{"id":92,"date":"2015-12-15T09:18:22","date_gmt":"2015-12-15T01:18:22","guid":{"rendered":"https:\/\/blog.espnlol.com\/?p=92"},"modified":"2015-12-15T09:47:49","modified_gmt":"2015-12-15T01:47:49","slug":"tcpdump%e5%bf%ab%e9%80%9f%e5%85%a5%e9%97%a8%ef%bc%8c%e5%b8%b8%e7%94%a8%e5%ae%9e%e4%be%8b","status":"publish","type":"post","link":"https:\/\/blog.espnlol.com\/?p=92","title":{"rendered":"tcpdump\u5feb\u901f\u5165\u95e8\uff0c\u5e38\u7528\u5b9e\u4f8b"},"content":{"rendered":"

\u57fa\u672c\u8bed\u6cd5<\/p>\n

========
\n\u8fc7\u6ee4\u4e3b\u673a
\n——–
\n– \u6293\u53d6\u6240\u6709\u7ecf\u8fc7 eth1\uff0c\u76ee\u7684\u6216\u6e90\u5730\u5740\u662f 192.168.1.1 \u7684\u7f51\u7edc\u6570\u636e<\/p>\n

tcpdump -i eth1 host 192.168.1.1<\/pre>\n
– \u6e90\u5730\u5740<\/p>\n
tcpdump -i eth1 src host 192.168.1.1<\/pre>\n
– \u76ee\u7684\u5730\u5740<\/p>\n
tcpdump -i eth1 dst host 192.168.1.1<\/pre>\n
\u8fc7\u6ee4\u7aef\u53e3
\n——–
\n– \u6293\u53d6\u6240\u6709\u7ecf\u8fc7 eth1\uff0c\u76ee\u7684\u6216\u6e90\u7aef\u53e3\u662f 25 \u7684\u7f51\u7edc\u6570\u636e<\/p>\n
tcpdump -i eth1 port 25<\/pre>\n
– \u6e90\u7aef\u53e3<\/p>\n
tcpdump -i eth1 src port 25<\/pre>\n
– \u76ee\u7684\u7aef\u53e3<\/p>\n
tcpdump -i eth1 dst port 25 \u00a0\u7f51\u7edc\u8fc7\u6ee4<\/pre>\n
——–<\/p>\n
tcpdump -i eth1 net 192.168\r\ntcpdump -i eth1 src net 192.168\r\ntcpdump -i eth1 dst net 192.168<\/pre>\n
\u534f\u8bae\u8fc7\u6ee4
\n——–<\/p>\n
tcpdump -i eth1 arp\r\ntcpdump -i eth1 ip\r\ntcpdump -i eth1 tcp\r\ntcpdump -i eth1 udp\r\ntcpdump -i eth1 icmp<\/pre>\n
\u5e38\u7528\u8868\u8fbe\u5f0f
\n———-
\n\u975e : ! or “not” (\u53bb\u6389\u53cc\u5f15\u53f7)
\n\u4e14 : && or “and”
\n\u6216 : || or “or”
\n– \u6293\u53d6\u6240\u6709\u7ecf\u8fc7 eth1\uff0c\u76ee\u7684\u5730\u5740\u662f 192.168.1.254 \u6216 192.168.1.200 \u7aef\u53e3\u662f 80 \u7684 TCP \u6570\u636e<\/p>\n
tcpdump -i eth1 '((tcp) and (port 80) and ((dst host 192.168.1.254) or (dst host\r\n192.168.1.200)))'<\/pre>\n
– \u6293\u53d6\u6240\u6709\u7ecf\u8fc7 eth1\uff0c\u76ee\u6807 MAC \u5730\u5740\u662f 00:01:02:03:04:05 \u7684 ICMP \u6570\u636e<\/p>\n
tcpdump -i eth1 '((icmp) and ((ether dst host 00:01:02:03:04:05)))'<\/pre>\n
– \u6293\u53d6\u6240\u6709\u7ecf\u8fc7 eth1\uff0c\u76ee\u7684\u7f51\u7edc\u662f 192.168\uff0c\u4f46\u76ee\u7684\u4e3b\u673a\u4e0d\u662f 192.168.1.200 \u7684 TCP \u6570\u636e<\/p>\n
tcpdump -i eth1 '((tcp) and ((dst net 192.168) and (not dst host 192.168.1.200)))'<\/pre>\n
– \u53ea\u6293 SYN \u5305<\/p>\n
tcpdump -i eth1 'tcp[tcpflags] = tcp-syn'<\/pre>\n
– \u6293 SYN, ACK<\/p>\n
