TFO: change the default for hosts_try_fastopen, enabling use by default

[users/heiko/exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index e2f1eafe1f3cda5cf3179bc9250cbed27d052c8f..bfacdef81e69f5e311acdc2249bc12d05c3aba0d 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -10957,11 +10957,15 @@ If the string is a single variable of type certificate,
 returns the SHA-1 hash fingerprint of the certificate.
 
 
 returns the SHA-1 hash fingerprint of the certificate.
 
 

-.vitem &*${sha256:*&<&'string'&>&*}*&
+.vitem &*${sha256:*&<&'string'&>&*}*& &&&
+       &*${sha2:*&<&'string'&>&*}*& &&&
+       &*${sha2_<n>:*&<&'string'&>&*}*&

 .cindex "SHA-256 hash"
 .cindex "SHA-256 hash"

+.cindex "SHA-2 hash"

 .cindex certificate fingerprint
 .cindex "expansion" "SHA-256 hashing"
 .cindex "&%sha256%& expansion item"
 .cindex certificate fingerprint
 .cindex "expansion" "SHA-256 hashing"
 .cindex "&%sha256%& expansion item"

+.cindex "&%sha2%& expansion item"

 The &%sha256%& operator computes the SHA-256 hash value of the string
 and returns
 it as a 64-digit hexadecimal number, in which any letters are in upper case.
 The &%sha256%& operator computes the SHA-256 hash value of the string
 and returns
 it as a 64-digit hexadecimal number, in which any letters are in upper case.


@@ -10969,6 +10973,15 @@ it as a 64-digit hexadecimal number, in which any letters are in upper case.
 If the string is a single variable of type certificate,
 returns the SHA-256 hash fingerprint of the certificate.
 
 If the string is a single variable of type certificate,
 returns the SHA-256 hash fingerprint of the certificate.
 

+.new
+The operator can also be spelled &%sha2%& and does the same as &%sha256%&
+(except for certificates, which are not supported).
+Finally, if an underbar
+and a number is appended it specifies the output length, selecting a
+member of the SHA-2 family of hash functions.
+Values of 256, 384 and 512 are accepted, with 256 being the default.
+.wen
+

 
 .vitem &*${sha3:*&<&'string'&>&*}*& &&&
        &*${sha3_<n>:*&<&'string'&>&*}*&
 
 .vitem &*${sha3:*&<&'string'&>&*}*& &&&
        &*${sha3_<n>:*&<&'string'&>&*}*&


@@ -24579,13 +24592,15 @@ been started will not be passed to a new delivery process for sending another
 message on the same connection. See section &<<SECTmulmessam>>& for an
 explanation of when this might be needed.
 
 message on the same connection. See section &<<SECTmulmessam>>& for an
 explanation of when this might be needed.
 

-.option hosts_noproxy_tls smtp "host list&!!" *
+.new
+.option hosts_noproxy_tls smtp "host list&!!" unset

 .cindex "TLS" "passing connection"
 .cindex "multiple SMTP deliveries"
 .cindex "TLS" "multiple message deliveries"
 For any host that matches this list, a TLS session which has
 been started will not be passed to a new delivery process for sending another
 message on the same session.
 .cindex "TLS" "passing connection"
 .cindex "multiple SMTP deliveries"
 .cindex "TLS" "multiple message deliveries"
 For any host that matches this list, a TLS session which has
 been started will not be passed to a new delivery process for sending another
 message on the same session.

+.wen

 
 The traditional implementation closes down TLS and re-starts it in the new
 process, on the same open TCP connection, for each successive message
 
 The traditional implementation closes down TLS and re-starts it in the new
 process, on the same open TCP connection, for each successive message


@@ -24681,7 +24696,7 @@ This option provides a list of servers to which, provided they announce
 CHUNKING support, Exim will attempt to use BDAT commands rather than DATA.
 BDAT will not be used in conjunction with a transport filter.
 
 CHUNKING support, Exim will attempt to use BDAT commands rather than DATA.
 BDAT will not be used in conjunction with a transport filter.
 

-.option hosts_try_dane smtp "host list&!!" unset
+.option hosts_try_dane smtp "host list&!!" *

 .cindex DANE "transport options"
 .cindex DANE "attempting for certain servers"
 If built with DANE support, Exim  will lookup a
 .cindex DANE "transport options"
 .cindex DANE "attempting for certain servers"
 If built with DANE support, Exim  will lookup a


@@ -24691,7 +24706,7 @@ a DANE-verified TLS connection is made to that host;
 there will be no fallback to in-clear communication.
 See section &<<SECDANE>>&.
 
 there will be no fallback to in-clear communication.
 See section &<<SECDANE>>&.
 

-.option hosts_try_fastopen smtp "host list&!!" unset
+.option hosts_try_fastopen smtp "host list&!!" *

 .cindex "fast open, TCP" "enabling, in client"
 .cindex "TCP Fast Open" "enabling, in client"
 .cindex "RFC 7413" "TCP Fast Open"
 .cindex "fast open, TCP" "enabling, in client"
 .cindex "TCP Fast Open" "enabling, in client"
 .cindex "RFC 7413" "TCP Fast Open"