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   1 /***************************************************************************
   2  *   Copyright (C) 2014 by Franck Jullien                                  *
   3  *   franck.jullien@gmail.com                                              *
   4  *                                                                         *
   5  *   Based on ./src/server/telnet_server.c                                 *
   6  *                                                                         *
   7  *   This program is free software; you can redistribute it and/or modify  *
   8  *   it under the terms of the GNU General Public License as published by  *
   9  *   the Free Software Foundation; either version 2 of the License, or     *
  10  *   (at your option) any later version.                                   *
  11  *                                                                         *
  12  *   This program is distributed in the hope that it will be useful,       *
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  15  *   GNU General Public License for more details.                          *
  16  *                                                                         *
  17  *   You should have received a copy of the GNU General Public License     *
  18  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  19  ***************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include <server/telnet_server.h>
  26
  27 #include "or1k_tap.h"
  28 #include "or1k_du.h"
  29 #include "jsp_server.h"
  30
  31 static char *jsp_port;
  32
  33 /**A skim of the relevant RFCs suggests that if my application simply sent the
  34  * characters IAC DONT LINEMODE (\377\376\042) as soon as the client connects,
  35  * the client should be forced into character mode. However it doesn't make any difference.
  36  */
  37
  38 static const char * const negotiate =
  39         "\xFF\xFB\x03"                  /* IAC WILL Suppress Go Ahead */
  40         "\xFF\xFB\x01"                  /* IAC WILL Echo */
  41         "\xFF\xFD\x03"                  /* IAC DO Suppress Go Ahead */
  42         "\xFF\xFE\x01";                 /* IAC DON'T Echo */
  43
  44 /* The only way we can detect that the socket is closed is the first time
  45  * we write to it, we will fail. Subsequent write operations will
  46  * succeed. Shudder!
  47  */
  48 static int telnet_write(struct connection *connection, const void *data, int len)
  49 {
  50         struct telnet_connection *t_con = connection->priv;
  51         if (t_con->closed)
  52                 return ERROR_SERVER_REMOTE_CLOSED;
  53
  54         if (connection_write(connection, data, len) == len)
  55                 return ERROR_OK;
  56         t_con->closed = 1;
  57         return ERROR_SERVER_REMOTE_CLOSED;
  58 }
  59
  60 static int jsp_poll_read(void *priv)
  61 {
  62         struct jsp_service *jsp_service = (struct jsp_service *)priv;
  63         unsigned char out_buffer[10];
  64         unsigned char in_buffer[10];
  65         int out_len = 0;
  66         int in_len;
  67
  68         if (!jsp_service->connection)
  69                 return ERROR_FAIL;
  70
  71         memset(out_buffer, 0, 10);
  72
  73         or1k_adv_jtag_jsp_xfer(jsp_service->jtag_info, &out_len, out_buffer, &in_len, in_buffer);
  74         if (in_len)
  75                 telnet_write(jsp_service->connection, in_buffer, in_len);
  76
  77         return ERROR_OK;
  78 }
  79
  80 static int jsp_new_connection(struct connection *connection)
  81 {
  82         struct telnet_connection *telnet_connection = malloc(sizeof(struct telnet_connection));
  83         struct jsp_service *jsp_service = connection->service->priv;
  84
  85         connection->priv = telnet_connection;
  86
  87         /* initialize telnet connection information */
  88         telnet_connection->closed = 0;
  89         telnet_connection->line_size = 0;
  90         telnet_connection->line_cursor = 0;
  91         telnet_connection->state = TELNET_STATE_DATA;
  92
  93         /* negotiate telnet options */
  94         telnet_write(connection, negotiate, strlen(negotiate));
  95
  96         /* print connection banner */
  97         if (jsp_service->banner) {
  98                 telnet_write(connection, jsp_service->banner, strlen(jsp_service->banner));
  99                 telnet_write(connection, "\r\n", 2);
 100         }
 101
 102         jsp_service->connection = connection;
 103
 104         int retval = target_register_timer_callback(&jsp_poll_read, 1,
 105                 TARGET_TIMER_TYPE_PERIODIC, jsp_service);
 106         if (retval != ERROR_OK)
 107                 return retval;
 108
 109         return ERROR_OK;
 110 }
 111
 112 static int jsp_input(struct connection *connection)
 113 {
 114         int bytes_read;
 115         unsigned char buffer[TELNET_BUFFER_SIZE];
 116         unsigned char *buf_p;
 117         struct telnet_connection *t_con = connection->priv;
 118         struct jsp_service *jsp_service = connection->service->priv;
 119
 120         bytes_read = connection_read(connection, buffer, TELNET_BUFFER_SIZE);
