{"id":3328,"date":"2017-06-06T19:33:32","date_gmt":"2017-06-06T11:33:32","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=3328"},"modified":"2017-06-06T19:33:32","modified_gmt":"2017-06-06T11:33:32","slug":"linux%e4%b8%8b%e7%94%a8c%e8%af%ad%e8%a8%80%e5%ae%9e%e7%8e%b0%e8%8e%b7%e5%8f%96%e6%9c%ba%e5%99%a8iphostname","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/3328.html","title":{"rendered":"Linux\u4e0b\u7528C\u8bed\u8a00\u5b9e\u73b0#\u83b7\u53d6\u673a\u5668IP\/HOSTNAME"},"content":{"rendered":"<p>=Start=<\/p>\n<h4 id=\"Linux\u4e0b\u5982\u4f55\u7528C\u7f16\u7a0b\u83b7\u53d6\u670d\u52a1\u5668\u7684\u7f51\u5361\/IP\/HOSTNAME\u7b49\u4fe1\u606f-\u7f18\u7531\uff1a\">\u7f18\u7531\uff1a<\/h4>\n<p>\u4fe1\u606f\u6536\u96c6\u9700\u8981\uff1aIP\/HOSTNAME<\/p>\n<h4 id=\"Linux\u4e0b\u5982\u4f55\u7528C\u7f16\u7a0b\u83b7\u53d6\u670d\u52a1\u5668\u7684\u7f51\u5361\/IP\/HOSTNAME\u7b49\u4fe1\u606f-\u6b63\u6587\uff1a\">\u6b63\u6587\uff1a<\/h4>\n<h5 id=\"Linux\u4e0b\u5982\u4f55\u7528C\u7f16\u7a0b\u83b7\u53d6\u670d\u52a1\u5668\u7684\u7f51\u5361\/IP\/HOSTNAME\u7b49\u4fe1\u606f-\u53c2\u8003\u89e3\u7b54\uff1a\">\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n<p>HOSTNAME\u7684\u83b7\u53d6<\/p>\n<ul>\n<li><a class=\"external-link\" href=\"https:\/\/stackoverflow.com\/questions\/5190553\/linux-c-get-server-hostname\" rel=\"nofollow\">https:\/\/stackoverflow.com\/questions\/5190553\/linux-c-get-server-hostname<\/a><\/li>\n<li><a class=\"external-link\" href=\"https:\/\/linux.die.net\/man\/2\/gethostname\" rel=\"nofollow\">https:\/\/linux.die.net\/man\/2\/gethostname<\/a><\/li>\n<\/ul>\n<div class=\"code panel pdl conf-macro output-block\" data-hasbody=\"true\" data-macro-name=\"code\">\n<div class=\"codeContent panelContent pdl\">\n<div>\n<div id=\"highlighter_999474\" class=\"syntaxhighlighter sh-confluence nogutter java\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"code\">\n<div class=\"container\" title=\"Hint: double-click to select code\">\n<div class=\"line number1 index0 alt2\"><code class=\"java plain\">#include &lt;stdio.h&gt;<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java plain\">#include &lt;stdlib.h&gt;<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java plain\">#include &lt;unistd.h&gt;<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"java keyword\">int<\/code> <code class=\"java plain\">main(<\/code><code class=\"java keyword\">void<\/code><code class=\"java plain\">) {<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">char<\/code> <code class=\"java plain\">hostname[<\/code><code class=\"java value\">1024<\/code><code class=\"java plain\">];<\/code><\/div>\n<div class=\"line number7 index6 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">gethostname(hostname, <\/code><code class=\"java value\">1024<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">puts(hostname);<\/code><\/div>\n<div class=\"line number9 index8 alt2\"><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">return<\/code> <code class=\"java plain\">EXIT_SUCCESS;<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java plain\">}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>IP\u7684\u83b7\u53d6<\/p>\n<ul>\n<li><a class=\"external-link\" href=\"https:\/\/stackoverflow.com\/questions\/2283494\/get-ip-address-of-an-interface-on-linux\" rel=\"nofollow\">https:\/\/stackoverflow.com\/questions\/2283494\/get-ip-address-of-an-interface-on-linux<\/a><\/li>\n<li><a class=\"external-link\" href=\"http:\/\/man7.org\/linux\/man-pages\/man3\/getifaddrs.3.html\" rel=\"nofollow\">http:\/\/man7.org\/linux\/man-pages\/man3\/getifaddrs.3.html<\/a><\/li>\n<li><a class=\"external-link\" href=\"http:\/\/www.binarytides.com\/get-local-ip-c-linux\/\" rel=\"nofollow\">http:\/\/www.binarytides.com\/get-local-ip-c-linux\/<\/a><\/li>\n<li><a class=\"external-link\" href=\"http:\/\/www.binarytides.com\/c-program-to-get-ip-address-from-interface-name-on-linux\/\" rel=\"nofollow\">http:\/\/www.binarytides.com\/c-program-to-get-ip-address-from-interface-name-on-linux\/<\/a><\/li>\n<\/ul>\n<div class=\"code panel pdl conf-macro output-block\" data-hasbody=\"true\" data-macro-name=\"code\">\n<div class=\"codeContent panelContent pdl\">\n<div>\n<div id=\"highlighter_647148\" class=\"syntaxhighlighter sh-confluence nogutter java\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"code\">\n<div class=\"container\" title=\"Hint: double-click to select code\">\n<div class=\"line number1 index0 alt2\"><code class=\"java comments\">\/*<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java spaces\">\u00a0<\/code><code class=\"java comments\">* Find local ip used as source ip in ip packets.