1697 lines
41 KiB
C
1697 lines
41 KiB
C
/*
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* Copyright (c) 1983, 1991, 1993, 1994
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* The Regents of the University of California. 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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#ifndef lint
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static char copyright[] __attribute__ ((unused)) =
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"@(#) Copyright (c) 1983, 1991, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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/* from: @(#)inetd.c 8.4 (Berkeley) 4/13/94"; */
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static char inetd_c_rcsid[] __attribute__ ((unused)) =
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"$Id: inetd.c,v 1.21 1997/02/22 16:05:52 peter Exp $";
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#endif /* not lint */
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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. Connection-oriented
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* services are invoked each time a connection is made, by creating a process.
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* This process is passed the connection as file descriptor 0 and is expected
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* to do a getpeername to find out the source host 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 being 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 or must
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* name a tcpmux service
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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 single-threaded/multi-threaded
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* user 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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* TCP services without official port numbers are handled with the
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* RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
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* requests. When a connection is made from a foreign host, the service
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* requested is passed to tcpmux, which looks it up in the servtab list
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* and returns the proper entry for the service. Tcpmux returns a
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* negative reply if the service doesn't exist, otherwise the invoked
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* server is expected to return the positive reply if the service type in
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* inetd.conf file has the prefix "tcpmux/". If the service type has the
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* prefix "tcpmux/+", tcpmux will return the positive reply for the
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* process; this is for compatibility with older server code, and also
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* allows you to invoke programs that use stdin/stdout without putting any
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* special server code in them. Services that use tcpmux are "nowait"
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* because they do not have a well-known port and hence cannot listen
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* for new requests.
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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 single-threaded/multi-threaded
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* user user to run daemon as
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* server program full path name
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* server program arguments maximum of MAXARGS
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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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#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/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 <rpc/rpc.h>
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#include <rpc/pmap_clnt.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <libutil.h>
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#include <sysexits.h>
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#ifdef LOGIN_CAP
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#undef AUTH_NONE /* conflicts with rpc stuff */
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#include <login_cap.h>
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#endif
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#include "pathnames.h"
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#define TOOMANY 256 /* 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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#define MAX_MAXCHLD 32767 /* max allowable max children */
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#define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
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int debug = 0;
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int log = 0;
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int nsock, maxsock;
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fd_set allsock;
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int options;
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int timingout;
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int toomany = TOOMANY;
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struct servent *sp;
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struct rpcent *rpc;
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struct in_addr bind_address;
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struct servtab {
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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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char *se_proto; /* protocol used */
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short se_maxchild; /* max number of children */
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short se_numchild; /* current number of children */
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pid_t *se_pids; /* array of child pids */
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char *se_user; /* user name to run as */
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struct biltin *se_bi; /* if built-in, description */
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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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struct sockaddr_in se_ctrladdr;/* bound address */
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u_char se_type; /* type: normal, mux, or mux+ */
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u_char se_checked; /* looked at during merge */
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u_char se_accept; /* i.e., wait/nowait mode */
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u_char se_rpc; /* ==1 if RPC service */
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int se_rpc_prog; /* RPC program number */
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u_int se_rpc_lowvers; /* RPC low version */
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u_int se_rpc_highvers; /* RPC high version */
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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;
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#define NORM_TYPE 0
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#define MUX_TYPE 1
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#define MUXPLUS_TYPE 2
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#define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \
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((sep)->se_type == MUXPLUS_TYPE))
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#define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE)
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void chargen_dg __P((int, struct servtab *));
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void chargen_stream __P((int, struct servtab *));
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void close_sep __P((struct servtab *));
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void config __P((int));
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void daytime_dg __P((int, struct servtab *));
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void daytime_stream __P((int, struct servtab *));
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void discard_dg __P((int, struct servtab *));
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void discard_stream __P((int, struct servtab *));
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void echo_dg __P((int, struct servtab *));
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void echo_stream __P((int, struct servtab *));
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void endconfig __P((void));
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struct servtab *enter __P((struct servtab *));
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void freeconfig __P((struct servtab *));
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struct servtab *getconfigent __P((void));
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void machtime_dg __P((int, struct servtab *));
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void machtime_stream __P((int, struct servtab *));
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char *newstr __P((char *));
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char *nextline __P((FILE *));
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void print_service __P((char *, struct servtab *));
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void addchild __P((struct servtab *, int));
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void reapchild __P((int));
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void enable __P((struct servtab *));
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void disable __P((struct servtab *));
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void retry __P((int));
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int setconfig __P((void));
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void setup __P((struct servtab *));
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char *sskip __P((char **));
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char *skip __P((char **));
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struct servtab *tcpmux __P((int));
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void unregisterrpc __P((register struct servtab *sep));
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struct biltin {
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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_maxchild; /* max number of children (default) */
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void (*bi_fn)(); /* function which performs it */
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} biltins[] = {
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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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/* 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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/* Return 32 bit time since 1970 */
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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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/* 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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/* 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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{ "tcpmux", SOCK_STREAM, 1, 0, (void (*)())tcpmux },
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{ NULL }
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};
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#define NUMINT (sizeof(intab) / sizeof(struct inent))
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char *CONFIG = _PATH_INETDCONF;
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char *pid_file = _PATH_INETDPID;
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#ifdef OLD_SETPROCTITLE
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char **Argv;
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char *LastArg;
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#endif
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int
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main(argc, argv, envp)
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int argc;
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char *argv[], *envp[];
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{
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struct servtab *sep;
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struct passwd *pwd;
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struct sigvec sv;
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int tmpint, ch, dofork;
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pid_t pid;
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char buf[50];
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struct sockaddr_in peer;
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int i;
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#ifdef LOGIN_CAP
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login_cap_t *lc = NULL;
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#endif
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#ifdef OLD_SETPROCTITLE
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Argv = argv;
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if (envp == 0 || *envp == 0)
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envp = argv;
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while (*envp)
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envp++;
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LastArg = envp[-1] + strlen(envp[-1]);
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#endif
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openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
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bind_address.s_addr = htonl(INADDR_ANY);
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while ((ch = getopt(argc, argv, "dlR:a:p:")) != -1)
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switch(ch) {
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case 'd':
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debug = 1;
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options |= SO_DEBUG;
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break;
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case 'l':
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log = 1;
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break;
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case 'R': { /* invocation rate */
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char *p;
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tmpint = strtol(optarg, &p, 0);
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if (tmpint < 1 || *p)
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syslog(LOG_ERR,
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"-R %s: bad value for service invocation rate",
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optarg);
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else
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toomany = tmpint;
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break;
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}
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case 'a':
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if (!inet_aton(optarg, &bind_address)) {
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syslog(LOG_ERR,
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"-a %s: invalid IP address", optarg);
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exit(EX_USAGE);
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}
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break;
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case 'p':
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pid_file = optarg;
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break;
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case '?':
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default:
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syslog(LOG_ERR,
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"usage: inetd [-dl] [-a address] [-R rate]"
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" [-p pidfile] [conf-file]");
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exit(EX_USAGE);
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}
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argc -= optind;
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argv += optind;
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if (argc > 0)
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CONFIG = argv[0];
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if (debug == 0) {
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FILE *fp;
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if (daemon(0, 0) < 0) {
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syslog(LOG_WARNING, "daemon(0,0) failed: %m");
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}
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/*
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* In case somebody has started inetd manually, we need to
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* clear the logname, so that old servers run as root do not
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* get the user's logname..
