| /* Message connection list handling */ |
| |
| /* |
| * (C) 2017 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| * All Rights Reserved |
| * |
| * Author: Philipp Maier |
| * |
| * 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 <osmocom/mgcp/mgcp_conn.h> |
| #include <osmocom/mgcp/mgcp_internal.h> |
| #include <osmocom/mgcp/mgcp_common.h> |
| #include <osmocom/mgcp/mgcp_ep.h> |
| |
| /* Reset codec state and free memory */ |
| static void mgcp_rtp_codec_reset(struct mgcp_rtp_codec *codec) |
| { |
| codec->payload_type = -1; |
| codec->subtype_name = NULL; |
| codec->audio_name = NULL; |
| codec->frame_duration_num = DEFAULT_RTP_AUDIO_FRAME_DUR_NUM; |
| codec->frame_duration_den = DEFAULT_RTP_AUDIO_FRAME_DUR_DEN; |
| codec->rate = DEFAULT_RTP_AUDIO_DEFAULT_RATE; |
| codec->channels = DEFAULT_RTP_AUDIO_DEFAULT_CHANNELS; |
| |
| /* see also mgcp_sdp.c, mgcp_set_audio_info() */ |
| talloc_free(codec->subtype_name); |
| talloc_free(codec->audio_name); |
| } |
| |
| /* Reset states, free memory, set defaults and reset codec state */ |
| static void mgcp_rtp_conn_reset(struct mgcp_conn_rtp *conn) |
| { |
| struct mgcp_rtp_end *end = &conn->end; |
| |
| conn->type = MGCP_RTP_DEFAULT; |
| conn->osmux.allocated_cid = -1; |
| |
| end->rtp.fd = -1; |
| end->rtcp.fd = -1; |
| end->local_port = 0; |
| end->packets_rx = 0; |
| end->octets_rx = 0; |
| end->packets_tx = 0; |
| end->octets_tx = 0; |
| end->dropped_packets = 0; |
| end->rtp_port = end->rtcp_port = 0; |
| talloc_free(end->fmtp_extra); |
| end->fmtp_extra = NULL; |
| |
| /* Set default values */ |
| end->frames_per_packet = 0; /* unknown */ |
| end->packet_duration_ms = DEFAULT_RTP_AUDIO_PACKET_DURATION_MS; |
| end->output_enabled = 0; |
| |
| mgcp_rtp_codec_reset(&end->codec); |
| mgcp_rtp_codec_reset(&end->alt_codec); |
| } |
| |
| /*! allocate a new connection list entry. |
| * \param[in] ctx talloc context |
| * \param[in] endp associated endpoint |
| * \param[in] id identification number of the connection |
| * \param[in] type connection type (e.g. MGCP_CONN_TYPE_RTP) |
| * \returns pointer to allocated connection, NULL on error */ |
| struct mgcp_conn *mgcp_conn_alloc(void *ctx, struct mgcp_endpoint *endp, |
| uint32_t id, enum mgcp_conn_type type, |
| char *name) |
| { |
| struct mgcp_conn *conn; |
| OSMO_ASSERT(endp); |
| OSMO_ASSERT(endp->conns.next != NULL && endp->conns.prev != NULL); |
| OSMO_ASSERT(strlen(name) < sizeof(conn->name)); |
| |
| /* Do not allow more then two connections */ |
| if (llist_count(&endp->conns) >= endp->type->max_conns) |
| return NULL; |
| |
| /* Prevent duplicate connection IDs */ |
| if (mgcp_conn_get(endp, id)) |
| return NULL; |
| |
| /* Create new connection and add it to the list */ |
| conn = talloc_zero(ctx, struct mgcp_conn); |
| if (!conn) |
| return NULL; |
| conn->endp = endp; |
| conn->type = type; |
| conn->mode = MGCP_CONN_NONE; |
| conn->mode_orig = MGCP_CONN_NONE; |
| conn->id = id; |
| conn->u.rtp.conn = conn; |
| strcpy(conn->name, name); |
| |
| switch (type) { |
| case MGCP_CONN_TYPE_RTP: |
| mgcp_rtp_conn_reset(&conn->u.rtp); |
| break; |
| default: |
| /* NOTE: This should never be called with an |
| * invalid type, its up to the programmer |
| * to ensure propery types */ |
| OSMO_ASSERT(false); |
| } |
| |
| llist_add(&conn->entry, &endp->conns); |
| |
| return conn; |
| } |
| |
| /*! find a connection by its ID. |
| * \param[in] endp associated endpoint |
| * \param[in] id identification number of the connection |
| * \returns pointer to allocated connection, NULL if not found */ |
| struct mgcp_conn *mgcp_conn_get(struct mgcp_endpoint *endp, uint32_t id) |
| { |
| OSMO_ASSERT(endp); |
| OSMO_ASSERT(endp->conns.next != NULL && endp->conns.prev != NULL); |
| |
| struct mgcp_conn *conn; |
| |
| llist_for_each_entry(conn, &endp->conns, entry) { |
| if (conn->id == id) |
| return conn; |
| } |
| |
| return NULL; |
| } |
| |
