Hello coders!
This mail has already been sent, but in mailing list it is arranged in wrong
order so I'm sending it again.
Nice day,
Igor G.
____________________________________________________________________________
___
Related to my poor deaf or better dead master agent I discovered few things.
When I manage to achive the state of 'darknes' :) at master agent I I
connect remotely to the master with the gdb. There is no other living agentx
client or something else to disturb my test case. When connected, master is
mostly in the select() at snmpd.c.
Then I make some snmp request from some other device and I discovered, that
with every request in function 'netsnmp_handle_request (asp=0x189310,
status=560432) at snmp_agent.c:2935' global pointer 'netsnmp_processing_set'
pointing at some structure. If I understand right coments in code:
"
* if this isn't a delegated request trying to finish,
* processing of a set request should not start until all
* delegated requests have completed, and no other new requests
* should be processed until the set request completes.
"
and code itself, every new requests is added to the requests linked list
instead of processed imediatly. And it seems to me, that from this state is
no return for master unless it is restarted...
I concluded, that in master agent in some point of processing get, set and
agentx requests disarrange this requests, one of set becomes delegated and
no other processing is further possible. Actually, every further requests is
added to the delegated requests queue.
Bellow is debugger listing, which make me thought about that. And
interesting, I made up the same test environment at much faster PC machine,
there is no slow peripheral devices like in the presented embedded system.
Guess what, after few days of testing, I couldn't achive the deaf master
agent (!). (By the way: I made test script, which is doing periodicaly
get/set requests and restarting one subagent)
Now I'm begging you... please help!
Nice day,
Igor G.
============================================================================
============
Breakpoint 2, netsnmp_handle_request (asp=0x18e640, status=560432)
at snmp_agent.c:2935
2935 if ((0 == netsnmp_check_delegated_chain_for(asp)) &&
(gdb) p *asp
$37 = {mode = 0, session = 0x88f18, pdu = 0x1bf910, orig_pdu = 0xa3500,
rw = 1, exact = 1, status = 0, index = 0, oldmode = 0, next = 0x0,
reqinfo = 0x1a9758, requests = 0x0, treecache = 0x0, bulkcache = 0x0,
treecache_len = 0, treecache_num = -1, cache_store = 0x0, vbcount = 0}
(gdb) p *asp->session
$38 = {version = -1, retries = 5, timeout = 1000000, flags = 0,
subsession = 0x0, next = 0x0, peername = 0x0, remote_port = 0,
localname = 0x0, local_port = 0, authenticator = 0,
callback = 0x18c84 <handle_snmp_packet>, callback_magic = 0x0, s_errno =
0,
s_snmp_errno = 0, sessid = 5, community = 0x88d90 "", community_len = 0,
rcvMsgMaxSize = 65507, sndMsgMaxSize = 0, isAuthoritative = 1 '\001',
contextEngineID = 0x0, contextEngineIDLen = 0, engineBoots = 0,
engineTime = 0, contextName = 0x88da0 "", contextNameLen = 0,
securityEngineID = 0x0, securityEngineIDLen = 0, securityName = 0x0,
securityNameLen = 0, securityAuthProto = 0x89010, securityAuthProtoLen =
10,
securityAuthKey = '\0' <repeats 31 times>, securityAuthKeyLen = 0,
securityAuthLocalKey = 0x0, securityAuthLocalKeyLen = 0,
securityPrivProto = 0x89040, securityPrivProtoLen = 10,
securityPrivKey = '\0' <repeats 31 times>, securityPrivKeyLen = 0,
securityPrivLocalKey = 0x0, securityPrivLocalKeyLen = 0, securityModel =
3,
securityLevel = 1, securityInfo = 0x0, myvoid = 0x0}
(gdb) p *asp->pdu
$39 = {version = 1, command = 161, reqid = 1140618767, msgid = 0,
transid = 27241, sessid = 0, errstat = 0, errindex = 0, time = 0, flags =
0,
securityModel = 2, securityLevel = 1, msgParseModel = 0,
transport_data = 0x177090, transport_data_length = 16, tDomain = 0x64f70,
tDomainLen = 7, variables = 0x1ee2b8, community = 0x1e1958 "public",
community_len = 6, enterprise = 0x0, enterprise_length = 0, trap_type = 0,
specific_type = 0, agent_addr = "\000\000\000", contextEngineID = 0x0,
contextEngineIDLen = 0, contextName = 0x0, contextNameLen = 0,