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*/
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if (setlogin("") < 0) {
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syslog(LOG_WARNING, "cannot clear logname: %m");
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/* no big deal if it fails.. */
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}
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pid = getpid();
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fp = fopen(pid_file, "w");
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if (fp) {
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fprintf(fp, "%ld\n", (long)pid);
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fclose(fp);
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} else {
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syslog(LOG_WARNING, "%s: %m", pid_file);
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}
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}
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memset(&sv, 0, sizeof(sv));
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sv.sv_mask = SIGBLOCK;
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sv.sv_handler = retry;
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sigvec(SIGALRM, &sv, (struct sigvec *)0);
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config(SIGHUP);
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sv.sv_handler = config;
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sigvec(SIGHUP, &sv, (struct sigvec *)0);
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sv.sv_handler = reapchild;
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sigvec(SIGCHLD, &sv, (struct sigvec *)0);
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{
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/* space for daemons to overwrite environment for ps */
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#define DUMMYSIZE 100
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char dummy[DUMMYSIZE];
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(void)memset(dummy, 'x', DUMMYSIZE - 1);
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dummy[DUMMYSIZE - 1] = '\0';
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(void)setenv("inetd_dummy", dummy, 1);
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}
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for (;;) {
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int n, ctrl;
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fd_set readable;
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if (nsock == 0) {
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(void) sigblock(SIGBLOCK);
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while (nsock == 0)
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sigpause(0L);
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(void) sigsetmask(0L);
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}
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readable = allsock;
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if ((n = select(maxsock + 1, &readable, (fd_set *)0,
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(fd_set *)0, (struct timeval *)0)) <= 0) {
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if (n < 0 && errno != EINTR)
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syslog(LOG_WARNING, "select: %m");
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sleep(1);
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continue;
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}
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for (sep = servtab; n && sep; sep = sep->se_next)
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if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
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n--;
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if (debug)
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fprintf(stderr, "someone wants %s\n",
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sep->se_service);
|
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if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
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ctrl = accept(sep->se_fd, (struct sockaddr *)0,
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(int *)0);
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if (debug)
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fprintf(stderr, "accept, ctrl %d\n", ctrl);
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if (ctrl < 0) {
|
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if (errno != EINTR)
|
|
syslog(LOG_WARNING,
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"accept (for %s): %m",
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sep->se_service);
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continue;
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}
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if (log) {
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i = sizeof peer;
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|
if(getpeername(ctrl, (struct sockaddr *)
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&peer, &i)) {
|
|
syslog(LOG_WARNING,
|
|
"getpeername(for %s): %m",
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sep->se_service);
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continue;
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}
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|
syslog(LOG_INFO,"%s from %s",
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sep->se_service,
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inet_ntoa(peer.sin_addr));
|
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}
|
|
/*
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* Call tcpmux to find the real service to exec.
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|
*/
|
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if (sep->se_bi &&
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sep->se_bi->bi_fn == (void (*)()) tcpmux) {
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struct servtab *tsep;
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|
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tsep = tcpmux(ctrl);
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if (tsep == NULL) {
|
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close(ctrl);
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continue;
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}
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|
sep = tsep;
|
|
}
|
|
} else
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|
ctrl = sep->se_fd;
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(void) sigblock(SIGBLOCK);
|
|
pid = 0;
|
|
dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork);
|
|
if (dofork) {
|
|
if (sep->se_count++ == 0)
|
|
(void)gettimeofday(&sep->se_time,
|
|
(struct timezone *)0);
|
|
else if (sep->se_count >= toomany) {
|
|
struct timeval now;
|
|
|
|
(void)gettimeofday(&now, (struct timezone *)0);
|
|
if (now.tv_sec - sep->se_time.tv_sec >
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CNT_INTVL) {
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sep->se_time = now;
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sep->se_count = 1;
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} else {
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|
syslog(LOG_ERR,
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"%s/%s server failing (looping), service terminated",
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sep->se_service, sep->se_proto);
|
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close_sep(sep);
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sigsetmask(0L);
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|
if (!timingout) {
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timingout = 1;
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alarm(RETRYTIME);
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|
}
|
|
continue;
|
|
}
|
|
}
|
|
pid = fork();
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|
}
|
|
if (pid < 0) {
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|
syslog(LOG_ERR, "fork: %m");
|
|
if (sep->se_accept &&
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sep->se_socktype == SOCK_STREAM)
|
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close(ctrl);
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|
sigsetmask(0L);
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sleep(1);
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continue;
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}
|
|
if (pid)
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|
addchild(sep, pid);
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|
sigsetmask(0L);
|
|
if (pid == 0) {
|
|
if (dofork) {
|
|
if (debug)
|
|
fprintf(stderr, "+ Closing from %d\n",
|
|
maxsock);
|
|
for (tmpint = maxsock; tmpint > 2; tmpint--)
|
|
if (tmpint != ctrl)
|
|
(void) close(tmpint);
|
|
}
|
|
if (sep->se_bi) {
|
|
(*sep->se_bi->bi_fn)(ctrl, sep);
|
|
/* NOTREACHED */
|
|
} else {
|
|
if (debug)
|
|
fprintf(stderr, "%d execl %s\n",
|
|
getpid(), sep->se_server);
|
|
dup2(ctrl, 0);
|
|
close(ctrl);
|
|
dup2(0, 1);
|
|
dup2(0, 2);
|
|
if ((pwd = getpwnam(sep->se_user)) == NULL) {
|
|
syslog(LOG_ERR,
|
|
"%s/%s: %s: No such user",
|
|
sep->se_service, sep->se_proto,
|
|
sep->se_user);
|
|
if (sep->se_socktype != SOCK_STREAM)
|
|
recv(0, buf, sizeof (buf), 0);
|
|
_exit(EX_NOUSER);
|
|
}
|
|
#ifdef LOGIN_CAP
|
|
/*
|
|
* Establish the class now, falls back to
|
|
* the "default" if unavailable.
