扩展net-snmp[难道我的真的有问题]

suertang

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：

1. 
   
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

1. 
   
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. */
   
6. 
   
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"
    
11. 
    
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. */
    
18. 
    
19. oid             netSNMPMIB_variables_oid[] = { 1, 3, 6, 1, 4, 1, 8888 };
    
20. 
    
21. /*
    
22. * variable4 netSNMPMIB_variables:
    
23. *   this variable defines function callbacks and type return information
    
24. *   for the netSNMPMIB mib section
    
25. */
    
26. 
    
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}},
    
35. 
    
36. };
    
37. 
    
38. /*
    
39. * (L = length of the oidsuffix)
    
40. */
    
41. 
    
42. 
    
43. /** Initializes the netSNMPMIB module */
    
44. void
    
45. init_netSNMPMIB(void)
    
46. {
    
47. 
    
48.     DEBUGMSGTL(("netSNMPMIB", "Initializing\n"));
    
49. 
    
50.     /*
    
51.      * register ourselves with the agent to handle our mib tree
    
52.      */
    
53.     REGISTER_MIB("netSNMPMIB", netSNMPMIB_variables, variable4,
    
54.                  netSNMPMIB_variables_oid);
    
55. 
    
56.     /*
    
57.      * place any other initialization junk you need here
    
58.      */
    
59. }
    
60. 
    
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;
    
87. 
    
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) {
    
96. 
    
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. }
     
119. 
     

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各位高手帮帮忙啦

lris

定义mib:
struct variable3 netSNMPMIB_variables

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

suertang

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

lris

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