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1783 lines
46 KiB
C
1783 lines
46 KiB
C
/* vi: set sw=4 ts=4: */
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/* $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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/* Busybox port by Vladimir Oleynik (C) 2001-2005 <dzo@simtreas.ru> */
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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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/* 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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/* inetd rules for passing file descriptors to children
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* (http://www.freebsd.org/cgi/man.cgi?query=inetd):
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*
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* The wait/nowait entry specifies whether the server that is invoked by
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* inetd will take over the socket associated with the service access point,
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* and thus whether inetd should wait for the server to exit before listen-
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* ing for new service requests. Datagram servers must use "wait", as
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* they are always invoked with the original datagram socket bound to the
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* specified service address. These servers must read at least one datagram
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* from the socket before exiting. If a datagram server connects to its
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* peer, freeing the socket so inetd can receive further messages on the
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* socket, it is said to be a "multi-threaded" server; it should read one
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* datagram from the socket and create a new socket connected to the peer.
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* It should fork, and the parent should then exit to allow inetd to check
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* for new service requests to spawn new servers. Datagram servers which
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* process all incoming datagrams on a socket and eventually time out are
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* said to be "single-threaded". The comsat(8), (biff(1)) and talkd(8)
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* utilities are both examples of the latter type of datagram server. The
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* tftpd(8) utility is an example of a multi-threaded datagram server.
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*
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* Servers using stream sockets generally are multi-threaded and use the
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* "nowait" entry. Connection requests for these services are accepted by
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* inetd, and the server is given only the newly-accepted socket connected
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* to a client of the service. Most stream-based services operate in this
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* manner. Stream-based servers that use "wait" are started with the lis-
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* tening service socket, and must accept at least one connection request
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* before exiting. Such a server would normally accept and process incoming
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* connection requests until a timeout.
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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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#include "busybox.h"
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#include <syslog.h>
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#include <sys/un.h>
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//#define ENABLE_FEATURE_INETD_RPC 1
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//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO 1
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//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD 1
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//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME 1
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//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME 1
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//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN 1
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//#define ENABLE_FEATURE_IPV6 1
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#if ENABLE_FEATURE_INETD_RPC
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#include <rpc/rpc.h>
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#include <rpc/pmap_clnt.h>
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#endif
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extern char **environ;
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#define _PATH_INETDPID "/var/run/inetd.pid"
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#define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
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#define RETRYTIME (60*10) /* retry after bind or server fail */
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#ifndef RLIMIT_NOFILE
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#define RLIMIT_NOFILE RLIMIT_OFILE
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#endif
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#ifndef OPEN_MAX
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#define OPEN_MAX 64
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#endif
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/* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
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#define FD_MARGIN 8
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static rlim_t rlim_ofile_cur = OPEN_MAX;
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static struct rlimit rlim_ofile;
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/* Check unsupporting builtin */
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
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ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
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ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME || \
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ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME || \
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ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
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# define INETD_FEATURE_ENABLED
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
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ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
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ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
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# define INETD_SETPROCTITLE
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#endif
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typedef struct servtab {
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char *se_hostaddr; /* host address to listen on */
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char *se_service; /* name of service */
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int se_socktype; /* type of socket to use */
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int se_family; /* address family */
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char *se_proto; /* protocol used */
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#if ENABLE_FEATURE_INETD_RPC
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int se_rpcprog; /* rpc program number */
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int se_rpcversl; /* rpc program lowest version */
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int se_rpcversh; /* rpc program highest version */
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#define isrpcservice(sep) ((sep)->se_rpcversl != 0)
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#else
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#define isrpcservice(sep) 0
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#endif
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pid_t se_wait; /* single threaded server */
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short se_checked; /* looked at during merge */
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char *se_user; /* user name to run as */
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char *se_group; /* group name to run as */
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#ifdef INETD_FEATURE_ENABLED
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const struct builtin *se_bi; /* if built-in, description */
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#endif
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char *se_server; /* server program */
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#define MAXARGV 20
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char *se_argv[MAXARGV + 1]; /* program arguments */
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int se_fd; /* open descriptor */
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union {
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struct sockaddr se_un_ctrladdr;
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struct sockaddr_in se_un_ctrladdr_in;
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#if ENABLE_FEATURE_IPV6
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struct sockaddr_in6 se_un_ctrladdr_in6;
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#endif
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struct sockaddr_un se_un_ctrladdr_un;
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} se_un; /* bound address */
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#define se_ctrladdr se_un.se_un_ctrladdr
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#define se_ctrladdr_in se_un.se_un_ctrladdr_in
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#define se_ctrladdr_in6 se_un.se_un_ctrladdr_in6
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#define se_ctrladdr_un se_un.se_un_ctrladdr_un
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int se_ctrladdr_size;
