/* Host file transfer support for gdbserver.
- Copyright (C) 2007, 2008 Free Software Foundation, Inc.
+ Copyright (C) 2007-2020 Free Software Foundation, Inc.
Contributed by CodeSourcery.
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
+ 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,
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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ 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;
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "gdbsupport/fileio.h"
struct fd_list
{
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 nib1, nib2;
/* Don't allow overflow. */
- if (count >= PATH_MAX - 1)
+ if (count >= HOSTIO_PATH_MAX - 1)
return -1;
if (safe_fromhex (p[0], &nib1)
require_int (char **pp, int *value)
{
char *p;
- int count;
+ int count, firstdigit;
p = *pp;
*value = 0;
count = 0;
+ firstdigit = -1;
while (*p && *p != ',')
{
int nib;
- /* Don't allow overflow. */
- if (count >= 7)
+ if (safe_fromhex (p[0], &nib))
return -1;
- if (safe_fromhex (p[0], &nib))
+ if (firstdigit == -1)
+ firstdigit = nib;
+
+ /* Don't allow overflow. */
+ if (count >= 8 || (count == 7 && firstdigit >= 0x8))
return -1;
+
*value = *value * 16 + nib;
p++;
count++;
{
int input_index, output_index, escaped;
- *data = malloc (p_len);
+ *data = (char *) xmalloc (p_len);
output_index = 0;
escaped = 0;
}
if (escaped)
- return -1;
+ {
+ free (*data);
+ return -1;
+ }
*data_len = output_index;
return 0;
return input_index;
}
-static int
-fileio_open_flags_to_host (int fileio_open_flags, int *open_flags_p)
+/* Process ID of inferior whose filesystem hostio functions
+ that take FILENAME arguments will use. Zero means to use
+ our own filesystem. */
+
+static int hostio_fs_pid;
+
+/* See hostio.h. */
+
+void
+hostio_handle_new_gdb_connection (void)
{
- int open_flags = 0;
+ hostio_fs_pid = 0;
+}
- if (fileio_open_flags & ~FILEIO_O_SUPPORTED)
- return -1;
+/* Handle a "vFile:setfs:" packet. */
- 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
+static void
+handle_setfs (char *own_buf)
+{
+ char *p;
+ int pid;
+
+ /* If the target doesn't have any of the in-filesystem-of methods
+ then there's no point in GDB sending "vFile:setfs:" packets. We
+ reply with an empty packet (i.e. we pretend we don't understand
+ "vFile:setfs:") and that should stop GDB sending any more. */
+ if (the_target->multifs_open == NULL
+ && the_target->multifs_unlink == NULL
+ && the_target->multifs_readlink == NULL)
+ {
+ own_buf[0] = '\0';
+ return;
+ }
- *open_flags_p = open_flags;
- return 0;
+ p = own_buf + strlen ("vFile:setfs:");
+
+ if (require_int (&p, &pid)
+ || pid < 0
+ || require_end (p))
+ {
+ hostio_packet_error (own_buf);
+ return;
+ }
+
+ hostio_fs_pid = pid;
+
+ hostio_reply (own_buf, 0);
}
static void
handle_open (char *own_buf)
{
- char filename[PATH_MAX];
+ char filename[HOSTIO_PATH_MAX];
char *p;
- int fileio_flags, mode, flags, fd;
+ int fileio_flags, fileio_mode, flags, fd;
+ mode_t mode;
struct fd_list *new_fd;
p = own_buf + strlen ("vFile:open:");
|| require_comma (&p)
|| require_int (&p, &fileio_flags)
|| require_comma (&p)
- || require_int (&p, &mode)
+ || require_int (&p, &fileio_mode)
|| require_end (p)
- || fileio_open_flags_to_host (fileio_flags, &flags))
+ || fileio_to_host_openflags (fileio_flags, &flags)
+ || fileio_to_host_mode (fileio_mode, &mode))
{
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 (hostio_fs_pid != 0 && the_target->multifs_open != NULL)
+ fd = the_target->multifs_open (hostio_fs_pid, filename,
+ flags, mode);
+ else
