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protogen.go
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protogen.go
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package main
import (
"fmt"
"os"
"os/signal"
"protogen/protodir"
"protogen/protomath"
"protogen/protoquote"
"protogen/prototype"
"regexp"
"strconv"
"syscall"
)
type programFunction int
const (
PROTOQUOTE programFunction = 0
PROTODIR programFunction = 1
PROTOMATH programFunction = 2
NONE programFunction = -1
)
var (
regexHostIpV4 *regexp.Regexp
regexHostIpV6 *regexp.Regexp
regexHostDOmain *regexp.Regexp
regexUnixFilePath *regexp.Regexp
)
func init() {
regexHostIpV4 = regexp.MustCompile(`^(((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.|:|$)){4}\d{2,5})`)
regexHostIpV6 = regexp.MustCompile(`^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$`)
regexHostDOmain = regexp.MustCompile(`^(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)+[a-z0-9][a-z0-9-]{0,61}[a-z0-9]$`)
regexUnixFilePath = regexp.MustCompile(`[^\0]+`)
}
func main() {
firstArg := os.Args[1]
restArgs := prototype.StrSlice(os.Args[2:])
progFunc, protoName, cleanerUpper := getProgFunc(firstArg)
go progFunc.executeSuitable(restArgs)
pollForExit(protoName, cleanerUpper)
}
func pollForExit(proto string, cleanerUpper func()) {
fmt.Printf("Starting ProtoGen on %s\n", proto)
c := make(chan os.Signal, 1)
finish := make(chan int)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
go func() {
<-c
cleanerUpper()
}()
<-finish
}
func getProgFunc(firstArg string) (programFunction, string, func()) {
switch firstArg {
case "quote", "protoquote":
return PROTOQUOTE, "ProtoQuote", protoquote.CleanUpProtoQuote
case "dir", "protodir":
return PROTODIR, "ProtoDir", protodir.CleanUpProtoDir
case "math", "protomath":
return PROTOMATH, "ProtoMath", protomath.CleanUpProtoMath
default:
break
}
return NONE, "None", nil
}
func (prg programFunction) executeSuitable(argsSlice prototype.StrSlice) {
switch prg {
case PROTOQUOTE:
checkArgsSliceLen(argsSlice, 2, 4)
address := checkHostAddr(getArgOut(argsSlice, "-a", "--addr", true))
interval := parseAndCheckInterval(getArgOut(argsSlice, "-i", "--interval", false))
protoquote.ProtoQuoteMain(address, interval)
case PROTODIR:
checkArgsSliceLen(argsSlice, 2, 6)
path := checkUnixPath(getArgOut(argsSlice, "-p", "--path", true))
ttl := parseAndCheckTtl(getArgOut(argsSlice, "-t", "--ttl", false))
clearInterval := parseAndCheckClearInterval(getArgOut(argsSlice, "-c", "--clear_interval", false))
protodir.ProtoDirMain(path, ttl, clearInterval)
case PROTOMATH:
checkArgsSliceLen(argsSlice, 2, 2)
address := checkHostAddr(getArgOut(argsSlice, "-a", "--addr", true))
protomath.ProtoMathMain(address)
case NONE:
errorOutStr("No valid subsystem given as first argument")
}
}
func parseAndCheckInterval(arg string) int {
integer, err := strconv.ParseUint(arg, 10, 8)
if err != nil {
fmt.Println("Wrong or no argument for interval, setting to 5")
return 5
}
if integer < 5 || integer > 50 {
errorOutStr("Interval must be between 5 and 50")
}
return int(integer)
}
func parseAndCheckClearInterval(arg string) int {
integer, err := strconv.ParseUint(arg, 10, 8)
if err != nil {
fmt.Println("Wrong or no argument for clear interval, setting to 45")
return 45
}
if integer < 10 || integer > 300 {
errorOutStr("Clear interval must be between 10 and 300")
}
return int(integer)
}
func parseAndCheckTtl(arg string) int {
integer, err := strconv.ParseUint(arg, 10, 8)
if err != nil {
fmt.Println("Wrong or no argument for TTL, setting to 10")
return 10
}
if integer < 10 || integer > 30 {
errorOutStr("TTL must be between 10 and 30")
}
return int(integer)
}
func checkArgsSliceLen(argsSlice prototype.StrSlice, minMustBeLen, maxMustBeLen int) {
if !(len(argsSlice) >= minMustBeLen && len(argsSlice) <= maxMustBeLen) {
errorOutStr(fmt.Sprintf("Wrong number of arguments (plus flags!) given after the subcommand, must be between %d and %d", minMustBeLen, maxMustBeLen))
}
}
func checkHostAddr(addr string) string {
if regexHostIpV4.MatchString(addr) || regexHostIpV6.MatchString(addr) || regexHostDOmain.MatchString(addr) {
return addr
}
errorOutStr("Address must be valid IPV4, IPV6 and Domain Name")
return ""
}
func checkUnixPath(path string) string {
if regexUnixFilePath.MatchString(path) {
return path
}
errorOutStr("Wrong path for UNIX given")
return ""
}
func getArgOut(argsSlice prototype.StrSlice, seekingShort, seekingLong string, required bool) string {
argValue := ""
for before, after := range argsSlice.ZipIt() {
switch before {
case seekingShort, seekingLong:
argValue = after
if after == prototype.NULLSTR {
errorOutStr("You must pass an argument to the address flag")
}
}
}
if required && argValue == "" {
errorOutStr(fmt.Sprintf("Argument %s is required", seekingLong))
}
return argValue
}
func errorOutStr(err string) {
fmt.Printf("\033[1;31mError occured:\033[0m %s\n", err)
os.Exit(1)
}