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int se_max; /* max # of instances of this service */
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int se_count; /* number started since se_time */
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struct timeval se_time; /* start of se_count */
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struct servtab *se_next;
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} servtab_t;
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static servtab_t *servtab;
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#ifdef INETD_FEATURE_ENABLED
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struct builtin {
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const char *bi_service; /* internally provided service name */
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int bi_socktype; /* type of socket supported */
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short bi_fork; /* 1 if should fork before call */
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short bi_wait; /* 1 if should wait for child */
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void (*bi_fn) (int, servtab_t *);
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};
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/* Echo received data */
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
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static void echo_stream(int, servtab_t *);
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static void echo_dg(int, servtab_t *);
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#endif
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/* Internet /dev/null */
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
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static void discard_stream(int, servtab_t *);
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static void discard_dg(int, servtab_t *);
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#endif
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/* Return 32 bit time since 1900 */
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
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static void machtime_stream(int, servtab_t *);
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static void machtime_dg(int, servtab_t *);
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#endif
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/* Return human-readable time */
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
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static void daytime_stream(int, servtab_t *);
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static void daytime_dg(int, servtab_t *);
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#endif
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/* Familiar character generator */
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
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static void chargen_stream(int, servtab_t *);
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static void chargen_dg(int, servtab_t *);
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#endif
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static const struct builtin builtins[] = {
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
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/* Echo received data */
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{"echo", SOCK_STREAM, 1, 0, echo_stream,},
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{"echo", SOCK_DGRAM, 0, 0, echo_dg,},
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
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/* Internet /dev/null */
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{"discard", SOCK_STREAM, 1, 0, discard_stream,},
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{"discard", SOCK_DGRAM, 0, 0, discard_dg,},
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
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/* Return 32 bit time since 1900 */
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{"time", SOCK_STREAM, 0, 0, machtime_stream,},
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{"time", SOCK_DGRAM, 0, 0, machtime_dg,},
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
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/* Return human-readable time */
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{"daytime", SOCK_STREAM, 0, 0, daytime_stream,},
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{"daytime", SOCK_DGRAM, 0, 0, daytime_dg,},
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
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/* Familiar character generator */
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{"chargen", SOCK_STREAM, 1, 0, chargen_stream,},
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{"chargen", SOCK_DGRAM, 0, 0, chargen_dg,},
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#endif
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{NULL, 0, 0, 0, NULL}
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};
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#endif /* INETD_FEATURE_ENABLED */
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static int global_queuelen = 128;
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static int nsock, maxsock;
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static fd_set allsock;
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static int toomany;
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static int timingout;
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static struct servent *sp;
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static uid_t uid;
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static const char *config_filename = "/etc/inetd.conf";
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static FILE *fconfig;
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static char *defhost;
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/* xstrdup(NULL) returns NULL, but this one
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* will return newly-allocated "" if called with NULL arg
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* TODO: audit whether this makes any real difference
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*/
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static char *xxstrdup(char *cp)
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{
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return xstrdup(cp ? cp : "");
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}
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static int setconfig(void)
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{
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free(defhost);
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defhost = xstrdup("*");
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if (fconfig != NULL) {
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fseek(fconfig, 0L, SEEK_SET);
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return 1;
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}
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fconfig = fopen(config_filename, "r");
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return (fconfig != NULL);
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}
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static void endconfig(void)
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{
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if (fconfig) {
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(void) fclose(fconfig);
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fconfig = NULL;
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}
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free(defhost);
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defhost = 0;
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}
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#if ENABLE_FEATURE_INETD_RPC
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static void register_rpc(servtab_t *sep)
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{
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int n;
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struct sockaddr_in ir_sin;
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struct protoent *pp;
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socklen_t size;
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if ((pp = getprotobyname(sep->se_proto + 4)) == NULL) {
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bb_perror_msg("%s: getproto", sep->se_proto);
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return;
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}
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size = sizeof ir_sin;
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if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
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bb_perror_msg("%s/%s: getsockname",
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sep->se_service, sep->se_proto);
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return;
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}
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for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
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(void) pmap_unset(sep->se_rpcprog, n);
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if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(ir_sin.sin_port)))
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bb_perror_msg("%s %s: pmap_set: %u %u %u %u",
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sep->se_service, sep->se_proto,
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sep->se_rpcprog, n, pp->p_proto, ntohs(ir_sin.sin_port));
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}
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}
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static void unregister_rpc(servtab_t *sep)
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{
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int n;
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for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
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if (!pmap_unset(sep->se_rpcprog, n))
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bb_error_msg("pmap_unset(%u, %u)", sep->se_rpcprog, n);
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}
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}
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#endif /* FEATURE_INETD_RPC */
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static void freeconfig(servtab_t *cp)