tcpdump -i eth1 'tcp[tcpflags] & tcp-syn != 0 and tcp[tcpflags] & tcp-ack != 0'<\/pre>\n
\u6293 SMTP \u6570\u636e
\n———-<\/p>\n
tcpdump -i eth1 '((port 25) and (tcp[(tcp[12]>>2):4] = 0x4d41494c))'<\/pre>\n
\u6293\u53d6\u6570\u636e\u533a\u5f00\u59cb\u4e3a”MAIL”\u7684\u5305\uff0c”MAIL”\u7684\u5341\u516d\u8fdb\u5236\u4e3a 0x4d41494c\u3002
\n\u6293 HTTP GET \u6570\u636e
\n————–<\/p>\n
tcpdump -i eth1 'tcp[(tcp[12]>>2):4] = 0x47455420'<\/pre>\n
“GET “\u7684\u5341\u516d\u8fdb\u5236\u662f 47455420
\n\u6293 SSH \u8fd4\u56de
\n———<\/p>\n
tcpdump -i eth1 'tcp[(tcp[12]>>2):4] = 0x5353482D'<\/pre>\n
“SSH-“\u7684\u5341\u516d\u8fdb\u5236\u662f 0x5353482D<\/p>\n
tcpdump -i eth1 '(tcp[(tcp[12]>>2):4] = 0x5353482D) and (tcp[((tcp[12]>>2)+4):2]\r\n= 0x312E)'\u6293\u8001\u7248\u672c\u7684 SSH \u8fd4\u56de\u4fe1\u606f\uff0c\u5982\"SSH-1.99..\"<\/pre>\n
– \u6293 DNS \u8bf7\u6c42\u6570\u636e<\/p>\n
tcpdump -i eth1 udp dst port 53<\/pre>\n
\u5176\u4ed6
\n—-
\n-c \u53c2\u6570\u5bf9\u4e8e\u8fd0\u7ef4\u4eba\u5458\u6765\u8bf4\u4e5f\u6bd4\u8f83\u5e38\u7528\uff0c\u56e0\u4e3a\u6d41\u91cf\u6bd4\u8f83\u5927\u7684\u670d\u52a1\u5668\uff0c\u9760\u4eba\u5de5 CTRL+C \u8fd8\u662f
\n\u6293\u7684\u592a\u591a\uff0c\u4e8e\u662f\u53ef\u4ee5\u7528-c \u53c2\u6570\u6307\u5b9a\u6293\u591a\u5c11\u4e2a\u5305\u3002<\/p>\n
time tcpdump -nn -i eth0 'tcp[tcpflags] = tcp-syn' -c 10000 > \/dev\/null<\/pre>\n
\u4e0a\u9762\u7684\u547d\u4ee4\u8ba1\u7b97\u6293 10000 \u4e2a SYN \u5305\u82b1\u8d39\u591a\u5c11\u65f6\u95f4\uff0c\u53ef\u4ee5\u5224\u65ad\u8bbf\u95ee\u91cf\u5927\u6982\u662f\u591a\u5c11\u3002<\/p>\n
\u5b9e\u65f6\u6293\u53d6\u7aef\u53e3\u53f78000\u7684GET\u5305\uff0c\u7136\u540e\u5199\u5165GET.log<\/p>\n
tcpdump -i eth0 '((port 8000) and (tcp[(tcp[12]>>2):4]=0x47455420))' -nnAl -w \/tmp\/GET.log<\/pre>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
\u57fa\u672c\u8bed\u6cd5 ======== \u8fc7\u6ee4\u4e3b\u673a ——– … \u7ee7\u7eed\u9605\u8bfb →<\/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":[21],"tags":[],"class_list":["post-92","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts\/92","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=92"}],"version-history":[{"count":2,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts\/92\/revisions"}],"predecessor-version":[{"id":94,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts\/92\/revisions\/94"}],"wp:attachment":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=92"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=92"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=92"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}