|
|
*/
|
|
lc = login_getclass(pwd);
|
|
#endif
|
|
if (setsid() < 0) {
|
|
syslog(LOG_ERR,
|
|
"%s: can't setsid(): %m",
|
|
sep->se_service);
|
|
/* _exit(EX_OSERR); not fatal yet */
|
|
}
|
|
#ifdef LOGIN_CAP
|
|
if (setusercontext(lc, pwd, pwd->pw_uid,
|
|
LOGIN_SETALL) != 0) {
|
|
syslog(LOG_ERR,
|
|
"%s: can't setusercontext(..%s..): %m",
|
|
sep->se_service, sep->se_user);
|
|
_exit(EX_OSERR);
|
|
}
|
|
#else
|
|
if (pwd->pw_uid) {
|
|
if (setlogin(sep->se_user) < 0) {
|
|
syslog(LOG_ERR,
|
|
"%s: can't setlogin(%s): %m",
|
|
sep->se_service, sep->se_user);
|
|
/* _exit(EX_OSERR); not yet */
|
|
}
|
|
if (setgid(pwd->pw_gid) < 0) {
|
|
syslog(LOG_ERR,
|
|
"%s: can't set gid %d: %m",
|
|
sep->se_service, pwd->pw_gid);
|
|
_exit(EX_OSERR);
|
|
}
|
|
(void) initgroups(pwd->pw_name,
|
|
pwd->pw_gid);
|
|
if (setuid(pwd->pw_uid) < 0) {
|
|
syslog(LOG_ERR,
|
|
"%s: can't set uid %d: %m",
|
|
sep->se_service, pwd->pw_uid);
|
|
_exit(EX_OSERR);
|
|
}
|
|
}
|
|
#endif
|
|
execv(sep->se_server, sep->se_argv);
|
|
if (sep->se_socktype != SOCK_STREAM)
|
|
recv(0, buf, sizeof (buf), 0);
|
|
syslog(LOG_ERR,
|
|
"cannot execute %s: %m", sep->se_server);
|
|
_exit(EX_OSERR);
|
|
}
|
|
}
|
|
if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
|
|
close(ctrl);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Record a new child pid for this service. If we've reached the
|
|
* limit on children, then stop accepting incoming requests.
|
|
*/
|
|
|
|
void
|
|
addchild(struct servtab *sep, pid_t pid)
|
|
{
|
|
#ifdef SANITY_CHECK
|
|
if (sep->se_numchild >= sep->se_maxchild) {
|
|
syslog(LOG_ERR, "%s: %d >= %d",
|
|
__FUNCTION__, sep->se_numchild, sep->se_maxchild);
|
|
exit(EX_SOFTWARE);
|
|
}
|
|
#endif
|
|
if (sep->se_maxchild == 0)
|
|
return;
|
|
sep->se_pids[sep->se_numchild++] = pid;
|
|
if (sep->se_numchild == sep->se_maxchild)
|
|
disable(sep);
|
|
}
|
|
|
|
/*
|
|
* Some child process has exited. See if it's on somebody's list.
|
|
*/
|
|
|
|
void
|
|
reapchild(signo)
|
|
int signo;
|
|
{
|
|
int k, status;
|
|
pid_t pid;
|
|
struct servtab *sep;
|
|
|
|
for (;;) {
|
|
pid = wait3(&status, WNOHANG, (struct rusage *)0);
|
|
if (pid <= 0)
|
|
break;
|
|
if (debug)
|
|
fprintf(stderr, "%d reaped, status %#x\n",
|
|
pid, status);
|
|
for (sep = servtab; sep; sep = sep->se_next) {
|
|
for (k = 0; k < sep->se_numchild; k++)
|
|
if (sep->se_pids[k] == pid)
|
|
break;
|
|
if (k == sep->se_numchild)
|
|
continue;
|
|
if (sep->se_numchild == sep->se_maxchild)
|
|
enable(sep);
|
|
sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
|
|
if (status)
|
|
syslog(LOG_WARNING,
|
|
"%s[%d]: exit status 0x%x",
|
|
sep->se_server, pid, status);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
config(signo)
|
|
int signo;
|
|
{
|
|
struct servtab *sep, *new, **sepp;
|
|
struct passwd *pwd;
|
|
long omask;
|
|
|
|
if (!setconfig()) {
|
|
syslog(LOG_ERR, "%s: %m", CONFIG);
|
|
return;
|
|
}
|
|
for (sep = servtab; sep; sep = sep->se_next)
|
|
sep->se_checked = 0;
|
|
while ((new = getconfigent())) {
|
|
if ((pwd = getpwnam(new->se_user)) == NULL) {
|
|
syslog(LOG_ERR,
|
|
"%s/%s: No such user '%s', service ignored",
|
|
new->se_service, new->se_proto, new->se_user);
|
|
continue;
|
|
}
|
|
for (sep = servtab; sep; sep = sep->se_next)
|
|
if (strcmp(sep->se_service, new->se_service) == 0 &&
|
|
strcmp(sep->se_proto, new->se_proto) == 0)
|
|
break;
|
|
if (sep != 0) {
|
|
int i;
|
|
|
|
#define SWAP(a, b) { typeof(a) c = a; a = b; b = c; }
|
|
omask = sigblock(SIGBLOCK);
|
|
/* copy over outstanding child pids */
|
|
if (sep->se_maxchild && new->se_maxchild) {
|
|
new->se_numchild = sep->se_numchild;
|
|
if (new->se_numchild > new->se_maxchild)
|
|
new->se_numchild = new->se_maxchild;
|
|
memcpy(new->se_pids, sep->se_pids,
|
|
new->se_numchild * sizeof(*new->se_pids));
|
|
}
|
|
SWAP(sep->se_pids, new->se_pids);
|
|
sep->se_maxchild = new->se_maxchild;
|
|
sep->se_numchild = new->se_numchild;
|
|
/* might need to turn on or off service now */
|
|
if (sep->se_fd >= 0) {
|
|
if (sep->se_maxchild
|
|
&& sep->se_numchild == sep->se_maxchild) {
|
|
if (FD_ISSET(sep->se_fd, &allsock))
|
|
disable(sep);
|
|
} else {
|
|
if (!FD_ISSET(sep->se_fd, &allsock))
|
|
enable(sep);
|
|
}
|
|
}
|
|
sep->se_accept = new->se_accept;
|
|
if (new->se_user)
|
|
SWAP(sep->se_user, new->se_user);
|
|
if (new->se_server)
|
|
SWAP(sep->se_server, new->se_server);
|
|
for (i = 0; i < MAXARGV; i++)
|
|
SWAP(sep->se_argv[i], new->se_argv[i]);
|
|
sigsetmask(omask);
|
|
freeconfig(new);
|
|
if (debug)
|
|
print_service("REDO", sep);
|
|
} else {
|
|
sep = enter(new);
|
|
if (debug)
|
|
print_service("ADD ", sep);
