mirror of
https://github.com/sheumann/hush.git
synced 2024-08-18 21:29:23 +00:00
function old new delta launch_helper 170 169 -1 setup_heredoc 312 302 -10 handle_dir_common 367 354 -13 expand_vars_to_list 2456 2443 -13 open_transformer 89 74 -15 data_extract_to_command 439 423 -16 do_ipaddr 1406 1389 -17 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/7 up/down: 0/-85) Total: -85 bytes Signed-off-by: Pascal Bellard <pascal.bellard@ads-lu.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1606 lines
47 KiB
C
1606 lines
47 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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/* IPv6 support, many bug fixes by Denys Vlasenko (c) 2008 */
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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 configured services when a connection
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* from a peer is established or a datagram arrives.
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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 peer's host
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* and port.
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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. peer's address can be obtained
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* using recvfrom.
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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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* (usually "tcp" or "udp")
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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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* rpc/protocol "rpc/tcp" etc
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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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/* Despite of above doc saying that dgram services must use "wait",
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* "udp nowait" servers are implemented in busyboxed inetd.
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* IPv6 addresses are also implemented. However, they may look ugly -
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* ":::service..." means "address '::' (IPv6 wildcard addr)":"service"...
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* You have to put "tcp6"/"udp6" in protocol field to select IPv6.
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*/
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/* Here's the scoop concerning the user[:group] feature:
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* 1) group is not specified:
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* a) user = root: NO setuid() or setgid() is done
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* b) other: initgroups(name, primary group)
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* setgid(primary group as found in passwd)
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* setuid()
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* 2) group is specified:
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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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* b) other: initgroups(name, specified group)
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* setgid(specified group)
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* setuid()
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*/
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#include <syslog.h>
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#include <sys/un.h>
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#include "libbb.h"
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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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#if !BB_MMU
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/* stream version of chargen is forking but not execing,
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* can't do that (easily) on NOMMU */
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#undef ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
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#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN 0
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#endif
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#define _PATH_INETDPID "/var/run/inetd.pid"
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#define CNT_INTERVAL 60 /* servers in CNT_INTERVAL sec. */
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#define RETRYTIME 60 /* retry after bind or server fail */
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// TODO: explain, or get rid of setrlimit games
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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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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD \
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|| ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO \
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|| ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN \
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|| ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME \
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|| ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
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# define INETD_BUILTINS_ENABLED
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#endif
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typedef struct servtab_t {
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/* The most frequently referenced one: */
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int se_fd; /* open descriptor */
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/* NB: 'biggest fields last' saves on code size (~250 bytes) */
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/* [addr:]service socktype proto wait user[:group] prog [args] */
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char *se_local_hostname; /* addr to listen on */
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char *se_service; /* "80" or "www" or "mount/2[-3]" */
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/* socktype is in se_socktype */ /* "stream" "dgram" "raw" "rdm" "seqpacket" */
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char *se_proto; /* "unix" or "[rpc/]tcp[6]" */
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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_rpcver_lo; /* rpc program lowest version */
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int se_rpcver_hi; /* rpc program highest version */
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#define is_rpc_service(sep) ((sep)->se_rpcver_lo != 0)
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#else
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#define is_rpc_service(sep) 0
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#endif
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pid_t se_wait; /* 0:"nowait", 1:"wait", >1:"wait" */
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/* and waiting for this pid */
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socktype_t se_socktype; /* SOCK_STREAM/DGRAM/RDM/... */
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family_t se_family; /* AF_UNIX/INET[6] */
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/* se_proto_no is used by RPC code only... hmm */
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smallint se_proto_no; /* IPPROTO_TCP/UDP, n/a for AF_UNIX */
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smallint se_checked; /* looked at during merge */
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unsigned se_max; /* allowed instances per minute */
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unsigned se_count; /* number started since se_time */
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unsigned se_time; /* when we started counting */
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char *se_user; /* user name to run as */
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char *se_group; /* group name to run as, can be NULL */
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#ifdef INETD_BUILTINS_ENABLED
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const struct builtin *se_builtin; /* if built-in, description */
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#endif
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struct servtab_t *se_next;
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len_and_sockaddr *se_lsa;
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char *se_program; /* server program */
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#define MAXARGV 20
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char *se_argv[MAXARGV + 1]; /* program arguments */
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} servtab_t;
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#ifdef INETD_BUILTINS_ENABLED
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/* Echo received data */
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
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static void FAST_FUNC echo_stream(int, servtab_t *);
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static void FAST_FUNC 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 FAST_FUNC discard_stream(int, servtab_t *);
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static void FAST_FUNC 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 FAST_FUNC machtime_stream(int, servtab_t *);
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static void FAST_FUNC 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 FAST_FUNC daytime_stream(int, servtab_t *);
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static void FAST_FUNC 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 FAST_FUNC chargen_stream(int, servtab_t *);
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static void FAST_FUNC chargen_dg(int, servtab_t *);
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#endif
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struct builtin {
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/* NB: not necessarily NUL terminated */
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char bi_service7[7]; /* internally provided service name */
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uint8_t bi_fork; /* 1 if stream fn should run in child */
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void (*bi_stream_fn)(int, servtab_t *) FAST_FUNC;
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void (*bi_dgram_fn)(int, servtab_t *) FAST_FUNC;
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};
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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", 1, echo_stream, echo_dg },
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
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{ "discard", 1, discard_stream, discard_dg },
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
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{ "chargen", 1, chargen_stream, chargen_dg },
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
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{ "time", 0, machtime_stream, machtime_dg },
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
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{ "daytime", 0, daytime_stream, daytime_dg },
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#endif
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};
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#endif /* INETD_BUILTINS_ENABLED */
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struct globals {
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rlim_t rlim_ofile_cur;
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struct rlimit rlim_ofile;
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servtab_t *serv_list;
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int global_queuelen;
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int maxsock; /* max fd# in allsock, -1: unknown */
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/* whenever maxsock grows, prev_maxsock is set to new maxsock,
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* but if maxsock is set to -1, prev_maxsock is not changed */
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int prev_maxsock;
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unsigned max_concurrency;
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smallint alarm_armed;
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uid_t real_uid; /* user ID who ran us */
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const char *config_filename;
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parser_t *parser;
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char *default_local_hostname;
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
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char *end_ring;
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char *ring_pos;
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char ring[128];
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#endif
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fd_set allsock;
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/* Used in next_line(), and as scratch read buffer */
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char line[256]; /* _at least_ 256, see LINE_SIZE */
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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enum { LINE_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line) };
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struct BUG_G_too_big {
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char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
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};
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#define rlim_ofile_cur (G.rlim_ofile_cur )
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#define rlim_ofile (G.rlim_ofile )
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#define serv_list (G.serv_list )
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#define global_queuelen (G.global_queuelen)
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#define maxsock (G.maxsock )
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#define prev_maxsock (G.prev_maxsock )
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#define max_concurrency (G.max_concurrency)
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#define alarm_armed (G.alarm_armed )
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#define real_uid (G.real_uid )
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#define config_filename (G.config_filename)
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#define parser (G.parser )
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#define default_local_hostname (G.default_local_hostname)
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#define first_ps_byte (G.first_ps_byte )
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#define last_ps_byte (G.last_ps_byte )
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#define end_ring (G.end_ring )
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#define ring_pos (G.ring_pos )
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#define ring (G.ring )
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#define allsock (G.allsock )
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#define line (G.line )
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#define INIT_G() do { \
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rlim_ofile_cur = OPEN_MAX; \
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global_queuelen = 128; \
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config_filename = "/etc/inetd.conf"; \
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} while (0)
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|
|
static void maybe_close(int fd)
|
|
{
|
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if (fd >= 0)
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close(fd);
|
|
}
|
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|
|
// TODO: move to libbb?
