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parser_test.go
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package iptables_parser
import (
"errors"
"fmt"
"io"
"net"
"reflect"
"strings"
"testing"
)
var (
_true bool = true
_false bool = false
)
func parseCIDR(s string) net.IPNet {
if !strings.Contains(s, "/") {
s = s + "/32"
}
_, r, err := net.ParseCIDR(s)
if err != nil {
panic(err.Error())
}
return *r
}
func TestDNSOrIPPair_Spec(t *testing.T) {
for i, tc := range []struct {
d DNSOrIPPair
f string
r []string
}{
{
d: DNSOrIPPair{
Not: false,
Value: DNSOrIP{
iP: parseCIDR("10.0.0.0/24"),
},
},
f: "-d",
r: []string{"-d", "10.0.0.0/24"},
},
{
d: DNSOrIPPair{
Not: true,
Value: DNSOrIP{
iP: parseCIDR("10.0.0.0/24"),
},
},
f: "-d",
r: []string{"!", "-d", "10.0.0.0/24"},
},
} {
if res := tc.d.Spec(tc.f); !reflect.DeepEqual(res, tc.r) {
t.Errorf("test %d:\n\texp=%q\n\tgot=%q\n", i, tc.r, res)
}
}
}
func TestStringPair_Spec(t *testing.T) {
for i, tc := range []struct {
p StringPair
f string
r []string
}{
{
p: StringPair{
Not: false,
Value: "foo",
},
f: "-p",
r: []string{"-p", "foo"},
},
{
p: StringPair{
Not: true,
Value: "bar",
},
f: "-i",
r: []string{"!", "-i", "bar"},
},
} {
if res := tc.p.Spec(tc.f); !reflect.DeepEqual(res, tc.r) {
t.Errorf("test %d:\n\texp=%q\n\tgot=%q\n", i, tc.r, res)
}
}
}
func TestDNSOrIP_Set(t *testing.T) {
for i, tc := range []struct {
in string
out []string
}{
{
in: "10.10.0.0/16",
out: []string{"-s", "10.10.0.0/16"},
},
{
in: "10.10.0.1",
out: []string{"-s", "10.10.0.1/32"},
},
{
in: "10::/64",
out: []string{"-s", "10::/64"},
},
{
in: "10::10",
out: []string{"-s", "10::10/128"},
},
} {
t.Run(fmt.Sprintf("test %d", i), func(t *testing.T) {
dnsOrIpPair := &DNSOrIPPair{}
dnsOrIpPair.Value.Set(tc.in)
if res := dnsOrIpPair.Spec("-s"); !reflect.DeepEqual(res, tc.out) {
t.Errorf("test %d:\n\texp=%q\n\tgot=%q\n", i, tc.out, res)
}
})
}
}
func TestFlag_String(t *testing.T) {
for i, tc := range []struct {
p Flag
f string
r string
}{
{
p: Flag{
Not: false,
Values: []string{"foo"},
},
f: "-p",
r: "-p foo",
},
{
p: Flag{
Not: true,
Values: []string{"bar", "foo"},
},
f: "-i",
r: "! -i bar foo",
},
} {
if res := tc.p.String(tc.f); !reflect.DeepEqual(res, tc.r) {
t.Errorf("test %d:\n\texp=%q\n\tgot=%q\n", i, tc.r, res)
}
}
}
func TestMatch_String(t *testing.T) {
for i, tc := range []struct {
p Match
r string
}{
{
p: Match{
Type: "comment",
Flags: map[string]Flag{
"comment": {
Values: []string{"hallo"},
},
},
},
r: "-m comment --comment hallo",
},
{
p: Match{
Type: "tcp",
Flags: map[string]Flag{
"tcp-options": {
Not: true,
Values: []string{"bla", "blub"},
},
},
},
r: "-m tcp ! --tcp-options bla blub",
},
} {
if res := tc.p.String(); !reflect.DeepEqual(res, tc.r) {
t.Errorf("test %d:\n\texp=%q\n\tgot=%q\n", i, tc.r, res)
}
}
}
func TestTarget_String(t *testing.T) {
for i, tc := range []struct {
p Target
f string
r string
}{
{
p: Target{
Name: "foo",
Flags: map[string]Flag{
"bar": {
Values: []string{"foo"},
},
},
},
