{"id":344,"date":"2008-01-05T18:18:33","date_gmt":"2008-01-05T18:18:33","guid":{"rendered":"http:\/\/pchero21.com\/?p=344"},"modified":"2008-01-05T18:18:33","modified_gmt":"2008-01-05T18:18:33","slug":"gethostbyaddr-%ed%95%a8%ec%88%98-%ed%98%b8%ec%b6%9c%ec%8b%9c-%eb%84%90null%ea%b0%92-%eb%a6%ac%ed%84%b4-%eb%ac%b8%ec%a0%9c","status":"publish","type":"post","link":"http:\/\/pchero21.com\/?p=344","title":{"rendered":"gethostbyaddr \ud568\uc218 \ud638\ucd9c\uc2dc \ub110(NULL)\uac12 \ub9ac\ud134 \ubb38\uc81c…"},"content":{"rendered":"

 \ucc38\uc73c\ub85c \uace8\uce58\uc544\ud508 \ubb38\uc81c\uc600\ub2e4. \ud558\uc9c0\ub9cc \ub2f5\uc740 \uac04\ub2e8\ud588\ub2e4.<\/p>\n

 \ubb38\uc81c\uc758 \uc2dc\uc791\uc810\uc740 gethostbyaddr() \ud568\uc218\ub97c \ud638\ucd9c\ud558\uba74\uc11c \uc2dc\uc791\ub410\ub2e4.<\/p>\n

 210.125.213.93 (\ubcf8\uc778 \ube14\ub85c\uadf8\uc758 IP)\uc8fc\uc18c. \uc5b4\ub77c???\uc548\ub3fc\ub124??<\/p>\n

 \ubb34\uc2a8 \ubb38\uc81c\uc77c\uae4c…..
 211.115.77.213 (daum \uc758 IP \uc8fc\uc18c). \uc774\uac83\ub3c4 \uc548\ub418\ub124??<\/p>\n

\"\uc0ac\uc6a9\uc790<\/p>\n

 \ubb34\uc2a8 \ubb38\uc81c\uac00 \uc788\ub098\ubcf4\ub2e4….\ub098\ub294 \ucc45\uc5d0 \ub098\uc628 \uc608\uc81c\ub97c \ub2e4\uc2dc \ud558\ub098\ud558\ub098 \ube44\uad50\ub97c \ud558\uba74\uc11c \ud639\uc2dc \uc788\uc744\uc9c0 \ubaa8\ub97c \ubbf8\uc2a4\ud0c0\uc774\ud551\uc744 \ucc3e\uc544\ubcf4\uc558\ub2e4.<\/p>\n

 \uadf8\ub7f0\ub370…\uc5c6.\uc5c8.\ub2e4.<\/p>\n

 \ub3c4\ub300\uccb4 \ubb34\uc5c7\uc774 \ubb38\uc81c\uc77c\uae4c…<\/p>\n

 \ud55c\ucc38 \uace0\ubbfc\uc744 \ud558\ub2e4\uac00 \ub514\ubc84\uae45\uc744 \ud574\ubcf4\uc558\ub2e4.<\/p>\n

 \uc5ed\uc2dc\ub098….gethostbyaddr()\ud568\uc218\ub97c \ud638\ucd9c\ud558\ub294 \ubd80\ubd84\uc5d0\uc11c \uc5d0\ub7ec\uac00 \ubc1c\uc0dd\ud588\ub2e4.
 
 \uc774 \ud568\uc218\uc758 \uc2e4\ud589\uacb0\uacfc\uac12\uc774 \ubc14\ub85c NULL \uac12\uc774\uc5c8\ub358 \uac83\uc774\ub2e4.<\/p>\n

 \uadf8\ub807\ub2e4\uba74 \uc65c NULL \uc744 \ubc18\ud658\ud560\uae4c…\uacc4\uc18d \uace0\ubbfc\ud574\ubcf4\uc558\ub2e4.<\/p>\n

 \ud639\uc2dc\ub098 \ub0b4\uac00 \uc778\uc790\uac12\uc758 \uc790\ub8cc\ud615\uc744 \uc798\ubabb \uc804\ub2ec\ud55c\uac74 \uc544\ub2d0\uae4c…\ud568\uc218\uc0ac\uc6a9\uc744 \uc81c\ub300\ub85c \ud558\uc9c0 \ubabb\ud55c\uac83\uc740 \uc544\ub2d0\uae4c…<\/p>\n

 \uba87\uc2dc\uac04\uc744 \uace0\ubbfc\ud55c \ub05d\uc5d0 \uaca8\uc6b0 \ub2f5\uc744 \uc5bb\uc744 \uc218 \uc788\uc5c8\ub2e4….<\/p>\n

