Linux wifi поиск сети

How can I get a list of available wireless networks on Linux?

I would like to get a list of the wireless networks available. Ideally this would be via some C call, but I don’t mind if I have to kludge it with a system call. Even better if the required C call or program doesn’t require some exotic 3rd party package. The internet seems to suggest I use sudo iwlist scan which does seem to do the trick from the command line, but I’d rather not require root permissions. I only want to see the basics, not change anything.

You do not need to be root to run iwlist, but it will only report the cached values from the last periodic scan. To force a new scan you do need to be root.

3 Answers 3

It’s pretty easy to do a scan in the command line. The man pages are your friend here (check out iwconfig and iwlist). But using the C interface is a little more difficult so I’ll focus on that.

First of all, as other people have mentioned, definitely download out the wireless tools source code. All the documentation for the programming interface is in the .c files. As far as I can tell, there is no web documentation for the api. However, the source code is pretty easy to read through. You pretty much only need iwlib.h and iwlib.c for this question.

While you can use iw_set_ext and iw_get_ext , the libiw implements a basic scanning function iw_scan , from which you can extract most of the information that you need.

Here is a simple program to get the ESSID for all available wireless networks. Compile with -liw and run with sudo .

#include #include #include int main(void) < wireless_scan_head head; wireless_scan *result; iwrange range; int sock; /* Open socket to kernel */ sock = iw_sockets_open(); /* Get some metadata to use for scanning */ if (iw_get_range_info(sock, "wlan0", &range) < 0) < printf("Error during iw_get_range_info. Aborting.\n"); exit(2); >/* Perform the scan */ if (iw_scan(sock, "wlan0", range.we_version_compiled, &head) < 0) < printf("Error during iw_scan. Aborting.\n"); exit(2); >/* Traverse the results */ result = head.result; while (NULL != result) < printf("%s\n", result->b.essid); result = result->next; > exit(0); > 

DISCLAIMER: This is just a demonstration program. It’s possible for some results to not have an essid. In addition, this assumes your wireless interface is «wlan0». You get the idea.

Read the iwlib source code!

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Top 4 Linux WiFi Scanners

If you live in a populated area, you’ll likely be having several WiFi networks in your surrounding, each working on a specific WiFi channel.

This may affect your WiFi’s functionality unless you know which channel has minor traffic or is less congested.

Since WiFi channels with fewer users guarantee a speedy performance to every WiFi network, finding an ideal one may get complicated.

But it’s not impossible. Now you can use multiple WiFi channel checker tools, known as Linux WiFi scanners, to discover all available wireless networks in your area.

This article will tell you the four best Linux wireless scanners that you can use on almost all Linux distributions, such as Ubuntu and Linux Mint, to find the ideal nearby WiFi channel.

So please keep reading and learn everything you need to know about it!

Top 4 Linux Scanners for Wireless Networks

Using a Linux WiFi scanner lets you instantly figure out the optimal channel that comes within your WiFi network’s range.

Let’s take a look at the top 4 Linux WiFi Scanners.

1. LinSSID – Graphical WiFi Networks Scanner

LinSSID is an easy-to-use Linux scanner that can scan both types of networks, 2.4GHz, and 5GHz. Moreover, as it is written in C++ with the help of Linux wireless tools, it provides an ideal performance on all sorts of systems.

What’s more? It has a graphical user interface that quickly detects all nearby WiFi routers and even ad-hoc connections.

You can install LinSSID on your computer using PPA for DEB-based Linux distribution systems, including Linux Mint and Ubuntu.

