SQL-specific auth functions.

+/* GNU mailutils - a suite of utilities for electronic mail
+   Copyright (C) 2002 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <pwd.h>
+#ifdef HAVE_SHADOW_H
+# include <shadow.h>
+#endif
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif
+
+#include <mailutils/list.h>
+#include <mailutils/iterator.h>
+#include <mailutils/mailbox.h>
+#include <mailutils/argp.h>
+#include <mailutils/mu_auth.h>
+
+#ifdef HAVE_MYSQL
+# include "../MySql/MySql.h"
+#endif
+
+/* SQL */
+/* FIXME: Underlying library needs rewriting */
+
+int
+mu_auth_sql_by_name (void *return_data, void *key,
+		     void *unused_func_data, void *unused_call_data)
+{
+  if (!key)
+    {
+      errno = EINVAL;
+      return 1;
+    }
+#ifdef HAVE_MYSQL
+  return mu_auth_system (return_data, getMpwnam (key));
+#else
+  errno = ENOSYS;
+  return 1;
+#endif
+}
+
+int
+mu_auth_sql_by_uid (void *return_data, void *key,
+		    void *unused_func_data, void *unused_call_data)
+{
+  if (!key)
+    {
+      errno = EINVAL;
+      return 1;
+    }
+
+#ifdef HAVE_MYSQL
+  return mu_auth_system (return_data, getMpwuid (key));
+#else
+  errno = ENOSYS;
+  return 1;
+#endif
+}
+
+#ifdef HAVE_MYSQL
+# define ARG_SQL_GETPWNAM 1
+# define ARG_SQL_GETPWUID 2
+# define ARG_SQL_GETPASS 3
+# define ARG_SQL_HOST 4
+# define ARG_SQL_USER 5
+# define ARG_SQL_PASSWD 6
+# define ARG_SQL_DB 7
+# define ARG_SQL_PORT 8
+
+static struct argp_option mu_sql_argp_option[] = {
+  {"sql-getpwnam", ARG_SQL_GETPWNAM, "QUERY", 0,
+   "SQL query to retrieve a passwd entry based on username", 0},
+  {"sql-getpwuid", ARG_SQL_GETPWUID, "QUERY", 0,
+   "SQL query to retrieve a passwd entry based on UID", 0},
+  {"sql-getpass", ARG_SQL_GETPASS, "QUERY", 0,
+   "SQL query to retrieve a password from the database", 0},
+  {"sql-host", ARG_SQL_HOST, "HOSTNAME", 0,
+   "Name or IP of MySQL server to connect to", 0},
+  {"sql-user", ARG_SQL_USER, "NAME", 0,
+   "SQL user name", 0},
+  {"sql-passwd", ARG_SQL_PASSWD, "STRING", 0,
+   "SQL connection password", 0},
+  {"sql-db", ARG_SQL_DB, "STRING", 0,
+   "Name of the database to connect to", 0},
+  {"sql-port", ARG_SQL_PORT, "NUMBER", 0,
+   "Port to use", 0},
+  { NULL,      0, NULL, 0, NULL, 0 }
+};
+
+char *sql_getpwnam_query;
+char *sql_getpass_query;
+char *sql_getpwuid_query;
+char *sql_host = MHOST;
+char *sql_user = MUSER;
+char *sql_passwd = MPASS;
+char *sql_db = MDB;
+char *sql_socket = MSOCKET;
+int  sql_port = MPORT;
+
+static error_t
+mu_sql_argp_parser (int key, char *arg, struct argp_state *state)
+{
+  switch (key)
+    {
+    case ARG_SQL_GETPWNAM:
+      sql_getpwnam_query = arg;
+      break;
+
+    case ARG_SQL_GETPWUID:
+      sql_getpwuid_query = arg;
+      break;
+
+    case ARG_SQL_GETPASS:
+      sql_getpass_query = arg;
+      break;
+
+    case ARG_SQL_HOST:
+      sql_host = arg;
+      break;
+
+    case ARG_SQL_USER:
+      sql_user = arg;
+      break;
+
+    case ARG_SQL_PASSWD:
+      sql_passwd = arg;
+      break;
+
+    case ARG_SQL_DB:
+      sql_db = arg;
+      break;
+
+    case ARG_SQL_PORT:
+      sql_port = strtoul (arg, NULL, 0);
+      if (sql_port == 0)
+	{
+	  sql_host = NULL;
+	  sql_socket = arg;
+	}
+      break;
+
+    default:
+      return ARGP_ERR_UNKNOWN;
+    }
+  return 0;
+}
+
+struct argp mu_sql_argp = {
+  mu_sql_argp_option,
+  mu_sql_argp_parser,
+};
+
+#endif
+
+struct mu_auth_module mu_auth_sql_module = {
+  "sql",
+#ifdef HAVE_MYSQL
+  &mu_sql_argp,
+#else
+  NULL,
+#endif
+  mu_auth_nosupport,
+  NULL,
+  mu_auth_sql_by_name,
+  NULL,
+  mu_auth_sql_by_uid,
+  NULL
+};
+