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.h"
  32
  33 #include <signal.h>
  34
  35 #ifndef _WIN32
  36 #include <netinet/tcp.h>
  37 #endif
  38
  39
  40 struct service *services = NULL;
  41
  42 /* shutdown_openocd == 1: exit the main event loop, and quit the debugger */
  43 static int shutdown_openocd = 0;
  44
  45 /* set when using pipes rather than tcp */
  46 int server_use_pipes = 0;
  47
  48 int add_connection(struct service *service, command_context_t *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         memset(&c->sin, 0, sizeof(c->sin));
  58         c->cmd_ctx = copy_command_context(cmd_ctx);
  59         c->service = service;
  60         c->input_pending = 0;
  61         c->priv = NULL;
  62         c->next = NULL;
  63
  64         if (service->type == CONNECTION_TCP)
  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                         close_socket(c->fd);
  82                         LOG_ERROR("attempted '%s' connection rejected", service->name);
  83                         free(c);
  84                         return retval;
  85                 }
  86         }
  87         else if (service->type == CONNECTION_PIPE)
  88         {
  89                 c->fd = service->fd;
  90
  91                 /* do not check for new connections again on stdin */
  92                 service->fd = -1;
  93
  94                 LOG_INFO("accepting '%s' connection from pipe", service->name);
  95                 if ((retval = service->new_connection(c)) != ERROR_OK)
  96                 {
  97                         LOG_ERROR("attempted '%s' connection rejected", service->name);
  98                         free(c);
  99                         return retval;
 100                 }
 101         }
 102
 103         /* add to the end of linked list */
 104         for (p = &service->connections; *p; p = &(*p)->next);
 105         *p = c;
 106
 107         service->max_connections--;
 108
 109         return ERROR_OK;
 110 }
 111
 112 int remove_connection(struct service *service, struct connection *connection)
 113 {
 114         struct connection **p = &service->connections;
 115         struct connection *c;
 116
 117         /* find connection */
 118         while ((c = *p))
 119         {
 120                 if (c->fd == connection->fd)
 121                 {
 122                         service->connection_closed(c);
 123                         if (service->type == CONNECTION_TCP)
 124                                 close_socket(c->fd);
 125                         command_done(c->cmd_ctx);
 126
 127                         /* delete connection */
 128                         *p = c->next;
 129                         free(c);
 130
 131                         service->max_connections++;
 132                         break;
 133                 }
 134
 135                 /* redirect p to next list pointer */
 136                 p = &(*p)->next;
 137         }
 138
 139         return ERROR_OK;
 140 }
 141
 142 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)
 143 {
 144         struct service *c, **p;
 145         int so_reuseaddr_option = 1;
 146
 147         c = malloc(sizeof(struct service));
 148
 149         c->name = strdup(name);
 150         c->type = type;
 151         c->port = port;
 152         c->max_connections = max_connections;
 153         c->fd = -1;
 154         c->connections = NULL;
 155         c->new_connection = new_connection_handler;
 156         c->input = input_handler;
 157         c->connection_closed = connection_closed_handler;
 158         c->priv = priv;
 159         c->next = NULL;
 160
 161         if (type == CONNECTION_TCP)
 162         {
 163                 if ((c->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
 164                 {
 165                         LOG_ERROR("error creating socket: %s", strerror(errno));
 166                         exit(-1);
 167                 }
 168
 169                 setsockopt(c->fd, SOL_SOCKET, SO_REUSEADDR, (void*)&so_reuseaddr_option, sizeof(int));
 170
 171                 socket_nonblock(c->fd);
 172
 173                 memset(&c->sin, 0, sizeof(c->sin));
 174                 c->sin.sin_family = AF_INET;
 175                 c->sin.sin_addr.s_addr = INADDR_ANY;
 176                 c->sin.sin_port = htons(port);
 177
 178                 if (bind(c->fd, (struct sockaddr *)&c->sin, sizeof(c->sin)) == -1)
 179                 {
 180                         LOG_ERROR("couldn't bind to socket: %s", strerror(errno));
 181                         exit(-1);
 182                 }
 183
 184 #ifndef _WIN32
 185                 int segsize = 65536;
