Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 1 | /* Trunk handling */ |
| 2 | |
| 3 | /* |
| 4 | * (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 5 | * (C) 2009-2012 by On-Waves |
| 6 | * (C) 2017-2020 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| 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 <osmocom/mgcp/mgcp_internal.h> |
| 25 | #include <osmocom/mgcp/mgcp_endp.h> |
| 26 | #include <osmocom/mgcp/mgcp_trunk.h> |
| 27 | |
Philipp Maier | bce5f29 | 2020-06-18 11:57:17 +0200 | [diff] [blame] | 28 | /*! allocate trunk and add it (if required) to the trunk list. |
| 29 | * (called once at startup by VTY). |
| 30 | * \param[in] cfg mgcp configuration. |
Philipp Maier | bce5f29 | 2020-06-18 11:57:17 +0200 | [diff] [blame] | 31 | * \param[in] ttype trunk type. |
Philipp Maier | 080935a | 2020-07-01 23:08:50 +0200 | [diff] [blame] | 32 | * \param[in] nr trunk number. |
Philipp Maier | bce5f29 | 2020-06-18 11:57:17 +0200 | [diff] [blame] | 33 | * \returns pointer to allocated trunk, NULL on failure. */ |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 34 | struct mgcp_trunk *mgcp_trunk_alloc(struct mgcp_config *cfg, enum mgcp_trunk_type ttype, int nr) |
| 35 | { |
| 36 | struct mgcp_trunk *trunk; |
| 37 | |
| 38 | trunk = talloc_zero(cfg, struct mgcp_trunk); |
| 39 | if (!trunk) { |
| 40 | LOGP(DLMGCP, LOGL_ERROR, "Failed to allocate.\n"); |
| 41 | return NULL; |
| 42 | } |
| 43 | |
| 44 | trunk->cfg = cfg; |
| 45 | trunk->trunk_type = ttype; |
| 46 | trunk->trunk_nr = nr; |
| 47 | |
| 48 | trunk->audio_send_ptime = 1; |
| 49 | trunk->audio_send_name = 1; |
| 50 | trunk->vty_number_endpoints = 33; |
| 51 | trunk->omit_rtcp = 0; |
| 52 | |
| 53 | mgcp_trunk_set_keepalive(trunk, MGCP_KEEPALIVE_ONCE); |
| 54 | |
Philipp Maier | d19de2e | 2020-06-03 13:55:33 +0200 | [diff] [blame] | 55 | llist_add_tail(&trunk->entry, &cfg->trunks); |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 56 | |
| 57 | mgcp_ratectr_trunk_alloc(cfg, &trunk->ratectr); |
| 58 | |
| 59 | return trunk; |
| 60 | } |
| 61 | |
Philipp Maier | bce5f29 | 2020-06-18 11:57:17 +0200 | [diff] [blame] | 62 | /*! allocate endpoints and set default values |
| 63 | * (called once at startup by VTY). |
| 64 | * \param[in] trunk trunk configuration. |
| 65 | * \returns 0 on success, -1 on failure. */ |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 66 | int mgcp_trunk_alloc_endpts(struct mgcp_trunk *trunk) |
| 67 | { |
| 68 | int i; |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 69 | struct mgcp_endpoint *endp; |
| 70 | |
| 71 | /* Make sure the amount of requested endpoints does not execeed |
| 72 | * sane limits. The VTY already limits the possible amount, |
| 73 | * however miss-initalation of the struct or memory corruption |
| 74 | * could still lead to an excessive allocation of endpoints, so |
| 75 | * better stop early if that is the case. */ |
| 76 | OSMO_ASSERT(trunk->vty_number_endpoints < 65534); |
| 77 | |
| 78 | /* This function is called once on startup by the VTY to allocate the |
| 79 | * endpoints. The number of endpoints must not change througout the |
| 80 | * runtime of the MGW */ |
| 81 | OSMO_ASSERT(trunk->number_endpoints == 0); |
| 82 | OSMO_ASSERT(trunk->endpoints == NULL); |
| 83 | |
| 84 | /* allocate pointer array for the endpoints */ |
| 85 | trunk->endpoints = _talloc_zero_array(trunk->cfg, |
| 86 | sizeof(struct mgcp_endpoint *), trunk->vty_number_endpoints, "endpoints"); |
| 87 | if (!trunk->endpoints) |
| 88 | return -1; |
| 89 | |
| 90 | /* create endpoints */ |
| 91 | for (i = 0; i < trunk->vty_number_endpoints; ++i) { |
Philipp Maier | 7462b95 | 2020-06-10 14:50:34 +0200 | [diff] [blame] | 92 | endp = mgcp_endp_alloc(trunk, i); |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 93 | if (!endp) { |
| 94 | talloc_free(trunk->endpoints); |
| 95 | return -1; |
| 96 | } |
| 97 | trunk->endpoints[i] = endp; |
| 98 | } |
| 99 | |
| 100 | /* make the endpoints we just created available to the MGW code */ |
| 101 | trunk->number_endpoints = trunk->vty_number_endpoints; |
| 102 | |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | /*! get trunk configuration by trunk number (index). |
Philipp Maier | bce5f29 | 2020-06-18 11:57:17 +0200 | [diff] [blame] | 107 | * \param[in] cfg mgcp configuration. |
