| /* Remote File-I/O communications |
| |
| Copyright (C) 2003-2024 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/>. */ |
| |
| /* See the GDB User Guide for details of the GDB remote protocol. */ |
| |
| #include "event-top.h" |
| #include "extract-store-integer.h" |
| #include "cli/cli-cmds.h" |
| #include "remote.h" |
| #include "gdbsupport/gdb_wait.h" |
| #include <sys/stat.h> |
| #include "remote-fileio.h" |
| #include "gdbsupport/event-loop.h" |
| #include "target.h" |
| #include "filenames.h" |
| #include "gdbsupport/filestuff.h" |
| |
| #include <fcntl.h> |
| #include "gdbsupport/gdb_sys_time.h" |
| #ifdef __CYGWIN__ |
| #include <sys/cygwin.h> |
| #endif |
| #include <signal.h> |
| |
| static struct { |
| int *fd_map; |
| int fd_map_size; |
| } remote_fio_data; |
| |
| #define FIO_FD_INVALID -1 |
| #define FIO_FD_CONSOLE_IN -2 |
| #define FIO_FD_CONSOLE_OUT -3 |
| |
| static int remote_fio_system_call_allowed = 0; |
| |
| static int |
| remote_fileio_init_fd_map (void) |
| { |
| int i; |
| |
| if (!remote_fio_data.fd_map) |
| { |
| remote_fio_data.fd_map = XNEWVEC (int, 10); |
| remote_fio_data.fd_map_size = 10; |
| remote_fio_data.fd_map[0] = FIO_FD_CONSOLE_IN; |
| remote_fio_data.fd_map[1] = FIO_FD_CONSOLE_OUT; |
| remote_fio_data.fd_map[2] = FIO_FD_CONSOLE_OUT; |
| for (i = 3; i < 10; ++i) |
| remote_fio_data.fd_map[i] = FIO_FD_INVALID; |
| } |
| return 3; |
| } |
| |
| static int |
| remote_fileio_resize_fd_map (void) |
| { |
| int i = remote_fio_data.fd_map_size; |
| |
| if (!remote_fio_data.fd_map) |
| return remote_fileio_init_fd_map (); |
| remote_fio_data.fd_map_size += 10; |
| remote_fio_data.fd_map = |
| (int *) xrealloc (remote_fio_data.fd_map, |
| remote_fio_data.fd_map_size * sizeof (int)); |
| for (; i < remote_fio_data.fd_map_size; i++) |
| remote_fio_data.fd_map[i] = FIO_FD_INVALID; |
| return remote_fio_data.fd_map_size - 10; |
| } |
| |
| static int |
| remote_fileio_next_free_fd (void) |
| { |
| int i; |
| |
| for (i = 0; i < remote_fio_data.fd_map_size; ++i) |
| if (remote_fio_data.fd_map[i] == FIO_FD_INVALID) |
| return i; |
| return remote_fileio_resize_fd_map (); |
| } |
| |
| static int |
| remote_fileio_fd_to_targetfd (int fd) |
| { |
| int target_fd = remote_fileio_next_free_fd (); |
| |
| remote_fio_data.fd_map[target_fd] = fd; |
| return target_fd; |
| } |
| |
| static int |
| remote_fileio_map_fd (int target_fd) |
| { |
| remote_fileio_init_fd_map (); |
| if (target_fd < 0 || target_fd >= remote_fio_data.fd_map_size) |
| return FIO_FD_INVALID; |
| return remote_fio_data.fd_map[target_fd]; |
| } |
| |
| static void |
| remote_fileio_close_target_fd (int target_fd) |
| { |
| remote_fileio_init_fd_map (); |
| if (target_fd >= 0 && target_fd < remote_fio_data.fd_map_size) |
| remote_fio_data.fd_map[target_fd] = FIO_FD_INVALID; |
| } |
| |
| static int |
| remote_fileio_oflags_to_host (long flags) |
| { |
| int hflags = 0; |
| |
| if (flags & FILEIO_O_CREAT) |
| hflags |= O_CREAT; |
| if (flags & FILEIO_O_EXCL) |
| hflags |= O_EXCL; |
| if (flags & FILEIO_O_TRUNC) |
| hflags |= O_TRUNC; |
| if (flags & FILEIO_O_APPEND) |
| hflags |= O_APPEND; |
| if (flags & FILEIO_O_RDONLY) |
| hflags |= O_RDONLY; |
| if (flags & FILEIO_O_WRONLY) |
| hflags |= O_WRONLY; |
| if (flags & FILEIO_O_RDWR) |
| hflags |= O_RDWR; |
| /* On systems supporting binary and text mode, always open files in |
| binary mode. */ |
| #ifdef O_BINARY |
| hflags |= O_BINARY; |
| #endif |
| return hflags; |
| } |
| |
| static mode_t |
| remote_fileio_mode_to_host (long mode, int open_call) |
| { |
| mode_t hmode = 0; |
| |
| if (!open_call) |
| { |
| if (mode & FILEIO_S_IFREG) |
| hmode |= S_IFREG; |
| if (mode & FILEIO_S_IFDIR) |
| hmode |= S_IFDIR; |
| if (mode & FILEIO_S_IFCHR) |
| hmode |= S_IFCHR; |
| } |
| if (mode & FILEIO_S_IRUSR) |
| hmode |= S_IRUSR; |
| if (mode & FILEIO_S_IWUSR) |
| hmode |= S_IWUSR; |
| if (mode & FILEIO_S_IXUSR) |
| hmode |= S_IXUSR; |
| #ifdef S_IRGRP |
| if (mode & FILEIO_S_IRGRP) |
| hmode |= S_IRGRP; |