 186                 setsockopt(c->fd, IPPROTO_TCP, TCP_MAXSEG,  &segsize, sizeof(int));
 187 #endif
 188                 int window_size = 128 * 1024;
 189
 190                 /* These setsockopt()s must happen before the listen() */
 191
 192                 setsockopt(c->fd, SOL_SOCKET, SO_SNDBUF,
 193                         (char *)&window_size, sizeof(window_size));
 194                 setsockopt(c->fd, SOL_SOCKET, SO_RCVBUF,
 195                         (char *)&window_size, sizeof(window_size));
 196
 197                 if (listen(c->fd, 1) == -1)
 198                 {
 199                         LOG_ERROR("couldn't listen on socket: %s", strerror(errno));
 200                         exit(-1);
 201                 }
 202         }
 203         else if (type == CONNECTION_PIPE)
 204         {
 205                 /* use stdin */
 206                 c->fd = STDIN_FILENO;
 207
 208 #ifdef _WIN32
 209                 /* for win32 set stdin/stdout to binary mode */
 210                 if (_setmode(_fileno(stdout), _O_BINARY) < 0)
 211                         LOG_WARNING("cannot change stdout mode to binary");
 212                 if (_setmode(_fileno(stdin), _O_BINARY) < 0)
 213                         LOG_WARNING("cannot change stdin mode to binary");
 214                 if (_setmode(_fileno(stderr), _O_BINARY) < 0)
 215                         LOG_WARNING("cannot change stderr mode to binary");
 216 #else
 217                 socket_nonblock(c->fd);
 218 #endif
 219         }
 220         else
 221         {
 222                 LOG_ERROR("unknown connection type: %d", type);
 223                 exit(1);
 224         }
 225
 226         /* add to the end of linked list */
 227         for (p = &services; *p; p = &(*p)->next);
 228         *p = c;
 229
 230         return ERROR_OK;
 231 }
 232
 233 int remove_service(unsigned short port)
 234 {
 235         struct service **p = &services;
 236         struct service *c;
 237
 238         /* find service */
 239         while ((c = *p))
 240         {
 241                 if (c->port == port)
 242                 {
 243                         if (c->name)
 244                                 free(c->name);
 245
 246                         if (c->priv)
 247                                 free(c->priv);
 248
 249                         /* delete service */
 250                         *p = c->next;
 251                         free(c);
 252                 }
 253
 254                 /* redirect p to next list pointer */
 255                 p = &(*p)->next;
 256         }
 257
 258         return ERROR_OK;
 259 }
 260
 261 int remove_services(void)
 262 {
 263         struct service *c = services;
 264
 265         /* loop service */
 266         while (c)
 267         {
 268                 struct service *next = c->next;
 269
 270                 if (c->name)
 271                         free(c->name);
 272
 273                 if (c->priv)
 274                         free(c->priv);
 275
 276                 /* delete service */
 277                 free(c);
 278
 279                 /* remember the last service for unlinking */
 280                 c = next;
 281         }
 282
 283         services = NULL;
 284
 285         return ERROR_OK;
 286 }
 287
 288 extern void openocd_sleep_prelude(void);
 289 extern void openocd_sleep_postlude(void);
 290
 291 int server_loop(command_context_t *command_context)
 292 {
 293         struct service *service;
 294
 295         /* used in select() */
 296         fd_set read_fds;
 297         struct timeval tv;
 298         int fd_max;
 299
 300         /* used in accept() */
 301         int retval;
 302
 303 #ifndef _WIN32
 304         if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
 305                 LOG_ERROR("couldn't set SIGPIPE to SIG_IGN");
 306 #endif
 307
 308         /* do regular tasks after at most 10ms */
 309         tv.tv_sec = 0;
 310         tv.tv_usec = 10000;
 311
 312         while (!shutdown_openocd)
 313         {
 314                 /* monitor sockets for acitvity */
 315                 fd_max = 0;
 316                 FD_ZERO(&read_fds);
 317
 318                 /* add service and connection fds to read_fds */
 319                 for (service = services; service; service = service->next)
 320                 {
 321                         if (service->fd != -1)
 322                         {
 323                                 /* listen for new connections */
 324                                 FD_SET(service->fd, &read_fds);
 325
 326                                 if (service->fd > fd_max)
 327                                         fd_max = service->fd;
