1805 lines
46 KiB
C
1805 lines
46 KiB
C
/* $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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/*
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* Inetd - Internet super-server
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*
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* This program invokes all internet services as needed.
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* connection-oriented services are invoked each time a
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* connection is made, by creating a process. This process
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* is passed the connection as file descriptor 0 and is
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* expected to do a getpeername to find out the source host
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* and port.
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*
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* Datagram oriented services are invoked when a datagram
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* arrives; a process is created and passed a pending message
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* on file descriptor 0. Datagram servers may either connect
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* to their peer, freeing up the original socket for inetd
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* to receive further messages on, or ``take over the socket'',
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* processing all arriving datagrams and, eventually, timing
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* out. The first type of server is said to be ``multi-threaded'';
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* the second type of server ``single-threaded''.
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*
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* Inetd uses a configuration file which is read at startup
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* and, possibly, at some later time in response to a hangup signal.
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* The configuration file is ``free format'' with fields given in the
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* order shown below. Continuation lines for an entry must begin with
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* a space or tab. All fields must be present in each entry.
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*
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* service name must be in /etc/services
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* socket type stream/dgram/raw/rdm/seqpacket
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* protocol must be in /etc/protocols
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* wait/nowait[.max] single-threaded/multi-threaded, max #
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* user[.group] or user[:group] user/group to run daemon as
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* server program full path name
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* server program arguments maximum of MAXARGS (20)
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*
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* For RPC services
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* service name/version must be in /etc/rpc
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* socket type stream/dgram/raw/rdm/seqpacket
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* protocol must be in /etc/protocols
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* wait/nowait[.max] single-threaded/multi-threaded
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* user[.group] or user[:group] user to run daemon as
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* server program full path name
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* server program arguments maximum of MAXARGS (20)
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*
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* For non-RPC services, the "service name" can be of the form
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* hostaddress:servicename, in which case the hostaddress is used
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* as the host portion of the address to listen on. If hostaddress
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* consists of a single `*' character, INADDR_ANY is used.
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*
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* A line can also consist of just
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* hostaddress:
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* where hostaddress is as in the preceding paragraph. Such a line must
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* have no further fields; the specified hostaddress is remembered and
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* used for all further lines that have no hostaddress specified,
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* until the next such line (or EOF). (This is why * is provided to
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* allow explicit specification of INADDR_ANY.) A line
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* *:
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* is implicitly in effect at the beginning of the file.
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*
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* The hostaddress specifier may (and often will) contain dots;
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* the service name must not.
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*
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* For RPC services, host-address specifiers are accepted and will
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* work to some extent; however, because of limitations in the
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* portmapper interface, it will not work to try to give more than
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* one line for any given RPC service, even if the host-address
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* specifiers are different.
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*
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* Comment lines are indicated by a `#' in column 1.
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*/
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/*
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* Here's the scoop concerning the user[.:]group feature:
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*
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* 1) set-group-option off.
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*
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* a) user = root: NO setuid() or setgid() is done
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*
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* b) other: setgid(primary group as found in passwd)
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* initgroups(name, primary group)
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* setuid()
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*
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* 2) set-group-option on.
