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conn.go
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conn.go
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package rawhttp
import (
"crypto/tls"
"fmt"
"io"
"net"
"net/url"
"strings"
"sync"
"time"
"github.com/projectdiscovery/rawhttp/client"
"github.com/projectdiscovery/rawhttp/proxy"
)
// Dialer can dial a remote HTTP server.
type Dialer interface {
// Dial dials a remote http server returning a Conn.
Dial(protocol, addr string, options *Options) (Conn, error)
DialWithProxy(protocol, addr, proxyURL string, timeout time.Duration, options *Options) (Conn, error)
// Dial dials a remote http server with timeout returning a Conn.
DialTimeout(protocol, addr string, timeout time.Duration, options *Options) (Conn, error)
}
type dialer struct {
sync.Mutex // protects following fields
conns map[string][]Conn // maps addr to a, possibly empty, slice of existing Conns
}
func (d *dialer) Dial(protocol, addr string, options *Options) (Conn, error) {
return d.dialTimeout(protocol, addr, 0, options)
}
func (d *dialer) DialTimeout(protocol, addr string, timeout time.Duration, options *Options) (Conn, error) {
return d.dialTimeout(protocol, addr, timeout, options)
}
func (d *dialer) dialTimeout(protocol, addr string, timeout time.Duration, options *Options) (Conn, error) {
d.Lock()
if d.conns == nil {
d.conns = make(map[string][]Conn)
}
if c, ok := d.conns[addr]; ok {
if len(c) > 0 {
conn := c[0]
c[0] = c[len(c)-1]
d.Unlock()
return conn, nil
}
}
d.Unlock()
c, err := clientDial(protocol, addr, timeout, options)
return &conn{
Client: client.NewClient(c),
Conn: c,
dialer: d,
}, err
}
func (d *dialer) DialWithProxy(protocol, addr, proxyURL string, timeout time.Duration, options *Options) (Conn, error) {
var c net.Conn
u, err := url.Parse(proxyURL)
if err != nil {
return nil, fmt.Errorf("unsupported proxy error: %w", err)
}
switch u.Scheme {
case "http":
c, err = proxy.HTTPDialer(proxyURL, timeout)(addr)
case "socks5", "socks5h":
c, err = proxy.Socks5Dialer(proxyURL, timeout)(addr)
default:
return nil, fmt.Errorf("unsupported proxy protocol: %s", proxyURL)
}
if err != nil {
return nil, fmt.Errorf("proxy error: %w", err)
}
if protocol == "https" {
if c, err = TlsHandshake(c, addr); err != nil {
return nil, fmt.Errorf("tls handshake error: %w", err)
}
}
return &conn{
Client: client.NewClient(c),
Conn: c,
dialer: d,
}, err
}
func clientDial(protocol, addr string, timeout time.Duration, options *Options) (net.Conn, error) {
// http
if protocol == "http" {
if timeout > 0 {
return net.DialTimeout("tcp", addr, timeout)
}
return net.Dial("tcp", addr)
}
// https
tlsConfig := &tls.Config{InsecureSkipVerify: true}
if options.SNI != "" {
tlsConfig.ServerName = options.SNI
}
if timeout > 0 {
conn, err := net.DialTimeout("tcp", addr, timeout)
if err != nil {
return nil, err
}
tlsConn := tls.Client(conn, tlsConfig)
return tlsConn, tlsConn.Handshake()
}
return tls.Dial("tcp", addr, tlsConfig)
}
// TlsHandshake tls handshake on a plain connection
func TlsHandshake(conn net.Conn, addr string) (net.Conn, error) {
colonPos := strings.LastIndex(addr, ":")
if colonPos == -1 {
colonPos = len(addr)
}
hostname := addr[:colonPos]
tlsConn := tls.Client(conn, &tls.Config{
InsecureSkipVerify: true,
ServerName: hostname,
})
if err := tlsConn.Handshake(); err != nil {
conn.Close()
return nil, err
}
return tlsConn, nil
}
// Conn is an interface implemented by a connection
type Conn interface {
client.Client
io.Closer
SetDeadline(time.Time) error
SetReadDeadline(time.Time) error
SetWriteDeadline(time.Time) error
Release()
}
type conn struct {
client.Client
net.Conn
*dialer
}
func (c *conn) Release() {
c.dialer.Lock()
defer c.dialer.Unlock()
addr := c.Conn.RemoteAddr().String()
c.dialer.conns[addr] = append(c.dialer.conns[addr], c)
}