c5:f3 to ff:ff:ff:ff:ff:ff:
from 20:68:9d:97:c5:f3 to ff:ff:ff:ff:ff:ff:
from 20:68:9d:97:c5:f3 to ff:ff:ff:ff:ff:ff:
from 1c:bd:b9:7e:b6:5a to ff:ff:ff:ff:ff:ff: This is a test frame
from 20:68:9d:97:c5:f3 to ff:ff:ff:ff:ff:ff:
from 1c:bd:b9:7e:b6:5a to ff:ff:ff:ff:ff:ff: This is a test frame
from 20:68:9d:97:c5:f3 to ff:ff:ff:ff:ff:ff:
from d8:6c:e9:2a:3c:cb to ff:ff:ff:ff:ff:ff:
from 20:68:9d:97:c5:f3 to ff:ff:ff:ff:ff:ff:
^C
Sender sends out messages to the broadcast address.
sender output:
barbeau@ubuntu:~/wireless-network-programming$ sudo ./sender
Initializing network interface : wlan0
socket created!
ifindex is: 3
hardware address is: 1c:bd:b9:7e:b6:5a
MTU is: 1500
socket bind done
config.sh puts your wlan0 interface into Ad-hoc mode.
config.sh output:
barbeau@ubuntu:~/wireless-network-programming$ sudo ./config.sh
wlan0 IEEE 802.11bgn ESSID:"MyCell"
Mode:Ad-Hoc Frequency:2.422 GHz Cell: 00:00:00:00:00:01
Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off