+ fd = open (filename, flags, mode);
if (fd == -1)
{
}
/* Record the new file descriptor. */
- new_fd = malloc (sizeof (struct fd_list));
+ new_fd = XNEW (struct fd_list);
new_fd->fd = fd;
new_fd->next = open_fds;
open_fds = new_fd;
{
int fd, ret, len, offset, bytes_sent;
char *p, *data;
+ static int max_reply_size = -1;
p = own_buf + strlen ("vFile:pread:");
return;
}
- data = malloc (len);
+ /* Do not attempt to read more than the maximum number of bytes
+ hostio_reply_with_data can fit in a packet. We may still read
+ too much because of escaping, but this is handled below. */
+ if (max_reply_size == -1)
+ {
+ sprintf (own_buf, "F%x;", PBUFSIZ);
+ max_reply_size = PBUFSIZ - strlen (own_buf);
+ }
+ if (len > max_reply_size)
+ len = max_reply_size;
+
+ data = (char *) xmalloc (len);
#ifdef HAVE_PREAD
ret = pread (fd, data, len, offset);
#else
- ret = lseek (fd, offset, SEEK_SET);
- if (ret != -1)
- ret = read (fd, data, len);
+ 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)
{
#ifdef HAVE_PWRITE
ret = pwrite (fd, data, len, offset);
#else
- ret = lseek (fd, offset, SEEK_SET);
- if (ret != -1)
- ret = write (fd, data, len);
+ 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)
{
free (data);
}
+static void
+handle_fstat (char *own_buf, int *new_packet_len)
+{
+ int fd, bytes_sent;
+ char *p;
+ struct stat st;
+ struct fio_stat fst;
+
+ p = own_buf + strlen ("vFile:fstat:");
+
+ if (require_int (&p, &fd)
+ || require_valid_fd (fd)
+ || require_end (p))
+ {
+ hostio_packet_error (own_buf);
+ return;
+ }
+
+ if (fstat (fd, &st) == -1)
+ {
+ hostio_error (own_buf);
+ return;
+ }
+
+ host_to_fileio_stat (&st, &fst);
+
+ bytes_sent = hostio_reply_with_data (own_buf,
+ (char *) &fst, sizeof (fst),
+ 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 < sizeof (fst))
+ write_enn (own_buf);
+}
+
static void
handle_close (char *own_buf)
{
}
open_fd_p = &open_fds;
- while (*open_fd_p && (*open_fd_p)->fd != fd)
+ /* 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;
static void
handle_unlink (char *own_buf)
{
- char filename[PATH_MAX];
+ char filename[HOSTIO_PATH_MAX];
char *p;
int ret;
return;
}
- ret = unlink (filename);
+ if (hostio_fs_pid != 0 && the_target->multifs_unlink != NULL)
+ ret = the_target->multifs_unlink (hostio_fs_pid, filename);
+ else
+ ret = unlink (filename);
if (ret == -1)
{
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;
+ }
+
+ if (hostio_fs_pid != 0 && the_target->multifs_readlink != NULL)
+ ret = the_target->multifs_readlink (hostio_fs_pid, filename,
+ linkname,
+ sizeof (linkname) - 1);
+ else
+ 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)
+ if (startswith (own_buf, "vFile:open:"))
handle_open (own_buf);
- else if (strncmp (own_buf, "vFile:pread:", 11) == 0)
+ else if (startswith (own_buf, "vFile:pread:"))
handle_pread (own_buf, new_packet_len);
- else if (strncmp (own_buf, "vFile:pwrite:", 12) == 0)
+ else if (startswith (own_buf, "vFile:pwrite:"))
handle_pwrite (own_buf, packet_len);
- else if (strncmp (own_buf, "vFile:close:", 12) == 0)
+ else if (startswith (own_buf, "vFile:fstat:"))
+ handle_fstat (own_buf, new_packet_len);
+ else if (startswith (own_buf, "vFile:close:"))
handle_close (own_buf);
- else if (strncmp (own_buf, "vFile:unlink:", 13) == 0)
+ else if (startswith (own_buf, "vFile:unlink:"))
handle_unlink (own_buf);
+ else if (startswith (own_buf, "vFile:readlink:"))
+ handle_readlink (own_buf, new_packet_len);
+ else if (startswith (own_buf, "vFile:setfs:"))
+ handle_setfs (own_buf);
else
return 0;
projects / deliverable / binutils-gdb.git / blobdiff