 328                         }
 329
 330                         if (service->connections)
 331                         {
 332                                 struct connection *c;
 333
 334                                 for (c = service->connections; c; c = c->next)
 335                                 {
 336                                         /* check for activity on the connection */
 337                                         FD_SET(c->fd, &read_fds);
 338                                         if (c->fd > fd_max)
 339                                                 fd_max = c->fd;
 340                                 }
 341                         }
 342                 }
 343
 344 #ifndef _WIN32
 345 #if BUILD_ECOSBOARD == 0
 346                 if (server_use_pipes == 0)
 347                 {
 348                         /* add STDIN to read_fds */
 349                         FD_SET(fileno(stdin), &read_fds);
 350                 }
 351 #endif
 352 #endif
 353
 354                 openocd_sleep_prelude();
 355                 kept_alive();
 356
 357                 /* Only while we're sleeping we'll let others run */
 358                 retval = socket_select(fd_max + 1, &read_fds, NULL, NULL, &tv);
 359                 openocd_sleep_postlude();
 360
 361                 if (retval == -1)
 362                 {
 363 #ifdef _WIN32
 364
 365                         errno = WSAGetLastError();
 366
 367                         if (errno == WSAEINTR)
 368                                 FD_ZERO(&read_fds);
 369                         else
 370                         {
 371                                 LOG_ERROR("error during select: %s", strerror(errno));
 372                                 exit(-1);
 373                         }
 374 #else
 375
 376                         if (errno == EINTR)
 377                         {
 378                                 FD_ZERO(&read_fds);
 379                         }
 380                         else
 381                         {
 382                                 LOG_ERROR("error during select: %s", strerror(errno));
 383                                 exit(-1);
 384                         }
 385 #endif
 386                 }
 387
 388                 target_call_timer_callbacks();
 389                 process_jim_events ();
 390
 391                 if (retval == 0)
 392                 {
 393                         /* do regular tasks after at most 100ms */
 394                         tv.tv_sec = 0;
 395                         tv.tv_usec = 10000;
 396                         FD_ZERO(&read_fds); /* eCos leaves read_fds unchanged in this case!  */
 397                 }
 398
 399                 for (service = services; service; service = service->next)
 400                 {
 401                         /* handle new connections on listeners */
 402                         if ((service->fd != -1)
 403                                 && (FD_ISSET(service->fd, &read_fds)))
 404                         {
 405                                 if (service->max_connections > 0)
 406                                 {
 407                                         add_connection(service, command_context);
 408                                 }
 409                                 else
 410                                 {
 411                                         if (service->type != CONNECTION_PIPE)
 412                                         {
 413                                                 struct sockaddr_in sin;
 414                                                 socklen_t address_size = sizeof(sin);
 415                                                 int tmp_fd;
 416                                                 tmp_fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
 417                                                 close_socket(tmp_fd);
 418                                         }
 419                                         LOG_INFO("rejected '%s' connection, no more connections allowed", service->name);
 420                                 }
 421                         }
 422
 423                         /* handle activity on connections */
 424                         if (service->connections)
 425                         {
 426                                 struct connection *c;
 427
 428                                 for (c = service->connections; c;)
 429                                 {
 430                                         if ((FD_ISSET(c->fd, &read_fds)) || c->input_pending)
 431                                         {
