| /* MSC related stuff... */ |
| /* |
| * (C) 2010-2013 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 2010-2013 by On-Waves |
| * 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 <msc_connection.h> |
| #include <bsc_data.h> |
| #include <bsc_sccp.h> |
| #include <bssap_sccp.h> |
| #include <ipaccess.h> |
| #include <mtp_data.h> |
| #include <cellmgr_debug.h> |
| #include <ss7_application.h> |
| #include <mgcp_patch.h> |
| |
| #include <osmocom/core/socket.h> |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/core/utils.h> |
| #include <osmocom/core/write_queue.h> |
| #include <osmocom/gsm/tlv.h> |
| |
| #include <arpa/inet.h> |
| #include <sys/socket.h> |
| #include <netinet/tcp.h> |
| |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <string.h> |
| |
| #define RECONNECT_TIME 10, 0 |
| #define NAT_MUX 0xfc |
| |
| static void msc_send_id_response(struct msc_connection *bsc); |
| static void msc_send(struct msc_connection *bsc, struct msgb *msg, int proto); |
| static void msc_schedule_reconnect(struct msc_connection *bsc); |
| static int msc_conn_bind(struct msc_connection *bsc); |
| static void msc_handle_id_response(struct msc_connection *bsc, struct msgb *msg); |
| |
| void msc_close_connection(struct msc_connection *fw) |
| { |
| struct osmo_fd *bfd = &fw->msc_connection.bfd; |
| |
| if (bfd->fd >= 0) { |
| close(bfd->fd); |
| osmo_fd_unregister(bfd); |
| bfd->fd = -1; |
| } |
| |
| fw->msc_link_down = 1; |
| release_bsc_resources(fw); |
| osmo_timer_del(&fw->ping_timeout); |
| osmo_timer_del(&fw->pong_timeout); |
| osmo_timer_del(&fw->msc_timeout); |
| osmo_wqueue_clear(&fw->msc_connection); |
| ss7_application_msc_down(fw->app); |
| msc_schedule_reconnect(fw); |
| } |
| |
| static void msc_connect_timeout(void *_fw_data) |
| { |
| struct msc_connection *fw = _fw_data; |
| |
| LOGP(DMSC, LOGL_ERROR, "Timeout on the MSC connection.\n"); |
| msc_close_connection(fw); |
| } |
| |
| static void msc_pong_timeout(void *_fw_data) |
| { |
| struct msc_connection *fw = _fw_data; |
| LOGP(DMSC, LOGL_ERROR, "MSC didn't respond to ping. Closing.\n"); |
| msc_close_connection(fw); |
| } |
| |
| static void send_ping(struct msc_connection *fw) |
| { |
| struct msgb *msg; |
| |
| msg = msgb_alloc_headroom(4096, 128, "ping"); |
| if (!msg) { |
| LOGP(DMSC, LOGL_ERROR, "Failed to create PING.\n"); |
| return; |
| } |
| |
| msg->l2h = msgb_put(msg, 1); |
| msg->l2h[0] = IPAC_MSGT_PING; |
| |
| msc_send(fw, msg, IPAC_PROTO_IPACCESS); |
| } |
| |
| static void msc_ping_timeout(void *_fw_data) |
| { |
| struct msc_connection *fw = _fw_data; |
| |
| if (fw->ping_time < 0) |
| return; |
| |
| send_ping(fw); |
| |
| /* send another ping in 20 seconds */ |
| osmo_timer_schedule(&fw->ping_timeout, fw->ping_time, 0); |
| |
| /* also start a pong timer */ |
| osmo_timer_schedule(&fw->pong_timeout, fw->pong_time, 0); |
| } |
| |
| /* |
| * callback with IP access data |
| */ |
| static int ipaccess_a_fd_cb(struct osmo_fd *bfd) |
