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# ssl-multicast-sources | ||
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Detect IPs of multicast message producers for debugging purposes. | ||
By default, it looks for all multicast groups and ports that are used by default in the SSL. | ||
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## Usage | ||
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The binary is called `ssl-multicast-sources`. | ||
Pass custom multicast IPs/ports like this: | ||
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```shell | ||
ssl-multicast-sources 224.5.23.1:10003 224.5.23.2:10006 | ||
``` |
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package main | ||
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import ( | ||
"flag" | ||
"log" | ||
"net" | ||
"time" | ||
) | ||
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const maxDatagramSize = 8192 | ||
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var detectedRemotes map[string][]string | ||
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func main() { | ||
flag.Parse() | ||
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detectedRemotes = map[string][]string{} | ||
mcAddresses := flag.Args() | ||
if len(mcAddresses) == 0 { | ||
mcAddresses = []string{"224.5.23.1:10003", "224.5.23.2:10006", "224.5.23.2:10010", "224.5.23.2:10012"} | ||
} | ||
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for _, address := range mcAddresses { | ||
go watchAddress(address) | ||
} | ||
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for { | ||
time.Sleep(1 * time.Second) | ||
} | ||
} | ||
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func watchAddress(address string) { | ||
addr, err := net.ResolveUDPAddr("udp", address) | ||
if err != nil { | ||
log.Fatal(err) | ||
} | ||
conn, err := net.ListenMulticastUDP("udp", nil, addr) | ||
if err != nil { | ||
log.Fatal(err) | ||
} | ||
if err := conn.SetReadBuffer(maxDatagramSize); err != nil { | ||
log.Printf("Could not set read buffer to %v.", maxDatagramSize) | ||
} | ||
log.Println("Receiving from", address) | ||
for { | ||
_, udpAddr, err := conn.ReadFromUDP([]byte{0}) | ||
if err != nil { | ||
log.Print("Could not read: ", err) | ||
time.Sleep(1 * time.Second) | ||
continue | ||
} | ||
addRemote(address, udpAddr.IP.String()) | ||
} | ||
} | ||
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func addRemote(address string, remote string) { | ||
remotes, ok := detectedRemotes[address] | ||
if !ok { | ||
detectedRemotes[address] = []string{} | ||
} | ||
for _, a := range remotes { | ||
if a == remote { | ||
return | ||
} | ||
} | ||
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detectedRemotes[address] = append(detectedRemotes[address], remote) | ||
log.Printf("remote ip on %v: %v\n", address, remote) | ||
} |