blob: 340f11408e0a2df9f24473526b0f5854fd550149 [file] [log] [blame]
#include <net-snmp/net-snmp-config.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* optind, optarg and optopt */
#endif
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "../agent/mibgroup/agentx/agentx_config.h"
#include "../agent/mibgroup/agentx/client.h"
#include "../agent/mibgroup/agentx/protocol.h"
#ifdef __GNUC__
#define UNUSED __attribute__((unused))
#else
#define UNUSED
#endif
extern const oid sysuptime_oid[];
extern const size_t sysuptime_oid_len;
extern const oid snmptrap_oid[];
extern const size_t snmptrap_oid_len;
static void
usage(const char* progname)
{
fprintf(stderr,
"USAGE: %s [OPTIONS] TRAP-PARAMETERS\n"
"\n"
" Version: %s\n"
" Web: http://www.net-snmp.org/\n"
" Email: net-snmp-coders@lists.sourceforge.net\n"
"\n"
"OPTIONS:\n", progname, netsnmp_get_version());
fprintf(stderr,
" -h\t\t\tdisplay this help message\n"
" -V\t\t\tdisplay package version number\n"
" -m MIB[" ENV_SEPARATOR "...]\t\tload given list of MIBs (ALL loads "
"everything)\n"
" -M DIR[" ENV_SEPARATOR "...]\t\tlook in given list of directories for MIBs\n"
" -D[TOKEN[,...]]\tturn on debugging output for the specified "
"TOKENs\n"
"\t\t\t (ALL gives extremely verbose debugging output)\n"
" -d\t\t\tdump all traffic\n");
#ifndef NETSNMP_DISABLE_MIB_LOADING
fprintf(stderr,
" -P MIBOPTS\t\tToggle various defaults controlling mib "
"parsing:\n");
snmp_mib_toggle_options_usage("\t\t\t ", stderr);
#endif /* NETSNMP_DISABLE_MIB_LOADING */
fprintf(stderr,
" -L LOGOPTS\t\tToggle various defaults controlling logging:\n");
snmp_log_options_usage("\t\t\t ", stderr);
fprintf(stderr,
" -c context\n"
" -U uptime\n"
" -x ADDRESS\t\tuse ADDRESS as AgentX address\n"
"\n"
"TRAP-PARAMETERS:\n"
" trapoid [OID TYPE VALUE] ...\n");
}
struct tState_s;
typedef const struct tState_s* tState;
struct tState_s {
void (*entry)(tState self); /**<< State entry action */
void (*exit)(tState self); /**<< State exit action */
/** Handler for AgentX-Response-PDU's */
void (*response)(tState self, netsnmp_pdu *res);
/** State to change to if an AgentX timeout occurs or the timer runs out */
tState timeout;
void (*disconnect)(tState self); /**<< Handler for disconnect indications */
/** Handler for Close-PDU indications */
void (*close)(tState self, netsnmp_pdu *res);
const char* name; /**<< Name of the current state */
int is_open; /**<< If the connection is open in this state */
};
static tState state; /**<< Current state of the state machine */
static tState next_state; /**<< Next state of the state machine */
static const char *context = NULL; /**<< Context that delivers the trap */
static size_t contextLen; /**<< Length of eventual context */
static int result = 1; /**<< Program return value */
static netsnmp_pdu *pdu = NULL; /**<< The trap pdu that is to be sent */
/** The reference number of the next packet */
static long packetid = 0;
/** The session id of the session to the master */
static long session;
static void *sessp = NULL; /**<< The current communication session */
#define STATE_CALL(method) \
if(!state->method) { \
snmp_log(LOG_ERR, "No " #method " method in %s, terminating\n", \
state->name); \
abort(); \
} else \
state->method
static void
change_state(tState new_state)
{
