From a159f203b559a406a5489f3ef2a60a61574bbb86 Mon Sep 17 00:00:00 2001
From: Jeremy Harris <jgh146exb@wizmail.org>
Date: Sat, 14 Nov 2015 17:32:29 +0000
Subject: [PATCH 1/1] MySQL: support MySQL config file option group names.  Bug
 1701

---
 doc/doc-docbook/spec.xfpt | 14 +++++++++-----
 doc/doc-txt/ChangeLog     |  2 ++
 src/src/lookups/mysql.c   | 27 ++++++++++++++++++---------
 3 files changed, 29 insertions(+), 14 deletions(-)

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index f505250c8..d7d981ea7 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -7592,13 +7592,17 @@ ${lookup pgsql{servers=master/db/name/pw; UPDATE ...} }
 .section "Special MySQL features" "SECID73"
 For MySQL, an empty host name or the use of &"localhost"& in &%mysql_servers%&
 causes a connection to the server on the local host by means of a Unix domain
-socket. An alternate socket can be specified in parentheses. The full syntax of
-each item in &%mysql_servers%& is:
+socket. An alternate socket can be specified in parentheses.
+.new
+An option group name for MySQL option files can be specified in square brackets;
+the default value is &"exim"&.
+.wen
+The full syntax of each item in &%mysql_servers%& is:
 .display
-<&'hostname'&>::<&'port'&>(<&'socket name'&>)/<&'database'&>/&&&
-  <&'user'&>/<&'password'&>
+<&'hostname'&>::<&'port'&>(<&'socket name'&>)[<&'option group'&>]/&&&
+  <&'database'&>/<&'user'&>/<&'password'&>
 .endd
-Any of the three sub-parts of the first field can be omitted. For normal use on
+Any of the four sub-parts of the first field can be omitted. For normal use on
 the local host it can be left blank or set to just &"localhost"&.
 
 No database need be supplied &-- but if it is absent here, it must be given in
diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index 22ddaa2af..d650fc1c0 100644
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -102,6 +102,8 @@ GF/01 Bug 1715: Fix for race condition in exicyclog, where exim could attempt
       installations where exicyclog is run as root, rather than exim user;
       result is that the running daemon panics and dies.
 
+JH/20 Bug 1701: For MySQL lookups, support MySQL config file option group names.
+
 
 Exim version 4.86
 -----------------
diff --git a/src/src/lookups/mysql.c b/src/src/lookups/mysql.c
index 1ce8831e8..68b04dcc8 100644
--- a/src/src/lookups/mysql.c
+++ b/src/src/lookups/mysql.c
@@ -125,42 +125,50 @@ sdata[0] = server;   /* What's left at the start */
 
 /* See if we have a cached connection to the server */
 
-for (cn = mysql_connections; cn != NULL; cn = cn->next)
-  {
+for (cn = mysql_connections; cn; cn = cn->next)
   if (Ustrcmp(cn->server, server_copy) == 0)
     {
     mysql_handle = cn->handle;
     break;
     }
-  }
 
 /* If no cached connection, we must set one up. Mysql allows for a host name
 and port to be specified. It also allows the name of a Unix socket to be used.
 Unfortunately, this contains slashes, but its use is expected to be rare, so
 the rather cumbersome syntax shouldn't inconvenience too many people. We use
-this:  host:port(socket)  where all the parts are optional. */
+this:  host:port(socket)[group]  where all the parts are optional.
+The "group" parameter specifies an option group from a MySQL option file. */
 
-if (cn == NULL)
+if (!cn)
   {
   uschar *p;
   uschar *socket = NULL;
   int port = 0;
+  uschar *group = US"exim";
+
+  if ((p = Ustrchr(sdata[0], '[')))
+    {
+    *p++ = 0;
+    group = p;
+    while (*p && *p != ']') p++;
+    *p = 0;
+    }
 
-  if ((p = Ustrchr(sdata[0], '(')) != NULL)
+  if ((p = Ustrchr(sdata[0], '(')))
     {
     *p++ = 0;
     socket = p;
-    while (*p != 0 && *p != ')') p++;
+    while (*p && *p != ')') p++;
     *p = 0;
     }
 
-  if ((p = Ustrchr(sdata[0], ':')) != NULL)
+  if ((p = Ustrchr(sdata[0], ':')))
     {
     *p++ = 0;
     port = Uatoi(p);
     }
 
-  if (Ustrchr(sdata[0], '/') != NULL)
+  if (Ustrchr(sdata[0], '/'))
     {
     *errmsg = string_sprintf("unexpected slash in MySQL server hostname: %s",
       sdata[0]);
@@ -181,6 +189,7 @@ if (cn == NULL)
 
   mysql_handle = store_get(sizeof(MYSQL));
   mysql_init(mysql_handle);
+  mysql_options(mysql_handle, MYSQL_READ_DEFAULT_GROUP, CS group);
   if (mysql_real_connect(mysql_handle,
       /*  host        user         passwd     database */
       CS sdata[0], CS sdata[2], CS sdata[3], CS sdata[1],
-- 
2.25.1