| /* |
| * AgentX utility routines |
| */ |
| |
| #include <net-snmp/net-snmp-config.h> |
| |
| #include <stdio.h> |
| #include <errno.h> |
| #if HAVE_STDLIB_H |
| #include <stdlib.h> |
| #endif |
| #if HAVE_STRING_H |
| #include <string.h> |
| #else |
| #include <strings.h> |
| #endif |
| #if HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #include <sys/types.h> |
| #if TIME_WITH_SYS_TIME |
| # include <sys/time.h> |
| # include <time.h> |
| #else |
| # if HAVE_SYS_TIME_H |
| # include <sys/time.h> |
| # else |
| # include <time.h> |
| # endif |
| #endif |
| |
| #if HAVE_NETINET_IN_H |
| #include <netinet/in.h> |
| #endif |
| |
| #include <net-snmp/net-snmp-includes.h> |
| #include <net-snmp/agent/net-snmp-agent-includes.h> |
| #include <net-snmp/agent/agent_index.h> |
| |
| #include "agentx/protocol.h" |
| #include "agentx/client.h" |
| #include "agentx/subagent.h" |
| |
| /* |
| * AgentX handling utility routines |
| * |
| * Mostly wrappers round, or re-writes of |
| * the SNMP equivalents |
| */ |
| |
| int |
| agentx_synch_input(int op, |
| netsnmp_session * session, |
| int reqid, netsnmp_pdu *pdu, void *magic) |
| { |
| struct synch_state *state = (struct synch_state *) magic; |
| |
| if (!state || reqid != state->reqid) { |
| return handle_agentx_packet(op, session, reqid, pdu, magic); |
| } |
| |
| DEBUGMSGTL(("agentx/subagent", "synching input, op 0x%02x\n", op)); |
| state->waiting = 0; |
| if (op == NETSNMP_CALLBACK_OP_RECEIVED_MESSAGE) { |
| if (pdu->command == AGENTX_MSG_RESPONSE) { |
| state->pdu = snmp_clone_pdu(pdu); |
| state->status = STAT_SUCCESS; |
| session->s_snmp_errno = SNMPERR_SUCCESS; |
| |
| /* |
| * Synchronise sysUpTime with the master agent |
| */ |
| netsnmp_set_agent_uptime(pdu->time); |
| } |
| } else if (op == NETSNMP_CALLBACK_OP_TIMED_OUT) { |
| state->pdu = NULL; |
| state->status = STAT_TIMEOUT; |
| session->s_snmp_errno = SNMPERR_TIMEOUT; |
| } else if (op == NETSNMP_CALLBACK_OP_DISCONNECT) { |
| return handle_agentx_packet(op, session, reqid, pdu, magic); |
| } |
| |
| return 1; |
| } |
| |
| |
| |
| int |
| agentx_synch_response(netsnmp_session * ss, netsnmp_pdu *pdu, |
| netsnmp_pdu **response) |
| { |
| return snmp_synch_response_cb(ss, pdu, response, agentx_synch_input); |
| } |
| |
| |
| /* |
| * AgentX PofE convenience functions |
| */ |
| |
| int |
| agentx_open_session(netsnmp_session * ss) |
| { |
| netsnmp_pdu *pdu, *response; |
| extern oid version_sysoid[]; |
| extern int version_sysoid_len; |
| u_long timeout; |
| |
| DEBUGMSGTL(("agentx/subagent", "opening session \n")); |
| if (ss == NULL || !IS_AGENTX_VERSION(ss->version)) { |
| return 0; |
| } |
| |
| pdu = snmp_pdu_create(AGENTX_MSG_OPEN); |
| if (pdu == NULL) |
| return 0; |
| timeout = netsnmp_ds_get_int(NETSNMP_DS_APPLICATION_ID, |
| NETSNMP_DS_AGENT_AGENTX_TIMEOUT); |
| if (timeout < 0) |
| pdu->time = 0; |
| else |
| /* for master TIMEOUT is usec, but Agentx Open specifies sec */ |
| pdu->time = timeout/ONE_SEC; |
| |
| snmp_add_var(pdu, version_sysoid, version_sysoid_len, |
| 's', "Net-SNMP AgentX sub-agent"); |
| |
| if (agentx_synch_response(ss, pdu, &response) != STAT_SUCCESS) |
| return 0; |
