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gometalinter

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This commit is contained in:
Andrey Meshkov 2019-01-24 20:11:01 +03:00 committed by Eugene Bujak
parent c9d627ea71
commit d078851246
21 changed files with 454 additions and 409 deletions
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4
.gitignore vendored
View file

@ -12,5 +12,5 @@
/scripts/translations/oneskyapp.json
# Test output
dnsfilter/dnsfilter.TestLotsOfRules*.pprof
tests/top-1m.csv
dnsfilter/tests/top-1m.csv
dnsfilter/tests/dnsfilter.TestLotsOfRules*.pprof

40
.gometalinter.json Normal file
View file

@ -0,0 +1,40 @@
{
"Vendor": true,
"Test": true,
"Deadline": "2m",
"Sort": ["linter", "severity", "path", "line"],
"Exclude": [
".*generated.*",
"dnsfilter/rule_to_regexp.go"
],
"EnableGC": true,
"Linters": {
"nakedret": {
"Command": "nakedret",
"Pattern": "^(?P<path>.*?\\.go):(?P<line>\\d+)\\s*(?P<message>.*)$"
}
},
"WarnUnmatchedDirective": true,
"DisableAll": true,
"Enable": [
"deadcode",
"gocyclo",
"gofmt",
"goimports",
"golint",
"gosimple",
"ineffassign",
"interfacer",
"lll",
"misspell",
"nakedret",
"unconvert",
"unparam",
"unused",
"vet"
],
"Cyclo": 20,
"LineLength": 200
}

177
app.go
View file

@ -43,92 +43,7 @@ func main() {
// config can be specified, which reads options from there, but other command line flags have to override config values
// therefore, we must do it manually instead of using a lib
{
var printHelp func()
var configFilename *string
var bindHost *string
var bindPort *int
var opts = []struct {
longName string
shortName string
description string
callbackWithValue func(value string)
callbackNoValue func()
}{
{"config", "c", "path to config file", func(value string) { configFilename = &value }, nil},
{"host", "h", "host address to bind HTTP server on", func(value string) { bindHost = &value }, nil},
{"port", "p", "port to serve HTTP pages on", func(value string) {
v, err := strconv.Atoi(value)
if err != nil {
panic("Got port that is not a number")
}
bindPort = &v
}, nil},
{"verbose", "v", "enable verbose output", nil, func() { log.Verbose = true }},
{"help", "h", "print this help", nil, func() { printHelp(); os.Exit(64) }},
}
printHelp = func() {
fmt.Printf("Usage:\n\n")
fmt.Printf("%s [options]\n\n", os.Args[0])
fmt.Printf("Options:\n")
for _, opt := range opts {
fmt.Printf(" -%s, %-30s %s\n", opt.shortName, "--"+opt.longName, opt.description)
}
}
for i := 1; i < len(os.Args); i++ {
v := os.Args[i]
knownParam := false
for _, opt := range opts {
if v == "--"+opt.longName || v == "-"+opt.shortName {
if opt.callbackWithValue != nil {
if i+1 > len(os.Args) {
log.Printf("ERROR: Got %s without argument\n", v)
os.Exit(64)
}
i++
opt.callbackWithValue(os.Args[i])
} else if opt.callbackNoValue != nil {
opt.callbackNoValue()
}
knownParam = true
break
}
}
if !knownParam {
log.Printf("ERROR: unknown option %v\n", v)
printHelp()
os.Exit(64)
}
}
if configFilename != nil {
config.ourConfigFilename = *configFilename
}
err := askUsernamePasswordIfPossible()
if err != nil {
log.Fatal(err)
}
// Do the upgrade if necessary
err = upgradeConfig()
if err != nil {
log.Fatal(err)
}
// parse from config file
err = parseConfig()
if err != nil {
log.Fatal(err)
}
// override bind host/port from the console
if bindHost != nil {
config.BindHost = *bindHost
}
if bindPort != nil {
config.BindPort = *bindPort
}
}
loadOptions()
// Load filters from the disk
// And if any filter has zero ID, assign a new one
@ -150,7 +65,7 @@ func main() {
// Update filters we've just loaded right away, don't wait for periodic update timer
go func() {
refreshFiltersIfNeccessary(false)
refreshFiltersIfNecessary(false)
// Save the updated config
err := config.write()
if err != nil {
@ -209,6 +124,94 @@ func getInput() (string, error) {
return text, err
}
// loadOptions reads command line arguments and initializes configuration
func loadOptions() {
var printHelp func()
var configFilename *string
var bindHost *string
var bindPort *int
var opts = []struct {
longName string
shortName string
description string
callbackWithValue func(value string)
callbackNoValue func()
}{
{"config", "c", "path to config file", func(value string) { configFilename = &value }, nil},
{"host", "h", "host address to bind HTTP server on", func(value string) { bindHost = &value }, nil},
{"port", "p", "port to serve HTTP pages on", func(value string) {
v, err := strconv.Atoi(value)
if err != nil {
panic("Got port that is not a number")
}
bindPort = &v
}, nil},
{"verbose", "v", "enable verbose output", nil, func() { log.Verbose = true }},
{"help", "h", "print this help", nil, func() { printHelp(); os.Exit(64) }},
}
printHelp = func() {
fmt.Printf("Usage:\n\n")
fmt.Printf("%s [options]\n\n", os.Args[0])
fmt.Printf("Options:\n")
for _, opt := range opts {
fmt.Printf(" -%s, %-30s %s\n", opt.shortName, "--"+opt.longName, opt.description)
}
}
for i := 1; i < len(os.Args); i++ {
v := os.Args[i]
knownParam := false
for _, opt := range opts {
if v == "--"+opt.longName || v == "-"+opt.shortName {
if opt.callbackWithValue != nil {
if i+1 > len(os.Args) {
log.Printf("ERROR: Got %s without argument\n", v)
os.Exit(64)
}
i++
opt.callbackWithValue(os.Args[i])
} else if opt.callbackNoValue != nil {
opt.callbackNoValue()
}
knownParam = true
break
}
}
if !knownParam {
log.Printf("ERROR: unknown option %v\n", v)
printHelp()
os.Exit(64)
}
}
if configFilename != nil {
config.ourConfigFilename = *configFilename
}
err := askUsernamePasswordIfPossible()
if err != nil {
log.Fatal(err)
}
// Do the upgrade if necessary
err = upgradeConfig()
if err != nil {
log.Fatal(err)
}
// parse from config file
err = parseConfig()
if err != nil {
log.Fatal(err)
}
// override bind host/port from the console
if bindHost != nil {
config.BindHost = *bindHost
}
if bindPort != nil {
config.BindPort = *bindPort
}
}
func promptAndGet(prompt string) (string, error) {
for {
fmt.Print(prompt)

