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est ht <\/strong><\/p>\n
In this post, we will build a simple network scanner using Scapy library in Python.<\/p>\n
if you don\u2019t have scapy<\/strong> installed , check the cap\u2019s official documentation<\/a> for installation.<\/p>\n
First, we gonna need to import essential methods fr<\/p>\n
from<\/strong> scapy.all import<\/strong> ARP, Ether, srp<\/span><\/pre>\nSecond, we gonna need to make an ARP request<\/a> as shown in the following image<\/a>:<\/p>\n
<\/p>\n
The network scanner will send the ARP request indicating who has some specific IP address, let\u2019s say \u201c192.168.1.1\u201d, cccxzczc the owner of that IP address ( the target ) will automatically respond saying that<\/strong> he is \u201c192.168.1.1\u201d, with that response, the MAC address will also be included in the packet, this allows us to successfully retrieve all network users\u2019 IP and MAC addresses simultaneously when we send a broadcast packet<\/a> ( sending a packet to all the devices in the network ).<\/p>\n
The ARP response is demonstrated in the following figure:<\/p>\n
So, let us craft these packets:<\/p>\n
target_ip = \"192.168.1.1\/24\"
# IP Address for the destination
# create ARP packet
arp = ARP(pdst=target_ip)
# create the Ether broadcast packet
# ff:ff:ff:ff:ff:ff MAC address indicates broadcasting
ether = Ether(dst=\"ff:ff:ff:ff:ff:ff\")
# stack them
packet = ether\/arp<\/span><\/pre>\n
Note: In case you sr with the notation \u201c\/24\u201d or \u201c\/16\u201d after the IP address, it is basically an IP range here, for example \u201c192.168.1.1\/24\u201d is a range from \u201c192.168.1.0\u201d to \u201c192.168.1.255\u201d, please read more about <\/em>CIDR Notation<\/em><\/a><\/p>\n
Now we have created these packets, we need to send them using function which sends and receives packets at layer 2, we set the timeout to 3 so the script won\u2019t get stuck:<\/p>\n
result = srp(packet, timeout=3)[0]<\/span><\/pre>\n
result now is a list of pairs that is of the format , let\u2019s iterate over them:<\/code><\/p>\n
# a list of<\/strong> clients, we will fill this<\/strong> in<\/strong> the upcoming loop clients = [] for<\/strong> sent, received in<\/strong> result: # for<\/strong> each response, append ip and mac address to `clients` list clients.append({'ip': received.psrc, 'mac': received.hwsrc})<\/span><\/pre>\nNow all we need to do is to print this list we have just filled:<\/h3>\n
# print clients
print(“Available devices in the network:”)
print(“IP” + ” “*18+”MAC”)
for<\/strong> client in<\/strong> clients:
print(“{:16} {}”.format(client[‘ip’], client[‘mac’]))<\/span><\/h5>\n
Full code:<\/p>\n
<\/span>Here is a screenshot of my result in my personal network:

<\/pre>\n
<\/p>\n
from<\/span> scapy.<\/span>all import<\/span> ARP,<\/span> Ether,<\/span> srp\ntarget_ip =<\/span> \"192.168.1.1\/24\"<\/span>\n# IP Address for the destination<\/span>\n# create ARP packet<\/span>\narp =<\/span> ARP(<\/span>pdst=<\/span>target_ip)<\/span>\n# create the Ether broadcast packet<\/span>\n# ff:ff:ff:ff:ff:ff MAC address indicates broadcasting<\/span>\nether =<\/span> Ether(<\/span>dst=<\/span>\"ff:ff:ff:ff:ff:ff\"<\/span>)<\/span>\n# stack them<\/span>\npacket =<\/span> ether\/<\/span>arp\nresult =<\/span> srp(<\/span>packet,<\/span> timeout=<\/span>3<\/span>,<\/span> verbose=<\/span>0<\/span>)<\/span>[<\/span>0<\/span>]<\/span>\n# a list of clients, we will fill this in the upcoming loop<\/span>\nclients =<\/span> [<\/span>]<\/span>\nfor<\/span> sent,<\/span> received in<\/span> result:<\/span>\n # for each response, append ip and mac address to `clients` list<\/span>\n clients.