src/server/server.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include "server.h"
  31 #include <target/target.h>
  32 #include "openocd.h"
  33 #include "tcl_server.h"
  34 #include "telnet_server.h"
  35
  36 #include <signal.h>
  37
  38 #ifndef _WIN32
  39 #include <netinet/tcp.h>
  40 #endif
  41
  42
  43 static struct service *services = NULL;
  44
  45 /* shutdown_openocd == 1: exit the main event loop, and quit the debugger */
  46 static int shutdown_openocd = 0;
  47
  48 /* set when using pipes rather than tcp */
  49 int server_use_pipes = 0;
  50
  51 static int add_connection(struct service *service, struct command_context *cmd_ctx)
  52 {
  53         socklen_t address_size;
  54         struct connection *c, **p;
  55         int retval;
  56         int flag = 1;
  57
  58         c = malloc(sizeof(struct connection));
  59         c->fd = -1;
  60         memset(&c->sin, 0, sizeof(c->sin));
  61         c->cmd_ctx = copy_command_context(cmd_ctx);
  62         c->service = service;
  63         c->input_pending = 0;
  64         c->priv = NULL;
  65         c->next = NULL;
  66
  67         if (service->type == CONNECTION_TCP)
  68         {
  69                 address_size = sizeof(c->sin);
  70
  71                 c->fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
  72
  73                 /* This increases performance dramatically for e.g. GDB load which
  74                  * does not have a sliding window protocol. */
  75                 retval = setsockopt(c->fd,      /* socket affected */
  76                                 IPPROTO_TCP,            /* set option at TCP level */
  77                                 TCP_NODELAY,            /* name of option */
  78                                 (char *)&flag,          /* the cast is historical cruft */
  79                                 sizeof(int));           /* length of option value */
  80
  81                 LOG_INFO("accepting '%s' connection from %i", service->name, c->sin.sin_port);
  82                 if ((retval = service->new_connection(c)) != ERROR_OK)
  83                 {
  84                         close_socket(c->fd);
  85                         LOG_ERROR("attempted '%s' connection rejected", service->name);
  86                         free(c);
  87                         return retval;
  88                 }
  89         }
  90         else if (service->type == CONNECTION_PIPE)
  91         {
  92                 c->fd = service->fd;
  93
  94                 /* do not check for new connections again on stdin */
  95                 service->fd = -1;
  96
  97                 LOG_INFO("accepting '%s' connection from pipe", service->name);
  98                 if ((retval = service->new_connection(c)) != ERROR_OK)
  99                 {
 100                         LOG_ERROR("attempted '%s' connection rejected", service->name);
 101                         free(c);
 102                         return retval;
 103                 }
 104         }
 105
 106         /* add to the end of linked list */
 107         for (p = &service->connections; *p; p = &(*p)->next);
 108         *p = c;
 109
 110         service->max_connections--;
 111
 112         return ERROR_OK;
 113 }
 114
 115 static int remove_connection(struct service *service, struct connection *connection)
 116 {
 117         struct connection **p = &service->connections;
 118         struct connection *c;
 119
 120         /* find connection */
 121         while ((c = *p))
 122         {
 123                 if (c->fd == connection->fd)
 124                 {
 125                         service->connection_closed(c);
 126                         if (service->type == CONNECTION_TCP)
 127                                 close_socket(c->fd);
 128                         command_done(c->cmd_ctx);
 129
 130                         /* delete connection */
 131                         *p = c->next;
 132                         free(c);
 133
 134                         service->max_connections++;
 135                         break;
 136                 }
 137
 138                 /* redirect p to next list pointer */
 139                 p = &(*p)->next;
 140         }
 141
 142         return ERROR_OK;
 143 }
 144
 145 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)
 146 {
 147         struct service *c, **p;
 148         int so_reuseaddr_option = 1;
 149
 150         c = malloc(sizeof(struct service));
 151
 152         c->name = strdup(name);
 153         c->type = type;
 154         c->port = port;
 155         c->max_connections = max_connections;
 156         c->fd = -1;
 157         c->connections = NULL;
 158         c->new_connection = new_connection_handler;
 159         c->input = input_handler;
 160         c->connection_closed = connection_closed_handler;
 161         c->priv = priv;
 162         c->next = NULL;
 163
 164         if (type == CONNECTION_TCP)
 165         {
 166                 if ((c->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
 167                 {
 168                         LOG_ERROR("error creating socket: %s", strerror(errno));
 169                         exit(-1);
 170                 }
 171
 172                 setsockopt(c->fd, SOL_SOCKET, SO_REUSEADDR, (void*)&so_reuseaddr_option, sizeof(int));
 173
 174                 socket_nonblock(c->fd);
 175
 176                 memset(&c->sin, 0, sizeof(c->sin));