6
config.go
View file

@ -21,7 +21,7 @@ const (
// configuration is loaded from YAML
// field ordering is important -- yaml fields will mirror ordering from here
type configuration struct {
ourConfigFilename string // Config filename (can be overriden via the command line arguments)
ourConfigFilename string // Config filename (can be overridden via the command line arguments)
ourBinaryDir string // Location of our directory, used to protect against CWD being somewhere else
BindHost string `yaml:"bind_host"`
@ -41,8 +41,8 @@ type configuration struct {
// field ordering is important -- yaml fields will mirror ordering from here
type dnsConfig struct {
BindHost string `yaml:"bind_host"`
Port int `yaml:"port"`
BindHost string `yaml:"bind_host"`
Port int `yaml:"port"`
dnsforward.FilteringConfig `yaml:",inline"`

119
control.go
View file

@ -40,27 +40,26 @@ func writeAllConfigsAndReloadDNS() error {
log.Printf("Couldn't write all configs: %s", err)
return err
}
reconfigureDNSServer()
return nil
return reconfigureDNSServer()
}
func httpUpdateConfigReloadDNSReturnOK(w http.ResponseWriter, r *http.Request) {
err := writeAllConfigsAndReloadDNS()
if err != nil {
errortext := fmt.Sprintf("Couldn't write config file: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusInternalServerError)
errorText := fmt.Sprintf("Couldn't write config file: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusInternalServerError)
return
}
returnOK(w, r)
returnOK(w)
}
func returnOK(w http.ResponseWriter, r *http.Request) {
func returnOK(w http.ResponseWriter) {
_, err := fmt.Fprintf(w, "OK\n")
if err != nil {
errortext := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusInternalServerError)
errorText := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusInternalServerError)
}
}
@ -79,17 +78,17 @@ func handleStatus(w http.ResponseWriter, r *http.Request) {
jsonVal, err := json.Marshal(data)
if err != nil {
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
return
}
}
@ -147,7 +146,13 @@ func handleSetUpstreamDNS(w http.ResponseWriter, r *http.Request) {
http.Error(w, errorText, http.StatusInternalServerError)
return
}
reconfigureDNSServer()
err = reconfigureDNSServer()
if err != nil {
errorText := fmt.Sprintf("Couldn't reconfigure the DNS server: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusInternalServerError)
return
}
_, err = fmt.Fprintf(w, "OK %d servers\n", len(hosts))
if err != nil {
errorText := fmt.Sprintf("Couldn't write body: %s", err)
@ -206,7 +211,7 @@ func checkDNS(input string) error {
log.Printf("Checking if DNS %s works...", input)
u, err := upstream.AddressToUpstream(input, "", dnsforward.DefaultTimeout)
if err != nil {
return fmt.Errorf("Failed to choose upstream for %s: %s", input, err)
return fmt.Errorf("failed to choose upstream for %s: %s", input, err)
}
req := dns.Msg{}
@ -243,9 +248,9 @@ func handleGetVersionJSON(w http.ResponseWriter, r *http.Request) {
resp, err := client.Get(versionCheckURL)
if err != nil {
errortext := fmt.Sprintf("Couldn't get version check json from %s: %T %s\n", versionCheckURL, err, err)
log.Println(errortext)
http.Error(w, errortext, http.StatusBadGateway)
errorText := fmt.Sprintf("Couldn't get version check json from %s: %T %s\n", versionCheckURL, err, err)
log.Println(errorText)
http.Error(w, errorText, http.StatusBadGateway)
return
}
if resp != nil && resp.Body != nil {
@ -255,18 +260,18 @@ func handleGetVersionJSON(w http.ResponseWriter, r *http.Request) {
// read the body entirely
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
errortext := fmt.Sprintf("Couldn't read response body from %s: %s", versionCheckURL, err)
log.Println(errortext)
http.Error(w, errortext, http.StatusBadGateway)
errorText := fmt.Sprintf("Couldn't read response body from %s: %s", versionCheckURL, err)
log.Println(errorText)
http.Error(w, errorText, http.StatusBadGateway)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(body)
if err != nil {
errortext := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusInternalServerError)
errorText := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusInternalServerError)
}
versionCheckLastTime = now
@ -299,18 +304,18 @@ func handleFilteringStatus(w http.ResponseWriter, r *http.Request) {
config.RUnlock()
if err != nil {
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
return
}
}
@ -378,7 +383,7 @@ func handleFilteringAddURL(w http.ResponseWriter, r *http.Request) {
}
// URL is deemed valid, append it to filters, update config, write new filter file and tell dns to reload it
// TODO: since we directly feed filters in-memory, revisit if writing configs is always neccessary
// TODO: since we directly feed filters in-memory, revisit if writing configs is always necessary
config.Filters = append(config.Filters, filter)
err = writeAllConfigs()
if err != nil {
@ -473,7 +478,7 @@ func handleFilteringEnableURL(w http.ResponseWriter, r *http.Request) {
}
// kick off refresh of rules from new URLs
refreshFiltersIfNeccessary(false)
refreshFiltersIfNecessary(false)
httpUpdateConfigReloadDNSReturnOK(w, r)
}
@ -529,7 +534,7 @@ func handleFilteringSetRules(w http.ResponseWriter, r *http.Request) {
func handleFilteringRefresh(w http.ResponseWriter, r *http.Request) {
force := r.URL.Query().Get("force")
updated := refreshFiltersIfNeccessary(force != "")
updated := refreshFiltersIfNecessary(force != "")
fmt.Fprintf(w, "OK %d filters updated\n", updated)
}
@ -553,17 +558,17 @@ func handleSafeBrowsingStatus(w http.ResponseWriter, r *http.Request) {
}
jsonVal, err := json.Marshal(data)
if err != nil {
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
return
}
}
@ -574,9 +579,9 @@ func handleSafeBrowsingStatus(w http.ResponseWriter, r *http.Request) {
func handleParentalEnable(w http.ResponseWriter, r *http.Request) {
parameters, err := parseParametersFromBody(r.Body)
if err != nil {
errortext := fmt.Sprintf("failed to parse parameters from body: %s", err)
log.Println(errortext)
http.Error(w, errortext, 400)
errorText := fmt.Sprintf("failed to parse parameters from body: %s", err)
log.Println(errorText)
http.Error(w, errorText, 400)
return
}
@ -631,18 +636,18 @@ func handleParentalStatus(w http.ResponseWriter, r *http.Request) {
}
jsonVal, err := json.Marshal(data)
if err != nil {
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
return
}
}
@ -667,18 +672,18 @@ func handleSafeSearchStatus(w http.ResponseWriter, r *http.Request) {
}
jsonVal, err := json.Marshal(data)
if err != nil {
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsonVal)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
return
}
}

10
dhcp.go
View file

@ -58,7 +58,10 @@ func handleDHCPSetConfig(w http.ResponseWriter, r *http.Request) {
}
}
if !newconfig.Enabled {
dhcpServer.Stop()
err := dhcpServer.Stop()
if err != nil {
log.Printf("failed to stop the DHCP server: %s", err)
}
}
config.DHCP = newconfig
httpUpdateConfigReloadDNSReturnOK(w, r)
@ -73,11 +76,6 @@ func handleDHCPInterfaces(w http.ResponseWriter, r *http.Request) {
return
}
type address struct {
IP string
Netmask string
}
type responseInterface struct {
Name string `json:"name"`
MTU int `json:"mtu"`

