[deliverable/binutils-gdb.git] / gdb / ser-tcp.c

/* Serial interface for raw TCP connections on Un*x like systems
   Copyright 1992, 1993 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 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include "serial.h"
#include <sys/types.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#include "signals.h"

struct tcp_ttystate
{
  int bogus;
};

static int tcp_open PARAMS ((serial_t scb, const char *name));
static void tcp_raw PARAMS ((serial_t scb));
static int wait_for PARAMS ((serial_t scb, int timeout));
static int tcp_readchar PARAMS ((serial_t scb, int timeout));
static int tcp_setbaudrate PARAMS ((serial_t scb, int rate));
static int tcp_write PARAMS ((serial_t scb, const char *str, int len));
static void tcp_restore PARAMS ((serial_t scb));
static void tcp_close PARAMS ((serial_t scb));
static serial_ttystate tcp_get_tty_state PARAMS ((serial_t scb));
static int tcp_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));

/* Open up a raw tcp socket */

static int
tcp_open(scb, name)
     serial_t scb;
     const char *name;
{
  char *port_str;
  int port;
  struct hostent *hostent;
  struct sockaddr_in sockaddr;
  int tmp;
  char hostname[100];
  struct protoent *protoent;

  port_str = strchr (name, ':');

  if (!port_str)
    error ("tcp_open: No colon in host name!"); /* Shouldn't ever happen */

  tmp = min (port_str - name, sizeof hostname - 1);
  strncpy (hostname, name, tmp); /* Don't want colon */
  hostname[tmp] = '\000';	/* Tie off host name */
  port = atoi (port_str + 1);

  hostent = gethostbyname (hostname);

  if (!hostent)
    {
      fprintf (stderr, "%s: unknown host\n", hostname);
      errno = ENOENT;
      return -1;
    }

  scb->fd = socket (PF_INET, SOCK_STREAM, 0);
  if (scb->fd < 0)
    return -1;

  /* Allow rapid reuse of this port. */
  tmp = 1;
  setsockopt (scb->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&tmp, sizeof(tmp));

  /* Enable TCP keep alive process. */
  tmp = 1;
  setsockopt (scb->fd, SOL_SOCKET, SO_KEEPALIVE, (char *)&tmp, sizeof(tmp));

  sockaddr.sin_family = PF_INET;
  sockaddr.sin_port = htons(port);
  memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
	  sizeof (struct in_addr));

  if (connect (scb->fd, &sockaddr, sizeof(sockaddr)))
    {
      close(scb->fd);
      scb->fd = -1;
      return -1;
    }

  protoent = getprotobyname ("tcp");
  if (!protoent)
    return -1;

  tmp = 1;
  if (setsockopt (scb->fd, protoent->p_proto, TCP_NODELAY,
		  (char *)&tmp, sizeof(tmp)))
    return -1;

  signal(SIGPIPE, SIG_IGN);	/* If we don't do this, then GDB simply exits
				   when the remote side dies.  */

  return 0;
}

static serial_ttystate
tcp_get_tty_state(scb)
     serial_t scb;
{
  struct tcp_ttystate *state;

  state = (struct tcp_ttystate *)xmalloc(sizeof *state);

  return (serial_ttystate)state;
}

static int
tcp_set_tty_state(scb, ttystate)
     serial_t scb;
     serial_ttystate ttystate;
{
  struct tcp_ttystate *state;

  state = (struct tcp_ttystate *)ttystate;

  return 0;
}

static int
tcp_return_0 (scb)
     serial_t scb;
{
  return 0;
}

static void
tcp_raw(scb)
     serial_t scb;
{
  return;			/* Always in raw mode */
}

/* Wait for input on scb, with timeout seconds.  Returns 0 on success,
   otherwise SERIAL_TIMEOUT or SERIAL_ERROR.