|
|
}
|
|
sep->se_checked = 1;
|
|
if (ISMUX(sep)) {
|
|
sep->se_fd = -1;
|
|
continue;
|
|
}
|
|
if (!sep->se_rpc) {
|
|
sp = getservbyname(sep->se_service, sep->se_proto);
|
|
if (sp == 0) {
|
|
syslog(LOG_ERR, "%s/%s: unknown service",
|
|
sep->se_service, sep->se_proto);
|
|
sep->se_checked = 0;
|
|
continue;
|
|
}
|
|
if (sp->s_port != sep->se_ctrladdr.sin_port) {
|
|
sep->se_ctrladdr.sin_family = AF_INET;
|
|
sep->se_ctrladdr.sin_addr = bind_address;
|
|
sep->se_ctrladdr.sin_port = sp->s_port;
|
|
if (sep->se_fd >= 0)
|
|
close_sep(sep);
|
|
}
|
|
} else {
|
|
rpc = getrpcbyname(sep->se_service);
|
|
if (rpc == 0) {
|
|
syslog(LOG_ERR, "%s/%s unknown RPC service.",
|
|
sep->se_service, sep->se_proto);
|
|
if (sep->se_fd != -1)
|
|
(void) close(sep->se_fd);
|
|
sep->se_fd = -1;
|
|
continue;
|
|
}
|
|
if (rpc->r_number != sep->se_rpc_prog) {
|
|
if (sep->se_rpc_prog)
|
|
unregisterrpc(sep);
|
|
sep->se_rpc_prog = rpc->r_number;
|
|
if (sep->se_fd != -1)
|
|
(void) close(sep->se_fd);
|
|
sep->se_fd = -1;
|
|
}
|
|
}
|
|
if (sep->se_fd == -1)
|
|
setup(sep);
|
|
}
|
|
endconfig();
|
|
/*
|
|
* Purge anything not looked at above.
|
|
*/
|
|
omask = sigblock(SIGBLOCK);
|
|
sepp = &servtab;
|
|
while ((sep = *sepp)) {
|
|
if (sep->se_checked) {
|
|
sepp = &sep->se_next;
|
|
continue;
|
|
}
|
|
*sepp = sep->se_next;
|
|
if (sep->se_fd >= 0)
|
|
close_sep(sep);
|
|
if (debug)
|
|
print_service("FREE", sep);
|
|
if (sep->se_rpc && sep->se_rpc_prog > 0)
|
|
unregisterrpc(sep);
|
|
freeconfig(sep);
|
|
free((char *)sep);
|
|
}
|
|
(void) sigsetmask(omask);
|
|
}
|
|
|
|
void
|
|
unregisterrpc(sep)
|
|
struct servtab *sep;
|
|
{
|
|
int i;
|
|
struct servtab *sepp;
|
|
long omask;
|
|
|
|
omask = sigblock(SIGBLOCK);
|
|
for (sepp = servtab; sepp; sepp = sepp->se_next) {
|
|
if (sepp == sep)
|
|
continue;
|
|
if (sep->se_checked == 0 ||
|
|
!sepp->se_rpc ||
|
|
sep->se_rpc_prog != sepp->se_rpc_prog)
|
|
continue;
|
|
return;
|
|
}
|
|
if (debug)
|
|
print_service("UNREG", sep);
|
|
for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++)
|
|
pmap_unset(sep->se_rpc_prog, i);
|
|
if (sep->se_fd != -1)
|
|
(void) close(sep->se_fd);
|
|
sep->se_fd = -1;
|
|
(void) sigsetmask(omask);
|
|
}
|
|
|
|
void
|
|
retry(signo)
|
|
int signo;
|
|
{
|
|
struct servtab *sep;
|
|
|
|
timingout = 0;
|
|
for (sep = servtab; sep; sep = sep->se_next)
|
|
if (sep->se_fd == -1 && !ISMUX(sep))
|
|
setup(sep);
|
|
}
|
|
|
|
void
|
|
setup(sep)
|
|
struct servtab *sep;
|
|
{
|
|
int on = 1;
|
|
|
|
if ((sep->se_fd = socket(AF_INET, sep->se_socktype, 0)) < 0) {
|
|
if (debug)
|
|
fprintf(stderr, "socket failed on %s/%s: %s\n",
|
|
sep->se_service, sep->se_proto,
|
|
strerror(errno));
|
|
syslog(LOG_ERR, "%s/%s: socket: %m",
|
|
sep->se_service, sep->se_proto);
|
|
return;
|
|
}
|
|
#define turnon(fd, opt) \
|
|
setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
|
|
if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
|
|
turnon(sep->se_fd, SO_DEBUG) < 0)
|
|
syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
|
|
if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
|
|
syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
|
|
if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
|
|
syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
|
|
#undef turnon
|
|
if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
|
|
sizeof (sep->se_ctrladdr)) < 0) {
|
|
if (debug)
|
|
fprintf(stderr, "bind failed on %s/%s: %s\n",
|
|
sep->se_service, sep->se_proto,
|
|
strerror(errno));
|
|
syslog(LOG_ERR, "%s/%s: bind: %m",
|
|
sep->se_service, sep->se_proto);
|
|
(void) close(sep->se_fd);
|
|
sep->se_fd = -1;
|
|
if (!timingout) {
|
|
timingout = 1;
|
|
alarm(RETRYTIME);
|
|
}
|
|
return;
|
|
}
|
|
if (sep->se_rpc) {
|
|
int i, len = sizeof(struct sockaddr);
|
|
|
|
if (getsockname(sep->se_fd,
|
|
(struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
|
|
syslog(LOG_ERR, "%s/%s: getsockname: %m",
|
|
sep->se_service, sep->se_proto);
|
|
(void) close(sep->se_fd);
|
|
sep->se_fd = -1;
|
|
return;
|
|
}
|
|
if (debug)
|
|
print_service("REG ", sep);
|
|
for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
|
|
pmap_unset(sep->se_rpc_prog, i);
|
|
pmap_set(sep->se_rpc_prog, i,
|
|
(sep->se_socktype == SOCK_DGRAM)
|
|
? IPPROTO_UDP : IPPROTO_TCP,
|
|
ntohs(sep->se_ctrladdr.sin_port));
|
|
}
|
|
|
|
}
|
|
if (sep->se_socktype == SOCK_STREAM)
|
|
listen(sep->se_fd, 64);
|
|
enable(sep);
|
|
if (debug) {
|
|
fprintf(stderr, "registered %s on %d\n",
|
|
sep->se_server, sep->se_fd);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Finish with a service and its socket.
