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50 lines
1.2 KiB
50 lines
1.2 KiB
package sip
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import (
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"errors"
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"net"
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)
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func RouteMessage(via *Via, contact *Addr, old *Msg) (msg *Msg, dest string, err error) {
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var host string
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var port uint16
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msg = new(Msg)
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*msg = *old // Start off with a shallow copy.
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if msg.Contact == nil {
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msg.Contact = contact
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}
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if msg.IsResponse {
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if via.CompareHostPort(msg.Via) {
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msg.Via = msg.Via.Next
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}
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if received, ok := msg.Via.Params["received"]; ok {
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return msg, received, nil
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} else {
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host, port = msg.Via.Host, msg.Via.Port
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}
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} else {
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if contact.CompareHostPort(msg.Route) {
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msg.Route = msg.Route.Next
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}
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if msg.Route != nil {
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if msg.Method == "REGISTER" {
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return nil, "", errors.New("Don't route REGISTER requests")
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}
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if msg.Route.Uri.Params.Has("lr") {
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// RFC3261 16.12.1.1 Basic SIP Trapezoid
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host, port = msg.Route.Uri.Host, msg.Route.Uri.GetPort()
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} else {
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// RFC3261 16.12.1.2: Traversing a Strict-Routing Proxy
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msg.Route = old.Route.Copy()
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msg.Route.Last().Next = &Addr{Uri: msg.Request}
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msg.Request = msg.Route.Uri
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msg.Route = msg.Route.Next
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host, port = msg.Request.Host, msg.Request.GetPort()
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}
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} else {
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host, port = msg.Request.Host, msg.Request.GetPort()
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}
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}
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dest = net.JoinHostPort(host, portstr(port))
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return
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}
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