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unixnfc.cpp

#include "system.h"
#include "indian.hpp"
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <sys/fcntl.h>
#include <fcntl.h>


#include "netface.hpp"
#include "nfserver.hpp"
#include "view.hpp"
#include "objects.hpp"
#include "level.hpp"
#include "timing.hpp"
#include "server2.hpp"
#include "game.hpp"
#include "jwindow.hpp"

extern char lsf[256];

#define DIN_NAME "/tmp/.abuse_ndrv_out"   // opposite of driver's in/out
#define DOUT_NAME "/tmp/.abuse_ndrv_in"

#define uchar unsigned char
#define ushort unsigned short

#define real2shm(type,ptr) (ptr==NULL ? NULL : ((type *)((char *)(ptr)-(char *)base)))
#define shm2real(type,ptr) (ptr==NULL ? NULL : ((type *)((long)(ptr)+(long)(base))))

#ifdef __sgi
#define next_process() sginap(0)
#else
#define next_process() usleep(1)
#endif

extern int crc_man_write_crc_file(char *filename);
int net_installed=0,net_out_fd,net_in_fd;
int net_child=-1;
int local_client_number=0;

void *shm_addr=(void *)-1;  // shmat returns -1 on failure
base_memory_struct *base;   // points to shm_addr
base_memory_struct local_base;

net_address *net_server=NULL;

extern int registered;

int net_start() 
{ 
  return net_server!=NULL; 
}


int kill_net()
{

  if (net_installed)
  {
    char cmd=EGCMD_DIE;
    write(net_out_fd,&cmd,1);
    read(net_in_fd,&cmd,1);
    close(net_out_fd);
    close(net_in_fd);
  }

  if (net_child!=-1)
  {
    kill(net_child,SIGINT);
    net_child=-1;    
  }

  net_installed=0;
  if (shm_addr!=(void *)-1)
  {
    shmdt((char *)shm_addr);
    shm_addr=(void *)-1;
    base=&local_base;
  }
}

void net_uninit()
{
  kill_net();
}

int net_init(int argc, char **argv)
{
  int i,p1=-1,no_fork=0;
  base=&local_base;
  char *server_name=NULL;

  for (i=1;i<argc;i++) 
    if (!strcmp(argv[i],"-nonet"))
      return 0;
    else if (!strcmp(argv[i],"-no_net_fork"))      // make it easy to run the driver under a debugger
      no_fork=1;
    else if (!strcmp(argv[i],"-port"))
    {
      if (i==argc-1 || !sscanf(argv[i+1],"%d",&p1))
      {
        fprintf(stderr,"bad value folloing -port");
      return 0;
      }
    } else if (!strcmp(argv[i],"-net") && i<argc-1)
    {
      i++;
      server_name=argv[i];      
    }

      
    
  char cmd[50];
  if (p1!=-1) 
    sprintf(cmd,"undrv runme -port %d",p1);
  else sprintf(cmd,"undrv runme");

  if (!no_fork)
  {
    FILE *fp=popen(cmd,"rb");
    if (!fp || !fscanf(fp,"%d",&net_child) || net_child==-1)
    { fprintf(stderr,"could not run undrv, please make sure it's in your path\n");
      return 0;
    }

    if (fp) pclose(fp);
  }

  do
  { sleep(0);
  } while (access(DIN_NAME,R_OK)); 
  net_in_fd=open(DIN_NAME,O_RDWR);

  do
  { sleep(0);
  } while (access(DOUT_NAME,W_OK)); 
  net_out_fd=open(DOUT_NAME,O_RDWR);


  if (write(net_out_fd,&registered,sizeof(registered))!=sizeof(registered))
    return 0;

  int shm_seg_id;
  if (read(net_in_fd,&shm_seg_id,sizeof(shm_seg_id))!=sizeof(shm_seg_id))
    return 0;

  shm_addr=shmat(shm_seg_id,NULL,0);  // attach as read/write
  if (shm_addr==(void *)-1)
    return 0;

