mesh-catalog/modules/avahi/cmd/avahi-tools/avahi_test.go

package main

import (
	"strings"
	"testing"
)

const browse = `+;enp6s0;IPv4;home\032server;_ssh._tcp;local
+;enp6s0;IPv4;Printer\046Co;_ipp._tcp;local
=;enp6s0;IPv4;home\032server;_ssh._tcp;local;home-server.local;192.168.1.10;22;
=;enp6s0;IPv4;Printer\046Co;_ipp._tcp;local;printer.local;192.168.1.20;631;"txtvers=1" "rp=ipp/print"
+;enp6s0;IPv6;Kitchen;_spotify-connect._tcp;local
`

func TestABrowseIsReadResolvedOnceAndUnescaped(t *testing.T) {
	s := ParseBrowse(browse)
	if len(s) != 3 {
		t.Fatalf("%+v", s)
	}
	by := map[string]Service{}
	for _, x := range s {
		by[x.Name] = x
	}
	ssh := by["home server"]
	if !ssh.Resolved || ssh.Address != "192.168.1.10" || ssh.Port != 22 || ssh.Host != "home-server.local" {
		t.Fatalf("%+v", ssh)
	}
	ipp := by["Printer.Co"]
	if strings.Join(ipp.TXT, ",") != "txtvers=1,rp=ipp/print" {
		t.Fatalf("%+v", ipp)
	}
	if k := by["Kitchen"]; k.Resolved || k.Type != "_spotify-connect._tcp" {
		t.Fatalf("%+v", k)
	}
	if unescape(`caf\195\169`) != "café" || unescape(`a\.b`) != "a.b" {
		t.Fatal("unescape")
	}
}

func TestABrowseThatHearsNothingSaysTheFilterDropsMDNS(t *testing.T) {
	var calls []call
	m := machine(fake(func(c call) Ran {
		switch c.String() {
		case "timeout 5 avahi-browse -p -r -t -a":
			return Ran{Status: 124}
		case "sudo -n nft list ruleset":
			return Ran{Stdout: "table inet mesh {\n chain input {\n type filter hook input priority filter; policy drop;\n tcp dport 22 accept\n }\n}\n"}
		}
		return Ran{Status: 99}
	}, &calls), 1000)
	r, err := m.Browse(5, "")
	if err != nil || r["count"] != 0 || !strings.Contains(r["note"].(string), "drops inbound UDP 5353") {
		t.Fatalf("%v %v", r, err)
	}
	if _, err := m.Browse(5, "ssh; rm"); err == nil {
		t.Fatal("not a service type")
	}
}

func TestTheFilterIsReadForAnAcceptedInboundMDNS(t *testing.T) {
	for rs, want := range map[string]bool{
		"\t\tudp dport 5353 accept\n":                            true,
		"\t\tiifname \"enp6s0\" udp dport { 53, 5353 } accept\n": true,
		"\t\tudp dport mdns accept\n":                            true,
		"\t\tudp dport 53 accept\n":                              false,
		"\t\tudp dport 5353 drop\n":                              false,
		"\t\tip saddr 10.0.0.0/8 udp dport 15353 accept\n":       false,
	} {
		if InboundMDNS(rs) != want {
			t.Errorf("%q: %v", rs, !want)
		}
	}
}