| 108 | * \param[in] index trunk number. |
| 109 | * \returns pointer to trunk configuration, NULL on error. */ |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 110 | struct mgcp_trunk *mgcp_trunk_by_num(const struct mgcp_config *cfg, int index) |
| 111 | { |
| 112 | struct mgcp_trunk *trunk; |
| 113 | |
| 114 | llist_for_each_entry(trunk, &cfg->trunks, entry) |
| 115 | if (trunk->trunk_nr == index) |
| 116 | return trunk; |
| 117 | |
| 118 | return NULL; |
| 119 | } |
| 120 | |
Philipp Maier | 7e9ddc9 | 2020-06-10 15:22:32 +0200 | [diff] [blame] | 121 | /* Made public for unit-testing, do not use from outside this file */ |
| 122 | int e1_trunk_nr_from_epname(const char *epname) |
| 123 | { |
| 124 | unsigned long int trunk_nr; |
| 125 | size_t prefix_len; |
| 126 | char *str_trunk_nr_end; |
| 127 | |
| 128 | prefix_len = sizeof(MGCP_ENDPOINT_PREFIX_E1_TRUNK) - 1; |
| 129 | if (strncmp(epname, MGCP_ENDPOINT_PREFIX_E1_TRUNK, prefix_len) != 0) |
| 130 | return -EINVAL; |
| 131 | |
| 132 | errno = 0; |
| 133 | trunk_nr = strtoul(epname + prefix_len, &str_trunk_nr_end, 10); |
| 134 | if (errno == ERANGE || trunk_nr > 64 || trunk_nr == 0 |
| 135 | || epname + prefix_len == str_trunk_nr_end |
| 136 | || str_trunk_nr_end[0] != '/') |
| 137 | return -EINVAL; |
| 138 | else |
| 139 | return trunk_nr; |
| 140 | } |
| 141 | |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 142 | /*! Find a trunk by the trunk prefix in the endpoint name. |
| 143 | * \param[in] epname endpoint name with trunk prefix to look up. |
| 144 | * \param[in] cfg that contains the trunks where the endpoint is located. |
| 145 | * \returns trunk or NULL if trunk was not found. */ |
| 146 | struct mgcp_trunk *mgcp_trunk_by_name(const struct mgcp_config *cfg, const char *epname) |
| 147 | { |
| 148 | size_t prefix_len; |
| 149 | char epname_lc[MGCP_ENDPOINT_MAXLEN]; |
Philipp Maier | 7e9ddc9 | 2020-06-10 15:22:32 +0200 | [diff] [blame] | 150 | unsigned long int trunk_nr; |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 151 | |
| 152 | osmo_str_tolower_buf(epname_lc, sizeof(epname_lc), epname); |
| 153 | epname = epname_lc; |
| 154 | |
| 155 | prefix_len = sizeof(MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK) - 1; |
| 156 | if (strncmp(epname, MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK, prefix_len) == 0) { |
Philipp Maier | 7a64182 | 2020-06-15 16:05:42 +0200 | [diff] [blame] | 157 | return mgcp_trunk_by_num(cfg, MGCP_VIRT_TRUNK_ID); |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 158 | } |
| 159 | |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 160 | prefix_len = sizeof(MGCP_ENDPOINT_PREFIX_E1_TRUNK) - 1; |
| 161 | if (strncmp(epname, MGCP_ENDPOINT_PREFIX_E1_TRUNK, prefix_len) == 0) { |
Philipp Maier | 7e9ddc9 | 2020-06-10 15:22:32 +0200 | [diff] [blame] | 162 | trunk_nr = e1_trunk_nr_from_epname(epname); |
| 163 | if (trunk_nr < 0) |
| 164 | return NULL; |
| 165 | return mgcp_trunk_by_num(cfg, trunk_nr); |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 166 | } |
| 167 | |
| 168 | /* Earlier versions of osmo-mgw were accepting endpoint names |
| 169 | * without trunk prefix. This is normally not allowed, each MGCP |
| 170 | * request should supply an endpoint name with trunk prefix. |
| 171 | * However in order to stay compatible with old versions of |
| 172 | * osmo-bsc and osmo-msc we still accept endpoint names without |
| 173 | * trunk prefix and just assume that the virtual trunk should |
| 174 | * be selected. There is even a TTCN3 test for this, see also: |
| 175 | * MGCP_Test.TC_crcx_noprefix */ |
| 176 | if ((epname[0] >= '0' && epname[0] <= '9') || (epname[0] >= 'a' && epname[0] <= 'f')) { |
| 177 | LOGP(DLMGCP, LOGL_ERROR, "missing trunk prefix in endpoint name \"%s\", assuming trunk \"%s\"!\n", epname, |
| 178 | MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK); |
Philipp Maier | d19de2e | 2020-06-03 13:55:33 +0200 | [diff] [blame] | 179 | return mgcp_trunk_by_num(cfg, MGCP_VIRT_TRUNK_ID); |
Philipp Maier | c66ab2c | 2020-06-02 20:55:34 +0200 | [diff] [blame] | 180 | } |
| 181 | |
| 182 | LOGP(DLMGCP, LOGL_ERROR, "unable to find trunk for endpoint name \"%s\"!\n", epname); |
| 183 | return NULL; |
| 184 | } |