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|
package proxy
import (
"bytes"
"context"
"fmt"
"io"
"net"
"net/http"
"sync"
"time"
"github.com/shiv/internal/cert"
"github.com/shiv/internal/events"
internalhttp "github.com/shiv/internal/http"
"github.com/shiv/internal/logger"
)
type Proxy struct {
addr string
certAuth *cert.CA
bus *events.Bus
client *http.Client
mu sync.Mutex
srv *http.Server
conns sync.Map // active hijacked net.Conn
}
const maxBodySize = 10 << 20
func New(addr string, bus *events.Bus) (*Proxy, error) {
ca, err := cert.Load()
if err != nil {
return nil, fmt.Errorf("proxy: load CA: %w", err)
}
p := &Proxy{
addr: addr,
certAuth: ca,
bus: bus,
client: &http.Client{
Transport: &http.Transport{
ResponseHeaderTimeout: 30 * time.Second,
},
CheckRedirect: func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
},
},
}
bus.Register(p)
return p, nil
}
func (p *Proxy) CA() *cert.CA {
return p.certAuth
}
func (p *Proxy) trackConn(c net.Conn) {
p.conns.Store(c, struct{}{})
}
func (p *Proxy) untrackConn(c net.Conn) {
p.conns.Delete(c)
}
func (p *Proxy) closeAllConns() {
p.conns.Range(func(k, _ any) bool {
k.(net.Conn).SetDeadline(time.Now())
return true
})
}
func (p *Proxy) Start(newAddr string) error {
ln, err := net.Listen("tcp", newAddr)
if err != nil {
return fmt.Errorf("proxy: listen on %s: %w", newAddr, err)
}
newSrv := &http.Server{
Handler: p,
ReadTimeout: 60 * time.Second,
WriteTimeout: 60 * time.Second,
IdleTimeout: 120 * time.Second,
}
p.mu.Lock()
oldSrv := p.srv
p.addr = newAddr
p.srv = newSrv
p.mu.Unlock()
if oldSrv != nil {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
_ = oldSrv.Shutdown(ctx)
}
p.closeAllConns()
go func() {
if err := newSrv.Serve(ln); err != nil && err != http.ErrServerClosed {
logger.Error("proxy: Serve: %v", err)
}
}()
return nil
}
func (p *Proxy) Stop() {
p.mu.Lock()
srv := p.srv
p.mu.Unlock()
if srv != nil {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
_ = srv.Shutdown(ctx)
p.mu.Lock()
p.srv = nil
p.mu.Unlock()
}
p.closeAllConns()
}
// ObserveProxyRestart implements events.ProxyCommandObserver.
func (p *Proxy) ObserveProxyRestart(e events.ProxyRestartEvent) {
_ = p.Start(e.Addr)
}
// ObserveProxyStop implements events.ProxyCommandObserver.
func (p *Proxy) ObserveProxyStop(_ events.ProxyStopEvent) {
p.Stop()
}
func (p *Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodConnect {
p.handleConnect(w, r)
return
}
reqBody, err := io.ReadAll(io.LimitReader(r.Body, maxBodySize))
if err != nil {
http.Error(w, "failed to read request body", http.StatusBadRequest)
return
}
r.Body = io.NopCloser(bytes.NewReader(reqBody))
result := p.bus.EmitRequest(events.RequestEvent{Request: r, Body: reqBody})
if result.Drop {
http.Error(w, "request dropped", http.StatusForbidden)
return
}
interceptedReq, reqBody := result.Request, result.Body
interceptedReq.Body = io.NopCloser(bytes.NewReader(reqBody))
start := time.Now()
resp, err := forward(interceptedReq, p.client)
if err != nil {
http.Error(w, "bad gateway", http.StatusBadGateway)
return
}
defer resp.Body.Close()
var respBuf bytes.Buffer
reader := io.TeeReader(io.LimitReader(resp.Body, maxBodySize), &respBuf)
for k, vals := range resp.Header {
for _, v := range vals {
w.Header().Add(k, v)
}
}
w.WriteHeader(resp.StatusCode)
_, _ = io.Copy(w, reader)
respBody := respBuf.Bytes()
elapsed := time.Since(start).Milliseconds()
logBody := internalhttp.Decompress(resp.Header, respBody)
if internalhttp.IsBinary(resp.Header) {
logBody = nil
}
p.bus.EmitResponse(events.ResponseEvent{
Timestamp: start,
Host: interceptedReq.Host,
Proto: "HTTP/1.1",
Method: interceptedReq.Method,
URL: interceptedReq.URL.String(),
ReqHeaders: interceptedReq.Header,
ReqBody: reqBody,
StatusCode: resp.StatusCode,
RespHeaders: resp.Header,
RespBody: logBody,
DurationMs: elapsed,
TLS: false,
})
}
|
