NET-SNMP服务端添加自定义节点.doc

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1、NET-SNMP服务端添加自定义节点编译生成.c和.h文件后，只是一个mib节点文件模板。1代码修改：blue.h/**Note:thisfileoriginallyauto-generatedbymib2cusing*:mib2c.old-api.conf144762006-04-1817:36:51Zhardaker$*/#ifndefBLUE_H#defineBLUE_H/**functiondeclarations*/voidinit_blue(void);FindVarMethodvar_blue;W

2、riteMethodwrite_bluenum;#endif/*BLUE_H*/我们会发现生成的C文件，其实只是一个模版。其中功能实现的地方，以及某些关键地方都留了空，并且有较为详细的英文注释。只需要修改两处即可通过编译，其余部分可根据情况决定是否修改，以及如何修改。blue.c/**Note:thisfileoriginallyauto-generatedbymib2cusing*:mib2c.old-api.conf144762006-04-1817:36:51Zhardaker$*/#include

3、t-snmp/net-snmp-config.h>#include#include#include"blue.h"/**blue_variables_oid:*thisisthetopleveloidthatwewanttoregisterunder.This*isessentiallyaprefix,withthesuffixappearinginthe*variab

4、lebelow.*/oidblue_variables_oid[]={1,3,6,1,4,1,1,1};/**variable4blue_variables:*thisvariabledefinesfunctioncallbacksandtypereturninformation*forthebluemibsection*/structvariable7blue_variables[]={/**magicnumber,variabletype,ro/rw,callbackfn,L,oidsuffix*/#def

5、ineBLUENUM1{BLUENUM,ASN_INTEGER,RWRITE,var_blue,1,{4}},};/**(L=lengthoftheoidsuffix)*//**Initializesthebluemodule*/voidinit_blue(void){DEBUGMSGTL(("blue","Initializing"));/**registerourselveswiththeagenttohandleourmibtree*/REGISTER_MIB("blue",blue_variable

6、s,variable4,blue_variables_oid);/**placeanyotherinitializationjunkyouneedhere*/}/**var_blue():*Thisfunctioniscalledeverytimetheagentgetsarequestfor*ascalarvariablethatmightbefoundwithinyourmibsection*registeredabove.Itisuptoyoutodotherightthingand*returnthec

7、orrectvalue.*Youshouldalsocorrectthevalueof"var_len"ifnecessary.**Pleaseseethedocumentationformoreinformationaboutwriting*moduleextensions,andcheckouttheexamplesintheexamples*andmibIIdirectories.*/unsignedchar*var_blue(structvariable*vp,oid*name,size_t*lengt

8、h,intexact,size_t*var_len,WriteMethod**write_method){/**variableswemayuselater*/staticlonglong_ret;staticu_longulong_ret;staticunsignedcharstring[SPRINT_MAX_LEN];staticoidobjid[MAX_OID_LEN];stat