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123 lines
3.4 KiB
Go
123 lines
3.4 KiB
Go
//go:build (linux && !android) || freebsd
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package server
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import (
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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// TestPickXorgCandidate covers which X server a service-mode capturer attaches
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// to when several are running. Picking the wrong one shows a remote user
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// another local user's screen and delivers their input to it, so the active VT
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// wins whenever it is known and an unresolvable choice is refused outright.
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func TestPickXorgCandidate(t *testing.T) {
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tests := []struct {
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name string
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candidates []xorgCandidate
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activeVT int
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want string
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wantOutcome x11Detection
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}{
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{
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name: "no X server found",
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wantOutcome: x11NotFound,
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},
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{
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name: "single server is used whatever its VT",
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candidates: []xorgCandidate{{display: ":3", vt: 9}},
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activeVT: 2,
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want: ":3",
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wantOutcome: x11Detected,
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},
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{
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name: "active VT wins over the lower display number",
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candidates: []xorgCandidate{
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{display: ":0", vt: 2},
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{display: ":1", vt: 7},
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},
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activeVT: 7,
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want: ":1",
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wantOutcome: x11Detected,
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},
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{
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name: "several servers on other VTs are refused, not guessed at",
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candidates: []xorgCandidate{
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{display: ":0", vt: 2},
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{display: ":1", vt: 3},
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},
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activeVT: 7,
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wantOutcome: x11Ambiguous,
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},
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{
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name: "unknown active VT does not license a guess between seats",
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candidates: []xorgCandidate{
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{display: ":0", vt: 2},
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{display: ":1", vt: 3},
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},
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activeVT: -1,
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wantOutcome: x11Ambiguous,
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},
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{
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name: "a VT-less server is preferred over one on an inactive VT",
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candidates: []xorgCandidate{
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{display: ":0", vt: 2},
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{display: ":99", vt: -1},
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},
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activeVT: 7,
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want: ":99",
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wantOutcome: x11Detected,
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},
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{
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name: "display numbers compare numerically, not lexically",
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candidates: []xorgCandidate{
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{display: ":10", vt: -1},
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{display: ":2", vt: -1},
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},
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activeVT: -1,
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want: ":2",
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wantOutcome: x11Detected,
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},
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{
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name: "an unparseable display is only picked when it is alone",
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candidates: []xorgCandidate{
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{display: ":bogus", vt: -1},
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{display: ":4", vt: -1},
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},
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activeVT: -1,
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want: ":4",
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wantOutcome: x11Detected,
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},
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}
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for _, tc := range tests {
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t.Run(tc.name, func(t *testing.T) {
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got, outcome := pickXorgCandidate(tc.candidates, tc.activeVT)
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require.Equal(t, tc.wantOutcome, outcome)
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if tc.wantOutcome != x11Detected {
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assert.Empty(t, got.display, "a refused choice must not leak a display")
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return
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}
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assert.Equal(t, tc.want, got.display)
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})
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}
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}
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// TestParseXorgVT confirms the bare "vt7" token X servers carry in argv is the
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// one read, and that nothing else in the command line is mistaken for it.
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func TestParseXorgVT(t *testing.T) {
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assert.Equal(t, 7, parseXorgVT([]string{"/usr/lib/Xorg", ":0", "-auth", "/run/x.auth", "vt7", "-novtswitch"}))
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assert.Equal(t, -1, parseXorgVT([]string{"/usr/bin/Xvfb", ":99", "-screen", "0", "1920x1080x24"}))
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assert.Equal(t, -1, parseXorgVT([]string{"/usr/lib/Xorg", ":0", "vtconsole"}))
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}
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// TestDescribeActiveVT keeps "we could not read the active VT" legible in the
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// log line, rather than printing a -1 that reads like a real terminal.
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func TestDescribeActiveVT(t *testing.T) {
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assert.Equal(t, "unknown", describeActiveVT(-1))
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assert.Equal(t, "unknown", describeActiveVT(0))
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assert.Equal(t, "tty7", describeActiveVT(7))
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}
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