6 ## Check that the environment is set up properly.
7 for i
in DYNDNS_ZONE DYNDNS_HOST DYNDNS_SERVER DYNDNS_KEY SSH_CLIENT
; do
8 eval havep
=\
${$i+t}\
${$i-nil}
9 case $havep in nil
) echo >&2 "$0: variable $i unset"; exit 2 ;; esac
12 ## Find the client address. This may be useful.
13 set -- $SSH_CLIENT; client
=$1
15 ## Parse the commad line.
16 set -- $SSH_ORIGINAL_COMMAND
20 usage: $0 COMMAND ARGS...
23 set [-force] HOST [ADDR]
28 getarg
='case $# in 0) fail_usage ;; esac; arg=$1; shift'
29 doneargs
='case $# in 0) ;; *) fail_usage ;; esac'
35 *..
* | .
* |
*. |
*[!-_.a-zA-Z0-9
]*)
36 echo >&2 "$0: invalid hostname"
42 for pat
in $DYNDNS_HOST; do
43 case "$host" in $pat) matchp
=t
;; esac
45 case $matchp in nil
) echo >&2 "$0: hostname not permitted"; exit 2 ;; esac
51 nsupdate
-k
"$DYNDNS_KEY" <<EOF
59 eval $getarg; cmd
=$arg
64 case "$arg" in -force
) forcep
=t
; eval $getarg ;; esac
66 case "$#,$forcep,$1" in
67 0,nil
,*) addr
=$client ;;
69 *,nil
,"$client" |
*,t
,*) addr
=$1; shift ;;
71 echo >&2 "$0: incorrect address (wanted = $2; found = $addr)"
80 *) echo >&2 "$0: failed to parse new address"; exit 2 ;;
82 name
=$host.
$DYNDNS_ZONE
84 update delete $name IN $rrtype
85 update add $name ${DYNDNS_TTL-14400} IN $rrtype $addr"
88 eval $getarg; host=$arg
91 name
=$host.
$DYNDNS_ZONE
92 doupdate
"update delete $name IN"