103 lines
4.3 KiB
Svelte
103 lines
4.3 KiB
Svelte
<script lang="ts">
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interface Props {
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ptrRecords?: string[];
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ptrForwardRecords?: string[];
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senderIp?: string;
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}
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let { ptrRecords, ptrForwardRecords, senderIp }: Props = $props();
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// Forward-confirmed reverse DNS is valid if:
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// 1. PTR records exist
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// 2. Forward records exist
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// 3. At least one forward record matches the original sender IP
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const fcrDnsIsValid = $derived(
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ptrRecords &&
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ptrRecords.length > 0 &&
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ptrForwardRecords &&
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ptrForwardRecords.length > 0 &&
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senderIp &&
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ptrForwardRecords.includes(senderIp),
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);
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const hasForwardRecords = $derived(ptrForwardRecords && ptrForwardRecords.length > 0);
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</script>
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{#if ptrRecords && ptrRecords.length > 0}
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<div class="card mb-4">
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<div class="card-header d-flex justify-content-between align-items-center">
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<h5 class="text-muted mb-0">
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<i
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class="bi"
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class:bi-check-circle-fill={fcrDnsIsValid}
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class:text-success={fcrDnsIsValid}
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class:bi-x-circle-fill={!fcrDnsIsValid}
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class:text-danger={!fcrDnsIsValid}
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></i>
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Forward-Confirmed Reverse DNS
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</h5>
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<span class="badge bg-secondary">FCrDNS</span>
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</div>
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<div class="card-body">
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<p class="card-text small text-muted mb-0">
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Forward-confirmed reverse DNS (FCrDNS) verifies that the PTR hostname resolves back
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to the original sender IP. This double-check helps establish sender legitimacy.
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</p>
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{#if senderIp}
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<div class="mt-2">
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<strong>Original Sender IP:</strong> <code>{senderIp}</code>
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</div>
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{/if}
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</div>
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{#if hasForwardRecords}
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<div class="list-group list-group-flush">
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<div class="list-group-item">
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<div class="mb-2">
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<strong>PTR Hostname(s):</strong>
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{#each ptrRecords as ptr}
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<div class="mt-1">
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<code>{ptr}</code>
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</div>
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{/each}
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</div>
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<div class="mb-2">
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<strong>Forward Resolution (A/AAAA):</strong>
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{#each ptrForwardRecords as ip}
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<div class="d-flex gap-2 align-items-center mt-1">
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{#if senderIp && ip === senderIp}
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<span class="badge bg-success">Match</span>
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{:else}
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<span class="badge bg-warning">Different</span>
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{/if}
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<code>{ip}</code>
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</div>
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{/each}
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</div>
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{#if fcrDnsIsValid}
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<div class="alert alert-success mb-0 mt-2">
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<i class="bi bi-check-circle me-1"></i>
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<strong>Success:</strong> Forward-confirmed reverse DNS is properly configured.
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The PTR hostname resolves back to the sender IP.
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</div>
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{:else}
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<div class="alert alert-warning mb-0 mt-2">
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<i class="bi bi-exclamation-triangle me-1"></i>
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<strong>Warning:</strong> The PTR hostname does not resolve back to the sender
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IP. This may impact deliverability.
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</div>
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{/if}
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</div>
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</div>
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{:else}
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<div class="list-group list-group-flush">
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<div class="list-group-item">
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<div class="alert alert-danger mb-0">
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<i class="bi bi-x-circle me-1"></i>
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<strong>Error:</strong> PTR hostname(s) found but could not resolve to any IP
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addresses. Check your DNS configuration.
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</div>
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</div>
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</div>
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{/if}
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</div>
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{/if}
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