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resource_cloudstack_firewall.go
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resource_cloudstack_firewall.go
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package cloudstack
import (
"bytes"
"fmt"
"regexp"
"sort"
"strconv"
"strings"
"github.com/hashicorp/terraform/helper/hashcode"
"github.com/hashicorp/terraform/helper/schema"
"github.com/xanzy/go-cloudstack/cloudstack"
)
func resourceCloudStackFirewall() *schema.Resource {
return &schema.Resource{
Create: resourceCloudStackFirewallCreate,
Read: resourceCloudStackFirewallRead,
Update: resourceCloudStackFirewallUpdate,
Delete: resourceCloudStackFirewallDelete,
Schema: map[string]*schema.Schema{
"ipaddress": &schema.Schema{
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
"managed": &schema.Schema{
Type: schema.TypeBool,
Optional: true,
Default: false,
},
"rule": &schema.Schema{
Type: schema.TypeSet,
Optional: true,
Elem: &schema.Resource{
Schema: map[string]*schema.Schema{
"source_cidr": &schema.Schema{
Type: schema.TypeString,
Required: true,
},
"protocol": &schema.Schema{
Type: schema.TypeString,
Required: true,
},
"icmp_type": &schema.Schema{
Type: schema.TypeInt,
Optional: true,
Computed: true,
},
"icmp_code": &schema.Schema{
Type: schema.TypeInt,
Optional: true,
Computed: true,
},
"ports": &schema.Schema{
Type: schema.TypeSet,
Optional: true,
Elem: &schema.Schema{Type: schema.TypeString},
Set: func(v interface{}) int {
return hashcode.String(v.(string))
},
},
"uuids": &schema.Schema{
Type: schema.TypeMap,
Computed: true,
},
},
},
Set: resourceCloudStackFirewallRuleHash,
},
},
}
}
func resourceCloudStackFirewallCreate(d *schema.ResourceData, meta interface{}) error {
cs := meta.(*cloudstack.CloudStackClient)
// Make sure all required parameters are there
if err := verifyFirewallParams(d); err != nil {
return err
}
// Retrieve the ipaddress UUID
ipaddressid, e := retrieveUUID(cs, "ipaddress", d.Get("ipaddress").(string))
if e != nil {
return e.Error()
}
// We need to set this upfront in order to be able to save a partial state
d.SetId(ipaddressid)
// Create all rules that are configured
if rs := d.Get("rule").(*schema.Set); rs.Len() > 0 {
// Create an empty schema.Set to hold all rules
rules := &schema.Set{
F: resourceCloudStackFirewallRuleHash,
}
for _, rule := range rs.List() {
// Create a single rule
err := resourceCloudStackFirewallCreateRule(d, meta, rule.(map[string]interface{}))
// We need to update this first to preserve the correct state
rules.Add(rule)
d.Set("rule", rules)
if err != nil {
return err
}
}
}
return resourceCloudStackFirewallRead(d, meta)
}
func resourceCloudStackFirewallCreateRule(
d *schema.ResourceData, meta interface{}, rule map[string]interface{}) error {
cs := meta.(*cloudstack.CloudStackClient)
uuids := rule["uuids"].(map[string]interface{})
// Make sure all required rule parameters are there
if err := verifyFirewallRuleParams(d, rule); err != nil {
return err
}
// Create a new parameter struct
p := cs.Firewall.NewCreateFirewallRuleParams(d.Id(), rule["protocol"].(string))
// Set the CIDR list
p.SetCidrlist([]string{rule["source_cidr"].(string)})
// If the protocol is ICMP set the needed ICMP parameters
if rule["protocol"].(string) == "icmp" {
p.SetIcmptype(rule["icmp_type"].(int))
p.SetIcmpcode(rule["icmp_code"].(int))
r, err := cs.Firewall.CreateFirewallRule(p)
if err != nil {
return err
}
uuids["icmp"] = r.Id
rule["uuids"] = uuids
}
// If protocol is not ICMP, loop through all ports
if rule["protocol"].(string) != "icmp" {
if ps := rule["ports"].(*schema.Set); ps.Len() > 0 {
// Create an empty schema.Set to hold all processed ports
ports := &schema.Set{
F: func(v interface{}) int {
return hashcode.String(v.(string))
},
}
for _, port := range ps.List() {
