{"id":393,"date":"2013-08-12T15:38:55","date_gmt":"2013-08-12T07:38:55","guid":{"rendered":"http:\/\/coderbee.net\/?p=393"},"modified":"2013-08-12T15:38:55","modified_gmt":"2013-08-12T07:38:55","slug":"tcpdump","status":"publish","type":"post","link":"https:\/\/coderbee.net\/index.php\/linux\/20130812\/393","title":{"rendered":"tcpdump"},"content":{"rendered":"<p>tcpdump\u662fLinux\u5185\u7f6e\u7684\u4e00\u4e2a\u6293\u5305\u5de5\u5177\uff0c\u7528\u4e8e\u5bf9\u7f51\u7edc\u4e0a\u7684\u6570\u636e\u5305\u8fdb\u884c\u622a\u83b7\u3001\u5206\u6790\u7684\u5de5\u5177\u3002<\/p>\n<h3>\u5b8c\u6574\u547d\u4ee4\u683c\u5f0f<\/h3>\n<pre>\n       tcpdump [ -AbdDefhHIJKlLnNOpqRStuUvxX ] [ -B buffer_size ] [ -c count ]\n               [ -C file_size ] [ -G rotate_seconds ] [ -F file ]\n               [ -i interface ] [ -j tstamp_type ] [ -m module ] [ -M secret ]\n               [ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n               [ -W filecount ]\n               [ -E spi@ipaddr algo:secret,...  ]\n               [ -y datalinktype ] [ -z postrotate-command ] [ -Z user ]\n               [ expression ]\n<\/pre>\n<p><!--more--><\/p>\n<h3>\u5e38\u7528\u9009\u9879<\/h3>\n<ul>\n<li><code>-A<\/code>\uff1a\u4ee5ASCII\u6253\u5370\u6bcf\u4e2a\u5305\uff08\u9664\u53bb\u94fe\u8def\u5c42\u7684\u5934\uff09\uff0c\u7528\u4e8eweb\u9875\u9762\u6293\u5305\u5f88\u65b9\u4fbf\u3002<\/li>\n<li><code>-B  buffer_size<\/code>\uff1a\u8bbe\u7f6e\u64cd\u4f5c\u7cfb\u7edf\u7528\u4e8e\u6293\u5305\u7684\u7f13\u5b58\u5927\u5c0f\u4e3abuffer_size\u3002<\/li>\n<li><code>-c  count<\/code>\uff1a\u5728\u63a5\u6536\u5230count\u4e2a\u5305\u540e\u9000\u51fa\u3002<\/li>\n<li><code>-C  file_size<\/code>\uff1a\u5728\u5199\u4e00\u4e2a\u539f\u59cb\u5305\u5230\u5b58\u50a8\u6587\u4ef6\u524d\uff0c\u5148\u68c0\u67e5\u5f53\u524d\u6587\u4ef6\u662f\u5426\u5927\u4e8e file_size\uff0c\u5982\u679c\u662f\uff0c\u5173\u95ed\u5f53\u524d\u5b58\u50a8\u6587\u4ef6\u5e76\u6253\u5f00\u4e00\u4e2a\u65b0\u7684\u3002\u7b2c\u4e00\u4e2a\u4e4b\u540e\u7684\u5b58\u50a8\u6587\u4ef6\u7684\u6587\u4ef6\u540d\u5c06\u4ee5 <code>-w<\/code> \u6807\u5fd7\u6307\u5b9a\u7684\u6587\u4ef6\u540d\u540e\u8ddf\u4e00\u4e2a\u6570\u5b57\uff0c\u5f00\u59cb\u4e8e1\uff0c\u6301\u7eed\u589e\u957f\u3002file_size\u7684\u5355\u4f4d\u662f\u767e\u4e07\u5b57\u8282\uff081000000\u5b57\u8282\uff0c\u800c\u4e0d\u662f 1048576\u5b57\u8282\uff09\u3002<\/li>\n<li><code>-D<\/code>\uff1a\u6253\u5370\u51fa\u7cfb\u7edf\u5f53\u524d\u53ef\u7528\u7684\u7f51\u7edc\u63a5\u53e3\uff0ctcpdump\u53ef\u7528\u8fdb\u884c\u6293\u5305\u7684\u3002<\/li>\n<li><code>-e<\/code>\uff1a\u5728\u6bcf\u4e00\u4e2a\u8f6c\u50a8\u884c\u6253\u5370\u94fe\u8def\u5c42\u7684\u5934\u3002<\/li>\n<li><code>-F