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{
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int i;
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free(cp->se_hostaddr);
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free(cp->se_service);
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free(cp->se_proto);
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free(cp->se_user);
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free(cp->se_group);
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free(cp->se_server);
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for (i = 0; i < MAXARGV; i++)
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free(cp->se_argv[i]);
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}
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static int bump_nofile(void)
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{
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#define FD_CHUNK 32
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struct rlimit rl;
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if (getrlimit(RLIMIT_NOFILE, &rl) < 0) {
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bb_perror_msg("getrlimit");
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return -1;
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}
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rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK);
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rl.rlim_cur = MIN(FD_SETSIZE, rl.rlim_cur + FD_CHUNK);
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if (rl.rlim_cur <= rlim_ofile_cur) {
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bb_error_msg("bump_nofile: cannot extend file limit, max = %d",
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(int) rl.rlim_cur);
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return -1;
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}
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if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
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bb_perror_msg("setrlimit");
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return -1;
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}
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rlim_ofile_cur = rl.rlim_cur;
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return 0;
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}
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static void setup(servtab_t *sep)
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{
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int r;
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sep->se_fd = socket(sep->se_family, sep->se_socktype, 0);
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if (sep->se_fd < 0) {
|
|
bb_perror_msg("%s/%s: socket", sep->se_service, sep->se_proto);
|
|
return;
|
|
}
|
|
if (setsockopt_reuseaddr(sep->se_fd) < 0)
|
|
bb_perror_msg("setsockopt(SO_REUSEADDR)");
|
|
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
if (isrpcservice(sep)) {
|
|
struct passwd *pwd;
|
|
|
|
/*
|
|
* for RPC services, attempt to use a reserved port
|
|
* if they are going to be running as root.
|
|
*
|
|
* Also, zero out the port for all RPC services; let bind()
|
|
* find one.
|
|
*/
|
|
sep->se_ctrladdr_in.sin_port = 0;
|
|
if (sep->se_user && (pwd = getpwnam(sep->se_user)) &&
|
|
pwd->pw_uid == 0 && uid == 0)
|
|
r = bindresvport(sep->se_fd, &sep->se_ctrladdr_in);
|
|
else {
|
|
r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size);
|
|
if (r == 0) {
|
|
socklen_t len = sep->se_ctrladdr_size;
|
|
int saveerrno = errno;
|
|
|
|
/* update se_ctrladdr_in.sin_port */
|
|
r = getsockname(sep->se_fd, &sep->se_ctrladdr, &len);
|
|
if (r <= 0)
|
|
errno = saveerrno;
|
|
}
|
|
}
|
|
} else
|
|
#endif
|
|
r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size);
|
|
if (r < 0) {
|
|
bb_perror_msg("%s/%s (%d): bind",
|
|
sep->se_service, sep->se_proto, sep->se_ctrladdr.sa_family);
|
|
close(sep->se_fd);
|
|
sep->se_fd = -1;
|
|
if (!timingout) {
|
|
timingout = 1;
|
|
alarm(RETRYTIME);
|
|
}
|
|
return;
|
|
}
|
|
if (sep->se_socktype == SOCK_STREAM)
|
|
listen(sep->se_fd, global_queuelen);
|
|
|
|
FD_SET(sep->se_fd, &allsock);
|
|
nsock++;
|
|
if (sep->se_fd > maxsock) {
|
|
maxsock = sep->se_fd;
|
|
if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
|
|
bump_nofile();
|
|
}
|
|
}
|
|
|
|
static char *nextline(void)
|
|
{
|
|
#define line bb_common_bufsiz1
|
|
|
|
char *cp;
|
|
FILE *fd = fconfig;
|
|
|
|
if (fgets(line, sizeof(line), fd) == NULL)
|
|
return NULL;
|
|
cp = strchr(line, '\n');
|
|
if (cp)
|
|
*cp = '\0';
|
|
return line;
|
|
}
|
|
|
|
static char *skip(char **cpp) /* int report; */
|
|
{
|
|
char *cp = *cpp;
|
|
char *start;
|
|
|
|
/* erp: */
|
|
if (*cpp == NULL) {
|
|
/* if (report) */
|
|
/* bb_error_msg("syntax error in inetd config file"); */
|
|
return NULL;
|
|
}
|
|
|
|
again:
|
|
while (*cp == ' ' || *cp == '\t')
|
|
cp++;
|
|
if (*cp == '\0') {
|
|
int c;
|
|
|
|
c = getc(fconfig);
|
|
ungetc(c, fconfig);
|
|
if (c == ' ' || c == '\t') {
|
|
cp = nextline();
|
|
if (cp)
|
|
goto again;
|
|
}
|
|
*cpp = NULL;
|
|
/* goto erp; */
|
|
return NULL;
|
|
}
|
|
start = cp;
|
|
while (*cp && *cp != ' ' && *cp != '\t')
|
|
cp++;
|
|
if (*cp != '\0')
|
|
*cp++ = '\0';
|
|
/* if ((*cpp = cp) == NULL) */
|
|
/* goto erp; */
|
|
|
|
*cpp = cp;
|
|
return start;
|
|
}
|
|
|
|
static servtab_t *new_servtab(void)
|
|
{
|
|
return xmalloc(sizeof(servtab_t));
|
|
}
|
|
|
|
static servtab_t *dupconfig(servtab_t *sep)
|
|
{
|
|
servtab_t *newtab;
|
|
int argc;
|
|
|
|
newtab = new_servtab();
|
|
memset(newtab, 0, sizeof(servtab_t));
|
|
newtab->se_service = xstrdup(sep->se_service);
|
|
newtab->se_socktype = sep->se_socktype;
|
|
newtab->se_family = sep->se_family;
|
|
newtab->se_proto = xstrdup(sep->se_proto);
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
newtab->se_rpcprog = sep->se_rpcprog;
|
|
newtab->se_rpcversl = sep->se_rpcversl;
|
|
newtab->se_rpcversh = sep->se_rpcversh;
|
|
#endif
|
|
newtab->se_wait = sep->se_wait;
|
|
newtab->se_user = xstrdup(sep->se_user);
|
|
newtab->se_group = xstrdup(sep->se_group);
|
|
#ifdef INETD_FEATURE_ENABLED
|
|
newtab->se_bi = sep->se_bi;
|
|
#endif
|
|
newtab->se_server = xstrdup(sep->se_server);
|
|
|
|
for (argc = 0; argc <= MAXARGV; argc++)
|
|
newtab->se_argv[argc] = xstrdup(sep->se_argv[argc]);
|
|
newtab->se_max = sep->se_max;
|
|
|
|
return newtab;
|
|
}
|
|
|
|
static servtab_t *getconfigent(void)
|
|
{
|
|
servtab_t *sep;
|
|
int argc;
|
|
char *cp, *arg;
|
|
char *hostdelim;
|
|
servtab_t *nsep;
|
|
servtab_t *psep;
|
|
|
|
sep = new_servtab();
|
|
|
|
/* memset(sep, 0, sizeof *sep); */
|
|
more:
|
|
/* freeconfig(sep); */
|
|
|
|
while ((cp = nextline()) && *cp == '#') /* skip comment line */;
|
|
if (cp == NULL) {
|
|
/* free(sep); */
|
|
return NULL;
|
|
}
|
|
|
|
memset((char *) sep, 0, sizeof *sep);
|
|
arg = skip(&cp);
|
|
if (arg == NULL) {
|
|
/* A blank line. */
|
|
goto more;
|
|
}
|
|
|
|
/* Check for a host name. */
|
|
hostdelim = strrchr(arg, ':');
|
|
if (hostdelim) {
|
|
*hostdelim = '\0';
|
|
sep->se_hostaddr = xstrdup(arg);
|
|
arg = hostdelim + 1;
|
|
/*
|
|
* If the line is of the form `host:', then just change the
|
|
* default host for the following lines.
|
|
*/
|
|
if (*arg == '\0') {
|
|
arg = skip(&cp);
|
|
if (cp == NULL) {
|
|
free(defhost);
|
|
defhost = sep->se_hostaddr;
|
|
goto more;
|
|
}
|
|
}
|
|
} else
|
|
sep->se_hostaddr = xxstrdup(defhost);
|
|
|
|
sep->se_service = xxstrdup(arg);
|
|
arg = skip(&cp);
|
|
|
|
if (strcmp(arg, "stream") == 0)
|
|
sep->se_socktype = SOCK_STREAM;
|
|
else if (strcmp(arg, "dgram") == 0)
|
|
sep->se_socktype = SOCK_DGRAM;
|
|
else if (strcmp(arg, "rdm") == 0)
|
|
sep->se_socktype = SOCK_RDM;
|
|
else if (strcmp(arg, "seqpacket") == 0)
|
|
sep->se_socktype = SOCK_SEQPACKET;
|
|
else if (strcmp(arg, "raw") == 0)
|
|
sep->se_socktype = SOCK_RAW;
|
|
else
|
|
sep->se_socktype = -1;
|
|
|
|
sep->se_proto = xxstrdup(skip(&cp));
|
|
|
|
if (strcmp(sep->se_proto, "unix") == 0) {
|
|
sep->se_family = AF_UNIX;
|
|
} else {
|
|
sep->se_family = AF_INET;
|
|
if (sep->se_proto[strlen(sep->se_proto) - 1] == '6')
|
|
#if ENABLE_FEATURE_IPV6
|
|
sep->se_family = AF_INET6;
|
|
#else
|
|
bb_error_msg("%s: IPV6 not supported", sep->se_proto);
|
|
#endif
|
|
if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
char *p, *ccp;
|
|
long l;
|
|
|
|
p = strchr(sep->se_service, '/');
|
|
if (p == 0) {
|
|
bb_error_msg("%s: no rpc version", sep->se_service);
|
|
goto more;
|
|
}
|
|
*p++ = '\0';
|
|
l = strtol(p, &ccp, 0);
|
|
if (ccp == p || l < 0 || l > INT_MAX) {
|
|
badafterall:
|
|
bb_error_msg("%s/%s: bad rpc version", sep->se_service, p);
|
|
goto more;
|
|
}
|
|
sep->se_rpcversl = sep->se_rpcversh = l;
|
|
if (*ccp == '-') {
|
|
p = ccp + 1;
|
|
l = strtol(p, &ccp, 0);
|
|
if (ccp == p || l < 0 || l > INT_MAX || l < sep->se_rpcversl || *ccp)
|
|
goto badafterall;
|
|
sep->se_rpcversh = l;
|
|
} else if (*ccp != '\0')
|
|
goto badafterall;
|
|
#else
|
|
bb_error_msg("%s: rpc services not supported", sep->se_service);
|
|
#endif
|
|
}
|
|
}
|
|
arg = skip(&cp);
|
|
if (arg == NULL)
|
|
goto more;
|
|
|
|
{
|
|
char *s = strchr(arg, '.');
|
|
if (s) {
|
|
*s++ = '\0';
|
|
sep->se_max = xatoi(s);
|
|
} else
|
|
sep->se_max = toomany;
|
|
}
|
|
sep->se_wait = strcmp(arg, "wait") == 0;
|
|
/* if ((arg = skip(&cp, 1)) == NULL) */
|
|
/* goto more; */
|
|
sep->se_user = xxstrdup(skip(&cp));
|
|
arg = strchr(sep->se_user, '.');
|
|
if (arg == NULL)
|
|
arg = strchr(sep->se_user, ':');
|
|
if (arg) {
|
|
*arg++ = '\0';
|
|
sep->se_group = xstrdup(arg);
|
|
}
|
|
/* if ((arg = skip(&cp, 1)) == NULL) */
|
|
/* goto more; */
|
|
|
|
sep->se_server = xxstrdup(skip(&cp));
|
|
if (strcmp(sep->se_server, "internal") == 0) {
|
|
#ifdef INETD_FEATURE_ENABLED
|
|
const struct builtin *bi;
|
|
|
|
for (bi = builtins; bi->bi_service; bi++)
|
|
if (bi->bi_socktype == sep->se_socktype &&
|
|
strcmp(bi->bi_service, sep->se_service) == 0)
|
|
break;
|
|
if (bi->bi_service == 0) {
|
|
bb_error_msg("internal service %s unknown", sep->se_service);
|
|
goto more;
|
|
}
|
|
sep->se_bi = bi;
|
|
sep->se_wait = bi->bi_wait;
|
|
#else
|
|
bb_perror_msg("internal service %s unknown", sep->se_service);
|
|
goto more;
|
|
#endif
|
|
}
|
|
#ifdef INETD_FEATURE_ENABLED
|
|
else
|
|
sep->se_bi = NULL;
|
|
#endif
|
|
argc = 0;
|
|
for (arg = skip(&cp); cp; arg = skip(&cp)) {
|
|
if (argc < MAXARGV)
|
|
sep->se_argv[argc++] = xxstrdup(arg);
|
|
}
|
|
while (argc <= MAXARGV)
|
|
sep->se_argv[argc++] = NULL;
|
|
|
|
/*
|
|
* Now that we've processed the entire line, check if the hostname
|
|
* specifier was a comma separated list of hostnames. If so
|
|
* we'll make new entries for each address.