|
|
*/
|
|
void
|
|
close_sep(sep)
|
|
struct servtab *sep;
|
|
{
|
|
if (sep->se_fd >= 0) {
|
|
if (FD_ISSET(sep->se_fd, &allsock))
|
|
disable(sep);
|
|
(void) close(sep->se_fd);
|
|
sep->se_fd = -1;
|
|
}
|
|
sep->se_count = 0;
|
|
sep->se_numchild = 0; /* forget about any existing children */
|
|
}
|
|
|
|
struct servtab *
|
|
enter(cp)
|
|
struct servtab *cp;
|
|
{
|
|
struct servtab *sep;
|
|
long omask;
|
|
|
|
sep = (struct servtab *)malloc(sizeof (*sep));
|
|
if (sep == (struct servtab *)0) {
|
|
syslog(LOG_ERR, "Out of memory.");
|
|
exit(EX_OSERR);
|
|
}
|
|
*sep = *cp;
|
|
sep->se_fd = -1;
|
|
omask = sigblock(SIGBLOCK);
|
|
sep->se_next = servtab;
|
|
servtab = sep;
|
|
sigsetmask(omask);
|
|
return (sep);
|
|
}
|
|
|
|
void
|
|
enable(struct servtab *sep)
|
|
{
|
|
if (debug)
|
|
fprintf(stderr,
|
|
"enabling %s, fd %d", sep->se_service, sep->se_fd);
|
|
#ifdef SANITY_CHECK
|
|
if (sep->se_fd < 0) {
|
|
syslog(LOG_ERR,
|
|
"%s: %s: bad fd", __FUNCTION__, sep->se_service);
|
|
exit(EX_SOFTWARE);
|
|
}
|
|
if (ISMUX(sep)) {
|
|
syslog(LOG_ERR,
|
|
"%s: %s: is mux", __FUNCTION__, sep->se_service);
|
|
exit(EX_SOFTWARE);
|
|
}
|
|
if (FD_ISSET(sep->se_fd, &allsock)) {
|
|
syslog(LOG_ERR,
|
|
"%s: %s: not off", __FUNCTION__, sep->se_service);
|
|
exit(EX_SOFTWARE);
|
|
}
|
|
#endif
|
|
FD_SET(sep->se_fd, &allsock);
|
|
nsock++;
|
|
if (sep->se_fd > maxsock)
|
|
maxsock = sep->se_fd;
|
|
}
|
|
|
|
void
|
|
disable(struct servtab *sep)
|
|
{
|
|
if (debug)
|
|
fprintf(stderr,
|
|
"disabling %s, fd %d", sep->se_service, sep->se_fd);
|
|
#ifdef SANITY_CHECK
|
|
if (sep->se_fd < 0) {
|
|
syslog(LOG_ERR,
|
|
"%s: %s: bad fd", __FUNCTION__, sep->se_service);
|
|
exit(EX_SOFTWARE);
|
|
}
|
|
if (ISMUX(sep)) {
|
|
syslog(LOG_ERR,
|
|
"%s: %s: is mux", __FUNCTION__, sep->se_service);
|
|
exit(EX_SOFTWARE);
|
|
}
|
|
if (!FD_ISSET(sep->se_fd, &allsock)) {
|
|
syslog(LOG_ERR,
|
|
"%s: %s: not on", __FUNCTION__, sep->se_service);
|
|
exit(EX_SOFTWARE);
|
|
}
|
|
if (nsock == 0) {
|
|
syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__);
|
|
exit(EX_SOFTWARE);
|
|
}
|
|
#endif
|
|
FD_CLR(sep->se_fd, &allsock);
|
|
nsock--;
|
|
if (sep->se_fd == maxsock)
|
|
maxsock--;
|
|
}
|
|
|
|
FILE *fconfig = NULL;
|
|
struct servtab serv;
|
|
char line[LINE_MAX];
|
|
|
|
int
|
|
setconfig()
|
|
{
|
|
|
|
if (fconfig != NULL) {
|
|
fseek(fconfig, 0L, SEEK_SET);
|
|
return (1);
|
|
}
|
|
fconfig = fopen(CONFIG, "r");
|
|
return (fconfig != NULL);
|
|
}
|
|
|
|
void
|
|
endconfig()
|
|
{
|
|
if (fconfig) {
|
|
(void) fclose(fconfig);
|
|
fconfig = NULL;
|
|
}
|
|
}
|
|
|
|
struct servtab *
|
|
getconfigent()
|
|
{
|
|
struct servtab *sep = &serv;
|
|
int argc;
|
|
char *cp, *arg, *s;
|
|
char *versp;
|
|
static char TCPMUX_TOKEN[] = "tcpmux/";
|
|
#define MUX_LEN (sizeof(TCPMUX_TOKEN)-1)
|
|
|
|
more:
|
|
while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0'))
|
|
;
|
|
if (cp == NULL)
|
|
return ((struct servtab *)0);
|
|
/*
|
|
* clear the static buffer, since some fields (se_ctrladdr,
|
|
* for example) don't get initialized here.