if (next_state && next_state != new_state)
DEBUGMSGTL(("process", "Ignore transition to %s\n", next_state->name));
next_state = new_state;
}
static int
handle_agentx_response(int operation, netsnmp_session *sp, UNUSED int reqid,
netsnmp_pdu *act, UNUSED void *magic)
{
switch(operation) {
case NETSNMP_CALLBACK_OP_RECEIVED_MESSAGE:
if(act->command == AGENTX_MSG_CLEANUPSET) {
/* Do nothing - no response and no action as nothing get
* allocated in any handler here
*/
} else if(act->command != AGENTX_MSG_RESPONSE) {
/* Copy the head to a response */
netsnmp_pdu* res = snmp_split_pdu(act, 0, 0);
res->command = AGENTX_MSG_RESPONSE;
if (act->sessid != session || !state->is_open)
res->errstat = AGENTX_ERR_NOT_OPEN;
if(res->errstat == AGENTX_ERR_NOERROR)
switch(act->command) {
case AGENTX_MSG_GET:
res->variables = snmp_clone_varbind(act->variables);
snmp_reset_var_types(res->variables, SNMP_NOSUCHOBJECT);
break;
case AGENTX_MSG_GETNEXT:
case AGENTX_MSG_GETBULK:
res->variables = snmp_clone_varbind(act->variables);
snmp_reset_var_types(res->variables, SNMP_ENDOFMIBVIEW);
break;
case AGENTX_MSG_TESTSET:
res->errstat = SNMP_ERR_NOTWRITABLE;
res->errindex = 1;
break;
case AGENTX_MSG_COMMITSET:
res->errstat = SNMP_ERR_COMMITFAILED;
res->errindex = 1;
break;
case AGENTX_MSG_UNDOSET:
/* Success - could undo not setting any value :-) */
break;
case AGENTX_MSG_CLOSE:
/* Always let the master succeed! */
break;
default:
/* Unknown command */
res->errstat = AGENTX_ERR_PARSE_FAILED;
break;
}
if(snmp_send(sp, res) == 0)
snmp_free_pdu(res);
switch(act->command) {
case AGENTX_MSG_CLOSE:
/* Take action once the answer is sent! */
STATE_CALL(close)(state, act);
break;
default:
/* Do nothing */
break;
}
} else
/* RESPONSE act->time, act->errstat, act->errindex, varlist */
STATE_CALL(response)(state, act);
break;
case NETSNMP_CALLBACK_OP_TIMED_OUT:
change_state(state->timeout);
break;
case NETSNMP_CALLBACK_OP_DISCONNECT:
STATE_CALL(disconnect)(state);
break;
}
return 0;
}
extern const struct tState_s Connecting;
extern const struct tState_s Opening;
extern const struct tState_s Notifying;
extern const struct tState_s Closing;
extern const struct tState_s Disconnecting;
extern const struct tState_s Exit;
static void
StateDisconnect(UNUSED tState self)
{
snmp_log(LOG_ERR, "Unexpected disconnect in state %s\n", self->name);
change_state(&Disconnecting);
}
static void
StateClose(UNUSED tState self, netsnmp_pdu *act)
{
snmp_log(LOG_ERR, "Unexpected close with reason code %ld in state %s\n",
act->errstat, self->name);
change_state(&Disconnecting);
}
static void
ConnectingEntry(UNUSED tState self)
{
netsnmp_session init;
netsnmp_transport* t;
void* sess;
if(sessp) {
snmp_sess_close(sessp);
sessp = NULL;
}
snmp_sess_init(&init);
init.version = AGENTX_VERSION_1;
init.retries = 0; /* Retries are handled by the state machine */
init.timeout = SNMP_DEFAULT_TIMEOUT;
init.flags |= SNMP_FLAGS_STREAM_SOCKET;
init.callback = handle_agentx_response;
init.authenticator = NULL;
if(!(t = netsnmp_transport_open_client(
"agentx", netsnmp_ds_get_string(
NETSNMP_DS_APPLICATION_ID, NETSNMP_DS_AGENT_X_SOCKET)))) {
snmp_log(LOG_ERR, "Failed to connect to AgentX server\n");
change_state(&Exit);
} else if(!(sess = snmp_sess_add_ex(
&init, t, NULL, agentx_parse, NULL, NULL,
agentx_realloc_build, agentx_check_packet, NULL))) {
