581 lines
16 KiB
C
581 lines
16 KiB
C
/*
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* Copyright (c) 1992 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software_Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*/
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/*
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* SUP Communication Module for 4.3 BSD
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*
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* SUP COMMUNICATION MODULE SPECIFICATIONS:
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*
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* IN THIS MODULE:
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*
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* CONNECTION ROUTINES
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*
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* FOR SERVER
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* servicesetup (port) establish TCP port connection
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* char *port; name of service
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* service () accept TCP port connection
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* servicekill () close TCP port in use by another process
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* serviceprep () close temp ports used to make connection
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* serviceend () close TCP port
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*
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* FOR CLIENT
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* request (port,hostname,retry) establish TCP port connection
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* char *port,*hostname; name of service and host
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* int retry; true if retries should be used
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* requestend () close TCP port
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*
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* HOST NAME CHECKING
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* p = remotehost () remote host name (if known)
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* char *p;
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* i = samehost () whether remote host is also this host
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* int i;
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* i = matchhost (name) whether remote host is same as name
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* int i;
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* char *name;
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*
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* RETURN CODES
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* All procedures return values as indicated above. Other routines
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* normally return SCMOK on success, SCMERR on error.
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*
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* COMMUNICATION PROTOCOL
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*
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* Described in scmio.c.
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*
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**********************************************************************
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* HISTORY
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* 2-Oct-92 Mary Thompson (mrt) at Carnegie-Mellon University
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* Added conditional declarations of INADDR_NONE and INADDR_LOOPBACK
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* since Tahoe version of <netinet/in.h> does not define them.
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*
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* $Log: scm.c,v $
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* Revision 1.1.1.1 1993/05/21 14:52:17 cgd
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* initial import of CMU's SUP to NetBSD
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*
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* Revision 1.13 92/08/11 12:05:35 mrt
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* Added changes from stump:
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* Allow for multiple interfaces, and for numeric addresses.
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* Changed to use builtin port for the "supfiledbg"
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* service when getservbyname() cannot find it.
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* Added forward static declatations, delinted.
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* Updated variable argument usage.
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* [92/08/08 mrt]
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*
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* Revision 1.12 92/02/08 19:01:11 mja
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* Add (struct sockaddr *) casts for HC 2.1.
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* [92/02/08 18:59:09 mja]
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*
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* Revision 1.11 89/08/03 19:49:03 mja
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* Updated to use v*printf() in place of _doprnt().
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* [89/04/19 mja]
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*
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* 11-Feb-88 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Moved sleep into computeBackoff, renamed to dobackoff.
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*
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* 10-Feb-88 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Added timeout to backoff.
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*
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* 27-Dec-87 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Removed nameserver support.
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*
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* 09-Sep-87 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Fixed to depend less upon having name of remote host.
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*
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* 25-May-87 Doug Philips (dwp) at Carnegie-Mellon Universtiy
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* Extracted backoff/sleeptime computation from "request" and
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* created "computeBackoff" so that I could use it in sup.c when
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* trying to get to nameservers as a group.
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*
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* 21-May-87 Chriss Stephens (chriss) at Carnegie Mellon University
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* Merged divergent CS and EE versions.
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*
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* 02-May-87 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Added some bullet-proofing code around hostname calls.
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*
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* 31-Mar-87 Dan Nydick (dan) at Carnegie-Mellon University
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* Fixed for 4.3.
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*
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* 30-May-86 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Added code to use known values for well-known ports if they are
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* not found in the host table.
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*
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* 19-Feb-86 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Changed setsockopt SO_REUSEADDR to be non-fatal. Added fourth
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* parameter as described in 4.3 manual entry.
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*
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* 15-Feb-86 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Added call of readflush() to requestend() routine.
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*
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* 29-Dec-85 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Major rewrite for protocol version 4. All read/write and crypt
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* routines are now in scmio.c.
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*
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* 14-Dec-85 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Added setsockopt SO_REUSEADDR call.
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*
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* 01-Dec-85 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Removed code to "gracefully" handle unexpected messages. This
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* seems reasonable since it didn't work anyway, and should be
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* handled at a higher level anyway by adhering to protocol version
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* number conventions.
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*
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* 26-Nov-85 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Fixed scm.c to free space for remote host name when connection
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* is closed.
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*
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* 07-Nov-85 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Fixed 4.2 retry code to reload sin values before retry.
