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/* APN contexts */
/* (C) 2009-2015 by Harald Welte <laforge@gnumonks.org>
* (C) 2010 by On-Waves
* (C) 2019 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <string.h>
#include <talloc.h>
#include <osmocom/sgsn/apn.h>
#include <osmocom/sgsn/sgsn.h>
static struct apn_ctx *sgsn_apn_ctx_alloc(const char *ap_name, const char *imsi_prefix)
{
struct apn_ctx *actx;
actx = talloc_zero(sgsn, struct apn_ctx);
if (!actx)
return NULL;
actx->name = talloc_strdup(actx, ap_name);
actx->imsi_prefix = talloc_strdup(actx, imsi_prefix);
llist_add_tail(&actx->list, &sgsn->apn_list);
return actx;
}
void sgsn_apn_ctx_free(struct apn_ctx *actx)
{
llist_del(&actx->list);
talloc_free(actx);
}
struct apn_ctx *sgsn_apn_ctx_match(const char *name, const char *imsi)
{
struct apn_ctx *actx;
struct apn_ctx *found_actx = NULL;
size_t imsi_prio = 0;
size_t name_prio = 0;
size_t name_req_len = strlen(name);
llist_for_each_entry(actx, &sgsn->apn_list, list) {
size_t name_ref_len, imsi_ref_len;
const char *name_ref_start, *name_match_start;
imsi_ref_len = strlen(actx->imsi_prefix);
if (strncmp(actx->imsi_prefix, imsi, imsi_ref_len) != 0)
continue;
if (imsi_ref_len < imsi_prio)
continue;
/* IMSI matches */
name_ref_start = &actx->name[0];
if (name_ref_start[0] == '*') {
/* Suffix match */
name_ref_start += 1;
name_ref_len = strlen(name_ref_start);
if (name_ref_len > name_req_len)
continue;
} else {
name_ref_len = strlen(name_ref_start);
if (name_ref_len != name_req_len)
continue;
}
name_match_start = name + (name_req_len - name_ref_len);
if (strcasecmp(name_match_start, name_ref_start) != 0)
continue;
/* IMSI and name match */
if (imsi_ref_len == imsi_prio && name_ref_len < name_prio)
/* Lower priority, skip */
continue;
imsi_prio = imsi_ref_len;
name_prio = name_ref_len;
found_actx = actx;
}
return found_actx;
}
struct apn_ctx *sgsn_apn_ctx_by_name(const char *name, const char *imsi_prefix)
{
struct apn_ctx *actx;
llist_for_each_entry(actx, &sgsn->apn_list, list) {
if (strcasecmp(name, actx->name) == 0 &&
strcasecmp(imsi_prefix, actx->imsi_prefix) == 0)
return actx;
}
return NULL;
}
struct apn_ctx *sgsn_apn_ctx_find_alloc(const char *name, const char *imsi_prefix)
{
struct apn_ctx *actx;
actx = sgsn_apn_ctx_by_name(name, imsi_prefix);
if (!actx)
actx = sgsn_apn_ctx_alloc(name, imsi_prefix);
return actx;
}
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