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/*
This program reads events from ITO server or agent event stream and
writes them to standard output. Its main task is to be a link between
ITO and external message processing application (e.g. correlation engine).
This program takes 2 commandline parameters:
MSI interface - name used internally by ITO to denote the interface that
is used for passing messages to this program. You can
pick up arbitrary name, provided that it meets naming
convention used by ITO (see ITO Application Integration
Guide for more information). Generally, using up to 12
a-z characters as a name should be safe.
reopen timeout - if there has been no new data for a given number of
seconds, reopen the interface. Using 0 as a value
disables reopening.
Compiling on ITO server (tested on HPUX running ITO5.3):
gcc -o itostream itostream.c -L/opt/OV/lib -lopcsv -lnsp
Compiling on ITO agent:
gcc -o itostream itostream.c -DAGENT -L/opt/OV/lib -lopc -lnsp
Since ITO agent installation is sometimes broken, you might not have libopc
in /opt/OV/lib (which normally is just a symbolic link to libopc_r or some
other library in the same directory). In that case you could just try:
gcc -o itostream itostream.c -DAGENT -L/opt/OV/lib -lopc_r -lnsp
Compiled program needs root-privileges for running.
If ITO shared libraries are not found when starting the program, recompile
with additional options -Xlinker -rpath /opt/OV/lib
*/
#include <stdio.h> /* stdio stuff */
#include <stdlib.h> /* free(), atoi() */
#include <unistd.h> /* sleep() */
#ifdef AGENT
#include "/opt/OV/include/opcapi.h" /* ITO agent-side stuff */
#else
#include "/opt/OV/include/opcsvapi.h" /* ITO server-side stuff */
#endif
#define ERRORMSGSIZE 1024
#define SLEEPEMPTY 1 /* sleep on empty input before new read attempt */
#define SLEEPOPEN 3 /* sleep between closing and reopening the input */
void error_msg(int code, char *text)
{
int size;
char *ptr;
opcdata_get_error_msg(code, &ptr, &size);
strncpy(text, ptr, size);
text[size] = 0;
free(ptr);
}
int open_if(char *ifname)
{
int ret;
char errortext[ERRORMSGSIZE];
int interface;
#ifdef AGENT
ret = opcif_open(OPCAGTIF_EXTMSGPROC_READWRITE, ifname, OPCIF_SV_RUNNING |
OPCIF_READ_NOWAIT | OPCIF_IGNORE_MSI_ALREADY_EXISTS, 0, &interface);
#else
ret = opcif_open(OPCSVIF_EXTMSGPROC_READWRITE, ifname, OPCIF_SV_RUNNING |
OPCIF_READ_NOWAIT | OPCIF_IGNORE_MSI_ALREADY_EXISTS, 0, &interface);
#endif
if (ret != OPC_ERR_OK) {
error_msg(ret, errortext);
fprintf(stderr,
"Error opening MSI interface \"%s\": %s\n", ifname, errortext);
exit(1);
}
ret = opcif_register(interface, 0, 0);
if (ret != OPC_ERR_OK) {
error_msg(ret, errortext);
fprintf(stderr,
"Error registering condition with MSI interface \"%s\": %s\n",
ifname, errortext);
opcif_close(interface);
exit(1);
}
return interface;
}
void find_sev(int severity, char *text)
{
switch(severity) {
case OPC_SEV_UNCHANGED:
strcpy(text, "unchanged");
break;
case OPC_SEV_UNKNOWN:
strcpy(text, "unknown");
break;
case OPC_SEV_NORMAL:
strcpy(text, "normal");
break;
case OPC_SEV_WARNING:
strcpy(text, "warning");
break;
case OPC_SEV_CRITICAL:
strcpy(text, "critical");
break;
case OPC_SEV_MINOR:
strcpy(text, "minor");
break;
case OPC_SEV_MAJOR:
strcpy(text, "major");
break;
}
}
int main(int argc, char **argv)
{
int interface;
int reopen, sleepcounter;
int ret;
char errortext[ERRORMSGSIZE];
opcdata msg;
long time;
long severity;
char sevtext[32];
char *id, *app, *obj, *node;
char *msg_group, *msg_text;
if (argc < 3) {
fprintf(stderr,
"Usage: %s <MSI interface name> <reopen timeout>\n", argv[0]);
exit(1);
}
/* set stdout buffering to line mode
(needed if stdout was redirected to a file or to a pipe) */
setvbuf(stdout, 0, _IOLBF, 0);
interface = open_if(argv[1]);
reopen = atoi(argv[2]);
opcdata_create(OPCDTYPE_EMPTY, &msg);
sleepcounter = 0;
for (;;) {
ret = opcif_read(interface, msg);
switch (ret) {
case OPC_ERR_OK:
sleepcounter = 0;
id = opcdata_get_str(msg, OPCDATA_MSGID);
time = opcdata_get_long(msg, OPCDATA_CREATION_TIME);
severity = opcdata_get_long(msg, OPCDATA_SEVERITY);
node = opcdata_get_str(msg, OPCDATA_NODENAME);
app = opcdata_get_str(msg, OPCDATA_APPLICATION);
obj = opcdata_get_str(msg, OPCDATA_OBJECT);
msg_group = opcdata_get_str(msg, OPCDATA_GROUP);
msg_text = opcdata_get_str(msg, OPCDATA_MSGTEXT);
find_sev(severity, sevtext);
printf("id=%s time=%ld sev=%s node=%s app=%s obj=%s msg_grp=%s msg_text=%s\n",
id, time, sevtext, node, app, obj, msg_group, msg_text);
break;
case OPC_ERR_NO_DATA:
sleep(SLEEPEMPTY);
sleepcounter += SLEEPEMPTY;
if (reopen && sleepcounter >= reopen) {
fprintf(stderr, "Reopening MSI interface \"%s\"\n", argv[1]);
sleepcounter = 0;
opcif_close(interface);
sleep(SLEEPOPEN);
interface = open_if(argv[1]);
}
break;
default:
error_msg(ret, errortext);
fprintf(stderr, "Error reading from MSI interface \"%s\": %s\n",
argv[1], errortext);
opcdata_free(&msg);
opcif_close(interface);
exit(1);
}
}
}
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