Docs: more notes for local_scan/dlfunc

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

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index abd15d452dbad0b940cd4a8f8666d01219e3ca1e..8be9b7121424e62d151ac73780f8bc8ecf26aac8 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -4383,6 +4383,17 @@ written. When &%-oX%& is used with &%-bd%&, or when &%-q%& with a time is used
 without &%-bd%&, this is the only way of causing Exim to write a pid file,
 because in those cases, the normal pid file is not used.
 
+.new
+.vitem &%-oPX%&
+.oindex "&%-oPX%&"
+.cindex "pid (process id)" "of daemon"
+.cindex "daemon" "process id (pid)"
+This option is not intended for general use.
+The daemon uses it when terminating due to a SIGTEM, possibly in
+combination with &%-oP%&&~<&'path'&>.
+It causes the pid file to be removed.
+.wen
+
 .vitem &%-or%&&~<&'time'&>
 .oindex "&%-or%&"
 .cindex "timeout" "for non-SMTP input"
@@ -15111,15 +15122,22 @@ etc. are ignored. If IP literals are enabled, the &(ipliteral)& router declines
 to handle IPv6 literal addresses.
 
 
-.option dkim_verify_hashes main "string list" "sha256 : sha512 : sha1"
+.new
+.option dkim_verify_hashes main "string list" "sha256 : sha512"
 .cindex DKIM "selecting signature algorithms"
 This option gives a list of hash types which are acceptable in signatures,
+.wen
 and an order of processing.
 Signatures with algorithms not in the list will be ignored.
 
-Note that the presence of sha1 violates RFC 8301.
-Signatures using the rsa-sha1 are however (as of writing) still common.
-The default inclusion of sha1 may be dropped in a future release.
+Acceptable values include:
+.code
+sha1
+sha256
+sha512
+.endd
+
+Note that the acceptance of sha1 violates RFC 8301.
 
 .option dkim_verify_keytypes main "string list" "ed25519 : rsa"
 This option gives a list of key types which are acceptable in signatures,
@@ -24870,6 +24888,9 @@ unauthenticated. See also &%hosts_require_auth%&, and chapter
 .cindex "RFC 3030" "CHUNKING"
 This option provides a list of servers to which, provided they announce
 CHUNKING support, Exim will attempt to use BDAT commands rather than DATA.
+.new
+Unless DKIM signing is being done,
+.wen
 BDAT will not be used in conjunction with a transport filter.
 
 .option hosts_try_dane smtp "host list&!!" *
@@ -27415,9 +27436,11 @@ This should have meant that certificate identity and verification becomes a
 non-issue, as a man-in-the-middle attack will cause the correct client and
 server to see different identifiers and authentication will fail.
 
-This is currently only supported when using the GnuTLS library.  This is
+.new
+This is
 only usable by mechanisms which support "channel binding"; at time of
 writing, that's the SCRAM family.
+.wen
 
 This defaults off to ensure smooth upgrade across Exim releases, in case
 this option causes some clients to start failing.  Some future release
@@ -30351,6 +30374,13 @@ This control turns off DKIM verification processing entirely.  For details on
 the operation and configuration of DKIM, see section &<<SECDKIM>>&.
 
 
+.vitem &*control&~=&~dmarc_disable_verify*&
+.cindex "disable DMARC verify"
+.cindex "DMARC" "disable verify"
+This control turns off DMARC verification processing entirely.  For details on
+the operation and configuration of DMARC, see section &<<SECDMARC>>&.
+
+
 .vitem &*control&~=&~dscp/*&<&'value'&>
 .cindex "&ACL;" "setting DSCP value"
 .cindex "DSCP" "inbound"
@@ -33618,7 +33648,12 @@ directory, so you might set
 HAVE_LOCAL_SCAN=yes
 LOCAL_SCAN_SOURCE=Local/local_scan.c
 .endd
-for example. The function must be called &[local_scan()]&. It is called by
+for example. The function must be called &[local_scan()]&;
+.new
+the source file(s) for it should first #define LOCAL_SCAN
+and then #include "local_scan.h".
+.wen
+It is called by
 Exim after it has received a message, when the success return code is about to
 be sent. This is after all the ACLs have been run. The return code from your
 function controls whether the message is actually accepted or not. There is a
@@ -34297,12 +34332,18 @@ dropping of a TCP/IP connection), you can call &'smtp_fflush()'&, which has no
 arguments. It flushes the output stream, and returns a non-zero value if there
 is an error.
 
-.vitem &*void&~*store_get(int)*&
+.new
+.vitem &*void&~*store_get(int,BOOL)*&
 This function accesses Exim's internal store (memory) manager. It gets a new
-chunk of memory whose size is given by the argument. Exim bombs out if it ever
+chunk of memory whose size is given by the first argument.
+The second argument should be given as TRUE if the memory will be used for
+data possibly coming from an attacker (eg. the message content),
+FALSE if it is locally-sourced.
+Exim bombs out if it ever
 runs out of memory. See the next section for a discussion of memory handling.
+.wen
 
-.vitem &*void&~*store_get_perm(int)*&
+.vitem &*void&~*store_get_perm(int,BOOL)*&
 This function is like &'store_get()'&, but it always gets memory from the
 permanent pool. See the next section for a discussion of memory handling.