369 lines
8.4 KiB
C
369 lines
8.4 KiB
C
/***************************************************************************
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* Copyright (C) 2005 by Dominic Rath *
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* Dominic.Rath@gmx.de *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include "server.h"
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#include "log.h"
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#include "telnet_server.h"
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#include "target.h"
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#include <command.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <fcntl.h>
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#include <signal.h>
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service_t *services = NULL;
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/* shutdown_openocd == 1: exit the main event loop, and quit the debugger */
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static int shutdown_openocd = 0;
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int handle_shutdown_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
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int add_connection(service_t *service, command_context_t *cmd_ctx)
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{
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unsigned int address_size;
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connection_t *c, *p;
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int retval;
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c = malloc(sizeof(connection_t));
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c->fd = -1;
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memset(&c->sin, 0, sizeof(c->sin));
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c->cmd_ctx = copy_command_context(cmd_ctx);
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c->service = service;
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c->input_pending = 0;
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c->priv = NULL;
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c->next = NULL;
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address_size = sizeof(c->sin);
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c->fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
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if ((retval = service->new_connection(c)) == ERROR_OK)
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{
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INFO("accepted '%s' connection from %i", service->name, c->sin.sin_port);
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}
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else
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{
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close(c->fd);
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INFO("attempted '%s' connection rejected", service->name);
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free(c);
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}
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if (service->connections)
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{
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for (p = service->connections; p && p->next; p = p->next);
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if (p)
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p->next = c;
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}
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else
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{
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service->connections = c;
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}
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service->max_connections--;
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return ERROR_OK;
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}
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int remove_connection(service_t *service, connection_t *connection)
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{
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connection_t *c, *p = NULL;
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/* find connection */
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for (c = service->connections; c; c = c->next)
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{
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if (c->fd == connection->fd)
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{
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/* unlink connection */
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if (p)
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p->next = c->next;
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else
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service->connections = c->next;
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service->connection_closed(c);
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close(c->fd);
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command_done(c->cmd_ctx);
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/* delete connection */
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free(c);
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service->max_connections++;
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break;
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}
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/* remember the last connection for unlinking */
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p = c;
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}
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return ERROR_OK;
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}
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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)
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{
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service_t *c, *p;
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int so_reuseaddr_option = 1;
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int oldopts;
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c = malloc(sizeof(service_t));
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c->name = strdup(name);
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c->type = type;
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c->port = port;
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c->max_connections = max_connections;
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c->fd = -1;
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c->connections = NULL;
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c->new_connection = new_connection_handler;
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c->input = input_handler;
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c->connection_closed = connection_closed_handler;
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c->priv = priv;
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c->next = NULL;
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if ((c->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
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{
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ERROR("error creating socket: %s", strerror(errno));
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exit(-1);
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}
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setsockopt(c->fd, SOL_SOCKET, SO_REUSEADDR, &so_reuseaddr_option, sizeof(int));
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oldopts = fcntl(c->fd, F_GETFL, 0);
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fcntl(c->fd, F_SETFL, oldopts | O_NONBLOCK);
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memset(&c->sin, 0, sizeof(c->sin));
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c->sin.sin_family = AF_INET;
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c->sin.sin_addr.s_addr = INADDR_ANY;
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c->sin.sin_port = htons(port);
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if (bind(c->fd, (struct sockaddr *)&c->sin, sizeof(c->sin)) == -1)
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{
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ERROR("couldn't bind to socket: %s", strerror(errno));
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exit(-1);
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}
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if (listen(c->fd, 1) == -1)
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{
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ERROR("couldn't listen on socket: %s", strerror(errno));
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exit(-1);
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}
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if (services)
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{
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for (p = services; p && p->next; p = p->next);
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if (p)
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p->next = c;
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}
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else
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{
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services = c;
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}
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return ERROR_OK;
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}
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int remove_service(unsigned short port)
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{
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service_t *c, *p = NULL;
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/* find service */
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for (c = services; c; c = c->next)
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{
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if (c->port == port)
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{
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/* unlink service */
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if (p)
