/*
* 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;
}
void
real_init_master(void)
{
netsnmp_session sess, *session = NULL;
char *agentx_sockets;
char *cp1;
if (netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_ROLE) != MASTER_AGENT)
return;
if (netsnmp_ds_get_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCKET)) {
agentx_sockets = strdup(netsnmp_ds_get_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCKET));
#ifdef NETSNMP_AGENTX_DOM_SOCK_ONLY
if (agentx_sockets[0] != '/') {
/* unix:/path */
if (agentx_sockets[5] != '/') {
snmp_log(LOG_ERR,
"Error: %s transport is not supported, disabling agentx/master.\n", agentx_sockets);
SNMP_FREE(agentx_sockets);
return;
}
}
#endif
} else {
agentx_sockets = strdup("");
}
DEBUGMSGTL(("agentx/master", "initializing...\n"));
snmp_sess_init(&sess);
sess.version = AGENTX_VERSION_1;
sess.flags |= SNMP_FLAGS_STREAM_SOCKET;
sess.timeout = netsnmp_ds_get_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_AGENTX_TIMEOUT);
sess.retries = netsnmp_ds_get_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_AGENTX_RETRIES);
#ifdef NETSNMP_TRANSPORT_UNIX_DOMAIN
{
int agentx_dir_perm =
netsnmp_ds_get_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_DIR_PERM);
if (agentx_dir_perm == 0)
agentx_dir_perm = NETSNMP_AGENT_DIRECTORY_MODE;
netsnmp_unix_create_path_with_mode(agentx_dir_perm);
}
#endif
cp1 = agentx_sockets;
while (cp1) {
netsnmp_transport *t;
/*
* If the AgentX socket string contains multiple descriptors,
* then pick this apart and handle them one by one.
*
*/
sess.peername = cp1;
cp1 = strchr(sess.peername, ',');
if (cp1 != NULL) {
*cp1++ = '\0';
}
/*
* Let 'snmp_open' interpret the descriptor.
*/
sess.local_port = AGENTX_PORT; /* Indicate server & set default port */
sess.remote_port = 0;
sess.callback = handle_master_agentx_packet;
errno = 0;
t = netsnmp_transport_open_server("agentx", sess.peername);
if (t == NULL) {
/*
* diagnose snmp_open errors with the input netsnmp_session
* pointer.
*/
char buf[1024];
if (!netsnmp_ds_get_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_NO_ROOT_ACCESS)) {
snprintf(buf, sizeof(buf),
"Error: Couldn't open a master agentx socket to "
"listen on (%s)", sess.peername);
snmp_sess_perror(buf, &sess);
exit(1);
} else {
snprintf(buf, sizeof(buf),
"Warning: Couldn't open a master agentx socket to "
"listen on (%s)", sess.peername);
netsnmp_sess_log_error(LOG_WARNING, buf, &sess);
}
} else {
#ifdef NETSNMP_TRANSPORT_UNIX_DOMAIN
if (t->domain == netsnmp_UnixDomain && t->local != NULL) {
/*
* Apply any settings to the ownership/permissions of the
* AgentX socket
*/
int agentx_sock_perm =
netsnmp_ds_get_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCK_PERM);
int agentx_sock_user =
netsnmp_ds_get_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCK_USER);
int agentx_sock_group =
netsnmp_ds_get_int(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCK_GROUP);
char name[sizeof(struct sockaddr_un) + 1];
memcpy(name, t->local, t->local_length);
name[t->local_length] = '\0';
if (agentx_sock_perm != 0)
chmod(name, agentx_sock_perm);
if (agentx_sock_user || agentx_sock_group) {
/*
* If either of user or group haven't been set,
* then leave them unchanged.
*/
if (agentx_sock_user == 0 )
agentx_sock_user = -1;
if (agentx_sock_group == 0 )
agentx_sock_group = -1;
chown(name, agentx_sock_user, agentx_sock_group);
}
}
#endif
session =
snmp_add_full(&sess, t, NULL, agentx_parse, NULL, NULL,
agentx_realloc_build, agentx_check_packet, NULL);
}
if (session == NULL) {
netsnmp_transport_free(t);
}
}
#ifdef NETSNMP_TRANSPORT_UNIX_DOMAIN
netsnmp_unix_dont_create_path();
#endif
SNMP_FREE(agentx_sockets);
DEBUGMSGTL(("agentx/master", "initializing... DONE\n"));
}
netsnmp_session *
asmp_open(netsnmp_session *in_session)
{
netsnmp_session *session;
netsnmp_transport *transport;
if (in_session == NULL)
return NULL;
netsnmp_ds_set_int(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_DEFAULT_PORT,
ASMP_PORT);
if ((in_session->version == SNMP_VERSION_2c ||
in_session->version == SNMP_VERSION_1)
&&
(!strncmp(in_session->peername, "asmp:", 5) ||
!strncmp(in_session->peername, "asmps:", 6) ||
!strncmp(in_session->peername, "aidp:", 5)))
{
/* Set TCP flag for non-AIDP connection */
if (strncmp(in_session->peername, "aidp:", 5))
in_session->flags |= SNMP_FLAGS_STREAM_SOCKET;
if (in_session->flags & SNMP_FLAGS_STREAM_SOCKET) {
transport =
netsnmp_tdomain_transport_full("asmp", in_session->peername,
in_session->local_port, "tcp",
NULL);
} else {
transport =
netsnmp_tdomain_transport_full("aidp", in_session->peername,
in_session->local_port, "udp",
NULL);
}
// hook_create_pdu
session = snmp_add_full(in_session,
transport,
NULL, _hook_parse,
NULL, _hook_build,
NULL, _hook_check,
NULL);
if (session != NULL &&
(session->flags & SNMP_FLAGS_STREAM_SOCKET)) {
if (asmp_sess_setup(session) != 0)
goto free;
if (asmp_sess_login(session,
((struct asmp_connection *)transport->data)->proto ==
ASMP_PROTO_ASMPS ? session->securityName : "",
"") != 0) {
goto free;
}
fprintf(stderr, "ASMP initialized\n");
}
} else {
session = NULL;
}
return session;
free:
free(session);
return NULL;
}
