Save/restore $acl_arg1 ... across acl calls, making them local variables.

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

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 5961c4bd40106088ff0ca55a2cca5b374a979e2e..34518d3c490dd24c43802727da4c8397a13e2be0 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -8791,12 +8791,12 @@ arguments are assigned to the variables &$acl_arg1$& to &$acl_arg9$& in order.
 Any unused are made empty.  The variable &$acl_narg$& is set to the number of
 arguments.  The named ACL (see chapter &<<CHAPACL>>&) is called
 and may use the variables; if another acl expansion is used the values
-are overwritten.  If the ACL sets
+are restored after it returns.  If the ACL sets
 a value using a "message =" modifier and returns accept or deny, the value becomes
 the result of the expansion.
-If no message was set and the ACL returned accept or deny
-the value is an empty string.
-If the ACL returned defer the result is a forced-fail.  Otherwise the expansion fails.
+If no message is set and the ACL returns accept or deny
+the expansion result is an empty string.
+If the ACL returns defer the result is a forced-fail.  Otherwise the expansion fails.
 
 
 .vitem "&*${dlfunc{*&<&'file'&>&*}{*&<&'function'&>&*}{*&<&'arg'&>&*}&&&
@@ -10107,7 +10107,7 @@ arguments are assigned to the variables &$acl_arg1$& to &$acl_arg9$& in order.
 Any unused are made empty.  The variable &$acl_narg$& is set to the number of
 arguments.  The named ACL (see chapter &<<CHAPACL>>&) is called
 and may use the variables; if another acl expansion is used the values
-are overwritten.  If the ACL sets
+are restored after it returns.  If the ACL sets
 a value using a "message =" modifier the variable $value becomes
 the result of the expansion, otherwise it is empty.
 If the ACL returns accept the condition is true; if deny, false.
@@ -11063,6 +11063,12 @@ inserting the message header line with the given name. Note that the name must
 be terminated by colon or white space, because it may contain a wide variety of
 characters. Note also that braces must &'not'& be used.
 
+.vitem &$headers_added$&
+.vindex "&$headers_added$&"
+Within an ACL this variable contains the headers added so far by
+the ACL modifier add_header (section &<<SECTaddheadacl>>&).
+The headers are a newline-separated list.
+
 .vitem &$home$&
 .vindex "&$home$&"
 When the &%check_local_user%& option is set for a router, the user's home
@@ -13093,6 +13099,8 @@ Those options that undergo string expansion before use are marked with
 .option accept_8bitmime main boolean true
 .cindex "8BITMIME"
 .cindex "8-bit characters"
+.cindex "log" "selectors"
+.cindex "log" "8BITMIME"
 This option causes Exim to send 8BITMIME in its response to an SMTP
 EHLO command, and to accept the BODY= parameter on MAIL commands.
 However, though Exim is 8-bit clean, it is not a protocol converter, and it
@@ -13106,6 +13114,11 @@ A more detailed analysis of the issues is provided by Dan Bernstein:
 &url(http://cr.yp.to/smtp/8bitmime.html)
 .endd
 
+To log received 8BITMIME status use
+.code
+log_selector = +8bitmime
+.endd
+
 .option acl_not_smtp main string&!! unset
 .cindex "&ACL;" "for non-SMTP messages"
 .cindex "non-SMTP messages" "ACLs for"
@@ -27340,7 +27353,9 @@ message is rejected after DATA or by the non-SMTP ACL, all added header lines
 are included in the entry that is written to the reject log.
 
 .cindex "header lines" "added; visibility of"
-Header lines are not visible in string expansions until they are added to the
+Header lines are not visible in string expansions
+of message headers
+until they are added to the
 message. It follows that header lines defined in the MAIL, RCPT, and predata
 ACLs are not visible until the DATA ACL and MIME ACLs are run. Similarly,
 header lines that are added by the DATA or MIME ACLs are not visible in those
@@ -27349,6 +27364,8 @@ passing data between (for example) the MAIL and RCPT ACLs. If you want to do
 this, you can use ACL variables, as described in section
 &<<SECTaclvariables>>&.
 
+The list of headers yet to be added is given by the &%$headers_added%& variable.
+
 The &%add_header%& modifier acts immediately as it is encountered during the
 processing of an ACL. Notice the difference between these two cases:
 .display
@@ -27501,8 +27518,10 @@ condition false. This means that further processing of the &%warn%& verb
 ceases, but processing of the ACL continues.
 
 If the argument is a named ACL, up to nine space-separated optional values
-can be appended; they appear in $acl_arg1 to $acl_arg9, and $acl_narg is set
-to the count of values.  The name and values are expanded separately.
+can be appended; they appear within the called ACL in $acl_arg1 to $acl_arg9,
+and $acl_narg is set to the count of values.
+Previous values of these variables are restored after the call returns.
+The name and values are expanded separately.
 
 If the nested &%acl%& returns &"drop"& and the outer condition denies access,
 the connection is dropped. If it returns &"discard"&, the verb must be
@@ -33814,6 +33833,7 @@ log_selector = +arguments -retry_defer
 The list of optional log items is in the following table, with the default
 selection marked by asterisks:
 .display
+&` 8bitmime                   `&  received 8BITMIME status
 &`*acl_warn_skipped           `&  skipped &%warn%& statement in ACL
 &` address_rewrite            `&  address rewriting
 &` all_parents                `&  all parents in => lines
@@ -33861,6 +33881,14 @@ selection marked by asterisks:
 More details on each of these items follows:
 
 .ilist
+.cindex "8BITMIME"
+.cindex "log" "8BITMIME"
+&%8bitmime%&: This causes Exim to log any 8BITMIME status of received messages,
+which may help in tracking down interoperability issues with ancient MTAs
+that are not 8bit clean.  This is added to the &"<="& line, tagged with
+&`M8S=`& and a value of &`0`&, &`7`& or &`8`&, corresponding to "not given",
+&`7BIT`& and &`8BITMIME`& respectively.
+.next
 .cindex "&%warn%& ACL verb" "log when skipping"
 &%acl_warn_skipped%&: When an ACL &%warn%& statement is skipped because one of
 its conditions cannot be evaluated, a log line to this effect is written if