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/* archive.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
* Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* 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. See http://www.gnu.org/ for details.
*/
#include <stdio.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <malloc.h>
#include <string.h>
#include <unistd.h>
#include <sysexits.h>
#include <sys/wait.h>
#include "apk_defines.h"
#include "apk_archive.h"
#ifndef GUNZIP_BINARY
#define GUNZIP_BINARY "/bin/gunzip"
#endif
struct tar_header {
/* ustar header, Posix 1003.1 */
char name[100]; /* 0-99 */
char mode[8]; /* 100-107 */
char uid[8]; /* 108-115 */
char gid[8]; /* 116-123 */
char size[12]; /* 124-135 */
char mtime[12]; /* 136-147 */
char chksum[8]; /* 148-155 */
char typeflag; /* 156-156 */
char linkname[100]; /* 157-256 */
char magic[8]; /* 257-264 */
char uname[32]; /* 265-296 */
char gname[32]; /* 297-328 */
char devmajor[8]; /* 329-336 */
char devminor[8]; /* 337-344 */
char prefix[155]; /* 345-499 */
char padding[12]; /* 500-512 */
};
#define GET_OCTAL(s) apk_blob_uint(APK_BLOB_PTR_LEN(s, sizeof(s)), 8)
struct apk_tar_entry_istream {
struct apk_istream is;
struct apk_istream *tar_is;
size_t bytes_left;
};
static size_t tar_entry_read(void *stream, void *ptr, size_t size)
{
struct apk_tar_entry_istream *teis =
container_of(stream, struct apk_tar_entry_istream, is);
if (size > teis->bytes_left)
size = teis->bytes_left;
size = teis->tar_is->read(teis->tar_is, ptr, size);
if (size >= 0)
teis->bytes_left -= size;
return size;
}
static size_t tar_entry_splice(void *stream, int fd, size_t size)
{
struct apk_tar_entry_istream *teis =
container_of(stream, struct apk_tar_entry_istream, is);
if (size > teis->bytes_left)
size = teis->bytes_left;
size = teis->tar_is->splice(teis->tar_is, fd, size);
if (size >= 0)
teis->bytes_left -= size;
return size;
}
int apk_parse_tar(struct apk_istream *is, apk_archive_entry_parser parser,
void *ctx)
{
struct apk_tar_entry_istream teis = {
.is.read = tar_entry_read,
.is.splice = tar_entry_splice,
.tar_is = is,
};
struct apk_archive_entry entry;
struct tar_header buf;
unsigned long offset = 0;
int end = 0, r;
size_t toskip;
memset(&entry, 0, sizeof(entry));
while ((r = is->read(is, &buf, 512)) == 512) {
offset += 512;
if (buf.name[0] == '\0') {
if (end) {
r = 0;
break;
}
end++;
continue;
}
entry = (struct apk_archive_entry){
.size = GET_OCTAL(buf.size),
.uid = GET_OCTAL(buf.uid),
.gid = GET_OCTAL(buf.gid),
.mode = GET_OCTAL(buf.mode) & 07777,
.mtime = GET_OCTAL(buf.mtime),
.name = entry.name,
.uname = buf.uname,
.gname = buf.gname,
.device = makedev(GET_OCTAL(buf.devmajor),
GET_OCTAL(buf.devminor)),
};
switch (buf.typeflag) {
case 'L':
if (entry.name != NULL)
free(entry.name);
entry.name = malloc(entry.size+1);
is->read(is, entry.name, entry.size);
offset += entry.size;
entry.size = 0;
break;
case '0':
case '7': /* regular file */
entry.mode |= S_IFREG;
break;
case '1': /* hard link */
entry.mode |= S_IFREG;
entry.link_target = buf.linkname;
break;
case '2': /* symbolic link */
entry.mode |= S_IFLNK;
entry.link_target = buf.linkname;
break;
case '3': /* char device */
entry.mode |= S_IFCHR;
break;
case '4': /* block devicek */
entry.mode |= S_IFBLK;
break;
case '5': /* directory */
entry.mode |= S_IFDIR;
break;
default:
break;
}
teis.bytes_left = entry.size;
if (entry.mode & S_IFMT) {
if (entry.name == NULL)
entry.name = strdup(buf.name);
/* callback parser function */
r = parser(ctx, &entry, &teis.is);
if (r != 0)
return r;
free(entry.name);
entry.name = NULL;
}
offset += entry.size - teis.bytes_left;
toskip = teis.bytes_left;
if ((offset + toskip) & 511)
toskip += 512 - ((offset + toskip) & 511);
offset += toskip;
if (toskip != 0)
is->read(is, NULL, toskip);
}
if (r != 0) {
apk_error("Bad TAR header (r=%d)", r);
return -1;
}
return 0;
}
int apk_parse_tar_gz(struct apk_bstream *bs, apk_archive_entry_parser parser,
void *ctx)
{
return apk_parse_tar(apk_gunzip_bstream(bs), parser, ctx);
}
int apk_archive_entry_extract(const struct apk_archive_entry *ae,
struct apk_istream *is,
const char *fn)
{
int r = -1, fd;
if (fn == NULL)
fn = ae->name;
/* BIG HONKING FIXME */
unlink(fn);
switch (ae->mode & S_IFMT) {
case S_IFDIR:
r = mkdir(fn, ae->mode & 07777);
if (r < 0 && errno == EEXIST)
r = 0;
break;
case S_IFREG:
if (ae->link_target == NULL) {
fd = open(fn, O_WRONLY | O_CREAT, ae->mode & 07777);
if (fd < 0) {
r = -1;
break;
}
if (is->splice(is, fd, ae->size) == ae->size)
r = 0;
close(fd);
} else {
r = link(ae->link_target, fn);
}
break;
case S_IFLNK:
r = symlink(ae->link_target, fn);
break;
case S_IFSOCK:
case S_IFBLK:
case S_IFCHR:
case S_IFIFO:
r = mknod(fn, ae->mode & 07777, ae->device);
break;
}
if (r == 0) {
if (!S_ISLNK(ae->mode))
r = chown(fn, ae->uid, ae->gid);
else
r = lchown(fn, ae->uid, ae->gid);
if (r < 0)
apk_error("Failed to set ownership on %s: %s", fn,
strerror(errno));
} else {
apk_error("Failed to extract %s\n", ae->name);
}
return r;
}
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