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*
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* 22-Oct-85 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Added code to retry initial connection open request.
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*
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* 22-Sep-85 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Merged 4.1 and 4.2 versions together.
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*
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* 21-Sep-85 Glenn Marcy (gm0w) at Carnegie-Mellon University
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* Add close() calls after pipe() call.
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*
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* 12-Jun-85 Steven Shafer (sas) at Carnegie-Mellon University
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* Converted for 4.2 sockets; added serviceprep() routine.
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*
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* 04-Jun-85 Steven Shafer (sas) at Carnegie-Mellon University
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* Created for 4.2 BSD.
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*
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**********************************************************************
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*/
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#include <libc.h>
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#include <errno.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <netdb.h>
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#include "sup.h"
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#ifndef INADDR_NONE
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#define INADDR_NONE 0xffffffff /* -1 return */
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#endif
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#ifndef INADDR_LOOPBACK
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#define INADDR_LOOPBACK (u_long)0x7f000001 /* 127.0.0.1 */
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#endif
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extern int errno;
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static char *myhost ();
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char scmversion[] = "4.3 BSD";
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/*************************
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*** M A C R O S ***
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*************************/
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/* networking parameters */
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#define NCONNECTS 5
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/*********************************************
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*** G L O B A L V A R I A B L E S ***
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*********************************************/
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extern char program[]; /* name of program we are running */
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extern int progpid; /* process id to display */
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int netfile = -1; /* network file descriptor */
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static int sock = -1; /* socket used to make connection */
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static struct in_addr remoteaddr; /* remote host address */
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static char *remotename = NULL; /* remote host name */
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static int swapmode; /* byte-swapping needed on server? */
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/***************************************************
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*** C O N N E C T I O N R O U T I N E S ***
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*** F O R S E R V E R ***
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***************************************************/
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servicesetup (server) /* listen for clients */
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char *server;
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{
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struct sockaddr_in sin;
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struct servent *sp;
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short port;
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int one = 1;
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if (myhost () == NULL)
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return (scmerr (-1,"Local hostname not known"));
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if ((sp = getservbyname(server,"tcp")) == 0) {
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if (strcmp(server, FILEPORT) == 0)
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port = htons((u_short)FILEPORTNUM);
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else if (strcmp(server, DEBUGFPORT) == 0)
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port = htons((u_short)DEBUGFPORTNUM);
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else
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return (scmerr (-1,"Can't find %s server description",server));
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(void) scmerr (-1,"%s/tcp: unknown service: using port %d",
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server,port);
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} else
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port = sp->s_port;
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endservent ();
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sock = socket (AF_INET,SOCK_STREAM,0);
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if (sock < 0)
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return (scmerr (errno,"Can't create socket for connections"));
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if (setsockopt (sock,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(int)) < 0)
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(void) scmerr (errno,"Can't set SO_REUSEADDR socket option");
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(void) bzero ((char *)&sin,sizeof(sin));
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sin.sin_family = AF_INET;
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sin.sin_port = port;
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if (bind (sock,(struct sockaddr *)&sin,sizeof(sin)) < 0)
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return (scmerr (errno,"Can't bind socket for connections"));
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if (listen (sock,NCONNECTS) < 0)
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return (scmerr (errno,"Can't listen on socket"));
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return (SCMOK);
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}
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service ()
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{
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struct sockaddr_in from;
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int x,len;
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remotename = NULL;
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len = sizeof (from);
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do {
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netfile = accept (sock,(struct sockaddr *)&from,&len);
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} while (netfile < 0 && errno == EINTR);
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if (netfile < 0)
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return (scmerr (errno,"Can't accept connections"));
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remoteaddr = from.sin_addr;
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if (read(netfile,(char *)&x,sizeof(int)) != sizeof(int))
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return (scmerr (errno,"Can't transmit data on connection"));
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if (x == 0x01020304)
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swapmode = 0;
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else if (x == 0x04030201)
