int
create_trap_session(char *sink, u_short sinkport,
char *com, int version, int pdutype)
{
netsnmp_session session, *sesp;
char *peername = NULL;
if ((peername = malloc(strlen(sink) + 4 + 32)) == NULL) {
return 0;
} else {
snprintf(peername, strlen(sink) + 4 + 32, "udp:%s:%hu", sink,
sinkport);
}
memset(&session, 0, sizeof(netsnmp_session));
session.peername = peername;
session.version = version;
if (com) {
session.community = (u_char *) com;
session.community_len = strlen(com);
}
sesp = snmp_open(&session);
free(peername);
if (sesp) {
return add_trap_session(sesp, pdutype,
(pdutype == SNMP_MSG_INFORM), version);
}
/*
* diagnose snmp_open errors with the input netsnmp_session pointer
*/
snmp_sess_perror("snmpd: create_trap_session", &session);
return 0;
}
void
snmpd_parse_config_trapsess(const char *word, char *cptr)
{
char *argv[MAX_ARGS], *cp = cptr, tmp[SPRINT_MAX_LEN];
int argn, arg;
netsnmp_session session, *ss;
/*
* inform or trap? default to trap
*/
traptype = SNMP_MSG_TRAP2;
/*
* create the argv[] like array
*/
argv[0] = strdup("snmpd-trapsess"); /* bogus entry for getopt() */
for (argn = 1; cp && argn < MAX_ARGS; argn++) {
cp = copy_nword(cp, tmp, SPRINT_MAX_LEN);
argv[argn] = strdup(tmp);
}
arg = snmp_parse_args(argn, argv, &session, "C:", trapOptProc);
ss = snmp_open(&session);
for (; argn > 0; argn--) {
free(argv[argn - 1]);
}
if (!ss) {
config_perror
("snmpd: failed to parse this line or the remote trap receiver is down. Possible cause:");
snmp_sess_perror("snmpd: snmpd_parse_config_trapsess()", &session);
return;
}
#ifndef DISABLE_SNMPV1
if (ss->version == SNMP_VERSION_1) {
add_trap_session(ss, SNMP_MSG_TRAP, 0, SNMP_VERSION_1);
} else {
#endif
add_trap_session(ss, traptype, (traptype == SNMP_MSG_INFORM),
ss->version);
#ifndef DISABLE_SNMPV1
}
#endif
}
int
create_trap_session(char *sink, u_short sinkport,
char *com, int version, int pdutype)
{
netsnmp_session session, *sesp;
char *peername = NULL;
int len;
len = strlen(sink) + 4 + 32;
if ((peername = malloc(len)) == NULL) {
return 0;
} else if (NULL != strchr(sink,':')) {
snprintf(peername, len, "%s", sink);
} else {
snprintf(peername, len, "udp:%s:%hu", sink, sinkport);
}
memset(&session, 0, sizeof(netsnmp_session));
session.peername = peername;
session.version = version;
if (com) {
session.community = (u_char *) com;
session.community_len = strlen(com);
}
/*
* for informs, set retries to default
*/
if (SNMP_MSG_INFORM == pdutype) {
session.timeout = SNMP_DEFAULT_TIMEOUT;
session.retries = SNMP_DEFAULT_RETRIES;
}
/*
* if the sink is localhost, bind to localhost, to reduce open ports.
*/
if ((NULL == netsnmp_ds_get_string(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_CLIENT_ADDR)) &&
((0 == strcmp("localhost",sink)) || (0 == strcmp("127.0.0.1",sink))))
session.localname = "localhost";
sesp = snmp_open(&session);
free(peername);
if (sesp) {
return add_trap_session(sesp, pdutype,
(pdutype == SNMP_MSG_INFORM), version);
}
/*
* diagnose snmp_open errors with the input netsnmp_session pointer
*/
snmp_sess_perror("snmpd: create_trap_session", &session);
return 0;
}
static int
create_trap_session2(const char *sink, const char* sinkport,
char *com, int version, int pdutype)
{
netsnmp_transport *t;
netsnmp_session session, *sesp;
memset(&session, 0, sizeof(netsnmp_session));
session.version = version;
if (com) {
session.community = (u_char *) com;
session.community_len = strlen(com);
}
/*
* for informs, set retries to default
*/
if (SNMP_MSG_INFORM == pdutype) {
session.timeout = SNMP_DEFAULT_TIMEOUT;
session.retries = SNMP_DEFAULT_RETRIES;
}
/*
* if the sink is localhost, bind to localhost, to reduce open ports.
