Add disable_ipv6, tidy up calls to string_is_ip_address().

[exim.git] / doc / doc-txt / NewStuff

diff --git a/doc/doc-txt/NewStuff b/doc/doc-txt/NewStuff
index 24993b5ac70473a2058ab2c2d1819066b9bd1665..604e59a9abc651f69a4a131e2e4ce7d0b6a71875 100644 (file)
--- a/doc/doc-txt/NewStuff
+++ b/doc/doc-txt/NewStuff
@@ -1,4 +1,4 @@
-$Cambridge: exim/doc/doc-txt/NewStuff,v 1.42 2005/05/17 15:00:04 ph10 Exp $
+$Cambridge: exim/doc/doc-txt/NewStuff,v 1.78 2005/12/06 10:25:59 ph10 Exp $

 
 New Features in Exim
 --------------------
 
 New Features in Exim
 --------------------


@@ -8,265 +8,39 @@ but have not yet made it into the main manual (which is most conveniently
 updated when there is a relatively large batch of changes). The doc/ChangeLog
 file contains a listing of all changes, including bug fixes.
 
 updated when there is a relatively large batch of changes). The doc/ChangeLog
 file contains a listing of all changes, including bug fixes.
 

-
-Exim version 4.52
------------------
-
-TF/01 Support for checking Client SMTP Authorization has been added. CSA is a
-      system which allows a site to advertise which machines are and are not
-      permitted to send email. This is done by placing special SRV records in
-      the DNS, which are looked up using the client's HELO domain. At this
-      time CSA is still an Internet-Draft.
-
-      Client SMTP Authorization checks are performed by the ACL condition
-      verify=csa. This will fail if the client is not authorized. If there is
-      a DNS problem, or if no valid CSA SRV record is found, or if the client
-      is authorized, the condition succeeds. These three cases can be
-      distinguished using the expansion variable $csa_status, which can take
-      one of the values "fail", "defer", "unknown", or "ok". The condition
-      does not itself defer because that would be likely to cause problems
-      for legitimate email.
-
-      The error messages produced by the CSA code include slightly more
-      detail. If $csa_status is "defer" this may be because of problems
-      looking up the CSA SRV record, or problems looking up the CSA target
-      address record. There are four reasons for $csa_status being "fail":
-      the client's host name is explicitly not authorized; the client's IP
-      address does not match any of the CSA target IP addresses; the client's
-      host name is authorized but it has no valid target IP addresses (e.g.
-      the target's addresses are IPv6 and the client is using IPv4); or the
-      client's host name has no CSA SRV record but a parent domain has
-      asserted that all subdomains must be explicitly authorized.
-
-      The verify=csa condition can take an argument which is the domain to
-      use for the DNS query. The default is verify=csa/$sender_helo_name.
-
-      This implementation includes an extension to CSA. If the query domain
-      is an address literal such as [192.0.2.95], or if it is a bare IP
-      address, Exim will search for CSA SRV records in the reverse DNS as if
-      the HELO domain was e.g. 95.2.0.192.in-addr.arpa. Therefore it is
-      meaningful to say, for example, verify=csa/$sender_host_address - in
-      fact, this is the check that Exim performs if the client does not say
-      HELO. This extension can be turned off by setting the main
-      configuration option dns_csa_use_reverse = false.
-
-      If a CSA SRV record is not found for the domain itself, then a search
-      is performed through its parent domains for a record which might be
-      making assertions about subdomains. The maximum depth of this search is
-      limited using the main configuration option dns_csa_search_limit, which
-      takes the value 5 by default. Exim does not look for CSA SRV records in
-      a top level domain, so the default settings handle HELO domains as long
-      as seven (hostname.five.four.three.two.one.com) which encompasses the
-      vast majority of legitimate HELO domains.
-
-      The dnsdb lookup also has support for CSA. Although dnsdb already
-      supports SRV lookups, this is not sufficient because of the extra
-      parent domain search behaviour of CSA, and (as with PTR lookups)
-      dnsdb also turns IP addresses into lookups in the reverse DNS space.
-      The result of ${lookup dnsdb {csa=$sender_helo_name} } has two
-      space-separated fields: an authorization code and a target host name.
-      The authorization code can be "Y" for yes, "N" for no, "X" for explicit
-      authorization required but absent, or "?" for unknown.
-
-PH/01 The amount of output produced by the "make" process has been reduced,
-      because the compile lines are often rather long, making it all pretty
-      unreadable. The new style is along the lines of the 2.6 Linux kernel:
-      just a short line for each module that is being compiled or linked.
-      However, it is still possible to get the full output, by calling "make"
-      like this:
-
-        FULLECHO='' make -e
-
-      The value of FULLECHO defaults to "@", the flag character that suppresses
-      command reflection in "make". When you ask for the full output, it is
-      given in addition to the the short output.
-
-PH/02 There have been two changes concerned with submission mode:
-
-      (a) A new option, /name=value, makes it possible to supply a user name
-          to be inserted into any created Sender: header line. Typically, this
-          would be looked up from $authenticated_id.
-
-      (b) The envelope sender address is forced to be the same as the
-          submission mode sender address.
-
-
-Version 4.51
+Version 4.61