| #endif |
| #ifdef S_IWGRP |
| if (mode & FILEIO_S_IWGRP) |
| hmode |= S_IWGRP; |
| #endif |
| #ifdef S_IXGRP |
| if (mode & FILEIO_S_IXGRP) |
| hmode |= S_IXGRP; |
| #endif |
| if (mode & FILEIO_S_IROTH) |
| hmode |= S_IROTH; |
| #ifdef S_IWOTH |
| if (mode & FILEIO_S_IWOTH) |
| hmode |= S_IWOTH; |
| #endif |
| #ifdef S_IXOTH |
| if (mode & FILEIO_S_IXOTH) |
| hmode |= S_IXOTH; |
| #endif |
| return hmode; |
| } |
| |
| static int |
| remote_fileio_seek_flag_to_host (long num, int *flag) |
| { |
| if (!flag) |
| return 0; |
| switch (num) |
| { |
| case FILEIO_SEEK_SET: |
| *flag = SEEK_SET; |
| break; |
| case FILEIO_SEEK_CUR: |
| *flag = SEEK_CUR; |
| break; |
| case FILEIO_SEEK_END: |
| *flag = SEEK_END; |
| break; |
| default: |
| return -1; |
| } |
| return 0; |
| } |
| |
| static int |
| remote_fileio_extract_long (char **buf, LONGEST *retlong) |
| { |
| char *c; |
| int sign = 1; |
| |
| if (!buf || !*buf || !**buf || !retlong) |
| return -1; |
| c = strchr (*buf, ','); |
| if (c) |
| *c++ = '\0'; |
| else |
| c = strchr (*buf, '\0'); |
| while (strchr ("+-", **buf)) |
| { |
| if (**buf == '-') |
| sign = -sign; |
| ++*buf; |
| } |
| for (*retlong = 0; **buf; ++*buf) |
| { |
| *retlong <<= 4; |
| if (**buf >= '0' && **buf <= '9') |
| *retlong += **buf - '0'; |
| else if (**buf >= 'a' && **buf <= 'f') |
| *retlong += **buf - 'a' + 10; |
| else if (**buf >= 'A' && **buf <= 'F') |
| *retlong += **buf - 'A' + 10; |
| else |
| return -1; |
| } |
| *retlong *= sign; |
| *buf = c; |
| return 0; |
| } |
| |
| static int |
| remote_fileio_extract_int (char **buf, long *retint) |
| { |
| int ret; |
| LONGEST retlong; |
| |
| if (!retint) |
| return -1; |
| ret = remote_fileio_extract_long (buf, &retlong); |
| if (!ret) |
| *retint = (long) retlong; |
| return ret; |
| } |
| |
| static int |
| remote_fileio_extract_ptr_w_len (char **buf, CORE_ADDR *ptrval, int *length) |
| { |
| char *c; |
| LONGEST retlong; |
| |
| if (!buf || !*buf || !**buf || !ptrval || !length) |
| return -1; |
| c = strchr (*buf, '/'); |
| if (!c) |
| return -1; |
| *c++ = '\0'; |
| if (remote_fileio_extract_long (buf, &retlong)) |
| return -1; |
| *ptrval = (CORE_ADDR) retlong; |
| *buf = c; |
| if (remote_fileio_extract_long (buf, &retlong)) |
| return -1; |
| *length = (int) retlong; |
| return 0; |
| } |
| |
| static void |
| remote_fileio_to_fio_long (LONGEST num, fio_long_t fnum) |
| { |
| host_to_bigendian (num, (char *) fnum, 8); |
| } |
| |
| static void |
| remote_fileio_to_fio_timeval (struct timeval *tv, struct fio_timeval *ftv) |
| { |
| host_to_fileio_time (tv->tv_sec, ftv->ftv_sec); |
| remote_fileio_to_fio_long (tv->tv_usec, ftv->ftv_usec); |
| } |
| |
| /* The quit handler originally installed. */ |
| static quit_handler_ftype *remote_fileio_o_quit_handler; |
| |
| /* What to do on a QUIT call while handling a file I/O request. We |
| throw a quit exception, which is caught by remote_fileio_request |
| and translated to an EINTR reply back to the target. */ |
| |
| static void |
| remote_fileio_quit_handler (void) |
| { |
| if (check_quit_flag ()) |
| quit (); |
| } |
| |
| static void |
| remote_fileio_reply (remote_target *remote, int retcode, int error) |
| { |
| char buf[32]; |
| bool ctrl_c = check_quit_flag (); |
| |
| strcpy (buf, "F"); |
| if (retcode < 0) |
| { |
| strcat (buf, "-"); |
| retcode = -retcode; |
| } |
| sprintf (buf + strlen (buf), "%x", retcode); |
| if (error || ctrl_c) |
| { |
| if (error && ctrl_c) |
| error = FILEIO_EINTR; |
| if (error < 0) |
| { |
| strcat (buf, "-"); |
| error = -error; |
| } |
| sprintf (buf + strlen (buf), ",%x", error); |
| if (ctrl_c) |
| strcat (buf, ",C"); |
| } |
| quit_handler = remote_fileio_o_quit_handler; |
| putpkt (remote, buf); |
| } |
| |
| static void |
| remote_fileio_ioerror (remote_target *remote) |
| { |
| remote_fileio_reply (remote, -1, FILEIO_EIO); |
| } |
| |
| static void |
| remote_fileio_badfd (remote_target *remote) |
| { |
| remote_fileio_reply (remote, -1, FILEIO_EBADF); |