func TestStatusNamesTheSwitchTheFilterAndTheDaemon(t *testing.T) {
	m := machine(fake(func(c call) Ran {
		switch {
		case c.name == "systemctl" && c.args[1] == Daemon:
			return Ran{Stdout: "LoadState=loaded\nActiveState=active\nUnitFileState=enabled\n"}
		case c.name == "systemctl":
			return Ran{Stdout: "ActiveState=inactive\n"}
		case c.String() == "avahi-daemon --version":
			return Ran{Stdout: "avahi-daemon 0.9-rc5\n"}
		case c.String() == "pacman -Q nss-mdns":
			return Ran{Stdout: "nss-mdns 0.15.1-2\n"}
		case c.String() == "sudo -n nft list ruleset":
			return Ran{Stdout: "udp dport 53 accept\n"}
		}
		return Ran{Status: 99}
	}, nil), 1000)
	files := map[string]string{
		DaemonConf: "[server]\nuse-ipv4=yes\n#host-name=foo\nallow-interfaces=enp6s0\n[publish]\npublish-hinfo=no\n",
		NSSwitch:   "passwd: files\nhosts: mymachines files dns mdns4_minimal [NOTFOUND=return] resolve [!UNAVAIL=return]\n",
	}
	m.ReadFile = func(p string) ([]byte, error) {
		if s, ok := files[p]; ok {
			return []byte(s), nil
		}
		return nil, errNoFile
	}
	s, err := m.GetStatus()
	if err != nil {
		t.Fatal(err)
	}
	if !s.MDNSWired || s.NSSMDNS != "nss-mdns 0.15.1-2" || s.InboundMDNS == nil || *s.InboundMDNS || s.Version != "avahi-daemon 0.9-rc5" {
		t.Fatalf("%+v", s)
	}
	if s.Config["server"]["allow-interfaces"] != "enp6s0" || s.Config["server"]["host-name"] != "" || s.Daemon["ActiveState"] != "active" {
		t.Fatalf("%+v", s.Config)
	}
	if len(s.Notes) != 1 || !strings.Contains(s.Notes[0], "drops inbound UDP 5353") {
		t.Fatalf("%v", s.Notes)
	}
	if _, wired := HostsLine("hosts: files dns\n"); wired {
		t.Fatal("no mdns on the line")
	}
}

func TestResolveAsksAvahiAndTheNameServiceAndReadsAFailureFromStderr(t *testing.T) {
	m := machine(byLine(map[string]Ran{
		"avahi-resolve -n printer.local": {Stdout: "printer.local\t192.168.1.20\n"},
		"getent hosts printer.local":     {Status: 2},
		"avahi-resolve -n nowhere.local": {Stderr: "Failed to resolve host name 'nowhere.local': Timeout reached\n"},
		"getent hosts nowhere.local":     {Status: 2},
		"sudo -n nft list ruleset":       {Stdout: "udp dport 5353 accept\n"},
		"avahi-resolve -a 192.168.1.20":  {Stdout: "192.168.1.20\tprinter.local\n"},
	}, nil), 1000)
	r, err := m.Resolve("printer", "")
	if err != nil {
		t.Fatal(err)
	}
	if r["avahi"].(map[string]any)["resolved"] != true || r["name_service"].(map[string]any)["resolved"] != false {
		t.Fatalf("%v", r)
	}
	r, _ = m.Resolve("nowhere.local", "")
	if a := r["avahi"].(map[string]any); a["resolved"] != false || !strings.Contains(a["error"].(string), "Timeout reached") || r["note"] != "nothing was heard on the local network" {
		t.Fatalf("%v", r)
	}
	r, _ = m.Resolve("", "192.168.1.20")
	if r["avahi"].(map[string]any)["answers"].([]string)[0] != "printer.local" {
		t.Fatalf("%v", r)
	}
	for _, bad := range [][2]string{{"", ""}, {"a", "1.2.3.4"}, {"", "not-an-ip"}} {
		if _, err := m.Resolve(bad[0], bad[1]); err == nil {
			t.Errorf("%v accepted", bad)
		}
	}
}

func TestPublishedServicesAreReadFromTheirFiles(t *testing.T) {
	m := machine(byLine(map[string]Ran{
		"find /etc/avahi/services -mindepth 1 -maxdepth 1 -name *.service -printf %f\n": {Stdout: "ssh.service\n"},
	}, nil), 1000)
	m.ReadFile = func(string) ([]byte, error) {
		return []byte(`<service-group><name replace-wildcards="yes">%h</name><service><type>_ssh._tcp</type><port>22</port></service></service-group>`), nil
	}
	r, err := m.Services()
	if err != nil {
		t.Fatal(err)
	}
	p := r["published"].([]Published)
	if len(p) != 1 || p[0].Name != "%h" || p[0].Types[0] != "_ssh._tcp" || p[0].Ports[0] != 22 {
		t.Fatalf("%+v", p)
	}
}