<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java spaces\">\u00a0<\/code><code class=\"java comments\">* Read the \/proc\/net\/route file<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java spaces\">\u00a0<\/code><code class=\"java comments\">*\/<\/code><\/div>\n<div class=\"line number5 index4 alt2\"><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java plain\">#include &lt;stdio.h&gt; <\/code><code class=\"java comments\">\/\/printf<\/code><\/div>\n<div class=\"line number7 index6 alt2\"><code class=\"java plain\">#include &lt;string.h&gt; <\/code><code class=\"java comments\">\/\/memset<\/code><\/div>\n<div class=\"line number8 index7 alt1\"><code class=\"java plain\">#include &lt;errno.h&gt; <\/code><code class=\"java comments\">\/\/errno<\/code><\/div>\n<div class=\"line number9 index8 alt2\"><code class=\"java plain\">#include &lt;sys\/socket.h&gt;<\/code><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java plain\">#include &lt;netdb.h&gt;<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java plain\">#include &lt;ifaddrs.h&gt;<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java plain\">#include &lt;stdlib.h&gt;<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"java plain\">#include &lt;unistd.h&gt;<\/code><\/div>\n<div class=\"line number14 index13 alt1\"><\/div>\n<div class=\"line number15 index14 alt2\"><code class=\"java keyword\">int<\/code> <code class=\"java plain\">main ( <\/code><code class=\"java keyword\">int<\/code> <code class=\"java plain\">argc , <\/code><code class=\"java keyword\">char<\/code> <code class=\"java plain\">*argv[] )<\/code><\/div>\n<div class=\"line number16 index15 alt1\"><code class=\"java plain\">{<\/code><\/div>\n<div class=\"line number17 index16 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">FILE *f;<\/code><\/div>\n<div class=\"line number18 index17 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">char<\/code> <code class=\"java plain\">line[<\/code><code class=\"java value\">100<\/code><code class=\"java plain\">] , *p , *c;<\/code><\/div>\n<div class=\"line number19 index18 alt2\"><\/div>\n<div class=\"line number20 index19 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">f = fopen(<\/code><code class=\"java string\">\"\/proc\/net\/route\"<\/code> <code class=\"java plain\">, <\/code><code class=\"java string\">\"r\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number21 index20 alt2\"><\/div>\n<div class=\"line number22 index21 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">while<\/code><code class=\"java plain\">(fgets(line , <\/code><code class=\"java value\">100<\/code> <code class=\"java plain\">, f))<\/code><\/div>\n<div class=\"line number23 index22 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">{<\/code><\/div>\n<div class=\"line number24 index23 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">p = strtok(line , <\/code><code class=\"java string\">\" \\t\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number25 index24 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">c = strtok(NULL , <\/code><code class=\"java string\">\" \\t\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number26 index25 alt1\"><\/div>\n<div class=\"line number27 index26 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">if<\/code><code class=\"java plain\">(p!=NULL &amp;&amp; c!