2024-11-15 00:50:31 +00:00
|
|
|
package loadbalancer
|
|
|
|
|
|
|
|
import (
|
|
|
|
"fmt"
|
|
|
|
"net"
|
|
|
|
"net/url"
|
|
|
|
"os"
|
|
|
|
"strconv"
|
|
|
|
"time"
|
|
|
|
|
|
|
|
"github.com/k3s-io/k3s/pkg/version"
|
|
|
|
http_dialer "github.com/mwitkow/go-http-dialer"
|
|
|
|
"github.com/pkg/errors"
|
|
|
|
"github.com/sirupsen/logrus"
|
|
|
|
"golang.org/x/net/http/httpproxy"
|
|
|
|
"golang.org/x/net/proxy"
|
|
|
|
)
|
|
|
|
|
|
|
|
var defaultDialer proxy.Dialer = &net.Dialer{
|
|
|
|
Timeout: 10 * time.Second,
|
|
|
|
KeepAlive: 30 * time.Second,
|
|
|
|
}
|
|
|
|
|
|
|
|
// SetHTTPProxy configures a proxy-enabled dialer to be used for all loadbalancer connections,
|
|
|
|
// if the agent has been configured to allow use of a HTTP proxy, and the environment has been configured
|
|
|
|
// to indicate use of a HTTP proxy for the server URL.
|
|
|
|
func SetHTTPProxy(address string) error {
|
|
|
|
// Check if env variable for proxy is set
|
|
|
|
if useProxy, _ := strconv.ParseBool(os.Getenv(version.ProgramUpper + "_AGENT_HTTP_PROXY_ALLOWED")); !useProxy || address == "" {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
serverURL, err := url.Parse(address)
|
|
|
|
if err != nil {
|
|
|
|
return errors.Wrapf(err, "failed to parse address %s", address)
|
|
|
|
}
|
|
|
|
|
|
|
|
// Call this directly instead of using the cached environment used by http.ProxyFromEnvironment to allow for testing
|
|
|
|
proxyFromEnvironment := httpproxy.FromEnvironment().ProxyFunc()
|
|
|
|
proxyURL, err := proxyFromEnvironment(serverURL)
|
|
|
|
if err != nil {
|
|
|
|
return errors.Wrapf(err, "failed to get proxy for address %s", address)
|
|
|
|
}
|
|
|
|
if proxyURL == nil {
|
|
|
|
logrus.Debug(version.ProgramUpper + "_AGENT_HTTP_PROXY_ALLOWED is true but no proxy is configured for URL " + serverURL.String())
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
dialer, err := proxyDialer(proxyURL, defaultDialer)
|
|
|
|
if err != nil {
|
|
|
|
return errors.Wrapf(err, "failed to create proxy dialer for %s", proxyURL)
|
|
|
|
}
|
|
|
|
|
|
|
|
defaultDialer = dialer
|
|
|
|
logrus.Debugf("Using proxy %s for agent connection to %s", proxyURL, serverURL)
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// proxyDialer creates a new proxy.Dialer that routes connections through the specified proxy.
|
|
|
|
func proxyDialer(proxyURL *url.URL, forward proxy.Dialer) (proxy.Dialer, error) {
|
|
|
|
if proxyURL.Scheme == "http" || proxyURL.Scheme == "https" {
|
|
|
|
// Create a new HTTP proxy dialer
|
2024-11-15 22:11:47 +00:00
|
|
|
httpProxyDialer := http_dialer.New(proxyURL, http_dialer.WithConnectionTimeout(10*time.Second), http_dialer.WithDialer(forward.(*net.Dialer)))
|
2024-11-15 00:50:31 +00:00
|
|
|
return httpProxyDialer, nil
|
|
|
|
} else if proxyURL.Scheme == "socks5" {
|
|
|
|
// For SOCKS5 proxies, use the proxy package's FromURL
|
|
|
|
return proxy.FromURL(proxyURL, forward)
|
|
|
|
}
|
|
|
|
return nil, fmt.Errorf("unsupported proxy scheme: %s", proxyURL.Scheme)
|
|
|
|
}
|