| |
| if (!response) |
| return 0; |
| |
| if (response->errstat != SNMP_ERR_NOERROR) { |
| snmp_free_pdu(response); |
| return 0; |
| } |
| |
| ss->sessid = response->sessid; |
| snmp_free_pdu(response); |
| |
| DEBUGMSGTL(("agentx/subagent", "open \n")); |
| return 1; |
| } |
| |
| int |
| agentx_close_session(netsnmp_session * ss, int why) |
| { |
| netsnmp_pdu *pdu, *response; |
| DEBUGMSGTL(("agentx/subagent", "closing session\n")); |
| |
| if (ss == NULL || !IS_AGENTX_VERSION(ss->version)) { |
| return 0; |
| } |
| |
| pdu = snmp_pdu_create(AGENTX_MSG_CLOSE); |
| if (pdu == NULL) |
| return 0; |
| pdu->time = 0; |
| pdu->errstat = why; |
| pdu->sessid = ss->sessid; |
| |
| if (agentx_synch_response(ss, pdu, &response) == STAT_SUCCESS) |
| snmp_free_pdu(response); |
| DEBUGMSGTL(("agentx/subagent", "closed\n")); |
| |
| return 1; |
| } |
| |
| int |
| agentx_register(netsnmp_session * ss, oid start[], size_t startlen, |
| int priority, int range_subid, oid range_ubound, |
| int timeout, u_char flags, const char *contextName) |
| { |
| netsnmp_pdu *pdu, *response; |
| |
| DEBUGMSGTL(("agentx/subagent", "registering: ")); |
| DEBUGMSGOIDRANGE(("agentx/subagent", start, startlen, range_subid, |
| range_ubound)); |
| DEBUGMSG(("agentx/subagent", "\n")); |
| |
| if (ss == NULL || !IS_AGENTX_VERSION(ss->version)) { |
| return 0; |
| } |
| |
| pdu = snmp_pdu_create(AGENTX_MSG_REGISTER); |
| if (pdu == NULL) { |
| return 0; |
| } |
| pdu->time = timeout; |
| pdu->priority = priority; |
| pdu->sessid = ss->sessid; |
| pdu->range_subid = range_subid; |
| if (contextName) { |
| pdu->flags |= AGENTX_MSG_FLAG_NON_DEFAULT_CONTEXT; |
| pdu->community = (u_char *) strdup(contextName); |
| pdu->community_len = strlen(contextName); |
| } |
| |
| if (flags & FULLY_QUALIFIED_INSTANCE) { |
| pdu->flags |= AGENTX_MSG_FLAG_INSTANCE_REGISTER; |
| } |
| |
| if (range_subid) { |
| snmp_pdu_add_variable(pdu, start, startlen, ASN_OBJECT_ID, |
| (u_char *) start, startlen * sizeof(oid)); |
| pdu->variables->val.objid[range_subid - 1] = range_ubound; |
| } else { |
| snmp_add_null_var(pdu, start, startlen); |
| } |
| |
| if (agentx_synch_response(ss, pdu, &response) != STAT_SUCCESS) { |
| DEBUGMSGTL(("agentx/subagent", "registering failed!\n")); |
| return 0; |
| } |
| |
| if (response->errstat != SNMP_ERR_NOERROR) { |
| snmp_log(LOG_ERR,"registering pdu failed: %ld!\n", response->errstat); |
| snmp_free_pdu(response); |
| return 0; |
| } |
| |
| snmp_free_pdu(response); |
| DEBUGMSGTL(("agentx/subagent", "registered\n")); |
| return 1; |
| } |
| |
| int |
| agentx_unregister(netsnmp_session * ss, oid start[], size_t startlen, |
| int priority, int range_subid, oid range_ubound, |
| const char *contextName) |
| { |
| netsnmp_pdu *pdu, *response; |
| |
| if (ss == NULL || !IS_AGENTX_VERSION(ss->version)) { |
| return 0; |
| } |
| |
| DEBUGMSGTL(("agentx/subagent", "unregistering: ")); |
| DEBUGMSGOIDRANGE(("agentx/subagent", start, startlen, range_subid, |
| range_ubound)); |
| DEBUGMSG(("agentx/subagent", "\n")); |
| pdu = snmp_pdu_create(AGENTX_MSG_UNREGISTER); |
| if (pdu == NULL) { |
| return 0; |
| } |
| pdu->time = 0; |
