Add simplistic telnet control interface
This might turn into a complete wire protocol with special
client software. For now it will be a simple client interface
that you can use with telnet to do certain things.
This is using flex to implement the parsing. Implementation
and more commands will follow.
diff --git a/src/telnet_interface.c b/src/telnet_interface.c
new file mode 100644
index 0000000..b0a8e43
--- /dev/null
+++ b/src/telnet_interface.c
@@ -0,0 +1,193 @@
+/* minimalistic telnet/network interface it might turn into a wire interface */
+/* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.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 <malloc.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <openbsc/telnet_interface.h>
+
+extern void telnet_parse(struct telnet_connection *connection, char *line);
+
+/* per connection data */
+LLIST_HEAD(active_connections);
+
+/* per network data */
+static int telnet_new_connection(struct bsc_fd *fd, unsigned int what);
+static struct bsc_fd server_socket = {
+ .when = BSC_FD_READ,
+ .cb = telnet_new_connection,
+ .priv_nr = 0,
+};
+
+void telnet_init(struct gsm_network *network, int port) {
+ struct sockaddr_in sock_addr;
+ int fd;
+
+ fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+
+ if (fd < 0) {
+ perror("Telnet interface socket creation failed");
+ return;
+ }
+
+ memset(&sock_addr, 0, sizeof(sock_addr));
+ sock_addr.sin_family = AF_INET;
+ sock_addr.sin_port = htons(port);
+ sock_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+
+ if (bind(fd, (struct sockaddr*)&sock_addr, sizeof(sock_addr)) < 0) {
+ perror("Telnet interface failed to bind");
+ return;
+ }
+
+ if (listen(fd, 0) < 0) {
+ perror("Telnet interface failed to listen");
+ return;
+ }
+
+ server_socket.data = network;
+ server_socket.fd = fd;
+ bsc_register_fd(&server_socket);
+}
+
+void telnet_write_help(int fd) {
+ int ret;
+ static char *msg =
+ "Help for the ad-hoc telnet command line interface\n"
+ "The generic pattern is CMD LEN DATA\\n or just CMD\n"
+ "where CMD is one of the following:\n"
+ "help\n"
+ "page IMSI (type)\n"
+ "call IMSI (number)\n"
+ "get_channel IMSI Add use count on an active channel\n"
+ "put_channel IMSI Remove use count on an active channel\n"
+ "48 IMSI 0xAB 0xEF...Send GSM 04.08\n"
+ "11 IMSI 0xAB 0xEF...Send GSM 04.11\n";
+
+ ret = write(fd, msg, strlen(msg));
+}
+
+static void print_welcome(int fd) {
+ int ret;
+ static char *msg =
+ "Welcome to the OpenBSC Control interface\n"
+ "Copyright (C) 2008, 2009 Harald Welte\n"
+ "Contributions by Daniel Willmann, Jan Lübbe, "
+ "Stefan Schmidt, Holger Freyther\n\n"
+ "License GPLv2+: GNU GPL version 2 or later "
+ "<http://gnu.org/licenses/gpl.html>\n"
+ "This is free software: you are free to change "
+ "and redistribute it.\n"
+ "There is NO WARRANTY, to the extent permitted "
+ "by law.\nType \"help\" to get a short introduction.\n";
+
+ ret = write(fd, msg, strlen(msg));
+}
+
+int telnet_close_client(struct bsc_fd *fd) {
+ struct telnet_connection *conn = (struct telnet_connection*)fd->data;
+
+ close(fd->fd);
+ bsc_unregister_fd(fd);
+ llist_del(&conn->entry);
+ free(conn);
+ return 0;
+}
+
+void telnet_error_client(int fd) {
+ int ret;
+ static char *msg = "Something went wrong. Please try again.\n";
+
+ printf("Error\n");
+ ret = write(fd, msg, strlen(msg));
+}
+
+void telnet_page(struct telnet_connection *connection, const char *imsi, int page) {
+ printf("going to page: '%s' %d\n", imsi, page);
+}
+
+void telnet_put_channel(struct telnet_connection *connection, const char *imsi) {
+ printf("put_channel: '%s'\n", imsi);
+}
+
+void telnet_get_channel(struct telnet_connection *connection, const char *imsi) {
+ printf("get_channel: '%s'\n", imsi);
+}
+
+void telnet_call(struct telnet_connection *connection, const char* imsi,
+ const char *origin) {
+ printf("calling: '%s' from: '%s'\n", imsi, origin);
+}
+
+void telnet_send_gsm_48(struct telnet_connection *connection) {
+ printf("sending gsm04.08 message\n");
+}
+
+void telnet_send_gsm_11(struct telnet_connection *connection) {
+ printf("sending gsm04.11 message\n");
+}
+
+static int client_data(struct bsc_fd *fd, unsigned int what) {
+ char buf[4096];
+ int ret;
+
+ ret = read(fd->fd, buf, sizeof(buf)-1);
+ buf[ret] = '\0';
+
+ /* connection is gone */
+ if (ret <= 0)
+ return telnet_close_client(fd);
+
+ /* time to parse. This code assumes that the input is line based */
+ telnet_parse((struct telnet_connection*)fd->data, buf);
+
+ return 0;
+}
+
+static int telnet_new_connection(struct bsc_fd *fd, unsigned int what) {
+ struct telnet_connection *connection;
+ struct sockaddr_in sockaddr;
+ socklen_t len = sizeof(sockaddr);
+ int new_connection = accept(fd->fd, (struct sockaddr*)&sockaddr, &len);
+
+ if (new_connection < 0) {
+ perror("telnet accept failed");
+ return -1;
+ }
+
+
+ connection = (struct telnet_connection*)malloc(sizeof(*connection));
+ memset(connection, 0, sizeof(*connection));
+ connection->network = (struct gsm_network*)fd->data;
+ connection->fd.data = connection;
+ connection->fd.fd = new_connection;
+ connection->fd.when = BSC_FD_READ;
+ connection->fd.cb = client_data;
+ bsc_register_fd(&connection->fd);
+ llist_add_tail(&connection->entry, &active_connections);
+
+ print_welcome(new_connection);
+
+ return 0;
+}