Generate fake log entries to stdout

genlogs.c

/* genlogs.c - Generate fake log entries to stdout */

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

#define DATE_MAX_CHARS 25
#define SIZE(a) (sizeof(a) / sizeof(*(a)))

char *messages[] = {
    "%s %s Invalid user %s\n",
    "%s %s Failed password for %s\n",
    "%s %s pam_unix(sshd:session)Session opened for user %s\n",
    "%s %s pam_unix(sshd: session) Session closed for user %s\n",
    "%s %s Accepted password for %s\n",
    "%s %s sudo: %s ; TTY=pts/0 ; PWD=/ ; USER=root ; COMMAND=/bin/su\n",
    "%s %s running '/usr/local/repo-check.py' with root privileges on behalf of '%s'\n",
    "%s %s session opened for user %s by (uid=0)\n",
};

char *levels[] = {
    "ERROR",
    "WARNING",
    "INFO",
    "DEBUG",
    "TRACE",
};

char *users[] = {
    "doc",
    "grumpy",
    "happy",
    "sleepy",
    "bashful",
    "sneezy",
    "dopey",
};

int main(int argc, char *argv[])
{
    int delay = 1;
    time_t now;
    struct tm *timestamp;
    char date[DATE_MAX_CHARS];
    int l, m, u;

    if (argc > 1) {
        delay = atoi(argv[1]);
    }

    setbuf(stdout, NULL);

    for (;;) {
        now = time(NULL);
        timestamp = localtime(&now);
        strftime(date, DATE_MAX_CHARS, "[%F %T]", timestamp);

        m = rand() % SIZE(messages);
        l = rand() % SIZE(levels);
        u = rand() % SIZE(users);

        printf(messages[m], date, levels[l], users[u]);
        sleep(delay);
    }

    return 0;
}