   For termio{s}, we actually just setup VTIME if necessary, and let the
   timeout occur in the read() in tcp_read().
 */

static int
wait_for(scb, timeout)
     serial_t scb;
     int timeout;
{
  int numfds;
  struct timeval tv;
  fd_set readfds, exceptfds;

  FD_ZERO (&readfds);
  FD_ZERO (&exceptfds);

  tv.tv_sec = timeout;
  tv.tv_usec = 0;

  FD_SET(scb->fd, &readfds);
  FD_SET(scb->fd, &exceptfds);

  while (1)
    {
      if (timeout >= 0)
	numfds = select(scb->fd+1, &readfds, 0, &exceptfds, &tv);
      else
	numfds = select(scb->fd+1, &readfds, 0, &exceptfds, 0);

      if (numfds <= 0)
	if (numfds == 0)
	  return SERIAL_TIMEOUT;
	else if (errno == EINTR)
	  continue;
	else
	  return SERIAL_ERROR;	/* Got an error from select or poll */

      return 0;
    }
}

/* Read a character with user-specified timeout.  TIMEOUT is number of seconds
   to wait, or -1 to wait forever.  Use timeout of 0 to effect a poll.  Returns
   char if successful.  Returns -2 if timeout expired, EOF if line dropped
   dead, or -3 for any other error (see errno in that case). */

static int
tcp_readchar(scb, timeout)
     serial_t scb;
     int timeout;
{
  int status;

  if (scb->bufcnt-- > 0)
    return *scb->bufp++;

  status = wait_for(scb, timeout);

  if (status < 0)
    return status;

  scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);

  if (scb->bufcnt <= 0)
    if (scb->bufcnt == 0)
      return SERIAL_TIMEOUT;	/* 0 chars means timeout [may need to
				   distinguish between EOF & timeouts
				   someday] */
    else
      return SERIAL_ERROR;	/* Got an error from read */

  scb->bufcnt--;
  scb->bufp = scb->buf;
  return *scb->bufp++;
}

static int
tcp_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
     serial_t scb;
     serial_ttystate new_ttystate;
     serial_ttystate old_ttystate;
{
  return 0;
}

static void
tcp_print_tty_state (scb, ttystate)
     serial_t scb;
     serial_ttystate ttystate;
{
  /* Nothing to print.  */
  return;
}

static int
tcp_setbaudrate(scb, rate)
     serial_t scb;
     int rate;
{
  return 0;			/* Never fails! */
}

static int
tcp_set_process_group (scb, ttystate, group)
     serial_t scb;
     serial_ttystate ttystate;
     int group;
{
  return 0;
}

static int
tcp_write(scb, str, len)
     serial_t scb;
     const char *str;
     int len;
{
  int cc;

  while (len > 0)
    {
      cc = write(scb->fd, str, len);

      if (cc < 0)
	return 1;
      len -= cc;
      str += cc;
    }
  return 0;
}

static void
tcp_close(scb)
     serial_t scb;
{
  if (scb->fd < 0)
    return;

  close(scb->fd);
  scb->fd = -1;
}

static struct serial_ops tcp_ops =
{
  "tcp",
  0,
  tcp_open,
  tcp_close,
  tcp_readchar,
  tcp_write,
  tcp_return_0, /* flush output */
  tcp_return_0, /* flush input */
  tcp_return_0, /* send break */
  tcp_raw,
  tcp_get_tty_state,
  tcp_set_tty_state,
  tcp_print_tty_state,
  tcp_noflush_set_tty_state,
  tcp_setbaudrate,
  tcp_set_process_group
};

