[deliverable/binutils-gdb.git] / gdb / gdbserver / hostio.c

/* Host file transfer support for gdbserver.
   Copyright (C) 2007-2015 Free Software Foundation, Inc.

   Contributed by CodeSourcery.

   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 "server.h"
#include "gdb/fileio.h"
#include "hostio.h"

#include <fcntl.h>
#include <limits.h>
#include <unistd.h>

extern int remote_debug;

struct fd_list
{
  int fd;
  struct fd_list *next;
};

static struct fd_list *open_fds;

static int
safe_fromhex (char a, int *nibble)
{
  if (a >= '0' && a <= '9')
    *nibble = a - '0';
  else if (a >= 'a' && a <= 'f')
    *nibble = a - 'a' + 10;
  else if (a >= 'A' && a <= 'F')
    *nibble = a - 'A' + 10;
  else
    return -1;

  return 0;
}

/* Filenames are hex encoded, so the maximum we can handle is half the
   packet buffer size.  Cap to PATH_MAX, if it is shorter.  */
#if !defined (PATH_MAX) || (PATH_MAX > (PBUFSIZ / 2 + 1))
#  define HOSTIO_PATH_MAX (PBUFSIZ / 2 + 1)
#else
#  define HOSTIO_PATH_MAX PATH_MAX
#endif

static int
require_filename (char **pp, char *filename)
{
  int count;
  char *p;

  p = *pp;
  count = 0;

  while (*p && *p != ',')
    {
      int nib1, nib2;

      /* Don't allow overflow.  */
      if (count >= HOSTIO_PATH_MAX - 1)
	return -1;

      if (safe_fromhex (p[0], &nib1)
	  || safe_fromhex (p[1], &nib2))
	return -1;

      filename[count++] = nib1 * 16 + nib2;
      p += 2;
    }

  filename[count] = '\0';
  *pp = p;
  return 0;
}

static int
require_int (char **pp, int *value)
{
  char *p;
  int count;

  p = *pp;
  *value = 0;
  count = 0;

  while (*p && *p != ',')
    {
      int nib;

      /* Don't allow overflow.  */
      if (count >= 7)
	return -1;

      if (safe_fromhex (p[0], &nib))
	return -1;
      *value = *value * 16 + nib;
      p++;
      count++;
    }

  *pp = p;
  return 0;
}

static int
require_data (char *p, int p_len, char **data, int *data_len)
{
  int input_index, output_index, escaped;

  *data = xmalloc (p_len);

  output_index = 0;
  escaped = 0;
  for (input_index = 0; input_index < p_len; input_index++)
    {
      char b = p[input_index];

      if (escaped)
	{
	  (*data)[output_index++] = b ^ 0x20;
	  escaped = 0;
	}
      else if (b == '}')
	escaped = 1;
      else
	(*data)[output_index++] = b;
    }

  if (escaped)
    {
      free (*data);
      return -1;
    }

  *data_len = output_index;
  return 0;
}

static int
require_comma (char **pp)
{
  if (**pp == ',')
    {
      (*pp)++;
      return 0;
    }
  else
    return -1;
}

static int
require_end (char *p)
{
  if (*p == '\0')
    return 0;
  else
    return -1;
}

static int
require_valid_fd (int fd)
{
  struct fd_list *fd_ptr;

  for (fd_ptr = open_fds; fd_ptr != NULL; fd_ptr = fd_ptr->next)
    if (fd_ptr->fd == fd)
      return 0;

  return -1;
}

/* Fill in own_buf with the last hostio error packet, however it
   suitable for the target.  */
static void
hostio_error (char *own_buf)
{
  the_target->hostio_last_error (own_buf);
}

static void
hostio_packet_error (char *own_buf)
{
  sprintf (own_buf, "F-1,%x", FILEIO_EINVAL);
}

static void
hostio_reply (char *own_buf, int result)
{
  sprintf (own_buf, "F%x", result);
}

static int
hostio_reply_with_data (char *own_buf, char *buffer, int len,
			int *new_packet_len)
{
  int input_index, output_index, out_maxlen;

  sprintf (own_buf, "F%x;", len);
  output_index = strlen (own_buf);

  out_maxlen = PBUFSIZ;

  for (input_index = 0; input_index < len; input_index++)
    {
      char b = buffer[input_index];

      if (b == '$' || b == '#' || b == '}' || b == '*')
	{
	  /* These must be escaped.  */
	  if (output_index + 2 > out_maxlen)
	    break;
	  own_buf[output_index++] = '}';
	  own_buf[output_index++] = b ^ 0x20;
	}
      else
	{
	  if (output_index + 1 > out_maxlen)
	    break;
	  own_buf[output_index++] = b;
	}
    }

