dnsmasq-webui/src/DnsmasqWebUI/Components/Pages/Hosts.razor

@page "/hosts"
@rendermode InteractiveServer
@namespace DnsmasqWebUI.Components.Pages
@inject IStatusClient StatusClient
@inject IHostsClient HostsClient
@inject IOptions<ApplicationOptions> AppOptions
<PageTitle>Hosts | @AppTitle</PageTitle>

<h1 class="page-title">Hosts file</h1>

@if (_status == null)
{
    <p class="d-flex align-items-center gap-2">
        <span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>
        Loading...
    </p>
}
else if (_status.NoHosts && !_pathInAddnHosts)
{
    <p class="text-muted">Hosts editing is disabled: <strong>no-hosts</strong> is set in dnsmasq config (dnsmasq only uses addn-hosts files) and the configured path is not in the effective addn-hosts list, so dnsmasq would not read the file.</p>
    @if (_status.AddnHostsPaths?.Count > 0)
    {
        <p class="text-muted small">Effective addn-hosts paths: @RenderAddnHostsList()</p>
    }
}
else if (string.IsNullOrEmpty(_status.SystemHostsPath))
{
    <p class="text-muted">No system hosts file configured. Set <strong>Dnsmasq:SystemHostsPath</strong> (e.g. /etc/hosts) to edit a hosts file from this app.</p>
    @if (_status.AddnHostsPaths?.Count > 0)
    {
        <p class="text-muted small">Dnsmasq loads these addn-hosts files: @RenderAddnHostsList()</p>
    }
}
else if (!_status.SystemHostsPathExists)
{
    <p class="text-warning">System hosts file not found: @_status.SystemHostsPath</p>
}
else
{
    @if (_status.DnsmasqStatus == "inactive" || _status.DnsmasqStatus == "unknown")
    {
        <div class="alert alert-warning">Dnsmasq service appears to be <strong>@_status.DnsmasqStatus</strong>. Save will update the file but reload may fail until the service is fixed.</div>
    }
    @if (_error != null)
    {
        <div class="alert alert-danger">@_error</div>
    }
    @if (_message != null)
    {
        <div class="alert alert-success">@_message</div>
    }
    <div class="table-responsive-cards">
        <div class="d-none d-md-block">
            <table class="table table-bordered">
                <thead>
                    <tr><th>#</th><th>Address</th><th>Names</th></tr>
                </thead>
                <tbody>
                    @foreach (var e in _entries.Where(x => !x.IsPassthrough))
                    {
                        <tr class="@(e.IsComment ? "table-secondary" : "")" @key="e.Id">
                            <td>@e.LineNumber</td>
                            <td>@e.Address</td>
                            <td>@string.Join(", ", e.Names)</td>
                        </tr>
                    }
                </tbody>
            </table>
        </div>
        <div class="d-md-none table-cards-mobile">
            @foreach (var e in _entries.Where(x => !x.IsPassthrough))
            {
                <div class="card mb-2 @(e.IsComment ? "table-secondary" : "")" @key="e.Id">
                    <div class="card-body py-2">
                        <div class="table-card-row"><span class="table-card-label">#</span> @e.LineNumber</div>
                        <div class="table-card-row"><span class="table-card-label">Address</span> @e.Address</div>
                        <div class="table-card-row"><span class="table-card-label">Names</span> @string.Join(", ", e.Names)</div>
                    </div>
                </div>
            }
        </div>
    </div>
    <p class="text-muted small">Path: @_status.SystemHostsPath</p>
    <button class="btn btn-primary mt-2" @onclick="Save" disabled="@_saving">Save</button>
}

@code {
    private string AppTitle => AppOptions!.Value!.EffectiveTitle;
    private DnsmasqServiceStatus? _status;
    private List<HostEntry> _entries = new();
    private string? _error;
    private string? _message;
    private bool _saving;

    /// <summary>True when SystemHostsPath is in the effective addn-hosts list (editing allowed when no-hosts is set).</summary>
    private bool _pathInAddnHosts => _status != null
        && !string.IsNullOrEmpty(_status.SystemHostsPath)
        && _status.AddnHostsPaths?.Any(p => string.Equals(p, Path.GetFullPath(_status.SystemHostsPath!.Trim()), StringComparison.Ordinal)) == true;

    /// <summary>Returns MarkupString so Blazor renders raw HTML (path + source label).</summary>
    private MarkupString RenderAddnHostsList()
    {
        if (_status?.AddnHostsPaths == null || _status.AddnHostsPaths.Count == 0)
            return (MarkupString)"(none)";
        var srcList = _status.EffectiveConfigSources?.AddnHostsPaths;
        if (srcList != null && srcList.Count == _status.AddnHostsPaths.Count)
        {
            return (MarkupString)string.Join(", ", srcList.Select(e =>
            {
                var src = e.Source;
                var tip = src?.GetReadOnlyTooltip() ?? "";
                var label = src == null ? "?" : (src.IsReadOnly ? "from " + src.FileName + ", readonly" : "editable");
                return $"{System.Net.WebUtility.HtmlEncode(e.Path)} <span class=\"text-muted\" title=\"{System.Net.WebUtility.HtmlEncode(tip)}\">({System.Net.WebUtility.HtmlEncode(label)})</span>";
            }));
        }
        return (MarkupString)System.Net.WebUtility.HtmlEncode(string.Join(", ", _status.AddnHostsPaths));
    }

    protected override async Task OnInitializedAsync()
    {
        await Load();
    }

    private async Task Load()
    {
        _error = null;
        _message = null;
        try
        {
            _status = await StatusClient.GetStatusAsync();
            var entries = await HostsClient.GetHostsAsync();
            _entries = entries?.ToList() ?? new List<HostEntry>();
        }
        catch (Exception ex)
        {
            _error = ex.Message;
        }
    }

    private async Task Save()
    {
        _saving = true;
        _error = null;
        _message = null;
        try
        {
            var result = await HostsClient.SaveHostsAsync(_entries);
            if (result.Reload.Success)
                _message = "Saved and dnsmasq reloaded.";
            else if (!string.IsNullOrEmpty(result.Reload.StdErr))
                _error = "Saved but dnsmasq reload failed: " + result.Reload.StdErr;
            else
                _message = "Saved.";
        }
        catch (Exception ex)
        {
            _error = ex.Message;
        }
        finally
        {
            _saving = false;
        }
    }
}