Follow these steps to install and run LinSSID on your device:

ubuntu$ubuntu:~$ sudo add-apt-repository ppa:wseverin/ppa

ubuntu$ubuntu:~$ sudo apt-get update

ubuntu$ubuntu:~$ sudo apt install linssid -y

• You can launch LinSSID in two ways; as a root or as an ordinary user. Thus, if you want to access it as a normal user, you have first to use visudo to set the SUDO program and then take help from the gksudo system. Type the following command:

ubuntu$ubuntu:~$ sudo visudo

• You will use visudo as root for the configuration of the file ‘/etc/sudoers.’ Next, you have to add the “user ALL=/usr/bin/linssid” command line at the end of the file to get LinSSID’s root access.
• Finally, launch LinSSID by typing the command line:

gksudo linssid

On the other hand, you can also run the program directly from the menu. Once it’s launched, it will ask you for the password. Then, all you have to do is select the channel or interface you want to connect your WiFi connection with.

LinSSID’s graphical user interface will give you information about many things, like:

• SSID
• WiFi Channel
• Noise levels
• Signal Strength
• MAC Address
• Speed, etc

2. nmcli – A NetworkManager Controlling Tool

Network Management Command-Line Interface (nmcli) helps Linux distributions (with a graphical interface) control NetworkManager effectively.

Although nmcli doesn’t come with a graphical user interface, like every other Linux WiFi tool, you can easily use it to scan all the available WiFi networks within your computer’s range.

The key to using nmcli like a pro is knowing all the commands properly.

Once you install nmcli correctly on your device, you can get a list of available WiFi networks by typing this command:

nmcli dev wifi

If nmcli doesn’t work this way, you can use “sudo” to obtain the list with even more information about each wireless network. Enter this command:

nmcli -f ALL dev wifi

Besides, you can use nmcli for all standard Linux distributions with GNOME graphical user interface, including Ubuntu, Linux Mint, and others.

3. Wavemon – A ncurses-based Tool for Wireless Network Devices

Another tool that you can use to scan WiFi networks is Wavemon. Unfortunately, like nmcli, it doesn’t have a graphical user interface.

However, the good thing about this WiFi scanner is that it doesn’t ask you for a series of command lines for the installation process. That’s because this user-friendly ncurses-based tool has a Text User Interface (TUI) that lists down all the options on the main screen.

If you want to use Wavemon on Ubuntu, enter this command in the terminal to install it:

sudo apt install wavemon

Yes, you can use the application on other Linux distributions as well.

4. NetSpot – The Best WiFi Analyzer Tool

If your luck doesn’t work out with the Linux mentioned above WiFi scanners, you can download NetSpot on your computer. It is, so far, the most straightforward WiFi analysis tool that operates on both macOS and Windows.

It performs several wireless website surveys, analyses, and troubleshooting on your device.

Fortunately, the application comes for free, so you can give it a try if nothing works out for you.

The Bottom Line

Having the fastest internet connection without any interruption is like a dream come true. Fortunately, now you can turn it into a reality by installing the best Linux WiFi scanner on your computer.

All you have to do is copy and paste the command lines in the right places, install the scanners, and find the perfect WiFi channel for your network.

However, if you’re not good with tech-related things, you can opt for Wavemon and do all the scanning with fewer command lines!

Patrick Dobbins

Patrick Dobbins is a technology writer with over eight years of experience in the online market. He specializes in exploring apple products and talks about the latest features for the MacOs, iPhone, and iPad. Although his main area of expertise lies in Mac and iOS, he doesn’t stray far from Windows. In addition to writing for RottenWifi, Patrick has also made editorial contributions to other forums, including Business 2 Community and Tweak Your Biz. Apart from his work, Patrick is a husband and a father of two who enjoys heavy metal. He also knows his way around a piano, but he’s not as good at it as he is at writing.

Blog.rottenwifi.com is a participant in the Amazon Services LLC Associates Program which means we may get paid commissions on editorially chosen products purchased through our links to retailer sites. All names, logos, brands, and images are trademarks or copyrighted materials of their respective owners. Amazon and the Amazon logo are trademarks of Amazon.com, Inc., or its affiliates.

