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net-snmp
net-snmp-5.7.3-fix-agentx-freezing-on-timeout.p...
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File net-snmp-5.7.3-fix-agentx-freezing-on-timeout.patch of Package net-snmp
commit 793d596838ff7cb48a73b675d62897c56c9e62df Author: Jan Safranek <jsafranek@users.sourceforge.net> Date: Tue Jul 2 14:32:56 2013 +0200 From: Jiri Cervenka: snmpd: Fixed agentx crashing and/or freezing on timeout. Queued requests are dropped gracefuly. diff --git a/agent/mibgroup/agentx/master_admin.c b/agent/mibgroup/agentx/master_admin.c index 999128ac6..4b421049a 100644 --- a/agent/mibgroup/agentx/master_admin.c +++ b/agent/mibgroup/agentx/master_admin.c @@ -158,6 +158,7 @@ close_agentx_session(netsnmp_session * session, int sessid) for (sp = session->subsession; sp != NULL; sp = sp->next) { if (sp->sessid == sessid) { + netsnmp_remove_delegated_requests_for_session(sp); unregister_mibs_by_session(sp); unregister_index_by_session(sp); unregister_sysORTable_by_session(sp); diff --git a/agent/snmp_agent.c b/agent/snmp_agent.c index 1261c5332..51eb287c2 100644 --- a/agent/snmp_agent.c +++ b/agent/snmp_agent.c @@ -1415,6 +1415,7 @@ init_agent_snmp_session(netsnmp_session * session, netsnmp_pdu *pdu) asp->treecache_num = -1; asp->treecache_len = 0; asp->reqinfo = SNMP_MALLOC_TYPEDEF(netsnmp_agent_request_info); + asp->flags = SNMP_AGENT_FLAGS_NONE; DEBUGMSGTL(("verbose:asp", "asp %p reqinfo %p created\n", asp, asp->reqinfo)); @@ -1463,6 +1464,9 @@ netsnmp_check_for_delegated(netsnmp_agent_session *asp) if (NULL == asp->treecache) return 0; + + if (asp->flags & SNMP_AGENT_FLAGS_CANCEL_IN_PROGRESS) + return 0; for (i = 0; i <= asp->treecache_num; i++) { for (request = asp->treecache[i].requests_begin; request; @@ -1541,39 +1545,48 @@ int netsnmp_remove_delegated_requests_for_session(netsnmp_session *sess) { netsnmp_agent_session *asp; - int count = 0; + int total_count = 0; for (asp = agent_delegated_list; asp; asp = asp->next) { /* * check each request */ + int i; + int count = 0; netsnmp_request_info *request; - for(request = asp->requests; request; request = request->next) { - /* - * check session - */ - netsnmp_assert(NULL!=request->subtree); - if(request->subtree->session != sess) - continue; + for (i = 0; i <= asp->treecache_num; i++) { + for (request = asp->treecache[i].requests_begin; request; + request = request->next) { + /* + * check session + */ + netsnmp_assert(NULL!=request->subtree); + if(request->subtree->session != sess) + continue; - /* - * matched! mark request as done - */ - netsnmp_request_set_error(request, SNMP_ERR_GENERR); - ++count; + /* + * matched! mark request as done + */ + netsnmp_request_set_error(request, SNMP_ERR_GENERR); + ++count; + } + } + if (count) { + asp->flags |= SNMP_AGENT_FLAGS_CANCEL_IN_PROGRESS; + total_count += count; } } /* * if we found any, that request may be finished now */ - if(count) { + if(total_count) { DEBUGMSGTL(("snmp_agent", "removed %d delegated request(s) for session " - "%8p\n", count, sess)); - netsnmp_check_outstanding_agent_requests(); + "%8p\n", total_count, sess)); + netsnmp_check_delegated_requests(); } - return count; + return total_count; } int @@ -2745,19 +2758,11 @@ handle_var_requests(netsnmp_agent_session *asp) return final_status; } -/* - * loop through our sessions known delegated sessions and check to see - * if they've completed yet. If there are no more delegated sessions, - * check for and process any queued requests - */ void -netsnmp_check_outstanding_agent_requests(void) +netsnmp_check_delegated_requests(void) { netsnmp_agent_session *asp, *prev_asp = NULL, *next_asp = NULL; - /* - * deal with delegated requests - */ for (asp = agent_delegated_list; asp; asp = next_asp) { next_asp = asp->next; /* save in case we clean up asp */ if (!netsnmp_check_for_delegated(asp)) { @@ -2796,6 +2801,22 @@ netsnmp_check_outstanding_agent_requests(void) prev_asp = asp; } } +} + +/* + * loop through our sessions known delegated sessions and check to see + * if they've completed yet. If there are no more delegated sessions, + * check for and process any queued requests + */ +void +netsnmp_check_outstanding_agent_requests(void) +{ + netsnmp_agent_session *asp; + + /* + * deal with delegated requests + */ + netsnmp_check_delegated_requests(); /* * if we are processing a set and there are more delegated @@ -2825,7 +2846,8 @@ netsnmp_check_outstanding_agent_requests(void) netsnmp_processing_set = netsnmp_agent_queued_list; DEBUGMSGTL(("snmp_agent", "SET request remains queued while " - "delegated requests finish, asp = %8p\n", asp)); + "delegated requests finish, asp = %8p\n", + agent_delegated_list)); break; } #endif /* NETSNMP_NO_WRITE_SUPPORT */ @@ -2886,6 +2908,10 @@ check_delayed_request(netsnmp_agent_session *asp) case SNMP_MSG_GETBULK: case SNMP_MSG_GETNEXT: netsnmp_check_all_requests_status(asp, 0); + if (asp->flags & SNMP_AGENT_FLAGS_CANCEL_IN_PROGRESS) { + DEBUGMSGTL(("snmp_agent","canceling next walk for asp %p\n", asp)); + break; + } handle_getnext_loop(asp); if (netsnmp_check_for_delegated(asp) && netsnmp_check_transaction_id(asp->pdu->transid) != diff --git a/include/net-snmp/agent/snmp_agent.h b/include/net-snmp/agent/snmp_agent.h index aad8837a8..43f4fff61 100644 --- a/include/net-snmp/agent/snmp_agent.h +++ b/include/net-snmp/agent/snmp_agent.h @@ -32,6 +32,9 @@ extern "C" { #define SNMP_MAX_PDU_SIZE 64000 /* local constraint on PDU size sent by agent * (see also SNMP_MAX_MSG_SIZE in snmp_api.h) */ +#define SNMP_AGENT_FLAGS_NONE 0x0 +#define SNMP_AGENT_FLAGS_CANCEL_IN_PROGRESS 0x1 + /* * If non-zero, causes the addresses of peers to be logged when receptions * occur. @@ -205,6 +208,7 @@ extern "C" { int treecache_num; /* number of current cache entries */ netsnmp_cachemap *cache_store; int vbcount; + int flags; } netsnmp_agent_session; /* @@ -240,6 +244,7 @@ extern "C" { int init_master_agent(void); void shutdown_master_agent(void); int agent_check_and_process(int block); + void netsnmp_check_delegated_requests(void); void netsnmp_check_outstanding_agent_requests(void); int netsnmp_request_set_error(netsnmp_request_info *request,
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