diff options
Diffstat (limited to 'src')
-rwxr-xr-x | src/get-dyndns-name | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/get-dyndns-name b/src/get-dyndns-name new file mode 100755 index 0000000..7ef8c1b --- /dev/null +++ b/src/get-dyndns-name | |||
@@ -0,0 +1,67 @@ | |||
1 | #!/bin/sh | ||
2 | set -e | ||
3 | |||
4 | DEFAULT_AUTH_TYPE=ed25519 | ||
5 | |||
6 | in_group() | ||
7 | { | ||
8 | local g | ||
9 | for g in $(groups) | ||
10 | do | ||
11 | [ "$g" = "$1" ] && return | ||
12 | done | ||
13 | false | ||
14 | } | ||
15 | |||
16 | ssh_keytag_to_path_fragment() | ||
17 | { | ||
18 | case "$1" in | ||
19 | ssh-dss) echo dsa ;; | ||
20 | ecdsa-sha2-nistp256) echo ecdsa ;; | ||
21 | ssh-rsa|ssh-ed25519) echo ${1#ssh-} ;; | ||
22 | *) return 1 ;; | ||
23 | esac | ||
24 | } | ||
25 | |||
26 | path_fragment_to_ssh_keytag() | ||
27 | { | ||
28 | case "$1" in | ||
29 | ssh-dss|ecdsa-sha2-nistp256|ssh-rsa|ssh-ed25519) echo $1;; | ||
30 | dss|rsa|ed25519) echo ssh-$1 ;; | ||
31 | dsa) echo ssh-dss ;; | ||
32 | ecdsa) echo ecdsa-sha2-nistp256 ;; | ||
33 | *) return 1 ;; | ||
34 | esac | ||
35 | } | ||
36 | |||
37 | get_dyndns_domain() | ||
38 | { | ||
39 | fragment=$(ssh_keytag_to_path_fragment "$1") || return | ||
40 | |||
41 | host_keyfile=/etc/ssh/ssh_host_${fragment}_key | ||
42 | user_keyfile=$HOME/.ssh/id_${fragment} | ||
43 | |||
44 | set -- -q dyndns@cryptonomic.net | ||
45 | |||
46 | if [ -r "$host_keyfile" ] | ||
47 | then | ||
48 | set -- ssh -i "$host_keyfile" "$@" | ||
49 | |||
50 | elif in_group sudo | ||
51 | then | ||
52 | set -- sudo ssh -i "$host_keyfile" "$@" | ||
53 | |||
54 | elif [ -r "$user_keyfile" ] | ||
55 | then | ||
56 | set -- ssh -i "$user_keyfile" "$@" | ||
57 | |||
58 | else | ||
59 | set -- ssh "$@" | ||
60 | fi | ||
61 | |||
62 | "$@" | ||
63 | } | ||
64 | |||
65 | AUTH_TYPE=${1:-$DEFAULT_AUTH_TYPE} | ||
66 | AUTH_KEYTAG=$(path_fragment_to_ssh_keytag "$AUTH_TYPE") | ||
67 | get_dyndns_domain "$AUTH_KEYTAG" | ||