20
dhcpd/check_other_dhcp.go
View file

@ -13,6 +13,8 @@ import (
"github.com/krolaw/dhcp4"
)
// CheckIfOtherDHCPServersPresent sends a DHCP request to the specified network interface,
// and waits for a response for a period defined by defaultDiscoverTime
func CheckIfOtherDHCPServersPresent(ifaceName string) (bool, error) {
iface, err := net.InterfaceByName(ifaceName)
if err != nil {
@ -30,8 +32,8 @@ func CheckIfOtherDHCPServersPresent(ifaceName string) (bool, error) {
dst := "255.255.255.255:67"
// form a DHCP request packet, try to emulate existing client as much as possible
xId := make([]byte, 8)
n, err := rand.Read(xId)
xID := make([]byte, 8)
n, err := rand.Read(xID)
if n != 8 && err == nil {
err = fmt.Errorf("Generated less than 8 bytes")
}
@ -60,13 +62,13 @@ func CheckIfOtherDHCPServersPresent(ifaceName string) (bool, error) {
leaseTime := uint32(math.RoundToEven(time.Duration(time.Hour * 24 * 90).Seconds()))
binary.BigEndian.PutUint32(leaseTimeRaw, leaseTime)
options := []dhcp4.Option{
{dhcp4.OptionParameterRequestList, requestList},
{dhcp4.OptionMaximumDHCPMessageSize, maxUDPsizeRaw},
{dhcp4.OptionClientIdentifier, append([]byte{0x01}, iface.HardwareAddr...)},
{dhcp4.OptionIPAddressLeaseTime, leaseTimeRaw},
{dhcp4.OptionHostName, []byte(hostname)},
{Code: dhcp4.OptionParameterRequestList, Value: requestList},
{Code: dhcp4.OptionMaximumDHCPMessageSize, Value: maxUDPsizeRaw},
{Code: dhcp4.OptionClientIdentifier, Value: append([]byte{0x01}, iface.HardwareAddr...)},
{Code: dhcp4.OptionIPAddressLeaseTime, Value: leaseTimeRaw},
{Code: dhcp4.OptionHostName, Value: []byte(hostname)},
}
packet := dhcp4.RequestPacket(dhcp4.Discover, iface.HardwareAddr, nil, xId, false, options)
packet := dhcp4.RequestPacket(dhcp4.Discover, iface.HardwareAddr, nil, xID, false, options)
// resolve 0.0.0.0:68
udpAddr, err := net.ResolveUDPAddr("udp4", src)
@ -98,7 +100,7 @@ func CheckIfOtherDHCPServersPresent(ifaceName string) (bool, error) {
}
// send to 255.255.255.255:67
n, err = c.WriteTo(packet, dstAddr)
_, err = c.WriteTo(packet, dstAddr)
// spew.Dump(n, err)
if err != nil {
return false, wrapErrPrint(err, "Couldn't send a packet to %s", dst)

