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/* This file is part of "reprepro"
* Copyright (C) 2006 Bernhard R. Link
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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 St, Fifth Floor, Boston, MA 02111-1301 USA
*/
#include <config.h>
#include <errno.h>
#include <assert.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <archive.h>
#include <archive_entry.h>
#include "error.h"
#include "uncompression.h"
#include "ar.h"
#include "chunks.h"
#include "debfile.h"
#ifndef HAVE_LIBARCHIVE
#error Why did this file got compiled instead of extractcontrol.c?
#endif
#if ARCHIVE_VERSION_NUMBER < 3000000
#define archive_read_free archive_read_finish
#endif
static retvalue read_control_file(char **control, const char *debfile, struct archive *tar, struct archive_entry *entry) {
int64_t size;
char *buffer, *n;
const char *afterchanges;
size_t len, controllen;
ssize_t got;
size = archive_entry_size(entry);
if (size <= 0) {
fprintf(stderr, "Error: Empty control file within %s!\n",
debfile);
return RET_ERROR;
}
if (size > 10*1024*1024) {
fprintf(stderr,
"Error: Ridiculously long control file within %s!\n",
debfile);
return RET_ERROR;
}
buffer = malloc(size + 2);
if (FAILEDTOALLOC(buffer))
return RET_ERROR_OOM;
len = 0;
while ((got = archive_read_data(tar, buffer+len, ((size_t)size+1)-len)) > 0
&& !interrupted()) {
len += got;
if (len > (size_t)size) {
fprintf(stderr,
"Internal Error: libarchive miscalculated length of the control file inside '%s',\n"
" perhaps the file is corrupt, perhaps libarchive!\n", debfile);
free(buffer);
return RET_ERROR;
}
}
if (interrupted()) {
free(buffer);
return RET_ERROR_INTERRUPTED;
}
if (got < 0) {
free(buffer);
fprintf(stderr, "Error reading control file from %s\n",
debfile);
return RET_ERROR;
}
if (len < (size_t)size)
fprintf(stderr,
"Warning: libarchive miscalculated length of the control file inside '%s'.\n"
"Maybe the file is corrupt, perhaps libarchive!\n", debfile);
buffer[len] = '\0';
controllen = chunk_extract(buffer, buffer, len, true, &afterchanges);
if (controllen == 0) {
fprintf(stderr,
"Could only find spaces within control file of '%s'!\n",
debfile);
free(buffer);
return RET_ERROR;
}
if ((size_t)(afterchanges - buffer) < len) {
if (*afterchanges == '\0')
fprintf(stderr,
"Unexpected \\0 character within control file of '%s'!\n", debfile);
else
fprintf(stderr,
"Unexpected data after ending empty line in control file of '%s'!\n", debfile);
free(buffer);
return RET_ERROR;
}
assert (buffer[controllen] == '\0');
n = realloc(buffer, controllen+1);
if (FAILEDTOALLOC(n)) {
free(buffer);
return RET_ERROR_OOM;
}
*control = n;
return RET_OK;
}
static retvalue read_control_tar(char **control, const char *debfile, struct ar_archive *ar, struct archive *tar) {
struct archive_entry *entry;
int a;
retvalue r;
archive_read_support_format_tar(tar);
archive_read_support_format_gnutar(tar);
a = archive_read_open(tar, ar,
ar_archivemember_open,
ar_archivemember_read,
ar_archivemember_close);
if (a != ARCHIVE_OK) {
fprintf(stderr,
"open control.tar.gz within '%s' failed: %d:%d:%s\n",
debfile,
a, archive_errno(tar),
archive_error_string(tar));
return RET_ERROR;
}
while ((a=archive_read_next_header(tar, &entry)) == ARCHIVE_OK) {
if (strcmp(archive_entry_pathname(entry), "./control") != 0 &&
strcmp(archive_entry_pathname(entry), "control") != 0) {
a = archive_read_data_skip(tar);
if (a != ARCHIVE_OK) {
int e = archive_errno(tar);
printf(
"Error skipping %s within data.tar.gz from %s: %d=%s\n",
archive_entry_pathname(entry),
debfile,
e, archive_error_string(tar));
return (e!=0)?(RET_ERRNO(e)):RET_ERROR;
}
if (interrupted())
return RET_ERROR_INTERRUPTED;
} else {
r = read_control_file(control, debfile, tar, entry);
if (r != RET_NOTHING)
return r;
}
}
if (a != ARCHIVE_EOF) {
int e = archive_errno(tar);
printf("Error reading control.tar.gz from %s: %d=%s\n",
debfile,
e, archive_error_string(tar));
return (e!=0)?(RET_ERRNO(e)):RET_ERROR;
}
fprintf(stderr,
"Could not find a control file within control.tar.gz within '%s'!\n",
debfile);
return RET_ERROR_MISSING;
}
retvalue extractcontrol(char **control, const char *debfile) {
struct ar_archive *ar;
retvalue r;
bool hadcandidate = false;
r = ar_open(&ar, debfile);
if (RET_WAS_ERROR(r))
return r;
assert (r != RET_NOTHING);
do {
char *filename;
enum compression c;
r = ar_nextmember(ar, &filename);
if (RET_IS_OK(r)) {
if (strncmp(filename, "control.tar", 11) != 0) {
free(filename);
continue;
}
hadcandidate = true;
for (c = 0 ; c < c_COUNT ; c++) {
if (strcmp(filename + 11,
uncompression_suffix[c]) == 0)
break;
}
if (c >= c_COUNT) {
free(filename);
continue;
}
ar_archivemember_setcompression(ar, c);
if (uncompression_supported(c)) {
struct archive *tar;
tar = archive_read_new();
r = read_control_tar(control, debfile, ar, tar);
// TODO run archive_read_close to get error messages?
archive_read_free(tar);
if (r != RET_NOTHING) {
ar_close(ar);
free(filename);
return r;
}
}
free(filename);
}
} while (RET_IS_OK(r));
ar_close(ar);
if (hadcandidate)
fprintf(stderr,
"Could not find a suitable control.tar file within '%s'!\n", debfile);
else
fprintf(stderr,
"Could not find a control.tar file within '%s'!\n", debfile);
return RET_ERROR_MISSING;
}
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