|
|
*/
|
|
while ((hostdelim = strrchr(sep->se_hostaddr, ',')) != NULL) {
|
|
nsep = dupconfig(sep);
|
|
|
|
/*
|
|
* NULL terminate the hostname field of the existing entry,
|
|
* and make a dup for the new entry.
|
|
*/
|
|
*hostdelim++ = '\0';
|
|
nsep->se_hostaddr = xstrdup(hostdelim);
|
|
|
|
nsep->se_next = sep->se_next;
|
|
sep->se_next = nsep;
|
|
}
|
|
|
|
nsep = sep;
|
|
while (nsep != NULL) {
|
|
nsep->se_checked = 1;
|
|
if (nsep->se_family == AF_INET) {
|
|
if (LONE_CHAR(nsep->se_hostaddr, '*'))
|
|
nsep->se_ctrladdr_in.sin_addr.s_addr = INADDR_ANY;
|
|
else if (!inet_aton(nsep->se_hostaddr, &nsep->se_ctrladdr_in.sin_addr)) {
|
|
struct hostent *hp;
|
|
|
|
hp = gethostbyname(nsep->se_hostaddr);
|
|
if (hp == 0) {
|
|
bb_error_msg("%s: unknown host", nsep->se_hostaddr);
|
|
nsep->se_checked = 0;
|
|
goto skip;
|
|
} else if (hp->h_addrtype != AF_INET) {
|
|
bb_error_msg("%s: address isn't an Internet "
|
|
"address", nsep->se_hostaddr);
|
|
nsep->se_checked = 0;
|
|
goto skip;
|
|
} else {
|
|
int i = 1;
|
|
|
|
memmove(&nsep->se_ctrladdr_in.sin_addr,
|
|
hp->h_addr_list[0], sizeof(struct in_addr));
|
|
while (hp->h_addr_list[i] != NULL) {
|
|
psep = dupconfig(nsep);
|
|
psep->se_hostaddr = xxstrdup(nsep->se_hostaddr);
|
|
psep->se_checked = 1;
|
|
memmove(&psep->se_ctrladdr_in.sin_addr,
|
|
hp->h_addr_list[i], sizeof(struct in_addr));
|
|
psep->se_ctrladdr_size = sizeof(psep->se_ctrladdr_in);
|
|
i++;
|
|
/* Prepend to list, don't want to look up */
|
|
/* its hostname again. */
|
|
psep->se_next = sep;
|
|
sep = psep;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/* XXX BUG?: is this skip: label supposed to remain? */
|
|
skip:
|
|
nsep = nsep->se_next;
|
|
}
|
|
|
|
/*
|
|
* Finally, free any entries which failed the gethostbyname
|
|
* check.
|
|
*/
|
|
psep = NULL;
|
|
nsep = sep;
|
|
while (nsep != NULL) {
|
|
servtab_t *tsep;
|
|
|
|
if (nsep->se_checked == 0) {
|
|
tsep = nsep;
|
|
if (psep == NULL) {
|
|
sep = nsep->se_next;
|
|
nsep = sep;
|
|
} else {
|
|
nsep = nsep->se_next;
|
|
psep->se_next = nsep;
|
|
}
|
|
freeconfig(tsep);
|
|
} else {
|
|
nsep->se_checked = 0;
|
|
psep = nsep;
|
|
nsep = nsep->se_next;
|
|
}
|
|
}
|
|
|
|
return sep;
|
|
}
|
|
|
|
#define Block_Using_Signals(m) do { \
|
|
sigemptyset(&m); \
|
|
sigaddset(&m, SIGCHLD); \
|
|
sigaddset(&m, SIGHUP); \
|
|
sigaddset(&m, SIGALRM); \
|
|
sigprocmask(SIG_BLOCK, &m, NULL); \
|
|
} while (0)
|
|
|
|
static servtab_t *enter(servtab_t *cp)
|
|
{
|
|
servtab_t *sep;
|
|
sigset_t omask;
|
|
|
|
sep = new_servtab();
|
|
*sep = *cp;
|
|
sep->se_fd = -1;
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
sep->se_rpcprog = -1;
|
|
#endif
|
|
Block_Using_Signals(omask);
|
|
sep->se_next = servtab;
|
|
servtab = sep;
|
|
sigprocmask(SIG_UNBLOCK, &omask, NULL);
|
|
return sep;
|
|
}
|
|
|
|
static int matchconf(servtab_t *old, servtab_t *new)
|
|
{
|
|
if (strcmp(old->se_service, new->se_service) != 0)
|
|
return 0;
|
|
|
|
if (strcmp(old->se_hostaddr, new->se_hostaddr) != 0)
|
|
return 0;
|
|
|
|
if (strcmp(old->se_proto, new->se_proto) != 0)
|
|
return 0;
|
|
|
|
/*
|
|
* If the new servtab is bound to a specific address, check that the
|
|
* old servtab is bound to the same entry. If the new service is not
|
|
* bound to a specific address then the check of se_hostaddr above
|
|
* is sufficient.
|
|
*/
|
|
|
|
if (old->se_family == AF_INET && new->se_family == AF_INET &&
|
|
memcmp(&old->se_ctrladdr_in.sin_addr,
|
|
&new->se_ctrladdr_in.sin_addr,
|
|
sizeof(new->se_ctrladdr_in.sin_addr)) != 0)
|
|
return 0;
|
|
|
|
#if ENABLE_FEATURE_IPV6
|
|
if (old->se_family == AF_INET6 && new->se_family == AF_INET6 &&
|
|
memcmp(&old->se_ctrladdr_in6.sin6_addr,
|
|
&new->se_ctrladdr_in6.sin6_addr,
|
|
sizeof(new->se_ctrladdr_in6.sin6_addr)) != 0)
|
|
return 0;
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
static void config(int sig ATTRIBUTE_UNUSED)
|
|
{
|
|
servtab_t *sep, *cp, **sepp;
|
|
sigset_t omask;
|
|
size_t n;
|
|
char protoname[10];
|
|
|
|
if (!setconfig()) {
|
|
bb_perror_msg("%s", config_filename);
|
|
return;
|
|
}
|
|
for (sep = servtab; sep; sep = sep->se_next)
|
|
sep->se_checked = 0;
|
|
cp = getconfigent();
|
|
while (cp != NULL) {
|
|
for (sep = servtab; sep; sep = sep->se_next)
|
|
if (matchconf(sep, cp))
|
|
break;
|
|
|
|
if (sep != 0) {
|
|
int i;
|
|
|
|
#define SWAP(type, a, b) do {type c=(type)a; a=(type)b; b=(type)c;} while (0)
|
|
|
|
Block_Using_Signals(omask);
|
|
/*
|
|
* sep->se_wait may be holding the pid of a daemon
|
|
* that we're waiting for. If so, don't overwrite
|
|
* it unless the config file explicitly says don't
|
|
* wait.
