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 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "replacements.h"
  25
  26 #include "server.h"
  27
  28 #include "log.h"
  29 #include "telnet_server.h"
  30 #include "target.h"
  31
  32 #include <command.h>
  33 #include <string.h>
  34 #include <stdlib.h>
  35 #include <errno.h>
  36 #include <unistd.h>
  37 #include <sys/types.h>
  38 #include <fcntl.h>
  39 #include <signal.h>
  40 #ifndef _WIN32
  41 #include <netinet/tcp.h>
  42 #endif
  43
  44 service_t *services = NULL;
  45
  46 /* shutdown_openocd == 1: exit the main event loop, and quit the debugger */
  47 static int shutdown_openocd = 0;
  48 int handle_shutdown_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
  49
  50 int add_connection(service_t *service, command_context_t *cmd_ctx)
  51 {
  52         unsigned int address_size;
  53         connection_t *c, **p;
  54         int retval;
  55         int flag=1;
  56
  57         c = malloc(sizeof(connection_t));
  58         c->fd = -1;
  59         memset(&c->sin, 0, sizeof(c->sin));
  60         c->cmd_ctx = copy_command_context(cmd_ctx);
  61         c->service = service;
  62         c->input_pending = 0;
  63         c->priv = NULL;
  64         c->next = NULL;
  65
  66         address_size = sizeof(c->sin);
  67
  68         c->fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
  69
  70         /* This increases performance dramatically for e.g. GDB load which
  71          * does not have a sliding window protocol. */
  72         retval=setsockopt(c->fd,        /* socket affected */
  73                         IPPROTO_TCP,            /* set option at TCP level */
  74                         TCP_NODELAY,            /* name of option */
  75                         (char *)&flag,          /* the cast is historical cruft */
  76                         sizeof(int));           /* length of option value */
  77
  78         LOG_INFO("accepting '%s' connection from %i", service->name, c->sin.sin_port);
  79         if ((retval = service->new_connection(c)) == ERROR_OK)
  80         {
  81         }
  82         else
  83         {
  84                 close_socket(c->fd);
  85                 LOG_ERROR("attempted '%s' connection rejected", service->name);
  86                 free(c);
  87                 return retval;
  88         }
  89
  90         /* add to the end of linked list */
  91         for (p = &service->connections; *p; p = &(*p)->next);
  92         *p = c;
  93
  94         service->max_connections--;
  95
  96         return ERROR_OK;
  97 }
  98
  99 int remove_connection(service_t *service, connection_t *connection)
 100 {
 101         connection_t **p = &service->connections;
 102         connection_t *c;
 103
 104         /* find connection */
 105         while((c = *p))
 106         {
 107                 if (c->fd == connection->fd)
 108                 {
 109                         service->connection_closed(c);
 110                         close_socket(c->fd);
 111                         command_done(c->cmd_ctx);
 112
 113                         /* delete connection */
 114                         *p = c->next;
 115                         free(c);
 116
 117                         service->max_connections++;
 118                         break;
 119                 }
 120
 121                 /* redirect p to next list pointer */
 122                 p = &(*p)->next;
 123         }
 124
 125         return ERROR_OK;
 126 }
 127
 128 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)
 129 {
 130         service_t *c, **p;
 131         int so_reuseaddr_option = 1;
 132
 133         c = malloc(sizeof(service_t));
 134
 135         c->name = strdup(name);
 136         c->type = type;
 137         c->port = port;
 138         c->max_connections = max_connections;
 139         c->fd = -1;
 140         c->connections = NULL;
 141         c->new_connection = new_connection_handler;
 142         c->input = input_handler;
 143         c->connection_closed = connection_closed_handler;
 144         c->priv = priv;
 145         c->next = NULL;
 146
 147         if ((c->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
 148         {
 149                 LOG_ERROR("error creating socket: %s", strerror(errno));
 150                 exit(-1);
 151         }
 152
 153         setsockopt(c->fd, SOL_SOCKET, SO_REUSEADDR, (void*)&so_reuseaddr_option, sizeof(int));
 154
 155         socket_nonblock(c->fd);
 156
 157         memset(&c->sin, 0, sizeof(c->sin));
 158         c->sin.sin_family = AF_INET;
 159         c->sin.sin_addr.s_addr = INADDR_ANY;
 160         c->sin.sin_port = htons(port);
 161
 162         if (bind(c->fd, (struct sockaddr *)&c->sin, sizeof(c->sin)) == -1)
 163         {
 164                 LOG_ERROR("couldn't bind to socket: %s", strerror(errno));
 165                 exit(-1);
 166         }
 167
 168 #ifndef _WIN32
 169         int segsize=65536;
 170         setsockopt(c->fd, IPPROTO_TCP, TCP_MAXSEG,  &segsize, sizeof(int));
 171 #endif
 172         int window_size = 128 * 1024;
 173
 174         /* These setsockopt()s must happen before the listen() */
 175
 176         setsockopt(c->fd, SOL_SOCKET, SO_SNDBUF,
 177                 (char *)&window_size, sizeof(window_size));
 178         setsockopt(c->fd, SOL_SOCKET, SO_RCVBUF,
 179                 (char *)&window_size, sizeof(window_size));