expression-input-file<\/code>\uff1a\u4ece\u6307\u5b9a\u8f93\u5165\u6587\u4ef6\u8bfb\u53d6\u8fc7\u6ee4\u8868\u8fbe\u5f0f\u3002\u989d\u5916\u51fa\u73b0\u5728\u547d\u4ee4\u884c\u7684\u8868\u8fbe\u5f0f\u5c06\u88ab\u5ffd\u7565\u3002<\/li>\n<li><code>-i  interface<\/code>\uff1a\u76d1\u542c\u6307\u5b9a\u7f51\u7edc\u63a5\u53e3\u7684\u6570\u636e\u5305\u3002\u5982\u679c\u4e0d\u6307\u5b9a\uff0ctcpdump\u5c06\u641c\u7d22\u7cfb\u7edf\u7f51\u7edc\u63a5\u53e3\u5217\u8868\u7684\u7b2c\u4e00\u4e2a\u5df2\u914d\u7f6e\u63a5\u53e3\uff08\u6392\u9664\u56de\u73af\uff09\u3002<\/li>\n<li><code>-l<\/code>\uff1a\u7f13\u51b2\u6807\u51c6\u8f93\u51fa\u3002\u5728\u6355\u83b7\u7684\u540c\u65f6\u60f3\u67e5\u770b\u6570\u636e\u5f88\u6709\u7528\u3002\u5982\uff1a<code>tcpdump -l  |  tee  dat<\/code> \u6216 <code>tcpdump  -l  &gt;  dat &amp; tail -f  dat<\/code> \u3002<\/li>\n<li><code>-n<\/code>\uff1a\u4e0d\u8f6c\u6362\u5730\u5740\uff08\u5982 \u4e3b\u673a\u5730\u5740\uff0c\u7aef\u53e3\u53f7\u7b49\uff09\u5230\u540d\u5b57\u3002<\/li>\n<li><code>-t<\/code>\uff1a\u5728\u6bcf\u4e00\u4e2a\u8f6c\u50a8\u884c\u4e0a<strong>\u4e0d<\/strong>\u8f93\u51fa\u65f6\u95f4\u6233\u3002<\/li>\n<li><code>-w  output-file<\/code>\uff1a\u628a\u539f\u59cb\u5305\u5199\u5230\u8f93\u51fa\u6587\u4ef6\uff0c\u800c\u4e0d\u662f\u8fc7\u6ee4\u548c\u6253\u5370\uff08\u5230\u6807\u51c6\u8f93\u51fa\uff09\u3002\u5982\u679c\u8f93\u51fa\u6587\u4ef6\u4e3a <code>-<\/code> \u5219\u8f93\u51fa\u5230\u6807\u51c6\u8f93\u51fa\u3002<\/li>\n<li><code>-W  file-count<\/code>\uff1a\u4e0e <code>-C<\/code>\u9009\u9879\u4e00\u8d77\u65f6\uff0c\u7528\u4e8e\u9650\u5236\u6587\u4ef6\u7684\u6570\u91cf\u3002<\/li>\n<li><code>-x<\/code>\uff1a\u5728\u8fc7\u6ee4\u548c\u6253\u5370\u65f6\uff0c\u9664\u4e86\u6253\u5370\u6bcf\u4e2a\u5305\u7684\u5934\uff0c\u8fd8\u4ee5\u5341\u516d\u8fdb\u5236\u7684\u5f62\u5f0f\u6253\u5370\u6bcf\u4e2a\u5305\uff08\u51fa\u53bb\u94fe\u8def\u5c42\u7684\u5934\uff09\u7684\u6570\u636e\u3002<\/li>\n<li><code>-X<\/code>\uff1a\u5728\u8fc7\u6ee4\u548c\u6253\u5370\u65f6\uff0c\u9664\u4e86\u6253\u5370\u6bcf\u4e2a\u5305\u7684\u5934\uff0c\u8fd8\u4ee5\u5341\u516d\u8fdb\u5236\u548cASCII\u7684\u5f62\u5f0f\u6253\u5370\u6bcf\u4e2a\u5305\uff08\u51fa\u53bb\u94fe\u8def\u5c42\u7684\u5934\uff09\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n<h3>\u8868\u8fbe\u5f0f<\/h3>\n<p>\u8868\u8fbe\u5f0f\u7528\u4e8e\u9009\u62e9\u4ec0\u4e48\u5305\u624d\u88ab\u8f6c\u50a8\u3002\u5982\u679c\u6ca1\u6709\u7ed9\u51fa\u8868\u8fbe\u5f0f\uff0c\u6240\u6709\u5305\u90fd\u5c06\u88ab\u8f6c\u50a8\uff0c\u5426\u5219\uff0c\u53ea\u6709\u4f7f\u8868\u8fbe\u5f0f\u4e3a <code>true<\/code> \u7684\u5305\u624d\u88ab\u8f6c\u50a8\u3002<\/p>\n<h4>\u539f\u8bed\u548c\u539f\u8bed\u7ec4\u6210<\/h4>\n<p>\u8fc7\u6ee4\u8868\u8fbe\u5f0f\u5305\u542b\u4e00\u4e2a\u6216\u591a\u4e2a\u539f\u8bed\u3002\u539f\u8bed\u901a\u5e38\u5305\u542b\u4e00\u4e2a\u524d\u7f00\u6709\u4e00\u4e2a\u6216\u591a\u4e2a\u4fee\u9970\u7b26\u7684id\uff08\u540d\u5b57\u6216\u6570\u5b57\uff09\u3002\u6709\u4e09\u79cd\u4e0d\u540c\u7c7b\u578b\u7684\u4fee\u9970\u7b26\uff1a<\/p>\n<ul>\n<li>type \u7c7b\u578b\uff1a\u6b64\u7c7b\u4fee\u9970\u7b26\u662f\u8bf4\u660eid\u7684\u540d\u5b57\u6216\u6570\u5b57\u5f15\u7528\u7684\u4e8b\u60c5\u7c7b\u578b\u3002\u53ef\u9009\u7684\u7c7b\u578b\u6709\uff1a <code>host,  net,  port,  portrange<\/code>\u3002\u5982\uff0c <code>host  coderbee.net<\/code>\uff0c  <code>net  198.56.238.193<\/code>\uff0c  <code>port  80<\/code>\uff0c  <code>portrange  6000-9999<\/code>\u3002\u5982\u679c\u6ca1\u6709\u7c7b\u578b\u4fee\u9970\u7b26\uff0c\u9ed8\u8ba4\u662f <code>host<\/code>\u3002<\/p>\n<\/li>\n<li>\n<p>dir \u76ee\u5f55\uff1a\u6b64\u7c7b\u4fee\u9970\u7b26\u6307\u660e\u4e86\u4e00\u4e2a\u7279\u5b9a\u4f20\u8f93\u7684\u65b9\u5411\u662f  \u5230 \u548c\/\u6216 \u6765\u81ea  id\u3002\u53ef\u9009\u7684\u65b9\u5411\u6709 <code>src,  dst,  src  or  dst,  src and dst,  addr1,  addr2,  addr3,  addr4<\/code>\u3002\u5982\u679c\u6ca1\u6709\u6307\u5b9a\u76ee\u5f55\u4fee\u9970\u7b26\uff0c\u9ed8\u8ba4\u662f <code>src  or  dst<\/code>\u3002 <code>addr1,  addr2,  addr3,  addr4<\/code> \u53ea\u7528\u4e8eIEEE 802.11 \u65e0\u7ebfLAN\u94fe\u8def\u5c42\u3002<\/p>\n<\/li>\n<li>\n<p>proto \u534f\u8bae\uff1a\u6b64\u7c7b\u4fee\u9970\u7b26\u9650\u5b9a\u5339\u914d\u7279\u5b9a\u7684\u534f\u8bae\u3002\u53ef\u9009\u7684\u534f\u8bae\u6709 <code>ether,  fddi,  tr,  wlan,  ip,  ip6,  arp,  rarp,  decnet,  tcp  udp<\/code>\u3002\u4f8b\u5982\uff0c<code>tcp  port  80<\/code>\uff0c<code>udp  portrange  7000-9000<\/code>\uff0c <code>wlan  addr2  0:2:3:4:5:6<\/code>\u3002\u5982\u679c\u672a\u6307\u5b9a\u534f\u8bae\u4fee\u9970\u7b26\uff0c\u5c06\u5047\u8bbe\u662f\u6240\u6709\u4e0e \u7c7b\u578b \u4e00\u81f4\u7684\u534f\u8bae\u3002<\/p>\n<\/li>\n<\/ul>\n<h4>\u5173\u7cfb\u8fd0\u7b97<\/h4>\n<p>\u8868\u8fbe\u5f0f\u8fd8\u53ef\u4ee5\u8fdb\u884c\u5173\u7cfb\u8fd0\u7b97\uff1a <code>expr  relop  expr<\/code>\u3002<\/p>\n<p>repol \u53ef\u4ee5\u662f <code>&gt;,  &lt;,  &gt;=,  &lt;=,  =,  !