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, *p = NULL;
  90
  91         /* find connection */
  92         for (c = service->connections; c; c = c->next)
  93         {
  94                 if (c->fd == connection->fd)
  95                 {
  96                         /* unlink connection */
  97                         if (p)
  98                                 p->next = c->next;
  99                         else
 100                                 service->connections = c->next;
 101
 102                         service->connection_closed(c);
 103                         close(c->fd);
 104
 105                         command_done(c->cmd_ctx);
 106
 107                         /* delete connection */
 108                         free(c);
 109
 110                         service->max_connections++;
 111                         break;
 112                 }
 113
 114                 /* remember the last connection for unlinking */
 115                 p = c;
 116         }
 117
 118         return ERROR_OK;
 119 }
 120
 121 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)
 122 {
 123         service_t *c, *p;
 124         int so_reuseaddr_option = 1;
 125         int oldopts;
 126
 127         c = malloc(sizeof(service_t));
 128
 129         c->name = strdup(name);
 130         c->type = type;
 131         c->port = port;
 132         c->max_connections = max_connections;
 133         c->fd = -1;
 134         c->connections = NULL;
 135         c->new_connection = new_connection_handler;
 136         c->input = input_handler;
 137         c->connection_closed = connection_closed_handler;
 138         c->priv = priv;
 139         c->next = NULL;
 140
 141         if ((c->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
 142         {
 143                 ERROR("error creating socket: %s", strerror(errno));
 144                 exit(-1);
 145         }
 146
 147         setsockopt(c->fd, SOL_SOCKET, SO_REUSEADDR, &so_reuseaddr_option, sizeof(int));
 148
 149         oldopts = fcntl(c->fd, F_GETFL, 0);
 150         fcntl(c->fd, F_SETFL, oldopts | O_NONBLOCK);
 151
 152         memset(&c->sin, 0, sizeof(c->sin));
 153         c->sin.sin_family = AF_INET;
 154         c->sin.sin_addr.s_addr = INADDR_ANY;
 155         c->sin.sin_port = htons(port);
 156
 157         if (bind(c->fd, (struct sockaddr *)&c->sin, sizeof(c->sin)) == -1)
 158         {
 159                 ERROR("couldn't bind to socket: %s", strerror(errno));
 160                 exit(-1);
 161         }
 162
 163         if (listen(c->fd, 1) == -1)
 164         {
 165                 ERROR("couldn't listen on socket: %s", strerror(errno));
 166                 exit(-1);
 167         }
 168
 169         if (services)
 170         {
 171                 for (p = services; p && p->next; p = p->next);
 172                 if (p)
 173                         p->next = c;
 174         }
 175         else
 176         {
 177                 services = c;
 178         }
 179
 180         return ERROR_OK;
 181 }
 182
 183 int remove_service(unsigned short port)
 184 {
 185         service_t *c, *p = NULL;
 186
 187         /* find service */
 188         for (c = services; c; c = c->next)
 189         {
 190                 if (c->port == port)
 191                 {
 192                         /* unlink service */
 193                         if (p)
 194                                 p->next = c->next;
 195                         else
 196                                 services = c->next;
 197
 198                         if (c->name)
 199                                 free(c->name);
 200
 201                         /* delete service */
 202                         free(c);
 203                 }
 204
 205                 /* remember the last service for unlinking */
 206                 p = c;
 207         }
 208
 209         return ERROR_OK;
 210 }
 211
 212 int server_loop(command_context_t *command_context)
 213 {
 214         service_t *service;
 215
 216         /* used in select() */
 217         fd_set read_fds;
 218         struct timeval tv;
 219         int fd_max;
 220
 221         /* used in accept() */
 222         int retval;
 223
 224         if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
 225                 ERROR("couldn't set SIGPIPE to SIG_IGN");
 226
 227         /* do regular tasks after at most 10ms */
 228         tv.tv_sec = 0;
 229         tv.tv_usec = 10000;
 230
 231         while(!shutdown_openocd)
 232         {
 233                 /* monitor sockets for acitvity */
 234                 fd_max = 0;
 235                 FD_ZERO(&read_fds);
 236
 237                 /* add service and connection fds to read_fds */
 238                 for (service = services; service; service = service->next)
 239                 {
 240                         if (service->fd != -1)
 241                         {
 242                                 /* listen for new connections */
 243                                 FD_SET(service->fd, &read_fds);
 244
 245                                 if (service->fd > fd_max)
 246                                         fd_max = service->fd;
