{"id":214,"date":"2019-04-14T18:30:00","date_gmt":"2019-04-14T10:30:00","guid":{"rendered":"http:\/\/www.sinkland.cn\/?p=214"},"modified":"2019-08-23T21:37:26","modified_gmt":"2019-08-23T13:37:26","slug":"linux%e4%b8%8bping%e7%a8%8b%e5%ba%8f%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"http:\/\/www.sinkland.cn\/?p=214","title":{"rendered":"linux\u4e0bping\u7a0b\u5e8f\u5b9e\u73b0"},"content":{"rendered":"<p>\u8fd9\u91cc\u4f7f\u7528socket\u5b9e\u73b0ping\u7a0b\u5e8f\u7684\u6240\u6709\u529f\u80fd\u3002<\/p>\n<p>\u53ef\u4ee5\u501f\u6b64\u4e86\u89e3\u4ee5\u4e0bicmp\u534f\u8bae\u7684\u8bbe\u8ba1\u7ec6\u8282\u548c\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n<p>\u652f\u6301\u4ee5\u4e0b\u529f\u80fd:<\/p>\n<ul>\n<li>\u652f\u6301ping\u57df\u540d\u548cip\u5730\u5740<\/li>\n<li>\u652f\u6301\u81ea\u5b9a\u4e49\u53d1\u5305\u4e2a\u6570<\/li>\n<li>\u652f\u6301\u81ea\u5b9a\u4e49ttl<\/li>\n<li>\u652f\u6301\u8d85\u65f6\u8bbe\u5b9a<\/li>\n<\/ul>\n<h3>\u4f7f\u7528\u65b9\u6cd5:<\/h3>\n<pre><code class=\"language-c \">\/\/\u6253\u5370\u5e2e\u52a9\nLinux_ping -h\n\n\/\/\u53c2\u6570\u8bbe\u5b9a\nLinux_ping -c 10 -t 100 -w 100 ip\/\u57df\u540d\n<\/code><\/pre>\n<p>\u6765\u4ecb\u7ecd\u4e0b\u529f\u80fd\u5173\u952e\u70b9\uff1a<\/p>\n<h3>\u521b\u5efaICMP\u5957\u63a5\u5b57<\/h3>\n<pre><code class=\"language-c \">\/\/RAW\u5957\u63a5\u5b57,\u9700\u8981root\u6743\u9650\ng_sockfd=socket(AF_INET,SOCK_RAW,IPPROTO_ICMP);\n<\/code><\/pre>\n<h3>TTL\u8bbe\u5b9a<\/h3>\n<blockquote><p>\n  TTL(Time To Live)<\/p>\n<p>  \u8be5\u5b57\u6bb5\u6307\u5b9aIP\u5305\u88ab\u8def\u7531\u5668\u4e22\u5f03\u4e4b\u524d\u5141\u8bb8\u901a\u8fc7\u7684\u6700\u5927\u7f51\u6bb5\u6570\u91cf<\/p>\n<p>  \u5982\u679c\u8bbe\u7f6e\u7684ttl\u8fc7\u5c0f\uff0c\u90a3\u4e48\u5c31\u5c31\u4f1a\u6536\u4e0d\u5230\u56de\u5305\n<\/p><\/blockquote>\n<pre><code class=\"language-c \">UINT32 ttl = TTL;\nsetsockopt(g_sockfd, IPPROTO_IP, IP_TTL, (char *)&amp;ttl, sizeof(ttl)); \n<\/code><\/pre>\n<h3>\u57df\u540d\u5230IP\u7684\u8f6c\u6362<\/h3>\n<pre><code class=\"language-c \">\/\/\u662f\u4e3b\u673a\u540d\nif (inet_addr(szHost) == INADDR_NONE)\n{\n        host = gethostbyname(szHost);\n        if(host==NULL)\n        {\n            perror(\"\u83b7\u53d6\u4e3b\u673a\u540d\u9519\u8bef\");\n            return -1;\n        }\n        \/\/\u6210\u529f\u7684\u8bdd\uff0cip\u5730\u5740\u5b58\u5728host\u91cc\u9762\n}\n<\/code><\/pre>\n<h3>\u5b57\u7b26\u4e32\u5230IP\u7684\u8f6c\u6362<\/h3>\n<pre><code class=\"language-c \">dest_addr.sin_addr.s_addr = inet_addr(szHost);\nprintf(\"IP:%s\\n\", inet_ntoa(g_dest_addr.sin_addr));\n<\/code><\/pre>\n<h3>\u7f51\u7edc\u5b57\u8282\u5e8f<\/h3>\n<blockquote><p>\n  \u7f51\u7edc\u5b57\u8282\u5e8f\u662f\u5927\u7aef<\/p>\n<p>  X86\u4f53\u7cfb\u662f\u5c0f\u7aef\u5b57\u8282\u5e8f\uff0c\u4e00\u822c\u90fd\u9700\u8981\u81ea\u884c\u8f6c\u6362\u5b57\u8282\u5e8f\n<\/p><\/blockquote>\n<p>\u4ee5\u4e0b\u5e38\u7528\u51fd\u6570\u7528\u4e8e\u5b57\u8282\u5e8f\u8f6c\u6362:<\/p>\n<pre><code class=\"language-c \">\/\/\u4e3b\u673a\u5e8f-&gt;\u7f51\u7edc\u5e8f\nhtonl()\n\/\/\u7f51\u7edc\u5e8f-&gt;\u4e3b\u673a\u5e8f\nntohl()\n<\/code><\/pre>\n<h3>\u81ea\u5b9a\u4e49ICMP\u62a5\u5934<\/h3>\n<pre><code class=\"language-c \">\/\/\u7c7b\u578b\nicmp-&gt;icmp_type = ICMP_ECHO;\nicmp-&gt;icmp_code = 0;\n\/\/\u6821\u9a8c\u7801,\u5fc5\u987b\u9ed8\u8ba4\u7f6e0\nicmp-&gt;icmp_cksum = 0;\nicmp-&gt;icmp_seq = pack_no;\nicmp-&gt;icmp_id=pid;\n\n\/\/\u5934\u90e88\u4e2a\u5b57\u8282\npacksize = 8 + g_datalen;\nicmp-&gt;icmp_cksum=cal_chksum((unsigned short *)icmp, packsize);\n<\/code><\/pre>\n<h3>\u4f7f\u7528alarm()\u8bbe\u7f6e\u8d85\u65f6<\/h3>\n<blockquote><p>\n  alarm()\u4e3b\u8981\u529f\u80fd: \u8bbe\u7f6e\u4fe1\u53f7\u4f20\u9001\u95f9\u949f<\/p>\n<p>  \u5373\u7528\u6765\u8bbe\u7f6e\u4fe1\u53f7SIGALRM\u5728\u7ecf\u8fc7\u53c2\u6570seconds\u79d2\u6570\u540e\u53d1\u9001\u7ed9\u76ee\u524d\u7684\u8fdb\u7a0b<\/p>\n<p>  \u679c\u5728seconds\u79d2\u5185\u518d\u6b21\u8c03\u7528\u4e86alarm\u51fd\u6570\u5219\u540e\u9762\u5b9a\u65f6\u5668\u7684\u8bbe\u7f6e\u5c06\u8986\u76d6\u524d\u9762\u7684\u8bbe\u7f6e\n<\/p><\/blockquote>\n<p>\u4e3b\u8981\u903b\u8f91:<\/p>\n<pre><code class=\"language-c \">signal(SIGALRM,Statistic);\n\nwhile(g_nRecv &lt; g_nNeedSend)\n{\n    alarm(g_nWait);\n    recvfrom(g_sockfd, g_RecvPacket, sizeof(g_RecvPacket), 0, (struct sockaddr *)&amp;g_from,&amp;nfromlen);\n}\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u4f7f\u7528\u4e86\u963b\u585erecvfrom(),\u5982\u679c\u63a5\u6536\u8d85\u65f6\u4f1a\u89e6\u53d1\u6211\u4eec\u8bbe\u7f6e\u7684signal\u51fd\u6570<\/p>\n<p>\u8fd0\u884c\u7ed3\u679c\uff1a<br \/>\n<img decoding=\"async\" src=\"http:\/\/pic.sinkland.cn\/linux_ping.png\" alt=\"image\" \/><\/p>\n<p>github\uff1a<br \/>\n<a href=\"https:\/\/github.com\/daterlove\/Linux-Ping\">https:\/\/github.com\/daterlove\/Linux-Ping<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u91cc\u4f7f\u7528socket\u5b9e\u73b0ping\u7a0b\u5e8f\u7684\u6240\u6709\u529f\u80fd\u3002 \u53ef\u4ee5\u501f\u6b64\u4e86\u89e3\u4ee5\u4e0bicmp\u534f\u8bae\u7684\u8bbe\u8ba1\u7ec6\u8282\u548c\u6ce8\u610f\u4e8b\u9879\u3002 \u652f\u6301\u4ee5\u4e0b [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"_links":{"self":[{"href":"http:\/\/www.sinkland.cn\/index.php?rest_route=\/wp\/v2\/posts\/214"}],"collection":[{"href":"http:\/\/www.sinkland.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.sinkland.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.sinkland.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.sinkland.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=214"}],"version-history":[{"count":2,"href":"http:\/\/www.sinkland.cn\/index.php?rest_route=\/wp\/v2\/posts\/214\/revisions"}],"predecessor-version":[{"id":216,"href":"http:\/\/www.sinkland.cn\/index.php?rest_route=\/wp\/v2\/posts\/214\/revisions\/216"}],"wp:attachment":[{"href":"http:\/\/www.sinkland.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.sinkland.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=214"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.sinkland.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}