tcpd - zygaena/hammerhead

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#
# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
# Use is subject to license terms.
#
# Copyright 2011 Nexenta Systems, Inc. All rights reserved.
#
# Copyright (c) 2018, Joyent, Inc.

PROG=		safe_finger tcpd tcpdchk tcpdmatch try-from

include		../Makefile.cmd

CFLAGS +=	$(CCVERBOSE)
CPPFLAGS +=	$(ACCESS) $(PARANOID) $(NETGROUP) $(TLI) \
		$(UMASK) $(STYLE) $(TABLES) $(KILL_OPT) $(BUGS) \
		-DRFC931_TIMEOUT=$(RFC931_TIMEOUT) \
		-DFACILITY=$(FACILITY) -DSEVERITY=$(SEVERITY) \
		-DREAL_DAEMON_DIR=\"$(REAL_DAEMON_DIR)\" \
		-I../../lib/libwrap
tcpd tcpdmatch try-from : \
		LDLIBS += -lwrap
tcpdchk :	LDLIBS += -lwrap -lnsl

CERRWARN +=	-Wno-unused-variable
CERRWARN +=	-Wno-parentheses
CERRWARN +=	$(CNOWARN_UNINIT)
CERRWARN +=	-Wno-implicit-function-declaration
CERRWARN +=	-Wno-return-type
CERRWARN +=	-Wno-clobbered

# Hammerhead: Suppress pointer/int cast warnings in legacy tcpd code
CERRWARN +=	-Wno-int-to-pointer-cast

# not linted
SMATCH=off

# Various components must export interfaces, but also contain name-space
# clashes with system libraries.
MAPFILE.INT.D=	$(MAPFILE.NGB) mapfile-intf-tcpdchk
MAPFILE.INT.M=	$(MAPFILE.NGB) mapfile-intf-tcpdmatch
MAPFILE.INT.F=	$(MAPFILE.NGB) mapfile-intf-tryfrom

tcpdchk :	LDFLAGS +=$(MAPFILE.INT.D:%=-Wl,-M%)
tcpdmatch :	LDFLAGS +=$(MAPFILE.INT.M:%=-Wl,-M%)
try-from :	LDFLAGS +=$(MAPFILE.INT.F:%=-Wl,-M%)

.KEEP_STATE:

all:		$(PROG)

install:	all $(ROOTUSRSBINPROG)

clean:
		$(RM) *.o

TCPDMATCH_OBJ=	tcpdmatch.o fakelog.o inetcf.o scaffold.o

tcpdmatch:	$(TCPDMATCH_OBJ) $(LIB) $(MAPFILE.INTF.M)
		$(LINK.c) -o $@ $(TCPDMATCH_OBJ) $(LDLIBS)
		$(POST_PROCESS)

try-from:	try-from.o fakelog.o $(LIB) $(MAPFILE.INTF.F)
		$(LINK.c) -o $@ try-from.o fakelog.o $(LDLIBS)
		$(POST_PROCESS)

TCPDCHK_OBJ=	tcpdchk.o fakelog.o inetcf.o scaffold.o

tcpdchk:	$(TCPDCHK_OBJ) $(LIB) $(MAPFILE.INTF.C)
		$(LINK.c) -o $@ $(TCPDCHK_OBJ) $(LDLIBS)
		$(POST_PROCESS)

include		../Makefile.targ

# The rest of this file contains definitions more-or-less directly from the
# original Makefile of the tcp_wrappers distribution.

##############################
# System parameters appropriate for Solaris 9

REAL_DAEMON_DIR	= /usr/sbin
TLI		= -DTLI
NETGROUP	= -DNETGROUP

##############################
# Start of the optional stuff.

###########################################
# Optional: Turning on language extensions
#
# Instead of the default access control language that is documented in
# the hosts_access.5 document, the wrappers can be configured to
# implement an extensible language documented in the hosts_options.5
# document.  This language is implemented by the "options.c" source
# module, which also gives hints on how to add your own extensions.
# Uncomment the next definition to turn on the language extensions
# (examples: allow, deny, banners, twist and spawn).
#
STYLE	= -DPROCESS_OPTIONS	# Enable language extensions.

################################################################
# Optional: Changing the default disposition of logfile records
#
# By default, logfile entries are written to the same file as used for
# sendmail transaction logs. See your /etc/syslog.conf file for actual
# path names of logfiles. The tutorial section in the README file
# gives a brief introduction to the syslog daemon.
#
# Change the FACILITY definition below if you disagree with the default
# disposition. Some syslog versions (including Ultrix 4.x) do not provide
# this flexibility.
#
# If nothing shows up on your system, it may be that the syslog records
# are sent to a dedicated loghost. It may also be that no syslog daemon
# is running at all. The README file gives pointers to surrogate syslog
# implementations for systems that have no syslog library routines or
# no syslog daemons. When changing the syslog.conf file, remember that
# there must be TABs between fields.
#
# The LOG_XXX names below are taken from the /usr/include/syslog.h file.

FACILITY= LOG_MAIL	# LOG_MAIL is what most sendmail daemons use

# The syslog priority at which successful connections are logged.

SEVERITY= LOG_INFO	# LOG_INFO is normally not logged to the console

######################################################
# Optional: Changing the default file protection mask
#
# On many systems, network daemons and other system processes are started
# with a zero umask value, so that world-writable files may be produced.
# It is a good idea to edit your /etc/rc* files so that they begin with
# an explicit umask setting.  On our site we use `umask 022' because it
# does not break anything yet gives adequate protection against tampering.
#
# The following macro specifies the default umask for processes run under
# control of the daemon wrappers. Comment it out only if you are certain
# that inetd and its children are started with a safe umask value.

UMASK	= -DDAEMON_UMASK=022

#######################################
# Optional: Turning off access control
#
# By default, host access control is enabled.  To disable host access
# control, comment out the following definition.  Host access control
# can also be turned off at runtime by providing no or empty access
# control tables.

ACCESS	= -DHOSTS_ACCESS

####################################################
# Optional: dealing with host name/address conflicts
#
# By default, the software tries to protect against hosts that claim to
# have someone elses host name. This is relevant for network services
# whose authentication depends on host names, such as rsh and rlogin.
#
# With paranoid mode on, connections will be rejected when the host name
# does not match the host address. Connections will also be rejected when
# the host name is available but cannot be verified.
#
# Comment out the following definition if you want more control over such
# requests. When paranoid mode is off and a host name double check fails,
# the client can be matched with the PARANOID access control pattern.
#
# Paranoid mode implies hostname lookup. In order to disable hostname
# lookups altogether, see the next section.

PARANOID= -DPARANOID

# The default username lookup timeout is 10 seconds. This may not be long
# enough for slow hosts or networks, but is enough to irritate PC users.

RFC931_TIMEOUT = 10

########################################################
# Optional: Changing the access control table pathnames
#
# The HOSTS_ALLOW and HOSTS_DENY macros define where the programs will
# look for access control information. Watch out for the quotes and
# backslashes when you make changes.