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*
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* a) user = root: setgid(specified group)
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* NO initgroups()
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* NO setuid()
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*
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* b) other: setgid(specified group)
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* initgroups(name, specified group)
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* setuid()
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*
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/file.h>
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#include <sys/wait.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <signal.h>
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#include <netdb.h>
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#include <syslog.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <ctype.h>
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#include <time.h>
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#include "busybox.h"
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//#define CONFIG_FEATURE_INETD_RPC
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//#define CONFIG_FEATURE_INETD_SUPPORT_BILTIN_ECHO
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//#define CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DISCARD
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//#define CONFIG_FEATURE_INETD_SUPPORT_BILTIN_TIME
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//#define CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DAYTIME
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//#define CONFIG_FEATURE_INETD_SUPPORT_BILTIN_CHARGEN
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//#define CONFIG_FEATURE_IPV6
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#ifdef CONFIG_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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#define _PATH_INETDCONF "/etc/inetd.conf"
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#define _PATH_INETDPID "/var/run/inetd.pid"
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#define TOOMANY 0 /* don't start more than TOOMANY */
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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 defined CONFIG_FEATURE_INETD_SUPPORT_BILTIN_ECHO || \
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defined CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DISCARD || \
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defined CONFIG_FEATURE_INETD_SUPPORT_BILTIN_TIME || \
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defined CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DAYTIME || \
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defined CONFIG_FEATURE_INETD_SUPPORT_BILTIN_CHARGEN
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# define INETD_FEATURE_ENABLED
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#endif
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#if defined CONFIG_FEATURE_INETD_SUPPORT_BILTIN_ECHO || \
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defined CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DISCARD || \
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defined CONFIG_FEATURE_INETD_SUPPORT_BILTIN_CHARGEN
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# define INETD_SETPROCTITLE
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#endif
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typedef struct servtab
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{
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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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#ifdef CONFIG_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 biltin *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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{
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struct sockaddr se_un_ctrladdr;
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struct sockaddr_in se_un_ctrladdr_in;
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#ifdef CONFIG_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 biltin
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{
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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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#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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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#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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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#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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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#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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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#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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 biltin biltins[] = {
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#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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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#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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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#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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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#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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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#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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 = 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 char *CONFIG = _PATH_INETDCONF;
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static FILE *fconfig;
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static char line[1024];
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static char *defhost;
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static char *newstr (char *cp)
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{
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if ((cp = strdup (cp ? cp : "")))
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return (cp);
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syslog (LOG_ERR, "strdup: %m");
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exit (1);
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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 = newstr ("*");
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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, "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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#ifdef CONFIG_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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syslog (LOG_ERR, "%s: getproto: %m", 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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syslog (LOG_ERR, "%s/%s: getsockname: %m",
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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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syslog (LOG_ERR, "%s %s: pmap_set: %u %u %u %u: %m",
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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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syslog (LOG_ERR, "pmap_unset(%u, %u)", sep->se_rpcprog, n);
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}
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}
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#endif /* CONFIG_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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syslog (LOG_ERR, "getrlimit: %m");
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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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syslog (LOG_ERR, "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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syslog (LOG_ERR, "setrlimit: %m");
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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 on = 1;
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int r;
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if ((sep->se_fd = socket (sep->se_family, sep->se_socktype, 0)) < 0) {
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syslog (LOG_ERR, "%s/%s: socket: %m", sep->se_service, sep->se_proto);
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return;
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}
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#define turnon(fd, opt) \
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setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
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if (turnon (sep->se_fd, SO_REUSEADDR) < 0)
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syslog (LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
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#undef turnon
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#ifdef CONFIG_FEATURE_INETD_RPC
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if (isrpcservice (sep)) {
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struct passwd *pwd;
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/*
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* for RPC services, attempt to use a reserved port
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* if they are going to be running as root.
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*
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* 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) {
|
|
syslog (LOG_ERR, "%s/%s (%d): bind: %m",
|
|
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)
|
|
{
|
|
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) */
|
|
/* syslog(LOG_ERR, "syntax error in inetd config file"); */
|
|
return (NULL);
|
|
}
|
|
|
|
again:
|
|
while (*cp == ' ' || *cp == '\t')
|
|
cp++;
|
|
if (*cp == '\0') {
|
|
int c;
|
|
|
|
c = getc (fconfig);
|
|
(void) ungetc (c, fconfig);
|
|
if (c == ' ' || c == '\t')
|
|
if ((cp = nextline ()))
|
|
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)
|
|
{
|
|
servtab_t *sep;
|
|
|
|
sep = (servtab_t *) malloc (sizeof (servtab_t));
|
|
if (sep == NULL) {
|
|
syslog (LOG_ERR, bb_msg_memory_exhausted);
|
|
exit (1);
|
|
}
|
|
return sep;
|
|
}
|
|
|
|
static servtab_t *dupconfig (servtab_t *sep)
|
|
{
|
|
servtab_t *newtab;
|
|
int argc;
|
|
|
|
newtab = new_servtab();
|
|
memset (newtab, 0, sizeof (servtab_t));
|
|
newtab->se_service = sep->se_service ? newstr (sep->se_service) : NULL;
|
|
newtab->se_socktype = sep->se_socktype;
|
|
newtab->se_family = sep->se_family;
|
|
newtab->se_proto = sep->se_proto ? newstr (sep->se_proto) : NULL;
|
|
#ifdef CONFIG_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 = sep->se_user ? newstr (sep->se_user) : NULL;
|
|
newtab->se_group = sep->se_group ? newstr (sep->se_group) : NULL;
|
|
#ifdef INETD_FEATURE_ENABLED
|
|
newtab->se_bi = sep->se_bi;
|
|
#endif
|
|
newtab->se_server = sep->se_server ? newstr (sep->se_server) : 0;
|
|
|
|
for (argc = 0; argc <= MAXARGV; argc++)
|
|
newtab->se_argv[argc] = sep->se_argv[argc] ?