|
|
*/
|
|
memset((caddr_t)sep, 0, sizeof *sep);
|
|
arg = skip(&cp);
|
|
if (cp == NULL) {
|
|
/* got an empty line containing just blanks/tabs. */
|
|
goto more;
|
|
}
|
|
if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
|
|
char *c = arg + MUX_LEN;
|
|
if (*c == '+') {
|
|
sep->se_type = MUXPLUS_TYPE;
|
|
c++;
|
|
} else
|
|
sep->se_type = MUX_TYPE;
|
|
sep->se_service = newstr(c);
|
|
} else {
|
|
sep->se_service = newstr(arg);
|
|
sep->se_type = NORM_TYPE;
|
|
}
|
|
arg = sskip(&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(sskip(&cp));
|
|
if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
|
|
memmove(sep->se_proto, sep->se_proto + 4,
|
|
strlen(sep->se_proto) + 1 - 4);
|
|
sep->se_rpc = 1;
|
|
sep->se_rpc_prog = sep->se_rpc_lowvers =
|
|
sep->se_rpc_lowvers = 0;
|
|
sep->se_ctrladdr.sin_family = AF_INET;
|
|
sep->se_ctrladdr.sin_port = 0;
|
|
sep->se_ctrladdr.sin_addr = bind_address;
|
|
if ((versp = rindex(sep->se_service, '/'))) {
|
|
*versp++ = '\0';
|
|
switch (sscanf(versp, "%d-%d",
|
|
&sep->se_rpc_lowvers,
|
|
&sep->se_rpc_highvers)) {
|
|
case 2:
|
|
break;
|
|
case 1:
|
|
sep->se_rpc_highvers =
|
|
sep->se_rpc_lowvers;
|
|
break;
|
|
default:
|
|
syslog(LOG_ERR,
|
|
"bad RPC version specifier; %s\n",
|
|
sep->se_service);
|
|
freeconfig(sep);
|
|
goto more;
|
|
}
|
|
}
|
|
else {
|
|
sep->se_rpc_lowvers =
|
|
sep->se_rpc_highvers = 1;
|
|
}
|
|
}
|
|
arg = sskip(&cp);
|
|
if (!strncmp(arg, "wait", 4))
|
|
sep->se_accept = 0;
|
|
else if (!strncmp(arg, "nowait", 6))
|
|
sep->se_accept = 1;
|
|
else {
|
|
syslog(LOG_ERR,
|
|
"%s: bad wait/nowait for service %s",
|
|
CONFIG, sep->se_service);
|
|
goto more;
|
|
}
|
|
sep->se_maxchild = -1;
|
|
if ((s = strchr(arg, '/')) != NULL) {
|
|
char *eptr;
|
|
u_long val;
|
|
|
|
val = strtoul(s + 1, &eptr, 10);
|
|
if (eptr == s + 1 || *eptr || val > MAX_MAXCHLD) {
|
|
syslog(LOG_ERR,
|
|
"%s: bad max-child for service %s",
|
|
CONFIG, sep->se_service);
|
|
goto more;
|
|
}
|
|
sep->se_maxchild = val;
|
|
}
|
|
if (ISMUX(sep)) {
|
|
/*
|
|
* Silently enforce "nowait" mode for TCPMUX services
|
|
* since they don't have an assigned port to listen on.
|
|
*/
|
|
sep->se_accept = 1;
|
|
if (strcmp(sep->se_proto, "tcp")) {
|
|
syslog(LOG_ERR,
|
|
"%s: bad protocol for tcpmux service %s",
|
|
CONFIG, sep->se_service);
|
|
goto more;
|
|
}
|
|
if (sep->se_socktype != SOCK_STREAM) {
|
|
syslog(LOG_ERR,
|
|
"%s: bad socket type for tcpmux service %s",
|
|
CONFIG, sep->se_service);
|
|
goto more;
|
|
}
|
|
}
|
|
sep->se_user = newstr(sskip(&cp));
|
|
sep->se_server = newstr(sskip(&cp));
|
|
if (strcmp(sep->se_server, "internal") == 0) {
|
|
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_accept = 1; /* force accept mode for built-ins */
|
|
sep->se_bi = bi;
|
|
} else
|
|
sep->se_bi = NULL;
|
|
if (sep->se_maxchild < 0) /* apply default max-children */
|
|
if (sep->se_bi)
|
|
sep->se_maxchild = sep->se_bi->bi_maxchild;
|
|
else
|
|
sep->se_maxchild = sep->se_accept ? 0 : 1;
|
|
if (sep->se_maxchild) {
|
|
sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
|
|
if (sep->se_pids == NULL) {
|
|
syslog(LOG_ERR, "Out of memory.");
|
|
exit(EX_OSERR);
|
|
}
|
|
}
|
|
argc = 0;
|
|
for (arg = skip(&cp); cp; arg = skip(&cp))
|
|
if (argc < MAXARGV) {
|
|
sep->se_argv[argc++] = newstr(arg);
|
|
} else {
|
|
syslog(LOG_ERR,
|
|
"%s: too many arguments for service %s",
|
|
CONFIG, sep->se_service);
|
|
goto more;
|
|
}
|
|
while (argc <= MAXARGV)
|
|
sep->se_argv[argc++] = NULL;
|
|
return (sep);
|
|
}
|
|
|
|
void
|
|
freeconfig(cp)
|
|
struct servtab *cp;
|
|
{
|
|
int i;
|
|
|
|
if (cp->se_service)
|
|
free(cp->se_service);
|
|
if (cp->se_proto)
|
|
free(cp->se_proto);
|
|
if (cp->se_user)
|
|
free(cp->se_user);
|
|
if (cp->se_server)
|
|
free(cp->se_server);
|
|
if (cp->se_pids)
|
|
free(cp->se_pids);
|
|
for (i = 0; i < MAXARGV; i++)
|
|
if (cp->se_argv[i])
|
|
free(cp->se_argv[i]);
|
|
}
|
|
|
|
|
|
/*
|
|
* Safe skip - if skip returns null, log a syntax error in the
|
|
* configuration file and exit.
