From 0d70aefb72bcef186cd73cb506be8197f740977d Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Fri, 29 May 2020 07:20:52 -0400
Subject: initial commit

---
 dyndns-command.sh | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100755 dyndns-command.sh

(limited to 'dyndns-command.sh')

diff --git a/dyndns-command.sh b/dyndns-command.sh
new file mode 100755
index 0000000..375d50b
--- /dev/null
+++ b/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=${SSH_CLIENT%% *}
+
+main "$@"
-- 
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