blallo 2020-10-12 00:50:07 +02:00
commit f990e92a9d
Assinado por: blallo
ID da chave GPG: 0CBE577C9B72DC3F
11 arquivos alterados com 279 adições e 0 exclusões

29
Makefile 100644
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output/arm64/probe:
cd probe \
&& GOOS=linux GOARCH=arm64 go build -tags netgo -o ../output/arm64/probe
output/amd64/probe:
cd probe \
&& GOOS=linux GOARCH=amd64 go build -tags netgo -o ../output/amd64/probe
output/arm64/probe-server:
cd probe-server \
&& GOOS=linux GOARCH=arm64 go build -tags netgo -o ../output/arm64/probe-server
output/amd64/probe-server:
cd probe-server \
&& GOOS=linux GOARCH=amd64 go build -tags netgo -o ../output/amd64/probe-server
build-arm64: output/arm64/probe output/arm64/probe-server
build-amd64: output/amd64/probe output/amd64/probe-server
build-all: build-arm64 build-amd64
clean-arm64:
rm -f output/arm64/probe*
clean-amd64:
rm -f output/amd64/probe*
clean-all: clean-arm64 clean-amd64

4
go.mod 100644
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module git.abbiamoundominio.org/blallo/go-prober
go 1.15

12
go.sum 100644
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github.com/mozilla/mig v0.0.0-20190913234010-9e7e4f525805 h1:aR0FDMk+x7dz50dqbvd5EPobe2cCHvRbUKGD6HhSXhk=
github.com/mozilla/mig v0.0.0-20190913234010-9e7e4f525805/go.mod h1:2c03209qVdj62h4aUMg8KfnbIGC83caKZB8/4F/7YV4=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20201002170205-7f63de1d35b0 h1:hb9wdF1z5waM+dSIICn1l0DkLVDT3hqhhQsDNUmHPRE=
golang.org/x/crypto v0.0.0-20201002170205-7f63de1d35b0/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3 h1:0GoQqolDA55aaLxZyTzK/Y2ePZzZTUrRacwib7cNsYQ=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634 h1:bNEHhJCnrwMKNMmOx3yAynp5vs5/gRy+XWFtZFu7NBM=
golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

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output/amd64/probe 100755

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output/arm64/probe 100755

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package main
import (
"bufio"
"errors"
"flag"
"log"
"net"
"strconv"
"strings"
"time"
)
var PortOutOfRange = errors.New("Port out of allowed range 1-65535")
var isDebug bool
func init() {
isDebug = false
}
func debug(v ...interface{}) {
if isDebug {
msg := make([]interface{}, len(v)+1)
msg[0] = "[DEBUG]"
for i, el := range v {
msg[i+1] = el
}
log.Println(msg...)
}
}
func handleConn(c net.Conn) {
defer c.Close()
debug("connection established:", c)
reader := bufio.NewReader(c)
for {
data, err := reader.ReadString('\n')
debug("Data =>", data)
if err != nil {
log.Fatal(err)
}
cleanData := strings.TrimSpace(string(data))
duration, err := time.ParseDuration(cleanData)
if err != nil {
log.Fatal(err)
}
debug("Duration =>", duration)
c.Write([]byte("ACK\n"))
time.Sleep(duration)
}
log.Println("connection closed:", c)
}
func parsePort(port int) (string, error) {
if port < 1 || port > 65535 {
return "", PortOutOfRange
}
return strconv.Itoa(port), nil
}
func main() {
var address string
var port int
flag.StringVar(&address, "addr", "", "The target address or ip")
flag.IntVar(&port, "port", 0, "The target port")
flag.BoolVar(&isDebug, "debug", false, "Enable debug logging")
flag.Parse()
parsedPort, err := parsePort(port)
if err != nil {
log.Fatal(err)
}
host := net.JoinHostPort(address, parsedPort)
server, err := net.Listen("tcp4", host)
if err != nil {
log.Fatal(err)
}
defer server.Close()
for {
c, err := server.Accept()
if err != nil {
log.Fatal(err)
}
go handleConn(c)
}
}