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swapmode = 1;
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else
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return (scmerr (-1,"Unexpected byteswap mode %x",x));
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return (SCMOK);
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}
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serviceprep () /* kill temp socket in daemon */
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{
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if (sock >= 0) {
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(void) close (sock);
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sock = -1;
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}
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return (SCMOK);
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}
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servicekill () /* kill net file in daemon's parent */
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{
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if (netfile >= 0) {
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(void) close (netfile);
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netfile = -1;
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}
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if (remotename) {
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free (remotename);
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remotename = NULL;
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}
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return (SCMOK);
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}
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serviceend () /* kill net file after use in daemon */
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{
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if (netfile >= 0) {
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(void) close (netfile);
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netfile = -1;
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}
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if (remotename) {
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free (remotename);
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remotename = NULL;
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}
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return (SCMOK);
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}
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/***************************************************
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*** C O N N E C T I O N R O U T I N E S ***
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*** F O R C L I E N T ***
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***************************************************/
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dobackoff (t,b)
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int *t,*b;
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{
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struct timeval tt;
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unsigned s;
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if (*t == 0)
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return (0);
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s = *b * 30;
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if (gettimeofday (&tt,(struct timezone *)NULL) >= 0)
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s += (tt.tv_usec >> 8) % s;
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if (*b < 32) *b <<= 1;
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if (*t != -1) {
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if (s > *t)
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s = *t;
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*t -= s;
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}
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(void) scmerr (-1,"Will retry in %d seconds",s);
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sleep (s);
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return (1);
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}
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request (server,hostname,retry) /* connect to server */
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char *server;
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char *hostname;
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int *retry;
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{
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int x, backoff;
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struct hostent *h;
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struct servent *sp;
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struct sockaddr_in sin, tin;
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short port;
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if ((sp = getservbyname(server,"tcp")) == 0) {
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if (strcmp(server, FILEPORT) == 0)
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port = htons((u_short)FILEPORTNUM);
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else if (strcmp(server, DEBUGFPORT) == 0)
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port = htons((u_short)DEBUGFPORTNUM);
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else
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return (scmerr (-1,"Can't find %s server description",
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server));
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(void) scmerr (-1,"%s/tcp: unknown service: using port %d",
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server,port);
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} else
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port = sp->s_port;
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(void) bzero ((char *)&sin,sizeof(sin));
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = inet_addr (hostname);
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if (sin.sin_addr.s_addr == (u_long) INADDR_NONE) {
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if ((h = gethostbyname (hostname)) == NULL)
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return (scmerr (-1,"Can't find host entry for %s",
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hostname));
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hostname = h->h_name;
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(void) bcopy (h->h_addr,(char *)&sin.sin_addr,h->h_length);
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}
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sin.sin_port = port;
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backoff = 1;
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for (;;) {
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netfile = socket (AF_INET,SOCK_STREAM,0);
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if (netfile < 0)
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return (scmerr (errno,"Can't create socket"));
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tin = sin;
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if (connect(netfile,(struct sockaddr *)&tin,sizeof(tin)) >= 0)
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break;
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(void) scmerr (errno,"Can't connect to server for %s",server);
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(void) close(netfile);
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if (!dobackoff (retry,&backoff))
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return (SCMERR);
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}
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remoteaddr = sin.sin_addr;
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remotename = salloc(hostname);
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x = 0x01020304;
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(void) write (netfile,(char *)&x,sizeof(int));
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swapmode = 0; /* swap only on server, not client */
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return (SCMOK);
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}
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requestend () /* end connection to server */
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{