<\/span>append(<\/span>{<\/span>'ip'<\/span>:<\/span> received.<\/span>psrc,<\/span> 'mac'<\/span>:<\/span> received.<\/span>hwsrc}<\/span>)<\/span>\n# print clients<\/span>\nprint<\/span>(<\/span>\"Available devices in the network:\"<\/span>)<\/span>\nprint<\/span>(<\/span>\"IP\"<\/span> +<\/span> \" \"<\/span>*<\/span>18<\/span>+<\/span>\"MAC\"<\/span>)<\/span>\nfor<\/span> client in<\/span> clients:<\/span>\n print<\/span>(<\/span>\"{:16} {}\"<\/span>.<\/span>format(<\/span>client[<\/span>'ip'<\/span>]<\/span>,<\/span> client[<\/span>'mac'<\/span>]<\/span>)<\/span>)<\/span><\/pre>\n
Alright, we are done with this tutorial, see how you can extend this and make it more convenient to replace other scanning tools. H\u00c4\u00c4\u00c4\u00c4<\/p>\n<\/div>\n<\/div>\n<\/section>\n
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Originally published at <\/em>https:\/\/pgsyr.de<\/em><\/a> on March 13, 2020.<\/em><\/p>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n<\/article>\n
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<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
the est ht In this post, we will build a simple network scanner using Scapy library in Python. if you don\u2019t have scapy installed , check the cap\u2019s official documentation for installation. First, we gonna need to import essential methods fr from scapy.all import ARP, Ether, srp Second, we gonna need to make an ARP request as shown in the following …<\/p>\n
Adding and File Attachments in Helpie Wiki<\/span> Read More »<\/a><\/p>\n","protected":false},"author":63,"featured_media":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"helpdesk_category":[2],"helpie_tag":[],"helpie_add_tag":[],"helpie_up_tag":[],"_links":{"self":[{"href":"http:\/\/demo.helpiewp.com\/wiki-demo\/wp-json\/wp\/v2\/pauple_helpie\/913"}],"collection":[{"href":"http:\/\/demo.helpiewp.com\/wiki-demo\/wp-json\/wp\/v2\/pauple_helpie"}],"about":[{"href":"http:\/\/demo.helpiewp.com\/wiki-demo\/wp-json\/wp\/v2\/types\/pauple_helpie"}],"author":[{"embeddable":true,"href":"http:\/\/demo.helpiewp.com\/wiki-demo\/wp-json\/wp\/v2\/users\/63"}],"replies":[{"embeddable":true,"href":"http:\/\/demo.helpiewp.com\/wiki-demo\/wp-json\/wp\/v2\/comments?post=913"}],"version-history":[{"count":20,"href":"http:\/\/demo.helpiewp.com\/wiki-demo\/wp-json\/wp\/v2\/pauple_helpie\/913\/revisions"}],"predecessor-version":[{"id":2255,"href":"http:\/\/demo.helpiewp.com\/wiki-demo\/wp-json\/wp\/v2\/pauple_helpie\/913\/revisions\/2255"}],"wp:attachment":[{"href":"http:\/\/demo.helpiewp.com\/wiki-demo\/wp-json\/wp\/v2\/media?parent=913"}],"wp:term":[{"taxonomy":"helpdesk_category","embeddable":true,"href":"http:\/\/demo.helpiewp.com\/wiki-demo\/wp-json\/wp\/v2\/helpdesk_category?post=913"},{"taxonomy":"helpie_tag","embeddable":true,"href":"http:\/\/demo.helpiewp.com\/wiki-demo\/wp-json\/wp\/v2\/helpie_tag?post=913"},{"taxonomy":"helpie_add_tag","embeddable":true,"href":"http:\/\/demo.helpiewp.com\/wiki-demo\/wp-json\/wp\/v2\/helpie_add_tag?post=913"},{"taxonomy":"helpie_up_tag","embeddable":true,"href":"http:\/\/demo.helpiewp.com\/wiki-demo\/wp-json\/wp\/v2\/helpie_up_tag?post=913"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}