| } |
| |
| static void |
| remote_fileio_return_errno (remote_target *remote, int retcode) |
| { |
| remote_fileio_reply (remote, retcode, retcode < 0 |
| ? host_to_fileio_error (errno) : 0); |
| } |
| |
| static void |
| remote_fileio_return_success (remote_target *remote, int retcode) |
| { |
| remote_fileio_reply (remote, retcode, 0); |
| } |
| |
| static void |
| remote_fileio_func_open (remote_target *remote, char *buf) |
| { |
| CORE_ADDR ptrval; |
| int length; |
| long num; |
| int flags, fd; |
| mode_t mode; |
| char *pathname; |
| struct stat st; |
| |
| /* 1. Parameter: Ptr to pathname / length incl. trailing zero. */ |
| if (remote_fileio_extract_ptr_w_len (&buf, &ptrval, &length)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| /* 2. Parameter: open flags */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| flags = remote_fileio_oflags_to_host (num); |
| /* 3. Parameter: open mode */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| mode = remote_fileio_mode_to_host (num, 1); |
| |
| /* Request pathname. */ |
| pathname = (char *) alloca (length); |
| if (target_read_memory (ptrval, (gdb_byte *) pathname, length) != 0) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| |
| /* Check if pathname exists and is not a regular file or directory. If so, |
| return an appropriate error code. Same for trying to open directories |
| for writing. */ |
| if (!stat (pathname, &st)) |
| { |
| if (!S_ISREG (st.st_mode) && !S_ISDIR (st.st_mode)) |
| { |
| remote_fileio_reply (remote, -1, FILEIO_ENODEV); |
| return; |
| } |
| if (S_ISDIR (st.st_mode) |
| && ((flags & O_WRONLY) == O_WRONLY || (flags & O_RDWR) == O_RDWR)) |
| { |
| remote_fileio_reply (remote, -1, FILEIO_EISDIR); |
| return; |
| } |
| } |
| |
| fd = gdb_open_cloexec (pathname, flags, mode).release (); |
| if (fd < 0) |
| { |
| remote_fileio_return_errno (remote, -1); |
| return; |
| } |
| |
| fd = remote_fileio_fd_to_targetfd (fd); |
| remote_fileio_return_success (remote, fd); |
| } |
| |
| static void |
| remote_fileio_func_close (remote_target *remote, char *buf) |
| { |
| long num; |
| int fd; |
| |
| /* Parameter: file descriptor */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| fd = remote_fileio_map_fd ((int) num); |
| if (fd == FIO_FD_INVALID) |
| { |
| remote_fileio_badfd (remote); |
| return; |
| } |
| |
| if (fd != FIO_FD_CONSOLE_IN && fd != FIO_FD_CONSOLE_OUT && close (fd)) |
| remote_fileio_return_errno (remote, -1); |
| remote_fileio_close_target_fd ((int) num); |
| remote_fileio_return_success (remote, 0); |
| } |
| |
| static void |
| remote_fileio_func_read (remote_target *remote, char *buf) |
| { |
| long target_fd, num; |
| LONGEST lnum; |
| CORE_ADDR ptrval; |
| int fd, ret; |
| gdb_byte *buffer; |
| size_t length; |
| off_t old_offset, new_offset; |
| |
| /* 1. Parameter: file descriptor */ |
| if (remote_fileio_extract_int (&buf, &target_fd)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| fd = remote_fileio_map_fd ((int) target_fd); |
| if (fd == FIO_FD_INVALID) |
| { |
| remote_fileio_badfd (remote); |
| return; |
| } |
| /* 2. Parameter: buffer pointer */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| ptrval = (CORE_ADDR) lnum; |
| /* 3. Parameter: buffer length */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| length = (size_t) num; |
| |
| switch (fd) |
| { |
| case FIO_FD_CONSOLE_OUT: |
| remote_fileio_badfd (remote); |
| return; |
| case FIO_FD_CONSOLE_IN: |
| { |
| static char *remaining_buf = NULL; |
| static int remaining_length = 0; |
| |
| buffer = (gdb_byte *) xmalloc (16384); |
| if (remaining_buf) |
| { |
| if (remaining_length > length) |
| { |
| memcpy (buffer, remaining_buf, length); |
| memmove (remaining_buf, remaining_buf + length, |
| remaining_length - length); |
| remaining_length -= length; |
| ret = length; |
| } |
| else |
| { |
| memcpy (buffer, remaining_buf, remaining_length); |
| xfree (remaining_buf); |
| remaining_buf = NULL; |
| ret = remaining_length; |
