/*
** this is extracted from:
**  http://securitydigest.org/tcp-ip/archive/1988/11
*/

/*
 * Copyright (c) 1983 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)fingerd.c5.3 (Berkeley) 11/3/88";
#endif /* not lint */

/*
 * Finger server.
 */
#include <sys/types.h>
#include <netinet/in.h>
#include <stdio.h>
#include <ctype.h>

main(argc, argv)
int argc;
char *argv[];
{
  register char *sp;
  char line[512];
  struct sockaddr_in sin;
  int i, p[2], pid, status;
  FILE *fp;
  char *av[4];

  i = sizeof (sin);
 if (getpeername(0, &sin, &i) < 0)
   fatal(argv[0], "getpeername");
 if (fgets(line, sizeof(line), stdin) == NULL)
   exit(1);
 sp = line;
 av[0] = "finger";
 for (i = 1;;) {
   while (isspace(*sp))
     sp++;
   if (!*sp)
     break;
   if (*sp == '/' && (sp[1] == 'W' || sp[1] == 'w')) {
     sp += 2;
     av[i++] = "-l";
     }
   if (*sp && !isspace(*sp)) {
     av[i++] = sp;
     while (*sp && !isspace(*sp))
       sp++;
     *sp = '\0';
     }
   }
 av[i] = 0;
 if (pipe(p) < 0)
   fatal(argv[0], "pipe");
 if ((pid = fork()) == 0) {
   close(p[0]);
   if (p[1] != 1) {
     dup2(p[1], 1);
     close(p[1]);
     }
   execv("/usr/ucb/finger", av);
   _exit(1);
   }
 if (pid == -1)
   fatal(argv[0], "fork");
 close(p[1]);
 if ((fp = fdopen(p[0], "r")) == NULL)
   fatal(argv[0], "fdopen");
 while ((i = getc(fp)) != EOF) {
   if (i == '\n')
     putchar('\r');
   putchar(i);
   }
 fclose(fp);
 while ((i = wait(&status)) != pid && i != -1)
   ;
 return(0);
 }

fatal(prog, s)
     char *prog, *s;
     {
       fprintf(stderr, "%s: ", prog);
       perror(s);
       exit(1);
     }