{"id":42225,"date":"2019-03-18T00:00:00","date_gmt":"2019-03-17T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/telegraf-elektronnaya-pochta-bez-interneta"},"modified":"2020-02-18T13:45:03","modified_gmt":"2020-02-18T10:45:03","slug":"telegraf-elektronnaya-pochta-bez-interneta","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/administrirovanie\/telegraf-elektronnaya-pochta-bez-interneta","title":{"rendered":"\u00abTelegraf\u00bb \u2014 e-po\u0161ta bez interneta","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dobar dan!<\/p>\n

\u017delio bih podijeliti zanimljive misli o stvaranju autonomne decentralizirane e-po\u0161te i demonstrirati rad ve\u0107 postoje\u0107e implementacije.<\/p>\n

Isprva je 'Telegraph' razvijan kao amaterski komunikacijski alat me\u0111u \u010dlanovima na\u0161e male studentske zajednice, koja je na ovaj ili onaj na\u010din posvetila svoju aktivnost ra\u010dunalnoj tehni\u010dkoj i komunikacijama.<\/p>\n

Nota Bene<\/b>: 'Telegraph' je amaterski komunikacijski alat; prakti\u010dna korist u industrijskim razmjerima \u010dini se prili\u010dno problemati\u010dnom, me\u0111utim te\u0161ko da bi se ovaj problem mogao nazvati zna\u010dajnim \u2014 najva\u017eniji cilj nam je privu\u0107i pa\u017enju na razvoj ovakvih komunikacijskih sustava.<\/p>\n

Skloni smo vjerovati da je pove\u0107anje op\u0107e zainteresiranosti za razvoj raznih komunikacijskih sustava potrebno i dovoljno va\u017eno, budu\u0107i da razumijevanje osnovnih principa kako ti sustavi rade i na \u010demu se temelje \u2014 klju\u010d za pove\u0107anje osvije\u0161tenosti gra\u0111ana o pitanjima informacijske sigurnosti.<\/p>\n

\"\u00abTelegraf\u00bb
\n<\/a><\/noindex>
\nAchtung!<\/b>Kako bismo izbjegli mogu\u0107e nesporazume \u2014 u nekim slu\u010dajevima slike se mogu pregledavati:
\n\"\u00abTelegraf\u00bb
\n
\nSustav se temelji na dobrovoljnom radu i \u010distom entuzijazmu \u2014 jednostavno u\u017eivamo u onome \u0161to radimo. Mo\u017eete to smatrati hobijem i ne\u0107ete pogrije\u0161iti \u2014 budu\u0107i da jo\u0161 uvijek postoje ljubitelji komunikacije putem papirnate korespondencije; 'Telegraph' se u ve\u0107ini slu\u010dajeva mo\u017ee zamisliti kao digitalna implementacija principa rada obi\u010dne po\u0161te.<\/p>\n

'Telegraph' je autonomni analog e-po\u0161te, koji omogu\u0107ava slanje jednostavnih tekstualnih poruka bez kori\u0161tenja interneta. 'Telegraph' se mo\u017ee svrstati u Sneakernet<\/a><\/noindex> \u2014 na\u010din razmjene informacija bez kori\u0161tenja mre\u017ee.<\/p>\n

Kao po\u0161tanski sandu\u010di\u0107i koriste se USB flash diskovi, dok terminali slu\u017ee kao po\u0161tanske ispostave \u2014 ra\u010dunala koja predstavljaju svojevrsne pristupne to\u010dke za primanje i slanje elektroni\u010dke korespondencije.<\/p>\n

Pogledajmo najjednostavniji primjer interakcije s sustavom. Imamo dvije USB memorijske jedinice i jedan terminal. U samom skriptu su definirane potrebne globalne varijable za daljnju interakciju sa sustavom - broj terminala, put do korijena i sli\u010dno.<\/p>\n

Ako priklju\u010dimo prijenosni ure\u0111aj na terminal i pokrenemo skript, poku\u0161at \u0107e prikupiti izlazne poruke iz direktorija \/mnt\/Telegraph\/Outbox<\/b> i premjestiti ih u svoju memoriju, a zatim provjeriti postoje li u njegovoj memoriji nove poruke za trenutnog korisnika. Ako ih ima - zapisuje ih u \/mnt\/Telegraph\/Inbox<\/b>.<\/p>\n

Registracija novih ure\u0111aja<\/h2>\n

\nDoga\u0111a se prili\u010dno obi\u010dnim putem. Skript pronalazi nove USB memorijske ure\u0111aje priklju\u010dene na sustav i poku\u0161ava uskladiti njihove jedinstvene identifikatore s onima koji su predstavljeni u korijenu. Ako ure\u0111aji ranije nisu bili registrirani, bit \u0107e formatirani prema pravilima 'Telegraga'.<\/p>\n