f: "-g",
r: "-g foo --bar foo",
},
{
p: Target{
Name: "foo",
Flags: map[string]Flag{
"bar": {
Not: true,
Values: []string{"foo", "bar"},
},
},
},
f: "-j",
r: "-j foo ! --bar foo bar",
},
} {
if res := tc.p.String(tc.f); !reflect.DeepEqual(res, tc.r) {
t.Errorf("test %d:\n\texp=%q\n\tgot=%q\n", i, tc.r, res)
}
}
}
func TestRule_Spec(t *testing.T) {
for i, tc := range []struct {
rule Rule
res []string
}{
{
rule: Rule{
Chain: "foo",
Source: &DNSOrIPPair{
Value: DNSOrIP{
iP: parseCIDR("192.168.178.2"),
},
Not: true,
},
Destination: &DNSOrIPPair{Value: DNSOrIP{iP: parseCIDR("1.1.1.1")}, Not: true},
},
res: []string{"!", "-s", "192.168.178.2/32", "!", "-d", "1.1.1.1/32"},
},
} {
if res := tc.rule.Spec(); !reflect.DeepEqual(res, tc.res) {
t.Errorf("test %d:\n\texp=%q\n\tgot=%q\n", i, tc.res, res)
}
}
}
func TestRule_String(t *testing.T) {
for i, tc := range []struct {
rule Rule
res string
}{
{
rule: Rule{
Chain: "foo",
Source: &DNSOrIPPair{
Value: DNSOrIP{
iP: parseCIDR("192.168.178.2"),
},
Not: true,
},
Destination: &DNSOrIPPair{Value: DNSOrIP{iP: parseCIDR("1.1.1.1")}, Not: true},
},
res: "-A foo ! -s 192.168.178.2/32 ! -d 1.1.1.1/32",
},
{
rule: Rule{
Chain: "KUBE-POSTROUTING",
Matches: []Match{
{
Type: "comment",
Flags: map[string]Flag{
"comment": {Values: []string{`kubernetes service traffic requiring SNAT`}},
},
},
},
Jump: &Target{
Name: "MASQUERADE",
Flags: map[string]Flag{
"to-ports": {
Values: []string{"200-1000"},
},
},
},
},
res: `-A KUBE-POSTROUTING -m comment --comment "kubernetes service traffic requiring SNAT" -j MASQUERADE --to-ports 200-1000`,
},
} {
if res := tc.rule.String(); !reflect.DeepEqual(res, tc.res) {
t.Errorf("test %d:\n\texp=%q\n\tgot=%q\n", i, tc.res, res)
}
}
}
func Test_NewRuleFromSpec(t *testing.T) {
for i, tc := range []struct {
spec []string
chain string
rule Rule
}{
{
spec: []string{"-p", "tcp", "-j", "RETURN"},
chain: "foo",
rule: Rule{
Chain: "foo",
Protocol: &StringPair{
Value: "tcp",
},
Jump: &Target{
Name: "RETURN",
},
},
},
} {
if r, err := NewRuleFromSpec(tc.chain, tc.spec...); !reflect.DeepEqual(*r, tc.rule) {
if err != nil {
t.Errorf("test case %d unexpected error:\n\texp=%q\n\tgot=%q\n", i, tc.rule, r)
}
t.Errorf("test case %d rule missmatch:\n\texp=%#v\n\tgot=%#v\n", i, tc.rule, r)
}
}
}
func TestParser_Parse(t *testing.T) {
for i, tc := range []struct {
name string
s string
r Line
err error
}{
{
name: "parse empty string",
s: "",
r: nil,
err: io.EOF,
},
{
name: "parse comment",
s: "# hello you.",
r: Comment{Content: " hello you."},
err: nil,
},
{
name: "parse more comment",
s: "# hello you.\ncutey",
r: Comment{Content: " hello you."},
err: nil,
},
{
name: "parse header",
s: "*hello you.\ncutey",
r: Header{Content: "hello you."},
err: nil,
},
{
name: "parse default rule",
s: ":hello ACCEPT [10:100]",
r: Policy{
Chain: "hello",
Action: "ACCEPT",
Counter: &Counter{
packets: 10,
bytes: 100,
},
},
err: nil,
},
{
name: "parse default rule",
s: ":hello-chain DROP [0:100]",
r: Policy{
Chain: "hello-chain",
