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 #ifndef _WIN32
  56         int flag=1;
  57 #endif
  58
  59         c = malloc(sizeof(connection_t));
  60         c->fd = -1;
  61         memset(&c->sin, 0, sizeof(c->sin));
  62         c->cmd_ctx = copy_command_context(cmd_ctx);
  63         c->service = service;
  64         c->input_pending = 0;
  65         c->priv = NULL;
  66         c->next = NULL;
  67
  68         address_size = sizeof(c->sin);
  69 #ifndef _WIN32
  70         int segsize=65536;
  71         setsockopt(service->fd, IPPROTO_TCP, TCP_MAXSEG,  &segsize, sizeof(int));
  72         int window_size = 128 * 1024;
  73
  74         /* These setsockopt()s must happen before the accept() */
  75
  76         setsockopt(service->fd, SOL_SOCKET, SO_SNDBUF,
  77                  (char *) &window_size, sizeof(window_size));
  78
  79         setsockopt(service->fd, SOL_SOCKET, SO_RCVBUF,
  80                  (char *) &window_size, sizeof(window_size));
  81
  82 #endif
  83         c->fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
  84 #ifndef _WIN32
  85         // This increases performance dramatically for e.g. GDB load which
  86         // does not have a sliding window protocol.
  87     retval=setsockopt(c->fd,            /* socket affected */
  88                             IPPROTO_TCP,     /* set option at TCP level */
  89                             TCP_NODELAY,     /* name of option */
  90                             (char *) &flag,  /* the cast is historical
  91                                                     cruft */
  92                             sizeof(int));    /* length of option value */
  93     setsockopt(c->fd, IPPROTO_TCP, TCP_MAXSEG,  &segsize, sizeof(int));
  94 #endif
  95
  96
  97         LOG_INFO("accepting '%s' connection from %i", service->name, c->sin.sin_port);
  98         if ((retval = service->new_connection(c)) == ERROR_OK)
  99         {
 100         }
 101         else
 102         {
 103                 close_socket(c->fd);
 104                 LOG_ERROR("attempted '%s' connection rejected", service->name);
 105                 free(c);
 106                 return retval;
 107         }
 108
 109         /* add to the end of linked list */
 110         for (p = &service->connections; *p; p = &(*p)->next);
 111         *p = c;
 112
 113         service->max_connections--;
 114
 115         return ERROR_OK;
 116 }
 117
 118 int remove_connection(service_t *service, connection_t *connection)
 119 {
 120         connection_t **p = &service->connections;
 121         connection_t *c;
 122
 123         /* find connection */
 124         while((c = *p))
 125         {
 126                 if (c->fd == connection->fd)
 127                 {
 128                         service->connection_closed(c);
 129                         close_socket(c->fd);
 130                         command_done(c->cmd_ctx);
 131
 132                         /* delete connection */
 133                         *p = c->next;
 134                         free(c);
 135
 136                         service->max_connections++;
 137                         break;
 138                 }
 139
 140                 /* redirect p to next list pointer */
 141                 p = &(*p)->next;
 142         }
 143
 144         return ERROR_OK;
 145 }
 146
 147 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)
 148 {
 149         service_t *c, **p;
 150         int so_reuseaddr_option = 1;
 151
 152         c = malloc(sizeof(service_t));
 153
 154         c->name = strdup(name);
 155         c->type = type;
 156         c->port = port;
 157         c->max_connections = max_connections;
 158         c->fd = -1;
 159         c->connections = NULL;
 160         c->new_connection = new_connection_handler;
 161         c->input = input_handler;
 162         c->connection_closed = connection_closed_handler;
 163         c->priv = priv;
 164         c->next = NULL;
 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         if (listen(c->fd, 1) == -1)
 188         {
 189                 LOG_ERROR("couldn't listen on socket: %s", strerror(errno));
 190                 exit(-1);
 191         }
 192
 193         /* add to the end of linked list */
 194         for (p = &services; *p; p = &(*p)->next);
 195         *p = c;
 196
 197         return ERROR_OK;
 198 }
 199
 200 int remove_service(unsigned short port)
 201 {
 202         service_t **p = &services;
 203         service_t *c;
 204
 205         /* find service */
 206         while((c = *p))
 207         {
 208                 if (c->port == port)
 209                 {
 210                         if (c->name)
 211                                 free(c->name);
 212
 213                         if (c->priv)
 214                                 free(c->priv);
 215
 216                         /* delete service */
 217                         *p = c->next;
 218                         free(c);
