src/server/server.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007-2010 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 static int add_connection(struct service *service, struct command_context *cmd_ctx)
  49 {
  50         socklen_t address_size;
  51         struct connection *c, **p;
  52         int retval;
  53         int flag = 1;
  54
  55         c = malloc(sizeof(struct connection));
  56         c->fd = -1;
  57         c->fd_out = -1;
  58         memset(&c->sin, 0, sizeof(c->sin));
  59         c->cmd_ctx = copy_command_context(cmd_ctx);
  60         c->service = service;
  61         c->input_pending = 0;
  62         c->priv = NULL;
  63         c->next = NULL;
  64
  65         if (service->type == CONNECTION_TCP)
  66         {
  67                 address_size = sizeof(c->sin);
  68
  69                 c->fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
  70                 c->fd_out = c->fd;
  71
  72                 /* This increases performance dramatically for e.g. GDB load which
  73                  * does not have a sliding window protocol. */
  74                 retval = setsockopt(c->fd,      /* socket affected */
  75                                 IPPROTO_TCP,            /* set option at TCP level */
  76                                 TCP_NODELAY,            /* name of option */
  77                                 (char *)&flag,          /* the cast is historical cruft */
  78                                 sizeof(int));           /* length of option value */
  79
  80                 LOG_INFO("accepting '%s' connection from %s", service->name, service->port);
  81                 if ((retval = service->new_connection(c)) != ERROR_OK)
  82                 {
  83                         close_socket(c->fd);
  84                         LOG_ERROR("attempted '%s' connection rejected", service->name);
  85                         free(c);
  86                         return retval;
  87                 }
  88         } else if (service->type == CONNECTION_STDINOUT)
  89         {
  90                 c->fd = service->fd;
  91                 c->fd_out = fileno(stdout);
  92
  93 #ifdef _WIN32
  94                 /* we are using stdin/out so ignore ctrl-c under windoze */
  95                 SetConsoleCtrlHandler(NULL, TRUE);
  96 #endif
  97
  98                 /* do not check for new connections again on stdin */
  99                 service->fd = -1;
 100
 101                 LOG_INFO("accepting '%s' connection from pipe", service->name);
 102                 if ((retval = service->new_connection(c)) != ERROR_OK)
 103                 {
 104                         LOG_ERROR("attempted '%s' connection rejected", service->name);
 105                         free(c);
 106                         return retval;
 107                 }
 108         } else if (service->type == CONNECTION_PIPE)
 109         {
 110                 c->fd = service->fd;
 111                 /* do not check for new connections again on stdin */
 112                 service->fd = -1;
 113
 114                 char * out_file = alloc_printf("%so", service->port);
 115                 c->fd_out = open(out_file, O_WRONLY);
 116                 free(out_file);
 117                 if (c->fd_out == -1)
 118                 {
 119                         LOG_ERROR("could not open %s", service->port);
 120                         exit(1);
 121                 }
 122
 123                 LOG_INFO("accepting '%s' connection from pipe %s", service->name, service->port);
 124                 if ((retval = service->new_connection(c)) != ERROR_OK)
 125                 {
 126                         LOG_ERROR("attempted '%s' connection rejected", service->name);
 127                         free(c);
 128                         return retval;
 129                 }
 130         }
 131
 132         /* add to the end of linked list */
 133         for (p = &service->connections; *p; p = &(*p)->next);
 134         *p = c;
 135
 136         service->max_connections--;
 137
 138         return ERROR_OK;
 139 }
 140
 141 static int remove_connection(struct service *service, struct connection *connection)
 142 {
 143         struct connection **p = &service->connections;
 144         struct connection *c;
 145
 146         /* find connection */
 147         while ((c = *p))
 148         {
 149                 if (c->fd == connection->fd)
 150                 {
 151                         service->connection_closed(c);
 152                         if (service->type == CONNECTION_TCP)
 153                         {
 154                                 close_socket(c->fd);
 155                         } else if (service->type == CONNECTION_PIPE)
 156                         {
 157                                 /* The service will listen to the pipe again */
 158                                 c->service->fd = c->fd;
 159                         }