  *new_packet_len = output_index;
  return input_index;
}

static int
fileio_open_flags_to_host (int fileio_open_flags, int *open_flags_p)
{
  int open_flags = 0;

  if (fileio_open_flags & ~FILEIO_O_SUPPORTED)
    return -1;

  if (fileio_open_flags & FILEIO_O_CREAT)
    open_flags |= O_CREAT;
  if (fileio_open_flags & FILEIO_O_EXCL)
    open_flags |= O_EXCL;
  if (fileio_open_flags & FILEIO_O_TRUNC)
    open_flags |= O_TRUNC;
  if (fileio_open_flags & FILEIO_O_APPEND)
    open_flags |= O_APPEND;
  if (fileio_open_flags & FILEIO_O_RDONLY)
    open_flags |= O_RDONLY;
  if (fileio_open_flags & FILEIO_O_WRONLY)
    open_flags |= O_WRONLY;
  if (fileio_open_flags & FILEIO_O_RDWR)
    open_flags |= O_RDWR;
/* On systems supporting binary and text mode, always open files in
   binary mode. */
#ifdef O_BINARY
  open_flags |= O_BINARY;
#endif

  *open_flags_p = open_flags;
  return 0;
}

static void
handle_open (char *own_buf)
{
  char filename[HOSTIO_PATH_MAX];
  char *p;
  int fileio_flags, mode, flags, fd;
  struct fd_list *new_fd;

  p = own_buf + strlen ("vFile:open:");

  if (require_filename (&p, filename)
      || require_comma (&p)
      || require_int (&p, &fileio_flags)
      || require_comma (&p)
      || require_int (&p, &mode)
      || require_end (p)
      || fileio_open_flags_to_host (fileio_flags, &flags))
    {
      hostio_packet_error (own_buf);
      return;
    }

  /* We do not need to convert MODE, since the fileio protocol
     uses the standard values.  */
  fd = open (filename, flags, mode);

  if (fd == -1)
    {
      hostio_error (own_buf);
      return;
    }

  /* Record the new file descriptor.  */
  new_fd = xmalloc (sizeof (struct fd_list));
  new_fd->fd = fd;
  new_fd->next = open_fds;
  open_fds = new_fd;

  hostio_reply (own_buf, fd);
}

static void
handle_pread (char *own_buf, int *new_packet_len)
{
  int fd, ret, len, offset, bytes_sent;
  char *p, *data;

  p = own_buf + strlen ("vFile:pread:");

  if (require_int (&p, &fd)
      || require_comma (&p)
      || require_valid_fd (fd)
      || require_int (&p, &len)
      || require_comma (&p)
      || require_int (&p, &offset)
      || require_end (p))
    {
      hostio_packet_error (own_buf);
      return;
    }

  data = xmalloc (len);
#ifdef HAVE_PREAD
  ret = pread (fd, data, len, offset);
#else
  ret = -1;
#endif
  /* If we have no pread or it failed for this file, use lseek/read.  */
  if (ret == -1)
    {
      ret = lseek (fd, offset, SEEK_SET);
      if (ret != -1)
	ret = read (fd, data, len);
    }

  if (ret == -1)
    {
      hostio_error (own_buf);
      free (data);
      return;
    }

  bytes_sent = hostio_reply_with_data (own_buf, data, ret, new_packet_len);

  /* If we were using read, and the data did not all fit in the reply,
     we would have to back up using lseek here.  With pread it does
     not matter.  But we still have a problem; the return value in the
     packet might be wrong, so we must fix it.  This time it will
     definitely fit.  */
  if (bytes_sent < ret)
    bytes_sent = hostio_reply_with_data (own_buf, data, bytes_sent,
					 new_packet_len);

  free (data);
}

static void
handle_pwrite (char *own_buf, int packet_len)
{
  int fd, ret, len, offset;
  char *p, *data;

  p = own_buf + strlen ("vFile:pwrite:");

  if (require_int (&p, &fd)
      || require_comma (&p)
      || require_valid_fd (fd)
      || require_int (&p, &offset)
      || require_comma (&p)
      || require_data (p, packet_len - (p - own_buf), &data, &len))
    {
      hostio_packet_error (own_buf);
      return;
    }