=NULL)<\/code><\/div>\n<div class=\"line number28 index27 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">{<\/code><\/div>\n<div class=\"line number29 index28 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">if<\/code><code class=\"java plain\">(strcmp(c , <\/code><code class=\"java string\">\"00000000\"<\/code><code class=\"java plain\">) == <\/code><code class=\"java value\">0<\/code><code class=\"java plain\">)<\/code><\/div>\n<div class=\"line number30 index29 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">{<\/code><\/div>\n<div class=\"line number31 index30 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">printf(<\/code><code class=\"java string\">\"Default interface is : %s \\n\"<\/code> <code class=\"java plain\">, p);<\/code><\/div>\n<div class=\"line number32 index31 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">break<\/code><code class=\"java plain\">;<\/code><\/div>\n<div class=\"line number33 index32 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number34 index33 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number35 index34 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number36 index35 alt1\"><\/div>\n<div class=\"line number37 index36 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java comments\">\/\/which family do we require , AF_INET or AF_INET6<\/code><\/div>\n<div class=\"line number38 index37 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">int<\/code> <code class=\"java plain\">fm = AF_INET;<\/code><\/div>\n<div class=\"line number39 index38 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">struct ifaddrs *ifaddr, *ifa;<\/code><\/div>\n<div class=\"line number40 index39 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">int<\/code> <code class=\"java plain\">family , s;<\/code><\/div>\n<div class=\"line number41 index40 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">char<\/code> <code class=\"java plain\">host[NI_MAXHOST];<\/code><\/div>\n<div class=\"line number42 index41 alt1\"><\/div>\n<div class=\"line number43 index42 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">if<\/code> <code class=\"java plain\">(getifaddrs(&amp;ifaddr) == -<\/code><code class=\"java value\">1<\/code><code class=\"java plain\">)<\/code><\/div>\n<div class=\"line number44 index43 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">{<\/code><\/div>\n<div class=\"line number45 index44 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">perror(<\/code><code class=\"java string\">\"getifaddrs\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number46 index45 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">exit(EXIT_FAILURE);<\/code><\/div>\n<div class=\"line number47 index46 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number48 index47 alt1\"><\/div>\n<div class=\"line number49 index48 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java comments\">\/\/Walk through linked list, maintaining head pointer so we can free list later<\/code><\/div>\n<div class=\"line number50 index49 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">for<\/code> <code class=\"java plain\">(ifa = ifaddr; ifa != NULL; ifa = ifa-&gt;ifa_next)<\/code><\/div>\n<div class=\"line number51 index50 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">{<\/code><\/div>\n<div class=\"line number52 index51 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">if<\/code> <code class=\"java plain\">(ifa-&gt;ifa_addr == NULL)<\/code><\/div>\n<div class=\"line number53 index52 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">{<\/code><\/div>\n<div class=\"line number54 index53 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">continue<\/code><code class=\"java plain\">;<\/code><\/div>\n<div class=\"line number55 index54 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number56 index55 alt1\"><\/div>\n<div class=\"line number57 index56 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">family = ifa-&gt;ifa_addr-&gt;sa_family;<\/code><\/div>\n<div class=\"line number58 index57 alt1\"><\/div>\n<div class=\"line number59 index58 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">if<\/code><code class=\"java plain\">(strcmp( ifa-&gt;ifa_name , p) == <\/code><code class=\"java value\">0<\/code><code class=\"java plain\">)<\/code><\/div>\n<div class=\"line number60 index59 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">{<\/code><\/div>\n<div class=\"line number61 index60 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">if<\/code> <code class=\"java plain\">(family == fm)<\/code><\/div>\n<div class=\"line number62 index61 