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/* Serial interface for raw TCP connections on Un*x like systems.

   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2005, 2006,

   2007, 2008 Free Software Foundation, Inc.

   This file is part of GDB.

   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 3 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, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "serial.h"

#include "ser-base.h"

#include "ser-tcp.h"

#include <sys/types.h>

#ifdef HAVE_SYS_FILIO_H

#include <sys/filio.h>  /* For FIONBIO. */

#endif

#ifdef HAVE_SYS_IOCTL_H

#include <sys/ioctl.h>  /* For FIONBIO. */

#endif

#include <sys/time.h>

#ifdef USE_WIN32API

#include <winsock2.h>

#define ETIMEDOUT WSAETIMEDOUT

#define close(fd) closesocket (fd)

#define ioctl ioctlsocket

#else

#include <netinet/in.h>

#include <arpa/inet.h>

#include <netdb.h>

#include <sys/socket.h>

#include <netinet/tcp.h>

#endif

#include <signal.h>

#include "gdb_string.h"

#ifndef HAVE_SOCKLEN_T

typedef int socklen_t;

#endif

void _initialize_ser_tcp (void);

/* seconds to wait for connect */

#define TIMEOUT 15

/* how many times per second to poll deprecated_ui_loop_hook */

#define POLL_INTERVAL 2

/* Open a tcp socket */

int

net_open (struct serial *scb, const char *name)

{

  char *port_str, hostname[100];

  int n, port, tmp;

  int use_udp;

  struct hostent *hostent;

  struct sockaddr_in sockaddr;

#ifdef USE_WIN32API

  u_long ioarg;

#else

  int ioarg;

#endif

  use_udp = 0;

  if (strncmp (name, "udp:", 4) == 0)

    {

      use_udp = 1;

      name = name + 4;

    }

  else if (strncmp (name, "tcp:", 4) == 0)

    name = name + 4;

  port_str = strchr (name, ':');

  if (!port_str)

    error (_("net_open: No colon in host name!"));         /* Shouldn't ever happen */

  tmp = min (port_str - name, (int) sizeof hostname - 1);

  strncpy (hostname, name, tmp);        /* Don't want colon */

  hostname[tmp] = '\000';       /* Tie off host name */

  port = atoi (port_str + 1);

  /* default hostname is localhost */

  if (!hostname[0])

    strcpy (hostname, "localhost");

  hostent = gethostbyname (hostname);

  if (!hostent)

    {

      fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname);

      errno = ENOENT;

      return -1;

    }

  if (use_udp)

    scb->fd = socket (PF_INET, SOCK_DGRAM, 0);

  else

    scb->fd = socket (PF_INET, SOCK_STREAM, 0);

  if (scb->fd < 0)

    return -1;

  sockaddr.sin_family = PF_INET;

  sockaddr.sin_port = htons (port);

  memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,

          sizeof (struct in_addr));

  /* set socket nonblocking */

  ioarg = 1;

  ioctl (scb->fd, FIONBIO, &ioarg);

  /* Use Non-blocking connect.  connect() will return 0 if connected already. */

  n = connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr));

  if (n < 0

#ifdef USE_WIN32API

      /* Under Windows, calling "connect" with a non-blocking socket

         results in WSAEWOULDBLOCK, not WSAEINPROGRESS.  */

      && WSAGetLastError() != WSAEWOULDBLOCK

#else

      && errno != EINPROGRESS

#endif

      )

    {

#ifdef USE_WIN32API

      errno = WSAGetLastError();

#endif

      net_close (scb);

      return -1;

    }

  if (n)

    {

      /* looks like we need to wait for the connect */

      struct timeval t;

      fd_set rset, wset, eset;

      int polls = 0;

      FD_ZERO (&rset);

      do

        {

          /* While we wait for the connect to complete,

             poll the UI so it can update or the user can

             interrupt.  */

          if (deprecated_ui_loop_hook)

            {

              if (deprecated_ui_loop_hook (0))

                {

                  errno = EINTR;

                  net_close (scb);

                  return -1;

                }

            }

          FD_SET (scb->fd, &rset);

          wset = rset;

          eset = rset;

          t.tv_sec = 0;

          t.tv_usec = 1000000 / POLL_INTERVAL;

          /* POSIX systems return connection success or failure by signalling

             wset.  Windows systems return success in wset and failure in

             eset.