169
dhcpd/dhcpd.go
View file

@ -13,6 +13,7 @@ import (
const defaultDiscoverTime = time.Second * 3
// Lease contains the necessary information about a DHCP lease
// field ordering is important -- yaml fields will mirror ordering from here
type Lease struct {
HWAddr net.HardwareAddr `json:"mac" yaml:"hwaddr"`
@ -21,6 +22,7 @@ type Lease struct {
Expiry time.Time `json:"expires"`
}
// ServerConfig - DHCP server configuration
// field ordering is important -- yaml fields will mirror ordering from here
type ServerConfig struct {
Enabled bool `json:"enabled" yaml:"enabled"`
@ -32,6 +34,7 @@ type ServerConfig struct {
LeaseDuration uint `json:"lease_duration" yaml:"lease_duration"` // in seconds
}
// Server - the current state of the DHCP server
type Server struct {
conn *filterConn // listening UDP socket
@ -137,6 +140,7 @@ func (s *Server) Start(config *ServerConfig) error {
return nil
}
// Stop closes the listening UDP socket
func (s *Server) Stop() error {
if s.conn == nil {
// nothing to do, return silently
@ -249,6 +253,7 @@ func (s *Server) unreserveIP(ip net.IP) {
delete(s.IPpool, IP4)
}
// ServeDHCP handles an incoming DHCP request
func (s *Server) ServeDHCP(p dhcp4.Packet, msgType dhcp4.MessageType, options dhcp4.Options) dhcp4.Packet {
log.Tracef("Got %v message", msgType)
log.Tracef("Leases:")
@ -259,27 +264,6 @@ func (s *Server) ServeDHCP(p dhcp4.Packet, msgType dhcp4.MessageType, options dh
for ip, hwaddr := range s.IPpool {
log.Tracef("IP pool entry %s -> %s", net.IPv4(ip[0], ip[1], ip[2], ip[3]), hwaddr)
}
// spew.Dump(s.leases, s.IPpool)
// log.Printf("Called with msgType = %v, options = %+v", msgType, options)
// spew.Dump(p)
// log.Printf("%14s %v", "p.Broadcast", p.Broadcast()) // false
// log.Printf("%14s %v", "p.CHAddr", p.CHAddr()) // 2c:f0:a2:f2:31:00
// log.Printf("%14s %v", "p.CIAddr", p.CIAddr()) // 0.0.0.0
// log.Printf("%14s %v", "p.Cookie", p.Cookie()) // [99 130 83 99]
// log.Printf("%14s %v", "p.File", p.File()) // []
// log.Printf("%14s %v", "p.Flags", p.Flags()) // [0 0]
// log.Printf("%14s %v", "p.GIAddr", p.GIAddr()) // 0.0.0.0
// log.Printf("%14s %v", "p.HLen", p.HLen()) // 6
// log.Printf("%14s %v", "p.HType", p.HType()) // 1
// log.Printf("%14s %v", "p.Hops", p.Hops()) // 0
// log.Printf("%14s %v", "p.OpCode", p.OpCode()) // BootRequest
// log.Printf("%14s %v", "p.Options", p.Options()) // [53 1 1 55 10 1 121 3 6 15 119 252 95 44 46 57 2 5 220 61 7 1 44 240 162 242 49 0 51 4 0 118 167 0 12 4 119 104 109 100 255 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
// log.Printf("%14s %v", "p.ParseOptions", p.ParseOptions()) // map[OptionParameterRequestList:[1 121 3 6 15 119 252 95 44 46] OptionDHCPMessageType:[1] OptionMaximumDHCPMessageSize:[5 220] OptionClientIdentifier:[1 44 240 162 242 49 0] OptionIPAddressLeaseTime:[0 118 167 0] OptionHostName:[119 104 109 100]]
// log.Printf("%14s %v", "p.SIAddr", p.SIAddr()) // 0.0.0.0
// log.Printf("%14s %v", "p.SName", p.SName()) // []
// log.Printf("%14s %v", "p.Secs", p.Secs()) // [0 8]
// log.Printf("%14s %v", "p.XId", p.XId()) // [211 184 20 44]
// log.Printf("%14s %v", "p.YIAddr", p.YIAddr()) // 0.0.0.0
switch msgType {
case dhcp4.Discover: // Broadcast Packet From Client - Can I have an IP?
@ -297,75 +281,7 @@ func (s *Server) ServeDHCP(p dhcp4.Packet, msgType dhcp4.MessageType, options dh
case dhcp4.Request: // Broadcast From Client - I'll take that IP (Also start for renewals)
// start/renew a lease -- update lease time
// some clients (OSX) just go right ahead and do Request first from previously known IP, if they get NAK, they restart full cycle with Discover then Request
log.Tracef("Got from client: Request")
if server, ok := options[dhcp4.OptionServerIdentifier]; ok && !net.IP(server).Equal(s.ipnet.IP) {
log.Tracef("Request message not for this DHCP server (%v vs %v)", server, s.ipnet.IP)
return nil // Message not for this dhcp server
}
reqIP := net.IP(options[dhcp4.OptionRequestedIPAddress])
if reqIP == nil {
reqIP = net.IP(p.CIAddr())
}
if reqIP.To4() == nil {
log.Tracef("Replying with NAK: request IP isn't valid IPv4: %s", reqIP)
return dhcp4.ReplyPacket(p, dhcp4.NAK, s.ipnet.IP, nil, 0, nil)
}
if reqIP.Equal(net.IPv4zero) {
log.Tracef("Replying with NAK: request IP is 0.0.0.0")
return dhcp4.ReplyPacket(p, dhcp4.NAK, s.ipnet.IP, nil, 0, nil)
}
log.Tracef("requested IP is %s", reqIP)
lease, err := s.reserveLease(p)
if err != nil {
log.Tracef("Couldn't find free lease: %s", err)
// couldn't find lease, don't respond
return nil
}
if lease.IP.Equal(reqIP) {
// IP matches lease IP, nothing else to do
lease.Expiry = time.Now().Add(s.leaseTime)
log.Tracef("Replying with ACK: request IP matches lease IP, nothing else to do. IP %v for %v", lease.IP, p.CHAddr())
return dhcp4.ReplyPacket(p, dhcp4.ACK, s.ipnet.IP, lease.IP, s.leaseTime, s.leaseOptions.SelectOrderOrAll(options[dhcp4.OptionParameterRequestList]))
}
//
// requested IP different from lease
//
log.Tracef("lease IP is different from requested IP: %s vs %s", lease.IP, reqIP)
hwaddr := s.getIPpool(reqIP)
if hwaddr == nil {
// not in pool, check if it's in DHCP range
if dhcp4.IPInRange(s.leaseStart, s.leaseStop, reqIP) {
// okay, we can give it to our client -- it's in our DHCP range and not taken, so let them use their IP
log.Tracef("Replying with ACK: request IP %v is not taken, so assigning lease IP %v to it, for %v", reqIP, lease.IP, p.CHAddr())
s.unreserveIP(lease.IP)
lease.IP = reqIP
s.reserveIP(reqIP, p.CHAddr())
lease.Expiry = time.Now().Add(s.leaseTime)
return dhcp4.ReplyPacket(p, dhcp4.ACK, s.ipnet.IP, lease.IP, s.leaseTime, s.leaseOptions.SelectOrderOrAll(options[dhcp4.OptionParameterRequestList]))
}
}
if hwaddr != nil && !bytes.Equal(hwaddr, lease.HWAddr) {
log.Printf("SHOULD NOT HAPPEN: IP pool hwaddr does not match lease hwaddr: %s vs %s", hwaddr, lease.HWAddr)
}
// requsted IP is not sufficient, reply with NAK
if hwaddr != nil {
log.Tracef("Replying with NAK: request IP %s is taken, asked by %v", reqIP, p.CHAddr())
return dhcp4.ReplyPacket(p, dhcp4.NAK, s.ipnet.IP, nil, 0, nil)
}
// requested IP is outside of DHCP range
log.Tracef("Replying with NAK: request IP %s is outside of DHCP range [%s, %s], asked by %v", reqIP, s.leaseStart, s.leaseStop, p.CHAddr())
return dhcp4.ReplyPacket(p, dhcp4.NAK, s.ipnet.IP, nil, 0, nil)
return s.handleDHCP4Request(p, msgType, options)
case dhcp4.Decline: // Broadcast From Client - Sorry I can't use that IP
log.Tracef("Got from client: Decline")
@ -390,6 +306,79 @@ func (s *Server) ServeDHCP(p dhcp4.Packet, msgType dhcp4.MessageType, options dh
return nil
}
func (s *Server) handleDHCP4Request(p dhcp4.Packet, msgType dhcp4.MessageType, options dhcp4.Options) dhcp4.Packet {
log.Tracef("Got from client: Request")
if server, ok := options[dhcp4.OptionServerIdentifier]; ok && !net.IP(server).Equal(s.ipnet.IP) {
log.Tracef("Request message not for this DHCP server (%v vs %v)", server, s.ipnet.IP)
return nil // Message not for this dhcp server
}
reqIP := net.IP(options[dhcp4.OptionRequestedIPAddress])
if reqIP == nil {
reqIP = net.IP(p.CIAddr())
}
if reqIP.To4() == nil {
log.Tracef("Replying with NAK: request IP isn't valid IPv4: %s", reqIP)
return dhcp4.ReplyPacket(p, dhcp4.NAK, s.ipnet.IP, nil, 0, nil)
}
if reqIP.Equal(net.IPv4zero) {
log.Tracef("Replying with NAK: request IP is 0.0.0.0")
return dhcp4.ReplyPacket(p, dhcp4.NAK, s.ipnet.IP, nil, 0, nil)
}
log.Tracef("requested IP is %s", reqIP)
lease, err := s.reserveLease(p)
if err != nil {
log.Tracef("Couldn't find free lease: %s", err)
// couldn't find lease, don't respond
return nil
}
if lease.IP.Equal(reqIP) {
// IP matches lease IP, nothing else to do
lease.Expiry = time.Now().Add(s.leaseTime)
log.Tracef("Replying with ACK: request IP matches lease IP, nothing else to do. IP %v for %v", lease.IP, p.CHAddr())
return dhcp4.ReplyPacket(p, dhcp4.ACK, s.ipnet.IP, lease.IP, s.leaseTime, s.leaseOptions.SelectOrderOrAll(options[dhcp4.OptionParameterRequestList]))
}
//
// requested IP different from lease
//
log.Tracef("lease IP is different from requested IP: %s vs %s", lease.IP, reqIP)
hwaddr := s.getIPpool(reqIP)
if hwaddr == nil {
// not in pool, check if it's in DHCP range
if dhcp4.IPInRange(s.leaseStart, s.leaseStop, reqIP) {
// okay, we can give it to our client -- it's in our DHCP range and not taken, so let them use their IP
log.Tracef("Replying with ACK: request IP %v is not taken, so assigning lease IP %v to it, for %v", reqIP, lease.IP, p.CHAddr())
s.unreserveIP(lease.IP)
lease.IP = reqIP
s.reserveIP(reqIP, p.CHAddr())
lease.Expiry = time.Now().Add(s.leaseTime)
return dhcp4.ReplyPacket(p, dhcp4.ACK, s.ipnet.IP, lease.IP, s.leaseTime, s.leaseOptions.SelectOrderOrAll(options[dhcp4.OptionParameterRequestList]))
}
}
if hwaddr != nil && !bytes.Equal(hwaddr, lease.HWAddr) {
log.Printf("SHOULD NOT HAPPEN: IP pool hwaddr does not match lease hwaddr: %s vs %s", hwaddr, lease.HWAddr)
}
// requsted IP is not sufficient, reply with NAK
if hwaddr != nil {
log.Tracef("Replying with NAK: request IP %s is taken, asked by %v", reqIP, p.CHAddr())
return dhcp4.ReplyPacket(p, dhcp4.NAK, s.ipnet.IP, nil, 0, nil)
}
// requested IP is outside of DHCP range
log.Tracef("Replying with NAK: request IP %s is outside of DHCP range [%s, %s], asked by %v", reqIP, s.leaseStart, s.leaseStop, p.CHAddr())
return dhcp4.ReplyPacket(p, dhcp4.NAK, s.ipnet.IP, nil, 0, nil)
}
// Leases returns the list of current DHCP leases
func (s *Server) Leases() []*Lease {
s.RLock()
result := s.leases

