From dd5702d696b9ab5a5b3939d660658b7f0e6694ed Mon Sep 17 00:00:00 2001 From: Denis Vlasenko Date: Wed, 19 Mar 2008 23:15:55 +0000 Subject: [PATCH] ...and actually adding new file now... --- libbb/die_if_bad_username.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 libbb/die_if_bad_username.c diff --git a/libbb/die_if_bad_username.c b/libbb/die_if_bad_username.c new file mode 100644 index 000000000..251b1f06c --- /dev/null +++ b/libbb/die_if_bad_username.c @@ -0,0 +1,34 @@ +/* vi: set sw=4 ts=4: */ +/* + * Ckeck user and group names for illegal characters + * + * Copyright (C) 2008 Tito Ragusa + * + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + */ + +#include "libbb.h" + +/* To avoid problems, the username should consist only of + * letters, digits, underscores, periods, at signs and dashes, + * and not start with a dash (as defined by IEEE Std 1003.1-2001). + * For compatibility with Samba machine accounts $ is also supported + * at the end of the username. + */ + +void die_if_bad_username(const char *name) +{ + int i = 0; + + do { + if (!isalnum(*name) + && !(*name == '_') + && !(*name == '.') + && !(*name == '@') + && !(*name == '-' && i) + && !(*name == '$' && !*(name + 1)) + ) + bb_error_msg_and_die("illegal character '%c'", *name); + i++; + } while (*++name); +} -- 2.25.1