Re: [9fans] Small patch to tftpd; command line announce strings.

[geoff@collyer.net]

Listen doesn't need a -x; its last argument is the network directory
to use:

	aux/listen -t /bin/service.auth -d /bin/service.alt /net.alt/tcp

Initialising additional interfaces isn't conveniently packaged up, so
I wrote `ifup', which does the job.  I use it like this in cpurc:

# network services
aux/listen -q -t /bin/service.auth -d /bin/service tcp
ip/tftpd
ip/dhcpd
# alternate interfaces & their services
switch ($sysname) {
case cpu
	ifup alt 1 $sysname	external service.alt
	ifup gig 2 $sysname-gig	local	 service
	timesync /net.alt/udp!^((ntp1 ntp2)^.mainecoon.com openbsd)
case cpub
	ifup alt 1 $sysname external service.alt
case cpuc
	ifup gig 1 $sysname-gig local service
}

The first interface (/net) is handled specially; it often is already
configured when cpurc starts.

This is ifup:
---
#!/bin/rc
# ifup mtsfx etherno sysnm ndbfile svcdir - configure /net.$mtsfx
# TODO: share a protocol stack between ether0 and gig ether
#	and just add a route to the other gig host
if (! ~ $#* 5) {
	echo usage: $0 mtsfx etherno sysnm ndbfile svcdir
	exit usage
}
rfork e
mtsfx=$1	etherno=$2	sysnm=$3	ndbfile=$4	svcdir=$5
mtpt=/net.^$mtsfx
ndbf=/lib/ndb/^$ndbfile

# merge protocol stack and ethernet interface at mount point
bind -b '#l'^$etherno $mtpt
bind -b '#I'^$etherno $mtpt

# figure out ip, ipgw & ipmask
ipgw=dummy			# in case ndb doesn't list one
for (attr in ip ipgw ipmask)
	eval `{ndb/ipquery -f $ndbf sys $sysnm $attr | tr ' ' '\12' | sed 1q}

# configure interface and set up out-calling machinery
# first arg can be "ether" or "gbe" iff it can handle jumbo packets
ip/ipconfig -x .$mtsfx -g $ipgw ether $mtpt/ether$etherno $ip $ipmask
ndb/cs -x $mtpt -f $ndbf
if (! ~ $mtsfx gig)
 	ndb/dns -sx $mtpt -f $ndbf

# start up listeners
aux/listen -t /bin/service.auth -d /bin/^$svcdir $mtpt^/tcp
if (! ~ $mtsfx gig) {
	ip/dhcpd -x $mtpt -f $ndbf	# for the printer
	ip/rip -x $mtpt
}
if (~ $mtsfx alt)
	auth/secstored -x $mtpt
---