3
dhcpd/filter_conn.go
View file

@ -8,7 +8,7 @@ import (
)
// filterConn listens to 0.0.0.0:67, but accepts packets only from specific interface
// This is neccessary for DHCP daemon to work, since binding to IP address doesn't
// This is necessary for DHCP daemon to work, since binding to IP address doesn't
// us access to see Discover/Request packets from clients.
//
// TODO: on windows, controlmessage does not work, try to find out another way
@ -49,7 +49,6 @@ func (f *filterConn) ReadFrom(b []byte) (int, net.Addr, error) {
}
// packet doesn't match criteria, drop it
}
return 0, nil, nil
}
func (f *filterConn) WriteTo(b []byte, addr net.Addr) (int, error) {

17
dhcpd/helpers.go
View file

@ -3,7 +3,6 @@ package dhcpd
import (
"fmt"
"net"
"strings"
"github.com/hmage/golibs/log"
"github.com/joomcode/errorx"
@ -45,22 +44,6 @@ func getIfaceIPv4(iface *net.Interface) *net.IPNet {
return nil
}
func isConnClosed(err error) bool {
if err == nil {
return false
}
nerr, ok := err.(*net.OpError)
if !ok {
return false
}
if strings.Contains(nerr.Err.Error(), "use of closed network connection") {
return true
}
return false
}
func wrapErrPrint(err error, message string, args ...interface{}) error {
var errx error
if err == nil {

4
dns.go
View file

@ -39,13 +39,13 @@ func generateServerConfig() dnsforward.ServerConfig {
}
for _, u := range config.DNS.UpstreamDNS {
upstream, err := upstream.AddressToUpstream(u, config.DNS.BootstrapDNS, dnsforward.DefaultTimeout)
dnsUpstream, err := upstream.AddressToUpstream(u, config.DNS.BootstrapDNS, dnsforward.DefaultTimeout)
if err != nil {
log.Printf("Couldn't get upstream: %s", err)
// continue, just ignore the upstream
continue
}
newconfig.Upstreams = append(newconfig.Upstreams, upstream)
newconfig.Upstreams = append(newconfig.Upstreams, dnsUpstream)
}
return newconfig
}

48
dnsfilter/dnsfilter.go
View file

@ -35,7 +35,7 @@ const defaultParentalURL = "http://%s/check-parental-control-hash?prefixes=%s&se
// ErrInvalidSyntax is returned by AddRule when the rule is invalid
var ErrInvalidSyntax = errors.New("dnsfilter: invalid rule syntax")
// ErrInvalidSyntax is returned by AddRule when the rule was already added to the filter
// ErrAlreadyExists is returned by AddRule when the rule was already added to the filter
var ErrAlreadyExists = errors.New("dnsfilter: rule was already added")
const shortcutLength = 6 // used for rule search optimization, 6 hits the sweet spot
@ -115,6 +115,7 @@ type Dnsfilter struct {
privateConfig
}
// Filter represents a filter list
type Filter struct {
ID int64 `json:"id"` // auto-assigned when filter is added (see nextFilterID), json by default keeps ID uppercase but we need lowercase
Rules []string `json:"-" yaml:"-"` // not in yaml or json
@ -127,16 +128,26 @@ type Reason int
const (
// reasons for not filtering
NotFilteredNotFound Reason = iota // host was not find in any checks, default value for result
NotFilteredWhiteList // the host is explicitly whitelisted
NotFilteredError // there was a transitive error during check
// NotFilteredNotFound - host was not find in any checks, default value for result
NotFilteredNotFound Reason = iota
// NotFilteredWhiteList - the host is explicitly whitelisted
NotFilteredWhiteList
// NotFilteredError - there was a transitive error during check
NotFilteredError
// reasons for filtering
FilteredBlackList // the host was matched to be advertising host
FilteredSafeBrowsing // the host was matched to be malicious/phishing
FilteredParental // the host was matched to be outside of parental control settings
FilteredInvalid // the request was invalid and was not processed
FilteredSafeSearch // the host was replaced with safesearch variant
// FilteredBlackList - the host was matched to be advertising host
FilteredBlackList
// FilteredSafeBrowsing - the host was matched to be malicious/phishing
FilteredSafeBrowsing
// FilteredParental - the host was matched to be outside of parental control settings
FilteredParental
// FilteredInvalid - the request was invalid and was not processed
FilteredInvalid
// FilteredSafeSearch - the host was replaced with safesearch variant
FilteredSafeSearch
)
// these variables need to survive coredns reload
@ -151,7 +162,7 @@ type Result struct {
IsFiltered bool `json:",omitempty"` // True if the host name is filtered
Reason Reason `json:",omitempty"` // Reason for blocking / unblocking
Rule string `json:",omitempty"` // Original rule text
Ip net.IP `json:",omitempty"` // Not nil only in the case of a hosts file syntax
IP net.IP `json:",omitempty"` // Not nil only in the case of a hosts file syntax
FilterID int64 `json:",omitempty"` // Filter ID the rule belongs to
}
@ -228,7 +239,6 @@ func newRulesTable() *rulesTable {
func (r *rulesTable) Add(rule *rule) {
r.Lock()
if rule.ip != nil {
// Hosts syntax
r.rulesByHost[rule.text] = rule
@ -476,7 +486,7 @@ func (rule *rule) match(host string) (Result, error) {
IsFiltered: true,
Reason: FilteredBlackList,
Rule: rule.originalText,
Ip: rule.ip,
IP: rule.ip,
FilterID: rule.listID,
}, nil
}
@ -661,8 +671,11 @@ func (d *Dnsfilter) checkParental(host string) (Result, error) {
return result, err
}
type formatHandler func(hashparam string) string
type handleBodyHandler func(body []byte, hashes map[string]bool) (Result, error)
// real implementation of lookup/check
func (d *Dnsfilter) lookupCommon(host string, lookupstats *LookupStats, cache gcache.Cache, hashparamNeedSlash bool, format func(hashparam string) string, handleBody func(body []byte, hashes map[string]bool) (Result, error)) (Result, error) {
func (d *Dnsfilter) lookupCommon(host string, lookupstats *LookupStats, cache gcache.Cache, hashparamNeedSlash bool, format formatHandler, handleBody handleBodyHandler) (Result, error) {
// if host ends with a dot, trim it
host = strings.ToLower(strings.Trim(host, "."))
@ -913,15 +926,6 @@ func (d *Dnsfilter) Destroy() {
// config manipulation helpers
//
// IsParentalSensitivityValid checks if sensitivity is valid value
func IsParentalSensitivityValid(sensitivity int) bool {
switch sensitivity {
case 3, 10, 13, 17:
return true
}
return false
}
// SetSafeBrowsingServer lets you optionally change hostname of safesearch lookup
func (d *Dnsfilter) SetSafeBrowsingServer(host string) {
if len(host) == 0 {