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(void) readflush ();
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if (netfile >= 0) {
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(void) close (netfile);
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netfile = -1;
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}
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if (remotename) {
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free (remotename);
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remotename = NULL;
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}
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return (SCMOK);
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}
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/*************************************************
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*** H O S T N A M E C H E C K I N G ***
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*************************************************/
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static
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char *myhost () /* find my host name */
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{
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struct hostent *h;
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static char name[MAXHOSTNAMELEN];
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if (name[0] == '\0') {
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if (gethostname (name,MAXHOSTNAMELEN) < 0)
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return (NULL);
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if ((h = gethostbyname (name)) == NULL)
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return (NULL);
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(void) strcpy (name,h->h_name);
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}
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return (name);
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}
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char *remotehost () /* remote host name (if known) */
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{
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register struct hostent *h;
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if (remotename == NULL) {
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h = gethostbyaddr ((char *)&remoteaddr,sizeof(remoteaddr),
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AF_INET);
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remotename = salloc (h ? h->h_name : inet_ntoa(remoteaddr));
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if (remotename == NULL)
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return("UNKNOWN");
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}
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return (remotename);
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}
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int thishost (host)
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register char *host;
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{
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register struct hostent *h;
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char *name;
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if ((name = myhost ()) == NULL)
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logquit (1,"Can't find my host entry");
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h = gethostbyname (host);
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if (h == NULL) return (0);
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return (strcasecmp (name,h->h_name) == 0);
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}
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int samehost () /* is remote host same as local host? */
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|
{
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static struct in_addr *intp;
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static int nint = 0;
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struct in_addr *ifp;
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int n;
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if (nint <= 0) {
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int s;
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char buf[BUFSIZ];
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struct ifconf ifc;
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struct ifreq *ifr;
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struct sockaddr_in sin;
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if ((s = socket (AF_INET,SOCK_DGRAM,0)) < 0)
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logquit (1,"Can't create socket for SIOCGIFCONF");
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ifc.ifc_len = sizeof(buf);
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ifc.ifc_buf = buf;
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if (ioctl (s,SIOCGIFCONF,(char *)&ifc) < 0)
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logquit (1,"SIOCGIFCONF failed");
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(void) close(s);
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if ((nint = ifc.ifc_len/sizeof(struct ifreq)) <= 0)
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return (0);
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intp = (struct in_addr *)
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malloc ((unsigned) nint*sizeof(struct in_addr));
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if ((ifp = intp) == 0)
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logquit (1,"no space for interfaces");
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for (ifr = ifc.ifc_req, n = nint; n > 0; --n, ifr++) {
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(void) bcopy ((char *)&ifr->ifr_addr,(char *)&sin,sizeof(sin));
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*ifp++ = sin.sin_addr;
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}
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}
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if (remoteaddr.s_addr == htonl(INADDR_LOOPBACK))
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return (1);
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for (ifp = intp, n = nint; n > 0; --n, ifp++)
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if (remoteaddr.s_addr == ifp->s_addr)
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return (1);
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return (0);
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}
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|
|
int matchhost (name) /* is this name of remote host? */
|
|
char *name;
|
|
{
|
|
struct hostent *h;
|
|
struct in_addr addr;
|
|
char **ap;
|
|
if ((addr.s_addr = inet_addr(name)) != (u_long) INADDR_NONE)
|
|
return (addr.s_addr == remoteaddr.s_addr);
|
|
if ((h = gethostbyname (name)) == 0)
|
|
return (0);
|
|
if (h->h_addrtype != AF_INET || h->h_length != sizeof(struct in_addr))
|
|
return (0);
|
|
for (ap = h->h_addr_list; *ap; ap++)
|
|
if (bcmp ((char *)&remoteaddr,*ap,h->h_length) == 0)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
#if __STDC__
|
|
int scmerr (int errno,char *fmt,...)
|
|
#else
|
|
/*VARARGS*//*ARGSUSED*/
|
|
int scmerr (va_alist)
|
|
va_dcl
|
|
#endif
|
|
{
|
|
#if !__STDC__
|
|
int errno;
|
|
char *fmt;
|
|
#endif
|
|
va_list ap;
|
|
|
|
(void) fflush (stdout);
|
|
if (progpid > 0)
|
|
fprintf (stderr,"%s %d: ",program,progpid);
|
|
else
|
|
fprintf (stderr,"%s: ",program);
|
|
#if __STDC__
|
|
va_start(ap,fmt);
|
|
#else
|
|
va_start(ap);
|
|
errno = va_arg(ap,int);
|
|
fmt = va_arg(ap,char *);
|
|
#endif
|
|
vfprintf(stderr, fmt, ap);
|
|
va_end(ap);
|
|
if (errno >= 0)
|
|
fprintf (stderr,": %s\n",errmsg(errno));
|
|
else
|
|
fprintf (stderr,"\n");
|
|
(void) fflush (stderr);
|
|
return (SCMERR);
|
|
}
|
|
|
|
/*******************************************************
|
|
*** I N T E G E R B Y T E - S W A P P I N G ***
|
|
*******************************************************/
|
|
|
|
union intchar {
|
|
int ui;
|
|
char uc[sizeof(int)];
|
|
};
|
|
|
|
int byteswap (in)
|
|
int in;
|
|
{
|
|
union intchar x,y;
|
|
register int ix,iy;
|
|
|
|
if (swapmode == 0) return (in);
|
|
x.ui = in;
|
|
iy = sizeof(int);
|
|
for (ix=0; ix<sizeof(int); ix++) {
|
|
--iy;
|
|
y.uc[iy] = x.uc[ix];
|
|
}
|
|
return (y.ui);
|
|
}
|