TABLES	= -DHOSTS_DENY=\"/etc/hosts.deny\" -DHOSTS_ALLOW=\"/etc/hosts.allow\"

#############################################
# Optional: Turning on host ADDRESS checking
#
# Optionally, the software tries to protect against hosts that pretend to
# have someone elses host address. This is relevant for network services
# whose authentication depends on host names, such as rsh and rlogin,
# because the network address is used to look up the remote host name.
#
# The protection is to refuse TCP connections with IP source routing
# options.
#
# This feature cannot be used with SunOS 4.x because of a kernel bug in
# the implementation of the getsockopt() system call. Kernel panics have
# been observed for SunOS 4.1.[1-3]. Symptoms are "BAD TRAP" and "Data
# fault" while executing the tcp_ctloutput() kernel function.
#
# Reportedly, Sun patch 100804-03 or 101790 fixes this for SunOS 4.1.x.
#
# Uncomment the following macro definition if your getsockopt() is OK.
#
# -DKILL_IP_OPTIONS is not needed on modern UNIX systems that can stop
# source-routed traffic in the kernel. Examples: 4.4BSD derivatives,
# Solaris 2.x, and Linux. See your system documentation for details.
#
# KILL_OPT= -DKILL_IP_OPTIONS

## End configuration options
############################
* Copyright 1995 by Wietse Venema.  All rights reserved.  Some individual
* files may be covered by other copyrights.
*
* This material was originally written and compiled by Wietse Venema at
* Eindhoven University of Technology, The Netherlands, in 1990, 1991,
* 1992, 1993, 1994 and 1995.
*
* Redistribution and use in source and binary forms are permitted
* provided that this entire copyright notice is duplicated in all such
* copies.
*
* This software is provided "as is" and without any expressed or implied
* warranties, including, without limitation, the implied warranties of
* merchantibility and fitness for any particular purpose.
TCP WRAPPER SOFTWARE
 /*
  * This module intercepts syslog() library calls and redirects their output
  * to the standard output stream. For interactive testing.
  *
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  */

#ifndef lint
static char sccsid[] = "@(#) fakelog.c 1.3 94/12/28 17:42:21";
#endif

#include <stdio.h>

#include "mystdarg.h"

/* openlog - dummy */

/* ARGSUSED */
void
openlog(name, logopt, facility)
char   *name;
int     logopt;
int     facility;
{
    /* void */
}

/* vsyslog - format one record */
void
vsyslog(severity, fmt, ap)
int     severity;
char   *fmt;
va_list ap;
{
    char    buf[BUFSIZ];

    vprintf(percent_m(buf, fmt), ap);
    printf("\n");
    fflush(stdout);
}

/* syslog - format one record */

/* VARARGS */
void
VARARGS(syslog, int, severity)
{
    va_list ap;
    char   *fmt;

    VASTART(ap, int, severity);
    fmt = va_arg(ap, char *);
    vsyslog(severity, fmt, ap);
    VAEND(ap);
}

/* closelog - dummy */
void
closelog()
{
    /* void */
}
#!/bin/sh
#ident	"%Z%%M%	%I%	%E% SMI"
# Copyright (c) 2001 by Sun Microsystems, Inc.
# All rights reserved.

echo_file usr/src/lib/libwrap/mystdarg.h
echo_file usr/src/lib/libwrap/patchlevel.h
 /*
  * Routines to parse an inetd.conf or tlid.conf file. This would be a great
  * job for a PERL script.
  *
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  */

#ifndef lint
static char sccsid[] = "@(#) inetcf.c 1.7 97/02/12 02:13:23";
#endif

#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

extern int errno;
extern void exit();

#include "tcpd.h"
#include "inetcf.h"

 /*
  * Network configuration files may live in unusual places. Here are some
  * guesses. Shorter names follow longer ones.
  */
char   *inet_files[] = {
    "/private/etc/inetd.conf",		/* NEXT */
    "/etc/inet/inetd.conf",		/* SYSV4 */
    "/usr/etc/inetd.conf",		/* IRIX?? */
    "/etc/inetd.conf",			/* BSD */
    "/etc/net/tlid.conf",		/* SYSV4?? */
    "/etc/saf/tlid.conf",		/* SYSV4?? */
    "/etc/tlid.conf",			/* SYSV4?? */
    0,
};

static void inet_chk();
static char *base_name();

 /*
  * Structure with everything we know about a service.
  */
struct inet_ent {
    struct inet_ent *next;
    int     type;
    char    name[1];
};

static struct inet_ent *inet_list = 0;

static char whitespace[] = " \t\r\n";

/* inet_conf - read in and examine inetd.conf (or tlid.conf) entries */

char   *inet_cfg(conf)
char   *conf;
{
    char    buf[BUFSIZ];
    FILE   *fp;
    char   *service;
    char   *protocol;
    char   *user;
    char   *path;
    char   *arg0;
    char   *arg1;
    struct tcpd_context saved_context;
    char   *percent_m();
    int     i;
    struct stat st;

    saved_context = tcpd_context;

    /*
     * The inetd.conf (or tlid.conf) information is so useful that we insist
     * on its availability. When no file is given run a series of educated
     * guesses.
     */
    if (conf != 0) {
	if ((fp = fopen(conf, "r")) == 0) {
	    fprintf(stderr, percent_m(buf, "open %s: %m\n"), conf);
	    exit(1);
	}
    } else {
	for (i = 0; inet_files[i] && (fp = fopen(inet_files[i], "r")) == 0; i++)
	     /* void */ ;
	if (fp == 0) {
	    fprintf(stderr, "Cannot find your inetd.conf or tlid.conf file.\n");
	    fprintf(stderr, "Please specify its location.\n");
	    exit(1);
	}
	conf = inet_files[i];
	check_path(conf, &st);
    }

    /*
     * Process the file. After the 7.0 wrapper release it became clear that
     * there are many more inetd.conf formats than the 8 systems that I had
     * studied. EP/IX uses a two-line specification for rpc services; HP-UX
     * permits long lines to be broken with backslash-newline.
     */
    tcpd_context.file = conf;
    tcpd_context.line = 0;
    while (xgets(buf, sizeof(buf), fp)) {
	service = strtok(buf, whitespace);	/* service */
	if (service == 0 || *service == '#')
	    continue;
	if (STR_NE(service, "stream") && STR_NE(service, "dgram"))
	    strtok((char *) 0, whitespace);	/* endpoint */
	protocol = strtok((char *) 0, whitespace);
	(void) strtok((char *) 0, whitespace);	/* wait */
	if ((user = strtok((char *) 0, whitespace)) == 0)
	    continue;
	if (user[0] == '/') {			/* user */
	    path = user;
	} else {				/* path */
	    if ((path = strtok((char *) 0, whitespace)) == 0)
		continue;
	}
	if (path[0] == '?')			/* IRIX optional service */
	    path++;
	if (STR_EQ(path, "internal"))
	    continue;
	if (path[strspn(path, "-0123456789")] == 0) {

	    /*
	     * ConvexOS puts RPC version numbers before path names. Jukka
	     * Ukkonen <ukkonen@csc.fi>.
	     */
	    if ((path = strtok((char *) 0, whitespace)) == 0)
		continue;
	}
	if ((arg0 = strtok((char *) 0, whitespace)) == 0) {
	    tcpd_warn("incomplete line");
	    continue;
	}
	if (arg0[strspn(arg0, "0123456789")] == 0) {

	    /*
	     * We're reading a tlid.conf file, the format is:
	     *
	     * ...stuff... path arg_count arguments mod_count modules
	     */
	    if ((arg0 = strtok((char *) 0, whitespace)) == 0) {
		tcpd_warn("incomplete line");
		continue;
	    }
	}
	if ((arg1 = strtok((char *) 0, whitespace)) == 0)
	    arg1 = "";

	inet_chk(protocol, path, arg0, arg1);
    }
    fclose(fp);
    tcpd_context = saved_context;
    return (conf);
}

/* inet_chk - examine one inetd.conf (tlid.conf?) entry */

static void inet_chk(protocol, path, arg0, arg1)
char   *protocol;
char   *path;
char   *arg0;
char   *arg1;
{
    char    daemon[BUFSIZ];
    struct stat st;
    int     wrap_status = WR_MAYBE;
    char   *base_name_path = base_name(path);
    char   *tcpd_proc_name = (arg0[0] == '/' ? base_name(arg0) : arg0);

    /*
     * Always warn when the executable does not exist or when it is not
     * executable.
     */
    if (check_path(path, &st) < 0) {
	tcpd_warn("%s: not found: %m", path);
    } else if ((st.st_mode & 0100) == 0) {
	tcpd_warn("%s: not executable", path);
    }

    /*
     * Cheat on the miscd tests, nobody uses it anymore.
     */
    if (STR_EQ(base_name_path, "miscd")) {
	inet_set(arg0, WR_YES);
	return;
    }

    /*
     * While we are here...
     */
    if (STR_EQ(tcpd_proc_name, "rexd") || STR_EQ(tcpd_proc_name, "rpc.rexd"))
	tcpd_warn("%s may be an insecure service", tcpd_proc_name);

    /*
     * The tcpd program gets most of the attention.
     */
    if (STR_EQ(base_name_path, "tcpd")) {

	if (STR_EQ(tcpd_proc_name, "tcpd"))
	    tcpd_warn("%s is recursively calling itself", tcpd_proc_name);

	wrap_status = WR_YES;

