{"id":36378,"date":"2019-10-31T22:11:20","date_gmt":"2019-10-31T19:11:20","guid":{"rendered":"https:\/\/prohoster.info\/blog\/napisanie-programmnogo-obespecheniya-s-funktsionalom-klient-servernyh-utilit-windows-part-01\/"},"modified":"2019-10-31T22:11:20","modified_gmt":"2019-10-31T19:11:20","slug":"napisanie-programmnogo-obespecheniya-s-funktsionalom-klient-servernyh-utilit-windows-part-01","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/napisanie-programmnogo-obespecheniya-s-funktsionalom-klient-servernyh-utilit-windows-part-01","title":{"rendered":"Windowsi kliendi-serveri utiliitide funktsioonidega tarkvaraarendus, osa 01","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Tere tulemast.<\/p>\n<p>T\u00e4na arutame kliendi-serveri rakenduste kirjutamise protsessi, mis t\u00e4idavad Windowsi standardsete utiliitide funktsioone, nagu Telnet, TFTP jne jne puhta Javaga. On selge, et ma ei too midagi uut \u2014 k\u00f5ik need utiliidid on juba aastaid edukalt t\u00f6\u00f6tanud, kuid arvan, et mitte k\u00f5ik ei tea, mis nende taga toimub.<\/p>\n<p>Sellest me allpool r\u00e4\u00e4gime. <br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nSelles artiklis, et mitte liiga pikaks venida, kirjutan ma lisaks \u00fcldisele teabele ainult Telnet serverist, kuid hetkel on olemas ka muud utiliidid \u2014 need tulevad j\u00e4rgnevates osades.<\/p>\n<p>Esiteks tasub selgusele j\u00f5uda, mis on Telnet, milleks seda vajatakse ja kuidas seda kasutada. Ma ei hakka allikaid s\u00f5nas\u00f5nalt tsiteerima (kui vajalik, lisan l\u00f5pus lingid teema materjalidele), \u00fctlen vaid, et Telnet v\u00f5imaldab kaugjuurdep\u00e4\u00e4su seadme k\u00e4sureale. Suuresti sellega tema funktsionaalsus l\u00f5ppeb (serveri sadama k\u00e4sitlemist ma teadlikult ei maininud, sellest hiljem). Seega, selle rakendamiseks peab klient v\u00f5tma sisendi, edastama selle serverile, proovima seda k\u00e4sureale edastada, lugema vastuse, kui see on olemas, edastama selle tagasi kliendile ja kuvama ekraanile, v\u00f5i veateate korral andma kasutajale m\u00f5ista, et midagi on valesti.<\/p>\n<p>Eespool mainitud realiseerimiseks on vajalik kaks t\u00f6\u00f6tavat klassi ning \u00fcks testimise klass, millest me serverit k\u00e4ivitame ja mille kaudu klient t\u00f6\u00f6tab.<br \/>\nSeega, praegune rakenduse struktuur sisaldab j\u00e4rgmist:<\/p>\n<ul>\n<li>TelnetClient<\/li>\n<li>TelnetClientTester<\/li>\n<li>TelnetServer<\/li>\n<li>TelnetServerTester<\/li>\n<\/ul>\n<p>\nK\u00e4ime neid k\u00f5iki l\u00e4bi:<\/p>\n<p><b>TelnetClient<\/b><\/p>\n<p>K\u00f5ik, mida see klass peab oskama, on saadetud k\u00e4ske edastada ja saadud vastuseid n\u00e4idata. Lisaks tuleb osata \u00fchenduda suvalise (nagu \u00fclal mainitud) kauad ja sellest lahti \u00f6elda.<\/p>\n<p>Selleks on rakendatud j\u00e4rgmised funktsioonid:<\/p>\n<p>Funktsioon, mis v\u00f5tab argumendiks soketi aadressi, avab \u00fchenduse ja k\u00e4ivitab sisendi- ja v\u00e4ljundi vood (voo muutujad on deklareeritud \u00fclal, t\u00e4ielikud allikad on artikli l\u00f5pus).<\/p>\n<pre><code class=\"java\"> public void run(String ip, int port)\n    {\n        try {\n            Socket socket = new Socket(ip, port);\n            InputStream sin = socket.getInputStream();\n            OutputStream sout = socket.getOutputStream();\n            Scanner keyboard = new Scanner(System.in);\n            reader = new Thread(()-&gt;read(keyboard, sout));\n            writer = new Thread(()-&gt;write(sin));\n            reader.start();\n            writer.start();\n        }\n        catch (Exception e) {\n            System.out.println(e.getMessage());\n        }\n    }\n<\/code><\/pre>\n<p>\nSama funktsiooni \u00fclek\u00e4ik, mis \u00fchendub vaikeporti \u2014 telneti puhul on see 23<\/p>\n<pre><code class=\"java\">\n    public void run(String ip)\n    {\n        run(ip, 23);\n    }\n<\/code><\/pre>\n<p>\nFunktsioon loeb klaviatuurilt s\u00fcmboleid ja saadab need v\u00e4ljund soketisse \u2014 mis iseloomulik, rea ja mitte s\u00fcmbolite re\u017eiimis:<\/p>\n<pre><code class=\"java\">\n    private void read(Scanner keyboard, OutputStream sout)\n    {\n        try {\n            String