76 lines
1.8 KiB
Go
76 lines
1.8 KiB
Go
package goupnp
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import (
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"io"
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"net"
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"git.cyrilix.bzh/cyrilix/goupnp/httpu"
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)
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// httpuClient creates a HTTPU client that multiplexes to all multicast-capable
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// IPv4 addresses on the host. Returns a function to clean up once the client is
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// no longer required.
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func httpuClient() (httpu.ClientInterfaceCtx, func(), error) {
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addrs, err := localIPv4MCastAddrs()
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if err != nil {
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return nil, nil, ctxError(err, "requesting host IPv4 addresses")
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}
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closers := make([]io.Closer, 0, len(addrs))
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delegates := make([]httpu.ClientInterfaceCtx, 0, len(addrs))
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for _, addr := range addrs {
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c, err := httpu.NewHTTPUClientAddr(addr)
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if err != nil {
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return nil, nil, ctxErrorf(err,
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"creating HTTPU client for address %s", addr)
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}
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closers = append(closers, c)
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delegates = append(delegates, c)
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}
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closer := func() {
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for _, c := range closers {
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c.Close()
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}
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}
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return httpu.NewMultiClientCtx(delegates), closer, nil
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}
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// localIPv2MCastAddrs returns the set of IPv4 addresses on multicast-able
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// network interfaces.
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func localIPv4MCastAddrs() ([]string, error) {
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ifaces, err := net.Interfaces()
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if err != nil {
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return nil, ctxError(err, "requesting host interfaces")
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}
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// Find the set of addresses to listen on.
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var addrs []string
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for _, iface := range ifaces {
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if iface.Flags&net.FlagMulticast == 0 || iface.Flags&net.FlagLoopback != 0 || iface.Flags&net.FlagUp == 0 {
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// Does not support multicast or is a loopback address.
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continue
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}
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ifaceAddrs, err := iface.Addrs()
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if err != nil {
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return nil, ctxErrorf(err,
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"finding addresses on interface %s", iface.Name)
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}
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for _, netAddr := range ifaceAddrs {
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addr, ok := netAddr.(*net.IPNet)
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if !ok {
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// Not an IPNet address.
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continue
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}
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if addr.IP.To4() == nil {
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// Not IPv4.
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continue
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}
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addrs = append(addrs, addr.IP.String())
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}
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}
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return addrs, nil
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}
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