2017-11-12 16:00:26 +00:00
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/*! \file apn.c
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*
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* (C) 2014 by Harald Welte <laforge@gnumonks.org>
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* (C) 2015,2017 by sysmocom - s.f.m.c. GmbH
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* All Rights Reserved.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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2017-06-20 02:35:06 +00:00
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2014-10-01 08:18:11 +00:00
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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2019-03-18 17:38:47 +00:00
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#include <talloc.h>
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2014-10-01 08:18:11 +00:00
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#include <osmocom/gsm/apn.h>
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#define APN_OI_GPRS_FMT "mnc%03u.mcc%03u.gprs"
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#define APN_GPRS_FMT "%s.mnc%03u.mcc%03u.gprs"
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static char apn_strbuf[APN_MAXLEN+1];
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2019-03-18 17:27:00 +00:00
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char *osmo_apn_qualify_buf(char *buf, size_t buf_len, unsigned int mcc, unsigned int mnc, const char *ni)
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2014-10-01 08:18:11 +00:00
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{
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2019-03-18 17:27:00 +00:00
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snprintf(buf, buf_len-1, APN_GPRS_FMT, ni, mnc, mcc);
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buf[buf_len-1] = '\0';
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2014-10-01 08:18:11 +00:00
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2019-03-18 17:27:00 +00:00
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return buf;
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2014-10-01 08:18:11 +00:00
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}
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2019-03-18 17:27:00 +00:00
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char *osmo_apn_qualify(unsigned int mcc, unsigned int mnc, const char *ni)
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{
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return osmo_apn_qualify_buf(apn_strbuf, sizeof(apn_strbuf), mcc, mnc, ni);
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}
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2019-03-18 17:38:47 +00:00
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char *osmo_apn_qualify_c(const void *ctx, unsigned int mcc, unsigned int mnc, const char *ni)
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{
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char *buf = talloc_size(ctx, APN_MAXLEN);
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if (!buf)
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return NULL;
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return osmo_apn_qualify_buf(buf, APN_MAXLEN, mcc, mnc, ni);
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}
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2019-03-18 17:27:00 +00:00
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char *osmo_apn_qualify_from_imsi_buf(char *buf, size_t buf_len, const char *imsi,
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const char *ni, int have_3dig_mnc)
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2014-10-01 08:18:11 +00:00
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{
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char cbuf[3+1], nbuf[3+1];
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strncpy(cbuf, imsi, 3);
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cbuf[3] = '\0';
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if (have_3dig_mnc) {
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strncpy(nbuf, imsi+3, 3);
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nbuf[3] = '\0';
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} else {
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strncpy(nbuf, imsi+3, 2);
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nbuf[2] = '\0';
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}
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2019-03-18 17:27:00 +00:00
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return osmo_apn_qualify_buf(buf, buf_len, atoi(cbuf), atoi(nbuf), ni);
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}
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char *osmo_apn_qualify_from_imsi(const char *imsi,
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const char *ni, int have_3dig_mnc)
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{
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return osmo_apn_qualify_from_imsi_buf(apn_strbuf, sizeof(apn_strbuf), imsi, ni, have_3dig_mnc);
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2014-10-01 08:18:11 +00:00
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}
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2015-11-17 07:42:05 +00:00
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2019-03-18 17:38:47 +00:00
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char *osmo_apn_qualify_from_imsi_c(const void *ctx, const char *imsi, const char *ni, int have_3dig_mnc)
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{
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char *buf = talloc_size(ctx, APN_MAXLEN);
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if (!buf)
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return NULL;
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return osmo_apn_qualify_from_imsi_buf(buf, APN_MAXLEN, imsi, ni, have_3dig_mnc);
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}
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2015-11-17 07:42:05 +00:00
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/**
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* Convert an encoded APN into a dot-separated string.
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*
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* \param out_str the destination buffer (size must be >= max(app_enc_len,1))
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* \param apn_enc the encoded APN
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* \param apn_enc_len the length of the encoded APN
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*
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* \returns out_str on success and NULL otherwise
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*/
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2018-12-07 10:00:59 +00:00
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char *osmo_apn_to_str(char *out_str, const uint8_t *apn_enc, size_t apn_enc_len)
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2015-11-17 07:42:05 +00:00
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{
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char *str = out_str;
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size_t rest_chars = apn_enc_len;
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2017-10-19 13:50:44 +00:00
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if (!apn_enc)
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return NULL;
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2015-11-17 07:42:05 +00:00
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while (rest_chars > 0 && apn_enc[0]) {
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size_t label_size = apn_enc[0];
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if (label_size + 1 > rest_chars)
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return NULL;
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memmove(str, apn_enc + 1, label_size);
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str += label_size;
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rest_chars -= label_size + 1;
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apn_enc += label_size + 1;
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if (rest_chars)
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*(str++) = '.';
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}
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str[0] = '\0';
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return out_str;
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}
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/**
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* Convert a dot-separated string into an encoded APN.
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*
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* \param apn_enc the encoded APN
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* \param max_apn_enc_len the size of the apn_enc buffer
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* \param str the source string
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*
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* \returns out_str on success and NULL otherwise
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*/
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int osmo_apn_from_str(uint8_t *apn_enc, size_t max_apn_enc_len, const char *str)
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{
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uint8_t *last_len_field;
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int len;
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/* Can we even write the length field to the output? */
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if (max_apn_enc_len == 0)
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return -1;
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/* Remember where we need to put the length once we know it */
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last_len_field = apn_enc;
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len = 1;
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apn_enc += 1;
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while (str[0]) {
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if (len >= max_apn_enc_len)
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return -1;
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if (str[0] == '.') {
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*last_len_field = (apn_enc - last_len_field) - 1;
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last_len_field = apn_enc;
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} else {
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*apn_enc = str[0];
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}
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apn_enc += 1;
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str += 1;
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len += 1;
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}
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*last_len_field = (apn_enc - last_len_field) - 1;
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return len;
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}
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