Action: "DROP",
Counter: &Counter{
packets: 0,
bytes: 100,
},
},
err: nil,
},
{
name: "parse default rule without counter",
s: ":hello-chain DROP",
r: Policy{
Chain: "hello-chain",
Action: "DROP",
Counter: &Counter{
packets: 0,
bytes: 0,
},
},
err: nil,
},
{
name: "parse policy",
s: "-P hello-chain DROP",
r: Policy{
Chain: "hello-chain",
Action: "DROP",
UserDefined: &_false,
},
err: nil,
},
{
name: "parse userdefined policy",
s: "-N hello-chain",
r: Policy{
Chain: "hello-chain",
UserDefined: &_true,
},
err: nil,
},
{
name: "parse rule",
s: "-A foo ! -s 192.168.178.2 ! --dst 1.1.1.1",
r: Rule{
Chain: "foo",
Source: &DNSOrIPPair{
Value: DNSOrIP{
iP: parseCIDR("192.168.178.2"),
},
Not: true,
},
Destination: &DNSOrIPPair{Value: DNSOrIP{iP: parseCIDR("1.1.1.1")}, Not: true},
},
err: nil,
},
{
name: "parse rule",
s: "-A foo --destination=192.168.178.2",
r: Rule{
Chain: "foo",
Destination: &DNSOrIPPair{Value: DNSOrIP{iP: parseCIDR("192.168.178.2")}},
},
err: nil,
},
{
name: "parse rule with DNS name",
s: "-A foo --destination=example.com",
r: Rule{
Chain: "foo",
Destination: &DNSOrIPPair{Value: DNSOrIP{dNS: "example.com"}},
},
err: nil,
},
{
name: "parse rule with not ending comment",
s: "-A foo ! --fragment -o=wg0 --in-interface=wlan-0 --destination=192.168.178.2 --protocol all -j RETURN -m comment --comment \"this crazy\\",
r: Rule{
Chain: "foo",
Destination: &DNSOrIPPair{Value: DNSOrIP{iP: parseCIDR("192.168.178.2")}},
Protocol: &StringPair{
Value: "all",
},
InInterf: &StringPair{
Value: "wlan-0",
},
OutInterf: &StringPair{
Value: "wg0",
},
Fragment: &_false,
Matches: []Match{
{
Type: "comment",
Flags: map[string]Flag{
"comment": {
Values: []string{`this crazy\`},
},
},
},
},
Jump: &Target{Name: "RETURN"},
},
err: nil,
},
{
name: "parse rule with comment",
s: "-A foo ! --fragment -o=wg0 --in-interface=wlan-0 --destination=192.168.178.2 -m comment --comment \"this crazy\" --protocol all -j RETURN",
r: Rule{
Chain: "foo",
Destination: &DNSOrIPPair{Value: DNSOrIP{iP: parseCIDR("192.168.178.2")}},
Protocol: &StringPair{
Value: "all",
},
InInterf: &StringPair{
Value: "wlan-0",
},
OutInterf: &StringPair{
Value: "wg0",
},
Fragment: &_false,
Matches: []Match{
{
Type: "comment",
Flags: map[string]Flag{
"comment": {
Values: []string{`this crazy`},
},
},
},
},
Jump: &Target{Name: "RETURN"},
},
err: nil,
},
{
name: "parse rule with weird comment",
s: "-A foo -6 --ipv4 -g NOWHERE ! -f -i wlan0 --destination=192.168.178.2 ! -p tcp -m comment --comment \"--this-crazy\"",
r: Rule{
Chain: "foo",
Destination: &DNSOrIPPair{Value: DNSOrIP{iP: parseCIDR("192.168.178.2")}},
IPv6: true,
IPv4: true,
Protocol: &StringPair{
Not: true,
Value: "tcp",
},
InInterf: &StringPair{
Value: "wlan0",
},
Fragment: &_false, // /BoolPair{Value: true, Not: true},
Matches: []Match{
{
Type: "comment",
Flags: map[string]Flag{
"comment": {
Values: []string{`--this-crazy`},
},
},
},
},
Goto: &Target{Name: "NOWHERE"},
},
err: nil,
},
{
name: "parse rule with quotes in comment",