|
|
newstr (sep->se_argv[argc]) : NULL;
|
|
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 == '#');
|
|
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 = newstr (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 = newstr (defhost);
|
|
|
|
sep->se_service = newstr (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 = newstr (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')
|
|
#ifdef CONFIG_FEATURE_IPV6
|
|
sep->se_family = AF_INET6;
|
|
#else
|
|
syslog (LOG_ERR, "%s: IPV6 not supported", sep->se_proto);
|
|
#endif
|
|
if (strncmp (sep->se_proto, "rpc/", 4) == 0) {
|
|
#ifdef CONFIG_FEATURE_INETD_RPC
|
|
char *p, *ccp;
|
|
long l;
|
|
|
|
p = strchr (sep->se_service, '/');
|
|
if (p == 0) {
|
|
syslog (LOG_ERR, "%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:
|
|
syslog (LOG_ERR, "%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
|
|
syslog (LOG_ERR, "%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 = atoi (s);
|
|
} else
|
|
sep->se_max = toomany;
|
|
}
|
|
sep->se_wait = strcmp (arg, "wait") == 0;
|
|
/* if ((arg = skip(&cp, 1)) == NULL) */
|
|
/* goto more; */
|
|
sep->se_user = newstr (skip (&cp));
|
|
arg = strchr (sep->se_user, '.');
|
|
if (arg == NULL)
|
|
arg = strchr (sep->se_user, ':');
|
|
if (arg) {
|
|
*arg++ = '\0';
|
|
sep->se_group = newstr (arg);
|
|
}
|
|
/* if ((arg = skip(&cp, 1)) == NULL) */
|
|
/* goto more; */
|
|
|
|
sep->se_server = newstr (skip (&cp));
|
|
if (strcmp (sep->se_server, "internal") == 0) {
|
|
#ifdef INETD_FEATURE_ENABLED
|
|
const struct biltin *bi;
|
|
|
|
for (bi = biltins; 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) {
|
|
syslog (LOG_ERR, "internal service %s unknown", sep->se_service);
|
|
goto more;
|
|
}
|
|
sep->se_bi = bi;
|
|
sep->se_wait = bi->bi_wait;
|
|
#else
|
|
syslog (LOG_ERR, "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++] = newstr (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 = newstr (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 (!strcmp (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) {
|
|
syslog (LOG_ERR, "%s: unknown host", nsep->se_hostaddr);
|
|
nsep->se_checked = 0;
|
|
goto skip;
|
|
} else if (hp->h_addrtype != AF_INET) {
|
|
syslog (LOG_ERR,
|
|
"%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 = newstr (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;
|
|
#ifdef CONFIG_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);
|
|
|
|
#ifdef CONFIG_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;
|
|
int add;
|
|
size_t n;
|
|
char protoname[10];
|
|
|
|
if (!setconfig ()) {
|
|
syslog (LOG_ERR, "%s: %m", CONFIG);
|
|
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;
|
|
add = 0;
|
|
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
|
|
|
|
#ifdef CONFIG_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);
|
|
add = 1;
|
|
} 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;
|
|
|
|
#ifdef CONFIG_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) {
|
|
syslog (LOG_ERR, "%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
|
|
{
|
|
u_short 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) {
|
|
syslog (LOG_ERR,
|
|
"%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;
|
|
#ifdef CONFIG_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;
|
|
|
|
#ifdef CONFIG_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) {
|
|
syslog (LOG_ERR, "%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
|
|
{
|
|
u_short 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) {
|
|
syslog (LOG_ERR,
|
|
"%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 /* CONFIG_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);
|
|
}
|
|