|
|
*/
|
|
char *
|
|
sskip(cpp)
|
|
char **cpp;
|
|
{
|
|
char *cp;
|
|
|
|
cp = skip(cpp);
|
|
if (cp == NULL) {
|
|
syslog(LOG_ERR, "%s: syntax error", CONFIG);
|
|
exit(EX_DATAERR);
|
|
}
|
|
return (cp);
|
|
}
|
|
|
|
char *
|
|
skip(cpp)
|
|
char **cpp;
|
|
{
|
|
char *cp = *cpp;
|
|
char *start;
|
|
char quote = '\0';
|
|
|
|
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(fconfig)))
|
|
goto again;
|
|
*cpp = (char *)0;
|
|
return ((char *)0);
|
|
}
|
|
if (*cp == '"' || *cp == '\'')
|
|
quote = *cp++;
|
|
start = cp;
|
|
if (quote)
|
|
while (*cp && *cp != quote)
|
|
cp++;
|
|
else
|
|
while (*cp && *cp != ' ' && *cp != '\t')
|
|
cp++;
|
|
if (*cp != '\0')
|
|
*cp++ = '\0';
|
|
*cpp = cp;
|
|
return (start);
|
|
}
|
|
|
|
char *
|
|
nextline(fd)
|
|
FILE *fd;
|
|
{
|
|
char *cp;
|
|
|
|
if (fgets(line, sizeof (line), fd) == NULL)
|
|
return ((char *)0);
|
|
cp = strchr(line, '\n');
|
|
if (cp)
|
|
*cp = '\0';
|
|
return (line);
|
|
}
|
|
|
|
char *
|
|
newstr(cp)
|
|
char *cp;
|
|
{
|
|
if ((cp = strdup(cp ? cp : "")))
|
|
return (cp);
|
|
syslog(LOG_ERR, "strdup: %m");
|
|
exit(EX_OSERR);
|
|
}
|
|
|
|
#ifdef OLD_SETPROCTITLE
|
|
void
|
|
inetd_setproctitle(a, s)
|
|
char *a;
|
|
int s;
|
|
{
|
|
int size;
|
|
char *cp;
|
|
struct sockaddr_in sin;
|
|
char buf[80];
|
|
|
|
cp = Argv[0];
|
|
size = sizeof(sin);
|
|
if (getpeername(s, (struct sockaddr *)&sin, &size) == 0)
|
|
(void) sprintf(buf, "-%s [%s]", a, inet_ntoa(sin.sin_addr));
|
|
else
|
|
(void) sprintf(buf, "-%s", a);
|
|
strncpy(cp, buf, LastArg - cp);
|
|
cp += strlen(cp);
|
|
while (cp < LastArg)
|
|
*cp++ = ' ';
|
|
}
|
|
#else
|
|
void
|
|
inetd_setproctitle(a, s)
|
|
char *a;
|
|
int s;
|
|
{
|
|
int size;
|
|
struct sockaddr_in sin;
|
|
char buf[80];
|
|
|
|
size = sizeof(sin);
|
|
if (getpeername(s, (struct sockaddr *)&sin, &size) == 0)
|
|
(void) sprintf(buf, "%s [%s]", a, inet_ntoa(sin.sin_addr));
|
|
else
|
|
(void) sprintf(buf, "%s", a);
|
|
setproctitle("%s", buf);
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Internet services provided internally by inetd:
|
|
*/
|
|
#define BUFSIZE 8192
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
echo_stream(s, sep) /* Echo service -- echo data back */
|
|
int s;
|
|
struct servtab *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);
|
|
}
|
|
|
|
int check_loop(sin, sep)
|
|
struct sockaddr_in *sin;
|
|
struct servtab *sep;
|
|
{
|
|
struct servtab *se2;
|
|
|
|
for (se2 = servtab; se2; se2 = se2->se_next) {
|
|
if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
|
|
continue;
|
|
|
|
if (sin->sin_port == se2->se_ctrladdr.sin_port) {
|
|
syslog(LOG_WARNING,
|
|
"%s/%s:%s/%s loop request REFUSED from %s",
|
|
sep->se_service, sep->se_proto,
|
|
se2->se_service, se2->se_proto,
|
|
inet_ntoa(sin->sin_addr));
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
echo_dg(s, sep) /* Echo service -- echo data back */
|
|
int s;
|
|
struct servtab *sep;
|
|
{
|
|
char buffer[BUFSIZE];
|
|
int i, size;
|
|
struct sockaddr_in sin;
|
|
|
|
size = sizeof(sin);
|
|
if ((i = recvfrom(s, buffer, sizeof(buffer), 0,
|
|
(struct sockaddr *)&sin, &size)) < 0)
|
|
return;
|
|
|
|
if (check_loop(&sin, sep))
|
|
return;
|
|
|
|
(void) sendto(s, buffer, i, 0, (struct sockaddr *)&sin,
|
|
sizeof(sin));
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
discard_stream(s, sep) /* Discard service -- ignore data */
|
|
int s;
|
|
struct servtab *sep;
|
|
{
|
|
int ret;
|
|
char buffer[BUFSIZE];
|
|
|
|
inetd_setproctitle(sep->se_service, s);
|
|
while (1) {
|
|
while ((ret = read(s, buffer, sizeof(buffer))) > 0)
|
|
;
|
|
if (ret == 0 || errno != EINTR)
|
|
break;
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
discard_dg(s, sep) /* Discard service -- ignore data */
|
|
int s;
|
|
struct servtab *sep;
|
|
{
|
|
char buffer[BUFSIZE];
|
|
|
|
(void) read(s, buffer, sizeof(buffer));
|
|
}
|
|
|
|
#include <ctype.h>
|
|
#define LINESIZ 72
|
|
char ring[128];
|
|
char *endring;
|
|
|
|
void
|
|
initring()
|
|
{
|
|
int i;
|
|
|
|
endring = ring;
|
|
|
|
for (i = 0; i <= 128; ++i)
|
|
if (isprint(i))
|
|
*endring++ = i;
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
chargen_stream(s, sep) /* Character generator */
|
|
int s;
|
|
struct servtab *sep;
|
|
{
|
|
int len;
|
|
char *rs, 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);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
chargen_dg(s, sep) /* Character generator */
|
|
int s;
|
|
struct servtab *sep;
|
|
{
|
|
struct sockaddr_in sin;
|
|
static char *rs;
|
|
int len, size;
|
|
char text[LINESIZ+2];
|