| } |
| } |
| else |
| { |
| /* Windows (at least XP and Server 2003) has difficulty |
| with large reads from consoles. If a handle is |
| backed by a real console device, overly large reads |
| from the handle will fail and set errno == ENOMEM. |
| On a Windows Server 2003 system where I tested, |
| reading 26608 bytes from the console was OK, but |
| anything above 26609 bytes would fail. The limit has |
| been observed to vary on different systems. So, we |
| limit this read to something smaller than that - by a |
| safe margin, in case the limit depends on system |
| resources or version. */ |
| ret = gdb_stdtargin->read ((char *) buffer, 16383); |
| if (ret > 0 && (size_t)ret > length) |
| { |
| remaining_buf = (char *) xmalloc (ret - length); |
| remaining_length = ret - length; |
| memcpy (remaining_buf, buffer + length, remaining_length); |
| ret = length; |
| } |
| } |
| } |
| break; |
| default: |
| buffer = (gdb_byte *) xmalloc (length); |
| /* POSIX defines EINTR behaviour of read in a weird way. It's allowed |
| for read() to return -1 even if "some" bytes have been read. It |
| has been corrected in SUSv2 but that doesn't help us much... |
| Therefore a complete solution must check how many bytes have been |
| read on EINTR to return a more reliable value to the target */ |
| old_offset = lseek (fd, 0, SEEK_CUR); |
| ret = read (fd, buffer, length); |
| if (ret < 0 && errno == EINTR) |
| { |
| new_offset = lseek (fd, 0, SEEK_CUR); |
| /* If some data has been read, return the number of bytes read. |
| The Ctrl-C flag is set in remote_fileio_reply() anyway. */ |
| if (old_offset != new_offset) |
| ret = new_offset - old_offset; |
| } |
| break; |
| } |
| |
| if (ret > 0) |
| { |
| errno = target_write_memory (ptrval, buffer, ret); |
| if (errno != 0) |
| ret = -1; |
| } |
| |
| if (ret < 0) |
| remote_fileio_return_errno (remote, -1); |
| else |
| remote_fileio_return_success (remote, ret); |
| |
| xfree (buffer); |
| } |
| |
| static void |
| remote_fileio_func_write (remote_target *remote, char *buf) |
| { |
| long target_fd, num; |
| LONGEST lnum; |
| CORE_ADDR ptrval; |
| int fd, ret; |
| gdb_byte *buffer; |
| size_t length; |
| |
| /* 1. Parameter: file descriptor */ |
| if (remote_fileio_extract_int (&buf, &target_fd)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| fd = remote_fileio_map_fd ((int) target_fd); |
| if (fd == FIO_FD_INVALID) |
| { |
| remote_fileio_badfd (remote); |
| return; |
| } |
| /* 2. Parameter: buffer pointer */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| ptrval = (CORE_ADDR) lnum; |
| /* 3. Parameter: buffer length */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| length = (size_t) num; |
| |
| buffer = (gdb_byte *) xmalloc (length); |
| if (target_read_memory (ptrval, buffer, length) != 0) |
| { |
| xfree (buffer); |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| |
| switch (fd) |
| { |
| case FIO_FD_CONSOLE_IN: |
| remote_fileio_badfd (remote); |
| xfree (buffer); |
| return; |
| case FIO_FD_CONSOLE_OUT: |
| { |
| ui_file *file = gdb_stdtarg; |
| file->write ((char *) buffer, length); |
| file->flush (); |
| ret = length; |
| } |
| break; |
| default: |
| ret = write (fd, buffer, length); |
| if (ret < 0 && errno == EACCES) |
| errno = EBADF; /* Cygwin returns EACCESS when writing to a |
| R/O file. */ |
| break; |
| } |
| |
| if (ret < 0) |
| remote_fileio_return_errno (remote, -1); |
| else |
| remote_fileio_return_success (remote, ret); |
| |
| xfree (buffer); |
| } |
| |
| static void |
| remote_fileio_func_lseek (remote_target *remote, char *buf) |
| { |
| long num; |
| LONGEST lnum; |
| int fd, flag; |
| off_t offset, ret; |
| |
| /* 1. Parameter: file descriptor */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| fd = remote_fileio_map_fd ((int) num); |
| if (fd == FIO_FD_INVALID) |
| { |
| remote_fileio_badfd (remote); |
| return; |
| } |
| else if (fd == FIO_FD_CONSOLE_IN || fd == FIO_FD_CONSOLE_OUT) |
| { |
| remote_fileio_reply (remote, -1, FILEIO_ESPIPE); |