input = new String();\n            while (true) {\n                input = keyboard.nextLine();\n                for (char i : (input + \" n\").toCharArray())\n                    sout.write(i);\n            }\n        }\n        catch (Exception e) {\n            System.out.println(e.getMessage());\n        }\n    }\n<\/code><\/pre>\n<p>\nFunktsioon v\u00f5tab andmed socket'ilt ja kuvab need ekraanile<\/p>\n<pre><code class=\"java\">\n    private void write(InputStream sin)\n    {\n        try {\n            int tmp;\n            while (true){\n                tmp = sin.read();\n                System.out.print((char)tmp);\n            }\n        }\n        catch (Exception e) {\n            System.out.println(e.getMessage());\n        }\n    }\n<\/code><\/pre>\n<p>\nFunktsioon peatab andmete vastuv\u00f5tmise ja edastamise<\/p>\n<pre><code class=\"java\">\n    public void stop()\n    {\n        reader.stop();\n        writer.stop();\n    }\n}<\/code><\/pre>\n<p>\n<b>TelnetServer<\/b><\/p>\n<p>See klass peab sisaldama funktsionaalsust, mis aktsepteerib k\u00e4sku socket'ilt, saadab selle t\u00e4itmiseks ja saadab vastuse tagasi socket'ile. Programmis ei ole tahtlikult sisendandmete kontrolli, sest esiteks, isegi 'karbi telnetis' on v\u00f5imalik serveri ketas vormindada, ja teiseks, turvak\u00fcsimus on selles artiklis p\u00f5him\u00f5tteliselt k\u00f5rvale j\u00e4etud, mist\u00f5ttu ei saagi siin olla s\u00f5na kr\u00fcpteerimise v\u00f5i SSL-i kohta.<\/p>\n<p>Siin on kokku 2 funktsiooni (\u00fcks neist on \u00fclekoormatud), ja \u00fcldiselt ei ole see v\u00e4ga hea praktika, kuid antud \u00fclesande kontekstis n\u00e4gin ma sobivana j\u00e4tta k\u00f5ik nii, nagu see oli.<\/p>\n<pre><code class=\"java\"> boolean isRunning = true;\n    public void run(int port)    {\n\n        (new Thread(()-&gt;{ try {\n            ServerSocket ss = new ServerSocket(port); \/\/ loome serveri soketi, et siduda see \u00fclalmainitud pordiga\n            System.out.println(\"Port \" + port + \" ootab \u00fchendusi\");\n\n            Socket socket = ss.accept();\n            System.out.println(\"\u00dchendatud\");\n            System.out.println();\n\n            \/\/ Saame soketi sisendi ja v\u00e4ljundi voogude k\u00e4tte, n\u00fc\u00fcd saame andmeid kliendile saata ja vastu v\u00f5tta.\n            InputStream sin = socket.getInputStream();\n            OutputStream sout = socket.getOutputStream();\n\n            Map env = System.getenv();\n            String wayToTemp = env.get(\"TEMP\") + \"tmp.txt\";\n            for (int i : (\"\u00dchendatudnnr\".toCharArray()))\n                sout.write(i);\n            sout.flush();\n\n            String buffer = new String();\n            while (isRunning) {\n\n                int intReader = 0;\n                while ((char) intReader != 'n') {\n                    intReader = sin.read();\n                    buffer += (char) intReader;\n                }\n\n\n                final String inputToSubThread = \"cmd \/c \" + buffer.substring(0, buffer.length()-2) + \" 2&gt;&amp;1\";\n\n\n                new Thread(() -&gt; {\n                    try {\n\n                        Process p = Runtime.getRuntime().exec(inputToSubThread);\n                        InputStream out = p.getInputStream();\n                        Scanner fromProcess = new Scanner(out);\n                        try {\n\n                            while (fromProcess.hasNextLine()) {\n                                String temp = fromProcess.nextLine();\n                                System.out.println(temp);\n                                for (char i : temp.toCharArray())\n                                    sout.write(i);\n                                sout.write('n');\n                                sout.write('r');\n                            }\n                        }\n                        catch (Exception e) {\n                            String output = \"Midagi l\u00e4ks valesti... Viga kood: \" + e.getStackTrace();\n                            System.out.println(output);\n                            for (char i : output.toCharArray())\n                                