#ifdef CONFIG_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))
|
|
syslog (LOG_WARNING,
|
|
"%s: exit status 0x%x",
|
|
sep->se_server, WEXITSTATUS (status));
|
|
else if (WIFSIGNALED (status))
|
|
syslog (LOG_WARNING,
|
|
"%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:
|
|
#ifdef CONFIG_FEATURE_IPV6
|
|
case AF_INET6:
|
|
#endif
|
|
setup (sep);
|
|
#ifdef CONFIG_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:
|
|
#ifdef CONFIG_FEATURE_IPV6
|
|
case AF_INET6:
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_INETD_RPC
|
|
if (sep->se_wait == 1 && isrpcservice (sep))
|
|
unregister_rpc (sep); /* XXX signal race */
|
|
#endif
|
|
break;
|
|
}
|
|
(void) close (sep->se_fd);
|
|
}
|
|
(void) unlink (_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[])
|
|
{
|
|
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
|
|
extern char **environ;
|
|
char **envp = environ;
|
|
|
|
Argv = argv;
|
|
if (envp == 0 || *envp == 0)
|
|
envp = argv;
|
|
while (*envp)
|
|
envp++;
|
|
LastArg = envp[-1] + strlen (envp[-1]);
|
|
#endif
|
|
|
|
openlog (bb_applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
|
|
|
|
opt = bb_getopt_ulflags (argc, argv, "R:f", &stoomany);
|
|
if(opt & 1) {
|
|
char *e;
|
|
|
|
toomany = strtoul (stoomany, &e, 0);
|
|
if (!(toomany >= 0 && *e == '\0')) {
|
|
toomany = TOOMANY;
|
|
syslog (LOG_ERR, "-R %s: bad value for service invocation rate", stoomany);
|
|
}
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
uid = getuid ();
|
|
if (uid != 0)
|
|
CONFIG = NULL;
|
|
if (argc > 0)
|
|
CONFIG = argv[0];
|
|
if (CONFIG == NULL)
|
|
bb_error_msg_and_die ("non-root must specify a config file");
|
|
|
|
if (!(opt & 2)) {
|
|
#if defined(__uClinux__)
|
|
/* reexec for vfork() do continue parent */
|
|
vfork_daemon_rexec (0, 0, argc, argv, "-f");
|
|
#else
|
|
daemon (0, 0);
|
|
#endif /* uClinux */
|
|
} else {
|
|
setsid ();
|
|
}
|
|
|
|
if (uid == 0) {
|
|
gid_t gid = getgid ();
|
|
|
|
/* If run by hand, ensure groups vector gets trashed */
|
|
setgroups (1, &gid);
|
|
}
|
|
|
|
{
|
|
FILE *fp;
|
|
|
|
if ((fp = fopen (_PATH_INETDPID, "w")) != NULL) {
|
|
fprintf (fp, "%u\n", getpid ());
|
|
(void) fclose (fp);
|
|
}
|
|
}
|
|
|
|
if (getrlimit (RLIMIT_NOFILE, &rlim_ofile) < 0) {
|
|
syslog (LOG_ERR, "getrlimit: %m");
|
|
} 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);
|
|
/* doconfig(); */
|
|
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;
|
|
if ((n = select (maxsock + 1, &readable, NULL, NULL, NULL)) <= 0) {
|
|
if (n < 0 && errno != EINTR) {
|
|
syslog (LOG_WARNING, "select: %m");
|
|
sleep (1);
|
|
}
|
|
continue;
|
|
}
|
|
for (sep = servtab; n && sep; sep = sep->se_next)
|
|
if (sep->se_fd != -1 && FD_ISSET (sep->se_fd, &readable)) {
|
|
n--;
|
|
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) {
|
|
ctrl = accept (sep->se_fd, NULL, NULL);
|
|
if (ctrl < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
syslog (LOG_WARNING, "accept (for %s): %m", 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) {
|
|
syslog (LOG_WARNING, "could not 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;
|
|
}
|
|
syslog (LOG_ERR,
|
|
"%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) {
|
|
syslog (LOG_ERR, "fork: %m");
|
|
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
|
|
{
|
|
if ((pwd = getpwnam (sep->se_user)) == NULL) {
|
|
syslog (LOG_ERR, "getpwnam: %s: No such user", sep->se_user);
|
|
if (sep->se_socktype != SOCK_STREAM)
|
|
recv (0, buf, sizeof (buf), 0);
|
|
_exit (1);
|
|
}
|
|
if (setsid () < 0)
|
|
syslog (LOG_ERR, "%s: setsid: %m", sep->se_service);
|
|
if (sep->se_group && (grp = getgrnam (sep->se_group)) == NULL) {
|
|
syslog (LOG_ERR, "getgrnam: %s: No such group", sep->se_group);
|
|