  char ack=1;   // acknodge we read and attached
  if (write(net_out_fd,&ack,1)!=1)
    return 0;  


  base=(base_memory_struct *)shm_addr;

  net_installed=1;
      
  return 1;
}

#include <unistd.h>
#include <sys/time.h>

int NF_set_file_server(char *name)
{
  if (net_installed)
  {
    char cm[2]={NFCMD_SET_FS,strlen(name)+1};
    if (write(net_out_fd,cm,2)!=2) { kill_net(); return 0; }
    if (write(net_out_fd,name,cm[1])!=cm[1]) { kill_net(); return 0; }
    if (read(net_in_fd,cm,1)!=1)  { kill_net(); return 0; }   // read the status of this command
    next_process();
    return cm[0];
  } else return 0; 
}

int NF_open_file(char *filename, char *mode)
{
  if (net_installed)
  {
    char cm[3]={NFCMD_OPEN,strlen(filename)+1,strlen(mode)+1};
    if (write(net_out_fd,cm,3)!=3) { kill_net(); return -1; }
    if (write(net_out_fd,filename,cm[1])!=cm[1])  { kill_net(); return -1; }
    if (write(net_out_fd,mode,cm[2])!=cm[2])  { kill_net(); return -1; }

    uchar file_type;
    if (read(net_in_fd,&file_type,1)!=1)  { kill_net(); return -1; }    
    if (file_type==NF_OPEN_LOCAL_FILE) 
    {
      uchar name_size;
      if (read(net_in_fd,&name_size,1)!=1)  { kill_net(); return -1; }          
      int size=read(net_in_fd,filename,name_size);
      if (size!=name_size)  { kill_net(); return -1; }    
      return -2;
    }
    else if (file_type==NF_OPEN_FAILED) return -1;

    int fd;
    if (read(net_in_fd,&fd,sizeof(fd))!=sizeof(fd))  { kill_net(); return -1; }

    return fd;
  } else return -2;          // return open local
}

long NF_close(int fd)
{
  if (net_installed)
  {
    char cm=NFCMD_CLOSE;
    if (write(net_out_fd,&cm,1)!=1) { kill_net(); return 0; }
    if (write(net_out_fd,&fd,sizeof(fd))!=sizeof(fd)) { kill_net(); return 0; }
    char stat;
    if (read(net_in_fd,&stat,sizeof(stat))!=sizeof(stat))  { kill_net(); return 0; }
    return stat;
  } else return 0;  
}


long NF_read(int fd, void *buf, long size)
{
  if (net_installed && size)
  {
    char cm=NFCMD_READ;

    if (write(net_out_fd,&cm,1)!=1) { kill_net(); return 0; }
    if (write(net_out_fd,&fd,sizeof(fd))!=sizeof(fd)) { kill_net(); return 0; }
    if (write(net_out_fd,&size,sizeof(size))!=sizeof(size)) { kill_net(); return 0; }

    long total_read=0;
    ushort t=0xffff;
    while (size && t>=READ_PACKET_SIZE-2)
    {
      if (read(net_in_fd,&t,sizeof(t))!=sizeof(t))  { kill_net(); return 0; }      
      if (read(net_in_fd,buf,t)!=t)  { kill_net(); return total_read; }

      total_read+=t;
      size-=t;
      buf=(void *)((char *)buf+t);


    }
    return total_read;
  } else return 0;  
}


long NF_filelength(int fd)
{
  if (net_installed)
  {
    char cm=NFCMD_SIZE;
    if (write(net_out_fd,&cm,1)!=1) { kill_net(); return 0; }
    if (write(net_out_fd,&fd,sizeof(fd))!=sizeof(fd)) { kill_net(); return 0; }
    long size;
    if (read(net_in_fd,&size,sizeof(size))!=sizeof(size))  { kill_net(); return 0; }
    return size;
  } else return 0;  
}

