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/* libguestfs
* Copyright (C) 2010-2012 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; 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 <stdint.h>
#include <inttypes.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <errno.h>
#ifdef HAVE_ENDIAN_H
#include <endian.h>
#endif
#include <pcre.h>
#include "guestfs.h"
#include "guestfs-internal.h"
#if defined(DB_DUMP)
static void read_db_dump_line (guestfs_h *g, void *datav, const char *line, size_t len);
static unsigned char *convert_hex_to_binary (guestfs_h *g, const char *hex, size_t hexlen, size_t *binlen_rtn);
struct cb_data {
guestfs___db_dump_callback callback;
void *opaque;
enum { reading_header,
reading_key, reading_value,
reading_finished,
reading_failed } state;
unsigned char *key;
size_t keylen;
};
/* This helper function is specialized to just reading the hash-format
* output from db_dump/db4_dump. It's just enough to support the RPM
* database format.
*/
int
guestfs___read_db_dump (guestfs_h *g,
const char *dumpfile, void *opaque,
guestfs___db_dump_callback callback)
{
struct cb_data data;
struct command *cmd;
int r;
data.callback = callback;
data.opaque = opaque;
data.state = reading_header;
data.key = NULL;
cmd = guestfs___new_command (g);
guestfs___cmd_add_arg (cmd, DB_DUMP);
guestfs___cmd_add_arg (cmd, "-k");
guestfs___cmd_add_arg (cmd, dumpfile);
guestfs___cmd_set_stdout_callback (cmd, read_db_dump_line, &data, 0);
r = guestfs___cmd_run (cmd);
guestfs___cmd_close (cmd);
free (data.key);
if (r == -1)
return -1;
if (!WIFEXITED (r) || WEXITSTATUS (r) != 0) {
error (g, _("%s: command failed"), DB_DUMP);
return -1;
}
if (data.state != reading_finished) {
error (g, _("%s: unexpected error or end of output"), DB_DUMP);
return -1;
}
return 0;
}
static void
read_db_dump_line (guestfs_h *g, void *datav, const char *line, size_t len)
{
struct cb_data *data = datav;
unsigned char *value;
size_t valuelen;
switch (data->state) {
case reading_finished:
case reading_failed:
return;
case reading_header:
/* Ignore everything to end-of-header marker. */
if (STRPREFIX (line, "HEADER=END"))
data->state = reading_key;
return;
/* Read the key, value pairs using a state machine. They are
* prefixed with a space and printed as hex strings, so convert
* those strings to binary. Pass the strings up to the callback
* function.
*/
case reading_key:
if (STRPREFIX (line, "DATA=END")) {
data->state = reading_finished;
return;
}
if (len < 1 || line[0] != ' ') {
debug (g, _("unexpected line from db_dump command, no space prefix"));
data->state = reading_failed;
return;
}
data->key = convert_hex_to_binary (g, &line[1], len-1, &data->keylen);
if (data->key == NULL) {
data->state = reading_failed;
return;
}
data->state = reading_value;
return;
case reading_value:
if (len < 1 || line[0] != ' ') {
debug (g, _("unexpected line from db_dump command, no space prefix"));
data->state = reading_failed;
return;
}
value = convert_hex_to_binary (g, &line[1], len-1, &valuelen);
if (value == NULL) {
data->state = reading_failed;
return;
}
if (data->callback (g, data->key, data->keylen,
value, valuelen, data->opaque) == -1) {
data->state = reading_failed;
return;
}
free (data->key);
data->key = NULL;
free (value);
value = NULL;
data->state = reading_key;
return;
default:
abort ();
}
}
static int
convert_hex_octet (const char *h)
{
int r;
switch (h[0]) {
case 'a'...'f':
r = (h[0] - 'a' + 10) << 4;
break;
case 'A'...'F':
r = (h[0] - 'A' + 10) << 4;
break;
case '0'...'9':
r = (h[0] - '0') << 4;
break;
default:
return -1;
}
switch (h[1]) {
case 'a'...'f':
r |= h[1] - 'a' + 10;
break;
case 'A'...'F':
r |= h[1] - 'A' + 10;
break;
case '0'...'9':
r |= h[1] - '0';
break;
default:
return -1;
}
return r;
}
static unsigned char *
convert_hex_to_binary (guestfs_h *g, const char *hex, size_t hexlen,
size_t *binlen_rtn)
{
unsigned char *bin;
size_t binlen;
size_t i, o;
int b;
if (hexlen > 0 && hex[hexlen-1] == '\n')
hexlen--;
binlen = hexlen / 2;
bin = safe_malloc (g, binlen);
for (i = o = 0; i+1 < hexlen && o < binlen; i += 2, ++o) {
b = convert_hex_octet (&hex[i]);
if (b >= 0)
bin[o] = b;
else {
error (g, _("unexpected non-hex digits in output of db_dump command"));
free (bin);
return NULL;
}
}
*binlen_rtn = binlen;
return bin;
}
#endif /* defined(DB_DUMP) */
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