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bootstrap DNS resolver feature

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This commit is contained in:
Vladislav Yarmak
2021-03-28 22:21:23 +03:00
parent f40eb15e29
commit d83b855259
4 changed files with 456 additions and 5 deletions
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main.go
+39 -5
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@@ -20,6 +20,11 @@ import (
se "github.com/Snawoot/opera-proxy/seclient"
)
const (
API_DOMAIN = "api.sec-tunnel.com"
PROXY_SUFFIX = "sec-tunnel.com"
)
var (
version = "undefined"
)
@@ -48,6 +53,7 @@ type CLIArgs struct {
apiLogin string
apiPassword string
apiAddress string
bootstrapDNS string
}
func parse_args() CLIArgs {
@@ -65,7 +71,11 @@ func parse_args() CLIArgs {
"Examples: http://user:password@192.168.1.1:3128, socks5://10.0.0.1:1080")
flag.StringVar(&args.apiLogin, "api-login", "se0316", "SurfEasy API login")
flag.StringVar(&args.apiPassword, "api-password", "SILrMEPBmJuhomxWkfm3JalqHX2Eheg1YhlEZiMh8II", "SurfEasy API password")
flag.StringVar(&args.apiAddress, "api-address", "", "override IP address of api.sec-tunnel.com")
flag.StringVar(&args.apiAddress, "api-address", "", fmt.Sprintf("override IP address of %s", API_DOMAIN))
flag.StringVar(&args.bootstrapDNS, "bootstrap-dns", "",
"DNS/DoH/DoT/DoQ resolver for initial discovering of SurfEasy API address. "+
"See https://github.com/ameshkov/dnslookup/ for upstream DNS URL format. "+
"Examples: https://1.1.1.1/dns-query, quic://dns.adguard.com")
flag.Parse()
if args.country == "" {
arg_fail("Country can't be empty string.")
@@ -73,6 +83,9 @@ func parse_args() CLIArgs {
if args.listCountries && args.listProxies {
arg_fail("list-countries and list-proxies flags are mutually exclusive")
}
if args.apiAddress != "" && args.bootstrapDNS != "" {
arg_fail("api-address and bootstrap-dns options are mutually exclusive")
}
return args
}
@@ -126,8 +139,29 @@ func run() int {
}
seclientDialer := dialer
if args.apiAddress != "" {
seclientDialer = NewFixedDialer(args.apiAddress, dialer)
if args.apiAddress != "" || args.bootstrapDNS != "" {
var apiAddress string
if args.apiAddress != "" {
apiAddress = args.apiAddress
mainLogger.Info("Using fixed API host IP address = %s", apiAddress)
} else {
resolver, err := NewResolver(args.bootstrapDNS, args.timeout)
if err != nil {
mainLogger.Critical("Unable to instantiate DNS resolver: %v", err)
return 4
}
mainLogger.Info("Discovering API IP address...")
addrs := resolver.ResolveA(API_DOMAIN)
if len(addrs) == 0 {
mainLogger.Critical("Unable to resolve %s with specified bootstrap DNS", API_DOMAIN)
return 14
}
apiAddress = addrs[0]
mainLogger.Info("Discovered address of API host = %s", apiAddress)
}
seclientDialer = NewFixedDialer(apiAddress, dialer)
}
// Dialing w/o SNI, receiving self-signed certificate, so skip verification.
@@ -199,7 +233,7 @@ func run() int {
return authHdr
}
handlerDialer := NewProxyDialer(endpoint.NetAddr(), fmt.Sprintf("%s0.sec-tunnel.com", args.country), auth, dialer)
handlerDialer := NewProxyDialer(endpoint.NetAddr(), fmt.Sprintf("%s0.%s", args.country, PROXY_SUFFIX), auth, dialer)
mainLogger.Info("Endpoint: %s", endpoint.NetAddr())
mainLogger.Info("Starting proxy server...")
handler := NewProxyHandler(handlerDialer, proxyLogger)
@@ -240,7 +274,7 @@ func printProxies(ips []se.SEIPEntry, seclient *se.SEClient) int {
for i, ip := range ips {
for _, port := range ip.Ports {
wr.Write([]string{
fmt.Sprintf("%s%d.sec-tunnel.com", strings.ToLower(ip.Geo.CountryCode), i),
fmt.Sprintf("%s%d.%s", strings.ToLower(ip.Geo.CountryCode), i, PROXY_SUFFIX),
ip.IP,
fmt.Sprintf("%d", port),
})