#include <stdio.h>
#include <stdlib.h>
#include <pwd.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>

int main(argc,argv)

     int argc;
     char *argv[];

{

  int euid;
  struct passwd *p;
  char *user;

  euid=geteuid();
  seteuid(geteuid());

  if (argc != 2) {
    fprintf(stderr, "Usage: %s netid\n", argv[0]);
    exit(1);
  }

  if (strlen(argv[1]) > 8) {
    fprintf(stderr, "Username too long.\nUsage: %s netid\n", argv[0]);
    exit(1);
  }

  /* make sure the user exists */
  if ((p=getpwnam(argv[1])) == NULL) {
    fprintf(stderr, "Username %s does not exist!\nUsage: %s netid\n", argv[1], argv[0]);
  }
  
  /* only check quotas of users with uid 100 or above */
  if (p->pw_uid < 100) {
    fprintf(stderr, "You may not check that user's quota.\nUsage: %s netid\n", argv[0]);
    exit(1);
  }
  
  /*
   * set our real/effective uid to that of the user we're checking and
   * run the real quota program
   */

  if (0 != seteuid(euid)) {
      fprintf(stderr, "Could not set euid\n");
	  perror("magicquota: seteuid");
	  exit(1);
  }

  /*
   * quota -v will fail silently if the homedir is not mounted.
   * changing to the user's home directory will force an automount.
   */

  if (chdir(p->pw_dir) != 0) {
	  fprintf(stderr, "Could not change to the user's homedir.\n");
	  perror("magicquota: chdir");
  }

  execl("/usr/sbin/quota","quota","-v",argv[1],NULL);

  fprintf(stderr, "exec failed!\n");

  exit(1);

}