 177                 c->sin.sin_family = AF_INET;
 178                 c->sin.sin_addr.s_addr = INADDR_ANY;
 179                 c->sin.sin_port = htons(port);
 180
 181                 if (bind(c->fd, (struct sockaddr *)&c->sin, sizeof(c->sin)) == -1)
 182                 {
 183                         LOG_ERROR("couldn't bind to socket: %s", strerror(errno));
 184                         exit(-1);
 185                 }
 186
 187 #ifndef _WIN32
 188                 int segsize = 65536;
 189                 setsockopt(c->fd, IPPROTO_TCP, TCP_MAXSEG,  &segsize, sizeof(int));
 190 #endif
 191                 int window_size = 128 * 1024;
 192
 193                 /* These setsockopt()s must happen before the listen() */
 194
 195                 setsockopt(c->fd, SOL_SOCKET, SO_SNDBUF,
 196                         (char *)&window_size, sizeof(window_size));
 197                 setsockopt(c->fd, SOL_SOCKET, SO_RCVBUF,
 198                         (char *)&window_size, sizeof(window_size));
 199
 200                 if (listen(c->fd, 1) == -1)
 201                 {
 202                         LOG_ERROR("couldn't listen on socket: %s", strerror(errno));
 203                         exit(-1);
 204                 }
 205         }
 206         else if (type == CONNECTION_PIPE)
 207         {
 208                 /* use stdin */
 209                 c->fd = STDIN_FILENO;
 210
 211 #ifdef _WIN32
 212                 /* for win32 set stdin/stdout to binary mode */
 213                 if (_setmode(_fileno(stdout), _O_BINARY) < 0)
 214                         LOG_WARNING("cannot change stdout mode to binary");
 215                 if (_setmode(_fileno(stdin), _O_BINARY) < 0)
 216                         LOG_WARNING("cannot change stdin mode to binary");
 217                 if (_setmode(_fileno(stderr), _O_BINARY) < 0)
 218                         LOG_WARNING("cannot change stderr mode to binary");
 219 #else
 220                 socket_nonblock(c->fd);
 221 #endif
 222         }
 223         else
 224         {
 225                 LOG_ERROR("unknown connection type: %d", type);
 226                 exit(1);
 227         }
 228
 229         /* add to the end of linked list */
 230         for (p = &services; *p; p = &(*p)->next);
 231         *p = c;
 232
 233         return ERROR_OK;
 234 }
 235
 236 int remove_service(unsigned short port)
 237 {
 238         struct service **p = &services;
 239         struct service *c;
 240
 241         /* find service */
 242         while ((c = *p))
 243         {
 244                 if (c->port == port)
 245                 {
 246                         if (c->name)
 247                                 free(c->name);
 248
 249                         if (c->priv)
 250                                 free(c->priv);
 251
 252                         /* delete service */
 253                         *p = c->next;
 254                         free(c);
 255                 }
 256
 257                 /* redirect p to next list pointer */
 258                 p = &(*p)->next;
 259         }
 260
 261         return ERROR_OK;
 262 }
 263
 264 static int remove_services(void)
 265 {
 266         struct service *c = services;
 267
 268         /* loop service */
 269         while (c)
 270         {
 271                 struct service *next = c->next;
 272
 273                 if (c->name)
 274                         free(c->name);
 275
 276                 if (c->priv)
 277                         free(c->priv);
 278
 279                 /* delete service */
 280                 free(c);
 281
 282                 /* remember the last service for unlinking */
 283                 c = next;
 284         }
 285
 286         services = NULL;
 287
 288         return ERROR_OK;
 289 }
 290
 291 int server_loop(struct command_context *command_context)
 292 {
 293         struct service *service;
 294
 295         bool poll = true;
 296
 297         /* used in select() */
 298         fd_set read_fds;
 299         int fd_max;
 300
 301         /* used in accept() */
 302         int retval;
 303
 304 #ifndef _WIN32
 305         if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
 306                 LOG_ERROR("couldn't set SIGPIPE to SIG_IGN");
 307 #endif
 308
 309         while (!shutdown_openocd)
 310         {
 311                 /* monitor sockets for activity */
 312                 fd_max = 0;
 313                 FD_ZERO(&read_fds);
 314
 315                 /* add service and connection fds to read_fds */
 316                 for (service = services; service; service = service->next)
 317                 {
 318                         if (service->fd != -1)
 319                         {
 320                                 /* listen for new connections */
 321                                 FD_SET(service->fd, &read_fds);
 322
 323                                 if (service->fd > fd_max)
 324                                         fd_max = service->fd;
 325                         }
 326
 327                         if (service->connections)
 328                         {
 329                                 struct connection *c;
 330
 331                                 for (c = service->connections; c; c = c->next)
 332                                 {
 333                                         /* check for activity on the connection */