	/*
	 * Check: some sites install the wrapper set-uid.
	 */
	if ((st.st_mode & 06000) != 0)
	    tcpd_warn("%s: file is set-uid or set-gid", path);

	/*
	 * Check: some sites insert tcpd in inetd.conf, instead of replacing
	 * the daemon pathname.
	 */
	if (arg0[0] == '/' && STR_EQ(tcpd_proc_name, base_name(arg1)))
	    tcpd_warn("%s inserted before %s", path, arg0);

	/*
	 * Check: make sure files exist and are executable. On some systems
	 * the network daemons are set-uid so we cannot complain. Note that
	 * tcpd takes the basename only in case of absolute pathnames.
	 */
	if (arg0[0] == '/') {			/* absolute path */
	    if (check_path(arg0, &st) < 0) {
		tcpd_warn("%s: not found: %m", arg0);
	    } else if ((st.st_mode & 0100) == 0) {
		tcpd_warn("%s: not executable", arg0);
	    }
	} else {				/* look in REAL_DAEMON_DIR */
	    sprintf(daemon, "%s/%s", REAL_DAEMON_DIR, arg0);
	    if (check_path(daemon, &st) < 0) {
		tcpd_warn("%s: not found in %s: %m",
			  arg0, REAL_DAEMON_DIR);
	    } else if ((st.st_mode & 0100) == 0) {
		tcpd_warn("%s: not executable", daemon);
	    }
	}

    } else {

	/*
	 * No tcpd program found. Perhaps they used the "simple installation"
	 * recipe. Look for a file with the same basename in REAL_DAEMON_DIR.
	 * Draw some conservative conclusions when a distinct file is found.
	 */
	sprintf(daemon, "%s/%s", REAL_DAEMON_DIR, arg0);
	if (STR_EQ(path, daemon)) {
	    wrap_status = WR_NOT;
	} else if (check_path(daemon, &st) >= 0) {
	    wrap_status = WR_MAYBE;
	} else if (errno == ENOENT) {
	    wrap_status = WR_NOT;
	} else {
	    tcpd_warn("%s: file lookup: %m", daemon);
	    wrap_status = WR_MAYBE;
	}
    }

    /*
     * Alas, we cannot wrap rpc/tcp services.
     */
    if (wrap_status == WR_YES && STR_EQ(protocol, "rpc/tcp"))
	tcpd_warn("%s: cannot wrap rpc/tcp services", tcpd_proc_name);

    inet_set(tcpd_proc_name, wrap_status);
}

/* inet_set - remember service status */

void    inet_set(name, type)
char   *name;
int     type;
{
    struct inet_ent *ip =
    (struct inet_ent *) malloc(sizeof(struct inet_ent) + strlen(name));

    if (ip == 0) {
	fprintf(stderr, "out of memory\n");
	exit(1);
    }
    ip->next = inet_list;
    strcpy(ip->name, name);
    ip->type = type;
    inet_list = ip;
}

/* inet_get - look up service status */

int     inet_get(name)
char   *name;
{
    struct inet_ent *ip;

    if (inet_list == 0)
	return (WR_MAYBE);

    for (ip = inet_list; ip; ip = ip->next)
	if (STR_EQ(ip->name, name))
	    return (ip->type);

    return (-1);
}

/* base_name - compute last pathname component */

static char *base_name(path)
char   *path;
{
    char   *cp;

    if ((cp = strrchr(path, '/')) != 0)
	path = cp + 1;
    return (path);
}
 /*
  * @(#) inetcf.h 1.1 94/12/28 17:42:30
  *
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  */

extern char *inet_cfg();		/* read inetd.conf file */
extern void inet_set();			/* remember internet service */
extern int inet_get();			/* look up internet service */

#define WR_UNKNOWN	(-1)		/* service unknown */
#define WR_NOT		1		/* may not be wrapped */
#define WR_MAYBE	2		/* may be wrapped */
#define	WR_YES		3		/* service is wrapped */
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#

#
# Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
#

#
# MAPFILE HEADER START
#
# WARNING:  STOP NOW.  DO NOT MODIFY THIS FILE.
# Object versioning must comply with the rules detailed in
#
#	usr/src/lib/README.mapfiles
#
# You should not be making modifications here until you've read the most current
# copy of that file. If you need help, contact a gatekeeper for guidance.
#
# MAPFILE HEADER END
#

$mapfile_version 2

# tcpdchk interposes on numerous routines, and must export other data
# structures to satisfy external dependency requirements.
SYMBOL_SCOPE {
	global:
		clean_exit		{ FLAGS = INTERPOSE };
		closelog		{ FLAGS = INTERPOSE };
		hosts_access_verbose	{ FLAGS = INTERPOSE };
		hosts_allow_table	{ FLAGS = INTERPOSE };
		hosts_deny_table	{ FLAGS = INTERPOSE };
		openlog			{ FLAGS = INTERPOSE };
		resident		{ FLAGS = INTERPOSE };
		rfc931			{ FLAGS = INTERPOSE };
		rfc931_timeout		{ FLAGS = INTERPOSE };
		shell_cmd		{ FLAGS = INTERPOSE };
		syslog			{ FLAGS = INTERPOSE };
		vsyslog			{ FLAGS = INTERPOSE };

		allow_severity;		# required by libwrap
		deny_severity;		# required by libwrap
};
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#

#
# Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
#

#
# MAPFILE HEADER START
#
# WARNING:  STOP NOW.  DO NOT MODIFY THIS FILE.
# Object versioning must comply with the rules detailed in
#
#	usr/src/lib/README.mapfiles
#
# You should not be making modifications here until you've read the most current
# copy of that file. If you need help, contact a gatekeeper for guidance.
#
# MAPFILE HEADER END
#

$mapfile_version 2

# tcpdmatch interposes on numerous routines, and must export other data
# structures to satisfy external dependency requirements.
SYMBOL_SCOPE {
	global:
		clean_exit		{ FLAGS = INTERPOSE };
		closelog		{ FLAGS = INTERPOSE };
		openlog			{ FLAGS = INTERPOSE };
		rfc931			{ FLAGS = INTERPOSE };
		rfc931_timeout		{ FLAGS = INTERPOSE };
		shell_cmd		{ FLAGS = INTERPOSE };
		syslog			{ FLAGS = INTERPOSE };
		vsyslog			{ FLAGS = INTERPOSE };

		allow_severity;		# required by libwrap
		deny_severity;		# required by libwrap
};
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#

#
# Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
#
# try-from interposes on numerous routines, and must export other data
# structures to satisfy external dependency requirements.

#
# MAPFILE HEADER START
#
# WARNING:  STOP NOW.  DO NOT MODIFY THIS FILE.
# Object versioning must comply with the rules detailed in
#
#	usr/src/lib/README.mapfiles
#
# You should not be making modifications here until you've read the most current
# copy of that file. If you need help, contact a gatekeeper for guidance.
#
# MAPFILE HEADER END
#

$mapfile_version 2

SYMBOL_SCOPE {
	global:
		closelog		{ FLAGS = INTERPOSE };
		openlog			{ FLAGS = INTERPOSE };
		syslog			{ FLAGS = INTERPOSE };
		vsyslog			{ FLAGS = INTERPOSE };

		allow_severity;		# required by libwrap
		deny_severity;		# required by libwrap
};
 /*
  * safe_finger - finger client wrapper that protects against nasty stuff
  * from finger servers. Use this program for automatic reverse finger
  * probes, not the raw finger command.
  *
  * Build with: cc -o safe_finger safe_finger.c
  *
  * The problem: some programs may react to stuff in the first column. Other
  * programs may get upset by thrash anywhere on a line. File systems may
  * fill up as the finger server keeps sending data. Text editors may bomb
  * out on extremely long lines. The finger server may take forever because
  * it is somehow wedged. The code below takes care of all this badness.
  *
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  */

/* System libraries */

#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <pwd.h>

extern void exit();

/* Local stuff */

char    path[] = "PATH=/bin:/sbin:/usr/bin:/usr/sbin";

