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  • /***************************************************************************
     *   Copyright (C) 2005 by Dominic Rath                                    *
     *   Dominic.Rath@gmx.de                                                   *
     *                                                                         *
     *   This program is free software; you can redistribute it and/or modify  *
     *   it under the terms of the GNU General Public License as published by  *
     *   the Free Software Foundation; either version 2 of the License, or     *
     *   (at your option) any later version.                                   *
     *                                                                         *
     *   This program is distributed in the hope that it will be useful,       *
     *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
     *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
     *   GNU General Public License for more details.                          *
     *                                                                         *
     *   You should have received a copy of the GNU General Public License     *
     *   along with this program; if not, write to the                         *
     *   Free Software Foundation, Inc.,                                       *
     *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
     ***************************************************************************/
    #ifdef HAVE_CONFIG_H
    #include "config.h"
    #endif
    
    #include "replacements.h"
    
    #include "server.h"
    
    #include "log.h"
    #include "telnet_server.h"
    #include "target.h"
    
    #include <command.h>
    #include <string.h>
    #include <stdlib.h>
    #include <errno.h>
    #include <unistd.h>
    #include <sys/types.h>
    #include <fcntl.h>
    #include <signal.h>
    
    service_t *services = NULL;
    
    /* shutdown_openocd == 1: exit the main event loop, and quit the debugger */
    static int shutdown_openocd = 0;
    int handle_shutdown_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
    
    int add_connection(service_t *service, command_context_t *cmd_ctx)
    {
    	unsigned int address_size;
    	connection_t *c, **p;
    	int retval;
    	
    	c = malloc(sizeof(connection_t));
    	c->fd = -1;
    	memset(&c->sin, 0, sizeof(c->sin));
    	c->cmd_ctx = copy_command_context(cmd_ctx);
    	c->service = service;
    	c->input_pending = 0;
    	c->priv = NULL;
    	c->next = NULL;
    
    	address_size = sizeof(c->sin);
    	c->fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
    				
    
    				
    	INFO("accepting '%s' connection from %i", service->name, c->sin.sin_port);
    
    	if ((retval = service->new_connection(c)) == ERROR_OK)
    	{
    	}
    	else
    	{
    		close_socket(c->fd);
    
    		ERROR("attempted '%s' connection rejected", service->name);
    
    		free(c);
    
    	}
    	
    	/* add to the end of linked list */
    	for (p = &service->connections; *p; p = &(*p)->next);
    	*p = c;
    	
    	service->max_connections--;
    	
    	return ERROR_OK;
    }
    
    int remove_connection(service_t *service, connection_t *connection)
    {
    	connection_t **p = &service->connections;
    	connection_t *c;
    	
    	/* find connection */
    
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    	while((c = *p))
    
    	{		
    		if (c->fd == connection->fd)
    		{	
    			service->connection_closed(c);
    			close_socket(c->fd);
    			command_done(c->cmd_ctx);
    			
    			/* delete connection */
    			*p = c->next;
    			free(c);
    			
    			service->max_connections++;
    			break;
    		}
    		
    		/* redirect p to next list pointer */
    		p = &(*p)->next;		
    	}
    	
    	return ERROR_OK;
    }
    
    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)
    {
    	service_t *c, **p;
    	int so_reuseaddr_option = 1;
    	
    	c = malloc(sizeof(service_t));
    	
    	c->name = strdup(name);
    	c->type = type;
    	c->port = port;
    	c->max_connections = max_connections;
    	c->fd = -1;
    	c->connections = NULL;
    	c->new_connection = new_connection_handler;
    	c->input = input_handler;
    	c->connection_closed = connection_closed_handler;
    	c->priv = priv;
    	c->next = NULL;
    	
    	if ((c->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    	{
    		ERROR("error creating socket: %s", strerror(errno));
    		exit(-1);
    	}
    	
    	setsockopt(c->fd, SOL_SOCKET, SO_REUSEADDR, (void*)&so_reuseaddr_option, sizeof(int));
    	
    	socket_nonblock(c->fd);
    	
    	memset(&c->sin, 0, sizeof(c->sin));
    	c->sin.sin_family = AF_INET;
    	c->sin.sin_addr.s_addr = INADDR_ANY;
    	c->sin.sin_port = htons(port);
    	
    	if (bind(c->fd, (struct sockaddr *)&c->sin, sizeof(c->sin)) == -1)
    	{
    		ERROR("couldn't bind to socket: %s", strerror(errno));
    		exit(-1);
    	}
    	
    	if (listen(c->fd, 1) == -1)
    	{
    		ERROR("couldn't listen on socket: %s", strerror(errno));
    		exit(-1);
    	}
    	
    	/* add to the end of linked list */
    	for (p = &services; *p; p = &(*p)->next);
    	*p = c;
    	
    	return ERROR_OK;
    }
    
    int remove_service(unsigned short port)
    {
    	service_t **p = &services;
    	service_t *c;
    	
    	/* find service */
    
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    	while((c = *p))
    
    	{		
    		if (c->port == port)
    		{	
    			if (c->name)
    				free(c->name);
    			
    			if (c->priv)
    				free(c->priv);
    			
    			/* delete service */
    			*p = c->next;
    			free(c);
    		}
    
    		/* redirect p to next list pointer */
    		p = &(*p)->next;
    	}
    	
    	return ERROR_OK;
    }
    
    int remove_services()
    {
    	service_t *c = services;
    
    	/* loop service */
    	while(c)
    	{
    		service_t *next = c->next;
    
    		if (c->name)
    			free(c->name);
    
    		if (c->priv)
    			free(c->priv);
    
    		/* delete service */
    		free(c);
    