| { |
| int error; |
| struct ipaccess_head *hh; |
| struct msc_connection *fw; |
| struct msgb *msg; |
| |
| fw = bfd->data; |
| msg = ipaccess_read_msg(bfd, &error); |
| |
| if (!msg) { |
| if (error == 0) |
| fprintf(stderr, "The connection to the MSC was lost, exiting\n"); |
| else |
| fprintf(stderr, "Error in the IPA stream.\n"); |
| |
| msc_close_connection(fw); |
| return -1; |
| } |
| |
| LOGP(DMSC, LOGL_DEBUG, "From MSC: %s proto: %d\n", osmo_hexdump(msg->data, msg->len), msg->l2h[0]); |
| |
| /* handle base message handling */ |
| hh = (struct ipaccess_head *) msg->data; |
| ipaccess_rcvmsg_base(msg, bfd); |
| |
| /* initialize the networking. This includes sending a GSM08.08 message */ |
| if (hh->proto == IPAC_PROTO_IPACCESS) { |
| if (fw->first_contact) { |
| LOGP(DMSC, LOGL_NOTICE, "Connected to MSC. Sending reset.\n"); |
| osmo_timer_del(&fw->msc_timeout); |
| fw->first_contact = 0; |
| fw->msc_link_down = 0; |
| ss7_application_msc_up(fw->app); |
| msc_send_reset(fw); |
| } |
| if (msg->l2h[0] == IPAC_MSGT_ID_GET && fw->token) { |
| msc_send_id_response(fw); |
| } else if (msg->l2h[0] == IPAC_MSGT_PONG) { |
| osmo_timer_del(&fw->pong_timeout); |
| } else if (msg->l2h[0] == IPAC_MSGT_ID_RESP) { |
| msc_handle_id_response(fw, msg); |
| } |
| |
| msgb_free(msg); |
| return 0; |
| } |
| |
| if (fw->mode == MSC_MODE_SERVER && !fw->auth) { |
| LOGP(DMSC, LOGL_ERROR, |
| "Ignoring non ipa message for unauth user.\n"); |
| msgb_free(msg); |
| return -1; |
| } |
| |
| if (hh->proto == IPAC_PROTO_SCCP) { |
| msc_dispatch_sccp(fw, msg); |
| } else if (hh->proto == NAT_MUX) { |
| msg = mgcp_patch(fw->app, msg); |
| mgcp_forward(&fw->mgcp_agent, msg->l2h, msgb_l2len(msg)); |
| } else { |
| LOGP(DMSC, LOGL_ERROR, "Unknown IPA proto 0x%x\n", hh->proto); |
| } |
| |
| msgb_free(msg); |
| return 0; |
| } |
| |
| static int ipaccess_write_cb(struct osmo_fd *fd, struct msgb *msg) |
| { |
| int rc; |
| |
| LOGP(DMSC, LOGL_DEBUG, "Sending to MSC: %s\n", osmo_hexdump(msg->data, msg->len)); |
| rc = write(fd->fd, msg->data, msg->len); |
| if (rc != msg->len) |
| LOGP(DMSC, LOGL_ERROR, "Could not write to MSC.\n"); |
| |
| return rc; |
| } |
| |
| /* called in the case of a non blocking connect */ |
| static int msc_connection_connect(struct osmo_fd *fd, unsigned int what) |
| { |
| int rc; |
| int val; |
| socklen_t len = sizeof(val); |
| struct msc_connection *fw; |
| |
| fw = fd->data; |
| |
| if (fd != &fw->msc_connection.bfd) { |
| LOGP(DMSC, LOGL_ERROR, "This is only working with the MSC connection.\n"); |
| return -1; |
| } |
| |
| if ((what & BSC_FD_WRITE) == 0) |
| return -1; |
| |
| /* check the socket state */ |
| rc = getsockopt(fd->fd, SOL_SOCKET, SO_ERROR, &val, &len); |
| if (rc != 0) { |
| LOGP(DMSC, LOGL_ERROR, "getsockopt for the MSC socket failed.\n"); |
| goto error; |
| } |
| if (val != 0) { |
| LOGP(DMSC, LOGL_ERROR, "Not connected to the MSC.\n"); |
| goto error; |
| } |