re := regexp.MustCompile(`^(\d+)(?:-(\d+))?$`)
m := re.FindStringSubmatch(port.(string))
startPort, err := strconv.Atoi(m[1])
if err != nil {
return err
}
endPort := startPort
if m[2] != "" {
endPort, err = strconv.Atoi(m[2])
if err != nil {
return err
}
}
p.SetStartport(startPort)
p.SetEndport(endPort)
r, err := cs.Firewall.CreateFirewallRule(p)
if err != nil {
return err
}
ports.Add(port)
rule["ports"] = ports
uuids[port.(string)] = r.Id
rule["uuids"] = uuids
}
}
}
return nil
}
func resourceCloudStackFirewallRead(d *schema.ResourceData, meta interface{}) error {
cs := meta.(*cloudstack.CloudStackClient)
// Create an empty schema.Set to hold all rules
rules := &schema.Set{
F: resourceCloudStackFirewallRuleHash,
}
// Read all rules that are configured
if rs := d.Get("rule").(*schema.Set); rs.Len() > 0 {
for _, rule := range rs.List() {
rule := rule.(map[string]interface{})
uuids := rule["uuids"].(map[string]interface{})
if rule["protocol"].(string) == "icmp" {
id, ok := uuids["icmp"]
if !ok {
continue
}
// Get the rule
r, count, err := cs.Firewall.GetFirewallRuleByID(id.(string))
// If the count == 0, there is no object found for this UUID
if err != nil {
if count == 0 {
delete(uuids, "icmp")
continue
}
return err
}
// Update the values
rule["source_cidr"] = r.Cidrlist
rule["protocol"] = r.Protocol
rule["icmp_type"] = r.Icmptype
rule["icmp_code"] = r.Icmpcode
rules.Add(rule)
}
// If protocol is not ICMP, loop through all ports
if rule["protocol"].(string) != "icmp" {
if ps := rule["ports"].(*schema.Set); ps.Len() > 0 {
// Create an empty schema.Set to hold all ports
ports := &schema.Set{
F: func(v interface{}) int {
return hashcode.String(v.(string))
},
}
// Loop through all ports and retrieve their info
for _, port := range ps.List() {
id, ok := uuids[port.(string)]
if !ok {
continue
}
// Get the rule
r, count, err := cs.Firewall.GetFirewallRuleByID(id.(string))
if err != nil {
if count == 0 {
delete(uuids, port.(string))
continue
}
return err
}
// Update the values
rule["source_cidr"] = r.Cidrlist
rule["protocol"] = r.Protocol
ports.Add(port)
}
// If there is at least one port found, add this rule to the rules set
if ports.Len() > 0 {
rule["ports"] = ports
rules.Add(rule)
}
}
}
}
}
// If this is a managed firewall, add all unknown rules into a single dummy rule
managed := d.Get("managed").(bool)
if managed {
// Get all the rules from the running environment
p := cs.Firewall.NewListFirewallRulesParams()
p.SetIpaddressid(d.Id())
p.SetListall(true)
r, err := cs.Firewall.ListFirewallRules(p)
if err != nil {
return err
}
// Add all UUIDs to the uuids map
uuids := make(map[string]interface{}, len(r.FirewallRules))
for _, r := range r.FirewallRules {
uuids[r.Id] = r.Id
}
// Delete all expected UUIDs from the uuids map
for _, rule := range rules.List() {
rule := rule.(map[string]interface{})
for _, id := range rule["uuids"].(map[string]interface{}) {
delete(uuids, id.(string))
}
}
if len(uuids) > 0 {
// Make a dummy rule to hold all unknown UUIDs
rule := map[string]interface{}{
"source_cidr": "N/A",
"protocol": "N/A",
"uuids": uuids,
}
// Add the dummy rule to the rules set
rules.Add(rule)
}
}
if rules.Len() > 0 {
d.Set("rule", rules)
} else if !managed {
d.SetId("")
}
return nil
}
func resourceCloudStackFirewallUpdate(d *schema.ResourceData, meta interface{}) error {
// Make sure all required parameters are there
if err := verifyFirewallParams(d); err != nil {
return err
}
// Check if the rule set as a whole has changed
if d.HasChange("rule") {
o, n := d.GetChange("rule")
ors := o.(*schema.Set).Difference(n.(*schema.Set))
nrs := n.(*schema.Set).Difference(o.(*schema.Set))
// Now first loop through all the old rules and delete any obsolete ones
for _, rule := range ors.List() {
// Delete the rule as it no longer exists in the config
