[feat] Add functions for input validation

salt/common/tools/sbin/so-common

@@ -233,6 +233,89 @@ __check_apt_lock() {
 	return $lock
 }
 
+valid_cidr() {
+	# Verify there is a backslash in the string
+	echo "$1" | grep -qP "^[^/]+/[^/]+$" || return 1
+	
+	local cidr
+	local ip
+
+	cidr=$(echo "$1" | sed 's/.*\///')
+	ip=$(echo "$1" | sed 's/\/.*//' )
+	
+	if valid_ip4 "$ip"; then
+		[[ $cidr =~ ([0-9]|[1-2][0-9]|3[0-2]) ]] && return 0 || return 1
+	else
+		return 1
+	fi
+}
+
+valid_cidr_list() {
+	local all_valid=0
+
+	IFS="," read -r -a net_arr <<< "$1"
+
+	for net in "${net_arr[@]}"; do
+		valid_cidr "$net" || all_valid=1
+	done
+
+	return $all_valid
+}
+
+valid_dns_list() {
+	local all_valid=0
+
+	read -r -a dns_arr <<< "$1"
+
+	for addr in "${dns_arr[@]}"; do
+		valid_ip4 "$addr" || all_valid=1
+	done
+
+	return $all_valid
+}
+
+valid_fqdn() {
+	local fqdn=$1
+
+	echo "$fqdn" | grep -qP '(?=^.{4,253}$)(^((?!-)[a-zA-Z0-9-]{0,62}[a-zA-Z0-9]\.)+[a-zA-Z]{2,63}$)' \
+		&& return 0 \
+		|| return 1
+}
+
+valid_hostname() {
+	local hostname=$1
+
+ [[ $hostname =~ ^[a-zA-Z0-9\-]+$ ]] && [[ $hostname != 'localhost' ]] && return 0 || return 1
+}
+
+valid_ip4() {
+	local ip=$1
+
+	echo "$ip" | grep -qP '^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$' && return 0 || return 1
+}
+
+valid_int() {
+	local num=$1
+	local min=${2:-1}
+	local max=${3:-1000}
+
+	[[ $num =~ ^[0-9]*$ ]] && [[ $num -ge $min ]] && [[ $num -le $max ]] && return 0 || return 1
+}
+
+valid_string() {
+	local str=$1
+	local min_length=${2:-1}
+	local max_length=${3:-64}
+
+	echo "$str" | grep -qP '^\S+$' && [[ ${#str} -ge $min_length ]] && [[ ${#str} -le $max_length ]] && return 0 || return 1
+}
+
+valid_username() {
+	local user=$1
+
+	echo "$user" | grep -qP '^[a-z_]([a-z0-9_-]{0,31}|[a-z0-9_-]{0,30}\$)$' && return 0 || return 1
+}
+
 wait_for_web_response() {
 	url=$1
 	expected=$2