| /* 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 <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <openbsc/telnet_interface.h> |
| #include <openbsc/gsm_subscriber.h> |
| #include <openbsc/chan_alloc.h> |
| #include <openbsc/gsm_04_08.h> |
| #include <openbsc/gsm_04_11.h> |
| #include <openbsc/msgb.h> |
| #include <openbsc/abis_rsl.h> |
| #include <openbsc/paging.h> |
| #include <openbsc/signal.h> |
| #include <openbsc/talloc.h> |
| |
| #include <vty/buffer.h> |
| |
| #define WRITE_CONNECTION(fd, msg...) \ |
| int ret; \ |
| char buf[4096]; \ |
| snprintf(buf, sizeof(buf), msg); \ |
| ret = write(fd, buf, strlen(buf)); |
| |
| |
| /* per connection data */ |
| LLIST_HEAD(active_connections); |
| |
| static void *tall_telnet_ctx; |
| |
| /* per network data */ |
| static int telnet_new_connection(struct bsc_fd *fd, unsigned int what); |
| #if 0 |
| static int telnet_paging_callback(unsigned int subsys, unsigned int signal, |
| void *handler_data, void *signal_data); |
| static int telnet_sms_callback(unsigned int subsys, unsigned int signal, |
| void *handler_data, void *signal_data); |
| #endif |
| |
| 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, on = 1; |
| |
| tall_telnet_ctx = talloc_named_const(tall_bsc_ctx, 1, |
| "telnet_connection"); |
| |
| bsc_vty_init(network); |
| |
| fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); |
| |
| if (fd < 0) { |
| perror("Telnet interface socket creation failed"); |
| return; |
| } |
| |
| setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| |
| 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); |
| |
| /* register callbacks */ |
| #if 0 |
| register_signal_handler(SS_PAGING, telnet_paging_callback, network); |
| register_signal_handler(SS_SMS, telnet_sms_callback, network); |
| #endif |
| } |
| |
| 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); |
| talloc_free(conn); |
| return 0; |
| } |
| |
| static int client_data(struct bsc_fd *fd, unsigned int what) |
| { |
| struct telnet_connection *conn = fd->data; |
| int rc = 0; |
| |
| if (what & BSC_FD_READ) { |
| conn->fd.when &= ~BSC_FD_READ; |
| rc = vty_read(conn->vty); |
| } |
| |
| /* vty might have been closed from vithin vty_read() */ |
| if (!conn->vty) |
| return rc; |
| |
| if (what & BSC_FD_WRITE) { |
| rc = buffer_flush_all(conn->vty->obuf, fd->fd); |
| if (rc == BUFFER_EMPTY) |
| conn->fd.when &= ~BSC_FD_WRITE; |
| } |
| |
| return rc; |
| } |
| |
| 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 = talloc_zero(tall_telnet_ctx, struct telnet_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; |
| connection->bts = 0; |
| bsc_register_fd(&connection->fd); |
| llist_add_tail(&connection->entry, &active_connections); |
| |
| print_welcome(new_connection); |
| |
| connection->vty = vty_create(new_connection, connection); |
| if (!connection->vty) |
| return -1; |
| |
| return 0; |
| } |
| |
| /* callback from VTY code */ |
| void vty_event(enum event event, int sock, struct vty *vty) |
| { |
| struct telnet_connection *connection = vty->priv; |
| struct bsc_fd *bfd = &connection->fd; |
| |
| if (vty->type != VTY_TERM) |
| return; |
| |
| switch (event) { |
| case VTY_READ: |
| bfd->when |= BSC_FD_READ; |
| break; |
| case VTY_WRITE: |
| bfd->when |= BSC_FD_WRITE; |
| break; |
| case VTY_CLOSED: |
| /* vty layer is about to free() vty */ |
| connection->vty = NULL; |
| telnet_close_client(bfd); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| #if 0 |
| static int telnet_paging_callback(unsigned int subsys, unsigned int singal, |
| void *handler_data, void *signal_data) |
| { |
| struct paging_signal_data *paging = signal_data; |
| struct telnet_connection *con; |
| |
| llist_for_each_entry(con, &active_connections, entry) { |
| if (paging->lchan) { |
| WRITE_CONNECTION(con->fd.fd, "Paging succeeded\n"); |
| show_lchan(con->fd.fd, paging->lchan); |
| } else { |
| WRITE_CONNECTION(con->fd.fd, "Paging failed for subscriber: %s/%s/%s\n", |
| paging->subscr->imsi, |
| paging->subscr->tmsi, |
| paging->subscr->name); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int telnet_sms_callback(unsigned int subsys, unsigned int signal, |
| void *handler_data, void *signal_data) |
| { |
| struct sms_submit *sms = signal_data; |
| struct telnet_connection *con; |
| |
| llist_for_each_entry(con, &active_connections, entry) { |
| WRITE_CONNECTION(con->fd.fd, "Incoming SMS: %s\n", sms->user_data); |
| } |
| |
| return 0; |
| } |
| #endif |