|
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static len_and_sockaddr *xzalloc_lsa(int family)
|
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{
|
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len_and_sockaddr *lsa;
|
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int sz;
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|
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sz = sizeof(struct sockaddr_in);
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if (family == AF_UNIX)
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sz = sizeof(struct sockaddr_un);
|
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#if ENABLE_FEATURE_IPV6
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if (family == AF_INET6)
|
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sz = sizeof(struct sockaddr_in6);
|
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#endif
|
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lsa = xzalloc(LSA_LEN_SIZE + sz);
|
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lsa->len = sz;
|
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lsa->u.sa.sa_family = family;
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return lsa;
|
|
}
|
|
|
|
static void rearm_alarm(void)
|
|
{
|
|
if (!alarm_armed) {
|
|
alarm_armed = 1;
|
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alarm(RETRYTIME);
|
|
}
|
|
}
|
|
|
|
static void block_CHLD_HUP_ALRM(sigset_t *m)
|
|
{
|
|
sigemptyset(m);
|
|
sigaddset(m, SIGCHLD);
|
|
sigaddset(m, SIGHUP);
|
|
sigaddset(m, SIGALRM);
|
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sigprocmask(SIG_BLOCK, m, m); /* old sigmask is stored in m */
|
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}
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|
|
|
static void restore_sigmask(sigset_t *m)
|
|
{
|
|
sigprocmask(SIG_SETMASK, m, NULL);
|
|
}
|
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|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
static void register_rpc(servtab_t *sep)
|
|
{
|
|
int n;
|
|
struct sockaddr_in ir_sin;
|
|
socklen_t size;
|
|
|
|
size = sizeof(ir_sin);
|
|
if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
|
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bb_perror_msg("getsockname");
|
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return;
|
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}
|
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|
|
for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
|
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pmap_unset(sep->se_rpcprog, n);
|
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if (!pmap_set(sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port)))
|
|
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, sep->se_proto_no, ntohs(ir_sin.sin_port));
|
|
}
|
|
}
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|
|
|
static void unregister_rpc(servtab_t *sep)
|
|
{
|
|
int n;
|
|
|
|
for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
|
|
if (!pmap_unset(sep->se_rpcprog, n))
|
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bb_perror_msg("pmap_unset(%u,%u)", sep->se_rpcprog, n);
|
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}
|
|
}
|
|
#endif /* FEATURE_INETD_RPC */
|
|
|
|
static void bump_nofile(void)
|
|
{
|
|
enum { FD_CHUNK = 32 };
|
|
struct rlimit rl;
|
|
|
|
/* Never fails under Linux (except if you pass it bad arguments) */
|
|
getrlimit(RLIMIT_NOFILE, &rl);
|
|
rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK);
|
|
rl.rlim_cur = MIN(FD_SETSIZE, rl.rlim_cur + FD_CHUNK);
|
|
if (rl.rlim_cur <= rlim_ofile_cur) {
|
|
bb_error_msg("can't extend file limit, max = %d",
|
|
(int) rl.rlim_cur);
|
|
return;
|
|
}
|
|
|
|
if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
|
|
bb_perror_msg("setrlimit");
|
|
return;
|
|
}
|
|
|
|
rlim_ofile_cur = rl.rlim_cur;
|
|
}
|
|
|
|
static void remove_fd_from_set(int fd)
|
|
{
|
|
if (fd >= 0) {
|
|
FD_CLR(fd, &allsock);
|
|
maxsock = -1;
|
|
}
|
|
}
|
|
|
|
static void add_fd_to_set(int fd)
|
|
{
|
|
if (fd >= 0) {
|
|
FD_SET(fd, &allsock);
|
|
if (maxsock >= 0 && fd > maxsock) {
|
|
prev_maxsock = maxsock = fd;
|
|
if ((rlim_t)fd > rlim_ofile_cur - FD_MARGIN)
|
|
bump_nofile();
|
|
}
|
|
}
|
|
}
|
|
|
|
static void recalculate_maxsock(void)
|
|
{
|
|
int fd = 0;
|
|
|
|
/* We may have no services, in this case maxsock should still be >= 0
|
|
* (code elsewhere is not happy with maxsock == -1) */
|
|
maxsock = 0;
|
|
while (fd <= prev_maxsock) {
|
|
if (FD_ISSET(fd, &allsock))
|
|
maxsock = fd;
|
|
fd++;
|
|
}
|
|
prev_maxsock = maxsock;
|
|
if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
|
|
bump_nofile();
|
|
}
|
|
|
|
static void prepare_socket_fd(servtab_t *sep)
|
|
{
|
|
int r, fd;
|
|
|
|
fd = socket(sep->se_family, sep->se_socktype, 0);
|
|
if (fd < 0) {
|
|
bb_perror_msg("socket");
|
|
return;
|
|
}
|
|
setsockopt_reuseaddr(fd);
|
|
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
if (is_rpc_service(sep)) {
|
|
struct passwd *pwd;
|
|
|
|
/* zero out the port for all RPC services; let bind()
|
|
* find one. */
|
|
set_nport(sep->se_lsa, 0);
|
|
|
|
/* for RPC services, attempt to use a reserved port
|
|