s: "-A foo -4 --ipv6 -m tcp --dport 8080 --destination=192.168.178.2 -m comment --comment \"this \\\"crazy\\\"\"",
r: Rule{
Chain: "foo",
Destination: &DNSOrIPPair{Value: DNSOrIP{iP: parseCIDR("192.168.178.2")}},
IPv4: true,
IPv6: true,
Matches: []Match{
{
Type: "tcp",
Flags: map[string]Flag{
"destination-port": {Values: []string{"8080"}},
},
},
{
Type: "comment",
Flags: map[string]Flag{
"comment": {
Values: []string{`this \"crazy\"`},
},
},
},
},
},
err: nil,
},
{
name: "parse rule with match all kind of flags",
s: "-A foo -4 --ipv6 --destination=192.168.178.2 -m comment --comment \"this \\\"crazy\\\"\" -m tcp ",
r: Rule{
Chain: "foo",
Destination: &DNSOrIPPair{Value: DNSOrIP{iP: parseCIDR("192.168.178.2")}},
IPv4: true,
IPv6: true,
Matches: []Match{
{
Type: "comment",
Flags: map[string]Flag{
"comment": {
Values: []string{`this \"crazy\"`},
},
},
},
{
Type: "tcp",
Flags: map[string]Flag{},
},
},
},
err: nil,
},
{
name: "parse rule with unknown flag",
s: "-A foo --destination=192.168.178.2 -m comment --comment \"this \\\"crazy\\\"\" --fantasy flag",
err: errors.New("failed to parse line, skipping rest \" flag\" of the line: unknown flag \"--fantasy\" found"),
},
{
name: "parse rule with illegal flag",
s: "-A foo --destination=192.168.178.2 ! -j SOMEWHERE -p fantasy -m comment --comment \"this \\\"crazy\\\"\" --fantasy flag",
err: errors.New(`failed to parse line, skipping rest " SOMEWHERE -p fantasy -m comment --comment \"this \\\"crazy\\\"\" --fantasy flag" of the line: encountered unknown flag "-j", or flag can not be negated with "!"`),
},
{
name: "parse rule with match expression tcp",
s: "-A foo -m tcp --tcp-flags SYN,FIN ACK --sport 1010 --destination-port 8080:9000 -4",
r: Rule{
Chain: "foo",
IPv4: true,
Matches: []Match{
{
Type: "tcp",
Flags: map[string]Flag{
"destination-port": {Values: []string{"8080:9000"}},
"source-port": {Values: []string{"1010"}},
"tcp-flags": {Values: []string{"SYN,FIN", "ACK"}},
},
},
},
},
err: nil,
},
{
name: "parse rule with match expression tcp and not",
s: "-A foo -m tcp --tcp-flags SYN,FIN ACK --sport 1010 ! --dport=1000 ! -f",
r: Rule{
Chain: "foo",
Fragment: &_false,
Matches: []Match{
{
Type: "tcp",
Flags: map[string]Flag{
"source-port": {Values: []string{"1010"}},
"destination-port": {
Values: []string{"1000"},
Not: true,
},
"tcp-flags": {Values: []string{"SYN,FIN", "ACK"}},
},
},
},
},
err: nil,
},
{
name: "parse rule with icmp type",
s: "-A foo -p icmp -m icmp --icmp-type 11",
r: Rule{
Chain: "foo",
Protocol: &StringPair{
Not: false,
Value: "icmp",
},
Matches: []Match{
{
Type: "icmp",
Flags: map[string]Flag{
"icmp-type": {Values: []string{"11"}},
},
},
},
},
err: nil,
},
{
name: "parse rule with icmp type",
s: "-A foo -p ipv6-icmp -m icmp6 --icmpv6-type 11",
r: Rule{
Chain: "foo",
Protocol: &StringPair{
Not: false,
Value: "ipv6-icmp",
},
Matches: []Match{
{
Type: "icmp6",
Flags: map[string]Flag{
"icmpv6-type": {Values: []string{"11"}},
},
},
},
},
err: nil,
},
{