 334                                         FD_SET(c->fd, &read_fds);
 335                                         if (c->fd > fd_max)
 336                                                 fd_max = c->fd;
 337                                 }
 338                         }
 339                 }
 340
 341 #ifndef _WIN32
 342 #if BUILD_ECOSBOARD == 0
 343                 if (server_use_pipes == 0)
 344                 {
 345                         /* add STDIN to read_fds */
 346                         FD_SET(fileno(stdin), &read_fds);
 347                 }
 348 #endif
 349 #endif
 350
 351                 struct timeval tv;
 352                 tv.tv_sec = 0;
 353                 if (poll)
 354                 {
 355                         /* we're just polling this iteration, this is faster on embedded
 356                          * hosts */
 357                         tv.tv_usec = 0;
 358                         retval = socket_select(fd_max + 1, &read_fds, NULL, NULL, &tv);
 359                 } else
 360                 {
 361                         /* Every 100ms */
 362                         tv.tv_usec = 100000;
 363                         /* Only while we're sleeping we'll let others run */
 364                         openocd_sleep_prelude();
 365                         kept_alive();
 366                         retval = socket_select(fd_max + 1, &read_fds, NULL, NULL, &tv);
 367                         openocd_sleep_postlude();
 368                 }
 369
 370                 if (retval == -1)
 371                 {
 372 #ifdef _WIN32
 373
 374                         errno = WSAGetLastError();
 375
 376                         if (errno == WSAEINTR)
 377                                 FD_ZERO(&read_fds);
 378                         else
 379                         {
 380                                 LOG_ERROR("error during select: %s", strerror(errno));
 381                                 exit(-1);
 382                         }
 383 #else
 384
 385                         if (errno == EINTR)
 386                         {
 387                                 FD_ZERO(&read_fds);
 388                         }
 389                         else
 390                         {
 391                                 LOG_ERROR("error during select: %s", strerror(errno));
 392                                 exit(-1);
 393                         }
 394 #endif
 395                 }
 396
 397                 if (retval == 0)
 398                 {
 399                         /* We only execute these callbacks when there was nothing to do or we timed out */
 400                         target_call_timer_callbacks();
 401                         process_jim_events(command_context);
 402
 403                         FD_ZERO(&read_fds); /* eCos leaves read_fds unchanged in this case!  */
 404
 405                         /* We timed out/there was nothing to do, timeout rather than poll next time */
 406                         poll = false;
 407                 } else
 408                 {
 409                         /* There was something to do, next time we'll just poll */
 410                         poll = true;
 411                 }
 412
 413                 for (service = services; service; service = service->next)
 414                 {
 415                         /* handle new connections on listeners */
 416                         if ((service->fd != -1)
 417                                 && (FD_ISSET(service->fd, &read_fds)))
 418                         {
 419                                 if (service->max_connections > 0)
 420                                 {
 421                                         add_connection(service, command_context);
 422                                 }
 423                                 else
 424                                 {
 425                                         if (service->type != CONNECTION_PIPE)
 426                                         {
 427                                                 struct sockaddr_in sin;
 428                                                 socklen_t address_size = sizeof(sin);
 429                                                 int tmp_fd;
 430                                                 tmp_fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
 431                                                 close_socket(tmp_fd);
 432                                         }
 433                                         LOG_INFO("rejected '%s' connection, no more connections allowed", service->name);
 434                                 }
 435                         }
 436
 437                         /* handle activity on connections */
 438                         if (service->connections)
 439                         {
 440                                 struct connection *c;
 441
 442                                 for (c = service->connections; c;)
 443                                 {
 444                                         if ((FD_ISSET(c->fd, &read_fds)) || c->input_pending)
 445                                         {
 446                                                 if ((retval = service->input(c)) != ERROR_OK)
 447                                                 {
 448                                                         struct connection *next = c->next;