* if they are going to be running as root. */
|
|
if (real_uid == 0 && sep->se_family == AF_INET
|
|
&& (pwd = getpwnam(sep->se_user)) != NULL
|
|
&& pwd->pw_uid == 0
|
|
) {
|
|
r = bindresvport(fd, &sep->se_lsa->u.sin);
|
|
} else {
|
|
r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
|
|
}
|
|
if (r == 0) {
|
|
int saveerrno = errno;
|
|
/* update lsa with port# */
|
|
getsockname(fd, &sep->se_lsa->u.sa, &sep->se_lsa->len);
|
|
errno = saveerrno;
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
if (sep->se_family == AF_UNIX) {
|
|
struct sockaddr_un *sun;
|
|
sun = (struct sockaddr_un*)&(sep->se_lsa->u.sa);
|
|
unlink(sun->sun_path);
|
|
}
|
|
r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
|
|
}
|
|
if (r < 0) {
|
|
bb_perror_msg("%s/%s: bind",
|
|
sep->se_service, sep->se_proto);
|
|
close(fd);
|
|
rearm_alarm();
|
|
return;
|
|
}
|
|
if (sep->se_socktype == SOCK_STREAM)
|
|
listen(fd, global_queuelen);
|
|
|
|
add_fd_to_set(fd);
|
|
sep->se_fd = fd;
|
|
}
|
|
|
|
static int reopen_config_file(void)
|
|
{
|
|
free(default_local_hostname);
|
|
default_local_hostname = xstrdup("*");
|
|
if (parser != NULL)
|
|
config_close(parser);
|
|
parser = config_open(config_filename);
|
|
return (parser != NULL);
|
|
}
|
|
|
|
static void close_config_file(void)
|
|
{
|
|
if (parser) {
|
|
config_close(parser);
|
|
parser = NULL;
|
|
}
|
|
}
|
|
|
|
static void free_servtab_strings(servtab_t *cp)
|
|
{
|
|
int i;
|
|
|
|
free(cp->se_local_hostname);
|
|
free(cp->se_service);
|
|
free(cp->se_proto);
|
|
free(cp->se_user);
|
|
free(cp->se_group);
|
|
free(cp->se_lsa); /* not a string in fact */
|
|
free(cp->se_program);
|
|
for (i = 0; i < MAXARGV; i++)
|
|
free(cp->se_argv[i]);
|
|
}
|
|
|
|
static servtab_t *new_servtab(void)
|
|
{
|
|
servtab_t *newtab = xzalloc(sizeof(servtab_t));
|
|
newtab->se_fd = -1; /* paranoia */
|
|
return newtab;
|
|
}
|
|
|
|
static servtab_t *dup_servtab(servtab_t *sep)
|
|
{
|
|
servtab_t *newtab;
|
|
int argc;
|
|
|
|
newtab = new_servtab();
|
|
*newtab = *sep; /* struct copy */
|
|
/* deep-copying strings */
|
|
newtab->se_service = xstrdup(newtab->se_service);
|
|
newtab->se_proto = xstrdup(newtab->se_proto);
|
|
newtab->se_user = xstrdup(newtab->se_user);
|
|
newtab->se_group = xstrdup(newtab->se_group);
|
|
newtab->se_program = xstrdup(newtab->se_program);
|
|
for (argc = 0; argc <= MAXARGV; argc++)
|
|
newtab->se_argv[argc] = xstrdup(newtab->se_argv[argc]);
|
|
/* NB: se_fd, se_hostaddr and se_next are always
|
|
* overwrittend by callers, so we don't bother resetting them
|
|
* to NULL/0/-1 etc */
|
|
|
|
return newtab;
|
|
}
|
|
|
|
/* gcc generates much more code if this is inlined */
|
|
static servtab_t *parse_one_line(void)
|
|
{
|
|
int argc;
|
|
char *token[6+MAXARGV];
|
|
char *p, *arg;
|
|
char *hostdelim;
|
|
servtab_t *sep;
|
|
servtab_t *nsep;
|
|
new:
|
|
sep = new_servtab();
|
|
more:
|
|
argc = config_read(parser, token, 6+MAXARGV, 1, "# \t", PARSE_NORMAL);
|
|
if (!argc) {
|
|
free(sep);
|
|
return NULL;
|
|
}
|
|
|
|
/* [host:]service socktype proto wait user[:group] prog [args] */
|
|
/* Check for "host:...." line */
|
|
arg = token[0];
|
|
hostdelim = strrchr(arg, ':');
|
|
if (hostdelim) {
|
|
*hostdelim = '\0';
|
|
sep->se_local_hostname = xstrdup(arg);
|
|
arg = hostdelim + 1;
|
|
if (*arg == '\0' && argc == 1) {
|
|
/* Line has just "host:", change the
|
|
* default host for the following lines. */
|
|
free(default_local_hostname);
|
|
default_local_hostname = sep->se_local_hostname;
|
|
goto more;
|
|
}
|
|
} else
|
|
sep->se_local_hostname = xstrdup(default_local_hostname);
|
|
|
|
/* service socktype proto wait user[:group] prog [args] */
|
|
sep->se_service = xstrdup(arg);
|
|
|
|
/* socktype proto wait user[:group] prog [args] */
|
|
if (argc < 6) {
|
|
parse_err:
|
|
bb_error_msg("parse error on line %u, line is ignored",
|
|
parser->lineno);
|
|
free_servtab_strings(sep);
|
|
/* Just "goto more" can make sep to carry over e.g.
|
|
* "rpc"-ness (by having se_rpcver_lo != 0).
|
|
* We will be more paranoid: */
|
|
free(sep);
|
|
goto new;
|
|
}
|
|
|
|
{
|
|
static const int8_t SOCK_xxx[] ALIGN1 = {
|
|
-1,
|
|
SOCK_STREAM, SOCK_DGRAM, SOCK_RDM,
|
|
SOCK_SEQPACKET, SOCK_RAW
|
|
};
|
|
sep->se_socktype = SOCK_xxx[1 + index_in_strings(
|
|
"stream""\0" "dgram""\0" "rdm""\0"
|
|
"seqpacket""\0" "raw""\0"
|
|
, token[1])];
|
|
}
|
|
|
|
/* {unix,[rpc/]{tcp,udp}[6]} wait user[:group] prog [args] */
|
|
sep->se_proto = arg = xstrdup(token[2]);
|
|
if (strcmp(arg, "unix") == 0) {
|
|
sep->se_family = AF_UNIX;
|
|
} else {
|
|
char *six;
|
|
sep->se_family = AF_INET;
|
|
six = last_char_is(arg, '6');
|
|
if (six) {
|
|
#if ENABLE_FEATURE_IPV6
|
|
*six = '\0';
|
|
sep->se_family = AF_INET6;
|
|
#else
|
|
bb_error_msg("%s: no support for IPv6", sep->se_proto);
|
|
goto parse_err;
|
|
#endif
|
|
}
|
|
if (strncmp(arg, "rpc/", 4) == 0) {
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
unsigned n;
|
|
arg += 4;
|
|
p = strchr(sep->se_service, '/');
|
|
if (p == NULL) {
|
|
bb_error_msg("no rpc version: '%s'", sep->se_service);
|
|
goto parse_err;
|
|
}
|
|
*p++ = '\0';
|
|
n = bb_strtou(p, &p, 10);
|
|
if (n > INT_MAX) {
|
|
bad_ver_spec:
|
|
bb_error_msg("bad rpc version");
|
|
goto parse_err;
|
|
