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Ratan Guptaec26fa62018-04-16 15:28:36 +05301#include "snmp_notification.hpp"
Patrick Williams1334b7b2021-02-22 17:15:12 -06002
Ratan Gupta63476192018-04-19 16:55:32 +05303#include "snmp_util.hpp"
Patrick Williams1334b7b2021-02-22 17:15:12 -06004#include "xyz/openbmc_project/Common/error.hpp"
Ratan Guptaec26fa62018-04-16 15:28:36 +05305
6#include <phosphor-logging/elog-errors.hpp>
7#include <phosphor-logging/log.hpp>
8
Ratan Guptaec26fa62018-04-16 15:28:36 +05309namespace phosphor
10{
11namespace network
12{
13namespace snmp
14{
15
16using namespace phosphor::logging;
17using namespace sdbusplus::xyz::openbmc_project::Common::Error;
18
19using snmpSessionPtr =
20 std::unique_ptr<netsnmp_session, decltype(&::snmp_close)>;
21
22bool Notification::addPDUVar(netsnmp_pdu& pdu, const OID& objID,
23 size_t objIDLen, u_char type, Value val)
24{
25 netsnmp_variable_list* varList = nullptr;
26 switch (type)
27 {
28 case ASN_INTEGER:
29 {
Patrick Williams7d4bd222020-05-13 11:05:10 -050030 auto ltmp = std::get<int32_t>(val);
Ratan Guptaec26fa62018-04-16 15:28:36 +053031 varList = snmp_pdu_add_variable(&pdu, objID.data(), objIDLen, type,
32 &ltmp, sizeof(ltmp));
33 }
34 break;
35 case ASN_UNSIGNED:
36 {
Patrick Williams7d4bd222020-05-13 11:05:10 -050037 auto ltmp = std::get<uint32_t>(val);
Ratan Guptaec26fa62018-04-16 15:28:36 +053038 varList = snmp_pdu_add_variable(&pdu, objID.data(), objIDLen, type,
39 &ltmp, sizeof(ltmp));
40 }
41 break;
42 case ASN_OPAQUE_U64:
43 {
Patrick Williams7d4bd222020-05-13 11:05:10 -050044 auto ltmp = std::get<uint64_t>(val);
Ratan Guptaec26fa62018-04-16 15:28:36 +053045 varList = snmp_pdu_add_variable(&pdu, objID.data(), objIDLen, type,
46 &ltmp, sizeof(ltmp));
47 }
48 break;
49 case ASN_OCTET_STR:
50 {
Patrick Williams7d4bd222020-05-13 11:05:10 -050051 const auto& value = std::get<std::string>(val);
Ratan Guptaec26fa62018-04-16 15:28:36 +053052 varList = snmp_pdu_add_variable(&pdu, objID.data(), objIDLen, type,
53 value.c_str(), value.length());
54 }
55 break;
56 }
57 return (varList == nullptr ? false : true);
58}
59
60void Notification::sendTrap()
61{
Ratan Guptaec26fa62018-04-16 15:28:36 +053062 constexpr auto comm = "public";
Ratan Gupta34d129a2021-12-04 21:04:51 +053063 netsnmp_session session{};
Ratan Guptaec26fa62018-04-16 15:28:36 +053064 snmp_sess_init(&session);
65
66 init_snmp("snmpapp");
67
68 // TODO: https://github.com/openbmc/openbmc/issues/3145
69 session.version = SNMP_VERSION_2c;
70 session.community = (u_char*)comm;
71 session.community_len = strlen(comm);
72 session.callback = nullptr;
73 session.callback_magic = nullptr;
74
Ratan Gupta63476192018-04-19 16:55:32 +053075 auto mgrs = getManagers();
Ratan Guptaec26fa62018-04-16 15:28:36 +053076