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">{<\/code><\/div>\n<div class=\"line number63 index62 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">s = getnameinfo( ifa-&gt;ifa_addr, (family == AF_INET) ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6) , host , NI_MAXHOST , NULL , <\/code><code class=\"java value\">0<\/code> <code class=\"java plain\">, NI_NUMERICHOST);<\/code><\/div>\n<div class=\"line number64 index63 alt1\"><\/div>\n<div class=\"line number65 index64 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">if<\/code> <code class=\"java plain\">(s != <\/code><code class=\"java value\">0<\/code><code class=\"java plain\">)<\/code><\/div>\n<div class=\"line number66 index65 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">{<\/code><\/div>\n<div class=\"line number67 index66 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">printf(<\/code><code class=\"java string\">\"getnameinfo() failed: %s\\n\"<\/code><code class=\"java plain\">, gai_strerror(s));<\/code><\/div>\n<div class=\"line number68 index67 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">exit(EXIT_FAILURE);<\/code><\/div>\n<div class=\"line number69 index68 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number70 index69 alt1\"><\/div>\n<div class=\"line number71 index70 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">printf(<\/code><code class=\"java string\">\"address: %s\"<\/code><code class=\"java plain\">, host);<\/code><\/div>\n<div class=\"line number72 index71 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number73 index72 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">printf(<\/code><code class=\"java string\">\"\\n\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number74 index73 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number75 index74 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number76 index75 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">freeifaddrs(ifaddr);<\/code><\/div>\n<div class=\"line number77 index76 alt2\"><\/div>\n<div class=\"line number78 index77 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">return<\/code> <code class=\"java value\">0<\/code><code class=\"java plain\">;<\/code><\/div>\n<div class=\"line number79 index78 alt2\"><code class=\"java plain\">}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>&amp;<\/p>\n<ul>\n<li><a class=\"external-link\" href=\"https:\/\/stackoverflow.com\/questions\/2021549\/how-do-i-output-my-host-s-ip-addresses-from-a-c-program\" rel=\"nofollow\">https:\/\/stackoverflow.com\/questions\/2021549\/how-do-i-output-my-host-s-ip-addresses-from-a-c-program<\/a><\/li>\n<\/ul>\n<div class=\"code panel pdl conf-macro output-block\" data-hasbody=\"true\" data-macro-name=\"code\">\n<div class=\"codeContent panelContent pdl\">\n<div>\n<div id=\"highlighter_728759\" class=\"syntaxhighlighter sh-confluence nogutter java\">\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td class=\"code\">\n<div class=\"container\" title=\"Hint: double-click to select code\">\n<div class=\"line number1 index0 alt2\"><code class=\"java plain\">#include &lt;stdio.h&gt;<\/code><\/div>\n<div class=\"line number2 index1 alt1\"><code class=\"java plain\">#include &lt;sys\/socket.h&gt;<\/code><\/div>\n<div class=\"line number3 index2 alt2\"><code class=\"java plain\">#include &lt;sys\/ioctl.h&gt;<\/code><\/div>\n<div class=\"line number4 index3 alt1\"><code class=\"java plain\">#include &lt;linux\/netdevice.h&gt;<\/code><\/div>\n<div class=\"line number5 index4 alt2\"><code class=\"java plain\">#include &lt;arpa\/inet.h&gt;<\/code><\/div>\n<div class=\"line number6 index5 alt1\"><code class=\"java plain\">#include &lt;netinet\/in.h&gt;<\/code><\/div>\n<div class=\"line number7 index6 alt2\"><code class=\"java plain\">#include &lt;unistd.h&gt;<\/code><\/div>\n<div class=\"line number8 index7 alt1\"><\/div>\n<div class=\"line number9 index8 alt2\"><code class=\"java keyword\">int<\/code> <code class=\"java plain\">print_addresses(<\/code><code class=\"java keyword\">const<\/code> <code class=\"java keyword\">int<\/code> <code class=\"java plain\">domain)<\/code><\/div>\n<div class=\"line number10 index9 alt1\"><code class=\"java plain\">{<\/code><\/div>\n<div class=\"line number11 