}
|
|
sep->se_rpcver_lo = sep->se_rpcver_hi = n;
|
|
if (*p == '-') {
|
|
p++;
|
|
n = bb_strtou(p, &p, 10);
|
|
if (n > INT_MAX || (int)n < sep->se_rpcver_lo)
|
|
goto bad_ver_spec;
|
|
sep->se_rpcver_hi = n;
|
|
}
|
|
if (*p != '\0')
|
|
goto bad_ver_spec;
|
|
#else
|
|
bb_error_msg("no support for rpc services");
|
|
goto parse_err;
|
|
#endif
|
|
}
|
|
/* we don't really need getprotobyname()! */
|
|
if (strcmp(arg, "tcp") == 0)
|
|
sep->se_proto_no = IPPROTO_TCP; /* = 6 */
|
|
if (strcmp(arg, "udp") == 0)
|
|
sep->se_proto_no = IPPROTO_UDP; /* = 17 */
|
|
if (six)
|
|
*six = '6';
|
|
if (!sep->se_proto_no) /* not tcp/udp?? */
|
|
goto parse_err;
|
|
}
|
|
|
|
/* [no]wait[.max] user[:group] prog [args] */
|
|
arg = token[3];
|
|
sep->se_max = max_concurrency;
|
|
p = strchr(arg, '.');
|
|
if (p) {
|
|
*p++ = '\0';
|
|
sep->se_max = bb_strtou(p, NULL, 10);
|
|
if (errno)
|
|
goto parse_err;
|
|
}
|
|
sep->se_wait = (arg[0] != 'n' || arg[1] != 'o');
|
|
if (!sep->se_wait) /* "no" seen */
|
|
arg += 2;
|
|
if (strcmp(arg, "wait") != 0)
|
|
goto parse_err;
|
|
|
|
/* user[:group] prog [args] */
|
|
sep->se_user = xstrdup(token[4]);
|
|
arg = strchr(sep->se_user, '.');
|
|
if (arg == NULL)
|
|
arg = strchr(sep->se_user, ':');
|
|
if (arg) {
|
|
*arg++ = '\0';
|
|
sep->se_group = xstrdup(arg);
|
|
}
|
|
|
|
/* prog [args] */
|
|
sep->se_program = xstrdup(token[5]);
|
|
#ifdef INETD_BUILTINS_ENABLED
|
|
if (strcmp(sep->se_program, "internal") == 0
|
|
&& strlen(sep->se_service) <= 7
|
|
&& (sep->se_socktype == SOCK_STREAM
|
|
|| sep->se_socktype == SOCK_DGRAM)
|
|
) {
|
|
unsigned i;
|
|
for (i = 0; i < ARRAY_SIZE(builtins); i++)
|
|
if (strncmp(builtins[i].bi_service7, sep->se_service, 7) == 0)
|
|
goto found_bi;
|
|
bb_error_msg("unknown internal service %s", sep->se_service);
|
|
goto parse_err;
|
|
found_bi:
|
|
sep->se_builtin = &builtins[i];
|
|
/* stream builtins must be "nowait", dgram must be "wait" */
|
|
if (sep->se_wait != (sep->se_socktype == SOCK_DGRAM))
|
|
goto parse_err;
|
|
}
|
|
#endif
|
|
argc = 0;
|
|
while ((arg = token[6+argc]) != NULL && argc < MAXARGV)
|
|
sep->se_argv[argc++] = xstrdup(arg);
|
|
|
|
/* catch mixups. "<service> stream udp ..." == wtf */
|
|
if (sep->se_socktype == SOCK_STREAM) {
|
|
if (sep->se_proto_no == IPPROTO_UDP)
|
|
goto parse_err;
|
|
}
|
|
if (sep->se_socktype == SOCK_DGRAM) {
|
|
if (sep->se_proto_no == IPPROTO_TCP)
|
|
goto parse_err;
|
|
}
|
|
|
|
// bb_info_msg(
|
|
// "ENTRY[%s][%s][%s][%d][%d][%d][%d][%d][%s][%s][%s]",
|
|
// sep->se_local_hostname, sep->se_service, sep->se_proto, sep->se_wait, sep->se_proto_no,
|
|
// sep->se_max, sep->se_count, sep->se_time, sep->se_user, sep->se_group, sep->se_program);
|
|
|
|
/* check if the hostname specifier is a comma separated list
|
|
* of hostnames. we'll make new entries for each address. */
|
|
while ((hostdelim = strrchr(sep->se_local_hostname, ',')) != NULL) {
|
|
nsep = dup_servtab(sep);
|
|
/* NUL terminate the hostname field of the existing entry,
|
|
* and make a dup for the new entry. */
|
|
*hostdelim++ = '\0';
|
|
nsep->se_local_hostname = xstrdup(hostdelim);
|
|
nsep->se_next = sep->se_next;
|
|
sep->se_next = nsep;
|
|
}
|
|
|
|
/* was doing it here: */
|
|
/* DNS resolution, create copies for each IP address */
|
|
/* IPv6-ization destroyed it :( */
|
|
|
|
return sep;
|
|
}
|
|
|
|
static servtab_t *insert_in_servlist(servtab_t *cp)
|
|
{
|
|
servtab_t *sep;
|
|
sigset_t omask;
|
|
|
|
sep = new_servtab();
|
|
*sep = *cp; /* struct copy */
|
|
sep->se_fd = -1;
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
sep->se_rpcprog = -1;
|
|
#endif
|
|
block_CHLD_HUP_ALRM(&omask);
|
|
sep->se_next = serv_list;
|
|
serv_list = sep;
|
|
restore_sigmask(&omask);
|
|
return sep;
|
|
}
|
|
|
|
static int same_serv_addr_proto(servtab_t *old, servtab_t *new)
|
|
{
|
|
if (strcmp(old->se_local_hostname, new->se_local_hostname) != 0)
|
|
return 0;
|
|
if (strcmp(old->se_service, new->se_service) != 0)
|
|
return 0;
|
|
if (strcmp(old->se_proto, new->se_proto) != 0)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static void reread_config_file(int sig UNUSED_PARAM)
|
|
{
|
|
servtab_t *sep, *cp, **sepp;
|
|
len_and_sockaddr *lsa;
|
|
sigset_t omask;
|
|
unsigned n;
|
|
uint16_t port;
|
|
int save_errno = errno;
|
|
|
|
if (!reopen_config_file())
|
|
goto ret;
|
|
for (sep = serv_list; sep; sep = sep->se_next)
|
|
sep->se_checked = 0;
|
|
|
|
goto first_line;
|
|
while (1) {
|
|
if (cp == NULL) {
|
|
first_line:
|
|
cp = parse_one_line();
|
|
if (cp == NULL)
|
|
break;
|
|
}
|
|
for (sep = serv_list; sep; sep = sep->se_next)
|
|
if (same_serv_addr_proto(sep, cp))
|
|
goto equal_servtab;
|
|
/* not an "equal" servtab */
|
|
sep = insert_in_servlist(cp);
|
|
goto after_check;
|
|
equal_servtab:
|
|
{
|
|
int i;
|
|
|
|
block_CHLD_HUP_ALRM(&omask);
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
if (is_rpc_service(sep))
|
|
unregister_rpc(sep);
|
|
sep->se_rpcver_lo = cp->se_rpcver_lo;
|
|
sep->se_rpcver_hi = cp->se_rpcver_hi;
|
|
#endif
|
|
if (cp->se_wait == 0) {
|
|
/* New config says "nowait". If old one
|
|
* was "wait", we currently may be waiting
|
|
* for a child (and not accepting connects).
|
|
* Stop waiting, start listening again.
