diff options
Diffstat (limited to 'src/libmsc/mncc_sock.c')
-rw-r--r-- | src/libmsc/mncc_sock.c | 317 |
1 files changed, 0 insertions, 317 deletions
diff --git a/src/libmsc/mncc_sock.c b/src/libmsc/mncc_sock.c deleted file mode 100644 index 0c696f2d9..000000000 --- a/src/libmsc/mncc_sock.c +++ /dev/null @@ -1,317 +0,0 @@ -/* mncc_sock.c: Tie the MNCC interface to a unix domain socket */ - -/* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org> - * (C) 2009 by Andreas Eversberg <Andreas.Eversberg@versatel.de> - * (C) 2012 by Holger Hans Peter Freyther - * 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 <stdio.h> -#include <unistd.h> -#include <stdlib.h> -#include <string.h> -#include <errno.h> -#include <assert.h> -#include <sys/socket.h> -#include <sys/un.h> - -#include <osmocom/core/talloc.h> -#include <osmocom/core/select.h> -#include <osmocom/core/socket.h> -#include <osmocom/gsm/protocol/gsm_04_08.h> - -#include <openbsc/debug.h> -#include <openbsc/mncc.h> -#include <openbsc/gsm_data.h> - -struct mncc_sock_state { - struct gsm_network *net; - struct osmo_fd listen_bfd; /* fd for listen socket */ - struct osmo_fd conn_bfd; /* fd for connection to lcr */ -}; - -/* input from CC code into mncc_sock */ -int mncc_sock_from_cc(struct gsm_network *net, struct msgb *msg) -{ - struct gsm_mncc *mncc_in = (struct gsm_mncc *) msgb_data(msg); - int msg_type = mncc_in->msg_type; - - /* Check if we currently have a MNCC handler connected */ - if (net->mncc_state->conn_bfd.fd < 0) { - LOGP(DMNCC, LOGL_ERROR, "mncc_sock receives %s for external CC app " - "but socket is gone\n", get_mncc_name(msg_type)); - if (!mncc_is_data_frame(msg_type)) { - /* release the request */ - struct gsm_mncc mncc_out; - memset(&mncc_out, 0, sizeof(mncc_out)); - mncc_out.callref = mncc_in->callref; - mncc_set_cause(&mncc_out, GSM48_CAUSE_LOC_PRN_S_LU, - GSM48_CC_CAUSE_TEMP_FAILURE); - mncc_tx_to_cc(net, MNCC_REL_REQ, &mncc_out); - } - /* free the original message */ - msgb_free(msg); - return -1; - } - - /* FIXME: check for some maximum queue depth? */ - - /* Actually enqueue the message and mark socket write need */ - msgb_enqueue(&net->upqueue, msg); - net->mncc_state->conn_bfd.when |= BSC_FD_WRITE; - return 0; -} - -static void mncc_sock_close(struct mncc_sock_state *state) -{ - struct osmo_fd *bfd = &state->conn_bfd; - - LOGP(DMNCC, LOGL_NOTICE, "MNCC Socket has LOST connection\n"); - - close(bfd->fd); - bfd->fd = -1; - osmo_fd_unregister(bfd); - - /* re-enable the generation of ACCEPT for new connections */ - state->listen_bfd.when |= BSC_FD_READ; - - /* release all exisitng calls */ - gsm0408_clear_all_trans(state->net, GSM48_PDISC_CC); - - /* flush the queue */ - while (!llist_empty(&state->net->upqueue)) { - struct msgb *msg = msgb_dequeue(&state->net->upqueue); - msgb_free(msg); - } -} - -static int mncc_sock_read(struct osmo_fd *bfd) -{ - struct mncc_sock_state *state = (struct mncc_sock_state *)bfd->data; - struct gsm_mncc *mncc_prim; - struct msgb *msg; - int rc; - - msg = msgb_alloc(sizeof(*mncc_prim)+256, "mncc_sock_rx"); - if (!msg) - return -ENOMEM; - - mncc_prim = (struct gsm_mncc *) msg->tail; - - rc = recv(bfd->fd, msg->tail, msgb_tailroom(msg), 0); - if (rc == 0) - goto close; - - if (rc < 0) { - if (errno == EAGAIN) - return 0; - goto close; - } - - rc = mncc_tx_to_cc(state->net, mncc_prim->msg_type, mncc_prim); - - /* as we always synchronously process the message in mncc_send() and - * its callbacks, we can free the message here. */ - msgb_free(msg); - - return rc; - -close: - msgb_free(msg); - mncc_sock_close(state); - return -1; -} - -static int mncc_sock_write(struct osmo_fd *bfd) -{ - struct mncc_sock_state *state = bfd->data; - struct gsm_network *net = state->net; - int rc; - - while (!llist_empty(&net->upqueue)) { - struct msgb *msg, *msg2; - struct gsm_mncc *mncc_prim; - - /* peek at the beginning of the queue */ - msg = llist_entry(net->upqueue.next, struct msgb, list); - mncc_prim = (struct gsm_mncc *)msg->data; - - bfd->when &= ~BSC_FD_WRITE; - - /* bug hunter 8-): maybe someone forgot msgb_put(...) ? */ - if (!msgb_length(msg)) { - LOGP(DMNCC, LOGL_ERROR, "message type (%d) with ZERO " - "bytes!