 219                 }
 220
 221                 /* redirect p to next list pointer */
 222                 p = &(*p)->next;
 223         }
 224
 225         return ERROR_OK;
 226 }
 227
 228 int remove_services()
 229 {
 230         service_t *c = services;
 231
 232         /* loop service */
 233         while(c)
 234         {
 235                 service_t *next = c->next;
 236
 237                 if (c->name)
 238                         free(c->name);
 239
 240                 if (c->priv)
 241                         free(c->priv);
 242
 243                 /* delete service */
 244                 free(c);
 245
 246                 /* remember the last service for unlinking */
 247                 c = next;
 248         }
 249
 250         services = NULL;
 251
 252         return ERROR_OK;
 253 }
 254
 255 extern void lockBigLock();
 256 extern void unlockBigLock();
 257
 258 int server_loop(command_context_t *command_context)
 259 {
 260         service_t *service;
 261
 262         /* used in select() */
 263         fd_set read_fds;
 264         struct timeval tv;
 265         int fd_max;
 266
 267         /* used in accept() */
 268         int retval;
 269
 270 #ifndef _WIN32
 271         if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
 272                 LOG_ERROR("couldn't set SIGPIPE to SIG_IGN");
 273 #endif
 274
 275         // This function is reentrant(workaround for configuration problems)
 276         static int lockCount=0;
 277         if (lockCount++==0)
 278         {
 279                 lockBigLock();
 280         }
 281
 282         /* do regular tasks after at most 10ms */
 283         tv.tv_sec = 0;
 284         tv.tv_usec = 10000;
 285
 286         while(!shutdown_openocd)
 287         {
 288                 /* monitor sockets for acitvity */
 289                 fd_max = 0;
 290                 FD_ZERO(&read_fds);
 291
 292                 /* add service and connection fds to read_fds */
 293                 for (service = services; service; service = service->next)
 294                 {
 295                         if (service->fd != -1)
 296                         {
 297                                 /* listen for new connections */
 298                                 FD_SET(service->fd, &read_fds);
 299
 300                                 if (service->fd > fd_max)
 301                                         fd_max = service->fd;
 302                         }
 303
 304                         if (service->connections)
 305                         {
 306                                 connection_t *c;
 307
 308                                 for (c = service->connections; c; c = c->next)
 309                                 {
 310                                         /* check for activity on the connection */
 311                                         FD_SET(c->fd, &read_fds);
 312                                         if (c->fd > fd_max)
 313                                                 fd_max = c->fd;
 314                                 }
 315                         }
 316                 }
 317
 318 #ifndef _WIN32
 319 #ifndef BUILD_ECOSBOARD
 320                 /* add STDIN to read_fds */
 321                 FD_SET(fileno(stdin), &read_fds);
 322 #endif
 323 #endif
 324
 325                 // Only while we're sleeping we'll let others run
 326                 unlockBigLock();
 327                 retval = select(fd_max + 1, &read_fds, NULL, NULL, &tv);
 328                 lockBigLock();
 329
 330                 if (retval == -1)
 331                 {
 332 #ifdef _WIN32
 333
 334                         errno = WSAGetLastError();
 335
 336                         if (errno == WSAEINTR)
 337                                 FD_ZERO(&read_fds);
 338                         else
 339                         {
 340                                 LOG_ERROR("error during select: %s", strerror(errno));
 341                                 exit(-1);
 342                         }
 343 #else
 344
 345                         if (errno == EINTR)
 346                         {
 347                                 FD_ZERO(&read_fds);
 348                         }
 349                         else
 350                         {
 351                                 LOG_ERROR("error during select: %s", strerror(errno));
 352                                 exit(-1);
 353                         }
 354 #endif
 355                 }
 356
 357                 target_call_timer_callbacks();
 358
 359                 if (retval == 0)
 360                 {
 361                         /* do regular tasks after at most 100ms */
 362                         tv.tv_sec = 0;
 363                         tv.tv_usec = 10000;
 364                         FD_ZERO(&read_fds); /* eCos leaves read_fds unchanged in this case!  */
 365                 }
 366
 367                 for (service = services; service; service = service->next)
