SNMP++v3.x is free open source c++ API library which may be used in different operating systems such as Linux, FreeBSD, Mac OS X, Solaris and Windows. Initially it was developed by Hewlett-Packard, but currently maintained by AGENTPP. I started to use it beginning from version snmp++-3.2.17 and time by time upgrading to newer one. Usually upgrade did not create any problem. But after recent upgrade to version snmp++v3.5.2 my application began crashing in snmp++ code. The crash stack was:
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Snmp_pp::v3MP::EngineIdTable::get_entry (this=this@entry=0x0, engine_id=…, host=…, port=port@entry=161) at mp_v3.cpp:208 #0 Snmp_pp::v3MP::EngineIdTable::get_entry (this=this@entry=0x0, engine_id=…, host=…, port=port@entry=161) at mp_v3.cpp:208 #1 0x00007ffff6365592 in Snmp_pp::v3MP::EngineIdTable::get_entry (this=0x0, engine_id=…, hostport=…) at mp_v3.cpp:201 #2 0x00007ffff638a6b1 in get_from_engine_id_table (hostport=…, engine_id=…, this= #3 Snmp_pp::Snmp::snmp_engine (this=0x7fffdc014cf0, pdu=…, non_reps=0, max_reps=10, target=…, cb=cb@entry=0x0, cbd=cbd@entry=0x0, fd=fd@entry=-1, reports_received=reports_received@entry=0, snmp_message=snmp_message@entry=0x0) at uxsnmp.cpp:1780 #4 0x00007ffff638c015 in Snmp_pp::Snmp::get_bulk (this= |
The code from mp_v3.cpp where crashed happened was:
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int v3MP::EngineIdTable::get_entry(OctetStr &engine_id, const OctetStr &host, int port) const { if (!table) // <= line 208 return SNMPv3_MP_NOT_INITIALIZED; BEGIN_REENTRANT_CODE_BLOCK_CONST; |
After analyzing several example I found that new version is required addition initialization step of Snmp class object. The step is:
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snmp.set_mpv3(v3_MP); // must be set since 3.4.0 |