#ifdef HAVE_PWRITE
  ret = pwrite (fd, data, len, offset);
#else
  ret = -1;
#endif
  /* If we have no pwrite or it failed for this file, use lseek/write.  */
  if (ret == -1)
    {
      ret = lseek (fd, offset, SEEK_SET);
      if (ret != -1)
	ret = write (fd, data, len);
    }

  if (ret == -1)
    {
      hostio_error (own_buf);
      free (data);
      return;
    }

  hostio_reply (own_buf, ret);
  free (data);
}

static void
handle_close (char *own_buf)
{
  int fd, ret;
  char *p;
  struct fd_list **open_fd_p, *old_fd;

  p = own_buf + strlen ("vFile:close:");

  if (require_int (&p, &fd)
      || require_valid_fd (fd)
      || require_end (p))
    {
      hostio_packet_error (own_buf);
      return;
    }

  ret = close (fd);

  if (ret == -1)
    {
      hostio_error (own_buf);
      return;
    }

  open_fd_p = &open_fds;
  /* We know that fd is in the list, thanks to require_valid_fd.  */
  while ((*open_fd_p)->fd != fd)
    open_fd_p = &(*open_fd_p)->next;

  old_fd = *open_fd_p;
  *open_fd_p = (*open_fd_p)->next;
  free (old_fd);

  hostio_reply (own_buf, ret);
}

static void
handle_unlink (char *own_buf)
{
  char filename[HOSTIO_PATH_MAX];
  char *p;
  int ret;

  p = own_buf + strlen ("vFile:unlink:");

  if (require_filename (&p, filename)
      || require_end (p))
    {
      hostio_packet_error (own_buf);
      return;
    }

  ret = unlink (filename);

  if (ret == -1)
    {
      hostio_error (own_buf);
      return;
    }

  hostio_reply (own_buf, ret);
}

static void
handle_readlink (char *own_buf, int *new_packet_len)
{
  char filename[HOSTIO_PATH_MAX], linkname[HOSTIO_PATH_MAX];
  char *p;
  int ret, bytes_sent;

  p = own_buf + strlen ("vFile:readlink:");

  if (require_filename (&p, filename)
      || require_end (p))
    {
      hostio_packet_error (own_buf);
      return;
    }

  ret = readlink (filename, linkname, sizeof (linkname) - 1);
  if (ret == -1)
    {
      hostio_error (own_buf);
      return;
    }

  bytes_sent = hostio_reply_with_data (own_buf, linkname, ret, new_packet_len);

  /* If the response does not fit into a single packet, do not attempt
     to return a partial response, but simply fail.  */
  if (bytes_sent < ret)
    sprintf (own_buf, "F-1,%x", FILEIO_ENAMETOOLONG);
}

/* Handle all the 'F' file transfer packets.  */

int
handle_vFile (char *own_buf, int packet_len, int *new_packet_len)
{
  if (strncmp (own_buf, "vFile:open:", 11) == 0)
    handle_open (own_buf);
  else if (strncmp (own_buf, "vFile:pread:", 12) == 0)
    handle_pread (own_buf, new_packet_len);
  else if (strncmp (own_buf, "vFile:pwrite:", 13) == 0)
    handle_pwrite (own_buf, packet_len);
  else if (strncmp (own_buf, "vFile:close:", 12) == 0)
    handle_close (own_buf);
  else if (strncmp (own_buf, "vFile:unlink:", 13) == 0)
    handle_unlink (own_buf);
  else if (strncmp (own_buf, "vFile:readlink:", 15) == 0)
    handle_readlink (own_buf, new_packet_len);
  else
    return 0;