 180
 181         if (listen(c->fd, 1) == -1)
 182         {
 183                 LOG_ERROR("couldn't listen on socket: %s", strerror(errno));
 184                 exit(-1);
 185         }
 186
 187         /* add to the end of linked list */
 188         for (p = &services; *p; p = &(*p)->next);
 189         *p = c;
 190
 191         return ERROR_OK;
 192 }
 193
 194 int remove_service(unsigned short port)
 195 {
 196         service_t **p = &services;
 197         service_t *c;
 198
 199         /* find service */
 200         while((c = *p))
 201         {
 202                 if (c->port == port)
 203                 {
 204                         if (c->name)
 205                                 free(c->name);
 206
 207                         if (c->priv)
 208                                 free(c->priv);
 209
 210                         /* delete service */
 211                         *p = c->next;
 212                         free(c);
 213                 }
 214
 215                 /* redirect p to next list pointer */
 216                 p = &(*p)->next;
 217         }
 218
 219         return ERROR_OK;
 220 }
 221
 222 int remove_services()
 223 {
 224         service_t *c = services;
 225
 226         /* loop service */
 227         while(c)
 228         {
 229                 service_t *next = c->next;
 230
 231                 if (c->name)
 232                         free(c->name);
 233
 234                 if (c->priv)
 235                         free(c->priv);
 236
 237                 /* delete service */
 238                 free(c);
 239
 240                 /* remember the last service for unlinking */
 241                 c = next;
 242         }
 243
 244         services = NULL;
 245
 246         return ERROR_OK;
 247 }
 248
 249 extern void lockBigLock();
 250 extern void unlockBigLock();
 251
 252 int server_loop(command_context_t *command_context)
 253 {
 254         service_t *service;
 255
 256         /* used in select() */
 257         fd_set read_fds;
 258         struct timeval tv;
 259         int fd_max;
 260
 261         /* used in accept() */
 262         int retval;
 263
 264 #ifndef _WIN32
 265         if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
 266                 LOG_ERROR("couldn't set SIGPIPE to SIG_IGN");
 267 #endif
 268
 269         // This function is reentrant(workaround for configuration problems)
 270         static int lockCount=0;
 271         if (lockCount++==0)
 272         {
 273                 lockBigLock();
 274         }
 275
 276         /* do regular tasks after at most 10ms */
 277         tv.tv_sec = 0;
 278         tv.tv_usec = 10000;
 279
 280         while(!shutdown_openocd)
 281         {
 282                 /* monitor sockets for acitvity */
 283                 fd_max = 0;
 284                 FD_ZERO(&read_fds);
 285
 286                 /* add service and connection fds to read_fds */
 287                 for (service = services; service; service = service->next)
 288                 {
 289                         if (service->fd != -1)
 290                         {
 291                                 /* listen for new connections */
 292                                 FD_SET(service->fd, &read_fds);
 293
 294                                 if (service->fd > fd_max)
 295                                         fd_max = service->fd;
 296                         }
 297
 298                         if (service->connections)
 299                         {
 300                                 connection_t *c;
 301
 302                                 for (c = service->connections; c; c = c->next)
 303                                 {
 304                                         /* check for activity on the connection */
 305                                         FD_SET(c->fd, &read_fds);
 306                                         if (c->fd > fd_max)
 307                                                 fd_max = c->fd;
 308                                 }
 309                         }
 310                 }
 311
 312 #ifndef _WIN32
 313 #ifndef BUILD_ECOSBOARD
 314                 /* add STDIN to read_fds */
 315                 FD_SET(fileno(stdin), &read_fds);
 316 #endif
 317 #endif
 318
 319                 // Only while we're sleeping we'll let others run
 320                 unlockBigLock();
 321                 retval = select(fd_max + 1, &read_fds, NULL, NULL, &tv);
 322                 lockBigLock();
 323
 324                 if (retval == -1)
 325                 {
 326 #ifdef _WIN32
 327
 328                         errno = WSAGetLastError();
 329
 330                         if (errno == WSAEINTR)
 331                                 FD_ZERO(&read_fds);
 332                         else
 333                         {
 334                                 LOG_ERROR("error during select: %s", strerror(errno));
 335                                 exit(-1);
 336                         }
 337 #else
 338
 339                         if (errno == EINTR)
 340                         {
 341                                 FD_ZERO(&read_fds);
 342                         }
 343                         else
 344                         {
 345                                 LOG_ERROR("error during select: %s", strerror(errno));
 346                                 exit(-1);
 347                         }
 348 #endif