 160
 161                         command_done(c->cmd_ctx);
 162
 163                         /* delete connection */
 164                         *p = c->next;
 165                         free(c);
 166
 167                         service->max_connections++;
 168                         break;
 169                 }
 170
 171                 /* redirect p to next list pointer */
 172                 p = &(*p)->next;
 173         }
 174
 175         return ERROR_OK;
 176 }
 177
 178 /* FIX! make service return error instead of invoking exit() */
 179 int add_service(char *name, const char *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)
 180 {
 181         struct service *c, **p;
 182         int so_reuseaddr_option = 1;
 183
 184         c = malloc(sizeof(struct service));
 185
 186         c->name = strdup(name);
 187         c->port = strdup(port);
 188         c->max_connections = 1; /* Only TCP/IP ports can support more than one connection */
 189         c->fd = -1;
 190         c->connections = NULL;
 191         c->new_connection = new_connection_handler;
 192         c->input = input_handler;
 193         c->connection_closed = connection_closed_handler;
 194         c->priv = priv;
 195         c->next = NULL;
 196         long portnumber;
 197         if (strcmp(c->port, "pipe") == 0)
 198         {
 199                 c->type = CONNECTION_STDINOUT;
 200         } else
 201         {
 202                 char *end;
 203                 strtol(c->port, &end, 0);
 204                 if (!*end && (parse_long(c->port, &portnumber) == ERROR_OK))
 205                 {
 206                         c->portnumber = portnumber;
 207                         c->type = CONNECTION_TCP;
 208                 } else
 209                 {
 210                         c->type = CONNECTION_PIPE;
 211                 }
 212         }
 213
 214         if (c->type == CONNECTION_TCP)
 215         {
 216                 c->max_connections = max_connections;
 217
 218                 if ((c->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
 219                 {
 220                         LOG_ERROR("error creating socket: %s", strerror(errno));
 221                         exit(-1);
 222                 }
 223
 224                 setsockopt(c->fd, SOL_SOCKET, SO_REUSEADDR, (void*)&so_reuseaddr_option, sizeof(int));
 225
 226                 socket_nonblock(c->fd);
 227
 228                 memset(&c->sin, 0, sizeof(c->sin));
 229                 c->sin.sin_family = AF_INET;
 230                 c->sin.sin_addr.s_addr = INADDR_ANY;
 231                 c->sin.sin_port = htons(c->portnumber);
 232
 233                 if (bind(c->fd, (struct sockaddr *)&c->sin, sizeof(c->sin)) == -1)
 234                 {
 235                         LOG_ERROR("couldn't bind to socket: %s", strerror(errno));
 236                         exit(-1);
 237                 }
 238
 239 #ifndef _WIN32
 240                 int segsize = 65536;
 241                 setsockopt(c->fd, IPPROTO_TCP, TCP_MAXSEG,  &segsize, sizeof(int));
 242 #endif
 243                 int window_size = 128 * 1024;
 244
 245                 /* These setsockopt()s must happen before the listen() */
 246
 247                 setsockopt(c->fd, SOL_SOCKET, SO_SNDBUF,
 248                         (char *)&window_size, sizeof(window_size));
 249                 setsockopt(c->fd, SOL_SOCKET, SO_RCVBUF,
 250                         (char *)&window_size, sizeof(window_size));
 251
 252                 if (listen(c->fd, 1) == -1)
 253                 {
 254                         LOG_ERROR("couldn't listen on socket: %s", strerror(errno));
 255                         exit(-1);
 256                 }
 257         }
 258         else if (c->type == CONNECTION_STDINOUT)
 259         {
 260                 c->fd = fileno(stdin);
 261
 262 #ifdef _WIN32
 263                 /* for win32 set stdin/stdout to binary mode */
 264                 if (_setmode(_fileno(stdout), _O_BINARY) < 0)
 265                         LOG_WARNING("cannot change stdout mode to binary");
 266                 if (_setmode(_fileno(stdin), _O_BINARY) < 0)
 267                         LOG_WARNING("cannot change stdin mode to binary");
 268                 if (_setmode(_fileno(stderr), _O_BINARY) < 0)
 269                         LOG_WARNING("cannot change stderr mode to binary");
 270 #else
 271                 socket_nonblock(c->fd);
 272 #endif
 273         }
 274         else if (c->type == CONNECTION_PIPE)
 275         {
 276 #ifdef _WIN32
 277                 /* we currenty do not support named pipes under win32
 278                  * so exit openocd for now */
 279                 LOG_ERROR("Named pipes currently not supported under this os");
 280                 exit(1);
 281 #else
 282                 /* Pipe we're reading from */
 283                 c->fd = open(c->port, O_RDONLY | O_NONBLOCK);
 284                 if (c->fd == -1)