    		/* remember the last service for unlinking */
    		c = next;
    	}
    
    	services = NULL;
    	
    	return ERROR_OK;
    }
    
    int server_loop(command_context_t *command_context)
    {
    	service_t *service;
    
    	/* used in select() */
    	fd_set read_fds;
    	struct timeval tv;
    	int fd_max;
    	
    	/* used in accept() */
    	int retval;
    	
    #ifndef _WIN32
    	if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
    		ERROR("couldn't set SIGPIPE to SIG_IGN");
    #endif
    	
    	/* do regular tasks after at most 10ms */
    	tv.tv_sec = 0;
    	tv.tv_usec = 10000;
    	
    	while(!shutdown_openocd)
    	{
    		/* monitor sockets for acitvity */
    		fd_max = 0;
    		FD_ZERO(&read_fds);
    
    		/* add service and connection fds to read_fds */
    		for (service = services; service; service = service->next)
    		{
    			if (service->fd != -1)
    			{
    				/* listen for new connections */
    				FD_SET(service->fd, &read_fds);
    
    				if (service->fd > fd_max)
    					fd_max = service->fd;
    			}
    			
    			if (service->connections)
    			{
    				connection_t *c;
    				
    				for (c = service->connections; c; c = c->next)
    				{
    					/* check for activity on the connection */
    					FD_SET(c->fd, &read_fds);
    					if (c->fd > fd_max)
    						fd_max = c->fd;
    				}
    			}
    		}
    		
    #ifndef _WIN32
    		/* add STDIN to read_fds */
    		FD_SET(fileno(stdin), &read_fds);
    #endif
    
    		retval = select(fd_max + 1, &read_fds, NULL, NULL, &tv);
    		
    		if (retval == -1)
    		{
    #ifdef _WIN32
    
    			errno = WSAGetLastError();
    
    			if (errno == WSAEINTR)
    				FD_ZERO(&read_fds);
    			else
    			{
    				ERROR("error during select: %s", strerror(errno));
    				exit(-1);
    			}
    #else
    
    			if (errno == EINTR)
    			{
    				FD_ZERO(&read_fds);
    			}
    			else
    			{
    				ERROR("error during select: %s", strerror(errno));
    				exit(-1);
    			}
    #endif
    		}
    		
    		target_call_timer_callbacks();
    
    		if (retval == 0)
    		{
    			/* do regular tasks after at most 100ms */
    			tv.tv_sec = 0;
    			tv.tv_usec = 10000;
    			FD_ZERO(&read_fds); /* eCos leaves read_fds unchanged in this case!  */
    		}
    		
    		for (service = services; service; service = service->next)
    		{
    			/* handle new connections on listeners */
    			if ((service->fd != -1) 
    				&& (FD_ISSET(service->fd, &read_fds))) 
    			{
    				if (service->max_connections > 0)
    				{
    					add_connection(service, command_context);
    				}
    				else
    				{
    					struct sockaddr_in sin;
    					unsigned int address_size = sizeof(sin);
    					int tmp_fd;
    					tmp_fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
    					close_socket(tmp_fd);
    					INFO("rejected '%s' connection, no more connections allowed", service->name);
    				}
    			}
    			
    			/* handle activity on connections */
    			if (service->connections)
    			{
    				connection_t *c;
    				
    				for (c = service->connections; c;)
    				{
    					if ((FD_ISSET(c->fd, &read_fds)) || c->input_pending)
    					{
    						if (service->input(c) != ERROR_OK)
    						{
    							connection_t *next = c->next;
    							remove_connection(service, c);
    							INFO("dropped '%s' connection", service->name);
    							c = next;
    							continue;
    						}
    					}
    					c = c->next;
    				}
    			}
    		}
    		
    #ifndef _WIN32
    		if (FD_ISSET(fileno(stdin), &read_fds))
    		{
    			if (getc(stdin) == 'x')
    			{
    				shutdown_openocd = 1;
    			}
    		}
    #else
    		MSG msg;
    		while (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
    		{
    			if (msg.message == WM_QUIT)
    				shutdown_openocd = 1;
    		}
    #endif
    	}
    	
    	return ERROR_OK;
    }
    
    #ifdef _WIN32
    BOOL WINAPI ControlHandler(DWORD dwCtrlType)
    {
        shutdown_openocd = 1;
        return TRUE;
    }
    
    void sig_handler(int sig) {
        shutdown_openocd = 1;
    }
    #endif
    
    int server_init()
    {
    #ifdef _WIN32
    	WORD wVersionRequested;
    	WSADATA wsaData;
    
    	wVersionRequested = MAKEWORD( 2, 2 );
    
    	if (WSAStartup(wVersionRequested, &wsaData) != 0)
    	{
    		ERROR("Failed to Open Winsock");
    		exit(-1);
    	}
    
    	SetConsoleCtrlHandler( ControlHandler, TRUE );
    
    	signal(SIGINT, sig_handler);
    	signal(SIGTERM, sig_handler);
    	signal(SIGBREAK, sig_handler);
    	signal(SIGABRT, sig_handler);
    #endif
    
    	
    	return ERROR_OK;
    }
    
    int server_quit()
    {
    	remove_services();
    
    #ifdef _WIN32
    	WSACleanup();
    	SetConsoleCtrlHandler( ControlHandler, FALSE );
    #endif
    
    	return ERROR_OK;
    }
    
    int server_register_commands(command_context_t *context)
    {
    	register_command(context, NULL, "shutdown", handle_shutdown_command,
    					 COMMAND_ANY, "shut the server down");
    	
    	return ERROR_OK;
    }
    
    /* tell the server we want to shut down */
    int handle_shutdown_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
    {
    	shutdown_openocd = 1;
    
    	return ERROR_COMMAND_CLOSE_CONNECTION;
    }