diff options
Diffstat (limited to 'openbsc/src/nat/bsc_nat.c')
| -rw-r--r-- | openbsc/src/nat/bsc_nat.c | 804 |
1 files changed, 804 insertions, 0 deletions
diff --git a/openbsc/src/nat/bsc_nat.c b/openbsc/src/nat/bsc_nat.c new file mode 100644 index 000000000..631d89994 --- /dev/null +++ b/openbsc/src/nat/bsc_nat.c @@ -0,0 +1,804 @@ +/* BSC Multiplexer/NAT */ + +/* + * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> + * (C) 2010 by On-Waves + * (C) 2009 by Harald Welte <laforge@gnumonks.org> + * All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> + +#include <errno.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <time.h> +#include <unistd.h> + +#define _GNU_SOURCE +#include <getopt.h> + +#include <openbsc/debug.h> +#include <openbsc/bsc_msc.h> +#include <openbsc/bsc_nat.h> +#include <openbsc/bssap.h> +#include <openbsc/ipaccess.h> +#include <openbsc/abis_nm.h> +#include <openbsc/telnet_interface.h> + +#include <osmocore/talloc.h> + +#include <vty/vty.h> + +#include <sccp/sccp.h> + +struct log_target *stderr_target; +static const char *config_file = "bsc-nat.cfg"; +static char *msc_address = "127.0.0.1"; +static struct in_addr local_addr; +static struct bsc_msc_connection *msc_con; +static struct bsc_fd bsc_listen; + + +static struct bsc_nat *nat; +static void bsc_write(struct bsc_connection *bsc, const u_int8_t *data, unsigned int length); +static void remove_bsc_connection(struct bsc_connection *connection); + +struct bsc_config *bsc_config_num(struct bsc_nat *nat, int num) +{ + struct bsc_config *conf; + + llist_for_each_entry(conf, &nat->bsc_configs, entry) + if (conf->nr == num) + return conf; + + return NULL; +} + +/* + * below are stubs we need to link + */ +int nm_state_event(enum nm_evt evt, u_int8_t obj_class, void *obj, + struct gsm_nm_state *old_state, struct gsm_nm_state *new_state) +{ + return -1; +} + +void input_event(int event, enum e1inp_sign_type type, struct gsm_bts_trx *trx) +{} + +int gsm0408_rcvmsg(struct msgb *msg, u_int8_t link_id) +{ + return -1; +} + +static void send_reset_ack(struct bsc_connection *bsc) +{ + static const u_int8_t gsm_reset_ack[] = { + 0x00, 0x13, 0xfd, + 0x09, 0x00, 0x03, 0x07, 0x0b, 0x04, 0x43, 0x01, + 0x00, 0xfe, 0x04, 0x43, 0x5c, 0x00, 0xfe, 0x03, + 0x00, 0x01, 0x31, + }; + + bsc_write(bsc, gsm_reset_ack, sizeof(gsm_reset_ack)); +} + +static void send_id_ack(struct bsc_connection *bsc) +{ + static const u_int8_t id_ack[] = { + 0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_ACK + }; + + bsc_write(bsc, id_ack, sizeof(id_ack)); +} + +static void send_id_req(struct bsc_connection *bsc) +{ + static const u_int8_t id_req[] = { + 0, 17, IPAC_PROTO_IPACCESS, 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, + }; + + bsc_write(bsc, id_req, sizeof(id_req)); +} + +static void nat_send_rlsd(struct sccp_connections *conn) +{ + struct sccp_connection_released *rel; + struct msgb *msg; + + msg = msgb_alloc_headroom(4096, 128, "rlsd"); + if (!msg) { + LOGP(DNAT, LOGL_ERROR, "Failed to allocate clear command.