122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
#include <net-snmp/net-snmp-config.h>
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#include <sys/types.h>
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#include <net-snmp/net-snmp-includes.h>
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#include <net-snmp/agent/net-snmp-agent-includes.h>
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#include <net-snmp/agent/multiplexer.h>
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/** @defgroup multiplexer multiplexer
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* Splits mode requests into calls to different handlers.
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* @ingroup utilities
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* The multiplexer helper lets you split the calling chain depending
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* on the calling mode (get vs getnext vs set). Useful if you want
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* different routines to handle different aspects of SNMP requests,
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* which is very common for GET vs SET type actions.
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*
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* Functionally:
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*
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* -# GET requests call the get_method
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* -# GETNEXT requests call the getnext_method, or if not present, the
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* get_method.
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* -# GETBULK requests call the getbulk_method, or if not present, the
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* getnext_method, or if even that isn't present the get_method.
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* -# SET requests call the set_method, or if not present return a
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* SNMP_ERR_NOTWRITABLE error.
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* @{
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*/
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/** returns a multiplixer handler given a netsnmp_mib_handler_methods structure of subhandlers.
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*/
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netsnmp_mib_handler *
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netsnmp_get_multiplexer_handler(netsnmp_mib_handler_methods *req)
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{
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netsnmp_mib_handler *ret = NULL;
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if (!req) {
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snmp_log(LOG_INFO,
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"netsnmp_get_multiplexer_handler(NULL) called\n");
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return NULL;
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}
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ret =
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netsnmp_create_handler("multiplexer",
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netsnmp_multiplexer_helper_handler);
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if (ret) {
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ret->myvoid = (void *) req;
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}
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return ret;
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}
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/** implements the multiplexer helper */
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int
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netsnmp_multiplexer_helper_handler(netsnmp_mib_handler *handler,
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netsnmp_handler_registration *reginfo,
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netsnmp_agent_request_info *reqinfo,
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netsnmp_request_info *requests)
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{
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netsnmp_mib_handler_methods *methods;
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if (!handler->myvoid) {
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snmp_log(LOG_INFO, "improperly registered multiplexer found\n");
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return SNMP_ERR_GENERR;
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}
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methods = (netsnmp_mib_handler_methods *) handler->myvoid;
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switch (reqinfo->mode) {
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case MODE_GETBULK:
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handler = methods->getbulk_handler;
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if (handler)
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break;
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/* Deliberate fallthrough to use GetNext handler */
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/* FALL THROUGH */
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case MODE_GETNEXT:
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handler = methods->getnext_handler;
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if (handler)
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break;
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/* Deliberate fallthrough to use Get handler */
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/* FALL THROUGH */
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case MODE_GET:
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handler = methods->get_handler;
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if (!handler) {
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netsnmp_request_set_error_all(requests, SNMP_NOSUCHOBJECT);
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}
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break;
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#ifndef NETSNMP_NO_WRITE_SUPPORT
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case MODE_SET_RESERVE1:
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case MODE_SET_RESERVE2:
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case MODE_SET_ACTION:
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case MODE_SET_COMMIT:
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case MODE_SET_FREE:
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case MODE_SET_UNDO:
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handler = methods->set_handler;
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if (!handler) {
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netsnmp_request_set_error_all(requests, SNMP_ERR_NOTWRITABLE);
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return SNMP_ERR_NOERROR;
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}
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break;
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/*
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* XXX: process SETs specially, and possibly others
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*/
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#endif /* NETSNMP_NO_WRITE_SUPPORT */
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default:
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snmp_log(LOG_ERR, "unsupported mode for multiplexer: %d\n",
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reqinfo->mode);
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return SNMP_ERR_GENERR;
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}
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if (!handler) {
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snmp_log(LOG_ERR,
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"No handler enabled for mode %d in multiplexer\n",
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reqinfo->mode);
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return SNMP_ERR_GENERR;
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}
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return netsnmp_call_handler(handler, reginfo, reqinfo, requests);
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}
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/** @} */
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