snmp_log(LOG_ERR, "Failed to create session\n");
change_state(&Exit);
} else {
sessp = sess;
change_state(&Opening);
}
}
const struct tState_s Connecting = {
ConnectingEntry,
NULL,
NULL,
NULL,
StateDisconnect,
NULL,
"Connnecting",
0
};
static netsnmp_pdu*
pdu_create_opt_context(int command, const char* context, size_t len)
{
netsnmp_pdu* res = snmp_pdu_create(command);
if (res)
if (context) {
if (snmp_clone_mem((void**)&res->contextName, context, len)) {
snmp_free_pdu(res);
res = NULL;
} else
res->contextNameLen = len;
}
return res;
}
static void
OpeningEntry(UNUSED tState self)
{
netsnmp_pdu* act =
pdu_create_opt_context(AGENTX_MSG_OPEN, context, contextLen);
if(act) {
act->sessid = 0;
act->transid = 0;
act->reqid = ++packetid;
act->time = 0;
snmp_pdu_add_variable(act, NULL, 0, ASN_OCTET_STR, NULL, 0);
if(snmp_sess_send(sessp, act) == 0)
snmp_free_pdu(act);
}
}
static void
OpeningRes(UNUSED tState self, netsnmp_pdu *act)
{
if(act->errstat == AGENTX_ERR_NOERROR) {
session = act->sessid;
change_state(&Notifying);
} else {
snmp_log(LOG_ERR, "Failed to open session");
change_state(&Exit);
}
}
const struct tState_s Opening = {
OpeningEntry,
NULL,
OpeningRes,
&Disconnecting,
StateDisconnect,
StateClose,
"Opening",
0
};
static void
NotifyingEntry(UNUSED tState self)
{
netsnmp_pdu* act = snmp_clone_pdu(pdu);
if(act) {
act->sessid = session;
act->transid = 0;
act->reqid = ++packetid;
if(snmp_sess_send(sessp, act) == 0)
snmp_free_pdu(act);
}
}
static void
NotifyingRes(UNUSED tState self, netsnmp_pdu *act)
{
if(act->errstat == AGENTX_ERR_NOERROR)
result = 0;
else
snmp_log(LOG_ERR, "Failed to send notification");
/** \todo: Retry handling --- ClosingReconnect??? */
change_state(&Closing);
}
const struct tState_s Notifying = {
NotifyingEntry,
NULL,
NotifyingRes,
NULL, /** \todo: Retry handling? */
StateDisconnect, /** \todo: Retry handling? */
StateClose,
"Notifying",
1
};
static void
ClosingEntry(UNUSED tState self)
{
/* CLOSE pdu->errstat */
netsnmp_pdu* act =
pdu_create_opt_context(AGENTX_MSG_CLOSE, context, contextLen);
if(act) {
act->sessid = session;
act->transid = 0;
act->reqid = ++packetid;
act->errstat = AGENTX_CLOSE_SHUTDOWN;
if(snmp_sess_send(sessp, act) == 0)
snmp_free_pdu(act);
}
}
static void
ClosingRes(UNUSED tState self, netsnmp_pdu *act)
{
if(act->errstat != AGENTX_ERR_NOERROR) {
snmp_log(LOG_ERR, "AgentX error status of %ld\n", act->errstat);
}
change_state(&Disconnecting);
}
static void
ClosingDisconnect(UNUSED tState self)
{
change_state(&Disconnecting);
}
static void
ClosingClose(UNUSED tState self, UNUSED netsnmp_pdu *act)
{
change_state(&Disconnecting);
}
const struct tState_s Closing = {
ClosingEntry,
NULL,
ClosingRes,
&Disconnecting,
ClosingDisconnect,
ClosingClose,
"Closing",
1
};
static void
DisconnectingEntry(UNUSED tState self)
{
snmp_sess_close(sessp);
sessp = NULL;
change_state(&Exit);
}
const struct tState_s Disconnecting = {
DisconnectingEntry,
NULL,
NULL,
NULL,
NULL,
NULL,
"Disconnecting",
0
};
const struct tState_s Exit = {
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
"Exit",
0
};
int
main(int argc, char *argv[])
{
int arg;
char *prognam;
char *cp = NULL;
const char* sysUpTime = NULL;
prognam = strrchr(argv[0], '/');
if (prognam)
++prognam;
else
prognam = argv[0];