 349                 }
 350
 351                 target_call_timer_callbacks();
 352
 353                 if (retval == 0)
 354                 {
 355                         /* do regular tasks after at most 100ms */
 356                         tv.tv_sec = 0;
 357                         tv.tv_usec = 10000;
 358                         FD_ZERO(&read_fds); /* eCos leaves read_fds unchanged in this case!  */
 359                 }
 360
 361                 for (service = services; service; service = service->next)
 362                 {
 363                         /* handle new connections on listeners */
 364                         if ((service->fd != -1)
 365                                 && (FD_ISSET(service->fd, &read_fds)))
 366                         {
 367                                 if (service->max_connections > 0)
 368                                 {
 369                                         add_connection(service, command_context);
 370                                 }
 371                                 else
 372                                 {
 373                                         struct sockaddr_in sin;
 374                                         unsigned int address_size = sizeof(sin);
 375                                         int tmp_fd;
 376                                         tmp_fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
 377                                         close_socket(tmp_fd);
 378                                         LOG_INFO("rejected '%s' connection, no more connections allowed", service->name);
 379                                 }
 380                         }
 381
 382                         /* handle activity on connections */
 383                         if (service->connections)
 384                         {
 385                                 connection_t *c;
 386
 387                                 for (c = service->connections; c;)
 388                                 {
 389                                         if ((FD_ISSET(c->fd, &read_fds)) || c->input_pending)
 390                                         {
 391                                                 if (service->input(c) != ERROR_OK)
 392                                                 {
 393                                                         connection_t *next = c->next;
 394                                                         remove_connection(service, c);
 395                                                         LOG_INFO("dropped '%s' connection", service->name);
 396                                                         c = next;
 397                                                         continue;
 398                                                 }
 399                                         }
 400                                         c = c->next;
 401                                 }
 402                         }
 403                 }
 404
 405 #ifndef _WIN32
 406 #ifndef BUILD_ECOSBOARD
 407                 if (FD_ISSET(fileno(stdin), &read_fds))
 408                 {
 409                         if (getc(stdin) == 'x')
 410                         {
 411                                 shutdown_openocd = 1;
 412                         }
 413                 }
 414 #endif
 415 #else
 416                 MSG msg;
 417                 while (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
 418                 {
 419                         if (msg.message == WM_QUIT)
 420                                 shutdown_openocd = 1;
 421                 }
 422 #endif
 423         }
 424         if (--lockCount==0)
 425         {
 426                 unlockBigLock();
 427         }
 428
 429         return ERROR_OK;
 430 }
 431
 432 #ifdef _WIN32
 433 BOOL WINAPI ControlHandler(DWORD dwCtrlType)
 434 {
 435     shutdown_openocd = 1;
 436     return TRUE;
 437 }
 438
 439 void sig_handler(int sig) {
 440     shutdown_openocd = 1;
 441 }
 442 #endif
 443
 444 int server_init()
 445 {
 446 #ifdef _WIN32
 447         WORD wVersionRequested;
 448         WSADATA wsaData;
 449
 450         wVersionRequested = MAKEWORD( 2, 2 );
 451
 452         if (WSAStartup(wVersionRequested, &wsaData) != 0)
 453         {
 454                 LOG_ERROR("Failed to Open Winsock");
 455                 exit(-1);
 456         }
 457
 458         SetConsoleCtrlHandler( ControlHandler, TRUE );
 459
 460         signal(SIGINT, sig_handler);
 461         signal(SIGTERM, sig_handler);
 462         signal(SIGBREAK, sig_handler);
 463         signal(SIGABRT, sig_handler);
 464 #endif
 465
 466         return ERROR_OK;
 467 }
 468
 469 int server_quit()
 470 {
 471         remove_services();
 472
 473 #ifdef _WIN32
 474         WSACleanup();
 475         SetConsoleCtrlHandler( ControlHandler, FALSE );
 476 #endif
 477
 478         return ERROR_OK;
 479 }
 480
 481 int server_register_commands(command_context_t *context)
 482 {
 483         register_command(context, NULL, "shutdown", handle_shutdown_command,
 484                                          COMMAND_ANY, "shut the server down");
 485
 486         return ERROR_OK;
 487 }
 488
 489 /* tell the server we want to shut down */
 490 int handle_shutdown_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 491 {
 492         shutdown_openocd = 1;
 493
 494         return ERROR_COMMAND_CLOSE_CONNECTION;
 495 }