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107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
/* libguestfs
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* Copyright (C) 2011-2025 Red Hat Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <libintl.h>
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#include "guestfs.h"
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#include "guestfs-internal.h"
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/**
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* Read the whole file C<filename> into a memory buffer.
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*
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* The memory buffer is initialized and returned in C<data_r>. The
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* size of the file in bytes is returned in C<size_r>. The return
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* buffer must be freed by the caller.
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*
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* On error this sets the error in the handle and returns C<-1>.
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*
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* For the convenience of callers, the returned buffer is
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* NUL-terminated (the NUL is not included in the size).
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*
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* The file must be a B<regular>, B<local>, B<trusted> file. In
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* particular, do not use this function to read files that might be
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* under control of an untrusted user since that will lead to a
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* denial-of-service attack.
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*/
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int
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guestfs_int_read_whole_file (guestfs_h *g, const char *filename,
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char **data_r, size_t *size_r)
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{
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int fd;
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char *data;
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off_t size;
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off_t n;
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ssize_t r;
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struct stat statbuf;
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fd = open (filename, O_RDONLY|O_CLOEXEC);
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if (fd == -1) {
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perrorf (g, "open: %s", filename);
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return -1;
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}
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if (fstat (fd, &statbuf) == -1) {
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perrorf (g, "stat: %s", filename);
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close (fd);
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return -1;
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}
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size = statbuf.st_size;
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data = safe_malloc (g, size + 1);
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n = 0;
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while (n < size) {
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r = read (fd, &data[n], size - n);
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if (r == -1) {
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perrorf (g, "read: %s", filename);
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free (data);
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close (fd);
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return -1;
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}
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if (r == 0) {
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error (g, _("read: %s: unexpected end of file"), filename);
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free (data);
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close (fd);
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return -1;
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}
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n += r;
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}
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if (close (fd) == -1) {
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perrorf (g, "close: %s", filename);
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free (data);
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return -1;
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}
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/* For convenience of callers, \0-terminate the data. */
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data[size] = '\0';
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*data_r = data;
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if (size_r != NULL)
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*size_r = size;
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return 0;
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}
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