1 files changed, 61 insertions, 0 deletions
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..c43fb0b
--- /dev/null
+++ b/main.go
@@ -0,0 +1,61 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"regexp"
+
+	"snix.ir/nanontp/engine"
+	"snix.ir/nanontp/getter"
+	"snix.ir/nanontp/network"
+)
+
+const regIPPORT string = "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]):()([1-9]|[1-5]?[0-9]{2,4}|6[1-4][0-9]{3}|65[1-4][0-9]{2}|655[1-2][0-9]|6553[1-5])$"
+const regDomainIPport string = "^(((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)|((\\*\\.)?([a-zA-Z0-9-]+\\.){0,5}[a-zA-Z0-9-][a-zA-Z0-9-]+\\.[a-zA-Z]{2,63}?)):([1-9]|[1-5]?[0-9]{2,4}|6[1-4][0-9]{3}|65[1-4][0-9]{2}|655[1-2][0-9]|6553[1-5])$"
+
+func main() {
+	flag.Usage = usage
+	ipup := flag.String("net", "0.0.0.0:123", "udp network to listen on <ipv4:port>")
+	flag.Parse()
+	if match, _ := regexp.MatchString(regIPPORT, *ipup); !match {
+		fmt.Printf("fatal: %v is not a valid <ipv4:port> address\n", *ipup)
+		flag.Usage()
+		os.Exit(2)
+	}
+	getter.ArgNTP = flag.Args()
+
+	if len(getter.ArgNTP) == 0 {
+		fmt.Println("fatal: you must give me a upstream ntp server <ipv4-or-domain:port>")
+		flag.Usage()
+		os.Exit(2)
+
+	}
+	for _, x := range getter.ArgNTP {
+		if match, _ := regexp.MatchString(regDomainIPport, x); !match {
+			fmt.Printf("fatal: %v is not a valid ntp upstream address\n", x)
+			flag.Usage()
+			os.Exit(2)
+		}
+	}
+
+	var handler = network.GetHandler()
+	engine.Reactor.ListenUdp(*ipup, handler)
+	engine.Reactor.Run()
+}
+
+func usage() {
+	fmt.Printf(`usage of snix ntp server:
+%v -net [ipv4:port] ntp-domain.com:port ntp-domain.org:port ...
+
+options:
+  --net string     udp network to listen on <ipv4:port> (default "0.0.0.0:123")
+  --h              print this banner and exit
+example: 
+  %v --net 0.0.0.0:123 time.google.com:123 ntp.day.ir:123 10.10.10.10:123 
+
+Copyright (c) 2020 slc.snix.ir, All rights reserved.
+Developed BY a.esmaeilpour@irisaco.com And s.ghaderi1999@gmail.com
+This work is licensed under the terms of the MIT license.
+`, os.Args[0], os.Args[0])
+}