long NF_tell(int fd)
{
  if (net_installed)
  {
    char cm=NFCMD_TELL;
    if (write(net_out_fd,&cm,1)!=1) { kill_net(); return 0; }
    if (write(net_out_fd,&fd,sizeof(fd))!=sizeof(fd)) { kill_net(); return 0; }
    long offset;
    if (read(net_in_fd,&offset,sizeof(offset))!=sizeof(offset))  { kill_net(); return 0; }
    return offset;
  } else return 0;  
}

long NF_seek(int fd, long offset)
{
  if (net_installed)
  {
    char cm=NFCMD_SEEK;
    if (write(net_out_fd,&cm,1)!=1) { kill_net(); return 0; }
    if (write(net_out_fd,&fd,sizeof(fd))!=sizeof(fd)) { kill_net(); return 0; }
    if (write(net_out_fd,&offset,sizeof(offset))!=sizeof(offset)) { kill_net(); return 0; }

    long offset;
    if (read(net_in_fd,&offset,sizeof(offset))!=sizeof(offset))  { kill_net(); return 0; }
    return offset;
  } else return 0;  
}

static int aquire_mem_lock()
{
  if (base->mem_lock==0 || base->mem_lock==2)
  {
    base->mem_lock=2;
    if (base->mem_lock==2)
      return 1;
  }
//  next_process();   // probably just gonna loop until we get the lock so halt for next preocess
  return 0;
}

void service_net_request() 
{
  if (net_installed)
  {
    if (base->input_state==INPUT_NET_DEAD)
      kill_net();
    else
    {
      if (aquire_mem_lock())
      {
      if (base->calc_crcs)
      {      
        crc_man_write_crc_file(NET_CRC_FILENAME);       // return 0 on failure
        base->calc_crcs=0;
        base->mem_lock=0;

        uchar cmd=NFCMD_CRCS_CALCED;
        if (write(net_out_fd,&cmd,1)!=1) { kill_net(); return ; }
      } else base->mem_lock=0;
      }
      if (aquire_mem_lock())
      {
      if (base->get_lsf)
      {
        base->get_lsf=0;
        base->mem_lock=0;
        uchar c[2]={NFCMD_PROCESS_LSF,strlen(lsf)+1};
        if (write(net_out_fd,&c,2)!=2) { kill_net(); return ; }
        if (write(net_out_fd,lsf,c[1])!=c[1]) { kill_net(); return ; }
      } else base->mem_lock=0;
      }
    }
  }
}


int get_remote_lsf(char *name, char *filename)  // filename should be 256 bytes
{
  if (net_installed)
  {
    uchar cm[2]={NFCMD_REQUEST_LSF,strlen(name)+1};
    if (write(net_out_fd,cm,2)!=2) { kill_net(); return 0; }
    if (write(net_out_fd,name,cm[1])!=cm[1]) { kill_net(); return 0; }
    uchar size;
    if (read(net_in_fd,&size,1)!=1) { kill_net(); return 0; }
    if (size==0) return 0;
    if (read(net_in_fd,filename,size)!=size) { kill_net(); return 0; }
    return 1;  
  } else return 0;
}

int request_server_entry()
{
  if (net_installed)
  {
    if (!net_server) return 0;
    uchar cm[2]={NFCMD_REQUEST_ENTRY,strlen(net_server)+1};
    if (write(net_out_fd,cm,2)!=2) { kill_net(); return 0; }
    if (write(net_out_fd,net_server,cm[1])!=cm[1]) { kill_net(); return 0; }
    ushort cnum;  // client number
    if (read(net_in_fd,&cnum,2)!=2) { kill_net(); return 0; } 
    if (cnum==0) return 0;
    local_client_number=cnum;
    return 1;
  } else return 0;
}


int reload_start()
{
  if (net_installed)
  {
    uchar cmd=NFCMD_RELOAD_START;
    if (write(net_out_fd,&cmd,1)!=1) { kill_net(); return 0; } 
    if (read(net_in_fd,&cmd,1)!=1) { kill_net(); return 0; } 
    return cmd;
  } else return 1;
}