  return 1;
}
Commit	Line	Data
a6b151f1	1	/* Host file transfer support for gdbserver.
32d0add0	2	Copyright (C) 2007-2015 Free Software Foundation, Inc.
a6b151f1 DJ	3
	4	Contributed by CodeSourcery.
	5
	6	This file is part of GDB.
	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
32de4b9d	10	the Free Software Foundation; either version 3 of the License, or
a6b151f1 DJ	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
32de4b9d	19	along with this program. If not, see <http://www.gnu.org/licenses/>. */
a6b151f1 DJ	20
	21	#include "server.h"
	22	#include "gdb/fileio.h"
533b0600	23	#include "hostio.h"
a6b151f1	24
a6b151f1 DJ	25	#include <fcntl.h>
	26	#include <limits.h>
	27	#include <unistd.h>
	28
	29	extern int remote_debug;
	30
	31	struct fd_list
	32	{
	33	int fd;
	34	struct fd_list *next;
	35	};
	36
	37	static struct fd_list *open_fds;
	38
	39	static int
	40	safe_fromhex (char a, int *nibble)
	41	{
	42	if (a >= '0' && a <= '9')
	43	*nibble = a - '0';
	44	else if (a >= 'a' && a <= 'f')
	45	*nibble = a - 'a' + 10;
	46	else if (a >= 'A' && a <= 'F')
	47	*nibble = a - 'A' + 10;
	48	else
	49	return -1;
	50
	51	return 0;
	52	}
	53
d5749ee7 PA	54	/* Filenames are hex encoded, so the maximum we can handle is half the
	55	packet buffer size. Cap to PATH_MAX, if it is shorter. */
	56	#if !defined (PATH_MAX) \|\| (PATH_MAX > (PBUFSIZ / 2 + 1))
	57	# define HOSTIO_PATH_MAX (PBUFSIZ / 2 + 1)
	58	#else
	59	# define HOSTIO_PATH_MAX PATH_MAX
	60	#endif
	61
a6b151f1 DJ	62	static int
	63	require_filename (char *pp, char filename)
	64	{
	65	int count;
	66	char *p;
	67
	68	p = *pp;
	69	count = 0;
	70
	71	while (p && p != ',')
	72	{
	73	int nib1, nib2;
	74
	75	/* Don't allow overflow. */
d5749ee7	76	if (count >= HOSTIO_PATH_MAX - 1)
a6b151f1 DJ	77	return -1;
	78
	79	if (safe_fromhex (p[0], &nib1)
	80	\|\| safe_fromhex (p[1], &nib2))
	81	return -1;
	82
	83	filename[count++] = nib1 * 16 + nib2;
	84	p += 2;
	85	}
	86
	87	filename[count] = '\0';
	88	*pp = p;
	89	return 0;
	90	}
	91
	92	static int
	93	require_int (char *pp, int value)
	94	{
	95	char *p;
	96	int count;
	97
	98	p = *pp;
	99	*value = 0;
	100	count = 0;
	101
	102	while (p && p != ',')
	103	{
	104	int nib;
	105
	106	/* Don't allow overflow. */
	107	if (count >= 7)
	108	return -1;
	109
	110	if (safe_fromhex (p[0], &nib))
	111	return -1;
	112	value = value * 16 + nib;
	113	p++;
	114	count++;
	115	}
	116
	117	*pp = p;
	118	return 0;
	119	}
	120
	121	static int
	122	require_data (char p, int p_len, char data, int data_len)
	123	{
	124	int input_index, output_index, escaped;
	125
bca929d3	126	*data = xmalloc (p_len);
a6b151f1 DJ	127
	128	output_index = 0;
	129	escaped = 0;
	130	for (input_index = 0; input_index < p_len; input_index++)
	131	{
	132	char b = p[input_index];
	133
	134	if (escaped)
	135	{
	136	(*data)[output_index++] = b ^ 0x20;
	137	escaped = 0;
	138	}
	139	else if (b == '}')
	140	escaped = 1;
	141	else
	142	(*data)[output_index++] = b;
	143	}
	144
	145	if (escaped)
9130f83e	146	{
8040bd49	147	free (*data);
9130f83e MS	148	return -1;
9130f83e MS	149	}
a6b151f1 DJ	150
	151	*data_len = output_index;
	152	return 0;
	153	}
	154
	155	static int