Ratan Gupta63476192018-04-19 16:55:32 +053077 for (auto& mgr : mgrs)
Ratan Guptaec26fa62018-04-16 15:28:36 +053078 {
Ratan Gupta63476192018-04-19 16:55:32 +053079 session.peername = const_cast<char*>(mgr.c_str());
80 // create the session
81 auto ss = snmp_add(
82 &session,
83 netsnmp_transport_open_client("snmptrap", session.peername),
84 nullptr, nullptr);
85 if (!ss)
Ratan Guptaec26fa62018-04-16 15:28:36 +053086 {
Ratan Gupta63476192018-04-19 16:55:32 +053087 log<level::ERR>("Unable to get the snmp session.",
88 entry("SNMPMANAGER=%s", mgr.c_str()));
89 elog<InternalFailure>();
90 }
91
92 // Wrap the raw pointer in RAII
93 snmpSessionPtr sessionPtr(ss, &::snmp_close);
94
95 ss = nullptr;
96
97 auto pdu = snmp_pdu_create(SNMP_MSG_TRAP2);
98 if (!pdu)
99 {
100 log<level::ERR>("Failed to create notification PDU");
101 elog<InternalFailure>();
102 }
103
Ratan Gupta0d5094b2021-03-05 19:25:26 +0530104 // https://tools.ietf.org/search/rfc3416#page-22
105 // add the sysUpTime.0 [RFC3418]
106 auto sysuptime = get_uptime();
107 std::string sysuptimeStr = std::to_string(sysuptime);
108
109 if (snmp_add_var(pdu, sysuptimeOID, sizeof(sysuptimeOID) / sizeof(oid),
110 't', sysuptimeStr.c_str()))
111
112 {
113 log<level::ERR>("Failed to add the SNMP var(systime)");
114 snmp_free_pdu(pdu);
115 elog<InternalFailure>();
116 }
117
Ratan Gupta63476192018-04-19 16:55:32 +0530118 pdu->trap_type = SNMP_TRAP_ENTERPRISESPECIFIC;
119
120 auto trapInfo = getTrapOID();
121
Ratan Gupta0d5094b2021-03-05 19:25:26 +0530122 // add the snmpTrapOID.0 [RFC3418]
Ratan Gupta63476192018-04-19 16:55:32 +0530123 if (!snmp_pdu_add_variable(pdu, SNMPTrapOID,
124 sizeof(SNMPTrapOID) / sizeof(oid),
125 ASN_OBJECT_ID, trapInfo.first.data(),
126 trapInfo.second * sizeof(oid)))
127 {
128 log<level::ERR>("Failed to add the SNMP var(trapID)");
Ratan Guptaec26fa62018-04-16 15:28:36 +0530129 snmp_free_pdu(pdu);
130 elog<InternalFailure>();
131 }
Ratan Guptaec26fa62018-04-16 15:28:36 +0530132
Ratan Gupta63476192018-04-19 16:55:32 +0530133 auto objectList = getFieldOIDList();
134
135 for (const auto& object : objectList)
136 {
137 if (!addPDUVar(*pdu, std::get<0>(object), std::get<1>(object),
138 std::get<2>(object), std::get<3>(object)))
139 {
140 log<level::ERR>("Failed to add the SNMP var");
141 snmp_free_pdu(pdu);
142 elog<InternalFailure>();
143 }
144 }
145 // pdu is freed by snmp_send
146 if (!snmp_send(sessionPtr.get(), pdu))
147 {
148 log<level::ERR>("Failed to send the snmp trap.");
149 elog<InternalFailure>();
150 }
Ratan Guptaec26fa62018-04-16 15:28:36 +0530151
Ratan Gupta212f53e2018-04-30 17:28:05 +0530152 log<level::DEBUG>("Sent SNMP Trap", entry("MGR=%s", mgr.c_str()));
153 }
Ratan Guptaec26fa62018-04-16 15:28:36 +0530154}
155
156} // namespace snmp
157} // namespace network
158} // namespace phosphor