diff options
Diffstat (limited to 'gdb/gdbserver/hostio.c')
| -rw-r--r-- | gdb/gdbserver/hostio.c | 480 |
1 files changed, 480 insertions, 0 deletions
diff --git a/gdb/gdbserver/hostio.c b/gdb/gdbserver/hostio.c new file mode 100644 index 00000000000..d1f13615163 --- /dev/null +++ b/gdb/gdbserver/hostio.c @@ -0,0 +1,480 @@ +/* Host file transfer support for gdbserver. + Copyright (C) 2006 + 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 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., 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. */ + +#include "server.h" +#include "gdb/fileio.h" + +#include <errno.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; +} + +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 >= 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 = malloc (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) + 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; +} + +static int +errno_to_fileio_errno (int error) +{ + switch (error) + { + case EPERM: + return FILEIO_EPERM; + case ENOENT: + return FILEIO_ENOENT; + case EINTR: + return FILEIO_EINTR; + case EIO: + return FILEIO_EIO; + case EBADF: + return FILEIO_EBADF; + case EACCES: + return FILEIO_EACCES; + case EFAULT: + return FILEIO_EFAULT; + case EBUSY: + return FILEIO_EBUSY; + case EEXIST: + return FILEIO_EEXIST; + case ENODEV: + return FILEIO_ENODEV; + case ENOTDIR: + return FILEIO_ENOTDIR; + case EISDIR: + return FILEIO_EISDIR; + case EINVAL: + return FILEIO_EINVAL; + case ENFILE: + return FILEIO_ENFILE; + case EMFILE: + return FILEIO_EMFILE; + case EFBIG: + return FILEIO_EFBIG; + case ENOSPC: + return FILEIO_ENOSPC; + case ESPIPE: + return FILEIO_ESPIPE; + case EROFS: + return FILEIO_EROFS; + case ENOSYS: + return FILEIO_ENOSYS; + case ENAMETOOLONG: + return FILEIO_ENAMETOOLONG; + } + return FILEIO_EUNKNOWN; +} + +static void +hostio_error (char *own_buf, int error) +{ + int fileio_error = errno_to_fileio_errno (error); + + sprintf (own_buf, "F-1,%x", fileio_error); +} + +static void +hostio_packet_error (char *own_buf) +{ + hostio_error (own_buf, 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_fopen (char *own_buf) +{ + char filename[PATH_MAX]; + char *p; + int fileio_flags, mode, flags, fd; + struct fd_list *new_fd; + + p = own_buf + strlen ("Fopen,"); + + 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, errno); + return; + } + + /* Record the new file descriptor. */ + new_fd = malloc (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_fread (char *own_buf, int *new_packet_len) +{ + int fd, ret, len, bytes_sent; + char *p, *data; + + p = own_buf + strlen ("Fread,"); + + if (require_int (&p, &fd) + || require_comma (&p) + || require_valid_fd (fd) + || require_int (&p, &len) + || require_end (p)) + { + hostio_packet_error (own_buf); + return; + } + + data = malloc (len); + ret = read (fd, data, len); + + if (ret == -1) + { + hostio_error (own_buf, errno); + free (data); + return; + } + + bytes_sent = hostio_reply_with_data (own_buf, data, ret, new_packet_len); + + /* If all the data could not fit in the reply, back up the file + pointer for the next read. */ + if (bytes_sent < ret) + lseek (fd, bytes_sent - ret, SEEK_CUR); + + free (data); +} + +static void +handle_fwrite (char *own_buf, int packet_len) +{ + int fd, ret, len; + char *p, *data; + + p = own_buf + strlen ("Fwrite,"); + + if (require_int (&p, &fd) + || require_comma (&p) + || require_valid_fd (fd) + || require_data (p, packet_len - (p - own_buf), &data, &len)) + { + hostio_packet_error (own_buf); + return; + } + + ret = write (fd, data, len); + + if (ret == -1) + { + hostio_error (own_buf, errno); + free (data); + return; + } + + hostio_reply (own_buf, ret); + free (data); +} + +static void +handle_fclose (char *own_buf) +{ + int fd, ret; + char *p; + struct fd_list **open_fd_p, *old_fd; + + p = own_buf + strlen ("Fclose,"); + + 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, errno); + return; + } + + open_fd_p = &open_fds; + while (*open_fd_p && (*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); +} + +/* Handle all the 'F' file transfer packets. */ + +int +handle_f_hostio (char *own_buf, int packet_len, int *new_packet_len) +{ + if (strncmp (own_buf, "Fopen,", 6) == 0) + handle_fopen (own_buf); + else if (strncmp (own_buf, "Fread,", 6) == 0) + handle_fread (own_buf, new_packet_len); + else if (strncmp (own_buf, "Fwrite,", 7) == 0) + handle_fwrite (own_buf, packet_len); + else if (strncmp (own_buf, "Fclose,", 7) == 0) + handle_fclose (own_buf); + else + return 0; + + return 1; +} |