|
|
*/
|
|
if (
|
|
#ifdef INETD_FEATURE_ENABLED
|
|
cp->se_bi == 0 &&
|
|
#endif
|
|
(sep->se_wait == 1 || cp->se_wait == 0))
|
|
sep->se_wait = cp->se_wait;
|
|
SWAP(int, cp->se_max, sep->se_max);
|
|
SWAP(char *, sep->se_user, cp->se_user);
|
|
SWAP(char *, sep->se_group, cp->se_group);
|
|
SWAP(char *, sep->se_server, cp->se_server);
|
|
for (i = 0; i < MAXARGV; i++)
|
|
SWAP(char *, sep->se_argv[i], cp->se_argv[i]);
|
|
#undef SWAP
|
|
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
if (isrpcservice(sep))
|
|
unregister_rpc(sep);
|
|
sep->se_rpcversl = cp->se_rpcversl;
|
|
sep->se_rpcversh = cp->se_rpcversh;
|
|
#endif
|
|
sigprocmask(SIG_UNBLOCK, &omask, NULL);
|
|
freeconfig(cp);
|
|
} else {
|
|
sep = enter(cp);
|
|
}
|
|
sep->se_checked = 1;
|
|
|
|
switch (sep->se_family) {
|
|
case AF_UNIX:
|
|
if (sep->se_fd != -1)
|
|
break;
|
|
(void) unlink(sep->se_service);
|
|
n = strlen(sep->se_service);
|
|
if (n > sizeof sep->se_ctrladdr_un.sun_path - 1)
|
|
n = sizeof sep->se_ctrladdr_un.sun_path - 1;
|
|
safe_strncpy(sep->se_ctrladdr_un.sun_path, sep->se_service, n + 1);
|
|
sep->se_ctrladdr_un.sun_family = AF_UNIX;
|
|
sep->se_ctrladdr_size = n + sizeof sep->se_ctrladdr_un.sun_family;
|
|
setup(sep);
|
|
break;
|
|
case AF_INET:
|
|
sep->se_ctrladdr_in.sin_family = AF_INET;
|
|
/* se_ctrladdr_in was set in getconfigent */
|
|
sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in;
|
|
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
if (isrpcservice(sep)) {
|
|
struct rpcent *rp;
|
|
// FIXME: atoi_or_else(str, 0) would be handy here
|
|
sep->se_rpcprog = atoi(sep->se_service);
|
|
if (sep->se_rpcprog == 0) {
|
|
rp = getrpcbyname(sep->se_service);
|
|
if (rp == 0) {
|
|
bb_error_msg("%s: unknown rpc service", sep->se_service);
|
|
goto serv_unknown;
|
|
}
|
|
sep->se_rpcprog = rp->r_number;
|
|
}
|
|
if (sep->se_fd == -1)
|
|
setup(sep);
|
|
if (sep->se_fd != -1)
|
|
register_rpc(sep);
|
|
} else
|
|
#endif
|
|
{
|
|
uint16_t port = htons(atoi(sep->se_service));
|
|
// FIXME: atoi_or_else(str, 0) would be handy here
|
|
if (!port) {
|
|
/*XXX*/ strncpy(protoname, sep->se_proto, sizeof(protoname));
|
|
if (isdigit(protoname[strlen(protoname) - 1]))
|
|
protoname[strlen(protoname) - 1] = '\0';
|
|
sp = getservbyname(sep->se_service, protoname);
|
|
if (sp == 0) {
|
|
bb_error_msg("%s/%s: unknown service",
|
|
sep->se_service, sep->se_proto);
|
|
goto serv_unknown;
|
|
}
|
|
port = sp->s_port;
|
|
}
|
|
if (port != sep->se_ctrladdr_in.sin_port) {
|
|
sep->se_ctrladdr_in.sin_port = port;
|
|
if (sep->se_fd != -1) {
|
|
FD_CLR(sep->se_fd, &allsock);
|
|
nsock--;
|
|
(void) close(sep->se_fd);
|
|
}
|
|
sep->se_fd = -1;
|
|
}
|
|
if (sep->se_fd == -1)
|
|
setup(sep);
|
|
}
|
|
break;
|
|
#if ENABLE_FEATURE_IPV6
|
|
case AF_INET6:
|
|
sep->se_ctrladdr_in6.sin6_family = AF_INET6;
|
|
/* se_ctrladdr_in was set in getconfigent */
|
|
sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in6;
|
|
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
if (isrpcservice(sep)) {
|
|
struct rpcent *rp;
|
|
|
|
sep->se_rpcprog = atoi(sep->se_service);
|
|
if (sep->se_rpcprog == 0) {
|
|
rp = getrpcbyname(sep->se_service);
|
|
if (rp == 0) {
|
|
bb_error_msg("%s: unknown rpc service", sep->se_service);
|
|
goto serv_unknown;
|
|
}
|
|
sep->se_rpcprog = rp->r_number;
|
|
}
|
|
if (sep->se_fd == -1)
|
|
setup(sep);
|
|
if (sep->se_fd != -1)
|
|
register_rpc(sep);
|
|
} else
|
|
#endif
|
|
{
|
|
uint16_t port = htons(atoi(sep->se_service));
|
|
|
|
if (!port) {
|
|
/*XXX*/ strncpy(protoname, sep->se_proto, sizeof(protoname));
|
|
if (isdigit(protoname[strlen(protoname) - 1]))
|
|
protoname[strlen(protoname) - 1] = '\0';
|
|
sp = getservbyname(sep->se_service, protoname);
|
|
if (sp == 0) {
|
|
bb_error_msg("%s/%s: unknown service",
|
|
sep->se_service, sep->se_proto);
|
|
goto serv_unknown;
|
|
}
|
|
port = sp->s_port;
|
|
}
|
|
if (port != sep->se_ctrladdr_in6.sin6_port) {
|
|
sep->se_ctrladdr_in6.sin6_port = port;
|
|
if (sep->se_fd != -1) {
|
|
FD_CLR(sep->se_fd, &allsock);
|
|
nsock--;
|
|
(void) close(sep->se_fd);
|
|
}
|
|
sep->se_fd = -1;
|
|
}
|
|
if (sep->se_fd == -1)
|
|
setup(sep);
|
|
}
|
|
break;
|
|
#endif /* FEATURE_IPV6 */
|
|
}
|
|
serv_unknown:
|
|
if (cp->se_next != NULL) {
|
|
servtab_t *tmp = cp;
|
|
|
|
cp = cp->se_next;
|
|
free(tmp);
|
|
} else {
|
|
free(cp);
|
|
cp = getconfigent();
|
|
}
|
|
}
|
|
endconfig();
|
|
/*
|
|
* Purge anything not looked at above.
