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url.go
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url.go
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package main
import (
"fmt"
"log"
"net"
"net/http"
"net/url"
"strings"
"github.com/go-resty/resty/v2"
"github.com/pkg/errors"
)
const (
ActionAuth = "AUTH"
ActionBlock = "**BLOCK**"
ActionBlocked = "BLOCKED-EEC"
)
var (
ErrHttpsSkip = errors.New("skipping https")
ErrParseError = errors.New("error parsing URL")
)
func checkForIP(str string) net.IP {
if str == "" {
return net.IP{}
}
l := len(str)
if str[0] == '[' {
if str[l-1] == ']' {
return net.ParseIP(str[1 : l-1])
}
}
return net.ParseIP(str)
}
func sanitize(str string) (out string, err error) {
// We do not try to see if there is an error because of some corner cases
myurl, err := url.Parse(str)
if err != nil {
str = "http://" + str
myurl, err = url.Parse(str)
}
if myurl == nil {
debug("str=%s myurl is null", str)
return "", ErrParseError
}
// We do not test https
if myurl.Scheme == "https" {
return str, ErrHttpsSkip
}
// If a special scheme, transform it into http for convenience
if myurl.Scheme != "http" {
myurl.Scheme = "http"
}
// If host is empty, we might have IP or [IP] or bare hostname
if myurl.Host == "" {
//
if ip := checkForIP(myurl.Path); ip != nil {
myurl.Host = ip.String()
myurl.Path = ""
} else {
// Path is actually Host/Path
u, _ := url.Parse(myurl.Path)
myurl.Host = u.Host
myurl.Path = u.Path
}
return myurl.String(), nil
}
// Onion sites are not reachable except within Tor
if strings.Contains(myurl.Host, ".onion") {
return str, ErrHttpsSkip
}
// check for [IP]
l := len(myurl.Host)
if myurl.Host[0] == '[' && myurl.Host[l-1] == ']' {
myurl.Host = myurl.Host[1 : l-1]
}
return myurl.String(), err
}
func handleURL(c *resty.Client, str string) (string, error) {
//debug("before,url=%s", str)
if fNoURLs {
return "", nil
}
// https URLs will not be blocked, no MITM
myurl, err := sanitize(str)
if err == ErrHttpsSkip {
return "", err
}
debug("url=%s", myurl)
resp, err := c.R().
SetHeader("User-Agent", fmt.Sprintf("%s/%s", MyName, MyVersion)).
Head(myurl)
if err != nil {
return "", errors.Wrap(err, "Head")
}
switch resp.StatusCode() {
// Error (blocked port etc.)
case http.StatusServiceUnavailable:
fallthrough
// Already blocked
case http.StatusForbidden:
return ActionBlocked, nil
// Missing a parameter
case http.StatusProxyAuthRequired:
log.Printf("Auth required")
return ActionAuth, err
// Block it already!
default:
return str, nil
}
}