| |
| |
| /* go to full operation */ |
| fd->cb = osmo_wqueue_bfd_cb; |
| fd->when = BSC_FD_READ; |
| if (!llist_empty(&fw->msc_connection.msg_queue)) |
| fd->when |= BSC_FD_WRITE; |
| return 0; |
| |
| error: |
| msc_close_connection(fw); |
| return -1; |
| } |
| |
| static int setnonblocking(struct osmo_fd *fd) |
| { |
| int flags; |
| |
| flags = fcntl(fd->fd, F_GETFL); |
| if (flags < 0) { |
| perror("fcntl get failed"); |
| close(fd->fd); |
| fd->fd = -1; |
| return -1; |
| } |
| |
| flags |= O_NONBLOCK; |
| flags = fcntl(fd->fd, F_SETFL, flags); |
| if (flags < 0) { |
| perror("fcntl get failed"); |
| close(fd->fd); |
| fd->fd = -1; |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int connect_to_msc(struct osmo_fd *fd, const char *ip, int port, int tos) |
| { |
| struct sockaddr_in sin; |
| int on = 1, ret; |
| |
| LOGP(DMSC, LOGL_NOTICE, "Attempting to connect MSC at %s:%d\n", ip, port); |
| |
| fd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| |
| if (fd->fd < 0) { |
| perror("Creating TCP socket failed"); |
| return fd->fd; |
| } |
| |
| /* make it non blocking */ |
| if (setnonblocking(fd) != 0) |
| return -1; |
| |
| memset(&sin, 0, sizeof(sin)); |
| sin.sin_family = AF_INET; |
| sin.sin_port = htons(port); |
| inet_aton(ip, &sin.sin_addr); |
| |
| setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| ret = setsockopt(fd->fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)); |
| if (ret != 0) |
| LOGP(DMSC, LOGL_ERROR, "Failed to set TCP_NODELAY: %s\n", strerror(errno)); |
| ret = setsockopt(fd->fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)); |
| if (ret != 0) |
| LOGP(DMSC, LOGL_ERROR, "Failed to set IP_TOS: %s\n", strerror(errno)); |
| |
| ret = connect(fd->fd, (struct sockaddr *) &sin, sizeof(sin)); |
| |
| if (ret == -1 && errno == EINPROGRESS) { |
| LOGP(DMSC, LOGL_ERROR, "MSC Connection in progress\n"); |
| fd->when = BSC_FD_WRITE; |
| fd->cb = msc_connection_connect; |
| } else if (ret < 0) { |
| perror("Connection failed"); |
| close(fd->fd); |
| fd->fd = -1; |
| return ret; |
| } else { |
| fd->when = BSC_FD_READ; |
| fd->cb = osmo_wqueue_bfd_cb; |
| } |
| |
| ret = osmo_fd_register(fd); |
| if (ret < 0) { |
| perror("Registering the fd failed"); |
| close(fd->fd); |
| fd->fd = -1; |
| return ret; |
| } |
| |
| return ret; |
| } |
| |
| static void msc_reconnect(void *_data) |
| { |
| int rc; |
| struct msc_connection *fw = _data; |
| |
| osmo_timer_del(&fw->reconnect_timer); |
| fw->first_contact = 1; |
| |
| rc = connect_to_msc(&fw->msc_connection.bfd, fw->ip, fw->port, fw->dscp); |
| if (rc < 0) { |
| fprintf(stderr, "Opening the MSC connection failed. Trying again\n"); |
| osmo_timer_schedule(&fw->reconnect_timer, RECONNECT_TIME); |
| return; |
| } |
| |
| fw->msc_timeout.cb = msc_connect_timeout; |
| fw->msc_timeout.data = fw; |
| osmo_timer_schedule(&fw->msc_timeout, fw->msc_time, 0); |
| } |
| |
| static void msc_schedule_reconnect(struct msc_connection *fw) |
