blob: d7c905518b6cc38ff1e4a43733800f56f24d1f63 [file] [log] [blame]
Harald Welte59b04682009-06-10 05:40:52 +08001/* minimalistic telnet/network interface it might turn into a wire interface */
2/* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
3 * All Rights Reserved
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 */
20
21#include <sys/socket.h>
22#include <netinet/in.h>
23#include <stdlib.h>
24#include <stdio.h>
25#include <string.h>
26#include <unistd.h>
27
28#include <openbsc/telnet_interface.h>
29#include <openbsc/gsm_subscriber.h>
30#include <openbsc/chan_alloc.h>
31#include <openbsc/gsm_04_08.h>
32#include <openbsc/gsm_04_11.h>
33#include <openbsc/msgb.h>
34#include <openbsc/abis_rsl.h>
35#include <openbsc/paging.h>
36#include <openbsc/signal.h>
Harald Weltea8379772009-06-20 22:36:41 +020037#include <openbsc/talloc.h>
Harald Welte59b04682009-06-10 05:40:52 +080038
39#include <vty/buffer.h>
40
41#define WRITE_CONNECTION(fd, msg...) \
42 int ret; \
43 char buf[4096]; \
44 snprintf(buf, sizeof(buf), msg); \
45 ret = write(fd, buf, strlen(buf));
46
47
48/* per connection data */
49LLIST_HEAD(active_connections);
50
Harald Weltea8379772009-06-20 22:36:41 +020051static void *tall_telnet_ctx;
52
Harald Welte59b04682009-06-10 05:40:52 +080053/* per network data */
54static int telnet_new_connection(struct bsc_fd *fd, unsigned int what);
Harald Welte59b04682009-06-10 05:40:52 +080055
56static struct bsc_fd server_socket = {
57 .when = BSC_FD_READ,
58 .cb = telnet_new_connection,
59 .priv_nr = 0,
60};
61
62void telnet_init(struct gsm_network *network, int port) {
63 struct sockaddr_in sock_addr;
64 int fd, on = 1;
65
Harald Weltea8379772009-06-20 22:36:41 +020066 tall_telnet_ctx = talloc_named_const(tall_bsc_ctx, 1,
67 "telnet_connection");
68
Harald Welte59b04682009-06-10 05:40:52 +080069 bsc_vty_init(network);
70
71 fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
72
73 if (fd < 0) {
74 perror("Telnet interface socket creation failed");
75 return;
76 }
77
78 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
79
80 memset(&sock_addr, 0, sizeof(sock_addr));
81 sock_addr.sin_family = AF_INET;
82 sock_addr.sin_port = htons(port);
83 sock_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
84
85 if (bind(fd, (struct sockaddr*)&sock_addr, sizeof(sock_addr)) < 0) {
86 perror("Telnet interface failed to bind");
87 return;
88 }
89
90 if (listen(fd, 0) < 0) {
91 perror("Telnet interface failed to listen");
92 return;
93 }
94
95 server_socket.data = network;
96 server_socket.fd = fd;
97 bsc_register_fd(&server_socket);
Harald Welte59b04682009-06-10 05:40:52 +080098}
99
100static void print_welcome(int fd) {
101 int ret;
102 static char *msg =
103 "Welcome to the OpenBSC Control interface\n"
104 "Copyright (C) 2008, 2009 Harald Welte\n"
105 "Contributions by Daniel Willmann, Jan Lübbe, "
106 "Stefan Schmidt, Holger Freyther\n\n"
107 "License GPLv2+: GNU GPL version 2 or later "
108 "<http://gnu.org/licenses/gpl.html>\n"
109 "This is free software: you are free to change "
110 "and redistribute it.\n"
111 "There is NO WARRANTY, to the extent permitted "
112 "by law.\nType \"help\" to get a short introduction.\n";
113
114 ret = write(fd, msg, strlen(msg));
115}
116
117int telnet_close_client(struct bsc_fd *fd) {
118 struct telnet_connection *conn = (struct telnet_connection*)fd->data;
119
120 close(fd->fd);
121 bsc_unregister_fd(fd);
122 llist_del(&conn->entry);
Harald Welte49a84052009-06-22 01:36:25 +0200123 talloc_free(conn);
Harald Welte59b04682009-06-10 05:40:52 +0800124 return 0;
125}
126
127static int client_data(struct bsc_fd *fd, unsigned int what)
128{
129 struct telnet_connection *conn = fd->data;
130 int rc = 0;
131
132 if (what & BSC_FD_READ) {
133 conn->fd.when &= ~BSC_FD_READ;
134 rc = vty_read(conn->vty);
135 }
136
Harald Welted1bc77e2009-08-07 00:31:23 +0200137 /* vty might have been closed from vithin vty_read() */
138 if (!conn->vty)
139 return rc;
140
Harald Welte59b04682009-06-10 05:40:52 +0800141 if (what & BSC_FD_WRITE) {
142 rc = buffer_flush_all(conn->vty->obuf, fd->fd);
143 if (rc == BUFFER_EMPTY)
144 conn->fd.when &= ~BSC_FD_WRITE;
145 }
146
147 return rc;
148}
149
150static int telnet_new_connection(struct bsc_fd *fd, unsigned int what) {
151 struct telnet_connection *connection;
152 struct sockaddr_in sockaddr;
153 socklen_t len = sizeof(sockaddr);
154 int new_connection = accept(fd->fd, (struct sockaddr*)&sockaddr, &len);
155
156 if (new_connection < 0) {
157 perror("telnet accept failed");
158 return -1;
159 }
160
161
Harald Welte857e00d2009-06-26 20:25:23 +0200162 connection = talloc_zero(tall_telnet_ctx, struct telnet_connection);
Harald Welte59b04682009-06-10 05:40:52 +0800163 connection->network = (struct gsm_network*)fd->data;
164 connection->fd.data = connection;
165 connection->fd.fd = new_connection;
166 connection->fd.when = BSC_FD_READ;
167 connection->fd.cb = client_data;
168 connection->bts = 0;
169 bsc_register_fd(&connection->fd);
170 llist_add_tail(&connection->entry, &active_connections);
171
172 print_welcome(new_connection);
173
174 connection->vty = vty_create(new_connection, connection);
175 if (!connection->vty)
176 return -1;
177
178 return 0;
179}
180
181/* callback from VTY code */
182void vty_event(enum event event, int sock, struct vty *vty)
183{
184 struct telnet_connection *connection = vty->priv;
185 struct bsc_fd *bfd = &connection->fd;
186
Harald Welted1bc77e2009-08-07 00:31:23 +0200187 if (vty->type != VTY_TERM)
188 return;
189
Harald Welte59b04682009-06-10 05:40:52 +0800190 switch (event) {
191 case VTY_READ:
192 bfd->when |= BSC_FD_READ;
193 break;
194 case VTY_WRITE:
195 bfd->when |= BSC_FD_WRITE;
196 break;
Harald Welted1bc77e2009-08-07 00:31:23 +0200197 case VTY_CLOSED:
198 /* vty layer is about to free() vty */
199 connection->vty = NULL;
200 telnet_close_client(bfd);
201 break;
Harald Welte59b04682009-06-10 05:40:52 +0800202 default:
203 break;
204 }
205}
206