*/
if ((NULL == netsnmp_ds_get_string(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_CLIENT_ADDR)) &&
((0 == strcmp("localhost",sink)) || (0 == strcmp("127.0.0.1",sink))))
session.localname = "localhost";
t = netsnmp_tdomain_transport_full("snmptrap", sink, 0, NULL, sinkport);
if (t != NULL) {
sesp = snmp_add(&session, t, NULL, NULL);
if (sesp) {
return add_trap_session(sesp, pdutype,
(pdutype == SNMP_MSG_INFORM), version);
}
}
/*
* diagnose snmp_open errors with the input netsnmp_session pointer
*/
snmp_sess_perror("snmpd: create_trap_session", &session);
return 0;
}
int create_trap_session (char *sink, u_short sinkport,
char *com,
int version, int pdutype)
{
struct snmp_session session, *sesp;
memset (&session, 0, sizeof (struct snmp_session));
session.peername = sink;
session.version = version;
if (com) {
session.community = (u_char *)com;
session.community_len = strlen (com);
}
session.remote_port = sinkport;
sesp = snmp_open (&session);
if (sesp) {
return( add_trap_session( sesp, pdutype, version ));
}
/* diagnose snmp_open errors with the input struct snmp_session pointer */
snmp_sess_perror("snmpd: create_trap_session", &session);
return 0;
}
void
snmpd_parse_config_trapsess(const char *word, char *cptr)
{
char *argv[MAX_ARGS], *cp = cptr, tmp[SPRINT_MAX_LEN];
int argn, arg;
netsnmp_session session, *ss;
size_t len;
/*
* inform or trap? default to trap
*/
traptype = SNMP_MSG_TRAP2;
/*
* create the argv[] like array
*/
argv[0] = strdup("snmpd-trapsess"); /* bogus entry for getopt() */
for (argn = 1; cp && argn < MAX_ARGS; argn++) {
cp = copy_nword(cp, tmp, SPRINT_MAX_LEN);
argv[argn] = strdup(tmp);
}
arg = snmp_parse_args(argn, argv, &session, "C:", trapOptProc);
ss = snmp_add(&session,
netsnmp_transport_open_client("snmptrap", session.peername),
NULL, NULL);
for (; argn > 0; argn--) {
free(argv[argn - 1]);
}
if (!ss) {
config_perror
("snmpd: failed to parse this line or the remote trap receiver is down. Possible cause:");
snmp_sess_perror("snmpd: snmpd_parse_config_trapsess()", &session);
return;
}
/*
* If this is an SNMPv3 TRAP session, then the agent is
* the authoritative engine, so set the engineID accordingly
*/
if (ss->version == SNMP_VERSION_3 &&
traptype != SNMP_MSG_INFORM &&
ss->securityEngineIDLen == 0) {
len = snmpv3_get_engineID( tmp, sizeof(tmp));
memdup(&ss->securityEngineID, tmp, len);
ss->securityEngineIDLen = len;
}
#ifndef NETSNMP_DISABLE_SNMPV1
if (ss->version == SNMP_VERSION_1) {
add_trap_session(ss, SNMP_MSG_TRAP, 0, SNMP_VERSION_1);
} else {
#endif
add_trap_session(ss, traptype, (traptype == SNMP_MSG_INFORM),
ss->version);
#ifndef NETSNMP_DISABLE_SNMPV1
}
#endif
}
/*
* 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;
}