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 <net-snmp/net-snmp-config.h> #include <net-snmp/net-snmp-includes.h> #include <net-snmp/agent/net-snmp-agent-includes.h> #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