31
dnsfilter/dnsfilter_test.go
View file

@ -26,7 +26,7 @@ import (
func TestLotsOfRulesMemoryUsage(t *testing.T) {
start := getRSS()
log.Tracef("RSS before loading rules - %d kB\n", start/1024)
dumpMemProfile(_Func() + "1.pprof")
dumpMemProfile("tests/" + _Func() + "1.pprof")
d := NewForTest()
defer d.Destroy()
@ -37,7 +37,7 @@ func TestLotsOfRulesMemoryUsage(t *testing.T) {
afterLoad := getRSS()
log.Tracef("RSS after loading rules - %d kB (%d kB diff)\n", afterLoad/1024, (afterLoad-start)/1024)
dumpMemProfile(_Func() + "2.pprof")
dumpMemProfile("tests/" + _Func() + "2.pprof")
tests := []struct {
host string
@ -60,7 +60,7 @@ func TestLotsOfRulesMemoryUsage(t *testing.T) {
}
afterMatch := getRSS()
log.Tracef("RSS after matching - %d kB (%d kB diff)\n", afterMatch/1024, (afterMatch-afterLoad)/1024)
dumpMemProfile(_Func() + "3.pprof")
dumpMemProfile("tests/" + _Func() + "3.pprof")
}
func getRSS() uint64 {
@ -69,6 +69,9 @@ func getRSS() uint64 {
panic(err)
}
minfo, err := proc.MemoryInfo()
if err != nil {
panic(err)
}
return minfo.RSS
}
@ -86,7 +89,7 @@ func dumpMemProfile(name string) {
}
}
const topHostsFilename = "../tests/top-1m.csv"
const topHostsFilename = "tests/top-1m.csv"
func fetchTopHostsFromNet() {
log.Tracef("Fetching top hosts from network")
@ -146,7 +149,7 @@ func getTopHosts() {
func TestLotsOfRulesLotsOfHostsMemoryUsage(t *testing.T) {
start := getRSS()
log.Tracef("RSS before loading rules - %d kB\n", start/1024)
dumpMemProfile(_Func() + "1.pprof")
dumpMemProfile("tests/" + _Func() + "1.pprof")
d := NewForTest()
defer d.Destroy()
@ -155,7 +158,7 @@ func TestLotsOfRulesLotsOfHostsMemoryUsage(t *testing.T) {
afterLoad := getRSS()
log.Tracef("RSS after loading rules - %d kB (%d kB diff)\n", afterLoad/1024, (afterLoad-start)/1024)
dumpMemProfile(_Func() + "2.pprof")
dumpMemProfile("tests/" + _Func() + "2.pprof")
getTopHosts()
hostnames, err := os.Open(topHostsFilename)
@ -165,7 +168,7 @@ func TestLotsOfRulesLotsOfHostsMemoryUsage(t *testing.T) {
defer hostnames.Close()
afterHosts := getRSS()
log.Tracef("RSS after loading hosts - %d kB (%d kB diff)\n", afterHosts/1024, (afterHosts-afterLoad)/1024)
dumpMemProfile(_Func() + "2.pprof")
dumpMemProfile("tests/" + _Func() + "2.pprof")
{
scanner := bufio.NewScanner(hostnames)
@ -184,7 +187,7 @@ func TestLotsOfRulesLotsOfHostsMemoryUsage(t *testing.T) {
afterMatch := getRSS()
log.Tracef("RSS after matching - %d kB (%d kB diff)\n", afterMatch/1024, (afterMatch-afterLoad)/1024)
dumpMemProfile(_Func() + "3.pprof")
dumpMemProfile("tests/" + _Func() + "3.pprof")
}
func TestRuleToRegexp(t *testing.T) {
@ -282,7 +285,7 @@ func (d *Dnsfilter) checkMatch(t *testing.T, hostname string) {
}
}
func (d *Dnsfilter) checkMatchIp(t *testing.T, hostname string, ip string) {
func (d *Dnsfilter) checkMatchIP(t *testing.T, hostname string, ip string) {
t.Helper()
ret, err := d.CheckHost(hostname)
if err != nil {
@ -291,8 +294,8 @@ func (d *Dnsfilter) checkMatchIp(t *testing.T, hostname string, ip string) {
if !ret.IsFiltered {
t.Errorf("Expected hostname %s to match", hostname)
}
if ret.Ip == nil || ret.Ip.String() != ip {
t.Errorf("Expected ip %s to match, actual: %v", ip, ret.Ip)
if ret.IP == nil || ret.IP.String() != ip {
t.Errorf("Expected ip %s to match, actual: %v", ip, ret.IP)
}
}
@ -308,7 +311,7 @@ func (d *Dnsfilter) checkMatchEmpty(t *testing.T, hostname string) {
}
func loadTestRules(d *Dnsfilter) error {
filterFileName := "../tests/dns.txt"
filterFileName := "tests/dns.txt"
file, err := os.Open(filterFileName)
if err != nil {
return err
@ -368,8 +371,8 @@ func TestEtcHostsMatching(t *testing.T) {
text := fmt.Sprintf(" %s google.com www.google.com # enforce google's safesearch ", addr)
d.checkAddRule(t, text)
d.checkMatchIp(t, "google.com", addr)
d.checkMatchIp(t, "www.google.com", addr)
d.checkMatchIP(t, "google.com", addr)
d.checkMatchIP(t, "www.google.com", addr)
d.checkMatchEmpty(t, "subdomain.google.com")
d.checkMatchEmpty(t, "example.org")
}

0
tests/dns.txt → dnsfilter/tests/dns.txt
View file

4
dnsforward/dnsforward.go
View file

@ -310,8 +310,8 @@ func (s *Server) genDNSFilterMessage(d *proxy.DNSContext, result *dnsfilter.Resu
case dnsfilter.FilteredParental:
return s.genBlockedHost(m, parentalBlockHost, d.Upstream)
default:
if result.Ip != nil {
return s.genARecord(m, result.Ip)
if result.IP != nil {
return s.genARecord(m, result.IP)
}
return s.genNXDomain(m)