\n"); + return; + } + + msg->l2h = msgb_put(msg, sizeof(*rel)); + rel = (struct sccp_connection_released *) msg->l2h; + rel->type = SCCP_MSG_TYPE_RLSD; + rel->release_cause = SCCP_RELEASE_CAUSE_SCCP_FAILURE; + rel->destination_local_reference = conn->remote_ref; + rel->source_local_reference = conn->patched_ref; + + ipaccess_prepend_header(msg, IPAC_PROTO_SCCP); + + if (write_queue_enqueue(&msc_con->write_queue, msg) != 0) { + LOGP(DINP, LOGL_ERROR, "Failed to enqueue the write.\n"); + msgb_free(msg); + } +} + +static void send_mgcp_reset(struct bsc_connection *bsc) +{ + static const u_int8_t mgcp_reset[] = { + "RSIP 1 13@mgw MGCP 1.0\r\n" + }; + + bsc_write_mgcp(bsc, mgcp_reset, sizeof mgcp_reset - 1); +} + +/* + * Below is the handling of messages coming + * from the MSC and need to be forwarded to + * a real BSC. + */ +static void initialize_msc_if_needed() +{ + static int init = 0; + init = 1; + + /* do we need to send a GSM 08.08 message here? */ +} + +/* + * Currently we are lacking refcounting so we need to copy each message. + */ +static void bsc_write(struct bsc_connection *bsc, const u_int8_t *data, unsigned int length) +{ + struct msgb *msg; + + if (length > 4096) { + LOGP(DINP, LOGL_ERROR, "Can not send message of that size.\n"); + return; + } + + msg = msgb_alloc(4096, "to-bsc"); + if (!msg) { + LOGP(DINP, LOGL_ERROR, "Failed to allocate memory for BSC msg.\n"); + return; + } + + msgb_put(msg, length); + memcpy(msg->data, data, length); + if (write_queue_enqueue(&bsc->write_queue, msg) != 0) { + LOGP(DINP, LOGL_ERROR, "Failed to enqueue the write.\n"); + msgb_free(msg); + } +} + +static int forward_sccp_to_bts(struct msgb *msg) +{ + struct sccp_connections *con; + struct bsc_connection *bsc; + struct bsc_nat_parsed *parsed; + + /* filter, drop, patch the message? */ + parsed = bsc_nat_parse(msg); + if (!parsed) { + LOGP(DNAT, LOGL_ERROR, "Can not parse msg from BSC.\n"); + return -1; + } + + if (bsc_nat_filter_ipa(DIR_BSC, msg, parsed)) + goto exit; + + /* Route and modify the SCCP packet */ + if (parsed->ipa_proto == IPAC_PROTO_SCCP) { + switch (parsed->sccp_type) { + case SCCP_MSG_TYPE_UDT: + /* forward UDT messages to every BSC */ + goto send_to_all; + break; + case SCCP_MSG_TYPE_RLSD: + case SCCP_MSG_TYPE_CREF: + case SCCP_MSG_TYPE_DT1: + case SCCP_MSG_TYPE_IT: + con = patch_sccp_src_ref_to_bsc(msg, parsed, nat); + if (parsed->gsm_type == BSS_MAP_MSG_ASSIGMENT_RQST) { + if (con) { + if (bsc_mgcp_assign(con, msg) != 0) + LOGP(DNAT, LOGL_ERROR, "Failed to assign...\n"); + } else + LOGP(DNAT, LOGL_ERROR, "Assignment command but no BSC.\n"); + } + break; + case SCCP_MSG_TYPE_CC: + con = patch_sccp_src_ref_to_bsc(msg, parsed, nat); + if (!con || update_sccp_src_ref(con, parsed) != 0) + goto exit; + break; + case SCCP_MSG_TYPE_RLC: + LOGP(DNAT, LOGL_ERROR, "Unexpected release complete from MSC.\n"); + goto exit; + break; + case SCCP_MSG_TYPE_CR: + /* MSC never opens a SCCP connection, fall through */ + default: + goto exit; + } + + if (!con) + LOGP(DNAT, LOGL_ERROR, "Unknown connection for msg type: 0x%x.\n", parsed->sccp_type); + } + + talloc_free(parsed); + if (!con) + return -1; + if (!con->bsc->authenticated) { + LOGP(DNAT, LOGL_ERROR, "Selected BSC not authenticated.