|
|
* (if it's not true, this op is harmless) */
|
|
add_fd_to_set(sep->se_fd);
|
|
}
|
|
sep->se_wait = cp->se_wait;
|
|
sep->se_max = cp->se_max;
|
|
/* string fields need more love - we don't want to leak them */
|
|
#define SWAP(type, a, b) do { type c = (type)a; a = (type)b; b = (type)c; } while (0)
|
|
SWAP(char*, sep->se_user, cp->se_user);
|
|
SWAP(char*, sep->se_group, cp->se_group);
|
|
SWAP(char*, sep->se_program, cp->se_program);
|
|
for (i = 0; i < MAXARGV; i++)
|
|
SWAP(char*, sep->se_argv[i], cp->se_argv[i]);
|
|
#undef SWAP
|
|
restore_sigmask(&omask);
|
|
free_servtab_strings(cp);
|
|
}
|
|
after_check:
|
|
/* cp->string_fields are consumed by insert_in_servlist()
|
|
* or freed at this point, cp itself is not yet freed. */
|
|
sep->se_checked = 1;
|
|
|
|
/* create new len_and_sockaddr */
|
|
switch (sep->se_family) {
|
|
struct sockaddr_un *sun;
|
|
case AF_UNIX:
|
|
lsa = xzalloc_lsa(AF_UNIX);
|
|
sun = (struct sockaddr_un*)&lsa->u.sa;
|
|
safe_strncpy(sun->sun_path, sep->se_service, sizeof(sun->sun_path));
|
|
break;
|
|
|
|
default: /* case AF_INET, case AF_INET6 */
|
|
n = bb_strtou(sep->se_service, NULL, 10);
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
if (is_rpc_service(sep)) {
|
|
sep->se_rpcprog = n;
|
|
if (errno) { /* se_service is not numeric */
|
|
struct rpcent *rp = getrpcbyname(sep->se_service);
|
|
if (rp == NULL) {
|
|
bb_error_msg("%s: unknown rpc service", sep->se_service);
|
|
goto next_cp;
|
|
}
|
|
sep->se_rpcprog = rp->r_number;
|
|
}
|
|
if (sep->se_fd == -1)
|
|
prepare_socket_fd(sep);
|
|
if (sep->se_fd != -1)
|
|
register_rpc(sep);
|
|
goto next_cp;
|
|
}
|
|
#endif
|
|
/* what port to listen on? */
|
|
port = htons(n);
|
|
if (errno || n > 0xffff) { /* se_service is not numeric */
|
|
char protoname[4];
|
|
struct servent *sp;
|
|
/* can result only in "tcp" or "udp": */
|
|
safe_strncpy(protoname, sep->se_proto, 4);
|
|
sp = getservbyname(sep->se_service, protoname);
|
|
if (sp == NULL) {
|
|
bb_error_msg("%s/%s: unknown service",
|
|
sep->se_service, sep->se_proto);
|
|
goto next_cp;
|
|
}
|
|
port = sp->s_port;
|
|
}
|
|
if (LONE_CHAR(sep->se_local_hostname, '*')) {
|
|
lsa = xzalloc_lsa(sep->se_family);
|
|
set_nport(lsa, port);
|
|
} else {
|
|
lsa = host_and_af2sockaddr(sep->se_local_hostname,
|
|
ntohs(port), sep->se_family);
|
|
if (!lsa) {
|
|
bb_error_msg("%s/%s: unknown host '%s'",
|
|
sep->se_service, sep->se_proto,
|
|
sep->se_local_hostname);
|
|
goto next_cp;
|
|
}
|
|
}
|
|
break;
|
|
} /* end of "switch (sep->se_family)" */
|
|
|
|
/* did lsa change? Then close/open */
|
|
if (sep->se_lsa == NULL
|
|
|| lsa->len != sep->se_lsa->len
|
|
|| memcmp(&lsa->u.sa, &sep->se_lsa->u.sa, lsa->len) != 0
|
|
) {
|
|
remove_fd_from_set(sep->se_fd);
|
|
maybe_close(sep->se_fd);
|
|
free(sep->se_lsa);
|
|
sep->se_lsa = lsa;
|
|
sep->se_fd = -1;
|
|
} else {
|
|
free(lsa);
|
|
}
|
|
if (sep->se_fd == -1)
|
|
prepare_socket_fd(sep);
|
|
next_cp:
|
|
sep = cp->se_next;
|
|
free(cp);
|
|
cp = sep;
|
|
} /* end of "while (1) parse lines" */
|
|
close_config_file();
|
|
|
|
/* Purge anything not looked at above - these are stale entries,
|
|
* new config file doesnt have them. */
|
|
block_CHLD_HUP_ALRM(&omask);
|
|
sepp = &serv_list;
|
|
while ((sep = *sepp)) {
|
|
if (sep->se_checked) {
|
|
sepp = &sep->se_next;
|
|
continue;
|
|
}
|
|
*sepp = sep->se_next;
|
|
remove_fd_from_set(sep->se_fd);
|
|
maybe_close(sep->se_fd);
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
if (is_rpc_service(sep))
|
|
unregister_rpc(sep);
|
|
#endif
|
|
if (sep->se_family == AF_UNIX)
|
|
unlink(sep->se_service);
|
|
free_servtab_strings(sep);
|
|
free(sep);
|
|
}
|
|
restore_sigmask(&omask);
|
|
ret:
|
|
errno = save_errno;
|
|
}
|
|
|
|
static void reap_child(int sig UNUSED_PARAM)
|
|
{
|
|
pid_t pid;
|
|
int status;
|
|
servtab_t *sep;
|
|
int save_errno = errno;
|
|
|
|
for (;;) {
|
|
pid = wait_any_nohang(&status);
|
|
if (pid <= 0)
|
|
break;
|
|
for (sep = serv_list; sep; sep = sep->se_next) {
|
|
if (sep->se_wait != pid)
|
|
continue;
|
|
/* One of our "wait" services */
|
|
if (WIFEXITED(status) && WEXITSTATUS(status))
|
|
bb_error_msg("%s: exit status %u",
|
|
sep->se_program, WEXITSTATUS(status));
|
|
else if (WIFSIGNALED(status))
|
|
bb_error_msg("%s: exit signal %u",
|
|
sep->se_program, WTERMSIG(status));
|
|
sep->se_wait = 1;
|
|
add_fd_to_set(sep->se_fd);
|
|
break;
|
|
}
|
|
}
|
|
errno = save_errno;
|
|
}
|
|
|
|
static void retry_network_setup(int sig UNUSED_PARAM)
|
|
{
|
|
int save_errno = errno;
|
|
servtab_t *sep;
|
|
|
|
alarm_armed = 0;
|
|
for (sep = serv_list; sep; sep = sep->se_next) {
|
|
if (sep->se_fd == -1) {
|
|
prepare_socket_fd(sep);
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
if (sep->se_fd != -1 && is_rpc_service(sep))
|
|
register_rpc(sep);
|
|
#endif
|
|
}
|
|
}
|
|
errno = save_errno;
|
|
}
|
|
|
|
static void clean_up_and_exit(int sig UNUSED_PARAM)
|
|
{
|
|
servtab_t *sep;
|
|
|
|
/* XXX signal race walking sep list */
|
|
for (sep = serv_list; sep; sep = sep->se_next) {
|
|
if (sep->se_fd == -1)
|
|
continue;
|
|
|
|
switch (sep->se_family) {
|
|
case AF_UNIX:
|
|
unlink(sep->se_service);
|
|
break;
|
|
default: /* case AF_INET, AF_INET6 */
|
|
#if ENABLE_FEATURE_INETD_RPC
|
|
if (sep->se_wait == 1 && is_rpc_service(sep))
|
|
unregister_rpc(sep); /* XXX signal race */
|
|
#endif
|
|
break;
|
|
}
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
close(sep->se_fd);
|
|
}
|
|
remove_pidfile(_PATH_INETDPID);
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
int inetd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int inetd_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
struct sigaction sa, saved_pipe_handler;
|
|
servtab_t *sep, *sep2;
|
|
struct passwd *pwd;
|
|
struct group *grp = grp; /* for compiler */
|
|
int opt;
|
|
pid_t pid;
|
|
sigset_t omask;
|
|
|
|
INIT_G();
|
|
|
|
real_uid = getuid();
|
|
if (real_uid != 0) /* run by non-root user */
|
|
config_filename = NULL;
|
|
|
|
opt_complementary = "R+:q+"; /* -q N, -R N */
|
|
opt = getopt32(argv, "R:feq:", &max_concurrency, &global_queuelen);
|
|
argv += optind;
|
|
//argc -= optind;
|
|
if (argv[0])
|
|
config_filename = argv[0];
|
|
if (config_filename == NULL)
|
|
bb_error_msg_and_die("non-root must specify config file");
|
|
if (!(opt & 2))
|
|
bb_daemonize_or_rexec(0, argv - optind);
|
|
else
|
|
bb_sanitize_stdio();
|
|
if (!(opt & 4)) {
|
|
/* LOG_NDELAY: connect to syslog daemon NOW.