 247                         }
 248
 249                         if (service->connections)
 250                         {
 251                                 connection_t *c;
 252
 253                                 for (c = service->connections; c; c = c->next)
 254                                 {
 255                                         /* check for activity on the connection */
 256                                         FD_SET(c->fd, &read_fds);
 257                                         if (c->fd > fd_max)
 258                                                 fd_max = c->fd;
 259                                 }
 260                         }
 261                 }
 262
 263                 /* add STDIN to read_fds */
 264                 FD_SET(fileno(stdin), &read_fds);
 265
 266                 if ((retval = select(fd_max + 1, &read_fds, NULL, NULL, &tv)) == -1)
 267                 {
 268                         if (errno == EINTR)
 269                                 FD_ZERO(&read_fds);
 270                         else
 271                         {
 272                                 ERROR("error during select: %s", strerror(errno));
 273                                 exit(-1);
 274                         }
 275                 }
 276
 277                 target_call_timer_callbacks();
 278
 279                 if (retval == 0)
 280                 {
 281                         /* do regular tasks after at most 100ms */
 282                         tv.tv_sec = 0;
 283                         tv.tv_usec = 10000;
 284
 285 #if 0
 286                         if (shutdown_openocd)
 287                                 return ERROR_COMMAND_CLOSE_CONNECTION;
 288
 289                         handle_target();
 290 #endif
 291                 }
 292
 293                 for (service = services; service; service = service->next)
 294                 {
 295                         /* handle new connections on listeners */
 296                         if ((service->fd != -1)
 297                                 && (FD_ISSET(service->fd, &read_fds)))
 298                         {
 299                                 if (service->max_connections > 0)
 300                                         add_connection(service, command_context);
 301                                 else
 302                                 {
 303                                         struct sockaddr_in sin;
 304                                         unsigned int address_size = sizeof(sin);
 305                                         int tmp_fd;
 306                                         tmp_fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
 307                                         close(tmp_fd);
 308                                         INFO("rejected '%s' connection, no more connections allowed", service->name);
 309                                 }
 310                         }
 311
 312                         /* handle activity on connections */
 313                         if (service->connections)
 314                         {
 315                                 connection_t *c;
 316
 317                                 for (c = service->connections; c;)
 318                                 {
 319                                         if ((FD_ISSET(c->fd, &read_fds)) || c->input_pending)
 320                                         {
 321                                                 if (service->input(c) != ERROR_OK)
 322                                                 {
 323                                                         connection_t *next = c->next;
 324                                                         remove_connection(service, c);
 325                                                         INFO("dropped '%s' connection", service->name);
 326                                                         c = next;
 327                                                         continue;
 328                                                 }
 329                                         }
 330                                         c = c->next;
 331                                 }
 332                         }
 333                 }
 334
 335                 if (FD_ISSET(fileno(stdin), &read_fds))
 336                 {
 337                         if (getc(stdin) == 'x')
 338                         {
 339                                 shutdown_openocd = 1;
 340                         }
 341                 }
 342         }
 343
 344         return ERROR_OK;
 345 }
 346
 347 int server_init()
 348 {
 349
 350         return ERROR_OK;
 351 }
 352
 353 int server_register_commands(command_context_t *context)
 354 {
 355         register_command(context, NULL, "shutdown", handle_shutdown_command,
 356                                          COMMAND_ANY, "shut the server down");
 357
 358         return ERROR_OK;
 359 }
 360
 361 /* tell the server we want to shut down */
 362 int handle_shutdown_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 363 {
 364         shutdown_openocd = 1;
 365
 366         return ERROR_COMMAND_CLOSE_CONNECTION;
 367 }
 368