#define	TIME_LIMIT	60		/* Do not keep listinging forever */
#define	INPUT_LENGTH	100000		/* Do not keep listinging forever */
#define	LINE_LENGTH	128		/* Editors can choke on long lines */
#define	FINGER_PROGRAM	"finger"	/* Most, if not all, UNIX systems */
#define	UNPRIV_NAME	"nobody"	/* Preferred privilege level */
#define	UNPRIV_UGID	32767		/* Default uid and gid */

void    perror_exit(char *text) __NORETURN;
int     finger_pid;

void    cleanup(sig)
int     sig;
{
    kill(finger_pid, SIGKILL);
    exit(0);
}

int
main(argc, argv)
int     argc;
char  **argv;
{
    int     c;
    int     line_length = 0;
    int     finger_status;
    int     wait_pid;
    int     input_count = 0;
    struct passwd *pwd;

    /*
     * First of all, let's don't run with superuser privileges.
     */
    if (getuid() == 0 || geteuid() == 0) {
	if ((pwd = getpwnam(UNPRIV_NAME)) && pwd->pw_uid > 0) {
	    setgid(pwd->pw_gid);
	    setuid(pwd->pw_uid);
	} else {
	    setgid(UNPRIV_UGID);
	    setuid(UNPRIV_UGID);
	}
    }

    /*
     * Redirect our standard input through the raw finger command.
     */
    if (putenv(path)) {
	fprintf(stderr, "%s: putenv: out of memory", argv[0]);
	exit(1);
    }
    argv[0] = FINGER_PROGRAM;
    finger_pid = pipe_stdin(argv);

    /*
     * Don't wait forever (Peter Wemm <peter@gecko.DIALix.oz.au>).
     */
    signal(SIGALRM, cleanup);
    (void) alarm(TIME_LIMIT);

    /*
     * Main filter loop.
     */
    while ((c = getchar()) != EOF) {
	if (input_count++ >= INPUT_LENGTH) {	/* don't listen forever */
	    fclose(stdin);
	    printf("\n\n Input truncated to %d bytes...\n", input_count - 1);
	    break;
	}
	if (c == '\n') {			/* good: end of line */
	    putchar(c);
	    line_length = 0;
	} else {
	    if (line_length >= LINE_LENGTH) {	/* force end of line */
		printf("\\\n");
		line_length = 0;
	    }
	    if (line_length == 0) {		/* protect left margin */
		putchar(' ');
		line_length++;
	    }
	    if (isascii(c) && (isprint(c) || isspace(c))) {	/* text */
		if (c == '\\') {
		    putchar(c);
		    line_length++;
		}
		putchar(c);
		line_length++;
	    } else {				/* quote all other thash */
		printf("\\%03o", c & 0377);
		line_length += 4;
	    }
	}
    }

    /*
     * Wait until the finger child process has terminated and account for its
     * exit status. Which will always be zero on most systems.
     */
    while ((wait_pid = wait(&finger_status)) != -1 && wait_pid != finger_pid)
	 /* void */ ;
    return (wait_pid != finger_pid || finger_status != 0);
}

/* perror_exit - report system error text and terminate */

void
perror_exit(char *text)
{
    perror(text);
    exit(1);
}

/* pipe_stdin - pipe stdin through program (from my ANSI to OLD C converter) */

int     pipe_stdin(argv)
char  **argv;
{
    int     pipefds[2];
    int     pid;
    int     i;
    struct stat st;

    /*
     * The code that sets up the pipe requires that file descriptors 0,1,2
     * are already open. All kinds of mysterious things will happen if that
     * is not the case. The following loops makes sure that descriptors 0,1,2
     * are set up properly.
     */

    for (i = 0; i < 3; i++) {
	if (fstat(i, &st) == -1 && open("/dev/null", 2) != i)
	    perror_exit("open /dev/null");
    }

    /*
     * Set up the pipe that interposes the command into our standard input
     * stream.
     */

    if (pipe(pipefds))
	perror_exit("pipe");

    switch (pid = fork()) {
    case -1:					/* error */
	perror_exit("fork");
	/* NOTREACHED */
    case 0:					/* child */
	(void) close(pipefds[0]);		/* close reading end */
	(void) close(1);			/* connect stdout to pipe */
	if (dup(pipefds[1]) != 1)
	    perror_exit("dup");
	(void) close(pipefds[1]);		/* close redundant fd */
	(void) execvp(argv[0], argv);
	perror_exit(argv[0]);
	/* NOTREACHED */
    default:					/* parent */
	(void) close(pipefds[1]);		/* close writing end */
	(void) close(0);			/* connect stdin to pipe */
	if (dup(pipefds[0]) != 0)
	    perror_exit("dup");
	(void) close(pipefds[0]);		/* close redundant fd */
	return (pid);
    }
}
 /*
  * Routines for testing only. Not really industrial strength.
  *
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  */

#ifndef lint
static char sccs_id[] = "@(#) scaffold.c 1.6 97/03/21 19:27:24";
#endif

/* System libraries. */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <syslog.h>
#include <setjmp.h>
#include <string.h>

#ifndef INADDR_NONE
#define	INADDR_NONE	(-1)		/* XXX should be 0xffffffff */
#endif

extern char *malloc();

/* Application-specific. */

#include "tcpd.h"
#include "scaffold.h"

 /*
  * These are referenced by the options module and by rfc931.c.
  */
int     allow_severity = SEVERITY;
int     deny_severity = LOG_WARNING;
int     rfc931_timeout = RFC931_TIMEOUT;

/* dup_hostent - create hostent in one memory block */

static struct hostent *dup_hostent(hp)
struct hostent *hp;
{
    struct hostent_block {
	struct hostent host;
	char   *addr_list[1];
    };
    struct hostent_block *hb;
    int     count;
    char   *data;
    char   *addr;

    for (count = 0; hp->h_addr_list[count] != 0; count++)
	 /* void */ ;

    if ((hb = (struct hostent_block *) malloc(sizeof(struct hostent_block)
			 + (hp->h_length + sizeof(char *)) * count)) == 0) {
	fprintf(stderr, "Sorry, out of memory\n");
	exit(1);
    }
    memset((char *) &hb->host, 0, sizeof(hb->host));
    hb->host.h_addrtype = hp->h_addrtype;;
    hb->host.h_length = hp->h_length;
    hb->host.h_addr_list = hb->addr_list;
    hb->host.h_addr_list[count] = 0;
    data = (char *) (hb->host.h_addr_list + count + 1);

    for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
	hb->host.h_addr_list[count] = data + hp->h_length * count;
	memcpy(hb->host.h_addr_list[count], addr, hp->h_length);
    }
    return (&hb->host);
}

/* find_inet_addr - find all addresses for this host, result to free() */

struct hostent *find_inet_addr(host)
char   *host;
{
    union gen_addr addr;
    struct hostent *hp;
    static struct hostent h;
    static char *addr_list[2];

    /*
     * Host address: translate it to internal form.
     */
    if (numeric_addr(host, &addr, &h.h_addrtype, &h.h_length) != -1) {
	h.h_addr_list = addr_list;
	h.h_addr_list[0] = (char *) &addr;
	return (dup_hostent(&h));
    }

    /*
     * Map host name to a series of addresses. Watch out for non-internet
     * forms or aliases. The NOT_INADDR() is here in case gethostbyname() has
     * been "enhanced" to accept numeric addresses. Make a copy of the
     * address list so that later gethostbyXXX() calls will not clobber it.
     */
    if (NOT_INADDR(host) == 0) {
	tcpd_warn("%s: not an internet address", host);
	return (0);
    }
    if ((hp = tcpd_gethostbyname(host, 0)) == 0) {
	tcpd_warn("%s: host not found", host);
	return (0);
    }
    if (!VALID_ADDRTYPE(hp->h_addrtype)) {
	tcpd_warn("%d: not an internet host", hp->h_addrtype);
	return (0);
    }
    if (STR_NE(host, hp->h_name)) {
	tcpd_warn("%s: hostname alias", host);
	tcpd_warn("(official name: %.*s)", STRING_LENGTH, hp->h_name);
    }
    return (dup_hostent(hp));
}