index10 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">int<\/code> <code class=\"java plain\">s;<\/code><\/div>\n<div class=\"line number12 index11 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">struct ifconf ifconf;<\/code><\/div>\n<div class=\"line number13 index12 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">struct ifreq ifr[<\/code><code class=\"java value\">50<\/code><code class=\"java plain\">];<\/code><\/div>\n<div class=\"line number14 index13 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">int<\/code> <code class=\"java plain\">ifs;<\/code><\/div>\n<div class=\"line number15 index14 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">int<\/code> <code class=\"java plain\">i;<\/code><\/div>\n<div class=\"line number16 index15 alt1\"><\/div>\n<div class=\"line number17 index16 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">s = socket(domain, SOCK_STREAM, <\/code><code class=\"java value\">0<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number18 index17 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">if<\/code> <code class=\"java plain\">(s &lt; <\/code><code class=\"java value\">0<\/code><code class=\"java plain\">) {<\/code><\/div>\n<div class=\"line number19 index18 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">perror(<\/code><code class=\"java string\">\"socket\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number20 index19 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">return<\/code> <code class=\"java value\">0<\/code><code class=\"java plain\">;<\/code><\/div>\n<div class=\"line number21 index20 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number22 index21 alt1\"><\/div>\n<div class=\"line number23 index22 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">ifconf.ifc_buf = (<\/code><code class=\"java keyword\">char<\/code> <code class=\"java plain\">*) ifr;<\/code><\/div>\n<div class=\"line number24 index23 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">ifconf.ifc_len = sizeof ifr;<\/code><\/div>\n<div class=\"line number25 index24 alt2\"><\/div>\n<div class=\"line number26 index25 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">if<\/code> <code class=\"java plain\">(ioctl(s, SIOCGIFCONF, &amp;ifconf) == -<\/code><code class=\"java value\">1<\/code><code class=\"java plain\">) {<\/code><\/div>\n<div class=\"line number27 index26 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">perror(<\/code><code class=\"java string\">\"ioctl\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number28 index27 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">return<\/code> <code class=\"java value\">0<\/code><code class=\"java plain\">;<\/code><\/div>\n<div class=\"line number29 index28 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number30 index29 alt1\"><\/div>\n<div class=\"line number31 index30 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">ifs = ifconf.ifc_len \/ sizeof(ifr[<\/code><code class=\"java value\">0<\/code><code class=\"java plain\">]);<\/code><\/div>\n<div class=\"line number32 index31 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">printf(<\/code><code class=\"java string\">\"interfaces = %d:\\n\"<\/code><code class=\"java plain\">, ifs);<\/code><\/div>\n<div class=\"line number33 index32 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">for<\/code> <code class=\"java plain\">(i = <\/code><code class=\"java value\">0<\/code><code class=\"java plain\">; i &lt; ifs; i++) {<\/code><\/div>\n<div class=\"line number34 index33 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">char<\/code> <code class=\"java plain\">ip[INET_ADDRSTRLEN];<\/code><\/div>\n<div class=\"line number35 index34 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">struct sockaddr_in *s_in = (struct sockaddr_in *) &amp;ifr[i].ifr_addr;<\/code><\/div>\n<div class=\"line number36 index35 alt1\"><\/div>\n<div class=\"line number37 index36 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">if<\/code> <code class=\"java plain\">(!inet_ntop(domain, &amp;s_in-&gt;sin_addr, ip, sizeof(ip))) {<\/code><\/div>\n<div class=\"line number38 index37 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">perror(<\/code><code