872b698bd4
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586 lines
16 KiB
C
586 lines
16 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1988, 1992 The University of Utah and the Center
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* for Software Science (CSS).
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Center for Software Science of the University of Utah Computer
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* Science Department. CSS requests users of this software to return
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* to css-dist@cs.utah.edu any improvements that they make and grant
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* CSS redistribution rights.
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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. 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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* from: @(#)rmpproto.c 8.1 (Berkeley) 6/4/93
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*
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* From: Utah Hdr: rmpproto.c 3.1 92/07/06
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* Author: Jeff Forys, University of Utah CSS
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*/
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#ifndef lint
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#if 0
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static const char sccsid[] = "@(#)rmpproto.c 8.1 (Berkeley) 6/4/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.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 "defs.h"
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/*
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** ProcessPacket -- determine packet type and do what's required.
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**
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** An RMP BOOT packet has been received. Look at the type field
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** and process Boot Requests, Read Requests, and Boot Complete
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** packets. Any other type will be dropped with a warning msg.
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**
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** Parameters:
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** rconn - the new connection
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** client - list of files available to this host
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**
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** Returns:
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** Nothing.
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**
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** Side Effects:
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** - If this is a valid boot request, it will be added to
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** the linked list of outstanding requests (RmpConns).
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** - If this is a valid boot complete, its associated
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** entry in RmpConns will be deleted.
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** - Also, unless we run out of memory, a reply will be
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** sent to the host that sent the packet.
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*/
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void
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ProcessPacket(RMPCONN *rconn, CLIENT *client)
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{
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struct rmp_packet *rmp;
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RMPCONN *rconnout;
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rmp = &rconn->rmp; /* cache pointer to RMP packet */
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switch(rmp->r_type) { /* do what we came here to do */
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case RMP_BOOT_REQ: /* boot request */
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if ((rconnout = NewConn(rconn)) == NULL)
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return;
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/*
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* If the Session ID is 0xffff, this is a "probe"
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* packet and we do not want to add the connection
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* to the linked list of active connections. There
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* are two types of probe packets, if the Sequence
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* Number is 0 they want to know our host name, o/w
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* they want the name of the file associated with
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* the number spec'd by the Sequence Number.
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*
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* If this is an actual boot request, open the file
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* and send a reply. If SendBootRepl() does not
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* return 0, add the connection to the linked list
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* of active connections, otherwise delete it since
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* an error was encountered.
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*/
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if (ntohs(rmp->r_brq.rmp_session) == RMP_PROBESID) {
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if (WORDZE(rmp->r_brq.rmp_seqno))
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(void) SendServerID(rconnout);
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else
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(void) SendFileNo(rmp, rconnout,
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client? client->files:
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BootFiles);
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FreeConn(rconnout);
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} else {
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if (SendBootRepl(rmp, rconnout,
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client? client->files: BootFiles))
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AddConn(rconnout);
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else
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FreeConn(rconnout);
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}
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break;
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case RMP_BOOT_REPL: /* boot reply (not valid) */
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syslog(LOG_WARNING, "%s: sent a boot reply",
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EnetStr(rconn));
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break;
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case RMP_READ_REQ: /* read request */
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/*
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* Send a portion of the boot file.
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*/
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(void) SendReadRepl(rconn);
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break;
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case RMP_READ_REPL: /* read reply (not valid) */
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syslog(LOG_WARNING, "%s: sent a read reply",
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EnetStr(rconn));
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break;
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case RMP_BOOT_DONE: /* boot complete */
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/*
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* Remove the entry from the linked list of active
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* connections.
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*/
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(void) BootDone(rconn);
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break;
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default: /* unknown RMP packet type */
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syslog(LOG_WARNING, "%s: unknown packet type (%u)",
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EnetStr(rconn), rmp->r_type);
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}
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}
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/*
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** SendServerID -- send our host name to who ever requested it.
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**
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** Parameters:
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** rconn - the reply packet to be formatted.
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**
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** Returns:
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** 1 on success, 0 on failure.
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**
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** Side Effects:
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** none.
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*/
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int
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SendServerID(RMPCONN *rconn)
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{
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struct rmp_packet *rpl;
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char *src, *dst;
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u_int8_t *size;
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rpl = &rconn->rmp; /* cache ptr to RMP packet */
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/*
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* Set up assorted fields in reply packet.
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*/
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rpl->r_brpl.rmp_type = RMP_BOOT_REPL;
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rpl->r_brpl.rmp_retcode = RMP_E_OKAY;
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ZEROWORD(rpl->r_brpl.rmp_seqno);
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rpl->r_brpl.rmp_session = 0;
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rpl->r_brpl.rmp_version = htons(RMP_VERSION);
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size = &rpl->r_brpl.rmp_flnmsize; /* ptr to length of host name */
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/*
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* Copy our host name into the reply packet incrementing the
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* length as we go. Stop at RMP_HOSTLEN or the first dot.
