File: XSocket.cc

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/*
XSocket.cc
*/

#include "XSocket.h"

struct sigaction actx, oldactx;

XSocket::XSocket ()
  {
  wsock = INVALID_SOCKET;
  }
 
XSocket::XSocket (int awsock)
  {
  wsock = awsock;
  }
 
XSocket::~XSocket ()
  {
  }

int XSocket::getSock (void)
  {
  return wsock;
  }

void XSocket::SetSock (int sock)
  {
  wsock = sock;
  fsock = fdopen (wsock, "r+");
  }

void XSocket::Close ()
  {
  if (wsock != INVALID_SOCKET)
    {
    shutdown (wsock, 2);
    close    (wsock);
    wsock = INVALID_SOCKET;
    }
  }

/*
IF IS POSSIBLE, DO NOT USE. ADD 4 kb OF MEM FOR THE fgets
bool XSocket::Gets (char buf[], int  nbytes)
  {
  if (fgets (buf, nbytes, fsock) == NULL) return false; 
  else 
    {
    QuitaRetornoCarroDeLinea (buf);
    buf[strlen(buf)] = '\0';
    return true;
    }
  }
*/

bool XSocket::Gets (char buf[], int  nbytes)
  {
  int ret, i = 0;
  buf[0] = '\0';
  for(;;) 
    {
    if ((ret = read(wsock, &buf[i], 1) <= 0)) 
      {
      if ((ret == ERROR_SOCKET) && (errno == EINTR)) continue;
      return false;
      }
    if (buf[i] == '\r') continue;
    if (buf[i] == '\n') 
      {
      buf[i] = '\0';
      QuitaRetornoCarroDeLinea (buf);
      return true;
      }
    if (++i == nbytes) 
      {
      buf[nbytes] = '\0';
      QuitaRetornoCarroDeLinea (buf);
      return true;
      }
    }     
  }

void xsprocsignals (int signal_type)
  {
  switch (signal_type)
    {
    /* TIMEOUT. Alarm signal. */     
    case SIGALRM:              
      sigaction (SIGALRM, &oldactx, NULL);
      break;
    }
  }

/* Open a TCP connection. Return socket descriptor if OK, else ERROR_SOCKET on error*/
int XSocket::do_client_inet (char *host, char *service, int port, int timeout)
   /*
   char *host;    name or dotted-decimal addr of other system 
   char *service; name of service being requested, can be NULL, if port > 0 
   int  port;     if == 0, nothing special - use port# of service 
                  if < 0, bind a local reserved port 
                  if > 0, it's the port# of server (host-byte-order)
   */
  {
  struct sockaddr_in      srv_addr;
  xulong           inaddr;
  struct servent         *sp;
  struct hostent         *hp;
  int                     fd, res;

  /*Initialize the server's Internet address structure.
     We'll store the actual 4-byte Internet address and the
     2-byte port# below */

  memset((char *) &srv_addr, 0, sizeof(srv_addr));
  srv_addr.sin_family = AF_INET;

  if (service != NULL) 
    {
    if ((sp = getservbyname(service, "tcp")) == NULL) return(ERROR_SOCKET);
    if (port > 0) srv_addr.sin_port = htons(port);
    else srv_addr.sin_port = sp->s_port;
    } 
  else 
    {
    if (port <= 0) return(ERROR_SOCKET);
    srv_addr.sin_port = htons(port);
    }

  /*Try to convert the host name as a dotted-decimal number. If fails do we call gethostbyname().*/

  if ((inaddr = inet_addr(host)) != INADDR_BROADCAST) 
    {
    /* it's dotted-decimal */
    bcopy((char *) &inaddr, (char *) &srv_addr.sin_addr, sizeof(inaddr));
    } 
  else 
    {
    if ((hp = gethostbyname(host)) == NULL) return(ERROR_SOCKET);
    bcopy(hp->h_addr, (char *) &srv_addr.sin_addr, hp->h_length);
    }
  if (port >= 0) 
    {
    if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) return(ERROR_SOCKET);
    } 
  else if (port < 0) return(ERROR_SOCKET);

  sigemptyset(&actx.sa_mask); actx.sa_flags = 0; actx.sa_handler = xsprocsignals;
  sigaction (SIGALRM, &actx, &oldactx);      
  alarm (timeout);  
  res = connect(fd, (struct sockaddr *) &srv_addr, sizeof(srv_addr));
  sigaction (SIGALRM, &oldactx, NULL);
  
