588 lines
16 KiB
C
588 lines
16 KiB
C
/*
|
|
* Copyright (c) 1988, 1992 The University of Utah and the Center
|
|
* for Software Science (CSS).
|
|
* Copyright (c) 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Center for Software Science of the University of Utah Computer
|
|
* Science Department. CSS requests users of this software to return
|
|
* to css-dist@cs.utah.edu any improvements that they make and grant
|
|
* CSS redistribution rights.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from: @(#)rmpproto.c 8.1 (Berkeley) 6/4/93
|
|
*
|
|
* From: Utah Hdr: rmpproto.c 3.1 92/07/06
|
|
* Author: Jeff Forys, University of Utah CSS
|
|
*/
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static const char sccsid[] = "@(#)rmpproto.c 8.1 (Berkeley) 6/4/93";
|
|
#endif
|
|
static const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#endif /* not lint */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
#include <netinet/in.h>
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <syslog.h>
|
|
#include <unistd.h>
|
|
#include "defs.h"
|
|
|
|
/*
|
|
** ProcessPacket -- determine packet type and do what's required.
|
|
**
|
|
** An RMP BOOT packet has been received. Look at the type field
|
|
** and process Boot Requests, Read Requests, and Boot Complete
|
|
** packets. Any other type will be dropped with a warning msg.
|
|
**
|
|
** Parameters:
|
|
** rconn - the new connection
|
|
** client - list of files available to this host
|
|
**
|
|
** Returns:
|
|
** Nothing.
|
|
**
|
|
** Side Effects:
|
|
** - If this is a valid boot request, it will be added to
|
|
** the linked list of outstanding requests (RmpConns).
|
|
** - If this is a valid boot complete, its associated
|
|
** entry in RmpConns will be deleted.
|
|
** - Also, unless we run out of memory, a reply will be
|
|
** sent to the host that sent the packet.
|
|
*/
|
|
void
|
|
ProcessPacket(RMPCONN *rconn, CLIENT *client)
|
|
{
|
|
struct rmp_packet *rmp;
|
|
RMPCONN *rconnout;
|
|
|
|
rmp = &rconn->rmp; /* cache pointer to RMP packet */
|
|
|
|
switch(rmp->r_type) { /* do what we came here to do */
|
|
case RMP_BOOT_REQ: /* boot request */
|
|
if ((rconnout = NewConn(rconn)) == NULL)
|
|
return;
|
|
|
|
/*
|
|
* If the Session ID is 0xffff, this is a "probe"
|
|
* packet and we do not want to add the connection
|
|
* to the linked list of active connections. There
|
|
* are two types of probe packets, if the Sequence
|
|
* Number is 0 they want to know our host name, o/w
|
|
* they want the name of the file associated with
|
|
* the number spec'd by the Sequence Number.
|
|
*
|
|
* If this is an actual boot request, open the file
|
|
* and send a reply. If SendBootRepl() does not
|
|
* return 0, add the connection to the linked list
|
|
* of active connections, otherwise delete it since
|
|
* an error was encountered.
|
|
*/
|
|
if (ntohs(rmp->r_brq.rmp_session) == RMP_PROBESID) {
|
|
if (WORDZE(rmp->r_brq.rmp_seqno))
|
|
(void) SendServerID(rconnout);
|
|
else
|
|
(void) SendFileNo(rmp, rconnout,
|
|
client? client->files:
|
|
BootFiles);
|
|
FreeConn(rconnout);
|
|
} else {
|
|
if (SendBootRepl(rmp, rconnout,
|
|
client? client->files: BootFiles))
|
|
AddConn(rconnout);
|
|
else
|
|
FreeConn(rconnout);
|
|
}
|
|
break;
|
|
|
|
case RMP_BOOT_REPL: /* boot reply (not valid) */
|
|
syslog(LOG_WARNING, "%s: sent a boot reply",
|
|
EnetStr(rconn));
|
|
break;
|
|
|
|
case RMP_READ_REQ: /* read request */
|
|
/*
|
|
* Send a portion of the boot file.
|
|
*/
|
|
(void) SendReadRepl(rconn);
|
|
break;
|
|
|
|
case RMP_READ_REPL: /* read reply (not valid) */
|
|
syslog(LOG_WARNING, "%s: sent a read reply",
|
|
EnetStr(rconn));
|
|
break;
|
|
|
|
case RMP_BOOT_DONE: /* boot complete */
|
|
/*
|
|
* Remove the entry from the linked list of active
|
|
* connections.