 285                 {
 286                         LOG_ERROR("could not open %s", c->port);
 287                         exit(1);
 288                 }
 289 #endif
 290         }
 291
 292         /* add to the end of linked list */
 293         for (p = &services; *p; p = &(*p)->next);
 294         *p = c;
 295
 296         return ERROR_OK;
 297 }
 298
 299 static int remove_services(void)
 300 {
 301         struct service *c = services;
 302
 303         /* loop service */
 304         while (c)
 305         {
 306                 struct service *next = c->next;
 307
 308                 if (c->name)
 309                         free(c->name);
 310
 311                 if (c->type == CONNECTION_PIPE)
 312                 {
 313                         if (c->fd != -1)
 314                                 close(c->fd);
 315                 }
 316                 if (c->port)
 317                         free((void *)c->port);
 318
 319                 if (c->priv)
 320                         free(c->priv);
 321
 322                 /* delete service */
 323                 free(c);
 324
 325                 /* remember the last service for unlinking */
 326                 c = next;
 327         }
 328
 329         services = NULL;
 330
 331         return ERROR_OK;
 332 }
 333
 334 int server_loop(struct command_context *command_context)
 335 {
 336         struct service *service;
 337
 338         bool poll_ok = true;
 339
 340         /* used in select() */
 341         fd_set read_fds;
 342         int fd_max;
 343
 344         /* used in accept() */
 345         int retval;
 346
 347 #ifndef _WIN32
 348         if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
 349                 LOG_ERROR("couldn't set SIGPIPE to SIG_IGN");
 350 #endif
 351
 352         while (!shutdown_openocd)
 353         {
 354                 /* monitor sockets for activity */
 355                 fd_max = 0;
 356                 FD_ZERO(&read_fds);
 357
 358                 /* add service and connection fds to read_fds */
 359                 for (service = services; service; service = service->next)
 360                 {
 361                         if (service->fd != -1)
 362                         {
 363                                 /* listen for new connections */
 364                                 FD_SET(service->fd, &read_fds);
 365
 366                                 if (service->fd > fd_max)
 367                                         fd_max = service->fd;
 368                         }
 369
 370                         if (service->connections)
 371                         {
 372                                 struct connection *c;
 373
 374                                 for (c = service->connections; c; c = c->next)
 375                                 {
 376                                         /* check for activity on the connection */
 377                                         FD_SET(c->fd, &read_fds);
 378                                         if (c->fd > fd_max)
 379                                                 fd_max = c->fd;
 380                                 }
 381                         }
 382                 }
 383
 384                 struct timeval tv;
 385                 tv.tv_sec = 0;
 386                 if (poll_ok)
 387                 {
 388                         /* we're just polling this iteration, this is faster on embedded
 389                          * hosts */
 390                         tv.tv_usec = 0;
 391                         retval = socket_select(fd_max + 1, &read_fds, NULL, NULL, &tv);
 392                 } else
 393                 {
 394                         /* Every 100ms */
 395                         tv.tv_usec = 100000;
 396                         /* Only while we're sleeping we'll let others run */
 397                         openocd_sleep_prelude();
 398                         kept_alive();
 399                         retval = socket_select(fd_max + 1, &read_fds, NULL, NULL, &tv);
 400                         openocd_sleep_postlude();
 401                 }
 402
 403                 if (retval == -1)
 404                 {
 405 #ifdef _WIN32
 406
 407                         errno = WSAGetLastError();
 408
 409                         if (errno == WSAEINTR)
 410                                 FD_ZERO(&read_fds);
 411                         else
 412                         {
 413                                 LOG_ERROR("error during select: %s", strerror(errno));
 414                                 exit(-1);
 415                         }
 416 #else
 417
 418                         if (errno == EINTR)
 419                         {
 420                                 FD_ZERO(&read_fds);
 421                         }
 422                         else
 423                         {
 424                                 LOG_ERROR("error during select: %s", strerror(errno));
