1 /*
2 * Portions of this file are subject to the following copyright(s). See
3 * the Net-SNMP's COPYING file for more details and other copyrights
4 * that may apply:
5 *
6 * Portions of this file are copyrighted by:
7 * Copyright (c) 2016 VMware, Inc. All rights reserved.
8 * Use is subject to license terms specified in the COPYING file
9 * distributed with the Net-SNMP package.
10 */
11
12 #include <net-snmp/net-snmp-config.h>
13 #include <net-snmp/net-snmp-features.h>
14 #include <net-snmp/net-snmp-includes.h>
15 #include <net-snmp/agent/net-snmp-agent-includes.h>
16 #include <net-snmp/agent/snmp_get_statistic.h>
17 #include <stdint.h>
18
19 netsnmp_feature_provide(helper_statistics);
20 netsnmp_feature_child_of(helper_statistics, mib_helpers);
21
22 #ifdef NETSNMP_FEATURE_REQUIRE_HELPER_STATISTICS
23 /* if we're not needed, then neither is this */
24 netsnmp_feature_require(statistics);
25 #endif
26
27 #ifndef NETSNMP_FEATURE_REMOVE_HELPER_STATISTICS
28 static int
netsnmp_get_statistic_helper_handler(netsnmp_mib_handler * handler,netsnmp_handler_registration * reginfo,netsnmp_agent_request_info * reqinfo,netsnmp_request_info * requests)29 netsnmp_get_statistic_helper_handler(netsnmp_mib_handler *handler,
30 netsnmp_handler_registration *reginfo,
31 netsnmp_agent_request_info *reqinfo,
32 netsnmp_request_info *requests)
33 {
34 if (reqinfo->mode == MODE_GET) {
35 const oid idx = requests->requestvb->name[reginfo->rootoid_len - 2] +
36 (oid)(uintptr_t)handler->myvoid;
37 uint32_t value;
38
39 if (idx > NETSNMP_STAT_MAX_STATS)
40 return SNMP_ERR_GENERR;
41 value = snmp_get_statistic(idx);
42 snmp_set_var_typed_value(requests->requestvb, ASN_COUNTER,
43 (const u_char*)&value, sizeof(value));
44 return SNMP_ERR_NOERROR;
45 }
46 return SNMP_ERR_GENERR;
47 }
48
49 static netsnmp_mib_handler *
netsnmp_get_statistic_handler(int offset)50 netsnmp_get_statistic_handler(int offset)
51 {
52 netsnmp_mib_handler *ret =
53 netsnmp_create_handler("get_statistic",
54 netsnmp_get_statistic_helper_handler);
55 if (ret) {
56 ret->flags |= MIB_HANDLER_AUTO_NEXT;
57 ret->myvoid = (void*)(uintptr_t)offset;
58 }
59 return ret;
60 }
61
62 int
netsnmp_register_statistic_handler(netsnmp_handler_registration * reginfo,oid start,int begin,int end)63 netsnmp_register_statistic_handler(netsnmp_handler_registration *reginfo,
64 oid start, int begin, int end)
65 {
66 netsnmp_mib_handler *handler =
67 netsnmp_get_statistic_handler(begin - start);
68 if (!handler ||
69 (netsnmp_inject_handler(reginfo, handler) != SNMPERR_SUCCESS)) {
70 snmp_log(LOG_ERR, "could not create statistic handler\n");
71 netsnmp_handler_free(handler);
72 netsnmp_handler_registration_free(reginfo);
73 return MIB_REGISTRATION_FAILED;
74 }
75 return netsnmp_register_scalar_group(reginfo, start,
76 start + (end - begin));
77 }
78 #else /* !NETSNMP_FEATURE_REMOVE_HELPER_GET_STATISTICS */
79 netsnmp_feature_unused(helper_statistics);
80 #endif /* !NETSNMP_FEATURE_REMOVE_HELPER_GET_STATISTICS */
81