Pau Espin Pedrol | ffd6e37 | 2023-01-05 17:45:25 +0100 | [diff] [blame] | 1 | /* APN contexts */ |
| 2 | |
| 3 | /* (C) 2009-2015 by Harald Welte <laforge@gnumonks.org> |
| 4 | * (C) 2010 by On-Waves |
| 5 | * (C) 2019 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| 6 | * |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU Affero General Public License as published by |
| 11 | * the Free Software Foundation; either version 3 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU Affero General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Affero General Public License |
| 20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <string.h> |
| 25 | #include <talloc.h> |
| 26 | |
| 27 | #include <osmocom/sgsn/apn.h> |
Pau Espin Pedrol | fd4d435 | 2023-01-05 19:37:05 +0100 | [diff] [blame] | 28 | #include <osmocom/sgsn/sgsn.h> |
Pau Espin Pedrol | ffd6e37 | 2023-01-05 17:45:25 +0100 | [diff] [blame] | 29 | |
Pau Espin Pedrol | ffd6e37 | 2023-01-05 17:45:25 +0100 | [diff] [blame] | 30 | static struct apn_ctx *sgsn_apn_ctx_alloc(const char *ap_name, const char *imsi_prefix) |
| 31 | { |
| 32 | struct apn_ctx *actx; |
| 33 | |
Pau Espin Pedrol | fd4d435 | 2023-01-05 19:37:05 +0100 | [diff] [blame] | 34 | actx = talloc_zero(sgsn, struct apn_ctx); |
Pau Espin Pedrol | ffd6e37 | 2023-01-05 17:45:25 +0100 | [diff] [blame] | 35 | if (!actx) |
| 36 | return NULL; |
| 37 | actx->name = talloc_strdup(actx, ap_name); |
| 38 | actx->imsi_prefix = talloc_strdup(actx, imsi_prefix); |
| 39 | |
Pau Espin Pedrol | fd4d435 | 2023-01-05 19:37:05 +0100 | [diff] [blame] | 40 | llist_add_tail(&actx->list, &sgsn->apn_list); |
Pau Espin Pedrol | ffd6e37 | 2023-01-05 17:45:25 +0100 | [diff] [blame] | 41 | |
| 42 | return actx; |
| 43 | } |
| 44 | |
| 45 | void sgsn_apn_ctx_free(struct apn_ctx *actx) |
| 46 | { |
| 47 | llist_del(&actx->list); |
| 48 | talloc_free(actx); |
| 49 | } |
| 50 | |
| 51 | struct apn_ctx *sgsn_apn_ctx_match(const char *name, const char *imsi) |
| 52 | { |
| 53 | struct apn_ctx *actx; |
| 54 | struct apn_ctx *found_actx = NULL; |
| 55 | size_t imsi_prio = 0; |
| 56 | size_t name_prio = 0; |
| 57 | size_t name_req_len = strlen(name); |
| 58 | |
Pau Espin Pedrol | fd4d435 | 2023-01-05 19:37:05 +0100 | [diff] [blame] | 59 | llist_for_each_entry(actx, &sgsn->apn_list, list) { |
Pau Espin Pedrol | ffd6e37 | 2023-01-05 17:45:25 +0100 | [diff] [blame] | 60 | size_t name_ref_len, imsi_ref_len; |
| 61 | const char *name_ref_start, *name_match_start; |
| 62 | |
| 63 | imsi_ref_len = strlen(actx->imsi_prefix); |
| 64 | if (strncmp(actx->imsi_prefix, imsi, imsi_ref_len) != 0) |
| 65 | continue; |
| 66 | |
| 67 | if (imsi_ref_len < imsi_prio) |
| 68 | continue; |
| 69 | |
| 70 | /* IMSI matches */ |
| 71 | |
| 72 | name_ref_start = &actx->name[0]; |
| 73 | if (name_ref_start[0] == '*') { |
| 74 | /* Suffix match */ |
| 75 | name_ref_start += 1; |
| 76 | name_ref_len = strlen(name_ref_start); |
| 77 | if (name_ref_len > name_req_len) |
| 78 | continue; |
| 79 | } else { |
| 80 | name_ref_len = strlen(name_ref_start); |
| 81 | if (name_ref_len != name_req_len) |
| 82 | continue; |
| 83 | } |
| 84 | |
| 85 | name_match_start = name + (name_req_len - name_ref_len); |
| 86 | if (strcasecmp(name_match_start, name_ref_start) != 0) |
| 87 | continue; |
| 88 | |
| 89 | /* IMSI and name match */ |
| 90 | |
| 91 | if (imsi_ref_len == imsi_prio && name_ref_len < name_prio) |
| 92 | /* Lower priority, skip */ |
| 93 | continue; |
| 94 | |
| 95 | imsi_prio = imsi_ref_len; |
| 96 | name_prio = name_ref_len; |
| 97 | found_actx = actx; |
| 98 | } |
| 99 | return found_actx; |
| 100 | } |
| 101 | |
| 102 | struct apn_ctx *sgsn_apn_ctx_by_name(const char *name, const char *imsi_prefix) |
| 103 | { |
| 104 | struct apn_ctx *actx; |
| 105 | |
Pau Espin Pedrol | fd4d435 | 2023-01-05 19:37:05 +0100 | [diff] [blame] | 106 | llist_for_each_entry(actx, &sgsn->apn_list, list) { |
Pau Espin Pedrol | ffd6e37 | 2023-01-05 17:45:25 +0100 | [diff] [blame] | 107 | if (strcasecmp(name, actx->name) == 0 && |
| 108 | strcasecmp(imsi_prefix, actx->imsi_prefix) == 0) |
| 109 | return actx; |
| 110 | } |
| 111 | return NULL; |
| 112 | } |
| 113 | |
| 114 | struct apn_ctx *sgsn_apn_ctx_find_alloc(const char *name, const char *imsi_prefix) |
| 115 | { |
| 116 | struct apn_ctx *actx; |
| 117 | |
| 118 | actx = sgsn_apn_ctx_by_name(name, imsi_prefix); |
| 119 | if (!actx) |
| 120 | actx = sgsn_apn_ctx_alloc(name, imsi_prefix); |
| 121 | |
| 122 | return actx; |
| 123 | } |