  if (res < 0) 
    {
    close(fd);
    return(ERROR_SOCKET);
    }
  return(fd); /* all OK */
  }
  
int XSocket::do_client_unix (char *filesocket)
  {
  struct sockaddr_un srv_addr;
  int sock;
  sock = socket(AF_UNIX, SOCK_STREAM, 0);
  if (sock < 0) {perror("socket"); return(ERROR_SOCKET);}
  srv_addr.sun_family = AF_UNIX;
  strncpy(srv_addr.sun_path, filesocket, sizeof(srv_addr.sun_path)-1);
  srv_addr.sun_path[sizeof(srv_addr.sun_path)-1] = '\0';
    
  if (connect (sock, (sockaddr *)&srv_addr, sizeof(srv_addr)) < 0) 
    {
    perror ("connect"); 
    perror (filesocket);
    return (ERROR_SOCKET);
    }
  return (sock);
  }  

int XSocket::Puts (const char *buf)
  {
  return (Write(buf, strlen(buf)));
  }

/* Return:
 *              val > 0         -> data available
 *              val == 0        -> no data available
 *              val == -1       -> error
 */
int XSocket::Read (char *buf, int nbytes)
  {
  int n;

  if ((n = read(wsock, buf, nbytes)) > 0)
    {
    return(n);
    }
  if ((n == ERROR_SOCKET) && (errno == EWOULDBLOCK))
    {
    return(0);
    }
  return(ERROR_SOCKET);
  }

int XSocket::Write (const char *buf, int nbytes)
  {
  int nleft, nwritten;
  nleft = nbytes;
  while(nleft > 0) 
    {
    if ((nwritten = write(wsock, buf, nleft)) == -1) 
      {
      if (errno == EWOULDBLOCK) continue;
      //Another error can be SIGPIPE (EPIPE, 32)
      else if (errno == EPIPE) return (ERROR_SOCKET_PIPE); 
      return(ERROR_SOCKET);
      }
    nleft -= nwritten;
    buf += nwritten;
    }
  return(nbytes);
  }

char *XSocket::Client_name (void)
  {
  socklen_t len;
  struct sockaddr_in sin;
  struct hostent *host, hostent;

  len = sizeof (sin);
  if (getpeername (wsock, (struct sockaddr *) &sin, &len) < 0)
    {
    return "";
    }
  else 
    {
    if ((host = gethostbyaddr ((char *) &sin.sin_addr, sizeof (struct in_addr), AF_INET)) == 0) 
      {
      host = &hostent;
      host->h_name = inet_ntoa (sin.sin_addr);
      return host->h_name;
      }
    else 
      {
      return host->h_name;
      }
    }
  }

/* Take a service name, and a service type, and return a port number.  If the
   service name is not found, it tries it as a decimal number.  The number
   returned is byte ordered for the network. */
int XSocket::atoport (char *service, char *proto)
  {
  int port;
  long int lport;
  struct servent *serv;
  char *errpos;

  serv = getservbyname(service, proto);
  if (serv != NULL) port = serv->s_port;
  else 
    {
    lport = strtol(service,&errpos,0);
    if ((errpos[0] != 0) || (lport < 1) || (lport > 65535)) {return ERROR_SOCKET;}
    port = htons((int)lport);
    }
  return port;
  }

/* This ignores the SIGPIPE signal.  This is usually a good idea, since
   the default behaviour is to terminate the application.  SIGPIPE is
   sent when you try to write to an unconnected socket.  You should
   check your return codes to make sure you catch this error! */
void XSocket::ignore_pipe(void)
  {
  struct sigaction sig;
  sig.sa_handler = SIG_IGN;
  sig.sa_flags = 0;
  sigemptyset(&sig.sa_mask);
  sigaction(SIGPIPE,&sig,NULL);
  }

/* This function listens on a port, and returns connections.  It forks
   returns off internally, so your main function doesn't have to worry
   about that.  This can be confusing if you don't know what is going on.
   The function will create a new process for every incoming connection,
   so in the listening process, it will never return.  Only when a connection
   comes in, and we create a new process for it will the function return.
   This means that your code that calls it should _not_ loop.

