Net-snmp:接收Trap的api

Net-snmp:接收Trap的api

net-snmp使用的是snmptrapd来接收trap，我想自己写程序接收trap，也看了snmptrapd.c代码，很繁琐。

有没有更简单一点的例子。

net-snmp作为管理端功能有点欠缺，可以使用snmp++毕业论文

-- BRD-SYS-MIB.my -- MIB generated by MG-SOFT Visual MIB Builder Version 6.0  Build 88 -- Monday, July 11, 2011 at 17:14:41 --       BRD-SYS-MIB DEFINITIONS ::= BEGIN            IMPORTS             OBJECT-GROUP, NOTIFICATION-GROUP                             FROM SNMPv2-CONF                         enterprises, OBJECT-TYPE, MODULE-IDENTITY, OBJECT-IDENTITY, NOTIFICATION-TYPE                             FROM SNMPv2-SMI;                     -- 1.3.6.1.4.1.30000.1         brdModule MODULE-IDENTITY              LAST-UPDATED "201007061242Z"        -- July 06, 2010 at 12:42 GMT             ORGANIZATION                  "Organization."             CONTACT-INFO                  "Contact-info."             DESCRIPTION                  "Description."             ::= { broadtech 1 }                   -- -- Node definitions --               -- 1.3.6.1.4.1.30000         broadtech OBJECT-IDENTITY             STATUS current             DESCRIPTION                  "The root of the OID sub-tree assigned to Company by the Internet Assigned Numbers Authority (IANA)"             ::= { enterprises 30000 }                     -- 1.3.6.1.4.1.30000.1.1         system OBJECT IDENTIFIER ::= { brdModule 1 }                     -- 1.3.6.1.4.1.30000.1.1.1         realvalue OBJECT IDENTIFIER ::= { system 1 }                     -- 1.3.6.1.4.1.30000.1.1.1.1         cpu OBJECT-TYPE             SYNTAX INTEGER (0..100)             MAX-ACCESS read-only             STATUS current             DESCRIPTION                 "Description."             ::= { realvalue 1 }                     -- 1.3.6.1.4.1.30000.1.1.1.2         maxcpu OBJECT-TYPE             SYNTAX INTEGER (50..100)             MAX-ACCESS read-write             STATUS current             DESCRIPTION                 "Description."             ::= { realvalue 2 }                     -- 1.3.6.1.4.1.30000.1.1.1.3         notifycpu NOTIFICATION-TYPE             OBJECTS { cpu }             STATUS current             DESCRIPTION                  "Description."             ::= { realvalue 3 }                     -- 1.3.6.1.4.1.30000.1.1.1.4         realgroup OBJECT-GROUP             OBJECTS { cpu, maxcpu }             STATUS current             DESCRIPTION                  "Description."             ::= { realvalue 4 }                     -- 1.3.6.1.4.1.30000.1.1.1.5         notifygroup NOTIFICATION-GROUP             NOTIFICATIONS { notifycpu }             STATUS current             DESCRIPTION                  "Description."             ::= { realvalue 5 }                       END --+--brdModule(1) --   | --   +--system(1) --      | --      +--realvalue(1) --         | --         +-- -R-- INTEGER   cpu(1) --         |        Range: 0..100 --         +-- -RW- INTEGER   maxcpu(2) --         |        Range: 50..100 --         +--notifycpu(3) --         +--realgroup(4) --         +--notifygroup(5) -- -- BRD-SYS-MIB.my --

asn.1用的mgMibBrowser生成的。

头文件：

C/C++ code?1234567891011121314151617 /*  * Note: this file originally auto-generated by mib2c using  *        : mib2c.int_watch.conf 17587 2009-04-30 06:57:27Z magfr $  */#ifndef BRDMODULE_H #define BRDMODULE_H     /*  * function declarations   */void            init_brdModule(void); int             send_notifycpu_trap(void); void        updateValueOfCpu(unsigned int clientreg, void *clientarg);   #endif                          /* BRDMODULE_H */