 368                 {
 369                         /* handle new connections on listeners */
 370                         if ((service->fd != -1)
 371                                 && (FD_ISSET(service->fd, &read_fds)))
 372                         {
 373                                 if (service->max_connections > 0)
 374                                 {
 375                                         add_connection(service, command_context);
 376                                 }
 377                                 else
 378                                 {
 379                                         struct sockaddr_in sin;
 380                                         unsigned int address_size = sizeof(sin);
 381                                         int tmp_fd;
 382                                         tmp_fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
 383                                         close_socket(tmp_fd);
 384                                         LOG_INFO("rejected '%s' connection, no more connections allowed", service->name);
 385                                 }
 386                         }
 387
 388                         /* handle activity on connections */
 389                         if (service->connections)
 390                         {
 391                                 connection_t *c;
 392
 393                                 for (c = service->connections; c;)
 394                                 {
 395                                         if ((FD_ISSET(c->fd, &read_fds)) || c->input_pending)
 396                                         {
 397                                                 if (service->input(c) != ERROR_OK)
 398                                                 {
 399                                                         connection_t *next = c->next;
 400                                                         remove_connection(service, c);
 401                                                         LOG_INFO("dropped '%s' connection", service->name);
 402                                                         c = next;
 403                                                         continue;
 404                                                 }
 405                                         }
 406                                         c = c->next;
 407                                 }
 408                         }
 409                 }
 410
 411 #ifndef _WIN32
 412 #ifndef BUILD_ECOSBOARD
 413                 if (FD_ISSET(fileno(stdin), &read_fds))
 414                 {
 415                         if (getc(stdin) == 'x')
 416                         {
 417                                 shutdown_openocd = 1;
 418                         }
 419                 }
 420 #endif
 421 #else
 422                 MSG msg;
 423                 while (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
 424                 {
 425                         if (msg.message == WM_QUIT)
 426                                 shutdown_openocd = 1;
 427                 }
 428 #endif
 429         }
 430         if (--lockCount==0)
 431         {
 432                 unlockBigLock();
 433         }
 434
 435         return ERROR_OK;
 436 }
 437
 438 #ifdef _WIN32
 439 BOOL WINAPI ControlHandler(DWORD dwCtrlType)
 440 {
 441     shutdown_openocd = 1;
 442     return TRUE;
 443 }
 444
 445 void sig_handler(int sig) {
 446     shutdown_openocd = 1;
 447 }
 448 #endif
 449
 450 int server_init()
 451 {
 452 #ifdef _WIN32
 453         WORD wVersionRequested;
 454         WSADATA wsaData;
 455
 456         wVersionRequested = MAKEWORD( 2, 2 );
 457
 458         if (WSAStartup(wVersionRequested, &wsaData) != 0)
 459         {
 460                 LOG_ERROR("Failed to Open Winsock");
 461                 exit(-1);
 462         }
 463
 464         SetConsoleCtrlHandler( ControlHandler, TRUE );
 465
 466         signal(SIGINT, sig_handler);
 467         signal(SIGTERM, sig_handler);
 468         signal(SIGBREAK, sig_handler);
 469         signal(SIGABRT, sig_handler);
 470 #endif
 471
 472
 473         return ERROR_OK;
 474 }
 475
 476 int server_quit()
 477 {
 478         remove_services();
 479
 480 #ifdef _WIN32
 481         WSACleanup();
 482         SetConsoleCtrlHandler( ControlHandler, FALSE );
 483 #endif
 484
 485         return ERROR_OK;
 486 }
 487
 488 int server_register_commands(command_context_t *context)
 489 {
 490         register_command(context, NULL, "shutdown", handle_shutdown_command,
 491                                          COMMAND_ANY, "shut the server down");
 492
 493         return ERROR_OK;
 494 }
 495
 496 /* tell the server we want to shut down */
 497 int handle_shutdown_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 498 {
 499         shutdown_openocd = 1;
 500
 501         return ERROR_COMMAND_CLOSE_CONNECTION;
 502 }
 503
 504