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/* generate an input file suitable for use by the testbench
* Copyright (C) 2018-2022 by Rainer Gerhards and Adiscon GmbH.
* Copyright (C) 2016-2018 by Pascal Withopf and Adiscon GmbH.
*
* usage: ./inputfilegen num-lines > file
* -m number of messages
* -i start number of message
* -d extra data to add (all 'X' after the msgnum)
* -s size of file to generate
* cannot be used together with -m
* size may be slightly smaller in order to be able to write
* the last complete line.
* -M "message count file" - contains number of messages to be written
* This is especially useful with -s, as the testbench otherwise does
* not know how to do a seq_check. To keep things flexible, can also be
* used with -m (this may aid testbench framework generalization).
* -f outputfile
* Permits to write data to file "outputfile" instead of stdout. Also
* enables support for SIGHUP.
* -S sleep time
* ms to sleep between sending message bulks (bulks size given by -B)
* -B number of messages in bulk
* number of messages to send without sleeping as specified in -S.
* IGNORED IF -S is not also given!
* Part of rsyslog, licensed under ASL 2.0
*/
#include "config.h"
#include <stdio.h>
#include <signal.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#if defined(_AIX)
#include <unistd.h>
#else
#include <getopt.h>
#endif
#if defined(__FreeBSD__)
#include <sys/time.h>
#else
#include <time.h>
#endif
#if defined(HAVE_SYS_SELECT_H)
#include <sys/select.h>
#endif
#define DEFMSGS 5
#define NOEXTRADATA -1
static volatile int bHadHUP = 0;
static void
hdlr_sighup(int sig)
{
fprintf(stderr, "inputfilegen: had hup, sig %d\n", sig);
bHadHUP = 1;
}
static void
sighup_enable()
{
struct sigaction sigAct;
memset(&sigAct, 0, sizeof (sigAct));
sigemptyset(&sigAct.sa_mask);
sigAct.sa_handler = hdlr_sighup;
sigaction(SIGHUP, &sigAct, NULL);
}
void msleep(const int sleepTime)
{
struct timeval tvSelectTimeout;
tvSelectTimeout.tv_sec = sleepTime / 1000;
tvSelectTimeout.tv_usec = (sleepTime % 1000) * 1000; /* micro seconds */
if(select(0, NULL, NULL, NULL, &tvSelectTimeout) == -1) {
if(errno != EINTR) {
perror("select");
exit(1);
}
}
}
static FILE *
open_output(const char *fn)
{
FILE *fh_output = fopen(fn, "w");
if(fh_output == NULL) {
perror(fn);
exit(1);
}
return fh_output;
}
int main(int argc, char* argv[])
{
int c, i;
long long nmsgs = DEFMSGS;
long long nmsgstart = 0;
int nfinishedidle = 0;
int nchars = NOEXTRADATA;
int errflg = 0;
long long filesize = -1;
char *extradata = NULL;
const char *msgcntfile = NULL;
const char *outputfile = "-";
FILE *fh_output;
int sleep_ms = 0; /* How long to sleep between message writes */
int sleep_msgs = 0; /* messages to xmit between sleeps (if configured) */
int sleep_hubreopen_ms = 5; /* Wait until new file is being reopened, logrotate may need some time */
int ctr = 0;
while((c=getopt(argc, argv, "m:M:i:I:h:d:s:f:S:B:")) != -1) {
switch(c) {
case 'm':
nmsgs = atoi(optarg);
break;
case 'M':
msgcntfile = optarg;
break;
case 'i':
nmsgstart = atoi(optarg);
break;
case 'I':
nfinishedidle = atoi(optarg);
break;
case 'd':
nchars = atoi(optarg);
break;
case 's':
filesize = atoll(optarg);
break;
case 'S':
sleep_ms = atoi(optarg);
break;
case 'B':
sleep_msgs = atoi(optarg);
break;
case 'h':
sleep_hubreopen_ms = atoi(optarg);
break;
case 'f':
outputfile = optarg;
sighup_enable();
break;
case ':':
fprintf(stderr, "Option -%c requires an operand\n", optopt);
errflg++;
break;
case '?':
fprintf(stderr, "inputfilegen: Unrecognized option: -%c\n", optopt);
errflg++;
break;
}
}
if(errflg) {
fprintf(stderr, "invalid call\n");
exit(2);
}
if(filesize != -1) {
const int linesize = (17 + nchars); /* 17 is std line size! */
nmsgs = filesize / linesize;
fprintf(stderr, "inputfilegen: file size requested %lld, actual %lld with "
"%lld lines, %lld bytes less\n",
filesize, nmsgs * linesize, nmsgs, filesize - nmsgs * linesize);
if(nmsgs > 100000000) {
fprintf(stderr, "inputfilegen: number of lines exhaust 8-digit line numbers "
"which are standard inside the testbench.\n"
"Use -d switch to add extra data (e.g. -d111 for "
"128 byte lines or -d47 for 64 byte lines)\n");
exit(1);
}
}
if(msgcntfile != NULL) {
FILE *const fh = fopen(msgcntfile, "w");
if(fh == NULL) {
perror(msgcntfile);
exit(1);
}
fprintf(fh, "%lld", nmsgs);
fclose(fh);
}
if(strcmp(outputfile, "-")) {
fh_output = open_output(outputfile);
} else {
fh_output = stdout;
}
if(nchars != NOEXTRADATA) {
extradata = (char *)malloc(nchars + 1);
memset(extradata, 'X', nchars);
extradata[nchars] = '\0';
}
for(i = nmsgstart; i < (nmsgs+nmsgstart); ++i) {
if( sleep_ms > 0 &&
ctr++ >= sleep_msgs) {
msleep(sleep_ms);
ctr = 0;
}
if(bHadHUP) {
fclose(fh_output);
if(sleep_hubreopen_ms > 0) {
/* Extra Sleep so logrotate or whatever can take place */
msleep(sleep_hubreopen_ms);
}
fh_output = open_output(outputfile);
fprintf(stderr, "inputfilegen: %s reopened\n", outputfile);
fprintf(stderr, "inputfilegen: current message number %d\n", i);
bHadHUP = 0;
}
fprintf(fh_output, "msgnum:%8.8d:", i);
if(nchars != NOEXTRADATA) {
fprintf(fh_output, "%s", extradata);
}
fprintf(fh_output, "\n");
}
if (nfinishedidle > 0) {
/* Keep process open for nfinishedidle ms */
for(int x = 0; x < nfinishedidle; ++x) {
if(bHadHUP) {
/* Create empty file */
fh_output = open_output(outputfile);
fclose(fh_output);
fprintf(stderr, "inputfilegen: last message number was %d\n", i);
bHadHUP = 0;
}
msleep(1);
}
}
free(extradata);
return 0;
}
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