1 files changed, 65 insertions, 0 deletions
diff --git a/source/lib/util_smbd.c b/source/lib/util_smbd.c
new file mode 100644
index 00000000000..071f20b4162
--- /dev/null
+++ b/source/lib/util_smbd.c
@@ -0,0 +1,65 @@
+/*
+   Unix SMB/CIFS implementation.
+   Samba utility functions, used in smbd only
+   Copyright (C) Andrew Tridgell 2002
+
+   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 of the License, 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.
+*/
+
+#include "includes.h"
+
+/* 
+   This function requires sys_getgrouplist - which is only
+   available in smbd due to it's use of become_root() in a 
+   legacy systems hack.
+*/
+
+/*
+  return a full list of groups for a user
+
+  returns the number of groups the user is a member of. The return will include the
+  users primary group.
+
+  remember to free the resulting gid_t array
+
+  NOTE! uses become_root() to gain correct priviages on systems
+  that lack a native getgroups() call (uses initgroups and getgroups)
+*/
+int getgroups_user(const char *user, gid_t **groups)
+{
+	struct passwd *pwd;
+	int ngrp, max_grp;
+
+	pwd = getpwnam_alloc(user);
+	if (!pwd) return -1;
+
+	max_grp = groups_max();
+	(*groups) = (gid_t *)malloc(sizeof(gid_t) * max_grp);
+	if (! *groups) {
+		passwd_free(&pwd);
+		errno = ENOMEM;
+		return -1;
+	}
+
+	ngrp = sys_getgrouplist(user, pwd->pw_gid, *groups, &max_grp);
+	if (ngrp <= 0) {
+		passwd_free(&pwd);
+		free(*groups);
+		return ngrp;
+	}
+
+	passwd_free(&pwd);
+	return ngrp;
+}