class=\"java string\">\"inet_ntop\"<\/code><code class=\"java plain\">);<\/code><\/div>\n<div class=\"line number39 index38 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">return<\/code> <code class=\"java value\">0<\/code><code class=\"java plain\">;<\/code><\/div>\n<div class=\"line number40 index39 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number41 index40 alt2\"><\/div>\n<div class=\"line number42 index41 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java plain\">printf(<\/code><code class=\"java string\">\"%s - %s\\n\"<\/code><code class=\"java plain\">, ifr[i].ifr_name, ip);<\/code><\/div>\n<div class=\"line number43 index42 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number44 index43 alt1\"><\/div>\n<div class=\"line number45 index44 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java plain\">close(s);<\/code><\/div>\n<div class=\"line number46 index45 alt1\"><\/div>\n<div class=\"line number47 index46 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">return<\/code> <code class=\"java value\">1<\/code><code class=\"java plain\">;<\/code><\/div>\n<div class=\"line number48 index47 alt1\"><code class=\"java plain\">}<\/code><\/div>\n<div class=\"line number49 index48 alt2\"><\/div>\n<div class=\"line number50 index49 alt1\"><code class=\"java keyword\">int<\/code> <code class=\"java plain\">main(<\/code><code class=\"java keyword\">int<\/code> <code class=\"java plain\">argc, <\/code><code class=\"java keyword\">char<\/code> <code class=\"java plain\">*argv[])<\/code><\/div>\n<div class=\"line number51 index50 alt2\"><code class=\"java plain\">{<\/code><\/div>\n<div class=\"line number52 index51 alt1\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">int<\/code> <code class=\"java plain\">domains[] = { AF_INET, AF_INET6 };<\/code><\/div>\n<div class=\"line number53 index52 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">int<\/code> <code class=\"java plain\">i;<\/code><\/div>\n<div class=\"line number54 index53 alt1\"><\/div>\n<div class=\"line number55 index54 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">for<\/code> <code class=\"java plain\">(i = <\/code><code class=\"java value\">0<\/code><code class=\"java plain\">; i &lt; sizeof(domains) \/ sizeof(domains[<\/code><code class=\"java value\">0<\/code><code class=\"java plain\">]); i++)<\/code><\/div>\n<div class=\"line number56 index55 alt1\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">if<\/code> <code class=\"java plain\">(!print_addresses(domains[i]))<\/code><\/div>\n<div class=\"line number57 index56 alt2\"><code class=\"java spaces\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code><code class=\"java keyword\">return<\/code> <code class=\"java value\">1<\/code><code class=\"java plain\">;<\/code><\/div>\n<div class=\"line number58 index57 alt1\"><\/div>\n<div class=\"line number59 index58 alt2\"><code class=\"java spaces\">\u00a0\u00a0<\/code><code class=\"java keyword\">return<\/code> <code class=\"java value\">0<\/code><code class=\"java plain\">;<\/code><\/div>\n<div class=\"line number60 index59 alt1\"><code class=\"java plain\">}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>=END=<\/p>\n","protected":false},"excerpt":{"rendered":"<p>=Start= \u7f18\u7531\uff1a \u4fe1\u606f\u6536\u96c6\u9700\u8981\uff1aIP\/HOSTNAME \u6b63\u6587\uff1a \u53c2\u8003\u89e3\u7b54\uff1a HOSTNAME\u7684\u83b7\u53d6 ht [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,11,7],"tags":[589,100,801,30],"class_list":["post-3328","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-linux","category-programing","tag-proc","tag-c","tag-gethostname","tag-linux"],"views":6336,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3328","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=3328"}],"version-history":[{"count":1,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3328\/revisions"}],"predecessor-version":[{"id":3329,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3328\/revisions\/3329"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=3328"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=3328"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=3328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}