92
dnsforward/querylog.go
View file

@ -112,6 +112,7 @@ func logRequest(question *dns.Msg, answer *dns.Msg, result *dnsfilter.Result, el
}
}
// HandleQueryLog handles query log web request
func HandleQueryLog(w http.ResponseWriter, r *http.Request) {
queryLogLock.RLock()
values := make([]*logEntry, len(queryLogCache))
@ -123,6 +124,7 @@ func HandleQueryLog(w http.ResponseWriter, r *http.Request) {
values[left], values[right] = values[right], values[left]
}
// iterate
var data = []map[string]interface{}{}
for _, entry := range values {
var q *dns.Msg
@ -167,46 +169,8 @@ func HandleQueryLog(w http.ResponseWriter, r *http.Request) {
jsonEntry["filterId"] = entry.Result.FilterID
}
if a != nil && len(a.Answer) > 0 {
var answers = []map[string]interface{}{}
for _, k := range a.Answer {
header := k.Header()
answer := map[string]interface{}{
"type": dns.TypeToString[header.Rrtype],
"ttl": header.Ttl,
}
// try most common record types
switch v := k.(type) {
case *dns.A:
answer["value"] = v.A
case *dns.AAAA:
answer["value"] = v.AAAA
case *dns.MX:
answer["value"] = fmt.Sprintf("%v %v", v.Preference, v.Mx)
case *dns.CNAME:
answer["value"] = v.Target
case *dns.NS:
answer["value"] = v.Ns
case *dns.SPF:
answer["value"] = v.Txt
case *dns.TXT:
answer["value"] = v.Txt
case *dns.PTR:
answer["value"] = v.Ptr
case *dns.SOA:
answer["value"] = fmt.Sprintf("%v %v %v %v %v %v %v", v.Ns, v.Mbox, v.Serial, v.Refresh, v.Retry, v.Expire, v.Minttl)
case *dns.CAA:
answer["value"] = fmt.Sprintf("%v %v \"%v\"", v.Flag, v.Tag, v.Value)
case *dns.HINFO:
answer["value"] = fmt.Sprintf("\"%v\" \"%v\"", v.Cpu, v.Os)
case *dns.RRSIG:
answer["value"] = fmt.Sprintf("%v %v %v %v %v %v %v %v %v", dns.TypeToString[v.TypeCovered], v.Algorithm, v.Labels, v.OrigTtl, v.Expiration, v.Inception, v.KeyTag, v.SignerName, v.Signature)
default:
// type unknown, marshall it as-is
answer["value"] = v
}
answers = append(answers, answer)
}
answers := answerToMap(a)
if answers != nil {
jsonEntry["answer"] = answers
}
@ -230,6 +194,54 @@ func HandleQueryLog(w http.ResponseWriter, r *http.Request) {
}
}
func answerToMap(a *dns.Msg) []map[string]interface{} {
if a == nil || len(a.Answer) == 0 {
return nil
}
var answers = []map[string]interface{}{}
for _, k := range a.Answer {
header := k.Header()
answer := map[string]interface{}{
"type": dns.TypeToString[header.Rrtype],
"ttl": header.Ttl,
}
// try most common record types
switch v := k.(type) {
case *dns.A:
answer["value"] = v.A
case *dns.AAAA:
answer["value"] = v.AAAA
case *dns.MX:
answer["value"] = fmt.Sprintf("%v %v", v.Preference, v.Mx)
case *dns.CNAME:
answer["value"] = v.Target
case *dns.NS:
answer["value"] = v.Ns
case *dns.SPF:
answer["value"] = v.Txt
case *dns.TXT:
answer["value"] = v.Txt
case *dns.PTR:
answer["value"] = v.Ptr
case *dns.SOA:
answer["value"] = fmt.Sprintf("%v %v %v %v %v %v %v", v.Ns, v.Mbox, v.Serial, v.Refresh, v.Retry, v.Expire, v.Minttl)
case *dns.CAA:
answer["value"] = fmt.Sprintf("%v %v \"%v\"", v.Flag, v.Tag, v.Value)
case *dns.HINFO:
answer["value"] = fmt.Sprintf("\"%v\" \"%v\"", v.Cpu, v.Os)
case *dns.RRSIG:
answer["value"] = fmt.Sprintf("%v %v %v %v %v %v %v %v %v", dns.TypeToString[v.TypeCovered], v.Algorithm, v.Labels, v.OrigTtl, v.Expiration, v.Inception, v.KeyTag, v.SignerName, v.Signature)
default:
// type unknown, marshall it as-is
answer["value"] = v
}
answers = append(answers, answer)
}
return answers
}
// getIPString is a helper function that extracts IP address from net.Addr
func getIPString(addr net.Addr) string {
switch addr := addr.(type) {

2
dnsforward/querylog_file.go
View file

@ -156,7 +156,7 @@ func periodicQueryLogRotate() {
func genericLoader(onEntry func(entry *logEntry) error, needMore func() bool, timeWindow time.Duration) error {
now := time.Now()
// read from querylog files, try newest file first
files := []string{}
var files []string
if enableGzip {
files = []string{