\n"); + return -1; + } + + bsc_write(con->bsc, msg->data, msg->len); + return 0; + +send_to_all: + /* + * Filter Paging from the network. We do not want to send a PAGING + * Command to every BSC in our network. We will analys the PAGING + * message and then send it to the authenticated messages... + */ + if (parsed->ipa_proto == IPAC_PROTO_SCCP && parsed->gsm_type == BSS_MAP_MSG_PAGING) { + bsc = bsc_nat_find_bsc(nat, msg); + if (bsc) + bsc_write(bsc, msg->data, msg->len); + else + LOGP(DNAT, LOGL_ERROR, "Could not determine BSC for paging.\n"); + + goto exit; + } + /* currently send this to every BSC connected */ + llist_for_each_entry(bsc, &nat->bsc_connections, list_entry) { + if (!bsc->authenticated) + continue; + + bsc_write(bsc, msg->data, msg->len); + } + +exit: + talloc_free(parsed); + return 0; +} + +static void msc_connection_was_lost(struct bsc_msc_connection *con) +{ + struct bsc_connection *bsc, *tmp; + + LOGP(DMSC, LOGL_ERROR, "Closing all connections downstream.\n"); + llist_for_each_entry_safe(bsc, tmp, &nat->bsc_connections, list_entry) + remove_bsc_connection(bsc); + + bsc_mgcp_free_endpoints(nat); + bsc_msc_schedule_connect(con); +} + +static int ipaccess_msc_read_cb(struct bsc_fd *bfd) +{ + int error; + struct msgb *msg = ipaccess_read_msg(bfd, &error); + struct ipaccess_head *hh; + + if (!msg) { + if (error == 0) { + LOGP(DNAT, LOGL_FATAL, "The connection the MSC was lost, exiting\n"); + bsc_msc_lost(msc_con); + return -1; + } + + LOGP(DNAT, LOGL_ERROR, "Failed to parse ip access message: %d\n", error); + return -1; + } + + LOGP(DNAT, LOGL_DEBUG, "MSG from MSC: %s proto: %d\n", 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 && msg->l2h[0] == IPAC_MSGT_ID_ACK) + initialize_msc_if_needed(); + else if (hh->proto == IPAC_PROTO_SCCP) + forward_sccp_to_bts(msg); + + msgb_free(msg); + return 0; +} + +static int ipaccess_msc_write_cb(struct bsc_fd *bfd, struct msgb *msg) +{ + int rc; + rc = write(bfd->fd, msg->data, msg->len); + + if (rc != msg->len) { + LOGP(DNAT, LOGL_ERROR, "Failed to write MSG to MSC.\n"); + return -1; + } + + return rc; +} + +/* + * Below is the handling of messages coming + * from the BSC and need to be forwarded to + * a real BSC. + */ + +/* + * Remove the connection from the connections list, + * remove it from the patching of SCCP header lists + * as well. Maybe in the future even close connection.. + */ +static void remove_bsc_connection(struct bsc_connection *connection) +{ + struct sccp_connections *sccp_patch, *tmp; + bsc_unregister_fd(&connection->write_queue.bfd); + close(connection->write_queue.bfd.fd); + write_queue_clear(&connection->write_queue); + llist_del(&connection->list_entry); + + /* stop the timeout timer */ + bsc_del_timer(&connection->id_timeout); + + /* remove all SCCP connections */ + llist_for_each_entry_safe(sccp_patch, tmp, &nat->sccp_connections, list_entry) { + if (sccp_patch->bsc != connection) + continue; + + nat_send_rlsd(sccp_patch); + sccp_connection_destroy(sccp_patch); + } + + /* close endpoints allocated by this BSC */ + bsc_mgcp_clear_endpoints_for(connection); + + talloc_free(connection); +} + +static void ipaccess_close_bsc(void *data) +{ + struct bsc_connection *conn = data; + + LOGP(DNAT, LOGL_ERROR, "BSC didn't respond to identity request. Closing.