下面是C代码：

C/C++ code?/*  * Note: this file originally auto-generated by mib2c using  *        : mib2c.int_watch.conf 17587 2009-04-30 06:57:27Z magfr $  */  #include #include #include #include "brdModule.h" #include "getcpu.h"       //for get cpu rate   /*  * The variables we want to tie the relevant OIDs to.  * The agent will handle all GET and (if applicable) SET requests  * to these variables automatically, changing the values as needed.  */  long            cpu = 0;        /* XXX: set default value */long            maxcpu = 0;     /* XXX: set default value */      static const oid snmptrap_oid[] = { 1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0 };   int     //mib2c auto make and modifyed send_notifycpu_trap(void) {     netsnmp_variable_list *var_list = NULL;     const oid       notifycpu_oid[] =         { 1, 3, 6, 1, 4, 1, 30000, 1, 1, 1, 3 };     const oid       cpu_oid[] = { 1, 3, 6, 1, 4, 1, 30000, 1, 1, 1, 1, 0 };       /*      * Set the snmpTrapOid.0 value      */    snmp_varlist_add_variable(&var_list,                               snmptrap_oid, OID_LENGTH(snmptrap_oid),                               ASN_OBJECT_ID,                               notifycpu_oid, sizeof(notifycpu_oid));       /*      * Add any objects from the trap definition      */    snmp_varlist_add_variable(&var_list,                               cpu_oid, OID_LENGTH(cpu_oid), ASN_INTEGER,                               /*                                * Set an appropriate value for cpu                                 */                              (long*)&cpu, sizeof(cpu));  //modifyed by ligang       /*      * Add any extra (optional) objects here      */      /*      * Send the trap to the list of configured destinations      *  and clean up      */    send_v2trap(var_list);     snmp_free_varbind(var_list);       return SNMP_ERR_NOERROR; }     /*  * Our initialization routine, called automatically by the agent   * (Note that the function name must match init_FILENAME())   */void   //mib2c auto make and modifyed init_brdModule(void) {     netsnmp_handler_registration *reg;       const oid       cpu_oid[] = { 1, 3, 6, 1, 4, 1, 30000, 1, 1, 1, 1 };     static netsnmp_watcher_info cpu_winfo;     const oid       maxcpu_oid[] = { 1, 3, 6, 1, 4, 1, 30000, 1, 1, 1, 2 };     static netsnmp_watcher_info maxcpu_winfo;       /*      * a debugging statement.  Run the agent with -DbrdModule to see      * the output of this debugging statement.       */    DEBUGMSGTL(("brdModule", "Initializing the brdModule module\n"));         /*      * Register scalar watchers for each of the MIB objects.      * The ASN type and RO/RW status are taken from the MIB definition,      * but can be adjusted if needed.      *      * In most circumstances, the scalar watcher will handle all      * of the necessary processing.  But the NULL parameter in the      * netsnmp_create_handler_registration() call can be used to      * supply a user-provided handler if necessary.      *      * This approach can also be used to handle Counter64, string-      * and OID-based watched scalars (although variable-sized writeable      * objects will need some more specialised initialisation).      */    DEBUGMSGTL(("brdModule",                 "Initializing cpu scalar integer.  Default value = %d\n",                 cpu));     reg = netsnmp_create_handler_registration("cpu", NULL,                                               cpu_oid, OID_LENGTH(cpu_oid),                                               HANDLER_CAN_RONLY);     netsnmp_init_watcher_info(&cpu_winfo, &cpu, sizeof(long),                               ASN_INTEGER, WATCHER_FIXED_SIZE);     if (netsnmp_register_watched_scalar(reg, &cpu_winfo) < 0) {         snmp_log(LOG_ERR, "Failed to register watched cpu");     }       DEBUGMSGTL(("brdModule",                 "Initializing maxcpu scalar integer.  Default value = %d\n",                 maxcpu));     reg = netsnmp_create_handler_registration("maxcpu", NULL,                                               maxcpu_oid,                                               OID_LENGTH(maxcpu_oid),                                               HANDLER_CAN_RWRITE);     netsnmp_init_watcher_info(&maxcpu_winfo, &maxcpu, sizeof(long),                               ASN_INTEGER, WATCHER_FIXED_SIZE);     if (netsnmp_register_watched_scalar(reg, &maxcpu_winfo) < 0) {         snmp_log(LOG_ERR, "Failed to register watched maxcpu");     }         DEBUGMSGTL(("brdModule", "Done initalizing brdModule module\n"));     /*add a timer 3s:HANDLE FUNCTION IS updateValueOfCpu WITHOUT ARGS*/    snmp_alarm_register(3,SA_REPEAT,updateValueOfCpu,NULL); } /*timer handle function*/void updateValueOfCpu(unsigned int clientreg, void *clientarg) {     cpu=getcpurate(NULL);     printf("%d %d\n",cpu,maxcpu);     if(cpu>maxcpu)//all oid's value in memery        send_notifycpu_trap();//send trap     return; }

Makefile

C/C++ code?# # Warning: you may need more libraries than are included here on the # build line.  The agent frequently needs various libraries in order # to compile pieces of it, but is OS dependent and we can't list all # the combinations here.  Instead, look at the libraries that were # used when linking the snmpd master agent and copy those to this # file. #   CC=gcc   OBJS1=snmpdemoapp.o OBJS2=example-demon.o nstAgentSubagentObject.o OBJS3=asyncapp.o TARGETS=example-demon snmpdemoapp asyncapp   CFLAGS=-I. `net-snmp-config --cflags` BUILDLIBS=`net-snmp-config --libs` BUILDAGENTLIBS=`net-snmp-config --agent-libs`   # shared library flags (assumes gcc) DLFLAGS=-fPIC -shared   all: $(TARGETS)   snmpdemoapp: $(OBJS1)     $(CC) -o snmpdemoapp $(OBJS1) $(BUILDLIBS)   asyncapp: $(OBJS3)     $(CC) -o asyncapp $(OBJS3) $(BUILDLIBS)   example-demon: $(OBJS2)     $(CC) -o example-demon $(OBJS2)  $(BUILDAGENTLIBS)   clean:     rm $(OBJS2) $(OBJS2) $(TARGETS) brdModule.so: brdModule.c Makefile     $(CC) $(CFLAGS) $(DLFLAGS) -c -o brdModule.o brdModule.c     $(CC) $(CFLAGS) $(DLFLAGS) -c -o getcpu.o getcpu.c     $(CC) $(CFLAGS) $(DLFLAGS) -o brdModule.so brdModule.o getcpu.o

配置文件有点复杂，就不贴了。

采用动态库方式运行

需要完整程序、配置的 PM