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31 lines
1.2 KiB
31 lines
1.2 KiB
This modules matches a given string by using some pattern matching strategy. It requires a linux kernel >= 2.6.14. |
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.TP |
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\fB\-\-algo\fP {\fBbm\fP|\fBkmp\fP} |
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Select the pattern matching strategy. (bm = Boyer-Moore, kmp = Knuth-Pratt-Morris) |
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.TP |
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\fB\-\-from\fP \fIoffset\fP |
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Set the offset from which it starts looking for any matching. If not passed, default is 0. |
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.TP |
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\fB\-\-to\fP \fIoffset\fP |
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Set the offset up to which should be scanned. That is, byte \fIoffset\fP-1 |
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(counting from 0) is the last one that is scanned. |
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If not passed, default is the packet size. |
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.TP |
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[\fB!\fP] \fB\-\-string\fP \fIpattern\fP |
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Matches the given pattern. |
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.TP |
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[\fB!\fP] \fB\-\-hex\-string\fP \fIpattern\fP |
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Matches the given pattern in hex notation. |
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.TP |
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\fB\-\-icase\fP |
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Ignore case when searching. |
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.TP |
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Examples: |
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.IP |
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# The string pattern can be used for simple text characters. |
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.br |
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iptables \-A INPUT \-p tcp \-\-dport 80 \-m string \-\-algo bm \-\-string 'GET /index.html' \-j LOG |
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.IP |
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# The hex string pattern can be used for non-printable characters, like |0D 0A| or |0D0A|. |
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.br |
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iptables \-p udp \-\-dport 53 \-m string \-\-algo bm \-\-from 40 \-\-to 57 \-\-hex\-string '|03|www|09|netfilter|03|org|00|'
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