   The parameters are as follows:
     socket_type: SOCK_STREAM or SOCK_DGRAM (TCP or UDP sockets)
     port: The port to listen on.  Remember that ports < 1024 are
       reserved for the root user.  Must be passed in network byte
       order (see "man htons").
     listener: This is a pointer to a variable for holding the file
       descriptor of the socket which is being used to listen.  It
       is provided so that you can write a signal handler to close
       it in the event of program termination.  If you aren't interested,
       just pass NULL.  Note that all modern unixes will close file
       descriptors for you on exit, so this is not required. */
int XSocket::do_server_inet (int socket_type, u_short port, int *listener)
  {
  struct sockaddr_in address_inet;
  int listening_socket;
  int connected_socket = ERROR_SOCKET;
  int new_process;
  int reuse_addr = 1, res;

  /* Setup internet address information.This is used with the bind() call */
  memset((char *) &address_inet, 0, sizeof(address_inet));
  address_inet.sin_family = AF_INET;
  address_inet.sin_port = port;
  address_inet.sin_addr.s_addr = htonl(INADDR_ANY);    

  listening_socket = socket(AF_INET, socket_type, 0);
  if (listening_socket < 0) 
    {
    perror("socket");
    exit(EXIT_FAILURE);
    }

  if (listener != NULL) *listener = listening_socket;
  setsockopt(listening_socket, SOL_SOCKET, SO_REUSEADDR, &reuse_addr, sizeof(reuse_addr));
  
  res = bind(listening_socket, (struct sockaddr *) &address_inet, sizeof(address_inet));
    
  if (res < 0) 
    {
    perror("bind");
    close(listening_socket);
    exit(EXIT_FAILURE);
    }

  if (socket_type == SOCK_STREAM) 
    {
    listen(listening_socket, 5); /*Queue up to five connections before having them automatically rejected. */
    while(connected_socket < 0) 
      {
      connected_socket = accept(listening_socket, NULL, NULL);
      if (connected_socket < 0) 
        {
        /* Either a real error occured, or blocking was interrupted for
           some reason.  Only abort execution if a real error occured. */
        if (errno != EINTR) 
          {
          perror("accept");
          close(listening_socket);
          exit(EXIT_FAILURE);
          } 
        else 
          {
          continue;    /* don't fork - do the accept again */
          }
        }
      new_process = fork();
      if (new_process < 0) 
        {
        perror("fork");
        close(connected_socket);
        connected_socket = ERROR_SOCKET;
        }
      else 
        { /* We have a new process... */
        if (new_process == 0) 
          {
          /* This is the new process. */
          close(listening_socket); /* Close our copy of this socket */
          if (listener != NULL) *listener = -1; /* Closed in this process.  We are not responsible for it. */
          }
        else 
          {
          /* This is the main loop.Close copy of connected socket, and continue loop. */
          close(connected_socket);
          connected_socket = ERROR_SOCKET;
          }
        }
      }
    return connected_socket;
    }
  else
    {
    return listening_socket;
    }
  }

int XSocket::do_server_unix (int socket_type, int *listener)    
  {
  struct sockaddr_un address_unix;
  int listening_socket;
  int connected_socket = ERROR_SOCKET;
  int new_process;
  int reuse_addr = 1, res, socketsize;
  char fn[300];
  TBuffer tmpbuf;

  listening_socket = socket(AF_UNIX, socket_type, 0);
  if (listening_socket < 0) 
    {
    perror("socket");
    exit(EXIT_FAILURE);
    }
    
  if (listener != NULL) *listener = listening_socket;
  setsockopt(listening_socket, SOL_SOCKET, SO_REUSEADDR, &reuse_addr, sizeof(reuse_addr));    

  socketsize = SOCKETSIZE;
  setsockopt(listening_socket, SOL_SOCKET, SO_RCVBUF, &socketsize, sizeof(socketsize));
  setsockopt(listening_socket, SOL_SOCKET, SO_SNDBUF, &socketsize, sizeof(socketsize));

  strncpy (fn, make_root_socket(tmpbuf), 300 - 1);
  fn[300 - 1] = '\0';
  //if (FileExists (fn) == true) DeleteFile (fn);
  DeleteFile (fn);