/* check_dns - give each address thorough workout, return address count */

int     check_dns(host)
char   *host;
{
    struct request_info request;
    struct sockaddr_gen sin;
    struct hostent *hp;
    int     count;
    char   *addr;

    if ((hp = find_inet_addr(host)) == 0)
	return (0);
    request_init(&request, RQ_CLIENT_SIN, &sin, 0);
    sock_methods(&request);
    memset((char *) &sin, 0, sizeof(sin));
    sin.sg_family = hp->h_addrtype;

    for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
	memcpy((char *) SGADDRP(&sin), addr, SGADDRSZ(&sin));

	/*
	 * Force host name and address conversions. Use the request structure
	 * as a cache. Detect hostname lookup problems. Any name/name or
	 * name/address conflicts will be reported while eval_hostname() does
	 * its job.
	 */
	request_set(&request, RQ_CLIENT_ADDR, "", RQ_CLIENT_NAME, "", 0);
	if (STR_EQ(eval_hostname(request.client), unknown))
	    tcpd_warn("host address %s->name lookup failed",
		      eval_hostaddr(request.client));
    }
    free((char *) hp);
    return (count);
}

/* dummy function to intercept the real shell_cmd() */

/* ARGSUSED */

void    shell_cmd(command)
char   *command;
{
    if (hosts_access_verbose)
	printf("command: %s", command);
}

/* dummy function  to intercept the real clean_exit() */

/* ARGSUSED */

void    clean_exit(request)
struct request_info *request;
{
    exit(0);
}

/* dummy function  to intercept the real rfc931() */

/* ARGSUSED */

void    rfc931(request)
struct request_info *request;
{
    strcpy(request->user, unknown);
}

/* check_path - examine accessibility */

int     check_path(path, st)
char   *path;
struct stat *st;
{
    struct stat stbuf;
    char    buf[BUFSIZ];

    if (stat(path, st) < 0)
	return (-1);
#ifdef notdef
    if (st->st_uid != 0)
	tcpd_warn("%s: not owned by root", path);
    if (st->st_mode & 020)
	tcpd_warn("%s: group writable", path);
#endif
    if (st->st_mode & 002)
	tcpd_warn("%s: world writable", path);
    if (path[0] == '/' && path[1] != 0) {
	strrchr(strcpy(buf, path), '/')[0] = 0;
	(void) check_path(buf[0] ? buf : "/", &stbuf);
    }
    return (0);
}
 /*
  * @(#) scaffold.h 1.3 94/12/31 18:19:19
  *
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  */

extern struct hostent *find_inet_addr();
extern int check_dns();
extern int check_path();
 /*
  * General front end for stream and datagram IP services. This program logs
  * the remote host name and then invokes the real daemon. For example,
  * install as /usr/etc/{tftpd,fingerd,telnetd,ftpd,rlogind,rshd,rexecd},
  * after saving the real daemons in the directory specified with the
  * REAL_DAEMON_DIR macro. This arrangement requires that the network daemons
  * are started by inetd or something similar. Connections and diagnostics
  * are logged through syslog(3).
  *
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  */

#ifndef lint
static char sccsid[] = "@(#) tcpd.c 1.10 96/02/11 17:01:32";
#endif

/* System libraries. */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <syslog.h>
#include <string.h>

#ifndef MAXPATHNAMELEN
#define MAXPATHNAMELEN	BUFSIZ
#endif

#ifndef STDIN_FILENO
#define STDIN_FILENO	0
#endif

/* Local stuff. */

#include "patchlevel.h"
#include "tcpd.h"

int     allow_severity = SEVERITY;	/* run-time adjustable */
int     deny_severity = LOG_WARNING;	/* ditto */

int
main(argc, argv)
int     argc;
char  **argv;
{
    struct request_info request;
    char    path[MAXPATHNAMELEN];

    /* Attempt to prevent the creation of world-writable files. */

#ifdef DAEMON_UMASK
    umask(DAEMON_UMASK);
#endif

    /*
     * If argv[0] is an absolute path name, ignore REAL_DAEMON_DIR, and strip
     * argv[0] to its basename.
     */

    if (argv[0][0] == '/') {
	strcpy(path, argv[0]);
	argv[0] = strrchr(argv[0], '/') + 1;
    } else {
	sprintf(path, "%s/%s", REAL_DAEMON_DIR, argv[0]);
    }

    /*
     * Open a channel to the syslog daemon. Older versions of openlog()
     * require only two arguments.
     */

#ifdef LOG_MAIL
    (void) openlog(argv[0], LOG_PID, FACILITY);
#else
    (void) openlog(argv[0], LOG_PID);
#endif

    /*
     * Find out the endpoint addresses of this conversation. Host name
     * lookups and double checks will be done on demand.
     */

    request_init(&request, RQ_DAEMON, argv[0], RQ_FILE, STDIN_FILENO, 0);
    fromhost(&request);

    /*
     * Optionally look up and double check the remote host name. Sites
     * concerned with security may choose to refuse connections from hosts
     * that pretend to have someone elses host name.
     */

#ifdef PARANOID
    if (STR_EQ(eval_hostname(request.client), paranoid))
	refuse(&request);
#endif

    /*
     * The BSD rlogin and rsh daemons that came out after 4.3 BSD disallow
     * socket options at the IP level. They do so for a good reason.
     * Unfortunately, we cannot use this with SunOS 4.1.x because the
     * getsockopt() system call can panic the system.
     */

#ifdef KILL_IP_OPTIONS
    fix_options(&request);
#endif

    /*
     * Check whether this host can access the service in argv[0]. The
     * access-control code invokes optional shell commands as specified in
     * the access-control tables.
     */

#ifdef HOSTS_ACCESS
    if (!hosts_access(&request))
	refuse(&request);
#endif

    /* Report request and invoke the real daemon program. */

    syslog(allow_severity, "connect from %s", eval_client(&request));
    closelog();
    (void) execv(path, argv);
    syslog(LOG_ERR, "error: cannot execute %s: %m", path);
    clean_exit(&request);
    /* NOTREACHED */
}
 /*
  * tcpdchk - examine all tcpd access control rules and inetd.conf entries
  *
  * Usage: tcpdchk [-a] [-d] [-i inet_conf] [-v]
  *
  * -a: complain about implicit "allow" at end of rule.
  *
  * -d: rules in current directory.
  *
  * -i: location of inetd.conf file.
  *
  * -v: show all rules.
  *
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  */

#ifndef lint
static char sccsid[] = "@(#) tcpdchk.c 1.8 97/02/12 02:13:25";
#endif

/* System libraries. */

#include <sys/types.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <syslog.h>
#include <setjmp.h>
#include <errno.h>
#include <netdb.h>
#include <string.h>

extern int errno;
extern void exit();
extern int optind;
extern char *optarg;

#ifndef INADDR_NONE
#define INADDR_NONE     (-1)		/* XXX should be 0xffffffff */
#endif

#ifndef S_ISDIR
#define S_ISDIR(m)	(((m) & S_IFMT) == S_IFDIR)
#endif

/* Application-specific. */

#include "tcpd.h"
#include "inetcf.h"
#include "scaffold.h"

 /*
  * Stolen from hosts_access.c...
  */
static char sep[] = ", \t\n";

#define	BUFLEN 2048

int     resident = 0;
int     hosts_access_verbose = 0;
char   *hosts_allow_table = HOSTS_ALLOW;
char   *hosts_deny_table = HOSTS_DENY;
extern jmp_buf tcpd_buf;

 /*
  * Local stuff.
  */
static void usage();
static void parse_table();
static void print_list();
static void check_daemon_list();
static void check_client_list();
static void check_daemon();
static void check_user();
static int check_host();
static int reserved_name();

#define PERMIT	1
#define DENY	0

#define YES	1
#define	NO	0

static int defl_verdict;
static char *myname;
static int allow_check;
static char *inetcf;

int     main(argc, argv)
int     argc;
char  **argv;
{
    struct request_info request;
    struct stat st;
    int     c;

    myname = argv[0];