|
|
|
if (endring == 0) {
|
|
initring();
|
|
rs = ring;
|
|
}
|
|
|
|
size = sizeof(sin);
|
|
if (recvfrom(s, text, sizeof(text), 0,
|
|
(struct sockaddr *)&sin, &size) < 0)
|
|
return;
|
|
|
|
if (check_loop(&sin, sep))
|
|
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,
|
|
(struct sockaddr *)&sin, sizeof(sin));
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
long
|
|
machtime()
|
|
{
|
|
struct timeval tv;
|
|
|
|
if (gettimeofday(&tv, (struct timezone *)0) < 0) {
|
|
if (debug)
|
|
fprintf(stderr, "Unable to get time of day\n");
|
|
return (0L);
|
|
}
|
|
#define OFFSET ((u_long)25567 * 24*60*60)
|
|
return (htonl((long)(tv.tv_sec + OFFSET)));
|
|
#undef OFFSET
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
machtime_stream(s, sep)
|
|
int s;
|
|
struct servtab *sep;
|
|
{
|
|
long result;
|
|
|
|
result = machtime();
|
|
(void) write(s, (char *) &result, sizeof(result));
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
machtime_dg(s, sep)
|
|
int s;
|
|
struct servtab *sep;
|
|
{
|
|
long result;
|
|
struct sockaddr_in sin;
|
|
int size;
|
|
|
|
size = sizeof(sin);
|
|
if (recvfrom(s, (char *)&result, sizeof(result), 0,
|
|
(struct sockaddr *)&sin, &size) < 0)
|
|
return;
|
|
|
|
if (check_loop(&sin, sep))
|
|
return;
|
|
|
|
result = machtime();
|
|
(void) sendto(s, (char *) &result, sizeof(result), 0,
|
|
(struct sockaddr *)&sin, sizeof(sin));
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
daytime_stream(s, sep) /* Return human-readable time of day */
|
|
int s;
|
|
struct servtab *sep;
|
|
{
|
|
char buffer[256];
|
|
time_t clock;
|
|
|
|
clock = time((time_t *) 0);
|
|
|
|
(void) sprintf(buffer, "%.24s\r\n", ctime(&clock));
|
|
(void) write(s, buffer, strlen(buffer));
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
void
|
|
daytime_dg(s, sep) /* Return human-readable time of day */
|
|
int s;
|
|
struct servtab *sep;
|
|
{
|
|
char buffer[256];
|
|
time_t clock;
|
|
struct sockaddr_in sin;
|
|
int size;
|
|
|
|
clock = time((time_t *) 0);
|
|
|
|
size = sizeof(sin);
|
|
if (recvfrom(s, buffer, sizeof(buffer), 0,
|
|
(struct sockaddr *)&sin, &size) < 0)
|
|
return;
|
|
|
|
if (check_loop(&sin, sep))
|
|
return;
|
|
|
|
(void) sprintf(buffer, "%.24s\r\n", ctime(&clock));
|
|
(void) sendto(s, buffer, strlen(buffer), 0,
|
|
(struct sockaddr *)&sin, sizeof(sin));
|
|
}
|
|
|
|
/*
|
|
* print_service:
|
|
* Dump relevant information to stderr
|
|
*/
|
|
void
|
|
print_service(action, sep)
|
|
char *action;
|
|
struct servtab *sep;
|
|
{
|
|
fprintf(stderr,
|
|
"%s: %s proto=%s accept=%d max=%d user=%s builtin=%x server=%s\n",
|
|
action, sep->se_service, sep->se_proto,
|
|
sep->se_accept, sep->se_maxchild, sep->se_user,
|
|
(int)sep->se_bi, sep->se_server);
|
|
}
|
|
|
|
/*
|
|
* Based on TCPMUX.C by Mark K. Lottor November 1988
|
|
* sri-nic::ps:<mkl>tcpmux.c
|
|
*/
|
|
|
|
|
|
static int /* # of characters upto \r,\n or \0 */
|
|
getline(fd, buf, len)
|
|
int fd;
|
|
char *buf;
|
|
int len;
|
|
{
|
|
int count = 0, n;
|
|
|
|
do {
|
|
n = read(fd, buf, len-count);
|
|
if (n == 0)
|
|
return (count);
|
|
if (n < 0)
|
|
return (-1);
|
|
while (--n >= 0) {
|
|
if (*buf == '\r' || *buf == '\n' || *buf == '\0')
|
|
return (count);
|
|
count++;
|
|
buf++;
|
|
}
|
|
} while (count < len);
|
|
return (count);
|
|
}
|
|
|
|
#define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */
|
|
|
|
#define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1)
|
|
|
|
struct servtab *
|
|
tcpmux(s)
|
|
int s;
|
|
{
|
|
struct servtab *sep;
|
|
char service[MAX_SERV_LEN+1];
|
|
int len;
|
|
|
|
/* Get requested service name */
|
|
if ((len = getline(s, service, MAX_SERV_LEN)) < 0) {
|
|
strwrite(s, "-Error reading service name\r\n");
|
|
return (NULL);
|
|
}
|
|
service[len] = '\0';
|
|
|
|
if (debug)
|
|
fprintf(stderr, "tcpmux: someone wants %s\n", service);
|
|
|
|
/*
|
|
* Help is a required command, and lists available services,
|
|
* one per line.
|
|
*/
|
|
if (!strcasecmp(service, "help")) {
|
|
for (sep = servtab; sep; sep = sep->se_next) {
|
|
if (!ISMUX(sep))
|
|
continue;
|
|
(void)write(s,sep->se_service,strlen(sep->se_service));
|
|
strwrite(s, "\r\n");
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/* Try matching a service in inetd.conf with the request */
|
|
for (sep = servtab; sep; sep = sep->se_next) {
|
|
if (!ISMUX(sep))
|
|
continue;
|
|
if (!strcasecmp(service, sep->se_service)) {
|
|
if (ISMUXPLUS(sep)) {
|
|
strwrite(s, "+Go\r\n");
|
|
}
|
|
return (sep);
|
|
}
|
|
}
|
|
strwrite(s, "-Service not available\r\n");
|
|
return (NULL);
|
|
}
|