	156	require_comma (char **pp)
	157	{
	158	if (**pp == ',')
	159	{
	160	(*pp)++;
	161	return 0;
	162	}
	163	else
	164	return -1;
	165	}
	166
	167	static int
	168	require_end (char *p)
	169	{
	170	if (*p == '\0')
	171	return 0;
	172	else
	173	return -1;
	174	}
	175
	176	static int
	177	require_valid_fd (int fd)
	178	{
	179	struct fd_list *fd_ptr;
	180
	181	for (fd_ptr = open_fds; fd_ptr != NULL; fd_ptr = fd_ptr->next)
	182	if (fd_ptr->fd == fd)
	183	return 0;
	184
	185	return -1;
	186	}
	187
59a016f0 PA	188	/* Fill in own_buf with the last hostio error packet, however it
59a016f0 PA	189	suitable for the target. */
a6b151f1	190	static void
59a016f0	191	hostio_error (char *own_buf)
a6b151f1	192	{
59a016f0	193	the_target->hostio_last_error (own_buf);
a6b151f1 DJ	194	}
	195
	196	static void
	197	hostio_packet_error (char *own_buf)
	198	{
59a016f0	199	sprintf (own_buf, "F-1,%x", FILEIO_EINVAL);
a6b151f1 DJ	200	}
	201
	202	static void
	203	hostio_reply (char *own_buf, int result)
	204	{
	205	sprintf (own_buf, "F%x", result);
	206	}
	207
	208	static int
	209	hostio_reply_with_data (char own_buf, char buffer, int len,
	210	int *new_packet_len)
	211	{
	212	int input_index, output_index, out_maxlen;
	213
	214	sprintf (own_buf, "F%x;", len);
	215	output_index = strlen (own_buf);
	216
	217	out_maxlen = PBUFSIZ;
	218
	219	for (input_index = 0; input_index < len; input_index++)
	220	{
	221	char b = buffer[input_index];
	222
	223	if (b == '$' \|\| b == '#' \|\| b == '}' \|\| b == '*')
	224	{
	225	/* These must be escaped. */
	226	if (output_index + 2 > out_maxlen)
	227	break;
	228	own_buf[output_index++] = '}';
	229	own_buf[output_index++] = b ^ 0x20;
	230	}
	231	else
	232	{
	233	if (output_index + 1 > out_maxlen)
	234	break;
	235	own_buf[output_index++] = b;
	236	}
	237	}
	238
	239	*new_packet_len = output_index;
	240	return input_index;
	241	}
	242
	243	static int
	244	fileio_open_flags_to_host (int fileio_open_flags, int *open_flags_p)
	245	{
	246	int open_flags = 0;
	247
	248	if (fileio_open_flags & ~FILEIO_O_SUPPORTED)
	249	return -1;
	250
	251	if (fileio_open_flags & FILEIO_O_CREAT)
	252	open_flags \|= O_CREAT;
	253	if (fileio_open_flags & FILEIO_O_EXCL)
	254	open_flags \|= O_EXCL;
	255	if (fileio_open_flags & FILEIO_O_TRUNC)
	256	open_flags \|= O_TRUNC;
	257	if (fileio_open_flags & FILEIO_O_APPEND)
	258	open_flags \|= O_APPEND;
	259	if (fileio_open_flags & FILEIO_O_RDONLY)
	260	open_flags \|= O_RDONLY;
	261	if (fileio_open_flags & FILEIO_O_WRONLY)
	262	open_flags \|= O_WRONLY;
	263	if (fileio_open_flags & FILEIO_O_RDWR)
264	open_flags \|= O_RDWR;
265	/* On systems supporting binary and text mode, always open files in
266	binary mode. */
267	#ifdef O_BINARY
268	open_flags \|= O_BINARY;
269	#endif
270
271	*open_flags_p = open_flags;
272	return 0;
273	}
274
275	static void
276	handle_open (char *own_buf)
277	{
d5749ee7	278	char filename[HOSTIO_PATH_MAX];
a6b151f1 DJ	279	char *p;
	280	int fileio_flags, mode, flags, fd;
	281	struct fd_list *new_fd;
	282
	283	p = own_buf + strlen ("vFile:open:");
	284
	285	if (require_filename (&p, filename)
	286	\|\| require_comma (&p)
	287	\|\| require_int (&p, &fileio_flags)