\n", mncc_prim->msg_type); - goto dontsend; - } - - /* try to send it over the socket */ - rc = write(bfd->fd, msgb_data(msg), msgb_length(msg)); - if (rc == 0) - goto close; - if (rc < 0) { - if (errno == EAGAIN) { - bfd->when |= BSC_FD_WRITE; - break; - } - goto close; - } - -dontsend: - /* _after_ we send it, we can deueue */ - msg2 = msgb_dequeue(&net->upqueue); - assert(msg == msg2); - msgb_free(msg); - } - return 0; - -close: - mncc_sock_close(state); - - return -1; -} - -static int mncc_sock_cb(struct osmo_fd *bfd, unsigned int flags) -{ - int rc = 0; - - if (flags & BSC_FD_READ) - rc = mncc_sock_read(bfd); - if (rc < 0) - return rc; - - if (flags & BSC_FD_WRITE) - rc = mncc_sock_write(bfd); - - return rc; -} - -/** - * Send a version indication to the remote. - */ -static void queue_hello(struct mncc_sock_state *mncc) -{ - struct gsm_mncc_hello *hello; - struct msgb *msg; - - msg = msgb_alloc(512, "mncc hello"); - if (!msg) { - LOGP(DMNCC, LOGL_ERROR, "Failed to allocate hello.\n"); - mncc_sock_close(mncc); - return; - } - - hello = (struct gsm_mncc_hello *) msgb_put(msg, sizeof(*hello)); - hello->msg_type = MNCC_SOCKET_HELLO; - hello->version = MNCC_SOCK_VERSION; - hello->mncc_size = sizeof(struct gsm_mncc); - hello->data_frame_size = sizeof(struct gsm_data_frame); - hello->called_offset = offsetof(struct gsm_mncc, called); - hello->signal_offset = offsetof(struct gsm_mncc, signal); - hello->emergency_offset = offsetof(struct gsm_mncc, emergency); - - msgb_enqueue(&mncc->net->upqueue, msg); - mncc->conn_bfd.when |= BSC_FD_WRITE; -} - -/* accept a new connection */ -static int mncc_sock_accept(struct osmo_fd *bfd, unsigned int flags) -{ - struct mncc_sock_state *state = (struct mncc_sock_state *)bfd->data; - struct osmo_fd *conn_bfd = &state->conn_bfd; - struct sockaddr_un un_addr; - socklen_t len; - int rc; - - len = sizeof(un_addr); - rc = accept(bfd->fd, (struct sockaddr *) &un_addr, &len); - if (rc < 0) { - LOGP(DMNCC, LOGL_ERROR, "Failed to accept a new connection\n"); - return -1; - } - - if (conn_bfd->fd >= 0) { - LOGP(DMNCC, LOGL_NOTICE, "MNCC app connects but we already have " - "another active connection ?!?\n"); - /* We already have one MNCC app connected, this is all we support */ - state->listen_bfd.when &= ~BSC_FD_READ; - close(rc); - return 0; - } - - conn_bfd->fd = rc; - conn_bfd->when = BSC_FD_READ; - conn_bfd->cb = mncc_sock_cb; - conn_bfd->data = state; - - if (osmo_fd_register(conn_bfd) != 0) { - LOGP(DMNCC, LOGL_ERROR, "Failed to register new connection fd\n"); - close(conn_bfd->fd); - conn_bfd->fd = -1; - return -1; - } - - LOGP(DMNCC, LOGL_NOTICE, "MNCC Socket has connection with external " - "call control application\n"); - - queue_hello(state); - return 0; -} - - -int mncc_sock_init(struct gsm_network *net, const char *sock_path) -{ - struct mncc_sock_state *state; - struct osmo_fd *bfd; - int rc; - - state = talloc_zero(tall_bsc_ctx, struct mncc_sock_state); - if (!state) - return -ENOMEM; - - state->net = net; - state->conn_bfd.fd = -1; - - bfd = &state->listen_bfd; - - bfd->fd = osmo_sock_unix_init(SOCK_SEQPACKET, 0, sock_path, - OSMO_SOCK_F_BIND); - if (bfd->fd < 0) { - LOGP(DMNCC, LOGL_ERROR, "Could not create unix socket: %s: %s\n", - sock_path, strerror(errno)); - talloc_free(state); - return -1; - } - - bfd->when = BSC_FD_READ; - bfd->cb = mncc_sock_accept; - bfd->data = state; - - rc = osmo_fd_register(bfd); - if (rc < 0) { - LOGP(DMNCC, LOGL_ERROR, "Could not register listen fd: %d\n", rc); - close(bfd->fd); - talloc_free(state); - return rc; - } - - net->mncc_state = state; - - LOGP(DMNCC, LOGL_NOTICE, "MNCC socket at %s\n", sock_path); - return 0; -} |