    /*
     * Parse the JCL.
     */
    while ((c = getopt(argc, argv, "adi:v")) != EOF) {
	switch (c) {
	case 'a':
	    allow_check = 1;
	    break;
	case 'd':
	    hosts_allow_table = "hosts.allow";
	    hosts_deny_table = "hosts.deny";
	    break;
	case 'i':
	    inetcf = optarg;
	    break;
	case 'v':
	    hosts_access_verbose++;
	    break;
	default:
	    usage();
	    /* NOTREACHED */
	}
    }
    if (argc != optind)
	usage();

    /*
     * When confusion really strikes...
     */
    if (check_path(REAL_DAEMON_DIR, &st) < 0) {
	tcpd_warn("REAL_DAEMON_DIR %s: %m", REAL_DAEMON_DIR);
    } else if (!S_ISDIR(st.st_mode)) {
	tcpd_warn("REAL_DAEMON_DIR %s is not a directory", REAL_DAEMON_DIR);
    }

    /*
     * Process the inet configuration file (or its moral equivalent). This
     * information is used later to find references in hosts.allow/deny to
     * unwrapped services, and other possible problems.
     */
    inetcf = inet_cfg(inetcf);
    if (hosts_access_verbose)
	printf("Using network configuration file: %s\n", inetcf);

    /*
     * These are not run from inetd but may have built-in access control.
     */
    inet_set("portmap", WR_NOT);
    inet_set("rpcbind", WR_NOT);

    /*
     * Check accessibility of access control files.
     */
    (void) check_path(hosts_allow_table, &st);
    (void) check_path(hosts_deny_table, &st);

    /*
     * Fake up an arbitrary service request.
     */
    request_init(&request,
		 RQ_DAEMON, "daemon_name",
		 RQ_SERVER_NAME, "server_hostname",
		 RQ_SERVER_ADDR, "server_addr",
		 RQ_USER, "user_name",
		 RQ_CLIENT_NAME, "client_hostname",
		 RQ_CLIENT_ADDR, "client_addr",
		 RQ_FILE, 1,
		 0);

    /*
     * Examine all access-control rules.
     */
    defl_verdict = PERMIT;
    parse_table(hosts_allow_table, &request);
    defl_verdict = DENY;
    parse_table(hosts_deny_table, &request);
    return (0);
}

/* usage - explain */

static void usage()
{
    fprintf(stderr, "usage: %s [-a] [-d] [-i inet_conf] [-v]\n", myname);
    fprintf(stderr, "	-a: report rules with implicit \"ALLOW\" at end\n");
    fprintf(stderr, "	-d: use allow/deny files in current directory\n");
    fprintf(stderr, "	-i: location of inetd.conf file\n");
    fprintf(stderr, "	-v: list all rules\n");
    exit(1);
}

/* parse_table - like table_match(), but examines _all_ entries */

static void parse_table(table, request)
char   *table;
struct request_info *request;
{
    FILE   *fp;
    int     real_verdict;
    char    sv_list[BUFLEN];		/* becomes list of daemons */
    char   *cl_list;			/* becomes list of requests */
    char   *sh_cmd;			/* becomes optional shell command */
    char    buf[BUFSIZ];
    int     verdict;
    struct tcpd_context saved_context;

    saved_context = tcpd_context;		/* stupid compilers */

    if (fp = fopen(table, "r")) {
	tcpd_context.file = table;
	tcpd_context.line = 0;
	while (xgets(sv_list, sizeof(sv_list), fp)) {
	    if (sv_list[strlen(sv_list) - 1] != '\n') {
		tcpd_warn("missing newline or line too long");
		continue;
	    }
	    if (sv_list[0] == '#' || sv_list[strspn(sv_list, " \t\r\n")] == 0)
		continue;
	    if ((cl_list = split_at(skip_ipv6_addrs(sv_list), ':')) == 0) {
		tcpd_warn("missing \":\" separator");
		continue;
	    }
	    sh_cmd = split_at(skip_ipv6_addrs(cl_list), ':');

	    if (hosts_access_verbose)
		printf("\n>>> Rule %s line %d:\n",
		       tcpd_context.file, tcpd_context.line);

	    if (hosts_access_verbose)
		print_list("daemons:  ", sv_list);
	    check_daemon_list(sv_list);

	    if (hosts_access_verbose)
		print_list("clients:  ", cl_list);
	    check_client_list(cl_list);

#ifdef PROCESS_OPTIONS
	    real_verdict = defl_verdict;
	    if (sh_cmd) {
		verdict = setjmp(tcpd_buf);
		if (verdict != 0) {
		    real_verdict = (verdict == AC_PERMIT);
		} else {
		    dry_run = 1;
		    process_options(sh_cmd, request);
		    if (dry_run == 1 && real_verdict && allow_check)
			tcpd_warn("implicit \"allow\" at end of rule");
		}
	    } else if (defl_verdict && allow_check) {
		tcpd_warn("implicit \"allow\" at end of rule");
	    }
	    if (hosts_access_verbose)
		printf("access:   %s\n", real_verdict ? "granted" : "denied");
#else
	    if (sh_cmd)
		shell_cmd(percent_x(buf, sizeof(buf), sh_cmd, request));
	    if (hosts_access_verbose)
		printf("access:   %s\n", defl_verdict ? "granted" : "denied");
#endif
	}
	(void) fclose(fp);
    } else if (errno != ENOENT) {
	tcpd_warn("cannot open %s: %m", table);
    }
    tcpd_context = saved_context;
}

/* print_list - pretty-print a list */

static void print_list(title, list)
char   *title;
char   *list;
{
    char    buf[BUFLEN];
    char   *cp;
    char   *next;

    fputs(title, stdout);
    strcpy(buf, list);

    for (cp = strtok(buf, sep); cp != 0; cp = next) {
	fputs(cp, stdout);
	next = strtok((char *) 0, sep);
	if (next != 0)
	    fputs(" ", stdout);
    }
    fputs("\n", stdout);
}

/* check_daemon_list - criticize daemon list */

static void check_daemon_list(list)
char   *list;
{
    char    buf[BUFLEN];
    char   *cp;
    char   *host;
    int     daemons = 0;

    strcpy(buf, list);

    for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) {
	if (STR_EQ(cp, "EXCEPT")) {
	    daemons = 0;
	} else {
	    daemons++;
	    if ((host = split_at(cp + 1, '@')) != 0 && check_host(host) > 1) {
		tcpd_warn("host %s has more than one address", host);
		tcpd_warn("(consider using an address instead)");
	    }
	    check_daemon(cp);
	}
    }
    if (daemons == 0)
	tcpd_warn("daemon list is empty or ends in EXCEPT");
}

/* check_client_list - criticize client list */

static void check_client_list(list)
char   *list;
{
    char    buf[BUFLEN];
    char   *cp;
    char   *host;
    int     clients = 0;

    strcpy(buf, list);

    for (cp = strtok(buf, sep); cp != 0; cp = strtok((char *) 0, sep)) {
	if (STR_EQ(cp, "EXCEPT")) {
	    clients = 0;
	} else {
	    clients++;
	    if (host = split_at(cp + 1, '@')) {	/* user@host */
		check_user(cp);
		check_host(host);
	    } else {
		check_host(cp);
	    }
	}
    }
    if (clients == 0)
	tcpd_warn("client list is empty or ends in EXCEPT");
}

/* check_daemon - criticize daemon pattern */

static void check_daemon(pat)
char   *pat;
{
    if (pat[0] == '@') {
	tcpd_warn("%s: daemon name begins with \"@\"", pat);
    } else if (pat[0] == '.') {
	tcpd_warn("%s: daemon name begins with dot", pat);
    } else if (pat[strlen(pat) - 1] == '.') {
	tcpd_warn("%s: daemon name ends in dot", pat);
    } else if (STR_EQ(pat, "ALL") || STR_EQ(pat, unknown)) {
	 /* void */ ;
    } else if (STR_EQ(pat, "FAIL")) {		/* obsolete */
	tcpd_warn("FAIL is no longer recognized");
	tcpd_warn("(use EXCEPT or DENY instead)");
    } else if (reserved_name(pat)) {
	tcpd_warn("%s: daemon name may be reserved word", pat);
    } else {
	switch (inet_get(pat)) {
	case WR_UNKNOWN:
	    tcpd_warn("%s: no such process name in %s", pat, inetcf);
	    inet_set(pat, WR_YES);		/* shut up next time */
	    break;
	case WR_NOT:
	    tcpd_warn("%s: service possibly not wrapped", pat);
	    inet_set(pat, WR_YES);
	    break;
	}
    }
}