 425                                 exit(-1);
 426                         }
 427 #endif
 428                 }
 429
 430                 if (retval == 0)
 431                 {
 432                         /* We only execute these callbacks when there was nothing to do or we timed out */
 433                         target_call_timer_callbacks();
 434                         process_jim_events(command_context);
 435
 436                         FD_ZERO(&read_fds); /* eCos leaves read_fds unchanged in this case!  */
 437
 438                         /* We timed out/there was nothing to do, timeout rather than poll next time */
 439                         poll_ok = false;
 440                 } else
 441                 {
 442                         /* There was something to do, next time we'll just poll */
 443                         poll_ok = true;
 444                 }
 445
 446                 for (service = services; service; service = service->next)
 447                 {
 448                         /* handle new connections on listeners */
 449                         if ((service->fd != -1)
 450                                 && (FD_ISSET(service->fd, &read_fds)))
 451                         {
 452                                 if (service->max_connections > 0)
 453                                 {
 454                                         add_connection(service, command_context);
 455                                 }
 456                                 else
 457                                 {
 458                                         if (service->type == CONNECTION_TCP)
 459                                         {
 460                                                 struct sockaddr_in sin;
 461                                                 socklen_t address_size = sizeof(sin);
 462                                                 int tmp_fd;
 463                                                 tmp_fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
 464                                                 close_socket(tmp_fd);
 465                                         }
 466                                         LOG_INFO("rejected '%s' connection, no more connections allowed", service->name);
 467                                 }
 468                         }
 469
 470                         /* handle activity on connections */
 471                         if (service->connections)
 472                         {
 473                                 struct connection *c;
 474
 475                                 for (c = service->connections; c;)
 476                                 {
 477                                         if ((FD_ISSET(c->fd, &read_fds)) || c->input_pending)
 478                                         {
 479                                                 if ((retval = service->input(c)) != ERROR_OK)
 480                                                 {
 481                                                         struct connection *next = c->next;
 482                                                         if (service->type == CONNECTION_PIPE)
 483                                                         {
 484                                                                 /* if connection uses a pipe then shutdown openocd on error */
 485                                                                 shutdown_openocd = 1;
 486                                                         }
 487                                                         remove_connection(service, c);
 488                                                         LOG_INFO("dropped '%s' connection - error %d", service->name, retval);
 489                                                         c = next;
 490                                                         continue;
 491                                                 }
 492                                         }
 493                                         c = c->next;
 494                                 }
 495                         }
 496                 }
 497
 498 #ifdef _WIN32
 499                 MSG msg;
 500                 while (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
 501                 {
 502                         if (msg.message == WM_QUIT)
 503                                 shutdown_openocd = 1;
 504                 }
 505 #endif
 506         }
 507
 508         return ERROR_OK;
 509 }
 510
 511 #ifdef _WIN32
 512 BOOL WINAPI ControlHandler(DWORD dwCtrlType)
 513 {
 514         shutdown_openocd = 1;
 515         return TRUE;
 516 }
 517
 518 void sig_handler(int sig) {
 519         shutdown_openocd = 1;
 520 }
 521 #endif
 522
 523 int server_preinit(void)
 524 {
 525         /* this currently only calls WSAStartup on native win32 systems
 526          * before any socket operations are performed.