=<\/code>\u4e2d\u7684\u4e00\u4e2a\uff0c expr\u662f\u7531\u6574\u5f62\u5e38\u91cf\u3001\u666e\u901a\u7684\u4e8c\u5143\u8fd0\u7b97\u7b26\uff08 <code>+,  -,  *,  \/,  &amp;,  |,  &lt;&lt;, &gt;&gt;<\/code>\uff09\u3001\u4e00\u4e2a\u957f\u5ea6\u64cd\u4f5c\u7b26\u548c\u7279\u5b9a\u7684\u5305\u6570\u636e\u8bbf\u95ee\u5668 \u7ec4\u6210\u7684\u6570\u503c\u8868\u8fbe\u5f0f\u3002\u6ce8\u610f\uff0c\u6240\u6709\u7684\u6bd4\u8f83\u90fd\u662f\u65e0\u7b26\u53f7\u7684\u3002<\/p>\n<p>\u4e3a\u8bbf\u95ee\u5305\u5185\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u7528\u8868\u8fbe\u5f0f\uff1a <code>proto[expr:size]<\/code> \u3002<\/p>\n<ul>\n<li>expr\uff0c\u662f\u5b57\u8282\u504f\u79fb\uff0c\u53d6\u51b3\u4e8e\u7ed9\u5b9a\u7684\u534f\u8bae\u5c42\u3002<\/li>\n<li>size\uff0c\u53ef\u9009\u7684\uff0c\u7528\u4e8e\u6307\u793a\u611f\u5174\u8da3\u5b57\u6bb5\u7684\u5b57\u8282\u6570\u91cf\uff0c\u53ef\u4ee5\u662f <code>1, 2, 4<\/code>\u3002\u9ed8\u8ba4\u662f 1\u3002<\/li>\n<\/ul>\n<p>\u957f\u5ea6\u64cd\u4f5c\u7b26\uff0c\u7528\u5173\u952e\u5b57 <code>len<\/code> \u8868\u793a\uff0c\u7ed9\u51fa\u5305\u7684\u957f\u5ea6\u3002<\/p>\n<h4>\u539f\u8bed\u64cd\u4f5c\u7b26<\/h4>\n<p>\u539f\u8bed\u8fd8\u53ef\u4ee5\u7531 \u4e00\u7ec4\u52a0\u62ec\u5f27\uff08\u5c0f\u62ec\u53f7\u5fc5\u987b\u8fdb\u884c\u8f6c\u4e49\uff09\u7684\u539f\u8bed\u548c\u64cd\u4f5c\u7b26\u7ec4\u6210\u3002<\/p>\n<ul>\n<li><code>!<\/code>  \u6216 <code>not<\/code> \u8868\u793a\u5426\u3002<\/li>\n<li><code>&amp;&amp;<\/code>  \u6216 <code>and<\/code>  \u8868\u793a\u8fde\u63a5\uff0c\u662f\u4e0e\u3002<\/li>\n<li><code>||<\/code>  \u6216  <code>or<\/code>  \u8868\u793a\u9009\u62e9\uff0c\u662f\u6216\u3002<\/li>\n<\/ul>\n<h3>\u4e3e\u4f8b<\/h3>\n<p>\u5728 venet0:0 \u7f51\u7edc\u63a5\u53e3 \u6293\u53d6 \u4e3b\u673a coderbee.net \u7684 80 \u7aef\u53e3\u7684\u5305\uff0c\u5e76\u4ee5ASCII\u7f16\u7801\u6253\u5370\u5305\u5185\u5bb9\uff1a <code>tcpdump  -A  host  coderbee.net  and  port  80  -i  venet0:0<\/code>\u3002<\/p>\n<p>\u76f4\u63a5\u5728\u7f51\u7edc\u4e0a\u4ee5\u5341\u516d\u8fdb\u5236\u548cACSII\u683c\u5f0f\u8f93\u51fa\u5305\uff1a <code>tcpdump host  coderbee.net  and  port  80  -i  venet0:0  -X<\/code>\u3002<\/p>\n<p>\u6293\u53d6HTTP\u62a5\u6587\uff1a <code>tcpdump  -XvvennSs 0 -i venet0:0 \u2013w filename tcp[20:2]=0x4745 or tcp[20:2]=0x4854<\/code> \u3002\u6d4b\u8bd5\u53d1\u73b0\u6ca1\u6293\u5230\u5305\u3002<\/p>\n<p>\u6293\u53d6\u6307\u5b9a\u4e3b\u673a\u4e4b\u95f4\u3001\u5e76\u6392\u9664\u7279\u5b9a\u4e3b\u673a\u7684\u5305\uff1a <code>tcpdump  host  coderbee.net  and  \\( 183.238.56.177  