|
|
*/
|
|
(void) BootDone(rconn);
|
|
break;
|
|
|
|
default: /* unknown RMP packet type */
|
|
syslog(LOG_WARNING, "%s: unknown packet type (%u)",
|
|
EnetStr(rconn), rmp->r_type);
|
|
}
|
|
}
|
|
|
|
/*
|
|
** SendServerID -- send our host name to who ever requested it.
|
|
**
|
|
** Parameters:
|
|
** rconn - the reply packet to be formatted.
|
|
**
|
|
** Returns:
|
|
** 1 on success, 0 on failure.
|
|
**
|
|
** Side Effects:
|
|
** none.
|
|
*/
|
|
int
|
|
SendServerID(RMPCONN *rconn)
|
|
{
|
|
struct rmp_packet *rpl;
|
|
char *src, *dst;
|
|
u_int8_t *size;
|
|
|
|
rpl = &rconn->rmp; /* cache ptr to RMP packet */
|
|
|
|
/*
|
|
* Set up assorted fields in reply packet.
|
|
*/
|
|
rpl->r_brpl.rmp_type = RMP_BOOT_REPL;
|
|
rpl->r_brpl.rmp_retcode = RMP_E_OKAY;
|
|
ZEROWORD(rpl->r_brpl.rmp_seqno);
|
|
rpl->r_brpl.rmp_session = 0;
|
|
rpl->r_brpl.rmp_version = htons(RMP_VERSION);
|
|
|
|
size = &rpl->r_brpl.rmp_flnmsize; /* ptr to length of host name */
|
|
|
|
/*
|
|
* Copy our host name into the reply packet incrementing the
|
|
* length as we go. Stop at RMP_HOSTLEN or the first dot.
|
|
*/
|
|
src = MyHost;
|
|
dst = (char *) &rpl->r_brpl.rmp_flnm;
|
|
for (*size = 0; *size < RMP_HOSTLEN; (*size)++) {
|
|
if (*src == '.' || *src == '\0')
|
|
break;
|
|
*dst++ = *src++;
|
|
}
|
|
|
|
rconn->rmplen = RMPBOOTSIZE(*size); /* set packet length */
|
|
|
|
return(SendPacket(rconn)); /* send packet */
|
|
}
|
|
|
|
/*
|
|
** SendFileNo -- send the name of a bootable file to the requester.
|
|
**
|
|
** Parameters:
|
|
** req - RMP BOOT packet containing the request.
|
|
** rconn - the reply packet to be formatted.
|
|
** filelist - list of files available to the requester.
|
|
**
|
|
** Returns:
|
|
** 1 on success, 0 on failure.
|
|
**
|
|
** Side Effects:
|
|
** none.
|
|
*/
|
|
int
|
|
SendFileNo(struct rmp_packet *req, RMPCONN *rconn, char *filelist[])
|
|
{
|
|
struct rmp_packet *rpl;
|
|
char *src, *dst;
|
|
u_int8_t *size;
|
|
int i;
|
|
|
|
GETWORD(req->r_brpl.rmp_seqno, i); /* SeqNo is really FileNo */
|
|
rpl = &rconn->rmp; /* cache ptr to RMP packet */
|
|
|
|
/*
|
|
* Set up assorted fields in reply packet.
|
|
*/
|
|
rpl->r_brpl.rmp_type = RMP_BOOT_REPL;
|
|
PUTWORD(i, rpl->r_brpl.rmp_seqno);
|
|
i--;
|
|
rpl->r_brpl.rmp_session = 0;
|
|
rpl->r_brpl.rmp_version = htons(RMP_VERSION);
|
|
|
|
size = &rpl->r_brpl.rmp_flnmsize; /* ptr to length of filename */
|
|
*size = 0; /* init length to zero */
|
|
|
|
/*
|
|
* Copy the file name into the reply packet incrementing the
|
|
* length as we go. Stop at end of string or when RMPBOOTDATA
|
|
* characters have been copied. Also, set return code to
|
|
* indicate success or "no more files".
|
|
*/
|
|
if (i < C_MAXFILE && filelist[i] != NULL) {
|
|
src = filelist[i];
|
|
dst = (char *)&rpl->r_brpl.rmp_flnm;
|
|
for (; *src && *size < RMPBOOTDATA; (*size)++) {
|
|
if (*src == '\0')
|
|
break;
|
|
*dst++ = *src++;
|
|
}
|
|
rpl->r_brpl.rmp_retcode = RMP_E_OKAY;
|
|
} else
|
|
rpl->r_brpl.rmp_retcode = RMP_E_NODFLT;