|
|
* Otherwise, we may open syslog socket
|
|
* in vforked child, making opened fds and syslog()
|
|
* internal state inconsistent.
|
|
* This was observed to leak file descriptors. */
|
|
openlog(applet_name, LOG_PID | LOG_NDELAY, LOG_DAEMON);
|
|
logmode = LOGMODE_SYSLOG;
|
|
}
|
|
|
|
if (real_uid == 0) {
|
|
/* run by root, ensure groups vector gets trashed */
|
|
gid_t gid = getgid();
|
|
setgroups(1, &gid);
|
|
}
|
|
|
|
write_pidfile(_PATH_INETDPID);
|
|
|
|
/* never fails under Linux (except if you pass it bad arguments) */
|
|
getrlimit(RLIMIT_NOFILE, &rlim_ofile);
|
|
rlim_ofile_cur = rlim_ofile.rlim_cur;
|
|
if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
|
|
rlim_ofile_cur = OPEN_MAX;
|
|
|
|
memset(&sa, 0, sizeof(sa));
|
|
/*sigemptyset(&sa.sa_mask); - memset did it */
|
|
sigaddset(&sa.sa_mask, SIGALRM);
|
|
sigaddset(&sa.sa_mask, SIGCHLD);
|
|
sigaddset(&sa.sa_mask, SIGHUP);
|
|
sa.sa_handler = retry_network_setup;
|
|
sigaction_set(SIGALRM, &sa);
|
|
sa.sa_handler = reread_config_file;
|
|
sigaction_set(SIGHUP, &sa);
|
|
sa.sa_handler = reap_child;
|
|
sigaction_set(SIGCHLD, &sa);
|
|
sa.sa_handler = clean_up_and_exit;
|
|
sigaction_set(SIGTERM, &sa);
|
|
sa.sa_handler = clean_up_and_exit;
|
|
sigaction_set(SIGINT, &sa);
|
|
sa.sa_handler = SIG_IGN;
|
|
sigaction(SIGPIPE, &sa, &saved_pipe_handler);
|
|
|
|
reread_config_file(SIGHUP); /* load config from file */
|
|
|
|
for (;;) {
|
|
int ready_fd_cnt;
|
|
int ctrl, accepted_fd, new_udp_fd;
|
|
fd_set readable;
|
|
|
|
if (maxsock < 0)
|
|
recalculate_maxsock();
|
|
|
|
readable = allsock; /* struct copy */
|
|
/* if there are no fds to wait on, we will block
|
|
* until signal wakes us up (maxsock == 0, but readable
|
|
* never contains fds 0 and 1...) */
|
|
ready_fd_cnt = select(maxsock + 1, &readable, NULL, NULL, NULL);
|
|
if (ready_fd_cnt < 0) {
|
|
if (errno != EINTR) {
|
|
bb_perror_msg("select");
|
|
sleep(1);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
for (sep = serv_list; ready_fd_cnt && sep; sep = sep->se_next) {
|
|
if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
|
|
continue;
|
|
|
|
ready_fd_cnt--;
|
|
ctrl = sep->se_fd;
|
|
accepted_fd = -1;
|
|
new_udp_fd = -1;
|
|
if (!sep->se_wait) {
|
|
if (sep->se_socktype == SOCK_STREAM) {
|
|
ctrl = accepted_fd = accept(sep->se_fd, NULL, NULL);
|
|
if (ctrl < 0) {
|
|
if (errno != EINTR)
|
|
bb_perror_msg("accept (for %s)", sep->se_service);
|
|
continue;
|
|
}
|
|
}
|
|
/* "nowait" udp */
|
|
if (sep->se_socktype == SOCK_DGRAM
|
|
&& sep->se_family != AF_UNIX
|
|
) {
|
|
/* How udp "nowait" works:
|
|
* child peeks at (received and buffered by kernel) UDP packet,
|
|
* performs connect() on the socket so that it is linked only
|
|
* to this peer. But this also affects parent, because descriptors
|
|
* are shared after fork() a-la dup(). When parent performs
|
|
* select(), it will see this descriptor connected to the peer (!)
|
|
* and still readable, will act on it and mess things up
|
|
* (can create many copies of same child, etc).