	288	\|\| require_comma (&p)
	289	\|\| require_int (&p, &mode)
	290	\|\| require_end (p)
	291	\|\| fileio_open_flags_to_host (fileio_flags, &flags))
	292	{
	293	hostio_packet_error (own_buf);
	294	return;
	295	}
	296
	297	/* We do not need to convert MODE, since the fileio protocol
	298	uses the standard values. */
	299	fd = open (filename, flags, mode);
	300
	301	if (fd == -1)
	302	{
59a016f0	303	hostio_error (own_buf);
a6b151f1 DJ	304	return;
	305	}
	306
	307	/* Record the new file descriptor. */
bca929d3	308	new_fd = xmalloc (sizeof (struct fd_list));
a6b151f1 DJ	309	new_fd->fd = fd;
	310	new_fd->next = open_fds;
	311	open_fds = new_fd;
	312
	313	hostio_reply (own_buf, fd);
	314	}
	315
	316	static void
	317	handle_pread (char own_buf, int new_packet_len)
	318	{
	319	int fd, ret, len, offset, bytes_sent;
	320	char p, data;
	321
	322	p = own_buf + strlen ("vFile:pread:");
	323
	324	if (require_int (&p, &fd)
	325	\|\| require_comma (&p)
	326	\|\| require_valid_fd (fd)
	327	\|\| require_int (&p, &len)
	328	\|\| require_comma (&p)
	329	\|\| require_int (&p, &offset)
	330	\|\| require_end (p))
	331	{
	332	hostio_packet_error (own_buf);
	333	return;
	334	}
	335
bca929d3	336	data = xmalloc (len);
4e799345	337	#ifdef HAVE_PREAD
a6b151f1	338	ret = pread (fd, data, len, offset);
4e799345	339	#else
7c3270ae	340	ret = -1;
4e799345	341	#endif
7c3270ae UW	342	/* If we have no pread or it failed for this file, use lseek/read. */
	343	if (ret == -1)
	344	{
	345	ret = lseek (fd, offset, SEEK_SET);
	346	if (ret != -1)
	347	ret = read (fd, data, len);
	348	}
a6b151f1 DJ	349
	350	if (ret == -1)
	351	{
59a016f0	352	hostio_error (own_buf);
a6b151f1 DJ	353	free (data);
	354	return;
	355	}
	356
	357	bytes_sent = hostio_reply_with_data (own_buf, data, ret, new_packet_len);
	358
	359	/* If we were using read, and the data did not all fit in the reply,
	360	we would have to back up using lseek here. With pread it does
	361	not matter. But we still have a problem; the return value in the
	362	packet might be wrong, so we must fix it. This time it will
	363	definitely fit. */
	364	if (bytes_sent < ret)
	365	bytes_sent = hostio_reply_with_data (own_buf, data, bytes_sent,
	366	new_packet_len);
	367
	368	free (data);
	369	}
	370
	371	static void
	372	handle_pwrite (char *own_buf, int packet_len)
	373	{
	374	int fd, ret, len, offset;
	375	char p, data;
	376
	377	p = own_buf + strlen ("vFile:pwrite:");
	378
	379	if (require_int (&p, &fd)
	380	\|\| require_comma (&p)
	381	\|\| require_valid_fd (fd)
	382	\|\| require_int (&p, &offset)
	383	\|\| require_comma (&p)
	384	\|\| require_data (p, packet_len - (p - own_buf), &data, &len))
	385	{
	386	hostio_packet_error (own_buf);
	387	return;
	388	}
	389
4e799345	390	#ifdef HAVE_PWRITE
a6b151f1	391	ret = pwrite (fd, data, len, offset);
4e799345	392	#else
7c3270ae	393	ret = -1;
4e799345	394	#endif
7c3270ae UW	395	/* If we have no pwrite or it failed for this file, use lseek/write. */
	396	if (ret == -1)
	397	{
	398	ret = lseek (fd, offset, SEEK_SET);
	399	if (ret != -1)
	400	ret = write (fd, data, len);
	401	}
a6b151f1 DJ	402
	403	if (ret == -1)
	404	{
59a016f0	405	hostio_error (own_buf);
a6b151f1 DJ	406	free (data);