\n"); + remove_bsc_connection(conn); +} + +static void ipaccess_auth_bsc(struct tlv_parsed *tvp, struct bsc_connection *bsc) +{ + struct bsc_config *conf; + const char* token = (const char *) TLVP_VAL(tvp, IPAC_IDTAG_UNITNAME); + + llist_for_each_entry(conf, &bsc->nat->bsc_configs, entry) { + if (strcmp(conf->token, token) == 0) { + bsc->authenticated = 1; + bsc->cfg = conf; + bsc_del_timer(&bsc->id_timeout); + LOGP(DNAT, LOGL_NOTICE, "Authenticated bsc nr: %d lac: %d\n", conf->nr, conf->lac); + break; + } + } +} + +static int forward_sccp_to_msc(struct bsc_connection *bsc, struct msgb *msg) +{ + struct sccp_connections *con; + struct bsc_nat_parsed *parsed; + + /* Parse and filter messages */ + parsed = bsc_nat_parse(msg); + if (!parsed) { + LOGP(DNAT, LOGL_ERROR, "Can not parse msg from BSC.\n"); + msgb_free(msg); + return -1; + } + + if (bsc_nat_filter_ipa(DIR_MSC, msg, parsed)) + goto exit; + + /* + * check authentication after filtering to not reject auth + * responses coming from the BSC. We have to make sure that + * nothing from the exit path will forward things to the MSC + */ + if (!bsc->authenticated) { + LOGP(DNAT, LOGL_ERROR, "BSC is not authenticated.\n"); + msgb_free(msg); + return -1; + } + + + /* modify the SCCP entries */ + if (parsed->ipa_proto == IPAC_PROTO_SCCP) { + switch (parsed->sccp_type) { + case SCCP_MSG_TYPE_CR: + if (create_sccp_src_ref(bsc, msg, parsed) != 0) + goto exit2; + con = patch_sccp_src_ref_to_msc(msg, parsed, nat); + break; + case SCCP_MSG_TYPE_RLSD: + case SCCP_MSG_TYPE_CREF: + case SCCP_MSG_TYPE_DT1: + case SCCP_MSG_TYPE_CC: + case SCCP_MSG_TYPE_IT: + con = patch_sccp_src_ref_to_msc(msg, parsed, nat); + break; + case SCCP_MSG_TYPE_RLC: + con = patch_sccp_src_ref_to_msc(msg, parsed, nat); + remove_sccp_src_ref(bsc, msg, parsed); + break; + case SCCP_MSG_TYPE_UDT: + /* simply forward everything */ + con = NULL; + break; + default: + LOGP(DNAT, LOGL_ERROR, "Not forwarding to msc sccp type: 0x%x\n", parsed->sccp_type); + con = NULL; + goto exit2; + break; + } + } else if (parsed->ipa_proto == NAT_IPAC_PROTO_MGCP) { + bsc_mgcp_forward(bsc, msg); + goto exit2; + } else { + LOGP(DNAT, LOGL_ERROR, "Not forwarding unknown stream id: 0x%x\n", parsed->ipa_proto); + goto exit2; + } + + if (con && con->bsc != bsc) { + LOGP(DNAT, LOGL_ERROR, "Found the wrong entry.\n"); + goto exit2; + } + + /* send the non-filtered but maybe modified msg */ + if (write_queue_enqueue(&msc_con->write_queue, msg) != 0) { + LOGP(DNAT, LOGL_ERROR, "Can not queue message for the MSC.\n"); + msgb_free(msg); + } + talloc_free(parsed); + return 0; + +exit: + /* if we filter out the reset send an ack to the BSC */ + if (parsed->bssap == 0 && parsed->gsm_type == BSS_MAP_MSG_RESET) { + send_reset_ack(bsc); + send_reset_ack(bsc); + } else if (parsed->ipa_proto == IPAC_PROTO_IPACCESS) { + /* do we know who is handling this? */ + if (msg->l2h[0] == IPAC_MSGT_ID_RESP) { + struct tlv_parsed tvp; + ipaccess_idtag_parse(&tvp, + (unsigned char *) msg->l2h + 2, + msgb_l2len(msg) - 2); + if (TLVP_PRESENT(&tvp, IPAC_IDTAG_UNITNAME)) + ipaccess_auth_bsc(&tvp, bsc); + } + + goto exit2; + } + +exit2: + talloc_free(parsed); + msgb_free(msg); + return -1; +} + +static int ipaccess_bsc_read_cb(struct bsc_fd *bfd) +{ + int error; + struct bsc_connection *bsc = bfd->data; + struct