/* loginlog.c 1.0.1 Mark mark@blackplague.gmu.edu 3rd Feb 1994 */
/* Distribute freely, copyright remains with the author */
/* Compile with: cc -s -O -o loginlog loginlog.c */
/* Compiled and tested on NeXTStep 3.1 and Linux 0.99.10 */


#include    <stdio.h>
#include    <ctype.h>
#include    <sys/types.h>
#include    <sys/stat.h>
#include    <sys/file.h>
#include    <errno.h>
#include    <sys/param.h>
#include    <syslog.h>
#include    <utmp.h>

#define INPUTFILE "/usr/adm/wtmp"
#define NMAX    sizeof(utmpbp->ut_name)
#define LMAX    sizeof(utmpbp->ut_line)
#define HMAX    sizeof(utmpbp->ut_host)

char buf[256];
struct utmp *utmpbp;

main(argc, argv)
int argc;
char **argv;
{
    register int n;

    (void)close(0);
    if (fork()) exit(0);
    if (open(INPUTFILE,0)!=0) {
        fprintf(stderr, "lasttolog: ");
        perror(INPUTFILE);
        exit(1);
    }
    utmpbp = (struct utmp *) malloc(sizeof(struct utmp));
    (void) openlog(argv[0], LOG_NDELAY, LOG_AUTH);
    /* syslog(LOG_ALERT, "running"); */
    (void)lseek(0,(off_t)0,L_XTND); /* seek to end */
    for (;;) { /* sit here and wait for people to log in */
        sleep(10);
        while ((n = read (0, utmpbp, sizeof(struct utmp))) > 0) {
            if (strncmp(utmpbp->ut_name, "", NMAX)) {
                sprintf(buf, "%-*.*s %-*.*s %-*.*s",
                    NMAX, NMAX, utmpbp->ut_name,
                    8, 8, utmpbp->ut_line,
                    HMAX, HMAX, utmpbp->ut_host);
                syslog(LOG_ALERT, buf);
            }
        }
    }
}