| pdu->priority = priority; |
| pdu->sessid = ss->sessid; |
| pdu->range_subid = range_subid; |
| if (contextName) { |
| pdu->flags |= AGENTX_MSG_FLAG_NON_DEFAULT_CONTEXT; |
| pdu->community = (u_char *) strdup(contextName); |
| pdu->community_len = strlen(contextName); |
| } |
| |
| if (range_subid) { |
| snmp_pdu_add_variable(pdu, start, startlen, ASN_OBJECT_ID, |
| (u_char *) start, startlen * sizeof(oid)); |
| pdu->variables->val.objid[range_subid - 1] = range_ubound; |
| } else { |
| snmp_add_null_var(pdu, start, startlen); |
| } |
| |
| if (agentx_synch_response(ss, pdu, &response) != STAT_SUCCESS) |
| return 0; |
| |
| if (response->errstat != SNMP_ERR_NOERROR) { |
| snmp_free_pdu(response); |
| return 0; |
| } |
| |
| snmp_free_pdu(response); |
| DEBUGMSGTL(("agentx/subagent", "unregistered\n")); |
| return 1; |
| } |
| |
| netsnmp_variable_list * |
| agentx_register_index(netsnmp_session * ss, |
| netsnmp_variable_list * varbind, int flags) |
| { |
| netsnmp_pdu *pdu, *response; |
| netsnmp_variable_list *varbind2; |
| |
| if (ss == NULL || !IS_AGENTX_VERSION(ss->version)) { |
| return NULL; |
| } |
| |
| /* |
| * Make a copy of the index request varbind |
| * for the AgentX request PDU |
| * (since the pdu structure will be freed) |
| */ |
| varbind2 = |
| (netsnmp_variable_list *) malloc(sizeof(netsnmp_variable_list)); |
| if (varbind2 == NULL) |
| return NULL; |
| if (snmp_clone_var(varbind, varbind2)) { |
| snmp_free_varbind(varbind2); |
| return NULL; |
| } |
| if (varbind2->val.string == NULL) |
| varbind2->val.string = varbind2->buf; /* ensure it points somewhere */ |
| |
| pdu = snmp_pdu_create(AGENTX_MSG_INDEX_ALLOCATE); |
| if (pdu == NULL) { |
| snmp_free_varbind(varbind2); |
| return NULL; |
| } |
| pdu->time = 0; |
| pdu->sessid = ss->sessid; |
| if (flags == ALLOCATE_ANY_INDEX) |
| pdu->flags |= AGENTX_MSG_FLAG_ANY_INSTANCE; |
| if (flags == ALLOCATE_NEW_INDEX) |
| pdu->flags |= AGENTX_MSG_FLAG_NEW_INSTANCE; |
| |
| /* |
| * Just send a single index request varbind. |
| * Although the AgentX protocol supports |
| * multiple index allocations in a single |
| * request, the model used in the net-snmp agent |
| * doesn't currently take advantage of this. |
| * I believe this is our prerogative - just as |
| * long as the master side Index request handler |
| * can cope with multiple index requests. |
| */ |
| pdu->variables = varbind2; |
| |
| if (agentx_synch_response(ss, pdu, &response) != STAT_SUCCESS) |
| return NULL; |
| |
| if (response->errstat != SNMP_ERR_NOERROR) { |
| snmp_free_pdu(response); |
| return NULL; |
| } |
| |
| /* |
| * Unlink the (single) response varbind to return |
| * to the main driving index request routine. |
| * |
| * This is a memory leak, as nothing will ever |
| * release this varbind. If this becomes a problem, |
| * we'll need to keep a list of these here, and |
| * free the memory in the "index release" routine. |
| * But the master side never frees these either (by |
| * design, since it still needs them), so expecting |
| * the subagent to is discrimination, pure & simple :-) |
| */ |
| varbind2 = response->variables; |
| response->variables = NULL; |
