194 lines
5.3 KiB
C
194 lines
5.3 KiB
C
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/* 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 <malloc.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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extern void telnet_parse(struct telnet_connection *connection, char *line);
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/* per connection data */
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LLIST_HEAD(active_connections);
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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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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;
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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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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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}
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void telnet_write_help(int fd) {
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int ret;
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static char *msg =
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"Help for the ad-hoc telnet command line interface\n"
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"The generic pattern is CMD LEN DATA\\n or just CMD\n"
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"where CMD is one of the following:\n"
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"help\n"
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"page IMSI (type)\n"
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"call IMSI (number)\n"
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"get_channel IMSI Add use count on an active channel\n"
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"put_channel IMSI Remove use count on an active channel\n"
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"48 IMSI 0xAB 0xEF...Send GSM 04.08\n"
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"11 IMSI 0xAB 0xEF...Send GSM 04.11\n";
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ret = write(fd, msg, strlen(msg));
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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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free(conn);
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return 0;
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}
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void telnet_error_client(int fd) {
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int ret;
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static char *msg = "Something went wrong. Please try again.\n";
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printf("Error\n");
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ret = write(fd, msg, strlen(msg));
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}
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void telnet_page(struct telnet_connection *connection, const char *imsi, int page) {
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printf("going to page: '%s' %d\n", imsi, page);
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}
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void telnet_put_channel(struct telnet_connection *connection, const char *imsi) {
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printf("put_channel: '%s'\n", imsi);
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}
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void telnet_get_channel(struct telnet_connection *connection, const char *imsi) {
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printf("get_channel: '%s'\n", imsi);
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}
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void telnet_call(struct telnet_connection *connection, const char* imsi,
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const char *origin) {
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printf("calling: '%s' from: '%s'\n", imsi, origin);
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}
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void telnet_send_gsm_48(struct telnet_connection *connection) {
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printf("sending gsm04.08 message\n");
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}
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void telnet_send_gsm_11(struct telnet_connection *connection) {
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printf("sending gsm04.11 message\n");
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}
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static int client_data(struct bsc_fd *fd, unsigned int what) {
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char buf[4096];
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int ret;
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ret = read(fd->fd, buf, sizeof(buf)-1);
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buf[ret] = '\0';
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/* connection is gone */
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if (ret <= 0)
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return telnet_close_client(fd);
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/* time to parse. This code assumes that the input is line based */
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telnet_parse((struct telnet_connection*)fd->data, buf);
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return 0;
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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 = (struct telnet_connection*)malloc(sizeof(*connection));
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memset(connection, 0, sizeof(*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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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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return 0;
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}
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