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*/
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src = MyHost;
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dst = (char *) &rpl->r_brpl.rmp_flnm;
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for (*size = 0; *size < RMP_HOSTLEN; (*size)++) {
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if (*src == '.' || *src == '\0')
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break;
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*dst++ = *src++;
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}
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rconn->rmplen = RMPBOOTSIZE(*size); /* set packet length */
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return(SendPacket(rconn)); /* send packet */
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}
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/*
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** SendFileNo -- send the name of a bootable file to the requester.
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**
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** Parameters:
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** req - RMP BOOT packet containing the request.
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** rconn - the reply packet to be formatted.
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** filelist - list of files available to the requester.
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**
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** Returns:
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** 1 on success, 0 on failure.
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**
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** Side Effects:
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** none.
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*/
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int
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SendFileNo(struct rmp_packet *req, RMPCONN *rconn, char *filelist[])
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{
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struct rmp_packet *rpl;
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char *src, *dst;
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u_int8_t *size;
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int i;
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GETWORD(req->r_brpl.rmp_seqno, i); /* SeqNo is really FileNo */
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rpl = &rconn->rmp; /* cache ptr to RMP packet */
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/*
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* Set up assorted fields in reply packet.
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*/
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rpl->r_brpl.rmp_type = RMP_BOOT_REPL;
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PUTWORD(i, rpl->r_brpl.rmp_seqno);
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i--;
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rpl->r_brpl.rmp_session = 0;
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rpl->r_brpl.rmp_version = htons(RMP_VERSION);
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size = &rpl->r_brpl.rmp_flnmsize; /* ptr to length of filename */
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*size = 0; /* init length to zero */
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/*
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* Copy the file name into the reply packet incrementing the
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* length as we go. Stop at end of string or when RMPBOOTDATA
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* characters have been copied. Also, set return code to
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* indicate success or "no more files".
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*/
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if (i < C_MAXFILE && filelist[i] != NULL) {
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src = filelist[i];
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dst = (char *)&rpl->r_brpl.rmp_flnm;
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for (; *src && *size < RMPBOOTDATA; (*size)++) {
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if (*src == '\0')
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break;
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*dst++ = *src++;
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}
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rpl->r_brpl.rmp_retcode = RMP_E_OKAY;
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} else
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rpl->r_brpl.rmp_retcode = RMP_E_NODFLT;
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rconn->rmplen = RMPBOOTSIZE(*size); /* set packet length */
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return(SendPacket(rconn)); /* send packet */
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}
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/*
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** SendBootRepl -- open boot file and respond to boot request.
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**
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** Parameters:
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** req - RMP BOOT packet containing the request.
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** rconn - the reply packet to be formatted.
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** filelist - list of files available to the requester.
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**
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** Returns:
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** 1 on success, 0 on failure.
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**
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** Side Effects:
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** none.
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*/
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int
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SendBootRepl(struct rmp_packet *req, RMPCONN *rconn, char *filelist[])
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{
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int retval;
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char *filename, filepath[RMPBOOTDATA+1];
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RMPCONN *oldconn;
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struct rmp_packet *rpl;
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char *src, *dst1, *dst2;
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u_int8_t i;
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/*
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* If another connection already exists, delete it since we
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* are obviously starting again.
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*/
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if ((oldconn = FindConn(rconn)) != NULL) {
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syslog(LOG_WARNING, "%s: dropping existing connection",
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EnetStr(oldconn));
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RemoveConn(oldconn);
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}
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rpl = &rconn->rmp; /* cache ptr to RMP packet */
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/*
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* Set up assorted fields in reply packet.
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*/
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rpl->r_brpl.rmp_type = RMP_BOOT_REPL;
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COPYWORD(req->r_brq.rmp_seqno, rpl->r_brpl.rmp_seqno);
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rpl->r_brpl.rmp_session = htons(GenSessID());
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rpl->r_brpl.rmp_version = htons(RMP_VERSION);
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rpl->r_brpl.rmp_flnmsize = req->r_brq.rmp_flnmsize;
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/*
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* Copy file name to `filepath' string, and into reply packet.