Nakon registracije novog ure\u0111aja, struktura korijena izgleda ovako:<\/p>\n

Pogledajte post na imgur.com<\/a><\/noindex><\/p><\/blockquote>\n

\nU konfiguracijskoj datoteci config.ini<\/b>, koja se nalazi u korijenu USB memorijske jedinice, nalaze se sustavne informacije - jedinstveni identifikator i tajni klju\u010d.<\/p>\n

Pogledajte post na imgur.com<\/a><\/noindex><\/p><\/blockquote>\n

<\/p>\n

Dajte ljudima rum!<\/h2>\n

\nNe, ozbiljno! Izvore se mo\u017ee prona\u0107i ovdje<\/a><\/noindex>, a mi polako moramo prelaziti s teorije na praksu.<\/p>\n

Ali moram re\u0107i jo\u0161 nekoliko rije\u010di o tome kako je sustav za razmjenu poruka zapravo organiziran.<\/p>\n

Za po\u010detak, razjasnimo iz \u010dega se sastoji jedanaesteroznamenkasti jedinstveni identifikator. Na primjer, 10455000001<\/b>.<\/p>\n

Prva znamenka, 1<\/b>, odgovara za broj dr\u017eave. Me\u0111unarodni kod - 0<\/b>, Rusija u ovom slu\u010daju - 1<\/b>.<\/p>\n

Nakon toga slijede \u010detiri znamenke koje odgovaraju broju regije u kojoj se nalazi terminal. 0455<\/b> - to je Kolomenski gradski okrug.<\/p>\n

Za njima slijede dvije znamenke, - 00<\/b>, - koje se izravno odnose na broj terminala.<\/p>\n

I tek tada - \u010detiri znamenke koje predstavljaju redni broj korisnika koji je dodijeljen ovom terminalu. Za nas je to - 0001<\/b>. Tako\u0111er postoji i 0000<\/b> - ovaj broj pripada samom terminalu. Na njega se ne mo\u017ee slati pisana korespondencija, ali samo terminal koristi ovaj broj za slanje slu\u017ebenih poruka korisnicima. Na primjer, ako dostava poruke nije uspjela iz odre\u0111enih razloga.<\/p>\n

Pogledajte post na imgur.com<\/a><\/noindex><\/p><\/blockquote>\n

\nU korijenu na\u0161e \"po\u0161tanske kutije\" nalaze se dvije direktorije potrebne za primanje i slanje tekstualnih poruka. Kada se ure\u0111aj priklju\u010di terminalu, iz direktorija \"Outbox\" na poslu\u017eitelj se isporu\u010duju odlazne poruke, dok se u direktorij \"Inbox\", logi\u010dno, u\u010ditavaju dolazne poruke.<\/p>\n

Svaka datoteka, ovisno o direktoriju, imenovana je brojem primatelja ili po\u0161iljatelja.<\/p>\n

Ako poku\u0161amo poslati poruku nepostoje\u0107em adresatu, terminal \u0107e nam poslati poruku o gre\u0161ci.<\/p>\n

Pogledajte post na imgur.com<\/a><\/noindex><\/p><\/blockquote>\n

\nMe\u0111utim, ako odlu\u010dimo poslati pismo adresatu koji se nalazi na drugom terminalu (neovisno o tome postoji li ili ne), bit \u0107e pohranjeno u memoriju terminala dok agent ne prenese pisanu korespondenciju s na\u0161eg terminala na svoj.<\/p>\n

Pogledajte post na imgur.com<\/a><\/noindex><\/p><\/blockquote>\n

\nKada agent po\u0161te 10500000000<\/b> (drugim rije\u010dima \u2014 po\u0161tar) priklju\u010di svoje ure\u0111aj na\u0161em terminalu, odlazna pisma \u0107e biti prenesena na njegov spremnik. Kasnije, kada priklju\u010di svoje ure\u0111aj svom terminalu, ova pisma \u0107e biti otpu\u0161tena u memoriju terminala i \u010dekat \u0107e da ih adresat preuzme na svoj USB ure\u0111aj.<\/p>\n

Sesija povezivanja<\/h2>\n

\nPoku\u0161ajmo prenijeti poruku s tekstom \"Pozdrav!\" od 10455000001<\/b> za 10455000002<\/b>.<\/p>\n

Pogledajte post na imgur.com<\/a><\/noindex><\/p><\/blockquote>\n

<\/p>\n

To je to!<\/h2>\n

\nBit \u0107u zahvalan na bilo kojoj kritici vezano uz izvorni kod projekta i samu \u010dlanku.<\/p>\n

Hvala na pa\u017enji.<\/p>\n

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

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