| { |
| if (fw->mode == MSC_MODE_SERVER) |
| return; |
| osmo_timer_schedule(&fw->reconnect_timer, RECONNECT_TIME); |
| } |
| |
| /* |
| * mgcp forwarding is below |
| */ |
| /* send a RSIP to the MGCP GW */ |
| void msc_mgcp_reset(struct msc_connection *msc) |
| { |
| char buf[512]; |
| char *dest = "mgw"; |
| |
| if (msc->app->mgcp_domain_name) |
| dest = msc->app->mgcp_domain_name; |
| |
| snprintf(buf, sizeof(buf) - 1, "RSIP 1 13@%s MGCP 1.0\r\n", dest); |
| buf[sizeof(buf) - 1] = '\0'; |
| |
| mgcp_forward(&msc->mgcp_agent, (const uint8_t *) buf, strlen(buf)); |
| } |
| |
| static void msc_mgcp_read_cb(struct mgcp_callagent *agent, struct msgb *msg) |
| { |
| struct msc_connection *fw = container_of(agent, struct msc_connection, mgcp_agent); |
| msc_send(fw, msg, NAT_MUX); |
| } |
| |
| static void msc_send(struct msc_connection *fw, struct msgb *msg, int proto) |
| { |
| if (fw->msc_link_down) { |
| LOGP(DMSC, LOGL_NOTICE, "Dropping data due lack of MSC connection.\n"); |
| msgb_free(msg); |
| return; |
| } |
| |
| ipaccess_prepend_header(msg, proto); |
| |
| if (osmo_wqueue_enqueue(&fw->msc_connection, msg) != 0) { |
| LOGP(DMSC, LOGL_FATAL, "Failed to queue MSG for the MSC.\n"); |
| msgb_free(msg); |
| return; |
| } |
| } |
| |
| void msc_send_rlc(struct msc_connection *fw, |
| struct sccp_source_reference *src, struct sccp_source_reference *dst) |
| { |
| struct msgb *msg; |
| |
| if (fw->msc_link_down) { |
| LOGP(DMSC, LOGL_NOTICE, "Not releasing connection due lack of connection.\n"); |
| return; |
| } |
| |
| msg = create_sccp_rlc(src, dst); |
| if (!msg) |
| return; |
| |
| msc_send(fw, msg, IPAC_PROTO_SCCP); |
| } |
| |
| void msc_send_reset(struct msc_connection *fw) |
| { |
| struct msgb *msg; |
| |
| if (fw->msc_link_down) { |
| LOGP(DMSC, LOGL_NOTICE, "Not sending reset due lack of connection.\n"); |
| return; |
| } |
| |
| /* start the ping/pong but nothing else */ |
| if (fw->mode == MSC_MODE_SERVER) { |
| LOGP(DMSC, LOGL_DEBUG, "Not sending BSSMAP resets in server mode.\n"); |
| msc_ping_timeout(fw); |
| return; |
| } |
| |
| |
| msg = create_reset(); |
| if (!msg) |
| return; |
| |
| msc_send(fw, msg, IPAC_PROTO_SCCP); |
| msc_ping_timeout(fw); |
| } |
| |
| static void msc_send_id_response(struct msc_connection *fw) |
| { |
| struct msgb *msg; |
| |
| if (fw->mode == MSC_MODE_SERVER) { |
| LOGP(DMSC, LOGL_DEBUG, |
| "Not sending our token in server mode.\n"); |
| return; |
| } |
| |
| msg = msgb_alloc_headroom(4096, 128, "id resp"); |
| msg->l2h = msgb_v_put(msg, IPAC_MSGT_ID_RESP); |
| msgb_l16tv_put(msg, strlen(fw->token) + 1, |
| IPAC_IDTAG_UNITNAME, (uint8_t *) fw->token); |
| |
| msc_send(fw, msg, IPAC_PROTO_IPACCESS); |
| } |
| |
| void msc_send_direct(struct msc_connection *fw, struct msgb *msg) |
| { |
| return msc_send(fw, msg, IPAC_PROTO_SCCP); |
| } |
| |
| struct msc_connection *msc_connection_create(struct bsc_data *bsc, int mgcp) |
| { |
| struct msc_connection *msc; |