49
dnsforward/querylog_top.go
View file

@ -26,10 +26,10 @@ type hourTop struct {
mutex sync.RWMutex
}
func (top *hourTop) init() {
top.domains = gcache.New(queryLogTopSize).LRU().Build()
top.blocked = gcache.New(queryLogTopSize).LRU().Build()
top.clients = gcache.New(queryLogTopSize).LRU().Build()
func (h *hourTop) init() {
h.domains = gcache.New(queryLogTopSize).LRU().Build()
h.blocked = gcache.New(queryLogTopSize).LRU().Build()
h.clients = gcache.New(queryLogTopSize).LRU().Build()
}
type dayTop struct {
@ -69,9 +69,9 @@ func periodicHourlyTopRotate() {
}
}
func (top *hourTop) incrementValue(key string, cache gcache.Cache) error {
top.Lock()
defer top.Unlock()
func (h *hourTop) incrementValue(key string, cache gcache.Cache) error {
h.Lock()
defer h.Unlock()
ivalue, err := cache.Get(key)
if err == gcache.KeyNotFoundError {
// we just set it and we're done
@ -103,20 +103,20 @@ func (top *hourTop) incrementValue(key string, cache gcache.Cache) error {
return nil
}
func (top *hourTop) incrementDomains(key string) error {
return top.incrementValue(key, top.domains)
func (h *hourTop) incrementDomains(key string) error {
return h.incrementValue(key, h.domains)
}
func (top *hourTop) incrementBlocked(key string) error {
return top.incrementValue(key, top.blocked)
func (h *hourTop) incrementBlocked(key string) error {
return h.incrementValue(key, h.blocked)
}
func (top *hourTop) incrementClients(key string) error {
return top.incrementValue(key, top.clients)
func (h *hourTop) incrementClients(key string) error {
return h.incrementValue(key, h.clients)
}
// if does not exist -- return 0
func (top *hourTop) lockedGetValue(key string, cache gcache.Cache) (int, error) {
func (h *hourTop) lockedGetValue(key string, cache gcache.Cache) (int, error) {
ivalue, err := cache.Get(key)
if err == gcache.KeyNotFoundError {
return 0, nil
@ -137,19 +137,19 @@ func (top *hourTop) lockedGetValue(key string, cache gcache.Cache) (int, error)
return value, nil
}
func (top *hourTop) lockedGetDomains(key string) (int, error) {
return top.lockedGetValue(key, top.domains)
func (h *hourTop) lockedGetDomains(key string) (int, error) {
return h.lockedGetValue(key, h.domains)
}
func (top *hourTop) lockedGetBlocked(key string) (int, error) {
return top.lockedGetValue(key, top.blocked)
func (h *hourTop) lockedGetBlocked(key string) (int, error) {
return h.lockedGetValue(key, h.blocked)
}
func (top *hourTop) lockedGetClients(key string) (int, error) {
return top.lockedGetValue(key, top.clients)
func (h *hourTop) lockedGetClients(key string) (int, error) {
return h.lockedGetValue(key, h.clients)
}
func (r *dayTop) addEntry(entry *logEntry, q *dns.Msg, now time.Time) error {
func (d *dayTop) addEntry(entry *logEntry, q *dns.Msg, now time.Time) error {
// figure out which hour bucket it belongs to
hour := int(now.Sub(entry.Time).Hours())
if hour >= 24 {
@ -252,6 +252,7 @@ func fillStatsFromQueryLog() error {
return nil
}
// HandleStatsTop returns the current top stats
func HandleStatsTop(w http.ResponseWriter, r *http.Request) {
domains := map[string]int{}
blocked := map[string]int{}
@ -320,9 +321,9 @@ func HandleStatsTop(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
_, err := w.Write(json.Bytes())
if err != nil {
errortext := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusInternalServerError)
errorText := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusInternalServerError)
}
}

48
dnsforward/stats.go
View file

@ -17,7 +17,6 @@ var (
filteredLists = newDNSCounter("filtered_lists_total")
filteredSafebrowsing = newDNSCounter("filtered_safebrowsing_total")
filteredParental = newDNSCounter("filtered_parental_total")
filteredInvalid = newDNSCounter("filtered_invalid_total")
whitelisted = newDNSCounter("whitelisted_total")
safesearch = newDNSCounter("safesearch_total")
errorsTotal = newDNSCounter("errors_total")
@ -93,7 +92,7 @@ func (p *periodicStats) Observe(name string, when time.Time, value float64) {
currentValues := p.Entries[countname]
value := currentValues[elapsed]
// log.Tracef("Will change p.Entries[%s][%d] from %v to %v", countname, elapsed, value, value+1)
value += 1
value++
currentValues[elapsed] = value
p.Entries[countname] = currentValues
}
@ -224,6 +223,7 @@ func incrementCounters(entry *logEntry) {
elapsedTime.ObserveWithTime(entry.Elapsed.Seconds(), entry.Time)
}
// HandleStats returns aggregated stats data for the 24 hours
func HandleStats(w http.ResponseWriter, r *http.Request) {
const numHours = 24
histrical := generateMapFromStats(&statistics.PerHour, 0, numHours)
@ -252,17 +252,17 @@ func HandleStats(w http.ResponseWriter, r *http.Request) {
json, err := json.Marshal(summed)
if err != nil {
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(json)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
return
}
}
@ -296,6 +296,7 @@ func generateMapFromStats(stats *periodicStats, start int, end int) map[string]i
return result
}
// HandleStatsHistory returns historical stats data for the 24 hours
func HandleStatsHistory(w http.ResponseWriter, r *http.Request) {
// handle time unit and prepare our time window size
now := time.Now()
@ -323,16 +324,16 @@ func HandleStatsHistory(w http.ResponseWriter, r *http.Request) {
// parse start and end time
startTime, err := time.Parse(time.RFC3339, r.URL.Query().Get("start_time"))
if err != nil {
errortext := fmt.Sprintf("Must specify valid start_time parameter: %s", err)
log.Println(errortext)
http.Error(w, errortext, 400)
errorText := fmt.Sprintf("Must specify valid start_time parameter: %s", err)
log.Println(errorText)
http.Error(w, errorText, 400)
return
}
endTime, err := time.Parse(time.RFC3339, r.URL.Query().Get("end_time"))
if err != nil {
errortext := fmt.Sprintf("Must specify valid end_time parameter: %s", err)
log.Println(errortext)
http.Error(w, errortext, 400)
errorText := fmt.Sprintf("Must specify valid end_time parameter: %s", err)
log.Println(errorText)
http.Error(w, errorText, 400)
return
}
@ -360,28 +361,29 @@ func HandleStatsHistory(w http.ResponseWriter, r *http.Request) {
data := generateMapFromStats(stats, start, end)
json, err := json.Marshal(data)
if err != nil {
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to marshal status json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(json)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
errorText := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errorText)
http.Error(w, errorText, 500)
return
}
}
// HandleStatsReset resets the stats caches
func HandleStatsReset(w http.ResponseWriter, r *http.Request) {
purgeStats()
_, err := fmt.Fprintf(w, "OK\n")
if err != nil {
errortext := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusInternalServerError)
errorText := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusInternalServerError)
}
}

14
filter.go
View file

@ -70,20 +70,20 @@ func updateUniqueFilterID(filters []filter) {
func assignUniqueFilterID() int64 {
value := nextFilterID
nextFilterID += 1
nextFilterID++
return value
}
// Sets up a timer that will be checking for filters updates periodically
func periodicallyRefreshFilters() {
for range time.Tick(time.Minute) {
refreshFiltersIfNeccessary(false)
refreshFiltersIfNecessary(false)
}
}
// Checks filters updates if necessary
// If force is true, it ignores the filter.LastUpdated field value
func refreshFiltersIfNeccessary(force bool) int {
func refreshFiltersIfNecessary(force bool) int {
config.Lock()
// fetch URLs
@ -113,8 +113,12 @@ func refreshFiltersIfNeccessary(force bool) int {
}
config.Unlock()
if updateCount > 0 {
reconfigureDNSServer()
if updateCount > 0 && isRunning() {
err := reconfigureDNSServer()
if err != nil {
msg := fmt.Sprintf("SHOULD NOT HAPPEN: cannot reconfigure DNS server with the new filters: %s", err)
panic(msg)
}
}
return updateCount
}

6
i18n.go
View file

@ -34,9 +34,9 @@ func handleI18nCurrentLanguage(w http.ResponseWriter, r *http.Request) {
log.Printf("config.Language is %s", config.Language)
_, err := fmt.Fprintf(w, "%s\n", config.Language)
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusInternalServerError)
errorText := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errorText)
http.Error(w, errorText, http.StatusInternalServerError)
return
}
}