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/* libguestfs - the guestfsd daemon
* Copyright (C) 2009 Red Hat Inc.
*
* 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 <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "guestfs_protocol.h"
#include "daemon.h"
#include "actions.h"
GUESTFSD_EXT_CMD(str_zcat, zcat);
GUESTFSD_EXT_CMD(str_cpio, cpio);
char **
do_initrd_list (const char *path)
{
FILE *fp;
char *cmd;
char filename[PATH_MAX];
DECLARE_STRINGSBUF (filenames);
size_t len;
/* "zcat /sysroot/<path> | cpio --quiet -it", but path must be quoted. */
if (asprintf_nowarn (&cmd, "%s %R | %s --quiet -it", str_zcat, path, str_cpio) == -1) {
reply_with_perror ("asprintf");
return NULL;
}
if (verbose)
fprintf (stderr, "%s\n", cmd);
fp = popen (cmd, "r");
if (fp == NULL) {
reply_with_perror ("popen: %s", cmd);
free (cmd);
return NULL;
}
free (cmd);
while (fgets (filename, sizeof filename, fp) != NULL) {
len = strlen (filename);
if (len > 0 && filename[len-1] == '\n')
filename[len-1] = '\0';
if (add_string (&filenames, filename) == -1) {
pclose (fp);
return NULL;
}
}
if (end_stringsbuf (&filenames) == -1) {
pclose (fp);
return NULL;
}
if (pclose (fp) != 0) {
reply_with_perror ("pclose");
free_stringslen (filenames.argv, filenames.size);
return NULL;
}
return filenames.argv;
}
char *
do_initrd_cat (const char *path, const char *filename, size_t *size_r)
{
char tmpdir[] = "/tmp/initrd-cat-XXXXXX";
if (mkdtemp (tmpdir) == NULL) {
reply_with_perror ("mkdtemp");
return NULL;
}
/* "zcat /sysroot/<path> | cpio --quiet -id file", but paths must be quoted */
char *cmd;
if (asprintf_nowarn (&cmd, "cd %Q && zcat %R | cpio --quiet -id %Q",
tmpdir, path, filename) == -1) {
reply_with_perror ("asprintf");
rmdir (tmpdir);
return NULL;
}
/* Extract file into temporary directory. This may create subdirs.
* It's also possible that this doesn't create anything at all
* (eg. if the named file does not exist in the cpio archive) --
* cpio is silent in this case.
*/
int r = system (cmd);
if (r == -1) {
reply_with_perror ("command failed: %s", cmd);
free (cmd);
rmdir (tmpdir);
return NULL;
}
free (cmd);
if (WEXITSTATUS (r) != 0) {
reply_with_perror ("command failed with return code %d",
WEXITSTATUS (r));
rmdir (tmpdir);
return NULL;
}
/* See if we got a file. */
char fullpath[PATH_MAX];
snprintf (fullpath, sizeof fullpath, "%s/%s", tmpdir, filename);
struct stat statbuf;
int fd;
fd = open (fullpath, O_RDONLY|O_CLOEXEC);
if (fd == -1) {
reply_with_perror ("open: %s:%s", path, filename);
rmdir (tmpdir);
return NULL;
}
/* From this point, we know the file exists, so we require full
* cleanup.
*/
char *ret = NULL;
if (fstat (fd, &statbuf) == -1) {
reply_with_perror ("fstat: %s:%s", path, filename);
goto cleanup;
}
/* The actual limit on messages is smaller than this. This
* check just limits the amount of memory we'll try and allocate
* here. If the message is larger than the real limit, that will
* be caught later when we try to serialize the message.
*/
if (statbuf.st_size >= GUESTFS_MESSAGE_MAX) {
reply_with_error ("%s:%s: file is too large for the protocol",
path, filename);
goto cleanup;
}
ret = malloc (statbuf.st_size);
if (ret == NULL) {
reply_with_perror ("malloc");
goto cleanup;
}
if (xread (fd, ret, statbuf.st_size) == -1) {
reply_with_perror ("read: %s:%s", path, filename);
free (ret);
ret = NULL;
goto cleanup;
}
if (close (fd) == -1) {
reply_with_perror ("close: %s:%s", path, filename);
free (ret);
ret = NULL;
goto cleanup;
}
fd = -1;
/* Mustn't touch *size_r until we are sure that we won't return any
* error (RHBZ#589039).
*/
*size_r = statbuf.st_size;
cleanup:
if (fd >= 0)
close (fd);
/* Remove the file. */
if (unlink (fullpath) == -1) {
fprintf (stderr, "unlink: ");
perror (fullpath);
/* non-fatal */
}
/* Remove the directories up to and including the temp directory. */
do {
char *p = strrchr (fullpath, '/');
if (!p) break;
*p = '\0';
if (rmdir (fullpath) == -1) {
fprintf (stderr, "rmdir: ");
perror (fullpath);
/* non-fatal */
}
} while (STRNEQ (fullpath, tmpdir));
return ret;
}
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