if (sep->se_socktype != SOCK_STREAM)
|
|
recv (0, buf, sizeof (buf), 0);
|
|
_exit (1);
|
|
}
|
|
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;
|
|
}
|
|
setgid ((gid_t) pwd->pw_gid);
|
|
initgroups (pwd->pw_name, pwd->pw_gid);
|
|
setuid ((uid_t) pwd->pw_uid);
|
|
} else if (sep->se_group) {
|
|
setgid (grp->gr_gid);
|
|
setgroups (1, &grp->gr_gid);
|
|
}
|
|
dup2 (ctrl, 0);
|
|
close (ctrl);
|
|
dup2 (0, 1);
|
|
dup2 (0, 2);
|
|
if (rlim_ofile.rlim_cur != rlim_ofile_cur)
|
|
if (setrlimit (RLIMIT_NOFILE, &rlim_ofile) < 0)
|
|
syslog (LOG_ERR, "setrlimit: %m");
|
|
closelog ();
|
|
for (tmpint = rlim_ofile_cur - 1; --tmpint > 2;)
|
|
(void) close (tmpint);
|
|
sigaction (SIGPIPE, &sapipe, NULL);
|
|
execv (sep->se_server, sep->se_argv);
|
|
if (sep->se_socktype != SOCK_STREAM)
|
|
recv (0, buf, sizeof (buf), 0);
|
|
syslog (LOG_ERR, "execv %s: %m", sep->se_server);
|
|
_exit (1);
|
|
}
|
|
}
|
|
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
|
|
close (ctrl);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Internet services provided internally by inetd:
|
|
*/
|
|
#define BUFSIZE 4096
|
|
|
|
#if defined(CONFIG_FEATURE_INETD_SUPPORT_BILTIN_ECHO) || \
|
|
defined(CONFIG_FEATURE_INETD_SUPPORT_BILTIN_CHARGEN) || \
|
|
defined(CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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
|
|
|
|
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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 ((i = read (s, buffer, sizeof (buffer))) > 0 &&
|
|
write (s, buffer, i) > 0);
|
|
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);
|
|
if ((i = recvfrom (s, buffer, sizeof (buffer), 0, &sa, &size)) < 0)
|
|
return;
|
|
if (dg_badinput ((struct sockaddr_in *) &sa))
|
|
return;
|
|
(void) sendto (s, buffer, i, 0, &sa, sizeof (sa));
|
|
}
|
|
#endif /* CONFIG_FEATURE_INETD_SUPPORT_BILTIN_ECHO */
|
|
|
|
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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 ((errno = 0, 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 /* CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DISCARD */
|
|
|
|
|
|
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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';
|
|
for (rs = ring;;) {
|
|
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;
|
|
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 /* CONFIG_FEATURE_INETD_SUPPORT_BILTIN_CHARGEN */
|
|
|
|
|
|
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_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 u_int machtime (void)
|
|
{
|
|
struct timeval tv;
|
|
|
|
if (gettimeofday (&tv, NULL) < 0) {
|
|
fprintf (stderr, "Unable to get time of day\n");
|
|
return (0L);
|
|
}
|
|
return (htonl ((u_int) tv.tv_sec + 2208988800UL));
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
machtime_stream (int s, servtab_t *sep ATTRIBUTE_UNUSED)
|
|
{
|
|
u_int result;
|
|
|
|
result = machtime ();
|
|
(void) write (s, (char *) &result, sizeof (result));
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
machtime_dg (int s, servtab_t *sep ATTRIBUTE_UNUSED)
|
|
{
|
|
u_int 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 /* CONFIG_FEATURE_INETD_SUPPORT_BILTIN_TIME */
|
|
|
|
|
|
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DAYTIME
|
|
/* Return human-readable time of day */
|
|
/* ARGSUSED */
|
|
static void daytime_stream (int s, servtab_t *sep ATTRIBUTE_UNUSED)
|
|
{
|
|
char buffer[256];
|
|
time_t t;
|
|
|
|
t = time (NULL);
|
|
|
|
(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 ((time_t *) 0);
|
|
|
|
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 /* CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DAYTIME */
|