[openocd.git] / src / server / server.c

/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
 *   Copyright (C) 2007,2008 Øyvind Harboe                                      *
 *   oyvind.harboe@zylin.com                                               *
 *                                                                         *
 *   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>
#ifndef _WIN32
#include <netinet/tcp.h>
#endif

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;
        int flag=1;
        
        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);
        
        /* This increases performance dramatically for e.g. GDB load which
         * does not have a sliding window protocol. */
        retval=setsockopt(c->fd,        /* socket affected */
                        IPPROTO_TCP,            /* set option at TCP level */
                        TCP_NODELAY,            /* name of option */
                        (char *)&flag,          /* the cast is historical cruft */
                        sizeof(int));           /* length of option value */
                
        LOG_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);
                LOG_ERROR("attempted '%s' connection rejected", service->name);
                free(c);
                return retval;
        }
        
        /* 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 */
        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)
        {
                LOG_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)
        {
                LOG_ERROR("couldn't bind to socket: %s", strerror(errno));
                exit(-1);
        }
        
#ifndef _WIN32
        int segsize=65536;
        setsockopt(c->fd, IPPROTO_TCP, TCP_MAXSEG,  &segsize, sizeof(int));
#endif
        int window_size = 128 * 1024;   

        /* These setsockopt()s must happen before the listen() */
        
        setsockopt(c->fd, SOL_SOCKET, SO_SNDBUF,
                (char *)&window_size, sizeof(window_size));
        setsockopt(c->fd, SOL_SOCKET, SO_RCVBUF,
                (char *)&window_size, sizeof(window_size));
        
        if (listen(c->fd, 1) == -1)
        {
                LOG_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 */
        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(void)
{
        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;
}

extern void openocd_sleep_prelude(void);
extern void openocd_sleep_postlude(void);

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)
                LOG_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
#if BUILD_ECOSBOARD == 0
                /* add STDIN to read_fds */
                FD_SET(fileno(stdin), &read_fds);
#endif
#endif

                openocd_sleep_prelude();
                kept_alive();
                // Only while we're sleeping we'll let others run
                retval = select(fd_max + 1, &read_fds, NULL, NULL, &tv);
                openocd_sleep_postlude();

                if (retval == -1)
                {
#ifdef _WIN32

                        errno = WSAGetLastError();

                        if (errno == WSAEINTR)
                                FD_ZERO(&read_fds);
                        else
                        {
                                LOG_ERROR("error during select: %s", strerror(errno));
                                exit(-1);
                        }
#else

                        if (errno == EINTR)
                        {
                                FD_ZERO(&read_fds);
                        }
                        else
                        {
                                LOG_ERROR("error during select: %s", strerror(errno));
                                exit(-1);
                        }
#endif
                }
                
                target_call_timer_callbacks();
                process_jim_events ();

                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);
                                        LOG_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);
                                                        LOG_INFO("dropped '%s' connection", service->name);
                                                        c = next;
                                                        continue;
                                                }
                                        }
                                        c = c->next;
                                }
                        }
                }
                
#ifndef _WIN32
#if BUILD_ECOSBOARD == 0
                if (FD_ISSET(fileno(stdin), &read_fds))
                {
                        if (getc(stdin) == 'x')
                        {
                                shutdown_openocd = 1;
                        }
                }
#endif
#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(void)
{
#ifdef _WIN32
        WORD wVersionRequested;
        WSADATA wsaData;

        wVersionRequested = MAKEWORD( 2, 2 );

        if (WSAStartup(wVersionRequested, &wsaData) != 0)
        {
                LOG_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(void)
{
        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;
}