{"id":23681,"date":"2022-11-27T19:47:38","date_gmt":"2022-11-27T14:17:38","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-send-a-fake-udp-package-in-golang\/"},"modified":"2022-11-27T19:47:38","modified_gmt":"2022-11-27T14:17:38","slug":"solved-how-to-send-a-fake-udp-package-in-golang","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-send-a-fake-udp-package-in-golang\/","title":{"rendered":"[Solved] How to send a fake udp package in golang"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-47655127\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"47655127\" data-parentid=\"47633520\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>At the end I managed to make works this check to send in periods of 10 minuts an upd package with an mac address I know is gonna never be reached as following.<\/p>\n<pre><code>func (h *DHCPHandler) check() {\n    \/\/Fetch parameters from config file\n    config := getConfig() \/\/ here is a mac saved on a json file 01:ff:ff:ff:ff:ff\n    macFake, err := net.ParseMAC(config.MacFake)\n\n    if err != nil {\n            fmt.Println(\"error with the fake mac provided on the json file\", err)\n    }\n\n    \/\/ create connection\n    conn, err := net.Dial(\"udp4\", \"127.0.0.1:67\")\n    if err != nil {\n            fmt.Println(\"error with the connection\", err)\n    }\n\n    \/\/stay alive\n    for {\n            fmt.Fprintf(conn, \"GET \/ HTTP\/1.0\\r\\n\\r\\n\")\n            conn.Write(dhcp.RequestPacket(dhcp.Discover, macFake, h.ip, []byte{0, 1, 2, 3}, true, nil))\n            time.Sleep(10 * time.Minute)\n    }\n<\/code><\/pre>\n<p>}<\/p>\n<p>On the main function, I just need to call this check goroutine and add on the server side (ServeDHCP) this code:<\/p>\n<pre><code>    mac := p.CHAddr().String()\n    \/\/Fetch parameters from config file\n    config := getConfig()\n    if mac == config.MacFake { \/\/udp package received and a mac saved on a json file 01:ff:ff:ff:ff:ff\n            \/\/ send notification to restart if failure on a systemd\n            daemon.SdNotify(false, \"WATCHDOG=1\")\n            return\n    }\n<\/code><\/pre>\n<p>The last part needed is to add a systemd check, in my case I send the watchdog every 10 min, so, the systemd check will be setted it to 11min<\/p>\n<pre><code>[Service]\nExecStartPre=\/\/something \nWatchdogSec=11min \nRestart=on-failure\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How to send a fake udp package in golang <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] At the end I managed to make works this check to send in periods of 10 minuts an upd package with an mac address I know is gonna never be reached as following. func (h *DHCPHandler) check() { \/\/Fetch parameters from config file config := getConfig() \/\/ here is a mac saved on a &#8230; <a title=\"[Solved] How to send a fake udp package in golang\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-send-a-fake-udp-package-in-golang\/\" aria-label=\"More on [Solved] How to send a fake udp package in golang\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[5073,596,1439],"class_list":["post-23681","post","type-post","status-publish","format-standard","hentry","category-solved","tag-dhcp","tag-go","tag-udp"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How to send a fake udp package in golang - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-send-a-fake-udp-package-in-golang\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to send a fake udp package in golang - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] At the end I managed to make works this check to send in periods of 10 minuts an upd package with an mac address I know is gonna never be reached as following. func (h *DHCPHandler) check() { \/\/Fetch parameters from config file config := getConfig() \/\/ here is a mac saved on a ... 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