int reload_end()
{
  if (net_installed)
  {
    uchar cmd=NFCMD_RELOAD_END;
    if (write(net_out_fd,&cmd,1)!=1) { kill_net(); return 0; } 
    if (read(net_in_fd,&cmd,1)!=1) { kill_net(); return 0; } 
    return cmd;
  } else return 1;
}

void net_reload()
{
  if (net_installed)
  {
    if (net_server)
    {
      if (current_level)
        delete current_level;
      bFILE *fp;

      if (!reload_start()) return ;

      do {            // make sure server saves the file
      fp=open_file(NET_STARTFILE,"rb");
      if (fp->open_failure()) { delete fp; fp=NULL; }
      } while (!fp);

      spec_directory sd(fp);  

      spec_entry *e=sd.find("Copyright 1995 Crack dot Com, All Rights reserved"); 
      if (!e)
      { 
      the_game->show_help("This level is missing copyright information, cannot load\n");
      current_level=new level(100,100,"untitled");
      the_game->need_refresh();
      }
      else 
        current_level=new level(&sd,fp,NET_STARTFILE);

      delete fp;     
      base->current_tick=(current_level->tick_counter()&0xff); 

      reload_end();
    } else if (current_level)
    {
      
      join_struct *join_list=shm2real(join_struct,base->join_list);

      while (!aquire_mem_lock())
      {
      next_process();
      service_net_request();
      }

      while (join_list)
      {
      
      view *f=player_list;
      for (;f && f->next;f=f->next);      // find last player, add one for pn
      int i,st=0;
      for (i=0;i<total_objects;i++)
      if (!strcmp(object_names[i],"START"))
      st=i;

      game_object *o=create(current_start_type,0,0);
      game_object *start=current_level->get_random_start(320,NULL);
      if (start) { o->x=start->x; o->y=start->y; }
      else { o->x=100; o->y=100; }

      f->next=new view(o,NULL,shm2real(join_struct,base->join_list)->client_id);
      strcpy(f->next->name,shm2real(join_struct,base->join_list)->name);
      o->set_controller(f->next);

      if (start)
      current_level->add_object_after(o,start);
      else
      current_level->add_object(o);

      view *v=f->next;      

      v->cx1=5;
      v->cy1=5;
      v->cx2=319-5;
      v->cy2=199-5;
      join_list=shm2real(join_struct,join_list->next);
      }     
      base->join_list=NULL;
      current_level->save(NET_STARTFILE,1);
      base->mem_lock=0;


      jwindow *j=eh->new_window(0,yres/2,-1,-1,new info_field(WINDOW_FRAME_LEFT,
                                                   WINDOW_FRAME_TOP,
                                                   0,"Clients are re-syncing, please wait...",NULL));
      eh->flush_screen();
      if (!reload_start()) return ;

      // wait for all client to reload the level with the new players
      do  
      { 
      next_process();
      } while (!reload_end());
      eh->close_window(j);

    }      
  }
}

int client_number() { return local_client_number; }


void send_local_request()
{
  if (net_installed)
  {
    if (base->join_list)
      base->packet.write_byte(SCMD_RELOAD);

    uchar cmd=NFCMD_SEND_INPUT;

    if (write(net_out_fd,&cmd,1)!=1) { kill_net(); return ; }    
    if (read(net_in_fd,&cmd,1)!=1) { kill_net(); return ; }    
    if (write(net_out_fd,&cmd,1)!=1) { kill_net(); return ; }    
  } else base->input_state=INPUT_PROCESSING;
}

void kill_slackers()
{
  if (net_installed)
  {
    uchar cmd=NFCMD_KILL_SLACKERS;
    if (write(net_out_fd,&cmd,1)!=1) { kill_net(); return ; }    
    if (read(net_in_fd,&cmd,1)!=1) { kill_net(); return ; }        
  }
}

int get_inputs_from_server(unsigned char *buf)
{
  if (net_installed && base->input_state!=INPUT_PROCESSING)      // if input is not here, wait on it
  {
    timeval start;
    gettimeofday(&start,NULL);