putenv(strdup("POSIXLY_CORRECT=1"));
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_DISABLE_PERSISTENT_LOAD, 1);
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_DISABLE_PERSISTENT_SAVE, 1);
while ((arg = getopt(argc, argv, ":Vhm:M:D:dP:L:U:c:x:")) != -1) {
switch (arg) {
case 'h':
usage(prognam);
exit(0);
case 'm':
setenv("MIBS", optarg, 1);
break;
case 'M':
setenv("MIBDIRS", optarg, 1);
break;
case 'c':
context = optarg;
contextLen = strlen(context);
break;
case 'D':
debug_register_tokens(optarg);
snmp_set_do_debugging(1);
break;
case 'd':
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_DUMP_PACKET, 1);
break;
case 'U':
sysUpTime = optarg;
break;
case 'V':
fprintf(stderr, "NET-SNMP version: %s\n", netsnmp_get_version());
exit(0);
break;
#ifndef DISABLE_MIB_LOADING
case 'P':
cp = snmp_mib_toggle_options(optarg);
if (cp != NULL) {
fprintf(stderr, "Unknown parser option to -P: %c.\n", *cp);
usage(prognam);
exit(1);
}
break;
#endif /* DISABLE_MIB_LOADING */
case 'L':
if (snmp_log_options(optarg, argc, argv) < 0) {
exit(1);
}
break;
case 'x':
if (optarg != NULL) {
netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCKET, optarg);
} else
usage(argv[0]);
break;
case ':':
fprintf(stderr, "Option -%c requires an operand\n", optopt);
usage(prognam);
exit(1);
break;
case '?':
fprintf(stderr, "Unrecognized option: -%c\n", optopt);
usage(prognam);
exit(1);
break;
}
}
arg = optind;
/* initialize tcpip, if necessary */
SOCK_STARTUP;
init_snmp("snmpapp");
agentx_config_init();
/* NOTIFY varlist */
pdu = pdu_create_opt_context(AGENTX_MSG_NOTIFY, context, contextLen);
if (sysUpTime)
snmp_add_var(pdu, sysuptime_oid, sysuptime_oid_len, 't', sysUpTime);
if (arg == argc) {
fprintf(stderr, "Missing trap-oid parameter\n");
usage(prognam);
SOCK_CLEANUP;
exit(1);
}
if (snmp_add_var(pdu, snmptrap_oid, snmptrap_oid_len, 'o', argv[arg])) {
snmp_perror(argv[arg]);
SOCK_CLEANUP;
exit(1);
}
++arg;
while (arg < argc) {
oid name[MAX_OID_LEN];
size_t name_length = MAX_OID_LEN;
arg += 3;
if (arg > argc) {
fprintf(stderr, "%s: Missing type/value for variable\n",
argv[arg - 3]);
SOCK_CLEANUP;
exit(1);
}
if (!snmp_parse_oid(argv[arg - 3], name, &name_length)) {
snmp_perror(argv[arg - 3]);
SOCK_CLEANUP;
exit(1);
}
if (snmp_add_var(pdu, name, name_length, argv[arg - 2][0],
argv[arg - 1]) != 0) {
snmp_perror(argv[arg - 3]);
SOCK_CLEANUP;
exit(1);
}
}
packetid = 0;
state = &Connecting;
next_state = NULL;
if(state->entry) state->entry(state);
/* main loop here... */
for(;;) {
int block = 1;
int numfds = 0;
int count;
fd_set fdset;
struct timeval timeout;
while(next_state) {
if(state->exit) state->exit(state);
DEBUGMSGTL(("process", "State transition: %s -> %s\n",
state->name, next_state->name));
state = next_state;
next_state = NULL;
if(state->entry) state->entry(state);
}
if(state == &Exit)
break;
FD_ZERO(&fdset);
snmp_sess_select_info(sessp, &numfds, &fdset, &timeout, &block);
count = select(numfds, &fdset, NULL, NULL, !block ? &timeout : NULL);
if (count > 0)
snmp_sess_read(sessp, &fdset);
else if (count == 0)
snmp_sess_timeout(sessp);
else if (errno != EINTR) {
snmp_log(LOG_ERR, "select error [%s]\n", strerror(errno));
change_state(&Exit);
}
}
/* at shutdown time */
snmp_free_pdu(pdu);
pdu = NULL;
snmp_shutdown("snmpapp");
SOCK_CLEANUP;
exit(result);
}