name: "parse rule with match expression tcp and a lot of flags and overwriting",
s: "-A foo -m tcp --tcp-flags SYN,FIN ACK --sport 1010 ! --dport=1000:1010 --syn! --syn ! --tcp-option 1 ! -f ",
r: Rule{
Chain: "foo",
Fragment: &_false,
Matches: []Match{
{
Type: "tcp",
Flags: map[string]Flag{
"source-port": {Values: []string{"1010"}},
"destination-port": {
Values: []string{"1000:1010"},
Not: true,
},
"tcp-flags": {Values: []string{"SYN,FIN", "ACK"}},
"tcp-option": {
Not: true,
Values: []string{"1"},
},
"syn": {
Not: true,
},
},
},
},
},
err: nil,
},
{
name: "parse rule with match expression with all tcp flags",
s: "-A foo -m tcp! --tcp-flags SYN,FIN ACK! --sport 1010 --dport=1000:1010 --syn --tcp-option 1 -4 ",
r: Rule{
Chain: "foo",
IPv4: true,
Matches: []Match{
{
Type: "tcp",
Flags: map[string]Flag{
"source-port": {
Not: true,
Values: []string{"1010"},
},
"destination-port": {
Values: []string{"1000:1010"},
},
"tcp-flags": {
Not: true,
Values: []string{"SYN,FIN", "ACK"},
},
"tcp-option": {
Values: []string{"1"},
},
"syn": {},
},
},
},
},
err: nil,
},
{
name: "parse rule with empty match expression tcp in the end",
s: "-A foo -m tcp -4",
r: Rule{
Chain: "foo",
IPv4: true,
Matches: []Match{
{
Type: "tcp",
Flags: map[string]Flag{},
},
},
},
err: nil,
},
{
name: "parse rule with jump target DNAT",
s: "-A foo -m tcp! --tcp-flags SYN,FIN ACK! --sport 1010 --dport=1000:1010 --syn --tcp-option 1 -4 -j DNAT --random --to-destination 192.168.1.1-192.168.1.2:80-81",
r: Rule{
Chain: "foo",
IPv4: true,
Matches: []Match{
{
Type: "tcp",
Flags: map[string]Flag{
"source-port": {
Not: true,
Values: []string{"1010"},
},
"destination-port": {
Values: []string{"1000:1010"},
},
"tcp-flags": {
Not: true,
Values: []string{"SYN,FIN", "ACK"},
},
"tcp-option": {
Values: []string{"1"},
},
"syn": {},
},
},
},
Jump: &Target{
Name: "DNAT",
Flags: map[string]Flag{
"random": {},
"to-destination": {
Values: []string{"192.168.1.1-192.168.1.2:80-81"},
},
},
},
},
err: nil,
},
{
name: "parse rule with multiport jump target DNAT",
s: "-A foo -p tcp -m multiport --dports=25,143,465,587,993,4190 -4 -j DNAT --to-destination 192.168.1.1",
r: Rule{
Chain: "foo",
IPv4: true,
Protocol: &StringPair{
Not: false,
Value: "tcp",
},
Matches: []Match{
{
Type: "multiport",
Flags: map[string]Flag{
"destination-ports": {
Values: []string{"25", "143", "465", "587", "993", "4190"},
},
},
},
},
Jump: &Target{
Name: "DNAT",
Flags: map[string]Flag{
"to-destination": {
Values: []string{"192.168.1.1"},
},
},
},
},
err: nil,
},
{
name: "parse rule with jump target SNAT",
s: "-A foo -o eth0 -4 -j SNAT --to-source 192.168.1.1",
r: Rule{
Chain: "foo",
IPv4: true,
OutInterf: &StringPair{
Value: "eth0",
},
Jump: &Target{
Name: "SNAT",
Flags: map[string]Flag{
"to-source": {
Values: []string{"192.168.1.1"},
},
},
},
},
err: nil,
},
{
name: "parse rule with jump target fully-random SNAT",
s: "-A foo -o eth0 -4 -j SNAT --to-source 192.168.1.1 --random-fully",
r: Rule{
Chain: "foo",
IPv4: true,
OutInterf: &StringPair{
Value: "eth0",