    int total_retry=0;
    jwindow *abort=NULL;
    linked_list input;
    while (base->input_state!=INPUT_PROCESSING)
    { 
      if (!net_installed)  
      { 
      base->input_state=INPUT_PROCESSING; 
      return 1; 
      }
      server_check();
      service_net_request();

      timeval now;                   // if this is taking to long, the packet was probably lost, ask for it to be resent
      gettimeofday(&now,NULL);
      if ((((now.tv_sec-start.tv_sec)*100)+(now.tv_usec-start.tv_usec)/10000)>20)
      {
//    fprintf(stderr,"receive timeout %d\n",(((now.tv_sec-start.tv_sec)*100)+(now.tv_usec-start.tv_usec)/10000));
      uchar cmd=NFCMD_INPUT_MISSING;
      if (write(net_out_fd,&cmd,1)!=1) { kill_net(); return  0; }    
      if (read(net_in_fd,&cmd,1)!=1) { kill_net(); return 0; }     // block, so net driver can request input
      gettimeofday(&start,NULL);
      total_retry++;
      if (total_retry==10)    // 2 seconds and nothing
      {
        abort=eh->new_window(0,yres/2,-1,eh->font()->height()*4,
                         new info_field(WINDOW_FRAME_LEFT,
                                    WINDOW_FRAME_TOP,
                                    0,"Waiting for data...",
                                    new button(WINDOW_FRAME_LEFT,
                                           WINDOW_FRAME_TOP+eh->font()->height()+5,ID_NET_DISCONNECT,
                                           "Disconnect slackers",NULL)),"Error");     
        eh->flush_screen();
      }
      }
      if (abort)
      {
      if (eh->event_waiting())
      {
        event ev;
        do
        {
          eh->get_event(ev);
          if (ev.type==EV_MESSAGE && ev.message.id==ID_NET_DISCONNECT)
          kill_slackers();
          else if (ev.type!=EV_MOUSE_MOVE)  // no need to save mouse move events (likely to be a lot)
          {
            event *e=new event;
            *e=ev;
            input.add_front(e);
          } 
        } while (eh->event_waiting());

        eh->flush_screen();
      }
      }
    }

    if (abort)
    {
      eh->close_window(abort);
      while (input.first())               // push all the key events
      {
      event *ev=(event *)input.first();
      input.unlink((linked_node *)ev);
      eh->push_event(ev);
      }
    }
  }

//  while (!aquire_mem_lock()) service_net_request();

  memcpy(base->last_packet.data,base->packet.data,base->packet.packet_size()+base->packet.packet_prefix_size());
  
  int size=base->packet.packet_size();
  memcpy(buf,base->packet.packet_data(),size);

  base->packet.packet_reset();
  base->mem_lock=0;

  return size;
}


void server_check()       // read a byte from the net driver, causing the OS to give up the rest of our time-slice
{
  if (net_installed)
  {
    if (base->input_state==INPUT_NET_DEAD)
    { close(net_out_fd); close(net_in_fd); net_installed=0; kill_net(); }
    else
    {
      uchar cmd=NFCMD_BLOCK;
      if (write(net_out_fd,&cmd,1)!=1) { kill_net(); return ; }    
      if (base->input_state==INPUT_NET_DEAD)
      { close(net_out_fd); close(net_in_fd); net_installed=0; kill_net(); }
      else
      {
      if (read(net_in_fd,&cmd,1)!=1) { kill_net(); return ; }  
      if (base->input_state==INPUT_NET_DEAD)
      { close(net_out_fd); close(net_in_fd); net_installed=0; kill_net(); }
      else
        if (write(net_out_fd,&cmd,1)!=1) { kill_net(); return ; }
      }
    }
  }
}

int become_server()
{
  if (net_installed)
  {
    uchar cmd=NFCMD_BECOME_SERVER;
    if (write(net_out_fd,&cmd,1)!=1) { kill_net(); return 0; } 
    if (read(net_in_fd,&cmd,1)!=1) { kill_net(); return 0; }     
    
    return 1;
  }
  return 0;
}

void read_new_views() { ; }



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