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conn: use local ipvN vars in StdNetBind.Open

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This makes it clearer that they are fresh on each attempt,
and avoids the bookkeeping required to clearing them on failure.

Also, remove an unnecessary err != nil.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
This commit is contained in:
Josh Bleecher Snyder 2021-03-29 13:21:06 -07:00
parent 822f5a6d70
commit 204140016a
1 changed files with 9 additions and 11 deletions
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20
conn/bind_std.go
View file

@ -91,30 +91,28 @@ func (bind *StdNetBind) Open(uport uint16) (uint16, error) {
again:
port := int(uport)
var ipv4, ipv6 *net.UDPConn
bind.ipv4, port, err = listenNet("udp4", port)
ipv4, port, err = listenNet("udp4", port)
if err != nil && !errors.Is(err, syscall.EAFNOSUPPORT) {
bind.ipv4 = nil
return 0, err
}
bind.ipv6, port, err = listenNet("udp6", port)
if uport == 0 && err != nil && errors.Is(err, syscall.EADDRINUSE) && tries < 100 {
bind.ipv4.Close()
bind.ipv4 = nil
bind.ipv6 = nil
ipv6, port, err = listenNet("udp6", port)
if uport == 0 && errors.Is(err, syscall.EADDRINUSE) && tries < 100 {
ipv4.Close()
tries++
goto again
}
if err != nil && !errors.Is(err, syscall.EAFNOSUPPORT) {
bind.ipv4.Close()
bind.ipv4 = nil
bind.ipv6 = nil
ipv4.Close()
return 0, err
}
if bind.ipv4 == nil && bind.ipv6 == nil {
if ipv4 == nil && ipv6 == nil {
return 0, syscall.EAFNOSUPPORT
}
bind.ipv4 = ipv4
bind.ipv6 = ipv6
return uint16(port), nil
}