/* check_user - criticize user pattern */

static void check_user(pat)
char   *pat;
{
    if (pat[0] == '@') {			/* @netgroup */
	tcpd_warn("%s: user name begins with \"@\"", pat);
    } else if (pat[0] == '.') {
	tcpd_warn("%s: user name begins with dot", pat);
    } else if (pat[strlen(pat) - 1] == '.') {
	tcpd_warn("%s: user name ends in dot", pat);
    } else if (STR_EQ(pat, "ALL") || STR_EQ(pat, unknown)
	       || STR_EQ(pat, "KNOWN")) {
	 /* void */ ;
    } else if (STR_EQ(pat, "FAIL")) {		/* obsolete */
	tcpd_warn("FAIL is no longer recognized");
	tcpd_warn("(use EXCEPT or DENY instead)");
    } else if (reserved_name(pat)) {
	tcpd_warn("%s: user name may be reserved word", pat);
    }
}

/* check_host - criticize host pattern */

static int check_host(pat)
char   *pat;
{
    char   *mask;
    int     addr_count = 1;

    if (pat[0] == '@') {			/* @netgroup */
#ifdef NO_NETGRENT
	/* SCO has no *netgrent() support */
#else
#ifdef NETGROUP
	char   *machinep;
	char   *userp;
	char   *domainp;

	setnetgrent(pat + 1);
	if (getnetgrent(&machinep, &userp, &domainp) == 0)
	    tcpd_warn("%s: unknown or empty netgroup", pat + 1);
	endnetgrent();
#else
	tcpd_warn("netgroup support disabled");
#endif
#endif
#ifdef HAVE_IPV6
    } else if (pat[0] == '[') {
	    struct in6_addr in6;
	    char *cbr = strchr(pat, ']');
	    char *slash = strchr(pat, '/');
	    int err = 0;
	    int mask = IPV6_ABITS;

	    if (slash != NULL) {
		*slash = '\0';
		mask = atoi(slash + 1);
		err = mask < 0 || mask > IPV6_ABITS;
	    }
	    if (cbr == NULL)
		err = 1;
	    else {
		*cbr = '\0';
		err += inet_pton(AF_INET6, pat+1, &in6) != 1;
	    }
	    if (slash) *slash = '/';
	    if (cbr) *cbr = ']';
	    if (err)
		tcpd_warn("bad IP6 address specification: %s", pat);
#endif
    } else if (mask = split_at(pat, '/')) {	/* network/netmask */
	if (dot_quad_addr(pat) == INADDR_NONE
	    || dot_quad_addr(mask) == INADDR_NONE)
	    tcpd_warn("%s/%s: bad net/mask pattern", pat, mask);
    } else if (STR_EQ(pat, "FAIL")) {		/* obsolete */
	tcpd_warn("FAIL is no longer recognized");
	tcpd_warn("(use EXCEPT or DENY instead)");
    } else if (reserved_name(pat)) {		/* other reserved */
	 /* void */ ;
    } else if (NOT_INADDR(pat)) {		/* internet name */
	if (pat[strlen(pat) - 1] == '.') {
	    tcpd_warn("%s: domain or host name ends in dot", pat);
	} else if (pat[0] != '.') {
	    addr_count = check_dns(pat);
	}
    } else {					/* numeric form */
	if (STR_EQ(pat, "0.0.0.0") || STR_EQ(pat, "255.255.255.255")) {
	    /* void */ ;
	} else if (pat[0] == '.') {
	    tcpd_warn("%s: network number begins with dot", pat);
	} else if (pat[strlen(pat) - 1] != '.') {
	    check_dns(pat);
	}
    }
    return (addr_count);
}

/* reserved_name - determine if name is reserved */

static int reserved_name(pat)
char   *pat;
{
    return (STR_EQ(pat, unknown)
	    || STR_EQ(pat, "KNOWN")
	    || STR_EQ(pat, paranoid)
	    || STR_EQ(pat, "ALL")
	    || STR_EQ(pat, "LOCAL"));
}
 /*
  * tcpdmatch - explain what tcpd would do in a specific case
  *
  * usage: tcpdmatch [-d] [-i inet_conf] daemon[@host] [user@]host
  *
  * -d: use the access control tables in the current directory.
  *
  * -i: location of inetd.conf file.
  *
  * All errors are reported to the standard error stream, including the errors
  * that would normally be reported via the syslog daemon.
  *
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  */

#ifndef lint
static char sccsid[] = "@(#) tcpdmatch.c 1.5 96/02/11 17:01:36";
#endif

/* System libraries. */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <syslog.h>
#include <setjmp.h>
#include <string.h>

extern void exit();
extern int optind;
extern char *optarg;

#ifndef	INADDR_NONE
#define	INADDR_NONE	(-1)		/* XXX should be 0xffffffff */
#endif

#ifndef S_ISDIR
#define S_ISDIR(m)	(((m) & S_IFMT) == S_IFDIR)
#endif

/* Application-specific. */

#include "tcpd.h"
#include "inetcf.h"
#include "scaffold.h"

static void usage();
static void tcpdmatch();

/* The main program */

int     main(argc, argv)
int     argc;
char  **argv;
{
    struct hostent *hp;
    char   *myname = argv[0];
    char   *client;
    char   *server;
    char   *addr;
    char   *user;
    char   *daemon;
    struct request_info request;
    int     ch;
    char   *inetcf = 0;
    int     count;
    struct sockaddr_gen server_sin;
    struct sockaddr_gen client_sin;
    struct stat st;

    /*
     * Show what rule actually matched.
     */
    hosts_access_verbose = 2;

    /*
     * Parse the JCL.
     */
    while ((ch = getopt(argc, argv, "di:")) != EOF) {
	switch (ch) {
	case 'd':
	    hosts_allow_table = "hosts.allow";
	    hosts_deny_table = "hosts.deny";
	    break;
	case 'i':
	    inetcf = optarg;
	    break;
	default:
	    usage(myname);
	    /* NOTREACHED */
	}
    }
    if (argc != optind + 2)
	usage(myname);

    /*
     * When confusion really strikes...
     */
    if (check_path(REAL_DAEMON_DIR, &st) < 0) {
	tcpd_warn("REAL_DAEMON_DIR %s: %m", REAL_DAEMON_DIR);
    } else if (!S_ISDIR(st.st_mode)) {
	tcpd_warn("REAL_DAEMON_DIR %s is not a directory", REAL_DAEMON_DIR);
    }

    /*
     * Default is to specify a daemon process name. When daemon@host is
     * specified, separate the two parts.
     */
    if ((server = split_at(argv[optind], '@')) == 0)
	server = unknown;
    if (argv[optind][0] == '/') {
	daemon = strrchr(argv[optind], '/') + 1;
	tcpd_warn("%s: daemon name normalized to: %s", argv[optind], daemon);
    } else {
	daemon = argv[optind];
    }

    /*
     * Default is to specify a client hostname or address. When user@host is
     * specified, separate the two parts.
     */
    if ((client = split_at(argv[optind + 1], '@')) != 0) {
	user = argv[optind + 1];
    } else {
	client = argv[optind + 1];
	user = unknown;
    }

    /*
     * Analyze the inetd (or tlid) configuration file, so that we can warn
     * the user about services that may not be wrapped, services that are not
     * configured, or services that are wrapped in an incorrect manner. Allow
     * for services that are not run from inetd, or that have tcpd access
     * control built into them.
     */
    inetcf = inet_cfg(inetcf);
    inet_set("portmap", WR_NOT);
    inet_set("rpcbind", WR_NOT);
    switch (inet_get(daemon)) {
    case WR_UNKNOWN:
	tcpd_warn("%s: no such process name in %s", daemon, inetcf);
	break;
    case WR_NOT:
	tcpd_warn("%s: service possibly not wrapped", daemon);
	break;
    }

