New resource: aws_eip_domain_name

.changelog/36767.txt

@@ -1,3 +1,3 @@
 ```release-note:enhancement
-resource/openzfs_file_system: Add `endpoint_ip_address` attribute
+resource/aws_fsx_openzfs_file_system: Add `endpoint_ip_address` attribute
 ```

.changelog/36963.txt

@@ -0,0 +1,11 @@
+```release-note:enhancement
+data-source/aws_eip: Add `ptr_record` attribute
+```
+
+```release-note:enhancement
+resource/aws_eip: Add `ptr_record` attribute
+```
+
+```release-note:new-resource
+aws_eip_domain_name
+```

internal/conns/awsclient.go

@@ -9,6 +9,7 @@ import (
 	"maps"
 	"net/http"
 	"os"
+	"strings"
 	"sync"
 
 	aws_sdkv2 "github.com/aws/aws-sdk-go-v2/aws"
@@ -250,6 +251,40 @@ func (c *AWSClient) ReverseDNSPrefix(ctx context.Context) string {
 	return names.ReverseDNS(c.DNSSuffix(ctx))
 }
 
+// EC2RegionalPrivateDNSSuffix returns the EC2 private DNS suffix for the configured AWS Region.
+func (c *AWSClient) EC2RegionalPrivateDNSSuffix(context.Context) string {
+	region := c.Region
+	if region == names.USEast1RegionID {
+		return "ec2.internal"
+	}
+
+	return fmt.Sprintf("%s.compute.internal", region)
+}
+
+// EC2RegionalPublicDNSSuffix returns the EC2 public DNS suffix for the configured AWS Region.
+func (c *AWSClient) EC2RegionalPublicDNSSuffix(context.Context) string {
+	region := c.Region
+	if region == names.USEast1RegionID {
+		return "compute-1"
+	}
+
+	return fmt.Sprintf("%s.compute", region)
+}
+
+// EC2PrivateDNSNameForIP returns a EC2 private DNS name in the configured AWS Region.
+func (c *AWSClient) EC2PrivateDNSNameForIP(ctx context.Context, ip string) string {
+	return fmt.Sprintf("ip-%s.%s", convertIPToDashIP(ip), c.EC2RegionalPrivateDNSSuffix(ctx))
+}
+
+// EC2PublicDNSNameForIP returns a EC2 public DNS name in the configured AWS Region.
+func (c *AWSClient) EC2PublicDNSNameForIP(ctx context.Context, ip string) string {
+	return c.PartitionHostname(ctx, fmt.Sprintf("ec2-%s.%s", convertIPToDashIP(ip), c.EC2RegionalPublicDNSSuffix(ctx)))
+}
+
+func convertIPToDashIP(ip string) string {
+	return strings.Replace(ip, ".", "-", -1)
+}
+
 // apiClientConfig returns the AWS API client configuration parameters for the specified service.
 func (c *AWSClient) apiClientConfig(ctx context.Context, servicePackageName string) map[string]any {
 	m := map[string]any{

internal/conns/awsclient_test.go

@@ -93,3 +93,91 @@ func TestAWSClientRegionalHostname(t *testing.T) { // nosemgrep:ci.aws-in-func-n
 		})
 	}
 }
+
+func TestAWSClientEC2PrivateDNSNameForIP(t *testing.T) { // nosemgrep:ci.aws-in-func-name
+	t.Parallel()
+
+	ctx := context.TODO()
+	testCases := []struct {
+		Name      string
+		AWSClient *AWSClient
+		IP        string
+		Expected  string
+	}{
+		{
+			Name: "us-west-2",
+			AWSClient: &AWSClient{
+				dnsSuffix: "amazonaws.com",
+				Region:    "us-west-2", //lintignore:AWSAT003
+			},
+			IP:       "10.20.30.40",
+			Expected: "ip-10-20-30-40.us-west-2.compute.internal", //lintignore:AWSAT003
+		},
+		{
+			Name: "us-east-1",
+			AWSClient: &AWSClient{
+				dnsSuffix: "amazonaws.com",
+				Region:    "us-east-1", //lintignore:AWSAT003
+			},
+			IP:       "10.20.30.40",
+			Expected: "ip-10-20-30-40.ec2.internal",
+		},
+	}
+
+	for _, testCase := range testCases {
+		testCase := testCase
+		t.Run(testCase.Name, func(t *testing.T) {
+			t.Parallel()
+
+			got := testCase.AWSClient.EC2PrivateDNSNameForIP(ctx, testCase.IP)
+
+			if got != testCase.Expected {
+				t.Errorf("got %s, expected %s", got, testCase.Expected)
+			}
+		})
+	}
+}
+
+func TestAWSClientEC2PublicDNSNameForIP(t *testing.T) { // nosemgrep:ci.aws-in-func-name
+	t.Parallel()
+
+	ctx := context.TODO()
+	testCases := []struct {
+		Name      string
+		AWSClient *AWSClient
+		IP        string
+		Expected  string
+	}{
+		{
+			Name: "us-west-2",
+			AWSClient: &AWSClient{
+				dnsSuffix: "amazonaws.com",
+				Region:    "us-west-2", //lintignore:AWSAT003
+			},
+			IP:       "10.20.30.40",
+			Expected: "ec2-10-20-30-40.us-west-2.compute.amazonaws.com", //lintignore:AWSAT003
+		},
+		{
+			Name: "us-east-1",
+			AWSClient: &AWSClient{
+				dnsSuffix: "amazonaws.com",
+				Region:    "us-east-1", //lintignore:AWSAT003
+			},
+			IP:       "10.20.30.40",
+			Expected: "ec2-10-20-30-40.compute-1.amazonaws.com",
+		},
+	}
+
+	for _, testCase := range testCases {
+		testCase := testCase
+		t.Run(testCase.Name, func(t *testing.T) {
+			t.Parallel()
+
+			got := testCase.AWSClient.EC2PublicDNSNameForIP(ctx, testCase.IP)
+
+			if got != testCase.Expected {
+				t.Errorf("got %s, expected %s", got, testCase.Expected)
+			}
+		})
+	}
+}

internal/sdkv2/suppress.go

@@ -0,0 +1,16 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package sdkv2
+
+import (
+	"strings"
+
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
+)
+
+// SuppressEquivalentStringCaseInsensitive provides custom difference suppression
+// for strings that are equal under case-insensitivity.
+func SuppressEquivalentStringCaseInsensitive(k, old, new string, d *schema.ResourceData) bool {
+	return strings.EqualFold(old, new)
+}

internal/service/ec2/consts.go

@@ -96,6 +96,11 @@ const (
 	CustomerGatewayStatePending   = "pending"
 )
 
+// See https://docs.aws.amazon.com/cli/latest/reference/ec2/modify-address-attribute.html#examples.
+const (
+	PTRUpdateStatusPending = "PENDING"
+)
+
 const (
 	managedPrefixListAddressFamilyIPv4 = "IPv4"
 	managedPrefixListAddressFamilyIPv6 = "IPv6"