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vacm_context.c
资源名称：net-snmp-5.2.2.rar　[点击查看]
上传用户：wxp200602
上传日期：2007-10-30
资源大小：4028k
文件大小：5k
源码类别：

SNMP编程

开发平台：

Unix_Linux

vacm_context.c：源码内容
  1. #include <net-snmp/net-snmp-config.h>
  3. #if HAVE_STRING_H
  4. #include <string.h>
  5. #else
  6. #include <strings.h>
  7. #endif
  9. #include <net-snmp/net-snmp-includes.h>
  10. #include <net-snmp/agent/net-snmp-agent-includes.h>
  11. #include <net-snmp/agent/table.h>
  12. #include <net-snmp/agent/table_iterator.h>
  14. #include "vacm_context.h"
  16. static oid      vacm_context_oid[] = { 1, 3, 6, 1, 6, 3, 16, 1, 1 };
  18. #define CONTEXTNAME_COLUMN 1
  20. /*
  21.  * return the index data from the first node in the agent's
  22.  * subtree_context_cache list.
  23.  */
  24. netsnmp_variable_list *
  25. get_first_context(void **my_loop_context, void **my_data_context,
  26.                   netsnmp_variable_list * put_data,
  27.                   netsnmp_iterator_info *iinfo)
  28. {
  29.     subtree_context_cache *context_ptr;
  30.     context_ptr = get_top_context_cache();
  32.     if (!context_ptr)
  33.         return NULL;
  35.     *my_loop_context = context_ptr;
  36.     *my_data_context = context_ptr;
  38.     snmp_set_var_value(put_data, context_ptr->context_name,
  39.                        strlen(context_ptr->context_name));
  40.     return put_data;
  41. }
  43. /*
  44.  * return the next index data from the first node in the agent's
  45.  * subtree_context_cache list.
  46.  */
  47. netsnmp_variable_list *
  48. get_next_context(void **my_loop_context,
  49.                  void **my_data_context,
  50.                  netsnmp_variable_list * put_data,
  51.                  netsnmp_iterator_info *iinfo)
  52. {
  53.     subtree_context_cache *context_ptr;
  55.     if (!my_loop_context || !*my_loop_context)
  56.         return NULL;
  58.     context_ptr = (subtree_context_cache *) (*my_loop_context);
  59.     context_ptr = context_ptr->next;
  60.     *my_loop_context = context_ptr;
  61.     *my_data_context = context_ptr;
  63.     if (!context_ptr)
  64.         return NULL;
  66.     snmp_set_var_value(put_data, context_ptr->context_name,
  67.                        strlen(context_ptr->context_name));
  68.     return put_data;
  69. }
  71. void
  72. init_vacm_context(void)
  73. {
  74.     /*
  75.      * table vacm_context
  76.      */
  77.     netsnmp_handler_registration *my_handler;
  78.     netsnmp_table_registration_info *table_info;
  79.     netsnmp_iterator_info *iinfo;
  81.     my_handler = netsnmp_create_handler_registration("vacm_context",
  82.                                                      vacm_context_handler,
  83.                                                      vacm_context_oid,
  84.                                                      sizeof
  85.                                                      (vacm_context_oid) /
  86.                                                      sizeof(oid),
  87.                                                      HANDLER_CAN_RONLY);
  89.     if (!my_handler)
  90.         return;
  92.     table_info = SNMP_MALLOC_TYPEDEF(netsnmp_table_registration_info);
  93.     iinfo = SNMP_MALLOC_TYPEDEF(netsnmp_iterator_info);
  95.     if (!table_info || !iinfo)
  96.         return;
  98.     netsnmp_table_helper_add_index(table_info, ASN_OCTET_STR)
  99.         table_info->min_column = 1;
  100.     table_info->max_column = 1;
  101.     iinfo->get_first_data_point = get_first_context;
  102.     iinfo->get_next_data_point = get_next_context;
  103.     iinfo->table_reginfo = table_info;
  104.     netsnmp_register_table_iterator(my_handler, iinfo);
  105. }
  107. /*
  108.  * returns a list of known context names
  109.  */
  111. int
  112. vacm_context_handler(netsnmp_mib_handler *handler,
  113.                      netsnmp_handler_registration *reginfo,
  114.                      netsnmp_agent_request_info *reqinfo,
  115.                      netsnmp_request_info *requests)
  116. {
  117.     subtree_context_cache *context_ptr;
  119.     for(; requests; requests = requests->next) {
  120.         netsnmp_variable_list *var = requests->requestvb;
  122.         if (requests->processed != 0)
  123.             continue;
  126.         context_ptr = (subtree_context_cache *)
  127.             netsnmp_extract_iterator_context(requests);
  129.         if (context_ptr == NULL) {
  130.             snmp_log(LOG_ERR,
  131.                      "vacm_context_handler called without datan");
  132.             continue;
  133.         }
  135.         switch (reqinfo->mode) {
  136.         case MODE_GET:
  137.             /*
  138.              * if here we should have a context_ptr passed in already 
  139.              */
  140.             /*
  141.              * only one column should ever reach us, so don't check it 
  142.              */
  143.             snmp_set_var_typed_value(var, ASN_OCTET_STR,
  144.                                      context_ptr->context_name,
  145.                                      strlen(context_ptr->context_name));
  147.             break;
  149.         default:
  150.             /*
  151.              * We should never get here, getnext already have been
  152.              * handled by the table_iterator and we're read_only 
  153.              */
  154.             snmp_log(LOG_ERR,
  155.                      "vacm_context table accessed as mode=%d.  We're improperly registered!",
  156.                      reqinfo->mode);
  157.             break;
  160.         }
  161.     }
  163.     return SNMP_ERR_NOERROR;
  164. }