|
|
*/
|
|
Block_Using_Signals(omask);
|
|
sepp = &servtab;
|
|
while ((sep = *sepp)) {
|
|
if (sep->se_checked) {
|
|
sepp = &sep->se_next;
|
|
continue;
|
|
}
|
|
*sepp = sep->se_next;
|
|
if (sep->se_fd != -1) {
|
|
FD_CLR(sep->se_fd, &allsock);
|
|
nsock--;
|
|
(void) close(sep->se_fd);
|
|
}
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
if (isrpcservice(sep))
|
|
unregister_rpc(sep);
|
|
#endif
|
|
if (sep->se_family == AF_UNIX)
|
|
(void) unlink(sep->se_service);
|
|
freeconfig(sep);
|
|
free(sep);
|
|
}
|
|
sigprocmask(SIG_UNBLOCK, &omask, NULL);
|
|
}
|
|
|
|
|
|
static void reapchild(int sig ATTRIBUTE_UNUSED)
|
|
{
|
|
pid_t pid;
|
|
int save_errno = errno, status;
|
|
servtab_t *sep;
|
|
|
|
for (;;) {
|
|
pid = wait3(&status, WNOHANG, NULL);
|
|
if (pid <= 0)
|
|
break;
|
|
for (sep = servtab; sep; sep = sep->se_next)
|
|
if (sep->se_wait == pid) {
|
|
if (WIFEXITED(status) && WEXITSTATUS(status))
|
|
bb_error_msg("%s: exit status 0x%x",
|
|
sep->se_server, WEXITSTATUS(status));
|
|
else if (WIFSIGNALED(status))
|
|
bb_error_msg("%s: exit signal 0x%x",
|
|
sep->se_server, WTERMSIG(status));
|
|
sep->se_wait = 1;
|
|
FD_SET(sep->se_fd, &allsock);
|
|
nsock++;
|
|
}
|
|
}
|
|
errno = save_errno;
|
|
}
|
|
|
|
static void retry(int sig ATTRIBUTE_UNUSED)
|
|
{
|
|
servtab_t *sep;
|
|
|
|
timingout = 0;
|
|
for (sep = servtab; sep; sep = sep->se_next) {
|
|
if (sep->se_fd == -1) {
|
|
switch (sep->se_family) {
|
|
case AF_UNIX:
|
|
case AF_INET:
|
|
#if ENABLE_FEATURE_IPV6
|
|
case AF_INET6:
|
|
#endif
|
|
setup(sep);
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
if (sep->se_fd != -1 && isrpcservice(sep))
|
|
register_rpc(sep);
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void goaway(int sig ATTRIBUTE_UNUSED)
|
|
{
|
|
servtab_t *sep;
|
|
|
|
/* XXX signal race walking sep list */
|
|
for (sep = servtab; sep; sep = sep->se_next) {
|
|
if (sep->se_fd == -1)
|
|
continue;
|
|
|
|
switch (sep->se_family) {
|
|
case AF_UNIX:
|
|
(void) unlink(sep->se_service);
|
|
break;
|
|
case AF_INET:
|
|
#if ENABLE_FEATURE_IPV6
|
|
case AF_INET6:
|
|
#endif
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
if (sep->se_wait == 1 && isrpcservice(sep))
|
|
unregister_rpc(sep); /* XXX signal race */
|
|
#endif
|
|
break;
|
|
}
|
|
(void) close(sep->se_fd);
|
|
}
|
|
remove_pidfile(_PATH_INETDPID);
|
|
exit(0);
|
|
}
|
|
|
|
|
|
#ifdef INETD_SETPROCTITLE
|
|
static char **Argv;
|
|
static char *LastArg;
|
|
|
|
static void
|
|
inetd_setproctitle(char *a, int s)
|
|
{
|
|
socklen_t size;
|
|
char *cp;
|
|
struct sockaddr_in prt_sin;
|
|
char buf[80];
|
|
|
|
cp = Argv[0];
|
|
size = sizeof(prt_sin);
|
|
(void) snprintf(buf, sizeof buf, "-%s", a);
|
|
if (getpeername(s, (struct sockaddr *) &prt_sin, &size) == 0) {
|
|
char *sa = inet_ntoa(prt_sin.sin_addr);
|
|
|
|
buf[sizeof(buf) - 1 - strlen(sa) - 3] = '\0';
|
|
strcat(buf, " [");
|
|
strcat(buf, sa);
|
|
strcat(buf, "]");
|
|
}
|
|
strncpy(cp, buf, LastArg - cp);
|
|
cp += strlen(cp);
|
|
while (cp < LastArg)
|
|
*cp++ = ' ';
|
|
}
|
|
#endif
|
|
|
|
|
|
int inetd_main(int argc, char **argv);
|
|
int inetd_main(int argc, char **argv)
|
|
{
|
|
servtab_t *sep;
|
|
struct passwd *pwd;
|
|
struct group *grp = NULL;
|
|
int tmpint;
|
|
struct sigaction sa, sapipe;
|
|
int opt;
|
|
pid_t pid;
|
|
char buf[50];
|
|
char *stoomany;
|
|
sigset_t omask, wait_mask;
|
|
|
|
#ifdef INETD_SETPROCTITLE
|
|
char **envp = environ;
|
|
|
|
Argv = argv;
|
|
if (envp == 0 || *envp == 0)
|
|
envp = argv;
|
|
while (*envp)
|
|
envp++;
|
|
LastArg = envp[-1] + strlen(envp[-1]);
|
|
#endif
|
|
|
|
uid = getuid();
|
|
if (uid != 0)
|
|
config_filename = NULL;
|
|
|
|
opt = getopt32(argc, argv, "R:f", &stoomany);
|
|
if (opt & 1)
|
|
toomany = xatoi_u(stoomany);
|
|
argv += optind;
|
|
argc -= optind;
|
|
if (argc)
|
|
config_filename = argv[0];
|
|
if (config_filename == NULL)
|
|
bb_error_msg_and_die("non-root must specify a config file");
|
|
|
|
if (!(opt & 2))
|
|
bb_daemonize_or_rexec(0, argv - optind);
|
|
else
|
|
bb_sanitize_stdio();
|
|
openlog(applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
|
|
logmode = LOGMODE_SYSLOG;
|
|
|
|
if (uid == 0) {
|
|
/* If run by hand, ensure groups vector gets trashed */
|
|
gid_t gid = getgid();
|
|
setgroups(1, &gid);
|
|
}
|
|
|
|
write_pidfile(_PATH_INETDPID);
|
|
|
|
if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) {
|
|
bb_perror_msg("getrlimit");
|
|
} else {
|
|
rlim_ofile_cur = rlim_ofile.rlim_cur;
|
|
if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
|
|
rlim_ofile_cur = OPEN_MAX;
|
|
}
|
|
|
|
memset((char *) &sa, 0, sizeof(sa));
|
|
sigemptyset(&sa.sa_mask);
|
|
sigaddset(&sa.sa_mask, SIGALRM);
|
|
sigaddset(&sa.sa_mask, SIGCHLD);
|
|
sigaddset(&sa.sa_mask, SIGHUP);
|
|
sa.sa_handler = retry;
|
|
sigaction(SIGALRM, &sa, NULL);
|
|
config(SIGHUP);
|
|
sa.sa_handler = config;
|
|
sigaction(SIGHUP, &sa, NULL);
|
|
sa.sa_handler = reapchild;
|
|
sigaction(SIGCHLD, &sa, NULL);
|
|
sa.sa_handler = goaway;
|
|
sigaction(SIGTERM, &sa, NULL);
|
|
sa.sa_handler = goaway;
|
|
sigaction(SIGINT, &sa, NULL);
|
|
sa.sa_handler = SIG_IGN;
|
|
sigaction(SIGPIPE, &sa, &sapipe);
|
|
memset(&wait_mask, 0, sizeof(wait_mask));
|
|
{
|
|
/* space for daemons to overwrite environment for ps */
|
|
#define DUMMYSIZE 100
|
|
char dummy[DUMMYSIZE];
|
|
|
|
(void) memset(dummy, 'x', DUMMYSIZE - 1);
|
|
dummy[DUMMYSIZE - 1] = '\0';
|
|
|
|
(void) setenv("inetd_dummy", dummy, 1);
|
|
}
|
|
|
|
for (;;) {
|
|
int n, ctrl = -1;
|
|
fd_set readable;
|
|
|
|
if (nsock == 0) {
|
|
Block_Using_Signals(omask);