| return; |
| } |
| |
| /* 2. Parameter: offset */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| offset = (off_t) lnum; |
| /* 3. Parameter: flag */ |
| if (remote_fileio_extract_int (&buf, &num)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| if (remote_fileio_seek_flag_to_host (num, &flag)) |
| { |
| remote_fileio_reply (remote, -1, FILEIO_EINVAL); |
| return; |
| } |
| |
| ret = lseek (fd, offset, flag); |
| |
| if (ret == (off_t) -1) |
| remote_fileio_return_errno (remote, -1); |
| else |
| remote_fileio_return_success (remote, ret); |
| } |
| |
| static void |
| remote_fileio_func_rename (remote_target *remote, char *buf) |
| { |
| CORE_ADDR old_ptr, new_ptr; |
| int old_len, new_len; |
| char *oldpath, *newpath; |
| int ret, of, nf; |
| struct stat ost, nst; |
| |
| /* 1. Parameter: Ptr to oldpath / length incl. trailing zero */ |
| if (remote_fileio_extract_ptr_w_len (&buf, &old_ptr, &old_len)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| |
| /* 2. Parameter: Ptr to newpath / length incl. trailing zero */ |
| if (remote_fileio_extract_ptr_w_len (&buf, &new_ptr, &new_len)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| |
| /* Request oldpath using 'm' packet */ |
| oldpath = (char *) alloca (old_len); |
| if (target_read_memory (old_ptr, (gdb_byte *) oldpath, old_len) != 0) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| |
| /* Request newpath using 'm' packet */ |
| newpath = (char *) alloca (new_len); |
| if (target_read_memory (new_ptr, (gdb_byte *) newpath, new_len) != 0) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| |
| /* Only operate on regular files and directories. */ |
| of = stat (oldpath, &ost); |
| nf = stat (newpath, &nst); |
| if ((!of && !S_ISREG (ost.st_mode) && !S_ISDIR (ost.st_mode)) |
| || (!nf && !S_ISREG (nst.st_mode) && !S_ISDIR (nst.st_mode))) |
| { |
| remote_fileio_reply (remote, -1, FILEIO_EACCES); |
| return; |
| } |
| |
| ret = rename (oldpath, newpath); |
| |
| if (ret == -1) |
| { |
| /* Special case: newpath is a non-empty directory. Some systems |
| return ENOTEMPTY, some return EEXIST. We coerce that to be |
| always EEXIST. */ |
| if (errno == ENOTEMPTY) |
| errno = EEXIST; |
| #ifdef __CYGWIN__ |
| /* Workaround some Cygwin problems with correct errnos. */ |
| if (errno == EACCES) |
| { |
| if (!of && !nf && S_ISDIR (nst.st_mode)) |
| { |
| if (S_ISREG (ost.st_mode)) |
| errno = EISDIR; |
| else |
| { |
| char oldfullpath[PATH_MAX]; |
| char newfullpath[PATH_MAX]; |
| int len; |
| |
| cygwin_conv_path (CCP_WIN_A_TO_POSIX, oldpath, oldfullpath, |
| PATH_MAX); |
| cygwin_conv_path (CCP_WIN_A_TO_POSIX, newpath, newfullpath, |
| PATH_MAX); |
| len = strlen (oldfullpath); |
| if (IS_DIR_SEPARATOR (newfullpath[len]) |
| && !filename_ncmp (oldfullpath, newfullpath, len)) |
| errno = EINVAL; |
| else |
| errno = EEXIST; |
| } |
| } |
| } |
| #endif |
| |
| remote_fileio_return_errno (remote, -1); |
| } |
| else |
| remote_fileio_return_success (remote, ret); |
| } |
| |
| static void |
| remote_fileio_func_unlink (remote_target *remote, char *buf) |
| { |
| CORE_ADDR ptrval; |
| int length; |
| char *pathname; |
| int ret; |
| struct stat st; |
| |
| /* Parameter: Ptr to pathname / length incl. trailing zero */ |
| if (remote_fileio_extract_ptr_w_len (&buf, &ptrval, &length)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| /* Request pathname using 'm' packet */ |
| pathname = (char *) alloca (length); |
| if (target_read_memory (ptrval, (gdb_byte *) pathname, length) != 0) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| |
| /* Only operate on regular files (and directories, which allows to return |
| the correct return code). */ |
| if (!stat (pathname, &st) && !S_ISREG (st.st_mode) && !S_ISDIR (st.st_mode)) |
| { |
| remote_fileio_reply (remote, -1, FILEIO_ENODEV); |
| return; |
| } |
| |
| ret = unlink (pathname); |
| |
| if (ret == -1) |
| remote_fileio_return_errno (remote, -1); |
| else |
| remote_fileio_return_success (remote, ret); |
