X-Git-Url: https://git.exim.org/users/jgh/exim.git/blobdiff_plain/7d50add39dc49d96962759c4376004cd2280ebe6..f9a68dd38e32cbd8f01719e70a2858fe88e627fd:/doc/doc-txt/NewStuff diff --git a/doc/doc-txt/NewStuff b/doc/doc-txt/NewStuff index 7a5bf4f15..b6b2d66da 100644 --- a/doc/doc-txt/NewStuff +++ b/doc/doc-txt/NewStuff @@ -1,4 +1,4 @@ -$Cambridge: exim/doc/doc-txt/NewStuff,v 1.47 2005/05/25 20:33:28 tom Exp $ +$Cambridge: exim/doc/doc-txt/NewStuff,v 1.65 2005/08/23 08:50:07 ph10 Exp $ New Features in Exim -------------------- @@ -8,6 +8,106 @@ 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. +Exim version 4.53 +----------------- + +TK/01 Added the "success_on_redirect" address verification option. When an + address generates new addresses during routing, Exim will abort + verification with "success" when more than one address has been + generated, but continue to verify a single new address. The latter + does not happen when the new "success_on_redirect" option is set, like + + require verify = recipient/success_on_redirect/callout=10s + + In that case, verification will succeed when a router generates a new + address. + +PH/01 Support for SQLite database lookups has been added. This is another + query-style lookup, but it is slightly different from the others because + a file name is required in addition to the SQL query. This is because an + SQLite database is a single file and there is no daemon as in other SQL + databases. The interface to Exim requires the name of the file, as an + absolute path, to be given at the start of the query. It is separated + from the query by white space. This means that the path name cannot + contain white space. Here is a lookup expansion example: + + ${lookup sqlite {/some/thing/sqlitedb \ + select name from aliases where id='ph10';}} + + In a list, the syntax is similar. For example: + + domainlist relay_domains = sqlite;/some/thing/sqlitedb \ + select * from relays where ip='$sender_host_address'; + + The only character affected by the ${quote_sqlite: operator is a single + quote, which it doubles. + + The SQLite library handles multiple simultaneous accesses to the database + internally. Multiple readers are permitted, but only one process can + update at once. Attempts to access the database while it is being updated + are rejected after a timeout period, during which the SQLite library + waits for the lock to be released. In Exim, the default timeout is set + to 5 seconds, but it can be changed by means of the sqlite_lock_timeout + option. + + Note that you must set LOOKUP_SQLITE=yes in Local/Makefile in order to + obtain SQLite support, and you will also need to add -lsqlite3 to the + EXTRALIBS setting. And of course, you have to install SQLite on your + host first. + +PH/02 The variable $message_id is now deprecated, to be replaced by + $message_exim_id, which makes it clearer which ID is being referenced. + +PH/03 The use of forbid_filter_existstest now also locks out the use of the + ${stat: expansion item. + +PH/04 The IGNOREQUOTA extension to the LMTP protocol is now available in both + the lmtp transport and the smtp transport running in LMTP mode. In the + lmtp transport there is a new Boolean option called ignore_quota, and in + the smtp transport there is a new Boolean option called + lmtp_ignore_quota. If either of these options is set TRUE, the string + "IGNOREQUOTA" is added to RCPT commands when using the LMTP protocol, + provided that the server has advertised support for IGNOREQUOTA in its + response to the LHLO command. + +PH/05 Previously, if "verify = helo" was set in an ACL, the condition was true + only if the host matched helo_try_verify_hosts, which caused the + verification to occur when the EHLO/HELO command was issued. The ACL just + tested the remembered result. Now, if a previous verification attempt has + not happened, "verify = helo" does it there and then. + +PH/06 It is now possible to specify a port number along with a host name or + IP address in the list of hosts defined in the manualroute or + queryprogram routers, fallback_hosts, or the "hosts" option of the smtp + transport. These all override any port specification on the transport. + The relatively standard syntax of using a colon separator has been + adopted, but there are some gotchas that need attention: + + * In all these lists of hosts, colon is the default separator, so either + the colon that specifies a port must be doubled, or the separator must + be changed. The following two examples have the same effect: + + fallback_hosts = host1.tld::1225 : host2.tld::1226 + fallback_hosts = <; host1.tld:1225 ; host2.tld:1226 + + * When IPv6 addresses are involved, it gets worse, because they contain + colons of their own. To make this case easier, it is permitted to + enclose an IP address (either v4 or v6) in square brackets if a port + number follows. Here's an example from a manualroute router: + + route_list = * ". +PH/02 There's a new verify callout option, "fullpostmaster", which first acts + as "postmaster" and checks the recipient . If that + fails, it tries just , without a domain, in accordance with + the specification in RFC 2821. + +PH/03 The action of the auto_thaw option has been changed. It no longer applies + to frozen bounce messages. + +TK/02 There are two new expansion items to help with the implementation of + the BATV "prvs" scheme in an Exim configuration: + + + ${prvs {