|
|
while (nsock == 0)
|
|
sigsuspend(&wait_mask);
|
|
sigprocmask(SIG_UNBLOCK, &omask, NULL);
|
|
}
|
|
|
|
readable = allsock;
|
|
n = select(maxsock + 1, &readable, NULL, NULL, NULL);
|
|
if (n <= 0) {
|
|
if (n < 0 && errno != EINTR) {
|
|
bb_perror_msg("select");
|
|
sleep(1);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
for (sep = servtab; n && sep; sep = sep->se_next) {
|
|
if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
|
|
continue;
|
|
|
|
n--;
|
|
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) {
|
|
ctrl = accept(sep->se_fd, NULL, NULL);
|
|
if (ctrl < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
bb_perror_msg("accept (for %s)", sep->se_service);
|
|
continue;
|
|
}
|
|
if (sep->se_family == AF_INET && sep->se_socktype == SOCK_STREAM) {
|
|
struct sockaddr_in peer;
|
|
socklen_t plen = sizeof(peer);
|
|
|
|
if (getpeername(ctrl, (struct sockaddr *) &peer, &plen) < 0) {
|
|
bb_error_msg("cannot getpeername");
|
|
close(ctrl);
|
|
continue;
|
|
}
|
|
if (ntohs(peer.sin_port) == 20) {
|
|
/* XXX ftp bounce */
|
|
close(ctrl);
|
|
continue;
|
|
}
|
|
}
|
|
} else
|
|
ctrl = sep->se_fd;
|
|
|
|
Block_Using_Signals(omask);
|
|
pid = 0;
|
|
#ifdef INETD_FEATURE_ENABLED
|
|
if (sep->se_bi == 0 || sep->se_bi->bi_fork)
|
|
#endif
|
|
{
|
|
if (sep->se_count++ == 0)
|
|
(void) gettimeofday(&sep->se_time, NULL);
|
|
else if (toomany > 0 && sep->se_count >= sep->se_max) {
|
|
struct timeval now;
|
|
|
|
(void) gettimeofday(&now, NULL);
|
|
if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) {
|
|
sep->se_time = now;
|
|
sep->se_count = 1;
|
|
} else {
|
|
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
|
|
close(ctrl);
|
|
if (sep->se_family == AF_INET &&
|
|
ntohs(sep->se_ctrladdr_in.sin_port) >= IPPORT_RESERVED) {
|
|
/*
|
|
* Cannot close it -- there are
|
|
* thieves on the system.
|
|
* Simply ignore the connection.
|
|
*/
|
|
--sep->se_count;
|
|
continue;
|
|
}
|
|
bb_error_msg("%s/%s server failing (looping), service terminated",
|
|
sep->se_service, sep->se_proto);
|
|
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
|
|
close(ctrl);
|
|
FD_CLR(sep->se_fd, &allsock);
|
|
(void) close(sep->se_fd);
|
|
sep->se_fd = -1;
|
|
sep->se_count = 0;
|
|
nsock--;
|
|
sigprocmask(SIG_UNBLOCK, &omask, NULL);
|
|
if (!timingout) {
|
|
timingout = 1;
|
|
alarm(RETRYTIME);
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
pid = fork();
|
|
}
|
|
if (pid < 0) {
|
|
bb_perror_msg("fork");
|
|
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
|
|
close(ctrl);
|
|
sigprocmask(SIG_UNBLOCK, &omask, NULL);
|
|
sleep(1);
|
|
continue;
|
|
}
|
|
if (pid && sep->se_wait) {
|
|
sep->se_wait = pid;
|
|
FD_CLR(sep->se_fd, &allsock);
|
|
nsock--;
|
|
}
|
|
sigprocmask(SIG_UNBLOCK, &omask, NULL);
|
|
if (pid == 0) {
|
|
#ifdef INETD_FEATURE_ENABLED
|
|
if (sep->se_bi) {
|
|
(*sep->se_bi->bi_fn)(ctrl, sep);
|
|
} else
|
|
#endif
|
|
{
|
|
pwd = getpwnam(sep->se_user);
|
|
if (pwd == NULL) {
|
|
bb_error_msg("getpwnam: %s: no such user", sep->se_user);
|
|
goto do_exit1;
|
|
}
|
|
if (setsid() < 0)
|
|
bb_perror_msg("%s: setsid", sep->se_service);
|
|
if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
|
|
bb_error_msg("getgrnam: %s: no such group", sep->se_group);
|
|
goto do_exit1;
|
|
}
|
|
if (uid != 0) {
|
|
/* a user running private inetd */
|
|
if (uid != pwd->pw_uid)
|
|
_exit(1);
|
|
} else if (pwd->pw_uid) {
|
|
if (sep->se_group)
|
|
pwd->pw_gid = grp->gr_gid;
|
|
xsetgid((gid_t) pwd->pw_gid);
|
|
initgroups(pwd->pw_name, pwd->pw_gid);
|
|
xsetuid((uid_t) pwd->pw_uid);
|
|
} else if (sep->se_group) {
|
|
xsetgid(grp->gr_gid);
|
|
setgroups(1, &grp->gr_gid);
|
|
}
|
|
dup2(ctrl, 0);
|
|
if (ctrl) close(ctrl);
|
|
dup2(0, 1);
|
|
dup2(0, 2);
|
|
if (rlim_ofile.rlim_cur != rlim_ofile_cur)
|
|
if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
|
|
bb_perror_msg("setrlimit");
|
|
closelog();
|
|
for (tmpint = rlim_ofile_cur - 1; --tmpint > 2;)
|
|
(void) close(tmpint);
|
|
sigaction(SIGPIPE, &sapipe, NULL);
|
|
execv(sep->se_server, sep->se_argv);
|
|
bb_perror_msg("execv %s", sep->se_server);
|
|
do_exit1:
|
|
if (sep->se_socktype != SOCK_STREAM)
|
|
recv(0, buf, sizeof(buf), 0);
|
|
_exit(1);
|
|
}
|
|
}
|
|
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
|
|
close(ctrl);
|
|
} /* for (sep = servtab...) */
|
|
} /* for (;;) */
|
|
}
|
|
|
|
/*
|
|
* Internet services provided internally by inetd:
|
|
*/
|
|
#define BUFSIZE 4096
|
|
|
|
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
|
|
ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN || \
|
|
ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
|
|
static int dg_badinput(struct sockaddr_in *dg_sin)
|
|
{
|
|
if (ntohs(dg_sin->sin_port) < IPPORT_RESERVED)
|
|
return 1;
|
|
if (dg_sin->sin_addr.s_addr == htonl(INADDR_BROADCAST))
|
|
return 1;
|
|
/* XXX compare against broadcast addresses in SIOCGIFCONF list? */
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
|
|
/* Echo service -- echo data back */
|
|
/* ARGSUSED */
|
|
static void
|
|
echo_stream(int s, servtab_t *sep)
|
|
{
|
|
char buffer[BUFSIZE];
|
|
int i;
|
|
|
|
inetd_setproctitle(sep->se_service, s);
|
|
while (1) {
|
|
i = read(s, buffer, sizeof(buffer));
|
|
if (i <= 0) break;
|
|
/* FIXME: this isnt correct - safe_write()? */
|
|
if (write(s, buffer, i) <= 0) break;
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
/* Echo service -- echo data back */
|
|
/* ARGSUSED */
|
|
static void
|
|
echo_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
|
|
{
|
|
char buffer[BUFSIZE];
|
|
int i;
|
|
