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|
package qna
import (
"crypto/tls"
"fmt"
"net"
"net/url"
"os"
"strings"
)
type Question struct {
Domain string // domain name to visit via HTTPS
}
type Answer struct {
Domain string // domain name of the visited HTTPS site
HTTP string // value set in the Onion-Location HTTP header (if any)
HTML string // value set in the Onion-Location HTML attribute (if any)
CtxErr bool // true if context deadline was exceeded
ReqErr error // nil if HTTP GET request could be constructed
DoErr error // nil if HTTP GET request could be executed
}
func (a Answer) String() string {
if a.CtxErr {
return fmt.Sprintf("%s: context deadline exteeded")
}
if a.ReqErr != nil {
return fmt.Sprintf("%s: %v", a.ReqErr)
}
if a.DoErr != nil {
return fmt.Sprintf("%s: %v", a.DoErr)
}
if a.HTTP == "" && a.HTML == "" {
return fmt.Sprintf("%s: connected but found no Onion-Location")
}
return fmt.Sprintf("%s header=%s attribute=%s", a.Domain, a.HTTP, a.HTML)
}
func (a *Answer) OnionLocation() bool {
return a.HTTP != "" || a.HTML != ""
}
type Progress struct {
NumOK int
NumOnion int
NumMakeReqErr int
NumDNSNotFoundErr int
NumDNSTimeoutErr int
NumDNSOtherErr int
NumConnTimeoutErr int
NumConnSyscallErr int
NumTLSCertErr int
NumTLSOtherErr int
Num3xxErr int
NumEOFErr int
NumDeadlineErr int
NumOtherErr int
}
func (p Progress) String() string {
str := fmt.Sprintf(" Processed: %d\n", p.NumProcess())
str += fmt.Sprintf(" Success: %d (Onion-Location:%d)\n", p.NumOK, p.NumOnion)
str += fmt.Sprintf(" Failure: %d (See breakdown below)\n", p.NumError())
str += fmt.Sprintf(" Req: %d (Before sending request)\n", p.NumMakeReqErr)
str += fmt.Sprintf(" DNS: %d (NotFound:%d Timeout:%d Other:%d)\n",
p.NumDNSErr(), p.NumDNSNotFoundErr, p.NumDNSTimeoutErr, p.NumDNSOtherErr)
str += fmt.Sprintf(" TCP: %d (Timeout:%d Syscall:%d)\n",
p.NumConnErr(), p.NumConnTimeoutErr, p.NumConnSyscallErr)
str += fmt.Sprintf(" TLS: %d (Cert:%d Other:%d)\n", p.NumTLSErr(), p.NumTLSCertErr, p.NumTLSOtherErr)
str += fmt.Sprintf(" 3xx: %d (Too many redirects)\n", p.Num3xxErr)
str += fmt.Sprintf(" EOF: %d (Unclear meaning)\n", p.NumEOFErr)
str += fmt.Sprintf(" CTX: %d (Deadline exceeded)\n", p.NumDeadlineErr)
str += fmt.Sprintf(" ???: %d (Other errors)", p.NumOtherErr)
return str
}
func (p *Progress) NumDNSErr() int {
return p.NumDNSNotFoundErr + p.NumDNSTimeoutErr + p.NumDNSOtherErr
}
func (p *Progress) NumConnErr() int {
return p.NumConnTimeoutErr + p.NumConnSyscallErr
}
func (p *Progress) NumTLSErr() int {
return p.NumTLSCertErr + p.NumTLSOtherErr
}
func (p *Progress) NumError() int {
return p.NumMakeReqErr + p.NumDNSErr() + p.NumConnErr() + p.NumTLSErr() + p.Num3xxErr + p.NumEOFErr + p.NumDeadlineErr + p.NumOtherErr
}
func (p *Progress) NumProcess() int {
return p.NumOK + p.NumError()
}
func (p *Progress) AddAnswer(a Answer) {
if a.CtxErr {
p.NumDeadlineErr++
return
}
if err := a.ReqErr; err != nil {
p.NumMakeReqErr++
return
}
if err := a.DoErr; err != nil {
if e := dnsError(err); e != nil {
if e.IsTimeout {
p.NumDNSTimeoutErr++
} else if e.IsNotFound {
p.NumDNSNotFoundErr++
} else {
p.NumDNSOtherErr++
}
} else if isConnTimeoutError(err) {
p.NumConnTimeoutErr++
} else if isConnSyscallError(err) {
p.NumConnSyscallErr++
} else if isTLSError(err) {
if isTLSCertError(err) {
p.NumTLSCertErr++
} else {
p.NumTLSOtherErr++
}
} else if is3xxErr(err) {
p.Num3xxErr++
} else if isEOFError(err) {
p.NumEOFErr++
} else {
p.NumOtherErr++
}
return
}
p.NumOK++
if a.OnionLocation() {
p.NumOnion++
}
}
func dnsError(err error) *net.DNSError {
urlErr, ok := err.(*url.Error)
if !ok {
return nil
}
opErr, ok := urlErr.Err.(*net.OpError)
if !ok {
return nil
}
dnsErr, ok := opErr.Err.(*net.DNSError)
if !ok {
return nil
}
return dnsErr
}
func isConnTimeoutError(err error) bool {
urlErr, ok := err.(*url.Error)
if !ok {
return false
}
opErr, ok := urlErr.Err.(*net.OpError)
return ok && opErr.Err.Error() == "i/o timeout"
}
func isConnSyscallError(err error) bool {
urlErr, ok := err.(*url.Error)
if !ok {
return false
}
opErr, ok := urlErr.Err.(*net.OpError)
if !ok {
return false
}
syscallErr, ok := opErr.Err.(*os.SyscallError)
return ok && (syscallErr.Syscall == "connect" || syscallErr.Syscall == "read")
}
func isTLSError(err error) bool {
urlErr, ok := err.(*url.Error)
if !ok {
return false
}
if urlErr.Err.Error() == "http: server gave HTTP response to HTTPS client" {
return true
}
return strings.Contains(urlErr.Err.Error(), "tls: ")
}
func isTLSCertError(err error) bool {
urlErr, ok := err.(*url.Error)
if !ok {
return false
}
_, ok = urlErr.Err.(*tls.CertificateVerificationError)
return ok
}
func is3xxErr(err error) bool {
urlErr, ok := err.(*url.Error)
return ok && urlErr.Err.Error() == "stopped after 10 redirects"
}
func isEOFError(err error) bool {
urlErr, ok := err.(*url.Error)
return ok && (urlErr.Err.Error() == "EOF" || urlErr.Err.Error() == "unexpected EOF")
}
func TrimWildcard(san string) string {
if len(san) >= 2 && san[:2] == "*." {
return san[2:]
}
return san
}
|