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p->next = c->next;
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else
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services = c->next;
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if (c->name)
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free(c->name);
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/* delete service */
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free(c);
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}
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/* remember the last service for unlinking */
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p = c;
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}
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return ERROR_OK;
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}
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int server_loop(command_context_t *command_context)
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{
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service_t *service;
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/* used in select() */
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fd_set read_fds;
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struct timeval tv;
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int fd_max;
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/* used in accept() */
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int retval;
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if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
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ERROR("couldn't set SIGPIPE to SIG_IGN");
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/* do regular tasks after at most 10ms */
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tv.tv_sec = 0;
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tv.tv_usec = 10000;
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while(!shutdown_openocd)
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{
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/* monitor sockets for acitvity */
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fd_max = 0;
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FD_ZERO(&read_fds);
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/* add service and connection fds to read_fds */
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for (service = services; service; service = service->next)
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{
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if (service->fd != -1)
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{
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/* listen for new connections */
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FD_SET(service->fd, &read_fds);
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if (service->fd > fd_max)
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fd_max = service->fd;
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}
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if (service->connections)
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{
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connection_t *c;
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for (c = service->connections; c; c = c->next)
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{
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/* check for activity on the connection */
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FD_SET(c->fd, &read_fds);
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if (c->fd > fd_max)
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fd_max = c->fd;
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}
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}
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}
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/* add STDIN to read_fds */
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FD_SET(fileno(stdin), &read_fds);
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if ((retval = select(fd_max + 1, &read_fds, NULL, NULL, &tv)) == -1)
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{
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if (errno == EINTR)
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FD_ZERO(&read_fds);
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else
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{
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ERROR("error during select: %s", strerror(errno));
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exit(-1);
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}
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}
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target_call_timer_callbacks();
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if (retval == 0)
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{
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/* do regular tasks after at most 100ms */
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tv.tv_sec = 0;
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tv.tv_usec = 10000;
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#if 0
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if (shutdown_openocd)
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return ERROR_COMMAND_CLOSE_CONNECTION;
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handle_target();
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#endif
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}
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for (service = services; service; service = service->next)
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{
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/* handle new connections on listeners */
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if ((service->fd != -1)
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&& (FD_ISSET(service->fd, &read_fds)))
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{
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if (service->max_connections > 0)
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add_connection(service, command_context);
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else
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{
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struct sockaddr_in sin;
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unsigned int address_size = sizeof(sin);
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int tmp_fd;
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tmp_fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
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close(tmp_fd);
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INFO("rejected '%s' connection, no more connections allowed", service->name);
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}
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}
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/* handle activity on connections */
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if (service->connections)
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{
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connection_t *c;
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for (c = service->connections; c;)
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{
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if ((FD_ISSET(c->fd, &read_fds)) || c->input_pending)
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{
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if (service->input(c) != ERROR_OK)
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{
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connection_t *next = c->next;
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remove_connection(service, c);
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INFO("dropped '%s' connection", service->name);
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c = next;
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continue;
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}
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}
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c = c->next;
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}
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}
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}
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if (FD_ISSET(fileno(stdin), &read_fds))
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{
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if (getc(stdin) == 'x')
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{
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shutdown_openocd = 1;
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}
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}
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}
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return ERROR_OK;
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}
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int server_init()
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{
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return ERROR_OK;
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}
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int server_register_commands(command_context_t *context)
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{
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register_command(context, NULL, "shutdown", handle_shutdown_command,
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COMMAND_ANY, "shut the server down");
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return ERROR_OK;
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}
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/* tell the server we want to shut down */
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int handle_shutdown_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
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{
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shutdown_openocd = 1;
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return ERROR_COMMAND_CLOSE_CONNECTION;
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}
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