| } |
| |
| static void |
| remote_fileio_func_stat (remote_target *remote, char *buf) |
| { |
| CORE_ADDR statptr, nameptr; |
| int ret, namelength; |
| char *pathname; |
| LONGEST lnum; |
| struct stat st; |
| struct fio_stat fst; |
| |
| /* 1. Parameter: Ptr to pathname / length incl. trailing zero */ |
| if (remote_fileio_extract_ptr_w_len (&buf, &nameptr, &namelength)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| |
| /* 2. Parameter: Ptr to struct stat */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| statptr = (CORE_ADDR) lnum; |
| |
| /* Request pathname using 'm' packet */ |
| pathname = (char *) alloca (namelength); |
| if (target_read_memory (nameptr, (gdb_byte *) pathname, namelength) != 0) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| |
| ret = stat (pathname, &st); |
| |
| if (ret == -1) |
| { |
| remote_fileio_return_errno (remote, -1); |
| return; |
| } |
| /* Only operate on regular files and directories. */ |
| if (!ret && !S_ISREG (st.st_mode) && !S_ISDIR (st.st_mode)) |
| { |
| remote_fileio_reply (remote, -1, FILEIO_EACCES); |
| return; |
| } |
| if (statptr) |
| { |
| host_to_fileio_stat (&st, &fst); |
| host_to_fileio_uint (0, fst.fst_dev); |
| |
| errno = target_write_memory (statptr, (gdb_byte *) &fst, sizeof fst); |
| if (errno != 0) |
| { |
| remote_fileio_return_errno (remote, -1); |
| return; |
| } |
| } |
| remote_fileio_return_success (remote, ret); |
| } |
| |
| static void |
| remote_fileio_func_fstat (remote_target *remote, char *buf) |
| { |
| CORE_ADDR ptrval; |
| int fd, ret; |
| long target_fd; |
| LONGEST lnum; |
| struct stat st; |
| struct fio_stat fst; |
| struct timeval tv; |
| |
| /* 1. Parameter: file descriptor */ |
| if (remote_fileio_extract_int (&buf, &target_fd)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| fd = remote_fileio_map_fd ((int) target_fd); |
| if (fd == FIO_FD_INVALID) |
| { |
| remote_fileio_badfd (remote); |
| return; |
| } |
| /* 2. Parameter: Ptr to struct stat */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| ptrval = (CORE_ADDR) lnum; |
| |
| if (fd == FIO_FD_CONSOLE_IN || fd == FIO_FD_CONSOLE_OUT) |
| { |
| host_to_fileio_uint (1, fst.fst_dev); |
| memset (&st, 0, sizeof (st)); |
| st.st_mode = S_IFCHR | (fd == FIO_FD_CONSOLE_IN ? S_IRUSR : S_IWUSR); |
| st.st_nlink = 1; |
| #ifdef HAVE_GETUID |
| st.st_uid = getuid (); |
| #endif |
| #ifdef HAVE_GETGID |
| st.st_gid = getgid (); |
| #endif |
| #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
| st.st_blksize = 512; |
| #endif |
| #if HAVE_STRUCT_STAT_ST_BLOCKS |
| st.st_blocks = 0; |
| #endif |
| if (!gettimeofday (&tv, NULL)) |
| st.st_atime = st.st_mtime = st.st_ctime = tv.tv_sec; |
| else |
| st.st_atime = st.st_mtime = st.st_ctime = (time_t) 0; |
| ret = 0; |
| } |
| else |
| ret = fstat (fd, &st); |
| |
| if (ret == -1) |
| { |
| remote_fileio_return_errno (remote, -1); |
| return; |
| } |
| if (ptrval) |
| { |
| host_to_fileio_stat (&st, &fst); |
| |
| errno = target_write_memory (ptrval, (gdb_byte *) &fst, sizeof fst); |
| if (errno != 0) |
| { |
| remote_fileio_return_errno (remote, -1); |
| return; |
| } |
| } |
| remote_fileio_return_success (remote, ret); |
| } |
| |
| static void |
| remote_fileio_func_gettimeofday (remote_target *remote, char *buf) |
| { |
| LONGEST lnum; |
| CORE_ADDR ptrval; |
| int ret; |
| struct timeval tv; |
| struct fio_timeval ftv; |
| |
| /* 1. Parameter: struct timeval pointer */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| ptrval = (CORE_ADDR) lnum; |
| /* 2. Parameter: some pointer value... */ |
| if (remote_fileio_extract_long (&buf, &lnum)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| /* ...which has to be NULL. */ |
| if (lnum) |
| { |
| remote_fileio_reply (remote, -1, FILEIO_EINVAL); |
| return; |
| } |
| |
| ret = gettimeofday (&tv, NULL); |
| |
| if (ret == -1) |
| { |
| remote_fileio_return_errno (remote, -1); |
| return; |
| } |
| |
| if (ptrval) |
| { |
| remote_fileio_to_fio_timeval (&tv, &ftv); |