130
probe/main.go 100644
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package main
import (
"bufio"
"errors"
"flag"
"fmt"
"io"
"log"
"net"
"os"
"strconv"
"time"
)
var PortNotInRange = errors.New("the port number is not in the 0-65535 range")
var ServiceNotFound = errors.New("the service is not known")
var isDebug bool
func init() {
isDebug = false
}
func debug(v ...interface{}) {
if isDebug {
msg := make([]interface{}, len(v)+1)
msg[0] = "[DEBUG]"
for i, el := range v {
msg[i+1] = el
}
log.Println(msg...)
}
}
func connect(addr, port string) net.Conn {
target := net.JoinHostPort(addr, port)
conn, err := net.Dial("tcp", target)
if err != nil {
log.Fatal(err)
}
zero := time.Time{}
if err = conn.SetDeadline(zero); err != nil {
log.Fatal(err)
}
return conn
}
func validatePort(port int) error {
if port < 1 || port > 65535 {
return PortNotInRange
}
return nil
}
func getPort(srv string, port int) (string, error) {
if port != 0 {
return strconv.Itoa(port), nil
}
return srv, nil
}
func initLogger(logFile string) (*os.File, error) {
f, err := os.OpenFile(logFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
return nil, err
}
wrt := io.MultiWriter(os.Stdout, f)
log.SetOutput(wrt)
return f, nil
}
// TODO: planned function that should do some ping measurement and return
// the highest value found.
func findLatency(address string) (time.Duration, error) {
return time.Second, nil
}
func main() {
var address, srv, logFile string
var port int
var interval, latency, zero time.Duration
flag.StringVar(&address, "addr", "", "The target address or ip")
flag.IntVar(&port, "port", 0, "The target port")
flag.StringVar(&srv, "srv", "", "The target service (will be translated to default port, if -port not provided)")
flag.StringVar(&logFile, "log-file", "", "The file path to log to")
flag.DurationVar(&interval, "interval", time.Second, "Internal refresh duration (defaults to 1s)")
flag.DurationVar(&latency, "latency", zero, "Internal refresh duration (defaults to 1s)")
flag.BoolVar(&isDebug, "debug", false, "Enable debug logging")
flag.Parse()
if port != 0 {
validatePort(port)
}
if logFile == "" {
log.Println("Logging only to stdout")
} else if f, err := initLogger(logFile); err != nil {
log.Fatalf("error opening file: %v", err)
f.Close()
} else {
defer f.Close()
}
parsedPort, err := getPort(srv, port)
if err != nil {
log.Fatal(err)
}
if latency == zero {
latency, err = findLatency(address)
if err != nil {
log.Fatal(err)
}
}
log.Printf("Logging every %v\n", interval)
log.Printf("Latency is %v\n", latency)
conn := connect(address, parsedPort)
intervalStr := fmt.Sprintf("%v\n", interval)
for conn != nil {
conn.Write([]byte(intervalStr))
conn.SetReadDeadline(time.Now().Add(latency))
if data, err := bufio.NewReader(conn).ReadString('\n'); err != nil {
log.Print(err)
conn.Close()
conn = nil
} else {
debug("Data =>", data)
conn.SetReadDeadline(time.Now().Add(interval + latency))
}
time.Sleep(interval)
}
log.Println("Connection closed")
}

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[Unit]
Description=Probe server to allow testing of long-lived connections
[Service]
Type=simple
ExecStart=/usr/local/bin/probe-server -port ${PROBE_PORT}
Restart=always

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[Unit]
Description=Probe network for disconnections on long-lived connections
[Service]
Type=simple
ExecStart=/usr/local/bin/probe -addr ${PROBE_HOST} -port ${PROBE_PORT} -log-file /var/log/probe/probe.log
Restart=always
RestartSec=60