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/* libguestfs - the guestfsd daemon
* Copyright (C) 2009-2012 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 <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "guestfs_protocol.h"
#include "daemon.h"
#include "actions.h"
static const char *
program_of_csum (const char *csumtype)
{
if (STRCASEEQ (csumtype, "crc"))
return "cksum";
else if (STRCASEEQ (csumtype, "md5"))
return "md5sum";
else if (STRCASEEQ (csumtype, "sha1"))
return "sha1sum";
else if (STRCASEEQ (csumtype, "sha224"))
return "sha224sum";
else if (STRCASEEQ (csumtype, "sha256"))
return "sha256sum";
else if (STRCASEEQ (csumtype, "sha384"))
return "sha384sum";
else if (STRCASEEQ (csumtype, "sha512"))
return "sha512sum";
else {
reply_with_error ("unknown checksum type, expecting crc|md5|sha1|sha224|sha256|sha384|sha512");
return NULL;
}
}
static char *
checksum (const char *csumtype, int fd)
{
const char *program;
char *out, *err;
int flags, r;
size_t len;
program = program_of_csum (csumtype);
if (program == NULL) {
close (fd);
return NULL;
}
pulse_mode_start ();
flags = COMMAND_FLAG_CHROOT_COPY_FILE_TO_STDIN | fd;
r = commandf (&out, &err, flags, program, NULL);
if (r == -1) {
pulse_mode_cancel ();
reply_with_error ("%s: %s", program, err);
free (out);
free (err);
return NULL;
}
free (err);
/* Split it at the first whitespace. */
len = strcspn (out, " \t\n");
out[len] = '\0';
pulse_mode_end ();
return out; /* Caller frees. */
}
char *
do_checksum (const char *csumtype, const char *path)
{
int fd;
CHROOT_IN;
fd = open (path, O_RDONLY|O_CLOEXEC);
CHROOT_OUT;
if (fd == -1) {
reply_with_perror ("%s", path);
return NULL;
}
return checksum (csumtype, fd);
}
char *
do_checksum_device (const char *csumtype, const char *device)
{
int fd;
fd = open (device, O_RDONLY|O_CLOEXEC);
if (fd == -1) {
reply_with_perror ("%s", device);
return NULL;
}
return checksum (csumtype, fd);
}
/* Has one FileOut parameter. */
int
do_checksums_out (const char *csumtype, const char *dir)
{
struct stat statbuf;
int r;
const char *program = program_of_csum (csumtype);
if (program == NULL)
return -1;
char *sysrootdir = sysroot_path (dir);
if (!sysrootdir) {
reply_with_perror ("malloc");
return -1;
}
r = stat (sysrootdir, &statbuf);
if (r == -1) {
reply_with_perror ("%s", dir);
free (sysrootdir);
return -1;
}
if (!S_ISDIR (statbuf.st_mode)) {
reply_with_error ("%s: not a directory", dir);
free (sysrootdir);
return -1;
}
char *cmd;
if (asprintf_nowarn (&cmd, "cd %Q && find -type f -print0 | xargs -0 %s",
sysrootdir, program) == -1) {
reply_with_perror ("asprintf");
free (sysrootdir);
return -1;
}
free (sysrootdir);
if (verbose)
fprintf (stderr, "%s\n", cmd);
FILE *fp = popen (cmd, "r");
if (fp == NULL) {
reply_with_perror ("%s", cmd);
free (cmd);
return -1;
}
free (cmd);
/* Now we must send the reply message, before the file contents. After
* this there is no opportunity in the protocol to send any error
* message back. Instead we can only cancel the transfer.
*/
reply (NULL, NULL);
char str[GUESTFS_MAX_CHUNK_SIZE];
while ((r = fread (str, 1, GUESTFS_MAX_CHUNK_SIZE, fp)) > 0) {
if (send_file_write (str, r) < 0) {
pclose (fp);
return -1;
}
}
if (ferror (fp)) {
perror (dir);
send_file_end (1); /* Cancel. */
pclose (fp);
return -1;
}
if (pclose (fp) != 0) {
perror (dir);
send_file_end (1); /* Cancel. */
return -1;
}
if (send_file_end (0)) /* Normal end of file. */
return -1;
return 0;
}
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