| |
| msc = talloc_zero(NULL, struct msc_connection); |
| if (!msc) { |
| LOGP(DMSC, LOGL_ERROR, "Failed to allocate the MSC Connection.\n"); |
| return NULL; |
| } |
| |
| msc->mode = MSC_MODE_CLIENT; |
| msc->port = 5000; |
| |
| osmo_wqueue_init(&msc->msc_connection, 100); |
| msc->reconnect_timer.cb = msc_reconnect; |
| msc->reconnect_timer.data = msc; |
| msc->msc_connection.read_cb = ipaccess_a_fd_cb; |
| msc->msc_connection.write_cb = ipaccess_write_cb; |
| msc->msc_connection.bfd.data = msc; |
| msc->msc_connection.bfd.fd = -1; |
| msc->msc_link_down = 1; |
| |
| /* handle the timeout */ |
| msc->ping_time = -1; |
| msc->ping_timeout.cb = msc_ping_timeout; |
| msc->ping_timeout.data = msc; |
| msc->pong_timeout.cb = msc_pong_timeout; |
| msc->pong_timeout.data = msc; |
| |
| /* create MGCP port */ |
| if (mgcp && mgcp_create_port(&msc->mgcp_agent) != 0) { |
| LOGP(DMSC, LOGL_ERROR, "Failed to bind for the MGCP port.\n"); |
| talloc_free(msc); |
| return NULL; |
| } |
| |
| llist_add_tail(&msc->entry, &bsc->mscs); |
| msc->nr = bsc->num_mscs++; |
| msc->mgcp_agent.read_cb = msc_mgcp_read_cb; |
| |
| return msc; |
| } |
| |
| struct msc_connection *msc_connection_num(struct bsc_data *bsc, int num) |
| { |
| struct msc_connection *msc; |
| |
| llist_for_each_entry(msc, &bsc->mscs, entry) |
| if (msc->nr == num) |
| return msc; |
| return NULL; |
| } |
| |
| int msc_connection_start(struct msc_connection *msc) |
| { |
| if (msc->msc_connection.bfd.fd > 0) { |
| LOGP(DMSC, LOGL_ERROR, |
| "Function should not be called with active connection.\n"); |
| return -1; |
| } |
| |
| /* bind and wait if we are a server */ |
| if (msc->mode == MSC_MODE_SERVER) |
| return msc_conn_bind(msc); |
| |
| msc_schedule_reconnect(msc); |
| return 0; |
| } |
| |
| const char *msc_mode(struct msc_connection *msc) |
| { |
| switch (msc->mode) { |
| case MSC_MODE_CLIENT: |
| return "client"; |
| case MSC_MODE_SERVER: |
| return "server"; |
| } |
| |
| return "invalid"; |
| } |
| |
| /* Non-clean MSC server socket abstraction.. bind and accept */ |
| static int msc_send_auth_req(struct msc_connection *msc) |
| { |
| struct msgb *msg; |
| |
| static const uint8_t id_req[] = { |
| IPAC_MSGT_ID_GET, |
| 0x01, IPAC_IDTAG_UNIT, |
| 0x01, IPAC_IDTAG_MACADDR, |
| 0x01, IPAC_IDTAG_LOCATION1, |
| 0x01, IPAC_IDTAG_LOCATION2, |
| 0x01, IPAC_IDTAG_EQUIPVERS, |
| 0x01, IPAC_IDTAG_SWVERSION, |
| 0x01, IPAC_IDTAG_UNITNAME, |
| 0x01, IPAC_IDTAG_SERNR, |
| }; |
| |
| msg = msgb_alloc_headroom(4096, 128, "auth"); |
| if (!msg) { |
| LOGP(DMSC, LOGL_ERROR, "Failed to allocate auth.\n"); |
| msc_close_connection(msc); |
| return -1; |
| } |
| |
| msg->l2h = msgb_put(msg, ARRAY_SIZE(id_req)); |
| memcpy(msg->l2h, id_req, ARRAY_SIZE(id_req)); |
| |
| msc_send(msc, msg, IPAC_PROTO_IPACCESS); |
| return 0; |
| } |
| |
| static void msc_handle_id_response(struct msc_connection *msc, struct msgb *msg) |
| { |
| unsigned int len; |