 432                                                 if ((retval = service->input(c)) != ERROR_OK)
 433                                                 {
 434                                                         struct connection *next = c->next;
 435                                                         if (service->type == CONNECTION_PIPE)
 436                                                         {
 437                                                                 /* if connection uses a pipe then shutdown openocd on error */
 438                                                                 shutdown_openocd = 1;
 439                                                         }
 440                                                         remove_connection(service, c);
 441                                                         LOG_INFO("dropped '%s' connection - error %d", service->name, retval);
 442                                                         c = next;
 443                                                         continue;
 444                                                 }
 445                                         }
 446                                         c = c->next;
 447                                 }
 448                         }
 449                 }
 450
 451 #ifndef _WIN32
 452 #if BUILD_ECOSBOARD == 0
 453                 /* check for data on stdin if not using pipes */
 454                 if (server_use_pipes == 0)
 455                 {
 456                         if (FD_ISSET(fileno(stdin), &read_fds))
 457                         {
 458                                 if (getc(stdin) == 'x')
 459                                 {
 460                                         shutdown_openocd = 1;
 461                                 }
 462                         }
 463                 }
 464 #endif
 465 #else
 466                 MSG msg;
 467                 while (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
 468                 {
 469                         if (msg.message == WM_QUIT)
 470                                 shutdown_openocd = 1;
 471                 }
 472 #endif
 473         }
 474
 475         return ERROR_OK;
 476 }
 477
 478 #ifdef _WIN32
 479 BOOL WINAPI ControlHandler(DWORD dwCtrlType)
 480 {
 481         shutdown_openocd = 1;
 482         return TRUE;
 483 }
 484
 485 void sig_handler(int sig) {
 486         shutdown_openocd = 1;
 487 }
 488 #endif
 489
 490 int server_init(void)
 491 {
 492 #ifdef _WIN32
 493         WORD wVersionRequested;
 494         WSADATA wsaData;
 495
 496         wVersionRequested = MAKEWORD(2, 2);
 497
 498         if (WSAStartup(wVersionRequested, &wsaData) != 0)
 499         {
 500                 LOG_ERROR("Failed to Open Winsock");
 501                 exit(-1);
 502         }
 503
 504         if (server_use_pipes == 0)
 505         {
 506                 /* register ctrl-c handler */
 507                 SetConsoleCtrlHandler(ControlHandler, TRUE);
 508         }
 509         else
 510         {
 511                 /* we are using pipes so ignore ctrl-c */
 512                 SetConsoleCtrlHandler(NULL, TRUE);
 513         }
 514
 515         signal(SIGINT, sig_handler);
 516         signal(SIGTERM, sig_handler);
 517         signal(SIGBREAK, sig_handler);
 518         signal(SIGABRT, sig_handler);
 519 #endif
 520
 521         return ERROR_OK;
 522 }
 523
 524 int server_quit(void)
 525 {
 526         remove_services();
 527
 528 #ifdef _WIN32
 529         WSACleanup();
 530         SetConsoleCtrlHandler(ControlHandler, FALSE);
 531 #endif
 532
 533         return ERROR_OK;
 534 }
 535
 536 /* tell the server we want to shut down */
 537 COMMAND_HANDLER(handle_shutdown_command)
 538 {
 539         shutdown_openocd = 1;
 540
 541         return ERROR_COMMAND_CLOSE_CONNECTION;
 542 }
 543
 544 int server_register_commands(command_context_t *context)
 545 {
 546         register_command(context, NULL, "shutdown",
 547                         handle_shutdown_command, COMMAND_ANY,
 548                         "shut the server down");
 549
 550         return ERROR_OK;
 551 }
 552
 553
 554 SERVER_PORT_COMMAND()
 555 {
 556         switch (argc) {
 557         case 0:
 558                 command_print(cmd_ctx, "%d", *out);
 559                 break;
 560         case 1:
 561         {
 562                 uint16_t port;
 563                 COMMAND_PARSE_NUMBER(u16, args[0], port);
 564                 *out = port;
 565                 break;
 566         }
 567         default:
 568                 return ERROR_INVALID_ARGUMENTS;
 569         }
 570         return ERROR_OK;
 571 }