From 9cd1e7417e76c98094a502131af779145a77c7b9 Mon Sep 17 00:00:00 2001 From: Neels Hofmeyr Date: Wed, 4 Oct 2017 03:15:47 +0200 Subject: add osmo_imsi_str_valid() and osmo_msisdn_str_valid() Add GSM23003_IMSI_MIN_DIGITS definition. Add regression test gsm23003_test.c to test the two new functions. Will be used by OsmoHLR to validate VTY and CTRL input. Change-Id: I1e94f5b0717b947d2a7a7d36bacdf04a75cb3522 --- src/gsm/gsm23003.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 src/gsm/gsm23003.c (limited to 'src/gsm/gsm23003.c') diff --git a/src/gsm/gsm23003.c b/src/gsm/gsm23003.c new file mode 100644 index 00000000..004e20ff --- /dev/null +++ b/src/gsm/gsm23003.c @@ -0,0 +1,65 @@ +/*! \file gsm23003.c + * Utility function implementations related to 3GPP TS 23.003 */ +/* + * (C) 2017 sysmocom s.f.m.c. GmbH + * All Rights Reserved + * + * Author: Neels Hofmeyr + * + * 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., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#include + +#include +#include + +static bool is_n_digits(const char *str, int min_digits, int max_digits) +{ + int len; + /* Use unsigned char * to avoid a compiler warning of + * "error: array subscript has type 'char' [-Werror=char-subscripts]" */ + const unsigned char *pos = (const unsigned char *)str; + for (len = 0; *pos && len < max_digits; len++, pos++) + if (!isdigit(*pos)) + return false; + if (len < min_digits) + return false; + /* With not too many digits, we should have reached *str == nul */ + if (*pos) + return false; + return true; +} + +/*! Determine whether the given IMSI is valid according to 3GPP TS 23.003. + * \param imsi IMSI digits in ASCII string representation. + * \returns true when the IMSI is valid, false for invalid characters or number + * of digits. + */ +bool osmo_imsi_str_valid(const char *imsi) +{ + return is_n_digits(imsi, GSM23003_IMSI_MIN_DIGITS, GSM23003_IMSI_MAX_DIGITS); +} + +/*! Determine whether the given MSISDN is valid according to 3GPP TS 23.003. + * \param msisdn MSISDN digits in ASCII string representation. + * \returns true when the MSISDN is valid, false for invalid characters or number + * of digits. + */ +bool osmo_msisdn_str_valid(const char *msisdn) +{ + return is_n_digits(msisdn, 1, 15); +} -- cgit v1.2.3