diff options
| -rw-r--r-- | apps/s_client.c | 2 | ||||
| -rw-r--r-- | doc/man1/s_client.pod | 14 |
2 files changed, 10 insertions, 6 deletions
diff --git a/apps/s_client.c b/apps/s_client.c index 663ab49f51..8af3853e4b 100644 --- a/apps/s_client.c +++ b/apps/s_client.c @@ -651,7 +651,7 @@ const OPTIONS s_client_options[] = { "CA file for certificate verification (PEM format)"}, {"nocommands", OPT_NOCMDS, '-', "Do not use interactive command letters"}, {"servername", OPT_SERVERNAME, 's', - "Set TLS extension servername in ClientHello"}, + "Set TLS extension servername (SNI) in ClientHello (default)"}, {"noservername", OPT_NOSERVERNAME, '-', "Do not send the server name (SNI) extension in the ClientHello"}, {"tlsextdebug", OPT_TLSEXTDEBUG, '-', diff --git a/doc/man1/s_client.pod b/doc/man1/s_client.pod index 5414ffa41e..9f6084d53e 100644 --- a/doc/man1/s_client.pod +++ b/doc/man1/s_client.pod @@ -159,16 +159,20 @@ Use IPv6 only. =item B<-servername name> Set the TLS SNI (Server Name Indication) extension in the ClientHello message to -the given value. +the given value. If both this option and the B<-noservername> are not given, the +TLS SNI extension is still set to the hostname provided to the B<-connect> option, +or "localhost" if B<-connect> has not been supplied. This is default since OpenSSL +1.1.1. + +Even though SNI name should normally be a DNS name and not an IP address, this +option will not make the distinction when parsing B<-connect> and will send +IP address if one passed. =item B<-noservername> Suppresses sending of the SNI (Server Name Indication) extension in the ClientHello message. Cannot be used in conjunction with the B<-servername> or -<-dane_tlsa_domain> options. If this option is not given then the hostname -provided to the B<-connect> option is used in the SNI extension, or "localhost" -if B<-connect> has not been supplied. Note that an SNI name should normally be a -DNS name and not an IP address. +<-dane_tlsa_domain> options. =item B<-cert certname> |