void
_initialize_ser_tcp ()
{
  serial_add_interface (&tcp_ops);
}
Commit	Line	Data
38dc5e12 SG	1	/* Serial interface for raw TCP connections on Un*x like systems
	2	Copyright 1992, 1993 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
	19
	20	#include "defs.h"
	21	#include "serial.h"
	22	#include <sys/types.h>
	23	#include <sys/time.h>
	24	#include <netinet/in.h>
	25	#include <arpa/inet.h>
	26	#include <netdb.h>
	27	#include <sys/socket.h>
	28	#include <netinet/tcp.h>
	29	#include "signals.h"
	30
	31	struct tcp_ttystate
	32	{
	33	int bogus;
	34	};
	35
	36	static int tcp_open PARAMS ((serial_t scb, const char *name));
	37	static void tcp_raw PARAMS ((serial_t scb));
	38	static int wait_for PARAMS ((serial_t scb, int timeout));
	39	static int tcp_readchar PARAMS ((serial_t scb, int timeout));
	40	static int tcp_setbaudrate PARAMS ((serial_t scb, int rate));
	41	static int tcp_write PARAMS ((serial_t scb, const char *str, int len));
	42	static void tcp_restore PARAMS ((serial_t scb));
	43	static void tcp_close PARAMS ((serial_t scb));
	44	static serial_ttystate tcp_get_tty_state PARAMS ((serial_t scb));
	45	static int tcp_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
	46
	47	/* Open up a raw tcp socket */
	48
	49	static int
	50	tcp_open(scb, name)
	51	serial_t scb;
	52	const char *name;
	53	{
	54	char *port_str;
	55	int port;
	56	struct hostent *hostent;
	57	struct sockaddr_in sockaddr;
	58	int tmp;
	59	char hostname[100];
69b2f0fe	60	struct protoent *protoent;
38dc5e12 SG	61
	62	port_str = strchr (name, ':');
	63
	64	if (!port_str)
	65	error ("tcp_open: No colon in host name!"); /* Shouldn't ever happen */
	66
a037b21e SG	67	tmp = min (port_str - name, sizeof hostname - 1);
	68	strncpy (hostname, name, tmp); /* Don't want colon */
	69	hostname[tmp] = '\000'; /* Tie off host name */
38dc5e12 SG	70	port = atoi (port_str + 1);
	71
	72	hostent = gethostbyname (hostname);
	73
	74	if (!hostent)
	75	{
a037b21e	76	fprintf (stderr, "%s: unknown host\n", hostname);
38dc5e12 SG	77	errno = ENOENT;
	78	return -1;
	79	}
	80
	81	scb->fd = socket (PF_INET, SOCK_STREAM, 0);
	82	if (scb->fd < 0)
	83	return -1;
	84
	85	/* Allow rapid reuse of this port. */
	86	tmp = 1;
	87	setsockopt (scb->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&tmp, sizeof(tmp));
	88
	89	/* Enable TCP keep alive process. */
	90	tmp = 1;
	91	setsockopt (scb->fd, SOL_SOCKET, SO_KEEPALIVE, (char *)&tmp, sizeof(tmp));
	92
	93	sockaddr.sin_family = PF_INET;
	94	sockaddr.sin_port = htons(port);
	95	memcpy (&sockaddr.sin_addr.s_addr, hostent->h_addr,
	96	sizeof (struct in_addr));
	97
a037b21e	98	if (connect (scb->fd, &sockaddr, sizeof(sockaddr)))
38dc5e12 SG	99	{
38dc5e12 SG	100	close(scb->fd);
a037b21e	101	scb->fd = -1;
38dc5e12 SG	102	return -1;
	103	}
	104
69b2f0fe SG	105	protoent = getprotobyname ("tcp");
	106	if (!protoent)
	107	return -1;
	108
38dc5e12	109	tmp = 1;
69b2f0fe SG	110	if (setsockopt (scb->fd, protoent->p_proto, TCP_NODELAY,
69b2f0fe SG	111	(char *)&tmp, sizeof(tmp)))
38dc5e12 SG	112	return -1;
	113
	114	signal(SIGPIPE, SIG_IGN); /* If we don't do this, then GDB simply exits
	115	when the remote side dies. */
	116
	117	return 0;
	118	}
	119
	120	static serial_ttystate
	121	tcp_get_tty_state(scb)
	122	serial_t scb;
	123	{
	124	struct tcp_ttystate *state;
	125
	126	state = (struct tcp_ttystate )xmalloc(sizeof state);
	127
	128	return (serial_ttystate)state;
	129	}
	130
	131	static int
	132	tcp_set_tty_state(scb, ttystate)
	133	serial_t scb;
	134	serial_ttystate ttystate;
	135	{
	136	struct tcp_ttystate *state;
	137
	138	state = (struct tcp_ttystate *)ttystate;
	139
	140	return 0;
	141	}
	142
c2e247c4	143	static int
704deef2	144	tcp_return_0 (scb)
c2e247c4 JK	145	serial_t scb;
c2e247c4 JK	146	{
c2e247c4 JK	147	return 0;
	148	}
	149
38dc5e12 SG	150	static void
	151	tcp_raw(scb)
	152	serial_t scb;
	153	{
