扩展net-snmp[难道我的真的有问题]

Question

问题：
一下代码可以通过编译。通过MIB浏览器可以获得第一个值，但是没有办法获得第二个值，请教各位，为什么啊？
浏览器提示：

2. Sent get request to 192.168.124.42 : 161
3. Request Failed: Get Response PDU received from 192.168.124.42
4. Error Indication in response: There is no such variable name in this mib.
5. Errindex: 1

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一下是源代码

2. /*
3. * Note: this file originally auto-generated by mib2c using
4. *        : mib2c.old-api.conf 14476 2006-04-18 17:36:51Z hardaker $
5. */
7. #include <net-snmp/net-snmp-config.h>
8. #include <net-snmp/net-snmp-includes.h>
9. #include <net-snmp/agent/net-snmp-agent-includes.h>
10. #include "netSNMPMIB.h"
12. /*
13. * netSNMPMIB_variables_oid:
14. *   this is the top level oid that we want to register under.  This
15. *   is essentially a prefix, with the suffix appearing in the
16. *   variable below.
17. */
19. oid             netSNMPMIB_variables_oid[] = { 1, 3, 6, 1, 4, 1, 8888 };
21. /*
22. * variable4 netSNMPMIB_variables:
23. *   this variable defines function callbacks and type return information
24. *   for the netSNMPMIB mib section
25. */
27. struct variable7 netSNMPMIB_variables[] = {
28.     /*
29.      * magic number        , variable type , ro/rw , callback fn  , L, oidsuffix
30.      */
31. #define VER                1
32.     {VER, ASN_OCTET_STR, RONLY, var_netSNMPMIB, 3, {1, 1, 1}},
33. #define READCOM                2
34.     {READCOM, ASN_OCTET_STR, RONLY, var_netSNMPMIB, 3, {1, 1, 2}},
36. };
38. /*
39. * (L = length of the oidsuffix)
40. */
43. /** Initializes the netSNMPMIB module */
44. void
45. init_netSNMPMIB(void)
46. {
48.     DEBUGMSGTL(("netSNMPMIB", "Initializing\n"));
50.     /*
51.      * register ourselves with the agent to handle our mib tree
52.      */
53.     REGISTER_MIB("netSNMPMIB", netSNMPMIB_variables, variable4,
54.                  netSNMPMIB_variables_oid);
56.     /*
57.      * place any other initialization junk you need here
58.      */
59. }
61. /*
62. * var_netSNMPMIB():
63. *   This function is called every time the agent gets a request for
64. *   a scalar variable that might be found within your mib section
65. *   registered above.  It is up to you to do the right thing and
66. *   return the correct value.
67. *     You should also correct the value of "var_len" if necessary.
68. *
69. *   Please see the documentation for more information about writing
70. *   module extensions, and check out the examples in the examples
71. *   and mibII directories.
72. */
73. unsigned char  *
74. var_netSNMPMIB(struct variable *vp,
75.                oid * name,
76.                size_t *length,
77.                int exact, size_t *var_len, WriteMethod ** write_method)
78. {
79.     /*
80.      * variables we may use later
81.      */
82.     static long     long_ret;
83.     static u_long   ulong_ret;
84.     static unsigned char string[SPRINT_MAX_LEN];
85.     static oid      objid[MAX_OID_LEN];
86.     static struct counter64 c64;
88.     if (header_generic(vp, name, length, exact, var_len, write_method)
89.         == MATCH_FAILED)
90.         return NULL;
91.                
92.     /*
93.      * this is where we do the value assignments for the mib results.
94.      */
95.     switch (vp->magic) {
97. //×××××××××××××××××××××××××从这里开始修改的
98.     case VER:       
99.             {
100.         sprintf(string,"testjjj");            /* XXX */
101.         *var_len = strlen(string);
102.         return (u_char *) & long_ret;
103.        }
104.       break;
105.     case READCOM:
106.             {       
107.         sprintf(string,"com");
108.         long_ret = atol(string);         /* XXX */
109.         
110.         return (u_char *) &long_ret;
111.        }
112.       break;
113. //*****************************修改结束
114.     default:
115.         ERROR_MSG("");
116.     }
117.     return NULL;
118. }

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各位高手帮帮忙啦

Answer 1

定义mib:
struct variable3 netSNMPMIB_variables

REGISTER_MIB("netSNMPMIB", netSNMPMIB_variables, variable3,
                 netSNMPMIB_variables_oid);

Answer 2

楼上的可以说清楚一点吗？我还是不知道怎么修改我的代码啊！
多谢回复了

Answer 3

你在1.3.6.1.4.1.8888.1.1.1想放入 testjjj，1.3.6.1.4.1.8888.1.1.2放入com,
  case VER:        
            {
        sprintf(string,"testjjj");            /* XXX */
        *var_len = strlen(string);
        return (u_char *) & long_ret;
       }
      break;
   返回时，该给long_ret赋值吧