|
|
|
|
rconn->rmplen = RMPBOOTSIZE(*size); /* set packet length */
|
|
|
|
return(SendPacket(rconn)); /* send packet */
|
|
}
|
|
|
|
/*
|
|
** SendBootRepl -- open boot file and respond to boot request.
|
|
**
|
|
** Parameters:
|
|
** req - RMP BOOT packet containing the request.
|
|
** rconn - the reply packet to be formatted.
|
|
** filelist - list of files available to the requester.
|
|
**
|
|
** Returns:
|
|
** 1 on success, 0 on failure.
|
|
**
|
|
** Side Effects:
|
|
** none.
|
|
*/
|
|
int
|
|
SendBootRepl(struct rmp_packet *req, RMPCONN *rconn, char *filelist[])
|
|
{
|
|
int retval;
|
|
char *filename, filepath[RMPBOOTDATA+1];
|
|
RMPCONN *oldconn;
|
|
struct rmp_packet *rpl;
|
|
char *src, *dst1, *dst2;
|
|
u_int8_t i;
|
|
|
|
/*
|
|
* If another connection already exists, delete it since we
|
|
* are obviously starting again.
|
|
*/
|
|
if ((oldconn = FindConn(rconn)) != NULL) {
|
|
syslog(LOG_WARNING, "%s: dropping existing connection",
|
|
EnetStr(oldconn));
|
|
RemoveConn(oldconn);
|
|
}
|
|
|
|
rpl = &rconn->rmp; /* cache ptr to RMP packet */
|
|
|
|
/*
|
|
* Set up assorted fields in reply packet.
|
|
*/
|
|
rpl->r_brpl.rmp_type = RMP_BOOT_REPL;
|
|
COPYWORD(req->r_brq.rmp_seqno, rpl->r_brpl.rmp_seqno);
|
|
rpl->r_brpl.rmp_session = htons(GenSessID());
|
|
rpl->r_brpl.rmp_version = htons(RMP_VERSION);
|
|
rpl->r_brpl.rmp_flnmsize = req->r_brq.rmp_flnmsize;
|
|
|
|
/*
|
|
* Copy file name to `filepath' string, and into reply packet.
|
|
*/
|
|
src = &req->r_brq.rmp_flnm;
|
|
dst1 = filepath;
|
|
dst2 = &rpl->r_brpl.rmp_flnm;
|
|
for (i = 0; i < req->r_brq.rmp_flnmsize; i++)
|
|
*dst1++ = *dst2++ = *src++;
|
|
*dst1 = '\0';
|
|
|
|
/*
|
|
* If we are booting HP-UX machines, their secondary loader will
|
|
* ask for files like "/hp-ux". As a security measure, we do not
|
|
* allow boot files to lay outside the boot directory (unless they
|
|
* are purposely link'd out. So, make `filename' become the path-
|
|
* stripped file name and spoof the client into thinking that it
|
|
* really got what it wanted.
|
|
*/
|
|
filename = (filename = strrchr(filepath,'/'))? ++filename: filepath;
|
|
|
|
/*
|
|
* Check that this is a valid boot file name.
|
|
*/
|
|
for (i = 0; i < C_MAXFILE && filelist[i] != NULL; i++)
|
|
if (STREQN(filename, filelist[i]))
|
|
goto match;
|
|
|
|
/*
|
|
* Invalid boot file name, set error and send reply packet.
|
|
*/
|
|
rpl->r_brpl.rmp_retcode = RMP_E_NOFILE;
|
|
retval = 0;
|
|
goto sendpkt;
|
|
|
|
match:
|
|
/*
|
|
* This is a valid boot file. Open the file and save the file
|
|
* descriptor associated with this connection and set success
|
|
* indication. If the file couldnt be opened, set error:
|
|
* "no such file or dir" - RMP_E_NOFILE
|
|
* "file table overflow" - RMP_E_BUSY
|
|
* "too many open files" - RMP_E_BUSY
|
|
* anything else - RMP_E_OPENFILE
|
|
*/
|
|
if ((rconn->bootfd = open(filename, O_RDONLY, 0600)) < 0) {
|
|
rpl->r_brpl.rmp_retcode = (errno == ENOENT)? RMP_E_NOFILE:
|
|
(errno == EMFILE || errno == ENFILE)? RMP_E_BUSY:
|
|
RMP_E_OPENFILE;
|
|
retval = 0;
|
|
} else {
|
|
rpl->r_brpl.rmp_retcode = RMP_E_OKAY;
|
|
retval = 1;
|
|
}
|
|
|
|
sendpkt:
|
|
syslog(LOG_INFO, "%s: request to boot %s (%s)",
|
|
EnetStr(rconn), filename, retval? "granted": "denied");
|
|
|
|
rconn->rmplen = RMPBOOTSIZE(rpl->r_brpl.rmp_flnmsize);
|
|
|
|
return (retval & SendPacket(rconn));
|
|
}
|
|
|
|
/*
|
|
** SendReadRepl -- send a portion of the boot file to the requester.
|
|
**
|
|
** Parameters:
|
|
** rconn - the reply packet to be formatted.
|
|
**
|
|
** Returns:
|
|
** 1 on success, 0 on failure.
|
|
**
|
|
** Side Effects:
|
|
** none.
|
|
*/
|
|
int
|
|
SendReadRepl(RMPCONN *rconn)
|
|
{
|
|
int retval = 0;
|
|
RMPCONN *oldconn;
|
|
struct rmp_packet *rpl, *req;
|
|
int size = 0;
|
|
int madeconn = 0;
|
|
|
|
/*
|
|
* Find the old connection. If one doesnt exist, create one only
|
|
* to return the error code.