msgb *msg = ipaccess_read_msg(bfd, &error); + + if (!msg) { + if (error == 0) { + LOGP(DNAT, LOGL_ERROR, "The connection to the BSC was lost. Cleaning it\n"); + remove_bsc_connection(bsc); + } else { + LOGP(DNAT, LOGL_ERROR, "Failed to parse ip access message: %d\n", error); + } + return -1; + } + + + LOGP(DNAT, LOGL_DEBUG, "MSG from BSC: %s proto: %d\n", hexdump(msg->data, msg->len), msg->l2h[0]); + + /* Handle messages from the BSC */ + /* FIXME: Currently no PONG is sent to the BSC */ + /* FIXME: Currently no ID ACK is sent to the BSC */ + forward_sccp_to_msc(bsc, msg); + + return 0; +} + +static int ipaccess_bsc_write_cb(struct bsc_fd *bfd, struct msgb *msg) +{ + int rc; + + rc = write(bfd->fd, msg->data, msg->len); + if (rc != msg->len) + LOGP(DNAT, LOGL_ERROR, "Failed to write message to the BSC.\n"); + + return rc; +} + +static int ipaccess_listen_bsc_cb(struct bsc_fd *bfd, unsigned int what) +{ + struct bsc_connection *bsc; + int ret; + struct sockaddr_in sa; + socklen_t sa_len = sizeof(sa); + + if (!(what & BSC_FD_READ)) + return 0; + + ret = accept(bfd->fd, (struct sockaddr *) &sa, &sa_len); + if (ret < 0) { + perror("accept"); + return ret; + } + + /* + * if we are not connected to a msc... just close the socket + */ + if (!msc_con->is_connected) { + LOGP(DNAT, LOGL_NOTICE, "Disconnecting BSC due lack of MSC connection.\n"); + close(ret); + return 0; + } + + /* todo... do something with the connection */ + /* todo... use GNUtls to see if we want to trust this as a BTS */ + + /* + * + */ + bsc = bsc_connection_alloc(nat); + if (!bsc) { + LOGP(DNAT, LOGL_ERROR, "Failed to allocate BSC struct.\n"); + close(ret); + return -1; + } + + write_queue_init(&bsc->write_queue, 100); + bsc->write_queue.bfd.data = bsc; + bsc->write_queue.bfd.fd = ret; + bsc->write_queue.read_cb = ipaccess_bsc_read_cb; + bsc->write_queue.write_cb = ipaccess_bsc_write_cb; + bsc->write_queue.bfd.when = BSC_FD_READ; + if (bsc_register_fd(&bsc->write_queue.bfd) < 0) { + LOGP(DNAT, LOGL_ERROR, "Failed to register BSC fd.\n"); + close(ret); + talloc_free(bsc); + return -2; + } + + LOGP(DNAT, LOGL_NOTICE, "Registered new BSC\n"); + llist_add(&bsc->list_entry, &nat->bsc_connections); + send_id_ack(bsc); + send_id_req(bsc); + send_mgcp_reset(bsc); + + /* + * start the hangup timer + */ + bsc->id_timeout.data = bsc; + bsc->id_timeout.cb = ipaccess_close_bsc; + bsc_schedule_timer(&bsc->id_timeout, 2, 0); + return 0; +} + +static int listen_for_bsc(struct bsc_fd *bfd, struct in_addr *in_addr, int port) +{ + struct sockaddr_in addr; + int ret, on = 1; + + bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); + bfd->cb = ipaccess_listen_bsc_cb; + bfd->when = BSC_FD_READ; + + memset(&addr, 0, sizeof(addr)); + addr.sin_family = AF_INET; + addr.sin_port = htons(port); + addr.sin_addr.s_addr = in_addr->s_addr; + + setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); + + ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr)); + if (ret < 0) { + fprintf(stderr, "Could not bind the BSC socket %s\n", + strerror(errno)); + return -EIO; + } + + ret = listen(bfd->fd, 1); + if (ret < 0) { + perror("listen"); + return ret; + } + + ret = bsc_register_fd(bfd); + if (ret < 0) { + perror("register_listen_fd"); + return ret; + } + return 0; +} + +static void print_usage() +{ + printf("Usage: bsc_nat\n"); +} + +static void print_help() +{ + printf(" Some useful help...