sout.write(i);\n                            sout.write('n');\n                            sout.write('r');\n                        }\n\n                        p.getErrorStream().close();\n                        p.getOutputStream().close();\n                        p.getInputStream().close();\n                        sout.flush();\n\n                    }\n                    catch (Exception e) {\n                        System.out.println(\"Viga: \" + e.getMessage());\n                    }\n                }).start();\n                System.out.println(buffer);\n                buffer = \"\";\n\n            }\n        }\n        catch(Exception x) {\n            System.out.println(x.getMessage());\n        }})).start();\n\n    }\n<\/code><\/pre>\n<p>\nProgramm avab serveri pordi, loeb sellest andmeid, kuni kohtub k\u00e4skluse l\u00f5petamise s\u00fcmboliga, edastab k\u00e4su uuele protsessile ja protsessi v\u00e4ljund suunatakse soketisse. K\u00f5ik on sama lihtne nagu Kahuri-Kasak.<\/p>\n<p>Seet\u00f5ttu on selle funktsiooni jaoks olemas \u00fclekoormus vaikimisi pordiga:<\/p>\n<pre><code class=\"java\"> public void run()\n    {\n        run(23);\n    }<\/code><\/pre>\n<p>\nNoh ja seega, funktsioon, mis peatab serveri \u2014 ka k\u00f5ik on triviaalne, see katkestab igavese ts\u00fckli, rikkudes selle tingimust.<\/p>\n<pre><code class=\"java\">    public void stop()\n    {\n        System.out.println(\"Server was stopped\");\n        this.isRunning = false;\n    }<\/code><\/pre>\n<p>\nMa ei too siia katseklasse, need on all \u2014 k\u00f5ik, mida nad teevad, on kontrollida avalike meetodite t\u00f6\u00f6v\u00f5imet. K\u00f5ik on git'is olemas.<\/p>\n<p>Kokkuv\u00f5tteks, paaril \u00f5htul on v\u00f5imalik m\u00f5ista peamisi k\u00e4sklusseadmete toimimise p\u00f5him\u00f5tteid. N\u00fc\u00fcd, kui me telnetime kaugele arvutisse, m\u00f5istame, mis toimub \u2014 maagia on kadunud)<\/p>\n<p>Nii et, lingid:<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/Toxa-p07a1330\/Temviewer\">K\u00f5ik l\u00e4htekoodid on, olid ja saavad olema siin<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/www.extrahop.com\/resources\/protocols\/telnet\/\">Telnetist<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/www.lifewire.com\/what-does-telnet-do-2483642\">Veel telnetist<\/a><\/noindex><br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/460569\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0438\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e. \u0421\u0435\u0433\u043e\u0434\u043d\u044f \u0445\u043e\u0442\u0435\u043b\u043e\u0441\u044c \u0431\u044b \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c \u043f\u0440\u043e\u0446\u0435\u0441\u0441 \u043d\u0430\u043f\u0438\u0441\u0430\u043d\u0438\u044f \u043a\u043b\u0438\u0435\u043d\u0442-\u0441\u0435\u0440\u0432\u0435\u0440\u043d\u044b\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u044e\u0449\u0438\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0445 \u0443\u0442\u0438\u043b\u0438\u0442 Windows, \u043a\u0430\u043a \u0442\u043e Telnet, TFTP, et cetera, et cetera \u043d\u0430 \u0447\u0438\u0441\u0442\u043e\u0439 Jav\u0430. \u041f\u043e\u043d\u044f\u0442\u043d\u043e, \u0447\u0442\u043e \u043d\u0438\u0447\u0435\u0433\u043e \u043d\u043e\u0432\u043e\u0433\u043e \u044f \u043d\u0435 \u043f\u0440\u0438\u0432\u043d\u0435\u0441\u0443 \u2014 \u0432\u0441\u0435 \u044d\u0442\u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u044b \u0443\u0436\u0435 \u0443\u0441\u043f\u0435\u0448\u043d\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0442 \u043d\u0435 \u043e\u0434\u0438\u043d \u0433\u043e\u0434, \u043d\u043e, \u043f\u043e\u043b\u0430\u0433\u0430\u044e, \u0447\u0442\u043e \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u043f\u043e\u0434 \u043a\u0430\u043f\u043e\u0442\u043e\u043c \u0443 \u043d\u0438\u0445 \u0437\u043d\u0430\u044e\u0442 \u043d\u0435 \u0432\u0441\u0435. \u0418\u043c\u0435\u043d\u043d\u043e \u043e\u0431 [&hellip;]<\/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":[688],"tags":[],"class_list":["post-36378","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" 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