|
|
*/
|
|
if ((oldconn = FindConn(rconn)) == NULL) {
|
|
if ((oldconn = NewConn(rconn)) == NULL)
|
|
return(0);
|
|
syslog(LOG_ERR, "SendReadRepl: no active connection (%s)",
|
|
EnetStr(rconn));
|
|
madeconn++;
|
|
}
|
|
|
|
req = &rconn->rmp; /* cache ptr to request packet */
|
|
rpl = &oldconn->rmp; /* cache ptr to reply packet */
|
|
|
|
if (madeconn) { /* no active connection above; abort */
|
|
rpl->r_rrpl.rmp_retcode = RMP_E_ABORT;
|
|
retval = 1;
|
|
goto sendpkt;
|
|
}
|
|
|
|
/*
|
|
* Make sure Session ID's match.
|
|
*/
|
|
if (ntohs(req->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, "SendReadRepl: bad session id (%s)",
|
|
EnetStr(rconn));
|
|
rpl->r_rrpl.rmp_retcode = RMP_E_BADSID;
|
|
retval = 1;
|
|
goto sendpkt;
|
|
}
|
|
|
|
/*
|
|
* If the requester asks for more data than we can fit,
|
|
* silently clamp the request size down to RMPREADDATA.
|
|
*
|
|
* N.B. I do not know if this is "legal", however it seems
|
|
* to work. This is necessary for bpfwrite() on machines
|
|
* with MCLBYTES less than 1514.
|
|
*/
|
|
if (ntohs(req->r_rrq.rmp_size) > RMPREADDATA)
|
|
req->r_rrq.rmp_size = htons(RMPREADDATA);
|
|
|
|
/*
|
|
* Position read head on file according to info in request packet.
|
|
*/
|
|
GETWORD(req->r_rrq.rmp_offset, size);
|
|
if (lseek(oldconn->bootfd, (off_t)size, SEEK_SET) < 0) {
|
|
syslog(LOG_ERR, "SendReadRepl: lseek: %m (%s)",
|
|
EnetStr(rconn));
|
|
rpl->r_rrpl.rmp_retcode = RMP_E_ABORT;
|
|
retval = 1;
|
|
goto sendpkt;
|
|
}
|
|
|
|
/*
|
|
* Read data directly into reply packet.
|
|
*/
|
|
if ((size = read(oldconn->bootfd, &rpl->r_rrpl.rmp_data,
|
|
(int) ntohs(req->r_rrq.rmp_size))) <= 0) {
|
|
if (size < 0) {
|
|
syslog(LOG_ERR, "SendReadRepl: read: %m (%s)",
|
|
EnetStr(rconn));
|
|
rpl->r_rrpl.rmp_retcode = RMP_E_ABORT;
|
|
} else {
|
|
rpl->r_rrpl.rmp_retcode = RMP_E_EOF;
|
|
}
|
|
retval = 1;
|
|
goto sendpkt;
|
|
}
|
|
|
|
/*
|
|
* Set success indication.
|
|
*/
|
|
rpl->r_rrpl.rmp_retcode = RMP_E_OKAY;
|
|
|
|
sendpkt:
|
|
/*
|
|
* Set up assorted fields in reply packet.
|
|
*/
|
|
rpl->r_rrpl.rmp_type = RMP_READ_REPL;
|
|
COPYWORD(req->r_rrq.rmp_offset, rpl->r_rrpl.rmp_offset);
|
|
rpl->r_rrpl.rmp_session = req->r_rrq.rmp_session;
|
|
|
|
oldconn->rmplen = RMPREADSIZE(size); /* set size of packet */
|
|
|
|
retval &= SendPacket(oldconn); /* send packet */
|
|
|
|
if (madeconn) /* clean up after ourself */
|
|
FreeConn(oldconn);
|
|
|
|
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 cant 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, (struct timezone *)0);
|
|
|
|
if (DbgFp != NULL) /* display packet */
|
|
DispPkt(rconn,DIR_SENT);
|
|
|
|
/*
|
|
* Send RMP packet to remote host.
|
|
*/
|
|
return(BpfWrite(rconn));
|
|
}
|