| /*! find an RTP connection by its ID. |
| * \param[in] endp associated endpoint |
| * \param[in] id identification number of the connection |
| * \returns pointer to allocated connection, NULL if not found */ |
| struct mgcp_conn_rtp *mgcp_conn_get_rtp(struct mgcp_endpoint *endp, uint32_t id) |
| { |
| OSMO_ASSERT(endp); |
| OSMO_ASSERT(endp->conns.next != NULL && endp->conns.prev != NULL); |
| |
| struct mgcp_conn *conn; |
| |
| conn = mgcp_conn_get(endp, id); |
| if (!conn) |
| return NULL; |
| |
| if (conn->type == MGCP_CONN_TYPE_RTP) |
| return &conn->u.rtp; |
| |
| return NULL; |
| } |
| |
| /*! free a connection by its ID. |
| * \param[in] endp associated endpoint |
| * \param[in] id identification number of the connection */ |
| void mgcp_conn_free(struct mgcp_endpoint *endp, uint32_t id) |
| { |
| OSMO_ASSERT(endp); |
| OSMO_ASSERT(endp->conns.next != NULL && endp->conns.prev != NULL); |
| |
| struct mgcp_conn *conn; |
| |
| conn = mgcp_conn_get(endp, id); |
| if (!conn) |
| return; |
| |
| switch (conn->type) { |
| case MGCP_CONN_TYPE_RTP: |
| osmux_disable_conn(&conn->u.rtp); |
| osmux_release_cid(&conn->u.rtp); |
| mgcp_free_rtp_port(&conn->u.rtp.end); |
| break; |
| default: |
| /* NOTE: This should never be called with an |
| * invalid type, its up to the programmer |
| * to ensure propery types */ |
| OSMO_ASSERT(false); |
| } |
| |
| llist_del(&conn->entry); |
| talloc_free(conn); |
| } |
| |
| /*! free oldest connection in the list. |
| * \param[in] endp associated endpoint */ |
| void mgcp_conn_free_oldest(struct mgcp_endpoint *endp) |
| { |
| OSMO_ASSERT(endp); |
| OSMO_ASSERT(endp->conns.next != NULL && endp->conns.prev != NULL); |
| |
| struct mgcp_conn *conn; |
| |
| if (llist_empty(&endp->conns)) |
| return; |
| |
| conn = llist_last_entry(&endp->conns, struct mgcp_conn, entry); |
| if (!conn) |
| return; |
| |
| mgcp_conn_free(endp, conn->id); |
| } |
| |
| /*! free all connections at once. |
| * \param[in] endp associated endpoint */ |
| void mgcp_conn_free_all(struct mgcp_endpoint *endp) |
| { |
| OSMO_ASSERT(endp); |
| OSMO_ASSERT(endp->conns.next != NULL && endp->conns.prev != NULL); |
| |
| struct mgcp_conn *conn; |
| struct mgcp_conn *conn_tmp; |
| |
| /* Drop all items in the list */ |
| llist_for_each_entry_safe(conn, conn_tmp, &endp->conns, entry) { |
| mgcp_conn_free(endp, conn->id); |
| } |
| |
| return; |
| } |
| |
| /*! dump basic connection information to human readble string. |
| * \param[in] conn to dump |
| * \returns human readble string */ |
| char *mgcp_conn_dump(struct mgcp_conn *conn) |
| { |
| static char str[256]; |
| |
| if (!conn) { |
| snprintf(str, sizeof(str), "(null connection)"); |
| return str; |
| } |
| |
| switch (conn->type) { |
| case MGCP_CONN_TYPE_RTP: |
| /* Dump RTP connection */ |
| snprintf(str, sizeof(str), "(%s/rtp, id:%u, ip:%s, " |
| "rtp:%u rtcp:%u)", |
| conn->name, |
| conn->id, |
| inet_ntoa(conn->u.rtp.end.addr), |
| ntohs(conn->u.rtp.end.rtp_port), |
| ntohs(conn->u.rtp.end.rtcp_port)); |
| break; |
| |
| default: |
| /* Should not happen, we should be able to dump |
| * every possible connection type. */ |
| snprintf(str, sizeof(str), "(unknown connection type)"); |
| break; |
| } |
| |
| return str; |
| } |
| |
| /*! find destination connection on a specific endpoint. |
| * \param[in] conn to search a destination for |
| * \returns destination connection, NULL on failure */ |
| struct mgcp_conn *mgcp_find_dst_conn(struct mgcp_conn *conn) |
| { |
| struct mgcp_endpoint *endp; |
| struct mgcp_conn *partner_conn; |
| endp = conn->endp; |
| |
| /*! NOTE: This simply works by grabbing the first connection that is |
| * not the supplied connection, which is suitable for endpoints that |
| * do not serve more than two connections. */ |
| |
| llist_for_each_entry(partner_conn, &endp->conns, entry) { |
| if (conn != partner_conn) { |
| return partner_conn; |
| } |
| } |
| |
| return NULL; |
| } |