SPF multiple strings join on "".

Patch from Janne Snabb.

3 files changed, 17 insertions, 4 deletions

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index b650fc39f..c4c181ef1 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -6790,14 +6790,16 @@ white space is ignored.
 .cindex "TXT record" "in &(dnsdb)& lookup"
 .cindex "SPF record" "in &(dnsdb)& lookup"
 .new
-For TXT and SPF records with multiple items of data, only the first item is returned,
+For TXT records with multiple items of data, only the first item is returned,
 unless a separator for them is specified using a comma after the separator
-character followed immediately by the TXT/SPF record item separator. To concatenate
-items without a separator, use a semicolon instead.
+character followed immediately by the TXT record item separator. To concatenate
+items without a separator, use a semicolon instead. For SPF records the
+default behaviour is to concatenate multiple items without using a separator.
 .wen
 .code
 ${lookup dnsdb{>\n,: txt=a.b.example}}
 ${lookup dnsdb{>\n; txt=a.b.example}}
+${lookup dnsdb{spf=example.org}}
 .endd
 It is permitted to specify a space as the separator character. Further
 white space is ignored.
diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index bf4ddf1af..b3815cd45 100644
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -113,6 +113,8 @@ PP/25 Revamped GnuTLS support, passing tls_require_ciphers to
 PP/26 Added EXPERIMENTAL_OCSP for OpenSSL.
 
 PP/27 Applied dnsdb SPF support patch from Janne Snabb.
+      Applied second patch from Janne, implementing suggestion to default
+      multiple-strings-in-record handling to match SPF spec.
 
 JH/04 Added expansion variable $tod_epoch_l for a higher-precision time.
 
diff --git a/src/src/lookups/dnsdb.c b/src/src/lookups/dnsdb.c
index 3fd9f981b..be090cf78 100644
--- a/src/src/lookups/dnsdb.c
+++ b/src/src/lookups/dnsdb.c
@@ -96,7 +96,8 @@ separator is newline.
 character used for multiple items of text in "TXT" records. Alternatively,
 if the next character is ';' then these multiple items are concatenated with
 no separator. With neither of these options specified, only the first item
-is output.
+is output.  Similarly for "SPF" records, but the default for joining multiple
+items in one SPF record is the empty string, for direct concatenation.
 
 (c) If the next sequence of characters is 'defer_FOO' followed by a comma,
 the defer behaviour is set to FOO. The possible behaviours are: 'strict', where
@@ -163,6 +164,14 @@ if (*keystring == '>')
   while (isspace(*keystring)) keystring++;
   }
 
+/* SPF strings should be concatenated without a separator, thus make
+it the default if not defined (see RFC 4408 section 3.1.3).
+Multiple SPF records are forbidden (section 3.1.2) but are currently
+not handled specially, thus they are concatenated with \n by default. */
+
+if (type == T_SPF && outsep2 == NULL)
+  outsep2 = US"";
+
 /* Check for a defer behaviour keyword. */
 
 if (strncmpic(keystring, US"defer_", 6) == 0)