1 files changed, 92 insertions, 0 deletions

diff --git a/src/dyndns-command.sh b/src/dyndns-command.sh
new file mode 100755
index 0000000..375d50b
--- /dev/null
+++ b/src/dyndns-command.sh
@@ -0,0 +1,92 @@
+#!/bin/bash
+
+die() { printf '%s\n' "$*" >&2; exit 1; }
+
+sql_string()
+{
+        printf '%s' "'${1//\'/\'\'}'"
+}
+
+powerdns_sqlite_add_replace_record()
+{
+        local sql_new_domain="$(sql_string "$1.$3")"
+        local sql_ip_address="$(sql_string "$2")"
+        local sql_domain="$(sql_string "$3")"
+        local record_type="$(sql_string "$4")"
+
+        DBDIR=/etc/powerdns
+        DBNAME=powerdns.sqlite3
+        DB=$DBDIR/$DBNAME
+
+        test -r $DB    && test -w $DB    || die "Wrong permissions on $DB"
+        test -r $DBDIR && test -w $DBDIR || die "Wrong permissions on $DBDIR"
+
+        sqlite3 $DB <<END
+${SQL_ECHO:+.echo on}
+BEGIN;
+        DELETE FROM records WHERE type=$record_type AND name=$sql_new_domain;
+
+        INSERT INTO records
+
+                (domain_id,
+                name,
+                type,
+                content,
+                ttl,
+                prio)
+
+                SELECT
+                        id,
+                        $sql_new_domain,
+                        $record_type,
+                        $sql_ip_address,
+                        3600,
+                        0
+                FROM domains
+                WHERE name=$sql_domain;
+COMMIT;
+END
+}
+
+add()
+{
+        local record_type
+        case "$2" in
+                *.*.*.*) record_type=A ;;
+                *:*) record_type=AAAA ;;
+                *) exit 1 ;;
+        esac
+
+        powerdns_sqlite_add_replace_record "$1" "$2" "$domain" "$record_type" \
+        && printf '%s %s\n' "$1.$domain $2"
+}
+
+main()
+{
+        add "$subdomain" "$ip_address"
+
+        set -- $SSH_ORIGINAL_COMMAND
+        while [ $# -ge 2 ]; do
+                d=$1
+                ip=$2
+                shift 2
+
+                case "$d" in
+                        *.*) continue;;
+                esac
+
+                add "$d.$subdomain" "$ip"
+        done
+}
+
+PEM_DEST=$HOME/public_rsync
+
+PATH=$HOME/bin:$PATH
+
+eval "$(samizdat-ssh-uid --copy-pem "$PEM_DEST")"
+
+domain=${SSH_CLIENT_DOMAIN}
+subdomain=${SSH_CLIENT_FINGERPRINT}
+ip_address=${SSH_CLIENT%% *}
+
+main "$@"