242 lines
6.2 KiB
C
242 lines
6.2 KiB
C
/* minimalistic telnet/network interface it might turn into a wire interface */
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/* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
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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 <sys/socket.h>
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#include <netinet/in.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <openbsc/telnet_interface.h>
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#include <openbsc/gsm_subscriber.h>
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#include <openbsc/chan_alloc.h>
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#include <openbsc/gsm_04_08.h>
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#include <openbsc/gsm_04_11.h>
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#include <openbsc/msgb.h>
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#include <openbsc/abis_rsl.h>
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#include <openbsc/paging.h>
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#include <openbsc/signal.h>
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#include <openbsc/talloc.h>
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#include <vty/buffer.h>
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#define WRITE_CONNECTION(fd, msg...) \
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int ret; \
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char buf[4096]; \
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snprintf(buf, sizeof(buf), msg); \
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ret = write(fd, buf, strlen(buf));
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/* per connection data */
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LLIST_HEAD(active_connections);
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static void *tall_telnet_ctx;
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/* per network data */
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static int telnet_new_connection(struct bsc_fd *fd, unsigned int what);
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#if 0
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static int telnet_paging_callback(unsigned int subsys, unsigned int signal,
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void *handler_data, void *signal_data);
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static int telnet_sms_callback(unsigned int subsys, unsigned int signal,
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void *handler_data, void *signal_data);
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#endif
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static struct bsc_fd server_socket = {
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.when = BSC_FD_READ,
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.cb = telnet_new_connection,
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.priv_nr = 0,
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};
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void telnet_init(struct gsm_network *network, int port) {
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struct sockaddr_in sock_addr;
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int fd, on = 1;
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tall_telnet_ctx = talloc_named_const(tall_bsc_ctx, 1,
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"telnet_connection");
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bsc_vty_init(network);
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fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
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if (fd < 0) {
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perror("Telnet interface socket creation failed");
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return;
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}
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setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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memset(&sock_addr, 0, sizeof(sock_addr));
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sock_addr.sin_family = AF_INET;
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sock_addr.sin_port = htons(port);
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sock_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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if (bind(fd, (struct sockaddr*)&sock_addr, sizeof(sock_addr)) < 0) {
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perror("Telnet interface failed to bind");
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return;
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}
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if (listen(fd, 0) < 0) {
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perror("Telnet interface failed to listen");
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return;
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}
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server_socket.data = network;
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server_socket.fd = fd;
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bsc_register_fd(&server_socket);
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/* register callbacks */
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#if 0
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register_signal_handler(SS_PAGING, telnet_paging_callback, network);
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register_signal_handler(SS_SMS, telnet_sms_callback, network);
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#endif
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}
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static void print_welcome(int fd) {
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int ret;
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static char *msg =
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"Welcome to the OpenBSC Control interface\n"
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"Copyright (C) 2008, 2009 Harald Welte\n"
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"Contributions by Daniel Willmann, Jan Lübbe, "
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"Stefan Schmidt, Holger Freyther\n\n"
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"License GPLv2+: GNU GPL version 2 or later "
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"<http://gnu.org/licenses/gpl.html>\n"
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"This is free software: you are free to change "
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"and redistribute it.\n"
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"There is NO WARRANTY, to the extent permitted "
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"by law.\nType \"help\" to get a short introduction.\n";
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ret = write(fd, msg, strlen(msg));
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}
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int telnet_close_client(struct bsc_fd *fd) {
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struct telnet_connection *conn = (struct telnet_connection*)fd->data;
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close(fd->fd);
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bsc_unregister_fd(fd);
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llist_del(&conn->entry);
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talloc_free(conn);
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return 0;
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}
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static int client_data(struct bsc_fd *fd, unsigned int what)
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{
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struct telnet_connection *conn = fd->data;
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int rc = 0;
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if (what & BSC_FD_READ) {
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conn->fd.when &= ~BSC_FD_READ;
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rc = vty_read(conn->vty);
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}
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if (what & BSC_FD_WRITE) {
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rc = buffer_flush_all(conn->vty->obuf, fd->fd);
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if (rc == BUFFER_EMPTY)
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conn->fd.when &= ~BSC_FD_WRITE;
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}
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return rc;
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}
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static int telnet_new_connection(struct bsc_fd *fd, unsigned int what) {
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struct telnet_connection *connection;
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struct sockaddr_in sockaddr;
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socklen_t len = sizeof(sockaddr);
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int new_connection = accept(fd->fd, (struct sockaddr*)&sockaddr, &len);
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if (new_connection < 0) {
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perror("telnet accept failed");
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return -1;
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}
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connection = talloc_zero(tall_telnet_ctx, struct telnet_connection);
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connection->network = (struct gsm_network*)fd->data;
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connection->fd.data = connection;
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connection->fd.fd = new_connection;
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connection->fd.when = BSC_FD_READ;
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connection->fd.cb = client_data;
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connection->bts = 0;
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bsc_register_fd(&connection->fd);
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llist_add_tail(&connection->entry, &active_connections);
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print_welcome(new_connection);
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connection->vty = vty_create(new_connection, connection);
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if (!connection->vty)
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return -1;
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return 0;
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}
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/* callback from VTY code */
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void vty_event(enum event event, int sock, struct vty *vty)
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{
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struct telnet_connection *connection = vty->priv;
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struct bsc_fd *bfd = &connection->fd;
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switch (event) {
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case VTY_READ:
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bfd->when |= BSC_FD_READ;
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break;
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case VTY_WRITE:
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bfd->when |= BSC_FD_WRITE;
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break;
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default:
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break;
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}
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}
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#if 0
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static int telnet_paging_callback(unsigned int subsys, unsigned int singal,
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void *handler_data, void *signal_data)
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{
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struct paging_signal_data *paging = signal_data;
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struct telnet_connection *con;
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llist_for_each_entry(con, &active_connections, entry) {
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if (paging->lchan) {
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WRITE_CONNECTION(con->fd.fd, "Paging succeeded\n");
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show_lchan(con->fd.fd, paging->lchan);
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} else {
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WRITE_CONNECTION(con->fd.fd, "Paging failed for subscriber: %s/%s/%s\n",
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paging->subscr->imsi,
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paging->subscr->tmsi,
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paging->subscr->name);
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}
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}
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return 0;
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}
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static int telnet_sms_callback(unsigned int subsys, unsigned int signal,
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void *handler_data, void *signal_data)
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{
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struct sms_submit *sms = signal_data;
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struct telnet_connection *con;
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llist_for_each_entry(con, &active_connections, entry) {
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WRITE_CONNECTION(con->fd.fd, "Incoming SMS: %s\n", sms->user_data);
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}
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return 0;
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}
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#endif
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