 449                                                         if (service->type == CONNECTION_PIPE)
 450                                                         {
 451                                                                 /* if connection uses a pipe then shutdown openocd on error */
 452                                                                 shutdown_openocd = 1;
 453                                                         }
 454                                                         remove_connection(service, c);
 455                                                         LOG_INFO("dropped '%s' connection - error %d", service->name, retval);
 456                                                         c = next;
 457                                                         continue;
 458                                                 }
 459                                         }
 460                                         c = c->next;
 461                                 }
 462                         }
 463                 }
 464
 465 #ifndef _WIN32
 466 #if BUILD_ECOSBOARD == 0
 467                 /* check for data on stdin if not using pipes */
 468                 if (server_use_pipes == 0)
 469                 {
 470                         if (FD_ISSET(fileno(stdin), &read_fds))
 471                         {
 472                                 if (getc(stdin) == 'x')
 473                                 {
 474                                         shutdown_openocd = 1;
 475                                 }
 476                         }
 477                 }
 478 #endif
 479 #else
 480                 MSG msg;
 481                 while (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
 482                 {
 483                         if (msg.message == WM_QUIT)
 484                                 shutdown_openocd = 1;
 485                 }
 486 #endif
 487         }
 488
 489         return ERROR_OK;
 490 }
 491
 492 #ifdef _WIN32
 493 BOOL WINAPI ControlHandler(DWORD dwCtrlType)
 494 {
 495         shutdown_openocd = 1;
 496         return TRUE;
 497 }
 498
 499 void sig_handler(int sig) {
 500         shutdown_openocd = 1;
 501 }
 502 #endif
 503
 504 int server_preinit(void)
 505 {
 506         /* this currently only calls WSAStartup on native win32 systems
 507          * before any socket operations are performed.
 508          * This is an issue if you call init in your config script */
 509
 510 #ifdef _WIN32
 511         WORD wVersionRequested;
 512         WSADATA wsaData;
 513
 514         wVersionRequested = MAKEWORD(2, 2);
 515
 516         if (WSAStartup(wVersionRequested, &wsaData) != 0)
 517         {
 518                 LOG_ERROR("Failed to Open Winsock");
 519                 exit(-1);
 520         }
 521
 522         if (server_use_pipes == 0)
 523         {
 524                 /* register ctrl-c handler */
 525                 SetConsoleCtrlHandler(ControlHandler, TRUE);
 526         }
 527         else
 528         {
 529                 /* we are using pipes so ignore ctrl-c */
 530                 SetConsoleCtrlHandler(NULL, TRUE);
 531         }
 532
 533         signal(SIGINT, sig_handler);
 534         signal(SIGTERM, sig_handler);
 535         signal(SIGBREAK, sig_handler);
 536         signal(SIGABRT, sig_handler);
 537 #endif
 538
 539         return ERROR_OK;
 540 }
 541
 542 int server_init(struct command_context *cmd_ctx)
 543 {
 544         int ret = tcl_init(cmd_ctx);
 545         if (ERROR_OK != ret)
 546                 return ret;
 547
 548         return telnet_init("Open On-Chip Debugger");
 549 }
 550
 551 int server_quit(void)
 552 {
 553         remove_services();
 554
 555 #ifdef _WIN32
 556         WSACleanup();
 557         SetConsoleCtrlHandler(ControlHandler, FALSE);
 558 #endif
 559
 560         return ERROR_OK;
 561 }
 562
 563 /* tell the server we want to shut down */
 564 COMMAND_HANDLER(handle_shutdown_command)
 565 {
 566         LOG_USER("shutdown command invoked");
 567
 568         shutdown_openocd = 1;
 569
 570         return ERROR_OK;
 571 }
 572
 573 static const struct command_registration server_command_handlers[] = {
 574         {
 575                 .name = "shutdown",
 576                 .handler = &handle_shutdown_command,
 577                 .mode = COMMAND_ANY,
 578                 .help = "shut the server down",
 579         },
 580         COMMAND_REGISTRATION_DONE
 581 };
 582
 583 int server_register_commands(struct command_context *cmd_ctx)
 584 {
 585         int retval = telnet_register_commands(cmd_ctx);
 586         if (ERROR_OK != retval)
 587                 return retval;
 588
 589         retval = tcl_register_commands(cmd_ctx);
 590         if (ERROR_OK != retval)
 591                 return retval;
 592
 593         return register_commands(cmd_ctx, NULL, server_command_handlers);
 594 }
 595
 596 SERVER_PORT_COMMAND()
 597 {
 598         switch (CMD_ARGC) {
 599         case 0:
 600                 command_print(CMD_CTX, "%d", *out);
 601                 break;
 602         case 1:
 603         {
 604                 uint16_t port;
 605                 COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0], port);
 606                 *out = port;
 607                 break;
 608         }
 609         default:
 610                 return ERROR_INVALID_ARGUMENTS;
 611         }
 612         return ERROR_OK;
 613 }