securityEngineID = 0x0, securityEngineIDLen = 0, securityName = 0x0,
securityNameLen = 0, priority = 0, range_subid = 0, securityStateRef =
0x0}
(gdb) p netsnmp_processing_set
$40 = (struct netsnmp_agent_session_s *) 0x88bd0
(gdb) n
2941 if (netsnmp_processing_set) {
(gdb)
2963 netsnmp_add_queued(asp);
(gdb) si
0x00019ee8 2963 netsnmp_add_queued(asp);
(gdb)
netsnmp_add_queued (asp=0x18e640) at snmp_agent.c:1447
1447 if (NULL == netsnmp_agent_queued_list) {
(gdb) n
1449 return 1;
(gdb)
1456 asp_tmp = netsnmp_agent_queued_list;
(gdb) p netsnmp_agent_queued_list
$41 = (struct netsnmp_agent_session_s *) 0x1c6280
(gdb) p *netsnmp_agent_queued_list
$42 = {mode = 0, session = 0x88f18, pdu = 0x1c90d0, orig_pdu = 0x1c0a68,
rw = 1, exact = 1, status = 0, index = 0, oldmode = 0, next = 0x1b6318,
reqinfo = 0x1c2610, requests = 0x0, treecache = 0x0, bulkcache = 0x0,
treecache_len = 0, treecache_num = -1, cache_store = 0x0, vbcount = 0}
(gdb) p *netsnmp_agent_queued_list->pdu
$43 = {version = 1, command = 163, reqid = 612679711, msgid = 0,
transid = 27136, sessid = 0, errstat = 0, errindex = 0, time = 0, flags =
0,
securityModel = 2, securityLevel = 1, msgParseModel = 0,
transport_data = 0x1c9dc8, transport_data_length = 16, tDomain = 0x64f70,
tDomainLen = 7, variables = 0x89ad8, community = 0x1bf030 "public",
community_len = 6, enterprise = 0x0, enterprise_length = 0, trap_type = 0,
specific_type = 0, agent_addr = "\000\000\000", contextEngineID = 0x0,
contextEngineIDLen = 0, contextName = 0x0, contextNameLen = 0,
securityEngineID = 0x0, securityEngineIDLen = 0, securityName = 0x0,
securityNameLen = 0, priority = 0, range_subid = 0, securityStateRef =
0x0}
(gdb) p *netsnmp_agent_queued_list->session
$44 = {version = -1, retries = 5, timeout = 1000000, flags = 0,
subsession = 0x0, next = 0x0, peername = 0x0, remote_port = 0,
localname = 0x0, local_port = 0, authenticator = 0,
callback = 0x18c84 <handle_snmp_packet>, callback_magic = 0x0, s_errno =
0,
s_snmp_errno = 0, sessid = 5, community = 0x88d90 "", community_len = 0,
rcvMsgMaxSize = 65507, sndMsgMaxSize = 0, isAuthoritative = 1 '\001',
contextEngineID = 0x0, contextEngineIDLen = 0, engineBoots = 0,
engineTime = 0, contextName = 0x88da0 "", contextNameLen = 0,
securityEngineID = 0x0, securityEngineIDLen = 0, securityName = 0x0,
securityNameLen = 0, securityAuthProto = 0x89010, securityAuthProtoLen =
10,
securityAuthKey = '\0' <repeats 31 times>, securityAuthKeyLen = 0,
securityAuthLocalKey = 0x0, securityAuthLocalKeyLen = 0,
securityPrivProto = 0x89040, securityPrivProtoLen = 10,
securityPrivKey = '\0' <repeats 31 times>, securityPrivKeyLen = 0,
securityPrivLocalKey = 0x0, securityPrivLocalKeyLen = 0, securityModel =
3,
securityLevel = 1, securityInfo = 0x0, myvoid = 0x0}
(gdb) n
1461 if (asp_tmp == asp)
(gdb) p asp
$45 = (struct netsnmp_agent_session_s *) 0x18e640
(gdb) n
1467 if (NULL == asp_tmp->next)
(gdb) n
1468 asp_tmp->next = asp;
(gdb)
1457 for (; asp_tmp; asp_tmp = asp_tmp->next) {
(gdb)
1461 if (asp_tmp == asp)
(gdb)
1467 if (NULL == asp_tmp->next)
(gdb)
1468 asp_tmp->next = asp;
(gdb) until 1470
netsnmp_add_queued (asp=0x18e640) at snmp_agent.c:1471
1471 }
(gdb) n
netsnmp_handle_request (asp=0x18e640, status=560432) at snmp_agent.c:2964
2964 return 1;
(gdb) n
3005 }
(gdb)
_sess_process_packet (sessp=0x88d78, sp=0x88f18, isp=0x88ee0,
transport=0x88d30, opaque=0x125180, olength=1511944,
packetptr=0x1ca058
"0)\002\001\001\004\006public|\034\002\004C|v\017\002\001", length=43) at
snmp_api.c:5249
5249 if (pdu != NULL && pdu->securityStateRef &&
(gdb)
5268 if (!handled) {
(gdb)
5273 snmp_free_pdu(pdu);
(gdb)
5274 return 0;
(gdb)
5275 }
============================================================================
=========
-------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc. Do you grep through log files
for problems? Stop! Download the new AJAX search engine that makes
searching your log files as easy as surfing the web. DOWNLOAD SPLUNK!
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642
_______________________________________________
Net-snmp-coders mailing list
Net-snmp-coders@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/net-snmp-coders
