+/*
+ * Copyright (c) 1992 Regents of the University of California.
+ * Copyright (c) 1988, 1992 The University of Utah and the Center
+ * for Software Science (CSS).
+ * 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.
+ *
+ * %sccs.include.redist.c%
+ *
+ * @(#)rmpproto.c 5.1 (Berkeley) %G%
+ *
+ * Utah $Hdr: rmpproto.c 3.1 92/07/06$
+ * Author: Jeff Forys, University of Utah CSS
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)rmpproto.c 5.1 (Berkeley) %G%";
+#endif /* not lint */
+
+#include "defs.h"
+
+#include <sys/file.h>
+
+#include <strings.h>
+#include <syslog.h>
+#include <errno.h>
+
+extern int errno;
+
+/*
+** 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.
+*/
+
+ProcessPacket(rconn, client)
+RMPCONN *rconn;
+CLIENT *client;
+{
+ int SendServerID(), SendFileNo(), SendBootRepl();
+ int SendReadRepl(), BootDone();
+ RMPCONN *rconnout, *NewConn();
+ struct rmp_packet *rmp;
+
+ 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 (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(rconn)
+RMPCONN *rconn;
+{
+ int SendPacket();
+ register struct rmp_packet *rpl;
+ register char *src, *dst;
+ register u_char *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 = 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(req,rconn,filelist)
+struct rmp_packet *req;
+RMPCONN *rconn;
+char *filelist[];
+{
+ int SendPacket();
+ register struct rmp_packet *rpl;
+ register char *src, *dst;
+ register u_char *size, 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 = 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.
+*/
+
+SendBootRepl(req,rconn,filelist)
+struct rmp_packet *req;
+RMPCONN *rconn;
+char *filelist[];
+{
+ int retval, SendPacket();
+ char *filename, filepath[RMPBOOTDATA+1];
+ RMPCONN *oldconn, *FindConn();
+ register struct rmp_packet *rpl;
+ register char *src, *dst1, *dst2;
+ register u_char 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 = GenSessID();
+ rpl->r_brpl.rmp_version = 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 = rindex(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(rconn)
+RMPCONN *rconn;
+{
+ off_t lseek();
+ int retval, SendPacket();
+ RMPCONN *oldconn, *FindConn(), *NewConn();
+ register struct rmp_packet *rpl, *req;
+ register 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 (req->r_rrq.rmp_session !=
+ ((rpl->r_type == RMP_BOOT_REPL)? rpl->r_brpl.rmp_session:
+ 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 (req->r_rrq.rmp_size > RMPREADDATA)
+ req->r_rrq.rmp_size = 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, L_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) 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(rconn)
+RMPCONN *rconn;
+{
+ RMPCONN *oldconn, *FindConn();
+ 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 (rconn->rmp.r_rrq.rmp_session !=
+ ((rpl->r_type == RMP_BOOT_REPL)? rpl->r_brpl.rmp_session:
+ 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(rconn)
+register RMPCONN *rconn;
+{
+ /*
+ * Set Ethernet Destination address to Source (BPF and the enet
+ * driver will take care of getting our source address set).
+ */
+ bcopy((char *)&rconn->rmp.hp_hdr.saddr[0],
+ (char *)&rconn->rmp.hp_hdr.daddr[0], RMP_ADDRLEN);
+ rconn->rmp.hp_hdr.len = rconn->rmplen - sizeof(struct hp_hdr);
+
+ /*
+ * Reverse 802.2/HP Extended Source & Destination Access Pts.
+ */
+ rconn->rmp.hp_llc.dxsap = HPEXT_SXSAP;
+ rconn->rmp.hp_llc.sxsap = 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));
+}
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