src/server/server.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   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     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #include "server.h"
  21
  22 #include "log.h"
  23 #include "telnet_server.h"
  24 #include "target.h"
  25
  26 #include <command.h>
  27 #include <string.h>
  28 #include <stdlib.h>
  29 #include <errno.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33 #include <fcntl.h>
  34 #include <signal.h>
  35
  36 service_t *services = NULL;
  37
  38 /* shutdown_openocd == 1: exit the main event loop, and quit the debugger */
  39 static int shutdown_openocd = 0;
  40 int handle_shutdown_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  41
  42 int add_connection(service_t *service, command_context_t *cmd_ctx)
  43 {
  44         unsigned int address_size;
  45         connection_t *c, *p;
  46         int retval;
  47
  48         c = malloc(sizeof(connection_t));
  49         c->fd = -1;
  50         memset(&c->sin, 0, sizeof(c->sin));
  51         c->cmd_ctx = copy_command_context(cmd_ctx);
  52         c->service = service;
  53         c->input_pending = 0;
  54         c->priv = NULL;
  55         c->next = NULL;
  56
  57         address_size = sizeof(c->sin);
  58         c->fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
  59
  60         if ((retval = service->new_connection(c)) == ERROR_OK)
  61         {
  62                 INFO("accepted '%s' connection from %i", service->name, c->sin.sin_port);
  63         }
  64         else
  65         {
  66                 close(c->fd);
  67                 INFO("attempted '%s' connection rejected", service->name);
  68                 free(c);
  69         }
  70
  71         if (service->connections)
  72         {
  73                 for (p = service->connections; p && p->next; p = p->next);
  74                 if (p)
  75                         p->next = c;
  76         }
  77         else
  78         {
  79                 service->connections = c;
  80         }
  81
  82         service->max_connections--;
  83
  84         return ERROR_OK;
  85 }
  86
  87 int remove_connection(service_t *service, connection_t *connection)
  88 {
  89         connection_t *c = service->connections;
  90
  91         /* find connection */
  92         while(c)
  93         {
  94                 connection_t *next = c->next;
  95
  96                 if (c->fd == connection->fd)
  97                 {
  98                         service->connections = next;
  99                         service->connection_closed(c);
 100                         close(c->fd);
 101
 102                         command_done(c->cmd_ctx);
 103
 104                         /* delete connection */
 105                         free(c);
 106
 107                         service->max_connections++;
 108                         break;
 109                 }
 110
 111                 /* remember the last connection for unlinking */
 112                 c = next;
 113         }
 114
 115         return ERROR_OK;
 116 }
 117
 118 int add_service(char *name, enum connection_type type, unsigned short port, int max_connections, new_connection_handler_t new_connection_handler, input_handler_t input_handler, connection_closed_handler_t connection_closed_handler, void *priv)
 119 {
 120         service_t *c, *p;
 121         int so_reuseaddr_option = 1;
 122         int oldopts;
 123
 124         c = malloc(sizeof(service_t));
 125
 126         c->name = strdup(name);
 127         c->type = type;
 128         c->port = port;
 129         c->max_connections = max_connections;
 130         c->fd = -1;
 131         c->connections = NULL;
 132         c->new_connection = new_connection_handler;
 133         c->input = input_handler;
 134         c->connection_closed = connection_closed_handler;
 135         c->priv = priv;
 136         c->next = NULL;
 137
 138         if ((c->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
 139         {
 140                 ERROR("error creating socket: %s", strerror(errno));
 141                 exit(-1);
 142         }
 143
 144         setsockopt(c->fd, SOL_SOCKET, SO_REUSEADDR, &so_reuseaddr_option, sizeof(int));
 145
 146         oldopts = fcntl(c->fd, F_GETFL, 0);
 147         fcntl(c->fd, F_SETFL, oldopts | O_NONBLOCK);
 148
 149         memset(&c->sin, 0, sizeof(c->sin));
 150         c->sin.sin_family = AF_INET;
 151         c->sin.sin_addr.s_addr = INADDR_ANY;
 152         c->sin.sin_port = htons(port);
 153
 154         if (bind(c->fd, (struct sockaddr *)&c->sin, sizeof(c->sin)) == -1)
 155         {
 156                 ERROR("couldn't bind to socket: %s", strerror(errno));
 157                 exit(-1);
 158         }
 159
 160         if (listen(c->fd, 1) == -1)
 161         {
 162                 ERROR("couldn't listen on socket: %s", strerror(errno));
 163                 exit(-1);
 164         }
 165
 166         if (services)
 167         {
 168                 for (p = services; p && p->next; p = p->next);
 169                 if (p)
 170                         p->next = c;
 171         }
 172         else
 173         {
 174                 services = c;
 175         }
 176
 177         return ERROR_OK;
 178 }
 179
 180 int remove_service(unsigned short port)
 181 {
 182         service_t *c = services;
 183
 184         /* find service */
 185         while(c)
 186         {
 187                 service_t *next = c->next;
 188
 189                 if (c->port == port)
 190                 {
 191                         if (c->name)
 192                                 free(c->name);
 193
 194                         if (c->priv)
 195                                 free(c->priv);
 196
 197                         /* delete service */
 198                         free(c);
 199                 }
 200
 201                 /* remember the last service for unlinking */
 202                 c = next;
 203         }
 204
 205         return ERROR_OK;
 206 }
 207
 208 int server_loop(command_context_t *command_context)
 209 {
 210         service_t *service;
 211
 212         /* used in select() */
 213         fd_set read_fds;
 214         struct timeval tv;
