/*
* Open a session to the master agent.
*/
int
subagent_open_master_session(void)
{
netsnmp_transport *t;
netsnmp_session sess;
DEBUGMSGTL(("agentx/subagent", "opening session...\n"));
if (main_session) {
snmp_log(LOG_WARNING,
"AgentX session to master agent attempted to be re-opened.");
return -1;
}
snmp_sess_init(&sess);
sess.version = AGENTX_VERSION_1;
sess.retries = SNMP_DEFAULT_RETRIES;
sess.timeout = SNMP_DEFAULT_TIMEOUT;
sess.flags |= SNMP_FLAGS_STREAM_SOCKET;
sess.callback = handle_agentx_packet;
sess.authenticator = NULL;
t = netsnmp_transport_open_client(
"agentx", netsnmp_ds_get_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCKET));
if (t == NULL) {
/*
* Diagnose snmp_open errors with the input
* netsnmp_session pointer.
*/
if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_NO_CONNECTION_WARNINGS)) {
char buf[1024];
const char *socket =
netsnmp_ds_get_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCKET);
snprintf(buf, sizeof(buf), "Warning: "
"Failed to connect to the agentx master agent (%s)",
socket ? socket : "[NIL]");
if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_NO_ROOT_ACCESS)) {
netsnmp_sess_log_error(LOG_WARNING, buf, &sess);
} else {
snmp_sess_perror(buf, &sess);
}
}
return -1;
}
main_session =
snmp_add_full(&sess, t, NULL, agentx_parse, NULL, NULL,
agentx_realloc_build, agentx_check_packet, NULL);
if (main_session == NULL) {
if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_NO_CONNECTION_WARNINGS)) {
char buf[1024];
snprintf(buf, sizeof(buf), "Error: "
"Failed to create the agentx master agent session (%s)",
netsnmp_ds_get_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCKET));
snmp_sess_perror(buf, &sess);
}
netsnmp_transport_free(t);
return -1;
}
/*
* I don't know why 1 is success instead of the usual 0 = noerr,
* but that's what the function returns.
*/
if (1 != agentx_open_session(main_session)) {
snmp_close(main_session);
main_session = NULL;
return -1;
}
if (add_trap_session(main_session, AGENTX_MSG_NOTIFY, 1,
AGENTX_VERSION_1)) {
DEBUGMSGTL(("agentx/subagent", " trap session registered OK\n"));
} else {
DEBUGMSGTL(("agentx/subagent",
"trap session registration failed\n"));
snmp_close(main_session);
main_session = NULL;
return -1;
}
agentx_register_callbacks(main_session);
snmp_call_callbacks(SNMP_CALLBACK_APPLICATION,
SNMPD_CALLBACK_INDEX_START, (void *) main_session);
snmp_log(LOG_INFO, "NET-SNMP version %s AgentX subagent connected\n",
netsnmp_get_version());
DEBUGMSGTL(("agentx/subagent", "opening session... DONE (%p)\n",
main_session));
return 0;
}
/*
* Open a session to the master agent.
*/
int
subagent_open_master_session(void)
{
netsnmp_session sess;
DEBUGMSGTL(("agentx/subagent", "opening session...\n"));
if (main_session) {
snmp_log(LOG_WARNING,
"AgentX session to master agent attempted to be re-opened.");
return -1;
}
snmp_sess_init(&sess);
sess.version = AGENTX_VERSION_1;
sess.retries = SNMP_DEFAULT_RETRIES;
sess.timeout = SNMP_DEFAULT_TIMEOUT;
sess.flags |= SNMP_FLAGS_STREAM_SOCKET;
if (netsnmp_ds_get_string(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_X_SOCKET)) {
sess.peername =
netsnmp_ds_get_string(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_X_SOCKET);
} else {
sess.peername = strdup(AGENTX_SOCKET);
}
sess.local_port = 0; /* client */
sess.remote_port = AGENTX_PORT; /* default port */
sess.callback = handle_agentx_packet;
sess.authenticator = NULL;
main_session = snmp_open_ex(&sess, NULL, agentx_parse, NULL, NULL,
agentx_realloc_build, agentx_check_packet);
if (main_session == NULL) {
/*
* Diagnose snmp_open errors with the input
* netsnmp_session pointer.
*/
if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_NO_CONNECTION_WARNINGS)) {
if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_NO_ROOT_ACCESS)) {
netsnmp_sess_log_error(LOG_WARNING,
"Error: Failed to connect to the agentx master agent",
&sess);
} else {
snmp_sess_perror
("Error: Failed to connect to the agentx master agent",
&sess);
}
}
return -1;
}
if (agentx_open_session(main_session) < 0) {
snmp_close(main_session);
main_session = NULL;
return -1;
}
if (add_trap_session(main_session, AGENTX_MSG_NOTIFY, 1,
AGENTX_VERSION_1)) {
DEBUGMSGTL(("agentx/subagent", " trap session registered OK\n"));
} else {
DEBUGMSGTL(("agentx/subagent",
"trap session registration failed\n"));
snmp_close(main_session);
main_session = NULL;
return -1;
}
agentx_register_callbacks(main_session);
snmp_call_callbacks(SNMP_CALLBACK_APPLICATION,
SNMPD_CALLBACK_INDEX_START, (void *) main_session);
DEBUGMSGTL(("agentx/subagent", "opening session... DONE (%p)\n",
main_session));
return 0;
}
