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128 lines
5.4 KiB
Text
128 lines
5.4 KiB
Text
/* $Slackware: inetd.c 1.79s 2001/02/06 13:18:00 volkerdi Exp $ */
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/* $OpenBSD: inetd.c,v 1.79 2001/01/30 08:30:57 deraadt Exp $ */
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/* $NetBSD: inetd.c,v 1.11 1996/02/22 11:14:41 mycroft Exp $ */
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/*
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* Copyright (c) 1983,1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Inetd - Internet super-server
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*
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* This program invokes all internet services as needed.
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* connection-oriented services are invoked each time a
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* connection is made, by creating a process. This process
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* is passed the connection as file descriptor 0 and is
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* expected to do a getpeername to find out the source host
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* and port.
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*
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* Datagram oriented services are invoked when a datagram
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* arrives; a process is created and passed a pending message
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* on file descriptor 0. Datagram servers may either connect
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* to their peer, freeing up the original socket for inetd
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* to receive further messages on, or ``take over the socket'',
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* processing all arriving datagrams and, eventually, timing
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* out. The first type of server is said to be ``multi-threaded'';
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* the second type of server ``single-threaded''.
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*
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* Inetd uses a configuration file which is read at startup
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* and, possibly, at some later time in response to a hangup signal.
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* The configuration file is ``free format'' with fields given in the
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* order shown below. Continuation lines for an entry must begin with
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* a space or tab. All fields must be present in each entry.
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*
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* service name must be in /etc/services
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* socket type stream/dgram/raw/rdm/seqpacket
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* protocol must be in /etc/protocols
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* wait/nowait[.max] single-threaded/multi-threaded, max #
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* user[.group] or user[:group] user/group to run daemon as
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* server program full path name
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* server program arguments maximum of MAXARGS (20)
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*
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* For RPC services
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* service name/version must be in /etc/rpc
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* socket type stream/dgram/raw/rdm/seqpacket
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* protocol must be in /etc/protocols
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* wait/nowait[.max] single-threaded/multi-threaded
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* user[.group] or user[:group] user to run daemon as
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* server program full path name
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* server program arguments maximum of MAXARGS (20)
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*
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* For non-RPC services, the "service name" can be of the form
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* hostaddress:servicename, in which case the hostaddress is used
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* as the host portion of the address to listen on. If hostaddress
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* consists of a single `*' character, INADDR_ANY is used.
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*
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* A line can also consist of just
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* hostaddress:
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* where hostaddress is as in the preceding paragraph. Such a line must
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* have no further fields; the specified hostaddress is remembered and
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* used for all further lines that have no hostaddress specified,
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* until the next such line (or EOF). (This is why * is provided to
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* allow explicit specification of INADDR_ANY.) A line
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* *:
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* is implicitly in effect at the beginning of the file.
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*
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* The hostaddress specifier may (and often will) contain dots;
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* the service name must not.
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*
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* For RPC services, host-address specifiers are accepted and will
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* work to some extent; however, because of limitations in the
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* portmapper interface, it will not work to try to give more than
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* one line for any given RPC service, even if the host-address
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* specifiers are different.
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*
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* Comment lines are indicated by a `#' in column 1.
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*/
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/*
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* Here's the scoop concerning the user[.:]group feature:
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*
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* 1) set-group-option off.
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*
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* a) user = root: NO setuid() or setgid() is done
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*
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* b) other: setgid(primary group as found in passwd)
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* initgroups(name, primary group)
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* setuid()
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*
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* 2) set-group-option on.
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*
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* a) user = root: setgid(specified group)
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* NO initgroups()
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* NO setuid()
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*
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* b) other: setgid(specified group)
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* initgroups(name, specified group)
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* setuid()
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*
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*/
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