 527          * This is an issue if you call init in your config script */
 528
 529 #ifdef _WIN32
 530         WORD wVersionRequested;
 531         WSADATA wsaData;
 532
 533         wVersionRequested = MAKEWORD(2, 2);
 534
 535         if (WSAStartup(wVersionRequested, &wsaData) != 0)
 536         {
 537                 LOG_ERROR("Failed to Open Winsock");
 538                 exit(-1);
 539         }
 540
 541         /* register ctrl-c handler */
 542         SetConsoleCtrlHandler(ControlHandler, TRUE);
 543
 544         signal(SIGINT, sig_handler);
 545         signal(SIGTERM, sig_handler);
 546         signal(SIGBREAK, sig_handler);
 547         signal(SIGABRT, sig_handler);
 548 #endif
 549
 550         return ERROR_OK;
 551 }
 552
 553 int server_init(struct command_context *cmd_ctx)
 554 {
 555         int ret = tcl_init();
 556         if (ERROR_OK != ret)
 557                 return ret;
 558
 559         return telnet_init("Open On-Chip Debugger");
 560 }
 561
 562 int server_quit(void)
 563 {
 564         remove_services();
 565
 566 #ifdef _WIN32
 567         WSACleanup();
 568         SetConsoleCtrlHandler(ControlHandler, FALSE);
 569 #endif
 570
 571         return ERROR_OK;
 572 }
 573
 574 int connection_write(struct connection *connection, const void *data, int len)
 575 {
 576         if (len == 0)
 577         {
 578                 /* successful no-op. Sockets and pipes behave differently here... */
 579                 return 0;
 580         }
 581         if (connection->service->type == CONNECTION_TCP)
 582         {
 583                 return write_socket(connection->fd_out, data, len);
 584         } else
 585         {
 586                 return write(connection->fd_out, data, len);
 587         }
 588 }
 589
 590 int connection_read(struct connection *connection, void *data, int len)
 591 {
 592         if (connection->service->type == CONNECTION_TCP)
 593         {
 594                 return read_socket(connection->fd, data, len);
 595         } else
 596         {
 597                 return read(connection->fd, data, len);
 598         }
 599 }
 600
 601 /* tell the server we want to shut down */
 602 COMMAND_HANDLER(handle_shutdown_command)
 603 {
 604         LOG_USER("shutdown command invoked");
 605
 606         shutdown_openocd = 1;
 607
 608         return ERROR_OK;
 609 }
 610
 611 static const struct command_registration server_command_handlers[] = {
 612         {
 613                 .name = "shutdown",
 614                 .handler = &handle_shutdown_command,
 615                 .mode = COMMAND_ANY,
 616                 .help = "shut the server down",
 617         },
 618         COMMAND_REGISTRATION_DONE
 619 };
 620
 621 int server_register_commands(struct command_context *cmd_ctx)
 622 {
 623         int retval = telnet_register_commands(cmd_ctx);
 624         if (ERROR_OK != retval)
 625                 return retval;
 626
 627         retval = tcl_register_commands(cmd_ctx);
 628         if (ERROR_OK != retval)
 629                 return retval;
 630
 631         return register_commands(cmd_ctx, NULL, server_command_handlers);
 632 }
 633
 634 SERVER_PORT_COMMAND()
 635 {
 636         switch (CMD_ARGC) {
 637         case 0:
 638                 command_print(CMD_CTX, "%d", *out);
 639                 break;
 640         case 1:
 641         {
 642                 uint16_t port;
 643                 COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0], port);
 644                 *out = port;
 645                 break;
 646         }
 647         default:
 648                 return ERROR_INVALID_ARGUMENTS;
 649         }
 650         return ERROR_OK;
 651 }
 652
 653 SERVER_PIPE_COMMAND()
 654 {
 655         switch (CMD_ARGC) {
 656         case 0:
 657                 command_print(CMD_CTX, "%s", *out);
 658                 break;
 659         case 1:
 660         {
 661                 const char * t = strdup(CMD_ARGV[0]);
 662                 free((void *)*out);
 663                 *out = t;
 664                 break;
 665         }
 666         default:
 667                 return ERROR_INVALID_ARGUMENTS;
 668         }
 669         return ERROR_OK;
 670 }
 671