1/* Serial interface for raw TCP connections on Un*x like systems
2   Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001
3   Free Software Foundation, Inc.
4
5   This file is part of GDB.
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 2 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program; if not, write to the Free Software
19   Foundation, Inc., 59 Temple Place - Suite 330,
20   Boston, MA 02111-1307, USA.  */
21
22#include "defs.h"
23#include "serial.h"
24#include "ser-unix.h"
25
26#include <sys/types.h>
27
28#ifdef HAVE_SYS_FILIO_H
29#include <sys/filio.h>  /* For FIONBIO. */
30#endif
31#ifdef HAVE_SYS_IOCTL_H
32#include <sys/ioctl.h>  /* For FIONBIO. */
33#endif
34
35#include <sys/time.h>
36#include <netinet/in.h>
37#include <arpa/inet.h>
38#include <netdb.h>
39#include <sys/socket.h>
40#include <netinet/tcp.h>
41
42#include <signal.h>
43#include "gdb_string.h"
44
45static int net_open (struct serial *scb, const char *name);
46static void net_close (struct serial *scb);
47void _initialize_ser_tcp (void);
48
49/* seconds to wait for connect */
50#define TIMEOUT 15
51/* how many times per second to poll deprecated_ui_loop_hook */
52#define POLL_INTERVAL 2
53
54/* Open a tcp socket */
55
56static int
57net_open (struct serial *scb, const char *name)
58{
59  char *port_str, hostname[100];
60  int n, port, tmp;
61  int use_udp;
62  struct hostent *hostent;
63  struct sockaddr_in sockaddr;
64
65  use_udp = 0;
66  if (strncmp (name, "udp:", 4) == 0)
67    {
68      use_udp = 1;
69      name = name + 4;
70    }
71  else if (strncmp (name, "tcp:", 4) == 0)
72    name = name + 4;
73
74  port_str = strchr (name, ':');
75
76  if (!port_str)
77    error ("net_open: No colon in host name!");	   /* Shouldn't ever happen */
78
79  tmp = min (port_str - name, (int) sizeof hostname - 1);
80  strncpy (hostname, name, tmp);	/* Don't want colon */
81  hostname[tmp] = '\000';	/* Tie off host name */
82  port = atoi (port_str + 1);
83
84  /* default hostname is localhost */
85  if (!hostname[0])
86    strcpy (hostname, "localhost");
87
88  hostent = gethostbyname (hostname);
89  if (!hostent)
90    {
91      fprintf_unfiltered (gdb_stderr, "%s: unknown host\n", hostname);
92      errno = ENOENT;
93      return -1;
94    }
95
96  if (use_udp)
97    scb->fd = socket (AF_INET, SOCK_DGRAM, 0);
98  else
99    scb->fd = socket (AF_INET, SOCK_STREAM, 0);
100
101  if (scb->fd < 0)
102    return -1;
103
104  sockaddr.sin_family = AF_INET;
105  sockaddr.sin_port = htons (port);
106  memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
107	  sizeof (struct in_addr));
108
109  /* set socket nonblocking */
110  tmp = 1;
111  ioctl (scb->fd, FIONBIO, &tmp);
112
113  /* Use Non-blocking connect.  connect() will return 0 if connected already. */
114  n = connect (scb->fd, (struct sockaddr *) &sockaddr, sizeof (sockaddr));
115
116  if (n < 0 && errno != EINPROGRESS)
117    {
118      net_close (scb);
119      return -1;
120    }
121
122  if (n)
123    {
124      /* looks like we need to wait for the connect */
125      struct timeval t;
126      fd_set rset, wset;
127      int polls = 0;
128      FD_ZERO (&rset);
129
130      do
131	{
132	  /* While we wait for the connect to complete
133	     poll the UI so it can update or the user can
134	     interrupt. */
135	  if (deprecated_ui_loop_hook)
136	    {
137	      if (deprecated_ui_loop_hook (0))
138		{
139		  errno = EINTR;
140		  net_close (scb);
141		  return -1;
142		}
143	    }
144
145	  FD_SET (scb->fd, &rset);
146	  wset = rset;
147	  t.tv_sec = 0;
148	  t.tv_usec = 1000000 / POLL_INTERVAL;
149
150	  n = select (scb->fd + 1, &rset, &wset, NULL, &t);
151	  polls++;
152	}
153      while (n == 0 && polls <= TIMEOUT * POLL_INTERVAL);
154      if (n < 0 || polls > TIMEOUT * POLL_INTERVAL)
155	{
156	  if (polls > TIMEOUT * POLL_INTERVAL)
157	    errno = ETIMEDOUT;
158	  net_close (scb);
159	  return -1;
160	}
161    }
162
163  /* Got something.  Is it an error? */
164  {
165    int res, err, len;
166    len = sizeof(err);
167    res = getsockopt (scb->fd, SOL_SOCKET, SO_ERROR, &err, &len);
168    if (res < 0 || err)
169      {
170	if (err)
171	  errno = err;
172	net_close (scb);
173	return -1;
174      }
175  }
176
177  /* turn off nonblocking */
178  tmp = 0;
179  ioctl (scb->fd, FIONBIO, &tmp);
180
181#if (!defined(__BEOS__) && !defined(__HAIKU__))
182  if (use_udp == 0)
183    {
184      /* Disable Nagle algorithm. Needed in some cases. */
185      tmp = 1;
186      setsockopt (scb->fd, IPPROTO_TCP, TCP_NODELAY,
187		  (char *)&tmp, sizeof (tmp));
188    }
189#endif
190
191  /* If we don't do this, then GDB simply exits
192     when the remote side dies.  */
193  signal (SIGPIPE, SIG_IGN);
194
195  return 0;
196}
197
198static void
199net_close (struct serial *scb)
200{
201  if (scb->fd < 0)
202    return;
203
204  close (scb->fd);
205  scb->fd = -1;
206}
207
208void
209_initialize_ser_tcp (void)
210{
211  struct serial_ops *ops = XMALLOC (struct serial_ops);
212  memset (ops, 0, sizeof (struct serial_ops));
213  ops->name = "tcp";
214  ops->next = 0;
215  ops->open = net_open;
216  ops->close = net_close;
217  ops->readchar = ser_unix_readchar;
218  ops->write = ser_unix_write;
219  ops->flush_output = ser_unix_nop_flush_output;
220  ops->flush_input = ser_unix_flush_input;
221  ops->send_break = ser_unix_nop_send_break;
222  ops->go_raw = ser_unix_nop_raw;
223  ops->get_tty_state = ser_unix_nop_get_tty_state;
224  ops->set_tty_state = ser_unix_nop_set_tty_state;
225  ops->print_tty_state = ser_unix_nop_print_tty_state;
226  ops->noflush_set_tty_state = ser_unix_nop_noflush_set_tty_state;
227  ops->setbaudrate = ser_unix_nop_setbaudrate;
228  ops->setstopbits = ser_unix_nop_setstopbits;
229  ops->drain_output = ser_unix_nop_drain_output;
230  ops->async = ser_unix_async;
231  serial_add_interface (ops);
232}
233