 ------------
 
 ------------
 

-PH/01 The format in which GnuTLS parameters are written to the gnutls-param
-      file in the spool directory has been changed. This change has been made
-      to alleviate problems that some people had with the generation of the
-      parameters by Exim when /dev/random was exhausted. In this situation,
-      Exim would hang until /dev/random acquired some more entropy.
-
-      The new code exports and imports the DH and RSA parameters in PEM
-      format. This means that the parameters can be generated externally using
-      the certtool command that is part of GnuTLS.
-
-      To replace the parameters with new ones, instead of deleting the file
-      and letting Exim re-create it, you can generate new parameters using
-      certtool and, when this has been done, replace Exim's cache file by
-      renaming. The relevant commands are something like this:
-
-        # rm -f new.params
-        # touch new.params
-        # chown exim:exim new.params
-        # chmod 0400 new.params
-        # certtool --generate-privkey --bits 512 >new.params
-        # echo "" >>new.params
-        # certtool --generate-dh-params --bits 1024 >> new.params
-        # mv new.params params
-
-      If Exim never has to generate the parameters itself, the possibility of
-      stalling is removed.
-
-PH/02 A new expansion item for dynamically loading and calling a locally-
-      written C function is now provided, if Exim is compiled with
-
-        EXPAND_DLFUNC=yes
-
-      set in Local/Makefile. The facility is not included by default (a
-      suitable error is given if you try to use it when it is not there.)
-
-      If you enable EXPAND_DLFUNC, you should also be aware of the new redirect
-      router option forbid_filter_dlfunc. If you have unprivileged users on
-      your system who are permitted to create filter files, you might want to
-      set forbid_filter_dlfunc=true in the appropriate router, to stop them
-      using ${dlfunc to run code within Exim.
+PH/01 There is a new global option called disable_ipv6, which does exactly what
+      its name implies. If set true, even if the Exim binary has IPv6 support,
+      no IPv6 activities take place. AAAA records are never looked up as a for
+      host names given in manual routing data or elsewhere. AAAA records that
+      are received from the DNS as additional data for MX records are ignored.
+      Any IPv6 addresses that are listed in local_interfaces, manualroute route
+      data, etc. are also ignored. If IP literals are enabled, the ipliteral
+      router declines to handle IPv6 literal addresses.

 
 

-      You load and call an external function like this:

 
 