             We must call select here, rather than gdb_select, because

             the serial structure has not yet been initialized - the

             MinGW select wrapper will not know that this FD refers

             to a socket.  */

          n = select (scb->fd + 1, &rset, &wset, &eset, &t);

          polls++;

        }

      while (n == 0 && polls <= TIMEOUT * POLL_INTERVAL);

      if (n < 0 || polls > TIMEOUT * POLL_INTERVAL)

        {

          if (polls > TIMEOUT * POLL_INTERVAL)

            errno = ETIMEDOUT;

          net_close (scb);

          return -1;

        }

    }

  /* Got something.  Is it an error? */

  {

    int res, err;

    socklen_t len;

    len = sizeof (err);

    /* On Windows, the fourth parameter to getsockopt is a "char *";

       on UNIX systems it is generally "void *".  The cast to "void *"

       is OK everywhere, since in C "void *" can be implicitly

       converted to any pointer type.  */

    res = getsockopt (scb->fd, SOL_SOCKET, SO_ERROR, (void *) &err, &len);

    if (res < 0 || err)

      {

        if (err)

          errno = err;

        net_close (scb);

        return -1;

      }

  }

  /* turn off nonblocking */

  ioarg = 0;

  ioctl (scb->fd, FIONBIO, &ioarg);

  if (use_udp == 0)

    {

      /* Disable Nagle algorithm. Needed in some cases. */

      tmp = 1;

      setsockopt (scb->fd, IPPROTO_TCP, TCP_NODELAY,

                  (char *)&tmp, sizeof (tmp));

    }

#ifdef SIGPIPE

  /* If we don't do this, then GDB simply exits

     when the remote side dies.  */

  signal (SIGPIPE, SIG_IGN);

#endif

  return 0;

}

void

net_close (struct serial *scb)

{

  if (scb->fd < 0)

    return;

  close (scb->fd);

  scb->fd = -1;

}

int

net_read_prim (struct serial *scb, size_t count)

{

  return recv (scb->fd, scb->buf, count, 0);

}

int

net_write_prim (struct serial *scb, const void *buf, size_t count)

{

  return send (scb->fd, buf, count, 0);

}

void

_initialize_ser_tcp (void)

{

#ifdef USE_WIN32API

  /* Do nothing; the TCP serial operations will be initialized in

     ser-mingw.c.  */

  return;

#else

  struct serial_ops *ops;

  ops = XMALLOC (struct serial_ops);

  memset (ops, 0, sizeof (struct serial_ops));

  ops->name = "tcp";

  ops->next = 0;

  ops->open = net_open;

  ops->close = net_close;

  ops->readchar = ser_base_readchar;

  ops->write = ser_base_write;

  ops->flush_output = ser_base_flush_output;

  ops->flush_input = ser_base_flush_input;

  ops->send_break = ser_base_send_break;

  ops->go_raw = ser_base_raw;

  ops->get_tty_state = ser_base_get_tty_state;

  ops->set_tty_state = ser_base_set_tty_state;

  ops->print_tty_state = ser_base_print_tty_state;

  ops->noflush_set_tty_state = ser_base_noflush_set_tty_state;

  ops->setbaudrate = ser_base_setbaudrate;

  ops->setstopbits = ser_base_setstopbits;

  ops->drain_output = ser_base_drain_output;

  ops->async = ser_base_async;

  ops->read_prim = net_read_prim;

  ops->write_prim = net_write_prim;

  serial_add_interface (ops);

#endif /* USE_WIN32API */

}