作者literkid (literkid)
看板NetSecurity
標題[問題] 關於SNORT無法插入範例的preprocessor
時間Sun Sep 16 00:02:02 2007
請教各位有使用過SNORT的先進
我在FreeBSD 6.2上安裝SNORT 2.6.1.5的版本
我參考以下這個網頁來插入範例的preprocessor，結果遇到一些問題
http://afrodita.unicauca.edu.co/~cbedon/snort/spp_kickstart.html
我的操作步驟如下：
1.複製$SNORT_DIR/templates/spp_template.c和spp_template.h的檔案到
$SNORT_DIR/src/preprocessors/下
2.修改to $SNORT_DIR/src/plugbase.c，如下：
In the includes section:
/* built-in preprocessors */
/*My preprocessor*/
#include "preprocessors/spp_template.h"
(...)
In the function InitPreprocessors:
void InitPreprocessors(){
/*My preprocessor*/
SetupTemplate();
3.修改$SNORT_DIR/src/preprocessors/Makefile.in，如下
libspp_a_SOURCES = spp_arpspoof.c spp_arpspoof.h spp_bo.c spp_bo.h \
(...)
spp_template.c spp_template.h
am_libspp_a_OBJECTS = spp_arpspoof.$(OBJEXT) spp_bo.$(OBJEXT) \
spp_template.$(OBJEXT)
4.執行configure和make，訊息如下：
##################################################################
gcc -DHAVE_CONFIG_H -I. -I. -I../.. -I../.. -I../../src -I../../src/sfutil
-I../../src/output-plugins -I../../src/detection-plugins
-I../../src/dynamic-plugins -I../../src/preprocessors
-I../../src/preprocessors/flow -I../../src/preprocessors/portscan
-I../../src/preprocessors/flow/int-snort
-I../../src/preprocessors/HttpInspect/include
-I../../src/preprocessors/Stream5 -I/usr/local/include -g -O2 -Wall
-DDYNAMIC_PLUGIN -c spp_template.c
spp_template.c: In function `SetupTemplate':
spp_template.c:100: warning: implicit declaration of function `DebugMessage'
spp_template.c:100: error: `DEBUG_PLUGIN' undeclared (first use in this
function)
spp_template.c:100: error: (Each undeclared identifier is reported only once
spp_template.c:100: error: for each function it appears in.)
spp_template.c: In function `TemplateInit':
spp_template.c:117: error: `DEBUG_PLUGIN' undeclared (first use in this
function)
spp_template.c:131: warning: passing arg 1 of `AddFuncToPreprocList' from
incompatible pointer type
spp_template.c:131: error: too few arguments to function
`AddFuncToPreprocList'
*** Error code 1
Stop in /usr/src/literkid/snort-2.6.1.5/src/preprocessors.
*** Error code 1
Stop in /usr/src/literkid/snort-2.6.1.5/src/preprocessors.
*** Error code 1
Stop in /usr/src/literkid/snort-2.6.1.5/src.
*** Error code 1
Stop in /usr/src/literkid/snort-2.6.1.5.
*** Error code 1
Stop in /usr/src/literkid/snort-2.6.1.5.
##################################################################
5.因為範例程式碼裡的DEBUG_PLUGIN未定義，所以在spp_template.c加入debug.h函式庫
#include "debug.h"
編譯後的訊息如下：
##################################################################
spp_template.c: In function `SetupTemplate':
spp_template.c:102: warning: implicit declaration of function `DebugMessage'
spp_template.c: In function `TemplateInit':
spp_template.c:133: warning: passing arg 1 of `AddFuncToPreprocList' from
incompatible pointer type
spp_template.c:133: error: too few arguments to function
`AddFuncToPreprocList'
*** Error code 1
Stop in /usr/src/literkid/snort-2.6.1.5/src/preprocessors.
*** Error code 1
##################################################################
6.用DEBUG_WRAP()把DebugMessage()包起來
100:
DEBUG_WRAP(DebugMessage(DEBUG_PLUGIN,"Preprocessor: Template is
setup...\n"););
117:
DEBUG_WRAP(DebugMessage(DEBUG_PLUGIN,"Preprocessor: Template
Initialized\n"););
編譯後的訊息如下：
##################################################################
spp_template.c: In function `TemplateInit':
spp_template.c:133: warning: passing arg 1 of `AddFuncToPreprocList' from
incompatible pointer type
spp_template.c:133: error: too few arguments to function
`AddFuncToPreprocList'
*** Error code 1
Stop in /usr/src/literkid/snort-2.6.1.5/src/preprocessors.
*** Error code 1
##################################################################
7.新版的SNORT似乎修改了AddFuncToPreprocList()的參數，故修改如下
131:
AddFuncToPreprocList(PreprocFunction, 0, 0);
8.編譯後沒有錯誤訊息，故把範例的preprocessor加入$SNORT/etc/snort.conf的設定
執行snort -c $SNORT/etc/snort.conf的結果如下：
##################################################################
etc/snort.conf(803) unknown dynamic preprocessor "template"
ERROR: Misconfigured dynamic preprocessor(s)
Fatal Error, Quitting..
##################################################################
有人遇過相同的問題嗎？可以幫我解答嗎？非常謝謝！
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