err := resourceCloudStackFirewallDeleteRule(d, meta, rule.(map[string]interface{}))
if err != nil {
return err
}
}
// Make sure we save the state of the currently configured rules
rules := o.(*schema.Set).Intersection(n.(*schema.Set))
d.Set("rule", rules)
// Then loop through all the currently configured rules and create the new ones
for _, rule := range nrs.List() {
// When succesfully deleted, re-create it again if it still exists
err := resourceCloudStackFirewallCreateRule(
d, meta, rule.(map[string]interface{}))
// We need to update this first to preserve the correct state
rules.Add(rule)
d.Set("rule", rules)
if err != nil {
return err
}
}
}
return resourceCloudStackFirewallRead(d, meta)
}
func resourceCloudStackFirewallDelete(d *schema.ResourceData, meta interface{}) error {
// Delete all rules
if rs := d.Get("rule").(*schema.Set); rs.Len() > 0 {
for _, rule := range rs.List() {
// Delete a single rule
err := resourceCloudStackFirewallDeleteRule(d, meta, rule.(map[string]interface{}))
// We need to update this first to preserve the correct state
d.Set("rule", rs)
if err != nil {
return err
}
}
}
return nil
}
func resourceCloudStackFirewallDeleteRule(
d *schema.ResourceData, meta interface{}, rule map[string]interface{}) error {
cs := meta.(*cloudstack.CloudStackClient)
uuids := rule["uuids"].(map[string]interface{})
for k, id := range uuids {
// We don't care about the count here, so just continue
if k == "#" {
continue
}
// Create the parameter struct
p := cs.Firewall.NewDeleteFirewallRuleParams(id.(string))
// Delete the rule
if _, err := cs.Firewall.DeleteFirewallRule(p); err != nil {
// This is a very poor way to be told the UUID does no longer exist :(
if strings.Contains(err.Error(), fmt.Sprintf(
"Invalid parameter id value=%s due to incorrect long value format, "+
"or entity does not exist", id.(string))) {
delete(uuids, k)
continue
}
return err
}
// Delete the UUID of this rule
delete(uuids, k)
}
// Update the UUIDs
rule["uuids"] = uuids
return nil
}
func resourceCloudStackFirewallRuleHash(v interface{}) int {
var buf bytes.Buffer
m := v.(map[string]interface{})
buf.WriteString(fmt.Sprintf(
"%s-%s-", m["source_cidr"].(string), m["protocol"].(string)))
if v, ok := m["icmp_type"]; ok {
buf.WriteString(fmt.Sprintf("%d-", v.(int)))
}
if v, ok := m["icmp_code"]; ok {
buf.WriteString(fmt.Sprintf("%d-", v.(int)))
}
// We need to make sure to sort the strings below so that we always
// generate the same hash code no matter what is in the set.
if v, ok := m["ports"]; ok {
vs := v.(*schema.Set).List()
s := make([]string, len(vs))
for i, raw := range vs {
s[i] = raw.(string)
}
sort.Strings(s)
for _, v := range s {
buf.WriteString(fmt.Sprintf("%s-", v))
}
}
return hashcode.String(buf.String())
}
func verifyFirewallParams(d *schema.ResourceData) error {
managed := d.Get("managed").(bool)
_, rules := d.GetOk("rule")
if !rules && !managed {
return fmt.Errorf(
"You must supply at least one 'rule' when not using the 'managed' firewall feature")
}
return nil
}
func verifyFirewallRuleParams(d *schema.ResourceData, rule map[string]interface{}) error {
protocol := rule["protocol"].(string)
if protocol != "tcp" && protocol != "udp" && protocol != "icmp" {
return fmt.Errorf(
"%s is not a valid protocol. Valid options are 'tcp', 'udp' and 'icmp'", protocol)
}
if protocol == "icmp" {
if _, ok := rule["icmp_type"]; !ok {
return fmt.Errorf(
"Parameter icmp_type is a required parameter when using protocol 'icmp'")
}
if _, ok := rule["icmp_code"]; !ok {
return fmt.Errorf(
"Parameter icmp_code is a required parameter when using protocol 'icmp'")
}
} else {
if _, ok := rule["ports"]; !ok {
return fmt.Errorf(
"Parameter port is a required parameter when using protocol 'tcp' or 'udp'")
}
}
return nil
}