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Как отобразить доступные WiFi сети, их каналы, уровень сигнала и т.д. из командной строки

В этой статье объясняется, как использовать командную строку для просмотра доступных сетей Wi-Fi в Linux, списка их каналов, качества связи, безопасности, уровня сигнала и многого другого.
Это полезно для сканирования доступных сетей Wi-Fi, чтобы быстро определить уровень их сигнала, просмотра их каналов, чтобы увидеть, какой канал WiFi используется для уменьшения помех, и так далее и тому подобное.
Существует несколько методов/инструментов для сканирования доступных сетей Wi-Fi и перечисления их сведений, но в этой статье я перечисляю только 2 метода, которые просты в использовании и предоставляют достаточно информации для выполнения задачи.

Вариант №1: Сканируем и выводим список доступных WiFi-сетей с помощью nmcli

нмкли, Инструмент командной строки для управления состоянием сети и составления отчетов, может сканировать и составлять список доступных сетей WiFi, независимо от того, подключен ли WiFi к сети. Он уже должен быть установлен в вашем дистрибутиве Linux, нет необходимости указывать имя интерфейса, и он по умолчанию работает без привилегий суперпользователя (sudo), или, по крайней мере, так в моих тестах на Fedora и Ubuntu Situation. Используйте следующие команды для отображения доступных беспроводных сетей SSID, режимов, каналов, скоростей передачи, уровней сигнала, полос и безопасности:

Я видел, как некоторые пользователи говорят, что им нужно запускать nmcli с помощью sudo, чтобы показать доступные беспроводные сети, но это не тот случай, когда они пытаются использовать Fedora 31 и 30, Ubuntu 19.10 или 18.04. Однако, если nmcli ничего не отображает, попробуйте запустить его с помощью sudo:

Чтобы заставить nmcli отображать дополнительную информацию о сканируемой сети Wi-Fi, включая SSID-HEX, BSSID, частоту и т. д., запустите его следующим образом:

Скриншоты:

Это отобразит отсканированные данные WiFi в таблице. Если вы хотите переключиться на многострочный вид, чтобы вам не нужно было увеличивать ширину окна терминала, чтобы увидеть все детали, используйте -m multiline , так:

nmcli -m multiline -f ALL dev wifi

Чтобы использовать в скрипте, используйте краткий ( -t ) метод вывода:

Если вы хотите заставить nmcli повторно сканировать доступные сети Wi-Fi, используйте rescan Параметры:

Вариант 2. Используйте wavemon, чтобы получить список доступных сетей Wi-Fi.

ВейвмонТерминальный пользовательский интерфейс (TUI), использующий ncurses для мониторинга уровня беспроводного сигнала и шума, статистики пакетов, конфигурации устройства и параметров сети. Если вы не используете NetworkManager или просто предпочитаете nmcli, используйте его вместо nmcli.
Используйте его, чтобы получить список доступных точек доступа Wi-Fi, независимо от того, подключены ли они к сети Wi-Fi или нет. Инструмент требует прав суперпользователя (например, для запуска с помощью sudo) для сканирования доступных сетей Wi-Fi по умолчанию.
Wavemon может отображать следующую информацию о доступных (отсканированных) сетях Wi-Fi: SSID, BSSID (mac-адрес точки доступа), качество сигнала, мощность сигнала, канал и частоту WiFi. Wavemon не устанавливается по умолчанию, но многие дистрибутивы Linux доступны в следующих репозиториях. Установите следующим образом:

• Debian, Ubuntu, Linux Mint, Pop! _OS, Elementary OS и другие дистрибутивы Linux на базе Debian или Ubuntu:

sudo zypper install wavemon

Чтобы выполнить поиск доступных сетей Wi-Fi, нажмите F3 Перейдите на вкладку «Сканирование». Ищете продвинутый WiFi-сканер с большим количеством функций? Попробуйте Kismet, инструмент командной строки, который получил веб-интерфейс в апреле 2019 года.

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