{"id":32586,"date":"2019-10-31T21:47:51","date_gmt":"2019-10-31T18:47:51","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kompaniya-cloudflare-opublikovala-xdpcap-analizator-trafika-na-osnove-podsistemy-xdp\/"},"modified":"2019-10-31T21:47:51","modified_gmt":"2019-10-31T18:47:51","slug":"kompaniya-cloudflare-opublikovala-xdpcap-analizator-trafika-na-osnove-podsistemy-xdp","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sl\/blog\/news\/kompaniya-cloudflare-opublikovala-xdpcap-analizator-trafika-na-osnove-podsistemy-xdp","title":{"rendered":"Podjetje Cloudflare je objavilo xdpcap, analizator prometa, ki temelji na XDP podsystems.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Firma Cloudflare je predstavilo<\/a><\/noindex> odprti projekt xdpcap<\/a><\/noindex>, v okviru katerega se razvija analizator omre\u017enih paketov, podoben tcpdump, ki temelji na podvizijah XDP<\/a><\/noindex> (eXpress Data Path). Koda projekta je napisana v jeziku Go in se distribuira<\/a><\/noindex> pod licenco BSD. Projekt vklju\u010duje je bila pripravljena<\/a><\/noindex> knji\u017enico za vezavo eBPF obdelovalcev prometa iz aplikacij v jeziku Go.<\/p>\n

Orodje xdpcap je zdru\u017eljivo z izraznimi filtri tcpdump\/libpcap in omogo\u010da obdelavo znatno ve\u010djih koli\u010din prometa na istem omre\u017eju. Xdpcap se lahko uporablja tudi za odpravljanje napak v pogojih, kjer obi\u010dajni tcpdump ni mogo\u010d, na primer, ko delujejo sisteme filtriranja, za\u0161\u010dite pred napadi DoS in uravnote\u017eenja obremenitev, ki uporabljajo podvizijo jedra Linux XDP, ki obravnava pakete pred obdelavo v omre\u017enem skladu jedra Linux (tcpdump ne vidi paketov, ki jih je zavrnil obdelovalec XDP).<\/p>\n

Visoka zmogljivost se dose\u017ee s uporabo podvizij eBPF in XDP. eBPF je v jedro Linux vgrajen interpreter bajtne kode, ki omogo\u010da ustvarjanje visoko zmogljivih obdelovalcev prihodnjih\/odhodnih paketov z odlo\u010ditvami o njihovi preusmeritvi ali zavrnitvi. Z uporabo JIT prevajalnika se bajtna koda eBPF v realnem \u010dasu prevaja v strojne ukaze in izvaja s hitrostjo nativne kode. Podvizija XDP (eXpress Data Path) dopolnjuje eBPF z mo\u017enostjo izvajanja BPF programov na ravni omre\u017enega gonilnika, z neposrednim dostopom do DMA pomnilnika paketov in deluje pred dodeljevanjem pomnilnika skbuff omre\u017enemu skladu.<\/p>\n

Podobno kot tcpdump, orodje xdpcap na za\u010detku preva\u017ea visoko nivojska pravila filtriranja prometa v klasi\u010dno predstavitev BPF (cBPF) s pomo\u010djo standardne knji\u017enice libpcap, nato pa jih pretvori v obliko eBPF podprogramov z uporabo prevajalnika cbpfc<\/a><\/noindex>, ki uporablja tehnologije LLVM\/Clang. Na izhodu se podatki o prometu shranjujejo v standardnem formatu pcap, kar omogo\u010da uporabo pripravljenega v xdpcap zajetka prometa za nadaljnje analize v tcpdumpu in drugih obstoje\u010dih analizatorjih prometa. Na primer, za zajemanje podatkov o DNS prometu namesto ukaza «tcpdump ip and udp port 53» lahko za\u017eenete «xdpcap \/path\/to\/hook capture.pcap ‘ip and udp port 53′», nato pa uporabite datoteko capture.pcap, na primer z ukazom «tcpdump -r» ali v Wireshark.<\/p>\n

<\/a><\/noindex><\/p>\n

Izvor: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Cloudflare \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u0439 \u043f\u0440\u043e\u0435\u043a\u0442 xdpcap, \u0432 \u0440\u0430\u043c\u043a\u0430\u0445 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043f\u043e\u0445\u043e\u0436\u0438\u0439 \u043d\u0430 tcpdump \u0430\u043d\u0430\u043b\u0438\u0437\u0430\u0442\u043e\u0440 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432, \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u044b\u0439 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u044b XDP (eXpress Data Path). \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Go \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 BSD. \u041f\u0440\u043e\u0435\u043a\u0442\u043e\u043c \u0442\u0430\u043a\u0436\u0435 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u0430 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 \u0434\u043b\u044f \u043f\u0440\u0438\u0432\u044f\u0437\u043a\u0438 eBPF-\u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u0442\u0440\u0430\u0444\u0438\u043a\u0430 \u0438\u0437 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Go. \u0423\u0442\u0438\u043b\u0438\u0442\u0430 xdpcap \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u0430 \u0441 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u044f\u043c\u0438 \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438 tcpdump\/libpcap […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-32586","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Podjetje Cloudflare je objavilo xdpcap, analizator prometa na osnovi XDP podsistema | ProHoster","description":"Podjetje Cloudflare je predstavilo odprti 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