| const char *token; |
| |
| /* only for the server */ |
| if (msc->mode != MSC_MODE_SERVER) { |
| LOGP(DMSC, LOGL_ERROR, "Unexpected ID response for client.\n"); |
| return; |
| } |
| |
| if (!msc->token) { |
| LOGP(DMSC, LOGL_ERROR, "No token defined. Giving up.\n"); |
| goto clean; |
| } |
| |
| if (msgb_l2len(msg) < 4) { |
| LOGP(DMSC, LOGL_ERROR, "Too short message...%u\n", |
| msgb_l2len(msg)); |
| goto clean; |
| } |
| |
| /* in lack of ipaccess_idtag_parse we have a very basic method */ |
| if (msg->l2h[3] != IPAC_IDTAG_UNITNAME) { |
| LOGP(DMSC, LOGL_ERROR, "Expected unitname tag got %d\n", |
| msg->l2h[3]); |
| goto clean; |
| } |
| |
| token = (const char *) &msg->l2h[4]; |
| len = msgb_l2len(msg) - 4; |
| |
| if (len != strlen(msc->token)) { |
| LOGP(DMSC, LOGL_ERROR, "Wrong length %u vs. %zu\n", |
| len, strlen(msc->token)); |
| goto clean; |
| } |
| |
| if (memcmp(msc->token, token, len) != 0) { |
| LOGP(DMSC, LOGL_ERROR, "Token has the wrong size.\n"); |
| goto clean; |
| } |
| |
| LOGP(DMSC, LOGL_NOTICE, "Authenticated the connection.\n"); |
| msc->auth = 1; |
| ss7_application_msc_up(msc->app); |
| return; |
| clean: |
| msc_close_connection(msc); |
| } |
| |
| static int msc_conn_accept(struct osmo_fd *bsc_fd, unsigned int what) |
| { |
| struct sockaddr_in addr; |
| socklen_t len = sizeof(addr); |
| struct msc_connection *msc = bsc_fd->data; |
| int ret; |
| |
| LOGP(DMSC, LOGL_NOTICE, "Going to accept a connection.\n"); |
| |
| ret = accept(bsc_fd->fd, (struct sockaddr *) &addr, &len); |
| if (ret < 0) { |
| LOGP(DMSC, LOGL_ERROR, "Accept failed with fd(%d) errno(%d)\n", |
| ret, errno); |
| return -1; |
| } |
| |
| /* |
| * Close the previous/current connection. |
| * TODO: switch only once we know it is a valid connection |
| */ |
| msc_close_connection(msc); |
| |
| /* re-set the internal state */ |
| msc->auth = 0; |
| |
| /* adopt the connection */ |
| msc->msc_connection.bfd.fd = ret; |
| msc->msc_connection.bfd.when = BSC_FD_READ; |
| ret = osmo_fd_register(&msc->msc_connection.bfd); |
| if (ret < 0) { |
| LOGP(DMSC, LOGL_ERROR, "Failed to register fd.\n"); |
| close(msc->msc_connection.bfd.fd); |
| msc->msc_connection.bfd.fd = -1; |
| return -1; |
| } |
| |
| /* consider it up and running */ |
| msc->msc_link_down = 0; |
| |
| /* msc send auth request */ |
| msc_send_auth_req(msc); |
| LOGP(DMSC, LOGL_ERROR, "Registered fd %d and waiting for data.\n", |
| msc->msc_connection.bfd.fd); |
| |
| return 0; |
| } |
| |
| static int msc_conn_bind(struct msc_connection *msc) |
| { |
| int rc; |
| |
| LOGP(DMSC, LOGL_NOTICE, "Going to bind and wait for connections.\n"); |
| |
| rc = osmo_sock_init_ofd(&msc->listen_fd, AF_UNSPEC, SOCK_STREAM, |
| IPPROTO_TCP, "127.0.0.1", msc->port, OSMO_SOCK_F_BIND); |
| if (rc < 0) { |
| LOGP(DMSC, LOGL_NOTICE, "Failed to bind the socket.\n"); |
| return rc; |
| } |
| |
| msc->listen_fd.data = msc; |
| msc->listen_fd.cb = msc_conn_accept; |
| |
| return 0; |
| } |