-        ${dlfunc{/some/file}{function}{arg1}{arg2}...}
-
-      Once loaded, Exim remembers the dynamically loaded object so that it
-      doesn't reload the same object file in the same Exim process (but of
-      course Exim does start new processes frequently).
-
-      There may be from zero to eight arguments to the function. When compiling
-      a local function that is to be called in this way, local_scan.h should be
-      included. The Exim variables and functions that are defined by that API
-      are also available for dynamically loaded functions. The function itself
-      must have the following type:
-
-        int dlfunction(uschar **yield, int argc, uschar *argv[])
-
-      Where "uschar" is a typedef for "unsigned char" in local_scan.h. The
-      function should return one of the following values:
-
-      OK            Success. The string that is placed in "yield" is put into
-                    the expanded string that is being built.
-
-      FAIL          A non-forced expansion failure occurs, with the error
-                    message taken from "yield", if it is set.
-
-      FAIL_FORCED   A forced expansion failure occurs, with the error message
-                    taken from "yield" if it is set.
-
-      ERROR         Same as FAIL, except that a panic log entry is written.
-
-      When compiling a function that is to be used in this way with gcc,
-      you need to add -shared to the gcc command. Also, in the Exim build-time
-      configuration, you must add -export-dynamic to EXTRALIBS.
-
-TF/01 $received_time is a new expansion variable containing the time and date
-      as a number of seconds since the start of the Unix epoch when the
-      current message was received.
-
-PH/03 There is a new value for RADIUS_LIB_TYPE that can be set in
-      Local/Makefile. It is RADIUSCLIENTNEW, and it requests that the new API,
-      in use from radiusclient 0.4.0 onwards, be used. It does not appear to be
-      possible to detect the different versions automatically.
-
-PH/04 There is a new option called acl_not_smtp_mime that allows you to scan
-      MIME parts in non-SMTP messages. It operates in exactly the same way as
-      acl_smtp_mime
-
-PH/05 It is now possible to redefine a macro within the configuration file.
-      The macro must have been previously defined within the configuration (or
-      an included file). A definition on the command line using the -D option
-      causes all definitions and redefinitions within the file to be ignored.
-      In other words, -D overrides any values that are set in the file.
-      Redefinition is specified by using '==' instead of '='. For example:
-
-        MAC1 =  initial value
-        ...
-        MAC1 == updated value
-
-      Redefinition does not alter the order in which the macros are applied to
-      the subsequent lines of the configuration file. It is still the same
-      order in which the macros were originally defined. All that changes is
-      the macro's value. Redefinition makes it possible to accumulate values.
-      For example:
-
-        MAC1 =  initial value
-        ...
-        MAC1 == MAC1 and something added
-
-      This can be helpful in situations where the configuration file is built
-      from a number of other files.
-
-PH/06 Macros may now be defined or redefined between router, transport,
-      authenticator, or ACL definitions, as well as in the main part of the
-      configuration. They may not, however, be changed within an individual
-      driver or ACL, or in the local_scan, retry, or rewrite sections of the
-      configuration.
-
-PH/07 $acl_verify_message is now set immediately after the failure of a
-      verification in an ACL, and so is available in subsequent modifiers. In
-      particular, the message can be preserved by coding like this:
-
-         warn  !verify = sender
-               set acl_m0 = $acl_verify_message
-
-      Previously, $acl_verify_message was set only while expanding "message"
-      and "log_message" when a very denied access.
-
-PH/08 The redirect router has two new options, sieve_useraddress and
-      sieve_subaddress. These are passed to a Sieve filter to specify the :user
-      and :subaddress parts of an address. Both options are unset by default.
-      However, when a Sieve filter is run, if sieve_useraddress is unset, the
-      entire original local part (including any prefix or suffix) is used for
-      :user. An unset subaddress is treated as an empty subaddress.
+Version 4.60
+------------

 
 

-PH/09 Quota values can be followed by G as well as K and M.
+The documentation is up-to-date for the 4.60 release. Major new features since
+the 4.50 release are:

 
 

-PH/10 $message_linecount is a new variable that contains the total number of
-      lines in the header and body of the message. Compare $body_linecount,
-      which is the count for the body only. During the DATA and
-      content-scanning ACLs, $message_linecount contains the number of lines
-      received. Before delivery happens (that is, before filters, routers, and
-      transports run) the count is increased to include the Received: header
-      line that Exim standardly adds, and also any other header lines that are
-      added by ACLs. The blank line that separates the message header from the
-      body is not counted. Here is an example of the use of this variable in a
-      DATA ACL:
+. Support for SQLite.

 
 

-        deny message   = Too many lines in message header
-             condition = \
-               ${if <{250}{${eval: $message_linecount - $body_linecount}}}
+. Support for IGNOREQUOTA in LMTP.

 
 

-      In the MAIL and RCPT ACLs, the value is zero because at that stage the
-      message has not yet been received.
+. Extensions to the "submission mode" features.

 
 

-PH/11 In a ${run expansion, the variable $value (which contains the standard
-      output) is now also usable in the "else" string.
+. Support for Client SMTP Authorization (CSA).

 
 

-PH/12 In a pipe transport, although a timeout while waiting for the pipe
-      process to complete was treated as a delivery failure, a timeout while
-      writing the message to the pipe was logged, but erroneously treated as a
-      successful delivery. Such timeouts include transport filter timeouts. For
-      consistency with the overall process timeout, these timeouts are now
-      treated as errors, giving rise to delivery failures by default. However,
-      there is now a new Boolean option for the pipe transport called
-      timeout_defer, which, if set TRUE, converts the failures into defers for
-      both kinds of timeout. A transport filter timeout is now identified in
-      the log output.
+. Support for ratelimiting hosts and users.

 
 

+. New expansion items to help with the BATV "prvs" scheme.

 
 

-Version 4.50
-------------
+. A "match_ip" condition, that matches an IP address against a list.

 
 

-The documentation is up-to-date for the 4.50 release.
+There are many more minor changes.

 
 ****
 
 ****