 121
 122         if (bytes_read == 0)
 123                 return ERROR_SERVER_REMOTE_CLOSED;
 124         else if (bytes_read == -1) {
 125                 LOG_ERROR("error during read: %s", strerror(errno));
 126                 return ERROR_SERVER_REMOTE_CLOSED;
 127         }
 128
 129         buf_p = buffer;
 130         while (bytes_read) {
 131                 switch (t_con->state) {
 132                         case TELNET_STATE_DATA:
 133                                 if (*buf_p == 0xff)
 134                                         t_con->state = TELNET_STATE_IAC;
 135                                 else {
 136                                         int out_len = 1;
 137                                         int in_len;
 138                                         unsigned char in_buffer[10];
 139                                         or1k_adv_jtag_jsp_xfer(jsp_service->jtag_info,
 140                                                                &out_len, buf_p, &in_len,
 141                                                                in_buffer);
 142                                         if (in_len)
 143                                                 telnet_write(connection,
 144                                                              in_buffer, in_len);
 145                                 }
 146                                 break;
 147                         case TELNET_STATE_IAC:
 148                                 switch (*buf_p) {
 149                                 case 0xfe:
 150                                         t_con->state = TELNET_STATE_DONT;
 151                                         break;
 152                                 case 0xfd:
 153                                         t_con->state = TELNET_STATE_DO;
 154                                         break;
 155                                 case 0xfc:
 156                                         t_con->state = TELNET_STATE_WONT;
 157                                         break;
 158                                 case 0xfb:
 159                                         t_con->state = TELNET_STATE_WILL;
 160                                         break;
 161                                 }
 162                                 break;
 163                         case TELNET_STATE_SB:
 164                                 break;
 165                         case TELNET_STATE_SE:
 166                                 break;
 167                         case TELNET_STATE_WILL:
 168                         case TELNET_STATE_WONT:
 169                         case TELNET_STATE_DO:
 170                         case TELNET_STATE_DONT:
 171                                 t_con->state = TELNET_STATE_DATA;
 172                                 break;
 173                         default:
 174                                 LOG_ERROR("unknown telnet state");
 175                                 exit(-1);
 176                 }
 177
 178                 bytes_read--;
 179                 buf_p++;
 180         }
 181
 182         return ERROR_OK;
 183 }
 184
 185 static int jsp_connection_closed(struct connection *connection)
 186 {
 187         struct jsp_service *jsp_service = connection->service->priv;
 188
 189         int retval = target_unregister_timer_callback(&jsp_poll_read, jsp_service);
 190         if (retval != ERROR_OK)
 191                 return retval;
 192
 193         free(connection->priv);
 194         connection->priv = NULL;
 195         return ERROR_OK;
 196 }
 197
 198 static const struct service_driver jsp_service_driver = {
 199         .name = "jsp",
 200         .new_connection_during_keep_alive_handler = NULL,
 201         .new_connection_handler = jsp_new_connection,
 202         .input_handler = jsp_input,
 203         .connection_closed_handler = jsp_connection_closed,
 204         .keep_client_alive_handler = NULL,
 205 };
 206
 207 int jsp_init(struct or1k_jtag *jtag_info, char *banner)
 208 {
 209         struct jsp_service *jsp_service = malloc(sizeof(struct jsp_service));
 210         jsp_service->banner = banner;
 211         jsp_service->jtag_info = jtag_info;
 212
 213         return add_service(&jsp_service_driver, jsp_port, 1, jsp_service);
 214 }
 215
 216 COMMAND_HANDLER(handle_jsp_port_command)
 217 {
 218         return CALL_COMMAND_HANDLER(server_pipe_command, &jsp_port);
 219 }
 220
 221 static const struct command_registration jsp_command_handlers[] = {
 222         {
 223                 .name = "jsp_port",
 224                 .handler = handle_jsp_port_command,
 225                 .mode = COMMAND_ANY,
 226                 .help = "Specify port on which to listen "
 227                         "for incoming JSP telnet connections.",
 228                 .usage = "[port_num]",
 229         },
 230         COMMAND_REGISTRATION_DONE
 231 };
 232
 233 int jsp_register_commands(struct command_context *cmd_ctx)
 234 {
 235         jsp_port = strdup("7777");
 236         return register_commands(cmd_ctx, NULL, jsp_command_handlers);
 237 }
 238
 239 void jsp_service_free(void)
 240 {
 241         free(jsp_port);
 242 }