},
Jump: &Target{
Name: "SNAT",
Flags: map[string]Flag{
"to-source": {
Values: []string{"192.168.1.1"},
},
"random-fully": {},
},
},
},
err: nil,
},
{
name: "parse real rule made by kubernetes",
s: `-A KUBE-SERVICES -m comment --comment "kubernetes service nodeports; NOTE: this must be the last rule in this chain" -m addrtype --dst-type LOCAL -j KUBE-NODEPORTS`,
r: Rule{
Chain: "KUBE-SERVICES",
Matches: []Match{
{
Type: "comment",
Flags: map[string]Flag{
"comment": {Values: []string{`kubernetes service nodeports; NOTE: this must be the last rule in this chain`}},
},
},
{
Type: "addrtype",
Flags: map[string]Flag{
"dst-type": {
Values: []string{"LOCAL"},
},
},
},
},
Jump: &Target{
Name: "KUBE-NODEPORTS",
},
},
err: nil,
},
{
name: "parse real rule made by kubernetes with udp match extension",
s: `-A KUBE-SERVICES -d 10.43.0.10/32 -p udp -m comment --comment "kube-system/kube-dns:dns cluster IP" -m udp --dport 53 -j KUBE-SVC-TCOU7JCQXEZGVUNU`,
r: Rule{
Chain: "KUBE-SERVICES",
Destination: &DNSOrIPPair{
Value: DNSOrIP{
iP: parseCIDR("10.43.0.10/32"),
},
},
Protocol: &StringPair{
Value: "udp",
},
Matches: []Match{
{
Type: "comment",
Flags: map[string]Flag{
"comment": {Values: []string{`kube-system/kube-dns:dns cluster IP`}},
},
},
{
Type: "udp",
Flags: map[string]Flag{
"destination-port": {
Values: []string{"53"},
},
},
},
},
Jump: &Target{
Name: "KUBE-SVC-TCOU7JCQXEZGVUNU",
},
},
err: nil,
},
{
name: "parse rule generated by kubernetes with MASQUERADE target",
s: `-A KUBE-POSTROUTING -m comment --comment "kubernetes service traffic requiring SNAT" -j MASQUERADE --random-fully`,
r: Rule{
Chain: "KUBE-POSTROUTING",
Matches: []Match{
{
Type: "comment",
Flags: map[string]Flag{
"comment": {Values: []string{`kubernetes service traffic requiring SNAT`}},
},
},
},
Jump: &Target{
Name: "MASQUERADE",
Flags: map[string]Flag{
"random-fully": {},
},
},
},
err: nil,
},
{
name: "parse rule with MASQUERADE target and all kinds of options",
s: `-A KUBE-POSTROUTING -m comment --comment "kubernetes service traffic requiring SNAT" -j MASQUERADE --random --to-ports 200-1000 --random-fully`,
r: Rule{
Chain: "KUBE-POSTROUTING",
Matches: []Match{
{
Type: "comment",
Flags: map[string]Flag{
"comment": {Values: []string{`kubernetes service traffic requiring SNAT`}},
},
},
},
Jump: &Target{
Name: "MASQUERADE",
Flags: map[string]Flag{
"random-fully": {},
"random": {},
"to-ports": {
Values: []string{"200-1000"},
},
},
},
},
err: nil,
},
{
name: "parse rule with match expression statistic",
s: "-A foo ! -s 192.168.178.2 ! --dst 1.1.1.1 -m statistic --mode random --probability 0.50000000000 --every 10 --packet 5",
r: Rule{
Chain: "foo",
Source: &DNSOrIPPair{
Value: DNSOrIP{
iP: parseCIDR("192.168.178.2"),
},
Not: true,
},
Destination: &DNSOrIPPair{Value: DNSOrIP{iP: parseCIDR("1.1.1.1")}, Not: true},
Matches: []Match{{
Type: "statistic",
Flags: map[string]Flag{
"mode": {
Values: []string{`random`},
},
"probability": {
Values: []string{`0.50000000000`},
},
"packet": {