or  183.238.56.178 \\)  not  183.238.56.179<\/code>\u3002<\/p>\n<p>\u6253\u5370\u6bcf\u4e2aTCP\u4f1a\u8bdd\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u5305\uff0c\u5e76\u6392\u9664\u672c\u673a\u4e3b\u673a\uff1a<code>tcpdump  'tcp[tcpflags] &amp; (tcp-syn|tcp-fin) != 0 and not src and dst net  localnet'<\/code>\u3002<\/p>\n<p>\u6253\u5370\u6240\u6709IPv4\u3001\u53bb\u5f8080\u7aef\u53e3\u3001\u5305\u542b\u6570\u636e\u7684HTTP\u5305\uff0c <code>tcpdump  'tcp  dst  port 80 and (((ip[2:2] - ((ip[0]&amp;0xf)&lt;&lt;2)) - ((tcp[12]&amp;0xf0)&gt;&gt;2)) !=0)'  -Avv<\/code>\u3002<\/p>\n<p>tcpdump \u8981\u6c42\u5bf9IP\u3001TCP\u534f\u8bae\u719f\u6089\uff0c\u5bf9\u5177\u4f53\u7684\u5e27\u7684\u5c01\u88c5\u90fd\u8981\u6709\u6df1\u5165\u4e86\u89e3\uff0c\u96be\u5ea6\u8fd8\u662f\u633a\u5927\u7684\u3002\u7f51\u4e0a\u63d0\u5230\u7684\u4e00\u822c\u90fd\u662f\u7528tcpdump\u6293\u5305\uff0c\u518d\u7528wireshark\u8fdb\u884c\u5206\u6790\uff0c\u8fd9\u4e5f\u662f\u4e00\u4e2a\u9009\u62e9\u3002\u4e0d\u8fc7\u5bf9\u4e8e\u7b80\u5355\u7684HTTP\u62a5\u6587\u6293\u5305\u8fd8\u662f\u633a\u65b9\u4fbf\u7684\u3002<\/p>\n<hr\/>\n<p>\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u5fae\u4fe1\u516c\u4f17\u53f7: <strong>coderbee\u7b14\u8bb0<\/strong>\uff0c\u53ef\u4ee5\u66f4\u53ca\u65f6\u56de\u590d\u4f60\u7684\u8ba8\u8bba\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"258\" height=\"258\" src=\"https:\/\/coderbee.net\/wp-content\/uploads\/2019\/01\/coderbee-note.jpg\" class=\"alignnone size-full wp-image-1707\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>tcpdump\u662fLinux\u5185\u7f6e\u7684\u4e00\u4e2a\u6293\u5305\u5de5\u5177\uff0c\u7528\u4e8e\u5bf9\u7f51\u7edc\u4e0a\u7684\u6570\u636e\u5305\u8fdb\u884c\u622a\u83b7\u3001\u5206\u6790 &hellip; <a href=\"https:\/\/coderbee.net\/index.php\/linux\/20130812\/393\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[29],"_links":{"self":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/393"}],"collection":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/comments?post=393"}],"version-history":[{"count":5,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/393\/revisions"}],"predecessor-version":[{"id":398,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/393\/revisions\/398"}],"wp:attachment":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/media?parent=393"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/categories?post=393"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/tags?post=393"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}