| |
| errno = target_write_memory (ptrval, (gdb_byte *) &ftv, sizeof ftv); |
| if (errno != 0) |
| { |
| remote_fileio_return_errno (remote, -1); |
| return; |
| } |
| } |
| remote_fileio_return_success (remote, ret); |
| } |
| |
| static void |
| remote_fileio_func_isatty (remote_target *remote, char *buf) |
| { |
| long target_fd; |
| int fd; |
| |
| /* Parameter: file descriptor */ |
| if (remote_fileio_extract_int (&buf, &target_fd)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| fd = remote_fileio_map_fd ((int) target_fd); |
| int ret = fd == FIO_FD_CONSOLE_IN || fd == FIO_FD_CONSOLE_OUT ? 1 : 0; |
| remote_fileio_return_success (remote, ret); |
| } |
| |
| static void |
| remote_fileio_func_system (remote_target *remote, char *buf) |
| { |
| CORE_ADDR ptrval; |
| int ret, length; |
| char *cmdline = NULL; |
| |
| /* Parameter: Ptr to commandline / length incl. trailing zero */ |
| if (remote_fileio_extract_ptr_w_len (&buf, &ptrval, &length)) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| |
| if (length) |
| { |
| /* Request commandline using 'm' packet */ |
| cmdline = (char *) alloca (length); |
| if (target_read_memory (ptrval, (gdb_byte *) cmdline, length) != 0) |
| { |
| remote_fileio_ioerror (remote); |
| return; |
| } |
| } |
| |
| /* Check if system(3) has been explicitly allowed using the |
| `set remote system-call-allowed 1' command. If length is 0, |
| indicating a NULL parameter to the system call, return zero to |
| indicate a shell is not available. Otherwise fail with EPERM. */ |
| if (!remote_fio_system_call_allowed) |
| { |
| if (!length) |
| remote_fileio_return_success (remote, 0); |
| else |
| remote_fileio_reply (remote, -1, FILEIO_EPERM); |
| return; |
| } |
| |
| ret = system (cmdline); |
| |
| if (!length) |
| remote_fileio_return_success (remote, ret); |
| else if (ret == -1) |
| remote_fileio_return_errno (remote, -1); |
| else |
| remote_fileio_return_success (remote, WEXITSTATUS (ret)); |
| } |
| |
| static struct { |
| const char *name; |
| void (*func)(remote_target *remote, char *); |
| } remote_fio_func_map[] = { |
| { "open", remote_fileio_func_open }, |
| { "close", remote_fileio_func_close }, |
| { "read", remote_fileio_func_read }, |
| { "write", remote_fileio_func_write }, |
| { "lseek", remote_fileio_func_lseek }, |
| { "rename", remote_fileio_func_rename }, |
| { "unlink", remote_fileio_func_unlink }, |
| { "stat", remote_fileio_func_stat }, |
| { "fstat", remote_fileio_func_fstat }, |
| { "gettimeofday", remote_fileio_func_gettimeofday }, |
| { "isatty", remote_fileio_func_isatty }, |
| { "system", remote_fileio_func_system }, |
| { NULL, NULL } |
| }; |
| |
| static void |
| do_remote_fileio_request (remote_target *remote, char *buf) |
| { |
| char *c; |
| int idx; |
| |
| quit_handler = remote_fileio_quit_handler; |
| |
| c = strchr (++buf, ','); |
| if (c) |
| *c++ = '\0'; |
| else |
| c = strchr (buf, '\0'); |
| for (idx = 0; remote_fio_func_map[idx].name; ++idx) |
| if (!strcmp (remote_fio_func_map[idx].name, buf)) |
| break; |
| if (!remote_fio_func_map[idx].name) |
| remote_fileio_reply (remote, -1, FILEIO_ENOSYS); |
| else |
| remote_fio_func_map[idx].func (remote, c); |
| } |
| |
| /* Close any open descriptors, and reinitialize the file mapping. */ |
| |
| void |
| remote_fileio_reset (void) |
| { |
| int ix; |
| |
| for (ix = 0; ix != remote_fio_data.fd_map_size; ix++) |
| { |
| int fd = remote_fio_data.fd_map[ix]; |
| |
| if (fd >= 0) |
| close (fd); |
| } |
| if (remote_fio_data.fd_map) |
| { |
| xfree (remote_fio_data.fd_map); |
| remote_fio_data.fd_map = NULL; |
| remote_fio_data.fd_map_size = 0; |
| } |
| } |
| |
| /* Handle a file I/O request. BUF points to the packet containing the |
| request. CTRLC_PENDING_P should be nonzero if the target has not |
| acknowledged the Ctrl-C sent asynchronously earlier. */ |
| |
| void |
| remote_fileio_request (remote_target *remote, char *buf, int ctrlc_pending_p) |
| { |
| /* Save the previous quit handler, so we can restore it. No need |