 IP \uc8fc\uc18c\ub97c \ub3c4\uba54\uc778 \uc774\ub984\uc73c\ub85c \ubc14\uafb8\ub294 \uacfc\uc815\uc740 \uc5ed\ubc29\ud5a5\uc73c\ub85c \uc870\ud68c\ub97c \ud558\ub294 \uac83\uc774\ub2e4.<\/p>\n

 \uadf8\ub7f0\ub370 \uc774 \uc5ed\ubc29\ud5a5 \ub3c4\uba54\uc778 \uc8fc\uc18c\ub97c \uc870\ud68c\ud558\uae30 \uc704\ud574\uc11c\ub294 ISP\uc5d0\uc11c \ub530\ub85c\uc774 \ub4f1\ub85d\uc744 \ud574\uc918\uc57c \ud55c\ub2e4.<\/p>\n

 \ub2e4\uc2dc \uc124\uba85\uc744 \ud558\uc790\uba74….<\/p>\n

 daum.net == 211.115.77.213 \uc774\uac83\uc740 \uc870\ud68c\uac00 \uac00\ub2a5\ud558\uc9c0\ub9cc…(\ub124\uc784\uc11c\ubc84\ub97c \ud1b5\ud574\uc11c)<\/p>\n

 211.115.77.213 == daum.net \uc774\uac83\uc740 \uc870\ud68c\uac00 \ubd88\uac00\ub2a5\ud560 \uc218\ub3c4 \uc788\ub2e4\ub294 \uc774\uc57c\uae30\uc774\ub2e4.<\/p>\n

 \ud639\uc2dc\ub098 \uc2f6\uc5b4…\ud559\uad50 \ub124\uc784\uc11c\ubc84\uc758 IP\ub97c \ub123\uc5b4 \ubcf4\uc558\ub2e4.<\/p>\n

\"\uc0ac\uc6a9\uc790<\/p>\n

 \uc815\uc0c1\uc801\uc73c\ub85c \uc791\ub3d9\ud558\ub294 \uac83\uc774 \ubcf4\uc778\ub2e4 : )<\/p>\n

 \uc544\ub9c8\ub3c4 \ub098\uc640 \ube44\uc2b7\ud55c \uacbd\ud5d8\uc744 \ud558\ub294 \uc0ac\ub78c\ub4e4\uc774 \ub9ce\uc73c\ub9ac\ub77c \uc0dd\uac01\ub41c\ub2e4.<\/p>\n

 \ud558\uc9c0\ub9cc \uc790\uc2e0\uc758 \ud504\ub85c\uadf8\ub7a8\uc774 \uc798\ubabb\ub41c \uac83\uc740 \uc544\ub2c8\ub2c8 \uac71\uc815\ub9d0\uace0 \uc790\uc2e0\uc758 DNS\uc11c\ubc84\uc758 IP\ub97c \ub123\uc5b4\ubcf4\uac70\ub098 gethostbyname \ud568\uc218\ub97c \ud1b5\ud574 \uc54c\uc544\ub0b8 \uc815\ubcf4\uc911\uc5d0 ns.*****.*****\ub85c \uc2dc\uc791\ud558\ub294 \uc8fc\uc18c\uc758 IP\ub97c \ub123\uc5b4\ubcf4\uae38 \ubc14\ub780\ub2e4. <\/p>\n

 \uadf8\ub7ec\uba74 \uc544\uc8fc \uc798 \ub3d9\uc791\ud558\ub294 \uc790\uc2e0\uc758 \ud504\ub85c\uadf8\ub7a8\uc744 \ubcfc \uc218 \uc788\uc744 \uac83\uc774\ub2e4.<\/p>\n

 \ub2e4\uc74c\uc740 \ubcf8\uc778\uc774 \uc0ac\uc6a9\ud55c \ud504\ub85c\uadf8\ub7a8\uc758 \uc18c\uc2a4\uc774\ub2e4. \ucc38\uace0\uac00 \ub418\uae38 \ubc14\ub780\ub2e4 : )<\/p>\n