}{}{[KEYNUM]}} + + The "prvs" expansion item takes three arguments: A qualified RFC2821 + email address, a key and an (optional) key number. All arguments are + expanded before being used, so it is easily possible to lookup a key + and key number using the address as the lookup key. The key number is + optional and defaults to "0". The item will expand to a "prvs"-signed + email address, to be typically used with the "return_path" option on + a smtp transport. The decision if BATV should be used with a given + sender/recipient pair should be done on router level, to avoid having + to set "max_rcpt = 1" on the transport. + + + ${prvscheck {
}{}{}} + + The "prvscheck" expansion item takes three arguments. Argument 1 is + expanded first. When the expansion does not yield a SYNTACTICALLY + valid "prvs"-scheme address, the whole "prvscheck" item expands to + the empty string. If
is a "prvs"-encoded address after + expansion, two expansion variables are set up: + + $prvscheck_address Contains the "prvs"-decoded version of + the address from argument 1. + + $prvscheck_keynum Contains the key number extracted from + the "prvs"-address in argument 1. + + These two variables can be used in the expansion code of argument 2 + to retrieve the . The VALIDITY of the "prvs"-signed address + is then checked. The result is stored in yet another expansion + variable: + + $prvscheck_result Contains the result of a "prvscheck" + expansion: Unset (the empty string) for + failure, "1" for success. + + The "prvscheck" expansion expands to the empty string if
+ is not a SYNTACTICALLY valid "prvs"-scheme address. Otherwise, + argument 3 defines what "prvscheck" expands to: If argument 3 + is the empty string, "prvscheck" expands to the decoded version + of the address (no matter if it is CRYPTOGRAPHICALLY valid or not). + If argument 3 expands to a non-empty string, "prvscheck" expands + to that string. + + + Usage example + ------------- + + Macro: + + PRVSCHECK_SQL = ${lookup mysql{SELECT secret FROM batv_prvs WHERE \ + sender='${quote_mysql:$prvscheck_address}'}{$value}} + + RCPT ACL: + + # Bounces: drop unsigned addresses for BATV senders + deny message = This address does not send an unsigned reverse path. + senders = : + recipients = +batv_recipients + + # Bounces: In case of prvs-signed address, check signature. + deny message = Invalid reverse path signature. + senders = : + condition = ${prvscheck {$local_part@$domain}{PRVSCHECK_SQL}{1}} + !condition = $prvscheck_result + + Top-Level Router: + + batv_redirect: + driver = redirect + data = ${prvscheck {$local_part@$domain}{PRVSCHECK_SQL}{}} + + Transport (referenced by router that makes decision if + BATV is applicable): + + external_smtp_batv: + driver = smtp + return_path = ${prvs {$return_path} \ + {${lookup mysql{SELECT \ + secret FROM batv_prvs WHERE \ + sender='${quote_mysql:$sender_address}'} \ + {$value}fail}}} + +PH/04 There are two new options that control the retrying done by the daemon + at startup when it cannot immediately bind a socket (typically because + the socket is already in use). The default values reproduce what were + built-in constants previously: daemon_startup_retries defines the number + of retries after the first failure (default 9); daemon_startup_sleep + defines the length of time to wait between retries (default 30s). + +PH/05 There is now a new ${if condition called "match_ip". It is similar to + match_domain, etc. It must be followed by two argument strings. The first + (after expansion) must be an IP address or an empty string. The second + (after expansion) is a restricted host list that can match only an IP + address, not a host name. For example: + + ${if match_ip{$sender_host_address}{1.2.3.4:5.6.7.8}{...}{...}} + + The specific types of host list item that are permitted in the list are + shown below. Consult the manual section on host lists for further + details. + + . An IP address, optionally with a CIDR mask. + + . A single asterisk matches any IP address. + + . An empty item matches only if the IP address is empty. This could be + useful for testing for a locally submitted message or one from specific + hosts in a single test such as + + ${if match_ip{$sender_host_address}{:4.3.2.1:...}{...}{...}} + + where the first item in the list is the empty string. + + . The item @[] matches any of the local host's interface addresses. + + . Lookups are assumed to be "net-" style lookups, even if "net-" is not + specified. Thus, the following are equivalent: + + ${if match_ip{$sender_host_address}{lsearch;/some/file}... + ${if match_ip{$sender_host_address}{net-lsearch;/some/file}... + + You do need to specify the "net-" prefix if you want to specify a + specific address mask, for example, by using "net24-". + +PH/06 The "+all" debug selector used to set the flags for all possible output; + it is something that people tend to use semi-automatically when + generating debug output for me or for the list. However, by including + "+memory", an awful lot of output that is very rarely of interest was + generated. I have changed this so that "+all" no longer includes + "+memory". However, "-all" still turns everything off. + Version 4.51 ------------