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*/
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src = &req->r_brq.rmp_flnm;
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dst1 = filepath;
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dst2 = &rpl->r_brpl.rmp_flnm;
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for (i = 0; i < req->r_brq.rmp_flnmsize; i++)
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*dst1++ = *dst2++ = *src++;
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*dst1 = '\0';
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/*
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* If we are booting HP-UX machines, their secondary loader will
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* ask for files like "/hp-ux". As a security measure, we do not
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* allow boot files to lay outside the boot directory (unless they
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* are purposely link'd out. So, make `filename' become the path-
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* stripped file name and spoof the client into thinking that it
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* really got what it wanted.
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*/
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filename = (filename = strrchr(filepath,'/'))? ++filename: filepath;
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/*
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* Check that this is a valid boot file name.
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*/
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for (i = 0; i < C_MAXFILE && filelist[i] != NULL; i++)
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if (STREQN(filename, filelist[i]))
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goto match;
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/*
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* Invalid boot file name, set error and send reply packet.
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*/
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rpl->r_brpl.rmp_retcode = RMP_E_NOFILE;
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retval = 0;
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goto sendpkt;
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match:
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/*
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* This is a valid boot file. Open the file and save the file
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* descriptor associated with this connection and set success
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* indication. If the file couldnt be opened, set error:
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* "no such file or dir" - RMP_E_NOFILE
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* "file table overflow" - RMP_E_BUSY
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* "too many open files" - RMP_E_BUSY
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* anything else - RMP_E_OPENFILE
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*/
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if ((rconn->bootfd = open(filename, O_RDONLY, 0600)) < 0) {
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rpl->r_brpl.rmp_retcode = (errno == ENOENT)? RMP_E_NOFILE:
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(errno == EMFILE || errno == ENFILE)? RMP_E_BUSY:
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RMP_E_OPENFILE;
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retval = 0;
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} else {
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rpl->r_brpl.rmp_retcode = RMP_E_OKAY;
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retval = 1;
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}
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sendpkt:
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syslog(LOG_INFO, "%s: request to boot %s (%s)",
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EnetStr(rconn), filename, retval? "granted": "denied");
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rconn->rmplen = RMPBOOTSIZE(rpl->r_brpl.rmp_flnmsize);
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return (retval & SendPacket(rconn));
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}
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/*
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** SendReadRepl -- send a portion of the boot file to the requester.
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**
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** Parameters:
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** rconn - the reply packet to be formatted.
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**
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** Returns:
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** 1 on success, 0 on failure.
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**
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** Side Effects:
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** none.
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*/
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int
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SendReadRepl(RMPCONN *rconn)
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{
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int retval = 0;
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RMPCONN *oldconn;
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struct rmp_packet *rpl, *req;
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int size = 0;
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int madeconn = 0;
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/*
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* Find the old connection. If one doesn't exist, create one only
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* to return the error code.
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*/
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if ((oldconn = FindConn(rconn)) == NULL) {
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if ((oldconn = NewConn(rconn)) == NULL)
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return(0);
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syslog(LOG_ERR, "SendReadRepl: no active connection (%s)",
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EnetStr(rconn));
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madeconn++;
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}
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req = &rconn->rmp; /* cache ptr to request packet */
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rpl = &oldconn->rmp; /* cache ptr to reply packet */
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if (madeconn) { /* no active connection above; abort */
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rpl->r_rrpl.rmp_retcode = RMP_E_ABORT;
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retval = 1;
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goto sendpkt;
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}
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/*
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* Make sure Session ID's match.
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*/
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if (ntohs(req->r_rrq.rmp_session) !=
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((rpl->r_type == RMP_BOOT_REPL)? ntohs(rpl->r_brpl.rmp_session):
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ntohs(rpl->r_rrpl.rmp_session))) {
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syslog(LOG_ERR, "SendReadRepl: bad session id (%s)",
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EnetStr(rconn));
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rpl->r_rrpl.rmp_retcode = RMP_E_BADSID;
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retval = 1;
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goto sendpkt;
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}
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/*
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* If the requester asks for more data than we can fit,
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* silently clamp the request size down to RMPREADDATA.
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*
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* N.B. I do not know if this is "legal", however it seems
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* to work. This is necessary for bpfwrite() on machines
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* with MCLBYTES less than 1514.
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*/
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if (ntohs(req->r_rrq.rmp_size) > RMPREADDATA)
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req->r_rrq.rmp_size = htons(RMPREADDATA);
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/*
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* Position read head on file according to info in request packet.
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*/
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GETWORD(req->r_rrq.rmp_offset, size);
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if (lseek(oldconn->bootfd, (off_t)size, SEEK_SET) < 0) {
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syslog(LOG_ERR, "SendReadRepl: lseek: %m (%s)",
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EnetStr(rconn));
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rpl->r_rrpl.rmp_retcode = RMP_E_ABORT;
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retval = 1;
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goto sendpkt;
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}
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/*
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* Read data directly into reply packet.
