250 lines
5.7 KiB
C
250 lines
5.7 KiB
C
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/* RF Ctl handling socket */
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/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
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* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010 by On-Waves
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <openbsc/osmo_bsc_rf.h>
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#include <openbsc/debug.h>
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#include <openbsc/gsm_data.h>
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#include <osmocore/talloc.h>
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#include <osmocore/protocol/gsm_12_21.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <errno.h>
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#include <unistd.h>
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#define RF_CMD_QUERY '?'
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#define RF_CMD_OFF '0'
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#define RF_CMD_ON '1'
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static int lock_each_trx(struct gsm_network *net, int lock)
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{
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struct gsm_bts *bts;
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llist_for_each_entry(bts, &net->bts_list, list) {
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struct gsm_bts_trx *trx;
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llist_for_each_entry(trx, &bts->trx_list, list) {
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gsm_trx_lock_rf(trx, lock);
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}
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}
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return 0;
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}
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/*
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* Send a '1' when one TRX is online, otherwise send 0
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*/
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static void handle_query(struct osmo_bsc_rf_conn *conn)
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{
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struct msgb *msg;
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struct gsm_bts *bts;
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char send = RF_CMD_OFF;
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llist_for_each_entry(bts, &conn->gsm_network->bts_list, list) {
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struct gsm_bts_trx *trx;
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llist_for_each_entry(trx, &bts->trx_list, list) {
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if (trx->nm_state.availability == NM_AVSTATE_OK &&
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trx->nm_state.operational != NM_STATE_LOCKED) {
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send = RF_CMD_ON;
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break;
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}
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}
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}
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msg = msgb_alloc(10, "RF Query");
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if (!msg) {
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LOGP(DINP, LOGL_ERROR, "Failed to allocate response msg.\n");
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return;
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}
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msg->l2h = msgb_put(msg, 1);
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msg->l2h[0] = send;
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if (write_queue_enqueue(&conn->queue, msg) != 0) {
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LOGP(DINP, LOGL_ERROR, "Failed to enqueue the answer.\n");
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msgb_free(msg);
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return;
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}
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return;
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}
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static int rf_read_cmd(struct bsc_fd *fd)
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{
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struct osmo_bsc_rf_conn *conn = fd->data;
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char buf[1];
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int rc;
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rc = read(fd->fd, buf, sizeof(buf));
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if (rc != sizeof(buf)) {
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LOGP(DINP, LOGL_ERROR, "Short read %d/%s\n", errno, strerror(errno));
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bsc_unregister_fd(fd);
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close(fd->fd);
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write_queue_clear(&conn->queue);
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talloc_free(conn);
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return -1;
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}
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switch (buf[0]) {
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case RF_CMD_QUERY:
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handle_query(conn);
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break;
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case RF_CMD_OFF:
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lock_each_trx(conn->gsm_network, 1);
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break;
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case RF_CMD_ON:
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lock_each_trx(conn->gsm_network, 0);
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break;
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default:
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LOGP(DINP, LOGL_ERROR, "Unknown command %d\n", buf[0]);
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break;
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}
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return 0;
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}
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static int rf_write_cmd(struct bsc_fd *fd, struct msgb *msg)
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{
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int rc;
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rc = write(fd->fd, msg->data, msg->len);
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if (rc != msg->len) {
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LOGP(DINP, LOGL_ERROR, "Short write %d/%s\n", errno, strerror(errno));
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return -1;
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}
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return 0;
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}
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static int rf_ctl_accept(struct bsc_fd *bfd, unsigned int what)
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{
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struct osmo_bsc_rf_conn *conn;
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struct osmo_bsc_rf *rf = bfd->data;
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struct sockaddr_un addr;
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socklen_t len = sizeof(addr);
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int fd;
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fd = accept(bfd->fd, (struct sockaddr *) &addr, &len);
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if (fd < 0) {
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LOGP(DINP, LOGL_ERROR, "Failed to accept. errno: %d/%s\n",
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errno, strerror(errno));
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return -1;
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}
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conn = talloc_zero(rf, struct osmo_bsc_rf_conn);
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if (!conn) {
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LOGP(DINP, LOGL_ERROR, "Failed to allocate mem.\n");
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close(fd);
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return -1;
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}
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write_queue_init(&conn->queue, 10);
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conn->queue.bfd.data = conn;
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conn->queue.bfd.fd = fd;
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conn->queue.bfd.when = BSC_FD_READ | BSC_FD_WRITE;
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conn->queue.read_cb = rf_read_cmd;
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conn->queue.write_cb = rf_write_cmd;
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conn->gsm_network = rf->gsm_network;
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if (bsc_register_fd(&conn->queue.bfd) != 0) {
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close(fd);
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talloc_free(conn);
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return -1;
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}
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return 0;
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}
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struct osmo_bsc_rf *osmo_bsc_rf_create(const char *path, struct gsm_network *net)
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{
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unsigned int namelen;
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struct sockaddr_un local;
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struct bsc_fd *bfd;
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struct osmo_bsc_rf *rf;
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int rc;
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rf = talloc_zero(NULL, struct osmo_bsc_rf);
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if (!rf) {
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LOGP(DINP, LOGL_ERROR, "Failed to create osmo_bsc_rf.\n");
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return NULL;
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}
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bfd = &rf->listen;
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bfd->fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (bfd->fd < 0) {
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LOGP(DINP, LOGL_ERROR, "Can not create socket. %d/%s\n",
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errno, strerror(errno));
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return NULL;
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}
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local.sun_family = AF_UNIX;
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strncpy(local.sun_path, path, sizeof(local.sun_path));
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local.sun_path[sizeof(local.sun_path) - 1] = '\0';
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unlink(local.sun_path);
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/* we use the same magic that X11 uses in Xtranssock.c for
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* calculating the proper length of the sockaddr */
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#if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
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local.sun_len = strlen(local.sun_path);
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#endif
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#if defined(BSD44SOCKETS) || defined(SUN_LEN)
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namelen = SUN_LEN(&local);
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#else
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namelen = strlen(local.sun_path) +
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offsetof(struct sockaddr_un, sun_path);
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#endif
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rc = bind(bfd->fd, (struct sockaddr *) &local, namelen);
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if (rc != 0) {
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LOGP(DINP, LOGL_ERROR, "Failed to bind '%s' errno: %d/%s\n",
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local.sun_path, errno, strerror(errno));
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close(bfd->fd);
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talloc_free(rf);
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return NULL;
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}
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if (listen(bfd->fd, 0) != 0) {
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LOGP(DINP, LOGL_ERROR, "Failed to listen: %d/%s\n", errno, strerror(errno));
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close(bfd->fd);
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talloc_free(rf);
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return NULL;
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}
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bfd->when = BSC_FD_READ;
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bfd->cb = rf_ctl_accept;
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bfd->data = rf;
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if (bsc_register_fd(bfd) != 0) {
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LOGP(DINP, LOGL_ERROR, "Failed to register bfd.\n");
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close(bfd->fd);
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talloc_free(rf);
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return NULL;
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}
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rf->gsm_network = net;
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return rf;
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}
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