| for a cleanup since we catch all exceptions below. Note that the |
| quit handler is also restored by remote_fileio_reply just before |
| pushing a packet. */ |
| remote_fileio_o_quit_handler = quit_handler; |
| |
| if (ctrlc_pending_p) |
| { |
| /* If the target hasn't responded to the Ctrl-C sent |
| asynchronously earlier, take this opportunity to send the |
| Ctrl-C synchronously. */ |
| set_quit_flag (); |
| remote_fileio_reply (remote, -1, FILEIO_EINTR); |
| } |
| else |
| { |
| try |
| { |
| do_remote_fileio_request (remote, buf); |
| } |
| catch (const gdb_exception_forced_quit &ex) |
| { |
| throw; |
| } |
| catch (const gdb_exception_quit &ex) |
| { |
| remote_fileio_reply (remote, -1, FILEIO_EINTR); |
| } |
| catch (const gdb_exception &ex) |
| { |
| remote_fileio_reply (remote, -1, FILEIO_EIO); |
| } |
| } |
| |
| quit_handler = remote_fileio_o_quit_handler; |
| } |
| |
| |
| /* Unpack an fio_uint_t. */ |
| |
| static unsigned int |
| remote_fileio_to_host_uint (fio_uint_t fnum) |
| { |
| return extract_unsigned_integer ((gdb_byte *) fnum, 4, |
| BFD_ENDIAN_BIG); |
| } |
| |
| /* Unpack an fio_ulong_t. */ |
| |
| static ULONGEST |
| remote_fileio_to_host_ulong (fio_ulong_t fnum) |
| { |
| return extract_unsigned_integer ((gdb_byte *) fnum, 8, |
| BFD_ENDIAN_BIG); |
| } |
| |
| /* Unpack an fio_mode_t. */ |
| |
| static mode_t |
| remote_fileio_to_host_mode (fio_mode_t fnum) |
| { |
| return remote_fileio_mode_to_host (remote_fileio_to_host_uint (fnum), |
| 0); |
| } |
| |
| /* Unpack an fio_time_t. */ |
| |
| static time_t |
| remote_fileio_to_host_time (fio_time_t fnum) |
| { |
| return remote_fileio_to_host_uint (fnum); |
| } |
| |
| |
| /* See remote-fileio.h. */ |
| |
| void |
| remote_fileio_to_host_stat (struct fio_stat *fst, struct stat *st) |
| { |
| memset (st, 0, sizeof (struct stat)); |
| |
| st->st_dev = remote_fileio_to_host_uint (fst->fst_dev); |
| st->st_ino = remote_fileio_to_host_uint (fst->fst_ino); |
| st->st_mode = remote_fileio_to_host_mode (fst->fst_mode); |
| st->st_nlink = remote_fileio_to_host_uint (fst->fst_nlink); |
| st->st_uid = remote_fileio_to_host_uint (fst->fst_uid); |
| st->st_gid = remote_fileio_to_host_uint (fst->fst_gid); |
| st->st_rdev = remote_fileio_to_host_uint (fst->fst_rdev); |
| st->st_size = remote_fileio_to_host_ulong (fst->fst_size); |
| #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
| st->st_blksize = remote_fileio_to_host_ulong (fst->fst_blksize); |
| #endif |
| #if HAVE_STRUCT_STAT_ST_BLOCKS |
| st->st_blocks = remote_fileio_to_host_ulong (fst->fst_blocks); |
| #endif |
| st->st_atime = remote_fileio_to_host_time (fst->fst_atime); |
| st->st_mtime = remote_fileio_to_host_time (fst->fst_mtime); |
| st->st_ctime = remote_fileio_to_host_time (fst->fst_ctime); |
| } |
| |
| |
| static void |
| set_system_call_allowed (const char *args, int from_tty) |
| { |
| if (args) |
| { |
| char *arg_end; |
| int val = strtoul (args, &arg_end, 10); |
| |
| if (*args && *arg_end == '\0') |
| { |
| remote_fio_system_call_allowed = !!val; |
| return; |
| } |
| } |
| error (_("Illegal argument for \"set remote system-call-allowed\" command")); |
| } |
| |
| static void |
| show_system_call_allowed (const char *args, int from_tty) |
| { |
| if (args) |
| error (_("Garbage after \"show remote " |
| "system-call-allowed\" command: `%s'"), args); |
| gdb_printf ("Calling host system(3) call from target is %sallowed\n", |
| remote_fio_system_call_allowed ? "" : "not "); |
| } |
| |
| void |
| initialize_remote_fileio (struct cmd_list_element **remote_set_cmdlist, |
| struct cmd_list_element **remote_show_cmdlist) |
| { |
| add_cmd ("system-call-allowed", no_class, |
| set_system_call_allowed, |
| _("Set if the host system(3) call is allowed for the target."), |
| remote_set_cmdlist); |
| add_cmd ("system-call-allowed", no_class, |
| show_system_call_allowed, |
| _("Show if the host system(3) call is allowed for the target."), |
| remote_show_cmdlist); |
| } |