	407	return;
	408	}
	409
	410	hostio_reply (own_buf, ret);
	411	free (data);
	412	}
	413
	414	static void
	415	handle_close (char *own_buf)
	416	{
	417	int fd, ret;
	418	char *p;
	419	struct fd_list *open_fd_p, old_fd;
	420
	421	p = own_buf + strlen ("vFile:close:");
	422
	423	if (require_int (&p, &fd)
	424	\|\| require_valid_fd (fd)
	425	\|\| require_end (p))
	426	{
	427	hostio_packet_error (own_buf);
	428	return;
	429	}
	430
	431	ret = close (fd);
	432
	433	if (ret == -1)
	434	{
59a016f0	435	hostio_error (own_buf);
a6b151f1 DJ	436	return;
	437	}
	438
	439	open_fd_p = &open_fds;
588eebee MS	440	/* We know that fd is in the list, thanks to require_valid_fd. */
588eebee MS	441	while ((*open_fd_p)->fd != fd)
a6b151f1 DJ	442	open_fd_p = &(*open_fd_p)->next;
	443
	444	old_fd = *open_fd_p;
	445	open_fd_p = (open_fd_p)->next;
	446	free (old_fd);
	447
	448	hostio_reply (own_buf, ret);
	449	}
	450
	451	static void
	452	handle_unlink (char *own_buf)
	453	{
d5749ee7	454	char filename[HOSTIO_PATH_MAX];
a6b151f1 DJ	455	char *p;
	456	int ret;
	457
	458	p = own_buf + strlen ("vFile:unlink:");
	459
	460	if (require_filename (&p, filename)
	461	\|\| require_end (p))
	462	{
	463	hostio_packet_error (own_buf);
	464	return;
	465	}
	466
	467	ret = unlink (filename);
	468
	469	if (ret == -1)
	470	{
59a016f0	471	hostio_error (own_buf);
a6b151f1 DJ	472	return;
	473	}
	474
	475	hostio_reply (own_buf, ret);
	476	}
	477
b9e7b9c3 UW	478	static void
	479	handle_readlink (char own_buf, int new_packet_len)
	480	{
d5749ee7	481	char filename[HOSTIO_PATH_MAX], linkname[HOSTIO_PATH_MAX];
b9e7b9c3 UW	482	char *p;
	483	int ret, bytes_sent;
	484
	485	p = own_buf + strlen ("vFile:readlink:");
	486
	487	if (require_filename (&p, filename)
	488	\|\| require_end (p))
	489	{
	490	hostio_packet_error (own_buf);
	491	return;
	492	}
	493
0270a750	494	ret = readlink (filename, linkname, sizeof (linkname) - 1);
b9e7b9c3 UW	495	if (ret == -1)
	496	{
	497	hostio_error (own_buf);
	498	return;
	499	}
	500
	501	bytes_sent = hostio_reply_with_data (own_buf, linkname, ret, new_packet_len);
	502
	503	/* If the response does not fit into a single packet, do not attempt
	504	to return a partial response, but simply fail. */
	505	if (bytes_sent < ret)
	506	sprintf (own_buf, "F-1,%x", FILEIO_ENAMETOOLONG);
	507	}
	508
a6b151f1 DJ	509	/* Handle all the 'F' file transfer packets. */
	510
	511	int
	512	handle_vFile (char own_buf, int packet_len, int new_packet_len)
	513	{
	514	if (strncmp (own_buf, "vFile:open:", 11) == 0)
	515	handle_open (own_buf);
dd2ac174	516	else if (strncmp (own_buf, "vFile:pread:", 12) == 0)
a6b151f1	517	handle_pread (own_buf, new_packet_len);
dd2ac174	518	else if (strncmp (own_buf, "vFile:pwrite:", 13) == 0)
a6b151f1 DJ	519	handle_pwrite (own_buf, packet_len);
	520	else if (strncmp (own_buf, "vFile:close:", 12) == 0)
	521	handle_close (own_buf);
	522	else if (strncmp (own_buf, "vFile:unlink:", 13) == 0)
	523	handle_unlink (own_buf);
b9e7b9c3 UW	524	else if (strncmp (own_buf, "vFile:readlink:", 15) == 0)
b9e7b9c3 UW	525	handle_readlink (own_buf, new_packet_len);
a6b151f1 DJ	526	else
	527	return 0;
	528
	529	return 1;
	530	}