| snmp_free_pdu(response); |
| return varbind2; |
| } |
| |
| int |
| agentx_unregister_index(netsnmp_session * ss, |
| netsnmp_variable_list * varbind) |
| { |
| netsnmp_pdu *pdu, *response; |
| netsnmp_variable_list *varbind2; |
| |
| if (ss == NULL || !IS_AGENTX_VERSION(ss->version)) { |
| return -1; |
| } |
| |
| /* |
| * Make a copy of the index request varbind |
| * for the AgentX request PDU |
| * (since the pdu structure will be freed) |
| */ |
| varbind2 = |
| (netsnmp_variable_list *) malloc(sizeof(netsnmp_variable_list)); |
| if (varbind2 == NULL) |
| return -1; |
| if (snmp_clone_var(varbind, varbind2)) { |
| snmp_free_varbind(varbind2); |
| return -1; |
| } |
| |
| pdu = snmp_pdu_create(AGENTX_MSG_INDEX_DEALLOCATE); |
| if (pdu == NULL) { |
| snmp_free_varbind(varbind2); |
| return -1; |
| } |
| pdu->time = 0; |
| pdu->sessid = ss->sessid; |
| |
| /* |
| * Just send a single index release varbind. |
| * (as above) |
| */ |
| pdu->variables = varbind2; |
| |
| if (agentx_synch_response(ss, pdu, &response) != STAT_SUCCESS) |
| return -1; |
| |
| if (response->errstat != SNMP_ERR_NOERROR) { |
| snmp_free_pdu(response); |
| return -1; /* XXX - say why */ |
| } |
| |
| snmp_free_pdu(response); |
| return SNMP_ERR_NOERROR; |
| } |
| |
| int |
| agentx_add_agentcaps(netsnmp_session * ss, |
| const oid * agent_cap, size_t agent_caplen, |
| const char *descr) |
| { |
| netsnmp_pdu *pdu, *response; |
| |
| if (ss == NULL || !IS_AGENTX_VERSION(ss->version)) { |
| return 0; |
| } |
| |
| pdu = snmp_pdu_create(AGENTX_MSG_ADD_AGENT_CAPS); |
| if (pdu == NULL) |
| return 0; |
| pdu->time = 0; |
| pdu->sessid = ss->sessid; |
| snmp_add_var(pdu, agent_cap, agent_caplen, 's', descr); |
| |
| if (agentx_synch_response(ss, pdu, &response) != STAT_SUCCESS) |
| return 0; |
| |
| if (response->errstat != SNMP_ERR_NOERROR) { |
| snmp_free_pdu(response); |
| return 0; |
| } |
| |
| snmp_free_pdu(response); |
| return 1; |
| } |
| |
| int |
| agentx_remove_agentcaps(netsnmp_session * ss, |
| const oid * agent_cap, size_t agent_caplen) |
| { |
| netsnmp_pdu *pdu, *response; |
| |
| if (ss == NULL || !IS_AGENTX_VERSION(ss->version)) { |
| return 0; |
| } |
| |
| pdu = snmp_pdu_create(AGENTX_MSG_REMOVE_AGENT_CAPS); |
| if (pdu == NULL) |
| return 0; |
| pdu->time = 0; |
| pdu->sessid = ss->sessid; |
| snmp_add_null_var(pdu, agent_cap, agent_caplen); |
| |
| if (agentx_synch_response(ss, pdu, &response) != STAT_SUCCESS) |
| return 0; |
| |
| if (response->errstat != SNMP_ERR_NOERROR) { |
| snmp_free_pdu(response); |
| return 0; |
| } |
| |
| snmp_free_pdu(response); |
| return 1; |
| } |
| |
| int |
| agentx_send_ping(netsnmp_session * ss) |
| { |
| netsnmp_pdu *pdu, *response; |
| |
| if (ss == NULL || !IS_AGENTX_VERSION(ss->version)) { |
| return 0; |
| } |
| |
| pdu = snmp_pdu_create(AGENTX_MSG_PING); |
| if (pdu == NULL) |
| return 0; |
| pdu->time = 0; |
| pdu->sessid = ss->sessid; |
| |
| if (agentx_synch_response(ss, pdu, &response) != STAT_SUCCESS) |
| return 0; |
| |
| if (response->errstat != SNMP_ERR_NOERROR) { |
| snmp_free_pdu(response); |
| return 0; |
| } |
| |
| snmp_free_pdu(response); |
| return 1; |
| } |
