mirror of
https://github.com/libguestfs/libguestfs.git
synced 2026-03-22 07:03:38 +00:00
131 lines
2.7 KiB
C
131 lines
2.7 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <config.h>
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#define _GNU_SOURCE /* for futimens(2) */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.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 "../src/guestfs_protocol.h"
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#include "daemon.h"
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#include "actions.h"
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int
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do_touch (const char *path)
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{
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int fd;
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NEED_ROOT (-1);
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ABS_PATH (path, -1);
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CHROOT_IN;
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fd = open (path, O_WRONLY | O_CREAT | O_NOCTTY | O_NONBLOCK, 0666);
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CHROOT_OUT;
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if (fd == -1) {
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reply_with_perror ("open: %s", path);
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return -1;
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}
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if (futimens (fd, NULL) == -1) {
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reply_with_perror ("futimens: %s", path);
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close (fd);
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return -1;
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}
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close (fd);
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return 0;
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}
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char *
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do_cat (const char *path)
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{
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int fd;
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int alloc, size, r, max;
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char *buf, *buf2;
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NEED_ROOT (NULL);
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ABS_PATH (path,NULL);
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CHROOT_IN;
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fd = open (path, O_RDONLY);
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CHROOT_OUT;
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if (fd == -1) {
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reply_with_perror ("open: %s", path);
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return NULL;
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}
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/* Read up to GUESTFS_MESSAGE_MAX - <overhead> bytes. If it's
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* larger than that, we need to return an error instead (for
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* correctness).
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*/
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max = GUESTFS_MESSAGE_MAX - 1000;
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buf = NULL;
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size = alloc = 0;
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for (;;) {
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if (size >= alloc) {
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alloc += 8192;
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if (alloc > max) {
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reply_with_error ("cat: %s: file is too large for message buffer",
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path);
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free (buf);
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close (fd);
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return NULL;
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}
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buf2 = realloc (buf, alloc);
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if (buf2 == NULL) {
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reply_with_perror ("realloc");
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free (buf);
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close (fd);
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return NULL;
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}
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buf = buf2;
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}
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r = read (fd, buf + size, alloc - size);
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if (r == -1) {
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reply_with_perror ("read: %s", path);
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free (buf);
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close (fd);
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return NULL;
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}
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if (r == 0) {
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buf[size] = '\0';
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break;
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}
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if (r > 0)
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size += r;
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}
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if (close (fd) == -1) {
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reply_with_perror ("close: %s", path);
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free (buf);
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return NULL;
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}
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return buf; /* caller will free */
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}
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