\ngethostbyaddr.c<\/span> (Language : c)<\/span><\/legend>\n
    \n
  1. \n
    \/***************************************************************************<\/span><\/div>\n<\/li>\n
  2. \n
    *            gethostbyaddr.c<\/span><\/div>\n<\/li>\n
  3. \n
    *<\/span><\/div>\n<\/li>\n
  4. \n
    *  Sat Jan  5 22:18:59 2008<\/span><\/div>\n<\/li>\n
  5. \n
    *  Copyright  2008  pchero21<\/span><\/div>\n<\/li>\n
  6. \n
    *  pchero21@gmail.com<\/span><\/div>\n<\/li>\n
  7. \n
    ****************************************************************************\/<\/span><\/div>\n<\/li>\n
  8. \n
     <\/div>\n<\/li>\n
  9. \n
    \/*<\/span><\/div>\n<\/li>\n
  10. \n
    *  This program is free software; you can redistribute it and\/or modify<\/span><\/div>\n<\/li>\n
  11. \n
    *  it under the terms of the GNU General Public License as published by<\/span><\/div>\n<\/li>\n
  12. \n
    *  the Free Software Foundation; either version 2 of the License, or<\/span><\/div>\n<\/li>\n
  13. \n
    *  (at your option) any later version.<\/span><\/div>\n<\/li>\n
  14. \n
    *<\/span><\/div>\n<\/li>\n
  15. \n
    *  This program is distributed in the hope that it will be useful,<\/span><\/div>\n<\/li>\n
  16. \n
    *  but WITHOUT ANY WARRANTY; without even the implied warranty of<\/span><\/div>\n<\/li>\n
  17. \n
    *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the<\/span><\/div>\n<\/li>\n
  18. \n
    *  GNU General Public License for more details.<\/span><\/div>\n<\/li>\n
  19. \n
    *<\/span><\/div>\n<\/li>\n
  20. \n
    *  You should have received a copy of the GNU General Public License<\/span><\/div>\n<\/li>\n
  21. \n
    *  along with this program; if not, write to the Free Software<\/span><\/div>\n<\/li>\n
  22. \n
    *  Foundation, Inc., 59 Temple Place – Suite 330, Boston, MA 02111-1307, USA.<\/span><\/div>\n<\/li>\n
  23. \n
    *\/<\/span><\/div>\n<\/li>\n
  24. \n
     <\/div>\n<\/li>\n
  25. \n
    #include <stdio.h><\/span><\/div>\n<\/li>\n
  26. \n
    #include <stdlib.h><\/span><\/div>\n<\/li>\n
  27. \n
    #include <string.h><\/span><\/div>\n<\/li>\n
  28. \n
    #include <unistd.h><\/span><\/div>\n<\/li>\n
  29. \n
    #include <arpa\/inet.h><\/span><\/div>\n<\/li>\n
  30. \n
    #include <netdb.h><\/span><\/div>\n<\/li>\n
  31. \n
     <\/div>\n<\/li>\n
  32. \n
     <\/div>\n<\/li>\n
  33. \n
    void<\/span> error_handling(<\/span>char<\/span> *message)<\/span>;<\/div>\n<\/li>\n
  34. \n
     <\/div>\n<\/li>\n
  35. \n
    int<\/span> main(<\/span>int<\/span> argc, char<\/span> **argv)<\/span><\/div>\n<\/li>\n
  36. \n
    {<\/span><\/div>\n<\/li>\n
  37. \n
        struct<\/span> hostent *host;<\/div>\n<\/li>\n
  38. \n
        struct<\/span> sockaddr_in addr;<\/div>\n<\/li>\n
  39. \n
        int<\/span> i;<\/div>\n<\/li>\n
  40. \n
        <\/div>\n<\/li>\n
  41. \n
        if<\/span>(<\/span>argc != 2<\/span>)<\/span> {<\/span><\/div>\n<\/li>\n
  42. \n
            printf<\/span><\/a>(<\/span>“Usage : %s <IP> n<\/span>“<\/span>, argv[<\/span>0<\/span>]<\/span>)<\/span>;<\/div>\n<\/li>\n
  43. \n
            exit(<\/span>1<\/span>)<\/span>;<\/div>\n<\/li>\n
  44. \n
        }<\/span><\/div>\n<\/li>\n
  45. \n
        <\/div>\n<\/li>\n
  46. \n
        memset(<\/span>&addr, 0<\/span>, sizeof<\/span>(<\/span>addr)<\/span>)<\/span>;<\/div>\n<\/li>\n
  47. \n
        addr.sin_addr<\/span>.s_addr<\/span> = inet_addr(<\/span>argv[<\/span>1<\/span>]<\/span>)<\/span>;<\/div>\n<\/li>\n
  48. \n
     <\/div>\n<\/li>\n
  49. \n
        host = gethostbyaddr(<\/span>(<\/span>char<\/span>*)<\/span>&(<\/span>addr.sin_addr<\/span>.s_addr<\/span>)<\/span>, 4<\/span>, AF_INET)<\/span>;<\/div>\n<\/li>\n
  50. \n
        if<\/span>(<\/span>!host)<\/span><\/div>\n<\/li>\n
  51. \n
            error_handling(<\/span>“gethostbyaddr() error!”<\/span>)<\/span>;<\/div>\n<\/li>\n
  52. \n
        <\/div>\n<\/li>\n
  53. \n
        printf<\/span><\/a>(<\/span>“Officially name : %s n<\/span>n<\/span>“<\/span>, host->h_name)<\/span>;<\/div>\n<\/li>\n
  54. \n
        <\/div>\n<\/li>\n
  55. \n
        puts(<\/span>“Aliases———————-“<\/span>)<\/span>;<\/div>\n<\/li>\n
  56. \n
        for<\/span>(<\/span>i = 0<\/span>; host->h_aliases[<\/span>i]<\/span>; i++)<\/span> {<\/span><\/div>\n<\/li>\n
  57. \n
            puts(<\/span>host->h_aliases[<\/span>i]<\/span>)<\/span>;<\/div>\n<\/li>\n
  58. \n
        }<\/span><\/div>\n<\/li>\n
  59. \n
        <\/div>\n<\/li>\n
  60. \n
        printf<\/span><\/a>(<\/span>“Address Type : %s n<\/span>“<\/span>, host->h_addrtype == AF_INET ? “AF_INET”<\/span> : “AF_INET6”<\/span>)<\/span>;<\/div>\n<\/li>\n
  61. \n
     <\/div>\n<\/li>\n
  62. \n
        puts(<\/span>“IP Address——————“<\/span>)<\/span>;<\/div>\n<\/li>\n
  63. \n
        for<\/span>(<\/span>i = 0<\/span>; host->h_addr_list[<\/span>i]<\/span>; i++)<\/span> {<\/span><\/div>\n<\/li>\n
  64. \n
            puts(<\/span>inet_ntoa(<\/span>*(<\/span>struct<\/span> in_addr*)<\/span>host->h_addr_list[<\/span>i]<\/span>)<\/span>)<\/span>;<\/div>\n<\/li>\n
  65. \n
        }<\/span><\/div>\n<\/li>\n
  66. \n
        return<\/span> 0<\/span>;<\/div>\n<\/li>\n
  67. \n
    }<\/span><\/div>\n<\/li>\n
  68. \n
     <\/div>\n<\/li>\n
  69. \n
    void<\/span> error_handling(<\/span>char<\/span> *message)<\/span><\/div>\n<\/li>\n
  70. \n
    {<\/span><\/div>\n<\/li>\n
  71. \n
        fputs(<\/span>message, stderr)<\/span>;<\/div>\n<\/li>\n
  72. \n
        fputc(<\/span>‘n<\/span>‘<\/span>, stderr)<\/span>;<\/div>\n<\/li>\n
  73. \n
        exit(<\/span>1<\/span>)<\/span>;<\/div>\n<\/li>\n
  74. \n
    }<\/span><\/div>\n<\/li>\n
  75. \n
     <\/div>\n<\/li>\n<\/ol>\n<\/fieldset>\n