  address_unix.sun_family = AF_UNIX;
  strncpy(address_unix.sun_path, fn, sizeof(address_unix.sun_path)-1);
  address_unix.sun_path[sizeof(address_unix.sun_path)-1] = '\0';
        
  res = bind(listening_socket, (sockaddr *)&address_unix, sizeof(address_unix));
  if (res < 0) {perror("bind"); close(listening_socket); exit(EXIT_FAILURE);}

  chmod (fn, S_IWOTH | S_IWGRP | S_IWUSR);
  if (socket_type == SOCK_STREAM) 
    {
    listen(listening_socket, 5); /*Queue up to five connections before having them automatically rejected. */
    while(connected_socket < 0) 
      {
      connected_socket = accept(listening_socket, NULL, NULL);
      if (connected_socket < 0) 
        {
        /* Either a real error occured, or blocking was interrupted for some reason.  Only abort execution if a real error occured. */
        if (errno != EINTR) 
          {
          perror("accept");
          close(listening_socket);
          return (ERROR_SOCKET);
          } 
        else 
          {
          continue;    /* don't fork - do the accept again */
          }
        }
      new_process = fork();
      if (new_process < 0) 
        {
        perror("fork");
        close(connected_socket);
        connected_socket = ERROR_SOCKET;
        }
      else 
        { /* We have a new process... */
        if (new_process == 0) 
          {
          /* This is the new process. */
          close(listening_socket); /* Close our copy of this socket */
          if (listener != NULL) *listener = -1; /* Closed in this process.  We are not responsible for it. */
          }
        else 
          {
          /* This is the main loop.Close copy of connected socket, and continue loop. */
          close(connected_socket);
          connected_socket = ERROR_SOCKET;
          }
        }
      }
    return connected_socket;
    }
  else
    {
    return listening_socket;
    }
  }

void XSocket::do_server_unix_only_bind (int socket_type, int *listener, char *fn)
  {
  struct sockaddr_un address_unix;
  int listening_socket;
  int reuse_addr = 1, res, socketsize;

  listening_socket = socket(AF_UNIX, socket_type, 0);
  if (listening_socket < 0) {perror("socket"); exit(EXIT_FAILURE);}
    
  if (listener != NULL) *listener = listening_socket;
  setsockopt(listening_socket, SOL_SOCKET, SO_REUSEADDR, &reuse_addr, sizeof(reuse_addr));    

  socketsize = SOCKETSIZE;
  setsockopt(listening_socket, SOL_SOCKET, SO_RCVBUF, &socketsize, sizeof(socketsize));
  setsockopt(listening_socket, SOL_SOCKET, SO_SNDBUF, &socketsize, sizeof(socketsize));

  if (FileExists (fn) == true) DeleteFile (fn);
  
  address_unix.sun_family = AF_UNIX;
  strncpy(address_unix.sun_path, fn, sizeof(address_unix.sun_path)-1);
  address_unix.sun_path[sizeof(address_unix.sun_path)-1] = '\0';
        
  res = bind(listening_socket, (sockaddr *)&address_unix, sizeof(address_unix));
  if (res < 0) {perror("bind"); close(listening_socket); exit(EXIT_FAILURE);}

  chmod (fn, S_IWOTH | S_IWGRP | S_IWUSR);

  if (socket_type == SOCK_STREAM) {listen(listening_socket, 5);}
  }
  

int XSocket::Send_TO (const char* buf, int TimeoutSeconds)
  {
  int BytesSent; 
  fd_set fd; 
  struct timeval tv; 

  FD_ZERO (&fd); 
  FD_SET (wsock, &fd); // adds sock to the file descriptor set 

  tv.tv_sec = TimeoutSeconds; 
  tv.tv_usec = 0; 
  
  if (0 == wsock) {return (0);} // Allready closed 

  // The return value is smaller than 'Size' when the Client breakes the operation down. 
  if (select (wsock + 1, NULL, &fd, NULL, &tv) == 0) 
    { 
    //UpdateSocket (Socket); 
    //Socket->m_LastFunction = "Send Timeout"; 
    return (0); 
    } 

  BytesSent = send (wsock, (char *) buf, strlen(buf), 0); 
  if (BytesSent == -1) 
    { 
    BytesSent = 0; 
    //UpdateSocket (Socket); 
    } 
  //Socket->m_LastFunction = "Send"; 
  return (BytesSent);   
  }