 215         int fd_max;
 216
 217         /* used in accept() */
 218         int retval;
 219
 220         if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
 221                 ERROR("couldn't set SIGPIPE to SIG_IGN");
 222
 223         /* do regular tasks after at most 10ms */
 224         tv.tv_sec = 0;
 225         tv.tv_usec = 10000;
 226
 227         while(!shutdown_openocd)
 228         {
 229                 /* monitor sockets for acitvity */
 230                 fd_max = 0;
 231                 FD_ZERO(&read_fds);
 232
 233                 /* add service and connection fds to read_fds */
 234                 for (service = services; service; service = service->next)
 235                 {
 236                         if (service->fd != -1)
 237                         {
 238                                 /* listen for new connections */
 239                                 FD_SET(service->fd, &read_fds);
 240
 241                                 if (service->fd > fd_max)
 242                                         fd_max = service->fd;
 243                         }
 244
 245                         if (service->connections)
 246                         {
 247                                 connection_t *c;
 248
 249                                 for (c = service->connections; c; c = c->next)
 250                                 {
 251                                         /* check for activity on the connection */
 252                                         FD_SET(c->fd, &read_fds);
 253                                         if (c->fd > fd_max)
 254                                                 fd_max = c->fd;
 255                                 }
 256                         }
 257                 }
 258
 259                 /* add STDIN to read_fds */
 260                 FD_SET(fileno(stdin), &read_fds);
 261
 262                 if ((retval = select(fd_max + 1, &read_fds, NULL, NULL, &tv)) == -1)
 263                 {
 264                         if (errno == EINTR)
 265                                 FD_ZERO(&read_fds);
 266                         else
 267                         {
 268                                 ERROR("error during select: %s", strerror(errno));
 269                                 exit(-1);
 270                         }
 271                 }
 272
 273                 target_call_timer_callbacks();
 274
 275                 if (retval == 0)
 276                 {
 277                         /* do regular tasks after at most 100ms */
 278                         tv.tv_sec = 0;
 279                         tv.tv_usec = 10000;
 280
 281 #if 0
 282                         if (shutdown_openocd)
 283                                 return ERROR_COMMAND_CLOSE_CONNECTION;
 284
 285                         handle_target();
 286 #endif
 287                 }
 288
 289                 for (service = services; service; service = service->next)
 290                 {
 291                         /* handle new connections on listeners */
 292                         if ((service->fd != -1)
 293                                 && (FD_ISSET(service->fd, &read_fds)))
 294                         {
 295                                 if (service->max_connections > 0)
 296                                         add_connection(service, command_context);
 297                                 else
 298                                 {
 299                                         struct sockaddr_in sin;
 300                                         unsigned int address_size = sizeof(sin);
 301                                         int tmp_fd;
 302                                         tmp_fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
 303                                         close(tmp_fd);
 304                                         INFO("rejected '%s' connection, no more connections allowed", service->name);
 305                                 }
 306                         }
 307
 308                         /* handle activity on connections */
 309                         if (service->connections)
 310                         {
 311                                 connection_t *c;
 312
 313                                 for (c = service->connections; c;)
 314                                 {
 315                                         if ((FD_ISSET(c->fd, &read_fds)) || c->input_pending)
 316                                         {
 317                                                 if (service->input(c) != ERROR_OK)
 318                                                 {
 319                                                         connection_t *next = c->next;
 320                                                         remove_connection(service, c);
 321                                                         INFO("dropped '%s' connection", service->name);
 322                                                         c = next;
 323                                                         continue;
 324                                                 }
 325                                         }
 326                                         c = c->next;
 327                                 }
 328                         }
 329                 }
 330
 331                 if (FD_ISSET(fileno(stdin), &read_fds))
 332                 {
 333                         if (getc(stdin) == 'x')
 334                         {
 335                                 shutdown_openocd = 1;
 336                         }
 337                 }
 338         }
 339
 340         return ERROR_OK;
 341 }
 342
 343 int server_init()
 344 {
 345
 346         return ERROR_OK;
 347 }
 348
 349 int server_register_commands(command_context_t *context)
 350 {
 351         register_command(context, NULL, "shutdown", handle_shutdown_command,
 352                                          COMMAND_ANY, "shut the server down");
 353
 354         return ERROR_OK;
 355 }
 356
 357 /* tell the server we want to shut down */
 358 int handle_shutdown_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 359 {
 360         shutdown_openocd = 1;
 361
 362         return ERROR_COMMAND_CLOSE_CONNECTION;
 363 }
 364