/*
 * 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 EXPRESS 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.c	5.3 (Berkeley) 11/3/88";
#endif /* not lint */

/*
 * Finger ID: This version of fingerd has been adjusted to record finger 
 * requests on the system console or in the syslog at priority "auth.notice".  
 * To actually see these messages you need to add a line to /etc/syslog.conf
 * containing something like:
 *         auth.notice    /dev/console
 * See syslogd(1) and/or syslog.conf(5) for more info.
 *
 * 7 Feb 1999 - updated for Linux:  Compile with -DLINUX to find the
 * correct finger command on Linux.
 *
 * Eric Myers <myers@umich.edu>   3 December 1994
 * Department of Physics, University of Michigan, Ann Arbor, MI USA
 */
#ifndef lint
char rcsid[] = 
  "@(#) Hacked to record finger requests in syslog or to console.\n\
   @(#) $Revision: 1.6 $               $Date: 1999/02/07 20:02:54 $\n";
#endif /* not lint */


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

/*
 * System logging.
 */
#include <syslog.h>
#include <netdb.h>		/* hostent, gethostbyaddr  */
#include <arpa/inet.h>		/* in_addr */
#define AF_INET         2	/* internetwork: UDP, TCP, etc. */

#ifdef _HPUX_SOURCE
#define FINGERCMD "/usr/bin/finger"
#else
#ifdef LINUX
#define FINGERCMD "/usr/bin/finger"
#else
#define FINGERCMD "/usr/ucb/finger"
#endif
#endif

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];

	struct in_addr HostAddr; 
	struct hostent *host;
	char *HostName;

	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;i<3;) {

	  while (isspace(*sp)) sp++; /* ignore leading whitespace */

	  if (!*sp) break;

	  if (*sp == '\r') *sp = '\0';

	  if (*sp == '/' && (sp[1] == 'W' || sp[1] == 'w')) {
	    sp += 2;
	    av[i++] = "-l";
	  }
	  
	  if (*sp && !isspace(*sp)) {
	    av[i++] = sp;
	    while (*sp && !isspace(*sp)) {
	      if (*sp == '\r') *sp = '\0';
	      if (*sp == '@')  *sp = '\0';   /* no finger relay */
	      sp++;}
	    *sp = '\0';
	  }
	}
	av[i] = 0;
/*
 * Log the request to syslog as auth.notice.  You may have to
 * add a line to /etc/syslog.conf for this to actually appear 
 * on the console.  
 */
	openlog("fingerd", LOG_CONS, LOG_AUTH); 

	HostAddr = sin.sin_addr;	/* get peer's IP address */

	host = gethostbyaddr((char *)&HostAddr, sizeof(HostAddr), AF_INET);
	if (host == NULL ) 
	  HostName = inet_ntoa(HostAddr);
	else 
	  HostName = host->h_name;

 	syslog(LOG_NOTICE|LOG_AUTH,"from %s: `finger %s`", HostName, line );

/*
 * Fork into a pipe and run the finger request
 */
	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(FINGERCMD, av);
		_exit(1);
	}

	if (pid == -1) fatal(argv[0], "fork");

	close(p[1]);

	/* Copy from the pipe output to stdout */

	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);
}