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Merge pull request #1 from Alkorin/http
Add HTTP proxy mode
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,71 @@ | ||
package main | ||
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import ( | ||
"context" | ||
"io" | ||
"log" | ||
"net" | ||
"net/http" | ||
"time" | ||
) | ||
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type NameResolver interface { | ||
Resolve(ctx context.Context, name string) (context.Context, net.IP, error) | ||
} | ||
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type httpProxy struct { | ||
Resolver NameResolver | ||
Verbose bool | ||
Logger *log.Logger | ||
} | ||
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func (p *httpProxy) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
_, ip, err := p.Resolver.Resolve(r.Context(), r.URL.Hostname()) | ||
if err != nil { | ||
http.Error(w, err.Error(), http.StatusServiceUnavailable) | ||
return | ||
} | ||
p.Logger.Printf("Command: %s, FQDN: %q, IP: %q, port: %s", r.Method, r.URL.Hostname(), ip.String(), r.URL.Port()) | ||
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if r.Method == http.MethodConnect { | ||
dest_conn, err := net.DialTimeout("tcp", ip.String()+":"+r.URL.Port(), 10*time.Second) | ||
if err != nil { | ||
log.Printf("Faild to dial: %s", err.Error()) | ||
http.Error(w, err.Error(), http.StatusServiceUnavailable) | ||
return | ||
} | ||
w.WriteHeader(http.StatusOK) | ||
hijacker, ok := w.(http.Hijacker) | ||
if !ok { | ||
http.Error(w, "Hijacking not supported", http.StatusInternalServerError) | ||
return | ||
} | ||
client_conn, _, err := hijacker.Hijack() | ||
if err != nil { | ||
http.Error(w, err.Error(), http.StatusServiceUnavailable) | ||
} | ||
go func() { | ||
defer dest_conn.Close() | ||
io.Copy(dest_conn, client_conn) | ||
}() | ||
go func() { | ||
defer client_conn.Close() | ||
io.Copy(client_conn, dest_conn) | ||
}() | ||
} else { | ||
r.URL.Host = ip.String() | ||
resp, err := http.DefaultTransport.RoundTrip(r) | ||
if err != nil { | ||
http.Error(w, err.Error(), http.StatusServiceUnavailable) | ||
return | ||
} | ||
defer resp.Body.Close() | ||
for k, vv := range resp.Header { | ||
for _, v := range vv { | ||
w.Header().Add(k, v) | ||
} | ||
} | ||
w.WriteHeader(resp.StatusCode) | ||
io.Copy(w, resp.Body) | ||
} | ||
} |
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