    /*
     * Check accessibility of access control files.
     */
    (void) check_path(hosts_allow_table, &st);
    (void) check_path(hosts_deny_table, &st);

    /*
     * Fill in what we have figured out sofar. Use socket and DNS routines
     * for address and name conversions. We attach stdout to the request so
     * that banner messages will become visible.
     */
    request_init(&request, RQ_DAEMON, daemon, RQ_USER, user, RQ_FILE, 1, 0);
    sock_methods(&request);

    /*
     * If a server hostname is specified, insist that the name maps to at
     * most one address. eval_hostname() warns the user about name server
     * problems, while using the request.server structure as a cache for host
     * address and name conversion results.
     */
    if (NOT_INADDR(server) == 0 || HOSTNAME_KNOWN(server)) {
	if ((hp = find_inet_addr(server)) == 0)
	    exit(1);
	memset((char *) &server_sin, 0, sizeof(server_sin));
	server_sin.sg_family = hp->h_addrtype;
	request_set(&request, RQ_SERVER_SIN, &server_sin, 0);

	for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
	    memcpy((char *) SGADDRP(&server_sin), addr, hp->h_length);

	    /*
	     * Force evaluation of server host name and address. Host name
	     * conflicts will be reported while eval_hostname() does its job.
	     */
	    request_set(&request, RQ_SERVER_NAME, "", RQ_SERVER_ADDR, "", 0);
	    if (STR_EQ(eval_hostname(request.server), unknown))
		tcpd_warn("host address %s->name lookup failed",
			  eval_hostaddr(request.server));
	}
	if (count > 1) {
	    fprintf(stderr, "Error: %s has more than one address\n", server);
	    fprintf(stderr, "Please specify an address instead\n");
	    exit(1);
	}
	free((char *) hp);
    } else {
	request_set(&request, RQ_SERVER_NAME, server, 0);
    }

    /*
     * If a client address is specified, we simulate the effect of client
     * hostname lookup failure.
     */
    if (numeric_addr(client, NULL, NULL, NULL) == 0) {
	request_set(&request, RQ_CLIENT_ADDR, client, 0);
	tcpdmatch(&request);
	exit(0);
    }

    /*
     * Perhaps they are testing special client hostname patterns that aren't
     * really host names at all.
     */
    if (NOT_INADDR(client) && HOSTNAME_KNOWN(client) == 0) {
	request_set(&request, RQ_CLIENT_NAME, client, 0);
	tcpdmatch(&request);
	exit(0);
    }

    /*
     * Otherwise, assume that a client hostname is specified, and insist that
     * the address can be looked up. The reason for this requirement is that
     * in real life the client address is available (at least with IP). Let
     * eval_hostname() figure out if this host is properly registered, while
     * using the request.client structure as a cache for host name and
     * address conversion results.
     */
    if ((hp = find_inet_addr(client)) == 0)
	exit(1);
    memset((char *) &client_sin, 0, sizeof(client_sin));
    client_sin.sg_family = hp->h_addrtype;
    request_set(&request, RQ_CLIENT_SIN, &client_sin, 0);

    for (count = 0; (addr = hp->h_addr_list[count]) != 0; count++) {
	memcpy((char *) SGADDRP(&client_sin), addr, hp->h_length);

	/*
	 * Force evaluation of client host name and address. Host name
	 * conflicts will be reported while eval_hostname() does its job.
	 */
	request_set(&request, RQ_CLIENT_NAME, "", RQ_CLIENT_ADDR, "", 0);
	if (STR_EQ(eval_hostname(request.client), unknown))
	    tcpd_warn("host address %s->name lookup failed",
		      eval_hostaddr(request.client));
	tcpdmatch(&request);
	if (hp->h_addr_list[count + 1])
	    printf("\n");
    }
    free((char *) hp);
    exit(0);
}

/* Explain how to use this program */

static void usage(myname)
char   *myname;
{
    fprintf(stderr, "usage: %s [-d] [-i inet_conf] daemon[@host] [user@]host\n",
	    myname);
    fprintf(stderr, "	-d: use allow/deny files in current directory\n");
    fprintf(stderr, "	-i: location of inetd.conf file\n");
    exit(1);
}

/* Print interesting expansions */

static void expand(text, pattern, request)
char   *text;
char   *pattern;
struct request_info *request;
{
    char    buf[BUFSIZ];

    if (STR_NE(percent_x(buf, sizeof(buf), pattern, request), unknown))
	printf("%s %s\n", text, buf);
}

/* Try out a (server,client) pair */

static void tcpdmatch(request)
struct request_info *request;
{
    int     verdict;

    /*
     * Show what we really know. Suppress uninteresting noise.
     */
    expand("client:   hostname", "%n", request);
    expand("client:   address ", "%a", request);
    expand("client:   username", "%u", request);
    expand("server:   hostname", "%N", request);
    expand("server:   address ", "%A", request);
    expand("server:   process ", "%d", request);

    /*
     * Reset stuff that might be changed by options handlers. In dry-run
     * mode, extension language routines that would not return should inform
     * us of their plan, by clearing the dry_run flag. This is a bit clumsy
     * but we must be able to verify hosts with more than one network
     * address.
     */
    rfc931_timeout = RFC931_TIMEOUT;
    allow_severity = SEVERITY;
    deny_severity = LOG_WARNING;
    dry_run = 1;

    /*
     * When paranoid mode is enabled, access is rejected no matter what the
     * access control rules say.
     */
#ifdef PARANOID
    if (STR_EQ(eval_hostname(request->client), paranoid)) {
	printf("access:   denied (PARANOID mode)\n\n");
	return;
    }
#endif

    /*
     * Report the access control verdict.
     */
    verdict = hosts_access(request);
    printf("access:   %s\n",
	   dry_run == 0 ? "delegated" :
	   verdict ? "granted" : "denied");
}
 /*
  * This program can be called via a remote shell command to find out if the
  * hostname and address are properly recognized, if username lookup works,
  * and (SysV only) if the TLI on top of IP heuristics work.
  *
  * Example: "rsh host /some/where/try-from".
  *
  * Diagnostics are reported through syslog(3) and redirected to stderr.
  *
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  */

#ifndef lint
static char sccsid[] = "@(#) try-from.c 1.2 94/12/28 17:42:55";
#endif

/* System libraries. */

#include <sys/types.h>
#include <stdio.h>
#include <syslog.h>
#include <string.h>

#ifdef TLI
#include <sys/tiuser.h>
#include <stropts.h>
#endif

#ifndef STDIN_FILENO
#define	STDIN_FILENO	0
#endif

/* Local stuff. */

#include "tcpd.h"

int     allow_severity = SEVERITY;	/* run-time adjustable */
int     deny_severity = LOG_WARNING;	/* ditto */

int
main(argc, argv)
int     argc;
char  **argv;
{
    struct request_info request;
    char    buf[BUFSIZ];
    char   *cp;

    /*
     * Simplify the process name, just like tcpd would.
     */
    if ((cp = strrchr(argv[0], '/')) != 0)
	argv[0] = cp + 1;

    /*
     * Turn on the "IP-underneath-TLI" detection heuristics.
     */
#ifdef TLI
    if (ioctl(0, I_FIND, "timod") == 0)
	ioctl(0, I_PUSH, "timod");
#endif /* TLI */

    /*
     * Look up the endpoint information.
     */
    request_init(&request, RQ_DAEMON, argv[0], RQ_FILE, STDIN_FILENO, 0);
    (void) fromhost(&request);

    /*
     * Show some results. Name and address information is looked up when we
     * ask for it.
     */

#define EXPAND(str) percent_x(buf, sizeof(buf), str, &request)

    puts(EXPAND("client address  (%%a): %a"));
    puts(EXPAND("client hostname (%%n): %n"));
    puts(EXPAND("client username (%%u): %u"));
    puts(EXPAND("client info     (%%c): %c"));
    puts(EXPAND("server address  (%%A): %A"));
    puts(EXPAND("server hostname (%%N): %N"));
    puts(EXPAND("server process  (%%d): %d"));
    puts(EXPAND("server info     (%%s): %s"));

    return (0);
}