|
|
* Parent must create and use new socket instead. */
|
|
new_udp_fd = socket(sep->se_family, SOCK_DGRAM, 0);
|
|
if (new_udp_fd < 0) { /* error: eat packet, forget about it */
|
|
udp_err:
|
|
recv(sep->se_fd, line, LINE_SIZE, MSG_DONTWAIT);
|
|
continue;
|
|
}
|
|
setsockopt_reuseaddr(new_udp_fd);
|
|
/* TODO: better do bind after vfork in parent,
|
|
* so that we don't have two wildcard bound sockets
|
|
* even for a brief moment? */
|
|
if (bind(new_udp_fd, &sep->se_lsa->u.sa, sep->se_lsa->len) < 0) {
|
|
close(new_udp_fd);
|
|
goto udp_err;
|
|
}
|
|
}
|
|
}
|
|
|
|
block_CHLD_HUP_ALRM(&omask);
|
|
pid = 0;
|
|
#ifdef INETD_BUILTINS_ENABLED
|
|
/* do we need to fork? */
|
|
if (sep->se_builtin == NULL
|
|
|| (sep->se_socktype == SOCK_STREAM
|
|
&& sep->se_builtin->bi_fork))
|
|
#endif
|
|
{
|
|
if (sep->se_max != 0) {
|
|
if (++sep->se_count == 1)
|
|
sep->se_time = monotonic_sec();
|
|
else if (sep->se_count >= sep->se_max) {
|
|
unsigned now = monotonic_sec();
|
|
/* did we accumulate se_max connects too quickly? */
|
|
if (now - sep->se_time <= CNT_INTERVAL) {
|
|
bb_error_msg("%s/%s: too many connections, pausing",
|
|
sep->se_service, sep->se_proto);
|
|
remove_fd_from_set(sep->se_fd);
|
|
close(sep->se_fd);
|
|
sep->se_fd = -1;
|
|
sep->se_count = 0;
|
|
rearm_alarm(); /* will revive it in RETRYTIME sec */
|
|
restore_sigmask(&omask);
|
|
maybe_close(accepted_fd);
|
|
continue; /* -> check next fd in fd set */
|
|
}
|
|
sep->se_count = 0;
|
|
}
|
|
}
|
|
/* on NOMMU, streamed chargen
|
|
* builtin wouldn't work, but it is
|
|
* not allowed on NOMMU (ifdefed out) */
|
|
#ifdef INETD_BUILTINS_ENABLED
|
|
if (BB_MMU && sep->se_builtin)
|
|
pid = fork();
|
|
else
|
|
#endif
|
|
pid = vfork();
|
|
|
|
if (pid < 0) { /* fork error */
|
|
bb_perror_msg("vfork"+1);
|
|
sleep(1);
|
|
restore_sigmask(&omask);
|
|
maybe_close(accepted_fd);
|
|
continue; /* -> check next fd in fd set */
|
|
}
|
|
if (pid == 0)
|
|
pid--; /* -1: "we did fork and we are child" */
|
|
}
|
|
/* if pid == 0 here, we never forked */
|
|
|
|
if (pid > 0) { /* parent */
|
|
if (sep->se_wait) {
|
|
/* tcp wait: we passed listening socket to child,
|
|
* will wait for child to terminate */
|
|
sep->se_wait = pid;
|
|
remove_fd_from_set(sep->se_fd);
|
|
}
|
|
if (new_udp_fd >= 0) {
|
|
/* udp nowait: child connected the socket,
|
|
* we created and will use new, unconnected one */
|
|
xmove_fd(new_udp_fd, sep->se_fd);
|
|
}
|
|
restore_sigmask(&omask);
|
|
maybe_close(accepted_fd);
|
|
continue; /* -> check next fd in fd set */
|
|
}
|
|
|
|
/* we are either child or didn't vfork at all */
|
|
#ifdef INETD_BUILTINS_ENABLED
|
|
if (sep->se_builtin) {
|
|
if (pid) { /* "pid" is -1: we did vfork */
|
|
close(sep->se_fd); /* listening socket */
|
|
logmode = LOGMODE_NONE; /* make xwrite etc silent */
|
|
}
|
|
restore_sigmask(&omask);
|
|
if (sep->se_socktype == SOCK_STREAM)
|
|
sep->se_builtin->bi_stream_fn(ctrl, sep);
|
|
else
|
|
sep->se_builtin->bi_dgram_fn(ctrl, sep);
|
|
if (pid) /* we did vfork */
|
|
_exit(EXIT_FAILURE);
|
|
maybe_close(accepted_fd);
|
|
continue; /* -> check next fd in fd set */
|
|
}
|
|
#endif
|
|
/* child */
|
|
setsid();
|
|
/* "nowait" udp */
|
|
if (new_udp_fd >= 0) {
|
|
len_and_sockaddr *lsa = xzalloc_lsa(sep->se_family);
|
|
/* peek at the packet and remember peer addr */
|
|
int r = recvfrom(ctrl, NULL, 0, MSG_PEEK|MSG_DONTWAIT,
|
|
&lsa->u.sa, &lsa->len);
|
|
if (r < 0)
|
|
goto do_exit1;
|
|
/* make this socket "connected" to peer addr:
|
|
* only packets from this peer will be recv'ed,
|
|
* and bare write()/send() will work on it */
|
|
connect(ctrl, &lsa->u.sa, lsa->len);
|
|
free(lsa);
|
|
}
|
|
/* prepare env and exec program */
|
|
pwd = getpwnam(sep->se_user);
|
|
if (pwd == NULL) {
|
|
bb_error_msg("%s: no such %s", sep->se_user, "user");
|
|
goto do_exit1;
|
|
}
|
|
if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
|
|
bb_error_msg("%s: no such %s", sep->se_group, "group");
|
|
goto do_exit1;
|
|
}
|
|
if (real_uid != 0 && real_uid != pwd->pw_uid) {
|
|
/* a user running private inetd */
|
|
bb_error_msg("non-root must run services as himself");
|
|
goto do_exit1;
|
|
}
|
|
if (pwd->pw_uid) {
|
|
if (sep->se_group)
|
|
pwd->pw_gid = grp->gr_gid;
|
|
/* initgroups, setgid, setuid: */
|
|
change_identity(pwd);
|
|
} else if (sep->se_group) {
|
|
xsetgid(grp->gr_gid);
|
|
setgroups(1, &grp->gr_gid);
|
|
}
|
|
if (rlim_ofile.rlim_cur != rlim_ofile_cur)
|
|
if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
|
|
bb_perror_msg("setrlimit");
|
|
|
|
/* closelog(); - WRONG. we are after vfork,
|
|
* this may confuse syslog() internal state.
|
|
* Let's hope libc sets syslog fd to CLOEXEC...
