/*============================================================
           logchk  - Log Viewer&Checker Version 1.30
                      Programmed by UNYUN
  ============================================================
*/
#include <sys/types.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/file.h>
#include <fcntl.h>
#include <utmp.h>
#include <utmpx.h>
#include <lastlog.h>
#include <pwd.h>

#define UTMP_NAME "/var/adm/utmp" 
#define UTMPX_NAME "/var/adm/utmpx" 
#define WTMP_NAME "/var/adm/wtmp" 
#define WTMPX_NAME "/var/adm/wtmpx" 
#define LASTLOG_NAME "/var/adm/lastlog" 

void display_utmp(char *fn) 
{ 
	int f; 
	struct utmp utmp_ent; 
	char	buf[10],buf2[32];

	if ((f=open(fn,O_RDONLY))>=0){
		printf("\n\n[%s]\n",fn);
		printf("%-15s %-6s %-15s %-4s %-15s\n","Name","id","Line","Type","Time");
   		printf("--------------------------------------------------------------------------\n");
		while(read (f, &utmp_ent, sizeof (utmp_ent))>0){
			strncpy(buf,utmp_ent.ut_id,4);
			buf[4]=0;
			strncpy(buf2,utmp_ent.ut_user,8);
			buf[8]=0;
            printf("%-15s %-6s %-15s %4d %s",buf2,buf,utmp_ent.ut_line,utmp_ent.ut_type,asctime(localtime(&utmp_ent.ut_time)));
		}
		close(f);
	}else
		printf("Logfile %s can not be opened\n",WTMP_NAME);
} 

void display_utmpx(char *fn) 
{ 
	int f; 
	struct utmpx utmpx_ent; 
	char	buf[10];

	if ((f=open(fn,O_RDONLY))>=0){ 
		printf("\n\n[%s]\n",fn);
		printf("%-15s %-6s %-15s %-4s %-15s\n","Name","id","Line","Type","Host");
		printf("--------------------------------------------------------------\n");
		while(read (f, &utmpx_ent, sizeof (utmpx_ent))> 0 ) {
			strncpy(buf,utmpx_ent.ut_id,4);
			buf[4]=0;
            printf("%-15s %-6s %-15s %4d %-15s\n",utmpx_ent.ut_user,buf,utmpx_ent.ut_line,utmpx_ent.ut_type,utmpx_ent.ut_host);
		}
		close(f); 
	}else 
		printf("Logfile %s can not be opened\n",WTMP_NAME);
} 

void display_wtmp(char *fn) 
{ 
	int f; 
	struct utmp utmp_ent; 
	char	buf[10],buf2[32];

	if ((f=open(fn,O_RDONLY))>=0){ 
		printf("\n\n[%s]\n",fn);
		printf("%-15s %-6s %-15s %-4s %-15s\n","Name","id","Line","Type","Time");
		printf("--------------------------------------------------------------\n");
		while(read (f, &utmp_ent, sizeof (utmp_ent))> 0){
			strncpy(buf,utmp_ent.ut_id,4);
			buf[4]=0;
			strncpy(buf2,utmp_ent.ut_user,8);
			buf[8]=0;
            printf("%-15s %-6s %-15s %4d %s",buf2,buf,utmp_ent.ut_line,utmp_ent.ut_type,asctime(localtime(&utmp_ent.ut_time)));
		}
		close(f);
	}else
		printf("Logfile %s can not be opened\n",WTMP_NAME);
} 
void display_wtmpx(char *fn) 
{ 
	int f; 
	struct utmpx utmpx_ent; 
	char	buf[10];

	if ((f=open(fn,O_RDONLY))>=0){ 
        printf("\n\n[%s]\n",fn);
        printf("%-15s %-6s %-15s %-4s %-15s\n","Name","id","Line","Type","Host");
        printf("--------------------------------------------------------------\n");
		while(read (f, &utmpx_ent, sizeof (utmpx_ent))>0){
			strncpy(buf,utmpx_ent.ut_id,4);
			buf[4]=0;
            printf("%-15s %-6s %-15s %4d %-15s\n",utmpx_ent.ut_user,buf,utmpx_ent.ut_line,utmpx_ent.ut_type,utmpx_ent.ut_host);
		}
		close(f);
	}else 
        printf("Logfile %s can not be opened\n",WTMPX_NAME);
} 

void display_lastlog(char *fn) 
{ 
	int f,uid; 
	struct lastlog newll; 
	struct passwd *pwd;

	if ((f=open(fn, O_RDONLY)) >= 0) { 
		printf("\n\n[%s]\n",LASTLOG_NAME);
        printf("%-10s : %-15s %-15s %s\n","Name","Host","Line","Time");
		printf("-----------------------------------------------------------------------\n");
		uid=0;
		while(read (f, &newll, sizeof (newll))>0){
			uid++;
			if (newll.ll_time==0) continue;
			pwd=getpwuid(uid-1);
            printf("%-10s : %-15s %-15s %s",pwd->pw_name,newll.ll_host,newll.ll_line,asctime(localtime(&newll.ll_time)));
		}
		close(f);
	}else
		printf("Logfile %s can not be opened\n",LASTLOG_NAME); 
} 
main()             
{
    display_wtmp (WTMP_NAME); 
    display_wtmpx(WTMPX_NAME); 
    display_utmp (UTMP_NAME); 
    display_utmpx(UTMPX_NAME);
    display_lastlog(LASTLOG_NAME); 
}