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*/
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if ((size = read(oldconn->bootfd, &rpl->r_rrpl.rmp_data,
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(int) ntohs(req->r_rrq.rmp_size))) <= 0) {
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if (size < 0) {
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syslog(LOG_ERR, "SendReadRepl: read: %m (%s)",
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EnetStr(rconn));
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rpl->r_rrpl.rmp_retcode = RMP_E_ABORT;
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} else {
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rpl->r_rrpl.rmp_retcode = RMP_E_EOF;
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}
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retval = 1;
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goto sendpkt;
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}
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/*
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* Set success indication.
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*/
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rpl->r_rrpl.rmp_retcode = RMP_E_OKAY;
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sendpkt:
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/*
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* Set up assorted fields in reply packet.
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*/
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rpl->r_rrpl.rmp_type = RMP_READ_REPL;
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COPYWORD(req->r_rrq.rmp_offset, rpl->r_rrpl.rmp_offset);
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rpl->r_rrpl.rmp_session = req->r_rrq.rmp_session;
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oldconn->rmplen = RMPREADSIZE(size); /* set size of packet */
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retval &= SendPacket(oldconn); /* send packet */
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if (madeconn) /* clean up after ourself */
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FreeConn(oldconn);
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|
|
return (retval);
|
|
}
|
|
|
|
/*
|
|
** BootDone -- free up memory allocated for a connection.
|
|
**
|
|
** Parameters:
|
|
** rconn - incoming boot complete packet.
|
|
**
|
|
** Returns:
|
|
** 1 on success, 0 on failure.
|
|
**
|
|
** Side Effects:
|
|
** none.
|
|
*/
|
|
int
|
|
BootDone(RMPCONN *rconn)
|
|
{
|
|
RMPCONN *oldconn;
|
|
struct rmp_packet *rpl;
|
|
|
|
/*
|
|
* If we can't find the connection, ignore the request.
|
|
*/
|
|
if ((oldconn = FindConn(rconn)) == NULL) {
|
|
syslog(LOG_ERR, "BootDone: no existing connection (%s)",
|
|
EnetStr(rconn));
|
|
return(0);
|
|
}
|
|
|
|
rpl = &oldconn->rmp; /* cache ptr to RMP packet */
|
|
|
|
/*
|
|
* Make sure Session ID's match.
|
|
*/
|
|
if (ntohs(rconn->rmp.r_rrq.rmp_session) !=
|
|
((rpl->r_type == RMP_BOOT_REPL)? ntohs(rpl->r_brpl.rmp_session):
|
|
ntohs(rpl->r_rrpl.rmp_session))) {
|
|
syslog(LOG_ERR, "BootDone: bad session id (%s)",
|
|
EnetStr(rconn));
|
|
return(0);
|
|
}
|
|
|
|
RemoveConn(oldconn); /* remove connection */
|
|
|
|
syslog(LOG_INFO, "%s: boot complete", EnetStr(rconn));
|
|
|
|
return(1);
|
|
}
|
|
|
|
/*
|
|
** SendPacket -- send an RMP packet to a remote host.
|
|
**
|
|
** Parameters:
|
|
** rconn - packet to be sent.
|
|
**
|
|
** Returns:
|
|
** 1 on success, 0 on failure.
|
|
**
|
|
** Side Effects:
|
|
** none.
|
|
*/
|
|
int
|
|
SendPacket(RMPCONN *rconn)
|
|
{
|
|
/*
|
|
* Set Ethernet Destination address to Source (BPF and the enet
|
|
* driver will take care of getting our source address set).
|
|
*/
|
|
memmove((char *)&rconn->rmp.hp_hdr.daddr[0],
|
|
(char *)&rconn->rmp.hp_hdr.saddr[0], RMP_ADDRLEN);
|
|
rconn->rmp.hp_hdr.len = htons(rconn->rmplen - sizeof(struct hp_hdr));
|
|
|
|
/*
|
|
* Reverse 802.2/HP Extended Source & Destination Access Pts.
|
|
*/
|
|
rconn->rmp.hp_llc.dxsap = htons(HPEXT_SXSAP);
|
|
rconn->rmp.hp_llc.sxsap = htons(HPEXT_DXSAP);
|
|
|
|
/*
|
|
* Last time this connection was active.
|
|
*/
|
|
(void)gettimeofday(&rconn->tstamp, NULL);
|
|
|
|
if (DbgFp != NULL) /* display packet */
|
|
DispPkt(rconn,DIR_SENT);
|
|
|
|
/*
|
|
* Send RMP packet to remote host.
|
|
*/
|
|
return(BpfWrite(rconn));
|
|
}
|