|
|
*/
|
|
xmove_fd(ctrl, STDIN_FILENO);
|
|
xdup2(STDIN_FILENO, STDOUT_FILENO);
|
|
/* manpages of inetd I managed to find either say
|
|
* that stderr is also redirected to the network,
|
|
* or do not talk about redirection at all (!) */
|
|
if (!sep->se_wait) /* only for usual "tcp nowait" */
|
|
xdup2(STDIN_FILENO, STDERR_FILENO);
|
|
/* NB: among others, this loop closes listening sockets
|
|
* for nowait stream children */
|
|
for (sep2 = serv_list; sep2; sep2 = sep2->se_next)
|
|
if (sep2->se_fd != ctrl)
|
|
maybe_close(sep2->se_fd);
|
|
sigaction_set(SIGPIPE, &saved_pipe_handler);
|
|
restore_sigmask(&omask);
|
|
BB_EXECVP(sep->se_program, sep->se_argv);
|
|
bb_perror_msg("can't execute '%s'", sep->se_program);
|
|
do_exit1:
|
|
/* eat packet in udp case */
|
|
if (sep->se_socktype != SOCK_STREAM)
|
|
recv(0, line, LINE_SIZE, MSG_DONTWAIT);
|
|
_exit(EXIT_FAILURE);
|
|
} /* for (sep = servtab...) */
|
|
} /* for (;;) */
|
|
}
|
|
|
|
#if !BB_MMU
|
|
static const char *const cat_args[] = { "cat", NULL };
|
|
#endif
|
|
|
|
/*
|
|
* Internet services provided internally by inetd:
|
|
*/
|
|
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
|
|
/* Echo service -- echo data back. */
|
|
/* ARGSUSED */
|
|
static void FAST_FUNC echo_stream(int s, servtab_t *sep UNUSED_PARAM)
|
|
{
|
|
#if BB_MMU
|
|
while (1) {
|
|
ssize_t sz = safe_read(s, line, LINE_SIZE);
|
|
if (sz <= 0)
|
|
break;
|
|
xwrite(s, line, sz);
|
|
}
|
|
#else
|
|
/* We are after vfork here! */
|
|
/* move network socket to stdin/stdout */
|
|
xmove_fd(s, STDIN_FILENO);
|
|
xdup2(STDIN_FILENO, STDOUT_FILENO);
|
|
/* no error messages please... */
|
|
close(STDERR_FILENO);
|
|
xopen(bb_dev_null, O_WRONLY);
|
|
BB_EXECVP("cat", (char**)cat_args);
|
|
/* on failure we return to main, which does exit(EXIT_FAILURE) */
|
|
#endif
|
|
}
|
|
static void FAST_FUNC echo_dg(int s, servtab_t *sep)
|
|
{
|
|
enum { BUFSIZE = 12*1024 }; /* for jumbo sized packets! :) */
|
|
char *buf = xmalloc(BUFSIZE); /* too big for stack */
|
|
int sz;
|
|
len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
|
|
|
|
lsa->len = sep->se_lsa->len;
|
|
/* dgram builtins are non-forking - DONT BLOCK! */
|
|
sz = recvfrom(s, buf, BUFSIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len);
|
|
if (sz > 0)
|
|
sendto(s, buf, sz, 0, &lsa->u.sa, lsa->len);
|
|
free(buf);
|
|
}
|
|
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
|
|
|
|
|
|
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
|
|
/* Discard service -- ignore data. */
|
|
/* ARGSUSED */
|
|
static void FAST_FUNC discard_stream(int s, servtab_t *sep UNUSED_PARAM)
|
|
{
|
|
#if BB_MMU
|
|
while (safe_read(s, line, LINE_SIZE) > 0)
|
|
continue;
|
|
#else
|
|
/* We are after vfork here! */
|
|
/* move network socket to stdin */
|
|
xmove_fd(s, STDIN_FILENO);
|
|
/* discard output */
|
|
close(STDOUT_FILENO);
|
|
xopen(bb_dev_null, O_WRONLY);
|
|
/* no error messages please... */
|
|
xdup2(STDOUT_FILENO, STDERR_FILENO);
|
|
BB_EXECVP("cat", (char**)cat_args);
|
|
/* on failure we return to main, which does exit(EXIT_FAILURE) */
|
|
#endif
|
|
}
|
|
/* ARGSUSED */
|
|
static void FAST_FUNC discard_dg(int s, servtab_t *sep UNUSED_PARAM)
|
|
{
|
|
/* dgram builtins are non-forking - DONT BLOCK! */
|
|
recv(s, line, LINE_SIZE, MSG_DONTWAIT);
|
|
}
|
|
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
|
|
|
|
|
|
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
|
|
#define LINESIZ 72
|
|
static void init_ring(void)
|
|
{
|
|
int i;
|
|
|
|
end_ring = ring;
|
|
for (i = ' '; i < 127; i++)
|
|
*end_ring++ = i;
|
|
}
|
|
/* Character generator. MMU arches only. */
|
|
/* ARGSUSED */
|
|
static void FAST_FUNC chargen_stream(int s, servtab_t *sep UNUSED_PARAM)
|
|
{
|
|
char *rs;
|
|
int len;
|
|
char text[LINESIZ + 2];
|
|
|
|
if (!end_ring) {
|
|
init_ring();
|
|
rs = ring;
|
|
}
|
|
|
|
text[LINESIZ] = '\r';
|
|
text[LINESIZ + 1] = '\n';
|
|
rs = ring;
|
|
for (;;) {
|
|
len = end_ring - rs;
|
|
if (len >= LINESIZ)
|
|
memmove(text, rs, LINESIZ);
|
|
else {
|
|
memmove(text, rs, len);
|
|
memmove(text + len, ring, LINESIZ - len);
|
|
}
|
|
if (++rs == end_ring)
|
|
rs = ring;
|
|
xwrite(s, text, sizeof(text));
|
|
}
|
|
}
|
|
/* ARGSUSED */
|
|
static void FAST_FUNC chargen_dg(int s, servtab_t *sep)
|
|
{
|
|
int len;
|
|
char text[LINESIZ + 2];
|
|
len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
|
|
|
|
/* Eat UDP packet which started it all */
|
|
/* dgram builtins are non-forking - DONT BLOCK! */
|
|
lsa->len = sep->se_lsa->len;
|
|
if (recvfrom(s, text, sizeof(text), MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
|
|
return;
|
|
|
|
if (!end_ring) {
|
|
init_ring();
|
|
ring_pos = ring;
|
|
}
|
|
|
|
len = end_ring - ring_pos;
|
|
if (len >= LINESIZ)
|
|
memmove(text, ring_pos, LINESIZ);
|
|
else {
|
|
memmove(text, ring_pos, len);
|
|
memmove(text + len, ring, LINESIZ - len);
|
|
}
|
|
if (++ring_pos == end_ring)
|
|
ring_pos = ring;
|
|
text[LINESIZ] = '\r';
|
|
text[LINESIZ + 1] = '\n';
|
|
sendto(s, text, sizeof(text), 0, &lsa->u.sa, lsa->len);
|
|
}
|
|
#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 uint32_t machtime(void)
|
|
{
|
|
struct timeval tv;
|
|
|
|
gettimeofday(&tv, NULL);
|
|
return htonl((uint32_t)(tv.tv_sec + 2208988800));
|
|
}
|
|
/* ARGSUSED */
|
|
static void FAST_FUNC machtime_stream(int s, servtab_t *sep UNUSED_PARAM)
|
|
{
|
|
uint32_t result;
|
|
|
|
result = machtime();
|
|
full_write(s, &result, sizeof(result));
|
|
}
|
|
static void FAST_FUNC machtime_dg(int s, servtab_t *sep)
|
|
{
|
|
uint32_t result;
|
|
len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
|
|
|
|
lsa->len = sep->se_lsa->len;
|
|
if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
|
|
return;
|
|
|
|
result = machtime();
|
|
sendto(s, &result, sizeof(result), 0, &lsa->u.sa, lsa->len);
|
|
}
|
|
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
|
|
|
|
|
|
#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
|
|
/* Return human-readable time of day */
|
|
/* ARGSUSED */
|
|
static void FAST_FUNC daytime_stream(int s, servtab_t *sep UNUSED_PARAM)
|
|
{
|
|
time_t t;
|
|
|
|
t = time(NULL);
|
|
fdprintf(s, "%.24s\r\n", ctime(&t));
|
|
}
|
|
static void FAST_FUNC daytime_dg(int s, servtab_t *sep)
|
|
{
|
|
time_t t;
|
|
len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
|
|
|
|
lsa->len = sep->se_lsa->len;
|
|
if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
|
|
return;
|
|
|
|
t = time(NULL);
|
|
sprintf(line, "%.24s\r\n", ctime(&t));
|
|
sendto(s, line, strlen(line), 0, &lsa->u.sa, lsa->len);
|
|
}
|
|
#endif /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */
|