\n"); + printf(" -h --help this text\n"); + printf(" -d option --debug=DRLL:DCC:DMM:DRR:DRSL:DNM enable debugging\n"); + printf(" -s --disable-color\n"); + printf(" -c --config-file filename The config file to use.\n"); + printf(" -m --msc=IP. The address of the MSC.\n"); + printf(" -l --local=IP. The local address of this BSC.\n"); +} + +static void handle_options(int argc, char** argv) +{ + while (1) { + int option_index = 0, c; + static struct option long_options[] = { + {"help", 0, 0, 'h'}, + {"debug", 1, 0, 'd'}, + {"config-file", 1, 0, 'c'}, + {"disable-color", 0, 0, 's'}, + {"timestamp", 0, 0, 'T'}, + {"msc", 1, 0, 'm'}, + {"local", 1, 0, 'l'}, + {0, 0, 0, 0} + }; + + c = getopt_long(argc, argv, "hd:sTPc:m:l:", + long_options, &option_index); + if (c == -1) + break; + + switch (c) { + case 'h': + print_usage(); + print_help(); + exit(0); + case 's': + log_set_use_color(stderr_target, 0); + break; + case 'd': + log_parse_category_mask(stderr_target, optarg); + break; + case 'c': + config_file = strdup(optarg); + break; + case 'T': + log_set_print_timestamp(stderr_target, 1); + break; + case 'm': + msc_address = strdup(optarg); + break; + case 'l': + inet_aton(optarg, &local_addr); + break; + default: + /* ignore */ + break; + } + } +} + +static void signal_handler(int signal) +{ + switch (signal) { + case SIGABRT: + /* in case of abort, we want to obtain a talloc report + * and then return to the caller, who will abort the process */ + case SIGUSR1: + talloc_report_full(tall_bsc_ctx, stderr); + break; + default: + break; + } +} + +int main(int argc, char** argv) +{ + log_init(&log_info); + stderr_target = log_target_create_stderr(); + log_add_target(stderr_target); + log_set_all_filter(stderr_target, 1); + + /* parse options */ + local_addr.s_addr = INADDR_ANY; + handle_options(argc, argv); + + nat = bsc_nat_alloc(); + if (!nat) { + fprintf(stderr, "Failed to allocate the BSC nat.\n"); + return -4; + } + + nat->mgcp_cfg = talloc_zero(nat, struct mgcp_config); + + /* init vty and parse */ + bsc_nat_vty_init(nat); + telnet_init(NULL, 4244); + if (mgcp_parse_config(config_file, nat->mgcp_cfg) < 0) { + fprintf(stderr, "Failed to parse the config file: '%s'\n", config_file); + return -3; + } + + /* seed the PRNG */ + srand(time(NULL)); + + /* + * Setup the MGCP code.. + */ + if (bsc_mgcp_init(nat) != 0) + return -4; + + /* connect to the MSC */ + msc_con = bsc_msc_create(msc_address, 5000); + if (!msc_con) { + fprintf(stderr, "Creating a bsc_msc_connection failed.\n"); + exit(1); + } + + msc_con->connection_loss = msc_connection_was_lost; + msc_con->write_queue.read_cb = ipaccess_msc_read_cb; + msc_con->write_queue.write_cb = ipaccess_msc_write_cb;; + bsc_msc_connect(msc_con); + + /* wait for the BSC */ + if (listen_for_bsc(&bsc_listen, &local_addr, 5000) < 0) { + fprintf(stderr, "Failed to listen for BSC.\n"); + exit(1); + } + + signal(SIGABRT, &signal_handler); + signal(SIGUSR1, &signal_handler); + signal(SIGPIPE, SIG_IGN); + + while (1) { + bsc_select_main(0); + } + + return 0; +} |