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Make the man page reflect reality. Add BUGS section about DNS.

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Logging cleanups (including logging the requestor's MAC address instead
 of the server's).
This commit is contained in:
Bill Fenner 1996-11-27 20:42:09 +00:00
parent 735fa92ade
commit b60287db00
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=19985
2 changed files with 28 additions and 16 deletions
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20
usr.sbin/rarpd/rarpd.8
View File

@ -1,4 +1,4 @@
.\" @(#) $Header: rarpd.8,v 1.3 93/07/19 19:34:24 leres Exp $ (LBL)
.\" @(#) $Header: /home/ncvs/src/usr.sbin/rarpd/rarpd.8,v 1.4 1996/11/19 23:57:05 wpaul Exp $ (LBL)
.\"
.\" Copyright (c) 1990, 1991, 1993 The Regents of the University of
.\" California. All rights reserved.
@ -39,21 +39,24 @@ rarpd \- Reverse ARP Daemon
services Reverse ARP requests on the Ethernet connected to
.I interface.
Upon receiving a request,
.Irarpd
.I rarpd
maps the target hardware address to an IP address via its name, which
must be present in both the
.I ethers(5)
and
.I hosts(5)
databases.
If a host does not exist in both databses, the translation cannot
If a host does not exist in both databases, the translation cannot
proceed and a reply will not be sent.
Additionally, a request is honored only if the server
(i.e., the host that rarpd is running on)
can "boot" the target; that is, if the directory
/tftpboot/\fIipaddr\fP
exists, where \fIipaddr\fP is the target IP address.
can "boot" the target; that is, a file or directory matching the glob
/tftpboot/\fIipaddr\fP*
exists, where \fIipaddr\fP is the target IP address in hex.
For example, the IP address 204.216.27.18 will be replied to if any of
/tftpboot/CCD81B12, /tftpboot/CCD81B12.SUN3, or /tftpboot/CCD81B12-boot
exist.
In normal operation,
.I rarpd
@ -90,3 +93,8 @@ Craig Leres (leres@ee.lbl.gov) and
Steven McCanne (mccanne@ee.lbl.gov).
Lawrence Berkeley Laboratory, University of California, Berkeley, CA.
.SH BUGS
.I rarpd
can depend on the DNS to resolve the name discovered from /etc/ethers.
If this name is not in the DNS but is in /etc/hosts, the DNS lookup
can cause a delayed RARP response, so in this situation it is reccommended to
configure /etc/host.conf to read /etc/hosts first.

24
usr.sbin/rarpd/rarpd.c
View File

@ -26,7 +26,7 @@ The Regents of the University of California. All rights reserved.\n";
#ifndef lint
static const char rcsid[] =
"@(#) $Header: rarpd.c,v 1.22 96/06/14 20:40:14 leres Exp $ (LBL)";
"@(#) $Header: /home/ncvs/src/usr.sbin/rarpd/rarpd.c,v 1.10 1996/11/19 23:57:06 wpaul Exp $ (LBL)";
#endif
/*
@ -406,7 +406,7 @@ init(target)
void
usage()
{
(void)fprintf(stderr, "usage: rarpd [ -afv ] [ interface ]\n");
(void)fprintf(stderr, "usage: rarpd [ -afnv ] [ interface ]\n");
exit(1);
}
@ -508,10 +508,8 @@ rarp_check(p, len)
struct ether_arp *ap = (struct ether_arp *)(p + sizeof(*ep));
if (len < sizeof(*ep) + sizeof(*ap)) {
syslog(LOG_ERR, "truncated request");
#ifdef DEBUG
printf ("len: %d expected: %d\n", len, sizeof(*ep) + sizeof(*ap));
#endif
syslog(LOG_ERR, "truncated request, got %d, expected %d",
len, sizeof(*ep) + sizeof(*ap));
return 0;
}
/*
@ -624,7 +622,7 @@ rarp_loop()
caplen = bhp->bh_caplen;
hdrlen = bhp->bh_hdrlen;
if (rarp_check(bp + hdrlen, caplen))
rarp_process(ii, bp + hdrlen, cc);
rarp_process(ii, bp + hdrlen, caplen);
bp += BPF_WORDALIGN(hdrlen + caplen);
}
}
@ -709,11 +707,17 @@ rarp_process(ii, pkt, len)
ep = (struct ether_header *)pkt;
/* should this be arp_tha? */
if (ether_ntohost(ename, &ep->ether_shost) != 0)
if (ether_ntohost(ename, &ep->ether_shost) != 0) {
syslog(LOG_ERR, "cannot map %s to name",
eatoa(ep->ether_shost));
return;
}
if((hp = gethostbyname(ename)) == NULL)
if ((hp = gethostbyname(ename)) == NULL) {
syslog(LOG_ERR, "cannot map %s to IP address", ename);
return;
}
/*
* Choose correct address from list.
*/
@ -943,7 +947,7 @@ rarp_reply(ii, ep, ipaddr, len)
syslog(LOG_ERR, "write: only %d of %d bytes written", n, len);
if (verbose)
syslog(LOG_INFO, "%s %s at %s REPLIED", ii->ii_ifname,
eatoa(ap->arp_sha),
eatoa(ap->arp_tha),
intoa(ntohl(ipaddr)));
}