socklen_t size;
|
|
/* struct sockaddr_storage ss; */
|
|
struct sockaddr sa;
|
|
|
|
size = sizeof(sa);
|
|
i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size);
|
|
if (i < 0)
|
|
return;
|
|
if (dg_badinput((struct sockaddr_in *) &sa))
|
|
return;
|
|
(void) sendto(s, buffer, i, 0, &sa, sizeof(sa));
|
|
}
|
|
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
|
|
|
|
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
|
|
/* Discard service -- ignore data */
|
|
/* ARGSUSED */
|
|
static void
|
|
discard_stream(int s, servtab_t *sep)
|
|
{
|
|
char buffer[BUFSIZE];
|
|
|
|
inetd_setproctitle(sep->se_service, s);
|
|
while (1) {
|
|
errno = 0;
|
|
if (read(s, buffer, sizeof(buffer)) <= 0 && errno != EINTR)
|
|
exit(0);
|
|
}
|
|
}
|
|
|
|
/* Discard service -- ignore data */
|
|
/* ARGSUSED */
|
|
static void
|
|
discard_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
|
|
{
|
|
char buffer[BUFSIZE];
|
|
|
|
(void) read(s, buffer, sizeof(buffer));
|
|
}
|
|
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
|
|
|
|
|
|
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
|
|
#define LINESIZ 72
|
|
static char ring[128];
|
|
static char *endring;
|
|
|
|
static void
|
|
initring(void)
|
|
{
|
|
int i;
|
|
|
|
endring = ring;
|
|
|
|
for (i = 0; i <= 128; ++i)
|
|
if (isprint(i))
|
|
*endring++ = i;
|
|
}
|
|
|
|
/* Character generator */
|
|
/* ARGSUSED */
|
|
static void
|
|
chargen_stream(int s, servtab_t *sep)
|
|
{
|
|
char *rs;
|
|
int len;
|
|
char text[LINESIZ + 2];
|
|
|
|
inetd_setproctitle(sep->se_service, s);
|
|
|
|
if (!endring) {
|
|
initring();
|
|
rs = ring;
|
|
}
|
|
|
|
text[LINESIZ] = '\r';
|
|
text[LINESIZ + 1] = '\n';
|
|
rs = ring;
|
|
for (;;) {
|
|
len = endring - rs;
|
|
if (len >= LINESIZ)
|
|
memmove(text, rs, LINESIZ);
|
|
else {
|
|
memmove(text, rs, len);
|
|
memmove(text + len, ring, LINESIZ - len);
|
|
}
|
|
if (++rs == endring)
|
|
rs = ring;
|
|
if (write(s, text, sizeof(text)) != sizeof(text))
|
|
break;
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
/* Character generator */
|
|
/* ARGSUSED */
|
|
static void
|
|
chargen_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
|
|
{
|
|
/* struct sockaddr_storage ss; */
|
|
struct sockaddr sa;
|
|
static char *rs;
|
|
int len;
|
|
char text[LINESIZ + 2];
|
|
socklen_t size;
|
|
|
|
if (endring == 0) {
|
|
initring();
|
|
rs = ring;
|
|
}
|
|
|
|
size = sizeof(sa);
|
|
if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0)
|
|
return;
|
|
if (dg_badinput((struct sockaddr_in *) &sa))
|
|
return;
|
|
|
|
if ((len = endring - rs) >= LINESIZ)
|
|
memmove(text, rs, LINESIZ);
|
|
else {
|
|
memmove(text, rs, len);
|
|
memmove(text + len, ring, LINESIZ - len);
|
|
}
|
|
if (++rs == endring)
|
|
rs = ring;
|
|
text[LINESIZ] = '\r';
|
|
text[LINESIZ + 1] = '\n';
|
|
(void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa));
|
|
}
|
|
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
|
|
|
|
|
|
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
|
|
/*
|
|
* Return a machine readable date and time, in the form of the
|
|
* number of seconds since midnight, Jan 1, 1900. Since gettimeofday
|
|
* returns the number of seconds since midnight, Jan 1, 1970,
|
|
* we must add 2208988800 seconds to this figure to make up for
|
|
* some seventy years Bell Labs was asleep.
|
|
*/
|
|
|
|
static unsigned machtime(void)
|
|
{
|
|
struct timeval tv;
|
|
|
|
if (gettimeofday(&tv, NULL) < 0) {
|
|
fprintf(stderr, "Unable to get time of day\n");
|
|
return 0L;
|
|
}
|
|
return htonl((unsigned) tv.tv_sec + 2208988800UL);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
machtime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
|
|
{
|
|
unsigned result;
|
|
|
|
result = machtime();
|
|
(void) write(s, (char *) &result, sizeof(result));
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
machtime_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
|
|
{
|
|
unsigned result;
|
|
/* struct sockaddr_storage ss; */
|
|
struct sockaddr sa;
|
|
struct sockaddr_in *dg_sin;
|
|
socklen_t size;
|
|
|
|
size = sizeof(sa);
|
|
if (recvfrom(s, (char *) &result, sizeof(result), 0, &sa, &size) < 0)
|
|
return;
|
|
/* if (dg_badinput((struct sockaddr *)&ss)) */
|
|
dg_sin = (struct sockaddr_in *) &sa;
|
|
if (dg_sin->sin_addr.s_addr == htonl(INADDR_BROADCAST) ||
|
|
ntohs(dg_sin->sin_port) < IPPORT_RESERVED / 2)
|
|
return;
|
|
result = machtime();
|
|
(void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa));
|
|
}
|
|
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
|
|
|
|
|
|
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
|
|
/* Return human-readable time of day */
|
|
/* ARGSUSED */
|
|
static void daytime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
|
|
{
|
|
char buffer[32];
|
|
time_t t;
|
|
|
|
t = time(NULL);
|
|
|
|
// fdprintf instead?
|
|
(void) sprintf(buffer, "%.24s\r\n", ctime(&t));
|
|
(void) write(s, buffer, strlen(buffer));
|
|
}
|
|
|
|
/* Return human-readable time of day */
|
|
/* ARGSUSED */
|
|
void
|
|
daytime_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
|
|
{
|
|
char buffer[256];
|
|
time_t t;
|
|
/* struct sockaddr_storage ss; */
|
|
struct sockaddr sa;
|
|
socklen_t size;
|
|
|
|
t = time(NULL);
|
|
|
|
size = sizeof(sa);
|
|
if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0)
|
|
return;
|
|
if (dg_badinput((struct sockaddr_in *) &sa))
|
|
return;
|
|
(void) sprintf(buffer, "%.24s\r\n", ctime(&t));
|
|
(void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa));
|
|
}
|
|
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */
|