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Update SNI code

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This commit is contained in:
Neil Alexander
2021-08-01 21:36:51 +01:00
parent f094cf34bf
commit bbdff033ce
2 changed files with 15 additions and 9 deletions
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14
src/core/link.go
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@ -98,10 +98,18 @@ func (l *links) call(u *url.URL, sintf string) error {
l.tcp.call(pathtokens[0], tcpOpts, sintf)
case "tls":
tcpOpts.upgrade = l.tcp.tls.forDialer
tcpOpts.tlsSNI = u.Query().Get("sni")
// SNI headers must contain hostnames and not IP addresses, so we must make sure
// that we do not populate the SNI with an IP literal. We do this by splitting
// the host-port combo from the query option and then seeing if it parses to an
// IP address successfully or not.
if sni := u.Query().Get("sni"); sni != "" {
if host, _, err := net.SplitHostPort(sni); err == nil && net.ParseIP(host) == nil {
tcpOpts.tlsSNI = host
}
}
// If the SNI is not configured still because the above failed then we'll try
// again but this time we'll use the host part of the peering URI instead.
if tcpOpts.tlsSNI == "" {
// SNI headers must contain hostnames and not IP addresses, so we must make sure
// that we do not populate the SNI with an IP literal.
if host, _, err := net.SplitHostPort(u.Host); err == nil && net.ParseIP(host) == nil {
tcpOpts.tlsSNI = host
}