    <\/p>\n","protected":false},"excerpt":{"rendered":"

     \ucc38\uc73c\ub85c \uace8\uce58\uc544\ud508 \ubb38\uc81c\uc600\ub2e4. \ud558\uc9c0\ub9cc \ub2f5\uc740 \uac04\ub2e8\ud588\ub2e4.  \ubb38\uc81c\uc758 \uc2dc\uc791\uc810\uc740 gethostbyaddr() \ud568\uc218\ub97c \ud638\ucd9c\ud558\uba74\uc11c \uc2dc\uc791\ub410\ub2e4.  210.125.213.93 (\ubcf8\uc778 \ube14\ub85c\uadf8\uc758 IP)\uc8fc\uc18c. \uc5b4\ub77c???\uc548\ub3fc\ub124??  \ubb34\uc2a8 \ubb38\uc81c\uc77c\uae4c….. 211.115.77.213 (daum \uc758 IP \uc8fc\uc18c). \uc774\uac83\ub3c4 \uc548\ub418\ub124??  \ubb34\uc2a8 \ubb38\uc81c\uac00 \uc788\ub098\ubcf4\ub2e4….\ub098\ub294 \ucc45\uc5d0 \ub098\uc628 \uc608\uc81c\ub97c \ub2e4\uc2dc \ud558\ub098\ud558\ub098 \ube44\uad50\ub97c \ud558\uba74\uc11c \ud639\uc2dc \uc788\uc744\uc9c0 \ubaa8\ub97c \ubbf8\uc2a4\ud0c0\uc774\ud551\uc744 \ucc3e\uc544\ubcf4\uc558\ub2e4. … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[40],"tags":[190,645,794],"_links":{"self":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/posts\/344"}],"collection":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=344"}],"version-history":[{"count":0,"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/posts\/344\/revisions"}],"wp:attachment":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=344"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=344"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=344"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}