mirror of
https://github.com/sheumann/hush.git
synced 2024-08-14 11:28:58 +00:00
(spotted at http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=466771). Add testsuite entry for that, and another one for another bug: we do not list hardlinks in cpio -t (not fixed). function old new delta get_header_cpio 884 909 +25 static.saved_hardlinks_created - 4 +4 static.pending_hardlinks 4 - -4 static.inode 4 - -4 cpio_main 1122 1060 -62
169 lines
4.9 KiB
C
169 lines
4.9 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/* Copyright 2002 Laurence Anderson
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
|
|
#include "libbb.h"
|
|
#include "unarchive.h"
|
|
|
|
typedef struct hardlinks_s {
|
|
struct hardlinks_s *next;
|
|
int inode; /* TODO: must match maj/min too! */
|
|
int mode ;
|
|
int mtime; /* These three are useful only in corner case */
|
|
int uid ; /* of hardlinks with zero size body */
|
|
int gid ;
|
|
char name[1];
|
|
} hardlinks_t;
|
|
|
|
char get_header_cpio(archive_handle_t *archive_handle)
|
|
{
|
|
static hardlinks_t *saved_hardlinks = NULL;
|
|
static hardlinks_t *saved_hardlinks_created = NULL;
|
|
|
|
file_header_t *file_header = archive_handle->file_header;
|
|
char cpio_header[110];
|
|
char dummy[16];
|
|
int namesize;
|
|
int major, minor, nlink, mode, inode;
|
|
unsigned size, uid, gid, mtime;
|
|
|
|
/* There can be padding before archive header */
|
|
data_align(archive_handle, 4);
|
|
|
|
if (archive_xread_all_eof(archive_handle, (unsigned char*)cpio_header, 110) == 0) {
|
|
goto create_hardlinks;
|
|
}
|
|
archive_handle->offset += 110;
|
|
|
|
if (strncmp(&cpio_header[0], "07070", 5) != 0
|
|
|| (cpio_header[5] != '1' && cpio_header[5] != '2')
|
|
) {
|
|
bb_error_msg_and_die("unsupported cpio format, use newc or crc");
|
|
}
|
|
|
|
sscanf(cpio_header + 6,
|
|
"%8x" "%8x" "%8x" "%8x"
|
|
"%8x" "%8x" "%8x" /*maj,min:*/ "%16c"
|
|
/*rmaj,rmin:*/"%8x" "%8x" "%8x" /*chksum:*/ "%8c",
|
|
&inode, &mode, &uid, &gid,
|
|
&nlink, &mtime, &size, dummy,
|
|
&major, &minor, &namesize, dummy);
|
|
file_header->mode = mode;
|
|
file_header->uid = uid;
|
|
file_header->gid = gid;
|
|
file_header->mtime = mtime;
|
|
file_header->size = size;
|
|
|
|
file_header->name = xzalloc(namesize + 1);
|
|
/* Read in filename */
|
|
xread(archive_handle->src_fd, file_header->name, namesize);
|
|
archive_handle->offset += namesize;
|
|
|
|
/* Update offset amount and skip padding before file contents */
|
|
data_align(archive_handle, 4);
|
|
|
|
if (strcmp(file_header->name, "TRAILER!!!") == 0) {
|
|
/* Always round up. ">> 9" divides by 512 */
|
|
printf("%"OFF_FMT"u blocks\n", (archive_handle->offset + 511) >> 9);
|
|
goto create_hardlinks;
|
|
}
|
|
|
|
if (S_ISLNK(file_header->mode)) {
|
|
file_header->link_target = xzalloc(file_header->size + 1);
|
|
xread(archive_handle->src_fd, file_header->link_target, file_header->size);
|
|
archive_handle->offset += file_header->size;
|
|
file_header->size = 0; /* Stop possible seeks in future */
|
|
} else {
|
|
file_header->link_target = NULL;
|
|
}
|
|
|
|
// TODO: data_extract_all can't deal with hardlinks to non-files...
|
|
// (should be !S_ISDIR instead of S_ISREG here)
|
|
|
|
if (nlink > 1 && S_ISREG(file_header->mode)) {
|
|
hardlinks_t *new = xmalloc(sizeof(*new) + namesize);
|
|
new->inode = inode;
|
|
new->mode = mode ;
|
|
new->mtime = mtime;
|
|
new->uid = uid ;
|
|
new->gid = gid ;
|
|
strcpy(new->name, file_header->name);
|
|
/* Put file on a linked list for later */
|
|
if (size == 0) {
|
|
new->next = saved_hardlinks;
|
|
saved_hardlinks = new;
|
|
return EXIT_SUCCESS; /* Skip this one */
|
|
/* TODO: this breaks cpio -t (it does not show hardlinks) */
|
|
}
|
|
new->next = saved_hardlinks_created;
|
|
saved_hardlinks_created = new;
|
|
}
|
|
file_header->device = makedev(major, minor);
|
|
|
|
if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
|
|
archive_handle->action_data(archive_handle);
|
|
archive_handle->action_header(file_header);
|
|
} else {
|
|
data_skip(archive_handle);
|
|
}
|
|
|
|
archive_handle->offset += file_header->size;
|
|
|
|
free(file_header->link_target);
|
|
free(file_header->name);
|
|
file_header->link_target = NULL;
|
|
file_header->name = NULL;
|
|
|
|
return EXIT_SUCCESS;
|
|
|
|
create_hardlinks:
|
|
free(file_header->link_target);
|
|
free(file_header->name);
|
|
|
|
while (saved_hardlinks) {
|
|
hardlinks_t *cur;
|
|
hardlinks_t *make_me = saved_hardlinks;
|
|
saved_hardlinks = make_me->next;
|
|
|
|
memset(file_header, 0, sizeof(*file_header));
|
|
file_header->name = make_me->name;
|
|
file_header->mode = make_me->mode;
|
|
/*file_header->size = 0;*/
|
|
|
|
/* Try to find a file we are hardlinked to */
|
|
cur = saved_hardlinks_created;
|
|
while (cur) {
|
|
/* TODO: must match maj/min too! */
|
|
if (cur->inode == make_me->inode) {
|
|
file_header->link_target = cur->name;
|
|
/* link_target != NULL, size = 0: "I am a hardlink" */
|
|
if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
|
|
archive_handle->action_data(archive_handle);
|
|
free(make_me);
|
|
goto next_link;
|
|
}
|
|
}
|
|
/* Oops... no file with such inode was created... do it now
|
|
* (happens when hardlinked files are empty (zero length)) */
|
|
file_header->mtime = make_me->mtime;
|
|
file_header->uid = make_me->uid ;
|
|
file_header->gid = make_me->gid ;
|
|
if (archive_handle->filter(archive_handle) == EXIT_SUCCESS)
|
|
archive_handle->action_data(archive_handle);
|
|
/* Move to the list of created hardlinked files */
|
|
make_me->next = saved_hardlinks_created;
|
|
saved_hardlinks_created = make_me;
|
|
next_link: ;
|
|
}
|
|
|
|
while (saved_hardlinks_created) {
|
|
hardlinks_t *p = saved_hardlinks_created;
|
|
saved_hardlinks_created = p->next;
|
|
free(p);
|
|
}
|
|
|
|
return EXIT_FAILURE; /* "No more files to process" */
|
|
}
|