如何使用net/http获取服务器在服务器中的自身地址? [英] How to get Server's own address in a server using net/http?
问题描述
我想使用Go的net/http包编写一个HTTP服务器,其响应取决于HTTP连接的服务器端IP地址.
I would like to write a HTTP server using the Go's net/http package, with the reaction that would depend on server side IP address of the HTTP connection.
换句话说,我正在寻找的等效于CGI的"SERVER_ADDR"变量.
In other words, what I am looking for is equivalent of CGI's "SERVER_ADDR" variable.
http.Request中最接近的字段是主机"-但由于仅在请求使用文字地址时它才等于地址,因此我无法使用它(服务器可能按名称使用).
The closest field in http.Request is "Host" - but since it will only be equal to an address if the request uses a literal address, I can not use it (the server might be used by name).
在> https://golang.org/src/net/http/server.go ,似乎到达服务器地址的唯一方法是在处理程序中建立Hijack()连接,并为同一连接上的后续请求实现后续HTTP解析,但是这样做似乎非常不明智至少要说...
Looking at the sources at https://golang.org/src/net/http/server.go, seems the only way to get to the server's address is to Hijack() the connection within a handler and implement subsequent HTTP parsing for the subsequent requests on the same connection, but it looks very inelegant to say the least...
似乎理想的解决方案是对golang标准库中的http/request和http/server进行如下修改:
It seems like the ideal solution would be to have the http/request and http/server in the golang standard library modified as follows:
diff -u go-stock-library/request.go ./request.go
--- go-stock-library/request.go 2016-04-13 17:31:48.000000000 +0200
+++ ./request.go 2016-04-13 17:32:40.000000000 +0200
@@ -227,6 +227,15 @@
// This field is ignored by the HTTP client.
RemoteAddr string
+ // LocalAddr allows HTTP servers and other software to record
+ // the network address that the request was sent to, usually for
+ // logging. This field is not filled in by ReadRequest and
+ // has no defined format. The HTTP server in this package
+ // sets LocalAddr to an "IP:port" address before invoking a
+ // handler.
+ // This field is ignored by the HTTP client.
+ LocalAddr string
+
// RequestURI is the unmodified Request-URI of the
// Request-Line (RFC 2616, Section 5.1) as sent by the client
// to a server. Usually the URL field should be used instead.
diff -u go-stock-library/server.go ./server.go
--- go-stock-library/server.go 2016-04-13 17:29:19.000000000 +0200
+++ ./server.go 2016-04-13 17:31:38.000000000 +0200
@@ -161,6 +161,13 @@
// This is the value of a Handler's (*Request).RemoteAddr.
remoteAddr string
+ // serverAddr is rwc.LocalAddr().String(). It is not populated synchronously
+ // inside the Listener's Accept goroutine, as some implementations block.
+ // It is populated immediately inside the (*conn).serve goroutine.
+ // This is the value of a Handler's (*Request).LocalAddr.
+ localAddr string
+
+
// tlsState is the TLS connection state when using TLS.
// nil means not TLS.
tlsState *tls.ConnectionState
@@ -736,6 +743,7 @@
delete(req.Header, "Host")
req.RemoteAddr = c.remoteAddr
+ req.LocalAddr = c.localAddr
req.TLS = c.tlsState
if body, ok := req.Body.(*body); ok {
body.doEarlyClose = true
@@ -1382,6 +1390,7 @@
// Serve a new connection.
func (c *conn) serve() {
c.remoteAddr = c.rwc.RemoteAddr().String()
+ c.localAddr = c.rwc.LocalAddr().String()
defer func() {
if err := recover(); err != nil {
const size = 64 << 10
,然后以一种简洁的方式在代码中使用新的LocalAddr.
and then use the new LocalAddr in the code in a nice and clean way.
是否有一种更清洁的方法?
Is there a cleaner way to do this?
推荐答案
我个人不会修改标准库中的任何内容,而可以通过其他方式获得.从每个连接中解析出来是否有一些优势?
I personally wouldn't modify anything in the standard library for something I could get other ways. Is there some advantage to parsing it out of every connection?
可能有一种更简单的方法,但是我有以下内容.
There is probably a simpler way, but I have the following.
func getMyInterfaceAddr() (net.IP, error) {
ifaces, err := net.Interfaces()
if err != nil {
return nil, err
}
addresses := []net.IP{}
for _, iface := range ifaces {
if iface.Flags&net.FlagUp == 0 {
continue // interface down
}
if iface.Flags&net.FlagLoopback != 0 {
continue // loopback interface
}
addrs, err := iface.Addrs()
if err != nil {
continue
}
for _, addr := range addrs {
var ip net.IP
switch v := addr.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
}
if ip == nil || ip.IsLoopback() {
continue
}
ip = ip.To4()
if ip == nil {
continue // not an ipv4 address
}
addresses = append(addresses, ip)
}
}
if len(addresses) == 0 {
return nil, fmt.Errorf("no address Found, net.InterfaceAddrs: %v", addresses)
}
//only need first
return addresses[0], nil
}
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