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openSUSE:Leap:15.5:Update
net-snmp.22256
net-snmp-5.7.3-snmptrapd-add-forwarder-info.patch
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File net-snmp-5.7.3-snmptrapd-add-forwarder-info.patch of Package net-snmp.22256
Index: net-snmp-5.7.3/apps/snmptrapd_handlers.c =================================================================== --- net-snmp-5.7.3.orig/apps/snmptrapd_handlers.c +++ net-snmp-5.7.3/apps/snmptrapd_handlers.c @@ -884,6 +884,13 @@ int forward_handler( netsnmp_pdu netsnmp_pdu *pdu2; char buf[BUFSIZ], *cp; + int last_snmpTrapAddress_index = -1; /* .0 in .1.3.6.1.6.3.18.1.3 .0 */ + const oid snmpTrapAddress_oid[] = { 1,3,6,1,6,3,18,1,3}; /* snmpTrapAddress_oid.0 is also defined as agentaddr_oid */ +/* const oid agentaddr_oid[] = { 1,3,6,1,6,3,18,1,3,0}; */ /* this is snmpTrapAddress_oid.0 */ + oid forwarder_oid[] = { 1,3,6,1,6,3,18,1,3,0}; /* each forwarder will add this OID with changed last index */ + const size_t snmpTrapAddress_oid_size = OID_LENGTH(snmpTrapAddress_oid); + const size_t forwarder_oid_len = OID_LENGTH(forwarder_oid); + DEBUGMSGTL(( "snmptrapd", "forward_handler (%s)\n", handler->token)); snmp_sess_init( &session ); @@ -904,6 +911,70 @@ int forward_handler( netsnmp_pdu INFORMS which may require engineID probing */ pdu2 = snmp_clone_pdu(pdu); + + netsnmp_indexed_addr_pair *addr_pair1 = NULL; + struct sockaddr_in *to1 = NULL; + + if (netsnmp_ds_get_boolean(NETSNMP_DS_LIBRARY_ID, + NETSNMP_DS_LIB_ADD_FORWARDER_INFO)) { + if (pdu && pdu->transport_data) { + addr_pair1 = (netsnmp_indexed_addr_pair *) pdu->transport_data; + + if (addr_pair1 != NULL) + to1 = (struct sockaddr_in *) &(addr_pair1->remote_addr); /* get the IP address of the host, that this trap was sent to = this forwarder's IP address */ + } + + if (NULL != to1) + { + char agent_addr[5] = "0000"; /* store the decoded IP address here */ + agent_addr[3] = (to1->sin_addr.s_addr >> 24) & 0xFF; + agent_addr[2] = (to1->sin_addr.s_addr >> 16) & 0xFF; + agent_addr[1] = (to1->sin_addr.s_addr >> 8) & 0xFF; + agent_addr[0] = (to1->sin_addr.s_addr) & 0xFF; + if (pdu2->agent_addr[0] == 0 && pdu2->agent_addr[1] == 0 && pdu2->agent_addr[2] == 0 && pdu2->agent_addr[3] == 0) //agent_addr is "0.0.0.0" + { /* there was no agent address defined in PDU */ + memcpy (pdu2->agent_addr, agent_addr, 4); /* copy the forwarding agent IP address from the transport socket. */ + } + else + { /* there is already agent address in PDU*/ + /* do nothing */ + } + + netsnmp_variable_list *var = NULL; + netsnmp_variable_list *vblist = NULL; + vblist = pdu2->variables; + + /* go via all OIDs in the payload, to see if the info about forwarder is already there - look for snmpTrapAddress_oid.x */ + for (var = vblist; var; var = var->next_variable) { + if (var) { + if (!snmp_oid_ncompare(var->name, var->name_length, + snmpTrapAddress_oid, snmpTrapAddress_oid_size, snmpTrapAddress_oid_size)) + { + int my_last_snmpTrapAddress_index = var->name[var->name_length]; /* .x in .1.3.6.1.6.3.18.1.3.x */ + if (last_snmpTrapAddress_index < my_last_snmpTrapAddress_index) + last_snmpTrapAddress_index = my_last_snmpTrapAddress_index; /* in case the indexes are out-of-order in PDU */ + + forwarder_oid [forwarder_oid_len-1] = last_snmpTrapAddress_index+1; // indexing starts from zero, so at last