	154	return; /* Always in raw mode */
	155	}
	156
	157	/* Wait for input on scb, with timeout seconds. Returns 0 on success,
	158	otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
	159
	160	For termio{s}, we actually just setup VTIME if necessary, and let the
	161	timeout occur in the read() in tcp_read().
	162	*/
	163
	164	static int
	165	wait_for(scb, timeout)
	166	serial_t scb;
	167	int timeout;
	168	{
	169	int numfds;
	170	struct timeval tv;
a037b21e	171	fd_set readfds, exceptfds;
38dc5e12 SG	172
38dc5e12 SG	173	FD_ZERO (&readfds);
a037b21e	174	FD_ZERO (&exceptfds);
38dc5e12 SG	175
	176	tv.tv_sec = timeout;
	177	tv.tv_usec = 0;
	178
	179	FD_SET(scb->fd, &readfds);
a037b21e	180	FD_SET(scb->fd, &exceptfds);
38dc5e12	181
a037b21e SG	182	while (1)
	183	{
	184	if (timeout >= 0)
	185	numfds = select(scb->fd+1, &readfds, 0, &exceptfds, &tv);
	186	else
	187	numfds = select(scb->fd+1, &readfds, 0, &exceptfds, 0);
	188
	189	if (numfds <= 0)
	190	if (numfds == 0)
	191	return SERIAL_TIMEOUT;
	192	else if (errno == EINTR)
	193	continue;
	194	else
	195	return SERIAL_ERROR; /* Got an error from select or poll */
	196
	197	return 0;
	198	}
38dc5e12 SG	199	}
	200
	201	/* Read a character with user-specified timeout. TIMEOUT is number of seconds
	202	to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
	203	char if successful. Returns -2 if timeout expired, EOF if line dropped
	204	dead, or -3 for any other error (see errno in that case). */
	205
	206	static int
	207	tcp_readchar(scb, timeout)
	208	serial_t scb;
	209	int timeout;
	210	{
	211	int status;
	212
	213	if (scb->bufcnt-- > 0)
	214	return *scb->bufp++;
	215
	216	status = wait_for(scb, timeout);
	217
	218	if (status < 0)
	219	return status;
	220
	221	scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
	222
	223	if (scb->bufcnt <= 0)
	224	if (scb->bufcnt == 0)
	225	return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
	226	distinguish between EOF & timeouts
	227	someday] */
	228	else
	229	return SERIAL_ERROR; /* Got an error from read */
	230
	231	scb->bufcnt--;
	232	scb->bufp = scb->buf;
	233	return *scb->bufp++;
	234	}
	235
c2e247c4 JK	236	static int
	237	tcp_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
	238	serial_t scb;
	239	serial_ttystate new_ttystate;
	240	serial_ttystate old_ttystate;
	241	{
	242	return 0;
	243	}
	244
	245	static void
	246	tcp_print_tty_state (scb, ttystate)
	247	serial_t scb;
	248	serial_ttystate ttystate;
	249	{
	250	/* Nothing to print. */
	251	return;
	252	}
	253
38dc5e12 SG	254	static int
	255	tcp_setbaudrate(scb, rate)
	256	serial_t scb;
	257	int rate;
	258	{
	259	return 0; /* Never fails! */
	260	}
	261
c2e247c4 JK	262	static int
	263	tcp_set_process_group (scb, ttystate, group)
	264	serial_t scb;
	265	serial_ttystate ttystate;
	266	int group;
	267	{
	268	return 0;
	269	}
	270
38dc5e12 SG	271	static int
	272	tcp_write(scb, str, len)
	273	serial_t scb;
	274	const char *str;
	275	int len;
	276	{
	277	int cc;
	278
	279	while (len > 0)
	280	{
	281	cc = write(scb->fd, str, len);
	282
	283	if (cc < 0)
	284	return 1;
	285	len -= cc;
	286	str += cc;
	287	}
	288	return 0;
	289	}
	290
	291	static void
	292	tcp_close(scb)
	293	serial_t scb;
	294	{
	295	if (scb->fd < 0)
	296	return;
	297
	298	close(scb->fd);
	299	scb->fd = -1;
	300	}
	301
	302	static struct serial_ops tcp_ops =
	303	{
	304	"tcp",
	305	0,
	306	tcp_open,
	307	tcp_close,
	308	tcp_readchar,
	309	tcp_write,
704deef2 JK	310	tcp_return_0, /* flush output */
	311	tcp_return_0, /* flush input */
	312	tcp_return_0, /* send break */
38dc5e12 SG	313	tcp_raw,
	314	tcp_get_tty_state,
	315	tcp_set_tty_state,
c2e247c4 JK	316	tcp_print_tty_state,
c2e247c4 JK	317	tcp_noflush_set_tty_state,
38dc5e12	318	tcp_setbaudrate,
c2e247c4	319	tcp_set_process_group
38dc5e12 SG	320	};
	321
	322	void
	323	_initialize_ser_tcp ()
	324	{
	325	serial_add_interface (&tcp_ops);
	326	}