/*
     Lastx v1.0    Written by Ryan Wyler  (ryanw@goodnet.com)
 
    
Decription:
 
    A 'last' type utility for Solaris which displays the full information
for the users.
 
Why:
 
    The version of Solaris which I run here (Solaris 2.5 Sparc) does not
log the whole IP of the users in the file that 'last' uses to display the
information (/var/adm/tmpx).  But it does store the full IP in the
/var/adm/wtmpx file.  So this program helps me to findout where people are
logging in from A LOT easier.  
 
Disclamer:
 
    If this breaks something.. don't come crying to me.. I'm not
    responsable for nutin.. 
 
 
Distibution:
 
     Feel Free to distribute this to whom ever can make use of this util.
     It has helped me out a ton. :)
 
     I have not added in any comments due to lack of time.  Sorry.
     I welcome comments/Suggestions to make it better if you care to send
     any.  Otherwise, use at will.
 
*/

#include <stdio.h>
#include <utmpx.h>
#include <sys/types.h>
#include <fcntl.h>
#define WTMP "/var/adm/wtmpx"
#define UTMP "/var/adm/utmpx"

void nl()
{
  printf("\n");
}

void main(argc,argv)
int argc;
char *argv[];
{
  struct utmpx utmp_ent;
  char *date="",*ch,user;
  int f,count=0,all=0,debug=0,x=1,success=0,other_file=0,help=0,done=0;

  nl();
  printf(" Lastx v1.0    Written by Ryan Wyler (ryanw@goodnet.com)");
  nl();
  nl();
  if(argc>1)
    if(strcmp(argv[1],"-h")==0)
      {
        help=1;
        done=1;
      }
  if((argc > 1)&&(!done))
    {
      do
        {
          if(strcmp(argv[x],"-a")==0)
            all=1;
          else
            if(strcmp(argv[x],"-d")==0)
              debug=1;
            else
              if(strcmp(argv[x],"-f")==0)
                {
                  other_file=1;
                  if(argc>x+1)
                    {
                      x++;
                      if((f=open(argv[x],O_RDWR))>=0)
                        success=1;
                      else
                        printf("  Error:  Check filename/path for '%s'\n\n",argv[x]);
                    }
                  else
                    printf("  Error:  -f specified, but no filename followed -f\n\nexiting...\n");
                }
              else
                strcpy(&user,argv[x]);
          x++;
        }
      while(x < argc);
    }
  if((argc > 1)&&(!done))
    {
      if(all==1)
        {
          if(other_file==0)
            if((f=open(WTMP,O_RDWR))>=0)
              success=1;
            else
              printf("  Error:  Check filename/path:  %s\n\n",WTMP);
          if(success==1)
            {
              while(read(f,&utmp_ent,sizeof(utmp_ent)))
                if(strncmp(utmp_ent.ut_user,".",1)!=0)
                  {
                    if(count==0)
                      printf("  User        IP Address         (to see time specify specific user)\n");
                    printf("  %s  %s\n",utmp_ent.ut_user,utmp_ent.ut_host);
                    count++;
                  }
              nl();
              printf("There were %i records listed",count);
              nl();
              close(f);
            }
        }
      else
        {
          if(debug==1)
            {
              if(other_file==0)
                if((f=open(WTMP,O_RDWR))>=0)
                  success=1;
                else
                  printf("  Error:  Check filename/path:  %s\n\n",WTMP);
              if(success==1)
                {
                  while(read(f,&utmp_ent,sizeof(utmp_ent)))
                    {
                      if(count==0)
                        printf("  User        IP Address         (to see time specify specific user)\n");
                      printf("  %s  %s\n",utmp_ent.ut_user,utmp_ent.ut_host);
                      count++;
                    }
                  nl();
                  printf("There were %i records listed",count);
                  nl();
                  close(f);
                }
            }
          else
            {
              if(other_file==0)
                if((f=open(WTMP,O_RDWR))>=0)
                  success=1;
                else
                  printf("  Error:  Check filename/path:  %s\n\n",WTMP);
              if(success==1)
                {
                  while(read(f,&utmp_ent,sizeof(utmp_ent)))
                    if(!strcmp(utmp_ent.ut_name, &user))
                      {
                        if(count==0)
                          printf("  User        IP Address             Time\n");
                        date = ctime(&utmp_ent.ut_xtime);
                        date[strlen(date)-1] = '\0';
                        printf("  %s  %s  %s\n",utmp_ent.ut_user,utmp_ent.ut_host,date);
                        count++;
                      }
                  nl();
                  printf("There were %i records listed",count);
                  nl();
                  close(f);
                }
            }
        }
    }
  else
    {
      printf("   Usage: %s <-h | -a | -d | [username]> <-f [filename]>",argv[0]);
      nl();
      printf(" Options:  -a     Display all users");
      nl();
      printf("           -d     Display all Entrys");
      nl();
      printf("           user   Displays entries for only that user");
      nl();
      printf("           -f     Specify a specific wtmpx file to use");
      nl();
      printf("           -h     Extended help (examples) %i",help);
      nl();
      nl();
      if(help==1)
        {
          printf(" Examples:");
          nl();
          printf("   %s ryanw",argv[0]);
          nl();
          printf("     Shows all logins for ryanw");
          nl();
          nl();
          printf("   %s -a",argv[0]);
          nl();
          printf("     Shows all records in wtmpx file");
          nl();
          nl();
          printf("   %s -d",argv[0]);
          nl();
          printf("     Shows even MORE records in wtmpx file");
          nl();
          nl();
          printf("   %s -f /var/adm/backup/wtmp.1 ryanw",argv[0]);
          nl();
          printf("     Shows all logins of user ryanw in file /var/adm/backup/wtmp.1");
          nl();
          nl();
          printf("   %s -a -f <filename>",argv[0]);
          nl();
          printf("     Shows all records in <filename>");
          nl();
        }
    }
  exit(0);
}