index, insert next number for forwarder IP address + } + } /* var is not NULL */ + } /* for var in vblist */ + + + forwarder_oid [forwarder_oid_len-1] = last_snmpTrapAddress_index+1; /* change the last index of this OID to the next avaiable number. Indexing starts from zero, that is why forwarder_oid_len-1 */ + + + /*add forwarder IP address as OID to trap payload */ + +/* snmp_pdu_add_variable(pdu2, forwarder_oid, forwarder_oid_len, + ASN_IPADDRESS, (u_char*)&pdu2->agent_addr, 4); */ + + /* use the value from transport, so if v1 PDU is sent, the same IP is not duplicated + - you want every forwarder to add this OID with its own IP address */ + snmp_pdu_add_variable(pdu2, forwarder_oid, forwarder_oid_len, + ASN_IPADDRESS, (u_char*)agent_addr, 4); + } + } /* NETSNMP_DS_LIB_ADD_FORWARDER_INFO is defined as true */ + if (pdu2->transport_data) { free(pdu2->transport_data); pdu2->transport_data = NULL; Index: net-snmp-5.7.3/apps/snmptrapd.c =================================================================== --- net-snmp-5.7.3.orig/apps/snmptrapd.c +++ net-snmp-5.7.3/apps/snmptrapd.c @@ -245,6 +245,7 @@ usage(void) fprintf(stderr, "\tWeb: http://www.net-snmp.org/\n"); fprintf(stderr, "\tEmail: net-snmp-coders@lists.sourceforge.net\n"); fprintf(stderr, "\n"); + fprintf(stderr, " --add-forwarder-info\tadd info to SNMP payload about forwarder\n"); fprintf(stderr, " -a\t\t\tignore authentication failure traps\n"); fprintf(stderr, " -A\t\t\tappend to log file rather than truncating it\n"); fprintf(stderr, " -c FILE\t\tread FILE as a configuration file\n"); @@ -555,6 +556,15 @@ parse_config_outputOption(const char *to } } +void +parse_config_addForwarderInfo(const char *token, char *cptr) +{ + if (netsnmp_ds_parse_boolean(cptr) == 1) { + netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, + NETSNMP_DS_LIB_ADD_FORWARDER_INFO, 1); + } +} + static void snmptrapd_main_loop(void) { @@ -718,6 +728,11 @@ main(int argc, char *argv[]) register_config_handler("snmptrapd", "outputOption", parse_config_outputOption, NULL, "string"); + netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, + NETSNMP_DS_LIB_ADD_FORWARDER_INFO, 0); + register_config_handler("snmptrapd", "addForwarderInfo", + parse_config_addForwarderInfo, NULL, "(1|yes|true|0|no|false)"); + /* * Add some options if they are available. */ @@ -748,6 +763,11 @@ main(int argc, char *argv[]) version(); exit(0); } + if (strcasecmp(optarg, "add-forwarder-info") == 0) { + netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, + NETSNMP_DS_LIB_ADD_FORWARDER_INFO, 1); + break; + } handle_long_opt(optarg); break; Index: net-snmp-5.7.3/include/net-snmp/library/default_store.h =================================================================== --- net-snmp-5.7.3.orig/include/net-snmp/library/default_store.h +++ net-snmp-5.7.3/include/net-snmp/library/default_store.h @@ -94,6 +94,7 @@ extern "C" { #define NETSNMP_DS_LIB_TSM_USE_PREFIX 39 /* TSM's simple security name mapping */ #define NETSNMP_DS_LIB_DONT_LOAD_HOST_FILES 40 /* don't read host.conf files */ #define NETSNMP_DS_LIB_DNSSEC_WARN_ONLY 41 /* tread DNSSEC errors as warnings */ +#define NETSNMP_DS_LIB_ADD_FORWARDER_INFO 42 /* add info about forwarder to SNMP packets */ #define NETSNMP_DS_LIB_MAX_BOOL_ID 48 /* match NETSNMP_DS_MAX_SUBIDS */ /*
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